Exhaust purification apparatus of internal combustion engine...

Details Exhaust purification apparatus of internal combustion engine... Exhaust purification apparatus of internal combustion engine...

2011-07-12

2011-07-12

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...

C060S285000, C060S276000, C060S295000

Reexamination Certificate

active

07975471

ABSTRACT:
An engine has a first cylinder group and a second cylinder group. The first cylinder group and the second cylinder group are connected to a common NOx storage reduction catalyst via their corresponding exhaust passageways and their corresponding three-way catalysts, respectively. When the temperature of the NOx storage reduction catalyst is to be raised, the average air-fuel ratio of the first cylinder group is made rich, and the average air-fuel ration of the second cylinder group is made lean. At this time, in the first cylinder group, the air-fuel of two cylinders is made rich and the air-fuel ration of one cylinder is made lean, and in the second cylinder group, the air-fuel ratio of two cylinders is made lean and the air-fuel ratio of one cylinder is made rich, in accordance with an embodiment.

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