Research on Typical Faults and Optimization Solutions for Metro Train Logic Control Units
Journal Title: Urban Mass Transit - Year 2025, Vol 28, Issue 3
Abstract
［Objective］ As a replacement for relays, LCUs (logic control unit) are widely used in urban rail transit trains in China, participating in vehicle control alongside train networks and hardwired signals. Analyzing typical faults encountered during LCU operation and exploring reliable solutions are crucial for ensuring the safety and reliability of metro trains. ［Method］ Focusing on typical LCU faults observed since the opening of Ningbo Rail Transit Line 3 and Line 4, and based on the collected key data, the output waveforms at critical points of the faulty boards are monitored and analyzed to investigate fault mechanisms. The identified causes include component failures on input/output boards and failures in activating the redundancy switching mechanism. Optimization proposals are formulated to enhance fault detection and redundancy switching mechanisms, and output circuit parameters of the driver chips are adjusted. Finally the effectiveness of the optimization proposal is validated through simulation experiments and onboard testing. ［Result & Conclusion］ The dual machine hot-standby redundancy and fault condition active switching mechanisms of LCUs are key advantages over conventional relays and play a critical role in ensuring stable train operation. Testing under normal and voltage regulator fault conditions confirms that the optimization proposel can effectively improve the availability of LCUs.
Authors and Affiliations
Hongli HE, Xing HUANG, Yijun FAN, Manqin SHI, Sunbing FU, Jianle YAN
Keywords
Related Articles
- EP ID EP760179
- DOI 10.16037/j.1007-869x.2025.03.059
- Views 38
- Downloads 0
Research on Data Coupling and Independent Consistency for Urban Rail Transit Intelligent Operation-maintenance
Objective In the context of intelligent operation-maintenance, existing algorithm exhibits low accuracy, resulting in high false alarm rates, hence it is necessary to conduct analysis of data coupling and independent con...
Evaluation Method of Bogie Outer Positioning Anti-rolling Torsion Bar Structural Strength
Objective In order to solve the TBS (torsion bar shaft) torsional stiffness and strength for the outer support anti-rolling device in railway vehicles, an analytical method of introducing the TBS deformation coordination...
Operation Auxiliary Support System for FAO Lines Based on Key Operational Information
Objective Currently, FAO (fully automatic operation) line operational control commands are issued through independent specialized systems with no synergetic collaboration mechanism among them. To ensure consistency in in...
Research on Refined Design of Single Crossover in Urban Rail Transit
［Objective］ The key to high quality development of urban rail transit lies in cost reduction, efficiency improvement, and sustainability, requiring the refined design and the reduction of design redundancy. Crossovers...
Analysis on City (Suburban) Railway Operating Subsidies and Recommendation
［Objective］ Operating subsidies are a crucial guarantee for the healthy development of CSR (city (suburban) railways), reflecting their public service nature. The involvement of national railways in the construction an...