Exhaust gas purification device of internal combustion engine

Details Exhaust gas purification device of internal combustion engine Exhaust gas purification device of internal combustion engine

2006-08-08

2006-08-08

Nguyen, Tu M. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C060S295000, C060S301000, C060S303000

Reexamination Certificate

active

07086223

ABSTRACT:
A catalyst (22) suitable for reduction of the NOxin 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 NOxin the exhaust gas is reduced by the released ammonia.

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