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 st...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.展开更多
针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PI...针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PID修正频响曲线的方法,提高了系统对时延的适应性.针对时延的时变性和固定参数PID性能的局限性,设计了一种基于模糊分数阶PID的驱动电机转速控制算法.仿真与台架实验结果表明,该控制算法取得了良好的控制效果.展开更多
基金the National Natural Science Foundation of China under Grant 62003244the Perspective Study Funding of Nanchang Automotive Institute of Intelligence and New Energy+1 种基金Tongji University under Grant TPD-TC202110-10,in part by the Jilin Provincial Science&Technology Department under Grant 20200301011RQthe Fundamental Research Funds for the Central Universities under Grant 22120210160.
文摘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.
文摘针对电动汽车换挡过程的转速控制阶段存在控制器局域网络(controller area network,CAN)通信时延而导致的控制精度低、稳定性差的问题,建立了带有随机时延的驱动电机转速闭环控制数学模型,通过基于伯德图的频域分析,提出了使用分数阶PID修正频响曲线的方法,提高了系统对时延的适应性.针对时延的时变性和固定参数PID性能的局限性,设计了一种基于模糊分数阶PID的驱动电机转速控制算法.仿真与台架实验结果表明,该控制算法取得了良好的控制效果.
