单摩擦元件纯电动两档变速器换档最优控制  

Optimal Control for Gear Shift of a Pure Electric Vehicle's 2-speed Transmission with Single Friction Clutch

作　　者：叶杰[1] 黄向东[1] 赵克刚[1] 刘延伟[2] 黄谢鑫 YE Jie HUANG Xiangdong ZHAO Kegang LIU Yanwei HUANG Xiexin(Guangdong Key Lab of Automotive Engineering, South China University of Technology, Guangzhou 510640 Mechanical and Electrical Engineering College, Guangdong University of Technology, Guangzhou 510006)

机构地区：[1]华南理工大学广东省汽车工程重点实验室,广州510640 [2]广东工业大学机电工程学院,广州510006

出　　处：《机械工程学报》2016年第20期92-101,共10页Journal of Mechanical Engineering

基　　金：国家自然科学基金(51575189);华南理工大学中央高校基本科研业务费(2015ZZ086)资助项目

摘　　要：针对单摩擦元件纯电动两档变速器的动力换档过程,提出基于极小值原理的双控制变量换档协调优化控制策略。在转矩相阶段,对整车进行稳定加速度控制;在惯性相阶段,构造目标泛函兼顾末时刻点的冲击度和过程中的滑摩功,以电动机、摩擦元件转矩变化率为控制变量,并根据过程中的容许冲击度对控制变量施加约束,针对该带约束条件的波尔扎问题,利用极小值原理最优控制算法求解电动机、摩擦元件的最优状态变化轨迹。在Matlab/Simulink软件平台上搭建换档控制仿真模型,验证自由边界条件下的双控制变量优化控制策略的可行性。并将该换档策略应用于所搭建的试验台架上,换档试验结果表明其能有效地提高换档品质,延长摩擦元件的使用寿命。A pure electric vehicle’s 2-speed transmission with single friction clutch is focused. The coordinating and optimal control with two control variables is proposed for its gearshift process based on the principle of the minimum. In the torque phase, driver power demand（DPD） instead of the traditional driver torque demand（DTD） is adopted to attain constant vehicle’s acceleration. In the inertia phase, the optimal coordinating control is proposed with the torque gradient of friction disk clutch and motor as the two control variables, while with the jerk at the end of inertia phase and the friction work as the optimal objectives. Numerical method is employed to solve the constrained Bolza problem and obtain the optimal state trajectories. Besides, the shift control strategy is simulated on the Matlab/Simulink platform. The simulation results imply that the proposed optimal coordinating shift control based on the minimum principle is a feasible scheme. Through the application of shift control on the bench-test, the results indicate that the shift control strategy can effectively improve shift quality and extend the life span of the friction disk clutch.

关 键 词：自动变速器 波尔扎问题 极小值原理 换档策略 

分 类 号：TH156[机械工程]