Robert Boschgmbh

Gerhard Mack

Thomas Kuegler

Peter Boehland

Friedrich Moser

Christoph Buehler

Joachim Winter

Maike Sander-Potz

Philippe Allio

Friedrich Boecking

Holger Rapp

Uwe Gordon

Detlev Potz

Achim Brenk

Manfred Mack

Wolfgang Klenk

Juergen Hanneke

Wilhelm Christ

Wolfgang Fleiner

Roland Bleher

Wendelin Potz

Manfred Fink

Ralf Heinecke

Taner Narin

Ulrich Kunzi

Lars Schaab

Lars Thuener

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 for internal combustion engines having a valve body in which a bore is embodied, a valve seat face, at least one injection opening embodied on the end toward the combustion chamber of the bore, and at least one injection opening connecting the bore with the combustion chamber of the engine. A nozzle needle is longitudinally displaceably guided in the bore and on its end toward the combustion chamber it has a sealing face, which cooperates with the valve seat face and thus controls the at least one injection opening. The nozzle needle has a central longitudinal bore, in which an inner needle is disposed that is fixed immovably relative to the valve body. The nozzle needle is guided over at least part of its length on the inner needle, so that the nozzle needle is kept exactly centrally in the bore at all times.

Fuel-injection valve for internal combustion engines

In an injection nozzle for a fuel injection system, the opening stroke of the nozzle needle is to be limited selectively, so that different injection cross sections can be employed. To that end, the injection nozzle is provided with a nozzle body, a nozzle needle displaceable in the nozzle body, two groups of injection ports, which are uncovered as a function of an opening stroke of the nozzle needle, a piston that is connected to the nozzle needle, a stop chamber in which the piston is disposed and which is provided with an outlet, and a control valve that can open and close the outlet of the stop chamber, as a result of which the stroke of the piston in the stop chamber and thus the opening stroke of the nozzle needle can be selectively limited.

Injection nozzle

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Stuttgart, Germany

Gerhard Mack