EP3086044B1 - Cooking apparatus performing a pyrolytic cleaning cycle and corresponding cleaning method - Google Patents

Cooking apparatus performing a pyrolytic cleaning cycle and corresponding cleaning method Download PDF

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Publication number
EP3086044B1
EP3086044B1 EP16165786.1A EP16165786A EP3086044B1 EP 3086044 B1 EP3086044 B1 EP 3086044B1 EP 16165786 A EP16165786 A EP 16165786A EP 3086044 B1 EP3086044 B1 EP 3086044B1
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EP
European Patent Office
Prior art keywords
temperature
cooking
pyrolysis
cycle
cleaning
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EP16165786.1A
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German (de)
French (fr)
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EP3086044A1 (en
Inventor
Abdelaâziz BOUIRDENE
Laurent GRAPAIN
Sylvain Raimond
Valérie RAMDANE
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Groupe Brandt SAS
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Groupe Brandt SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes

Definitions

  • the present invention relates to a cooking appliance comprising a cavity, such as a cooking oven, implementing a pyrolysis cleaning cycle.
  • the invention also relates to a method of cleaning by pyrolysis.
  • the temperature in the cavity increases progressively from an initial temperature, generally room temperature, to a temperature, called the pyrolysis temperature. Once the cavity reaches the pyrolysis temperature, the temperature is maintained for a predetermined period of time in order to destroy the grease and dirt deposited on the walls forming the cavity.
  • the pyrolysis cycle comprises a first phase in which the temperature of the cavity increases from the initial temperature to the pyrolysis temperature (generally a temperature between 480 ° C and 500 ° C) according to a temperature curve representative of the change in temperature over time and a second phase in which the cavity is maintained at the pyrolysis temperature.
  • the same cooking appliance can implement cleaning cycles by pyrolysis having different durations, depending for example on a selection made by a user.
  • a pyrolysis cleaning cycle lasts approximately 90 to 150 minutes.
  • the duration of the first phase is equal for all cycles and the second phase varies according to the pyrolysis cleaning cycle used, generally according to the degree of soiling of the cavity.
  • the document EP 0 632 232 discloses an oven implementing a pyrolysis cleaning cycle.
  • the pyrolysis cleaning cycle is implemented following a cooking cycle in order to take advantage of the thermal inertia of the cavity being at a temperature high compared to the ambient temperature.
  • the time required for the cavity to reach the pyrolysis temperature is shorter than when the pyrolysis cleaning cycle begins with the cavity. at room temperature.
  • the object of the present invention is to further optimize the duration of a pyrolysis cleaning cycle while obtaining a good cleaning result.
  • the invention aims, according to a first aspect, a cooking appliance comprising a cavity and means for implementing a cleaning cycle by pyrolysis in which the temperature of the cavity increases from an initial temperature to at a pyrolysis temperature, the rise in temperature over time being implemented according to a first temperature curve, representative of the change in temperature over time.
  • the means for implementing a pyrolysis cycle comprise means for verifying the prior implementation of a cooking cycle comprising means for determining the period of time elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle and means for comparing the determined period of time with a predetermined period of time
  • the means for implementing a pyrolysis cycle further comprising comparison means to compare said initial temperature to a predetermined temperature, and are configured to implement the temperature rise over time according to said first temperature curve when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the temperature initial temperature is greater than or substantially equal to the predetermined temperature
  • the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature interval.
  • the pyrolysis cleaning cycle is implemented after the implementation of a cooking cycle and the temperature of the cavity is higher than the predetermined temperature, the temperature rise is faster.
  • the pyrolysis cleaning cycle is therefore shorter than when the cycle starts with a cavity lower than the predetermined temperature, for example room temperature.
  • the pyrolysis cycle time is shortened.
  • the heat is homogeneous throughout the cavity, in particular in the walls surrounding the cavity.
  • the cooking appliance comprising a catalyst for neutralizing the fumes produced in the cavity during the pyrolysis cleaning cycle
  • the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature. up to a catalyst activation temperature, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, said temperature interval corresponding substantially to the second part of the pyrolysis cleaning cycle.
  • the enamel covering the walls forming the cavity being already hot, it is possible to increase the temperature in the cavity quickly without risk of breakage of the enamel.
  • the cooking appliance comprises an extraction fan for extracting the fumes produced in the cavity during the cleaning cycle by pyrolysis, and means for controlling the extraction fan configured to control the operating fan. extraction at a rotational speed, the rotational speed of the extraction fan being a function of the temperature of the cavity.
  • the extraction fan control means are configured to put the extraction fan into operation at a minimum speed of rotation when the cavity is at the initial temperature and to increase the speed of rotation of the extraction fan when the temperature of the cavity increases.
  • the extraction of fumes from the fats burnt during pyrolysis is reduced at the start of the cleaning cycle by pyrolysis.
  • the catalyst is not activated and the fumes are not neutralized. Therefore, thanks to this functionality, the extraction fan starts its operation at a reduced speed of rotation in order to reduce the extraction of fumes while waiting for the catalyst to be active in order to be able to neutralize odors and fumes.
  • the means for implementing a pyrolysis cleaning cycle include heating means configured so that the temperature of the cavity increases according to the first temperature curve or according to the second temperature curve.
  • the means for implementing the pyrolysis cleaning cycle include means for verifying the prior implementation of a cooking cycle and comparison means for comparing the initial temperature with the predetermined temperature.
  • the predetermined temperature is substantially equal to 100 ° C.
  • the initial temperature has a value substantially greater than 100 ° C or equal to 100 ° C, and a prior firing cycle has conferred thermal inertia on the walls of the cavity, the risk of breakage of the enamel covering the walls of the cavity during a rapid rise in the temperature of the cavity is minimized.
  • the means for verifying the prior implementation of a cooking cycle include comparison means for comparing a cooking temperature with a predetermined cooking temperature.
  • the means for implementing a pyrolysis cleaning cycle can implement the temperature rise according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature.
  • the means for verifying the prior implementation of a cooking cycle include means for comparing a cooking time of said cooking cycle with a predetermined cooking time.
  • the means for implementing a pyrolysis cleaning cycle can implement the temperature rise over time according to the second curve when a cooking time is greater than or equal to a cooking time. predetermined.
  • the means for implementing the cleaning cycle by pyrolysis include means for determining the period of time elapsed between the end of said at least one cooking cycle and the start of the cleaning cycle by pyrolysis and means comparing the determined period of time with a predetermined period of time.
  • the cooking appliance thus comprises means configured to check whether the temperature of the cavity, as well as of the walls which surround it, are at a uniform temperature and sufficiently high so that the rise in temperature can be implemented according to the second temperature curve without risk of breakage of the enamel of the walls surrounding the cavity.
  • the means for implementing a pyrolysis cleaning cycle implement the temperature rise according to the second temperature curve when the period of time elapsed between the end of said at least one cooking cycle and the start of the pyrolysis cleaning cycle is less than or substantially equal to a predetermined period.
  • the cooking apparatus is a cooking oven.
  • the present invention relates to a pyrolysis cleaning process for a cooking appliance comprising a cavity and implementing a pyrolysis cleaning cycle in which the temperature of the cavity increases from an initial temperature to a pyrolysis temperature, the temperature rise over time being implemented according to a first temperature curve representative of the change in temperature over time.
  • the method of cleaning by pyrolysis comprises the verification of the prior implementation of a cooking cycle and the comparison of the initial temperature with a predetermined temperature, the verification comprising a step of determining the period of time. elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle, and a step of comparing the determined elapsed period of time with a predetermined period of time, the temperature rise over time being implemented according to said first curve temperature when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the initial temperature is higher or substantially equal to the predetermined temperature, the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature range.
  • the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature to an activation temperature of a catalyst neutralizing the fumes produced in the cavity during the cleaning cycle. by pyrolysis, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, the temperature interval corresponding substantially to the second part of the cleaning cycle by pyrolysis.
  • the pyrolysis cleaning process comprises the control of a fan for extracting the fumes produced in the cavity during the pyrolysis cleaning cycle, at a speed of rotation depending on the temperature of the cavity.
  • control of the extraction fan comprises starting the extraction fan at a minimum speed of rotation when the cavity is at the initial temperature, the speed of rotation of the extraction fan increasing when the temperature of the cavity increases.
  • the pyrolysis cleaning process comprises the operating control of the heating means for a predetermined period of time and at a predetermined power so that the temperature of the cavity increases according to the first temperature curve or the second. temperature curve.
  • the method of cleaning by pyrolysis comprises checking the prior implementation of a cooking cycle and comparing the initial temperature with the predetermined temperature.
  • the temperature rise over time can be implemented according to the second temperature curve when said determined period of time is less than a predetermined period.
  • the verification of the prior implementation of a cooking cycle comprises the comparison of a cooking temperature during the preliminary cooking cycle with a predetermined cooking temperature.
  • the temperature rise over time can be implemented according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature.
  • the verification of the prior implementation of a cooking cycle comprises determining the cooking time of the cooking cycle, and comparing the determined cooking time with a predetermined cooking time.
  • the temperature rise can be implemented according to the second temperature curve when the cooking time is greater than or substantially equal to a predetermined cooking time.
  • the predetermined cooking temperature is substantially equal to 140 °.
  • each cooking cycle having an associated partial cooking time, said cooking times corresponding to the sum of said several partial cooking times when the temperature of the cavity is higher. at the predetermined temperature between the implementation of the cooking cycles.
  • the pyrolysis cleaning process has characteristics and advantages similar to those described above in relation to the cooking appliance.
  • the present invention finds its application in a cooking appliance comprising a cavity, such as a cooking oven or a stove.
  • the figure 1 illustrates a profile drawing of a baking oven 1 having pyrolysis cleaning functionality.
  • the baking oven 1 comprises a cavity 2 formed by a set of walls 2a, 2b, 2c, as well as by the door 3 of the baking oven.
  • the set of walls 2a, 2b, 2c as well as the door 3 of the baking oven 1 forming the cavity 2, constitute the muffle of the baking oven 1.
  • the baking oven 1 further comprises a catalyst 4 having the functionality of neutralizing fumes and odors produced in the cavity 2 during the cleaning cycle by pyrolysis.
  • the catalyst 4 is located in this embodiment on the upper wall 2a.
  • An extraction fan 6 is placed in an exhaust duct 5.
  • the extraction fan 6 makes it possible to extract the fumes produced in the cavity 2 during the cleaning cycle by pyrolysis.
  • the exhaust duct 5 connects the interior of the baking oven 1, in particular the cavity 2, with the exterior.
  • the extraction fan 6 also allows the cooling of certain parts of the cooking 1, ensuring in particular the cooling of the door 3, as well as of the electronic card (not shown) comprising in particular electrical circuits configured to manage the operation of the cooking oven 1.
  • the extraction of fumes generated during the pyrolysis cleaning cycle is carried out by the venturi effect.
  • the air movement sucks in the fumes from the catalyst 4.
  • the fumes and odors pass through the catalyst 4 leading to the exhaust duct 5a, and are then stirred and directed by the exhaust fan 6 towards the exhaust duct 5 which leads them outside the baking oven 1. .
  • the baking oven 1 comprises heating means arranged on the upper part of the cavity 2 and on the lower part of the cavity 2.
  • These heating means comprise in an exemplary embodiment a high resistance 7a and a low resistance 7b.
  • the high resistance 7a is located inside the cavity 2 and the low resistance 7b is located outside the cavity 2. This low resistance 7b heats the lower wall 2c.
  • the high resistance 7a and the low resistance 7b are used in order to heat the cavity 2 during the cooking modes and during the pyrolysis cleaning cycle.
  • the high resistor 7a has a maximum power of 2100 watts and the low resistor 7b has a maximum power of 1200 watts.
  • the baking oven 1 also includes a mixing fan 8 placed in the cavity 2.
  • This mixing fan 8 can be used during the so-called “rotating heat” cooking modes or for certain phases of the pyrolysis cleaning cycle.
  • the mixing fan 8 is here considered to form part of the heating means.
  • the heating means 7a, 7b, 8 are configured so that the temperature of the cavity 2 changes over time according to the first temperature curve temp1 or the second temperature curve temp2.
  • the baking oven 1 further comprises at least one temperature probe (not shown in the figure) for measuring the temperature inside the baking oven 1.
  • the baking oven 1 has a temperature probe located in the upper part of the baking oven 1.
  • the temperature of cavity 2 refers to the temperature at the center of cavity 2.
  • the cooking appliance 1 further comprises control and command means (not shown in the figure) managing the operation of the cooking appliance 1, and in particular the operation of the means used during the implementation of a pyrolysis cleaning cycle.
  • the figure 2 represents a first temperature curve temp1 and a second temperature curve temp2.
  • a temperature curve represents the change in temperature T of cavity 2 over time t during the implementation of a cleaning cycle by pyrolysis.
  • the first temperature curve temp1 represents a rise in temperature T over time t. This temperature curve t emp1 is followed when the cavity 2 is at a temperature below a predetermined temperature. In the example illustrated, the temperature of the cavity 2 is an ambient temperature.
  • the second temperature curve temp2 represents a rise in temperature T over time t when a cooking cycle has been previously implemented and when the pyrolysis cleaning cycle begins, the cavity 2 is at an initial temperature T i greater than the predetermined temperature.
  • this initial temperature T i is around 160 ° C.
  • cleaning is carried out by pyrolysis after a cooking cycle and the predetermined temperature has a value substantially equal to 100 ° C.
  • the value of 100 ° C was defined empirically so that the temperature rise of the muffle benefits from good thermal inertia while minimizing the risk of enamel breakage.
  • the predetermined temperature could have other values.
  • a pyrolysis cleaning cycle comprises a first phase A1, A2 in which the temperature T of the cavity 2 increases progressively from an initial temperature T i to the pyrolysis temperature T p and a second phase B1, B2 in which the temperature T p pyrolysis is maintained.
  • the initial temperature T i is substantially equal to the ambient temperature or external temperature of the cooking oven 1.
  • This ambient temperature can thus vary within a range of values between 15 ° C and 35 ° C and has a typical value of 20 ° C.
  • the initial temperature T i is of course higher than the ambient temperature.
  • the pyrolysis temperature T p has a value between 480 ° and 500 °.
  • the first phase A1, A2 of the cycle by pyrolysis comprises a first part A1i-c, A2i-c in which the temperature of the cavity 2 increases from the initial temperature T i to the activation temperature T c of the catalyst 4, and a second part A1c-p, A2c-p in which the temperature of cavity 2 increases from the activation temperature T c of catalyst 4 to the pyrolysis temperature T p .
  • activation temperature T c of catalyst 4 is understood to mean the temperature above which catalyst 4 is sufficiently hot to catalyze the fumes produced during a cycle of cleaning by pyrolysis.
  • the activation temperature T c of catalyst 4 is between 250 ° C and 350 ° C.
  • pyrolysis temperature T p is understood to mean the temperature at which cavity 2 must be maintained in order to effectively decompose the organic compounds.
  • the pyrolysis temperature T p is arbitrarily defined and is higher than the theoretical temperature from which the decomposition reaction of organic compounds begins.
  • the temperature of the cavity 2 increases over time according to the first temperature curve temp1.
  • the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the first temperature curve temp1.
  • the temperature of the cavity 2 increases from the initial temperature T i to the pyrolysis temperature T p according to the second temperature curve temp2.
  • the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the second temperature curve temp2.
  • the second temperature curve temp2 comprises at least one substantially linear portion temp2 (1) corresponding to a temperature interval I T.
  • the temperature interval I T corresponds substantially to the temperatures at the start and at the end of the second part A1c-p, A2c-p of the pyrolysis cleaning cycle, that is to say that the temperature interval I T corresponds to the interval between the activation temperature T c of catalyst 4 and the pyrolysis temperature T p .
  • the portion temp2 (1) of the second temperature curve temp2 has a slope a2 of a value greater than the value of the slope ⁇ 1 of a portion temp1 (1) of the first temperature curve temp1 corresponding to the same temperature interval I T .
  • the pyrolysis temperature T p is reached more quickly when the temperature rise is implemented according to the second temperature curve temp2.
  • the extraction fan 6 operates at a speed of rotation which is a function of the temperature of the cavity 2.
  • the operation of the extraction fan 6 is controlled by control means (not shown in the figures) of the extraction fan 6.
  • the extraction fan 6 is put into operation at a minimum speed of rotation when the cavity 2 is at the initial temperature T i .
  • control means activate the extraction fan 6 at a higher speed of rotation.
  • the extraction fan 6 operates at a first speed of rotation corresponding to the speed of minimum rotation, and in the second part A1c-p, A2c-p of the first phase A1, A2 of the pyrolysis cleaning cycle, the extraction fan 6 operates at a second speed of rotation which is higher than the speed of minimum rotation.
  • the speed of rotation of the extraction fan 6 increases progressively and proportionally to the increase in the temperature of the cavity 2 from the initial temperature T i to the pyrolysis temperature T p .
  • the speed of rotation of the exhaust fan 6 can increase in stages or linearly.
  • the speed of rotation of the extraction fan 6 has a minimum value when the temperature is lower than a predefined temperature, for example of a value substantially equal to 200 ° C.
  • extraction fan 6 must operate at a minimum speed in order to ensure its cooling function.
  • the speed of rotation can increase linearly when the temperature increases between the first predefined temperature and the pyrolysis temperature T p (approximately 500 ° C.).
  • the speed of rotation of the extraction fan is 45% of its maximum rotational speed and increases linearly until cavity 2 has a temperature substantially lower than the pyrolysis temperature T p , for example 494 ° C, the rotational speed is then 76% of its maximum rotational speed.
  • the speed of rotation of the extraction fan 6 operates at its maximum speed of rotation.
  • the baking oven 1 further comprises means for verifying the prior implementation of a baking cycle and comparison means (not shown in the figures) for comparing the initial temperature T i of the cavity 2 at the predetermined temperature.
  • the means for verifying the prior implementation of a cooking cycle include comparison means (not shown) for comparing a cooking temperature T u of the preliminary cooking cycle, with a predetermined cooking temperature.
  • the predetermined cooking temperature T u has, for example, a value of 140 ° C.
  • This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.
  • the baking oven 1 further comprises storage means in which the baking temperature T u in a baking cycle is stored.
  • the stored cooking temperature T u can be the setpoint temperature for the cooking cycle.
  • the stored cooking temperature T u can be the temperature measured during the cooking cycle.
  • the means for verifying the prior implementation of a cooking cycle comprise means for determining the cooking time and means for determining the period of time elapsed between the end of a cooking cycle and the start of a pyrolysis cleaning cycle, as well as means for comparing the cooking time with a predetermined cooking time and means for comparing said determined period of time with a period of predetermined time.
  • the heating means are configured so that the temperature of the cavity 2 follows a temperature curve temp1, temp2 over time t .
  • the temperature rise of the cavity 2 is implemented according to said temperature curve.
  • the heating means comprise in particular the high resistance 7a, the low resistance 7b and the mixing fan 8.
  • the heating means 7a, 7b, 8 are controlled in operation so that the temperature in the cavity 2 increases in time t according to the second temperature curve temp2.
  • the high resistor 7a is supplied at 83% of its maximum power (here 1750 watts).
  • the high resistor 7a is supplied at full power, that is to say at 100% of its power (2100 watts in this example)
  • the low resistor 7b is supplied at 80% of its power (here 960 watts) and the brewing fan 8 is activated.
  • control means managing the operation of the oven control the maintaining the temperature of the cavity 2 at the pyrolysis temperature T p (for example 492 °).
  • the means of heating 7a, 7b, 8 are controlled in operation so that the temperature of cavity 2 increases in time t according to the first temperature curve temp1.
  • the heating means 7a, 7b, 8 are put into operation as follows.
  • the high resistance 7a is supplied to 83% of its maximum power (here 1750 watts).
  • the high resistor 7a is activated at 100% of its maximum power (for example 2100 watts) for a first predefined period then deactivated for a second predefined period the first predefined period has a value of 50 seconds and the second preset period has a value of 10 seconds.
  • the high resistance 7a is activated periodically every 50 seconds out of 60 seconds, which allows an average power supply at 83% of its maximum power.
  • the second part A1c-p of the first phase A1 of the pyrolysis cleaning cycle is divided into three partial phases.
  • the high resistance 7a operates, as for the first part A1ic of the first phase A1, at 83% of its maximum power and the low resistor 7b is operating at 33% of its maximum power, for example by operating at full power periodically for 20 seconds out of 60 seconds.
  • the high resistance 7a is activated at 80%, for example by feeding it. at full power periodically for 48 seconds out of 60 seconds and the low resistance 7b is activated at full power (here 1200 watts)
  • the high resistor 7a is put into operation at full power
  • the low resistor 7b is put into operation at full power periodically for 48 seconds out of 60 seconds (i.e. 80% of its maximum power)
  • the circulation fan 8 is activated.
  • the control means managing the operation of the baking oven 1 control the maintenance of the temperature of the cavity 2 at the pyrolysis temperature T p , for example at 492 ° C.
  • the predefined periods of activation of the heating means 7a, 7b, 8, as well as the heating powers may be different in order to be able to reproduce the temperature curves temp1, temp2.
  • the figure 3 represents an embodiment of a pyrolysis cleaning process according to the invention.
  • the pyrolysis cleaning process implemented in a cooking appliance 1, such as a cooking oven such as that shown in FIG. figure 1 includes a step of verifying the prior implementation of a cooking cycle E1.
  • the pyrolysis cleaning process further comprises a step of comparison E2 of the initial temperature T i of the cavity 2 with a predetermined temperature.
  • the predetermined temperature has a value of 100 ° C.
  • This value of 100 ° C was determined empirically so that the rise in temperature takes advantage of the thermal inertia of the muffle, and can, of course, have other different values.
  • the rise in temperature is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the second temperature curve temp2 .
  • the verification E1 of the prior implementation of a cooking cycle comprises a step of comparison E3 of a cooking temperature T u with a predetermined cooking temperature.
  • This cooking temperature T u corresponds to the cooking temperature of the cooking cycle prior to the pyrolysis cleaning cycle.
  • the cooking temperature T u can for example be set by a user of the cooking oven 1 by means of a man-machine interface comprising control devices and displays or can be automatically defined by a computer in a specific cooking mode. .
  • the predetermined cooking temperature has, for example, a value of 140 ° C.
  • This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature of the cavity 2 does not have a sufficient value for the temperature rise during the pyrolysis cleaning cycle to take advantage of thermal inertia.
  • the temperature rise over time is implemented according to the second curve temperature temp2.
  • the verification E1 of the prior implementation of a cooking cycle comprises a step of determining the cooking time of the cooking cycle implemented prior to the pyrolysis cleaning cycle, as well as a comparison step E4 of the determined cooking time with a predetermined cooking time t c .
  • the temperature rise is implemented according to the second temperature curve temp2.
  • the cooking temperature T u is at least 140 ° C.
  • determining the cooking time is equivalent to determining the time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature (here of 140 ° C.).
  • the temperature is implemented according to the first temperature curve temp1.
  • the predetermined cooking time t c is 25 min.
  • the baking time has been determined empirically so that the cavity 2 of the baking oven 1 operated at a baking temperature T u of at least 140 ° C has thermal inertia when the temperature rise follows the second curve temperature temp2.
  • the predetermined cooking time t c can be made up of several partial cooking times associated with different cooking cycles implemented for a period less than the predetermined cooking time t c .
  • the temperature of the cavity 2 between cooking cycles must not drop from the predetermined temperature (here by 100 ° C).
  • these 15 min cooking times form a single cooking time when the temperature of cavity 2 is above the predetermined temperature during and between the implementation of the three cooking cycles.
  • step E1 it is verified that a cooking cycle has been implemented at a minimum cooking temperature and / or during a minimum cooking time in order to benefit from the thermal inertia of the mitten.
  • comparison steps E2, E3, E4 can be implemented in the aforementioned order, or in any other order.
  • the cleaning method can be implemented according to several embodiments.
  • the method of cleaning by pyrolysis comprises the step of comparing an initial temperature T i with the predetermined temperature E2 as well as the step E3 of comparing the cooking temperature T u with the cooking temperature predetermined.
  • it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, the step E3 of comparing the cooking temperature T u with the predetermined cooking temperature, and the comparison step E4 of the cooking time with the predetermined cooking time t c .
  • it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, and the step E4 of comparing the cooking time with the predetermined cooking time t c .
  • the method of cleaning by pyrolysis may further comprise a step of determining (not shown) the period of time elapsed between the end of a cooking cycle and the start of a cycle of cleaning by pyrolysis, as well as a step comparing this determined elapsed time period with a predetermined time period.
  • the temperature rise is implemented according to the second temperature curve temp2.
  • the temperature rise is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1.
  • the temperature rise over time is implemented according to the first temperature curve temp1 .
  • the pyrolysis cleaning process comprises the step of checking the cooking temperature T u with the predetermined cooking temperature, when the cooking temperature T u is lower than the predetermined cooking temperature, the temperature rise over time is implemented according to the first temperature curve temp1.
  • the pyrolysis cleaning process may further include a cooking time check, and includes checking the time period between the end of a cooking cycle and the start of a pyrolysis cleaning cycle.
  • the cooking temperature in a cooking cycle is at least 140 ° C.
  • the cooking time is equivalent to the cooking time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature.
  • the temperature rise is implemented according to the first temperature curve temp1.
  • the initial temperature T i of the cavity 2 is greater than or substantially equal to the predetermined temperature and that the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature and / or that the cooking time is greater than or substantially equal to the predetermined cooking time t c
  • the temperature rise over time is implemented according to the second temperature curve time 2.

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
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Description

La présente invention concerne un appareil de cuisson comportant une cavité, tel qu'un four de cuisson, mettant en œuvre un cycle de nettoyage par pyrolyse.The present invention relates to a cooking appliance comprising a cavity, such as a cooking oven, implementing a pyrolysis cleaning cycle.

L'invention concerne également un procédé de nettoyage par pyrolyse.The invention also relates to a method of cleaning by pyrolysis.

Lors de la mise en œuvre d'un cycle de nettoyage par pyrolyse, la température dans la cavité augmente progressivement depuis une température initiale, en général la température ambiante, jusqu'à une température, nommée température de pyrolyse. Une fois que la cavité atteint la température de pyrolyse, la température est maintenue pendant une période de temps prédéterminée afin de détruire les graisses et les salissures déposées sur des parois formant la cavité.During the implementation of a cleaning cycle by pyrolysis, the temperature in the cavity increases progressively from an initial temperature, generally room temperature, to a temperature, called the pyrolysis temperature. Once the cavity reaches the pyrolysis temperature, the temperature is maintained for a predetermined period of time in order to destroy the grease and dirt deposited on the walls forming the cavity.

Ainsi, le cycle de pyrolyse comporte une première phase dans laquelle la température de la cavité augmente depuis la température initiale jusqu'à la température de pyrolyse (en général une température entre 480°C et 500°C) selon une courbe de température représentative de l'évolution de la température dans le temps et une seconde phase dans laquelle la cavité est maintenue à la température de pyrolyse.Thus, the pyrolysis cycle comprises a first phase in which the temperature of the cavity increases from the initial temperature to the pyrolysis temperature (generally a temperature between 480 ° C and 500 ° C) according to a temperature curve representative of the change in temperature over time and a second phase in which the cavity is maintained at the pyrolysis temperature.

Un même appareil de cuisson peut mettre en œuvre des cycles de nettoyage par pyrolyse ayant des durées différentes, en fonction par exemple d'une sélection réalisée par un utilisateur.The same cooking appliance can implement cleaning cycles by pyrolysis having different durations, depending for example on a selection made by a user.

Le temps nécessaire pour la mise en œuvre d'un cycle de nettoyage par pyrolyse est préfixé.The time required for the implementation of a pyrolysis cleaning cycle is fixed.

A titre illustratif, un cycle de nettoyage par pyrolyse a une durée approximative de 90 à 150 minutes.By way of illustration, a pyrolysis cleaning cycle lasts approximately 90 to 150 minutes.

Dans ces cycles de nettoyage par pyrolyse de durée différente, la durée de la première phase est égale pour tous les cycles et la seconde phase varie en fonction du cycle de nettoyage par pyrolyse mis en œuvre, généralement en fonction du degré de salissure de la cavité.In these pyrolysis cleaning cycles of different duration, the duration of the first phase is equal for all cycles and the second phase varies according to the pyrolysis cleaning cycle used, generally according to the degree of soiling of the cavity.

Le document EP 0 632 232 divulgue un four mettant en œuvre un cycle de nettoyage par pyrolyse.The document EP 0 632 232 discloses an oven implementing a pyrolysis cleaning cycle.

Dans ce document, le cycle de nettoyage par pyrolyse est mis en œuvre à la suite d'un cycle de cuisson afin de tirer bénéfice de l'inertie thermique de la cavité se trouvant à une température élevée par rapport à la température ambiante.In this document, the pyrolysis cleaning cycle is implemented following a cooking cycle in order to take advantage of the thermal inertia of the cavity being at a temperature high compared to the ambient temperature.

Naturellement, lorsque le cycle de nettoyage par pyrolyse est mis en œuvre à la suite d'un cycle de cuisson, le temps nécessaire pour que la cavité atteigne la température de pyrolyse est plus court que lorsque le cycle de nettoyage par pyrolyse débute avec la cavité à température ambiante.Naturally, when the pyrolysis cleaning cycle is carried out following a cooking cycle, the time required for the cavity to reach the pyrolysis temperature is shorter than when the pyrolysis cleaning cycle begins with the cavity. at room temperature.

Les documents EP 0878667 A2 , US 6232584 B1 , DE 3700136 A1 et US 5286943 dévoilent par ailleurs des appareils de cuisson comprenant différentes formes d'optimisation du cycle de nettoyage par pyrolyse.The documents EP 0878667 A2 , US 6232584 B1 , DE 3700136 A1 and US 5,286,943 also unveil cooking appliances comprising different forms of optimization of the pyrolysis cleaning cycle.

La présente invention a pour but d'optimiser davantage la durée d'un cycle de nettoyage par pyrolyse tout en obtenant un bon résultat de nettoyage.The object of the present invention is to further optimize the duration of a pyrolysis cleaning cycle while obtaining a good cleaning result.

A cet effet, l'invention vise, selon un premier aspect, un appareil de cuisson comportant une cavité et des moyens de mise en œuvre d'un cycle de nettoyage par pyrolyse dans lequel la température de la cavité augmente depuis une température initiale jusqu'à une température de pyrolyse, la montée de température dans le temps étant mise en œuvre selon une première courbe de température, représentative de l'évolution de la température dans le temps.To this end, the invention aims, according to a first aspect, a cooking appliance comprising a cavity and means for implementing a cleaning cycle by pyrolysis in which the temperature of the cavity increases from an initial temperature to at a pyrolysis temperature, the rise in temperature over time being implemented according to a first temperature curve, representative of the change in temperature over time.

Selon l'invention, les moyens de mise en œuvre d'un cycle de pyrolyse comportent des moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson comportant des moyens de détermination de la période de temps écoulée entre la fin d'un cycle de cuisson et le début du cycle de nettoyage par pyrolyse et des moyens de comparaison de la période de temps déterminée avec une période de temps prédéterminée, les moyens de mise en œuvre d'un cycle de pyrolyse comportant en outre des moyens de comparaison pour comparer ladite température initiale à une température prédéterminée, et sont configurés pour mettre en œuvre la montée de température dans le temps selon ladite première courbe de température lorsque la température initiale est inférieure à la température prédéterminée et selon une seconde courbe de température représentative de l'évolution de la température dans le temps lorsqu'un cycle de cuisson a été préalablement mis en œuvre et que la température initiale est supérieure ou sensiblement égale à la température prédéterminée, la seconde courbe de température comprenant au moins une portion sensiblement linéaire correspondant à un intervalle de températures, la portion ayant une pente de valeur supérieure à la valeur de la pente d'une portion de la première courbe de température correspondant à l'intervalle de températures.According to the invention, the means for implementing a pyrolysis cycle comprise means for verifying the prior implementation of a cooking cycle comprising means for determining the period of time elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle and means for comparing the determined period of time with a predetermined period of time, the means for implementing a pyrolysis cycle further comprising comparison means to compare said initial temperature to a predetermined temperature, and are configured to implement the temperature rise over time according to said first temperature curve when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the temperature initial temperature is greater than or substantially equal to the predetermined temperature, the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature interval.

Ainsi, lorsque le cycle de nettoyage par pyrolyse est mis en œuvre après la mise en œuvre d'un cycle de cuisson et que la température de la cavité est supérieure à la température prédéterminée, la montée en température est plus rapide. Le cycle de nettoyage par pyrolyse est par conséquent plus court que lorsque le cycle débute avec une cavité inférieure à la température prédéterminée, par exemple la température ambiante.Thus, when the pyrolysis cleaning cycle is implemented after the implementation of a cooking cycle and the temperature of the cavity is higher than the predetermined temperature, the temperature rise is faster. The pyrolysis cleaning cycle is therefore shorter than when the cycle starts with a cavity lower than the predetermined temperature, for example room temperature.

Par conséquent, lorsqu'un utilisateur commande un cycle de nettoyage par pyrolyse une fois qu'un cycle de cuisson est fini et que la cavité se trouve à une température supérieure à la température prédéterminée, la durée du cycle de pyrolyse est raccourcie.Therefore, when a user commands a pyrolysis cleaning cycle after a cooking cycle is finished and the cavity is at a temperature above the predetermined temperature, the pyrolysis cycle time is shortened.

Ainsi, dans un tel cas, la montée en température dans le temps de la cavité étant plus rapide, la consommation d'énergie est inférieure et l'appareil de cuisson est rendu disponible plus rapidement pour être utilisé.Thus, in such a case, the rise in temperature over time of the cavity being faster, the energy consumption is lower and the cooking appliance is made available more quickly for use.

Par ailleurs, la chaleur est homogène dans l'ensemble de la cavité, en particulier dans les parois entourant la cavité.Furthermore, the heat is homogeneous throughout the cavity, in particular in the walls surrounding the cavity.

En outre, grâce à l'inertie thermique de la cavité, la consommation d'énergie est davantage réduite.In addition, thanks to the thermal inertia of the cavity, energy consumption is further reduced.

Selon une caractéristique, l'appareil de cuisson comportant un catalyseur pour neutraliser les fumées produites dans la cavité pendant le cycle de nettoyage par pyrolyse, le cycle de nettoyage par pyrolyse comporte une première partie dans laquelle la température de la cavité augmente depuis la température initiale jusqu'à une température d'activation du catalyseur, et une seconde partie dans laquelle la température augmente depuis la température d'activation du catalyseur jusqu'à la température de pyrolyse, ledit intervalle de températures correspondant sensiblement à la seconde partie du cycle de nettoyage par pyrolyse.According to one characteristic, the cooking appliance comprising a catalyst for neutralizing the fumes produced in the cavity during the pyrolysis cleaning cycle, the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature. up to a catalyst activation temperature, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, said temperature interval corresponding substantially to the second part of the pyrolysis cleaning cycle.

Ainsi, la montée rapide de température de la cavité est mise en œuvre une fois que le catalyseur est activé, les odeurs et les fumées produites dans la cavité du four étant neutralisées.Thus, the rapid rise in temperature of the cavity is implemented once the catalyst is activated, the odors and fumes produced in the oven cavity being neutralized.

En outre, l'émail recouvrant les parois formant la cavité étant déjà chaud, il est possible de monter la température dans la cavité rapidement sans risque de casse de l'émail.In addition, the enamel covering the walls forming the cavity being already hot, it is possible to increase the temperature in the cavity quickly without risk of breakage of the enamel.

Selon une autre caractéristique, l'appareil de cuisson comporte un ventilateur d'extraction pour extraire les fumées produites dans la cavité pendant le cycle de nettoyage par pyrolyse, et des moyens de commande du ventilateur d'extraction configurés pour commander en fonctionnement le ventilateur d'extraction à une vitesse de rotation, la vitesse de rotation du ventilateur d'extraction étant fonction de la température de la cavité.According to another characteristic, the cooking appliance comprises an extraction fan for extracting the fumes produced in the cavity during the cleaning cycle by pyrolysis, and means for controlling the extraction fan configured to control the operating fan. extraction at a rotational speed, the rotational speed of the extraction fan being a function of the temperature of the cavity.

Avantageusement, les moyens de commande du ventilateur d'extraction sont configurés pour mettre en fonctionnement le ventilateur d'extraction à une vitesse minimale de rotation lorsque la cavité se trouve à la température initiale et pour augmenter la vitesse de rotation du ventilateur d'extraction lorsque la température de la cavité augmente.Advantageously, the extraction fan control means are configured to put the extraction fan into operation at a minimum speed of rotation when the cavity is at the initial temperature and to increase the speed of rotation of the extraction fan when the temperature of the cavity increases.

Ainsi, l'extraction des fumées provenant des graisses brulées lors de la pyrolyse est diminuée en début du cycle de nettoyage par pyrolyse. En début du cycle de nettoyage par pyrolyse, le catalyseur n'est pas activé et les fumées ne sont pas neutralisées. Par conséquent, grâce à cette fonctionnalité, le ventilateur d'extraction débute son fonctionnement à une vitesse de rotation réduite afin de diminuer l'extraction de fumées en attendant que le catalyseur soit actif pour pouvoir neutraliser les odeurs et les fumées.Thus, the extraction of fumes from the fats burnt during pyrolysis is reduced at the start of the cleaning cycle by pyrolysis. At the start of the pyrolysis cleaning cycle, the catalyst is not activated and the fumes are not neutralized. Therefore, thanks to this functionality, the extraction fan starts its operation at a reduced speed of rotation in order to reduce the extraction of fumes while waiting for the catalyst to be active in order to be able to neutralize odors and fumes.

En outre, dans un cas d'une mise en œuvre d'un cycle de nettoyage par pyrolyse à la suite d'un cycle de cuisson, l'extraction de fumées désagréables engendrées par la vaporisation des graisses qui ont déjà été chauffées pendant le cycle de cuisson sont évitées.In addition, in a case of an implementation of a cleaning cycle by pyrolysis following a cooking cycle, the extraction of unpleasant fumes generated by the vaporization of the fats which have already been heated during the cycle cooking are avoided.

Selon une caractéristique, les moyens de mise en œuvre d'un cycle de nettoyage par pyrolyse comportent des moyens de chauffage configurés de façon à ce que la température de la cavité augmente selon la première courbe de température ou selon la seconde courbe de température.According to one characteristic, the means for implementing a pyrolysis cleaning cycle include heating means configured so that the temperature of the cavity increases according to the first temperature curve or according to the second temperature curve.

Selon l'invention, les moyens de mise en œuvre du cycle de nettoyage par pyrolyse comportent des moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson et des moyens de comparaison pour comparer la température initiale à la température prédéterminée.According to the invention, the means for implementing the pyrolysis cleaning cycle include means for verifying the prior implementation of a cooking cycle and comparison means for comparing the initial temperature with the predetermined temperature.

Dans un mode de réalisation, la température prédéterminée est sensiblement égale à 100°C.In one embodiment, the predetermined temperature is substantially equal to 100 ° C.

Lorsque la température initiale présente une valeur sensiblement supérieure à 100°C ou égale à 100°C, et qu'un cycle préalable de cuisson a conféré une inertie thermique aux parois de la cavité, le risque de casse de l'émail recouvrant les parois de la cavité lors d'une montée rapide de la température de la cavité est minimisé.When the initial temperature has a value substantially greater than 100 ° C or equal to 100 ° C, and a prior firing cycle has conferred thermal inertia on the walls of the cavity, the risk of breakage of the enamel covering the walls of the cavity during a rapid rise in the temperature of the cavity is minimized.

Selon une autre caractéristique, les moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson comportent des moyens de comparaison pour comparer une température de cuisson à une température de cuisson prédéterminée.According to another characteristic, the means for verifying the prior implementation of a cooking cycle include comparison means for comparing a cooking temperature with a predetermined cooking temperature.

Dans un mode de réalisation, les moyens de mise en œuvre d'un cycle de nettoyage par pyrolyse peuvent mettre en œuvre la montée de température selon la seconde courbe de température lorsque la température de cuisson est supérieure ou sensiblement égale à la température de cuisson prédéterminée.In one embodiment, the means for implementing a pyrolysis cleaning cycle can implement the temperature rise according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature. .

Selon une caractéristique, les moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson comportent des moyens de comparaison d'un temps de cuisson dudit cycle de cuisson avec un temps de cuisson prédéterminé.According to one characteristic, the means for verifying the prior implementation of a cooking cycle include means for comparing a cooking time of said cooking cycle with a predetermined cooking time.

Dans un mode de réalisation, les moyens de mise en œuvre d'un cycle de nettoyage par pyrolyse peuvent mettre en œuvre la montée de température dans le temps selon la seconde courbe lorsqu'un temps de cuisson est supérieur ou égal à un temps de cuisson prédéterminé.In one embodiment, the means for implementing a pyrolysis cleaning cycle can implement the temperature rise over time according to the second curve when a cooking time is greater than or equal to a cooking time. predetermined.

Selon l'invention, les moyens de mise en œuvre du cycle de nettoyage par pyrolyse comportent des moyens de détermination de la période de temps écoulé entre la fin dudit au moins un cycle de cuisson et le début du cycle de nettoyage par pyrolyse et des moyens de comparaison de la période de temps déterminée avec une période de temps prédéterminé.According to the invention, the means for implementing the cleaning cycle by pyrolysis include means for determining the period of time elapsed between the end of said at least one cooking cycle and the start of the cleaning cycle by pyrolysis and means comparing the determined period of time with a predetermined period of time.

L'appareil de cuisson comporte ainsi des moyens configurés pour vérifier si la température de la cavité, ainsi que des parois qui l'entourent se trouvent à une température homogène et suffisamment élevée pour que la montée de température puisse être mise en œuvre selon la seconde courbe de température sans risque de casse de l'email des parois entourant la cavité.The cooking appliance thus comprises means configured to check whether the temperature of the cavity, as well as of the walls which surround it, are at a uniform temperature and sufficiently high so that the rise in temperature can be implemented according to the second temperature curve without risk of breakage of the enamel of the walls surrounding the cavity.

Dans un mode de réalisation, les moyens de mise en œuvre d'un cycle de nettoyage par pyrolyse mettent en œuvre la montée de température selon la seconde courbe de température lorsque la période de temps écoulée entre la fin dudit au moins un cycle de cuisson et le début du cycle de nettoyage par pyrolyse est inférieure ou sensiblement égale à une période prédéterminée.In one embodiment, the means for implementing a pyrolysis cleaning cycle implement the temperature rise according to the second temperature curve when the period of time elapsed between the end of said at least one cooking cycle and the start of the pyrolysis cleaning cycle is less than or substantially equal to a predetermined period.

Dans un mode de réalisation, l'appareil de cuisson est un four de cuisson.In one embodiment, the cooking apparatus is a cooking oven.

La présente invention concerne, un procédé de nettoyage par pyrolyse pour un appareil de cuisson comportant une cavité et mettant en œuvre un cycle de nettoyage par pyrolyse dans lequel la température de la cavité augmente depuis une température initiale jusqu'à une température de pyrolyse, la montée de température dans le temps étant mise en œuvre selon une première courbe de température représentative de l'évolution de la température dans le temps.The present invention relates to a pyrolysis cleaning process for a cooking appliance comprising a cavity and implementing a pyrolysis cleaning cycle in which the temperature of the cavity increases from an initial temperature to a pyrolysis temperature, the temperature rise over time being implemented according to a first temperature curve representative of the change in temperature over time.

Selon l'invention, le procédé de nettoyage par pyrolyse comporte la vérification de la mise en œuvre préalable d'un cycle de cuisson et la comparaison de la température initiale à une température prédéterminée, la vérification comportant une étape de détermination de la période de temps écoulée entre la fin d'un cycle de cuisson et le début du cycle de nettoyage par pyrolyse, et une étape de comparaison de la période de temps écoulée déterminée avec une période de temps prédéterminée, la montée de température dans le temps étant mise en œuvre selon ladite première courbe de température lorsque la température initiale est inférieure à la température prédéterminée et selon une seconde courbe de température représentative de l'évolution de la température dans le temps lorsqu'un cycle de cuisson a été préalablement mis en œuvre et que la température initiale est supérieure ou sensiblement égale à la température prédéterminée, la seconde courbe de température comprenant au moins une portion sensiblement linéaire correspondant à un intervalle de températures, la portion ayant une pente de valeur supérieure à la valeur de la pente d'une portion de la première courbe de température correspondant à l'intervalle de températures.According to the invention, the method of cleaning by pyrolysis comprises the verification of the prior implementation of a cooking cycle and the comparison of the initial temperature with a predetermined temperature, the verification comprising a step of determining the period of time. elapsed between the end of a cooking cycle and the start of the pyrolysis cleaning cycle, and a step of comparing the determined elapsed period of time with a predetermined period of time, the temperature rise over time being implemented according to said first curve temperature when the initial temperature is lower than the predetermined temperature and according to a second temperature curve representative of the evolution of the temperature over time when a cooking cycle has been implemented beforehand and the initial temperature is higher or substantially equal to the predetermined temperature, the second temperature curve comprising at least one substantially linear portion corresponding to a temperature interval, the portion having a slope of value greater than the value of the slope of a portion of the first temperature curve corresponding to the temperature range.

Selon une caractéristique, le cycle de nettoyage par pyrolyse comporte une première partie dans laquelle la température de la cavité augmente depuis la température initiale jusqu'à une température d'activation d'un catalyseur neutralisant les fumées produites dans la cavité pendant le cycle de nettoyage par pyrolyse, et une seconde partie dans laquelle la température augmente depuis la température d'activation du catalyseur jusqu'à la température de pyrolyse, l'intervalle de températures correspondant sensiblement à la seconde partie du cycle de nettoyage par pyrolyse.According to one characteristic, the pyrolysis cleaning cycle comprises a first part in which the temperature of the cavity increases from the initial temperature to an activation temperature of a catalyst neutralizing the fumes produced in the cavity during the cleaning cycle. by pyrolysis, and a second part in which the temperature increases from the activation temperature of the catalyst to the pyrolysis temperature, the temperature interval corresponding substantially to the second part of the cleaning cycle by pyrolysis.

Selon une autre caractéristique, le procédé de nettoyage par pyrolyse comporte la commande d'un ventilateur d'extraction des fumées produites dans la cavité pendant le cycle de nettoyage par pyrolyse, à une vitesse de rotation étant fonction de la température de la cavité.According to another characteristic, the pyrolysis cleaning process comprises the control of a fan for extracting the fumes produced in the cavity during the pyrolysis cleaning cycle, at a speed of rotation depending on the temperature of the cavity.

En pratique, la commande du ventilateur d'extraction comporte la mise en fonctionnement du ventilateur d'extraction à une vitesse minimale de rotation lorsque la cavité se trouve à la température initiale, la vitesse de rotation du ventilateur d'extraction augmentant lorsque la température de la cavité augmente.In practice, the control of the extraction fan comprises starting the extraction fan at a minimum speed of rotation when the cavity is at the initial temperature, the speed of rotation of the extraction fan increasing when the temperature of the cavity increases.

Selon une caractéristique, le procédé de nettoyage par pyrolyse comporte la commande en fonctionnement des moyens de chauffage pendant une période de temps prédéterminée et à une puissance prédéterminée de façon à ce que la température de la cavité augmente selon la première courbe de température ou la seconde courbe de température.According to one characteristic, the pyrolysis cleaning process comprises the operating control of the heating means for a predetermined period of time and at a predetermined power so that the temperature of the cavity increases according to the first temperature curve or the second. temperature curve.

Selon l'invention, le procédé de nettoyage par pyrolyse comporte la vérification de la mise en œuvre préalable d'un cycle de cuisson et la comparaison de la température initiale à la température prédéterminée.According to the invention, the method of cleaning by pyrolysis comprises checking the prior implementation of a cooking cycle and comparing the initial temperature with the predetermined temperature.

Selon une autre caractéristique, la montée de température dans le temps peut être mise en œuvre selon la seconde courbe de température lorsque ladite période de temps déterminée est inférieure à une période prédéterminée.According to another characteristic, the temperature rise over time can be implemented according to the second temperature curve when said determined period of time is less than a predetermined period.

Selon une autre caractéristique, la vérification de la mise en œuvre préalable d'un cycle de cuisson comporte la comparaison d'une température de cuisson pendant le cycle de cuisson préalable à une température de cuisson prédéterminée.According to another characteristic, the verification of the prior implementation of a cooking cycle comprises the comparison of a cooking temperature during the preliminary cooking cycle with a predetermined cooking temperature.

Dans un mode de réalisation, la montée de température dans le temps peut être mise en œuvre selon la seconde courbe de température lorsque la température de cuisson est supérieure ou sensiblement égale à la température de cuisson prédéterminée.In one embodiment, the temperature rise over time can be implemented according to the second temperature curve when the cooking temperature is greater than or substantially equal to the predetermined cooking temperature.

Selon une caractéristique, la vérification de la mise en œuvre préalable d'un cycle de cuisson comporte la détermination du temps de cuisson du cycle de cuisson, et la comparaison du temps de cuisson déterminé avec un temps de cuisson prédéterminé.According to one characteristic, the verification of the prior implementation of a cooking cycle comprises determining the cooking time of the cooking cycle, and comparing the determined cooking time with a predetermined cooking time.

Dans un mode de réalisation, la montée de température peut être mise en œuvre selon la seconde courbe de température lorsque le temps de cuisson est supérieur ou sensiblement égal à un temps de cuisson prédéterminé.In one embodiment, the temperature rise can be implemented according to the second temperature curve when the cooking time is greater than or substantially equal to a predetermined cooking time.

Selon une caractéristique, la température de cuisson prédéterminée est sensiblement égale à 140°.According to one characteristic, the predetermined cooking temperature is substantially equal to 140 °.

Selon une autre caractéristique, plusieurs cycles de cuisson ont été préalablement mis en œuvre, chaque cycle de cuisson ayant un temps de cuisson partiel associé, lesdits temps de cuisson correspondant à la somme desdits plusieurs temps de cuisson partiels lorsque la température de la cavité est supérieure à la température prédéterminée entre la mise en œuvre des cycles de cuisson.According to another characteristic, several cooking cycles have been implemented beforehand, each cooking cycle having an associated partial cooking time, said cooking times corresponding to the sum of said several partial cooking times when the temperature of the cavity is higher. at the predetermined temperature between the implementation of the cooking cycles.

Le procédé de nettoyage par pyrolyse présente des caractéristiques et avantages analogues à ceux décrits précédemment en relation avec l'appareil de cuisson.The pyrolysis cleaning process has characteristics and advantages similar to those described above in relation to the cooking appliance.

D'autres particularités et avantages de l'invention apparaîtront encore dans la description ci-après.Other features and advantages of the invention will become apparent in the description below.

Aux dessins annexés, donnés à titre d'exemples non limitatifs :

  • la figure 1 est un schéma représentant un four de cuisson selon un mode de réalisation de l'invention ;
  • la figure 2 illustre des courbes de température mises en œuvre dans un appareil de cuisson conforme à l'invention ; et
  • la figure 3 illustre le procédé de nettoyage par pyrolyse selon un mode de réalisation.
In the accompanying drawings, given by way of non-limiting examples:
  • the figure 1 is a diagram showing a baking oven according to one embodiment of the invention;
  • the figure 2 illustrates temperature curves implemented in a cooking appliance according to the invention; and
  • the figure 3 illustrates the pyrolysis cleaning process according to one embodiment.

La présente invention trouve son application dans un appareil de cuisson comportant une cavité, tel qu'un four de cuisson ou une cuisinière.The present invention finds its application in a cooking appliance comprising a cavity, such as a cooking oven or a stove.

La figure 1 illustre un schéma de profil d'un four de cuisson 1 ayant une fonctionnalité de nettoyage par pyrolyse.The figure 1 illustrates a profile drawing of a baking oven 1 having pyrolysis cleaning functionality.

Le four de cuisson 1 comporte une cavité 2 formée par un ensemble de parois 2a, 2b, 2c, ainsi que par la porte 3 du four de cuisson.The baking oven 1 comprises a cavity 2 formed by a set of walls 2a, 2b, 2c, as well as by the door 3 of the baking oven.

L'ensemble de parois 2a, 2b, 2c ainsi que la porte 3 du four de cuisson 1 formant la cavité 2, constituent le moufle du four de cuisson 1.The set of walls 2a, 2b, 2c as well as the door 3 of the baking oven 1 forming the cavity 2, constitute the muffle of the baking oven 1.

Sur la figure 1, seulement une paroi supérieure 2a, une paroi postérieure 2b opposée à la porte 3 et une paroi inférieure 2c sont visibles.On the figure 1 , only an upper wall 2a, a rear wall 2b opposite to the door 3 and a lower wall 2c are visible.

Le four de cuisson 1 comporte en outre un catalyseur 4 ayant comme fonctionnalité de neutraliser des fumées et des odeurs produites dans la cavité 2 pendant le cycle de nettoyage par pyrolyse. Le catalyseur 4 est situé dans ce mode de réalisation sur la paroi supérieure 2a.The baking oven 1 further comprises a catalyst 4 having the functionality of neutralizing fumes and odors produced in the cavity 2 during the cleaning cycle by pyrolysis. The catalyst 4 is located in this embodiment on the upper wall 2a.

Un ventilateur d'extraction 6 est placé dans un conduit d'évacuation 5. Le ventilateur d'extraction 6 permet d'extraire les fumées produites dans la cavité 2 pendant le cycle de nettoyage par pyrolyse. Le conduit d'évacuation 5 relie l'intérieur du four de cuisson 1, en particulier la cavité 2, avec l'extérieur.An extraction fan 6 is placed in an exhaust duct 5. The extraction fan 6 makes it possible to extract the fumes produced in the cavity 2 during the cleaning cycle by pyrolysis. The exhaust duct 5 connects the interior of the baking oven 1, in particular the cavity 2, with the exterior.

Dans l'exemple de réalisation illustré par la figure 1, le ventilateur d'extraction 6 permet en outre le refroidissement de certaines parties du four de cuisson 1, assurant notamment le refroidissement de la porte 3, ainsi que de la carte électronique (non représentée) comportant notamment des circuits électriques configurés pour gérer le fonctionnement du four de cuisson 1.In the exemplary embodiment illustrated by figure 1 , the extraction fan 6 also allows the cooling of certain parts of the cooking 1, ensuring in particular the cooling of the door 3, as well as of the electronic card (not shown) comprising in particular electrical circuits configured to manage the operation of the cooking oven 1.

L'extraction des fumées générées pendant le cycle de nettoyage par pyrolyse est réalisée par effet venturi. Ainsi, lors du passage de l'air de refroidissement de la porte 3 dans le conduit 5a, le mouvement d'air aspire les fumées issues du catalyseur 4.The extraction of fumes generated during the pyrolysis cleaning cycle is carried out by the venturi effect. Thus, during the passage of the cooling air from the door 3 into the duct 5a, the air movement sucks in the fumes from the catalyst 4.

Lorsqu'un cycle de nettoyage par pyrolyse est mis en œuvre dans le four de cuisson 1, les graisses et les salissures déposées sur les parois 2a, 2b, 2c et la porte 3 brûlent produisant de la fumée et des odeurs.When a pyrolysis cleaning cycle is implemented in the baking oven 1, the grease and dirt deposited on the walls 2a, 2b, 2c and the door 3 burn, producing smoke and odors.

Les fumées et les odeurs traversent le catalyseur 4 débouchant sur le conduit d'évacuation 5a, et sont ensuite brassées et dirigées par le ventilateur d'extraction 6 vers le conduit d'évacuation 5 qui les conduit à l'extérieur du four de cuisson 1.The fumes and odors pass through the catalyst 4 leading to the exhaust duct 5a, and are then stirred and directed by the exhaust fan 6 towards the exhaust duct 5 which leads them outside the baking oven 1. .

Dans l'exemple de réalisation illustrée sur la figure 1, le four de cuisson 1 comprend des moyens de chauffage disposés sur la partie supérieure de la cavité 2 et sur la partie inférieure de la cavité 2.In the exemplary embodiment illustrated on figure 1 , the baking oven 1 comprises heating means arranged on the upper part of the cavity 2 and on the lower part of the cavity 2.

Ces moyens de chauffage comportent dans un exemple de réalisation une résistance haute 7a et une résistance basse 7b.These heating means comprise in an exemplary embodiment a high resistance 7a and a low resistance 7b.

Dans cet exemple de réalisation, la résistance haute 7a est située à l'intérieur de la cavité 2 et la résistance basse 7b est située à l'extérieur de la cavité 2. Cette résistance basse 7b chauffe la paroi inférieure 2c.In this exemplary embodiment, the high resistance 7a is located inside the cavity 2 and the low resistance 7b is located outside the cavity 2. This low resistance 7b heats the lower wall 2c.

La résistance haute 7a et la résistance basse 7b sont utilisées afin de chauffer la cavité 2 lors des modes de cuisson et lors du cycle de nettoyage par pyrolyse.The high resistance 7a and the low resistance 7b are used in order to heat the cavity 2 during the cooking modes and during the pyrolysis cleaning cycle.

Dans cet exemple de réalisation, la résistance haute 7a a une puissance maximale de 2100 watts et la résistance basse 7b a une puissance maximale de 1200 watts.In this exemplary embodiment, the high resistor 7a has a maximum power of 2100 watts and the low resistor 7b has a maximum power of 1200 watts.

Le four de cuisson 1 comporte également un ventilateur de brassage 8 placé dans la cavité 2. Ce ventilateur de brassage 8 peut être utilisé lors des modes de cuisson, dits "à chaleur tournante" ou pour certaines phases du cycle de nettoyage par pyrolyse.The baking oven 1 also includes a mixing fan 8 placed in the cavity 2. This mixing fan 8 can be used during the so-called "rotating heat" cooking modes or for certain phases of the pyrolysis cleaning cycle.

Le ventilateur de brassage 8 est ici considéré comme formant partie des moyens de chauffage.The mixing fan 8 is here considered to form part of the heating means.

Comme il sera décrit plus loin, les moyens de chauffage 7a, 7b, 8 sont configurés de sorte que la température de la cavité 2 évolue dans le temps selon la première courbe de température temp1 ou la seconde courbe de température temp2. As will be described later, the heating means 7a, 7b, 8 are configured so that the temperature of the cavity 2 changes over time according to the first temperature curve temp1 or the second temperature curve temp2.

Le four de cuisson 1 comporte en outre au moins une sonde de température (non représentée sur la figure) pour mesurer la température à l'intérieur du four de cuisson 1.The baking oven 1 further comprises at least one temperature probe (not shown in the figure) for measuring the temperature inside the baking oven 1.

En général, le four de cuisson 1 comporte une sonde de température située dans la partie supérieure du four de cuisson 1.In general, the baking oven 1 has a temperature probe located in the upper part of the baking oven 1.

A partir de la température mesurée par la sonde de température, il est possible de connaitre la température au centre de la cavité 2 du four de cuisson 1, la température de l'émail sur les parois 2a, 2b, 2c ou la température du catalyseur 4.From the temperature measured by the temperature probe, it is possible to know the temperature in the center of cavity 2 of baking oven 1, the temperature of the enamel on the walls 2a, 2b, 2c or the temperature of the catalyst 4.

Dans l'exemple de réalisation décrit, la température de la cavité 2 se réfère à la température au centre de la cavité 2.In the exemplary embodiment described, the temperature of cavity 2 refers to the temperature at the center of cavity 2.

L'appareil de cuisson 1 comporte en outre des moyens de contrôle et de commande (non représentés sur la figure) gérant le fonctionnement de l'appareil de cuisson 1, et en particulier le fonctionnement des moyens utilisés pendant la mise en œuvre d'un cycle de nettoyage par pyrolyse.The cooking appliance 1 further comprises control and command means (not shown in the figure) managing the operation of the cooking appliance 1, and in particular the operation of the means used during the implementation of a pyrolysis cleaning cycle.

La figure 2 représente une première courbe de température temp1 et une seconde courbe de température temp2. Une courbe de température représente l'évolution de la température T de la cavité 2 dans le temps t lors de la mise en œuvre d'un cycle de nettoyage par pyrolyse.The figure 2 represents a first temperature curve temp1 and a second temperature curve temp2. A temperature curve represents the change in temperature T of cavity 2 over time t during the implementation of a cleaning cycle by pyrolysis.

La première courbe de température temp1 représente une montée de température T dans le temps t. Cette courbe de température temp1 est suivie lorsque la cavité 2 se trouve à une température inférieure à une température prédéterminée. Dans l'exemple illustré, la température de la cavité 2 est une température ambiante.The first temperature curve temp1 represents a rise in temperature T over time t. This temperature curve t emp1 is followed when the cavity 2 is at a temperature below a predetermined temperature. In the example illustrated, the temperature of the cavity 2 is an ambient temperature.

La seconde courbe de température temp2 représente une montée de température T dans le temps t lorsqu'un cycle de cuisson a été préalablement mis en œuvre et que lorsque le cycle de nettoyage par pyrolyse débute, la cavité 2 se trouve à une température initiale Ti supérieure à la température prédéterminée. Ici, cette température initiale Ti est d'environ 160°C.The second temperature curve temp2 represents a rise in temperature T over time t when a cooking cycle has been previously implemented and when the pyrolysis cleaning cycle begins, the cavity 2 is at an initial temperature T i greater than the predetermined temperature. Here, this initial temperature T i is around 160 ° C.

Par exemple, on effectue le nettoyage par pyrolyse après un cycle de cuisson et la température prédéterminée présente une valeur sensiblement égale à 100°C.For example, cleaning is carried out by pyrolysis after a cooking cycle and the predetermined temperature has a value substantially equal to 100 ° C.

La valeur de 100°C a été définie de manière empirique pour que la montée de température du moufle bénéficie d'une bonne inertie thermique en minimisant le risque de casse de l'émail.The value of 100 ° C was defined empirically so that the temperature rise of the muffle benefits from good thermal inertia while minimizing the risk of enamel breakage.

Bien entendu, la température prédéterminée pourrait présenter d'autres valeurs.Of course, the predetermined temperature could have other values.

Un cycle de nettoyage par pyrolyse comprend une première phase A1, A2 dans laquelle la température T de la cavité 2 augmente progressivement depuis une température initiale Ti jusqu'à la température de pyrolyse Tp et une deuxième phase B1, B2 dans laquelle la température de pyrolyse Tp est maintenue.A pyrolysis cleaning cycle comprises a first phase A1, A2 in which the temperature T of the cavity 2 increases progressively from an initial temperature T i to the pyrolysis temperature T p and a second phase B1, B2 in which the temperature T p pyrolysis is maintained.

Lorsqu'aucun cycle de cuisson n'a pas été mis en œuvre et qu'un cycle de nettoyage par pyrolyse est initié, la température initiale Ti est sensiblement égale à la température ambiante ou température externe du four de cuisson 1.When no cooking cycle has been implemented and a pyrolysis cleaning cycle is initiated, the initial temperature T i is substantially equal to the ambient temperature or external temperature of the cooking oven 1.

Cette température ambiante peut ainsi varier dans une plage de valeurs comprise entre 15°C et 35°C et présente une valeur typique de 20°C.This ambient temperature can thus vary within a range of values between 15 ° C and 35 ° C and has a typical value of 20 ° C.

Lorsqu'un cycle de cuisson a été mise en œuvre, la température initiale Ti est bien entendu supérieure à la température ambiante.When a cooking cycle has been implemented, the initial temperature T i is of course higher than the ambient temperature.

En général, la température de pyrolyse Tp présente une valeur entre 480° et 500°.In general, the pyrolysis temperature T p has a value between 480 ° and 500 °.

On notera que la première phase A1, A2 du cycle par pyrolyse comporte une première partie A1i-c, A2i-c dans laquelle la température de la cavité 2 augmente depuis la température initiale Ti jusqu'à la température d'activation Tc du catalyseur 4, et une seconde partie A1c-p, A2c-p dans laquelle la température de la cavité 2 augmente depuis la température d'activation Tc du catalyseur 4 jusqu'à la température de pyrolyse Tp.It will be noted that the first phase A1, A2 of the cycle by pyrolysis comprises a first part A1i-c, A2i-c in which the temperature of the cavity 2 increases from the initial temperature T i to the activation temperature T c of the catalyst 4, and a second part A1c-p, A2c-p in which the temperature of cavity 2 increases from the activation temperature T c of catalyst 4 to the pyrolysis temperature T p .

On entend par température d'activation Tc du catalyseur 4, la température à partir de laquelle le catalyseur 4 est suffisamment chaud pour catalyser les fumées produites pendant un cycle de nettoyage par pyrolyse.The term “activation temperature T c of catalyst 4” is understood to mean the temperature above which catalyst 4 is sufficiently hot to catalyze the fumes produced during a cycle of cleaning by pyrolysis.

La température d'activation Tc du catalyseur 4 se situe entre 250°C et 350°C.The activation temperature T c of catalyst 4 is between 250 ° C and 350 ° C.

On entend par température de pyrolyse Tp la température à laquelle il faut maintenir la cavité 2 afin de réaliser efficacement la décomposition des composés organiques.The term “pyrolysis temperature T p” is understood to mean the temperature at which cavity 2 must be maintained in order to effectively decompose the organic compounds.

La température de pyrolyse Tp est arbitrairement définie et est supérieure à la température théorique à partir de laquelle débute la réaction de décomposition des composés organiques.The pyrolysis temperature T p is arbitrarily defined and is higher than the theoretical temperature from which the decomposition reaction of organic compounds begins.

Lorsque la température initiale Ti présente une valeur inférieure à la température prédéterminée, par exemple une température sensiblement égale à la température ambiante, la température de la cavité 2 augmente dans le temps selon la première courbe de température temp1. When the initial temperature T i has a value lower than the predetermined temperature, for example a temperature substantially equal to the ambient temperature, the temperature of the cavity 2 increases over time according to the first temperature curve temp1.

En effet, comme il sera décrit plus loin, les moyens de chauffage (résistances 7a, 7b et ventilateur de brassage 8) sont configurés de sorte que la température de la cavité 2 augmente selon la première courbe de température temp1. Indeed, as will be described later, the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the first temperature curve temp1.

Lorsque la température initiale Ti est supérieure ou sensiblement égale à une température prédéterminée, après qu'un cycle de cuisson ait été mis en œuvre, la température de la cavité 2 augmente depuis la température initiale Ti jusqu'à la température de pyrolyse Tp selon la seconde courbe de température temp2. When the initial temperature T i is greater than or substantially equal to a predetermined temperature, after a cooking cycle has been implemented, the temperature of the cavity 2 increases from the initial temperature T i to the pyrolysis temperature T p according to the second temperature curve temp2.

En effet, les moyens de chauffage (résistances 7a, 7b et ventilateur de brassage 8) sont configurés pour que la température de la cavité 2 augmente selon la seconde courbe de température temp2. Indeed, the heating means (resistors 7a, 7b and mixing fan 8) are configured so that the temperature of the cavity 2 increases according to the second temperature curve temp2.

On notera que lorsqu'un cycle de cuisson a été préalablement mis en œuvre et que la température initiale Ti est inférieure à la température prédéterminée lorsqu'un cycle de nettoyage par pyrolyse est initié, la température de la cavité 2 augmente jusqu'à la température de pyrolyse Tp selon la première courbe de température temp1. It will be noted that when a cooking cycle has been implemented beforehand and that the initial temperature T i is lower than the predetermined temperature when a pyrolysis cleaning cycle is initiated, the temperature of the cavity 2 increases to the pyrolysis temperature T p according to the first temperature curve temp1.

La seconde courbe de température temp2 comprend au moins une portion temp2(1) sensiblement linéaire correspondant à un intervalle de températures IT.The second temperature curve temp2 comprises at least one substantially linear portion temp2 (1) corresponding to a temperature interval I T.

Dans le mode de réalisation représenté, l'intervalle de températures IT correspond sensiblement aux températures au début et à la fin de la seconde partie A1c-p, A2c-p du cycle de nettoyage par pyrolyse, c'est-à-dire que l'intervalle de températures IT correspond à l'intervalle compris entre la température d'activation Tc du catalyseur 4 et la température de pyrolyse Tp.In the embodiment shown, the temperature interval I T corresponds substantially to the temperatures at the start and at the end of the second part A1c-p, A2c-p of the pyrolysis cleaning cycle, that is to say that the temperature interval I T corresponds to the interval between the activation temperature T c of catalyst 4 and the pyrolysis temperature T p .

La portion temp2(1) de la seconde courbe de température temp2 présente une pente a2 de valeur supérieure à la valeur de la pente α1 d'une portion temp1(1) de la première courbe de température temp1 correspondant au même intervalle de température IT.The portion temp2 (1) of the second temperature curve temp2 has a slope a2 of a value greater than the value of the slope α1 of a portion temp1 (1) of the first temperature curve temp1 corresponding to the same temperature interval I T .

Ainsi, la température de pyrolyse Tp est atteinte plus rapidement lorsque la montée de température est mise en œuvre selon la seconde courbe de température temp2. Thus, the pyrolysis temperature T p is reached more quickly when the temperature rise is implemented according to the second temperature curve temp2.

On notera que cette montée rapide en température est mise en œuvre une fois la température d'activation Tc du catalyseur 4 atteinte, les odeurs et les fumées produites dans la cavité 2 de l'appareil de cuisson 1 étant ainsi neutralisées.It will be noted that this rapid rise in temperature is implemented once the activation temperature T c of the catalyst 4 has been reached, the odors and the fumes produced in the cavity 2 of the cooking appliance 1 thus being neutralized.

En outre, l'émail est préservé d'une possible casse.In addition, the enamel is preserved from possible breakage.

Par ailleurs, dans un mode de réalisation de la présente invention, le ventilateur d'extraction 6 fonctionne à une vitesse de rotation qui est fonction de la température de la cavité 2.Furthermore, in one embodiment of the present invention, the extraction fan 6 operates at a speed of rotation which is a function of the temperature of the cavity 2.

Le fonctionnement du ventilateur d'extraction 6 est commandé par des moyens de commande (non représentés sur les figures) du ventilateur d'extraction 6.The operation of the extraction fan 6 is controlled by control means (not shown in the figures) of the extraction fan 6.

Le ventilateur d'extraction 6 est mis en fonctionnement à une vitesse minimale de rotation lorsque la cavité 2 se trouve à la température initiale Ti.The extraction fan 6 is put into operation at a minimum speed of rotation when the cavity 2 is at the initial temperature T i .

Lorsque la température de la cavité 2 augmente, les moyens de commande mettent en fonctionnement le ventilateur d'extraction 6 à une vitesse de rotation supérieure.When the temperature of the cavity 2 increases, the control means activate the extraction fan 6 at a higher speed of rotation.

Grâce à cette fonctionnalité, l'extraction des odeurs et des fumées provenant des graisses et salissures brûlées en début du cycle de nettoyage par pyrolyse, lorsque le catalyseur 4 n'est pas encore activé (correspondant à la première partie A1i-c, A2i-c de la première phase A1, A2 du cycle de nettoyage par pyrolyse), sont limitées.Thanks to this functionality, the extraction of odors and fumes from grease and dirt burnt at the start of the cleaning cycle by pyrolysis, when catalyst 4 is not yet activated (corresponding to the first part A1i-c, A2i- c of the first phase A1, A2 of the pyrolysis cleaning cycle), are limited.

En outre, lorsque le cycle de nettoyage par pyrolyse est mis en œuvre à la suite d'un cycle de cuisson, l'extraction des fumées produites par les graisses chauffées pendant le cycle de cuisson est aussi limitée.In addition, when the pyrolysis cleaning cycle is implemented following a cooking cycle, the extraction of fumes produced by the fats heated during the cooking cycle is also limited.

Dans un premier mode de réalisation, pendant la première partie A1i-c, A2i-c de la première phase A1, A2 du cycle de nettoyage par pyrolyse, le ventilateur d'extraction 6 fonctionne à une première vitesse de rotation correspondant à la vitesse de rotation minimale, et dans la seconde partie A1c-p, A2c-p de la première phase A1, A2 du cycle de nettoyage par pyrolyse, le ventilateur d'extraction 6 fonctionne à une deuxième vitesse de rotation qui est plus élevée que la vitesse de rotation minimale.In a first embodiment, during the first part A1i-c, A2i-c of the first phase A1, A2 of the pyrolysis cleaning cycle, the extraction fan 6 operates at a first speed of rotation corresponding to the speed of minimum rotation, and in the second part A1c-p, A2c-p of the first phase A1, A2 of the pyrolysis cleaning cycle, the extraction fan 6 operates at a second speed of rotation which is higher than the speed of minimum rotation.

Dans un deuxième mode de réalisation, la vitesse de rotation du ventilateur d'extraction 6 augmente progressivement et proportionnellement à l'augmentation de la température de la cavité 2 depuis la température initiale Ti jusqu'à la température de pyrolyse Tp.In a second embodiment, the speed of rotation of the extraction fan 6 increases progressively and proportionally to the increase in the temperature of the cavity 2 from the initial temperature T i to the pyrolysis temperature T p .

Par exemple, la vitesse de rotation du ventilateur d'extraction 6 peut augmenter par paliers ou linéairement.For example, the speed of rotation of the exhaust fan 6 can increase in stages or linearly.

Dans un mode de réalisation, la vitesse de rotation du ventilateur d'extraction 6 présente une valeur minimale lorsque la température est inférieure à une température prédéfinie, par exemple de valeur sensiblement égale à 200°C.In one embodiment, the speed of rotation of the extraction fan 6 has a minimum value when the temperature is lower than a predefined temperature, for example of a value substantially equal to 200 ° C.

On notera que le ventilateur d'extraction 6 doit fonctionner à une vitesse minimale afin d'assurer sa fonction de refroidissement.It will be noted that the extraction fan 6 must operate at a minimum speed in order to ensure its cooling function.

Ensuite, la vitesse de rotation peut augmenter linéairement lorsque la température augmente entre la première température prédéfinie et la température de pyrolyse Tp (environ 500°C).Then, the speed of rotation can increase linearly when the temperature increases between the first predefined temperature and the pyrolysis temperature T p (approximately 500 ° C.).

A titre d'exemple nullement limitatif, lorsque la température de la cavité 2 est de 200°C, la vitesse de rotation du ventilateur d'extraction est de 45% de sa vitesse de rotation maximale et augmente linéairement jusqu'à ce que la cavité 2 présente une température sensiblement inférieure à la température de pyrolyse Tp, par exemple de 494°C, la vitesse de rotation est alors de 76% de sa vitesse de rotation maximale.By way of non-limiting example, when the temperature of cavity 2 is 200 ° C, the speed of rotation of the extraction fan is 45% of its maximum rotational speed and increases linearly until cavity 2 has a temperature substantially lower than the pyrolysis temperature T p , for example 494 ° C, the rotational speed is then 76% of its maximum rotational speed.

Ensuite, lorsque la température de la cavité est sensiblement égale à la température de pyrolyse Tp, par exemple de 495°C, la vitesse de rotation du ventilateur d'extraction 6 fonctionne à sa vitesse de rotation maximale.Then, when the temperature of the cavity is substantially equal to the pyrolysis temperature T p , for example 495 ° C., the speed of rotation of the extraction fan 6 operates at its maximum speed of rotation.

Un mode de réalisation du procédé de nettoyage par pyrolyse mise en œuvre dans un four de cuisson 1 tel que décrit ci-dessus, sera décrit en référence à la figure 3.An embodiment of the pyrolysis cleaning process implemented in a cooking oven 1 as described above, will be described with reference to figure 3 .

Pour la mise en œuvre du procédé de nettoyage par pyrolyse, le four de cuisson 1 comporte en outre des moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson et des moyens de comparaison (non représentés sur les figures) pour comparer la température initiale Ti de la cavité 2 à la température prédéterminée. En particulier, les moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson comportent des moyens de comparaison (non représentés) pour comparer une température de cuisson Tu du cycle de cuisson préalable, à une température de cuisson prédéterminée.For the implementation of the pyrolysis cleaning process, the baking oven 1 further comprises means for verifying the prior implementation of a baking cycle and comparison means (not shown in the figures) for comparing the initial temperature T i of the cavity 2 at the predetermined temperature. In particular, the means for verifying the prior implementation of a cooking cycle include comparison means (not shown) for comparing a cooking temperature T u of the preliminary cooking cycle, with a predetermined cooking temperature.

La température de cuisson Tu prédéterminée présente par exemple une valeur de 140°C.The predetermined cooking temperature T u has, for example, a value of 140 ° C.

Cette valeur de 140°C correspond à une température minimale des parois 2a, 2b, 2c du moufle et pourrait bien entendu présenter d'autres valeurs.This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.

Le four de cuisson 1 comporte en outre des moyens de mémorisation dans lesquels la température de cuisson Tu dans un cycle de cuisson est stockée.The baking oven 1 further comprises storage means in which the baking temperature T u in a baking cycle is stored.

La température de cuisson Tu mémorisée peut être la température de consigne du cycle de cuisson.The stored cooking temperature T u can be the setpoint temperature for the cooking cycle.

Alternativement, la température de cuisson Tu mémorisée peut être la température mesurée lors du cycle de cuisson.Alternatively, the stored cooking temperature T u can be the temperature measured during the cooking cycle.

En outre, les moyens de vérification de la mise en œuvre préalable d'un cycle de cuisson comportent des moyens de détermination du temps de cuisson et des moyens de détermination de la période de temps écoulé entre la fin d'un cycle de cuisson et le début d'un cycle de nettoyage par pyrolyse, ainsi que des moyens de comparaison du temps de cuisson avec un temps de cuisson prédéterminé et des moyens de comparaison de ladite période de temps déterminé avec une période de temps prédéterminée.In addition, the means for verifying the prior implementation of a cooking cycle comprise means for determining the cooking time and means for determining the period of time elapsed between the end of a cooking cycle and the start of a pyrolysis cleaning cycle, as well as means for comparing the cooking time with a predetermined cooking time and means for comparing said determined period of time with a period of predetermined time.

Les moyens de comparaison des températures, de détermination des périodes de temps, de détermination du temps de cuisson et de mémorisation de données telles que des températures ou des temps, sont connus de l'homme du métier et ne nécessitent pas d'être décrits ici en détail.The means for comparing temperatures, determining time periods, determining cooking time and storing data such as temperatures or times are known to those skilled in the art and do not need to be described here. in detail.

En revenant aux moyens de chauffage, ils sont configurés de façon à ce que la température de la cavité 2 suive dans le temps t une courbe de température temp1, temp2. Ainsi, la montée de température de la cavité 2 est mise en œuvre selon ladite courbe de température.Returning to the heating means, they are configured so that the temperature of the cavity 2 follows a temperature curve temp1, temp2 over time t . Thus, the temperature rise of the cavity 2 is implemented according to said temperature curve.

Comme indiqué ci-dessus, les moyens de chauffage comportent en particulier la résistance haute 7a, la résistance basse 7b et le ventilateur de brassage 8.As indicated above, the heating means comprise in particular the high resistance 7a, the low resistance 7b and the mixing fan 8.

Dans un mode de réalisation, lorsque la température initiale Ti est supérieure ou sensiblement égale à une température prédéterminée (dans l'exemple représenté sur la figure 2, la température initiale Ti présente une valeur de 160°) et que le nettoyage par pyrolyse s'effectue après un cycle de cuisson, les moyens de chauffage 7a, 7b, 8 sont commandés en fonctionnement de sorte que la température dans la cavité 2 augmente dans le temps t selon la seconde courbe de température temp2. In one embodiment, when the initial temperature T i is greater than or substantially equal to a predetermined temperature (in the example shown in figure 2 , the initial temperature T i has a value of 160 °) and that the cleaning by pyrolysis is carried out after a cooking cycle, the heating means 7a, 7b, 8 are controlled in operation so that the temperature in the cavity 2 increases in time t according to the second temperature curve temp2.

Dans un exemple de réalisation, pendant la première partie A2i-c de la première phase A2, seulement la résistance haute 7a est alimentée à 83% de sa puissance maximale (ici 1750 watts). Pendant la seconde partie A2c-p de la première phase A2, la résistance haute 7a est alimentée à pleine puissance, c'est-à-dire à 100% de sa puissance (2100 watts dans cet exemple), la résistance basse 7b est alimentée à 80% de sa puissance (ici 960 watts) et le ventilateur de brassage 8 est activé.In an exemplary embodiment, during the first part A2i-c of the first phase A2, only the high resistor 7a is supplied at 83% of its maximum power (here 1750 watts). During the second part A2c-p of the first phase A2, the high resistor 7a is supplied at full power, that is to say at 100% of its power (2100 watts in this example), the low resistor 7b is supplied at 80% of its power (here 960 watts) and the brewing fan 8 is activated.

Pendant la seconde phase B2 du cycle de nettoyage par pyrolyse, les moyens de commande gérant le fonctionnement du four commandent le maintien de la température de la cavité 2 à la température de pyrolyse Tp (par exemple de 492°).During the second phase B2 of the pyrolysis cleaning cycle, the control means managing the operation of the oven control the maintaining the temperature of the cavity 2 at the pyrolysis temperature T p (for example 492 °).

Lorsqu'un utilisateur commande un cycle de nettoyage par pyrolyse et que la température initiale Ti de la cavité 2 est inférieure à la température prédéterminée, indépendamment du fait qu'un cycle de cuisson ait été préalablement mis en œuvre ou pas, les moyens de chauffage 7a, 7b, 8 sont commandés en fonctionnement de sorte que la température de la cavité 2 augmente dans le temps t selon la première courbe de température temp1. Ainsi, selon un mode de réalisation, les moyens de chauffage 7a, 7b, 8 sont mis en fonctionnement de la manière suivante.When a user orders a pyrolysis cleaning cycle and the initial temperature T i of the cavity 2 is lower than the predetermined temperature, regardless of whether a cooking cycle has been implemented beforehand or not, the means of heating 7a, 7b, 8 are controlled in operation so that the temperature of cavity 2 increases in time t according to the first temperature curve temp1. Thus, according to one embodiment, the heating means 7a, 7b, 8 are put into operation as follows.

Pendant la première partie à A1i-c de la première phase A1 du cycle de nettoyage par pyrolyse, c'est-à-dire entre la température ambiante et la température d'activation Tc du catalyseur 4, la résistance haute 7a est alimentée à 83% de sa puissance maximale (ici 1750 watts).During the first part at A1i-c of the first phase A1 of the pyrolysis cleaning cycle, that is to say between room temperature and the activation temperature T c of catalyst 4, the high resistance 7a is supplied to 83% of its maximum power (here 1750 watts).

Dans un exemple de réalisation, La résistance haute 7a est activée à 100% de sa puissance maximale (par exemple 2100 watts) pendant une première période prédéfinie puis désactivée pendant une seconde période prédéfinie la première période prédéfinie présente une valeur de 50 secondes et la seconde période prédéfinie présente une valeur de 10 secondes. Ainsi, la résistance haute 7a est activée périodiquement toutes les 50 secondes sur 60 secondes, ce qui permet une alimentation moyenne à 83% de sa puissance maximale.In an exemplary embodiment, the high resistor 7a is activated at 100% of its maximum power (for example 2100 watts) for a first predefined period then deactivated for a second predefined period the first predefined period has a value of 50 seconds and the second preset period has a value of 10 seconds. Thus, the high resistance 7a is activated periodically every 50 seconds out of 60 seconds, which allows an average power supply at 83% of its maximum power.

La deuxième partie A1c-p de la première phase A1 du cycle de nettoyage par pyrolyse est divisée en trois phases partielles.The second part A1c-p of the first phase A1 of the pyrolysis cleaning cycle is divided into three partial phases.

Pendant une première phase partielle comprise entre la température d'activation Tc du catalyseur 4 et une température intermédiaire, étant par exemple ici de 420°C, la résistance haute 7a fonctionne, comme pour la première partie A1ic de la première phase A1, à 83% de sa puissance maximale et la résistance basse 7b fonctionne à 33% de sa puissance maximale, par exemple en fonctionnant à pleine puissance périodiquement pendant 20 secondes sur 60 secondes.During a first partial phase between the activation temperature T c of the catalyst 4 and an intermediate temperature, being for example here 420 ° C, the high resistance 7a operates, as for the first part A1ic of the first phase A1, at 83% of its maximum power and the low resistor 7b is operating at 33% of its maximum power, for example by operating at full power periodically for 20 seconds out of 60 seconds.

Pendant une seconde phase partielle débutant à la température intermédiaire, étant ici de 420°C et allant jusqu'à une seconde température intermédiaire, étant ici de 475°C, la résistance haute 7a est activée à 80%, par exemple en l'alimentant à pleine puissance périodiquement pendant 48 secondes sur 60 secondes et la résistance basse 7b est activée à pleine puissance (ici 1200 watts)During a second partial phase starting at the intermediate temperature, being here 420 ° C and going up to a second intermediate temperature, being here of 475 ° C, the high resistance 7a is activated at 80%, for example by feeding it. at full power periodically for 48 seconds out of 60 seconds and the low resistance 7b is activated at full power (here 1200 watts)

Pendant une troisième phase partielle allant de la seconde température intermédiaire, étant ici de 475°C, à la température de pyrolyse Tp, étant ici de 492°C, la résistance haute 7a est mise en fonctionnement à pleine puissance, la résistance basse 7b est mise en fonctionnement à pleine puissance périodiquement pendant 48 secondes sur 60 secondes (soit 80% de sa puissance maximale), et le ventilateur de brassage 8 est activé.During a third partial phase going from the second intermediate temperature, here being 475 ° C, to the pyrolysis temperature T p , being here 492 ° C, the high resistor 7a is put into operation at full power, the low resistor 7b is put into operation at full power periodically for 48 seconds out of 60 seconds (i.e. 80% of its maximum power), and the circulation fan 8 is activated.

Finalement, comme dans le cas où la montée de température suit la seconde courbe de température temp2, une fois que la température de la cavité 2 est arrivée à la température de pyrolyse Tp, les moyens de commande gérant le fonctionnement du four de cuisson 1 commandent le maintien de la température de la cavité 2 à la température de pyrolyse Tp, par exemple à 492°C.Finally, as in the case where the temperature rise follows the second temperature curve temp2, once the temperature of the cavity 2 has reached the pyrolysis temperature T p , the control means managing the operation of the baking oven 1 control the maintenance of the temperature of the cavity 2 at the pyrolysis temperature T p , for example at 492 ° C.

Bien entendu, les périodes prédéfinies d'activation des moyens de chauffage 7a, 7b, 8, ainsi que les puissances de chauffage peuvent être différentes afin de pouvoir reproduire les courbes de température temp1, temp2. Of course, the predefined periods of activation of the heating means 7a, 7b, 8, as well as the heating powers may be different in order to be able to reproduce the temperature curves temp1, temp2.

La figure 3 représente un mode de réalisation d'un procédé de nettoyage par pyrolyse conforme à l'invention.The figure 3 represents an embodiment of a pyrolysis cleaning process according to the invention.

En effet, afin de bénéficier de l'inertie thermique du moufle après un cycle de cuisson, il est nécessaire que le cycle de cuisson préalable ai été effectué.Indeed, in order to benefit from the thermal inertia of the muffle after a firing cycle, it is necessary that the preliminary firing cycle has been carried out.

On notera que les étapes et l'ordre de mise en œuvre des étapes représentées sur la figure 3 peut varier. En outre, certaines des étapes sont optionnelles, le procédé de nettoyage par pyrolyse pouvant être mis en œuvre selon plusieurs modes de réalisation.It will be noted that the steps and the order of implementation of the steps shown on the figure 3 can vary. In addition, some of the steps are optional, the pyrolysis cleaning process being able to be implemented according to several embodiments.

Le procédé de nettoyage par pyrolyse mis en œuvre dans un appareil de cuisson 1, tel qu'un four de cuisson comme celui représenté sur la figure 1, comporte une étape de vérification de la mise en œuvre préalable d'un cycle de cuisson E1.The pyrolysis cleaning process implemented in a cooking appliance 1, such as a cooking oven such as that shown in FIG. figure 1 , includes a step of verifying the prior implementation of a cooking cycle E1.

Le procédé de nettoyage par pyrolyse comporte en outre une étape de comparaison E2 de la température initiale Ti de la cavité 2 avec une température prédéterminée.The pyrolysis cleaning process further comprises a step of comparison E2 of the initial temperature T i of the cavity 2 with a predetermined temperature.

Dans un mode de réalisation, la température prédéterminée présente une valeur de 100° C.In one embodiment, the predetermined temperature has a value of 100 ° C.

Cette valeur de 100° C a été déterminé empiriquement pour que la monté de température tire bénéfice de l'inertie thermique du moufle, et peut, bien entendu, présenter d'autres valeurs différentes.This value of 100 ° C was determined empirically so that the rise in temperature takes advantage of the thermal inertia of the muffle, and can, of course, have other different values.

Lorsque la température initiale Ti est inférieure à la température prédéterminée, la montée de la température est mise en œuvre selon la première courbe de température temp1. When the initial temperature T i is lower than the predetermined temperature, the rise in temperature is implemented according to the first temperature curve temp1.

Par exemple, lorsque la température initiale Ti est sensiblement égale à la température ambiante, la montée de température dans le temps est mise en œuvre selon la première courbe de température temp1. For example, when the initial temperature T i is substantially equal to the ambient temperature, the temperature rise over time is implemented according to the first temperature curve temp1.

Lorsque la température initiale Ti est supérieure ou sensiblement égale à une température prédéterminée et qu'un cycle préalable de cuisson a été mise en œuvre (E1), la montée de température dans le temps est mise en œuvre selon la seconde courbe de température temp2. When the initial temperature T i is greater than or substantially equal to a predetermined temperature and a prior cooking cycle has been implemented (E1), the temperature rise over time is implemented according to the second temperature curve temp2 .

Dans le mode de réalisation décrit, la vérification E1 de la mise en œuvre préalable d'un cycle de cuisson comporte une étape de comparaison E3 d'une température de cuisson Tu avec une température de cuisson prédéterminée. Cette température de cuisson Tu correspond à la température de cuisson du cycle de cuisson préalable au cycle de nettoyage par pyrolyse.In the embodiment described, the verification E1 of the prior implementation of a cooking cycle comprises a step of comparison E3 of a cooking temperature T u with a predetermined cooking temperature. This cooking temperature T u corresponds to the cooking temperature of the cooking cycle prior to the pyrolysis cleaning cycle.

La température de cuisson Tu peut par exemple être fixée par un utilisateur du four de cuisson 1 au moyen d'une interface homme-machine comportant des organes de commande et des afficheurs ou peut être automatiquement définie par un calculateur dans un mode de cuisson spécifique.The cooking temperature T u can for example be set by a user of the cooking oven 1 by means of a man-machine interface comprising control devices and displays or can be automatically defined by a computer in a specific cooking mode. .

La température de cuisson prédéterminée présente par exemple une valeur de 140°C.The predetermined cooking temperature has, for example, a value of 140 ° C.

Cette valeur de 140°C correspond à une température minimale des parois 2a, 2b, 2c du moufle et pourrait bien entendu présenter d'autres valeurs.This value of 140 ° C corresponds to a minimum temperature of the walls 2a, 2b, 2c of the muffle and could of course have other values.

Lorsque la température de cuisson Tu est inférieure à la température de cuisson prédéterminée, la montée de température dans le temps est mise en œuvre selon la première courbe de température temp1. When the cooking temperature T u is lower than the predetermined cooking temperature, the temperature rise over time is implemented according to the first temperature curve temp1.

On notera que dans ce cas, la température de la cavité 2 ne présente pas une valeur suffisante pour que la montée de température pendant le cycle de nettoyage par pyrolyse tire profit d'une inertie thermique.It will be noted that in this case, the temperature of the cavity 2 does not have a sufficient value for the temperature rise during the pyrolysis cleaning cycle to take advantage of thermal inertia.

Au contraire, lorsque la température de cuisson Tu est supérieure ou sensiblement égale à la température de cuisson prédéterminée et que la température initiale est supérieure ou égale à la température prédéterminée, la montée de température dans le temps est mise en œuvre selon la seconde courbe de température temp2. On the contrary, when the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature and the initial temperature is greater than or equal to the predetermined temperature, the temperature rise over time is implemented according to the second curve temperature temp2.

Dans le mode de réalisation décrit, la vérification E1 de la mise en œuvre préalable d'un cycle de cuisson comporte une étape de détermination du temps de cuisson du cycle de cuisson mis en œuvre préalablement au cycle de nettoyage par pyrolyse, ainsi qu'une étape de comparaison E4 du temps de cuisson déterminé avec un temps de cuisson prédéterminé tc.In the embodiment described, the verification E1 of the prior implementation of a cooking cycle comprises a step of determining the cooking time of the cooking cycle implemented prior to the pyrolysis cleaning cycle, as well as a comparison step E4 of the determined cooking time with a predetermined cooking time t c .

Lorsque le temps de cuisson est supérieur ou sensiblement égal au temps de cuisson prédéterminé te, la montée de température est mise en œuvre selon la seconde courbe de température temp2. When the cooking time is greater than or substantially equal to the predetermined cooking time te, the temperature rise is implemented according to the second temperature curve temp2.

Lorsqu'un cycle de cuisson est mis en œuvre préalablement au cycle de nettoyage par pyrolyse, la température de cuisson Tu est au minimum de 140°C.When a cooking cycle is implemented prior to the pyrolysis cleaning cycle, the cooking temperature T u is at least 140 ° C.

Ainsi, dans un autre mode de réalisation, la détermination du temps de cuisson équivaut à déterminer le temps pendant lequel la température de cuisson Tu est supérieure ou sensiblement égale à la température de cuisson prédéterminée (ici de 140°C).Thus, in another embodiment, determining the cooking time is equivalent to determining the time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature (here of 140 ° C.).

Au contraire, lorsque le temps de cuisson est inférieur au temps de cuisson prédéterminé tc, la température est mise en œuvre selon la première courbe de température temp1. On the contrary, when the cooking time is less than the predetermined cooking time t c , the temperature is implemented according to the first temperature curve temp1.

Par exemple, le temps de cuisson prédéterminé tc s'élève à 25 min. Le temps de cuisson a été déterminé empiriquement pour que la cavité 2 du four de cuisson 1 mis en fonctionnement à une température de cuisson Tu d'au moins 140°C ait de l'inertie thermique lorsque la montée de température suit la seconde courbe de température temp2. For example, the predetermined cooking time t c is 25 min. The baking time has been determined empirically so that the cavity 2 of the baking oven 1 operated at a baking temperature T u of at least 140 ° C has thermal inertia when the temperature rise follows the second curve temperature temp2.

Dans un mode de réalisation avantageuse de l'invention, le temps de cuisson prédéterminé tc peut être composé par plusieurs temps de cuisson partiels associés à des cycles de cuisson différents mis en œuvre pendant une durée inférieure au temps de cuisson prédéterminé tc.In an advantageous embodiment of the invention, the predetermined cooking time t c can be made up of several partial cooking times associated with different cooking cycles implemented for a period less than the predetermined cooking time t c .

Pour que les temps de cuisson partiels puissent former un temps de cuisson, la température de la cavité 2 entre des cycles de cuisson ne doit pas descendre de la température prédéterminée (ici de 100°C).So that the partial cooking times can form a cooking time, the temperature of the cavity 2 between cooking cycles must not drop from the predetermined temperature (here by 100 ° C).

A titre d'exemple, lorsque plusieurs cycles de cuisson sont mis en œuvre, et que chaque cycle de cuisson a une durée de 15 min, ces durées de 15 min de cuisson forment un temps de cuisson unique lorsque la température de la cavité 2 est supérieure à la température prédéterminée pendant et entre la mise en œuvre des trois cycles de cuisson.For example, when several cooking cycles are implemented, and each cooking cycle has a duration of 15 min, these 15 min cooking times form a single cooking time when the temperature of cavity 2 is above the predetermined temperature during and between the implementation of the three cooking cycles.

On notera que lors de l'étape de vérification E1, il est vérifié qu'un cycle de cuisson a été mise en œuvre à une température de cuisson minimale et/ou durant un temps de cuisson minimal afin de bénéficier de l'inertie thermique du moufle.It will be noted that during the verification step E1, it is verified that a cooking cycle has been implemented at a minimum cooking temperature and / or during a minimum cooking time in order to benefit from the thermal inertia of the mitten.

On notera que les étapes de comparaison E2, E3, E4 peuvent être mises en œuvre dans l'ordre précité, ou dans tout autre ordre.It will be noted that the comparison steps E2, E3, E4 can be implemented in the aforementioned order, or in any other order.

Ainsi, le procédé de nettoyage peut être mis en œuvre selon plusieurs modes de réalisation.Thus, the cleaning method can be implemented according to several embodiments.

Selon un mode de réalisation, le procédé de nettoyage par pyrolyse comporte l'étape de comparaison d'une température initiale Ti avec la température prédéterminée E2 ainsi que l'étape de comparaison E3 de la température de cuisson Tu avec la température de cuisson prédéterminée.According to one embodiment, the method of cleaning by pyrolysis comprises the step of comparing an initial temperature T i with the predetermined temperature E2 as well as the step E3 of comparing the cooking temperature T u with the cooking temperature predetermined.

Selon encore un autre mode de réalisation, il comporte l'étape de comparaison E2 de la température initiale Ti à la température prédéterminée, l'étape de comparaison E3 de la température de cuisson Tu à la température de cuisson prédéterminée, et l'étape de comparaison E4 du temps de cuisson au temps de cuisson prédéterminé tc.According to yet another embodiment, it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, the step E3 of comparing the cooking temperature T u with the predetermined cooking temperature, and the comparison step E4 of the cooking time with the predetermined cooking time t c .

Selon encore un autre mode de réalisation, il comporte l'étape de comparaison E2 de la température initiale Ti à la température prédéterminée, et l'étape de comparaison E4 du temps de cuisson au temps de cuisson prédéterminé tc.According to yet another embodiment, it comprises the step E2 of comparing the initial temperature T i with the predetermined temperature, and the step E4 of comparing the cooking time with the predetermined cooking time t c .

Le procédé de nettoyage par pyrolyse peut comporter en outre une étape de détermination (non représentée) de la période de temps écoulé entre la fin d'un cycle de cuisson et le début d'un cycle de nettoyage par pyrolyse, ainsi qu'une étape de comparaison de cette période de temps écoulé déterminé avec une période de temps prédéterminée.The method of cleaning by pyrolysis may further comprise a step of determining (not shown) the period of time elapsed between the end of a cooking cycle and the start of a cycle of cleaning by pyrolysis, as well as a step comparing this determined elapsed time period with a predetermined time period.

Lorsque la période de temps écoulé déterminée est inférieure à une période prédéterminée et que la température initiale Ti est supérieure ou égale à la température prédéterminée, la montée de température est mise en œuvre selon la seconde courbe de température temp2. When the determined elapsed time period is less than a predetermined period and the initial temperature Ti is greater than or equal to the predetermined temperature, the temperature rise is implemented according to the second temperature curve temp2.

Au contraire, lorsque la période de temps écoulé est supérieure à la période de temps prédéterminée, la montée de température est mise en œuvre selon la première courbe de température temp1. On the contrary, when the elapsed time period is greater than the predetermined time period, the temperature rise is implemented according to the first temperature curve temp1.

En effet, afin de bénéficier de l'inertie thermique du moufle, il est nécessaire que le cycle de nettoyage de pyrolyse soit effectué peu de temps après le cycle de cuisson.In fact, in order to benefit from the thermal inertia of the muffle, it is necessary for the pyrolysis cleaning cycle to be carried out shortly after the firing cycle.

En résumé, lorsque la température initiale de la cavité Ti est inférieure à la température prédéterminée, la montée de température dans le temps est mise en œuvre selon la première courbe de température temp1. In summary, when the initial temperature of the cavity T i is lower than the predetermined temperature, the temperature rise over time is implemented according to the first temperature curve temp1.

En particulier, lorsqu'un cycle de cuisson a été préalablement mis en œuvre mais que la température initiale de la cavité Ti est inférieure à la température prédéterminée, la montée de température dans le temps est mise en œuvre selon la première courbe de température temp1. In particular, when a cooking cycle has been implemented beforehand but the initial temperature of the cavity T i is lower than the predetermined temperature, the temperature rise over time is implemented according to the first temperature curve temp1 .

Lorsque le procédé de nettoyage par pyrolyse comprend l'étape de vérification de la température de cuisson Tu avec la température de cuisson prédéterminée, lorsque la température de cuisson Tu est inférieure à la température de cuisson prédéterminée, la montée de température dans le temps est mise en œuvre selon la première courbe de température temp1. When the pyrolysis cleaning process comprises the step of checking the cooking temperature T u with the predetermined cooking temperature, when the cooking temperature T u is lower than the predetermined cooking temperature, the temperature rise over time is implemented according to the first temperature curve temp1.

Le procédé de nettoyage par pyrolyse peut comprendre en outre une vérification du temps de cuisson, et comprend une vérification de la période de temps écoulée entre la fin d'un cycle de cuisson et le début d'un cycle de nettoyage par pyrolyse.The pyrolysis cleaning process may further include a cooking time check, and includes checking the time period between the end of a cooking cycle and the start of a pyrolysis cleaning cycle.

On notera que la température de cuisson dans un cycle de cuisson est d'au moins 140°C. Ainsi, le temps de cuisson équivaut au temps de cuisson pendant lequel la température de cuisson Tu est supérieure ou sensiblement égale à la température de cuisson prédéterminée.Note that the cooking temperature in a cooking cycle is at least 140 ° C. Thus, the cooking time is equivalent to the cooking time during which the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature.

Ainsi, lorsque le temps de cuisson d'un cycle de cuisson est inférieur à un temps de cuisson prédéterminé tc, la montée de température est mise en œuvre selon la première courbe de température temp1.Lorsqu'un cycle de cuisson a été mis en œuvre et que la température initiale Ti de la cavité 2 est supérieure ou sensiblement égale à la température prédéterminée et, que la température de cuisson Tu est supérieure ou sensiblement égale à la température de cuisson prédéterminée et/ou que le temps de cuisson est supérieur ou sensiblement égal au temps de cuisson prédéterminé tc, la montée de température dans le temps est mise en œuvre selon la seconde courbe de température temps 2.Thus, when the cooking time of a cooking cycle is less than a predetermined cooking time t c , the temperature rise is implemented according to the first temperature curve temp1. When a cooking cycle has been set. work and that the initial temperature T i of the cavity 2 is greater than or substantially equal to the predetermined temperature and that the cooking temperature T u is greater than or substantially equal to the predetermined cooking temperature and / or that the cooking time is greater than or substantially equal to the predetermined cooking time t c , the temperature rise over time is implemented according to the second temperature curve time 2.

Claims (19)

  1. A cooking appliance comprising a cavity (2) and means for implementing a cycle of cleaning by pyrolysis in which the temperature of the cavity increases from an initial temperature (Ti) to a pyrolysis temperature (Tp), the temperature rise over time being implemented according to a first temperature curve (temp1), representing the change in temperature over time, said cooking appliance (1) being characterized in that said means for implementing a pyrolysis cycle comprise means for checking the prior implementation of a cooking cycle comprising means for determining the period of time elapsed between the end of a cooking cycle and the start of the cycle of cleaning by pyrolysis and means for comparing said determined period of time with a predetermined period of time, said means for implementing a pyrolysis cycle further comprising comparison means for comparing said initial temperature (Ti) with a predetermined temperature, and being configured to implement said temperature rise over time according to said temperature curve (temp1) when the initial temperature (Ti) is less than said predetermined temperature and according to a second temperature curve (temp2) representing the temperature change over time when a cooking cycle has been implemented in advance and said initial temperature (Ti) is greater than or substantially equal to said predetermined temperature, said second temperature curve (temp2) comprising at least one substantially linear portion (temp2(1)) corresponding to a range of temperatures (IT), said portion (temp2(1)) having a slope (α2) of greater value than the value of the slope (α1) of a portion (temp1(1)) of said first temperature curve (temp1) corresponding to said range of temperatures (IT).
  2. A cooking appliance according to claim 1, characterized in that it comprises a catalyst (4) to neutralize the fumes produced in the cavity (2) during the cycle of cleaning by pyrolysis and in that said cycle of cleaning by pyrolysis comprises a first part (A1i-c, A2i-c) in which the temperature of the cavity (2) increases from said initial temperature (Ti) to an activation temperature (Tc) of said catalyst (4) and a second part (A1c-p, A2c-p) in which the temperature increases from said activation temperature (Tc) of the catalyst (4) to said pyrolysis temperature (Tp), said range of temperatures (IT) substantially corresponding to the second part (A1c-p, A2c-p) of the cycle of cleaning by pyrolysis.
  3. A cooking appliance according to one of claims 1 or 2, characterized in that it comprises an extractor fan (6) for extracting the fumes produced in the cavity (2) during the cycle of cleaning by pyrolysis, and actuation means of said extractor fan (6) configured to actuate said extractor fan (6) in operation to a rotational speed, said rotational speed of said extractor fan (6) being a function of the temperature of said cavity (2).
  4. A cooking appliance according to one of claims 1 to 3, characterized in that the means for implementing a cycle of cleaning by pyrolysis comprise heating means (7a, 7b, 8) configured such that the temperature of the cavity (2) increases according to a first temperature curve (temp1) or according to a second temperature curve (temp2).
  5. A cooking appliance according to one of claims 1 to 4, characterized in that said predetermined temperature is substantially equal to 100°C.
  6. A cooking appliance according to one of claims 1 to 5, characterized in that it is a cooking oven.
  7. A method of cleaning by pyrolysis for a cooking appliance (1) comprising a cavity (2) and implementing a cycle of cleaning by pyrolysis in which the temperature of the cavity increases from an initial temperature (Ti) to a pyrolysis temperature (Tp), said temperature rise over time being implemented according to a first temperature curve (temp1), representing the change in temperature over time, said method of cleaning by pyrolysis being characterized in that it comprises checking (E1) the prior implementation of a cooking cycle and comparing (E2) the initial temperature (Ti) with a predetermined temperature, said checking (E1) comprising a step of determining the elapsed period of time between the end of a cooking cycle and the start of the cycle of cleaning by pyrolysis, and a step of comparing said determined elapsed period of time with a predetermined period of time, said temperature rise over time being implemented according to said first temperature curve (temp1) when the said initial temperature (Ti) is less than said predetermined temperature and according to a second temperature curve (temp2) representing the temperature change over time when a cooking cycle has been implemented in advance and said initial temperature (Ti) is greater than or substantially equal to said predetermined temperature, said second temperature curve (temp2) comprising at least one substantially linear portion (temp2(1)) corresponding to a range of temperatures (IT), said portion (temp2(1)) having a slope (α2) of greater value than the value of the slope (α1) of a portion (temp1(1)) of said first temperature curve (temp1) corresponding to said range of temperatures (IT).
  8. A method of cleaning by pyrolysis according to claim 7, characterized in that said cycle of cleaning by pyrolysis comprises a first part (A1i-c, A2i-c) in which the temperature of the cavity (2) increases from said initial temperature (Ti) to an activation temperature (Tc) of a catalyst (4) neutralizing the fumes produced in the cavity (2) during the cycle of cleaning by pyrolysis, and a second part (A1c-p, A2c-p) in which the temperature increases from said activation temperature (Tc) of the catalyst (4) to said pyrolysis temperature (Tp), said range of temperatures substantially corresponding to the second part (A1c-p, A2c-p) of the cycle of cleaning by pyrolysis.
  9. A method of cleaning by pyrolysis according to one of claims 7 or 8, characterized in that it comprises actuating an extractor fan (6) for the fumes produced in the cavity (2) during the cycle of cleaning by pyrolysis, to a rotational speed that is a function of the cavity temperature (2).
  10. A method of cleaning by pyrolysis according to claim 9, characterized in that the actuation of the extractor fan (6) comprises putting said extractor fan (6) into operation at a minimum rotational speed when said cavity (2) is at said initial temperature (Ti), the rotational speed of said extractor fan (6) increasing when the temperature of said cavity (2) increases.
  11. A method of cleaning by pyrolysis according to one of claims 7 to 10, characterized in that it comprises the actuation in operation of the heating means for a predetermined period of time and at a predetermined power such that the temperature of the cavity (2) increases according to the first temperature curve (temp1) or the second temperature curve (temp2).
  12. A method of cleaning by pyrolysis according to one of claims 7 to 11, characterized in that said predetermined temperature is substantially equal to 100°C.
  13. A method of cleaning by pyrolysis according to one of claims 7 to 12, characterized in that the temperature rise over time is implemented according to the second temperature curve (temp2) when said determined period of time is less than a predetermined period.
  14. A method of cleaning by pyrolysis according to one of claims 7 to 13, characterized in that said checking of the prior implementation of a cooking cycle comprises comparing (E3) a cooking temperature (Tu) during said prior cooking cycle to a predetermined cooking temperature.
  15. A method of cleaning by pyrolysis according to claim 14, characterized in that the temperature rise over time is implemented according to said second temperature curve (temp2), when said determined cooking time (Tu) is greater than or substantially equal to the predetermined cooking temperature.
  16. A method of cleaning by pyrolysis according to one of claims 7 to 15, characterized in that said checking of the prior implementation of a cooking cycle comprises determining the cooking time (E4) of said cooking cycle, and comparing the determined cooking time with a predetermined cooking time.
  17. A method of cleaning by pyrolysis according to claim 16, characterized in that the temperature rise over time is implemented according to said second temperature curve (temp2), when said cooking time is greater than or substantially equal to the predetermined cooking time.
  18. A method of cleaning by pyrolysis according to one of claims 14 to 17, characterized in that said predetermined cooking temperature is substantially equal to 140°.
  19. A method of cleaning by pyrolysis according to one of claims 14 to 17, characterized in that several cooking cycles have been implemented in advance, each cooking cycle having an associated partial cooking time, said cooking times corresponding to the sum of said several partial cooking times when the temperature of the cavity (2) is greater than the predetermined temperature between the implementation of the cooking cycles.
EP16165786.1A 2015-04-21 2016-04-18 Cooking apparatus performing a pyrolytic cleaning cycle and corresponding cleaning method Active EP3086044B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1553555A FR3035482B1 (en) 2015-04-21 2015-04-21 COOKING APPARATUS EMPLOYING A PYROLYTIC CLEANING CYCLE

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EP3086044A1 EP3086044A1 (en) 2016-10-26
EP3086044B1 true EP3086044B1 (en) 2020-08-05

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EP16165786.1A Active EP3086044B1 (en) 2015-04-21 2016-04-18 Cooking apparatus performing a pyrolytic cleaning cycle and corresponding cleaning method

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EP (1) EP3086044B1 (en)
ES (1) ES2826724T3 (en)
FR (1) FR3035482B1 (en)

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Publication number Priority date Publication date Assignee Title
DE102021202127A1 (en) 2021-03-04 2022-09-08 BSH Hausgeräte GmbH Operating a pyrolysis-capable household cooking appliance

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Publication number Priority date Publication date Assignee Title
CN111412504B (en) * 2020-03-31 2022-04-29 佛山市顺德区美的洗涤电器制造有限公司 Starting detection method and device of cooking equipment, range hood and storage medium
DE102021110574A1 (en) * 2021-04-26 2022-10-27 Miele & Cie. Kg System comprising a cooking appliance with a cooking chamber and a fume extraction device, and method for operating a system

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DE3700136A1 (en) * 1987-01-03 1988-07-14 Gaggenau Werke Process for the pyrolytic cleaning of a baking oven
FR2673268A1 (en) * 1991-02-21 1992-08-28 Scholtes Ets Eugen Electric cooking oven for domestic use
DE4127389A1 (en) * 1991-08-19 1993-02-25 Bosch Siemens Hausgeraete COOKER WITH SENSOR CONTROLLED PYROLYSIS
DE4321952B4 (en) 1993-07-01 2004-05-27 BSH Bosch und Siemens Hausgeräte GmbH Stove with pyrolytic self-cleaning
GB2325299B (en) * 1997-05-16 2000-01-12 Creda Ltd Pyrolytic self-cleaning ovens
US6232584B1 (en) * 1999-12-15 2001-05-15 Whirlpool Corporation System for controlling a self cleaning oven having catalyst temperature control

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021202127A1 (en) 2021-03-04 2022-09-08 BSH Hausgeräte GmbH Operating a pyrolysis-capable household cooking appliance
WO2022184444A1 (en) 2021-03-04 2022-09-09 BSH Hausgeräte GmbH Method for operating a pyrolytic domestic cooking appliance

Also Published As

Publication number Publication date
EP3086044A1 (en) 2016-10-26
FR3035482A1 (en) 2016-10-28
FR3035482B1 (en) 2018-09-14
ES2826724T3 (en) 2021-05-19

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