Air-fuel ratio control system for internal combustion engines

Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means

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Details

731181, F02B 7708, F02D 3300, G05B 2302

Patent

active

055267980

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine comprises an exhaust gas component concentration sensor arranged in the exhaust system of the engine, for detecting concentration of oxygen present in exhaust gases emitted from the engine, and an ECU which controls the air-fuel ratio of an air-fuel mixture to be supplied to the engine, based on the difference between an output value from the exhaust gas component concentration sensor and a predetermined reference value, and detects deterioration of the exhaust gas component concentration sensor, based on the output value from the exhaust gas component concentration sensor. When the deterioration of the exhaust gas component concentration sensor is detected, a deterioration display signal is outputted, while whether execution of air-fuel ratio control is to be inhibited or to be continued is determined based on the deterioration degree of the exhaust gas component concentration sensor.

REFERENCES:
patent: 4121548 (1978-10-01), Hattori et al.
patent: 4149408 (1979-04-01), Ezoe et al.
patent: 5379635 (1995-01-01), Gee et al.

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