Abstract: The invention relates to a method for operating an electrical system (1) having a high-voltage section (2) and a low-voltage section (3) which are electrically connected to one another by means of a DC-DC converter (4), wherein the low-voltage section (3) has at least one rechargeable energy store (8) and at least one electrical consumer (9), wherein the DC-DC converter (4) is operated on the basis of an electrical load (P) acting on the low-voltage section (3). In order to determine the load (P), provision is made for all currents flowing through the DC-DC converter (4) to be recorded and added to one another.

Abstract: The invention relates to a method for operating an electrical system (1) having a high-voltage section (2) and a low-voltage section (3) which are electrically connected to one another by means of a DC-DC converter (4), wherein the low-voltage section (3) has at least one rechargeable energy store (8) and at least one electrical consumer (9), wherein the DC-DC converter (4) is operated on the basis of an electrical load (P) acting on the low-voltage section (3). In order to determine the load (P), provision is made for all currents flowing through the DC-DC converter (4) to be recorded and added to one another.

Abstract: The invention relates to a method (30) for the active damping control for an electric vehicle or hybrid vehicle having an electric motor drive element (4), comprising the steps of receiving a current target torque value (tqElmDes) of the electric motor drive element (4), determining a current rotational angle value (?ElmAct) of the electric motor drive element (4), and determining a current damping torque value (tqDmp), characterized in that the current damping torque value (tqDmp) is determined using a reduced drive train model (rTSM).

Abstract: The invention relates to a method for operating an electrical machine (1) controlled by an inverter (2), wherein the inverter (2) comprises half-bridge branches (10-U, 10-V, 10-W) having power components in the form of controllable power switching elements (3) and power diodes (4) respectively connected in parallel therewith, wherein each of the half-bridge branches (10-U; 10-V; 10-W) is arranged on a separate semiconductor module (11-U; 11-V; 11-W), which are arranged jointly on a baseplate (12), wherein the phase currents (1_U, 1_V, 1_W) flowing through the half-bridge branches (10-U, 10-V, 10-W), the voltages present at the power components and temperatures (t_Sens_U, t_Sens_V, t_Sens_W) on the semiconductor modules (11-U, 11-V, 11-W) are determined, from the current (1_U; 1_V; 1_W) respectively flowing at a power component and from the voltage respectively present a power loss (P) is calculated for each of the power components, from the power losses (P) a relevant temperature swing (?t; ?t_Sens) is determ

Abstract: A method is described for controlling an electric machine during a motor startup operation with the aid of a power electronics device, in particular for use in a motor vehicle. The power electronics device includes a plurality of controllable power switches which are connected for the purpose of supplying an electrical current to the electric machine in polyphase form. The power electronics device is controlled in such a way that the electric machine outputs a startup torque, and the control of the power electronics device for outputting the startup torque takes place in such a way that the switching position of at least two of the power switches is changed, with the result that the power switches are subjected to a more uniform load.

Abstract: A method for operating an electric vehicle, the electric vehicle having an electric motor and a brake device, and the electric motor and the brake device being capable of being influenced by a control device. When the electric vehicle is at a standstill, when there is an error of the control device, the brake device is actuated so that the electric vehicle cannot move, or at least can move only to a very limited extent.

Abstract: The invention relates to a method (30) for the active damping control for an electric vehicle or hybrid vehicle having an electric motor drive element (4), comprising the steps of receiving a current target torque value (tqElmDes) of the electric motor drive element (4), determining a current rotational angle value (?ElmAct) of the electric motor drive element (4), and determining a current damping torque value (tqDmp), characterized in that the current damping torque value (tqDmp) is determined using a reduced drive train model (rTSM).

Abstract: The invention relates to a method for operating an electrical machine (1) controlled by an inverter (2), wherein the inverter (2) comprises half-bridge branches (10-U, 10-V, 10-W) having power components in the form of controllable power switching elements (3) and power diodes (4) respectively connected in parallel therewith, wherein each of the half-bridge branches (10-U; 10-V; 10-W) is arranged on a separate semiconductor module (11-U; 11-V; 11-W), which are arranged jointly on a baseplate (12), wherein the phase currents (1_U, 1_V, 1_W) flowing through the half-bridge branches (10-U, 10-V, 10-W), the voltages present at the power components and temperatures (t_Sens_U, t Sens_V, t_Sens_W) on the semiconductor modules (11-U, 11-V, 11-W) are determined, from the current (1_U; 1_V; 1_W) respectively flowing at a power component and from the voltage respectively present a power loss (P) is calculated for each of the power components, from the power losses (P) a relevant temperature swing (?t; ?t_Sens) is determ

Abstract: A method is described for controlling an electric machine during a motor startup operation with the aid of a power electronics device, in particular for use in a motor vehicle. The power electronics device includes a plurality of controllable power switches which are connected for the purpose of supplying an electrical current to the electric machine in polyphase form. The power electronics device is controlled in such a way that the electric machine outputs a startup torque, and the control of the power electronics device for outputting the startup torque takes place in such a way that the switching position of at least two of the power switches is changed, with the result that the power switches are subjected to a more uniform load.

Abstract: A method for controlling an electric motor for driving a motor vehicle with the aid of a drive train, including: measuring the rotation angle of a rotor of the electric motor multiple times, ascertaining the angular velocity and/or the angular acceleration of the rotor as a function of the detected rotation angle, controlling and/or regulating the energization of electromagnets of a stator of the electric motor, the physical behavior of the electric motor and/or the drive train and/or the motor vehicle detected in a physical model, and the rotation angle and/or the angular velocity and/or the angular acceleration ascertained from the measured values of the rotation angle of the rotor using the physical model, and the energization of electromagnets of the stator of the electric motor being carried out as a function of the rotation angle and/or the angular velocity and/or the angular acceleration ascertained using the physical model.

Abstract: A method and a system are described for controlling an electrical machine in a drivetrain of a motor vehicle, the electrical machine being used as a drive unit for the motor vehicle. A pilot control unit determines a pilot control torque as a function of a predefined target torque of the electrical machine, the pilot control unit having a transfer function that corresponds to an oscillation component of a transfer function, ascertained in model-supported fashion for the overall drivetrain, that describes a dependence of a rotation speed of the electrical machine on a torque with which the electrical machine is operated. A control unit for the electrical machine determines a corrected target torque for the electrical machine by superimposing the pilot control torque on the predefined target torque and controlling the electrical machine as a function of the corrected target torque.

Abstract: A method for controlling an electric motor for driving a motor vehicle with the aid of a drive train, including: measuring the rotation angle of a rotor of the electric motor multiple times, ascertaining the angular velocity and/or the angular acceleration of the rotor as a function of the detected rotation angle, controlling and/or regulating the energization of electromagnets of a stator of the electric motor, the physical behavior of the electric motor and/or the drive train and/or the motor vehicle detected in a physical model, and the rotation angle and/or the angular velocity and/or the angular acceleration ascertained from the measured values of the rotation angle of the rotor using the physical model, and the energization of electromagnets of the stator of the electric motor being carried out as a function of the rotation angle and/or the angular velocity and/or the angular acceleration ascertained using the physical model.

Abstract: A method and a system are described for controlling an electrical machine in a drivetrain of a motor vehicle, the electrical machine being used as a drive unit for the motor vehicle. A pilot control unit determines a pilot control torque as a function of a predefined target torque of the electrical machine, the pilot control unit having a transfer function that corresponds to an oscillation component of a transfer function, ascertained in model-supported fashion for the overall drivetrain, that describes a dependence of a rotation speed of the electrical machine on a torque with which the electrical machine is operated. A control unit for the electrical machine determines a corrected target torque for the electrical machine by superimposing the pilot control torque on the predefined target torque and controlling the electrical machine as a function of the corrected target torque.

Abstract: A method for operating an electric vehicle, the electric vehicle having an electric motor and a brake device, and the electric motor and the brake device being capable of being influenced by a control device. When the electric vehicle is at a standstill, when there is an error of the control device, the brake device is actuated so that the electric vehicle cannot move, or at least can move only to a very limited extent.