Dynamic Train Coupling Control Method for Urban Rail Transit
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Solution Overview
Problem
Existing urban rail transit control systems do not support dynamic train coupling and uncoupling, leading to fixed train compositions and safety issues due to the inability to adjust parameter information in real-time, which affects passenger flow management and resource utilization.
Innovation Solution
An on-board signal system that automatically recognizes and adjusts to the train's coupling status by collecting and verifying input signals, allowing for safe and reliable dynamic coupling and uncoupling operations, including encoding and decoding of coupling status information and loading corresponding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed train composition is used with pre-stored parameter information, then system complexity is reduced and operation is simplified, but adaptability to varying passenger flow and dynamic coupling/uncoupling operations is lost
Solution Approach 1:
The system transitions from static fixed train composition to dynamic adaptable composition by enabling real-time detection of coupling status through sensor signals and automatic loading of corresponding parameter configurations, allowing the train control system to adapt its parameters dynamically based on actual operational conditions
Solution Approach 2:
The system changes physical or chemical state by switching between different parameter sets (train length, antenna distance, braking curves) based on coupling status, where the controller automatically selects and loads appropriate parameter configurations corresponding to different train compositions without manual intervention
2Productivity
If manual recording of configuration parameters is required before and after composition changes, then data accuracy is maintained, but operation efficiency is reduced and time is lost
Solution Approach 1:
The system performs self-service by automatically detecting coupling status through sensor signals and autonomously loading the corresponding parameter configurations without requiring manual recording or intervention, thereby eliminating time loss and improving operational efficiency
Solution Approach 2:
The system implements feedback by continuously monitoring coupling status signals and automatically adjusting parameter configurations based on detected changes, creating a closed-loop system that responds dynamically to operational conditions without manual input
3Measurement precision
If train composition parameters are not updated in real-time, then system operation is simpler, but positioning accuracy deteriorates and safety problems occur
Solution Approach 1:
The system uses feedback from coupling status sensors to continuously update parameter configurations, ensuring that positioning calculations always use accurate train length and antenna distance data corresponding to the actual train composition, thereby maintaining high measurement precision
Solution Approach 2:
The system replaces manual mechanical configuration processes with automated electronic parameter loading, where the controller automatically retrieves and applies the correct parameter sets from storage based on detected coupling status, eliminating manual intervention while ensuring positioning accuracy
4Productivity
If more trains are deployed during peak hours, then passenger transport capacity is improved, but resource waste occurs during off-peak hours with empty trains
Solution Approach 1:
The system enables dynamic adjustment of train composition by allowing trains to operate in different configurations (coupled or uncoupled) based on passenger demand, so that the same physical train units can provide high capacity during peak hours and reduced capacity during off-peak hours, optimizing resource utilization
Solution Approach 2:
The system makes train units universal by enabling them to perform multiple functions through different coupling configurations, where the same train set can operate as a long composition for high-capacity peak service or split into shorter compositions for lower-demand off-peak service, eliminating the need for dedicated peak-only trains
5Loss of time
If interval between trains on branch roads is reduced by increasing train numbers, then passenger waiting time is reduced, but the limitation of same-line train intervals prevents effective solution
Solution Approach 1:
The system enables dynamic train composition adjustment on branch roads, allowing trains to couple into longer compositions during peak demand to increase capacity and reduce waiting times, or uncouple during lower demand periods, providing flexibility that overcomes the rigid interval limitations of traditional same-line operations
Data Source
AI summary
A control method for supporting dynamic coupling and uncoupling of a train includes: step A, acquiring stored coupling status information during an initialization phase; step B, loading an off-line configuration of a corresponding composition according to the stored coupling status; step C, collecting three sets of input signals related to the coupling; step D, determining whether a train coupling status is proper according to the collected signals, then turning to step E if yes and turning to step F if no; step E, determining whether a current coupling status is consistent with the off-line configuration used in step B, then performing step H if yes and performing step G if no; step F, requesting emergency braking, and reporting an alarming error; step G, requesting emergency braking, re-writing coupling status information with codes after determining that the train is stationary, and then turning to step A for re-initialization.