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: A first method is for determining a variable, which characterizes a fuel injection, in an internal combustion engine of a motor vehicle in a hot-start situation wherein fuel is injected directly into at least one combustion chamber from a high-pressure region of a fuel supply system; the variable, which characterizes the injection quantity, is corrected at least in dependence upon a variable which represents a temperature of the fuel. A second method is for determining a hot-start situation in an internal combustion engine of a motor vehicle wherein a hot-start situation is determined at least based on a variable, which represents a temperature of the fuel, and based on a fuel pressure. The invention relates likewise to corresponding arrangements, a corresponding control apparatus for an internal combustion engine, a corresponding computer program having program-code means and a corresponding computer program product having program-code means.

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: A method of determining a camshaft position. The method comprises determining temperatures, measuring camshaft deviations, and determining a camshaft deviation gradient. Embodiments of the invention may also take the form of a camshaft position temperature compensation system having a memory, a gradient processing module, a temperature sensor, a camshaft position sensor, and an approximation module.

Abstract: A method of determining a camshaft position. The method comprises determining temperatures, measuring camshaft deviations, and determining a camshaft deviation gradient. Embodiments of the invention may also take the form of a camshaft position temperature compensation system having a memory, a gradient processing module, a temperature sensor, a camshaft position sensor, and an approximation module.

Abstract: A fuel delivery system for an internal combustion engine, having a fuel feed pump, which delivers fuel which is at pilot pressure to a high-pressure fuel pump that communicates on the high-pressure side with at least one injection valve, in order to deliver fuel at high pressure to the injection valve or valves. To prevent vapor bubble development in the high-pressure fuel pump, which impairs its pumping capacity and pressure generation, a coolant medium flow can be delivered to the high-pressure fuel pump via at least one coolant conduit, in order to keep the temperature (THDP) of the high-pressure fuel pump below a critical operating temperature (Tk1).

Abstract: The invention relates to a method and an arrangement for calibrating a pressure sensor (7) of a fuel-metering system of an internal combustion engine wherein the fuel-metering system includes: a high-pressure pump (2) for pumping fuel from a low-pressure region (ND) into a high-pressure region (HD) injectors (5) for metering the fuel from the high-pressure region (HD) into combustion chambers (6) of the internal combustion engine with the injectors (5) being drivable in dependence upon operating characteristic variables, and the pressure sensor (7) for measuring the pressure in the high-pressure region (HD).

Abstract: An injection system for internal combustion engines is proposed, in which once the engine has been turned off, a pressure equalization is established between the intake side and the pressure side of the high-pressure fuel pump. This prevents uncombusted fuel from reaching the combustion chambers of the engine. The pressure prevailing on the pressure side and the intake side when the engine is off furthermore assures that vapor bubbles cannot form, and this makes starting the engine easier.

Abstract: A method for operating an internal combustion engine, e.g., of a motor vehicle, where fuel is supplied under pressure via at least one injection valve. The injected fuel quantity is influenced by the injection time of injection valve. In order to be able to provide optimum operating comfort and good component reliability even in the event of an incorrect fuel pressure, a maximum allowable torque of the internal combustion engine that is dependent on the instantaneous fuel pressure is determined.

Abstract: A method is provided for operating a spark ignition internal combustion engine having fuel injection at a cold start. The method retards the spark angle to a cold start value at least for the first combustion in at least one cylinder of the internal combustion engine during a cold start phase, the fuel injected into the cylinder being brought to combustion, and the method sets the spark angle to normal, to end the cold start phase.

Abstract: A first method for determining a variable, which characterizes a fuel injection, in an internal combustion engine of a motor vehicle in a hot-start situation wherein fuel is injected directly into at least one combustion chamber from a high-pressure region of a fuel supply system; the variable, which characterizes the injection quantity, is corrected at least in dependence upon a variable, which represents a temperature of the fuel. A second method is for determining a hot-start situation in an internal combustion engine of a motor vehicle wherein a hot-start situation is determined at least based on a variable, which represents a temperature of the fuel, and based on a fuel pressure. The invention relates likewise to corresponding arrangements, a corresponding control apparatus for an internal combustion engine, a corresponding computer program having program-code means and a corresponding computer program product having program-code means.

Abstract: Method for varying a prepressure (p_des) generated by a low-pressure pump and applied to a high-pressure pump with the low-pressure pump (2) and the high-pressure pump (3) pumping fuel for the internal combustion engine (1). In order to keep the prepressure (p_des), on the one hand, as low as possible to take load off the low-pressure pump (2) and to, on the other hand, adjust the prepressure (p_des) so high that a vaporization of the fuel is reliably avoided, the invention suggests that: the actual temperature (T_Krst) of the fuel in the high-pressure pump (3) is determined; a prepressure (p_des) as low as possible is determined in dependence upon the fuel temperature (T_Krst) for which a vaporization of the fuel in the high-pressure pump (3) is reliably avoided; and, the low-pressure pump (2) is so driven or controlled that it generates the determined prepressure (p_des). The method is preferably carried out on the basis of physical models of the high-pressure pump (3).

Abstract: A method and system of controlling a vacuum-driven actuator in a vehicle. The method includes determining an amount of vacuum available to actuate the actuator, determining whether the available vacuum is sufficient to actuate the actuator, actuating the actuator only when the available vacuum is sufficient, and preventing actuation of the actuator when the available vacuum is insufficient.

Abstract: An internal combustion engine (1), especially for a motor vehicle, is described. The engine has an injection valve (8) with which fuel can be injected directly into the combustion chamber (4) delimited by the piston (2) in a first operating mode during a compression phase and in a second operating mode during an induction phase. In addition, the engine (1) has a spark plug (9) with which the fuel, which is injected into the combustion chamber (4), can be ignited. A control apparatus (16) is provided, with which the injection valve (8) and the spark plug (9) are controllable. The injection of the fuel in each operating state of the engine (1) is ended by the control apparatus (16) in advance of the ignition of the fuel.

Abstract: The invention relates to a method for reducing the fuel pressure in a return-free fuel supply system of an internal combustion engine to a desired pressure value. At least one fuel pump is mounted in the fuel supply system. In order to be able to reduce the fuel pressure in the fuel supply system in a simple manner without additional pressure release valves, the suggestion is made that the fuel supply system and the internal combustion engine be operated in a pressure-reduction mode wherein at least one fuel pump of the fuel supply system is so controlled (open loop and/or closed loop) that the desired pressure value is adjusted in the fuel supply system. The fuel supply system is preferably configured as a common-rail storage injection system for a direct-injecting internal combustion engine.

Abstract: A method and system of controlling a vacuum-driven actuator in a vehicle. The method includes determining an amount of vacuum available to actuate the actuator, determining whether the available vacuum is sufficient to actuate the actuator, actuating the actuator only when the available vacuum is sufficient, and preventing actuation of the actuator when the available vacuum is insufficient.

Abstract: A method for cooling a fuel injection system and fuel injection systems are proposed that improve the hot-starting performance of the internal combustion engine.

Abstract: An injection system for internal combustion engines is proposed, in which once the engine has been turned off, a pressure equalization is established between the intake side and the pressure side of the high-pressure fuel pump. This prevents uncombusted fuel from reaching the combustion chambers of the engine. The pressure prevailing on the pressure side and the intake side when the engine is off furthermore assures that vapor bubbles cannot form, and this makes starting the engine easier.

Abstract: A method is provided for operating a spark ignition internal combustion engine having fuel injection at a cold start. The method retards the spark angle to a cold start value at least for the first combustion in at least one cylinder of the internal combustion engine during a cold start phase, the fuel injected into the cylinder being brought to combustion, and the method sets the spark angle to normal, to end the cold start phase.

Abstract: The invention relates to a method and an arrangement for calibrating a pressure sensor (7) of a fuel-metering system of an internal combustion engine wherein the fuel-metering system includes: a high-pressure pump (2) for pumping fuel from a low-pressure region (ND) into a high-pressure region (HD) injectors (5) for metering the fuel from the high-pressure region (HD) into combustion chambers (6) of the internal combustion engine with the injectors (5) being drivable in dependence upon operating characteristic variables, and the pressure sensor (7) for measuring the pressure in the high-pressure region (HD).