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Processes 2019, 7(2), 77; https://doi.org/10.3390/pr7020077

Energy-Efficient Train Driving Strategy with Considering the Steep Downhill Segment

1,2
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1,2
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1,3,*
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1
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2,3
and
4
1
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China
2
School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China
3
National Engineering Research Center of Rail Transportation Operation and Control System, Beijing Jiaotong University, Beijing 100044, China
4
School of IoT Engineering, Jiangnan University, Wuxi 214122, China
*
Author to whom correspondence should be addressed.
Received: 13 January 2019 / Revised: 27 January 2019 / Accepted: 31 January 2019 / Published: 3 February 2019
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Abstract

Implementation of energy-efficient train driving strategy is an effective method to save train traction energy consumption, which has attracted much attention from both researchers and practitioners in recent years. Reducing the unnecessary braking during the journey and increasing the coasting distance are efficient to save energy in urban rail transit systems. In the steep downhill segment, the train speed will continue to increase without applying traction due to the ramp force. A high initial speed before stepping into the steep downhill segment will bring partial braking to prevent trains from overspeeding. Optimization of the driving strategy of urban rail trains can avoid the partial braking such that the potential energy is efficiently used and the traction energy is reduced. This paper presents an energy-efficient driving strategy optimization model for the segment with the steep downhill slopes. A numerical method is proposed to calculate the corresponding energy-efficient driving strategy of trains. Specifically, the steep downhill segment in the line is identified firstly for a given line and the solution space with different scenarios is analyzed. With the given cruising speed, a primary driving strategy is obtained, based on which the local driving strategy in the steep slope segment is optimized by replacing the cruising regime with coasting regime. Then, the adaptive gradient descent method is adopted to solve the optimal cruising speed corresponding to the minimum traction energy consumption of the train. Some case studies were conducted and the effectiveness of the algorithm was verified by comparing the energy-saving performance with the classical energy-efficient driving strategy of “Maximum traction–Cruising–Coasting–Maximum braking”. View Full-Text
Keywords: rail transit; train control; energy-efficient driving strategy; steep downhill segment; local optimization rail transit; train control; energy-efficient driving strategy; steep downhill segment; local optimization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, W.; Tang, T.; Su, S.; Yin, J.; Cao, Y.; Wang, C. Energy-Efficient Train Driving Strategy with Considering the Steep Downhill Segment. Processes 2019, 7, 77.

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