无级变速器速比电液控制系统改进研究  

Study on An Improved CVT Ratio Electro Hydraulic Control System

作　　者：王成[1,2] 李冰怡[3] 张树培[2] 

机构地区：[1]吉林大学植物科学学院,长春130062 [2]吉林大学汽车工程学院,长春130025 [3]长春工业大学机电工程学院,长春130012

出　　处：《农机化研究》2011年第6期206-209,共4页Journal of Agricultural Mechanization Research

基　　金：吉林大学农学部青年基金项目(4305050102D9)

摘　　要：针对常规CVT速比电液控制系统存在的控制精度低与积分饱和等问题,设计了一种改进CVT速比电液控制系统。分析了改进控制系统的控制原理;基于导磁材料饱和特性及漏磁通考虑,提出高速开关阀新型数学建模方法;采用变速积分算法对传统速比控制器进行改进;对改进控制系统与常规控制系统的阶跃速比进行跟踪对比仿真试验。试验结果表明,改进的控制系统减少了CVT速比控制的超调量,缩短了滞后时间,提高了CVT速比控制系统的性能。Aiming at the problems of the general CVT ratio electro hydraulic control system,which are the lower control accuracy and the integral saturation,an improved CVT ratio electro hydraulic control system was designed.The control theory of the improved control system was analyzed.Based on the magnetic material saturation characteristic and the leakage flux,a new modeling method of PWM high speed on-off valve was presented.Based on the gearshift integral algorithm,the traditional CVT ratio PID controller was improved.CVT step ratio following simulation contrastive experiment was made,which adopted the general control system and the improved control system.The results shown that the improved CVT ratio electro hydraulic control system made the overshoot be reduced and made the delay time be shortened,the CVT ratio control character was enhanced.

关 键 词：CVT 速比控制 PWM高速开关阀 变速积分 

分 类 号：U463.212[机械工程—车辆工程]