Continental Automotive Gmbh

Vitesco Technologies Gmbh

Cpt Group Gmbh

Tobias Ritsch

Christoph Klesse

Hans Riepl

Michael Wirkowski

Thomas Kraft

Daniel Anetsberger

Uwe Lingener

Claus Stephani

Oliver Seegmüller

Erwin Achleitner

Heiko Zabich

Thomas Riedel

Wolfgang Stapf

Thomas Uliana

Matthias Bauer

Robert Wiench

Disclosed is a method and a device for predicting the failure time of the pressure limiting valve of a high-pressure fuel pump of a motor vehicle. The method includes measuring a characteristic parameter of the pressure limiting valve each time the motor vehicle has been switched off, determining and storing a variable determined by using the measured characteristic parameter, determining the time profile of the variable determined from the characteristic parameter, predicting the future profile of the variable determined from the characteristic parameter, and comparing the predicted future profile of the variable determined from the characteristic parameter with a predetermined wear limiting value. The comparison is to predict the time at which the predicted future profile of the variable determined from the characteristic parameter reaches the predetermined wear limiting value.

Method and device for predicting the failure time of the pressure limiting valve of a high-pressure fuel pump of a motor vehicle

A method operates a fuel-supply system for an internal combustion engine. The fuel-supply system contains a high-pressure fuel pump, a high-pressure fluid accumulator having a fuel-injection valve, and a high-pressure sensor. A measurement signal of the sensor is representative of a pressure within the high-pressure fluid accumulator. The high-pressure fuel pump is fluidically connected on the outlet side to the high-pressure fluid accumulator. A respective maximum injection quantity of the fuel-injection valve is determined depending on the measurement signal of the high-pressure sensor. The injection quantity is determined depending on an efficiency characteristic representing the efficiency of the high-pressure fuel pump, the efficiency characteristic depending on the measurement signal of the high-pressure sensor. The at least one fuel-injection valve is actuated in such a way that a respective injection quantity to be metered by the at least one fuel-injection valve is limited to the respective maximum injection quantity.

Method of operating a fuel-supply system for an internal combustion engine

A method according to the invention for checking the plausibility of the function of a pressure sensor in an injection system of an internal combustion engine includes acquiring a calibrated actuation profile, by which peak current values for opening at least one electrically actuatable injection valve are assigned to existing internal pressures. An existing internal pressure is measured in the form of an actual sensor pressure value by the pressure sensor. The method includes obtaining the electrical peak current value corresponding to the measured sensor pressure value from a calibrated actuation profile, such that the corresponding electrical peak current value acquired in this way is applied to the injection valve. Subsequently, an opening state of the injection valve is monitored in reaction to the applied electrical peak current value, and a functional state of the pressure sensor is assigned as a function of the opening state of the injection valve.

Method for checking the plausibility of the function of a pressure sensor

A method for operating an internal combustion engine having a high-pressure fuel injection system stops and starts the engine independently of an intervention by the motor vehicle operator and then restarted. A high-pressure fuel pump is used to pump fuel to a high-pressure reservoir to which at least one high-pressure fuel injector is connected in order to inject fuel into the at least one cylinder of the internal combustion engine. Fuel pressure can be adjusted on the high-pressure side using an electrically actuated pressure reduction valve (PDV).

Method and device for operating an internal combustion engine comprising a high-pressure fuel injection system

Embodiments relate to an operating method for operating a fuel injection system of an internal combustion engine, wherein, upon a detection of a fault in the fuel injection system, and wherein a predefined pressure is overshot in a high-pressure region of the fuel injection system, an overrun mode of the internal combustion engine is deactivated, such that the internal combustion engine is operated exclusively in an injection mode.

Operating method for operating a fuel injection system and fuel injection system

The disclosure relates to a control method for controlling at least one injector valve in a fuel injection system of an internal combustion engine. An opening time of the injector valve is selected such that, in a fault situation in the fuel injection system, an opening time of the injector valve is situated in a pressure valley of a pressure oscillation prevailing in a high-pressure region of the fuel injection system.

Control method for controlling an injector valve in a fuel injection system, and fuel injection system

The invention relates to a control method for controlling a fuel injection system () of an internal combustion engine, wherein, wherein, in a fault situation of the fuel injection system (), a camshaft angle of a camshaft () which drives a pump piston () of a high-pressure fuel pump () of the fuel injection system () is adjusted such that an injection time (tI) of injector valve () which injects the fuel from the fuel injection system () into a combustion chamber of the internal combustion engine lies in a pressure trough () of a pressure oscillation in a high-pressure region ().

Control method for controlling a fuel injection system, and fuel injection system

The present invention relates to a method for operating a fuel supply system for an internal combustion engine, and to a corresponding device. The fuel supply system of an internal combustion engine may include: an outlet of a high-pressure pump coupled to a pressure-limiting valve and a high-pressure fluid accumulator. The method may include, when the internal combustion engine is set into a deactivated state, actuating the high-pressure pump such that, at the outlet side of the high-pressure pump, a pressure is increased such that the pressure-limiting valve is opened.

Fuel-supply system for an internal combustion engine

A pressure-limiting valve for a fuel injection system includes a housing having a fluid inlet and a fluid outlet, a sealing seat, and a sealing body configured to move between a closed position in which the sealing body is in contact with the sealing seat, which blocks fluid flow from the fluid inlet to the fluid outlet, and additional positions that permit such fluid flow, and a holding device for keeping the sealing body in one of the additional positions if the sealing body is moved at least a specified distance away from the sealing seat.

Pressure-limiting valve for a fuel injection system and fuel injection system

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.

Injection device for an internal combustion engine

An injection system for an internal combustion engine may include a high-pressure pump for delivering fuel at high pressure into a high-pressure region, wherein the high-pressure pump includes an inlet valve and an electrically switched, digitally actuated outlet valve. The outlet valve is designed as a normally-open outlet valve. In this way, it is possible to dispense with a pressure relief valve for the high-pressure region.

Injection system

A method for operating a fuel injection system of an internal combustion engine is disclosed. The fuel injection system comprises a high pressure accumulator (rail) and a high-pressure fuel pump with a digital inlet valve and which guides fuel into the high pressure accumulator. The number of the control pulses for the digital inlet valve and thus the number of the pump delivery strokes is reduced with respect to the number of the injection steps of an injector of the injection system, in order to thereby reduce the noise and the energy consumption of the high-pressure pump.

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

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.

Method and device for operating a high-pressure accumulator fuel injection system for an internal combustion engine

A valve includes a spring having a spring force, an actuator having an actuator force that acts against the spring force, and a tappet that can be actuated by means of the actuator. The valve also includes a sealing element, which is or can be coupled to the tappet, and a sealing seat, such that the valve is closed when the sealing element lies against the sealing seat. A current having a specified curve, proceeding from an initial value of the current to a specified final value of the current, is applied during a specified time interval of the actuator after a closing phase of the valve for a normally open valve or after an opening phase for a normally closed valve. The initial value of the current is less than the final value.

Method and device for controlling a valve

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.

Growing community of inventors

Wuppertal, Germany

Tobias Ritsch