Abstract: An electrically driven solenoid coupled to a spring-operated valve, regulates pressure in an accumulator by opening when a predefined threshold pressure in a pressure accumulator is exceeded. The solenoid provides an assistive force to a spring-closed valve, reducing the amount of pressure required to open the valve responsive to the amount of current provided to the solenoid. The threshold pressure at which the valve opens is thus determined by the amount of current provided to the solenoid. Increasing the current decreases the threshold pressure; decreasing the current increases the threshold pressure.

Abstract: The present disclosure relates to the field of electromechanics. The teachings may be applied to high-pressure valves, including methods for operating a valve and with devices which are used for activating the valves. Some embodiments include methods for operating a pressure reduction valve for an accumulator injection system, wherein the valve is driven, against a return spring, with an energizable coil and armature, between a closed position and an open position. The method may include: supplying the coil with a defined electrical signal to move the armature, sensing the current intensity profile over time, and determining a movement profile for the defined current signal, including an opening or closing time, based at least in part on the current intensity profile over time.

Abstract: An injection device for an internal combustion engine includes a fuel delivery pump and a high-pressure pump which are connected to one another via a low-pressure fuel line. A high-pressure accumulator is connected to the high-pressure pump. At least one injector is connected via a high-pressure fuel line to the high-pressure accumulator. The injection device also has at least one fuel return line which is connected to the high-pressure accumulator and/or to the at least one injector. The fuel return line issues into the low-pressure fuel line which connects the fuel delivery pump and the high-pressure pump to one another. At least one air bleed valve is arranged in the course of the low-pressure fuel line or on the high-pressure pump or on a filter housing.

Abstract: A method and to a device for operating a pressure reservoir, where during a compression phase in a pump chamber, a pump periodically increases the pressure of a fluid located therein, and by means of a discharge valve controlled by differential pressure fluid under high pressure is allowed to be introduced from the pump chamber into the pressure reservoir. During a decompression phase following a compression phase, fluid from a fluid reservoir is introduced into the pump chamber by means of a controllable intake valve. In order to be able also to operate the pressure reservoir without a high pressure measurement directly in the pressure reservoir, the fluid pressure in the pressure reservoir is ascertained by means of a pressure determination in the pump chamber. The pressure determination takes place indirectly, monitoring of the intake valve in the decompression phase.

Abstract: A method and to a device for operating a pressure reservoir, where during a compression phase in a pump chamber, a pump periodically increases the pressure of a fluid located therein, and by means of a discharge valve controlled by differential pressure fluid under high pressure is allowed to be introduced from the pump chamber into the pressure reservoir. During a decompression phase following a compression phase, fluid from a fluid reservoir is introduced into the pump chamber by means of a controllable intake valve. In order to be able also to operate the pressure reservoir without a high pressure measurement directly in the pressure reservoir, the fluid pressure in the pressure reservoir is ascertained by means of a pressure determination in the pump chamber. The pressure determination takes place indirectly, monitoring of the intake valve in the decompression phase.

Abstract: An electrically driven solenoid coupled to a spring-operated valve, regulates pressure in an accumulator by opening when a predefined threshold pressure in a pressure accumulator is exceeded. The solenoid provides an assistive force to a spring-closed valve, reducing the amount of pressure required to open the valve responsive to the amount of current provided to the solenoid. The threshold pressure at which the valve opens is thus determined by the amount of current provided to the solenoid. Increasing the current decreases the threshold pressure; decreasing the current increases the threshold pressure.

Abstract: The present disclosure relates to the field of electromechanics. The teachings may be applied to high-pressure valves, including methods for operating a valve and with devices which are used for activating the valves. Some embodiments include methods for operating a pressure reduction valve for an accumulator injection system, wherein the valve is driven, against a return spring, with an energizable coil and armature, between a closed position and an open position. The method may include: supplying the coil with a defined electrical signal to move the armature, sensing the current intensity profile over time, and determining a movement profile for the defined current signal, including an opening or closing time, based at least in part on the current intensity profile over time.

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: An injection device for an internal combustion engine includes a fuel delivery pump and a high-pressure pump which are connected to one another via a low-pressure fuel line. A high-pressure accumulator is connected to the high-pressure pump. At least one injector is connected via a high-pressure fuel line to the high-pressure accumulator. The injection device also has at least one fuel return line which is connected to the high-pressure accumulator and/or to the at least one injector. The fuel return line issues into the low-pressure fuel line which connects the fuel delivery pump and the high-pressure pump to one another. At least one air bleed valve is arranged in the course of the low-pressure fuel line or on the high-pressure pump or on a filter housing.

Abstract: For a pressure relief device of an injection system of an internal combustion engine, for an injection system of an internal combustion engine having a pressure relief device and in a pressure relief method of an injection system of an internal combustion engine, a defined fuel pressure of the injection system is reduced to a defined fuel residual pressure upon exceeding a pressure limit above a defined fuel pressure, permitting emergency operation of the internal combustion engine.

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 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: For a pressure relief device of an injection system of an internal combustion engine, for an injection system of an internal combustion engine having a pressure relief device and in a pressure relief method of an injection system of an internal combustion engine, a defined fuel pressure of the injection system is reduced to a defined fuel residual pressure upon exceeding a pressure limit above a defined fuel pressure, permitting emergency operation of the internal combustion engine.

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.