Internal-combustion engines – Charge forming device – Having fluidic logic control means
Patent
1980-08-01
1982-11-02
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Having fluidic logic control means
123589, F02D 500
Patent
active
043567975
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 such as an oxygen sensor for detecting the concentration of oxygen in the exhaust gases, an air-fuel mixture supply device, an on-off electromagnetic valve for correcting the air-fuel ratio of the air-fuel mixture supplied by the air-fuel mixture supply device and an electric controller. A throttle sensor produces an output dependent on the operation of the throttle valve. The electric controller is so arranged as to decrease variation of controlled air-fuel ratio. The electric controller comprises a comparator for comparing the output signal of the detector with a set value, an integration circuit connected to the comparator, a middle value detecting circuit for detecting a middle value between peak values of the output of the integration circuit, a triangular wave pulse generator, and a comparing circuit for comparing the output of the middle value detecting circuit with the triangular wave pulse for producing square wave pulses for driving the on-off electromagnetic valve for controlling the air-fuel ratio to a value approximately equal to the stoichiometric air-fuel ratio. A correcting device compensates for the delay of the output of the middle value detecting circuit.
REFERENCES:
patent: 4023357 (1977-05-01), Masaki
patent: 4029061 (1977-06-01), Asano
patent: 4171690 (1979-10-01), Hosaka et al.
patent: 4187812 (1980-02-01), Hosaka et al.
patent: 4237839 (1980-12-01), Ueno et al.
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Nelli Raymond A.
Nissan Motor Co,. Ltd.
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