Research on a Multi-Functional LED Controller for Highway Tunnels Based on High-Speed Power Line Communication

XIE Zilong; DUAN Xiang; AN Zhenhuan

doi:10.3969/j.issn.1002-6150.2026.02.022

Abstract：Aiming at the existing issues in current highway tunnel LED lighting systems—such as limited dimming interface compatibility,complex communication wiring,and insufficient environmental adaptability—this paper proposes and develops a multifunctional tunnel LED controller based on High-Speed Power Line Communication(HS-PLC).The controller integrates multiple dimming circuits,including PWM and 1–10 V,and enables flexible switching between dimming modes via DIP switches,significantly enhancing device versatility.By adopting HS-PLC instead of conventional wired or wireless communication,the system effectively reduces deployment costs and improves signal transmission reliability within the challenging electromagnetic environment of tunnels.Hardware-wise,it incorporates power metering and millimeter-wave radar modules to enable real-time acquisition of luminaire power consumption,vehicle speed,and traffic flow data.On the software side,it supports four intelligent control strategies:manual control,time-based dimming,luminance-adaptive dimming,and"lights-on-vehicle-approach,lights-off-vehicle-departure"operation,along with power-loss memory retention and automatic status reporting capabilities.A closed-loop feedback mechanism dynamically adjusts illuminance to achieve demand-driven lighting and energy-efficient operation.Furthermore,device authentication,data collision avoidance,and segment-based addressing schemes are implemented to enable precise single-lamp control and unified segment management.Test results demonstrate excellent performance of all dimming circuits,with a command execution accuracy rate of 100%.This solution provides an integrated hardware-software foundation for intelligent tunnel lighting and exhibits strong potential for practical engineering applications.