Integrated method for controlling diesel engine emissions in CRT-LNT system
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United States of America Patent
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Apr 13, 2004
Issued Date -
N/A
app pub date -
Jan 21, 2003
filing date -
Jun 23, 1999
priority date (Note) -
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Abstract
A method for controlling diesel engine emissions is disclosed. The diesel engine's exhaust system has a NO.sub.x oxidation catalyst, a diesel particulate filter (DPF), and a lean NO.sub.x trap (LNT). The DPF is monitored to determine the need for regeneration. The LNT is monitored to determine the need for regeneration or desulfurization. A fuel injector is used to inject fuel upstream of the LNT under certain conditions, and a bypass may be used to bypass exhaust around the oxidation catalyst to provide richer or hotter exhaust to the LNT.
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