Mr. Maoqing Li Profile

Maoqing Li

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Proceedings Article | 28 August 2024 Paper

Fixed-time fault-tolerant control of electric multiple unit based on fuzzy adaptive

Guojin Zhang, Maoqing Li

Proceedings Volume 13251, 132514N (2024) https://doi.org/10.1117/12.3039566

KEYWORDS: Actuators, Fuzzy logic, Fuzzy systems, Design, Adaptive control

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A fault-tolerant controller is designed using a fuzzy control strategy for scenarios in which there are external disturbances and partial failures of traction/braking actuators during the operation of Electric Multiple Unit (EMU). Firstly, the kinematic equations are listed in the force analysis. The single-mass model of the EMU under the fault is established by considering the external perturbation and the partial failures of the actuators. Secondly, within the framework of the backstepping method, a fuzzy logic system is used to approximate the uncertainty terms in the single-mass mode and an adaptive strategy is used to estimate in real time the uncertainty values present in the system function. Finally, the fault-tolerant controller design process is closely integrated with the finite-time Lyapunov stable theory, which ensures that the closed-loop system consisting of the single-mass model and the controller is stable. The tracking error can converge to a small neighbourhood near the origin at a fixed time, and the convergence time is independent of the initial state of the system. The simulation results show that the CRH3 EMU can effectively track the desired position and speed curves, and the precision stopping error meets the requirement within ±30cm.

Proceedings Article | 1 April 2024 Paper

Fault-tolerant controller design of electric multiple unit system for braking based on controlled Lagrangian method

Yuan Wang, Maoqing Li, Yiqing Wang

Proceedings Volume 13081, 1308102 (2024) https://doi.org/10.1117/12.3025689

KEYWORDS: Control systems, Matrices, Education and training, Design, Actuators, Simulations, Information operations, Complex systems, Nonlinear control, Failure analysis

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A control strategy based on Controlled Lagrangians (CL) is designed for the Electric Multiple Unit (EMU) with a power unit’s actuator complete failure to realize fault-tolerant control in this acticle. Firstly, the multi-particle EMU model is established, which is nonlinear, coupled, and underactuated. Then, the desired controlled energy and generalized forces are used to construct an expected controlled system. By equating the original system with the controlled system, the matching condition and controller structure are confirmed. A smooth nonlinear feedback control law is obtained from simplifying and solving the partial differential equations and algebraic equations of the matching conditions. The control law ensures simultaneous global asymptotic stability of position and velocity, and precision stopping of each power unit. Finally, the controlled energy is selected as the Lyapunov function, and the LaSalle invariance principle is used to prove the asymptotic stability. Simulations demonstrate the effectiveness of the theoretical results and that the controller has a large convergence range.

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