Vehicle Sub-Route Identification Using Wayside Transponders
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Solution Overview
Problem
Current vehicle location systems, such as Positive Train Control (PTC) systems, face challenges in accurately determining the specific track or sub-route a vehicle is traveling on, especially due to the close proximity of tracks and the limitations of Global Positioning System (GPS) accuracy, leading to potential safety issues and increased maintenance costs.
Innovation Solution
A system comprising a communication module onboard the vehicle and a determination module that receives route occupancy information from a wayside module, using onboard detection units to compare position information with occupancy information to accurately identify the sub-route, potentially requesting additional information and autonomously adjusting vehicle control to ensure accurate tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If GPS is used for vehicle location determination, then the system is simple and low-cost, but the positioning accuracy is insufficient to distinguish between closely spaced tracks
Solution Approach 1:
The patent introduces an intermediary system consisting of wayside transponders and onboard antennas that mediate between the vehicle and the track identification system. The transponders are placed at specific locations along the route and provide unique identification signals that the onboard system detects and processes to determine track location, thereby achieving high accuracy without complex GPS augmentation
Solution Approach 2:
The patent creates a simplified copy of the track identification function through onboard detection units that receive and process signals from wayside transponders. Instead of using complex augmented GPS systems, the invention copies the essential identification function through a dedicated, simpler signaling system that provides sufficient accuracy for track determination
2Reliability
If manual track entry by operator is used, then the system remains simple, but safety is compromised due to potential human error
Solution Approach 1:
The system enables automatic track identification through self-service mechanisms where the vehicle's onboard detection units automatically detect and process signals from wayside transponders without requiring operator intervention. The system autonomously determines track location and provides this information to the control system, eliminating human error while maintaining simplicity
Solution Approach 2:
The patent implements a feedback mechanism where the onboard system continuously monitors for transponder signals and automatically updates track identification based on detected signals. This automated feedback loop ensures accurate, real-time track identification without relying on manual operator input, thereby improving safety while maintaining system simplicity
3Measurement precision
If cab signal systems with transmitters are used, then track identification capability is provided, but energy consumption is high and infrastructure cost is prohibitive
Solution Approach 1:
The patent employs periodic action by placing transponders at specific intervals along the route rather than continuous signaling. The onboard system detects these periodic signals as the vehicle passes each transponder location, enabling accurate track identification through discrete, low-energy signals instead of continuous high-energy transmission
Solution Approach 2:
The patent uses simple, low-cost transponder devices that can be easily deployed and replaced along the route. These transponders are inexpensive compared to continuous transmission systems, and the system achieves accurate track identification through a series of simple, discrete signaling points rather than expensive continuous infrastructure
4Measurement precision
If RFID tags are used for track identification, then the system provides track location data, but maintenance costs increase due to exposure and battery requirements
Solution Approach 1:
The patent uses simple, robust transponder devices that are inexpensive and can be easily replaced if needed. These transponders are designed to be durable and require no maintenance, contrasting with RFID tags that require battery replacement and are susceptible to environmental damage. The low cost enables deployment in protective infrastructure locations rather than exposed positions
Data Source
AI summary
A system includes a communication module and a determination module. The communication module is configured to be located onboard a vehicle configured to travel along a route including plural sub-routes. The communication module is configured to receive route occupancy information from an off-board wayside module disposed along the route. The route occupancy information corresponds to a presence or absence of vehicular traffic on each sub-route within a range of a route detection system operably coupled to the wayside module. The determination module is configured to be located onboard the vehicle, and to obtain position information from one or more onboard detection units disposed onboard the vehicle. The determination module is configured to determine a particular sub-route on which the vehicle is disposed using a comparison of the position information obtained from the one or more onboard detection units and the occupancy information received from the off-board wayside module.