Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1981-01-27
1983-08-16
Lazarus, Ira S.
Internal-combustion engines
Charge forming device
Fuel injection system
123458, 123459, 123460, F02M 3900
Patent
active
043985181
ABSTRACT:
A fuel injection apparatus for internal combustion engines is proposed (FIG. 1), in which the onset and end of injection are determined by a hydraulically actuated control slide. The injection pumps of the apparatus, which are preferably combined with an injection nozzle to make a pump
ozzle unit, having a central magnetic valve assembly comprising two magnetic valves switched hydraulically in parallel, which valve assembly is inserted in a connection between a control pressure line, which can be placed under control pressure (P.sub.S) from a source of control fuel, and a low-pressure line which is under supply pressure (P.sub.V). In order to initiate the onset of injection, the control slide is placed under control pressure (P.sub.S) by the valve assembly via a distributor apparatus and closes an overflow channel leading out of the pump work chamber. In order to control the end of the injection, the control slide, during its return stroke, relieves this overflow channel toward a low-pressure line. The control pressure (P.sub.S) in the control pressure line required for actuation of the stroke movement of the control slide is built up by means of the valve assembly as a result of blocking the outflow from this line.
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Leblanc Jean
Pigeroulet Jean
Straubel Max
Greigg Edwin E.
Lazarus Ira S.
Moy Magdalen
Robert-Bosch GmbH
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