EP1837601A2 - Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four - Google Patents

Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four Download PDF

Info

Publication number: EP1837601A2
Authority: EP; European Patent Office
Prior art keywords: during; cooking chamber; oxygen concentration; heating; phase
Prior art date: 2006-03-20
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

EP07004627A

Other languages

German (de)

English (en)

Other versions

EP1837601B1 (fr

EP1837601A3 (fr

Inventor

Thomas Dr. Krümpelmann

Jürgen Scharmann

Ulrich Dr. Sillmen

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.)

Miele und Cie KG

Original Assignee

Miele und Cie KG

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.)

2006-03-20

Filing date

2007-03-07

Publication date

2007-09-26

2007-03-07 Application filed by Miele und Cie KG filed Critical Miele und Cie KG

2007-03-07 Priority to PL07004627T priority Critical patent/PL1837601T3/pl

2007-09-26 Publication of EP1837601A2 publication Critical patent/EP1837601A2/fr

2009-12-30 Publication of EP1837601A3 publication Critical patent/EP1837601A3/fr

2014-05-07 Application granted granted Critical

2014-05-07 Publication of EP1837601B1 publication Critical patent/EP1837601B1/fr

Status Not-in-force legal-status Critical Current

2027-03-07 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
- 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
- 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
- F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes

Definitions

the invention relates to a method for controlling a Pyrolysetivsvorgangs in an oven.
a method for controlling a pyrolysis cleaning process in an oven in which a gas sensor responding to the flue gases produced during the pyrolysis is used.
the heating power of the cooking chamber heating is reduced in order to reduce the amount of flue gas. If the concentration of flue gas falls below the critical value, we supply the cooking space heating again with the full heating power. In this way, an overload of the oxidation catalyst should be avoided.
the gas sensor used and the evaluation of its output signals must be adapted to the respective type of oven.
the US 4,954,694 shows a method for automatic completion of a Pyrolysecurisvorgangs in an oven, wherein after switching on the heating source, the oxygen concentration is measured in a Ab povertyweg and from the course of the measured values, the duration of the pyrolysis process is determined.
the DE 197 06 186 A1 a method in which the temperature of the catalyst is measured by means of a temperature sensor. When a certain temperature threshold is exceeded, which corresponds to a certain amount of smoke, the radiator is switched off to heat the cooking chamber. The radiator is not turned on again until the temperature of the catalyst has dropped below a threshold.
the invention thus has the problem of providing a method for controlling a pyrolysis cleaning process in an oven, in which a high accuracy of measurement can be achieved and which is applicable to a variety of different types of ovens.
the advantages attainable with the invention are, in particular, that a high measuring accuracy can be achieved and that the method is applicable to a variety of different types of ovens.
By measuring and evaluating the oxygen concentration is a recalibration of the designed as an oxygen sensor Gas sensors without much effort and outside the baking operation or pyrolysis enabled.
An adaptation to different types of oven or on gas sensors with different sensitivities to different gases is not required. Instead, here is a simple method with a high accuracy specified, which allows a high quality pyrolysis and thus a satisfactory cleaning result.
Another advantage is the use of a fixed time interval I for the caused by a low concentration of oxygen cut-off of the heating source for heating the cooking chamber.
the limit value GW for the oxygen concentration can be selected within wide suitable limits. Expediently, the limit value GW for the oxygen concentration is about 18% by volume.
the process according to the invention can in principle be used during the entire pyrolysis operation. This makes it possible to operate during the entire pyrolysis pyrolysis at the still permissible for a complete pyrolytic reaction of the pyrolysis flue gases lower limit of the oxygen concentration, limit GW, so that the shortest possible pyrolysis and the lowest possible energy consumption are possible.
the pyrolysis cleaning process comprises three phases, namely a heating phase until reaching a predetermined or automatically determined during the heating pyrolysis temperature T P of the cooking chamber, a holding phase whose duration corresponds to a predetermined or automatically determined during the heating time interval I 3 , during which the Pyrolysis temperature T P is kept substantially constant by means of a temperature control, and a cooling phase to achieve a predetermined final temperature of the cooking chamber, wherein the process steps a) to f) mentioned in claim 1 are carried out only during the heating phase.
the subsequent pyrolysis phases in particular the holding phase, in Dependence of the oxygen concentrations determined during the heating phase and the resulting shutdowns of the heating source with regard to the duration of the respective phase as well as the temperature in the cooking chamber can be optimized during this phase.
a particularly simple realization of the aforementioned embodiment provides that the duration of the holding phase I 3 and / or the height of the pyrolysis temperature T P in the cooking chamber during the holding phase I 3 as a function of the number caused by a too low oxygen concentration cut-outs of the heating source during the Heating phase in the evaluation circuit is automatically determined / be.
Another advantageous development of this embodiment provides that the duration of the holding phase I 3 and / or the height of the pyrolysis temperature T P in the cooking chamber during the holding phase I 3 as a function of the time interval I 4 , namely from the first by a too low Oxygen concentration caused by switching off until the end of the last caused by a too low oxygen concentration elimination of the heat source, average cooking space temperature in the evaluation circuit is automatically determined / will. As a result, the accuracy of the method is improved.
a further alternative development provides that the duration of the holding phase I 3 and / or the height of the pyrolysis temperature T P in the cooking chamber during the holding phase I 3 as a function of the sum of the switch off times of the heating source during the heating phase in the Evaluation circuit is automatically determined / be. In this way, the accuracy of the method is further improved.
a baking oven in which the inventive method is used.
the oven has a control panel 2 with a display 4 and 6 controls.
Of the Cooking chamber 8 is closed by a door 10, wherein the door 10 has a see-through disk 12.
Fig. 2 shows the oven in a sectional view from the side.
the oven has an electrical control 14 behind the control panel 2.
the resulting in the cooking chamber 8 during pyrolysis flue gases, so-called vapors, can escape via an exhaust path 16 in the free environment.
the path of the flue gases 17 is symbolized by arrows 18.
an oxidation catalyst 22 is arranged, at which the exhaust gases discharged through the exhaust path 16 17 are implemented in a manner known to those skilled.
an oxygen sensor 24 for detecting the oxygen concentration is arranged in the exhaust path 16.
the aforementioned components are connected in a manner known to those skilled in the art to the electrical controller 14 in a signal-transmitting manner.
the oxygen sensor 24 may also be arranged at another suitable location in the oven.
Fig. 3 shows the course of the cooking chamber temperature a and the oxygen concentration b as a function of time, on the abscissa in minutes, abbreviated min. is applied.
On the left ordinate is the cooking space temperature a in degrees Celsius, short ° C, applied.
the absolute oxygen concentration is given on the right ordinate in% by volume.
the oven has heavy contaminants 26 in the embodiment. See Fig. 2.
the user starts the pyrolysis cleaning process by means of the controls 6. He is guided and informed about the display 4 in a manner known to those skilled in the art.
the cooking chamber temperature a is at the beginning of the pyrolysis cleaning process, time 0 min., Room temperature, ie about 20 ° C.
the oxygen concentration corresponds to the oxygen concentration in the atmosphere, ie about 21% by volume.
a heating phase of the cooking chamber 8 is now by means of the heat source 20 by an alternating turning on and off of the heat source 20 by the electric control 14 to heated to a pyrolysis temperature T P , wherein the heat source 20 is turned on in each case for a first time interval I 1 and off for a second time interval I 2 .
the two time intervals I 1 and I 2 are previously determined and stored in the memory 141.
the cooking chamber 8 with a predetermined and stored in a memory 141 of the electric controller 14 speed, namely about 10 ° C per 1 min., Is heated, so that a similar heating rate as in the first Alternative results.
the oxygen concentration b in the cooking chamber 8 and thus also in the exhaust air path 16 begins to change. Due to the decomposing contaminants 26 resulting flue gases 17, which are discharged via the catalyst 22 and the exhaust path 16 to the free environment. These flue gases 17 and the resulting from the oxidation of the oxidation catalyst 22 products such as hydrogen and carbon dioxide displace the oxygen partially, so that the oxygen concentration in the cooking chamber 8 and in the exhaust path 16 decreases.
the output signal of the oxygen sensor 24 and thus the measured oxygen concentration b is continuously transmitted to the electrical control 14 at least during the heating phase and compared in an evaluation circuit 142 of the electric control 14 with a stored limit value GW for the oxygen concentration b, namely 18% by volume.
a stored limit value GW for the oxygen concentration b namely 18% by volume.
the heating source 20 is switched off or turned on by the electric control 14. If the oxygen concentration b drops below 18% by volume, the heating source 20 is switched off for a previously defined time interval I stored in the memory 141, in which case the time interval I corresponds to the duration of the second time interval I 2 . If the oxygen concentration b rises again above 18% by volume after the expiration of the time interval I, the heat source 20 is switched on again.
the oxygen concentration b decreases rapidly by more than 3% by volume to below 18% by volume.
the heating source 20 is switched off by the electric control 14 for a time interval I, which is shown in FIG. 3 by the decrease of the cooking chamber temperature a and the increase in oxygen concentration b is clearly visible.
the heating source 20 is switched on again, as explained above, and operated alternately.
the Oven temperature a rises again and the oxygen concentration b decreases again.
the above procedure is repeated, since the oxygen concentration b decreases again too much, namely below the limit value GW.
the electric controller 14 would have operated the oven for a further time interval I when the heating source 20 was switched off.
the heating phase described above is followed by a holding phase, during which a predetermined pyrolysis temperature T P is substantially constant by means of a temperature control realized by a temperature sensor 30 signal-connected in the cooking chamber 8 and temperature-controlled by the electric controller 14 is held.
a predetermined pyrolysis temperature T P is substantially constant by means of a temperature control realized by a temperature sensor 30 signal-connected in the cooking chamber 8 and temperature-controlled by the electric controller 14 is held.
both the duration of the holding phase I 3 as well as the pyrolysis temperature T P is determined during the heating phase and as a function of the oxygen concentration b during the heating phase, which will be explained in more detail below.
the duration of the holding phase I 3 and the pyrolysis temperature T P during the holding phase I 3 are automatically determined here as a function of the number of caused by a too low oxygen concentration b switching off the heat source 20 during the heating phase in the evaluation circuit 142. Since it came during the heating phase for a total of four shutdowns of the heat source 20 due to a low oxygen concentration b, the duration of the holding phase I 3 to the maximum value, namely 90 min., Selected automatically for the current Pyrolysetivsvorgang and adopted for the program flow. For the pyrolysis temperature T P 460 ° C is selected here and adopted for the program sequence. See Fig. 3.
the method according to the invention is terminated here when a cooking chamber temperature a of 400 ° C. is reached.
a high-quality evaluation is already possible.
this temperature is still below the value range for cooking chamber temperatures a suitable for pyrolysis.
other suitable and suitable end conditions suitable for the process of the invention are also conceivable.
the process according to the invention can then be carried out independently of the pyrolysis temperature T P.
I 3 90 min.
the duration of the holding phase I 3 and / or the height of the pyrolysis temperature T P in the cooking chamber 8 during the holding phase I 3 as a function of Sum of caused by a too low oxygen concentration b off times of the heat source 20 during the heating phase in the evaluation circuit 142 is automatically determined / are. This could be realized in a particularly simple manner by determining the duration of the holding phase I 3 from the addition of the sum of the switch-off times caused by a too low oxygen concentration b and a predetermined minimum duration I 3_MIN stored in the memory 141.
the cooking chamber 8 After the duration of the holding phase I 3 and the pyrolysis temperature T P , ie the cooking chamber temperature during the holding phase I 3 , have been selected in one of the aforementioned types for the further program sequence, the cooking chamber 8 in the manner explained above, up to T P on heated. As soon as T P has been reached, the holding phase I 3 begins; an integrated in the evaluation circuit 142 and not shown in detail timer is started and terminates the holding phase after the expiration of I 3 with the below explained in more detail transition to the cooling phase of Pyrolysetherapiesvorgangs.
the cooking chamber a is kept substantially constant by means of the already explained temperature control, while the oxygen concentration decreases steadily b due to the decrease of the decomposition products in the reaction of the flue gases 17 to the oxidation catalyst 22 in the course of progressive pyrolysis.
the oxygen concentration b has risen again to the value under atmospheric conditions, ie about 21% by volume, or 0% by volume deviation.
the cooking chamber temperature a in the present embodiment is reduced during a cooling phase by means of the already explained temperature control to a final temperature of here 70 ° C. If this cooking chamber temperature a is reached, the door 10, which is automatically locked during the start of the pyrolysis cleaning process, is unlocked again, so that it can be opened by the user without danger.
the cooling phase is not fully illustrated in FIG.
inventive method is not limited to the illustrated embodiment and the above alternative embodiments.
the time intervals I to I 4 and T P can be chosen within wide suitable limits.

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Engineering & Computer Science (AREA)
Chemical & Material Sciences (AREA)
Combustion & Propulsion (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Chemical Kinetics & Catalysis (AREA)
Electric Ovens (AREA)
Incineration Of Waste (AREA)

EP07004627.1A 2006-03-20 2007-03-07 Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four Not-in-force EP1837601B1 (fr)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
PL07004627T PL1837601T3 (pl)	2006-03-20	2007-03-07	Sposób sterowania procesem czyszczenia pyrolitycznego w piekarniku

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102006013093A DE102006013093B3 (de)	2006-03-20	2006-03-20	Verfahren zur Steuerung eines Pyrolysereinigungsvorgangs bei einem Backofen

Publications (3)

Publication Number	Publication Date
EP1837601A2 true EP1837601A2 (fr)	2007-09-26
EP1837601A3 EP1837601A3 (fr)	2009-12-30
EP1837601B1 EP1837601B1 (fr)	2014-05-07

Family

ID=37887314

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP07004627.1A Not-in-force EP1837601B1 (fr)	2006-03-20	2007-03-07	Procédé destiné à la commande d'un processus de nettoyage à pyrolyse dans un four

Country Status (5)

Country	Link
US (1)	US7812287B2 (fr)
EP (1)	EP1837601B1 (fr)
DE (1)	DE102006013093B3 (fr)
ES (1)	ES2470365T3 (fr)
PL (1)	PL1837601T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102013214848A1 (de)	2013-07-30	2015-02-05	BSH Bosch und Siemens Hausgeräte GmbH	Backofen mit Feuchtigkeitssensor und Luftmanagementsystem
DE102016221446A1 (de) *	2016-11-02	2018-05-03	BSH Hausgeräte GmbH	Kalibrieren eines Sauerstoffsensors eines Haushaltsgeräts

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US8086077B2 (en) *	2006-06-30	2011-12-27	Aperio Technologies, Inc.	Method for storing and retrieving large images via DICOM
ES2407558B1 (es) *	2010-01-29	2014-04-29	Fagor, S. Coop.	Método de auto-limpieza para un horno.
US10060632B2 (en) *	2013-10-02	2018-08-28	Samsung Electronics Co., Ltd.	Cooking apparatus and method of controlling the same
AT515374B1 (de)	2014-02-05	2016-06-15	Völkl Roland Dipl Ing	Türe, insbesondere Brandschutz- und Fluchttüre
DE102020121587A1 (de)	2020-08-18	2022-02-24	Miele & Cie. Kg	Pyrolytische Reinigung eines Gargerätes

Family Cites Families (6)

* 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
US4496817A (en)	1983-07-07	1985-01-29	General Electric Company	Automatic fire detection for a microwave oven
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
DE4127390A1 (de)	1991-08-19	1993-02-25	Bosch Siemens Hausgeraete	Automatisierbares, pyrolytisches selbstreinigungsverfahren
DE19706186A1 (de) *	1997-02-17	1998-08-20	Miele & Cie	Backofen und Verfahren zur Steuerung eines Pyrolysereinigungsvorganges
US6392204B2 (en)	2000-07-12	2002-05-21	Whirlpool Corporation	System for controlling the duration of a self-clean cycle in an oven

2006
- 2006-03-20 DE DE102006013093A patent/DE102006013093B3/de not_active Expired - Fee Related
2007
- 2007-03-07 ES ES07004627.1T patent/ES2470365T3/es active Active
- 2007-03-07 PL PL07004627T patent/PL1837601T3/pl unknown
- 2007-03-07 EP EP07004627.1A patent/EP1837601B1/fr not_active Not-in-force
- 2007-03-20 US US11/688,371 patent/US7812287B2/en not_active Expired - Fee Related

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102013214848A1 (de)	2013-07-30	2015-02-05	BSH Bosch und Siemens Hausgeräte GmbH	Backofen mit Feuchtigkeitssensor und Luftmanagementsystem
EP2848868A1 (fr)	2013-07-30	2015-03-18	BSH Bosch und Siemens Hausgeräte GmbH	Four de cuisson doté de capteur d'humidité et de système de gestion de l'air
DE102016221446A1 (de) *	2016-11-02	2018-05-03	BSH Hausgeräte GmbH	Kalibrieren eines Sauerstoffsensors eines Haushaltsgeräts

Also Published As

Publication number	Publication date
US7812287B2 (en)	2010-10-12
US20070217952A1 (en)	2007-09-20
PL1837601T3 (pl)	2014-09-30
DE102006013093B3 (de)	2007-04-12
ES2470365T3 (es)	2014-06-23
EP1837601B1 (fr)	2014-05-07
EP1837601A3 (fr)	2009-12-30

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