US5286943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensor-controlled oven pyrolysis utilizing fuzzy logic control
Assignee: BSH Hausgeräte GmbH
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Filing: 1992-08-19
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Granted: 1994-02-15
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Expires: 2012-08-19
Abstract
Abstract A stove with pyrolytic self-cleaning includes an oven having at least one wall region and an outgoing air path. A heating element is disposed in the at least one wall region for operating the oven. A forced-air and/or convection blower vents the oven. A forced-air and/or convection heater is optionally provided for the oven. A device is provided for pyrolytically self-cleaning the oven. A gas sensor is disposed in the outgoing air path for issuing sensor signals. An evaluation unit for pyrolytic self-cleaning is connected to the gas sensor. The evaluation unit has a logic system adapted to a pyrolysis operation for analyzing the sensor signals. The evaluation unit uses the sensor signals after a typical pyrolysis operating time to determine a minimum pyrolysis temperature and an optimized total pyrolysis time being dictated by a type of soiling.
Inventors
- 👤 Uwe Has
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
F; F24; F24C; F24C14/00; F24C14/02; Y; Y10; Y10S; Y10S706/00; Y10S706/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
151 words
A stove with pyrolytic self-cleaning, comprising: an oven having at least one wall region and an outgoing air path; a heating element disposed in said at least one wall region for operating said oven; a forced-air blower for venting said oven; means for pyrolytically self-cleaning said oven; a gas sensor disposed in said outgoing air path for issuing sensor signals; an evaluation unit for pyrolytic self-cleaning being connected to said gas sensor, said evaluation unit having a logic system adapted to a pyrolysis operation for analyzing the sensor signals, and said evaluation unit using the sensor signals after a typical pyrolysis operating time to determine a minimum pyrolysis temperature and an optimized total pyrolysis time being dictated by a type of soiling; and wherein for expected peak oven temperatures higher than 470° C., said evaluation unit increases a sampling frequency of the sensor signals before a temperature raised above 470° C.
Claim 2
Dependent Claim
151 words
A stove with pyrolytic self-cleaning, comprising: an oven having at least one wall region and an outgoing air path; a heating element disposed in said at least one wall region for operating said oven; a forced-air blower for venting said oven; means for pyrolytically self-cleaning said oven; a gas sensor disposed in said outgoing air path for issuing sensor signals; an evaluation unit for pyrolytic self-cleaning being connected to said gas sensor, said evaluation unit having a logic system adapted to a pyrolysis operation for analyzing the sensor signals, and said evaluation unit using the sensor signals after a typical pyrolysis operating time to determine a minimum pyrolysis temperature and an optimized total pyrolysis time being dictated by a type of soiling; and wherein for expected peak oven temperatures higher than 470° C., said evaluation unit increases a sampling frequency of the sensor signals before a temperature raised above 470° C.
Claim 3
Dependent Claim
16 words
The stove with pyrolytic self-cleaning according to claim 1, including a forced-air heater for said oven.
Claim 4
Dependent Claim
27 words
The stove with pyrolytic self-cleaning according to claim 1, wherein said gas sensor reacts with an evaluatable change in electrical resistance to short-chained hydrocarbons and hydrogen molecules.
Claim 5
Dependent Claim
57 words
The stove with pyrolytic self-cleaning according to claim 1, wherein said logic system of said evaluation unit is a partial fuzzy logic system for predetermining a necessary total pyrolysis time as a function of a degree of soiling, then correcting with reference to the sensor signals, and turning off said heating element after the times have elapsed.
Claim 6
Dependent Claim
31 words
The stove with pyrolytic self-cleaning according to claim 4, wherein said evaluation unit terminates venting of said oven with said forced-air blower after terminating a heat output from said heating element.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-14 | 1997-08-16 | 1998-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-14 | 2001-08-16 | 2002-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-14 | 2005-08-16 | 2006-02-15 | $7700.00 | Window Closed / Lapsed |