Method and system for reducing vehicle tailpipe emissions when operating lean
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United States of America Patent
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Sep 24, 2002
Grant Date -
N/A
app pub date -
Jun 19, 2001
filing date -
Jun 19, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and system for operating a lean-burn internal combustion engine in cooperation with an exhaust gas purification system having an emission control device, wherein the system includes a controller which calculates current levels of a selected exhaust gas constituent, such as 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 device 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 device purge-fill cycle.
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