模糊切换在泵阀并联电液伺服系统中的应用

根据液压重载、长行程单出杆液压缸控制系统高性能和高效能的要求,采用阀控开式回路和泵控闭式回路并联驱动非对称液压缸新回路。该回路结合阀控回路的高性能和泵控回路的高效能特点,可以兼顾性能和效能,但泵阀两种回路的切换会给系统带来冲击。为减小该冲击,设计一种二维模糊切换控制器,以液压缸杆的位移误差和速度作为输入,泵阀回路切换系数作为输出;利用AMESim和MATLAB进行联合仿真。结果表明:与直接切换相比,所提方法明显减小了两个回路切换时系统所受的冲击,同时进一步提高了系统的性能和效能。

Application of Fuzzy Switching in Pumps and Valves Parallel Electro-Hydraulic Servo System

According to the high-performance and high-efficiency requirements of the hydraulic cylinder control system with hydraulic heavy-duty and long-stroke single rod,a valve-controlled open circuit and a pump-controlled closed circuit were used to drive a new circuit of asymmetric hydraulic cylinders in parallel.This circuit combined the high performance of the valve control circuit and the high efficiency characteristics of the pump control circuit,but the switching of the two circuits of the pump and valve would bring an impact to the system.In order to reduce the impact,a two-dimensional fuzzy switching controller was designed,in which the displacement error and speed of the hydraulic cylinder rod were used as input and the switching coefficient of the pump valve circuit was used as output;AMESim and MATLAB were used for co-simulation.The results show that compared with the direct switching,using the proposed method can obviously reduce the impact when the two circuits switch,and further improve the performance and efficiency of the system.