Device for judging deterioration of catalyst of engine

Details Device for judging deterioration of catalyst of engine Device for judging deterioration of catalyst of engine

1996-10-21

1998-04-28

Argenbright, Tony M.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 320, F02D 4114

Patent

active

057430861

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. When the ratio of length of the output signal response curve of the downstream O.sub.2 sensor and the length of the output signal response curve of the upstream O.sub.2 sensor is over a threshold level, it is judged that the three-way catalyst has deteriorated. The threshold value is reduced as the mean value of the air-fuel ratio becomes off from the stoichiometric air-fuel ratio.

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