EP1739360B1 - Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät - Google Patents

Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät Download PDF

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Publication number
EP1739360B1
EP1739360B1 EP06116154.3A EP06116154A EP1739360B1 EP 1739360 B1 EP1739360 B1 EP 1739360B1 EP 06116154 A EP06116154 A EP 06116154A EP 1739360 B1 EP1739360 B1 EP 1739360B1
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EP
European Patent Office
Prior art keywords
gas
gas burner
temperature
seconds
cooking
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Active
Application number
EP06116154.3A
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English (en)
French (fr)
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EP1739360A2 (de
EP1739360A3 (de
Inventor
Jean-Pierre Carmes
Frédéric DULUCQ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Groupe Brandt SAS
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Groupe Brandt SAS
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Publication date
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Publication of EP1739360A3 publication Critical patent/EP1739360A3/de
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Classifications

    • 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
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges
    • F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/20—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays
    • F23N5/203—Systems for controlling combustion with a time programme acting through electrical means, e.g. using time-delay relays using electronic means

Definitions

  • the present invention relates to a gas cooking oven, and preferably a gas domestic cooking oven.
  • the present invention relates to the operation of a domestic gas cooking oven during a heating program.
  • a domestic gas cooking oven comprises a muffle, one or more gas burners being adapted to heat the air contained in the muffle.
  • These burners are generally arranged under the bottom wall or the top wall of the muffle.
  • the temperature of the air contained in the muffle is generally regulated by a thermostat controlling a gas flow control valve supplying the gas burner.
  • This valve makes it possible to increase or decrease the gas flow supplying the gas burner by constantly being lit. This is particularly the case of the patent application FR2308868 which describes such a device.
  • the patent application is also known FR2312750 which describes a method of controlling the temperature of a gas oven operating in all or nothing where the gas burner is fed continuously until the desired temperature and then to apply a predetermined program.
  • the object of the present invention is to propose a method of temperature regulation in a gas domestic cooking oven making it possible to regulate the temperature of the cooking chamber precisely with respect to the set temperature, to eliminate the risks of extinction.
  • Said temperature regulation of the cooking chamber makes it possible to manage the operating and rest times of the at least one gas burner. This method allows the ignition of the at least one gas burner sequentially and without risk of not burning a portion of the feed gas for heating the cooking chamber.
  • the present invention provides a temperature control method in a domestic gas cooking oven comprising a muffle whose front face is closed by a door, and comprising an upper wall, side walls, a bottom wall and a bottom wall, and at least one gas burner disposed under the bottom wall of said muffle fed all or nothing.
  • this temperature control method in a domestic gas cooking furnace comprises phases of a heating program divided into S time unit sequences.
  • the duration of operation of the at least one gas burner during sequences of duration S being at the maximum of the duration of the time unit sequences S and a minimum operating time of at least 10 seconds of the at least one gas burner is the condition necessary to ensure its complete ignition so as not to release unburned gas into the cooking chamber.
  • the heating of the air contained in the muffle is regulated by putting into operation and stopping at least one gas burner and not by a change in gas flow rate supplying said at least one gas burner.
  • This temperature control method allows to cut a heating program in unitary sequences to regulate the temperature over short periods.
  • Said unitary sequences make it possible to manage the operation of the at least one gas burner differently according to each heating phase of a cooking program.
  • the operating and resting times of the at least one gas burner may be different during the rise in temperature or the maintenance of the temperature in the oven cooking chamber, as well as during the different phases of a program cleaning by pyrolysis.
  • Each unitary sequence optimally controls the operating and resting time of the at least one gas burner.
  • This control method has the advantage of eliminating the risk of malfunction of the at least one gas burner related to ignition and extinguishing at close time intervals.
  • Said at least one gas burner operates for at least a definite period of time to guarantee its complete ignition. In this way, any partial combustion of the gas supplying the at least one gas burner is avoided.
  • the at least one gas burner operates continuously for at least one unit time sequence. This continuous operation can be repeated on several successive unitary sequences so as to dissipate a maximum power during a period of the heating program.
  • the rest time of said at least one gas burner during time unit sequences S is at least 8 seconds, and preferably of the order of 20 seconds.
  • the rest period after a period of operation of the at least one gas burner ensures the ignition thereof without risk of not completely burn the gas supplying the cooking appliance.
  • this rest period is not respected, the volatile organic compounds emitted by the combustion of the gas of said at least one gas burner may impair the ignition thereof.
  • This domestic cooking appliance 1 is such that a range comprising a domestic gas cooking oven.
  • the domestic gas cooking oven 1 can also be intended to be integrated in a built-in cabinet.
  • This oven 1 comprises a muffle 2 for receiving the food to be cooked.
  • the front face 3 of the muffle 2 is closed by a door 4, and comprises an upper wall 5, side walls 6, a bottom wall 7 and a bottom wall 8.
  • Said oven 1 also comprises at least one heating means 9 placed under the bottom wall 8 of said muffle 2.
  • the heating means 9 placed under the bottom wall 8 of the muffle 2, as illustrated in FIG. figure 2 is an all-or-nothing gas burner.
  • the muffle 2 could also include several burners 9 below the bottom wall 8 of the muffle 2.
  • the domestic gas cooking oven 1 may also comprise an ignition burner (not shown) adapted to ignite the at least one gas burner 9.
  • the muffle 2 also comprises in this embodiment an electric heating element 10 fed in all or nothing disposed under the top wall 5 of the muffle 2.
  • This heating element 10 makes it possible to raise the temperature of the muffle more quickly in cooking mode and to activate at least one catalytic cell 16 as quickly as possible to remove the volatile organic compounds.
  • the upper wall 5 of the muffle 2 comprises an opening 15 adapted to receive In this way, the combustion gases called volatile organic compounds are not discharged directly outside the domestic gas cooking oven 1. But said volatile organic compounds pass through said catalytic cell 16 coated with palladium or carbon dioxide. platinum. Such a catalytic cell 16 functions by cracking the hydrocarbons.
  • a catalytic cell 16 may be of cylindrical or parallelepipedal shape. In the embodiment described, the catalytic cell 16 has a diameter of the order of 30 mm.
  • the treatment of the volatile organic compounds requires a heating means to raise the temperature of the catalytic cell 16 to eliminate said volatile organic compounds emitted in the muffle 2 of the domestic gas cooking oven 1.
  • This heating means is the element electric heater 10 located below the upper wall 5 of the muffle 2.
  • the domestic gas cooking oven 1 comprises control means adapted to turn on and off the gas burner 9 and the electric heating element 10 so as to regulate the temperature of the air contained in the muffle 2 as a function of a set temperature T.
  • phases of a heating program are divided into S time unit sequences.
  • the heating program is divided into unitary time sequences S making it possible to regulate the temperature of the cavity with great precision since the unitary sequences are of short duration.
  • the unit time sequences S are in a range extending between 10 seconds and 1 minute, and preferably of the order of 30 seconds.
  • the unitary time sequences S of said at least one gas burner 9 can take any value between 10 seconds and 1 minute.
  • Said time unit sequences S make it possible to decompose the steps of the cooking program so as to perform an evolutionary regulation.
  • the operation of said at least one gas burner may be different.
  • Each temporal unit sequence S may take a different value from the preceding and following sequence so as to regulate as closely as possible the temperature of the cooking chamber relative to the set temperature.
  • the durations of the time unit sequences S are variable and adjustable according to the data collected by the control means of the domestic gas cooking oven 1.
  • the variation of the duration of the time unit sequences S can be managed by a microprocessor.
  • This microprocessor can make it possible to vary the duration of the time unit sequences S according to preprogrammed recorded data
  • said at least one gas burner 9 can be used to regulate the temperature of the cooking chamber according to three temperature thresholds.
  • the temperature of the cooking chamber is 20 ° C lower than the set temperature T.
  • said at least one gas burner 9 operates in continuous mode, that is to say that the operating time of said at least one gas burner is 30 seconds during one or more unit time sequences S, each duration of 30 seconds.
  • the temperature of the cooking chamber is between 5 ° C and 20 ° C below the set temperature T.
  • said at least one gas burner 9 operates in sequential mode, c ' that is to say that the operating time of said at least one gas burner is 10 seconds during one or more unit time sequences S each duration of 30 seconds.
  • the at least one gas burner is first in operation for 10 seconds and then is stopped for 20 seconds.
  • the temperature of the cooking chamber is 5 ° C lower than the set temperature T. Then, said at least one gas burner 9 is not lit.
  • said microprocessor can also make it possible to vary the duration of the time unit sequences S according to data collected by servocontrol means of the domestic gas cooking furnace by using, for example, servocontrols well known to those skilled in the art such as those denoted by proportional, integral proportional or proportional integral derivative.
  • the operating time of the at least one gas burner 9 during time unit sequences S is at least 10 seconds.
  • the minimum operating time of the at least one gas burner 9 can not be reduced once the unitary time sequence S is started. In the case where this condition is not respected, malfunctions occur during the ignition and / or extinguishing of the at least one gas burner 9.
  • the duration of operation of the at least one gas burner 9 during sequences of duration S is at the maximum of the duration of the time unit sequences S.
  • said at least one gas burner 9 may not operate, be lit for 10 seconds or be turned on for 30 seconds.
  • This operating principle of said at least one gas burner 9 makes it possible to temperature regulation of the cooking chamber of the domestic gas cooking oven.
  • the electric heating element 10 is not necessary for carrying out this method of controlling the temperature of a heating program in a domestic gas cooking oven 1.
  • the regulation of the at least one gas burner 9 can make it possible to carry out all the programs provided in a domestic cooking oven.
  • the electric heating element 10 may be replaced by a gas burner.
  • Said at least one gas burner 9 can be extinguished since the electric heating element 10 is sufficient for the heating program or in the case of a cooking commonly called grill.
  • the ignition of the at least one gas burner 9 depends on the temperature of the cooking chamber and the cycle phase of the heating program.
  • control means detect a temperature too high in the cooking chamber, said at least one gas burner is cut.
  • the minimum operating time of the at least one gas burner 9 is the necessary condition to ensure its complete ignition so as not to release unburned gas into the cooking chamber. This stage of the process allows the treatment of unburned gases and ensures the user a safe operation of the domestic gas cooking oven.
  • the operating times of the at least one gas burner 9 take the values of 10 or 30 seconds for reasons of simplicity in managing the control of the domestic gas cooking oven 1.
  • the time unit sequences S are executed consecutively and without interruption.
  • the unitary time sequences S follow each other without any time period not being managed by the control means.
  • the heating means of the domestic gas cooking furnace operate continuously for at least two time unit sequences without there being a stopping period of at least one heating means during the sequence of said at least two time unitary sequences.
  • the unitary time sequences S make it possible to control the heating means of the domestic gas cooking oven 1 throughout a program so as to be able to give different instructions for each of these sequences.
  • the stopping of the time unit sequences S is at least 8 seconds for a sequential mode operation of the at least one gas burner 9, and preferably of the order of 20 seconds.
  • the stopping time of the at least one gas burner can take any value between 8 and 20 seconds when the duration of a unitary time sequence S is 30 seconds.
  • Said at least one gas burner 9 must be left at rest for a minimum time between two ignitions so as not to generate a quantity of volatile organic compounds that is too great in the cooking chamber. If this amount of volatile organic compounds is too great, said at least one gas burner 9 may encounter ignition difficulties.
  • Said rest time of the at least one gas burner 9 is a safety means to ensure the proper operation of said at least one gas burner 9 so that unburned gas is released in the cooking chamber.
  • said at least one gas burner may be extinguished to operate in sequential mode. This method of operation makes it possible to regulate the temperature of the cooking chamber of the domestic gas cooking oven 1.
  • Said at least one gas burner 9 is cut for at least a period of 8s during a unitary time sequence S, it is the time necessary to ensure the correct ignition of said at least one gas burner 9 during the sequential unitary sequence S next. If this rest period is not respected, volatile organic compounds are present in an environment close to the at least one gas burner 9 and cause adverse reactions to the combustion of the gas released by the control means.
  • the process starts with a first phase triggering the start of a phase of a heating cycle in the muffle 2 of the baking oven.
  • domestic gas 1. This departure can be the start of a departure from a program selected by the user or the delayed start.
  • the electric heating element 10 operates for at least a duration D1 at a maximum power.
  • the electric heating element 10 is operated sequentially during sequences of duration S1 during the first step of the process corresponding to a cooking cycle.
  • Said first step of operation of the at least one gas burner 9 and the electric heating element 10 corresponds to the preheating phase of the muffle 2.
  • Operation at maximum power of the electric heating element 10 activates the catalytic cell 16 as soon as possible.
  • the rise in temperature of the catalytic cell is rapid because the electric heating element 10 is close to said catalytic cell 16.
  • the distance between the catalytic cell 16 and the electric heating element 10 is between 30 mm and 15 mm, and preferably of the order of 20 mm.
  • the catalytic cell 16 is located between two branches of the electric heating element 10.
  • the two branches of the electric heating element 10 are preferably spaced apart by a distance of the order of 55 mm.
  • the catalytic cell 16 can begin to process the volatile organic compounds before the domestic gas cooking oven 1 is at the set temperature T.
  • this temperature control method makes it possible to use a gas burner 9 from the beginning of the firing cycle while having very satisfactory results for the treatment of volatile organic compounds.
  • the operating sequences S1 during the operating time D1 of the electric heating element 10 are in a range extending from 5 seconds to 1 minute, and preferably of the order of 25 seconds.
  • the regulation of the temperature of the air contained in the muffle 2 during the first step of the heating cycle is achieved by the operating time of the gas burner 9.
  • the electric heating element 10 is operated with an offset of a duration D4 with respect to the operation of the gas burner 9 during the first step of the process of a cooking cycle.
  • the heating element 10 is operated with a delay of a duration D4 extending in a range between 1 and 30 seconds, preferably of the order of 2 seconds.
  • the set temperature T is between 35 and 300 ° C during a cooking program in said domestic gas cooking oven 1.
  • a second step of stopping the operation of the at least one gas burner 9 is performed for a duration D2.
  • the shutdown time D2 of the at least one gas burner 9 is in a range of 1 to 8 minutes.
  • the electric heating element 10 is stopped for a duration identical to the shutdown duration D2 of the at least one gas burner 9 during the second step.
  • a third stage of continuous operation of the at least one gas burner 9 is launched for a duration D3.
  • the operating time D3 of the at least one gas burner 9 is in a range from 30 seconds to 8 minutes.
  • the electric heating element 10 is operated simultaneously with said at least one gas burner 9. These two heating means 9 and 10 are preferably operated simultaneously for the third stage of the process.
  • the next step of the program is the repetition of the second and third steps performed consecutively during a complete cycle of a cooking program.
  • the operating time D3 of the at least one gas burner 9 is divided into sequences of duration S2.
  • the duration of the sequence S2 extends in a range of between 20 seconds and 2 minutes, and preferably of the order of 30 seconds.
  • At least two sequences of duration S2 can be produced without interruption of the at least one gas burner 9, and preferably eight S2 sequences.
  • the electric heating element 10 operates proportionally with respect to the at least one gas burner 9 so as to respect the set temperature T.
  • the proportional operating time of the heating element 10 with respect to the operating time D1 or D3 of the at least one gas burner 9 is managed by the control means of the domestic cooking oven 1.
  • the control means evaluate the temperature difference between the set temperature T and the value measured by means of a temperature probe. This measured temperature difference allows the control means to supply the electric heating element 10 for the time necessary to maintain the cooking oven 1 at the set temperature T and to avoid large fluctuations around said set temperature T.
  • This principle is also used during the temperature rise phase of the cooking oven 1 during the first step.
  • a theoretical temperature rise curve of the cooking chamber is stored by the control means.
  • This temperature rise curve is a ramp. It has the particularity to end with an asymptote to eliminate any risk of excessive temperature rise during a malfunction of the device.
  • This learning mode of the baking oven 1 is performed in the laboratory by the Applicant.
  • a maximum operating time threshold of the electric heating element 10 is determined in the operating parameters of the control means. This operating time is between 15 seconds and 2 minutes and preferably of the order of 25 seconds.
  • control means evaluate the temperature difference between the setpoint and the measured value and adapt this operating time accordingly.
  • the management of said operating periods can be performed by a microprocessor having fixed durations for each cooking program or by automatic cooking means.
  • the electric heating element 10 operates sequentially during sequences of duration S3 during the third step of the method.
  • the operating sequences S3 during the operating time D3 of the electric heating element 10 are in a range extending from 10 seconds to 1 minute, and preferably of the order of 25 seconds.
  • the muffle 2 comprises a temperature probe (not shown) adapted to measure the furnace center temperature.
  • This temperature probe is connected to control means adapted to switch on and off the gas burner 9 and the electric heating element 10 so as to regulate the temperature of the air contained in the muffle 2 as a function of a heating temperature. setpoint T.
  • the catalytic cell 16 makes it possible to eliminate almost all the emissions of toxic volatile organic compounds from a rise in temperature of the catalytic cell of the order of 200 ° C.
  • This temperature control process makes it possible to respond very favorably to the normative requirements concerning emissions of carbon monoxide and carbon dioxide. This process makes it possible to treat almost all the volatile organic compounds emitted during a cooking cycle.
  • the temperature control method provides a product that performs well in terms of safety vis-à-vis the user since the air released into the kitchen is devoid of toxic gases.
  • the state of the art gas cooking apparatus did not make it possible to obtain such good volatile organic compound treatment performances and to guarantee the safety of the users since said apparatus did not have a catalytic cell 16 and a temperature control method as described above.
  • the catalytic cell 16 is partially activated since the total activation temperature of the catalytic cell has not yet been reached.
  • the domestic gas cooking oven 1 as described above thus allows a treatment of volatile organic compounds emitted in the muffle during a cooking program.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Regulation And Control Of Combustion (AREA)
  • Baking, Grill, Roasting (AREA)

Claims (5)

  1. Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät, umfassend eine Muffel (2), deren Frontseite (3) durch eine Tür (4) verschlossen ist, und aufweisend eine obere Wand (5), Seitenwände (6), eine Rückwand (7) und eine untere Wand (8) sowie mindestens einen unter der unteren Wand (8) der Muffel (2) angeordneten Gasbrenner (9) mit Ein-Aus-Versorgung, wobei bei dem Verfahren Phasen eines Heizprogramms in Zeiteinheitssequenzen (S) unterteilt sind, wobei die Betriebsdauer des mindestens einen Gasbrenners (9) während Sequenzen einer Dauer (S) dem Maximum der Dauer der Zeiteinheitssequenzen (S) entspricht, dadurch gekennzeichnet, dass eine minimale Betriebszeit von mindestens gleich 10 Sekunden des mindestens einen Gasbrenners (9) die notwendige Bedingung für die Rückversicherung seiner vollständigen Zündung ist, damit kein nicht verbranntes Gas in den Garraum freigesetzt wird.
  2. Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät nach Anspruch 1, dadurch gekennzeichnet, dass die Zeiteinheitssequenzen (S) in einem Bereich liegen, der sich zwischen 10 Sekunden und 1 Minute erstreckt und vorzugsweise zirka 30 Sekunden beträgt.
  3. Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät nach einem der Ansprüche 1 bis 2, dadurch gekennzeichnet, dass die Zeiteinheitssequenzen (S) nacheinander und ohne Unterbrechung ausgeführt werden.
  4. Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der mindestens eine Gasbrenner (9) während einer minimalen Zeit von mindestens gleich 8 Sekunden zwischen zwei Zündungen in Ruhe verbleiben muss, um eine korrekte Zündung des mindestens einen Gasbrenners (9) während der nächsten Zeiteinheitssequenz (S) sicherzustellen.
  5. Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Ruhezeit des mindestens einen Gasbrenners (9) während der Zeiteinheitssequenzen (S) mindestens 8 Sekunden für einen Betrieb im sequentiellen Modus und vorzugsweise zirka 20 Sekunden beträgt
EP06116154.3A 2005-06-30 2006-06-27 Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät Active EP1739360B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0506746A FR2887963B1 (fr) 2005-06-30 2005-06-30 Procede de regulation de temperature d'un programme de chauffage dans un four de cuisson domestique a gaz

Publications (3)

Publication Number Publication Date
EP1739360A2 EP1739360A2 (de) 2007-01-03
EP1739360A3 EP1739360A3 (de) 2017-05-24
EP1739360B1 true EP1739360B1 (de) 2019-04-03

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EP06116154.3A Active EP1739360B1 (de) 2005-06-30 2006-06-27 Verfahren zur Temperatursteuerung eines Heizprogramms in einem Haushaltsgaskochgerät

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EP (1) EP1739360B1 (de)
FR (1) FR2887963B1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2308868A1 (fr) * 1975-04-24 1976-11-19 Gaz De France Dispositif pour le chauffage ou la cuisson par generateur de chaleur a combustible gazeux
FR2312750A1 (fr) * 1975-05-30 1976-12-24 Gaz De France Procede de traitement thermique et four a combustible gazeux ou liquide
JPS5883128A (ja) * 1981-11-12 1983-05-18 Matsushita Electric Ind Co Ltd 加熱調理器
AU1433201A (en) * 1999-10-18 2001-04-30 Allen Olson Electronic gas cooktop control with simmer system and method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
FR2887963A1 (fr) 2007-01-05
FR2887963B1 (fr) 2017-10-06
EP1739360A2 (de) 2007-01-03
EP1739360A3 (de) 2017-05-24

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