Apparatus, system, and method for regenerating an exhaust gas treatment device
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United States of America Patent
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Apr 17, 2012
Grant Date -
Sep 27, 2007
app pub date -
Mar 24, 2006
filing date -
Mar 24, 2006
priority date (Note) -
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Abstract
An apparatus, system, and method are disclosed for regenerating an exhaust gas treatment device. A controller module directs an injector to provide reductant to an exhaust gas treatment device over a plurality of rich intervals during a regeneration cycle. In addition, the controller module directs the injector to reduce the reductant provided to the exhaust gas treatment device over a lean interval between the rich intervals to create a lean environment within the exhaust gas treatment device. In one embodiment, the controller module modifies the reductant provided during each rich interval, the number of rich intervals, the length of the rich intervals, and the length of the lean intervals in response to an exhaust gas state.
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