Design of a wireless transmission communication system for train braking signal

Under the background that railway transportation tends to be high-speed and heavy-haul, the traditional air braking system of heavy-haul train can only be applied to the unit type heavy-haul train, and the maintenance is relatively inconvenient in the later period. Braking brings too much coupler longitudinal force, affecting driving safety. Therefore, the wireless braking system with the advantages of high bandwidth, low delay, and convenient maintenance occurs. In order to solve the above problems, based on the wireless transmission of braking signals, a set of wireless transmission communication system of braking signals based on embedded technology was designed. In terms of hardware, STC8H8K64U was used as the main control chip to complete the schematic design of the communication system, mainly including power module, CAN (Controller Area Network) network module, GPRS (General Packet Radio Service) module, wireless network LoRa (Long Range Radio) module and so on. In addition, the hardware anti-interference processing was completed. In the aspect of software, the peripheral driver design of STC8 and the program design of LoRa wireless network module were completed. Moreover, the communication protocol between the device and the system was customized. Based on the above, the debugging and testing of the communication system were completed, and the communication distance of the wireless network module LoRa was tested. The dynamic model and line test were established to compare the braking wave velocity and coupler longitudinal force under the braking scheme of the traditional air braking scheme and the wireless communication system of the braking signal. The test and experiment results show that each module of the system functions normally and can effectively complete the data interaction with the vehicle control device and the remote control platform. When there are pedestrians, trees, buildings and other occluded objects, the communication distance of wireless network module LoRa is 400 m. The brake signal wireless transmission communication system can effectively increase the brake wave speed and reduce the coupler longitudinal force. The research results can provide reference for the braking system design of heavy-duty train. © 2024, Central South University Press. All rights reserved.