Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1979-04-23
1980-10-28
Lazarus, Ronald H.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123522, 123575, 123579, 261 36A, 261 70, F02M 3714, F02M 1710, F02M 1908
Patent
active
042300827
ABSTRACT:
A carburetor of an internal-combustion engine in an automotive vehicle has at least one main duct and an ancillary duct supplying an air/fuel mixture to a manifold, the fluid flow through the ducts being controlled by an accelerator via ganged butterfly valves of which the one in the main duct closes completely whereas the one in the ancillary duct closes only partially in an idling position. Separate nozzles deliver fuel to the main duct at a higher hydrostatic head and to the ancillary duct at a lower hydrostatic head, thereby preventing the aspiration of an excessive amount of fuel by the piston cylinders upon deceleration of the vehicle or during idling. The fuel is admitted to the ducts, between a Venturi throat and the butterfly valves, by nozzles fed from a common float-controlled pressure regulator, or from two such pressure regulators, to which the fuel is delivered by gravity from a buffer reservoir also provided with a float valve and connected to the high-pressure side of a fuel pump. In order to avoid unduly lean mixtures in the wide-open position of the butterfly valves, the airstream entering the ancillary duct may be precharged with fuel vapor by being forced to pass through a pool of fuel before reaching that duct. The buffer reservoir has an overflow line leading to the low-pressure side of the pump, directly or via the fuel tank. A check valve, operated by toggle action or by simple flotation, is inserted in the overflow line to prevent reverse surges to the buffer reservoir.
REFERENCES:
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patent: 3910302 (1975-10-01), Sudhir
patent: 4007721 (1977-02-01), Regueiro
Lazarus Ronald H.
Ross Karl F.
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