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
F02M 724
Patent
active
043752110
ABSTRACT:
A system for controlling air-fuel ratio for an internal combustion engine having a two-barrel carburetor. An electronic controller compares the output signal of an O.sub.2 sensor with a reference corresponding to stoichiometry and for operating on-off electromagnetic valve(s) 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 to the electronic controller. An engine operation detector is provided for detecting the transition from a heavy load condition to light load condition for producing a signal. 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 O.sub.2 sensor. A switch actuating circuit is provided to actuate the switch by the output signal of the engine operation detector for a predetermined period. Thus, the on-off electromagnetic valve is operated at a small duty ratio after the heavy load condition for a predetermined period.
REFERENCES:
patent: 4089313 (1978-05-01), Asano et al.
patent: 4096834 (1978-06-01), Norimatsu et al.
patent: 4132199 (1979-01-01), Kuroiwa et al.
patent: 4187812 (1980-02-01), Hosaka et al.
Ohara Yoshiaki
Shikata Makoto
Dolinar Andrew M.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Myhre Charles J.
Nissan Motor Co,. Ltd.
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