METHOD AND DEVICE FOR DETECTING WHEN A CLOSING POINT OF A HYDRAULIC VALVE HAS BEEN REACHED

摘要

The invention relates to a method and device for detecting when a closing point of a hydraulic valve has been reached. The valve (20) has a closing element (34) that can be operated by an electric actuator (40) for closing said valve (20). A predetermined voltage (U_1) for closing the valve (20) is applied to the actuator (40). A profile of a current flowing through the actuator (40) is detected. Based on a first increase in the profile of the detected current, which represents the fact that the valve (20) is at least partially open, a subsequent decrease in the profile of the detected current, which represents the fact that the closing element (34) is carrying out a movement to close the valve (20), and a second increase in the profile of the detected current following said decrease in the profile of the detected current, a local minimum (I_MIN) of the detected current is then determined between the decrease and the second increase in the profile of the detected current. Depending on the local minimum (I_MIN) of the detected current, a closing point is then determined which corresponds to a time point (T_MIN) of the local minimum (I_MIN) of the detected current.