Abstract:The positioning control of cylinder in any intermediate position is a problem with wide practical demand and great technical difficulty. The use of pneumatic servo valves or high speed on-off valves control methods can achieve a higher accuracy of cylinder positioning, but accompanied by a significant increase in costs or a reduction in operating speed. Therefore, an integrated digital valve was used for cylinder position control in order to achieve high precision cylinder position control at a high speed under the premise of low cost. A compact digital valve was designed through theoretical analysis and numerical simulation. The valve could be used to efficiently control the output flow, then switched on the control demand of high-speed large flow and low-speed small flow. On this basis, the position control strategy based on the integrated digital valve was studied. The experimental results show that the system remains stable near the target point when the PID+fuzzy hybrid control strategy is adopted.The repeatability of positioning accuracy is 0.3 mm and the response time is less than 1.2 s. It has good application prospects.