Rail Track Circuit State Detection Using Adaptive Current Thresholds
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Solution Overview
Problem
Existing track circuits struggle to reliably determine the occupancy status of railroad track sections due to varying resistance and current changes caused by weather conditions, rail material characteristics, and broken rails, leading to inaccurate and unsafe train control.
Innovation Solution
A method and apparatus that utilize a computing unit to monitor relative changes in current intensity, comparing them against a flexible threshold to adaptively determine the state of a track section, distinguishing between occupied and unoccupied states, and identifying broken rails, using a first and second track device to measure and apply voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed threshold is used to determine occupancy status, then the determination process is simple, but the reliability is poor due to varying resistance and current changes
Solution Approach 1:
The patent implements dynamic threshold adjustment by continuously monitoring the received current and adapting the threshold based on actual track conditions. Instead of using a fixed threshold, the system dynamically calculates thresholds based on measured current values, allowing the determination process to adapt to varying resistance and current changes while maintaining reliability.
Solution Approach 2:
The system employs feedback mechanisms by continuously measuring the received current and using this information to adjust the threshold dynamically. The feedback loop compares the received current against dynamically adjusted thresholds and uses the results to refine future determinations, ensuring reliable occupancy status detection despite environmental variations.
2Measurement precision
If additional monitoring equipment is deployed to improve detection accuracy, then the measurement precision improves, but the device complexity and cost increase
Solution Approach 1:
The patent makes the existing track circuit equipment multi-functional by enabling it to perform both traditional occupancy detection and broken rail detection. The same receiving devices used for determining train presence are also utilized to detect rail breaks through analysis of current characteristics, eliminating the need for separate monitoring equipment while improving measurement precision.
Solution Approach 2:
The system enables existing track circuit infrastructure to self-diagnose rail conditions by analyzing current measurements already being taken for occupancy detection. The receiving devices automatically detect broken rails by identifying characteristic current patterns, allowing the system to monitor multiple track conditions without additional specialized equipment.
3Device complexity
If traditional track circuits are used to detect occupancy, then the device complexity is low, but the ability to distinguish between occupied and broken rail states is insufficient
Solution Approach 1:
The patent adds a new dimension of analysis by examining both the magnitude and temporal characteristics of received current in addition to traditional occupancy detection. By analyzing current trends, rates of change, and patterns over time, the system can distinguish between normal occupancy conditions and broken rail scenarios using the same simple track circuit hardware.
Solution Approach 2:
The system distinguishes between different track states by monitoring changes in current parameters such as magnitude, rate of change, and temporal patterns. By analyzing multiple parameters of the received current rather than relying on a single threshold, the system can differentiate between train occupancy and broken rail conditions while maintaining simple track circuit configuration.
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, flexible, and cost-effective determination of track section states, reducing the need for additional equipment and infrastructure, while accurately differentiating between train presence and broken rails.
Implementation Method 1
the first track device applies a voltage to the first end and measures a transmitted current intensity transmitted by the first track device along the rails of the track section towards the second end
Implementation Method 2
at least one of the first track device and the second track device, called receiving track device, measures a received current intensity at a receiving end
Data Source
AI summary
A method determines a change of a state of a track section of a railroad. The track section includes a first end electrically connected to a first track device, a second end electrically connected to a second track device, and rails connecting the first end with the second end. The track section is associated with at least one computing unit. At least one of the first and second track devices is in communication with the computing unit. Upon initialization of the method, the state of the track section is a first predetermined state. At least one of the first track device and the second track device is a receiving track device, which measures a received current intensity at a receiving end. The method includes a first monitoring of the received current intensity and a second monitoring of a transmitted current intensity.