电液比例位置控制系统的研究

摘要

Electrohydraulic proportional position servo system is a system with nonlinear and dead zone. Only using PID controller can not solve the contradiction between rapidity and stability. Basing on LabVIEW platform,aiming at the control problem of electrohydraulic proportional position servo system with dead zone,a fuzzy controller was designed and compared with PID control. Experimental result shows that the using fuzzy controller,the asymmetry of the hydraulic cylinder motion is basically eliminated by compensating dead zone. The effect of fuzzy control is better than PID in rapidity,accuracy and stability.%　　电液比例位置控制系统是非线性、时变性严重的一种系统，且具有变流量死区、变流量增益的特性。单纯采用线性PID控制器难于协调快速性和稳定性之间的矛盾。基于LabVIEW平台，针对电液比例位置系统具有死区非线性的特点，设计模糊控制器，并与PID控制算法进行比较。实验结果表明：模糊控制通过对比例阀死区的补偿，基本消除了液压缸运动的不对称性，并且在快速性、准确性以及稳定性方面优于传统的PID控制，改善了系统的性能。