Exhaust gas purifying device for an internal combustion engine

Details Exhaust gas purifying device for an internal combustion engine Exhaust gas purifying device for an internal combustion engine

2011-06-21

2011-06-21

Denion, Thomas E (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

Reexamination Certificate

active

07963101

ABSTRACT:
An exhaust gas purifying device for an internal combustion engine, comprises: a first catalyst (TWC7, example) having a reducing capability; a second catalyst (LNC9, example) provided downstream of the first catalyst, the second catalyst is adapted to trap NOx in a lean condition of air fuel ratio of an exhaust gas and reduce the trapped NOx in a rich condition of air fuel ratio of the exhaust gas; and an exhaust air fuel ratio control means for controlling an exhaust air fuel ratio to decrease the NOx in the first and second catalysts, wherein the exhaust air fuel ratio control means conducts NOx decreasing control suitable for the first catalyst when the second catalyst is in an inactive state and the first catalyst is in an active state, and wherein the exhaust air fuel ratio control means conducts NOx decreasing control suitable for the second catalyst after the second catalyst is activated.

REFERENCES:
patent: 5388403 (1995-02-01), Nagami et al.
patent: 6330796 (2001-12-01), Nishimura et al.
patent: 2004/0016227 (2004-01-01), Kitahara
patent: 1619373 (2006-01-01), None
patent: 2005-163591 (2005-06-01), None
patent: 2006-214320 (2006-08-01), None
patent: 2006-299886 (2006-11-01), None
Japanese Office Action for Application No. 2006-316528, dated Oct. 7, 2008.
European Search Report for Application No. EP07021730, dated Feb. 15, 2005.

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