Exhaust aftertreatment system

Details Exhaust aftertreatment system Exhaust aftertreatment system

2006-05-30

2006-05-30

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...

C060S286000, C060S287000, C060S295000, C060S301000, C060S324000, C422S170000, C422S182000

Reexamination Certificate

active

07051521

ABSTRACT:
A particulate filter integrally carrying an oxidation catalyst is arranged in an exhaust pipe through which exhaust gas from a diesel engine flows. A NOx-absorption reduction catalyst is arranged in the exhaust pipe and downstream of the particulate filter. A bypass line is branched from a portion of the exhaust pipe between the particulate filter and the reduction catalyst and is connected to a portion of the exhaust pipe downstream of the reduction catalyst. A selector valve is arranged at the branch point of the bypass line and may be switched over to guide the exhaust gas either to the reduction catalyst or to the bypass line. As a result, without difficultly controlling the operation of the diesel engine, the reduction catalyst is prevented from being poisoned and deteriorated by sulfate, the lowering of the ratio of NOxpurification through the NOx-absorption reduction catalyst is averted and prolongation of its life is attained.

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