Robert Boschgmbh

Joerg Spranger

Martin Wirth

Stefan Mangold

Julian Doerreich

Johannes Heusser

The invention relates to a method and a control unit, which makes it possible to reliably detect in an electric vehicle whether or not an electric machine is in a blocked state. For this purpose, a current rotational speed of the electric machine () is monitored using a control unit (). If a non-rotating state is detected, the electric machine () is actuated specifically for increasing a torque. The current rotational speed is further monitored, in particular for an increase of the current rotational speed of the electric machine, at least a short-term one, for tensioning a drive train () against a wheel () blocked due to external influences, for example. If this is not the case, it is assumed that the electric machine () is blocked, and a corresponding blocking signal is generated. If the electric machine () is detachably connected to the wheel () via a coupling (), it can be additionally provided that once the non-rotating state is detected, the coupling () is disengaged in order to see if the electric machine () will react to a request for an increased torque with an increased rotational speed, or if this does not happen due to a blocked electric machine.

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Gerlingen, Germany

Joerg Spranger