Method of abnormality detection of oxygen concentration sensor

Details Method of abnormality detection of oxygen concentration sensor Method of abnormality detection of oxygen concentration sensor

1987-03-27

1988-10-18

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 204406, F02D 4114, F02D 4122

Patent

active

047779225

ABSTRACT:
Abnormalities are detected in an oxygen concentration sensor employed to sense the oxygen concentration in engine exhaust gas for obtaining data to control the air/fuel ratio of a fuel mixture supplied to the engine, in which the oxygen concentration sensor includes a sensor cell element and an oxygen pump element. The method functions to detect an abnormality of the oxygen concentration sensor on the basis of the value of sensor voltage which is developed by the sensor cell element and at least one of a set of parameters consisting of an engine operating condition, the value of pump current which flows between the electrodes of the oxygen pump element, and an air/fuel ratio compensation value which is derived from a sensed oxygen concentration level.

REFERENCES:
patent: 3938075 (1976-02-01), Reddy
patent: 3948228 (1976-04-01), Luchaco
patent: 4502443 (1985-03-01), Hasegawa et al.
patent: 4615787 (1986-10-01), Yamada et al.

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