Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine
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United States of America Patent
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Dec 31, 2002
Grant Date -
N/A
app pub date -
Mar 17, 2000
filing date -
Mar 17, 2000
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Abstract
A method and apparatus for operating a lean-burn internal combustion engine in cooperation with an exhaust gas purification system having a three-way catalyst and a NO.sub.x trap located downstream of the three-way catalyst includes a controller which calculates current levels of tailpipe NO.sub.x during lean engine operating conditions based upon the difference between a determined instantaneous feedgas NO.sub.x concentration and a determined instantaneous trap efficiency. The controller discontinues lean engine operation when the tailpipe NO.sub.x, expressed in terms of either grams-per-mile or grams-per-hour, exceeds a predetermined threshold level, either instantaneously or as averaged over the course of a trap purge-fill cycle.
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