Air-fuel ratio control system

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

1985-10-15

1987-06-09

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, F02M 700

Patent

active

046712380

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 pulse generating circuit for generating pulses, the duty ratio of which is dependent on the oxygen concentration. The system has an engine deceleration detecting circuit and a light load detecting circuit for producing a deciding signal. Pulses having a fixed duty ratio are applied to the electromagnetic valve in response to the deciding signal so as to enrich the air-fuel mixture at the deceleration when the throttle valve closes.

REFERENCES:
patent: 3939654 (1976-02-01), Creps
patent: 4027477 (1977-06-01), Storey
patent: 4036186 (1977-07-01), Hattori et al.
patent: 4046118 (1977-09-01), Aono
patent: 4089313 (1978-05-01), Asano et al.
patent: 4131091 (1978-12-01), Asano et al.
patent: 4240389 (1980-12-01), Shimazaki
patent: 4363305 (1982-12-01), Ohgami et al.
patent: 4539967 (1985-09-01), Nakajima et al.
patent: 4563990 (1986-01-01), Kishida et al.

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