Nox control for an internal combustion engine
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United States of America Patent
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Issued Date -
Dec 30, 2004
app pub date -
Aug 20, 2004
filing date -
Oct 8, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An improved NOX control for an internal combustion engine having an exhaust system with a NOX storage catalyst (105) includes a gas composition sensor (110) upstream of the NOX catalyst. Whether the NOX catalyst is storing NOX onto the catalyst or purging NOX from the catalyst is estimated from the signal output from the gas composition sensor. The composition of exhaust gasses input to the catalyst is also estimated using variables like engine load, engine speed, engine temperature and space velocity of the exhaust gases. This enables the NOX flow rate input to the catalyst and the aggregate quantity of NOX stored on the catalyst to be estimated.
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