Exhaust gas control apparatus for internal combustion engine
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United States of America Patent
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Dec 11, 2007
Grant Date -
Dec 7, 2006
app pub date -
Oct 14, 2004
filing date -
Oct 16, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A converter (70) which houses a NOx storage/reduction catalyst is provided in an exhaust passage (2) of an engine (1). At a front half portion (inlet side portion) (7a) of a carrier of the NOx storage/reduction catalyst in the converter (70), the amount of an oxygen storage component is made less than it is at a rear half portion (outlet side portion) (7b) of the carrier, and a NOx storage capacity is made larger than it is at the rear half portion (7b) of the carrier. As a result, unpurified NOx released from the front half portion (7a) of the carrier at the beginning of a rich spike due to an.sub.02 storage operation is able to be stored in the rear half portion (7b) of the carrier, and so is not exhausted outside the catalyst Moreover, the amount of HC and CO components in the exhaust gas that are needlessly consumed by the .sub.02 storage operation without being used to purify NOx is reduced, making it possible to purify NOx efficiently.
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