Exhaust emission control device of internal combustion engine
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United States of America Patent
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-
Sep 16, 2003
Grant Date -
Oct 17, 2002
app pub date -
Mar 15, 2002
filing date -
Jul 24, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A NOx catalyst in the exhaust passage of an internal combustion engine is capable of lean burn and adapted to release and reduce absorbed NOx by a reducing agent. Reducing agent supplier is provided in the exhaust passage on the upstream side of the NOx catalyst. A load detector detects the load of an internal combustion engine. Reducing agent addition controller controls the reducing agent addition period and the reducing agent addition interval based on the load of the internal combustion engine, whereby sufficient reducing agent is supplied to the NOx catalyst side independently of the operating condition.
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