Abnormality detection device for air-fuel ratio sensor

Details Abnormality detection device for air-fuel ratio sensor Abnormality detection device for air-fuel ratio sensor

2005-10-25

2005-10-25

Williams, Hezron (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

C073S023310, C073S023320

Reexamination Certificate

active

06957563

ABSTRACT:
A novel abnormality detection device for an air-fuel ratio sensor able to more accurately detect an abnormality, provided with an air-fuel ratio sensor arranged in an exhaust passage of an internal combustion engine for detecting an air-fuel ratio based on a current generated in accordance with a concentration of oxygen in the exhaust gas along with application of voltage and an air-fuel ratio sensor activating means for activating the air-fuel ratio sensor, wherein the activity of the air-fuel ratio sensor is maintained even after the internal combustion engine is stopped and an abnormality of the air-fuel ratio sensor is detected based on an output of the air-fuel ratio sensor upon and/or after the elapse of a first predetermined time after the internal combustion engine is stopped.

REFERENCES:
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patent: A 5-231216 (1993-09-01), None
patent: B2 6-3158 (1994-01-01), None
patent: A 11-153569 (1999-06-01), None
patent: A 2001-4580 (2001-01-01), None

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