Exhaust emission control system for internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Jan 15, 2002
Grant Date -
N/A
app pub date -
Aug 31, 2000
filing date -
Sep 1, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust emission control system for a nitrogen oxide removing device, the control system having a first oxygen concentration sensor provided upstream of the nitrogen oxide removing device, a second oxygen concentration sensor provided downstream of the nitrogen oxide removing device. A first response delay time period from the time when the output value from the first oxygen concentration sensor has changed to a value indicative of a rich air-fuel ratio to the time when the output value from the second oxygen concentration sensor becomes a value indicative of a rich air-fuel ratio is measured. A second response delay time period from the time when the output value from the first oxygen concentration sensor has changed to a value indicative of a lean air-fuel ratio, to the time when the output value from the second oxygen concentration sensor becomes a value indicative of a lean air-fuel ratio is measured. Deterioration of the nitrogen oxide removing device is determined according to the first and second response delay time periods.
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