Valve-controlled cylinder electro-hydraulic system is widely used,and it is important to improve the response,control accuracy and reliability of the system.Traditional closed-loop control is based on feedback error control,which is simple to control,has good stability,and easy to use in complex systems,but there are problems of time lag and stability.As an open-loop control method,feedforward control has the advantages of fast response and no time lag,but the control effect depends on the accuracy of the model.In order to solve the above problems,a feedforward-feedback joint control strategy based on the electro-hydraulic system of valve-con-trolled cylinder was proposed,and mathematical model of the system was established,the simulation model of the system was built by using AMESim software and the feasibility analysis was carried out;a parameter table of servo valve flow-differential pressure-voltage feedforward was established by experiments.Finally the experimental platform of variable-speed and constant-pressure oil source was established based on Simulink and verified by experiments.The simulation and experimental results show that the combined feedforward-feedback control can improve the control accuracy and responsiveness of the valve-controlled cylinder electro-hydraulic system,and the tracking accuracy is increased by 45％compared with the feedback control method,which has a good comprehensive control effect.
关键词
前馈控制/联合控制/恒压系统/阀控缸/电液系统
Key words
feedforward control/joint control/constant pressure system/valve-controlled cylinder/electro-hydraulic system
维普
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