Exhaust gas purification device of internal combustion engine
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United States of America Patent
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Nov 1, 2005
Grant Date -
Feb 17, 2005
app pub date -
Sep 20, 2004
filing date -
Jun 23, 1998
priority date (Note) -
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Abstract
A catalyst (22) suitable for reduction of the NO.sub.x in an exhaust gas by ammonia in the presence of excess oxygen is arranged in the exhaust passage (18, 21) of an internal combustion engine. An aqueous urea solution is fed through a flow control valve (33) to the inside of the exhaust passage (21) upstream of the catalyst (22). When the temperature of the catalyst (22) is low, a large amount of the aqueous urea solution is fed to make the urea contained in the aqueous urea solution be stored in the catalyst (22). When the engine is accelerated and the temperature of the catalyst (22) rises, ammonia is released at a little at a time from the inside of the catalyst (22) and the NO.sub.x in the exhaust gas is reduced by the released ammonia.
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