Topological manifold‐based monitoring method for train‐centric virtual coupling control systems

Zhang, Yong; Wang, Haifeng

doi:10.1049/iet-its.2019.0330

Cited by 21 publications

(17 citation statements)

References 21 publications

(36 reference statements)

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“…Eq. (6) may be rewritten in an incremental form, and the incremental state equation of train i can be expressed as (8) where is the controlled output variables, and is the controlled output coefficient matrix. Because the control objectives of a virtually coupled train platoon are formation efficiency and passenger comfort, the controlled output variables can be described as…”

Section: B Multitrain Virtually Coupled Motion Modelmentioning

confidence: 99%

“…The application and market potential of virtual connections have been analyzed in [7]. For tracking safety of close-range train unit formation, [8] proposed a topological manifold-based monitoring method and derived safety monitoring theorems to ensure virtual coupling control logic safety. In [9], the blockchain method was adopted to monitor and predict the position of a virtually coupled train on the line to avoid train route conflicts, and a corresponding conflict handling strategy was formulated.…”

Section: Introductionmentioning

confidence: 99%

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A Virtually Coupled Metro Train Platoon Control Approach Based on Model Predictive Control

Gao

Tang

2021

IEEE Access

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In this paper, a virtually coupled train formation (VCTF) control method based on the model predictive control (MPC) framework is proposed. The train track spacing error, velocity error, and riding comfort are chosen as the optimization goals, and the constraints of line speed, collision avoidance of the train platoon, traction/braking performance, and string stability are considered. The virtual coupling operation control problem is converted into a quadratic programming problem with constraints. This paper also proposes a coasting control strategy to improve the output of the MPC controller. Simulation results show that compared with the proportional derivative controller, the proposed control method can simultaneously reduce the tracking error and output acceleration, reducing running energy consumption. A study of a metro line is chosen to analyze the VCTF operation performance, and the simulation results show that the VCTF operation mode can improve the peak capacity and quality of service of flat hours compared with the communication-based train control operation mode. INDEX TERMSVirtually coupled, metro train platoon, model predictive control.

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Section: B Multitrain Virtually Coupled Motion Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Virtually Coupled Metro Train Platoon Control Approach Based on Model Predictive Control

Gao

Tang

2021

IEEE Access

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“…This is a significant challenge to be addressed. Zhang et al [11] propose a topological manifold-based monitoring method to guarantee the safety of the train-centric VC systems. The trains' dynamic behavior under specific control commands can also be supervised by a safety theorem.…”

Section: A Scenarios Of Virtual Coupling Operationmentioning

confidence: 99%

“…The objective function over the predictive horizon is (11) where * ( + | ) represents the predicted state obtained after predicting steps at the sampling time , donates the mass of the train , donates the number of trains in the virtually-coupled train formation, and denotes the length of the predictive horizon (control horizon is assumed equal to the predictive horizon).…”

Section: B a Collision Mitigation Approach By Minimizing The Relativmentioning

confidence: 99%

An Overspeed Protection Mechanism for Virtual Coupling in Railway

et al. 2020

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As a new technology to improve transportation capacity by compressing train tracking interval, virtual coupling (VC) has attracted significant attention from both industry and academia. The traditional overspeed protection mechanism cannot guarantee the safe running for a train fleet. Therefore, in this paper, we study two key problems of the overspeed protection mechanism: the limit speed calculation and the safe control for the protection of train in the formation when overspeed occurs. This paper describes the calculation methods of limit speed difference (LSD) based on relative coordinates and a collision mitigation approach by minimizing the relative kinetic energy, respectively. Finally, the effectiveness of the proposed method is verified through numerical analysis. The proposed calculation method of limit speed can realize large headway at low speed and small headway at high speed, which can meet the time requirement of switch and route arrangement in station areas. The performance of the model predictive control (MPC) based approach is compared with other two control strategies, i.e. basic adaptive cruise control (ACC) and directly maximum braking control (DBC). The simulation results show that the MPC strategy has the best performance among these three strategies in reducing the total relative kinetic energy of virtually-coupled train formation, followed by the DBC control strategy, and the basic ACC control strategy needs to be improved.

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“…Virtual coupling in a train-centric way has also been considered in [30] who also use concepts of topological manifolds. The main difference is the work only focused on train-centric control systems.…”

mentioning

confidence: 99%

A Train Protection Logic Based on Topological Manifolds for Virtual Coupling

Zhang

Wang

James

et al. 2022

IEEE Trans. Intell. Transport. Syst.

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Virtual coupling is a promising innovation aimed at increasing railway capacity. Compared to current railway signaling systems, it allows two or more trains to run with reduced headway between them. However, such reduced headways are a challenge to safety. In this work we consider this challenge by formally describing and verifying an approach to virtual coupling. We propose a general modeling method based on topological manifolds to describe the protection logic for virtual coupling train control systems. We also describe the basic train control elements in topological terms and analyze the line condition of our virtual coupling logic. We establish that the line condition safety requirements and its representation as a manifold are equivalent and further provide a formal definition of the concept of a movement authority with manifold notations. This allows us to consider the dynamic behavior of trains and a series of theorems that establish the correctness of our protection logic for virtual coupling. Finally, we apply the presented methods to a case study. The results show that the proposed method provides a suitable way to realize a virtual coupling logic safely.

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Topological manifold‐based monitoring method for train‐centric virtual coupling control systems

Cited by 21 publications

References 21 publications

A Virtually Coupled Metro Train Platoon Control Approach Based on Model Predictive Control

A Virtually Coupled Metro Train Platoon Control Approach Based on Model Predictive Control

An Overspeed Protection Mechanism for Virtual Coupling in Railway

A Train Protection Logic Based on Topological Manifolds for Virtual Coupling

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