Multimodal Braking System Based on Deceleration Control

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www.seipub.org/ve Vehicle Engineering (VE), Volume 3, 2015 doi: 10.14355/ve.2015.03.004

Multimodal Braking System Based on Deceleration Control Wu Mengling*1, Zhu Lu2, Wang Xiaodong3 1. Institute of Rail Transit, Tongji University, Shanghai 201804, China; 2. CSR QINGDAO SIFANG CO., LTD., Qingdao 266111, China *1

wuml_sh@163.com; 2tczhulu@hotmail.com; 3sf‐wangxiaodong@cqsf.com

Abstract This paper proposes a “Multimodal Braking System based on Deceleration Control” with deceleration as braking control objective, including dynamic brake, permanent magnetic track brake and electro‐pneumatic brake. Respectively, the validity of permanent magnetic track brake and deceleration control is analyzed in detail. The result shows permanent magnet track brake can achieve multilevel control by changing the angle of magnetic axis so that service braking can be realized, which can provide the deceleration of 0.56m/s2; compared with the traditional braking system, the steady‐state error of braking system based on deceleration control is less than 0.062m/s2. Keywords Deceleration Control; Permanent Magnetic Track Brake; Braking System;

Introduction Traditional braking system is composed of air brakes and dynamic brakes, whose braking capacity cannot meet braking requirements of high‐speed train due to the fact that it will decrease with the increase of train speed[1,2]. Therefore, the non‐adhesion braking emerges, such as Eddy‐current Brake is applied on Japan’s Shinkansen series 100, 300 and 700; Linear Magnetic Track Brake is applied on Germany series ICE1 and ICE2; and Eddy Current Brake is applied on ICE3[3]. However, eddy‐current brake and linear magnetic track brake need large amounts of electricity to generate the excitation current[4], while the magnetic track brake can switch to working state without any energy. To realize the multicontrol of permanent magnet track brake, this paper proposes to use servomechanism to control the rotation angle of magnetic axis so that it can be coordinated with electro‐pneumatic brake for service braking. In addition, without accounting for uncertainties in the traditional braking control mode, difference between the actual deceleration and target deceleration is too large to ensure the utilization rate of braking force. Therefore, it is necessary to develop a new type of braking system, which can make use of non‐adhesion brakes and adopt its new control mode and can enhance adaptability of uncertainties. Control of braking system refers to keeping track of braking state variables, including deceleration, velocity and displacement[5,6]. Nankyo has certain impact on the study of tracking of train deceleration[7,8]. However, their theories are based on linear system which does not consider the influence of uncertainties. According to deceleration control proposed by Nankyo, this paper will use adaptive approach to estimate the uncertainties and improve the control accuracy. Control Logic of Multimodal Braking System Based on Deceleration Control This braking system is based on bogie control, which has two sets of control unit. Control units can be divided into two categories: the main control unit (GBCU) and the dependent control unit (SBCU). Control logic of the new braking control system is shown as below Fig.1. Firstly, the brake signal is transmitted to each train’s GBCU and decoded soon. Then the corresponding target deceleration can be calculated. Secondly, according to the axle speed, load signal and brake cylinder pressure, on working out the target braking force, GBCU sends request signal of dynamic brake and permanent magnetic brake.

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