Robert Boschgmbh

Rainer Wilms

Matthias Maess

Joerg Kuempel

Matthias Schumacher

Uwe Richter

Heinz Siegel

Peter Ropertz

Klaus Lang

Siamend Flo

Berthold Pfuhl

Dominik Brunner

Volkmar Goldschmitt

Joachim Zumbraegel

Martin Laich

Victorio Toscano

Hans-Werner Schlingensief

A quantity control valve comprises a valve needle configured to move in an axial direction, a damping chamber having a wall, and a valve element delimiting the damping chamber. The valve needle is configured to move the valve element in an opening direction. A gap is defined between the wall of the damping chamber and the valve element. The gap has at least one recess and connects the damping chamber to a flow duct.

Quantity control valve and high-pressure pump with quantity control valve

In a fuel system of an internal combustion engine, fuel is delivered by a high-pressure pump into a fuel rail. The quantity of the delivered fuel is influenced by a quantity control valve () actuated by an electromagnetic actuating device. A limit-value retaining current is ascertained, at which the quantity control valve still remains in its closed state or is just opening.

Method and device for controlling a quantity control valve

In a method for actuating a switch element of a valve device between a first end position and a second end position, in a normal mode within a cycle following an end of a first energization, a movement of the switch element in a first direction effected by the loading device is retarded in a first direction by a brief second energization ('braking pulse') that is introduced within the cycle once a pause period has ended following a characteristic point in time. It is provided that the optimum pause period and/or the optimum variable characterizing the braking pulse be ascertained in an adaptation mode.

Method for actuating a switch element of a valve device

A method for operating a fuel system for an internal combustion engine having a metering device, an electrical actuating device, and a valve element includes: activating the electrical actuating device in at least one first cycle in such a way that the valve element switches into a second position corresponding to an open metering device; activating the electrical actuating device in at least one second cycle in such a way that the electrical actuating device is activated from activation to activation, with activation energy which decreases gradually, until a limiting case is reached in which the valve element only just or just no longer switches into the second position; ascertaining a first activation energy, which corresponds to the limiting case; and subsequently activating the actuating device, taking the first activation energy into account.

Method for operating a fuel system for an internal combustion engine

In a fuel injection system of an internal combustion engine fuel is delivered into a fuel rail by a high-pressure pump. The quantity of the delivered fuel is influenced by a quantity control valve operated by an electromagnetic operating device. At least one parameter of a braking pulse of the electromagnetic actuating device depends on an efficiency of the electromagnetic actuating device and/or on a supply voltage of a voltage source and/or on a temperature, in particular of a component of the fuel injection system or of the internal combustion engine.

Method for operating a fuel injection system of an internal combustion engine

In a fuel injection system of an internal combustion engine, fuel is delivered from a high-pressure pump into a fuel rail. The quantity of the delivered fuel is influenced by a quantity control valve which is activated by an electromagnetic actuating device. The level of control of the quantity control valve during the transition from the closed state to the open state of the quantity control valve is provided in the form of a sufficiently flat, descending progression which allows a robust control of the opening motion with regard to the varying specimen properties.

In a method for controlling a quantity control valve, at least two parameters characterizing the quantity control valve are utilized. A control signal supplied to the quantity control valve is defined by the at least two parameters. At least one parameter is ascertained based on the result of a first adaptation and a second adaptation, or based on the result of a first adaptation and the other parameter.

A fuel injection system of an internal combustion engine delivers fuel into a fuel rail via a high-pressure pump. The quantity of the delivered fuel is influenced by a quantity control valve operated by an electromagnetic operating device. A trigger signal supplied to the electromagnetic operating device is defined by at least two parameters, and a) in an adaptation method with the second parameter defined, at least one first parameter of the trigger signal supplied to the electromagnetic operating device is varied successively up to a final value at which a closing or opening of the quantity control valve is at least indirectly no longer or just barely detected, b) the first parameter is subsequently defined at least temporarily based on the final value, and c) the temporarily defined first parameter is adapted based on at least one prevailing operating variable of the fuel injection system or the second parameter is adapted based on at least one prevailing operating variable of the fuel injection system and of the temporarily defined first parameter.

A high pressure fuel pump encompasses at least one delivery chamber and one high pressure outlet. in addition, a pressure limiting valve with a valve that is actuated by a pressure differential is provided that can open from the high pressure outlet to the delivery chamber. On a high pressure side of a valve seat of the pressure limiting valve, it is advantageous that a throttle device is provided, whose free cross section is at most approximately equal to a desired maximum opening cross section of the pressure limiting valve.

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Markgroeningen, Germany

Rainer Wilms