Abnormality diagnosing apparatus of exhaust gas sensor

Details Abnormality diagnosing apparatus of exhaust gas sensor Abnormality diagnosing apparatus of exhaust gas sensor

2005-12-20

2005-12-20

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Gas or liquid analyzer

C073S023310, C073S023320, C073S114220, C073S117020, C060S272000, C060S276000, C060S277000, C701S029000, C701S099000, C701S101000, C340S438000, C340S439000

Reexamination Certificate

active

06976382

ABSTRACT:
At a time point at which an ignition switch is made OFF and an engine is stopped, an output of a downstream gas sensor is read, thereafter, at a time point at which a predetermined time period has elapsed from stopping the engine, the output of the downstream gas sensor changed by flowing the atmosphere back into an exhaust pipe is read. Thereafter, a change in the output of the downstream gas sensor until the predetermined time period has elapsed from stopping the engine is calculated, the change in the output is compared with an abnormality determinant and when the change in the output is smaller than the abnormality determinant, response of the downstream gas sensor is determined to be abnormal.

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patent: 10-169501 (1998-06-01), None

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