Deterioration determining apparatus and deterioration...

Details Deterioration determining apparatus and deterioration... Deterioration determining apparatus and deterioration...

2006-06-20

2006-06-20

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

C701S107000, C701S109000

Reexamination Certificate

active

07063081

ABSTRACT:
A deterioration determining apparatus and a deterioration determining method are applied to an engine in which a feedback control of an air-fuel ratio is performed by calculating an air-fuel ratio correction coefficient based on an output of an oxygen sensor, and response of the air-fuel ratio correction coefficient with respect to the output of the oxygen sensor is set so as to be variable. In the deterioration determining apparatus and the deterioration determining method, a deterioration determining value concerning a determination as to whether the oxygen sensor has deteriorated is set so as to be variable according to the set response of the air-fuel ratio correction coefficient with respect to the output of the oxygen sensor, and the determination as to whether the oxygen sensor has deteriorated is made based on an inversion cycle of the output of the oxygen sensor and the deterioration determining value.

REFERENCES:
patent: 5396765 (1995-03-01), Maruyama et al.
patent: A 4-350345 (1992-12-01), None
patent: A 6-50200 (1994-02-01), None
patent: A 8-101161 (1996-04-01), None
patent: A 11-166438 (1999-06-01), None

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