Fuel injection valve for internal combustion engines

Details Fuel injection valve for internal combustion engines Fuel injection valve for internal combustion engines

1997-06-10

1998-07-07

Moulis, Thomas N.

Internal-combustion engines

Charge forming device

Fuel injection system

25112915, F02M 4100, F16K 3202

Patent

active

057753016

ABSTRACT:
A fuel injection valve (1; 2) for the intermittent injection of fuel into the combustion chamber of an internal combustion engine is equipped with a hydraulic control device (15; 100). The opening or closing of a control bore (61; 109) is brought about by means of an electrically controlled solenoid valve (5; 6; 7), with the result that a control pressure in a control chamber (60; 114) is influenced, thus causing the opening or closing of injection ports into the combustion chamber via a control piston (30; 110) and an injection-valve member (24). The injection event is controlled additionally by controlling the movement of a solenoid-valve pilot-valve stem (70; 125) assigned to the control bore (61; 109). Means, by which the opening movement of the injection valve member (24) takes place in two successive phases, are provided. As a result of this additional control, at any given system pressure and with the construction remaining the same, the time trend of the injection event can be adapted in an optimum manner to the conditions demanded by the internal combustion engine and the operating behavior can be improved.

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patent: 5671715 (1997-09-01), Tsuzuki

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