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

1989-04-11

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Fuel injection system

123489, F02D 4122

Patent

active

048196029

ABSTRACT:
A system of abnormality detection for 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, 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 oxygen pump element, on the basis of a level of the sensed pump current together with an air/fuel ratio compensation value which is derived from a sensed oxygen concentration level.

REFERENCES:
patent: 4502443 (1985-03-01), Hasegawa et al.

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