Feedback type variable venturi carburetor

Details Feedback type variable venturi carburetor Feedback type variable venturi carburetor

1980-05-19

1982-02-09

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123438, F02B 3300, F02M 700

Patent

active

043145353

ABSTRACT:
A feedback type variable venturi carburetor in which the negative pressure regulated by the variable venturi at a constant level is supplied to a solenoid valve which is opened and closed at a frequency of 5-30 Hz and whose open-close time ratio is controlled in accordance with the signal from exhaust gas sensor to control the vacuum pressure applied to a diaphragm chamber of an air-bleed flow control means thereby controlling the air-fuel ratio of the mixture at an optimum level. This invention obviates the use of a regulator for regulating the negative pressure from the intake manifold and precludes the drawbacks experienced with conventional carburetors, such as the slow response in the feedback control caused when the main fuel system and the idling system of the conventional carburetor are switched over, and the unstable supply of fuel when the fuel begins to be delivered from the main fuel system.

REFERENCES:
patent: 3911884 (1975-10-01), Moriya
patent: 3963009 (1976-06-01), Mennesson
patent: 3974813 (1976-08-01), Knapp
patent: 4089311 (1978-05-01), Brehschneider
patent: 4091781 (1978-05-01), Mituyasu
patent: 4167547 (1979-09-01), Takamaru

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