Method and apparatus for maintaining catalyst efficiency of a NO

Details Method and apparatus for maintaining catalyst efficiency of a NO Method and apparatus for maintaining catalyst efficiency of a NO

1997-03-27

1999-04-20

Ryznic, John E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60285, 60301, F01N 300

Patent

active

058947256

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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