电气化列车RS-485总线应用可靠性研究

Research on Reliability of RS-485 Bus Communication of Electrical Vehicle

电气化列车控制监视系统(TCMS)具有传输距离远、节点多、电磁环境恶劣等特点,RS-485总线是TCMS重要组成部分,保证其可靠、有效的工作对列车安全、平稳运行意义重大。结合现场实测以及Ansoft Maxwell 14软件仿真,对电气化列车RS-485总线网络传输可靠性进行研究,分析了离线电弧放电对RS-485总线干扰的原因。结果表明:离线电弧激发强磁场使车体电位不等,导致其共模干扰电压提高,从而使信息传输掉包。

Train Control and Monitor System （TCMS） have many advantages, such as long transmission, much nodes, anti-harsh elec- tromagnetic environment etc. The RS-485 bus is an important part of the TCMS and it is great significance to ensure its reliability and effectiveness. According to the magnetic field measurement and simulation by software An soft Maxwell 14, the RS-485 bus on trans- mission reliability,information offline produced by arc discharge was researched and analyzed. The results show that unbalance vehicle body voltage influenced by arc discharge is the main cause for information offline.