Catalyst deterioration judgment device

Details Catalyst deterioration judgment device Catalyst deterioration judgment device

2008-03-13

2011-10-11

McCall, Eric S (Department: 2855)

Measuring and testing

Internal combustion engine or related engine system or...

Exhaust system

Reexamination Certificate

active

08033168

ABSTRACT:
A catalyst deterioration judgment device that can accurately perform a catalyst deterioration judgment by considering an oxygen density at downstream of an exhaust purification catalyst. The system reads outputs of an oxygen sensor and an ammonia sensor that are installed in downstream of an NSR catalyst when the catalyst is in an activate condition. When this read oxygen sensor output is equal to or more than a reference value and the ammonia sensor output is equal to or more than a reference value, it is estimated that ammonia oxidizing reaction does not occur under existence of oxygen in the NSR catalyst. In this case, the NSR catalyst is judged to be deteriorated.

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