Abstract: In a method for controlling a fuel injection system (10) of an internal combustion engine, wherein the fuel injection system (10) comprises a manifold (24) and a high-pressure pump (20) and a fuel dosing unit (16) is associated with the high-pressure pump (20), wherein the fuel dosing unit (16) controls the amount of fuel delivered, an amount of fuel required for the operation of the internal combustion engine is determined as a function of a correction factor, which is based on a fuel pressure at the inlet of the high-pressure pump (20) and/or on a vapor pressure of the fuel to be delivered.

Abstract: The aim of the invention is to optimize the running smoothness of an internal combustion engine. To achieve this aim, the individual cylinders are synchronized with respect to their torque contribution. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. Fuel is injected into the combustion chamber of the cylinder in a torque neutral manner by way of a secondary injection during a working stroke of the cylinder and the amount of fuel of the secondary injection us calculated in such a manner that the exhaust gas substantially corresponds to a stoichiometric air/fuel mixture.

Abstract: The invention deals with a method for the operation of an internal combustion engine with at least two cylinders, which can be operated with a fuel of variable quality stored in a tank and/or with fuel blends stored in the tank from a first and at least a second fuel in variable mixing ratios, and wherein variable fuel qualities and/or fuel blends of different compositions require variable air/fuel ratios for the achievement of a stable combustion and/or have a variable vaporization behavior.

Abstract: The invention relates to a procedure to heat up or keep warm an exhaust gas emission control assembly of a vehicle with a drive train containing one transmission. The drive train is powered by an internal combustion engine and at least one second drive unit. It is proposed that also in an operating state, which lies outside of the idle speed, a rotational speed or a torque of the internal combustion engine deviating from values for the engine rotational speed and the torque is set, which would exist during an identical driving condition without the heating-up or keeping warm of the exhaust gas emission control assembly.

Abstract: A method for starting an internal combustion engine that is operated with a fuel mixture made of at least two types of fuel. An injection of the fuel into combustion chambers of the internal combustion engine occurs starting at a predefined pressure threshold of the fuel in a fuel supply according to a high-pressure starting mode, and also according to a low-pressure starting mode if the predefined pressure threshold is no longer met. The pressure threshold is selected as a function of the mixture ratio of the fuel types in the fuel mixture. In this way it can be achieved that differences can be taken into consideration in the optimal mixture formation of the fuel types.

Abstract: In a method for controlling a fuel injection system (10) of an internal combustion engine, wherein the fuel injection system (10) comprises a manifold (24) and a high-pressure pump (20) and a fuel dosing unit (16) is associated with the high-pressure pump (20), wherein the fuel dosing unit (16) controls the amount of fuel delivered, an amount of fuel required for the operation of the internal combustion engine is determined as a function of a correction factor, which is based on a fuel pressure at the inlet of the high-pressure pump (20) and/or on a vapor pressure of the fuel to be delivered.

Abstract: In a method and a device for operating an injection device (5) for an internal combustion engine, the injection device (5) includes injection valves (40), via which fuel is injected directly into combustion chambers (100) of the internal combustion engine. Mechanisms are provided for detecting misfirings (310), and for determining a fuel pressure (320). A mechanical fault of an injection valve (40) is detected when a misfire occurs in a cylinder (110) and the fuel pressure simultaneously drops below a threshold value (SW). An electrical fault in an injection device (5) is detected when misfirings of cylinders (110) assigned to an output stage bank of the injection device (5) are observed, and the fuel pressure has dropped below a threshold value (SW). The responses to the faults that are implemented differ depending on the faults that were detected.

Abstract: A method for starting an internal combustion engine that is operated with a fuel mixture made of at least two types of fuel. An injection of the fuel into combustion chambers of the internal combustion engine occurs starting at a predefined pressure threshold of the fuel in a fuel supply according to a high-pressure starting mode, and also according to a low-pressure starting mode if the predefined pressure threshold is no longer met. The pressure threshold is selected as a function of the mixture ratio of the fuel types in the fuel mixture. In this way it can be achieved that differences can be taken into consideration in the optimal mixture formation of the fuel types.

Abstract: The aim of the invention is to optimize the running smoothness of an internal combustion engine. To achieve this aim, the individual cylinders are synchronized with respect to their torque contribution. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. Fuel is injected into the combustion chamber of the cylinder in a torque neutral manner by way of a secondary injection during a working stroke of the cylinder and the amount of fuel of the secondary injection us calculated in such a manner that the exhaust gas substantially corresponds to a stoichiometric air/fuel mixture.

Abstract: A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.

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 fuel system for an internal combustion engine includes a delivery unit and a pressure region into which the delivery unit feeds; the fuel system includes at least one heater and a control unit, which activates the heater when the delivery unit is switched off so that the pressure in the pressure region does not fall below a limit pressure.

Abstract: The invention deals with a method for the operation of an internal combustion engine with at least two cylinders, which can be operated with a fuel of variable quality stored in a tank and/or with fuel blends stored in the tank from a first and at least a second fuel in variable mixing ratios, and wherein variable fuel qualities and/or fuel blends of different compositions require variable air/fuel ratios for the achievement of a stable combustion and/or have a variable vaporization behavior.

Abstract: A fuel system for an internal combustion engine includes at least one first fuel pump and a pressure region into which the fuel pump pumps and which communicates with an elastic volume reservoir. The elastic volume reservoir has a characteristic pressure/volume curve, which is defined by at least two points. It is proposed that a first point is defined by a first volume at a first pressure that is somewhat greater than a vapor pressure of the fuel at ambient temperature, and that a second point is defined by a second volume and a second pressure in the pressure region that corresponds to a maximum pressure; the difference between the first and second volumes corresponds at least approximately and at least to a value by which the volume of the fuel in the pressure region decreases upon cooling down from a maximum temperature to ambient temperature.

Abstract: The invention relates to a method and a device for operating an injection device (5) for an internal combustion engine, the injection device (5) including injection valves (40), via which fuel is injected directly into combustion chambers (100) of the internal combustion engine. Means are provided for detecting misfirings (310), and for determining a fuel pressure (320). A mechanical fault of an injection valve (40) is detected when a misfire occurs in a cylinder (110) and the fuel pressure simultaneously drops below a threshold value (SW). An electrical fault in an injection device (5) is detected when misfirings of cylinders (110) assigned to an output stage bank of the injection device (5) are observed, and the fuel pressure has dropped below a threshold value (SW). The responses to the faults that are implemented differ depending on the faults that were detected.

Abstract: To achieve a reliable and exhaust-optimized combustion starting already from the beginning of a combustion phase in the startup of an internal combustion engine, the internal combustion engine is brought to a target speed by an electric motor in a drag phase, the target speed being higher than the previously known starting speed. The target speed corresponds approximately to an idling speed assigned to the internal combustion engine, for example. After exceeding the starting speed, first a mixture enrichment is determined, taking into account a prevailing state of a wall film here in particular. Only after reaching the target speed is the fuel metered and does the combustion take place in the combustion phase. The fuel is metered here in particular on the basis of the mixture enrichment determined after exceeding the starting speed.

Abstract: A fuel system for an internal combustion engine includes a delivery unit and a pressure region into which the delivery unit feeds; the fuel system includes at least one heater and a control unit, which activates the heater when the delivery unit is switched off so that the pressure in the pressure region does not fall below a limit pressure.

Abstract: A procedure to recognize a depressurized fuel system of a motor vehicle with an internal combustion engine that includes a parameter characterizing the fuel system temperature is acquired when turning off the internal combustion engine; a parameter characterizing the fuel system temperature is acquired in the immediately subsequent driving cycle when starting the internal combustion engine; and from the difference between the shut-down temperature and the starting temperature, the pressure in the fuel system is inferred.

Abstract: The invention concerns a procedure to heat up or keep warm an exhaust gas emission control assembly of a motor vehicle with a drive train containing one transmission. The drive train is powered by an internal combustion engine and at least one second drive unit. It is proposed that also in an operating state, which lies outside of the idle speed, a rotational speed or a torque of the internal combustion engine deviating from values for the engine rotational speed and the torque is set, which would exist during an identical driving condition without the heating-up or keeping warm of the exhaust gas emission control assembly.

Abstract: A procedure to recognize a depressurized fuel system of a motor vehicle with an internal combustion engine that includes a parameter characterizing the fuel system temperature is acquired when turning off the internal combustion engine; a parameter characterizing the fuel system temperature is acquired in the immediately subsequent driving cycle when starting the internal combustion engine; and from the difference between the shut-down temperature and the starting temperature, the pressure in the fuel system is inferred.