Exhaust gas purification apparatus in an internal combustion engine
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United States of America Patent
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Feb 24, 2015
Grant Date -
Aug 5, 2010
app pub date -
Jul 9, 2008
filing date -
Jul 11, 2007
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Abstract
An apparatus that raises temperature of a post-catalyst at an early time while suppressing reducing agent poisoning of the post-catalyst and discharge of a reducing agent into the outside when a pre-catalyst and the post-catalyst are arranged in series in an exhaust passage of an internal combustion engine in order from an upstream side thereof. The pre-catalyst is arranged to allow an exhaust gas to flow between an outer peripheral surface thereof and an inner peripheral surface of the exhaust passage. A reducing agent addition valve adding a reducing agent to allow the reducing agent to pass through the pre-catalyst is arranged immediately upstream of the pre-catalyst in the exhaust passage. Further, a retention catalyst is arranged in the exhaust passage between the pre-catalyst and the post-catalyst, to temporarily retain the reducing agent in the exhaust gas.
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