EP2287533A1 - Méthode pour contrôler le fonctionnement d'un four - Google Patents

Méthode pour contrôler le fonctionnement d'un four Download PDF

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Publication number
EP2287533A1
EP2287533A1 EP10171808A EP10171808A EP2287533A1 EP 2287533 A1 EP2287533 A1 EP 2287533A1 EP 10171808 A EP10171808 A EP 10171808A EP 10171808 A EP10171808 A EP 10171808A EP 2287533 A1 EP2287533 A1 EP 2287533A1
Authority
EP
European Patent Office
Prior art keywords
fan
temperature
oven
muffle
control unit
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.)
Granted
Application number
EP10171808A
Other languages
German (de)
English (en)
Other versions
EP2287533B1 (fr
Inventor
Lorenzo Morbidelli
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.)
Whirlpool EMEA SpA
Original Assignee
Indesit Co SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Indesit Co SpA filed Critical Indesit Co SpA
Priority to PL10171808T priority Critical patent/PL2287533T3/pl
Publication of EP2287533A1 publication Critical patent/EP2287533A1/fr
Application granted granted Critical
Publication of EP2287533B1 publication Critical patent/EP2287533B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F24C15/00—Details
    • F24C15/006—Arrangements for circulation of cooling air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • 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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/082—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination
    • F24C7/085—Arrangement or mounting of control or safety devices on ranges, e.g. control panels, illumination on baking ovens

Definitions

  • the present invention relates to a method for controlling the operation of an oven according to the preamble of claim 1, as well as to an oven implementing such a method.
  • ovens in particular built-in ones, include a cooling fan which sucks air from the external environment and circulates it within an interspace between the muffle and the outermost structure of the oven.
  • the electronic control unit of the oven is typically placed, which is thus cooled by the air sucked by the fan.
  • the cooling fan In order to prevent the electronic control unit from overheating, the cooling fan is normally kept turned on for the entire cooking cycle.
  • patent JP2004047305 proposes to vary the fan revolution speed as a function of the heating element in use.
  • Air circulation caused by the cooling fan also has the effect of extracting fumes through the muffle chimney; therefore, said fan also operates as a fume extractor fan.
  • Patent US2005077288 discloses the idea of adjusting the operation of a fume extractor fan (in particular its speed or the instant at which it is turned on) depending on the selected cooking program or on the humidity inside the muffle. Although effective, these patents do not deal with improving the energetic efficiency of the oven.
  • the air circulation within the interspace of the oven in fact, has the effect of extracting the air from the muffle and partially cooling the walls thereof, so that, as a result, the oven requires more energy to complete the cooking process.
  • the present invention is based on the idea of controlling the operation of the cooling fan depending on the selected cooking program and on the temperature of the electronic control unit.
  • the temperature of the control unit is sampled at regular intervals, and the fan is turned on when the temperature of the control unit exceeds a reference value.
  • the cooling fan is turned on at a speed which depends on the difference between the measured temperature and said reference value.
  • the fan is turned on frequently at a high speed to extract a large part of the humidity present in the muffle, whereas during the initial step of the cooking cycle, i.e. when the muffle is warming up, the fan stays off to avoid extracting too much heat.
  • the speed at which the fan is operated is in any case lower than or equal to a maximum value which depends on the selected cooking program or on which heating elements are being used in the cooking process.
  • the fan operating time may also be adjusted as a function of the difference between the measured temperature and the reference temperature.
  • the fan is always operated at the same preset speed, while the fan operating time depends on the difference between the measured temperature and the reference temperature.
  • this solution is characterised by a slower response to the increase in the temperature of the electronic components, which are hence more subject to the risk of failure, but it provides a more gradual reduction of the humidity in the muffle, so that it may be more suitable for some kinds of cooking programs, such as steam cooking programs.
  • Fig. 1 shows a kitchen cabinet 1 with a built-in refrigerator 2 and an oven 3 being flush-mounted inside a recess 4 of the cabinet.
  • the oven 3 is fitted with a control panel 5 comprising knobs 6 and a display 7, through which the user can select the cooking parameters, in particular temperature and time, and possibly preset cooking programs as well.
  • Fig. 1 also shows the shell 8 acting as an outer body of the oven and enclosing the rear portion thereof, while in front there is a door 9 provided with a handle 10 and an inspection glass 11.
  • Fig. 2 shows a front view of the oven 3 with the door 9 open.
  • reference numeral 28 shows a baking pan positioned inside the cooking compartment.
  • Fig. 3 shows a vertical section of the oven 3.
  • the oven is an electric one and includes, inside the muffle 12, a pair of heating elements which, in this example, consist of a grill resistor 14 located in the proximity of the muffle ceiling and a circular resistor 15 located on the side opposite to the door 9.
  • a fan 16 driven by a motor 17; the fan is mounted with its axis of rotation concentric to the circular resistor 15, so that when the resistor is heated the rotating fan will generate a hot air flow inside the oven.
  • the fan is located behind a guard 18 consisting of a perforated panel mounted on the vertical side of the muffle.
  • Rotation of the fan 21 external to the muffle generates a flow F of air which is drawn from the outside environment through a number of apertures 22 obtained in the base of the shell 8 and then flows out of the oven through the interspace 12.
  • the electronic control unit 20 which is connected to the control panel 5 through cables 23 for receiving the user's commands and displaying useful information on the display 7, e.g. information about the selected cooking program. Through electric connections 24, the control unit 20 controls the activation of the fans 16 and 21 and of the resistors 14 and 15, so as to appropriately adjust the temperature inside the oven.
  • the control unit 20 is positioned in a manner such as to be hit by the air flow generated by the fan 21.
  • the interspace 19 is in fluidic communication with the muffle 12 through the chimney 25.
  • the air circulation caused by the fan 21 within the interspace 19 has therefore the effect of extracting the fumes from the muffle 12.
  • a temperature sensor 26 which detects a temperature in the proximity of the control unit 20.
  • this temperature sensor is mounted on the same printed circuit board (PCB) that accommodates other components, such as a microcontroller, of the control unit 20.
  • PCB printed circuit board
  • the temperature sensor 26 is operationally connected to the control unit 20, so that the latter can receive the information about the temperature detected by the sensor 26.
  • control unit 20 controls the operation of the fan 21 as a function of the temperature measured by the sensor 26. Because the electronic control unit can still operate properly up to temperatures of 45-50°C, the fan will only be turned on when the sensor detects a temperature which might damage the control unit, or anyway which might cause it to malfunction.
  • the fan is turned on or off depending on the temperature measured in the proximity of the electronic control unit, i.e. depending of what may be defined as control unit temperature.
  • the fan 21 also acts as an extractor of the fumes from the muffle 12, said fan 21 is also controlled in a manner such as to keep inside the muffle 12 a correct humidity level for the cooking program selected by the user or for a specific cooking step of the selected program.
  • the control unit 20 will thus control the fan 21 in such a way as to keep the degree of humidity within a proper range to ensure good cooking results, without at the same time dissipating too much energy.
  • the temperature gradient in the proximity of the control unit will vary, so that, in order to save energy, the fan may be operated at a different speed according to how many and/or which elements are on.
  • the fan will be operated at a lower speed if the elements are off.
  • This type of control can be accomplished by using a humidity sensor 27 located in the muffle and operationally connected to the control unit 20.
  • the fan is controlled as a function of the ongoing program or cooking step, or else as a function of the active heating elements (in this example, the resistors 14 and 15).
  • the fan 21 is controlled depending on the difference between the temperature measured by the sensor 26 and a reference value.
  • control unit 20 is provided with a suitable control algorithm which adjusts the fan revolution speed to a value that depends on said temperature difference.
  • control unit 20 samples the temperature at regular intervals, and at each reading it determines whether the fan must be turned on or not and, if yes, at what speed.
  • the fan 21 is operated at a speed which depends on both the temperature measured in the proximity of the electronic unit and the cooking type.
  • the maximum revolution speed of the fan is set according to the type of cooking being carried out or to the active heating elements.
  • V max is the maximum speed set for the ongoing cooking cycle or cooking step
  • ⁇ T max is a preset value
  • ⁇ is a constant obtained empirically and preferably dependent on the type of cooking program being carried out.
  • Fig. 4 shows the trend of the curves of the temperature measured in the proximity of the control unit and of the fan speed as a function of time, when the speed is calculated according to (1).
  • the fan 21 is off, so that the temperature measured in the proximity of the electronic control unit rises quickly due to the muffle 12 warming up and to the hot air flowing out of the chimney 25.
  • the temperature is measured by the sensor 26, and it is detected that it is lower than the reference temperature T ref , beyond which the fan must be turned on.
  • the temperature is equal to T ref , and therefore the fan stays off.
  • the temperature measured in the proximity of the control unit still exceeds T ref , but ⁇ T is smaller than ⁇ T max ; consequently, the fan is turned on at a speed v 1 , lower than v max and calculated, for example, according to the equation (1).
  • the measured temperature is lower than T ref , and therefore the fan is turned off.
  • a time t6 the temperature exceeds T ref and the difference with respect to the reference temperature is equal to what was measured at time t4, so that the fan is turned on at the same speed v 1 .
  • the fan revolution speed may be chosen by using other mathematical laws which relate the fan speed to the measured temperature and to the ongoing cooking program.
  • the law that regulates the fan revolution speed depends on at least two temperature values measured in the chamber; in particular, it depends both on the measured instantaneous temperature and on historical temperature values, i.e. values previously measured by the control unit.
  • Such a type of control which also takes into account historical temperature readings, may be attained through a PID (Proportional-Integral-Derivative) controller and a memory area (possibly internal to the PID controller) which stores the temperature values measured in the cooking chamber by the sensor 26.
  • PID Proportional-Integral-Derivative
  • the values stored in this memory area represent the history of the cooking chamber temperatures and are used by the PID controller along with the measured instantaneous temperature in order to determine the actual speed at which the fan must be operated.
  • v max is the maximum speed set for the ongoing cooking cycle or cooking step
  • ⁇ 1 , ⁇ 2 and ⁇ 3 are constants obtained empirically and preferably dependent on the type of cooking program being carried out
  • t start and t end are two time instants which delimit the time interval that defines the "history" to be taken into account, e.g. a time interval which ends at the instant when the actual speed is calculated and whose length equals the time e
  • t start may be t1 or t2 or the oven start-up time.
  • the fan 21 may be turned on for a predetermined time period shorter than the time elapsing between a temperature reading and the next.
  • the on time of the fan depends on the temperature measured by the sensor 26.
  • the greater the difference between the measured temperature and the reference temperature the longer the fan on time within the time interval between a temperature reading and the next.
  • the fan on time may also depend on the cooking type and/or on the state of the muffle heating elements.
  • the fan will stay on more or less depending on the type of cooking being carried out or on the active heating elements.
  • the fan is always operated at a speed v max which depends on the ongoing cooking program or step or on the active heating elements.
  • the fan stays on for a time which depends on the detected temperature difference and on the selected cooking program.
  • t max is the maximum time set for the ongoing cooking cycle or cooking step
  • ⁇ is a constant obtained empirically and preferably dependent on the type of cooking program being carried out.
  • t max is equal to the time interval between two successive readings; however, t max may also be longer than said interval; in such a case, the speed will be updated every t max .
  • the temperature measured in the proximity of the control unit is still higher than T ref , but ⁇ T is smaller than ⁇ T max ; consequently, the fan is turned on for a shorter time.
  • the on time of the fan 21 may be calculated by means of an equation which also takes into account the historical temperature trend in the cooking chamber.
  • Said temperature trend is stored in a memory area accessible to the control unit, as previously stated with reference to the use of a PID controller for calculating the fan operating speed.
  • t max is the maximum time set for the ongoing cooking cycle or cooking step
  • ⁇ T is the difference between the temperature measured by the sensor 26 and the reference temperature
  • ⁇ 1 , ⁇ 2 and ⁇ 3 are constants obtained empirically and preferably dependent on the type of cooking program being carried out
  • t start and t end are two time instants which delimit the time interval that defines the "history" to be taken into account, as described above with reference to the equation (2).
  • the maximum fan operating speed may be determined as a function of the humidity measured inside the muffle or of the temperature inside the muffle. In these two cases, the maximum speed will vary dynamically during the cooking cycle.
  • the invention is also applicable to ovens having a different arrangement of the various elements other than the one described with reference to Figs. 1 to 3 .
  • the oven control unit may be located upstream of the fan 21, provided that it is still hit and cooled by an air flow generated by the fan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Ovens (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Temperature (AREA)
EP10171808.8A 2009-08-04 2010-08-03 Méthode pour contrôler le fonctionnement d'un four Active EP2287533B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10171808T PL2287533T3 (pl) 2009-08-04 2010-08-03 Sposób sterowania działaniem kuchenki

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000611A ITTO20090611A1 (it) 2009-08-04 2009-08-04 Metodo per controllare il funzionamento di un forno

Publications (2)

Publication Number Publication Date
EP2287533A1 true EP2287533A1 (fr) 2011-02-23
EP2287533B1 EP2287533B1 (fr) 2017-03-22

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ID=42286721

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10171808.8A Active EP2287533B1 (fr) 2009-08-04 2010-08-03 Méthode pour contrôler le fonctionnement d'un four

Country Status (3)

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EP (1) EP2287533B1 (fr)
IT (1) ITTO20090611A1 (fr)
PL (1) PL2287533T3 (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012012859A1 (fr) * 2010-07-27 2012-02-02 Whirlpool S.A. Four de cuisson
WO2012150227A1 (fr) 2011-05-02 2012-11-08 Arcelik Anonim Sirketi Four dont la consommation d'énergie est réduite
EP2913590A1 (fr) * 2014-02-28 2015-09-02 Miele & Cie. KG Appareil de cuisson et procédé de fonctionnement
EP3018419A1 (fr) * 2014-11-07 2016-05-11 Candy S.p.A. Four à cuisson
CN105996805A (zh) * 2016-07-15 2016-10-12 九阳股份有限公司 一种家用电烤炉的控制方法
CN106136955A (zh) * 2015-04-24 2016-11-23 浙江绍兴苏泊尔生活电器有限公司 炸锅
CN106510491A (zh) * 2016-09-19 2017-03-22 九阳股份有限公司 采用热风煎烤食物的食品加工机的煎烤方法及控制装置
DE102015225581A1 (de) * 2015-12-17 2017-06-22 Convotherm Elektrogeräte GmbH Verfahren zum Betreiben eines gewerblichen Gargeräts
EP3312513A1 (fr) * 2016-10-17 2018-04-25 MIWE Michael Wenz GmbH Dispositif de traitement thermique des denrées alimentaires impliquant des buées de cuisson à réglage dynamique d'air extrait
US10721948B1 (en) * 2017-02-08 2020-07-28 Electrolux Home Products, Inc. Air sous-vide
DE102019209075A1 (de) * 2019-06-24 2020-12-24 BSH Hausgeräte GmbH Betreiben eines Haushalts-Gargeräts mit Kühllüfter
EP2570732B1 (fr) * 2011-09-16 2021-04-21 RATIONAL Aktiengesellschaft Procédé de cuisson d'un produit alimentaire dans un appareil de cuisson
EP3985309A1 (fr) * 2020-07-03 2022-04-20 LG Electronics Inc. Appareil de cuisson et procédé de commande pour un appareil de cuisson

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209541A1 (de) * 1982-03-16 1983-09-29 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Backofen
DE9115013U1 (de) * 1991-12-03 1992-02-06 Bosch-Siemens Hausgeräte GmbH, 8000 München Schaltungsanordnung zur Kühllüftersteuerung für ein Haushaltgerät
EP0579074B1 (fr) * 1992-07-06 1996-04-24 Miele & Cie. GmbH & Co. Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud
EP0889672A2 (fr) * 1997-07-04 1999-01-07 Whirlpool Corporation Système de ventilation pour appareils de cuisson comprennant un plan de cuisson et un four
EP1156282A1 (fr) * 2000-05-17 2001-11-21 V-Zug AG Four de cuisson à dispositif de purge
US20030218002A1 (en) * 2002-02-13 2003-11-27 Fulton Steven J. Oven temperature control
JP2004047305A (ja) 2002-07-12 2004-02-12 Matsushita Electric Ind Co Ltd 加熱調理器
US20050077288A1 (en) 2001-06-12 2005-04-14 Bsh Bosch Und Siemens Hausgerate Gmbh Cooking appliance with an extractor fan
WO2006048748A2 (fr) * 2004-11-08 2006-05-11 Indesit Company S.P.A. Four dote d'une disposition amelioree des elements internes
EP1816402A2 (fr) * 2006-02-06 2007-08-08 BSH Bosch und Siemens Hausgeräte GmbH Four
US20080066661A1 (en) * 2006-09-14 2008-03-20 Miele & Cie. Kg Method for controlling the exhaust flow from a cooking chamber of a baking oven

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3209541A1 (de) * 1982-03-16 1983-09-29 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Backofen
DE9115013U1 (de) * 1991-12-03 1992-02-06 Bosch-Siemens Hausgeräte GmbH, 8000 München Schaltungsanordnung zur Kühllüftersteuerung für ein Haushaltgerät
EP0579074B1 (fr) * 1992-07-06 1996-04-24 Miele & Cie. GmbH & Co. Four de cuisson à ventilateur de refroidissement et/ou à ventilateur à air chaud
EP0889672A2 (fr) * 1997-07-04 1999-01-07 Whirlpool Corporation Système de ventilation pour appareils de cuisson comprennant un plan de cuisson et un four
EP1156282A1 (fr) * 2000-05-17 2001-11-21 V-Zug AG Four de cuisson à dispositif de purge
US20050077288A1 (en) 2001-06-12 2005-04-14 Bsh Bosch Und Siemens Hausgerate Gmbh Cooking appliance with an extractor fan
US20030218002A1 (en) * 2002-02-13 2003-11-27 Fulton Steven J. Oven temperature control
JP2004047305A (ja) 2002-07-12 2004-02-12 Matsushita Electric Ind Co Ltd 加熱調理器
WO2006048748A2 (fr) * 2004-11-08 2006-05-11 Indesit Company S.P.A. Four dote d'une disposition amelioree des elements internes
EP1816402A2 (fr) * 2006-02-06 2007-08-08 BSH Bosch und Siemens Hausgeräte GmbH Four
US20080066661A1 (en) * 2006-09-14 2008-03-20 Miele & Cie. Kg Method for controlling the exhaust flow from a cooking chamber of a baking oven

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012012859A1 (fr) * 2010-07-27 2012-02-02 Whirlpool S.A. Four de cuisson
WO2012150227A1 (fr) 2011-05-02 2012-11-08 Arcelik Anonim Sirketi Four dont la consommation d'énergie est réduite
US9657952B2 (en) 2011-05-02 2017-05-23 Arcelik Anonim Sirketi Reducing the energy consumption of an oven
EP2570732B1 (fr) * 2011-09-16 2021-04-21 RATIONAL Aktiengesellschaft Procédé de cuisson d'un produit alimentaire dans un appareil de cuisson
EP2913590A1 (fr) * 2014-02-28 2015-09-02 Miele & Cie. KG Appareil de cuisson et procédé de fonctionnement
EP3018419A1 (fr) * 2014-11-07 2016-05-11 Candy S.p.A. Four à cuisson
CN106136955A (zh) * 2015-04-24 2016-11-23 浙江绍兴苏泊尔生活电器有限公司 炸锅
DE102015225581A1 (de) * 2015-12-17 2017-06-22 Convotherm Elektrogeräte GmbH Verfahren zum Betreiben eines gewerblichen Gargeräts
CN105996805A (zh) * 2016-07-15 2016-10-12 九阳股份有限公司 一种家用电烤炉的控制方法
CN105996805B (zh) * 2016-07-15 2019-06-18 九阳股份有限公司 一种家用电烤炉的控制方法
CN106510491B (zh) * 2016-09-19 2019-07-12 九阳股份有限公司 采用热风煎烤食物的食品加工机的煎烤方法及控制装置
CN106510491A (zh) * 2016-09-19 2017-03-22 九阳股份有限公司 采用热风煎烤食物的食品加工机的煎烤方法及控制装置
EP3312513A1 (fr) * 2016-10-17 2018-04-25 MIWE Michael Wenz GmbH Dispositif de traitement thermique des denrées alimentaires impliquant des buées de cuisson à réglage dynamique d'air extrait
US10721948B1 (en) * 2017-02-08 2020-07-28 Electrolux Home Products, Inc. Air sous-vide
US11457651B1 (en) 2017-02-08 2022-10-04 Electrolux Home Products, Inc. Air sous-vide
DE102019209075A1 (de) * 2019-06-24 2020-12-24 BSH Hausgeräte GmbH Betreiben eines Haushalts-Gargeräts mit Kühllüfter
WO2020260131A1 (fr) 2019-06-24 2020-12-30 BSH Hausgeräte GmbH Fonctionnement d'un appareil de cuisson domestique comportant un ventilateur de refroidissement
EP3985309A1 (fr) * 2020-07-03 2022-04-20 LG Electronics Inc. Appareil de cuisson et procédé de commande pour un appareil de cuisson

Also Published As

Publication number Publication date
ITTO20090611A1 (it) 2011-02-05
EP2287533B1 (fr) 2017-03-22
PL2287533T3 (pl) 2017-07-31

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