Enhanced Sliding Mode Control and Online Estimation of Optimal Slip Ratio for Railway Vehicle Braking Systems
Enhanced Sliding Mode Control and Online Estimation of Optimal Slip Ratio for Railway Vehicle Braking Systems
复制标题
铁路车辆制动系统的增强滑模控制和最佳滑移率在线估计
DOI：
10.1007/s12541-018-0079-y
复制
发表时间：
2018-05-01
影响因子：
1.9
通讯作者：
Li, Heng
中科院分区：
文献类型：
--
作者：
Liu, Jianfeng;Peng, Qing;Li, Heng
本文提出了一种最优防抱死控制方案，以提高铁道车辆的制动性能。改进了滑模控制的控制效果，并采用极值搜索算法实现了最优滑移率。首先，提出了一种替代传统符号函数的方法。其次，利用制动系统的闭环观测器来提高附着力的估计值，该估计值也可用于计算参考速度。最后，基于滑模控制的控制器需要输入一个称为最优滑移率的参考滑移率，通过极值搜索算法从滑移率与摩擦系数之间的函数关系中搜索最优滑移率。因此，尽管车轮/轨道表面发生变化，仍能实现最大附着力。仿真结果验证了制动力矩实时调节的效果，保证了制动性能。
This paper proposes an optimal anti-locking control scheme so as to improve the braking performance of railway vehicles. The controlling effect of sliding mode control is improved, and the optimal slip ratio is achieved by extreme seeking algorithm. Firstly, a substitute function for the conventional sign function is proposed. Secondly, a closed loop observer for braking systems is used to enhance the estimation value of adhesion force, which can also be used for calculating reference speed. Finally Sliding Mode Controlbased controller needs to be entered a reference slip ratio called optimal slip ratio, which is searched by extreme seeking algorithm from the functional relationship between slip ratio and friction coefficient. Thus, the maximum adhesion is achieved despite wheel/ rail surface changes. The simulation result demonstrates the effect of real-time adjustment for braking torque, which guarantees the braking performance.