Locator Loop Control System for Seamless Vehicle Failover
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Solution Overview
Problem
In vehicle guideway networks, the transition from primary to redundant control systems is often manual and disruptive, leading to unnecessary stops when primary communication fails, as vehicles lack automated mechanisms to seamlessly switch and maintain operation.
Innovation Solution
A locator loop control system that includes a vital on-board controller (VOBC) and a locator loop, enabling vehicles to automatically adjust speed and communicate with a wayside controller to maintain movement instructions even when primary communication is lost, using proximity plates and a polling system to ensure safe and continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual operation is used for redundant control system activation, then system complexity is reduced, but productivity decreases due to unnecessary stops and delays
Solution Approach 1:
The system performs preliminary actions by pre-configuring the redundant control system with necessary parameters and maintaining standby readiness before primary system failure occurs. The redundant system is pre-programmed with movement instructions and can immediately take over without requiring manual activation, thus maintaining productivity while keeping the overall system design relatively simple.
Solution Approach 2:
The redundant control system is designed to self-activate and self-manage when the primary system fails. It automatically detects the failure condition, takes control of the vehicle, and continues operation without requiring external manual intervention. This self-service capability eliminates unnecessary stops while maintaining reasonable system complexity through automated failover logic.
2Productivity
If automated speed adjustment is implemented, then productivity is improved by reducing stops, but device complexity increases due to additional control mechanisms
Solution Approach 1:
The redundant control system is designed with multi-functionality, serving both as a backup control system and an automated speed adjustment system. The same hardware and software infrastructure that provides redundancy also handles speed regulation and movement instruction execution, eliminating the need for separate automated speed control mechanisms and thereby avoiding additional complexity while maintaining productivity.
Solution Approach 2:
The locator loop and proximity plate serve as intermediaries between the control system and the vehicle's position/speed. These simple electromagnetic components provide continuous position feedback without requiring complex sensors or communication systems on the vehicle itself, enabling automated speed adjustment while keeping the overall system complexity manageable.
3Reliability
If continuous communication monitoring is implemented, then reliability is improved by enabling seamless failover, but use of energy increases due to constant polling
Solution Approach 1:
The system uses periodic polling at strategically chosen intervals rather than continuous monitoring. The locator loop polls the vehicle's status at regular intervals, and the proximity plate provides periodic position confirmation. This periodic action maintains reliable communication failover detection while significantly reducing energy consumption compared to continuous monitoring, as the system only activates communication functions when needed.
Solution Approach 2:
The system replaces complex continuous communication protocols with simpler electromagnetic induction-based locator loops and proximity plates. These passive electromagnetic components require minimal energy to operate compared to active communication systems, yet provide sufficient reliability for detecting communication failures and enabling seamless failover to the redundant control system.
Data Source
AI summary
A locator loop control system includes a guideway configured to define a travel path of a vehicle. The locator loop control system further includes a locator loop located along the guideway, the locator loop configured to exchange information with a vital on-board controller (VOBC) on-board the vehicle. The locator loop control system further includes a first proximity plate located along the guideway, the first proximity plate spaced a first distance along the guideway from the locator loop, and a wayside controller configured to communicate with the locator loop.