Abstract: An injection system for an internal combustion engine has a prefeed pump for delivering fuel from a fuel tank, a high pressure pump for delivering the fuel to a fuel accumulator arranged downstream of the prefeed pump, an accumulator return line arranged downstream of the fuel accumulator and used to return the fuel from the fuel accumulator to the fuel tank, and a valve arranged in the accumulator return line and by which the fuel can be optionally supplied to the fuel tank or to a tank bypass line which hydraulically leads to a point between the prefeed pump and the high pressure pump. A pressure relief valve is arranged in the accumulator return line downstream of the valve and upstream of the fuel tank. The pressure relief valve is suitably designed to allow adjustment of a fuel pressure in the accumulator return line upstream of the pressure relief valve.

Abstract: A method for operating an injection system has the following steps: determining, based on a pilot control characteristic, a prefeed value depending on an internal combustion engine operating parameter; initializing a correction value for the prefeed pump by a safety value predetermined for compensating deviations from a predetermined delivery behavior of the prefeed pump, which deviations lie within a predetermined tolerance range, for guaranteeing a sufficient pump delivery rate; controlling the prefeed pump depending on the prefeed and the correction values; adapting the correction value effecting the delivery behavior of the prefeed pump depending on a variable of the system the value or value curve of which indicates that a desired pressure can be generated in the fuel accumulator, namely in the sense of reducing the delivery output of the prefeed pump, as long as the value indicates that the desired pressure can be generated in the fuel accumulator.

Abstract: A fuel injection system for an internal combustion engine has a fuel distributor (2), in the interior space (4) of which is formed a high-pressure accumulator, wherein transverse bores (6) open into the interior space (4). The transverse bores (6) are connected by connecting pipes (8a, 8b) to pressure lines (10) for the supply and discharge of fuel. A high-pressure sensor (30) is arranged at the face-side end of the fuel distributor (2), which high-pressure sensor (30) is connected by a measurement bore (30c) to the interior space (4), and a permanent magnet ring is arranged at that face-side end of the interior space (4) which is assigned to the high-pressure sensor (3).

Abstract: A fuel injection system of an internal combustion engine includes a first and a second fuel pump, a leakage-prone volume flow regulating valve arranged in a fuel line between the first and the second fuel pump, and a control unit configured to actuate the first fuel pump as a function of a position of the leakage-prone volume flow regulating valve, such that the leakage-prone volume flow regulating valve serves as the sole actuating element for pressure regulation in the fuel injection system. An associated pressure regulating method is also disclosed.

Abstract: A method is disclosed for operating a high-pressure accumulator fuel injection system for an internal combustion engine of a motor vehicle which has a stop-start automatic function by way of which the internal combustion engine can be switched off and restarted afterwards independent of the intervention of the driver of the motor vehicle, the fuel being conveyed to the high-pressure accumulator as needed by means of a high-pressure pump and the pressure of the fuel being adjusted on the pressure side by means of a pressure control valve which is electrically actuated and open when de- energized. According to the method, the supply with power of the pressure control valve is adapted to the prevailing pressure in the high-pressure accumulator during a stop phase within a stop-start cycle.

Abstract: A device is provided for preventing the engine from stalling in a vehicle equipped with a diesel injection system, particularly a common-rail injection system. The device comprises a volume flow control valve, a high-pressure fuel pump, a pressure control valve, one or more injectors and a control unit. The control unit carries out a pressure control by controlling the volume pressure control valve in the idle state of the engine in a first operating mode, monitors whether a working point is present at which a release of air from the fuel is carried out and, in the event such a working point is detected, initiates a second operating mode in which a pressure control is carried out by controlling the pressure control valve.

Abstract: In a method and a device for the volume flow control of an injection system, a seat valve (3) is used for the volume flow control. For this purpose, the influence of the pressure present upstream of the seat valve (3) is taken into consideration in the volume flow control.

Abstract: An injection system for an internal combustion engine has a prefeed pump for feeding fuel from a fuel tank, a high-pressure pump, which is situated downstream of the prefeed pump, for feeding the fuel into at least two injectors, a fuel distributor which is situated downstream of the high-pressure pump and which is designed to distribute the fuel to the injectors, a pressure control or pressure limiting valve situated downstream of the high-pressure pump and by which the pressure to be produced in the fuel distributor can be adjusted or limited, and a pressure sensor for determining a pressure downstream of the high-pressure pump and upstream of the pressure control or pressure limiting valve, wherein the pressure sensor, the pressure control or pressure limiting valve and the fuel distributor are formed in a high-pressure module, and the high-pressure module is formed as a structural unit with the high-pressure pump.

Abstract: An injection system for an internal combustion engine has a prefeed pump for delivering fuel from a fuel tank, a high pressure pump for delivering the fuel to a fuel accumulator arranged downstream of the prefeed pump, an accumulator return line arranged downstream of the fuel accumulator and used to return the fuel from the fuel accumulator to the fuel tank, and a valve arranged in the accumulator return line and by which the fuel can be optionally supplied to the fuel tank or to a tank bypass line which hydraulically leads to a point between the prefeed pump and the high pressure pump. A pressure relief valve is arranged in the accumulator return line downstream of the valve and upstream of the fuel tank. The pressure relief valve is suitably designed to allow adjustment of a fuel pressure in the accumulator return line upstream of the pressure relief valve.

Abstract: A method for operating an injection system has the following steps: determining, based on a pilot control characteristic, a prefeed value depending on an internal combustion engine operating parameter; initializing a correction value for the prefeed pump by a safety value predetermined for compensating deviations from a predetermined delivery behavior of the prefeed pump, which deviations lie within a predetermined tolerance range, for guaranteeing a sufficient pump delivery rate; controlling the prefeed pump depending on the prefeed and the correction values; adapting the correction value effecting the delivery behavior of the prefeed pump depending on a variable of the system the value or value curve of which indicates that a desired pressure can be generated in the fuel accumulator, namely in the sense of reducing the delivery output of the prefeed pump, as long as the value indicates that the desired pressure can be generated in the fuel accumulator.

Abstract: An injection system for an internal combustion engine has a prefeed pump for feeding fuel from a fuel tank, a high-pressure pump, which is situated downstream of the prefeed pump, for feeding the fuel into at least two injectors, a fuel distributor which is situated downstream of the high-pressure pump and which is designed to distribute the fuel to the injectors, a pressure control or pressure limiting valve situated downstream of the high-pressure pump and by which the pressure to be produced in the fuel distributor can be adjusted or limited, and a pressure sensor for determining a pressure downstream of the high-pressure pump and upstream of the pressure control or pressure limiting valve, wherein the pressure sensor, the pressure control or pressure limiting valve and the fuel distributor are formed in a high-pressure module, and the high-pressure module is formed as a structural unit with the high-pressure pump.

Abstract: A fuel injection system for an internal combustion engine has a fuel distributor (2), in the interior space (4) of which is formed a high-pressure accumulator, wherein transverse bores (6) open into the interior space (4). The transverse bores (6) are connected by connecting pipes (8a, 8b) to pressure lines (10) for the supply and discharge of fuel. A high-pressure sensor (30) is arranged at the face-side end of the fuel distributor (2), which high-pressure sensor (30) is connected by a measurement bore (30c) to the interior space (4), and a permanent magnet ring is arranged at that face-side end of the interior space (4) which is assigned to the high-pressure sensor (3).

Abstract: An injection system for an internal combustion engine has at least one injector (18) which is coupled hydraulically to a fuel accumulator (16), a prefeed pump (12) for feeding fuel from a fuel tank (10), a high pressure pump (14) which is arranged downstream behind the prefeed pump (12) for feeding the fuel into the fuel accumulator (16), and a line (42) which branches off downstream of the prefeed pump (12) and upstream of the high pressure pump (14) and is coupled hydraulically to an exhaust section injector (47), by way of which fuel can be injected into an exhaust section of the internal combustion engine.

Abstract: In a method and a device for the volume flow control of an injection system, a seat valve (3) is used for the volume flow control. For this purpose, the influence of the pressure present upstream of the seat valve (3) is taken into consideration in the volume flow control.

Abstract: In a device for generating electrical energy in a motor vehicle and a motor vehicle with such a device, a microturbine 30; 60; 80 is connected to energy-conducting systems of the motor vehicle 1, for example the high-pressure injection system 20, the hydraulic system 70 or the compressed air system 50, in order to utilize the energy which is to be output to the surroundings and to convert it into electrical energy.

Abstract: A fuel injection system has a high-pressure fuel reservoir with at least one fuel feed and at least one fuel discharge, wherein the fuel feed interacts with a high-pressure fuel pump and the fuel discharge interacts with a fuel injection valve. Arranged in the fuel discharge and/or fuel feed of the high-pressure fuel reservoir is a gap filter which is configured geometrically in such a way that it achieves a predetermined throttle effect. The use of the gap filter in the fuel discharge and/or in the fuel feed prevents dirt particles from being able to get into the injector and cause malfunctions there. Furthermore, pressure vibrations which are induced in the system as a result of the injection process or as a result of the high-pressure fuel pump are damped by the throttle effect of the gap filter.

Abstract: An injection system for an internal combustion engine has at least one injector (18) which is coupled hydraulically to a fuel accumulator (16), a prefeed pump (12) for feeding fuel from a fuel tank (10), a high pressure pump (14) which is arranged downstream behind the prefeed pump (12) for feeding the fuel into the fuel accumulator (16), and a line (42) which branches off downstream of the prefeed pump (12) and upstream of the high pressure pump (14) and is coupled hydraulically to an exhaust section injector (47), by way of which fuel can be injected into an exhaust section of the internal combustion engine.

Abstract: A method for approximating a stored pilot control map of a pressure control valve of a common-rail pump to the effective of pilot control map of the pressure control valve is presented. The stored pilot control map forms a desired pressure in the rail on a control current of the pressure control valve. The method includes the following method steps a) measurement of the pressure in the rail; b) determination of the control current of the pressure control valve; and c) adaptation of the stored pilot control map by a regression process that includes the pressure measured in step a) and control current measured in step b). In the course of a test run lasting 120 seconds (s) the control deviations (dp) of the desired pressure from the actual pressure in the pressure control valve could be substantially reduced.

Abstract: A method for approximating a stored pilot control map of a pressure control valve of a common-rail pump to the effective of pilot control map of the pressure control valve is presented. The stored pilot control map forms a desired pressure in the rail on a control current of the pressure control valve. The method includes the following method steps a) measurement of the pressure in the rail; b) determination of the control current of the pressure control valve; and c) adaptation of the stored pilot control map by a regression process that includes the pressure measured in step a) and control current measured in step b). In the course of a test run lasting 120 seconds (s) the control deviations (dp) of the desired pressure from the actual pressure in the pressure control valve could be substantially reduced.

Abstract: In a method and a device for the hydro-erosive rounding of an edge of a component, in particular, an edge in a channel of a high-pressure resistant component, a fluid charged with abrasive bodies is run along the edge for rounding and the flow speed in the vicinity of the edge for rounding is increased by means of a body arranged in the fluid flow path. With relation to the method, the flow speed of the fluid (6) is increasingly raised along the course of the body (7) until the edge (5) for rounding is reached by means of the geometry of the body (7) and, with relation to the device, the cross-sectional area of the flow channel (10) continuously declines in the direction of flow (S) of the fluid (6) along the length of the body (7) at least as far as the edge (5).