Method of detecting deterioration of an exhaust gas concentratio

Details Method of detecting deterioration of an exhaust gas concentratio Method of detecting deterioration of an exhaust gas concentratio

1990-06-11

1991-10-01

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

73 2332, 731182, F02D 4114

Patent

active

050523619

ABSTRACT:
Deterioration of an exhaust gas concentration sensor for an internal combustion engine is detected by integrating a difference between an output from the exhaust gas concentration sensor and a predetermined reference value which is outside a range of the output which can be assumed during normal operation of the exhaust gas concentration sensor, comparing a thus obtained integral value with a predetermined deterioration-determining value, and determining from the result of the comparision whether the exhaust gas concentration sensor is deteriorated.

REFERENCES:
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patent: 4177787 (1979-12-01), Hattori et al.
patent: 4414950 (1983-11-01), Otsuka et al.
patent: 4624232 (1986-11-01), Saito et al.
patent: 4729219 (1988-03-01), Kayanuma et al.
patent: 4844038 (1989-07-01), Yamato et al.
patent: 4938194 (1990-07-01), Kato et al.

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