Exhaust gas purifying apparatus of internal combustion engine

Details Exhaust gas purifying apparatus of internal combustion engine Exhaust gas purifying apparatus of internal combustion engine

2006-10-31

2006-10-31

Nguyen, Tu M. (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, C060S297000

Reexamination Certificate

active

07127883

ABSTRACT:
An exhaust gas purifying apparatus of an internal combustion engine is provided which includes: exhaust gas purifying means, provided in an exhaust passage of the engine, for adsorbing NOxin an exhaust gas when the air-fuel ratio of the exhaust gas is lean. The exhaust gas apparatus releases or reduces the adsorbed NOxwhen the oxygen concentration of the exhaust gas is reduced. A light-off catalyst is provided upstream of the exhaust gas purifying apparatus in the exhaust passage, which has a lower O2storage capability than the exhaust gas purifying apparatus. There is a control device for controlling the air-fuel ratio of the exhaust gas so that an atmosphere having a reduced oxygen concentration is produced around the exhaust gas purifying apparatus when the NOxconversion efficiency of the exhaust gas purifying apparatus is decreased.

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