Abstract: 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.

Abstract: A method and a device for operating a drive unit of a vehicle are provided, which result in reduced fuel consumption in the overrun condition. An output variable of the drive unit is set, in this context, according to a preset driving strategy in the overrun condition of the drive unit. At least two preset driving strategies are specified for the overrun condition of the drive unit. In the overrun condition, one of the specified driving strategies is selected as a function of a driving situation.

Abstract: A method for operating an internal combustion engine having a fuel pump with a drive shaft is provided, the fuel pump conveying fuel into at least one fuel-collection line, the fuel being subsequently conveyed to at least one combustion chamber via at least one fuel-injection device. In the method, a quantity of the fuel conveyed by the fuel pump into the fuel-collection line is set by means of a valve device. The valve device is configured to selectively connect a discharge side of the fuel pump to a low-pressure region of the fuel pump (during deactivation phase), and selectively disconnect the discharge side from the low-pressure region (during supply phase). In supplying the quantity of fuel, a supply rate, defined as the number of supply phases of the fuel pump per rotation of the drive shaft, is determined as a function of at least one operating parameter of the internal combustion engine.

Abstract: A method and a device for operating a drive unit of a vehicle are provided, which result in reduced fuel consumption in the overrun condition. An output variable of the drive unit is set, in this context, according to a preset driving strategy in the overrun condition of the drive unit. At least two preset driving strategies are specified for the overrun condition of the drive unit. In the overrun condition, one of the specified driving strategies is selected as a function of a driving situation.

Abstract: A method for operating a fuel metering system of a motor vehicle is provided, in which fuel is delivered by at least one supply pump to at least one high pressure area, the fuel being injected by at least one fuel injector from the high pressure area directly into at least one combustion chamber, at least one sensor detecting the pressure in the high pressure area, and at least one pressure regulating element being provided for adjusting the pressure in the high pressure area.

Abstract: An internal combustion engine is operated according to a method, in which the fuel is pumped from a first fuel pump to a second fuel pump and from there into a high-pressure region. The fuel passes therefrom into at least one combustion chamber of the internal combustion engine, by means of at least one fuel injection device. In certain operating conditions of the internal combustion engine, the pressure in the high-pressure region is lowered by means of a release device. According to the invention, the reliability and security of operating the internal combustion engine may be increased by monitoring the functioning of the release device (58 through 68).

Abstract: A method for operating a fuel-supply system for an internal combustion engine of a motor vehicle is provided, the fuel-supply system having a fuel-storage tank, a fuel pump and a pressure sensor, the fuel pump supplying fuel from the fuel-storage tank to a pressure region, the pressure sensor being arranged in the pressure region, and the pressure sensor generating a signal representing the pressure in the pressure region.

Abstract: A method for operating an internal combustion engine, in particular of a motor vehicle including at least one fuel pump delivers the fuel from a fuel tank into a fuel line. The pressure of the fuel, at least in a region of the fuel line, is increased as a function of an operating state. In order to assure a reliable starting of the engine, the pressure of the fuel, at least In the above-mentioned region of the fuel line is at least intermittently increased when the engine is not running.

Abstract: In an internal combustion engine, the fuel is conveyed by an electrically driven fuel pump. The intake side of this pump is connected to a fuel tank and its outlet side is connected to a pressure region. A prerun of the electrically driven fuel pump may be performed before the startup of the internal combustion engine. In order to increase the service life of the fuel pump, an actual pressure (pactual) in the pressure region may be detected by a pressure sensor and the execution of the prerun be a function of at least the signal of the pressure sensor.

Abstract: Method for operating an internal combustion engine in which fuel is injected into a combustion chamber by an injector. The injector has a drivable piezo-actuator. A setpoint value is generated for driving the piezo-actuator. A setpoint charge quantity (QCsetpoint) is determined from the setpoint value, and an actual charge quantity (QCactual) supplied to the piezo-actuator is determined. The setpoint charge quantity (QCsetpoint) and the actual charge quantity (QCactual) are combined, and the combined result (Son) acts upon the drive circuit of the piezo-actuator.

Abstract: In an internal combustion engine, the fuel reaches the combustion chamber of the engine via a fuel-injection device which includes a piezo actuator (50). In order to be able to optimally inject the fuel, it is suggested that the desired level (U_DES) of the drive energy (U) and/or the desired gradient (dU_DES) of the drive energy (U), with which the piezo actuator (50) is driven, is dependent upon a plurality of influence quantities (T, t, n, dx, dh) which influence the operating behavior of the piezo actuator (50).

Abstract: A method for operating an internal combustion engine is described, in which fuel is injected by an injector into a combustion chamber. The injector has an activatable piezoactuator. In the method, a precontrol setpoint for activating the piezoactuator is generated. The precontrol setpoint is combined with a charge regulation of the charge quantity conveyed to the piezoactuator.

Abstract: A method for operating a fuel metering system of a motor vehicle is provided, in which fuel is delivered by at least one supply pump to at least one high pressure area, the fuel being injected by at least one fuel injector from the high pressure area directly into at least one combustion chamber, at least one sensor detecting the pressure in the high pressure area, and at least one pressure regulating element being provided for adjusting the pressure in the high pressure area.

Abstract: A fuel supply system (2) for an internal combustion engine (1) for, in particular, a motor vehicle. The fuel supply system (2) is used for delivering fuel from a fuel tank (3) into at least one intake manifold (4) or at least one combustion chamber (5) of the internal combustion engine (1) and includes at least two fuel pumps (6, 8; 11) connected in series. In order to ensure that the internal combustion engine (1) is supplied with fuel at any operating point of the internal combustion engine (1), it is provided that at least two of the fuel pumps (6, 8; 11) of the fuel supply system (2) take the form of electric fuel pumps (6, 8). The second electric fuel pump (8) in the direction of flow is preferably adjusted to a separate, variable pressure level in a demand-responsive manner, so that the pressure and fuel quantity are controlled.

Abstract: In an internal combustion engine, the fuel enters at least one combustion chamber of the internal combustion engine via at least one fuel injection device. A piezoelectric actuator moves a valve element of the fuel injection device. The function of the piezoelectric actuator is monitored and a malfunction is detected. To minimize the risk of damage to the internal combustion engine in the event of a malfunction of the piezoelectric actuator, the fuel mass flow to the fuel injection device is reduced if a malfunction of the piezoelectric actuator is detected.

Abstract: A method and a device are provided for operating a vehicle having a combustion engine, which result in reduced fuel consumption in overrun operation. In the process, the air supply to the combustion engine is adjusted via an actuator. In overrun operation of the combustion engine, an opening degree of the actuator is set as a function of a driving situation.

Abstract: 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.

Abstract: The invention relates to a method and an arrangement for diagnosing a fuel supply system of an internal combustion engine. In order to make possible a differentiation of the fault with respect to individual components of the fuel supply system, a method is suggested which is characterized by the following steps: recording the trace of the fuel pressure in the fuel supply system (2); forming the frequency spectrum of the fuel supply trace (3); and, analyzing the frequency spectrum (4). The analysis of the frequency spectrum preferably includes the following steps: comparing the trace of the recorded frequency spectrum to the trace of the frequency spectrum of a fault-free operating fuel supply system at this operating point; and, in the event that deviations between the traces of the frequency spectra are present, classifying the deviations in accordance with the nature of the faults in the fuel supply system via which the deviations are caused.

Abstract: The invention is directed to a method for operating an internal combustion engine (1) wherein a fault of a pressure system with a pressure sensor (14) is determined by a first diagnostic system (14?) of the engine (1). The pressure sensor (14) is especially a pressure sensor of a high pressure fuel system of the engine. For a plausibility consideration of a pressure system fault, which is determined by the first diagnostic system (14?), at least one further diagnostic system (18?) of the engine (1) is checked as to a second fault.

Abstract: In an internal combustion engine, the fuel enters at least one combustion chamber of the internal combustion engine via at least one fuel injection device. A piezoelectric actuator moves a valve element of the fuel injection device The function of the piezoelectric actuator is monitored and a malfunction is detected. To minimize the risk of damage to the internal combustion engine in the event of a malfunction of the piezoelectric actuator, the fuel mass flow to the fuel injection device is reduced if a malfunction of the piezoelectric actuator is detected.