Robert Boschgmbh

Uwe Gordon

Detlev Potz

Guenter Lewentz

Achim Brenk

Manfred Mack

Wolfgang Klenk

Nestor Rodriguez-Amaya

Stefan Haug

Peter Boehland

Ralf Maier

Thomas Kuegler

Walter Egler

Hubert Greif

Werner Teschner

Sebastian Kanne

Hansjoerg Egeler

Giovanni Ferraro

Roland Mitter

Stefan Kampmann

Gerhard Mack

Roland Bleher

Ingolf Kahleyss

Detley Potz

Guenther Lewentz

Theodor Duetsch

Andreas Kreh

Christian Schmeisser

A method for injecting a gaseous medium, in particular a gaseous fuel, into an intake tract () of a gas engine or diesel-gas engine using an electromagnetically actuable gas valve (). In order to increase the flow speed, the gaseous medium is injected into the intake tract () via at least two throttling points () positioned in series.

Method and device for injecting a gaseous medium

The invention relates to a 3/2-port directional-control valve for controlling the injection of fuel in a common rail injection system of an internal combustion engine, with a first switched position in which an injection nozzle is connected to a fuel return and with a second switched position in which the injection nozzle is connected to a high-pressure fuel reservoir. The beginning of the injection takes place in a pressure-controlled manner, whereas the end of the injection takes place in a stroke-controlled manner.

3/2 Directional-control valve

The invention relates to a 3/2-way valve for controlling the injection of fuel in a common rail injection system of an internal combustion engine, having a first switching position, in which an injection nozzle is in communication with a fuel return, and a second switching position, in which the injection nozzle is in communication with a common rail. To improve the function and quality of the injection, the 3/2-way valve includes two force-balanced control pistons, which are guided separately from one another, and on each of which a respective valve seat edge is embodied.

3/2-way valve

The invention relates to a 3/2-way valve for controlling the injection of fuel in a common rail injection system of an internal combustion engine, having a first switching position, in which an injection nozzle is in communication with a fuel return, and having a second switching position, in which the injection nozzle is in communication with a high-pressure fuel reservoir. To improve the function and quality of the injection, the 3/2-way valve includes a force-balanced control piston, and the control edge of the control piston is pressure-equalized by means of a blind bore.

Seat/slide valve with pressure-equalizing pin

In a fuel injection nozzle having a nozzle body which body has one first and one second group of injection ports, one first and one second nozzle needle, and one separate pressure chamber for each nozzle needle, so that the injection needles are adjustable independently of one another between a closed position, in which the injection ports associated with the corresponding nozzle needle are closed, and an injection position, in which the corresponding injection ports are opened, a free choice of injection cross sections is to be made possible, while the design is simple. To that end, it is provided that the two nozzle needles adjoin one another.

Injection nozzle

A control valve and a fuel injection valve provided with same should be produced, in which it is possible to switch from a first operating state to a second operating state inexpensively and with short switching times, without requiring a hydraulic control line. To this end, a control valve is provided, which has a valve housing, a pressure chamber filled with electrorheological fluid, a displacing element that can slide in the valve housing and protrudes into the pressure chamber, and two electrodes that can apply an electrical field to the electrorheological fluid.

Control valve and fuel injection valve provided with same

A fuel injection system, having a fuel injection valve and a control valve, which control valve has a control valve member that is longitudinally displaceable in a control valve bore. A control valve sealing face is embodied on the control valve member; it cooperates with a control valve seat and thus controls the communication between a first pressure space and a second pressure space; the first pressure space communicates with a high-pressure collection chamber. In a valve body, a bore is embodied in which a pistonlike valve needle, with its end toward the combustion chamber, controls the opening of at least one injection opening by executing a longitudinal motion in response to the pressure in a pressure chamber; the pressure chamber communicates with the second pressure space via an inlet conduit. The first pressure space communicates via a throttle with a damping chamber, embodied as a blind bore and otherwise closed off, as a result of which pressure fluctuations that occur upon closure of the control valve are rapidly damped.

Fuel injection system 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.

In a fuel injection system for internal combustion engines, including an electronically triggered control valve with an axial through bore, which is divided by two valve seats into three annular chambers, to which respectively a supply line for fuel at high pressure, a high-pressure line leading away to an injection valve, and a relief line are connected, and having a control piston, which is guided in the through bore and which has two valve sealing faces cooperating with the two valve seats, respectively, the control piston according to the invention has a further valve sealing face, which cooperates with the first valve seat and whose spacing from the first valve sealing face is at least equal to the spacing between the second valve sealing face and the second valve seat when the first sealing seat is closed. A communication between the supply line and the relief line is thus reliably prevented.

Fuel injection device for internal combustion engines

A fuel injection valve for internal combustion engines, having a valve body in which a valve member is disposed, which valve member changes into a spring plate, which is disposed in a spring chamber that receives the closing spring provided with a valve stop face on an end face. A control piston is provided defining a hydraulic control chamber, which control piston protrudes into the spring chamber, whose end face toward the combustion chamber forms a stroke stop face. As a function of pressure in the control chamber, the control piston can be moved counter to the closing force of a restoring spring from a first stroke position, remote from the valve member, toward the valve member into a second stroke position, where the control piston limits the maximum opening stroke (h) of the valve member to a partial stroke (h ).

Fuel injection valve for internal combustion engines

The invention proposes a fuel injection valve for internal combustion engines, having a valve member (11), which can be displaced axially outward in a bore (9) of a valve body (1) counter to the force of a closing spring (47) and which on its end toward the combustion chamber has a closing head (13), protruding from the bore (9) and forming a valve closing member, that on its side toward the valve body (1) has a valve sealing face (15) with which it cooperates with a valve seat face (17) disposed on the end of the valve body (1) toward the combustion chamber, and having at least one injection opening on the closing head (13) which originates at a pressure chamber (19) and whose outlet opening is covered by the valve body (1) in the closing position of the valve member (11) and is uncovered in the outward-oriented opening stroke. In the fuel injection valve a damping chamber (35) is provided, which damps the stroke motion of the valve member (11) in the opening direction and moreover enables shaping of the course of injection.

A fuel injection valve for internal combustion engines, having a valve body member axially displaceable in a bore of the valve body. The valve member has a sealing face with which the sealing face cooperates with a valve seat on the valve body. The valve body has at least one injection opening, which can be uncovered in a course of a valve member opening stroke motion only after a certain idle stroke has been excited and the valve sealing face has lifted from the valve seat. The injection opening is provided in the wall of the valve body and an inlet opening of the injection opening is closable by the valve member.

Fuel injection nozzle for internal combustion engines

A fuel injection valve for internal combustion engines, with an outward-opening valve member which, at one end projects out of a guide bore in a valve body. The valve has a valve head which acts as a closing member and on which is arranged a sealing face that cooperates with a valve seat on the valve body and which forms a sealing edge. For a variable injection cross section, a sleeve is attached onto the valve member on the region of the valve member located near the valve-member head, in which sleeve are provided a plurality of rows of injection orifices which can be opened in succession with an increasing opening stroke of the valve member. In order to allow a reliable and sealing guidance of the valve member, an inflow duct to the injection orifices is designed as a recess in the valve-member shank, in such a way that a web region guiding and sealing off the valve member in the sleeve remains.

Growing community of inventors

Markgroeningen, Germany

Uwe Gordon