Robert Boschgmbh

Maike Sander-Potz

Thomas Kuegler

Friedrich Moser

Peter Boehland

Christoph Buehler

Gerhard Mack

Joachim Winter

Wendelin Potz

Philippe Allio

The fuel injection system has one high-pressure fuel pump and one fuel injection valve for each cylinder of the engine. The fuel injection valve has a first hollow injection valve member and a second valve member guided displaceably, inside the first valve member for controlling first and second opening(s), respectively into the associated engine cylinder. The second valve member is movable by the pressure prevailing in a pressure chamber in an opening direction counter to a closing force and is acted upon at least indirectly by the pressure prevailing in a fuel-filled control chamber, which pressure is controllable as a function of operating parameters of the engine such that the second injection valve member, by means of the pressure prevailing in the control chamber, can be blocked, independently of an opening motion of the first injection valve member in a position that closes the at least one second injection opening.

Fuel injection device for an internal combustion engine

The fuel injection system has one high-pressure fuel pump () with a pump work chamber () and one fuel injection valve (), communicating with the pump work chamber, for each cylinder of the engine. The fuel injection valve () has a first injection valve member (), by which at least a first injection opening () is controlled, and which is movable in an opening direction () counter to a closing force by the pressure generated in the pump work chamber (). Inside the hollow first injection valve member (), a second injection valve member () is guided displaceably, by which at least a second injection opening () is controlled, and which is movable by the pressure prevailing in the pressure chamber () in an opening direction () counter to a closing force; the second injection valve member () is acted upon at least indirectly by the pressure prevailing in a fuel-filled control chamber (), which pressure is generated, as a function of operating parameters of the engine, by a feed pump () such that the second injection valve member () either remains in its closed position, or can open.

A fuel injection valve with a valve body has a bore that contains a piston-shaped valve member. The valve member is guided in the bore with a sealing section and a guiding section; between the sealing section and the guiding section, the valve member is encompassed by a first pressure chamber and between the guiding section and the combustion chamber end, is encompassed by a second pressure chamber. In the guiding section of the valve member, an annular collar is provided and has a side oriented toward the combustion chamber and a side oriented away from the combustion chamber. The annular collar has a throttle connection embodied on it, which connects the sides of the annular collar to each other and thus produces a throttled connection from the first pressure chamber to the second pressure chamber.

Fuel injection valves for internal combustion engines

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Stuttgart, Germany

Maike Sander-Potz