Catalytic converter deterioration detecting system for engine

Details Catalytic converter deterioration detecting system for engine Catalytic converter deterioration detecting system for engine

1993-08-26

1995-05-09

Yeung, James C.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123703, F01N 320

Patent

active

054129427

ABSTRACT:
A catalytic converter deterioration detecting system for an engine derives a low-frequency component in an output of a downstream-side oxygen sensor provided downstream of a catalytic converter. The system detects deterioration of the catalytic converter based on the low-frequency component, such as, an amplitude of the low-frequency component or a period of the low-frequency component. For higher detection accuracy, an amplitude of a high-frequency component in the output of the downstream-side oxygen sensor is additionally used for detecting deterioration of the catalytic converter. Specifically, the system determines that the catalytic converter is deteriorated when the low-frequency amplitude is smaller than a given value and the high-frequency amplitude is greater than a given value.

REFERENCES:
patent: 4135381 (1979-01-01), Sherwin
patent: 4463594 (1984-08-01), Raff et al.
patent: 5115639 (1992-05-01), Gopp
patent: 5172549 (1992-12-01), Kako

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