EP0528250B1 - Automatisierbares, pyrolytisches Selbstreinigungsverfahren - Google Patents

Automatisierbares, pyrolytisches Selbstreinigungsverfahren Download PDF

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Publication number
EP0528250B1
EP0528250B1 EP92113231A EP92113231A EP0528250B1 EP 0528250 B1 EP0528250 B1 EP 0528250B1 EP 92113231 A EP92113231 A EP 92113231A EP 92113231 A EP92113231 A EP 92113231A EP 0528250 B1 EP0528250 B1 EP 0528250B1
Authority
EP
European Patent Office
Prior art keywords
sensor
pyrolysis
pyrolytic self
cleaning process
automatable
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
EP92113231A
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German (de)
English (en)
French (fr)
Other versions
EP0528250A2 (de
EP0528250A3 (de
Inventor
Uwe Dipl.-Ing. Has
Gottfried Dipl.-Ing. Wallner
Helmut Dipl.-Ing. Waigand
Wolfgang Dipl.-Ing. Beifuss
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP0528250A2 publication Critical patent/EP0528250A2/de
Publication of EP0528250A3 publication Critical patent/EP0528250A3/de
Application granted granted Critical
Publication of EP0528250B1 publication Critical patent/EP0528250B1/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
    • 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 an automatable pyrolytic self-cleaning method for stoves, the muffle of which 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.
  • This pollution essentially consists of three components: Grease splashes of animal and vegetable type, sticky food residues on the muffle walls and condensation of vapors on the muffle walls.
  • the muffle walls are heated to a temperature of 480 to 500 ° C during the passage of a predetermined time-temperature profile and kept at a high temperature for a certain time, this time being an empirical value corresponds and does not reflect the actual conditions of the muffle contamination.
  • the relatively long-chain molecules of the dirt adhering to the walls of the muffle are subjected to a thermal cracking process as a result of long-term heating to over 450 ° C. and are thus converted into relatively short-chain degradation products, for example water, short hydrocarbons, aromatics and ash residues.
  • the gaseous degradation products are removed from the stove with the vent during self-cleaning. After self-cleaning, the remaining residues can be removed from the stove as ash.
  • the object of the invention is now to implement pyrolysis start, pyrolysis implementation and the end of pyrolysis in a sensor-controlled manner, depending on the actual contamination phase, and thus possibly to be automated.
  • the solution to this problem according to the invention is characterized in that in the cooking chamber an operational oven-contamination value sensor is arranged, that an evaluation unit connected on the input side to the contamination sensor initiates or recommends the pyrolysis start, that a gas sensor connected to the evaluation unit for pyrolytic self-cleaning is arranged in the exhaust air path of the muffle, that the evaluation unit analyzes the sensor signals with a logic system adapted to the pyrolysis operation, that after a typical pyrolysis operating time, the evaluation unit detects a contamination type-dependent pyrolysis temperature and determines an optimized total pyrolysis time and that the evaluation unit ends the pyrolytic self-cleaning after a total pyrolysis time caused by the type of contamination.
  • An advantageous embodiment of the invention is characterized in that the evaluation circuit frequency-converts, digitizes, enumerates, stores and concatenates the input values of the contamination sensor, that the evaluation circuit signals a degree of contamination on the output side and recommends or carries out pyrolysis initiation.
  • a further advantageous embodiment of the invention is characterized in that the evaluation unit, which is partially equipped with an unsharp logic system, predetermines the total pyrolysis time required depending on the degree of contamination, is corrected in relation to the sensor signal, and switches off the heating elements after these times have elapsed.
  • the sensor 2 indicated in the cooking chamber mainly works as a capacitive contamination sensor, one of the possible embodiments of the contamination sensor being determined in that the sensor consists of at least two conductor tracks which are arranged insulated from one another on an enamelled metal sheet, the two sensor conductor tracks U- Have shape and are arranged opposite each other in such a way that one U-leg dips into the open, opposite U.
  • the sensor 2 is preferably arranged in a lateral wall area of the muffle.
  • the sensor 2 On the output side, the sensor 2 is connected to the part of the evaluation unit that compresses the values of the pollution sensor 2 until a pyrolysis start is given objectively.
  • This part of the evaluation unit is identified by 4.
  • the evaluation unit 4 treats the input values of the contamination sensor by converting, digitizing, counting, storing and linking this frequency, then signaling a degree of contamination on the output side and recommending or carrying out pyrolysis initiation.
  • the part of the evaluation unit that is necessary for the pyrolysis procedure is connected to the gas sensor, which is arranged in the exhaust air path of the furnace muffle.
  • the evaluation unit 5 uses an adapted logic system to analyze these sensor signals and, after a typical pyrolysis operating time, forms a minimum pyrolysis temperature depending on the type of contamination and an optimized total pyrolysis time.
  • the evaluation unit 4, 5, which is partially equipped with an unsharp logic system predetermines the total pyrolysis time required depending on the degree of soiling, corrects it in relation to the sensor signal, and switches off the heating elements after these times have expired, the circulating air also being switched off. This situation is realized on the output side according to FIG. 1 with the evaluation unit part 5, which is led to a controller 6.
  • FIG. 2 and FIG. 3 represent diagrams which, in parametric assignment, represent different contamination values with the associated sensor signal profiles, which are generated by the gas sensor arranged in the exhaust air duct of the cooking space.
  • An automatable, pyrolytic self-cleaning process which is equipped with a sensor-controlled pyrolysis start and a sensor-controlled pyrolysis implementation, with an evaluation unit that has sharp and fuzzy logic, gives the cookers equipped with this a convenient convenience.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Baking, Grill, Roasting (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Physical Vapour Deposition (AREA)
  • Cleaning Or Drying Semiconductors (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)
EP92113231A 1991-08-19 1992-08-03 Automatisierbares, pyrolytisches Selbstreinigungsverfahren Expired - Lifetime EP0528250B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4127390 1991-08-19
DE4127390A DE4127390A1 (de) 1991-08-19 1991-08-19 Automatisierbares, pyrolytisches selbstreinigungsverfahren

Publications (3)

Publication Number Publication Date
EP0528250A2 EP0528250A2 (de) 1993-02-24
EP0528250A3 EP0528250A3 (de) 1993-04-14
EP0528250B1 true EP0528250B1 (de) 1995-02-01

Family

ID=6438611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113231A Expired - Lifetime EP0528250B1 (de) 1991-08-19 1992-08-03 Automatisierbares, pyrolytisches Selbstreinigungsverfahren

Country Status (4)

Country Link
EP (1) EP0528250B1 (es)
AT (1) ATE118083T1 (es)
DE (2) DE4127390A1 (es)
ES (1) ES2068658T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11959644B2 (en) 2019-09-27 2024-04-16 Ecolab Usa Inc. Validation of addition of cleaning chemistry to self-cleaning oven

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4321952B4 (de) * 1993-07-01 2004-05-27 BSH Bosch und Siemens Hausgeräte GmbH Herd mit pyrolitischer Selbstreinigung
DE19606571C2 (de) * 1996-02-22 2001-02-08 Gaggenau Werke Backofen mit pyrolytischer Reinigung sowie Verfahren zum Betrieb eines solchen Backofens
DE102006013093B3 (de) 2006-03-20 2007-04-12 Miele & Cie. Kg Verfahren zur Steuerung eines Pyrolysereinigungsvorgangs bei einem Backofen
KR20110006824A (ko) * 2009-07-15 2011-01-21 삼성전자주식회사 오염도 센서와 이를 갖는 조리장치 및 그 제어방법
DE102012200304A1 (de) * 2012-01-11 2013-07-11 BSH Bosch und Siemens Hausgeräte GmbH Gargerät mit Sensor für Garraum
WO2014102074A1 (en) * 2012-12-26 2014-07-03 Arcelik Anonim Sirketi Pyrolytic oven
DE102016104865B4 (de) 2016-03-16 2022-07-07 Miele & Cie. Kg Verfahren zum Betreiben eines Gargerätes
DE102017206058A1 (de) 2017-04-10 2018-10-11 BSH Hausgeräte GmbH Bestimmen eines Verschmutzungsgrads in einem Garraum
EP3495742A1 (en) * 2017-12-11 2019-06-12 Vestel Elektronik Sanayi ve Ticaret A.S. Arrangement for self-cleaning oven

Family Cites Families (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
US4954694A (en) * 1989-01-31 1990-09-04 Matsushita Electric Industrial Co., Ltd. Cooking oven having function to automatically clean soils attached to inner walls thereof
DE4017628A1 (de) * 1990-05-31 1991-12-05 Bosch Siemens Hausgeraete Herd mit pyrolytischer selbstreinigung
DE9112786U1 (de) * 1991-10-14 1991-12-12 Bosch-Siemens Hausgeräte GmbH, 8000 München Anzeige des Herdverschmutzungsgrades

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11959644B2 (en) 2019-09-27 2024-04-16 Ecolab Usa Inc. Validation of addition of cleaning chemistry to self-cleaning oven

Also Published As

Publication number Publication date
DE59201331D1 (de) 1995-03-16
EP0528250A2 (de) 1993-02-24
DE4127390A1 (de) 1993-02-25
EP0528250A3 (de) 1993-04-14
ATE118083T1 (de) 1995-02-15
ES2068658T3 (es) 1995-04-16

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