System for controlling air-fuel ratio

Details System for controlling air-fuel ratio System for controlling air-fuel ratio

1980-08-01

1982-12-28

Lall, P. S.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, 123493, F02M 700

Patent

active

043656030

ABSTRACT:
A system for controlling air-fuel ratio for a carburetor for an internal combustion engine having an intake passage, on air-fuel mixture supply device, a throttle valve, an exhaust passage, a detector such as an oxygen sensor for detecting the concentration of oxygen in the exhaust gases, an on-off type electromagnetic valve for correcting the air-fuel mixture and an electronic controller.
The electronic controller comprises a comparing circuit for comparing the output signal of the detector with a reference, a proportional and integration circuit for producing a control signal connected to the comparing circuit, a triangular wave pulse generator, and a driving circuit for producing square wave pulses for driving the on-off type electromagnetic valve from the control signals of the proportional and integration circuit and of the triangular wave pulse, generator for controlling the air-fuel ratio to a valve approximately equal to the stoichiometric air-fuel ratio. A holding circuit for memorizing a voltage corresponding to the control signal during an idling operation connectable to the electronic controller. The holding circuit comprises a capacitor for, being charged with the voltage corresponding to control signal and an operational amplifier operated by the voltage charged in the capacitor. A first switch for connecting the capacitor to the electric controller, for charging the capacitor, a second switch for operative connection and disconnection, respectively, of the detector from the electronic controller circuit, and a third switch for connecting during a rapid deceleration that could cause misfiring the output of the amplifier to the electronic controller are provided.

REFERENCES:
patent: 4089313 (1978-05-01), Asano et al.
patent: 4096834 (1978-06-01), Norimatsu et al.
patent: 4103649 (1978-08-01), Matumoto et al.
patent: 4121554 (1978-10-01), Sueishi et al.
patent: 4123999 (1978-11-01), Asano
patent: 4173952 (1979-11-01), Asano
patent: 4187812 (1980-02-01), Hosaka et al.
patent: 4279230 (1981-07-01), Baur et al.

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