Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1982-05-26
1984-10-16
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123478, 123492, F02B 300
Patent
active
044768346
ABSTRACT:
A system for controlling air-fuel ratio of air-fuel mixture for an internal combustion engine having a two-barrel carburetor. The system is provided with an O.sub.2 sensor for detecting the concentration of oxygen in the exhaust gases, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the carburetor and an electronic control circuit. The electronic control circuit operates to compare output signal of the detector with a stoichiometric value, and to produce driving pulses for driving the on-off electromagnetic valve and for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A fixed signal generating circuit is selectively connected to the electronic control circuit. The two-barrel carburetor has an actuator actuated by the vacuum at the venturi of the carburetor for opening a throttle valve of the secondary side of the carburetor. A first switch is provided to be operated in response to the actuation of the actuator and connected to a second switch in the control circuit. The second switch connects the fixed signal generating circuit to the electronic control circuit for providing a fixed duty ratio for the valve and renders the electronic control circuit non-responsive to the output of the O.sub.2 sensor.
REFERENCES:
patent: 4202295 (1980-05-01), Kondo et al.
patent: 4240389 (1980-12-01), Shimazuki
patent: 4348996 (1982-09-01), Morozumi
patent: 4364358 (1982-12-01), Shikada et al.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nelli Raymond A.
Nissan Motor Company Limited
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