Wireless Train Detection at Level Crossings
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Solution Overview
Problem
Existing level crossing systems relying on track circuits face limitations in detecting train presence, requiring constant maintenance, wired connections, and restricting train movements due to environmental conditions and maintenance equipment damage, necessitating a solution for reliable train detection without rail wires.
Innovation Solution
A method utilizing wireless communication between onboard and wayside safety processors to detect train presence, eliminating the need for island and approach track circuits, with location determination systems like GPS or beacons to manage level crossing barriers and warning devices, ensuring safe operation without wired connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track circuits are used to detect train presence, then reliable train detection is achieved, but maintenance requirements increase and system reliability decreases due to wire damage by track maintenance equipment
Solution Approach 1:
The patent replaces the mechanical/electrical track circuit system with a wireless communication system. The onboard processor communicates with the wayside processor via wireless signals, eliminating the need for physical wire connections to the rails. This substitution removes the vulnerability to track maintenance equipment damage while maintaining detection reliability through continuous wireless signal transmission.
Solution Approach 2:
The patent extracts and removes the wired track circuit components from the system. By eliminating the physical wire connections that were previously attached to the rails, the system avoids the maintenance issues and reliability problems associated with these vulnerable components, while still achieving train presence detection through wireless means.
2Difficulty of detecting and measuring
If wired track circuits are installed, then train detection capability is provided, but train movements are restricted due to maintenance needs and environmental damage
Solution Approach 1:
The wireless communication system replaces the mechanical track circuit wiring, enabling continuous train operation without interruptions for maintenance or environmental damage repairs. The system maintains detection capability through wireless signals that are not physically vulnerable to track maintenance equipment, thereby improving train movement efficiency and productivity.
3Reliability
If island track circuits are used to keep bars down, then safety is ensured, but system complexity and maintenance costs increase
Solution Approach 1:
The patent replaces the complex wired island track circuit system with a simplified wireless communication approach. The onboard processor and wayside processor communicate wirelessly to maintain bar positioning, reducing system complexity while preserving the safety function. This eliminates the need for physical wire installations and maintenance in the fouling zone.
Solution Approach 2:
The patent removes the complex wired track circuit infrastructure from the system, extracting only the essential safety function and implementing it through wireless communication. This reduction in physical components simplifies the system while maintaining the required safety integrity level.
Data Source
AI summary
Controlling a level crossing of a railway track by providing a train having an onboard processor communicating with a wayside processor associated to a level crossing, said train having a forward end and a rear end; moving the train forward along the railway track lowering down gates of the level crossing when train is at a predetermined distance upon detection of the train approaching the level crossing; when the forward end passes over a first reference point defining the beginning of an island area of the level crossing, sending a first message from the onboard safety processor towards the wayside processor informing that the train is approaching the level crossing; maintaining down gates; when the rear end passes over a second reference point defining the end of the island area, sending a second message from the onboard safety processor to the wayside processor informing that the train has left the level crossing; and lifting the gates.