基于反步法的高频响大流量电液伺服阀阀芯位置控制策略设计OA

High-response and high-flow electro-hydraulic servo valves suffer from severe nonlinearity and poor control accuracy.Owing to large output flow,the flow force acting on the power-stage spool increases significantly,which intensifies system nonlinearity and reduces control accuracy substantially.As a result,it is difficult to improve the frequency response of high-flow electro-hydraulic servo valves.To address this issue,a mathematical model of the electro-hydraulic servo valve is established based on its high-response and high-flow structure.Taking the pilot-stage voltage as input and the power-stage spool position as output,a backstepping control method is designed to improve spool position control accuracy under high-response and high-flow conditions,ensuring high dynamic tracking performance of spool position.Joint simulations using MATLAB and AMESim are conducted under a main valve pressure difference of 7 MPa.Results verify that the proposed control method enables the high-response and high-flow electro-hydraulic servo valve to achieve a frequency response of 81 Hz and a flow rate of 732.56 L/min,meeting operational requirements.Research on the backstepping control method for spool position of high-response and high-flow servo valves provides a theoretical reference for the independent development of such valves in China.