Method and apparatus for controlling air-fuel ratio in internal

Details Method and apparatus for controlling air-fuel ratio in internal Method and apparatus for controlling air-fuel ratio in internal

1991-05-31

1993-01-19

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123688, F02D 4114

Patent

active

051799243

ABSTRACT:
In an air-fuel ratio control method and apparatus for an internal combustion engine supplied with a gas mixture of air and fuel, in which an actual air-fuel ratio is determined from exhaust gas components by using an O.sub.2 -sensor installed in an exhaust pipe of the engine, and the air-fuel ratio of the mixture gas to be supplied to the engine is controlled through feedback control on the basis of deviation of the actually detected air-fuel ratio from a reference value (A/F=14.7). Performance of the O.sub.2 -sensor is determined by making use of change in the air-fuel ratio output of the O.sub.2 -sensor at a time of interruption of the fuel supply to the engine or at a time the fuel supply to the engine is restarted.

REFERENCES:
patent: 4177787 (1979-12-01), Hattori et al.
patent: 4844038 (1989-07-01), Yamato et al.
patent: 4887576 (1989-12-01), Inamoto et al.

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