Optimization of train safety distance based on CBTC

In the existing safety brake model, the stopping point of the following train is set at the tail envelope of the preceding train. At this stopping point, the target speed of the rear vehicle is 0, regardless of the traveling distance and the operating speed of the preceding train. Although this method ensures safety, it reduces the efficiency of train operation. In the calculation of the safety point of the rear train, the real-time speed of the preceding train can be considered to narrow the tracking distance. And a more accurate speed detecting scheme is fundamental to narrowing the tracking distance. Based on the existing ATP braking curve, this paper proposed a new scheme to optimize train safety tracking distance by considering the real-time speed of the preceding train in order to shorten the tracking distance