机械式自动变速器（AMT）换挡综合控制技术研究

发布时间：2018-09-05 12:31

【摘要】：为解决装备有机械式自动变速器的汽车换挡时间过长及换挡冲击过大的问题,本文运用物理建模方法,建立了汽车纵向动力学模型,并在AMT传动系统协调控制的基础上设计了AMT的换挡控制策略,进行了汽车AMT的换挡仿真及实验。本论文具体开展和完成了如下研究工作:1.运用多领域物理建模方法进行汽车传动系统纵向动力学建模。在对AMT传动系统建模时,传统的数学建模方法不仅存在建模复杂、模型不易调试等缺点,而且建立精确数学模型的工作量极大;采用多领域物理建模方法建立的模型可读性极佳,也能保证较高的建模效率。为简化建模过程以缩短开发周期,利用Simulink/Simscape中的相关模块进行了AMT传动系统建模。同时为了满足汽车传动系统建模精度的要求,对Simulink/Simscape中的发动机、离合器等模块采用实验数据导入的方式进行了相应的拓展。2.开发了AMT综合换挡控制策略。分析了AMT车辆的换挡流程,采用时序控制使各个总成部件能有序合理的执行相应动作进行换挡,在选挡及进挡阶段基于模糊PID控制对发动机进行了调速,在离合器分离、结合两个阶段中对发动机转矩进行控制。仿真和实验结果表明,该控制策略在保证AMT换挡平顺性的前提下,能有效减少动力中断时间。3.针对电动机械式自动变速器换挡时间较长的特点,对电动AMT选换挡电机进行分析和建模;基于动态滑模控制理论,提出了一种换挡电机动态滑模控制方法,并将它应用于电动AMT汽车选换挡执行机构的位置跟踪控制。通过对比常规PID控制器和滑模控制器的控制效果,证明该算法具有响应速度快、鲁棒性强、跟踪精度高等优点,能有效的改善AMT的换挡品质。4.在建立的物理模型基础上进行仿真研究及实验论证。基于Control Base_MT平台,采用CAN总线技术对被控对象进行标定和调试,以实现AMT换挡程序的正常运行。最终通过仿真及实验结果的比较和分析,验证本文所提出的物理建模方法和AMT换挡控制算法的正确性及有效性。
[Abstract]:In order to solve the problem that the shift time and shift impact of the automobile equipped with mechanical automatic transmission are too long, the longitudinal dynamic model of automobile is established by using the physical modeling method in this paper. Based on the coordinated control of AMT transmission system, the shift control strategy of AMT is designed, and the shift simulation and experiment of AMT are carried out. This thesis has carried out and completed the following research work: 1. Multi-domain physical modeling method is used to model the longitudinal dynamics of automobile transmission system. In the modeling of AMT transmission system, the traditional mathematical modeling method not only has the disadvantages of complex modeling and difficult debugging, but also has a great amount of work in establishing accurate mathematical model. The model built by multi-domain physical modeling method has excellent readability and high modeling efficiency. In order to simplify the modeling process and shorten the development cycle, the modeling of AMT transmission system is carried out by using the relevant modules in Simulink/Simscape. At the same time, in order to meet the requirements of the modeling accuracy of the automobile transmission system, the engine, clutch and other modules in the Simulink/Simscape are extended by the way of the experimental data import. 2. The integrated shift control strategy of AMT is developed. The shift flow of AMT vehicle is analyzed, and the timing control is used to make each assembly component perform the corresponding gear shift in an orderly and reasonable manner. The engine is regulated by fuzzy PID control in the gear selection and advance stages, and the clutch is separated. The torque of the engine is controlled in two stages. Simulation and experimental results show that the proposed control strategy can effectively reduce the power outage time of .3on the premise of ensuring the smoothness of AMT shift. In view of the long shift time of electromechanical automatic transmission, this paper analyzes and models the electric AMT gear selecting motor, and puts forward a dynamic sliding mode control method based on the dynamic sliding mode control theory. It is applied to the position tracking control of the gear selection actuator of electric AMT vehicle. By comparing the control effect of conventional PID controller and sliding mode controller, it is proved that the algorithm has the advantages of fast response speed, strong robustness and high tracking accuracy, and can effectively improve the shift quality of AMT. On the basis of the established physical model, the simulation research and experimental demonstration are carried out. Based on Control Base_MT platform, the controlled object is calibrated and debugged by CAN bus technology to realize the normal running of AMT shift program. Finally, through the comparison and analysis of simulation and experimental results, the correctness and effectiveness of the proposed physical modeling method and AMT shift control algorithm are verified.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.212

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