Method and system for reducing NOx tailpipe emissions of a lean-burn internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 3, 2004
Grant Date -
Jun 26, 2003
app pub date -
Dec 18, 2002
filing date -
Mar 17, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully