Fuel metering method and apparatus

Gas and liquid contact apparatus – Fluid distribution – Pumping

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Details

261 692, 261 70, 261DIG67, 261DIG68, F02M 508, F02M 1704

Patent

active

051339056

ABSTRACT:
Method, system and apparatus for metering fuel to an internal combustion engine via a carburetor having a mixture conduit with a venturi therein. A main fuel nozzle supplies fuel to the venturi of the carburetor in response to the static pressure drop induced across an associated main fuel flow controlling restriction by the engine intake induced air flow through the carburetor mixture conduit. A pitot tube is disposed in the venturi with an opening facing upstream in a zone of maximum air flow through the carburetor venturi. A vent passageway system connects the pitot tube to a single closed air chamber cooperable with either a diaphragm or a float to regulate operation of an inlet valve controlling flow of fuel to a main fuel controlling restriction. The adverse effect of engine intake induced tuning pressure wave forms in the mixture conduit of the carburetor transitting the venturi is eliminated, reduced or modulated by the dynamic pressure exerted by said tuning waves at the pitot tube and transmitted by the vent passageway to said chamber and to said main fuel restriction.

REFERENCES:
patent: 1720916 (1929-07-01), Monier
patent: 2232351 (1941-02-01), Udale
patent: 2507075 (1950-05-01), Wiegand et al.
patent: 2552056 (1951-05-01), Orr, Jr.
patent: 2796243 (1957-06-01), McDuffie
patent: 2937858 (1960-05-01), Blodgett
patent: 3236505 (1966-02-01), Phillips
patent: 4159012 (1979-06-01), Pizzuto et al.
patent: 4323522 (1982-04-01), Rasmussen
patent: 4499032 (1985-02-01), Shibano
patent: 4759883 (1988-07-01), Woody et al.

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