Railway Wayside Communication Modulating Speed Profiles
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Solution Overview
Problem
Current wayside to railway vehicle communication methods are limited to transmitting only one speed limit along a railway track section, leading to unnecessary delays due to the inability to communicate varying speed limits for different track portions, such as rectilinear and bended sections.
Innovation Solution
A communication method that transmits up to 44 bits of data, allowing for multiple speed limits and complex speed profiles by using modulated messages with specific data structures, such as Block ID, Block Speed, and Work Zone information, enabling the railway vehicle to adjust its speed according to different sections of the track.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single code is transmitted through the rail to communicate speed limits to the railway vehicle, then the communication system is simple and reliable, but only one speed limit can be communicated, causing unnecessary delays when the vehicle must maintain the slowest speed limit throughout the entire track section
Solution Approach 1:
The track section is divided into multiple segments or blocks, each with its own speed limit. The communication system transmits multiple codes corresponding to different segments, allowing the railway vehicle to receive differentiated speed limit information for each segment rather than a single unified speed limit for the entire track section.
Solution Approach 2:
The system adds the dimension of spatial segmentation by introducing block identifiers that indicate different portions of the track. This allows speed limit information to be differentiated along the track length, transforming the single-dimension communication into a multi-dimensional system that conveys both speed limit values and their corresponding spatial locations.
2Loss of information
If the code is repeated for the entire duration the railway vehicle is on a track section, then the communication is simple and continuous, but the railway vehicle cannot access different speed limits for different portions of the track section
Solution Approach 1:
The continuous code transmission is segmented into multiple distinct codes, each representing a specific block or portion of the track section. This segmentation allows the railway vehicle to receive location-specific speed limit information for different segments rather than a single repeated code for the entire section.
Solution Approach 2:
The communication system transitions from a static, repeated code to a dynamic sequence of codes that change as the railway vehicle progresses through different blocks. Each code is transmitted at the appropriate time and location, providing real-time, location-specific speed limit information that adapts to the vehicle's position on the track.
3Quantity of substance
If only 5 bits of information are transmitted per code, then the signal bandwidth is very low and the system is simple, but the system can only communicate one speed limit with 32 possible code variants
Solution Approach 1:
The information transmission is segmented into multiple separate code transmissions rather than attempting to encode all information in a single code. Each code transmission maintains the simple 5-bit structure, but the sequence of multiple codes collectively conveys comprehensive speed limit information for different track segments.
Solution Approach 2:
The system uses periodic code transmissions at different locations along the track, with each transmission providing speed limit information for a specific block. This periodic repetition of simple codes at strategically located points enables the accumulation of comprehensive speed limit data without requiring complex high-bandwidth transmission.
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 more efficient communication of speed limits, reducing unnecessary delays by allowing different speed limits for various track sections, improving spectral efficiency, and supporting longer rail sections without interference.
Implementation Method 1
providing a transmitter device with a first wayside device arranged to put an electrical signal into a rail, the electrical signal containing information representative of multiple speed limits; modulating a waveform to encode the multiple speed limits; transmitting the modulated waveform through the rail using the transmitter device
Data Source
AI summary
A wayside to railway vehicle communication method including providing a first wayside device with a transmitter device capable of transmitting a data packet message to a railway vehicle travelling along a section of a railway track, through an electric waveform put into a rail of the section, and sending at least one message from the transmitter device to the railway vehicle, wherein the at least one message corresponds to the conversion of the data packet into a modulated electric waveform, the data packet including several data bits providing information relative to a plurality of speed limits the railway vehicle has to respect while travelling along respective portions of the section.