Exhaust gas purifier for internal combustion engine
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United States of America Patent
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-
Mar 25, 2008
Grant Date -
Oct 12, 2006
app pub date -
Apr 5, 2006
filing date -
Apr 8, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The exhaust gas purifier includes a fuel addition valve, an NOx catalytic converter, and a catalyst loaded PM filter. The catalyst temperature of catalyst loaded PM filter is increased to a target temperature by adding fuel to the exhaust gas from fuel addition valve, whereby PM trapped on the filter is purified. When the NOx catalytic converter is deteriorated, the target catalyst temperature of catalyst loaded PM filter is changed to a value larger than the target catalyst temperature when the NOx catalytic converter is in a normal state.
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