Apparatus for detecting reduction of purifying capacity of catal

Details Apparatus for detecting reduction of purifying capacity of catal Apparatus for detecting reduction of purifying capacity of catal

1995-09-28

1998-04-28

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

057430829

ABSTRACT:
A detecting apparatus for a catalytic converter has a pair of O.sub.2 sensors, arranged individually on the up- and downstream sides of the converter, and an electronic control unit for discriminating reduction of the purifying capacity of a three-way catalyst in the converter. This unit discriminates the reduction of the purifying capacity in accordance with the comparison between a decision value and the ratio between the respective frequencies of outputs from the O.sub.2 sensors. In the case where the O.sub.2 sensor on the upstream side is subject to thermal degradation, its decision value is corrected, or the decision itself is interrupted.

REFERENCES:
patent: Re33942 (1992-06-01), Katsuno et al.
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5097700 (1992-03-01), Nakane
patent: 5311737 (1994-05-01), Komatsu
patent: 5337555 (1994-08-01), Tokuda
patent: 5337558 (1994-08-01), Komatsu
patent: 5396765 (1995-03-01), Maruyama
patent: 5533332 (1996-07-01), Uchikawa

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