Abnormality diagnosis system and method for oxygen sensor
US6711932B2 · kind B2 · utility
22Cited by
1References
20Claims
0Family size
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Key dates
| Filing date | Jun 24, 2002 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Jun 24, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4175
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An oxygen sensor includes a detector to be positioned between the ambient air and the exhaust gas, which generates a voltage corresponding to a difference in oxygen partial pressure therebetween. A controller performs monitoring of the output voltage from the oxygen sensor and determines an occurrence of fracture in the detector when detecting the generation of a lean signal, which is a signal indicating the above-described difference in the oxygen partial pressure is small, being frequently more than a certain value, and carries out an abnormality diagnosis to the oxygen sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.