EP0454568A1 - Four de cuisson - Google Patents

Four de cuisson Download PDF

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Publication number
EP0454568A1
EP0454568A1 EP91401072A EP91401072A EP0454568A1 EP 0454568 A1 EP0454568 A1 EP 0454568A1 EP 91401072 A EP91401072 A EP 91401072A EP 91401072 A EP91401072 A EP 91401072A EP 0454568 A1 EP0454568 A1 EP 0454568A1
Authority
EP
European Patent Office
Prior art keywords
temperature
oven
microprocessor
resistors
cooking
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.)
Withdrawn
Application number
EP91401072A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernard Delhomme
Didier Gouardo
Jean-Marie Gelineau
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.)
Compagnie Europeenne pour lEquipement Menager SA
Original Assignee
Compagnie Europeenne pour lEquipement Menager SA
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 Compagnie Europeenne pour lEquipement Menager SA filed Critical Compagnie Europeenne pour lEquipement Menager SA
Priority to EP92119683A priority Critical patent/EP0537796B1/fr
Publication of EP0454568A1 publication Critical patent/EP0454568A1/fr
Withdrawn legal-status Critical Current

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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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/08—Arrangement or mounting of control or safety devices
    • F24C7/087—Arrangement or mounting of control or safety devices of electric circuits regulating heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type

Definitions

  • the invention relates to a cooking oven, in particular of the pyrolysis cleaning type.
  • Cooking ovens heated by electrical resistances often have a pyrolysis cleaning position. This cleaning consists of heating the interior of the oven enclosure, using the electric cooking resistors, to a temperature of the order of 500 ° C. in order to burn the organic residues on the walls without, however, degrading the enamel which usually covers such walls.
  • a catalyst is generally used. Ovens of this type are described, for example, in French patents Nos. 2,365,927 and 2,588,641 in the name of the applicant.
  • the first threshold is the temperature of 250 ° C above which the catalyst becomes active and from which the resistors are supplied at their maximum power, while below this temperature the heating power must be limited in order to minimize the emission of fumes resulting from incomplete combustion in the absence of catalysis.
  • the second threshold is the temperature of 340 ° C, above which standards require that the oven door should no longer be opened.
  • the third and last threshold is the temperature of 480 ° C close to the maximum allowable temperature and from which the heating power must be limited in order not to risk exceeding the allowable temperature of 500 ° C.
  • the invention aims to simplify the production of such a pyrolysis cleaning oven.
  • the oven comprises a probe delivering an electric signal representing the temperature inside this oven and a microcontroller or the like for controlling the electric power supplied to the heating resistors and, preferably, locking the door of the oven.
  • the probe is for example a platinum resistance probe whose accuracy is more or less 3 ° C for temperatures between 60 and 500 ° C.
  • the probe and the microprocessor which are used to control the various functions associated with cleaning by pyrolysis, are also used to control the usual operation of the oven, i.e. its operation for cooking or heating.
  • an electronic type temperature measurement probe associated with a microprocessor is not incompatible with the use of an electromechanical type thermostat to control the interruption of power supply. resistors in the event of failure of the electronic circuit, in particular if an electronic switch, such as a triac, in series with a resistance is in short-circuit.
  • the invention has, according to another of its aspects, the aim of simplifying the control of the oven.
  • the oven includes a temperature measurement probe inside the cooking chamber delivering an electrical signal to a microprocessor or the like, the latter controlling the power supplied to the various electrical resistances so that the control on a cooking or heating position automatically leads to a preheating control, that is to say, in general, a supply of all the heating elements at their maximum power, until the temperature is reached desired, the resistor (s) corresponding to the commanded position being automatically alone (s) put into service after this preheating.
  • a preheating control that is to say, in general, a supply of all the heating elements at their maximum power
  • a light or sound signal alerts the user when the desired temperature is reached and when, thus, preheating stops.
  • the oven according to the invention is characterized in that it comprises automatic preheating means which are put into action when a control of at least one resistance of the oven is actuated, this preheating stops when the temperature desired is reached.
  • the cooking oven 10 conventionally includes a vault (or grill) resistor 11 and a hearth resistor 12 allowing food to be cooked placed on an intermediate shelf 13.
  • Resistors 11 and 12 are supplied in parallel by the AC power sector. resistor 11 is in series with a triac 15. Similarly, resistor 12 is in series with a triac 16.
  • the conduction of the triacs 15 and 16 is controlled by a microprocessor 17.
  • a microprocessor 17 For this purpose, an output 171 of the microprocessor 17 is connected to the trigger of the triac 15 via an interface circuit 18.
  • an output 172 is connected to the trigger of the triac 16 via another interface circuit 19.
  • microprocessor 17 has inputs 173, 174, 175 ... to which are applied binary signals representing addresses of programs in memory of the microprocessor 17.
  • the output 171 controls the conduction of the triac 15 so that at each alternation of the AC sector (at frequency 50 Hz) the triac is conductive for a time chosen as a function of the power which it is desired to have delivered by the resistor 11. This fraction of the duration of each half-cycle during which the resistor 11 is supplied is determined by the program in the microprocessor 17.
  • the programs of the microprocessor 17 control, by the output 172, the duration of conduction of the triac 16 at each alternation of the alternating current of the sector.
  • the inputs 173, 174 and 175, associated with keys, respectively 20, 21 and 22, allow preprogrammed operations, as will be seen below.
  • the microprocessor has an input 177 to which is applied, via an interface circuit 30, an electrical signal supplied by a thermocouple probe 31 which represents the temperature inside the enclosure of the oven 10.
  • the probe 31 is arranged inside this enclosure.
  • Another input 178 of the microprocessor 17 receives, via an interface circuit 321, a signal supplied by a variable resistor 32, or coding wheel, which represents the temperature desired by the user.
  • the display of this set temperature is carried out by an actuating member located on the control panel of the cooking appliance.
  • An output 179 of the microprocessor controls, via an interface circuit 331, a latch 34 for automatically locking or unlocking the door (not shown) for access to the oven. The circumstances in which such locking occurs will be described later.
  • the microprocessor also has two other inputs 1710 and 1711.
  • the input 1710 is connected to a variable resistor 25, or a coding wheel, via an interface circuit 251.
  • the microprocessor converts the value of the adjustable resistor 25 into a conduction time of the triac 15 at each alternation of the sector.
  • the value of the resistor 25 is determined by the user, for example using a rotary button or a cursor with linear displacement, as a function of the power supply that he desires for the resistor 11.
  • the input 1711 of the microprocessor 17 is connected to a variable resistor 26 (or coding wheel) via another interface circuit 261.
  • Resistor 26 plays, with respect to triac 16, the same role as that played by resistance 25 with respect to triac 15.
  • the commands on the inputs 173, 174 and 175, which represent preprogrammed commands, have priority over the commands on the inputs 1710 and 1711.
  • FIG. 3 a diagram corresponding to the program associated with the input 17 est which is intended to control cleaning by pyrolysis.
  • the time t is plotted on the abscissa and the temperature T is plotted on the ordinate.
  • Diagram 50 therefore represents the variation of temperature T in degrees C as a function of time t.
  • the power supplied to the resistors 11 and 12 is maximum, that is to say that the triacs 15 and 16 are, during each alternation of the sector, permanently conductive. From this temperature of 180 ° C fumes and carbon monoxide CO may be released due to incomplete combustion, especially since at this temperature the catalyst (not shown), generally provided in the ceiling of the oven, is not yet active. Under these conditions, once the temperature in the enclosure has exceeded 180 ° C (at time t1), the microprocessor controls a reduction in the power supplied to the resistors, in particular to the sole resistor 12, as described in the French patent. No. 2,588,641 in the name of the plaintiff. In this way, as long as the catalyst is not primed, the organic waste which is usually found in the lower part of the furnace, is not burnt.
  • the program again commands the power supply at full power of the resistors 11 and 12 in order to quickly reach the temperature of 500 ° C . From this temperature of 250 ° C the catalyst is active and there are therefore practically no more CO and smoke emissions.
  • the microprocessor delivers, when the temperature of 350 ° C has been reached (at time t3), a signal on its output 179 which actuates the latch 34 to prevent the opening of the oven access door.
  • This lock 34 remains closed as long as the temperature is above 350 ° C.
  • the microprocessor controls, for a time determined by its program, the maintenance of the supply of the resistors 11 and 12 so that the temperature remains at the value of 500 ° C. The judgment of operation takes place automatically, this stopping also being controlled by the microprocessor 17.
  • the probe 31 also intervenes during the usual operation of the oven, that is to say when recourse is made to specific cooking programs in the memory of the microprocessor and which are triggered by actuation of the keys 21, 22, etc., or when directly controlling, by potentiometers 25 and 26, the power supplied to the heating resistors 11 and 12.
  • the microprocessor can be used not only to control the power in the heating or cooking resistances and the locking, but also to automatically control the activation of other organs of the oven such as a fan during pyrolysis or during cooking, or the rotation of a spit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Control Of Resistance Heating (AREA)
  • Electric Ovens (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Baking, Grill, Roasting (AREA)
  • Electric Stoves And Ranges (AREA)
  • Constitution Of High-Frequency Heating (AREA)
EP91401072A 1990-04-27 1991-04-23 Four de cuisson Withdrawn EP0454568A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP92119683A EP0537796B1 (fr) 1990-04-27 1991-04-23 Four de cuisson

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005404 1990-04-27
FR9005404A FR2661482A1 (fr) 1990-04-27 1990-04-27 Four de cuisson.

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP92119683.8 Division-Into 1991-04-23

Publications (1)

Publication Number Publication Date
EP0454568A1 true EP0454568A1 (fr) 1991-10-30

Family

ID=9396173

Family Applications (2)

Application Number Title Priority Date Filing Date
EP91401072A Withdrawn EP0454568A1 (fr) 1990-04-27 1991-04-23 Four de cuisson
EP92119683A Expired - Lifetime EP0537796B1 (fr) 1990-04-27 1991-04-23 Four de cuisson

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP92119683A Expired - Lifetime EP0537796B1 (fr) 1990-04-27 1991-04-23 Four de cuisson

Country Status (4)

Country Link
EP (2) EP0454568A1 (enExample)
AT (1) ATE126875T1 (enExample)
DE (1) DE69112403T2 (enExample)
FR (1) FR2661482A1 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693790A1 (fr) * 1992-07-17 1994-01-21 Bosch Siemens Hausgeraete Procédé d'autonettoyage par pyrolyse pour des cuisinières.
ES2064280A2 (es) * 1993-06-08 1995-01-16 Bosch Siemens Hausgeraete Procedimiento de autolimpieza para cocinas
US20230151972A1 (en) * 2021-11-17 2023-05-18 BSH Hausgeräte GmbH Oven with specific catalyst, method

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19758860B4 (de) * 1997-02-17 2007-06-06 Miele & Cie. Kg Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
US11009238B2 (en) * 2019-03-01 2021-05-18 Midea Group Co., Ltd. Staged oven self-clean preheat temperature control
US10865999B2 (en) * 2019-03-01 2020-12-15 Midea Group Co., Ltd. Targeted oven self-clean preheat temperature control

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2391425A1 (fr) * 1977-05-16 1978-12-15 Cepem Four pyrolytique a rapidite de chauffe variable
DE2733362A1 (de) * 1977-07-23 1979-02-08 Weiss Kg Alfons Einrichtung zum garen eines gutes, insbesondere zum braten, backen oder grillen in einem backofen
US4369352A (en) * 1980-12-29 1983-01-18 General Electric Company Temperature control system facilitating cooking temperature calibration in self-cleaning oven
FR2550680A1 (fr) * 1983-08-12 1985-02-15 Bosch Siemens Hausgeraete Installation pour la preselection des temps et des puissances de chauffage pour cuisinieres
EP0213443A1 (de) * 1985-08-06 1987-03-11 Bosch-Siemens HausgerÀ¤te GmbH Anordnung zur Ansteuerung von elektrischen Verbrauchern in Backöfen
US4908760A (en) * 1987-12-31 1990-03-13 Whirlpool Corporation Self-cleaning oven temperature control having multiple stored temperature tables

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2391425A1 (fr) * 1977-05-16 1978-12-15 Cepem Four pyrolytique a rapidite de chauffe variable
DE2733362A1 (de) * 1977-07-23 1979-02-08 Weiss Kg Alfons Einrichtung zum garen eines gutes, insbesondere zum braten, backen oder grillen in einem backofen
US4369352A (en) * 1980-12-29 1983-01-18 General Electric Company Temperature control system facilitating cooking temperature calibration in self-cleaning oven
FR2550680A1 (fr) * 1983-08-12 1985-02-15 Bosch Siemens Hausgeraete Installation pour la preselection des temps et des puissances de chauffage pour cuisinieres
EP0213443A1 (de) * 1985-08-06 1987-03-11 Bosch-Siemens HausgerÀ¤te GmbH Anordnung zur Ansteuerung von elektrischen Verbrauchern in Backöfen
US4908760A (en) * 1987-12-31 1990-03-13 Whirlpool Corporation Self-cleaning oven temperature control having multiple stored temperature tables

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693790A1 (fr) * 1992-07-17 1994-01-21 Bosch Siemens Hausgeraete Procédé d'autonettoyage par pyrolyse pour des cuisinières.
ES2064280A2 (es) * 1993-06-08 1995-01-16 Bosch Siemens Hausgeraete Procedimiento de autolimpieza para cocinas
US20230151972A1 (en) * 2021-11-17 2023-05-18 BSH Hausgeräte GmbH Oven with specific catalyst, method

Also Published As

Publication number Publication date
EP0537796B1 (fr) 1995-08-23
DE69112403T2 (de) 1996-02-01
EP0537796A3 (en) 1993-05-12
FR2661482A1 (fr) 1991-10-31
FR2661482B1 (enExample) 1995-02-03
DE69112403D1 (de) 1995-09-28
ATE126875T1 (de) 1995-09-15
EP0537796A2 (fr) 1993-04-21

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