Patent ID: 6651626
Filing Date: 2003-11-25
Classification: F02M

Abstract:
A fuel injection apparatus for internal combustion engines, the apparatus comprisingone fuel pump (10) for each cylinder of the engine, which pump has a pump piston (18), driven by the engine in a reciprocating motion, that defines a pump work chamber (22) to which fuel is delivered from a fuel tank (24) and which communicates with a fuel injection valve (12) that has an injection valve member (28) by which at least one injection opening (32) is controlled and which is movable in an opening direction (29) counter to a closing force by the pressure generated in the pump work chamber (22), a first electrically controlled control valve (60), by which a communication (59) of the pump work chamber (22) with a diversion chamber (62) is controlled, and a second electrically controlled control valve (68; 168; 268), by which the pressure prevailing in a control pressure chamber (52) of the fuel injection valve (12) is controlled, by which the injection valve member (28) is urged at least indirectly in the closing direction, the diversion chamber (62) being a pressure reservoir, in which an elevated pressure, compared to the pressure prevailing in the fuel tank (24), is maintained.