Electrohydraulic proportional high accuracy point to point control based on variable deadzone dynamic compensation

Aim In accordance with the variable deadzone feature of valve controlled motor caused mainly by the static load torque, the large error problem caused by variable deadzone is to be solved in point to point control. Methods An initial value for deadzone compensation was selected. Taking setting-accuracy as target, the appropriate corrected value for deadzone compensation was obtained by self-learning algorithms based on the error and the error change in dynamic response. Results Taking different values within a wide range of load torque, the high precision positioning control is achieved by using the variable deadzone dynamic compensation algorithms. Conclusion The large positioning error caused by variable deadzone in electrohydraulic proportional valve controlled motor point to point control is corrected with this method, and it has good adaptability.