基于能量调节的电液变转速液压缸位置控制系统

Energy-regulation Based Variable Speed Hydraulic Cylinder Position Control System

电液变转速控制系统因其良好的功率匹配特性和节能特性,得到广泛的应用,但是其响应速度慢的缺点限制了它的应用。为了提高电液变转速系统的响应速度,采用在传统电液变转速控制系统中加入能量调节装置的方法,构成一种新型的液压控制系统,能量调节装置由蓄能器和比例节流阀组成,能够在系统减速时吸收多余的能量,而在系统加速时释放储存的能量,从而加快系统的响应速度。以液压缸位置控制系统为对象,介绍能量调节器和系统的组成,建立能量调节器和整个系统的非线性数学模型,并在该模型的基础上进行系统响应速度和能耗特性的数值仿真分析。仿真结果表明,基于能量调节的电液变转速控制系统具有很好的频率特性,接近节流调速系统,并且能够保持电液变转速系统的良好节能特点。

Variable speed hydraulic control systems were widely used because of the good characteristic of power adaptive and energy-saving. But the dynamic characteristic of variable speed hydraulic control systems is slow, such systems are only suitable for the applications which don＇t require fast dynamic response. To improve the dynamic characteristics of the variable speed hydraulic control systems, an energy regulation device was schemed out to be added on the systems, this will form a new type of hydraulic control system（energy-regulation variable speed hydraulic control system）. The energy regulation device can absorb redundant oil fluid during system deceleration period, as well as release oil flow during system acceleration period. The composition of the energy regulation device and the energy-regulation variable speed hydraulic control.was introduced, and the nonlinear math model of the whole system was derived. Digital simulation of the system was carried out and the simulation results shows that this type of system can improve the dynamic greatly while the energy cost is very little.