Abnormality detecting method for exhaust gas concentration senso

Internal-combustion engines – Charge forming device – Fuel injection system


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A method of detecting abnormality in an exhaust gas concentration sensor in an internal combustion engine equipped with a fuel supply control system which controls a quantity of fuel to be supplied to the engine in a feedback manner responsive to a value of an air-fuel ratio correction value set in response to an output signal from the sensor. The sensor output signal is monitored from the time a first predetermined period of time has elongated from the start of the engine. The sensor is diagnosed as abnormal if the output signal has continually maintained a substantially constant value over a second predetermined time period elapsed following the first predetermined time period. The first predetermined time period corresponds to a time lag in rise of the output signal. The second predetermined time period is set such that the sum of the first and second preetermined time periods is shorter than a period of time within which the sensor becomes completely activated after the start of the engine.

patent: 4359030 (1982-11-01), Sone et al.
patent: 4485786 (1984-12-01), Kashimura
patent: 4502443 (1985-03-01), Hasegawa et al.


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