Clamping force sensorless control strategies for electromechanical brake systems

被引：0
|
作者：
Zhao Y. [1 ]
Lin H. [1 ]
Li B. [1 ]
机构：
[1] School of Automation, Northwestern Polytechnical University, Xi’an
来源：
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | 2023年 / 49卷 / 10期
基金：
中国国家自然科学基金;
关键词：
active disturbance rejection control; clamping force estimation; electromechanical brake; gap distance adjustment; low-floor trams;
D O I：
10.13700/j.bh.1001-5965.2021.0748
中图分类号：
学科分类号：
摘要：
A clamping force sensorless servo control strategy under strong coupling conditions is proposed for low-floor trams with an electromechanical brake (EMB) system. Firstly, based on the torque characteristic curve of the system, an EMB clearance adjustment strategy is proposed, which does not depend on an additional mechanical adjustment mechanism and clamping force detection device. Considering the inherent hysteresis characteristics during braking and mitigation of the system, a braking force estimation method is also proposed under strong coupling conditions based on the stiffness characteristic curve of the EMB system. Compared with traditional control method, the proposed method can effectively improve the estimation accuracy of braking force and be used as a backup braking scheme to enhance the reliability of the system. In addition, an enhanced extended state observer (ESO) based on Sigmoid functions is designed to estimate and compensate the unmodeled parts and external disturbances in the system. The observed values are feedforward compensated to the integral backstepping controller to eliminate the observation errors of the system and improve the robustness of the system. Finally, the effectiveness of the proposed control strategy is verified through a static experimental platform. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.
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