Internal-combustion engines – Charge forming device – With fuel pump
Patent
1979-02-09
1982-06-08
Levy, Stuart S.
Internal-combustion engines
Charge forming device
With fuel pump
123467, F02M 3902
Patent
active
043334369
ABSTRACT:
To provide for gradual admission of servo fluid to then operate a fuel injection pump to pus injected fuel out through the nozzle, a control valve element is used which has a displacement or deflection-vs.-servo fluid admission characteristic which provides for hydraulic choking of pressurized servo fluid being admitted to a servo cylinder chamber upon initiation of a fuel injection event, and thereby provide for gradual build-up of injection pressure of the fuel. By suitable shaping of the choke ducts, the admission of fuel can be first of a small quantity, then interrupted, and then of a selected, for example full servo fluid quantity; this can be accomplished by forming an intermediate land on a control slider or rotary valve element with a connecting passage forming a choke; or gradually decreasing choking effect of fluid admission, for example by forming relatively movable control surfaces at an inclination so that, upon initial opening of a fluid path, the inclined surface will provide for a constricted passage-way which then gradually opens to full admission of pressurized servo fluid.
REFERENCES:
patent: 3752137 (1973-08-01), Kimberley
patent: 3908621 (1975-09-01), Hussey
patent: 3921604 (1975-11-01), Links
patent: 3943901 (1976-03-01), Takahashi
patent: 3961612 (1976-06-01), Okamoto et al.
patent: 4069800 (1978-01-01), Kanda et al.
patent: 4170974 (1979-10-01), Kopse et al.
patent: 4182492 (1980-01-01), Albert et al.
Kopse Odon
Ziesche Kurt
Levy Stuart S.
Robert & Bosch GmbH
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