Method of detecting deterioration of a three-way catalyst of an

Details Method of detecting deterioration of a three-way catalyst of an Method of detecting deterioration of a three-way catalyst of an

1994-02-01

1995-05-16

Teska, Kevin J.

Boots, shoes, and leggings

60274, 60276, 60285, 36443101, 36443104, 36443103, G06F 1548

Patent

active

054167108

ABSTRACT:
A method of detecting deterioration of a three-way catalyst of an internal combustion engine comprises the steps of (1) obtaining a first signal and a second signal based on respective signals outputted from a pre-catalyst O.sub.2 sensor and a post-catalyst O.sub.2 sensor at least one of when the fuel supply to the engine is increased and when the fuel supply to the engine is interrupted, (2) comparing a waveform of a signal outputted from the pre-catalyst O.sub.2 sensor with a waveform of a signal outputted from the post-catalyst O.sub.2 sensor, based on the first and second signals while the engine is in a predetermined stable operating condition, and (3) determining from results of the comparison whether or not the three-way catalyst is deteriorated.

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