Abstract: A fuel injection system for an internal combustion engine including a fuel injector which can be subjected to fuel at high pressure and is actuatable via a metering valve device by which the pressure in a pressure booster control chamber is controllable such that the pressure in a pressure booster pressure chamber, defined by a pressure booster piston, that can be filled with fuel from the high-pressure fuel source via a filling path in which a check valve is disposed and that is in communication with an injection valve member pressure chamber, is increased by the pressure booster piston such that an injection valve member opens for injecting fuel, whereupon fuel is positively displaced out of a damping chamber via a damping path, in which a damping throttle is disposed.

Abstract: A fuel injection system for internal combustion engines, having a fuel injection nozzle supplied with fuel by a high-pressure fuel source, which fuel injection nozzle has a movable nozzle piston for opening and closing injection openings, an injection nozzle high-pressure chamber, and an injection nozzle control chamber. A pressure boosting device connected between the fuel injection nozzle and the high-pressure fuel source has a movable piston, a work chamber, and a high-pressure chamber, in which a filling connection which is open for filling the high-pressure chamber when the fuel injection nozzle is closed and is itself closed when the fuel injection nozzle is open.

Abstract: A fuel injection apparatus has a pressure booster located between a high-pressure reservoir and a nozzle chamber. A high-pressure chamber of this fuel injection apparatus communicates with the pressure line with a control chamber which actuates an injection valve member of a fuel injector and with the nozzle chamber. A compensation device is connected to a high-pressure line between the high-pressure reservoir and the fuel injector produces a throttled connection or an unthrottled connection between the high-pressure reservoir and the fuel injector.

Abstract: A fuel injection system for an internal combustion engine, having a fuel injector supplied with fuel from a high-pressure fuel source and including an injection valve member for opening or closing injection openings and a low-pressure circuit with a prefeed pump which pumps fuel from a fuel tank. Partial return fuel quantities, depressurized to the prefeed pressure of the prefeed pump, are delivered to the low-pressure circuit by pressure boosters or by fuel injectors inside an infeed portion via returns.

Abstract: The invention relates to a fuel injection device with a multi-part injector body containing a pressure booster that can be actuated by means of a differential pressure chamber, and includes a pressure booster piston that seals a working chamber off from the differential pressure chamber. An on-off valve, disposed above the injector body can actuate the fuel injection device. A pressure change in the differential pressure chamber occurs via a central control line that extends through the pressure booster piston of the pressure booster.

Abstract: A fuel injector having a pressure booster whose booster piston separates a working chamber, which is continuously acted on with fuel by means of a pressure source, from a differential pressure chamber that can be pressure-relieved; a pressure change in the differential pressure chamber occurs via an actuation of a servo-valve whose control chamber can be pressure-relieved by an on/off valve that also opens or closes a hydraulic connection of the differential pressure chamber to a first return on the low-pressure side. In the deactivated state of the pressure booster, a first sealing seat seals a return on the low-pressure side off from a high-pressure region of the servo-valve, which region is comprised of the control chamber, a first hydraulic chamber, and a second hydraulic chamber.

Abstract: A fuel injection system for internal combustion engines, having a fuel injector that can be acted upon by a high-pressure fuel source includes a pressure booster, which contains a movable boosting element dividing a work chamber which can be made to communicate with the high-pressure source via a high-pressure line from a high-pressure chamber that acts on the fuel injector. The high-pressure from chamber is variable by filling and evacuating a differential pressure chamber of the pressure booster. A filter element is received in a line portion that branches off from the high-pressure line and is upstream of flow connections for filling the differential and high pressure chambers.

Abstract: A fuel injector for injecting fuel into the combustion chamber of an internal combustion engine is equipped with a pressure booster that has a working chamber continuously connected to a common rail, and has a differential pressure chamber, which a piston part separates from the working chamber. The fuel injector also has an injection valve member. To actuate the fuel injector, a valve having a control valve in the form of a servo valve and an actuating valve that actuates this control valve. The multistage valve controls both the pressure booster and the injection valve member. The control valve and the actuating valve are hydraulically coupled to each other and different outlet throttles can be opened and closed in order to achieve different opening speeds of a servo valve piston.

Abstract: The invention relates to a system for injecting fuel into a combustion chamber of an internal combustion engine, having a fuel injector, which can be subjected to fuel at high pressure and which is actuatable via a metering valve, by which the pressure in an injection valve member control chamber or in a control line is controllable such that an injection valve member opens and closes for injecting fuel. The injection valve member control chamber can be evacuated via an outlet throttle device into a control line which has a smaller throttle cross section than an inlet throttle device, by way of which the injection valve member control chamber can be filled.

Abstract: A method for triggering a fuel injector via an on/off valve and a control valve that actuates it. The fuel injector has a pressure booster whose piston parts separate a working chamber from a differential pressure chamber. Via a compression chamber of the pressure booster, a nozzle chamber of the fuel injector can be acted on with highly pressurized fuel. The working chamber of the pressure booster communicates continuously with a common rail. During the main phase in which fuel is injected into the combustion chamber of an internal combustion engine, the control valve that actuates the on/off valve is triggered once or multiple times so that the maximum pressure level occurring at the combustion chamber end of a one-part or multipart injection valve member falls below the maximum achievable pressure level.

Abstract: The invention relates to a triggering method for triggering a fuel injector having a control valve that activates or deactivates a pressure booster of the fuel injector. The control valve is embodied as a directly controlled solenoid valve whose magnetic coil can be supplied with at least two different triggering current levels to vary the opening speed of the valve member of the control valve. The valve member of the control valve is associated with a hydraulic damper that slows its opening speed.

Abstract: A fuel injector having an injection valve connected to a high-pressure source and a control valve including a control piston guided in a valve body and comprising a pressure piston section having a first pressure surface guided in a bush and a control piston section with a sliding seal that has a control edge; the bush is contained in a pressure chamber of the valve body. In a first valve position, a sealing seat of the control piston disconnects a valve chamber from a low-pressure/return system and in a second valve position, the control edge of the control piston disconnects the pressure chamber from the valve chamber; in the second valve position, a connection is simultaneously produced between the valve chamber and the low-pressure/return system, thus initiating an actuation of the fuel injection valve. The control piston section with the control edge is guided in a control cylinder that is contained in the pressure chamber of the valve body and is separate from the bush.

Abstract: A fuel injection apparatus having a fuel injector fed by a high-pressure fuel source and having an injection valve with injection nozzles associated with coaxial inner and outer nozzle needles can be actuated in a pressure-dependent manner to open and close various injection cross sections at the injection nozzles. A pressure surface of the outer nozzle needle is associated with a closing chamber. To actuate the outer nozzle needle, a first on/off valve can connect the closing chamber to a low-pressure/return system. The inner nozzle needle has a control piston whose pressure surface protrudes into a second control chamber, and a second on/off valve is can connect the control chamber to the low-pressure/return system so that when the second on/off valve is actuated, the pressure is relieved in the second control chamber. This permits a separate actuation of the outer nozzle needle and inner nozzle needle.

Abstract: A fuel injection system includes a pressure chamber having a displacable piston which can be subjected to pressure via a low-pressure-side pressure booster chamber for compressing the fuel in a high-pressure-side pressure booster chamber to be delivered to an injector. The stroke of the piston is controllable essentially by the pressure in a differential chamber of the pressure chamber and is used to vary the fuel pressure delivered to the injector. Provision is made for enlarging the cross section of the outlet cross section out of the differential chamber of the pressure chamber are provided. The fuel pressure during the injection can be varied. A pressure increase can be simply achieved.

Abstract: A fuel injection system for internal combustion engines in which a high-pressure fuel source supplies fuel to a fuel injector and a pressure booster disposed between an injection valve and the high-pressure fuel source has a booster piston which separates a pressure chamber which can be connected to the high-pressure fuel source from a high-pressure chamber that acts upon a nozzle chamber of the fuel injector. The injection valve includes a nozzle needle having a first nozzle needle part and a second nozzle needle part which being triggered as a function of pressure open and close various injection cross sections of an injection nozzle.

Abstract: A fuel injection system for internal combustion engines having a fuel injection valve communicating with a high-pressure source includes a control valve, which has a valve body with a longitudinally displaceably guided control piston. The control piston is guided in a bush, which is surrounded at least partly inside the valve body by an annular chamber, which communicates with the high-pressure source.

Abstract: A device for injecting fuel into a combustion chamber of an internal combustion engine, including an injector body which contains an injection valve element which can be actuated through pressurization/pressure relief of a control chamber by means of a control valve. A pressure booster having a piston unit that divides a working chamber from a control chamber of the pressure booster acts on a compression chamber that communicates with a nozzle chamber encompassing the injection valve element. A pressurization or pressure relief of the control chamber of the pressure booster occurs as a function of the stroke motion of the injection valve element.

Abstract: A fuel injection system includes a pressure booster having a displaceable piston which can be subjected to pressure via a pressure booster chamber on the low-pressure side for compressing the fuel in a pressure booster chamber on the high-pressure side to be delivered to an injector. The stroke of the piston is controllable by the pressure in a differential chamber of the pressure booster and is used to vary the fuel pressure delivered to the injector. Means for continuously variable definition of the inlet cross section to the pressure booster chamber of the pressure booster on the low-pressure side or of the outlet cross section from the differential chamber of the pressure booster are provided.

Abstract: A device for injecting fuel into the combustion chamber of an internal combustion engine including a high-pressure storage chamber, a pressure booster, and a metering valve. The pressure booster includes a work chamber and a control chamber separated from one another by an axially movable piston. A pressure change in the control chamber causes a pressure change in a compression chamber of the pressure booster. The compression chamber acts upon a nozzle chamber in the nozzle body. A pressure relief valve (40) is in a control line between the control chamber of the pressure booster and a 2/2-way metering valve, the pressure relief valve includes a valve body that acts upon at least one hydraulic chamber and can be made to communicate with the pressure prevailing in the high-pressure storage chamber.

Abstract: A fuel injector for injecting fuel into a combustion chamber of an internal combustion engine, having a pressure booster in which the piston divides a work chamber, acted upon permanently by fuel via a pressure source, from a pressure-relievable differential pressure chamber. A pressure change in the differential pressure chamber is effected via an actuation of a servo valve. The control chamber of the servo valve can be pressure-relieved via a relief valve and which opens or closes a hydraulic connection of the differential pressure chamber with a return. For closing the servo valve piston, the control chamber can be acted upon by a fuel volume diverted from the differential pressure chamber. The action of fuel on the control chamber is effected via lines that contain throttle restrictions. A pressure relief of the control chamber is effected via a relief valve into a return on the low-pressure side.