Robert Boschgmbh

Markus Peter

Gunther Goetting

Tino Merkel

Markus Kretschmer

Mykhaylo Klymenko

Sven Ahlgrimm

Michael Menzel

The present invention relates to a method () for actuating an electric machine () in the motor starting mode by means of a power electronic system (), in particular for application in a motor vehicle, wherein the power electronic system () has a multiplicity of controllable power switches which are designed to supply the electric machine () with electric current (l_s), wherein a total amount of energy () which is required to reach a predefined rotational speed (n_crit) and a time period (t) for reaching the predefined rotational speed (n_crit) is estimated (), wherein a setpoint torque (M) for starting the electric machine () is determined () on the basis of the estimated total amount of energy () and the estimated time (t), and wherein the power electronic system () is actuated () in accordance with the setpoint torque (M).

Method and device for actuating an electric machine in the motor starting mode

A method is provided for the load-free opening of a separating clutch. The method includes the following steps: receiving a signal for disengaging the clutch; applying a negative torque at the separating clutch using a drive machine; applying a positive, predefined torque at the separating clutch using the drive machine; and opening the separating clutch as soon as the amount of the torque applied at the separating clutch lies within predefined limit values. In other words, a torque in the known range of the system is set via a drive-side deceleration. Then, a drive-side acceleration takes place, so that the torque is increased on the drive side, starting from the known range of the system, until it generally matches the torque on the output side. This enables a load-free opening of the clutch.

Method for the load-free opening of a separating clutch

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.

Growing community of inventors

Zaberfeld, Germany

Markus Peter