Oxygen concentration sensor trouble discriminating apparatus

Details Oxygen concentration sensor trouble discriminating apparatus Oxygen concentration sensor trouble discriminating apparatus

1999-06-02

2000-10-24

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

731181, F02D 4122, F02D 4114

Patent

active

061351016

ABSTRACT:
An oxygen concentration sensor trouble discriminating apparatus in which a counter executes a counting operation every time a lean state of an air-fuel ratio is detected on the basis of an output signal of an oxygen concentration sensor for the first time after a feedback control operating state was not detected. In the case where the air-fuel ratio feedback control operating state is detected, if the output signal of the oxygen concentration sensor indicates an inversion of the rich and lean states of the air-fuel ratio, a count value of the counter is reset to an initial value. When the count value is larger than a predetermined value, the oxygen concentration sensor is decided to be in trouble.

REFERENCES:
patent: 4980834 (1990-12-01), Ikeda et al.
patent: 5423203 (1995-06-01), Namiki et al.

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