Air-fuel ratio control system

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

1981-12-21

1984-08-14

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123438, F02M 724

Patent

active

044650485

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine comprises an induction passage, a carburetor, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied to the carburetor, an O.sub.2 -sensor for detecting oxygen concentration of exhaust gases, and a feedback control circuit responsive to the output of the O.sub.2 -sensor for producing pulses for driving said electromagnetic valve for correcting the air-fuel ratio.
An engine speed detecting circuit is provided for producing an output signal which varies with the engine speed; and a frequency changing circuit is provided to be responsive to the output signal of the engine speed detecting for changing the frequency of the pulses whereby the electromagnetic valve may be prevented from resonating with the vibration of the engine and with the pulsations of induced air.

REFERENCES:
patent: 3931814 (1976-01-01), Rivere
patent: 4048479 (1977-09-01), Rivere
patent: 4363305 (1982-12-01), Ohgami et al.

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