Exhaust gas purifying system for internal combustion engine

Details Exhaust gas purifying system for internal combustion engine Exhaust gas purifying system for internal combustion engine

2006-12-22

2010-11-23

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...

C060S286000, C060S299000, C060S301000

Reexamination Certificate

active

07836686

ABSTRACT:
An ECU controls a rich purge in the internal combustion engine by temporarily changing an air/fuel ratio of the exhaust gas into a rich range to deoxidize and remove absorbed NOx, which is absorbed by an NOx storage and reduction catalyst of an NOx catalytic converter. The ECU changes a degree of richness of the air/fuel ratio at a time of performing the rich purge based on a state of the NOx catalytic converter.

REFERENCES:
patent: 5483795 (1996-01-01), Katoh et al.
patent: 2001/0032456 (2001-10-01), Yonekura et al.
patent: 199 15 793 (2000-10-01), None
patent: 11-343833 (1999-12-01), None
patent: 2005-113921 (2005-04-01), None
Japanese Office Action dated Apr. 27, 2010, issued in corresponding Japanese Application No. 2005-372159, with English translation.
German Office Action dated Oct. 21, 2009, issued in corresponding German Application No. 10 2006 035 311.0-13, with English translation.

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