Method and apparatus for maintaining catalyst efficiency of a NO.sub.x trap
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Mar 27, 1997
filing date -
Mar 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An engine control computer estimates the cumulative NO.sub.x storage in a NO.sub.x trap based on engine operating conditions and enters a NO.sub.x purge mode of operation when a maximum storage capacity limit, based on trap temperature, is exceeded. The purge mode is terminated when NO.sub.x storage level decreases below a minimum storage capacity limit. The rate of NO.sub.x dissipation is also based on trap temperature.
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