Rail Vehicle Length Detection Using Trackside Reference Points
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Solution Overview
Problem
Existing methods for determining the length of track-bound vehicles are either cumbersome and prone to incorrect entries or do not support varying vehicle configurations, lacking an automated and reliable solution for railway signaling safety.
Innovation Solution
A method using detection devices at the front and rear of the vehicle to measure the distance between trackside reference points, allowing for automatic determination of vehicle length without manual input, utilizing odometry, radar, or satellite positioning, with beacon readers and control devices for precise distance calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual input by vehicle driver is used to enter vehicle length information, then the system can obtain vehicle length data, but the procedure becomes complex and prone to incorrect entries
Solution Approach 1:
The system automatically determines vehicle length using onboard sensors and odometry data without requiring manual driver input. The control device calculates length by detecting the distance between the vehicle and trackside reference points, eliminating human error and simplifying the process while maintaining high reliability
Solution Approach 2:
The manual mechanical input process is replaced with an automated electronic measurement system using odometry devices, radar, and satellite positioning to detect vehicle length automatically, substituting human operation with technological measurement
2Adaptability or versatility
If fixed configuration parameter is used for vehicle length, then the system is simple to operate, but different vehicle configurations cannot be supported
Solution Approach 1:
The system transitions from static fixed configuration parameters to dynamic automatic measurement. The control device continuously or periodically determines vehicle length based on actual position data from odometry and reference points, allowing the system to adapt to different vehicle configurations automatically without manual reconfiguration
Solution Approach 2:
The vehicle length parameter is no longer fixed but is dynamically determined through measurement. The system uses variable data from odometry devices and reference point detection to calculate length, enabling adaptation to different vehicle configurations while maintaining operational simplicity
3Measurement precision
If GPS-based multiple measurements and averaging is used to estimate train length, then automated measurement is achieved, but the measurement precision and reliability are reduced
Solution Approach 1:
Instead of using GPS coordinates as intermediaries which introduce accumulation errors, the system uses trackside reference points as precise intermediaries. The reference points provide fixed, known positions that serve as accurate markers for calculating vehicle length, improving measurement precision while maintaining automation
Solution Approach 2:
The measurement process is segmented into discrete detection events at specific reference points rather than continuous GPS tracking. By measuring the distance between the first and last detection events at known reference points, the system achieves higher precision without relying on multiple GPS measurements and averaging
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 reliable and automated determination of vehicle length, enhancing safety in railway signaling by eliminating the need for manual input and supporting various vehicle configurations, with improved accuracy and reduced operational effort.
Implementation Method 1
a first detection device of the track-bound vehicle, seen in the front in the direction of travel, and by means of a second detection device of the track-bound vehicle, seen in the rear of the track-bound vehicle
Implementation Method 2
by means of an odometry device on the vehicle, for example in the form of a distance encoder, a radar device and/or a device for satellite-supported determination of the position
Implementation Method 3
a radar device and/or a device for satellite-supported determination of the position of the track-bound vehicle
Implementation Method 4
a device for satellite-supported determination of the position of the track-bound vehicle
Data Source
Figure 1~2
AI summary
The present invention relates to a method for determining the length (L) of a railbound vehicle (10), said method allowing the length (L) of the railbound vehicle (10) to be determined in an automated, particularly reliable manner which can also be implemented with comparatively low outlay. To do this, the method according to the invention proceeds as follows: a line-side reference point (60) is detected by means of a first detection device (21), at the front of the railbound vehicle (10) as seen in the direction of travel (40); the line-side reference point (60) is detected by means of a second detection device (22), at the back of the railbound vehicle (10) as seen in the direction of travel (40); a distance (D) which is covered by the railbound vehicle (10) between the detection of the line-side reference point (60) by means of the first detection device (21) and the detection of the line-side reference point (60) by means of the second detection device (22) is established; and the length (L) of the railbound vehicle (10) is determined from the established distance (D). The invention also relates to an apparatus for determining the length (L) of a railbound vehicle (10).