Long Term Testing for Railway’s Light Control Unit
Do, Le Tuan Minh (2025)
2025
Tietotekniikan DI-ohjelma - Master's Programme in Information Technology
Informaatioteknologian ja viestinnän tiedekunta - Faculty of Information Technology and Communication Sciences
Hyväksymispäivämäärä
2025-12-13
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-2025120111143
https://urn.fi/URN:NBN:fi:tuni-2025120111143
Tiivistelmä
Nowadays, railway transport is becoming common and increasing in use in daily life. The railway industry also received advancement in technology, such as LED replacing phosphorous light. As such, the Light Control Unit (LCU), an embedded system used in railway carriage, utilizes PWM technique to control LED lighting became a demanding component. This device adjusts LED lighting depending on various conditions, ensures passenger comfort and safety. However, as an embedded system, LCU suffers operational stresses over an extended period, such as voltage fluctuations, temperature variations, and mechanical vibrations, which can impact the LCU performance and operational lifetime. Moreover, faults might not be detected at the testing phase, only after a long duration. As such, LCU requires addition testing procedures to detect and correct potential hardware and software failures.
This Thesis was done in the Rail Division of Teknoware Oy. The goals are to create a testing framework at the very end of testing process to monitor performance of the LCU in real time, detecting failures that have not been encountered during the testing process, evaluating if the performance met the requirements, and contribute to the company's testing procedure.
The framework continuously monitors CPU status, memory usage, temperature, and voltage, with data logged and transmitted in real-time via syslog protocol to a designated test PC. This monitoring system was developed as a systemd service, installed in the LCU’s debugging Yocto Project’s image as a recipe. The LCUs connect to the train's network through communication protocol, using simulation software. Through remote Syslog server, log messages are saved in the Test PC and separated by the original IP addresses. Regular expressions are used to detect desired fault event messages and push to a Microsoft Teams channel, preventing Information overload in the channel, which leads to channel inactive. The data from each LCUs can be analyzed, visualized and evaluated. The code for this work has been merged and maintained in Teknoware’s Git repository.
This Thesis was done in the Rail Division of Teknoware Oy. The goals are to create a testing framework at the very end of testing process to monitor performance of the LCU in real time, detecting failures that have not been encountered during the testing process, evaluating if the performance met the requirements, and contribute to the company's testing procedure.
The framework continuously monitors CPU status, memory usage, temperature, and voltage, with data logged and transmitted in real-time via syslog protocol to a designated test PC. This monitoring system was developed as a systemd service, installed in the LCU’s debugging Yocto Project’s image as a recipe. The LCUs connect to the train's network through communication protocol, using simulation software. Through remote Syslog server, log messages are saved in the Test PC and separated by the original IP addresses. Regular expressions are used to detect desired fault event messages and push to a Microsoft Teams channel, preventing Information overload in the channel, which leads to channel inactive. The data from each LCUs can be analyzed, visualized and evaluated. The code for this work has been merged and maintained in Teknoware’s Git repository.