Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1980-12-30
1983-03-01
Myhre, Charles J.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123492, F02M 702
Patent
active
043752101
ABSTRACT:
A system for controlling air-fuel ratio for a carburetor for an internal combustion engine having an induction passage, a throttle valve, an exhaust passage, a detector such as an oxygen sensor for detecting the concentration of oxygen in the exhaust gases, air-fuel mixture supply unit, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the air-fuel mixture supply unit and electronic controller. The electronic controller comprises a comparator for comparing the output signal of the detector with a set value, an integrating circuit connected to the comparator, a triangular wave pulse generator, and a driving circuit for producing square wave pulses for driving the on-off electromagnetic valve(s) for output signals of the integrating circuit and of the triangular wave pulse generator for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A constant signal generating circuit is selectively connected operatively to the electronic controller. An engine operation detector for detecting a wide open condition of the throttle valve produces a signal during the wide open condition. A switching circuit operatively connects the constant signal generating circuit to the electronic controller for providing a fixed duty ratio of the valve, and renders the electronic controller non-responsive to the output of the exhaust gas detector. The switching circuit is adapted to be operated by the signal of the engine operation detector. A delay circuit is provided to delay the operation of the switching circuit. Thus, the on-off electromagnetic valve is operated at a fixed duty ratio after the wide open condition continues a predetermined period.
REFERENCES:
patent: 4119072 (1978-10-01), Asano
patent: 4131091 (1978-12-01), Asano et al.
patent: 4143623 (1979-03-01), Norimatsu et al.
patent: 4167924 (1979-09-01), Carlson et al.
Ohara Yoshiaki
Ohgami Masaaki
Dolinar Andrew M.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Myhre Charles J.
Nissan Motor Co,. Ltd.
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