Abstract: Various embodiments include a method comprising: determining a torque output of each cylinder resulting from a fuel injection into the cylinder; determining a difference in the respective torque; comparing the difference in the respective torque output with a threshold; if the difference exceeds the threshold, changing the injection mass for at least one cylinder based on the difference; determining a further torque output of the cylinder resulting from the injection of the changed injection mass; determining whether the further torque output corresponds to the changed injection mass; if the further torque output lies outside a predetermined tolerance range for a corresponding injection mass, setting the injection mass to be injected to the original value; and changing the injection time in at least the one of the at least two cylinders.

Abstract: Various embodiments include method comprising: determining a torque of each cylinder resulting from an injection; determining a difference in the respective torque output; determining a progression of a pressure in one of the cylinders within a cycle; determining a progression of the crankshaft speed within the cycle; determining a time interval between a maximum the pressure and a subsequent maximum of the speed within the cycle; comparing the difference in the torque outputs with a threshold; if the difference exceeds the threshold, determining a progression of the crankshaft speed for each of the cylinders within a respective cycle and determining the respective maxima; determining a respective time of the maxima within the associated cylinder cycle; determining a difference between the respective maxima; and if the difference is greater than a predetermined threshold, changing an injection time in one of the cylinders based on the determined time interval.

Abstract: A method for determining an amount of energy released in the working cycle of an internal combustion engine cylinder includes: (a) recording a time curve of the rotational speed of the engine crankshaft using tooth timings measured using a toothed sensor disc, (b) assigning each tooth timing to a working cycle of a selected cylinder, (c) determining a cylinder-specific average value from the tooth timings assigned to the selected cylinder, (d) determining cylinder-specific tooth timing deviations from the determined cylinder-specific average value, for the tooth timings assigned to each working cycle of the selected cylinder, (e) determining a cylinder-specific characteristic tooth timing by summing the determined tooth timing deviations, and (f) specifying the amount of energy released in the working cycle of the selected cylinder as a function of the determined cylinder-specific characteristic tooth timing, the amount of energy released being indirectly proportional to the determined cylinder-specific chara

Abstract: A controller for an internal combustion engine may comprise a first assignment unit, an observer, a calibration unit, and a second assignment unit. The first assignment unit may determine cylinder-specific measurement signals as a function of the measurement signal from a lambda probe. The observer may include a sensor model of the lambda probe arranged in a feedback branch of the observer. The calibration unit may impress a predefined interference pattern made of cylinder-specific mixture differences and adapt, in reaction to the respectively predefined interference pattern as a function of the observer output variables related to the respective cylinders, an assignment rule between the measurement signal of the lambda probe and a lambda signal. The second assignment unit may carry out, by means of the assignment rule, an assignment between the measurement signal and the lambda signal.

Abstract: A method for determining an amount of energy released in the working cycle of an internal combustion engine cylinder includes: (a) recording a time curve of the rotational speed of the engine crankshaft using tooth timings measured using a toothed sensor disc, (b) assigning each tooth timing to a working cycle of a selected cylinder, (c) determining a cylinder-specific average value from the tooth timings assigned to the selected cylinder, (d) determining cylinder-specific tooth timing deviations from the determined cylinder-specific average value, for the tooth timings assigned to each working cycle of the selected cylinder, (e) determining a cylinder-specific characteristic tooth timing by summing the determined tooth timing deviations, and (f) specifying the amount of energy released in the working cycle of the selected cylinder as a function of the determined cylinder-specific characteristic tooth timing, the amount of energy released being indirectly proportional to the determined cylinder-specific chara

Abstract: Various embodiments include a method for controlling an internal combustion engine comprising: determining a speed of the internal combustion engine; determining a cylinder wall temperature of a combustion cylinder of the internal combustion engine; selecting an injection mode based at least in part on the speed and the cylinder wall temperature; and actuating a fuel injector associated with the combustion cylinder based on the selected injection mode.

Abstract: A method for operating an internal combustion engine is presented in which a noise characteristic value, which is representative of a measurement of a noise of the measurement signal of a respective exhaust gas probe, is determined as a function of a profile of the measurement signal of the respective exhaust gas probe. A pressure characteristic value, which is assigned to a respective cylinder, is determined as a function of a profile of a measurement signal of a crankshaft angle sensor and a profile of a pressure measurement signal of a cylinder pressure sensor. Respective actuation signals for actuating respective injection valves are adapted as a function of the pressure characteristic value and the noise characteristic value assigned to the respective cylinder, for the purpose of approximating an air/fuel ratio in the individual cylinders.

Abstract: Various embodiments may include a method for setting injection timing for injection of a fuel into a combustion chamber of a cylinder of an internal combustion engine including: determining a torque; determining a speed; determining a cylinder wall temperature; selecting the injection timing based at least on the cylinder wall temperature, the torque, and the speed; and controlling an injection of fuel into the combustion chamber using the selected injection timing.

Abstract: The present disclosure teaches method for balancing cylinders in a motor vehicle including an engine which has at least two cylinders. The method may include: determining a cycle period of a cycle of the engine and a number of cycles of the engine, determining a cylinder value function for each cylinder of the engine for each cycle indicative of acceleration of a crankshaft of the engine caused by the corresponding cylinder, carrying out a signal analysis for each cylinder value function, detecting an amplitude for each signal, forming an amplitude mean value for each cylinder, detecting irregular running of the engine on the basis of the amplitude mean values, and compensating for the detected irregular running of the engine.

Abstract: A method for operating an internal combustion engine is presented in which a noise characteristic value, which is representative of a measurement of a noise of the measurement signal of a respective exhaust gas probe, is determined as a function of a profile of the measurement signal of the respective exhaust gas probe. A pressure characteristic value, which is assigned to a respective cylinder, is determined as a function of a profile of a measurement signal of a crankshaft angle sensor and a profile of a pressure measurement signal of a cylinder pressure sensor. Respective actuation signals for actuating respective injection valves are adapted as a function of the pressure characteristic value and the noise characteristic value assigned to the respective cylinder, for the purpose of approximating an air/fuel ratio in the individual cylinders.

Abstract: A method and device for determining a value for a valve lift of a valve of an individual cylinder of a multi-cylinder internal combustion engine are provided. The method includes determining a first exhaust-gas lambda value for fuel combustion in the individual cylinder in a first operating state of the engine by a cylinder-individual and time-resolved detection of lambda values without an artificial variation in an air/fuel ratio. The method also includes determining an air mass sucked in by all cylinders of the engine in the first operating state. The method also includes determining the value for the valve lift of the valve of the individual cylinder based on the first exhaust-gas lambda value, the determined air mass, and a correction value, wherein the correction value is based on a relationship between the valve lift and an associated air mass sucked in by all cylinders of the engine.

Abstract: A method for determining an amount of energy released in the working cycle of an internal combustion engine cylinder includes: (a) recording a time curve of the rotational speed of the engine crankshaft using tooth timings measured using a toothed sensor disc, (b) assigning each tooth timing to a working cycle of a selected cylinder, (c) determining a cylinder-specific average value from the tooth timings assigned to the selected cylinder, (d) determining cylinder-specific tooth timing deviations from the determined cylinder-specific average value, for the tooth timings assigned to each working cycle of the selected cylinder, (e) determining a cylinder-specific characteristic tooth timing by summing the determined tooth timing deviations, and (f) specifying the amount of energy released in the working cycle of the selected cylinder as a function of the determined cylinder-specific characteristic tooth timing, the amount of energy released being indirectly proportional to the determined cylinder-specific chara

Abstract: A controller for an internal combustion engine may comprise a first assignment unit, an observer, a calibration unit, and a second assignment unit. The first assignment unit may determine cylinder-specific measurement signals as a function of the measurement signal from a lambda probe. The observer may include a sensor model of the lambda probe arranged in a feedback branch of the observer. The calibration unit may impress a predefined interference pattern made of cylinder-specific mixture differences and adapt, in reaction to the respectively predefined interference pattern as a function of the observer output variables related to the respective cylinders, an assignment rule between the measurement signal of the lambda probe and a lambda signal. The second assignment unit may carry out, by means of the assignment rule, an assignment between the measurement signal and the lambda signal.

Abstract: A method and a device operate an internal combustion engine having a plurality of cylinders with which are associated respective injection valves for metering fuel, and having an exhaust gas probe which is arranged in an exhaust gas tract and the measurement signal of which is characteristic of the air/fuel ratio in the respective cylinder, and having a crankshaft angle sensor the measurement signal of which is representative of a crankshaft angle of the crankshaft. Within a predefined operating range of the internal combustion engine, and when at least one predefined condition is fulfilled, a rough-running based cylinder-individual diagnosis (CYBL-HOM) with regard to harmful emissions is carried out before activation of a cylinder-individual lambda control (CILC) is enabled.

Abstract: The present disclosure teaches method for balancing cylinders in a motor vehicle including an engine which has at least two cylinders. The method may include: determining a cycle period of a cycle of the engine and a number of cycles of the engine, determining a cylinder value function for each cylinder of the engine for each cycle indicative of acceleration of a crankshaft of the engine caused by the corresponding cylinder, carrying out a signal analysis for each cylinder value function, detecting an amplitude for each signal, forming an amplitude mean value for each cylinder, detecting irregular running of the engine on the basis of the amplitude mean values, and compensating for the detected irregular running of the engine.

Abstract: A method for controlling a variable valve train of an internal combustion engine including multiple cylinders is disclosed. At a first operating point of the engine, an intake air amount is determined and cylinder-individual values for a fuel amount reduction are determined by successively reducing the respectively supplied fuel amount for each cylinder until a characteristic representing uneven running of the engine has reached a predetermined uneven running threshold value. A ratio of a change in the intake valve lift to the resulting change in the intake air amount is determined for the first operating point. Cylinder-individual deviations of the intake valve lift from a reference value are determined based on the ratio, the intake air amount at the first operating point, and the associated value for the fuel amount reduction. The variable valve train is then controlled on the basis of the cylinder-individual deviations of the intake valve lift.

Abstract: An internal combustion engine has a plurality of cylinders with fuel-metering injection valves, and an exhaust gas probe that generates a measurement signal characteristic of the air/fuel ratio in the respective cylinder. A correction signal for fuel mass to be metered is determined using a lambda controller as a function of the exhaust gas probe measurement signal. When at least one predefined condition is met within a predefined operating range of the engine, a cylinder-specific diagnosis relating to the emissions of pollutants is performed on the basis of unsmooth running, wherein the cylinder-specific diagnosis is actively performed only in a respective detection phase that is applied to a neutral value by a modified proportional discrete level of the correction signal and is performed with a modified integral parameter of the lambda controller that is reduced as compared with an integral parameter in a normal operating mode of the lambda controller.

Abstract: A method for determining an amount of energy released in the working cycle of an internal combustion engine cylinder includes: (a) recording a time curve of the rotational speed of the engine crankshaft using tooth timings measured using a toothed sensor disc, (b) assigning each tooth timing to a working cycle of a selected cylinder, (c) determining a cylinder-specific average value from the tooth timings assigned to the selected cylinder, (d) determining cylinder-specific tooth timing deviations from the determined cylinder-specific average value, for the tooth timings assigned to each working cycle of the selected cylinder, (e) determining a cylinder-specific characteristic tooth timing by summing the determined tooth timing deviations, and (f) specifying the amount of energy released in the working cycle of the selected cylinder as a function of the determined cylinder-specific characteristic tooth timing, the amount of energy released being indirectly proportional to the determined cylinder-specific chara

Abstract: A method and device for determining a value for a valve lift of a valve of an individual cylinder of a multi-cylinder internal combustion engine are provided. The method includes determining a first exhaust-gas lambda value for fuel combustion in the individual cylinder in a first operating state of the engine by a cylinder-individual and time-resolved detection of lambda values without an artificial variation in an air/fuel ratio. The method also includes determining an air mass sucked in by all cylinders of the engine in the first operating state. The method also includes determining the value for the valve lift of the valve of the individual cylinder based on the first exhaust-gas lambda value, the determined air mass, and a correction value, wherein the correction value is based on a relationship between the valve lift and an associated air mass sucked in by all cylinders of the engine.

Abstract: A fuel supply device of a combustion engine compromises a fuel pump that pumps fuel into a fuel accumulator, which provides injection valves with fuel and which is connected to a regulator valve that sets the fuel pressure according to an actuating signal (SG). The fuel pressure in the supply device is controlled in such a manner that the actuating signal (SG) is determined according to a desired fuel pressure (FUP_SP) and to quantity that characterizes the dynamics of the flow of the fuel through the regulator valve, and the regulator valve is subsequently controlled by the actuating signal (SG).