Exhaust-gas cleaning devices for engine
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United States of America Patent
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Apr 23, 2002
Grant Date -
Aug 9, 2001
app pub date -
Jan 17, 2001
filing date -
Jan 18, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust-gas cleaning device comprises an absorption quantity detector (22) for determining the first and second amounts of NO.sub.x and oxygen absorbed by a NO.sub.x -absorbing material and an oxygen-absorbing material during first and second reference times based on sensing signals fed from an oxygen concentration detector (11), a NO.sub.x quantity estimator (23) for obtaining first and second estimated values of the amount of NO.sub.x absorbed by the NO.sub.x -absorbing material during the first and second reference times in accordance with engine operating condition, and a deterioration detector (24) for making a judgment on deterioration of the NO.sub.x -absorbing material based on the first and second amounts of absorption of NO.sub.x and oxygen determined by the absorption quantity detector (22) and the first and second estimated values of the amount of NO.sub.x obtained by the NO.sub.x quantity estimator (23).
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