Abstract: The brake system is one of the crucial systems to ensure the safe and normal operation of EMU. The fault diagnosis problem of EMU braking system is studied in this paper. Various types of faults are reproduced based on the braking test platform of high-speed train in CRRC Qingdao Sifang Rolling Stock Research Institute Co., Ltd., China. Researches on fault detection and classification are carried out simultaneously. The convex hull selecting algorithm for fault diagnosis is proposed, which overcomes the problem that the classical convex hull solving algorithm cannot select convex hull vertices in higher dimension due to the high complexity. Based on the proposed algorithm, a convex-hull-vertices-based fault diagnosis method is proposed as well. The proposed method is applied to the fault detection and classification of EMU braking system, and its effect is verified by experiments.

Key words: Braking system, convex hull vertices, fault diagnosis

摘要： 制动系统是确保高速列车安全平稳运行的重要系统之一。针对高速列车制动系统气制动部分的故障诊断问题展开研究。基于中车青岛四方车辆研究所有限公司的气制动试验平台对气制动存在的多种故障进行了复现。针对气制动故障进行了故障检测和故障分类研究。结合故障诊断的需求，提出针对故障诊断的凸包顶点选取算法，克服了经典的凸包求解算法由于算法复杂度过高而无法在较高维上进行凸包求解的问题。在此基础上，提出基于凸包顶点的故障诊断方法。所提方法被应用于高速列车制动系统的故障检测和分类问题中，并通过实验验证了其效果。

关键词: 制动系统, 凸包顶点, 故障诊断