Dynamic Train-to-Rail Shunting Detection Using Sensor Plates
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Solution Overview
Problem
Current constant warning time devices struggle to accurately detect the dynamic train-to-rail shunting performance, particularly for newer, faster, and lighter passenger trains, which do not present a standard 0.06 ohm shunt, leading to potential failures in activating crossing warning devices in a timely manner.
Innovation Solution
A portable system comprising sensor plates connected to the rails and high-speed digital cameras, along with a recording ohmmeter, to measure and capture the dynamic shunting performance of trains as they move, allowing for accurate determination of the effective shunt value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant warning time devices use standard 0.06 ohm shunt values for detection, then the devices can reliably detect standard freight trains, but they fail to accurately detect newer, faster, and lighter passenger trains which present different effective shunt values
Solution Approach 1:
The patent applies dynamics by transitioning from static, fixed shunt value assumptions to dynamic, real-time measurement of actual shunt values. The system continuously measures the effective shunt value presented by each approaching train using sensor plates and ohmmeters, allowing the crossing warning device to adapt its detection parameters dynamically rather than relying on predetermined standard values for different train types.
Solution Approach 2:
The patent implements parameter changes by measuring and using the actual effective shunt value parameter for each train instead of assuming standard values. The system changes the detection parameter from fixed theoretical shunt values (0.06 ohm standard) to measured actual shunt values, which vary based on train composition, speed, weight, and rail contact conditions specific to each train type.
2Ease of operation
If constant warning time devices are configured to activate warning devices at a fixed time prior to train arrival, then the system is simple to operate, but it cannot accurately accommodate varying train speeds and distances
Solution Approach 1:
The patent applies feedback by using real-time measurements of train position, speed, and effective shunt value to continuously update the warning timing calculations. The system measures actual train parameters and feeds this information back to adjust the warning activation timing, replacing fixed time intervals with dynamically calculated timing based on current train conditions and predicted arrival time.
3Reliability
If the rail surface becomes contaminated with lubricants and dirt from modern railroad operations, then wheel and rail wear is reduced, but the train-to-rail shunting performance becomes unpredictable and non-standard
Solution Approach 1:
The patent implements self-service by having the system automatically measure and adapt to the actual shunt value presented by each train-rail interaction without requiring manual calibration or adjustment. The sensor plates and ohmmeters continuously self-calibrate by measuring the effective shunt value under current rail contamination conditions, allowing the system to automatically compensate for varying rail surface conditions caused by lubricants and dirt.
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 detection of dynamic train-to-rail shunting performance, optimizing the operation of crossing warning devices and reducing the likelihood of field failures by accounting for varying shunt values across different train types and conditions.
Implementation Method 1
a transmitter that transmits a signal over a circuit formed by the track's rails
Implementation Method 2
detect a train and determine its distance and speed by measuring impedance changes caused by the train's wheels and axles acting as a shunt across the rails
Implementation Method 3
the train's wheels and axles acting as a shunt across the rails, which effectively shortens the length (and hence lowers the impedance) of the rails in the circuit
Data Source
AI summary
Systems and methods for detecting the dynamic train-to-rail shunting performance of a train as it is moving along the rails of a railroad track. The systems and methods use portable equipment temporarily installed at a site where it is desired to test the shunting of one or more trains or the electrical equipment installed at the track. The systems and method use sensor plates and a high speed recording system to simultaneously capture measured train-to-rail shunting characteristics and the positioning of a train's axles and any rail conditions impacting the measurements. The captured information can be used to fine tune the train, the electrical equipment installed at the track and/or to design new devices.