Wireless Train Detection for Level Crossing Safety
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Solution Overview
Problem
Existing level crossing control systems using track circuits require constant maintenance, wired connections, and have physical limitations in detecting trains, leading to restricted train movements and safety concerns due to potential damage from track maintenance equipment.
Innovation Solution
A wireless system using transmitters and receivers, such as infrared, laser, or RF beams, to detect train presence without rail-mounted wires, ensuring safe operation of level crossing barriers and maintaining Safety Integrity Level (SIL-4) without the need for wired connections in the fouling zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track circuits are used to detect train presence and control level crossing barriers, then reliable train detection can be achieved, but the system requires constant maintenance and wired connections that are damaged by track maintenance equipment
Solution Approach 1:
The patent extracts the train detection function from the wired track circuit system and relocates it to wireless transceivers positioned away from the fouling zone. This removes the vulnerable wired connections from the maintenance-prone area while preserving the essential train detection capability through wireless signal transmission.
Solution Approach 2:
The patent introduces wireless transceivers as intermediary devices that mediate between the train and the level crossing control system. These transceivers use wireless communication (RF, infrared, laser) to transmit train presence information without requiring physical wired connections to the rails, thus eliminating damage from track maintenance equipment.
2Measurement precision
If wired track circuits are installed in the fouling zone to detect trains, then accurate train presence detection is achieved, but the system becomes vulnerable to damage from track maintenance equipment
Solution Approach 1:
The patent extracts the detection function from the fouling zone by placing wireless transceivers in safe locations away from track maintenance equipment. The transceivers detect trains through wireless signals (RF, infrared, or laser beams) without requiring physical presence in the hazardous fouling zone, thus eliminating exposure to damage from maintenance equipment.
Solution Approach 2:
The patent replaces the mechanical wired track circuit system with a wireless optical or RF-based detection system. This substitution eliminates the need for physical wired connections in the fouling zone, using instead wireless transceivers that communicate through electromagnetic or optical fields, thereby removing the vulnerability to mechanical damage from track maintenance equipment.
3Reliability
If track circuits require wired connections to rails for train detection, then reliable operation is achieved, but train movements are restricted until repairs are made when wires are damaged
Solution Approach 1:
The patent extracts the vulnerable wired connections from the system by implementing wireless train detection using transceivers positioned away from the fouling zone. This allows level crossing operations to continue uninterrupted during track maintenance activities, as the wireless system remains operational without requiring physical access to the rails or vulnerable wired connections.
Solution Approach 2:
The patent introduces wireless transceivers as intermediary devices that enable continuous train detection and level crossing control without relying on wired connections to the rails. These transceivers maintain reliable operation during track maintenance by using wireless communication channels that are not affected by maintenance equipment, thus preventing train movement restrictions.
4Ease of repair
If wireless activation is used to eliminate track circuits, then maintenance costs are reduced, but the island track circuit is still required to keep bars down when a train occupies a short area
Solution Approach 1:
The patent extracts both the approach and island track circuit functions and replaces them with a unified wireless transceiver system. This eliminates the need for wired connections entirely while maintaining the capability to detect trains in all scenarios, including short-occupancy situations, through wireless signal detection and processing.
Solution Approach 2:
The patent implements a universal wireless transceiver system that performs multiple functions previously requiring separate track circuits. The wireless transceivers can detect train approach, determine train presence duration, and control barrier operation for both long and short occupancy scenarios, replacing the specialized approach and island circuits with a single multi-functional wireless system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides reliable and safe detection of trains, reducing maintenance costs and operational restrictions, while ensuring timely activation of level crossing barriers, thus enhancing safety and operational efficiency.
Implementation Method 1
a first transmitter device (8a) is arranged to transmit towards a receiver device (10a) at least a first beam (12)
Data Source
AI summary
A system for controlling a level crossing between a railway track and a road, the system comprising a first couple of transmitters and a second couple of transmitters in proximity of a level crossing area; a first couple of receivers and a second couple of receivers opposite to the transmitters with respect to the railway track, the first couple of transmitters and receivers located on a first side of the road and the second couple of transmitters and receivers located opposite to the first side, a control unit sending and receiving signals from said transmitters and receivers, wherein each couple of transmitters transmits a first beam from a first transmitter towards a corresponding first receiver, and a second beam from a second transmitter towards an opposite second receiver, the control unit activates sending at least one second beam and sends a warning message and/or close bars of the level crossing upon interruption of at least one first beam due to the presence of the train on the railway track.