安全高效跟驰状态下,后车应当根据前车的行为变化科学调整自身行为,才不至于失去安全高效跟驰状态。首先,建立安全跟驰车距随速度变化的拟合函数,作为后车行为调整的依据,并与目标距离速度控制方式相比较,讨论了全速域范围内一般跟驰情形任意速度条件下绝对安全车距计算对于列车运行控制的重要性。然后,基于后车行为调整单元的始末时间,提出安全车距实时跟踪条件下的两种速差控制律的计算方法,处于安全高效跟驰状态下的后车可根据前车行为变化做适应性调整。仿真实验显示,实际车距能够通过后车行为的科学调整得到很好的控制,而且车辆跟驰时隙可以减小至0,这为安全行车条件下进一步提高行车组织效率提供了工程实现方法。%Under the safe and efficient following state,the following vehicle should scientifically adapt itself to the behavioral change of the preceding vehicle,so as to avoid the loss of the safe and efficient following state. First,the fitting function of safe following distance changing with velocity is established as a criterion for the following vehicle’s behavioral adj ustments,to discuss the importance of calculating the absolute safety follow-ing distance to automatic train control under general following situation with any following speed within full-ve-locity field in comparison with the “distance-to-go”speed control mode.Next,with the start and end time of the following vehicle’s behavioral adj ustment unit as references,two algorithms of velocity-difference control laws are proposed respectively based on the real-time tracking of dynamic safety following distance,by which the following vehicle in the safe and efficient following state can adapt itself to the behavioral change of the pre-ceding vehicle.The simulation shows that the actual following distance can be well controlled by the high-quali-ty behavioral adjustments of the following vehicle,and the time-gap of vehicle departure can be reduced to 0s, which can provide a practical engineering realization method for the further improvement of vehicle organization efficiency under safety.
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