Engine control system and method with lean catalyst and particulate filter
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United States of America Patent
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Jun 6, 2006
Grant Date -
Jul 5, 2001
app pub date -
Feb 22, 2001
filing date -
Aug 24, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method for controlling reductant added to an exhaust of an engine having a lean NOx catalyst and a particulate filter adjusts a reductant amount during particulate filter regeneration. The method adjusts the reductant amount to account for reducing agents released from the particulate filter that are experienced by the lean NOx catalyst. In addition, management of particulate filter regeneration is based on both an estimated amount of stored particles and conditions of the lean NOx catalyst. In this way, operation of both the particulate filter and the lean NOx catalyst can be optimized. Also, termination of particulate filter regeneration is determined based on operating conditions.
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