EP3303955B1 - Domestic appliance comprising a differential pressure sensor - Google Patents

Domestic appliance comprising a differential pressure sensor Download PDF

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Publication number
EP3303955B1
EP3303955B1 EP16723736.1A EP16723736A EP3303955B1 EP 3303955 B1 EP3303955 B1 EP 3303955B1 EP 16723736 A EP16723736 A EP 16723736A EP 3303955 B1 EP3303955 B1 EP 3303955B1
Authority
EP
European Patent Office
Prior art keywords
pressure
door
controller
household appliance
pressure profile
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16723736.1A
Other languages
German (de)
French (fr)
Other versions
EP3303955A1 (en
Inventor
Stephan Kempfle
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.)
BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Publication date
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Publication of EP3303955A1 publication Critical patent/EP3303955A1/en
Application granted granted Critical
Publication of EP3303955B1 publication Critical patent/EP3303955B1/en
Active legal-status Critical Current
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/70—Power-operated mechanisms for wings with automatic actuation
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/60—Power-operated mechanisms for wings using electrical actuators
    • E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • E05F15/611—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for swinging wings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • F25D17/047—Pressure equalising devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D23/00—General constructional features
    • F25D23/02—Doors; Covers
    • F25D23/028—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices
    • F25D29/005—Mounting of control devices
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/20—Brakes; Disengaging means; Holders; Stops; Valves; Accessories therefor
    • E05Y2201/218—Holders
    • E05Y2201/22—Locks
    • E05Y2201/221—Touch latches
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/20—Brakes; Disengaging means; Holders; Stops; Valves; Accessories therefor
    • E05Y2201/23—Actuation thereof
    • E05Y2201/232—Actuation thereof by automatically acting means
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/404—Function thereof
    • E05Y2201/422—Function thereof for opening
    • E05Y2201/426—Function thereof for opening for the initial opening movement
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/43—Motors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
    • E05Y2400/10—Electronic control
    • E05Y2400/30—Electronic control of motors
    • E05Y2400/3013—Electronic control of motors during manual wing operation
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
    • E05Y2400/10—Electronic control
    • E05Y2400/44—Sensors not directly associated with the wing movement
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/30—Application of doors, windows, wings or fittings thereof for domestic appliances
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/30—Application of doors, windows, wings or fittings thereof for domestic appliances
    • E05Y2900/31—Application of doors, windows, wings or fittings thereof for domestic appliances for refrigerators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/02—Sensors detecting door opening

Definitions

  • the present invention relates to a household appliance with a door opening aid.
  • the publication DE 10 2006 061 083 A1 describes a refrigerator with a door opening help.
  • Electronic door opening aids are often used in modern home appliances, such as domestic refrigerators, to actively assist a user-initiated door opening operation. For this purpose, however, it is necessary to detect a door opening request of the user.
  • a differential pressure sensor can be used, which detects a push on the door in a push opening operation and a pull on the door in a pull opening operation.
  • An exemplary differential pressure sensor is in the document EP 1790252 B1 described.
  • the present invention is based on the finding that the above object can be achieved by monitoring a plurality of pressure values output by a differential pressure sensor.
  • the pressure curve instead of a single pressure value can be used to detect the door opening request.
  • the present invention is based on the further finding that a door closure in the outer region of the household appliance can cause pressure fluctuations, which can lead to a false triggering of a door opening aid when using a differential pressure sensor.
  • a door closure in the outer region of the household appliance can cause pressure fluctuations, which can lead to a false triggering of a door opening aid when using a differential pressure sensor.
  • Such fluctuations can be throttled or damped. This reduces the likelihood of false triggering of a door opening aid due to outside pressure fluctuations.
  • the invention relates to a household appliance having a body, a door for closing an interior, a differential pressure sensor with a sensor membrane for detecting a pressure difference between an internal air pressure in the interior and an external air pressure in an outdoor space, a door opening aid for assisting the door opening operation, and a Controlling the door opening aid as a function of the detected pressure difference, wherein the controller is designed to detect a pressure profile of the pressure difference and to control the door opening aid in dependence on the detected pressure profile.
  • the pressure profile is determined by the pressure output values of the differential pressure sensor, for example within a predetermined time interval of 100 ms, 500 ms or 1 s.
  • the decision to activate the door opening aid will therefore not be based on a single pressure value, but rather on the basis of a pressure curve, i. based on a pressure waveform.
  • the control comprises the activation of the door opening aid, the deactivation of the door opening aid, the non-activation of the door opening aid and the enhancement of the effect of the door opening aid.
  • the controller is configured to activate the door opening aid if the detected pressure profile extends within a predetermined pressure course corridor.
  • the pressure-course corridor can be determined, for example, by a lower pressure curve boundary and by an upper pressure curve boundary, which are predetermined. Runs the pressure curve within these limits and thus within the thus predetermined pressure course corridor, so it can be assumed that there is a door opening request and the door opening help can be activated.
  • the pressure gradient corridor may be different for different door opening variants.
  • an opening operation push
  • an increase in pressure is to be assumed when the door is pressed by a user. After releasing the door by the user, however, the pressure drops.
  • the pressure curve may, for example, be linearly increasing up to a pressure peak value, which represents a maximum pressure value. Upon reaching the maximum pressure value, i. immediately after releasing the door, for example, the pressure drops linearly. If such a pressure profile is detected, the door opening aid is activated.
  • the pressure detected by means of the differential pressure sensor reduces linearly during the pulling phase, which results in a negative pressure gradient. If such a negative pressure curve is detected within the pressure curve corridor, it can also be assumed in the case of the train opening variant that a door opening request is present, so that the door opening aid can be activated.
  • the controller is configured to compare a slope of the sensed pressure profile to at least one gradient threshold to determine if the sensed pressure profile is within a predetermined pressure course corridor, and to activate the door opening assist only if the sensed pressure profile is within the predetermined pressure waveform corridor lies.
  • the gradient threshold value can be determined, for example, by a lower pressure profile boundary and / or by an upper pressure profile boundary.
  • the slope of the gradient threshold value in the first pressure progression phase is positive and then drops off with a negative gradient.
  • the slope threshold has a negative slope from the beginning.
  • the controller is designed to detect a change in the gradient of the detected pressure profile and to activate the door opening aid in the presence of the gradient reversal.
  • the reversal is expected, as stated above, in a push variant and occurs immediately after releasing the door.
  • the slope reversal is determined by a maximum pressure value which can also be detected. As a result, the door opening request is detected at a push opening in a particularly simple and secure manner.
  • the controller is configured to detect a positive slope of the detected pressure profile up to the slope reversal and a negative slope of the detected pressure curve after the slope reversal and to activate the door opening aid only if the positive slope of the pressure curve and the negative slope of the pressure curve within lie of a predetermined pressure course corridor.
  • the controller is configured to detect a positive slope of the detected pressure profile up to the slope reversal and a negative slope of the detected pressure curve after the slope reversal and to activate the door opening aid only if the positive slope of the pressure curve and the negative slope of the pressure curve within lie of a predetermined pressure course corridor.
  • the controller is configured to activate the door opening aid with an increase in a slope of the detected pressure curve or to increase its effect.
  • the pull variant is considered in a particularly advantageous manner, in which the pressure difference and thus the slope of the detected pressure curve are negative.
  • the door opening aid in the pull variant can be activated if an absolute value of the detected, negative pressure difference is exceeded.
  • the controller is configured to activate the door opening aid if the pressure profile with negative pressure difference values falls below the pressure course corridor.
  • the door opening request is advantageously detected in the pull opening variant, in which the pressure difference values due to the pressure exerted on the door from the beginning are negative, so that the pressure curve has a negative slope from the beginning.
  • the sensor membrane has a first membrane side facing the interior and a second membrane side facing away from the interior, and the second membrane side is surrounded by a pressure throttle chamber, and the pressure throttle chamber is designed to at least partially throttle the outside air pressure.
  • the differential pressure sensor is arranged in a body.
  • the differential pressure sensor can also be arranged in any area of the body.
  • the pressure throttle chamber encloses the second membrane side at least partially or completely.
  • the possibility of a slow pressure equalization between the interior of the pressure throttle chamber and the environment of the pressure throttle chamber is effected.
  • the pressure acting on the second membrane side air pressure can be adapted to atmospheric air pressure fluctuations.
  • a reference system with an always constant pressure is provided by the pressure restrictor chamber.
  • the pressure throttle chamber is designed to provide a reference pressure or to throttle the external air pressure.
  • the pressure throttle chamber on a pressure throttle element in particular a throttle opening or a throttle stage, which is provided for a monotone pressure equalization between an interior of the pressure throttle chamber and the outer space. Due to the monotonous pressure equalization on the one hand achieved that an adjustment of the air pressure in the interior of the pressure throttle chamber can be adapted to atmospheric fluctuations of the air pressure outside the pressure throttle chamber. At the same time non-monotonous, ie abrupt slopes of the pressure are not passed on to the second membrane side.
  • the controller has a control board with an electrical circuit, and the control board forms a wall of the pressure throttle chamber or closes off the pressure throttle chamber.
  • the board can for example form a lid of the pressure throttle chamber, which is always to be assumed by the design of the board that, for example due to the via contacts in the board openings are present, which can be exploited as throttle openings, whereby at least partial pressure throttling can be achieved , At the same time less space is needed because the board can not be accommodated in a separate location.
  • the connection lines to the board can be made shorter, resulting in a saving of material.
  • the side walls of the throttle chamber, on which the serving as a lid board can rest can be formed for example by air seals or other walls. Another advantage of this embodiment is that smaller openings are tolerable, because they act as throttle openings. As a result, the production cost is reduced.
  • the door is manifested by a mechanical pressure on the door
  • the controller is adapted to activate the door opening aid upon an increase in the detected pressure difference, or the door is revealed by a mechanical pull on the door
  • the control is designed to activate the door control with a reduction in the detected pressure difference.
  • the invention relates to a method of controlling an activatable door opening aid for assisting opening of a door in a household appliance comprising a body, a door for closing an interior space, a differential pressure sensor with a sensor membrane for detecting a pressure difference between an internal air pressure in the interior space and an external air pressure outside the outer space, wherein a pressure curve of the pressure difference within a Time interval is detected and wherein the door opening aid is activated in dependence on the detected pressure profile.
  • the controller activates the door opening aid only if the detected pressure profile extends within a predetermined pressure course corridor.
  • Fig. 1 schematically shows a household appliance 100, which may be, for example, a household refrigerator.
  • the household appliance 100 has a body 101 and a door 103 which closes the interior 105 of the body 101.
  • an electric door opening aid 107 is provided to assist a door opening operation.
  • the door opening aid 107 may have an actuator which assists the door opening initiated by a user.
  • the differential pressure sensor 106 has a sensor membrane 109, which has a first membrane side 109-1 and a second membrane side 109-2.
  • the first diaphragm side 109-1 faces the inner space 105 and is exposed to the internal air pressure in the inner space 105.
  • the first membrane side 109-1 can be arranged in a pressure chamber 110, which in Fig. 1 shown schematically and the internal pressure in the interior 105 is directly exposed.
  • the second membrane side 109-2 is arranged in a throttle chamber 111, which is provided to at least partially throttle an external air pressure.
  • a throttle chamber 111 which is provided to at least partially throttle an external air pressure.
  • the second membrane side 109-2 is exposed to a throttled external air pressure, so that abrupt pressure fluctuations, which occur, for example, when the door 103 closes, do not directly affect the pressure measurement.
  • the throttle chamber 111 may be fully closed, thereby providing a reference pressure inside the throttle chamber.
  • the throttle chamber 111 does not have to be completely closed, but it may, for example, have one or more pressure compensation openings to allow a slow pressure equalization in, for example, atmospheric fluctuations in the external air pressure. In both cases, throttling reduces a direct environmental impact on the sensor membrane 109, thereby avoiding pressure error detections.
  • the throttled differential pressure sensor 106 can adjust to the ambient pressure. In this way, a high resolution is achieved, which may for example be in a resolution range of 0.001 mbar. By throttling, the operating range of the differential pressure sensor 106 can be limited to a small pressure range, allowing the increased resolution. With the throttled pressure compensation, the differential pressure sensor 106 thus always operates in or around the zero point in the resolution range and does not drift out of the measuring range at higher ambient pressures.
  • the household appliance 100 further comprises a controller 113, which controls the door actuator 107, for example, activated.
  • the controller 111 is arranged on a circuit board, which closes off the pressure throttle chamber 111 as a cover.
  • Fig. 2 shows an exemplary pressure curve 201, which has a first pressure gradient section 201-1 with a positive slope and a second pressure gradient section 201-2 with a negative slope.
  • the pressure curve 201 further has a gradient reversal point 203, which is determined by a detected pressure maximum value.
  • the pressure profile 201 is a differential pressure signal, which results, for example, in the push variant at an opening request, in which a user presses the door to initiate an opening process.
  • the first pressure profile section 201-1 is formed in the phase of pressing until the maximum pressure 203 is reached.
  • the second pressure profile section 201-2 results when the door 103 is released and the associated reduction in the differential pressure.
  • the controller 113 is preferably designed to detect the pressure curve 201 and, depending on the detected pressure curve, to control the door opening aid 107, for example to activate it.
  • the controller 113 may be configured to form a continuous averaging of the differential pressure provided by the differential pressure sensor 106, whereby a signal slope may be monitored.
  • a signal slope may be monitored.
  • the exemplary pressure profile section 201-1 results, while with a negative signal gradient, ie with a drop in the differential pressure, the second pressure profile section 201-2 results.
  • the sensor signal provided by the differential pressure sensor 106 which indicates a plurality of pressure values and thus indicates the pressure profile 201, can be digitized.
  • an analysis can be carried out as to whether the pressure profile, that is to say for example the gradient, runs within predetermined limits 205 and 207.
  • the boundary 205 is a lower pressure gradient boundary
  • the boundary 207 is an upper pressure gradient boundary.
  • the boundaries 205 and 207 define a pressure-course corridor in which the pressure curve 201 is intended to run so that the door-opening aid 107 is activated.
  • the maximum pressure value 203 i. a differential pressure peak
  • the boundaries 205, 207 i. the pressure-course corridor, an envelope. If the pressure curve 201 is within the envelope, then the door opening aid 107 can be activated, as a result of which an actuator is started.
  • the actuator can be started at a staggered time, whereby a movement sequence of a user is taken into account.
  • the pressure-course corridor 205, 207 can, according to one embodiment, take into account further gradients, for example pressure signal overshoots of the door or pressure signal increase changes, in order to further minimize false triggering of the door-opening aid 107.
  • an opening request detection takes place within a range of, for example, 0.2 s or even faster.
  • a superimposed pressure difference as it is, for example, in a negative pressure build-up after a door closing, and which may be accompanied by a slow change in the pressure difference, be taken into account.
  • This consideration can be done, for example, by a shift of the differential pressure differential value or the limits 205, 207, whereby an adaptation of the pressure gradient corridor to given conditions can be achieved.
  • the opening and closing of the door 103 can also be detected.
  • the lower limit 205 and the upper limit 207 each have a differential pressure differential 208, 210, which in each case indicates a gradient reversal point 203.
  • Fig. 3 shows a differential pressure curve 301, which results in the pull scenario in which the door 103 is opened by a train on the door 103.
  • the slope of the differential pressure is negative, which is in Fig. 3 is expressed by the illustrated negative pressure values ⁇ p.
  • the pressure course corridor is here given by the lower pressure curve boundary 303 and the upper pressure curve boundary 305, which each have negative slopes.
  • the door opening aid 107 is activated.
  • a stronger slope of the differential pressure curve 301-1, the activation of the door opening aid 107, so the effect of an additional actuator support, indicate, for example, as long as a door seal is not detached.
  • the pressure-course corridors 205, 207 and 303, 305 can be adjusted by further parameters.
  • FIG. 12 shows an exemplary arrangement of the differential pressure sensor 106 in the body 101.
  • the pressure chamber 110 is connected to the inner space 105 by way of a pressure connection 401 and a pressure line 403, which may have line sections of different diameters.
  • the pressure throttle chamber 111 is executed closed and thereby forms a separate reference system.
  • the pressure throttle chamber 111 includes side walls 405, which can be realized for example by a circumferential seal.
  • the side walls 405 are covered by a closure 407 which hermetically seals the interior of the pressure restricting chamber 111.
  • a constant reference pressure prevails in the interior of the pressure throttle chamber 111, so that any pressure changes only affect the first membrane side 109-1.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
  • Power-Operated Mechanisms For Wings (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Description

Die vorliegende Erfindung betrifft ein Haushaltsgerät mit einer Türöffnungshilfe.The present invention relates to a household appliance with a door opening aid.

Die Offenlegungsschrift WO 2014/198634 A1 beschreibt ein Kältegerät mit einer Türöffnungshilfe.The publication WO 2014/198634 A1 describes a refrigerator with a door opening help.

Die Offenlegungsschrift DE 10 2006 061 083 A1 beschreibt ein Kältegerät mit einer Türöffnungshilfe.The publication DE 10 2006 061 083 A1 describes a refrigerator with a door opening help.

Elektronische Türöffnungshilfen werden oft in modernen Haushaltsgeräten, wie Haushaltskältegeräten, eingesetzt, um einen durch einen Benutzer initiierten Türöffnungsvorgang aktiv zu unterstützen. Hierzu ist es jedoch notwendig, einen Türöffnungswunsch des Benutzers zu erkennen.Electronic door opening aids are often used in modern home appliances, such as domestic refrigerators, to actively assist a user-initiated door opening operation. For this purpose, however, it is necessary to detect a door opening request of the user.

Zur Erkennung eines bevorstehenden Türöffnungsvorgangs kann beispielsweise ein Differenzdrucksensor verwendet werden, welcher bei einer Push-Öffnungsbetätigung einen Druck auf die Tür und bei einer Pull-Öffnungsbetätigung einen Zug an der Tür erkennt. Ein beispielhafter Differenzdrucksensor ist in der Druckschrift EP 1790252 B1 beschrieben.To detect an impending door opening operation, for example, a differential pressure sensor can be used, which detects a push on the door in a push opening operation and a pull on the door in a pull opening operation. An exemplary differential pressure sensor is in the document EP 1790252 B1 described.

Es ist Aufgabe der vorliegenden Erfindung, ein Haushaltsgerät mit einer verbesserten Türöffnungshilfe zu schaffen.It is an object of the present invention to provide a household appliance with an improved door opening aid.

Diese Aufgabe wird durch die Merkmale der unabhängigen Patentansprüche gelöst. Vorteilhafte Weiterbildungsformen sind Gegenstand der abhängigen Patentansprüche, der Beschreibung sowie der Figuren.This object is solved by the features of the independent claims. Advantageous forms of further development are the subject of the dependent claims, the description and the figures.

Die vorliegende Erfindung basiert auf der Erkenntnis, dass die obige Aufgabe durch eine Überwachung einer Mehrzahl von Druckwerten, welche durch einen Differenzdrucksensor ausgegeben werden, gelöst werden kann. Auf diese Weise kann der Druckverlauf statt eines einzelnen Druckwertes zur Erkennung des Türöffnungswunsches herangezogen werden. Verläuft der mittels des Differenzdrucksensors erfasste Druck innerhalb vorgegebener Grenzen, welche einen Druckverlaufskorridor definieren, so kann von einem Türöffnungswunsch ausgegangen werden, und die Türöffnungshilfe wird aktiviert. Verlässt der mittels des Differenzdrucksensors erfasste Druckverlauf jedoch den vorgegebenen Druckverlaufskorridor, so kann beispielsweise von einer versehentlichen Betätigung der Tür des Haushaltsgerätes ausgegangen werden, so dass die Türöffnungshilfe nicht aktiviert wird.The present invention is based on the finding that the above object can be achieved by monitoring a plurality of pressure values output by a differential pressure sensor. In this way, the pressure curve instead of a single pressure value can be used to detect the door opening request. Does the detected by means of the differential pressure sensor within predetermined limits defining a pressure gradient corridor, it can be assumed that a door opening request, and the door opening help is activated. However, if the pressure profile detected by means of the differential pressure sensor leaves the predefined pressure-course corridor, it can be assumed, for example, that the door of the domestic appliance has been inadvertently actuated, so that the door-opening aid is not activated.

Der vorliegende Erfindung liegt die weitere Erkenntnis zugrunde, dass eine Türschließung im Außenbereich des Haushaltsgerätes Druckschwankungen verursachen kann, welche zu einer Fehlauslösung einer Türöffnungshilfe bei der Verwendung eines Differenzdrucksensors führen können. Bei einer Drosselung des dem Differenzdrucksensor zugeführten Außendrucks können derartige Schwankungen gedrosselt bzw. gedämpft werden. Dadurch wird die Wahrscheinlichkeit einer Fehlauslösung einer Türöffnungshilfe aufgrund von außenseitigen Druckschwankungen reduziert.The present invention is based on the further finding that a door closure in the outer region of the household appliance can cause pressure fluctuations, which can lead to a false triggering of a door opening aid when using a differential pressure sensor. In a throttling of the differential pressure sensor supplied external pressure such fluctuations can be throttled or damped. This reduces the likelihood of false triggering of a door opening aid due to outside pressure fluctuations.

Gemäß einem ersten Aspekt betrifft die Erfindung ein Haushaltsgerät mit einem Korpus, einer Tür zum Verschließen eines Innenraums, einem Differenzdrucksensor mit einer Sensormembran zum Erkennen einer Druckdifferenz zwischen einem Luftinnendruck in dem Innenraum und einem Luftaußendruck in einem Außenraum, einer Türöffnungshilfe zum Unterstützen des Türöffnungsvorgangs sowie einer Steuerung der Türöffnungshilfe in Abhängigkeit von der erfassten Druckdifferenz, wobei die Steuerung ausgebildet ist, einen Druckverlauf der Druckdifferenz zu erfassen und die Türöffnungshilfe in Abhängigkeit von dem erfassten Druckverlauf zu steuern.According to a first aspect, the invention relates to a household appliance having a body, a door for closing an interior, a differential pressure sensor with a sensor membrane for detecting a pressure difference between an internal air pressure in the interior and an external air pressure in an outdoor space, a door opening aid for assisting the door opening operation, and a Controlling the door opening aid as a function of the detected pressure difference, wherein the controller is designed to detect a pressure profile of the pressure difference and to control the door opening aid in dependence on the detected pressure profile.

Der Druckverlauf wird durch die Druckausgangswerte des Differenzdrucksensors, beispielsweise innerhalb eines vorbestimmten Zeitintervalls von 100 ms, 500 ms oder 1 s bestimmt. Die Entscheidung über die Aktivierung der Türöffnungshilfe wird daher nicht auf der Basis eines einzelnen Druckwertes, sondern vielmehr auf der Basis eines Druckverlaufs, d.h. auf der Basis einer Druckverlaufsform, bestimmt. Die Steuerung umfasst dabei die Aktivierung der Türöffnungshilfe, die Deaktivierung der Türöffnungshilfe, die Nicht-Aktivierung der Türöffnungshilfe sowie die Verstärkung der Wirkung der Türöffnungshilfe.The pressure profile is determined by the pressure output values of the differential pressure sensor, for example within a predetermined time interval of 100 ms, 500 ms or 1 s. The decision to activate the door opening aid will therefore not be based on a single pressure value, but rather on the basis of a pressure curve, i. based on a pressure waveform. The control comprises the activation of the door opening aid, the deactivation of the door opening aid, the non-activation of the door opening aid and the enhancement of the effect of the door opening aid.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, die Türöffnungshilfe zu aktivieren, falls der erfasste Druckverlauf innerhalb eines vorbestimmten Druckverlaufskorridors verläuft. Der Druckverlaufskorridor kann beispielsweise durch eine untere Druckverlaufsgrenze und durch eine obere Druckverlaufsgrenze, welche vorgegeben sind, bestimmt werden. Verläuft der Druckverlauf innerhalb dieser Grenzen und somit innerhalb des dadurch vorbestimmten Druckverlaufskorridors, so kann davon ausgegangen werden, dass ein Türöffnungswunsch vorliegt und die Türöffnungshilfe aktiviert werden kann.According to one embodiment, the controller is configured to activate the door opening aid if the detected pressure profile extends within a predetermined pressure course corridor. The pressure-course corridor can be determined, for example, by a lower pressure curve boundary and by an upper pressure curve boundary, which are predetermined. Runs the pressure curve within these limits and thus within the thus predetermined pressure course corridor, so it can be assumed that there is a door opening request and the door opening help can be activated.

Der Druckverlaufskorridor kann bei unterschiedlichen Türöffnungsvarianten unterschiedlich sein. Im Falle eines durch Druck auf die Tür ausgelösten Öffnungsvorgangs (Push) ist bei einem Andrücken der Tür durch einen Benutzer von einem steigenden Druck auszugehen. Nach dem Loslassen der Tür durch den Benutzer fällt der Druck hingegen ab. In diesem Fall kann der Druckverlauf beispielsweise linear ansteigend sein bis zu einem Druckdachwert, welcher einen Druckmaximalwert repräsentiert. Nach Erreichen des Druckmaximalwertes, d.h. unmittelbar nach dem Loslassen der Tür, fällt der Druck beispielsweise linear ab. Wird ein derartiger Druckverlauf erfasst, so wird die Türöffnungshilfe aktiviert.The pressure gradient corridor may be different for different door opening variants. In the case of an opening operation (push) triggered by pressure on the door, an increase in pressure is to be assumed when the door is pressed by a user. After releasing the door by the user, however, the pressure drops. In this case, the pressure curve may, for example, be linearly increasing up to a pressure peak value, which represents a maximum pressure value. Upon reaching the maximum pressure value, i. immediately after releasing the door, for example, the pressure drops linearly. If such a pressure profile is detected, the door opening aid is activated.

Wird hingegen die Tür durch einen Zug an der Tür geöffnet, so reduziert sich der mittels des Differenzdrucksensors erfasste Druck beispielsweise linear während der Zugphase, was in einer negativen Drucksteigung resultiert. Wird ein derart negativer Druckverlauf innerhalb des Druckverlaufskorridors erfasst, so kann im Falle der Zug-Öffnungsvariante ebenfalls davon ausgegangen werden, dass ein Türöffnungswunsch vorliegt, so dass die Türöffnungshilfe aktiviert werden kann.If, however, the door is opened by a pull on the door, then the pressure detected by means of the differential pressure sensor, for example, reduces linearly during the pulling phase, which results in a negative pressure gradient. If such a negative pressure curve is detected within the pressure curve corridor, it can also be assumed in the case of the train opening variant that a door opening request is present, so that the door opening aid can be activated.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, eine Steigung des erfassten Druckverlaufs mit zumindest einem Steigungsschwellwert zu vergleichen, um zu erkennen, ob der erfasste Druckverlauf innerhalb eines vorbestimmten Druckverlaufskorridors liegt, und die Türöffnungshilfe nur dann zu aktivieren, wenn der erfasste Druckverlauf innerhalb des vorbestimmten Druckverlaufskorridors liegt. Der Steigungsschwellwert kann beispielsweise durch eine untere Druckverlaufsgrenze und/oder durch eine obere Druckverlaufsgrenze bestimmt werden. Im Falle einer Push-Öffnungsvariante ist die Steigung des Steigungsschwellwertes in der ersten Druckverlaufsphase positiv und fällt dann mit einer negativen Steigung ab. Im Falle der Pull-Öffnungsvariante hat der Steigungsschwellwert von Beginn an eine negative Steigung. Dadurch werden in vorteilhafter Weise unterschiedliche Öffnungsszenarien mit einhergehenden, unterschiedlichen Druckverläufen berücksichtigt.In one embodiment, the controller is configured to compare a slope of the sensed pressure profile to at least one gradient threshold to determine if the sensed pressure profile is within a predetermined pressure course corridor, and to activate the door opening assist only if the sensed pressure profile is within the predetermined pressure waveform corridor lies. The gradient threshold value can be determined, for example, by a lower pressure profile boundary and / or by an upper pressure profile boundary. In the case of a push opening variant, the slope of the gradient threshold value in the first pressure progression phase is positive and then drops off with a negative gradient. In the case of the pull opening variant, the slope threshold has a negative slope from the beginning. As a result, different opening scenarios with associated, different pressure curves are taken into account in an advantageous manner.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, eine Steigungsumkehr des erfassten Druckverlaufs zu erfassen und die Türöffnungshilfe bei Vorliegen der Steigungsumkehr zu aktivieren. Die Steigungsumkehr ist, wie vorstehend ausgeführt, bei einer Push-Variante zu erwarten und tritt unmittelbar nach dem Loslassen der Tür auf. Die Steigungsumkehr ist durch einen Druckmaximalwert bestimmt, welcher ebenfalls detektiert werden kann. Dadurch wird auf eine besonders einfache und sichere Weise der Türöffnungswunsch bei einer Push-Öffnung erkannt.According to one embodiment, the controller is designed to detect a change in the gradient of the detected pressure profile and to activate the door opening aid in the presence of the gradient reversal. The reversal is expected, as stated above, in a push variant and occurs immediately after releasing the door. The slope reversal is determined by a maximum pressure value which can also be detected. As a result, the door opening request is detected at a push opening in a particularly simple and secure manner.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, eine positive Steigung des erfassten Druckverlaufs bis zur Steigungsumkehr sowie eine negative Steigung des erfassten Druckverlaufs nach der Steigungsumkehr zu erfassen und die Türöffnungshilfe nur dann zu aktivieren, falls die positive Steigung des Druckverlaufs und die negative Steigung des Druckverlaufs innerhalb eines vorbestimmten Druckverlaufskorridors liegen. Auf diese Weise werden nicht einzelne Druckwerte, sondern vielmehr der Verlauf des Druckanstiegs und des Druckabstiegs ausgewertet, um die Türöffnungshilfe zu aktivieren. Somit wird der gesamte Druckinitiierungsvorgang, welcher beispielsweise gemäß der Push-Variante durch ein Andrücken der Tür initiiert wird, überwacht und ausgewertet. Dadurch werden in vorteilhafter Weise Fehlauslösungen der Türöffnungshilfe vermieden.According to one embodiment, the controller is configured to detect a positive slope of the detected pressure profile up to the slope reversal and a negative slope of the detected pressure curve after the slope reversal and to activate the door opening aid only if the positive slope of the pressure curve and the negative slope of the pressure curve within lie of a predetermined pressure course corridor. In this way, not individual pressure values, but rather the course of the pressure rise and the pressure decrease are evaluated in order to activate the door opening aid. Thus, the entire pressure initiation process, which is initiated, for example, according to the push variant by pressing the door, monitored and evaluated. As a result, false opening the door opening help are avoided in an advantageous manner.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, die Türöffnungshilfe bei einer Erhöhung einer Steigung des erfassten Druckverlaufs zu aktivieren oder deren Wirkung zu verstärken. In diesem Falle wird die Pull-Variante in besonders vorteilhafter Weise berücksichtigt, bei der der Druckunterschied und somit die Steigung des erfassten Druckverlaufs negativ sind. Die Türöffnungshilfe bei der Pull-Variante kann dann aktiviert werden, wenn ein Absolutwert des erfassten, negativen Druckunterschiedes überschritten wird.According to one embodiment, the controller is configured to activate the door opening aid with an increase in a slope of the detected pressure curve or to increase its effect. In this case, the pull variant is considered in a particularly advantageous manner, in which the pressure difference and thus the slope of the detected pressure curve are negative. The door opening aid in the pull variant can be activated if an absolute value of the detected, negative pressure difference is exceeded.

Gemäß einer Ausführungsform ist die Steuerung ausgebildet, die Türöffnungshilfe zu aktivieren, falls der Druckverlauf mit negativen Druckdifferenzwerten den Druckverlaufskorridor unterschreitet. Auf diese Weise wird in vorteilhafter Weise der Türöffnungswunsch bei der Pull-Öffnungsvariante erfasst, bei der Druckunterschiedswerte aufgrund des auf die Tür ausgeübten Drucks von Anfang an negativ sind, so dass der Druckverlauf von Anfang an eine negative Steigung hat.According to one embodiment, the controller is configured to activate the door opening aid if the pressure profile with negative pressure difference values falls below the pressure course corridor. In this way, the door opening request is advantageously detected in the pull opening variant, in which the pressure difference values due to the pressure exerted on the door from the beginning are negative, so that the pressure curve has a negative slope from the beginning.

Gemäß einer Ausführungsform weist die Sensormembran eine dem Innenraum zugewandte erste Membranseite und eine dem Innenraum abgewandte zweite Membranseite auf, und die zweite Membranseite ist von einer Druckdrosselkammer umgeben, und die Druckdrosselkammer ist ausgebildet, den Luftaußendruck zumindest teilweise zu drosseln.According to one embodiment, the sensor membrane has a first membrane side facing the interior and a second membrane side facing away from the interior, and the second membrane side is surrounded by a pressure throttle chamber, and the pressure throttle chamber is designed to at least partially throttle the outside air pressure.

Durch die Verwendung der Druckdrosselkammer werden Schwankungen des Luftaußendrucks, welche beispielsweise bei einer Türschließung entstehen können, reduziert, wodurch fehlerhafte Auslösungen der Türöffnungshilfe vermieden werden können. Gleichzeitig wird der Druckerfassungssensor in einem geringeren Druckbereich betrieben, wodurch eine genauere Auflösung der Druckunterschiede erreicht werden kann.By using the pressure throttle chamber fluctuations in the external air pressure, which can occur, for example, in a door lock, reduced, whereby incorrect triggering of the door opening help can be avoided. At the same time the pressure sensing sensor is operated in a lower pressure range, whereby a more accurate resolution of the pressure differences can be achieved.

Gemäß einer Ausführungsform ist der Differenzdrucksensor in einem Korpus angeordnet. Durch die Verwendung der Druckdrosselkammer kann der Differenzdrucksensor zudem in einem beliebigen Bereich des Korpus angeordnet werden.According to one embodiment, the differential pressure sensor is arranged in a body. By using the pressure throttle chamber, the differential pressure sensor can also be arranged in any area of the body.

Gemäß einer Ausführungsform schließt die Druckdrosselkammer die zweite Membranseite zumindest teilweise oder vollständig ein. Bei einer zumindest teilweisen Umschließung der zweiten Membranseite durch die Druckdrosselkammer wird die Möglichkeit eines langsamen Druckausgleichs zwischen dem Inneren der Druckdrosselkammer und der Umgebung der Druckdrosselkammer bewirkt. Somit kann der die zweite Membranseite beaufschlagende Luftdruck an atmosphärische Luftdruckschwankungen angepasst werden. Ist die zweite Membranseite hingegen vollständig eingeschlossen, so wird durch die Druckdrosselkammer ein Referenzsystem mit einem stets konstanten Druck bereitgestellt.According to one embodiment, the pressure throttle chamber encloses the second membrane side at least partially or completely. In an at least partial enclosure of the second membrane side by the pressure throttle chamber, the possibility of a slow pressure equalization between the interior of the pressure throttle chamber and the environment of the pressure throttle chamber is effected. Thus, the pressure acting on the second membrane side air pressure can be adapted to atmospheric air pressure fluctuations. On the other hand, if the second membrane side is completely enclosed, then a reference system with an always constant pressure is provided by the pressure restrictor chamber.

Gemäß einer Ausführungsform ist die Druckdrosselkammer ausgebildet, einen Referenzdruck bereitzustellen oder den Luftaußendruck zu drosseln.According to one embodiment, the pressure throttle chamber is designed to provide a reference pressure or to throttle the external air pressure.

Gemäß einer Ausführungsform weist die Druckdrosselkammer ein Druckdrosselelement, insbesondere eine Drosselöffnung oder eine Drosselstufe auf, welche für einen monotonen Druckausgleich zwischen einem Inneren der Druckdrosselkammer und dem Außenraum vorgesehen ist. Durch den monotonen Druckausgleich wird einerseits erreicht, dass eine Anpassung des Luftdrucks im Inneren der Druckdrosselkammer an atmosphärische Schwankungen des Luftdrucks außerhalb der Druckdrosselkammer angepasst werden kann. Gleichzeitig werden nicht-monotone, also abrupte Steigungen des Drucks nicht an die zweite Membranseite weitergegeben.According to one embodiment, the pressure throttle chamber on a pressure throttle element, in particular a throttle opening or a throttle stage, which is provided for a monotone pressure equalization between an interior of the pressure throttle chamber and the outer space. Due to the monotonous pressure equalization on the one hand achieved that an adjustment of the air pressure in the interior of the pressure throttle chamber can be adapted to atmospheric fluctuations of the air pressure outside the pressure throttle chamber. At the same time non-monotonous, ie abrupt slopes of the pressure are not passed on to the second membrane side.

Gemäß einer Ausführungsform weist die Steuerung eine Steuerungsplatine mit einem elektrischen Schaltkreis auf, und die Steuerungsplatine bildet eine Wandung der Druckdrosselkammer oder schließt die Druckdrosselkammer ab. Die Platine kann beispielsweise einen Deckel der Druckdrosselkammer bilden, wobei durch die Ausführung der Platine stets davon auszugehen ist, dass beispielsweise aufgrund der Via-Kontaktierungen in der Platine Öffnungen vorhanden sind, welche als Drosselöffnungen ausgenutzt werden können, wodurch eine zumindest teilweise Druckdrosselung erreicht werden kann. Gleichzeitig wird insgesamt weniger Bauraum benötigt, weil die Platine nicht an einem gesonderten Ort untergebracht werden kann. Darüber hinaus können die Verbindungsleitungen zu der Platine kürzer ausgeführt werden, was eine Materialersparnis nach sich zieht. Die Seitenwandungen der Drosselkammer, auf der die als Deckel dienende Platine aufliegen kann, können beispielsweise durch Luftdichtungen oder durch sonstige Wandungen gebildet werden. Ein weiterer Vorteil dieser Ausführungsform besteht darin, dass geringere Öffnungen tolerierbar sind, weil diese als Drosselöffnungen fungieren. Dadurch wird auch der Herstellungsaufwand reduziert.According to one embodiment, the controller has a control board with an electrical circuit, and the control board forms a wall of the pressure throttle chamber or closes off the pressure throttle chamber. The board can for example form a lid of the pressure throttle chamber, which is always to be assumed by the design of the board that, for example due to the via contacts in the board openings are present, which can be exploited as throttle openings, whereby at least partial pressure throttling can be achieved , At the same time less space is needed because the board can not be accommodated in a separate location. In addition, the connection lines to the board can be made shorter, resulting in a saving of material. The side walls of the throttle chamber, on which the serving as a lid board can rest, can be formed for example by air seals or other walls. Another advantage of this embodiment is that smaller openings are tolerable, because they act as throttle openings. As a result, the production cost is reduced.

Gemäß einer Ausführungsform ist die Tür durch einen mechanischen Druck auf die Tür offenbar, und die Steuerung ist ausgebildet, die Türöffnungshilfe bei einem Anstieg der erfassten Druckdifferenz zu aktivieren, oder die Tür ist durch einen mechanischen Zug an Tür offenbar, und die Steuerung ist ausgebildet, die Türsteuerung bei einer Verringerung der erfassten Druckdifferenz zu aktivieren. Somit können sowohl die Push-Variante als auch die Pull-Variante realisiert werden.According to one embodiment, the door is manifested by a mechanical pressure on the door, and the controller is adapted to activate the door opening aid upon an increase in the detected pressure difference, or the door is revealed by a mechanical pull on the door, and the control is designed to activate the door control with a reduction in the detected pressure difference. Thus, both the push variant and the pull variant can be realized.

Gemäß einem weiteren Aspekt betrifft die Erfindung ein Verfahren zum Steuern einer aktivierbaren Türöffnungshilfe zum Unterstützen eines Öffnens einer Gerätetür in einem Haushaltsgerät, das einen Korpus, eine Tür zum Verschließen eines Innenraums, einen Differenzdrucksensor mit einer Sensormembran zum Erfassen einer Druckdifferenz zwischen einem Luftinnendruck in dem Innenraums und einem Luftaußendruck außerhalb des Außenraums aufweist, wobei ein Druckverlauf der Druckdifferenz innerhalb eines Zeitintervalls erfasst wird und wobei die Türöffnungshilfe in Abhängigkeit von dem erfassten Druckverlauf aktiviert wird.According to another aspect, the invention relates to a method of controlling an activatable door opening aid for assisting opening of a door in a household appliance comprising a body, a door for closing an interior space, a differential pressure sensor with a sensor membrane for detecting a pressure difference between an internal air pressure in the interior space and an external air pressure outside the outer space, wherein a pressure curve of the pressure difference within a Time interval is detected and wherein the door opening aid is activated in dependence on the detected pressure profile.

Gemäß einer Ausführungsform wird die Steuerung die Türöffnungshilfe nur dann aktiviert, falls der erfasste Druckverlauf innerhalb eines vorbestimmten Druckverlaufskorridors verläuft.According to one embodiment, the controller activates the door opening aid only if the detected pressure profile extends within a predetermined pressure course corridor.

Weitere Merkmale des erfindungsgemäßen Verfahrens ergeben sich unmittelbar aus der Funktionalität des erfindungsgemäßen Haushaltsgerätes.Further features of the method according to the invention emerge directly from the functionality of the household appliance according to the invention.

Weitere Ausführungsbeispiele werden Bezug nehmend auf die beiliegenden Zeichnungen erläutert. Es zeigen:

Fig. 1
eine schematische Ansicht eines Haushaltskältegerätes mit einer Türöffnungshilfe;
Fig. 2
einen beispielhaften Druckverlauf;
Fig. 3
einen beispielhaften Druckverlauf; und
Fig. 4
einen Differenzdrucksensor.
Further embodiments will be explained with reference to the accompanying drawings. Show it:
Fig. 1
a schematic view of a household refrigerator with a door opening help;
Fig. 2
an exemplary pressure curve;
Fig. 3
an exemplary pressure curve; and
Fig. 4
a differential pressure sensor.

Fig. 1 zeigt schematisch ein Haushaltsgerät 100, das beispielsweise ein Haushaltskältegerät sein kann. Das Haushaltsgerät 100 hat einen Korpus 101 sowie eine Tür 103, welche den Innenraum 105 des Korpus 101 verschließt. Ferner ist eine elektrische Türöffnungshilfe 107 vorgesehen, um einen Türöffnungsvorgang zu unterstützen. Hierzu kann die Türöffnungshilfe 107 einen Aktuator aufweisen, welcher die durch einen Benutzer initiierte Türöffnung unterstützt. Fig. 1 schematically shows a household appliance 100, which may be, for example, a household refrigerator. The household appliance 100 has a body 101 and a door 103 which closes the interior 105 of the body 101. Further, an electric door opening aid 107 is provided to assist a door opening operation. For this purpose, the door opening aid 107 may have an actuator which assists the door opening initiated by a user.

Zur Erkennung eines Türöffnungswunsches ist ein Differenzdrucksensor 106 vorgesehen. Der Differenzdrucksensor 106 weist eine Sensormembran 109 auf, welche eine erste Membranseite 109-1 und eine zweite Membranseite 109-2 aufweist.To detect a door opening request, a differential pressure sensor 106 is provided. The differential pressure sensor 106 has a sensor membrane 109, which has a first membrane side 109-1 and a second membrane side 109-2.

Die erste Membranseite 109-1 ist dem Innenraum 105 zugewandt und dem Luftinnendruck im Innenraum 105 ausgesetzt. Hierzu kann die erste Membranseite 109-1 in einer Druckkammer 110 angeordnet sein, welche in Fig. 1 schematisch dargestellt und dem Innendruck im Innenraum 105 unmittelbar ausgesetzt ist.The first diaphragm side 109-1 faces the inner space 105 and is exposed to the internal air pressure in the inner space 105. For this purpose, the first membrane side 109-1 can be arranged in a pressure chamber 110, which in Fig. 1 shown schematically and the internal pressure in the interior 105 is directly exposed.

Die zweite Membranseite 109-2 ist hingegen in einer Drosselkammer 111 angeordnet, welche vorgesehen ist, einen Luftaußendruck zumindest teilweise zu drosseln. Dadurch wird die zweite Membranseite 109-2 einem gedrosselten Luftaußendruck ausgesetzt, so dass sich abrupte Druckschwankungen, welche beispielsweise bei einem Schließen der Tür 103 auftreten, nicht unmittelbar auf die Druckmessung auswirken.The second membrane side 109-2, however, is arranged in a throttle chamber 111, which is provided to at least partially throttle an external air pressure. As a result, the second membrane side 109-2 is exposed to a throttled external air pressure, so that abrupt pressure fluctuations, which occur, for example, when the door 103 closes, do not directly affect the pressure measurement.

Die Drosselkammer 111 kann vollständig geschlossen sein, wodurch ein Referenzdruck im Inneren der Drosselkammer bereitgestellt wird. Die Drosselkammer 111 muss jedoch nicht vollständig verschlossen sein, sondern sie kann beispielsweise eine oder mehrere Druckausgleichsöffnungen aufweisen, um einen langsamen Druckausgleich bei beispielsweise atmosphärischen Schwankungen des Luftaußendrucks zu ermöglichen. In beiden Fällen reduziert die Drosselung eine direkte Umgebungsauswirkung auf die Sensormembran 109, wodurch Druckfehlerfassungen vermieden werden können.The throttle chamber 111 may be fully closed, thereby providing a reference pressure inside the throttle chamber. However, the throttle chamber 111 does not have to be completely closed, but it may, for example, have one or more pressure compensation openings to allow a slow pressure equalization in, for example, atmospheric fluctuations in the external air pressure. In both cases, throttling reduces a direct environmental impact on the sensor membrane 109, thereby avoiding pressure error detections.

Ist die Druckdrosselkammer 111 nicht hermetisch abgeschlossen, so kann sich der auf diese Weise gedrosselte Differenzdrucksensor 106 dem Umgebungsdruck anpassen. Auf diese Weise wird eine hohe Auflösung erreicht, welche beispielsweise in einem Auflösungsbereich von 0,001 mbar liegen kann. Durch die Drosselung kann der Arbeitsbereich des Differenzdrucksensors 106 auf einen kleinen Druckbereich beschränkt werden, was die erhöhte Auflösung ermöglicht. Mit dem gedrosselten Druckausgleich arbeitet der Differenzdrucksensor 106 somit stets im oder um den Nullpunkt im Auflösungsbereich und driftet bei höheren Umgebungsdrücken nicht aus dem Messbereich heraus.If the pressure throttle chamber 111 is not hermetically sealed, the throttled differential pressure sensor 106 can adjust to the ambient pressure. In this way, a high resolution is achieved, which may for example be in a resolution range of 0.001 mbar. By throttling, the operating range of the differential pressure sensor 106 can be limited to a small pressure range, allowing the increased resolution. With the throttled pressure compensation, the differential pressure sensor 106 thus always operates in or around the zero point in the resolution range and does not drift out of the measuring range at higher ambient pressures.

Das Haushaltsgerät 100 umfasst ferner eine Steuerung 113, welche den Türaktuator 107 steuert, beispielsweise aktiviert. Gemäß einer Ausführungsform ist die Steuerung 111 auf einer Platine angeordnet, welche als Deckel die Druckdrosselkammer 111 abschließt. Dadurch wird eine Luftdruckdrosselung erreicht, wobei gleichzeitig aufgrund der in einer Platine stets vorhandenen Öffnungen bzw. etwaigen Passungenauigkeiten, welche sich im vorliegenden Fall vorteilhaft auswirken, ein langsamer Druckausgleich realisiert werden kann.The household appliance 100 further comprises a controller 113, which controls the door actuator 107, for example, activated. According to one embodiment, the controller 111 is arranged on a circuit board, which closes off the pressure throttle chamber 111 as a cover. As a result, an air pressure throttling is achieved, at the same time due to the always present in a circuit board openings or any fit inaccuracies which advantageous effect in the present case, a slow pressure equalization can be realized.

Die in Fig. 1 beschriebene Druckdrosselkammer 111 ist zwar vorteilhaft, jedoch für die nachfolgend beschriebene Signalauswertung nicht notwendig. Vielmehr können die anhand der in den Fig. 2 und 3 dargestellten Ausführungsbeispiele beschriebenen Signalauswertungen bei beliebigen Differenzdrucksensoren eingesetzt werden.In the Fig. 1 Although described pressure throttle chamber 111 is advantageous, but not necessary for the signal analysis described below. Rather, the basis of the in the Fig. 2 and 3 illustrated embodiments described signal evaluations are used in any differential pressure sensors.

Fig. 2 zeigt einen beispielhaften Druckverlauf 201, welcher einen ersten Druckverlaufsabschnitt 201-1 mit einer positiven Steigung und einen zweiten Druckverlaufsabschnitt 201-2 mit einer negativen Steigung aufweist. Der Druckverlauf 201 hat ferner einen Steigungsumkehrpunkt 203, welcher durch einen erfassten Druckmaximalwert bestimmt ist. Fig. 2 shows an exemplary pressure curve 201, which has a first pressure gradient section 201-1 with a positive slope and a second pressure gradient section 201-2 with a negative slope. The pressure curve 201 further has a gradient reversal point 203, which is determined by a detected pressure maximum value.

Der Druckverlauf 201 ist ein Differenzdrucksignal, welches beispielsweise bei der Push-Variante bei einem Öffnungswunsch resultiert, bei welchem ein Benutzer die Tür andrückt, um einen Öffnungsvorgang zu initiieren. Der erste Druckverlaufsabschnitt 201-1 entsteht in der Phase des Andrückens bis zum Erreichen des Maximaldruckes 203. Der zweite Druckverlaufsabschnitt 201-2 entsteht beim Loslassen der Tür 103 und der damit einhergehenden Reduktion des Differenzdrucks.The pressure profile 201 is a differential pressure signal, which results, for example, in the push variant at an opening request, in which a user presses the door to initiate an opening process. The first pressure profile section 201-1 is formed in the phase of pressing until the maximum pressure 203 is reached. The second pressure profile section 201-2 results when the door 103 is released and the associated reduction in the differential pressure.

Die Steuerung 113 ist bevorzugt ausgebildet, den Druckverlauf 201 zu erfassen und in Abhängigkeit des erfassten Druckverlaufs die Türöffnungshilfe 107 zu steuern, beispielsweise zu aktivieren.The controller 113 is preferably designed to detect the pressure curve 201 and, depending on the detected pressure curve, to control the door opening aid 107, for example to activate it.

Gemäß einer Ausführungsform kann die Steuerung 113 ausgebildet sein, eine kontinuierliche Mittelwertbildung des von dem Differenzdrucksensor 106 bereitgestellten Differenzdrucks zu bilden, wodurch eine Signalsteigung überwacht werden kann. Bei einer positiven Signalsteigung, d.h. bei einem Druckanstieg, resultiert der beispielhafte Druckverlaufsabschnitt 201-1, während bei einer negativen Signalsteigung, d.h. bei einem Abfall des Differenzdrucks, der zweite Druckverlaufsabschnitt 201-2 entsteht. Gemäß einer Ausführungsform kann das durch den Differenzdrucksensor 106 bereitgestellte Sensorsignal, welches eine Mehrzahl von Druckwerten angibt und somit den Druckverlauf 201 anzeigt, digitalisiert werden. Sofern eine Steigung des Druckverlaufs 201 aufgrund eines Druckaufbaus auf die Gerätetür 103 erkannt wird, so kann eine Analyse durchgeführt werden, ob der Druckverlauf, also beispielsweise die Steigung, innerhalb vorgegebener Grenzen 205 und 207 verläuft. Dabei ist die Grenze 205 eine untere Druckverlaufsgrenze, während die Grenze 207 eine obere Druckverlaufsgrenze ist. Die Grenzen 205 und 207 definieren einen Druckverlaufskorridor, in welchem der Druckverlauf 201 verlaufen soll, damit die Türöffnungshilfe 107 aktiviert wird.According to one embodiment, the controller 113 may be configured to form a continuous averaging of the differential pressure provided by the differential pressure sensor 106, whereby a signal slope may be monitored. In the case of a positive signal gradient, ie with a pressure rise, the exemplary pressure profile section 201-1 results, while with a negative signal gradient, ie with a drop in the differential pressure, the second pressure profile section 201-2 results. According to one embodiment, the sensor signal provided by the differential pressure sensor 106, which indicates a plurality of pressure values and thus indicates the pressure profile 201, can be digitized. If a slope of the pressure curve 201 due a pressure build-up on the appliance door 103 is detected, an analysis can be carried out as to whether the pressure profile, that is to say for example the gradient, runs within predetermined limits 205 and 207. In this case, the boundary 205 is a lower pressure gradient boundary, while the boundary 207 is an upper pressure gradient boundary. The boundaries 205 and 207 define a pressure-course corridor in which the pressure curve 201 is intended to run so that the door-opening aid 107 is activated.

Zur Aktivierung der Türöffnungshilfe 107 kann gemäß einer Ausführungsform zusätzlich der maximale Druckwert 203, d.h. ein Differenzdruckdachwert, erreicht werden, wonach anschließend die negative Steigung des Druckverlaufs 201 innerhalb der Grenzen 205, 207 verläuft. Gemäß einer Ausführungsform bilden die Grenzen 205, 207, d.h. der Druckverlaufskorridor, eine Einhüllende. Befindet sich der Druckverlauf 201 innerhalb der Einhüllenden, so kann die Türöffnungshilfe 107 aktiviert werden, wodurch ein Aktor gestartet wird. Der Aktor kann gemäß einer Ausführungsform zeitlich versetzt gestartet werden, wodurch einem Bewegungsablauf eines Benutzers Rechnung getragen wird. Der Druckverlaufskorridor 205, 207 kann gemäß einer Ausführungsform weitere Steigungen, beispielsweise Drucksignalüberschwinger der Tür oder Drucksignalsteigerungsänderungen berücksichtigen, um Fehlauslösungen der Türöffnungshilfe 107 noch weiter zu minimieren.To activate the door opening aid 107, according to one embodiment, the maximum pressure value 203, i. a differential pressure peak, are reached, after which the negative slope of the pressure curve 201 then extends within the boundaries 205, 207. According to one embodiment, the boundaries 205, 207, i. the pressure-course corridor, an envelope. If the pressure curve 201 is within the envelope, then the door opening aid 107 can be activated, as a result of which an actuator is started. According to one embodiment, the actuator can be started at a staggered time, whereby a movement sequence of a user is taken into account. The pressure-course corridor 205, 207 can, according to one embodiment, take into account further gradients, for example pressure signal overshoots of the door or pressure signal increase changes, in order to further minimize false triggering of the door-opening aid 107.

Gemäß einer Ausführungsform läuft eine Öffnungswunschdetektion innerhalb eines Bereichs von beispielsweise 0,2 s bzw. auch schneller ab. In diesem Fall kann eine überlagerte Druckdifferenz, wie sie beispielsweise bei einem Unterdruckaufbau nach einem Türschließen vorliegt, und die mit einer langsamen Änderung der Druckdifferenz einhergehen kann, berücksichtigt werden. Diese Berücksichtigung kann beispielsweise durch eine Verschiebung des Differenzdruckdachwertes bzw. der Grenzen 205, 207 erfolgen, wodurch eine Anpassung des Druckverlaufskorridors an gegebene Bedingungen erreicht werden kann.According to one embodiment, an opening request detection takes place within a range of, for example, 0.2 s or even faster. In this case, a superimposed pressure difference, as it is, for example, in a negative pressure build-up after a door closing, and which may be accompanied by a slow change in the pressure difference, be taken into account. This consideration can be done, for example, by a shift of the differential pressure differential value or the limits 205, 207, whereby an adaptation of the pressure gradient corridor to given conditions can be achieved.

Aufgrund der Auswertung des Differenzdruckverlaufs 201 kann gemäß einer Ausführungsform auch das Öffnen und das Schließen der Tür 103 erkannt werden.Due to the evaluation of the differential pressure curve 201, according to one embodiment, the opening and closing of the door 103 can also be detected.

Die untere Grenze 205 sowie die obere Grenze 207 weisen jeweils einen Differenzdruckdachwert 208, 210 auf, welcher jeweils einen Steigungsumkehrpunkt 203 anzeigt.The lower limit 205 and the upper limit 207 each have a differential pressure differential 208, 210, which in each case indicates a gradient reversal point 203.

Fig. 3 zeigt eine Differenzdruckverlauf 301, welcher sich in dem Pull-Szenario ergibt, in welchem die Tür 103 durch einen Zug an der Tür 103 geöffnet wird. In diesem Fall ist die Steigung des Differenzdruckes negativ, was in Fig. 3 durch die dargestellten negativen Druckwerte Δp zum Ausdruck gebracht ist. Somit ist die Steigung des Differenzdruckverlaufs 301 negativ. Der Druckverlaufskorridor ist hierbei durch die untere Druckverlaufsgrenze 303 und die obere Druckverlaufsgrenze 305 gegeben, welche jeweils negative Steigungen aufweisen. Bei dem Differenzdruckverlauf 301 innerhalb der Druckverlaufsgrenzen 303, 305, d.h. innerhalb des Druckverlaufskorridors 303, 305, wird die Türöffnungshilfe 107 aktiviert. Wie es in Fig. 3 dargestellt ist, kann eine stärker werdende Steigung des Differenzdruckverlaufs 301-1 die Aktivierung der Türöffnungshilfe 107, also das Einwirken einer zusätzlichen Aktorenunterstützung, anzeigen, solange beispielsweise eine Türdichtung noch nicht abgelöst ist. Fig. 3 shows a differential pressure curve 301, which results in the pull scenario in which the door 103 is opened by a train on the door 103. In this case, the slope of the differential pressure is negative, which is in Fig. 3 is expressed by the illustrated negative pressure values Δp. Thus, the slope of the differential pressure curve 301 is negative. The pressure course corridor is here given by the lower pressure curve boundary 303 and the upper pressure curve boundary 305, which each have negative slopes. In the differential pressure curve 301 within the pressure curve boundaries 303, 305, ie within the pressure curve corridor 303, 305, the door opening aid 107 is activated. As it is in Fig. 3 is shown, a stronger slope of the differential pressure curve 301-1, the activation of the door opening aid 107, so the effect of an additional actuator support, indicate, for example, as long as a door seal is not detached.

Dadurch wird eine schnelle Detektion eines Öffnungswunsches durchgeführt, wobei eine Unterscheidung unterschiedlicher Auslösearten möglich ist. Auf diese Weise werden Fehlauslösungen der Türöffnungshilfe 107 vermieden, welche beispielsweise bei anderweitigen Türberührungen, wie beispielsweise einem Anlehnen an die Tür 103 oder einer Betätigung eines an der Tür 103 angebrachten Bedienfeldes entstehen könnten.As a result, a rapid detection of an opening request is carried out, it being possible to distinguish between different triggering modes. In this way, false triggering of the door opening aid 107 are avoided, which could arise, for example, in other door touches, such as leaning against the door 103 or actuation of an attached to the door 103 control panel.

Gemäß einer Ausführungsform können die Druckverlaufskorridore 205, 207 und 303, 305 durch weitere Parameter justiert werden.According to one embodiment, the pressure-course corridors 205, 207 and 303, 305 can be adjusted by further parameters.

Dadurch kann der Benutzer beispielsweise in einem Bedienfeld der Steuerung 113 bzw. in einem Bedienfeld der Gerätesteuerung anwählen, ab welchem Druckwert die Türöffnungshilfe 107 aktiviert werden soll.This allows the user to select, for example, in a control panel of the controller 113 or in a control panel of the device control, from which pressure value the door opening aid 107 is to be activated.

Fig. 4 zeigt eine beispielhafte Anordnung des Differenzdrucksensors 106 in dem Korpus 101 an. Fig. 4 FIG. 12 shows an exemplary arrangement of the differential pressure sensor 106 in the body 101.

Die Druckkammer 110 ist über einen Druckanschluss 401 und eine Druckleitung 403, welche Leitungsabschnitte verschiedenen Durchmessers aufweisen kann, drucktechnisch mit dem Innenraum 105 verbunden.The pressure chamber 110 is connected to the inner space 105 by way of a pressure connection 401 and a pressure line 403, which may have line sections of different diameters.

In dem in Fig. 4 dargestellten Ausführungsbeispiel ist die Druckdrosselkammer 111 geschlossen ausgeführt und bildet dadurch ein eigenes Referenzsystem aus. Hierzu umfasst die Druckdrosselkammer 111 Seitenwandungen 405, welche beispielsweise durch eine umlaufende Dichtung realisiert werden können. Die Seitenwandungen 405 sind durch einen Abschluss 407 abgedeckt, welche das Innere der Druckdrosselkammer 111 hermetisch abschließt. Somit herrscht im Inneren der Druckdrosselkammer 111 ein konstanter Referenzdruck, so dass etwaige Druckänderungen sich nur über die erste Membranseite 109-1 auswirken.In the in Fig. 4 illustrated embodiment, the pressure throttle chamber 111 is executed closed and thereby forms a separate reference system. For this purpose, the pressure throttle chamber 111 includes side walls 405, which can be realized for example by a circumferential seal. The side walls 405 are covered by a closure 407 which hermetically seals the interior of the pressure restricting chamber 111. Thus, a constant reference pressure prevails in the interior of the pressure throttle chamber 111, so that any pressure changes only affect the first membrane side 109-1.

Wird beispielsweise in dem Push-Szenario ein Öffnungswunsch durch einen Druck auf die Tür 103 ausgeübt, so entsteht eine Türbewegung, welche eine Druckänderung im Innenraum 105 sowie in der Umgebung bewirken kann. Aufgrund der geschlossenen Bauweise des Differenzdrucksensors 106 werden die Druckänderungen über die erste Membranseite 109-1 erfasst. Der Differenzdrucksensor 106 bildet dabei eine Differenz zwischen dem erfassten Druck und dem in der Druckdrosselkammer 111 herrschenden Referenzdruck aus. Auf diese Weise wird der Einfluss der Druckschwankungen in der Umgebung des Haushaltsgerätes 100 reduziert.If, for example, an opening request is exerted by a pressure on the door 103 in the push scenario, a door movement is created which can bring about a pressure change in the interior 105 as well as in the surroundings. Due to the closed design of the differential pressure sensor 106, the pressure changes over the first membrane side 109-1 are detected. The differential pressure sensor 106 forms a difference between the detected pressure and the pressure prevailing in the pressure throttle chamber 111 reference pressure. In this way, the influence of the pressure fluctuations in the environment of the household appliance 100 is reduced.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

100100
Haushaltsgeräthousehold appliance
101101
Korpuscorpus
103103
Türdoor
105105
Innenrauminner space
106106
DifferenzdrucksensorDifferential Pressure Sensor
107107
TüröffnungshilfeDoor opening aid
109109
Sensormembransensor diaphragm
109-1-109-1-
erste Membranseitefirst membrane side
109-2109-2
zweite Membranseitesecond membrane side
110110
Druckkammerpressure chamber
111111
DruckdrosselkammerPressure throttle chamber
113113
Steuerungcontrol
201201
Druckverlaufpressure curve
201-1201-1
erster Druckverlaufsabschnittfirst pressure gradient section
201-2201-2
zweiter Druckverlaufsabschnittsecond pressure gradient section
203203
SteigungsumkehrpunktSlope reversal point
205205
Grenzeborder
207207
Grenzeborder
208208
DifferenzdruckdachwertDifferential pressure value roof
210210
DifferenzdruckdachwertDifferential pressure value roof
301301
DifferenzdruckverlaufDifferential pressure curve
303-3303-3
stärkere Steigung des Differenzdruckverlaufsstronger slope of the differential pressure curve
303303
untere Druckverlaufsgrenzelower pressure gradient
305305
obere Druckverlaufsgrenzeupper pressure gradient limit
401401
Druckanschlusspressure connection
403403
Druckleitungpressure line
405405
Seitenwandungsidewall
407407
Abschlussgraduation

Claims (16)

  1. Household appliance (100) comprising a carcass (101), a door (103) for closing an internal space (105), a differential pressure sensor (106) having a sensor membrane (109) for detecting a pressure difference between an internal air pressure in the internal space (105) and an external air pressure in an external space, a door-opening aid (107) for assisting the door opening process and a controller for controlling the door-opening aid (107) as a function of the detected pressure difference, characterised in that the controller is designed to detect a pressure profile (201) of the pressure difference, and to control the door-opening aid (107) as a function of said detected pressure profile (201).
  2. Household appliance (100) according to claim 1, characterised in that the controller is designed to activate the door-opening aid (107) if the detected pressure profile (201) lies within a predetermined pressure profile corridor.
  3. Household appliance (100) according to claim 1 or claim 2, characterised in that the controller is designed to compare a gradient of the detected pressure profile (201) with at least one gradient threshold value in order to identify whether the detected pressure profile (201) lies within a predetermined pressure profile corridor, and to activate the door-opening aid (107) only when the detected pressure profile (201) lies within the predetermined pressure profile corridor.
  4. Household appliance (100) according to one of the preceding claims, characterised in that the controller is designed to detect a gradient reversal of the detected pressure profile (201), and to activate the door-opening aid (107) if the gradient reversal is present.
  5. Household appliance (100) according to one of the preceding claims, characterised in that the controller is designed to detect a positive gradient of the detected pressure profile (201) up to the gradient reversal, and to detect a negative gradient of the detected pressure profile (201) after the gradient reversal, and to activate the door-opening aid (107) only when the positive gradient of the pressure profile (201) and the negative gradient of the pressure profile (201) lie within a predetermined pressure profile corridor.
  6. Household appliance (100) according to one of the preceding claims, characterised in that the controller (113) is designed to activate the door-opening aid (107) or amplify the effect thereof in the event of an increase in a gradient of the detected pressure profile (201).
  7. Household appliance (100) according to one of the preceding claims, characterised in that the controller (113) is designed to activate the door-opening aid (107) if the pressure profile (201) having negative pressure difference values drops below the pressure profile corridor.
  8. Household appliance (100) according to one of the preceding claims, characterised in that the sensor membrane (109) has a first membrane side (109-1), which faces the internal space (105) and a second membrane side (109-2), which faces away from the internal space (105), and in that the second membrane side (109-2) is surrounded by a pressure damping chamber (111), and in that said pressure damping chamber (111) is designed to damp the external air pressure at least partially.
  9. Household refrigerator according to claim 8, characterised in that the differential pressure sensor (106) is arranged in a carcass (101).
  10. Household appliance (100) according to claim 8 or claim 9, characterised in that the pressure damping chamber (111) encloses the second membrane side (109-2) fully or at least partially.
  11. Household appliance (100) according to one of the preceding claims 8 to 10, characterised in that the pressure damping chamber (111) is designed to provide a reference pressure or to damp the external air pressure.
  12. Household appliance (100) according to one of the preceding claims 8 to 11, characterised in that the pressure damping chamber (111) has a pressure damping element, in particular a damping orifice or a damping stage, which is provided for monotonic pressure equalisation between an interior of the pressure damping chamber (111) and the external space.
  13. Household appliance (100) according to one of the preceding claims 8 to 12, characterised in that the controller (113) has a controller circuit board having an electrical circuit, and in that the controller circuit board forms a wall of the pressure damping chamber (111) or closes the pressure damping chamber (111).
  14. Household appliance (100) according to one of the preceding claims, characterised in that the door (103) can be opened by a mechanical push on the door (103), and the controller (113) is designed to activate the door-opening aid (107) in the event of an increase in the detected pressure difference, or in that the door (103) can be opened by a mechanical pull on the door (103), and in that the controller (113) is designed to activate the door controller in the event of a reduction in the detected pressure difference.
  15. Method for controlling an activatable door-opening aid (107) for assisting an opening of an appliance door (103) in a household appliance (100), which has a carcass (101), a door (103) for closing an internal space (105), a differential pressure sensor (106) having a sensor membrane (109) for detecting a pressure difference between an internal air pressure in the internal space (105) and an external air pressure outside the external space, characterised in that a pressure profile (201) of the pressure difference is detected within a time interval, and in that the door-opening aid (107) is activated as a function of the detected pressure profile (201).
  16. Method according to claim 14, characterised in that the controller (113) activates the door-opening aid (107) only when the detected pressure profile (201) lies within a predetermined pressure profile corridor.
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DE102015210113.4A DE102015210113A1 (en) 2015-06-02 2015-06-02 Household appliance with differential pressure sensor
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DE102015210113A1 (en) 2016-12-29
EP3303955A1 (en) 2018-04-11
US10392855B2 (en) 2019-08-27
US20180155975A1 (en) 2018-06-07
WO2016192990A1 (en) 2016-12-08

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