Method for detecting catalyst malfunctions

Details Method for detecting catalyst malfunctions Method for detecting catalyst malfunctions

1993-04-07

1994-05-24

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 320

Patent

active

053137914

ABSTRACT:
A method of detecting catalyst malfunction in a vehicle uses an exhaust gas oxygen sensor downstream of the catalyst. A feedback loop controls the air-fuel ratio as a function of the output signal from the exhaust gas oxygen sensor. The feedback gain is increased from low gain to high gain and then operational parameters are examined. In a first version the amplitude of the exhaust gas oxygen sensor is used as an indication. In a second version, the amplitude of the exhaust gas oxygen sensor reaches a predetermined limit and then the feedback gain is examined. In a third version, limit-cycle operation is reached and the frequency of the limit-cycle is examined with respect to a predetermined frequency.

REFERENCES:
patent: 4029061 (1977-06-01), Asano
patent: 5025624 (1991-06-01), Strauss
patent: 5083427 (1992-01-01), Anderson

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