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无级变速器电液控制系统设计
Design of Electronic Hydraulic Control System for CVT
【作者】 李泉；
【作者基本信息】 湖南大学 ， 车辆工程， 2009， 硕士
【摘要】 及动力性。本文围绕金属带式无级变速器的电液控制系统的设计开发等问题进行了深入的研究。首先讨论了金属带式无级变速传动的特点、开发的意义和发展趋势,分析了金属带式CVT的基本结构和变速原理。在详细分析了金属带式无级变速器的传动系统与电液控制系统之后,建立了金属带式无级变速器的动力传动系统模型和液压系统模型,阐述了CVT速比、夹紧力和起步综合控制技术,为进一步设计开发CVT的电子控制装置提供了理论基础。然后根据CVT电液控制系统的控制目标,提出了以英飞凌XE167单片机作为CVT电子控制单元处理器的总体方案,并完成了CVT电子控制单元的传感器信号处理电路和输入输出接口电路的设计。接下来以减小PCB印刷电路板尺寸和提高电子控制装置的稳定性、抗干扰能力为目标,设计了PCB板。最后编写了电子控制单元的软件。设计了夹紧力控制系统和速比控制系统的控制器。由于金属带式无级变速器特殊的传动机理,使得夹紧力和速比的控制相互影响。所以对夹紧力控制系统设计了模糊PID复合控制器,对速比控制系统设计了模糊控制器。在试验台上对设计开发的电液控制系统进行验证和改进设计后,把电控系统移植到汽车上对CVT的电控系统进行整车道路试验。典型工况的性能试验结果表明,所设计的电液控制系统能够满足无级变速器的控制要求,试验过程和控制结果基本上反映了金属带式无级变速器电液控制系统的主要特征,为进一步研究和改进打下了基础。
【Abstract】 The electronic hydraulic control system is the key part of CVT, the thesis mainly focuses on the study of electronic hydraulic control system of CVT. At first, the characteristics, the research purpose and the develop tendency of the metal belt CVT are talked. The structure and the working principle of the CVT are provided.. Based on the analysis and study on the electronic hydraulic control system of CVT, the mathematical models of CVT are established, the technology of the clamp, ratio and synthetic control at standing start are introduced, which is the theoretic foundation for CVT control system.According to the control targets of CVT, the general solution of TCU for CVT which is based on XE167 as microprocessor is put forward. Firstly, the signal conditioning circuit of sensors for TCU is designed. Then, interface circuit which is connected external signal or actuator with microprocessor is analyzed. After accomplishing the logical design of the TCU, printing circuit board (PCB) is devised. In order to decrease the size of PCB and increase the stability of PCB, the author adopts a series of measures to realize the targets above.Besides, the program of the TCU is developed. The thesis designed the clamp and ratio controllers respectively. Due to the special delivery of the metal belt CVT , a fuzzy-PID controller and a fuzzy controller is introduce to the line pressure control system and the ratio control system respectively.After the developed electrical hydraulic control system of CVT is tested and improved on the test-bed, all the control system implemented on the vehicle. The test results of typical driving condition show that the developed electro-hydraulic control system can meet the demand of CVT control, and the system is applicable in practical system.