Exhaust gas purification device for internal combustion engine

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

2007-07-11

2010-11-16

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...

C060S277000, C060S285000, C060S286000, C060S301000, C060S303000

Reexamination Certificate

active

07832202

ABSTRACT:
An exhaust gas purification device senses an air-fuel ratio of exhaust gas flowing into a catalyst and performs rich purge control for supplying fuel for reduction to the catalyst. The device calculates a total reducing agent amount consumed for the reduction during the rich purge control based on the air-fuel ratio and a fresh air amount as of the rich purge control. The device sets a specified air-fuel ratio state for controlling the air-fuel ratio in a certain range enabling more precise measurement of the air-fuel ratio than in the rich purge control. The device corrects the total reducing agent amount based on a difference between an injection amount command value as of the rich purge control and the injection amount command value in the specified air-fuel ratio state and the air-fuel ratio sensed in the specified air-fuel ratio state.

REFERENCES:
patent: 6244046 (2001-06-01), Yamashita
patent: 2002/0023432 (2002-02-01), Ishizuka et al.
patent: 2004/0163381 (2004-08-01), Shirakawa et al.
patent: 2000-34946 (2001-08-01), None

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