地铁列车车载监控系统实时调度模型研究

Real-time Scheduling Model of Subway Train on-board Monitoring System

车载监控系统应实时周期性获取列车数据,并处理与列车数据采集系统通信过程中的异常情况。通信异常需要车载实时监控系统立即响应,以免造成列车数据丢失。提出了一种多任务的调度模型:周期性任务采用RMS(优先级随速率单调调度算法)调度模型,非周期性任务采用高优先级处理。讨论了该多任务调度模型的可调度性,并将该调度模型应用于车载实时监控系统。实际运行结果证明,该多任务调度模型是可行的。

Subway train on-board monitoring system acquires train data periodically in real time,it also needs to handle the anomaly during communication,because this kind of exceptional cimmunication needs to be processed immediately,to avoid any loss of train data.According to the specific situation,a model of multi-programming schedule,which is called RMS model,is proposed for periodic tasks with higher priority for real-time handling tasks.Also the ability of scheduling the RMS model is discussed in this paper,and the application of RMS model to vehicle real-time monitoring system proves to be feasibile.