Air-fuel ratio control system

Details Air-fuel ratio control system Air-fuel ratio control system

1985-10-15

1986-09-23

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, 123339, 123489, F02M 5100

Patent

active

046128921

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine has an electromagnetic valve for correcting the air-fuel ratio of air-fuel mixture, an O.sub.2 sensor for detecting oxygen concentration in exhaust gases, and a feedback control circuit including a PI circuit for producing a PI value, and a pulse generating circuit responsive to the PI value for generating pulses duty ratio of which is dependent on the PI value. The PI value is corrected to a PI value operative to rapidly changing the duty ratio of the pulses so as to enrich the air-fuel mixture, ar rapid deceleration of the engine.

REFERENCES:
patent: 4344400 (1982-08-01), Asano
patent: 4364358 (1982-12-01), Shikata et al.
patent: 4398517 (1983-08-01), Kubota et al.
patent: 4475512 (1984-10-01), Suzuki et al.
patent: 4479464 (1984-10-01), Kondo et al.
patent: 4483296 (1984-11-01), Kataoka
patent: 4512313 (1985-04-01), Tsuchida et al.

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