Injection device for an internal combustion engine with direct i

Details Injection device for an internal combustion engine with direct i Injection device for an internal combustion engine with direct i

1996-03-28

1997-09-02

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

123506, 417440, F02M 3704

Patent

active

056620870

ABSTRACT:
Fuel injection system for an internal combustion engine with direct fuel injection, with an electromagnetic control valve for pressurization of a medium-pressure space, and a hydraulic amplification plunger comprising a medium-pressure plunger adjacent to the medium-pressure space and a high-pressure plunger adjacent to a high-pressure space, which latter is connected to a fuel delivery line on the one side and a nozzle space surrounding the fuel needle on the other side, the high-pressure space connecting to a fuel bypass line in at least one intermediate position of the high-pressure plunger. To improve rate shaping, especially at the beginning and end of injection, the proposal is put forward that in addition to the high-pressure plunger a pressure-dependent bypass valve be located in the flow path between the high-pressure space and the fuel bypass line, which bypass valve opens the flow connection between high-pressure space and fuel bypass line for a narrow range of pressures in the high-pressure space.

REFERENCES:
patent: 4074668 (1978-02-01), Indra
patent: 4598685 (1986-07-01), Logie et al.
patent: 4605166 (1986-08-01), Kelly
patent: 5529042 (1996-06-01), Augustin et al.

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