MVB的实时能力是基于TCN的列车网络控制系统实时性能的重要保证,详细分析了MVB非周期信息的通信原理和调度流程,对仲裁延迟进行了具体的定义,在研究MVB周期信息和非周期信息带宽占用的基础上,给出了MVB非周期信息的最差情况响应时间。根据非周期信息的各种轮询机制,建立不同优先级的最差情况响应时间计算公式。在此基础上,提出了非周期信息实时能力优化策略,分析表明,该策略有效提高了MVB非周期信息的实时通信能力。
The realtime performance of train network control system based on TCN is guaranteed by realtime capability of MVB. Worst-case response time is obtained by analyzing MVB traffic mechanism of aperiodic messages and the bandwidth shared by both periodic and aperiodic messages. The Calculation formulas of worst-case response time are established to every priority according to the various event-rounding mechanism. Meanwhile, An optimized strategy is proposed which, through verification, turns out to be an efficient way to improve the realtime capability of MVB.