Apparatus and method for determining catalyst degradation

Details Apparatus and method for determining catalyst degradation Apparatus and method for determining catalyst degradation

2006-05-12

2011-12-13

Nguyen, Tu (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

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

C060S276000, C060S285000

Reexamination Certificate

active

08074441

ABSTRACT:
A target air-fuel ratio of exhaust gas is changed back and forth between rich and lean in short periods, and it is determined that the catalyst is degraded when the air-fuel ratio of exhaust gas is lean by the time a predetermined period of time has passed from the time the target air-fuel ratio started to be changed.

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