Air-fuel ratio control system

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

1985-10-15

1987-03-24

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123440, 123489, 123492, 123493, F02M 4100, F02M 7100

Patent

active

046516956

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, and a pulse generating circuit responsive to the output of the PI circuit for generating pulses, the duty ratio of which is dependent on the output of the PI circuit. A steady state detecting circuit is provided for producing a steady state signal when the magnitude of acceleration of the engine is within a predetermined range. The constant of the PI circuit is decreased by the steady state signal for preventing overshooting of the air-fuel ratio control.

REFERENCES:
patent: 3831564 (1974-08-01), Schmidt et al.
patent: 4029061 (1977-06-01), Asano
patent: 4046118 (1977-09-01), Aono
patent: 4057042 (1977-11-01), Aono
patent: 4089313 (1978-05-01), Asano et al.
patent: 4361124 (1982-11-01), Nakamura
patent: 4416236 (1983-11-01), Morozumi et al.
patent: 4465048 (1984-08-01), Morozumi et al.

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