Diagnosis system of exhaust aftertreatment apparatus for...

Details Diagnosis system of exhaust aftertreatment apparatus for... Diagnosis system of exhaust aftertreatment apparatus for...

2007-01-16

2007-01-16

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S295000

Reexamination Certificate

active

10814602

ABSTRACT:
A diagnosis system of an exhaust aftertreatment apparatus for an internal combustion engine is arranged to execute a first deterioration diagnosis of the exhaust aftertreatment apparatus on the basis of a change of a catalyst downstream side air/fuel ratio relative to a change of a catalyst upstream side air/fuel ratio during a rich spike control and to execute a second deterioration diagnosis from an inversion cycle of a feedback quantity during the feedback control of the catalyst downstream side air/fuel ratio during a stoichiometric control when the first deterioration diagnosis made a deterioration determination.

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