Engine exhaust gas control system having NOx catalyst

Details Engine exhaust gas control system having NOx catalyst Engine exhaust gas control system having NOx catalyst

1998-10-06

2000-11-21

Chapman, Jeanette

Power plants

Internal combustion engine with treatment or handling of...

Having sensor or indicator of malfunction, unsafeness, or...

60274, 60276, 60285, 60286, 60297, 60301, 60303, F01N 300, F01N 700

Patent

active

061486124

ABSTRACT:
In an engine exhaust system, an NOx catalyst for occluding NOx in a state of the lean air-fuel ratio and reducing the occluded NOx in the state of the rich air-fuel ratio. A CPU sets a target air-fuel ratio of a mixture supplied to an engine to the lean side with respect to the stoichiometric air-fuel ratio for the lean mixture combustion. The CPU sets a rich time for a rich mixture combustion in accordance with the engine operating state and the NOx purification rate in the NOx catalyst. In this moment, the shortest rich time is set within a range in which a desired NOx purification rate by the NOx catalyst is obtained. A three-way catalyst may be arranged upstream of the NOx catalyst. The three-way catalyst carries only a noble metal such as platinum having no oxygen storing capability.

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