Abstract: A fuel injection apparatus includes a shared pressure reservoir, an injector, a pressure intensifier, and valves for controlling the injection process and the pressure intensification. A modular design is produced by means of a pressure intensifier module, and a valve module, thereby reducing costs and increases flexibility in the manufacture of fuel injection apparatuses.

Abstract: A device and a method for controlling an exhaust-gas aftertreatment system, in particular for an internal combustion engine, are described. The exhaust-gas aftertreatment system includes at least one catalytic converter. A reducing agent is supplied to the exhaust-gas aftertreatment system. An exhaust gas mass flow is preselectable on the basis of the power consumption by a sensor and/or on the basis of a pressure variable.

Abstract: A fuel injection system includes a pressure chamber. The pressure chamber has a displaceable piston (24), 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 (24) 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. Means (24, 25) 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 achieved with simple means.

Abstract: A fuel injection system has one or more unit fuel injectors or pump-line-nozzle units, corresponding in number to the cylinders, for compressing the fuel. The fuel injection system includes means for generating two different injection pressures during the injection and at least one valve for controlling the injection with a cross sectional control. The fuel injection with the aid of the unit fuel injector or a pump-line-nozzle unit can be achieved over a wide rpm range with great precision.

Abstract: A method for injecting fuel at at least two different high fuel pressures via injectors into the combustion chamber of an internal combustion engine. The fuel injection at the higher fuel pressure takes place by pressure-controlled features, during the fuel injection, at least one lower fuel pressure is generated. To that end, a fuel injection system has one local diversion unit for each injector, and the diversion unit can be activated or deactivated via a valve unit.

Abstract: A device and a method for controlling an exhaust-gas aftertreatment system, in particular for an internal combustion engine, is described. The exhaust-gas aftertreatment system includes at least one catalytic converter. A preselectable quantity of reducing agent is supplied to the exhaust-gas aftertreatment system as a function of the state of the internal combustion engine and/or the exhaust-gas aftertreatment system. The quantity of reducing agent supplied is adjusted.

Abstract: In a fuel injection system for an internal combustion engine, in which fuel at at least two differently high fuel pressures can be injected via injectors into the combustion chamber of the engine, parallel to a bypass line a hydraulic pressure booster is provided for generating the higher fuel pressure; the pressure booster is actuatable and deactuatable via a valve unit. Since the pressure booster is not constantly in operation, and the losses from friction are also reduced, the efficiency is improved.

Abstract: A fuel injection system includes a pressure booster. The pressure booster has a displaceable piston (24), which can be subjected to pressure via a pressure booster chamber on the low-pressure side, for compressing the fuel, to be delivered to an injector, in a pressure booster chamber on the high-pressure side. The stroke of the piston (24) is controllable essentially by the pressure in a differential chamber of the pressure booster and is used to vary the fuel pressure delivered to the injector. Means (24, 25) 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 fuel injection is effected by means of a high-pressure pump (2) and a pressure reservoir chamber (6) for generating and storing a first system pressure. This system pressure is not used for injection; instead, by means of the pressure booster unit (9), a higher injection pressure is generated during the injection, and this injection pressure can be reduced to shape the course of injection. By means of this invention, an improved capability of metering the fuel injection and an improved execution of fast switching times are achieved.

Abstract: A pressure-controlled fuel injection system (1) has a common pressure reservoir, one injector (3) per cylinder, and one local pressure booster (4) assigned to each injector (3). A 2/2-way valve (14) is provided for metering fuel to the injector (3).

Abstract: A fuel injection system (1) for internal combustion engines has at least one stroke-controlled injector (10). A pressure booster (9) that has a movable piston (26) is connected between the at least one injector (10) and a high-pressure working medium source (5). The movable piston (26) divides a primary chamber (13), which can be connected to the high-pressure working medium source (5), from a pressure chamber (8) that communicates with the at least one injector (10) and is filled with fuel. The pressure booster (9) generates a first fuel system pressure in the injector (10), which is used for the injection. The fuel injection system (1) has means for furnishing a further, second fuel system pressure, and these means can be used for injection without activating the pressure booster (10).

Abstract: In a fuel injection system for an internal combustion engine, in which the fuel pumped by means of a high-pressure pump can be injected into the combustion chamber of the engine at at least two different, high fuel pressure via injectors, between the high-pressure pump and the injectors, at least one central pressure booster unit for all the injectors is provided. The pressure booster unit is triggerable in a targeted way as need, and as a result the fuel which is at the higher pressure can be better regulated in quantity, and the losses from friction can be reduced accordingly as well.

Abstract: A device for generating a mixture of reducing agent and air, having a mixing space (16) into which reducing agent via a reducing agent delivery conduit (64) and air via an air delivery conduit (61) can be introduced into the mixing space (16), having means for pressurizing the air, in such a way that the air flows essentially at the speed of sound through the air delivery conduit (61).

Abstract: In a fuel injection system for an internal combustion engine, having at least two different, high system pressures, in which a first pressure reservoir, supplied by a high-pressure pump, is provided for the higher system pressure, and a second pressure reservoir is provided for the lower system pressure, and at least the first pressure reservoir can be made to communicate by line for a fuel injection with the injectors of the individual cylinders of the engine, the pressure level of the high-pressure pump is greater than the higher system pressure, and the first pressure reservoir has an overpressure valve leading to the second pressure reservoir, and the second pressure reservoir has an overpressure valve leading to the fuel tank.

Abstract: A fuel injection apparatus (1) includes a shared pressure reservoir (6), an injector (8), a pressure intensifier, and valves for controlling the injection process and the pressure intensification. A modular design is produced by means of a pressure intensifier module (16), and a valve module (17). This reduces costs and increases flexibility in the manufacture of fuel injection apparatuses.

Abstract: An injection device with an injection nozzle (42), a pressure intensifier (12) for intensifying a primary pressure, a first valve device (32) for triggering the pressure intensifier (12), and an actuator for actuating the first valve device (32), wherein the pressure intensifier (12) is activated in a first state of the first valve device (32), the pressure intensifier (12) is deactivated in a second state of the first valve device (32), and a limitation of the through flow quantity to the injection nozzle (42) is provided. The invention also relates to a method, which makes advantageous use of the device according to the invention.

Abstract: The invention relates to an injection device with an injector (12), a pressure intensifier (16) for intensifying a primary pressure, a valve device (18, 20) for actuating the pressure intensifier (16), and an actuating element (22) for actuating the valve device (18, 20), wherein the valve device has at least one first 2/2-port directional-control valve (18) and one second 2/2-port directional-control valve (20), which can be actuated by the actuating element (22). The invention also relates to a method for injecting fluid, in which an actuating element (22) is activated, the actuating element (22) actuates a valve device (18, 20), the valve device (18, 20) actuates a pressure intensifier (16) for intensifying a primary pressure, and an injector (12) is opened, wherein the actuating element (22) actuates a first 2/2-port directional-control valve (18) and a second 2/2-port directional-control valve (20) of the valve device.

Abstract: An injection nozzle of a pressure-controlled fuel injection system has a control chamber for exerting pressure on a nozzle needle. The control chamber is connectable to a pressure reservoir via a pressure line that includes a 2/2-way valve. On the end of the nozzle needle that can be acted upon by pressure and is remote from the injection opening, a bore is embodied, by way of which the control chamber of the injection nozzle can be made to communicate with a leakage line as a function of the stroke of nozzle needle.

Abstract: A method and system for injecting fuel in at least two different high fuel pressures via injectors into a combustion chamber of an internal combustion engine. The higher fuel pressure being stored in a central pressure reservoir, the lower fuel pressure is generated individually locally for each injector, at all times during the injection event by diversion of the higher fuel pressure. The diversion being activatable or deactivatable via a multi-way valve. To that end, a corresponding fuel injection system with a central pressure reservoir for storing the higher fuel pressure has a local diversion unit for each injector by means of which the lower fuel pressure can be generated dissipatively from the higher fuel pressure, and the local diversion unit has a multi-way valve for activating and deactivating the diversion, respectively. In this way, an improved metering of the lower fuel pressure can be achieved.

Abstract: A fuel injection system includes a pressure storage chamber and one injector assigned to each cylinder, which injector can be connected to the pressure storage chamber via a pressure line that includes a metering valve. Using a single 2/2-way valve as a metering valve per cylinder makes for a more-economical manufacture of a fuel system, especially for small engines. The fuel injection is done under pressure control.