Diagnosis device of exhaust purification catalyst

Details Diagnosis device of exhaust purification catalyst Diagnosis device of exhaust purification catalyst

2011-02-15

2011-02-15

Tran, Binh Q. (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S286000, C060S297000, C060S301000, C060S303000

Reexamination Certificate

active

07886521

ABSTRACT:
An exhaust purification catalyst diagnosis device for diagnosing a degree of performance degradation of a NOx catalyst, which is provided in an exhaust system of an engine for exhaust purification, has a program that determines whether temperature of the NOx catalyst is within a predetermined diagnosis permission range before catalyst diagnosis processing and a program that controls the temperature of the NOx catalyst into the diagnosis permission range before the catalyst diagnosis processing if it is determined that the temperature of the NOx catalyst is outside the diagnosis permission range. Thus, the exhaust purification catalyst diagnosis device can perform the catalyst diagnosis processing frequently with high reliability and high accuracy, while maintaining suitable emission.

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Japanese Office Action dated Nov. 24, 2010 issued in corresponding Japanese Application No. 2006-285694 with English Translation.

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