Abstract: The invention relates to a method for limiting the maximum braking performance which can be accessed of a hydrodynamic brake in a motor vehicle, wherein the heat which is generated by the hydrodynamic brake is dissipated by means of a cooling system, with the following steps: the temperature of the hydrodynamic brake and/or the cooling system is detected continuously or at time intervals; a regulating intervention temperature is predefined; a regulating target temperature is predefined; if the temperature of the hydrodynamic brake and/or of the cooling system rises to the regulating intervention temperature or above, the maximum braking performance which can be accessed of the hydrodynamic brake is reduced with a predefined gradient, until a predetermined time period has passed and/or until a constant value of the temperature of the hydrodynamic brake and/or of the cooling system is set.

Abstract: The invention relates to a switch and control device for setting the power or torque transmission in a hydrodynamic machine, comprising at least one primary wheel and a secondary wheel, which together form a working space that can be filled with a working medium—comprising a housing that is composed of a main body and two shells; at least one electronic component that is at least indirectly used for controlling and/or monitoring the hydrodynamic machine or a predetermined state of said machine; at least one control valve that can be actuated by means of the electronic component in order to control a working medium flow in the hydrodynamic machine or into or out of the hydrodynamic machine.

Abstract: A drive train having a hydrodynamic machine and a cooling medium circuit with a liquid or gaseous cooling medium. The hydrodynamic machine has at least one primary impeller, a secondary impeller, at least one control valve, and a control unit. The control unit actuates the at least one control valve in order to control the flow of the working medium into or out of the hydrodynamic machine. The secondary impeller and the at least one primary impeller form a working chamber that can be filled with a working medium. The cooling medium circuit is configured to cool the working medium and the control unit.

Abstract: A drive train having a hydrodynamic machine and a cooling medium circuit with a liquid or gaseous cooling medium. The hydrodynamic machine has at least one primary impeller, a secondary impeller, at least one control valve, and a control unit. The control unit actuates the at least one control valve in order to control the flow of the working medium into or out of the hydrodynamic machine. The secondary impeller and the at least one primary impeller form a working chamber that can be filled with a working medium. The cooling medium circuit is configured to cool the working medium and the control unit.