Failure-detecting device for air-fuel ratio sensors of internal

Details Failure-detecting device for air-fuel ratio sensors of internal Failure-detecting device for air-fuel ratio sensors of internal

1992-03-06

1993-05-25

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 123688, 731181, F01N 320

Patent

active

052129470

ABSTRACT:
A failure-detecting device detects failure of an air-fuel ratio sensor arranged downstream of a three-way catalyst in an exhaust passage of an internal combustion engine. The air-fuel ratio of an air-fuel mixture supplied to the engine is perturbed with a predetermined repetition period and by a predetermined amplitude. There is detected an amount of change in an output from the air-fuel ratio sensor responsive to the perturbed air-fuel ratio. Failure of the air-fuel ratio sensor is detected based on the amount of change in the output from the air-fuel ratio sensor.

REFERENCES:
patent: 4024706 (1977-05-01), Adawi
patent: 4724814 (1988-02-01), Mieno
patent: 4739614 (1988-04-01), Katsuno
patent: 4844038 (1989-07-01), Yamato

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