工程车辆变速器电液换挡控制系统研究

发布时间：2018-03-18 11:35

本文选题：工程车辆　切入点：变速器　出处：《江苏大学》2017年硕士论文　论文类型：学位论文

【摘要】：工程车辆作业环境复杂恶劣,经常需频繁操纵换挡,作业时传动系统效率往往不高。自动换挡技术在工程车辆上的应用可以改善车辆操纵性,提高作业效率。此外,换挡过程控制技术也影响着车辆平顺性和传动系零部件使用寿命。为此,针对工程车辆变速器电液控制系统的相关研究具有重要的现实意义。本文结合省级项目“工程车辆变速箱操控技术仿真”,以换挡规律和换挡品质控制为研究重心,优化某工程车辆变速器电液换挡系统。针对性的制定换挡规则,并通过控制油压实现换挡离合器的软结合。总结研究工作有几点:(1)对课题工程车辆动力换挡变速器结构、原理及电液换挡系统做了深入分析,确定了论文主要研究路线。(2)在AMESim环境中搭建某工程车辆传动系机械液压部分模型并进行测试,验证所搭建模型的合理性,为后续控制系统研究做准备。(3)研究当前工程车辆换挡规律,针对工程车辆在作业过程中传动效率低的问题,制定合理的换挡规律,使液力变矩器效率最优,推导换挡点及最高挡右侧低效区变矩器闭锁点,并完成模糊换挡控制器的设计及其Matlab实现,结合整车传动系统机械液压模型进行联合仿真,验证了所制定的换挡规律可通过适时挡位切换及变矩器闭锁使变矩器常运行在高效区。(4)分析车辆换挡品质评价指标,明确离合器动作与换挡品质的关系,分析变速器换挡油压特性试验结果发现离合器油压控制上的不足出处,建立换挡动力学模型,计算换挡冲击因素,制定基于电磁阀的离合器油压控制策略,分段控制离合器的充放油过程。利用Simulink软件搭建控制策略模型联合传动系统模型进行起步、换挡过程仿真,验证了所制定的离合器油压控制策略可较好的控制离合器油压变化,使车辆换挡过程合理。
[Abstract]:The working environment of engineering vehicles is complex and harsh, and it is often necessary to control and shift gears frequently, and the efficiency of transmission system is often not high. The application of automatic shifting technology in engineering vehicles can improve vehicle maneuverability and operation efficiency. The shift process control technology also affects the ride comfort of the vehicle and the service life of the parts of the transmission system. It is of great practical significance to study the electro-hydraulic control system of the transmission of engineering vehicles. This paper, combined with the provincial project "Simulation of the gearbox control technology of engineering vehicles", focuses on the shift law and shift quality control. To optimize the electro-hydraulic gearshift system of the transmission of a certain engineering vehicle, to formulate the gearshift rules, and to realize the soft combination of the shift clutch by controlling the oil pressure. The principle and the electro-hydraulic shift system are analyzed in depth, and the main research route of this paper is determined. (2) the mechanical hydraulic part model of the transmission system of a certain construction vehicle is built in AMESim environment and tested, and the rationality of the model is verified. In order to make preparation for the follow-up control system research, this paper studies the shift law of the current engineering vehicle. Aiming at the problem of low transmission efficiency of the engineering vehicle in the course of operation, it formulates the reasonable shift rule to make the hydraulic torque converter efficiency optimal. The shift point and the locking point of the torque converter in the low efficiency zone of the maximum gear are deduced, and the design of the fuzzy shift controller and its Matlab realization are completed. Combined with the mechanical hydraulic model of the whole vehicle transmission system, the joint simulation is carried out. It is verified that the shift rule can be used to analyze the evaluation index of the shift quality of the vehicle by timely gear switching and torque converter locking, and the relationship between clutch action and shift quality is clear. By analyzing the test results of gear shift oil pressure characteristics of transmission, it is found that the oil pressure control of clutch is insufficient, the shift dynamics model is established, the shift impact factor is calculated, and the clutch oil pressure control strategy based on solenoid valve is formulated. Using Simulink software to build control strategy model combined with transmission system model to start, the simulation of shift process proves that the developed clutch oil pressure control strategy can better control the clutch oil pressure change. Make the shift process of the vehicle reasonable.
【学位授予单位】：江苏大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU603;U463.2

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