Low temperature emission control
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United States of America Patent
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Sep 21, 2010
Grant Date -
Nov 27, 2008
app pub date -
May 21, 2007
filing date -
May 21, 2007
priority date (Note) -
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Abstract
A method of controlling an engine having a lean NOx trap in the exhaust is described. The method comprises during a first mode, at a first temperature, storing NOx at a lean condition and then purging stored NOx from the NOx trap at a rich condition without concurrently supplying oxygen to the trap during the purging and during a second mode, at a second, lower temperature, storing NOx at a lean condition and then purging stored NOx from the NOx, where an exothermic reaction is generated to temporarily raise the temperature of the trap by supplying oxygen and reductants with an overall rich mixture to the trap during the purging.
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