Device for judging the deterioration of a catalyst of an engine

Details Device for judging the deterioration of a catalyst of an engine Device for judging the deterioration of a catalyst of an engine

1996-10-30

1998-04-07

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320, F02D 4114

Patent

active

057351201

ABSTRACT:
A device for judging the deterioration of a three-way catalyst comprising an upstream O.sub.2 sensor and a downstream O.sub.2 sensor which are arranged in the exhaust passage upstream and downstream of the three-way catalyst, respectively. The deterioration of the three-way catalyst is judged in a predetermined narrow operating region based on the output of these O.sub.2 sensors. A learning value is set for control of the air-fuel ratio for the predetermined narrow operating region separate from the other operating regions.

REFERENCES:
patent: 5279116 (1994-01-01), Shimizu et al.
patent: 5280707 (1994-01-01), Nakashima et al.
patent: 5301501 (1994-04-01), Shimizu et al.
patent: 5359853 (1994-11-01), Shimizu
patent: 5377484 (1995-01-01), Shimizu
patent: 5412941 (1995-05-01), Suzuki et al.
patent: 5595061 (1997-01-01), Toyoda

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