Parity space-based fault diagnosis of CCBII braking system

HUANG Zhi-wu(黄志武)^{1, 2, 3}, YANG Ying-ze(杨迎泽)^{1, 2, 3}, WANG Jing(王晶)⁴, LI Yun(李赟)^{1, 2, 3}

(1. School of Information Science and Engineering, Central South University, Changsha 410075, China;
2. Institute of Communication, Control and Safe Operation for Transportation System,
Central South University, Changsha 410075, China;
3. Hunan Engineering Laboratory for Advanced Control and Intelligent Automation, Changsha 410075, China;
4. School of Computer Engineering, Bethune-Cookman University, Daytona Beach 32114, USA)

Abstract:Fault diagnosis is a key issue of the CCBII (computer controlled brake II) braking system, because the CCBII braking system is very complicated and nonlinear, which may exhibit isolated and multi-component coupled faults. A parity space-based method was proposed for fault diagnosis of CCBII braking systems. Firstly, the mathematical models were established according to three function modules of CCBII braking systems where the air fluid theory was utilized. Then, parity vector and threshold function were designed for each output of the system so as to identify more system faults. Fault character matrix was built based on the causal relationship between the output and the fault according to the system function and internal structure. Finally, fault detection and isolation can be realized by the comparison of the observed system output and the fault character matrix. Simulation results show that the proposed method is entirely feasible and effective.

Key words:computer controlled brake II braking system; FDI; air fluid theory; parity space