Engine exhaust purification device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Dec 17, 2002
Grant Date -
Sep 20, 2001
app pub date -
Feb 16, 2001
filing date -
Feb 17, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A controller controls an air-fuel ratio of an engine to maintain the oxygen storage amount of a catalyst provided in an exhaust passage at a predetermined amount. At this time, the controller first estimates the initial value of the oxygen storage amount based on the catalyst temperature on engine startup, and then computes an oxygen storage characteristic using this estimated initial value. In this way, the oxygen storage amount can be precisely computed even immediately after engine startup, and the conversion efficiency of the catalyst is maintained at a high level.
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