Air-fuel ratio control system

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

1981-07-07

1983-06-21

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Having fluidic logic control means

123489, F02M 720

Patent

active

043889050

ABSTRACT:
A system for controlling the air-fuel ratio for a carburetor for an internal combustion engine having an intake passage, an exhaust passage, a throttle valve, a detector for detecting the concentration of a constituent of the exhaust gases, an on-off type electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by an air-fuel mixture supplier and an electronic controller. The electronic controller comprises a judging circuit for comparing the output signal of the detector with a stoichiometric reference signal, for driving the on-off electromagnetic valve for controlling the air-fuel ratio to a value approximating the stoichiometric air-fuel ratio. A load sensor and an engine temperature sensor are provided respectively. A correcting circuit renders the electronic controller non-responsive to the detector, when the engine temperature sensor actuates in the cold engine operation and responsive to the output of the load sensor, whereby the on-off electromagnetic valve operates in accordance with the output of the sensor.

REFERENCES:
patent: 4144847 (1979-03-01), Hosaka
patent: 4187812 (1980-02-01), Hosaka et al.
patent: 4240389 (1980-12-01), Shimazaki

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