Protection of hydraulic positioning device against overloading caused by previous damage or misuse e.g. for shift transmission of vehicle, by monitoring operating parameters over time to determine whether a threshold value is exceeded

摘要

The method has the following steps: operating specific values of the positioning drive or its individual components are measured and recorded over time in a computer unit (28), the computer uses the values over a fixed time space to determine and monitor operating specific values and if the values exceed a threshold the computer initiates measured to protect the positioning drive and prevent its overloading. An independent claim is included for a corresponding control device and a hydraulic positioning drive with a coupling, gear and controller. The controller monitors operating specific values, for example the temperature of an electric motor is determined from a thermal model, if the measured value exceeds the theoretical value by a threshold amount power supply to the motor can be interrupted. Cooling during the switched-off phase can be similarly modeled so that at a re-start the a new temperature value can be predicted that reflects the engine status.