Robert Boschgmbh

Joerg Kuempel

Matthias Maess

Rainer Wilms

Uwe Richter

Matthias Schumacher

Klaus Joos

Alexander Schenck Zu Schweinsberg

Timm Hollmann

Michael Bauer

Hans-Friedrich Schwarz

Burkhard Hiller

Werner Hess

Thomas Frenz

Bernd Schroeder

Juergen Eckhardt

Christian Wiedmann

Heiko Roth

Peter Roth

Gerhard Haaf

Rainer Winkler

A method is described for operating an electric fuel pump constituting a low-pressure pump in a fuel supply system for an internal combustion engine, having a high-pressure reservoir and a high-pressure pump, of a motor vehicle. The electric fuel pump is operated at least temporarily, during a time period during which the internal combustion engine is switched off during operation of the motor vehicle, with a minimum value for a control application variable for the electric fuel pump.

Method for operating an electric fuel pump

A method for ascertaining a setpoint value for a manipulated variable for activating a low-pressure pump in a fuel supply system for an internal combustion engine, including a high-pressure accumulator and a high-pressure pump including a volume control valve, the low-pressure pump being activated in such a way that a pressure provided by the low-pressure pump is reduced across multiple intake phases, in which fuel delivered by the low-pressure pump is sucked in by the high-pressure pump via the volume control valve, the volume control valve being at least temporarily held in a closed position during each of the multiple intake phases, in which it may be opened from a side facing the low-pressure pump, and the setpoint value being ascertained, taking into account an activating value of the manipulated variable, in which a drop in the delivery rate of the high-pressure pump is detected.

Method for ascertaining a setpoint value for a manipulated variable for activating a low-pressure pump

A method for ascertaining a setpoint value for a manipulated variable for the actuation of a low-pressure pump in a fuel-supply system for an internal combustion engine having a high-pressure accumulator and a high-pressure pump, the high-pressure pump being operated in a full delivery mode, and the low-pressure pump being actuated so that a pressure provided by the low-pressure pump is reduced, and the setpoint value at which a dip in a delivery quantity of the high-pressure pump is detected is ascertained while taking into account an actuation value of the manipulated variable.

Method for ascertaining a setpoint value for a manipulated variable for actuating a low-pressure pump

A method for operating a fuel delivery device of an internal combustion engine includes switching an electromagnetic actuating device of a volume control valve so as to set a delivery volume. An intensity of an energy that is supplied to the electromagnetic actuating device for switching purposes, in particular of a current supplied to the electromagnetic actuating device and/or a level of a voltage applied to the electromagnetic actuating device, depends at least intermittently on a rotational speed of the internal combustion engine.

Method and device for operating a fuel delivery device of an internal combustion engine

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

The disclosure relates to a method for operating a fuel delivery device of an internal combustion engine, in which method an electromagnetic actuating device of a volume control valve is switched such as to set a delivery volume, wherein a control of the electromagnetic actuating device for moving an armature of the electromagnetic actuating device from a first position to a second position comprises at least three phases, wherein in a first phase a coil of the electromagnetic actuating device is permanently connected to a voltage, and wherein in a second phase the coil is periodically connected to the voltage with a first frequency and with a first duty factor, and wherein in a third phase the coil is periodically connected to the voltage with a second frequency and with a second duty factor.

Method for operating a fuel delivery device

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 method for regulating a fuel injection system of an internal combustion engine, wherein the fuel injection system includes a high-pressure pump which is associated with a quantity control valve having a solenoid valve electromagnetically operable by a coil for supplying fuel, the quantity control valve regulating the fuel quantity pumped by the high pressure pump and the coil of the solenoid valve being energized according to a setpoint current value in order to close the valve for supplying fuel to the high-pressure pump; when the solenoid valve closes, the setpoint current value is reduced from a first current setpoint value to a second current setpoint value so that an emission of audible noise generated when the solenoid valve closes during operation of the internal combustion engine is at least partially reduced.

Method for regulating a quantity control solenoid valve in an internal combustion engine

A method for controlling a fuel injection system () of an internal combustion engine. Including a high-pressure pump () associated with a quantity controlling valve () having a solenoid valve () electromagnetically actuatable by a coil () for supplying fuel, the quantity control valve () controlling the quantity of fuel supplied by the high-pressure pump () and the coil () of the solenoid valve () having a first current value applied thereto, in order to close the same for supplying fuel to the high-pressure pump (), the first current value being reduced to a second current value when the solenoid valve is closing (), such that the radiation of audible sound arising from the closing of the solenoid valve () is at least partially reduced.

Method for controlling a solenoid valve of a quantity controller in an internal combustion engine

A method for operating an inductive load, which is operated in a motor vehicle with electric voltages of different magnitudes, is provided, a current rise in the inductive load being influenced by selecting pulse lengths and pulse pauses of the electric voltage.

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Ludwigsburg, Germany

Joerg Kuempel