Existing research on the traction control system（TCS） mainly focuses on control methods, such as the PID control, fuzzy logic control, etc, aiming at achieving an ideal slip rate of the drive wheel over long control...Existing research on the traction control system（TCS） mainly focuses on control methods, such as the PID control, fuzzy logic control, etc, aiming at achieving an ideal slip rate of the drive wheel over long control periods. The initial output of the TCS （referred to as the torque base in this paper）, which has a great impact on the driving performance of the vehicle in early cycles, remains to be investigated. In order to improve the control performance of the TCS in the first several cycles, an algorithm is proposed to determine the torque base. First, torque bases are calculated by two different methods, one based on states judgment and the other based on the vehicle dynamics. The confidence level of the torque base calculated based on the vehicle dynamics is also obtained. The final torque base is then determined based on the two torque bases and the confidence level. Hardware-in-the-loop（HIL） simulation and vehicle tests emulating sudden start on low friction roads have been conducted to verify the proposed algorithm. The control performance of a PID-controlled TCS with and without the proposed torque base algorithm is compared, showing that the proposed algorithm improves the performance of the TCS over the first several cycles and enhances about 5% vehicle speed by contrast. The proposed research provides a more proper initial value for TCS control, and improves the performance of the first several control cycles of the TCS.展开更多
针对传统比例-积分-微分(Proportion Integral Differential,PID)控制方式存在的缺点,提出一种基于牛顿-拉夫逊算法(Newton-Raphson-Based Optimizer,NRBO)的采煤机牵引速度控制方法,并在SIMULINK中搭建仿真模型进行仿真分析。仿真结果...针对传统比例-积分-微分(Proportion Integral Differential,PID)控制方式存在的缺点,提出一种基于牛顿-拉夫逊算法(Newton-Raphson-Based Optimizer,NRBO)的采煤机牵引速度控制方法,并在SIMULINK中搭建仿真模型进行仿真分析。仿真结果表明,与传统PID控制器相比,设计的NRBO-PID控制器达到给定速度的调节时间减少2.5%,没有超调量;当负载突变时,NRBO-PID达到稳定的调节时间减少1%,抗干扰能力更强。这说明NRBO-PID对采煤机牵引速度的控制精度更高、响应更快。展开更多
牵引变流器健康状态关系到重载机车的行车安全,而针对牵引变流器的传统维修策略(如计划修)基于固定时间或里程进行维修,可能导致过度维修并且会增加人力、物力和时间成本。文章研制了一套由车载诊断系统与地面智能运维平台配合使用的重...牵引变流器健康状态关系到重载机车的行车安全,而针对牵引变流器的传统维修策略(如计划修)基于固定时间或里程进行维修,可能导致过度维修并且会增加人力、物力和时间成本。文章研制了一套由车载诊断系统与地面智能运维平台配合使用的重载机车牵引变流器关键部件PHM(prognostics and health management)诊断系统,针对接触器、电容器、电阻器、传感器和联轴节等多个部件进行劣化规律研究并建立了可靠的状态评估模型进行评分,同时,将状态评估结果、故障诊断结果、剩余使用寿命及修程优化结果反馈至地面智能运维平台进行展示,针对不同状态的设备采取不同的维修策略。该技术已在朔黄铁路“神华号”机车上进行了应用,在机车报出的134类故障中,部署PHM系统后可有效诊断其中的56类。应用结果表明,该PHM诊断算法能够正确评估牵引变流器的各关键部件状态,对于性能退化严重的部件能及时预警,有效提升了机车的检修水平与维修效率。展开更多
基金supported by National Natural Science Foundation of China(Grant Nos. 50905092, 51275557)Open Foundation of State Key Laboratory of Automotive Safety and Energy(Grant Nos. zz2011-052, zz2011-021)
文摘Existing research on the traction control system（TCS） mainly focuses on control methods, such as the PID control, fuzzy logic control, etc, aiming at achieving an ideal slip rate of the drive wheel over long control periods. The initial output of the TCS （referred to as the torque base in this paper）, which has a great impact on the driving performance of the vehicle in early cycles, remains to be investigated. In order to improve the control performance of the TCS in the first several cycles, an algorithm is proposed to determine the torque base. First, torque bases are calculated by two different methods, one based on states judgment and the other based on the vehicle dynamics. The confidence level of the torque base calculated based on the vehicle dynamics is also obtained. The final torque base is then determined based on the two torque bases and the confidence level. Hardware-in-the-loop（HIL） simulation and vehicle tests emulating sudden start on low friction roads have been conducted to verify the proposed algorithm. The control performance of a PID-controlled TCS with and without the proposed torque base algorithm is compared, showing that the proposed algorithm improves the performance of the TCS over the first several cycles and enhances about 5% vehicle speed by contrast. The proposed research provides a more proper initial value for TCS control, and improves the performance of the first several control cycles of the TCS.
文摘针对传统比例-积分-微分(Proportion Integral Differential,PID)控制方式存在的缺点,提出一种基于牛顿-拉夫逊算法(Newton-Raphson-Based Optimizer,NRBO)的采煤机牵引速度控制方法,并在SIMULINK中搭建仿真模型进行仿真分析。仿真结果表明,与传统PID控制器相比,设计的NRBO-PID控制器达到给定速度的调节时间减少2.5%,没有超调量;当负载突变时,NRBO-PID达到稳定的调节时间减少1%,抗干扰能力更强。这说明NRBO-PID对采煤机牵引速度的控制精度更高、响应更快。
文摘牵引变流器健康状态关系到重载机车的行车安全,而针对牵引变流器的传统维修策略(如计划修)基于固定时间或里程进行维修,可能导致过度维修并且会增加人力、物力和时间成本。文章研制了一套由车载诊断系统与地面智能运维平台配合使用的重载机车牵引变流器关键部件PHM(prognostics and health management)诊断系统,针对接触器、电容器、电阻器、传感器和联轴节等多个部件进行劣化规律研究并建立了可靠的状态评估模型进行评分,同时,将状态评估结果、故障诊断结果、剩余使用寿命及修程优化结果反馈至地面智能运维平台进行展示,针对不同状态的设备采取不同的维修策略。该技术已在朔黄铁路“神华号”机车上进行了应用,在机车报出的134类故障中,部署PHM系统后可有效诊断其中的56类。应用结果表明,该PHM诊断算法能够正确评估牵引变流器的各关键部件状态,对于性能退化严重的部件能及时预警,有效提升了机车的检修水平与维修效率。
