Device for purifying the exhaust gas of an internal combustion engine
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United States of America Patent
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-
Nov 20, 2007
Grant Date -
Dec 9, 2004
app pub date -
Apr 22, 2004
filing date -
Jul 21, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for purifying the exhaust gas of an internal combustion engine is disclosed. The device includes a particulate filter arranged in the exhaust system, which carries a catalyst for absorbing and reducing NO.sub.x. The catalyst absorbs NO.sub.x when the air-fuel ratio in the surrounding atmosphere thereof is lean and releases the absorbed NO.sub.x to purify NO.sub.x by reduction when the air-fuel ratio is stoichiometric or rich. The device further includes a catalytic apparatus for purifying NO.sub.x arranged in the exhaust system upstream of the particulate filter, which has an oxidation function.
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