23. Driver advisory system for long-distance trains by speed transition estimation

Driving operations of train drivers are various. We developed a driver advisory system that reduces the variance, improve punctuality, and save energy consumption. The system combines train speed and location (from Global Navigation Satellite System data) with route data such as stations and gradients to provide real-time estimation of train speed transitions. The system also recommends driving operations to the stations to be passed thorough. A tablet PC in the driver’s cab estimates several train speed transitions for different driving instructions based on the speed and position of the train at the present time, and selects a driving instruction to improve for punctuality and save energy consumption (see Figure 1). And, the system shows the recommended driving instruction to the driver, and shows the time that the train is expected to pass through the station (see Figure 2). The system also provides audio prompts at the appropriate timing. The system saves energy consumption by eliminating unnecessary acceleration and deceleration and reducing losses associated with running resistance and traction equipment.

We used the system as trials on several freight trains and several drivers. We then interviewed the drivers and also asked them to fill in a survey. The responses were generally positive, indicated that the system is easy to use. We investigated the difference in energy consumption when using the system, and found that it delivers energy savings in the range 4% - 14%, depending on factors such as route, gradient and travel time (see Figure 3).