二○○九年六月
The Graduation Thesis for Bachelor's Degree Passenger CVT hydraulic
system design
Candidate：Gao XinMing
Specialty：Vehicle Engineering
Class：B05-18
Supervisor：Associate Prof. An YongDong
Heilongjiang Institute of Technology
2009-06·Harbin
摘要
液压控制系统是通过控制金属带轮的夹紧力来实现无级自动变速器速比调节的,其设计方法是开发无级变速传动系统的关键技术之一.在分析了金属带式无级变速器的结构特征和力学关系的基础上,通过对汽车典型行驶工况的仿真分析,提出了无级自动变速液压控制系统关键参数—速比变化率的设计方法,完成了液压系统的结构参数设计,并进行了仿真验证,从而为无级自动变速汽车的研制开发奠定了基础.
针对无级变速器电液控制系统的工作要求，应用数字比例控制技术设计了可用作无级变速器中夹紧力控制阀的数字调压阀。

介绍了该数字调压阀的结构以及驱动器的设计方法，并对其进行了静态特性、动态特性试验。

试验结果表明，该数字调压阀的控制精度及可靠性高，能满足金属带式无级变速器电液控制系统的要求。

关键词:无级变速传动；液压系统；无级变速器；电液控制系统；数字调压阀
ABSTRACT
The design method on the hydraulic control system is one of the key technologies of a metal V-belt continuously variable transmission(CVT).It can change the ratio of the transmission system by adjusting thepu-Shing force of the pulley.By analyzing the structure characteristics andForce relationgs,the design method of an important parameter of the CVTHydranlic system and the rate of transmission ratio are put forward by Simulation to the emblematical driving models. The structure parametersOf hydraulic system is gotten and validated by simulation on specific Driving model. An effective design method is provided to develop the co-ntinuously variable transmission system.
In terms of working requirements of the electric-hydraulic controlSystem of continuous variable transmissions,the ditital pressure regulator valve,which can be used as the clamping force valve of CVT,is designed with the digital proportional control technology .The st-Ructure of the digital pressure regulator valve and design method forDrivers is introduced. Tests of static characteristics and dynamic cha-racteristics of digital pressure regulator valve is high, it can meetrequirements of the electric-hydraulic control system of system of metalv-belt type continuous variable transmission.
Key words:Continuously variable transmission；Hydraulic system；Electric-hydraulic
control system；Digital pressure regulator valve。