Railway Level Crossing Detection Using Wireless Magnetometers
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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 that can be damaged, and restricting train movements, necessitating a solution for safe and reliable train detection without rail-attached wires.
Innovation Solution
A system utilizing magnetometers placed at the crossing area to detect changes in the earth's magnetic field caused by trains, with wireless communication to a control unit for activating warning devices, and calibrated magnetic field sources for integrity testing, replacing the need for island track circuits and their maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If track circuits are used to detect train presence and control level crossing, then train detection capability is provided, but wired connections are required that can be damaged by track maintenance equipment
Solution Approach 1:
The patent extracts the detection function from the wired track circuit system and implements it using wireless magnetometers. The magnetometers detect train presence through magnetic field changes without requiring physical connection to the rails, thereby eliminating the vulnerability of wired connections to damage from track maintenance equipment while maintaining reliable train detection capability
Solution Approach 2:
The patent replaces the mechanical/electrical wired track circuit system with a magnetic field-based wireless detection system. Instead of using electrical connections to the rails for detection, the system uses magnetometers that sense magnetic field disturbances caused by passing trains, substituting a contactless magnetic sensing approach for the traditional wired electrical approach
2Reliability
If island track circuits are installed for safety, then SIL-4 train detection is achieved, but constant maintenance and adjustment are required
Solution Approach 1:
The magnetometer-based system requires no constant adjustment or maintenance like traditional track circuits. The wireless sensors operate autonomously without requiring manual calibration or intervention, eliminating the need for constant maintenance and adjustment while maintaining the required SIL-4 safety detection level
Solution Approach 2:
The patent removes the maintenance-intensive wired track circuit infrastructure and replaces it with wireless magnetometers that have no moving parts or connections requiring adjustment. This extraction of the detection function from the wired system eliminates the maintenance burden while preserving safety performance
3Reliability
If track circuits are used for level crossing control, then train detection is provided, but train movements are restricted due to operational limitations
Solution Approach 1:
The patent replaces the restrictive wired track circuit system with wireless magnetometer-based detection. This substitution allows trains to move freely without being constrained by the operational limitations of wired systems, as the magnetic field sensors can detect trains at various positions and speeds without requiring specific track circuit configurations or manual interventions
4Ease of manufacture
If wireless activation is used instead of track circuits, then maintenance expenses are reduced, but train detection capability must be maintained
Solution Approach 1:
The patent implements wireless magnetometer-based detection that eliminates the need for wired track circuits and their associated maintenance expenses. The magnetic field sensing technology provides reliable train detection capability while requiring minimal maintenance, as the wireless sensors have no moving parts, connections, or components that require regular adjustment or repair
Solution Approach 2:
The wireless magnetometer system operates autonomously without requiring the constant maintenance and adjustment that wired track circuits demand. The sensors self-calibrate and continue operating reliably without manual intervention, reducing maintenance expenses while maintaining accurate train detection capability
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
Enables safe and reliable train detection and level crossing control without rail-attached wires, providing SIL-4 reliability and reducing maintenance needs, thus enhancing operational safety and efficiency.
Implementation Method 1
each magnetometer placed at the corners of the crossing area detects a vector of the earth's magnetic field along three axes
Data Source
AI summary
A system controls a level crossing of a railway track installation. The railway track installation includes at least one track. The system includes at least two magnetometers associated with the at least one track and placed at corners of a crossing area between the at least one track and a road. The system also includes a level crossing control unit configured for receiving data from the magnetometers. Each magnetometer is arranged to detect a respective magnetic field vector of the earth's magnetic field and to send data representative of the magnetic field vector to the control unit. The control unit is configured to elaborate the data to detect changes in the magnetic field vectors due to the presence of a train in the crossing area and to control the level crossing as a function of the detected changes.