System for detecting deterioration of exhaust gas purifying cata

Details System for detecting deterioration of exhaust gas purifying cata System for detecting deterioration of exhaust gas purifying cata

1997-07-07

1999-11-09

Denion, Thomas E.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, F01N 300

Patent

active

059791608

ABSTRACT:
A diagnosis of deterioration and/or normality of an exhaust gas purifying catalyst is made by comparing a ratio of reversal frequencies of outputs from oxygen sensors disposed on opposite sides of the exhaust gas purifying catalyst with a threshold ratio. Discrimination is performed on both normality and deterioration in a standard gas quantity zone, on only normality in a large gas quantity zone, and on only deterioration in a small gas quantity zone, and nothing is made in an extra large gas quantity zone.

REFERENCES:
patent: 5228287 (1993-07-01), Kurowishi et al.
patent: 5233829 (1993-08-01), Komatsu
patent: 5724809 (1998-03-01), Mitsutani et al.

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