Exhaust gas purifier for internal combustion engine
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United States of America Patent
Stats
-
Feb 12, 2002
Grant Date -
Oct 25, 2001
app pub date -
Dec 8, 1999
filing date -
Jun 3, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An exhaust gas purifier for an internal combustion engine which is capable of detecting the deterioration degree of an NOx catalyst making use of a time elapsed from the time when the air-fuel ratio of exhaust gas flowing into an NOx absorber catalyst is made rich to the time when the air-fuel ratio of exhaust gas flowing out from the NOx absorber catalyst becomes rich. When the time required for a change in the output level of an air-fuel ratio sensor is shorter than a predetermined time, the time required for the change in the output level of the air-fuel ratio sensor is lengthened by reducing the rich degree at the time of rich operation, thereby judging the deterioration degree of the NOx absorber catalyst with accuracy.
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