多级压力源液压切换的位置伺服控制系统

摘要

For conventional valve-controlled servo control system in huge throttling loss,a multilevel pressure hydraulic switching system presented a possible solution to this challenge.Firstly,composition,working principles,definitions of multi-stage output forces and realization of energy-saving mechanism of this new hydraulic system were given,and the mathematical model were established.Secondly,taking a three-level pressure power supply for a displacement control system as example,a hybrid switching control strategy was designed.Finally,an experimental rig was established,and the control and energy saving characteristics of multi-level pressure hydraulic switching system were validated.The results prove that displacement and velocity jitter are existed during pressure switching,it has a significant energy saving effectiveness compared to the conventional hydraulic displacement control systems with the similar useful working energy.%针对传统液压阀控系统传动效率低的问题,提出了一种新型液压回路——多级压力源液压切换系统,给出了该新型液压系统的组成、工作原理、多级输出力的定义以及节能机理的实现,并进行了机理建模;以3个压力等级为例,设计了混合控制策略;搭建了多级压力源液压切换系统原理验证实验台.实验结果表明,多级压力源液压切换系统在位移跟随过程中,压力切换时存在位移和速度抖动;与传统液压位置控制系统相比,该液压系统具有显著的节能效果.