Deterioration detecting device for oxygen concentration sensor

Details Deterioration detecting device for oxygen concentration sensor Deterioration detecting device for oxygen concentration sensor

2006-05-09

2006-05-09

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

C060S274000, C060S276000

Reexamination Certificate

active

07040085

ABSTRACT:
Detecting deterioration of an oxygen concentration sensor disposed downstream of a catalyst. The air-fuel ratio is set to a rich air-fuel ratio, and then changed to a lean air-fuel ratio after an enrichment time period elapaes from the time of enrichment. A determination threshold is set according to a dead time period from the time the air-fuel ratio has been changed to the lean air-fuel ratio to the time the output from the oxygen concentration sensor reaches a first value. A change time period from the time the output from the oxygen concentration sensor reaches the first value to the time the output from the oxygen concentration sensor reaches a second value indicative of an oxygen concentration higher than an oxygen concentration corresponding to the first value, is measured. The oxygen concentration sensor is determined to be deteriorated when the change time period is greater than the determination threshold.

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