Exhaust gas deNOx apparatus for engine

Power plants – Internal combustion engine with treatment or handling of... – By means producing a chemical reaction of a component of the...

Reexamination Certificate

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Details

C060S278000, C060S280000, C060S295000, C123S568200

Reexamination Certificate

active

06901746

ABSTRACT:
An exhaust gas deNOx apparatus, which can make an NOx adsorber catalyst compact and does not impair reliability of an engine, is provided. To this end, the apparatus is provided with an NOx adsorber catalyst for adsorbing and releasing NOx, an exhaust gas recirculating circuit for mixing an exhaust gas into intake air, and an exhaust gas recirculating circuit adjusting valve and controller for recirculating a predetermined amount of the exhaust gas for reducing NOx when the adsorbed NOx accumulation amount is a predetermined value or less, and recirculating the aforementioned predetermined amount or more of exhaust gas to bring an air fuel ratio into a rich state when the adsorbed NOx accumulation amount exceeds a predetermined value and is to be released.

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