Power plants – Internal combustion engine with treatment or handling of... – Material from exhaust structure fed to engine intake
Reexamination Certificate
2003-02-10
2008-11-11
Nguyen, Tu M. (Department: 3748)
Power plants
Internal combustion engine with treatment or handling of...
Material from exhaust structure fed to engine intake
C060S274000, C060S285000, C060S300000, C060S295000
Reexamination Certificate
active
07448203
ABSTRACT:
An exhaust gas decontamination system and a method of exhaust gas decontamination wherein in the regeneration of NOxocclusion reduction type catalyst with respect to a lean-burn engine or diesel engine, even in the instance of rich burning accompanied by EGR the NOxreleased from the NOxocclusion reduction type catalyst can satisfactorily be reduced and purged to thereby exhibit a high NOxremoval ratio. The exhaust gas decontamination system (1) provided with the NOxocclusion reduction type catalyst (30) includes a control unit (C1) comprising a.norrnal control operation feature (C10), a regeneration control initiation judging feature (C20), a catalyst activation control-operation feature (C30) and a rich-burn control operation feature (C40) capable of lowering the concentration of oxygen in the exhaust gas so as to realize such a constitution that the catalyst is carried out just before rich burning accompanied by EGR.
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Gabe Masashi
Nagaoka Daiji
Isuzu Motors Limited
Nguyen Tu M.
Staas & Halsey , LLP
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