System of abnormality detection for oxygen concentration sensor

Details System of abnormality detection for oxygen concentration sensor System of abnormality detection for oxygen concentration sensor

1987-03-27

1988-02-16

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, 204406, F02D 4114

Patent

active

047248149

ABSTRACT:
A system of abnormality detection for an oxygen concentration sensor employed to sense the oxygen concentration in engine exhaust gas, and to obtain data to control the air/fuel ratio of a fuel mixture supplied to the engine. The oxygen concentration sensor including a sensor cell element and an oxygen pump element. The system serves to detect an abnormality such as an open-circuit or a short-circuit in electrode connecting leads of the sensor cell element on the basis of a value of voltage developed between the electrodes of the sensor cell element and of a value of current which flows between the electrodes of the oxygen pump element.

REFERENCES:
patent: 4202301 (1980-05-01), Early et al.
patent: 4502443 (1985-03-01), Hasegawa et al.

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