Emission control system with a catalyst
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United States of America Patent
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Oct 2, 2001
Grant Date -
N/A
app pub date -
Jul 12, 1999
filing date -
Jul 12, 1999
priority date (Note) -
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Abstract
A reductant injection control strategy for controlling an amount of nitrogen oxide reducing agent injected upstream of a selective reduction catalyst uses an ammonia sensor located downstream of the catalyst. An open loop injection quantity is first determined based on operation conditions. Ammonia concentration detected downstream of the catalyst is controlled to a desired value, with the desired value based on catalyst temperature and the open loop injection quantity.
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