EP0537796B1 - Kochofen - Google Patents

Kochofen Download PDF

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Publication number
EP0537796B1
EP0537796B1 EP92119683A EP92119683A EP0537796B1 EP 0537796 B1 EP0537796 B1 EP 0537796B1 EP 92119683 A EP92119683 A EP 92119683A EP 92119683 A EP92119683 A EP 92119683A EP 0537796 B1 EP0537796 B1 EP 0537796B1
Authority
EP
European Patent Office
Prior art keywords
temperature
oven
microprocessor
pyrolysis
probe
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.)
Expired - Lifetime
Application number
EP92119683A
Other languages
English (en)
French (fr)
Other versions
EP0537796A3 (en
EP0537796A2 (de
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
Publication of EP0537796A2 publication Critical patent/EP0537796A2/de
Publication of EP0537796A3 publication Critical patent/EP0537796A3/fr
Application granted granted Critical
Publication of EP0537796B1 publication Critical patent/EP0537796B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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. It relates, more particularly, to a method of controlling the heating of such an oven during cleaning by pyrolysis.
  • Furnaces 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 present invention provides a new method for controlling an oven as described above.
  • the subject of the present invention is a method for controlling a pyrolysis cleaning oven as defined in claims 1 to 3.
  • 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 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 a type thermostat. electromechanical to control the interruption of electrical power supply to the 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 short-circuited.
  • the baking oven 10 conventionally includes a vault (or grill) resistance 11 and a hearth resistance 12 making it possible to cook food 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. Likewise, 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 in such a way that at each alternation of the AC sector (at frequency 50Hz) 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 alternation 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.
  • 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 under which such locking occurs will be described later.
  • the microprocessor 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 with the aid of a rotary button or of 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.
  • Resistance 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 shows a diagram corresponding to the program associated with the input 173 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 in the sector, permanently conductive. From this temperature of 180 ° C. fumes and carbon monoxide CO may be released due to incomplete combustion, and this all the more so at this temperature the catalyst (not shown) generally provided in the cooking chamber ceiling, 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 Claimant. In this way, as long as the catalyst is not primed, the organic waste which is usually found in the lower part of the oven, is not burnt.
  • the program again controls 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 power supplied to the resistors decreases significantly in order to limit the risk of exceeding this temperature of 500 ° C .
  • the microprocessor then 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 operation is stopped automatically, this stop also being controlled by the microprocessor 17.
  • the probe 31 also intervenes during the normal 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 the potentiometers 25 and 26 are directly controlled, the power supplied to the heating resistors 11 and 12.

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)
  • Constitution Of High-Frequency Heating (AREA)
  • Electric Stoves And Ranges (AREA)

Claims (3)

  1. Verfahren zur Steuerung eines Backofens mit Pyrolysereinigung und mit mindestens einem Unterhitze-Widerstand (12), einem Grillwiderstand (11), einem Mikroprozessor (17), der die an die Widerstände gelieferte Leistung steuert, einer Sonde (31) zur Messung der Temperatur im Inneren des Backofens, wobei diese Sonde ein Signal an den Eingang (17₇) des Mikroprozessors liefert, und mit einem Katalysator, der ab einer bestimmten Temperatur unterhalb der maximalen Betriebstemperatur bei der Pyrolyse wirksam wird, dadurch gekennzeichnet, daß bei der Pyrolysereinigung
    - zuerst die Widerstände mit maximaler Leistung gespeist werden, bis im Inneren des Backofens eine Temperatur T1 unterhalb der bestimmten Temperatur erreicht wird, jenseits der sich Rauch und Kohlenmonoxid bilden können,
    - dann die Speiseleistung der Widerstände verringert wird, bis die für die Aktivierung des Katalysators bestimmte Temperatur erreicht ist,
    - und erneut die Widerstände mit maximaler Leistung gespeist werden, bis die Pyrolysetemperatur erreicht ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Mikroprozessor über einen Ausgang (17₉) einen Steuerimpuls (34) zur Verriegelung der Zugangstür des Backofens liefert, wenn die Temperatur im Backofen einen vorbestimmten Wert überschreitet.
  3. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Sonde eine Widerstandssonde auf Platinbasis mit einer Genauigkeit von ±3°C für Temperaturen zwischen 60 und 500°C ist.
EP92119683A 1990-04-27 1991-04-23 Kochofen Expired - Lifetime EP0537796B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9005404A FR2661482A1 (fr) 1990-04-27 1990-04-27 Four de cuisson.
FR9005404 1990-04-27
EP91401072A EP0454568A1 (de) 1990-04-27 1991-04-23 Kochherd

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP91401072.3 Division 1991-04-23

Publications (3)

Publication Number Publication Date
EP0537796A2 EP0537796A2 (de) 1993-04-21
EP0537796A3 EP0537796A3 (en) 1993-05-12
EP0537796B1 true EP0537796B1 (de) 1995-08-23

Family

ID=9396173

Family Applications (2)

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

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP91401072A Withdrawn EP0454568A1 (de) 1990-04-27 1991-04-23 Kochherd

Country Status (4)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223656A1 (de) * 1992-07-17 1994-01-20 Bosch Siemens Hausgeraete Selbstreinigungsverfahren für Herde
ES2064280B1 (es) * 1993-06-08 1998-06-16 Bosch Siemens Hausgeraete Procedimiento de autolimpieza para cocinas
DE19758860B4 (de) * 1997-02-17 2007-06-06 Miele & Cie. Kg Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
US10865999B2 (en) * 2019-03-01 2020-12-15 Midea Group Co., Ltd. Targeted oven self-clean preheat temperature control
US11009238B2 (en) * 2019-03-01 2021-05-18 Midea Group Co., Ltd. Staged oven self-clean preheat temperature control

Family Cites Families (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
DE3329300A1 (de) * 1983-08-12 1985-02-28 Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart Anordnung zum ansteuern von heizzeitspannen und heizleistungen fuer herde
DE3528229A1 (de) * 1985-08-06 1987-02-12 Bosch Siemens Hausgeraete Anordnung zur ansteuerung von elektrischen verbrauchern in backoefen
US4908760A (en) * 1987-12-31 1990-03-13 Whirlpool Corporation Self-cleaning oven temperature control having multiple stored temperature tables

Also Published As

Publication number Publication date
DE69112403D1 (de) 1995-09-28
FR2661482B1 (de) 1995-02-03
FR2661482A1 (fr) 1991-10-31
EP0454568A1 (de) 1991-10-30
EP0537796A3 (en) 1993-05-12
ATE126875T1 (de) 1995-09-15
DE69112403T2 (de) 1996-02-01
EP0537796A2 (de) 1993-04-21

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