Exhaust system
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United States of America Patent
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-
Jul 23, 2002
Grant Date -
N/A
app pub date -
Feb 21, 2001
filing date -
May 15, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An exhaust system or an engine (12) includes a lean NOx catalytic device (18), and a heat exchanger (70) positioned upstream of the catalytic device (18). Control means (44, 46) controls a valve (36) to regulate exhaust gas flow through the heat exchanger (70) or along a bypass path (26). The heat exchanger (70) can cool the exhaust gases to ensure that the maximum operating temperature of the catalytic device (1) is not exceeded. During use, the heat exchanger (70) can be bypassed to allow high temperature purge cycles.
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