Robert Boschgmbh

Robret Bosch Gmbh

Tino Merkel

Fabian Utermoehlen

Daniel Raichle

Michele Hirsch

Gunther Goetting

Florian Malchow

Markus Kretschmer

Andrea Deflorio

Andreas Koenig

Ulrich Schuster

Bernd Eckert

Dragan Mikulec

Marcel Maur

Hans-Peter Groeter

Mark Damson

Guenther Plapp

Markus Peter

Stephan Hanel

Lingling Xie

Matthias Letzgus

Michael Bangerter

Marc Rudolph

Georg Schneider

An encoder wheel assembly comprising: a first encoder wheel rotationally fixed to a rotor and having a number n of teeth arranged along the circumference of the encoder wheel; a second encoder wheel rotationally fixed to the first encoder wheel, and having the same number n of teeth as the first encoder wheel along the circumference of the encoder wheel, wherein the teeth of the second encoder wheel have an asymmetrical angular offset relative to the teeth of the first encoder wheel; a first sensor designed to scan the first encoder wheel; a second sensor designed to scan the second encoder wheel; and a controller connected to the first sensor and the second sensor and designed to ascertain the absolute angular position and the rotational direction based on a binary signal derived from a first signal of the first sensor and a second signal of the second sensor.

Encoder wheel assembly and method for ascertaining an absolute angular position and a rotational direction

The invention relates to the controlling of a multi-phase rectifier for adapting the temperature distribution in the rectifier. According to the invention, the phase currents in the individual phases are adjusted on the output-side of the rectifier with a different amplitude. Correspondingly, the respective half bridges in the rectifier are loaded to a differing degree. In this way, an uneven temperature distribution can be compensated in the rectifier. Alternatively, an uneven temperature distribution can also be adjusted in the rectifier in a targeted manner, in order to take further parameters into account.

Method for controlling a rectifier, control device for a rectifier and rectifier

The invention relates to the controlling of a rectifier with multiple electrical phases. In at least one electrical phase, the duty cycles are merged with one another in two consecutive cycles of the pulse-width modulated controlling, i.e. in a first PWM-pulse, the duty cycle is shifted to the end of the PWM-pulse, and in a subsequent PWM-pulse, the duty cycle is shifted to the start of the PWM-pulse. As a result, there must be no switching process between two consecutive PWM-pulses. In this way, the switching losses and consequently the rise in temperature of the rectifier can be minimised.

Method for controlling a converter, control device for a converter and converter

The present invention relates to a variation of the clock frequency for pulse-width-modulated actuation of an electrical converter. In this context, the clock frequency can be specifically lowered in an angle range of an electrical period of an AC current to be output. The specific lowering of the clock frequency during predetermined angle ranges of the electrical period allows the load on the switching elements in the converter to be adjusted. As a result, it is possible, by way of example, to adjust the temperature distribution or thermal load in the converter.

Method for actuating a converter, control apparatus for a converter, and converter

The invention relates to a method for controlling an electric machine () subjected to some extent to a reluctance moment in the event of a fault, said method involving the steps of detecting (S) a degree of demagnetization () of the electric machine () in the event of a fault, adjusting (S) a target value generation for controlling the electric machine () on the basis of the degree of demagnetization (), and controlling (S) the electric machine () on the basis of the adjusted target value generation. The invention further relates to a corresponding apparatus ().

Method and apparatus for controlling an electric machine

A method for operating an electric machine () in short-circuit operation, in particular for use in a motor vehicle, characterized by the steps of: measuring at least a first and a second phase current of the electric machine (), comparing the measured phase currents with at least one reference value each, and outputting an error message () if at least one of the phase currents does not agree with the respective reference value ().

Method for operating an electric machine in a short-circuit mode

The invention results in improved switching from the idling mode to an active short circuit mode of an electric machine. According to the invention, the switch from the idling mode to the active electric short circuit mode is delayed until predefined voltage conditions have been reached on the external terminals of an electric machine or until the rotor of the electric machine is in a predetermined position corresponding to the required voltage conditions.

Device and method for operating an electric machine

The present invention provides a method and a device for operating an electric machine for a soft changeover from a normal or free-wheel mode to an active short-circuit. To this end, a voltage with which the electric machine is actuated is first reduced in a defined manner to a predefined, preferably very low value and then the phase connections of the electric machine are short-circuited. Excessively high overcurrents, particularly overcurrents greater than the nominal current of the electric machine, can thus be avoided.

The invention relates to a method () for controlling an inverter () using space-vector pulse width modulation, in particular to control an electric machine (), said inverter () being equipped with a plurality of controllable switches (S) and being designed to provide a polyphase electric current (IU, IV, IW), in particular to supply multiphase electric current to an electric machine (). In said method, a reference phase angle (alpha_R) is predefined, and the inverter () is controlled in such a way that a plurality of different successive switching states (V-V) is established for the switches (S) in order to provide the electric current (IU, IV, IW) in the form of a current space vector (I*). The inverter () is controlled in such a way that the current space vector (I*) is provided at a phase angle (alpha_I) which differs from the reference phase angle (alpha_R), a difference (delta_I) of the phase angle (alpha_I) from the reference phase angle (alpha_R) being determined according to a power loss (PA, PB, PC) and/or a temperature (TA, TB, TC) of at least one of the switches (S).

Method and device for controlling an inverter

The invention relates to a method for controlling an inverter () using space-vector pulse width modulation, in particular to control an electric machine (), the inverter () being equipped with a plurality of controllable switches (S) and being designed to provide a polyphase electric current (IU, IV, IW), in particular to supply polyphase electric current (IU, IV, IW) to the electric machine (). In said method, a desired current space vector (I*) having a desired phase angle (alpha) and a desired amplitude (I) is predefined, and the inverter () is controlled in such a way that a plurality of different successive switching states (V-V) is established for the switches (S) in order to provide the electric current (IU, IV, IW) in the form of a current space vector (I*), the inverter () being controlled in such a way that the current space vector (I*) is provided at a phase angle (alpha) which differs from the desired phase angle (alpha) in order to load the switches (S) according to a desired load value (m) for the switches (S).

In a method for starting a synchronous machine, a default torque is predefined, and a rotational speed of the synchronous machine is adjusted after starting. A torque which is higher than the default torque is predefined, and the higher torque is reduced in the subsequent second step to a positive value which is less than the default torque, and is increased to the default torque in a third step.

Method for starting a synchronous machine

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 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.

Control method and device for an electric machine

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.

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Schwieberdingen, Germany

Tino Merkel