Train Occupancy Range Expansion for Balise Detection Failures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless train control systems face errors in train position calculation due to wheel wear, slip, or communication failures, leading to potential train crashes, and current correction methods are either too strict or unreliable.
Innovation Solution
An on-board system that uses a rotation detector and communication device to calculate and correct train position, sets detection ranges, counts consecutive detection failures, and expands the train occupancy range when failures occur, ultimately stopping the train when a predetermined failure count is reached to ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the train is stopped each time the train position fails to be corrected due to a communication failure, then the safety is improved, but the train service is negatively impacted
Solution Approach 1:
The system expands the train occupancy range as a cushioning measure before actual collision risk occurs. When detection failures are detected, the occupancy range is expanded to account for potential position errors, creating a safety buffer that prevents crashes without requiring immediate train stops
Solution Approach 2:
The train occupancy range is dynamically adjusted based on detection failure conditions. The range expands when detection failures occur and contracts when normal operation is confirmed, allowing the system to adapt safety measures to actual operational conditions rather than using a static stop rule
2Reliability
If the train occupancy range is expanded when detection failures occur, then the safety is improved, but the precision of train position is reduced
Solution Approach 1:
The occupancy range expansion is applied locally and conditionally rather than globally. Only the portion of the track where detection failures have occurred triggers expansion, and the expansion magnitude is proportional to the number of consecutive failures, maintaining precision in areas with reliable detection
3Ease of manufacture
If the train position is calculated based on rotation detection signal, then the cost of ground-side equipment is reduced, but position error occurs due to wheel wear or slip-or-skid
Solution Approach 1:
The system uses feedback from balise detections to continuously correct and verify the train position. When balises are detected within expected ranges, the position calculation is confirmed and corrected, compensating for cumulative errors from wheel rotation without requiring expensive ground equipment
Data Source
AI summary
An on-board system increases a forward margin distance and a backward margin distance to expand an train occupancy range, when it is determined that position correction communications with a balise fail to be performed when a train passes through an installation position of the balise, that is, when it is determined that a detection failure has occurred. The expanded train occupancy range is restored to the train occupancy range before being expanded, when it is determined that the position correction communications have been successfully performed with a next balise, that is, when detection has been successfully performed.