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
A distributed fault-tolerant strategy for the controller area network based electric swing system of hybrid excavators is proposed to achieve good performance under communication errors based on the adaptive compensat...A distributed fault-tolerant strategy for the controller area network based electric swing system of hybrid excavators is proposed to achieve good performance under communication errors based on the adaptive compensation of the delays and packet dropouts. The adverse impacts of communication errors are effectively reduced by a novel delay compensation scheme, where the feedback signal and the control command are compensated in each control period in the central controller and the swing motor driver, respectively, without requiring additional network bandwidth. The recursive least-squares algorithm with forgetting factor algorithm is employed to identify the time-varying model parameters due to pose variation, and a reverse correction law is embedded into the feedback compensation in consecutive packet dropout scenarios to overcome the impacts of the model error. Simulations and practical experiments are conducted. The results show that the proposed fault-tolerant strategy can effectively reduce the communication-error-induced overshoot and response time variation.展开更多
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.
基金the National Natural Science Foundation of China （Nos. 51475414, 51475422, and 51521064） and the National Basic Research Program （973） of China （No. 2013CB035405）
文摘A distributed fault-tolerant strategy for the controller area network based electric swing system of hybrid excavators is proposed to achieve good performance under communication errors based on the adaptive compensation of the delays and packet dropouts. The adverse impacts of communication errors are effectively reduced by a novel delay compensation scheme, where the feedback signal and the control command are compensated in each control period in the central controller and the swing motor driver, respectively, without requiring additional network bandwidth. The recursive least-squares algorithm with forgetting factor algorithm is employed to identify the time-varying model parameters due to pose variation, and a reverse correction law is embedded into the feedback compensation in consecutive packet dropout scenarios to overcome the impacts of the model error. Simulations and practical experiments are conducted. The results show that the proposed fault-tolerant strategy can effectively reduce the communication-error-induced overshoot and response time variation.
