等差式液压机械无级变速器的速比控制理论与试验研究  

Theoretical and Experimental Investigation of Speed Ratio Follow-up Control System on Geometric Type Hydro-mechanical Transmission

作　　者：魏超[1] 苑士华[1] 胡纪滨[1] 宋卫群[2] 

机构地区：[1]北京理工大学车辆传动国家重点实验室,北京100081 [2]中国人民解放军驻318厂军事代表室,北京100053

出　　处：《机械工程学报》2011年第16期101-105,共5页Journal of Mechanical Engineering

基　　金：国家部委基础科研资助项目(A2220060029)

摘　　要：速比跟踪控制是车辆无级变速器控制系统的核心,以等差式液压机械无级变速器为对象开展速比控制理论研究,提出适合于液压机械无级变速器使用的速比控制方法。分析等差式液压机械无级变速器的组成原理,推导出等差式液压机械无级变速器速比关系的一般表达式,获得等差式无级变速器的段位组成方式;结合研究对象具体结构,研究换段时各执行元件的转速关系,提出换段条件;构建速比控制系统的设计框图,分析得到控制器的传递函数,给出控制算法设计方法;对等差两段式液压机械无级变速器进行速比跟踪控制试验,试验结果表明:通过对液压机械无级变速器实施速比控制,能够实现对目标速比的跟踪;当跟踪阶跃速比时不存在稳态误差,跟踪斜坡速比时存在稳态误差。Speed ratio follow-up control is the core of continuously variable transmission（CVT） control system of vehicle.Theory on speed ratio control of arithmetic type hydro-mechanical CVT is studied and the speed ratio control method suitable for hydro-mechanical CVT is proposed.The composition principle of arithmetic type hydro-mechanical CVT is analyzed.The general speed ratio expression of arithmetic type hydro-mechanical CVT is deduced,and the range composition mode of arithmetic CVT is obtained.Referring to the specific structure of research object,the speed relationship among the actuators during range shift is researched and the range shift condition is found.By establishing the design diagram of speed ratio control system,the transfer function of controller is analyzed and the designing method of control algorithm is given.The tests of speed ratio follow-up control are carried out on the two-range arithmetic type hydro-mechanical CVT.Test result shows that through the control of the speed ratio of hydro-mechanical CVT,target speed ratio follow-up can be realized.There is no steady-state error in step speed ratio follow-up,but there is steady-state error in slope speed ratio follow-up.

关 键 词：液压机械无级变速器 速比控制 换段 

分 类 号：TH137[机械工程—机械制造及自动化]