Journal of Central South University

 第51卷    第2期    总第306期    2020年2月

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(1. 浙江大学 机械工程学院，浙江 杭州，310027；
2. 名古屋大学 工学研究科，日本 名古屋，4648603
)

Simulation of electro-hydraulic system for train brake based on pressure control of high frequency solenoid valve

1. School of Mechanical Engineering, Zhejiang University, Hangzhou 310027, China；
2. Graduate School of Engineering, Nagoya University, Nagoya 4648603, Japan

Abstract:Aiming at the security of train brake system and energy transformation, storage and recycle, a novel electro-hydraulic system for train brake based on pressure control of high frequency solenoid valve was proposed. The system can recycle part of the train inertial kinetic energy to realize the self-supply energy of the train braking electro-hydraulic system, and the proportional control of the brake hydraulic cylinder pressure by controlling the opening and closing of the high-frequency solenoid valve. According to the working principle of train brake electro-hydraulic system based on pressure control of high-frequency solenoid valve, a mathematical model of the brake electro-hydraulic system was established. An adaptive fuzzy PID controller was employed to adjust the duty cycle of PWM control signal and regulate the switching action of the high-frequency solenoid valve, and thereby pressure proportional control of the brake electro-hydraulic system was achieved. Taking advantage of the AMESim/Simulink joint simulation platform, the mechanical-electronic-hydraulic simulation model of HSV(high-speed switching valve) high-frequency solenoid valve and the adaptive fuzzy PID controller of train brake system were established, and the train brake system was verified.The results show that in the step signal tracking of the brake hydraulic cylinder pressure at 5-10 MPa, the raised time is 0.01-0.02 s, and the maximum overshoot is not more than 0.66%, which proves that the dynamic quality of the brake electro-hydraulic system is excellent. In the slope signal tracking of the brake cylinder pressure at 5-10 MPa, the pressure tracking lag time is both 0.1 s, and the error fluctuations are -0.18-0.15 MPa and -0.20-0.25 MPa, respectively. The pressure fluctuation range and the pressure tracking lag are little, which proves the control accuracy is better, and a better pressure control result is obtained.

Key words: train brake; high frequency solenoid valve; fuzzy PID; duty ratio; pressure control; co-simulation

 中南大学学报（自然科学版） ISSN 1672-7207 CN 43-1426/NZDXZAC 中南大学学报（英文版） ISSN 2095-2899 CN 43-1516/TBJCSTFT