Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1986-07-01
1987-12-01
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
123439, 261 501, F02M 718
Patent
active
047096772
ABSTRACT:
In order to insure that, even when there arises a change in the rate of air flowing through an intake mixture passageway, the air-fuel ratio of the mixture which is to be supplied to an engine is always kept constant, the fuel control system comprises: an intake mixture passageway having a first negative pressure generating section and a second negative pressure generating section provided upstream of the first negative pressure generating section for generating a negative pressure weaker than that in the first negative pressure generating section; a fuel passageway having its one end opening in the first negative pressure generating section and its other end connected to a float chamber via a fuel metering jet; an electromagnetic valve for controlling the rate of the fuel flowing through the fuel passageway; a negative pressure passageway having its one end opening in the second negative pressure generating section and having its other end connected to the fuel passageway at a site located between the fuel metering jet and the electromagnetic valve; and a level detecting means for detecting whether or not the fuel column formed within the negative pressure passageway is at a preset level and capable of generating an electric signal to control the operation of the electromagnetic valve. The first and second negative pressure generating sections are each constructed by a fixed and/or a variable venturi.
REFERENCES:
patent: 4201166 (1980-05-01), Nishimura
patent: 4208358 (1980-06-01), Atkins
patent: 4407248 (1983-10-01), Takeuchi
patent: 4630585 (1986-12-01), Maraux
Cox Ronald B.
Mikuni Kogyo Kabushiki Kaisha
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