Basic study of a train control system integrating operational & security control

Author: Yoichi Sugiyama
Haruo Yamamoto and Koji Iwata
Day: Introduction Day
Session: Modelling and Modernisation

By recognizing the operation status of all trains in real time through the information network and recalculating the operation plan of each train according to the situation, it is possible to restore operation early in the case of operation disturbance, and to shorten the headway. Therefore, a more flexible and safe train operation can be expected.In the current system, functions of train control and operation management are almost independently advanced (i.e. train position is for each track circuit, and timetable merely consists of departure and arrival times), and since the discrete value of information is handled, realization of flexible transportation is restricted.We propose a new operation control system that integrates the function of operation management, which actively utilizes the features of the wireless train control system. In the system proposed, a driving curve is drawn on a new type of timetable "control map" consisting of combination of precise train positions and detailed passage time at any locations, and trains, turnouts, level crossings etc. are controlled according to plan.In this system, centralized operation control device that integrates both the functions of operation management and the safety control manages the control map. By sending control instructions along the operation curve created by the operation control device to on-board devices or the ground devices, it is possible to precisely control trains, turnouts etc. Also, by periodically gathering the information about position and speed of the train and about state of the facilities from each device, accurate operation management can be performed by the operation control device. In order to realize this system, it is necessary not only to secure its safety but also to verify its feasibility and availability in network performance.(1) Regarding the safety, we designed principles on headway control and route control, and conducted safety assessment with FTA and FMEA to verify the validity of the basic design.(2) As for the feasibility of the network performance, we determined the system configuration corresponding to the model line, and demonstrated the network performance by the network simulator "TCNET" developed by RTRI. Then we confirmed that there are no bottlenecks.(3) With respect to the availability, conditions are set for not only the device composition but also the internal composition of the operation control device. By calculating the system availability according to these conditions, we confirmed the feasible composition.(4) As it was possible to establish the feasible control and composition of the system proposed, through (1) to (3), in order to understand the basic operation of the system proposed, a control method was implemented on the simulator. As for the function of ensuring safety, we demonstrated with the simulator that the train can be stopped in cases where something wrong occurs. We also demonstrated that foreseeing control can be performed to shorten the headway between the preceding train departing from the station and the following train approaching the station in order to confirm the function of improving convenience.In this paper, we describe abovementioned four items of verification.