Dynamic Control of High-speed Train Following Operation

Pan, Deng; Zheng, Yongjun

doi:10.7307/ptt.v26i4.1256

Cited by 21 publications

(7 citation statements)

References 18 publications

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“…Takagi showed that simple kinematic equation-based control laws are sufficient assuming perfectly synchronous control of multiple trains ( 21 ). Pan and Zheng used an empirical safe-following-distance formula to derive simple control laws sufficient for controlling identical trains that respond instantaneously on a flat track profile ( 22 ). Karredla and Srinivas proposed a quasi-moving-block system with an instantaneous spacing-distance formula and computed the steady-state capacity of the system ( 23 ).…”

Section: Objectives and Previous Researchmentioning

confidence: 99%

Comparing the Efficiency and Effectiveness of Different Train-Following Control Algorithms for Fleets of Heavy-Haul Freight Trains under Moving Blocks

Roscoe

Dick

2022

Transportation Research Record: Journal of the Transportation R

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With the nationwide installation of positive train control (PTC) technology recently completed, freight railroads are searching for ways to leverage the technology to improve their operations beyond increasing safety. One possibility is reducing train headways through developing and installing a PTC-based moving-block system, thus increasing the capacity of railroad mainlines without adding costly track infrastructure. Though operating trains at shorter headways can theoretically increase line capacity, effectively controlling following trains becomes more difficult compared with a fixed-block system, requiring a fast-reacting train crew or control algorithm that effectively minimizes headway and fuel consumption while attenuating all fluctuations in lead-train speed. Otherwise, rapid changes in throttle and brake settings may be required, reducing following-train fuel efficiency, generating in-train forces, and diminishing the expected capacity gains from shortened headways. This research, sponsored by the Federal Railroad Administration, aims to better understand how closely following freight trains respond to different throttle- and brake-control algorithms. Using insights from connected automobile and truck platooning technology, the project team developed several train-following control algorithms, analyzed their stability, and simulated their performance with fleets of freight trains subject to different speed profiles. While moving-block systems do require additional train spacing beyond the minimum safe braking distance to account for train control actions, effective train-following control algorithms can minimize this distance. Also, the developed control laws exhibit a trade-off between minimizing train headway and fuel consumption, potentially allowing railway operators to choose an optimal balance.

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Section: Objectives and Previous Researchmentioning

confidence: 99%

Comparing the Efficiency and Effectiveness of Different Train-Following Control Algorithms for Fleets of Heavy-Haul Freight Trains under Moving Blocks

Roscoe

Dick

2022

Transportation Research Record: Journal of the Transportation R

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“…Not only the distance difference but also the velocity difference between trains impacts the following train’s movement. 18 Pan and Zheng 19 introduced three control laws based on the velocity and distance difference concept to simulate train’s operation under the MBS. Following their proposed model, the acceleration rate depends on both velocity and distance difference.…”

Section: Train’s Movement Under the Vcsmentioning

confidence: 99%

State movement for controlling trains operating under the virtual coupling system

Ketphat

Whiteing

Liu

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Train Virtual Coupling System (VCS) has been proposed as a new signalling system for controlling trains by building a group of trains as convoys in order to increase line’s capacity. This is achieved because the consecutive trains under the VCS is separated only by a relative braking distance; this is much shorter than the separation distance required in the Fixed Block Signaling (FBS) and Moving Block Signaling systems (MBS). In order to achieve the high capacity obtained from the VCS, the trains in a virtually coupled convoy should keep at a distance as close to the relative braking distance as possible and run at the same speed for maintaining the safe distance between them. In this paper, we propose a distance and velocity difference approach and introduce the multiple state movements for stimulating train’s movement under the VCS. The simulated results show that the capacity can be significantly increased and maximized in which the actual separation distance between trains when they are in convoy state is slightly longer than the minimum safe distance. It could be ensured that the train has proceeded safely in that the actual separation distance is surely longer than the minimum safe distance throughout the operation time period. In addition, we show that the trains can also proceed smoothly, in that a following train catches up with its leading train and joined in the convoy with a stable movement.

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“…For high‐speed train, the fitting function of safe following distance L s with the velocity V 2 of the following vehicle can be expressed as follows [25]

L_{s} = 0.81 V_{2}^{2} + 48.72 V_{2} + 281.60

and μ is taken as 0.2, δ is taken as 0.05. The simulation can be seen in Figs.…”

Section: Simulations and Analysismentioning

confidence: 99%

Velocity difference control based on dynamic tracking of safe following distance in the process of vehicle following

Pan

Zheng

2014

IET Intelligent Transport Systems

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Dynamic Control of High-speed Train Following Operation

Abstract: ABSTRACT

Cited by 21 publications

References 18 publications

Comparing the Efficiency and Effectiveness of Different Train-Following Control Algorithms for Fleets of Heavy-Haul Freight Trains under Moving Blocks

Comparing the Efficiency and Effectiveness of Different Train-Following Control Algorithms for Fleets of Heavy-Haul Freight Trains under Moving Blocks

State movement for controlling trains operating under the virtual coupling system

Velocity difference control based on dynamic tracking of safe following distance in the process of vehicle following

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