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US 2004/0069276 A1Published application
Fuel injection system for an internal combustion engine
AssigneeRobert Bosch GmbH
InventorMarcus Parche
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AssigneeRobert Bosch GmbH
InventorMarcus Parche
Estimating the term…
The fuel injection system has a fuel injection valve (12) with an injection valve member (34), by which at least one injection opening (36) is controlled, and the injection valve member (34) is acted upon by the pressure prevailing in a pressure chamber (44) of the fuel injection valve (12) and is movable by this pressure, counter to the force of a closing spring (48) disposed in a spring chamber (50), in an opening direction to open the at least one injection opening (36), and fuel is delivered under high pressure to the pressure chamber (44) by a high-pressure fuel pump (10) for a fuel injection. The injection valve member (34) is urged in the closing direction at least indirectly by the pressure prevailing in a spring chamber (50) of the fuel injection valve (12). The pressure in the spring chamber (50) is variable; the spring chamber (50) has a communication with a pressure source (66; 20), which is controlled by a valve (67). Thus different opening pressures of the fuel injection valve (12) for a preinjection and a main injection of fuel can be attained.
A fuel injection system for an internal combustion engine, having a fuel injection valve (12), which has an injection valve member (34), by which at least one injection opening (36) is controlled, and the injection valve member (34) is acted upon by the pressure prevailing in a pressure chamber (44) of the fuel injection valve (12) and is movable by this pressure, counter to the force of a closing spring (48) disposed in a spring chamber (50) of the fuel injection valve (12), in an opening direction to open the at least one injection opening (36), and fuel is delivered under high pressure to the pressure chamber (44) by a high-pressure fuel pump (10) for a fuel injection, characterized in that the injection valve member (34) is urged in the closing direction at least indirectly by the pressure prevailing in a spring chamber (50) of the fuel injection valve (12);
The fuel injection system of claim 6, characterized in that a chamber (62) separated from the spring chamber (50) toward the partition (58) communicates with a low-pressure region (69).
The fuel injection system of one of the foregoing claims, characterized in that during one fuel injection cycle, at the onset, for a preinjection of fuel in the spring chamber (50), a low pressure is set;
The fuel injection system of one of the foregoing claims, characterized in that the spring chamber (50) has a communication with a pressure source (66;
The fuel injection system of one of the foregoing claims, characterized in that the spring chamber (50) has a communication with a low-pressure region (69), in which at least one throttle restriction (70) is provided.
The fuel injection system of one of the foregoing claims, characterized in that this system has one fuel injection valve (12) and one high-pressure fuel pump (10), which form a common structural unit, for each cylinder of the engine.
Dependencies are inferred from the claim text.