Deterioration detecting device for oxygen concentration sensor
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United States of America Patent
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May 9, 2006
Issued Date -
N/A
app pub date -
Apr 7, 2004
filing date -
Apr 23, 2003
priority date (Note) -
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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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