Diagnosing device and diagnosing method in air/fuel ratio contro

Details Diagnosing device and diagnosing method in air/fuel ratio contro Diagnosing device and diagnosing method in air/fuel ratio contro

1992-11-05

1993-08-17

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

F02D 4114

Patent

active

052359573

ABSTRACT:
In a device for feedback control of an air/fuel ratio using an oxygen sensor for detecting oxygen concentration in exhaust gas, two different reference levels for diagnosis are set according to a detection signal level of the above oxygen sensor. And a response time with which the detection signal of the oxygen sensor crosses the above reference levels for diagnosis is measured so as to diagnose deterioration of the oxygen sensor based on comparison between the above measured response time and a predetermined response time.

REFERENCES:
patent: 4208993 (1980-06-01), Peter
patent: 4512313 (1985-04-01), Tsuchida et al.
patent: 4638658 (1987-01-01), Otobe
patent: 4844038 (1989-07-01), Yamato et al.

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