Catalyst deterioration-determining system for internal combustio

Details Catalyst deterioration-determining system for internal combustio Catalyst deterioration-determining system for internal combustio

1995-11-15

1997-06-10

Kwon, John T.

Power plants

Internal combustion engine with treatment or handling of...

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

F01N 300

Patent

active

056365144

ABSTRACT:
A catalyst deterioration-detecting system for an internal combustion engine detects deterioration of a catalyst arranged in an exhaust passage of the engine based on the output from an oxygen concentration sensor arranged in the exhaust passage at a location downstream of the catalyst, during execution of air-fuel ratio control. The detection of deterioration of the catalyst is effected based on a value of a catalyst deterioration parameter indicative of a degree of deterioration of the catalyst, and an amount of variation in an air-fuel ratio control amount used in the air-fuel ratio control.

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patent: 5448886 (1995-09-01), Toyoda
patent: 5542248 (1996-08-01), Iwata et al.

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