METHOD AND CONTROL UNIT FOR DETECTING A BLOCKED ELECTRIC MACHINE IN AN ELECTRIC VEHICLE

摘要

The invention relates to a method and a control unit (7), which makes it possible to detect reliably in an electric vehicle whether an electric machine (1) is in a blocked state. For this purpose, an actual rotational speed of the electric machine (1) is monitored using a control unit (7). If a non-rotating state is detected, the electric machine (1) is actuated specifically for increasing torque. The actual rotational speed is further monitored, in particular for an increase of the actual rotational speed of the electric machine (1), at least for a short time, in order to brace a drive train (3) with respect to a wheel (5) which is blocked owing to external influences, for example. If this is not the case, it is assumed that the electric machine (1) is blocked, and a corresponding blocking signal is generated. If the electric machine (1) is detachably connected to the wheel (5) via a coupling (19), it can be additionally provided that, once the non-rotating state is detected, the coupling (19) is disengaged in order to see whether the electric machine (1) will react to a request for increased torque at an increased rotational speed, or whether this does not happen owing to the electric machine (1) being blocked.