Gear downshift control of inverse-automatic mechanical transmission of electric vehicle  

作　　者：Jinlong Hong Chao Zhang Hankun Chu Bingzhao Gao Hao Wu Guangjie Wei Hua Liu Fuguo Xu 

机构地区：[1]Postdoctoral Station of Mechanical Engineering,School of Automotive Studies,Tongji University,Shanghai,201804,China [2]Qingdao Laiji Transmission System Technology Co.,Ltd,Qingdao [3]United Automotive Electronic Systems Co.,Ltd.,Shanghai,201206,China [4]New Energy Vehicle Engineering Center,Tongji University,Shanghai,201804,China [5]Jiangling Motors Co.,Ltd.,Nanchang,330052,China [6]Nanchang Automotive Institute of Intelligence&New Energy,Tongji University,Nanchang,330052,China [7]Intelligent Robotics Center,Advanced Research Laboratories,Tokyo City University,Japan

出　　处：《Green Energy and Intelligent Transportation》2022年第1期52-62,共11页新能源与智能载运（英文）

基　　金：the National Natural Science Foundation of China under Grant 62003244;the Perspective Study Funding of Nanchang Automotive Institute of Intelligence and New Energy;Tongji University under Grant TPD-TC202110-10,in part by the Jilin Provincial Science&Technology Department under Grant 20200301011RQ;the Fundamental Research Funds for the Central Universities under Grant 22120210160.

摘　　要：In order to improve the driving dynamics and riding comfort of pure electric vehicles,taking a two-speed I-AMT(Inverse-Automatic Mechanical Transmission)with rear friction clutch as the research object,a gear shift strategy,which consists of the open-loop control of the clutch position control and the closed-loop control of the drive motor speed control,is proposed.Considering the inherent time-delay and external disturbances within the motor speed adjustment system,a two DOF(degree-of-freedom)Smith predictor with feedforward input is designed to track the target speed of the drive motor.The feedforward input is used to eliminate the influence of clutch sliding friction on the motor speed control,while the feedback speed tracking controller is applied to realize the speed tracking performance with the existence of time-delay and the external disturbance.In order to verify the effectiveness of the gear shift control strategy and the accuracy of the two DOF Smith controller with feedforward control,simulation results comparison is firstly carried out to illustrate the effectiveness of the control scheme.Then,a light pure electric vehicle equipped with I-AMT was used for downshift experiments under large throttle,which is the most difficult working scenario to control the transmission.The experimental results show that the two DOF Smith controller can eliminate the influence of time-delay on the closed-loop control,and the proposed whole gear shift control strategy can limit the clutch slippage time within 1.5 s,resulting in a smaller shift jerk,thus guarantee the driving dynamics and riding comfort simultaneously.

关 键 词：Gear shift control Pure electric vehicle Inverse-automatic mechanical transmission Two-degree-of-freedom smith controller 

分 类 号：U469.7[机械工程—车辆工程]