Apparatus and method for averting the effects of seal failure in

Details Apparatus and method for averting the effects of seal failure in Apparatus and method for averting the effects of seal failure in

1978-10-05

1980-02-12

Myhre, Charles J.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123140MP, 123198DB, 251 614, 137312, F02M 3900, F02D 104, F02B 7700, F16K 31365

Patent

active

041878175

ABSTRACT:
An air fuel ratio control for an I.C. engine fuel supply system is disclosed including a diaphragm operator for a fuel flow modulating valve responsive to engine intake manifold pressure as sensed through an air line connecting the diaphragm operator with the intake manifold and a drain line for returning to the engine fuel tank all fuel which may leak into the diaphragm operator due to seal rupture. The disclosed system further including a specially designed flow restrictor in the air line to prevent engine fuel tank pressurization and reverse fuel flow into the engine's intake manifold should the diaphragm operator rupture. The flow restrictor includes a control orifice which is sufficiently large to allow proper control by the diaphragm operator but yet not so large as to allow fuel tank pressurization should the diaphram rupture. In one embodiment the flow restrictor includes a check valve designed to close only upon improper fuel flow from the air fuel control to the intake manifold. To avoid manufacturing tolerances, the check valve may be calibrated to close at precisely the proper miminal flow rate.

REFERENCES:
patent: 2552960 (1951-05-01), Grieshaber
patent: 3084901 (1963-04-01), Thorburn
patent: 3241805 (1966-03-01), Schumann
patent: 3450206 (1969-06-01), Watkins
patent: 3805760 (1974-04-01), Yagi
patent: 3868890 (1975-03-01), Roberts
patent: 3896843 (1975-07-01), Millar
patent: 3945302 (1976-03-01), Downs
patent: 4054116 (1977-10-01), Coddington
patent: 4059088 (1977-11-01), Tateno
patent: 4095572 (1978-06-01), Scholtz

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