Abstract: A method for determining an average segment time of an encoder wheel of an internal combustion engine, the encoder wheel being connected in rotationally fixed fashion to a crankshaft of the internal combustion engine, markings being situated along the circumference of the encoder wheel, and the crankshaft of the internal combustion engine passing through specified angular ranges during segment times, segment times being acquired, associated rotational speed values being determined from the segment times, a rotational speed curve being determined from the individual determined rotational speed values, a value of the average rotational speed being determined from the rotational speed curve, and an average segment time being determined from the value of the average rotational speed.

Abstract: In the method provided herein, quantities of fuel are determined during a direct injection of a motor vehicle. In this connection, within one work cycle, test injections are carried out in two cylinders of an internal combustion engine of the motor vehicle during overrun phases, speed oscillations of moved masses of the cylinders are measured and a relative difference in quantity of the fuel quantity of the test injections within one work cycle is determined from the speed oscillations. By evaluating a relative signal between the test injections within one work cycle in the two cylinders, an intrinsic dependence of the drive train of the quantity of fuel signal is compensated.

Abstract: A method for determining an average segment time of an encoder wheel of an internal combustion engine, the encoder wheel being connected in rotationally fixed fashion to a crankshaft of the internal combustion engine, markings being situated along the circumference of the encoder wheel, and the crankshaft of the internal combustion engine passing through specified angular ranges during segment times, segment times being acquired, associated rotational speed values being determined from the segment times, a rotational speed curve being determined from the individual determined rotational speed values, a value of the average rotational speed being determined from the rotational speed curve, and an average segment time being determined from the value of the average rotational speed.

Abstract: A method is provided for ascertaining the fuel quality in an internal combustion engine, in particular of a motor vehicle, in which it is provided, in particular, that a two-stage zero quantity calibration is carried out, in which, in the first stage, a test injection is carried out with a control duration and a first quantity correction is generated, and, in the second stage, two test injections are carried out with the mentioned control duration, whose time interval is selected in such a way that the influence of a pressure wave which is generated by the first test injection on the second test injection is preferably low, and a second quantity correction is generated on the basis of the two test injections, and the first quantity correction and the second quantity correction are compared with one another and the fuel quality is inferred from the result of the comparison.

Abstract: In a method for calibrating a fuel metering system including an injector of an internal combustion engine performing a pilot injection chronologically prior to a main injection, at least two test injections chronologically prior to the pilot injection are provided for the injector, the first test injection being carried out using a first activation duration, in which the injector does not yet open, at least one second test injection being carried out in a subsequent injection cycle using an activation duration which is progressively increased in each case in relation to the first test injection until a change of an operating variable of the fuel metering system or the internal combustion engine results, which activation duration corresponds to a minimum activation duration of the injector.

Abstract: In the method provided herein, quantities of fuel are determined during a direct injection of a motor vehicle. In this connection, within one work cycle, test injections are carried out in two cylinders of an internal combustion engine of the motor vehicle during overrun phases, speed oscillations of moved masses of the cylinders are measured and a relative difference in quantity of the fuel quantity of the test injections within one work cycle is determined from the speed oscillations. By evaluating a relative signal between the test injections within one work cycle in the two cylinders, an intrinsic dependence of the drive train of the quantity of fuel signal is compensated.

Abstract: In a method for calibrating a fuel metering system including an injector of an internal combustion engine performing a pilot injection chronologically prior to a main injection, at least two test injections chronologically prior to the pilot injection are provided for the injector, the first test injection being carried out using a first activation duration, in which the injector does not yet open, at least one second test injection being carried out in a subsequent injection cycle using an activation duration which is progressively increased in each case in relation to the first test injection until a change of an operating variable of the fuel metering system or the internal combustion engine results, which activation duration corresponds to a minimum activation duration of the injector.

Abstract: The invention relates to a method for determining a gas concentration in a measuring gas by means of a gas sensor. In a first mode of operation of an internal combustion engine, in which the gas concentration in the measuring gas is known, a gas concentration signal and a pressure signal are detected. A compensation parameter of the gas sensor is determined from said signals. The thus determined compensation parameter is taken into account in at least one of the two modes of operation of the internal combustion engine for determining the gas concentration.

Abstract: A method for operating an internal combustion engine, in particular of a motor vehicle, is described. The internal combustion engine includes an injector for metering fuel into a combustion chamber. According to the method, the injector is opened during a control period for metering a fuel quantity. A change in a rotary motion of the internal combustion engine, which results from the fuel quantity, is ascertained. A function is ascertained which links the control period to the change in the rotary motion. A minimum control period during which the injector does not open just yet is ascertained with the aid of the function. An operating point-dependent control period of the injector is ascertained as a function of the minimum control period.

Abstract: A method and a device for monitoring a fuel injection system are described. A manipulated variable is modified by a certain amount. A first value of a measured variable is detected prior to the modification and at least a second value is detected after the modification. An error is detected when the first value and/or the at least second value deviate from an expected value.

Abstract: A method and a device for controlling an injection system of an internal combustion engine are described, in which at least two consecutive partial injections are compensated for using pressure wave compensation, it is provided in particular that two test injections having a specified time interval to one another are triggered in a cylinder of the internal combustion engine, the total injection quantity of the at least two partial injections is ascertained, and a deviation between the ascertained total injection quantity and an expected total injection quantity is assumed as the error of the pressure wave compensation and a correction value for the pressure wave compensation is determined therefrom.

Abstract: A method and a device for monitoring a fuel injection system are described. A manipulated variable is modified by a certain amount. A first value of a measured variable is detected prior to the modification and at least a second value is detected after the modification. An error is detected when the first value and/or the at least second value deviate from an expected value.

Abstract: A method for operating an internal combustion engine in which a first rotation parameter is measured at a first end of a shaft of the internal combustion engine, and individual-cylinder rotation parameters are determined using the first rotation parameter. The method is characterized in that a second rotation parameter is measured at a second end of the shaft, and the individual-cylinder rotation parameters are determined using the first rotation parameter and the second rotation parameter. A control unit that controls the method is also presented.

Abstract: The invention relates to a method for determining a gas concentration in a measuring gas by means of a gas sensor. In a first mode of operation of an internal combustion engine, in which the gas concentration in the measuring gas is known, a gas concentration signal and a pressure signal are detected. A compensation parameter of the gas sensor is determined from said signals. The thus determined compensation parameter is taken into account in at least one of the two modes of operation of the internal combustion engine for determining the gas concentration.

Abstract: A method for correcting the position of the angle marks of an incremental gear of a rotary speed sensor and/or rotary angle sensor of an internal combustion engine and to a system therefor.

Abstract: A device and a method for controlling an internal combustion engine are provided, in which a first actuating variable of at least one first actuating element is adapted on the basis of a comparison between a first cylinder-specific variable characterizing the combustion process in at least one cylinder and a setpoint value for this variable. On the basis of at least one second variable, at least one deviation value for at least one additional cylinder is determined. Based on this deviation value, a second actuating variable of a second actuating element is adapted.

Abstract: A method is described for determining the angle-of-rotation position (?) of a shaft of an internal combustion engine, in particular a crank angle (?) of a crankshaft, information at least about incremental angles of rotation (??) of the shaft and running times (T) for each incremental angle of rotation (??) being detected on the basis of signals which indicate the rotation of the shaft and are spaced with intervals between them, and stored at least temporarily the instantaneous angle-of-rotation position (?) being determined in the period of time between two signals by extrapolation of the angle-of-rotation position (?) thus detected, taking into account at least one angular velocity ({overscore (?)}) and/or change in angular velocity (?{overscore (?)}) extrapolated from the stored information. In addition, a corresponding device is also described.

Abstract: A method for correcting the position of the angle marks of an incremental gear of a rotary speed sensor and/or rotary angle sensor of an internal combustion engine and to a system therefor.

Abstract: A device and a method for controlling an internal combustion engine are provided, in which a first actuating variable of at least one first actuating element is adapted on the basis of a comparison between a first cylinder-specific variable characterizing the combustion process in at least one cylinder and a setpoint value for this variable. On the basis of at least one second variable, at least one deviation value for at least one additional cylinder is determined. Based on this deviation value, a second actuating variable of a second actuating element is adapted.

Abstract: A method is described for determining the angle-of-rotation position (?) of a shaft of an internal combustion engine, in particular a crank angle (?) of a crankshaft, information at least about incremental angles of rotation (??) of the shaft and running times (T) for each incremental angle of rotation (??) being detected on the basis of signals which indicate the rotation of the shaft and are spaced with intervals between them, and stored at least temporarily the instantaneous angle-of-rotation position (?) being determined in the period of time between two signals by extrapolation of the angle-of-rotation position (?) thus detected, taking into account at least one angular velocity ({overscore (?)}) and/or change in angular velocity (?{overscore (?)}) extrapolated from the stored information. In addition, a corresponding device is also described.