EP0528173A1 - Four à démarrage de nettoyage par pyrolyse commandé par un capteur - Google Patents

Four à démarrage de nettoyage par pyrolyse commandé par un capteur Download PDF

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Publication number
EP0528173A1
EP0528173A1 EP92111995A EP92111995A EP0528173A1 EP 0528173 A1 EP0528173 A1 EP 0528173A1 EP 92111995 A EP92111995 A EP 92111995A EP 92111995 A EP92111995 A EP 92111995A EP 0528173 A1 EP0528173 A1 EP 0528173A1
Authority
EP
European Patent Office
Prior art keywords
sensor
evaluation circuit
cleaning
sensor system
pyrolytic self
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
EP92111995A
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German (de)
English (en)
Other versions
EP0528173B1 (fr
Inventor
Helmut Dipl.-Ing. Waigand
Gottfried Dipl.-Ing. Wallner
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0528173A1 publication Critical patent/EP0528173A1/fr
Application granted granted Critical
Publication of EP0528173B1 publication Critical patent/EP0528173B1/fr
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
    • 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 stove with pyrolytic self-cleaning
  • the muffle can be operated by a heating element arranged in at least one wall area and possibly with additional circulating air heating, the muffle being ventilated by a circulating air blower and equipped with means for pyrolytic self-cleaning.
  • the object of the invention is to provide electronic means which objectively justify pyrolytic cleaning processes.
  • the arrangement according to the invention for solving this problem is characterized in that a sensor system which detects operational oven contamination values is arranged in the cooking chamber, that the sensor system is connected to the input of an evaluation circuit, that the evaluation circuit frequency-converts, digitizes, counts, stores and concatenates the input values of the sensor system, that the evaluation circuit signals a degree of contamination on the output side and that the evaluation circuit recommends and / or carries out pyrolysis initiation.
  • FIG. 1 shows an oven with oven mode 1, an oven with only microwave mode 2, a sensor 3, an oscillator with connected frequency converter 4, a digitizing stage 5, a JK flip-flop 6 and a clock generator 7.
  • sensor 3 should be switched on and the contamination values registered by it should be evaluated.
  • This contamination sensor consists of an enamelled metal plate with conductor tracks, which are preferably intertwined in a U-shape. If a change in capacitance of the sensor is achieved as a result of the oven operation, for example due to grease drops or other contamination values affecting the metal tracks, this means a change in frequency of the oscillator which is subsequently connected.
  • the sensor 3 works on the input side on an oscillator and frequency converter stage 4, with each frequency change being converted into a voltage change. A subsequent digitization stage 5 enables a technically simple way of counting the frequency changes of the oscillator stage 4.
  • an OR element 8, a counter 9, a chaining logic 10, a decryption logic 11.1, 11.2, 11.3 and 11.4, a memory 12, a JK flip-flop 13 and a query button 14 can be seen.
  • the processed and processed sensor signals pass from the JK flip-flop 6 via the OR element 8 to the counter 9, which lists the sensor signal sequences.
  • the counter 9 is reset when a self-cleaning process begins. On the output side, the counter 9 is connected to the chaining logic 10. In addition, the output of the counter 9 is led to a memory 12 which contains the current status of the counter 9. In the event of a power failure, the memory content of the memory 12, which cannot be influenced by this, can be read back into the counter 9 at any time. This memory is also reset with a self-cleaning process.
  • the chaining logic feeds the decryption logic 11.1 to 11.4 and also leads a bundling of chaining signals back to the counter 9 via a JK flip-flop.
  • the housewife can query the degree of contamination of her oven.
  • heavy soiling can be signaled or, if the housewife wishes, pyrolytic self-cleaning can be initiated automatically will.
  • the decryption logic uses a display to show the various degrees of contamination from a clean stove to very dirty after each query.
  • an embodiment of the contamination sensor is shown, which shows a base plate 21 and conductor tracks 22 and 23.
  • the requirements for the sensor in particular electrical requirements and structural requirements, are determined by the extreme conditions that occur during pyrolysis.
  • the sensor which is arranged on an enamelled profiled sheet strip unit, should be temperature-resistant up to 500 ° C, have an oxidation-free conductor track, be abrasion-resistant and allow appropriate contacting leading to the rear.
  • the electrical requirements are that there must in particular be high electrical contact resistances between the conductor tracks and between conductor tracks and base plate, which can be of the order of 5 megohms.
  • the contact resistance to the conductor track should be very small, ie the conductor tracks must not form a high-resistance oxide layer.
  • the conductor track has an electrical resistance over the required temperature range, which changes only insignificantly.
  • the sensor consists of at least two conductor tracks which are arranged insulated from one another on an enamelled metal plate, the two sensor conductor tracks having a U-shape and being arranged opposite one another in such a way that in each case one Immerse the U-leg in the open, opposite U.
  • the sensor is preferably arranged in a lateral wall area of the muffle. It is therefore desirable to have a special, each muffle-specific and pollution-typical side wall is selected so that only one sensor needs to be used for pyrolytic self-cleaning.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Processing Of Solid Wastes (AREA)
  • Electric Ovens (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Cookers (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Electric Stoves And Ranges (AREA)
EP92111995A 1991-08-19 1992-07-14 Four à démarrage de nettoyage par pyrolyse commandé par un capteur Expired - Lifetime EP0528173B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4127388A DE4127388A1 (de) 1991-08-19 1991-08-19 Herd mit sensorgesteuertem pyrolysestart
DE4127388 1991-08-19

Publications (2)

Publication Number Publication Date
EP0528173A1 true EP0528173A1 (fr) 1993-02-24
EP0528173B1 EP0528173B1 (fr) 1995-02-01

Family

ID=6438609

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92111995A Expired - Lifetime EP0528173B1 (fr) 1991-08-19 1992-07-14 Four à démarrage de nettoyage par pyrolyse commandé par un capteur

Country Status (5)

Country Link
US (1) US5343020A (fr)
EP (1) EP0528173B1 (fr)
AT (1) ATE118082T1 (fr)
DE (2) DE4127388A1 (fr)
ES (1) ES2068653T3 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5964211A (en) * 1996-11-20 1999-10-12 Maytag Corporation Pyrolytic self-cleaning gas oven
DE19706186A1 (de) * 1997-02-17 1998-08-20 Miele & Cie Backofen und Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
US6417493B1 (en) 1999-09-13 2002-07-09 Maytag Corporation Self-cleaning method for a cooking appliance
US6316749B1 (en) 2000-08-29 2001-11-13 Maytag Corporation Self-cleaning system for a cooking appliance
US6232584B1 (en) * 1999-12-15 2001-05-15 Whirlpool Corporation System for controlling a self cleaning oven having catalyst temperature control
US6784404B2 (en) 2000-07-12 2004-08-31 Whirlpool Corporation System for controlling the duration of a self-clean cycle in an oven
US6392204B2 (en) 2000-07-12 2002-05-21 Whirlpool Corporation System for controlling the duration of a self-clean cycle in an oven
DE10128024B4 (de) * 2001-06-08 2006-07-06 BSH Bosch und Siemens Hausgeräte GmbH Gargerät
DE202004018718U1 (de) * 2004-12-03 2006-04-13 Rational Ag Gargerät zum komplett automatischen Garen
DE202007014318U1 (de) 2007-10-12 2007-12-13 Rational Ag Anzeigeeinrichtung zur Anzeige des Pflegezustands eines Gargeräts
KR20110006824A (ko) * 2009-07-15 2011-01-21 삼성전자주식회사 오염도 센서와 이를 갖는 조리장치 및 그 제어방법
US9731333B2 (en) 2013-01-07 2017-08-15 Electrolux Home Products, Inc. Self-cleaning top burner for a stove
DE102017206058A1 (de) 2017-04-10 2018-10-11 BSH Hausgeräte GmbH Bestimmen eines Verschmutzungsgrads in einem Garraum
EP3862634A1 (fr) 2020-02-05 2021-08-11 Vestel Elektronik Sanayi ve Ticaret A.S. Four autonettoyant pour la cuisson d'aliments et procédé de nettoyage pour un four autonettoyant
US12010409B2 (en) * 2021-12-22 2024-06-11 Whirlpool Corporation Camera view port dedicated self cleaning cycles

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481404A (en) * 1982-12-22 1984-11-06 General Electric Company Turn-off control circuit for self-cleaning ovens
EP0380733A1 (fr) * 1989-01-31 1990-08-08 Matsushita Electric Industrial Co., Ltd. Cuisinière munie d'une fonction pour le nettoyage automatique d'encrassements déposés aux parois internes
EP0459131A1 (fr) * 1990-05-31 1991-12-04 Bosch-Siemens HausgerÀ¤te GmbH Four à nettoyage par pyrolyse
DE9112786U1 (de) * 1991-10-14 1991-12-12 Bosch-Siemens Hausgeräte GmbH, 8000 München Anzeige des Herdverschmutzungsgrades

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1938908A1 (de) * 1969-07-31 1971-02-11 Licentia Gmbh Kuechenherd
US4051347A (en) * 1972-11-24 1977-09-27 Siemens Aktiengesellschaft Method and apparatus for baking food in a closed cooking space in which heated air is circulated
US5040724A (en) * 1989-12-11 1991-08-20 Eaton Corporation Electronic control system for an oven

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4481404A (en) * 1982-12-22 1984-11-06 General Electric Company Turn-off control circuit for self-cleaning ovens
EP0380733A1 (fr) * 1989-01-31 1990-08-08 Matsushita Electric Industrial Co., Ltd. Cuisinière munie d'une fonction pour le nettoyage automatique d'encrassements déposés aux parois internes
EP0459131A1 (fr) * 1990-05-31 1991-12-04 Bosch-Siemens HausgerÀ¤te GmbH Four à nettoyage par pyrolyse
DE9112786U1 (de) * 1991-10-14 1991-12-12 Bosch-Siemens Hausgeräte GmbH, 8000 München Anzeige des Herdverschmutzungsgrades

Also Published As

Publication number Publication date
DE4127388A1 (de) 1993-02-25
ES2068653T3 (es) 1995-04-16
US5343020A (en) 1994-08-30
EP0528173B1 (fr) 1995-02-01
ATE118082T1 (de) 1995-02-15
DE59201329D1 (de) 1995-03-16

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