Title:
METHOD FOR OPERATING A MIXED POTENTIAL EXHAUST SENSOR AND CIRCUIT CONFIGURATIONS FOR CARRYING OUT SAID METHOD
Document Type and Number:
WIPO Patent Application WO2001023730
Kind Code:
A3
Abstract:
The invention relates to a method for operating a mixed potential exhaust sensor for an internal combustion engine. According to the invention, the sensor is provided with a heatable ceramic sensor body, with a first electrode disposed in a chamber that is exposed to a reference atmosphere, and with a second electrode disposed in the exhaust gas of the internal combustion engine that detects gas molecules. Between the first and the second electrode a pump voltage is applied by means of a pump voltage source so that in the interior of the chamber a slightly reduced oxygen partial pressure is adjusted due to the electrochemical pumping of the oxygen molecules. The inventive method is characterized in that a constant, external voltage is applied to the electrodes that deviates from the thermodynamic equilibrium voltage of the desired reaction and that the current potential between the electrodes is measured and evaluated.
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Inventors:
MUELLER BERND (DE)
BRINZ THOMAS (DE)
SCHUMANN BERND (DE)
BRINZ THOMAS (DE)
SCHUMANN BERND (DE)
Application Number:
PCT/DE2000/003384
Publication Date:
June 07, 2001
Filing Date:
September 28, 2000
Export Citation:
Assignee:
BOSCH GMBH ROBERT (DE)
MUELLER BERND (DE)
BRINZ THOMAS (DE)
SCHUMANN BERND (DE)
MUELLER BERND (DE)
BRINZ THOMAS (DE)
SCHUMANN BERND (DE)
International Classes:
G01N27/406; G01N27/409; G01N27/407; G01N27/416; (IPC1-7): G01N27/407
Foreign References:
| US5630920A | 1997-05-20 | |||
| GB2119933A | 1983-11-23 | |||
| US5344548A | 1994-09-06 |
Other References:
See also references of EP 1144829A2
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