Wayside Signal Flash Control via Audio Modulation
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Solution Overview
Problem
Existing wayside signaling systems for grade crossings are costly due to extensive cabling requirements and are susceptible to common mode failures, as control systems are complex and centralized, leading to inefficiencies and reliability issues.
Innovation Solution
A signaling system where signal lights are electrically connected to a control device via conductive cables, with integrated flash control electronics that respond to audio signals, allowing for decentralized operation and fail-safe modes, reducing cabling and complexity by using audio signals over existing power cables to control LED lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If extensive cabling is used to connect signal lights to the control house, then reliable control can be achieved, but installation cost and labor burden increase significantly
Solution Approach 1:
The patent replaces the mechanical/electrical control system with audio frequency signal transmission over existing power cables. Instead of using separate control cables or complex wiring, the system modulates control signals onto the existing 12VDC power cable using audio frequency modulation, eliminating the need for extensive additional cabling while maintaining control reliability
Solution Approach 2:
The existing power cable is made multi-functional by using it for both power delivery and control signal transmission. The system modulates audio frequency control signals onto the 12VDC power cable, allowing a single cable to serve dual purposes: providing power to the LED signal lights and transmitting control commands, thereby eliminating the need for separate control cabling
2Device complexity
If control systems are centralized in one device, then system complexity is reduced, but the system becomes susceptible to common mode failure
Solution Approach 1:
The patent segments the control function by distributing intelligence to individual lamp assemblies rather than centralizing it. Each LED lamp assembly contains its own control circuitry that can independently interpret audio frequency signals and control its flashing behavior. This segmentation eliminates single points of failure while maintaining relatively simple overall system architecture
Solution Approach 2:
Each LED lamp assembly is made self-sufficient with integrated control electronics that can autonomously respond to audio frequency signals. The lamps self-regulate their flashing patterns based on the modulated signals received over the power cable, without requiring centralized control logic, thereby improving reliability while keeping individual components simple
3Ease of operation
If separate control cables are installed for each signal light, then precise control is achieved, but installation labor and cost increase
Solution Approach 1:
The system makes the existing power cable multi-functional by superimposing audio frequency control signals onto the 12VDC power transmission. This allows the same cable infrastructure to handle both power delivery and precise control signaling, eliminating the need for separate control cables and significantly reducing installation time and labor costs while maintaining control precision
Data Source
AI summary
A system includes at least one signal light having at least one lamp. The system further includes a control device electrically connected to the at least one lamp by a conductive cable. The at least one lamp is configured to flash in response to the loss of an audio signal generated by the control device.