Exhaust purification system for internal combustion engine

Details Exhaust purification system for internal combustion engine Exhaust purification system for internal combustion engine

2005-10-14

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...

C060S276000, C060S287000, C060S288000, C060S295000, C060S301000, C060S303000

Reexamination Certificate

active

07832199

ABSTRACT:
Art is provided for an exhaust purification system for an internal combustion engine, which decreases an amount of exhaust flowing to a storage-reduction type NOx catalyst and supplies a reducer to the NOx catalyst so as to reduce NOx stored in the NOx catalyst, wherein the manner in which the reducer is dispersed in the NOx catalyst can be controlled to achieve more reliable execution of a NOx reduction treatment. Air-fuel ratio detecting unit is disposed upstream and downstream of the storage-reduction type NOx catalyst. During a predetermined period subsequent to decreasing an amount of exhaust flowing to the NOx catalyst and adding the reducer to the exhaust, a reducer-adding timing is changed such that a difference between an air-fuel ratio detected by the air-fuel ratio detecting unit disposed upstream of the NOx catalyst and an air-fuel ratio detected by the air-fuel ratio detecting unit disposed downstream of the NOx catalyst becomes a predetermined target value.

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Extended European Search Report issued in EP Application No. 05795135.2 on Apr. 29, 2010.

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