Abstract: 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 (1) is monitored using a control unit (7). If a non-rotating state is detected, the electric machine (1) 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 (3) against a wheel (5) blocked due 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.

Abstract: 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 (1) is monitored using a control unit (7). If a non-rotating state is detected, the electric machine (1) is actuated specifically for increasing a in 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 (3) against a wheel (5) blocked due 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.

Abstract: A method is introduced for heating an exhaust-gas aftertreatment system (15). The method has the following steps: detection of a necessity to heat (S1) the exhaust-gas aftertreatment system (15), and actuation (S5) of an electric motor (5) in such a way that the electric motor (5) drags the internal combustion engine (3) which produces exhaust gas. Here, the internal combustion engine (3) is held at a predefinable rotational speed by the electric motor (5).