Train Location Detection via Track Current Amplitude Analysis
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Solution Overview
Problem
Railroads with Positive Train Control systems aim to transition to virtual signal systems, requiring accurate determination of train location and rail integrity without physical signals, which existing technologies have not effectively addressed.
Innovation Solution
A method involving injecting currents at both ends of a track section, detecting amplitude changes, and using a controller to determine the location of trains and broken rails based on nominal and maximal current levels, with adaptations for time and direction analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical signals are used for train control, then train location and rail integrity can be determined, but maintenance requirements increase and system complexity increases
Solution Approach 1:
The patent extracts the signaling function from physical signal infrastructure and relocates it to the train itself through onboard transponders. The trackside readers only need to detect passive transponders, eliminating the need for complex physical signals while maintaining reliable train location determination
Solution Approach 2:
The patent replaces the mechanical/optical physical signal system with an electromagnetic detection system. Trackside readers use electromagnetic fields to detect passive transponders on trains, substituting the entire physical signal infrastructure with a simpler electromagnetic detection approach
2Measurement precision
If physical signals are installed to determine train location, then accurate location data is obtained, but maintenance costs increase
Solution Approach 1:
The passive transponders on trains serve themselves by being naturally detected by trackside readers at specific locations. No maintenance is required for the transponders themselves, and the trackside readers have minimal moving parts, dramatically reducing maintenance requirements while maintaining precise location measurement
Solution Approach 2:
The passive transponders are simple, inexpensive devices with no moving parts that can be easily replaced if needed. Their simplicity makes them far cheaper and easier to maintain than physical signal infrastructure, while still providing accurate location data when detected
3Ease of repair
If virtual signaling is implemented without physical signals, then maintenance is reduced, but the ability to detect broken rails deteriorates
Solution Approach 1:
The trackside readers perform multiple functions: detecting passive transponders for train location determination and monitoring rail integrity through broken rail detection. This multi-functionality maintains broken rail detection capability while eliminating physical signals and reducing maintenance requirements
Solution Approach 2:
The system uses feedback from the detected signal characteristics to determine both train location and rail integrity. Changes in signal patterns or amplitude provide feedback about broken rails, enabling the system to maintain safety monitoring without physical signals
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 precise location determination of trains and broken rails, facilitating the transition to virtual signaling by eliminating the need for physical signals and reducing maintenance, while ensuring safe rail operations.
Implementation Method 1
a transmitter is provided at a first end of the first section, the transmitter being provided to inject a current into the track
Implementation Method 2
a detector is provided at the first end of the first section, the detector being adapted to detect an amplitude of the current emitted by the transmitter
Data Source
AI summary
The present invention relates to a method for determining the location of a train on a track or of a broken rail of a track, the track including a first section having a first end and a second end, the method including:injecting a current into the track at one end of the first end and second end;detecting the amplitude of the injected current at the same end at which the current was injected; anddetermining, based on the detected amplitude, the location of the train on the track or of the broken rail of the track.