Locomotive Switch Locking via Wireless Authorization
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Solution Overview
Problem
Current railway switch control systems face safety hazards and inefficiencies due to the need for long track circuits, which can cause derailments and increase installation and maintenance costs, while also limiting rail operations and not accurately alerting operators when switches are positioned or moved.
Innovation Solution
A computer-implemented switch locking method that allows an authorized locomotive to send a lock command to a switch controller, determining if a lock confirmation is received before safely traversing the switch, thereby preventing unsafe switch movements and external control until the locomotive has unlocked the switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If long track circuits are used to ensure switch cannot move in advance of train, then safety is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces the mechanical/electrical track circuit system with a wireless communication-based locking system. The locomotive's onboard system communicates with the switch controller via wireless signals to lock and unlock switches, eliminating the need for extensive physical track circuits while maintaining safety through electronic control and confirmation protocols.
2Reliability
If long track circuits are installed to prevent switch movement, then safety is improved, but installation and maintenance costs increase
Solution Approach 1:
The wireless communication system replaces expensive physical infrastructure (long track circuits) with software and communication protocols. This substitution dramatically reduces installation costs by eliminating extensive wiring and physical circuit installation, and maintenance costs by removing mechanical components that require upkeep.
3Reliability
If long track circuits are used to ensure safe switch traversal, then safety is improved, but rail operations efficiency decreases
Solution Approach 1:
The system dynamically locks and unlocks switches based on real-time locomotive position and authorization status. Rather than using fixed, long approach circuits that limit operations, the system adapts switch control to the actual operational needs, allowing more flexible and efficient rail operations while maintaining safety through dynamic authorization checks.
4Ease of operation
If dispatcher controls switch position changes, then centralized control is maintained, but response time and operational efficiency decrease
Solution Approach 1:
The system performs preliminary authorization checks and switch locking actions automatically based on pre-established safety criteria and locomotive authorization status. This eliminates the need for dispatcher intervention in routine switch operations, reducing response time while maintaining centralized safety oversight through the authorization framework.
Data Source
AI summary
A switch locking system and method of an authorized locomotive for safely traversing a switch in a railway including sending a lock command from a computer onboard the authorized locomotive to a switch controller associated with the switch; determining if a lock confirmation from the switch controller is received by the computer onboard the authorized locomotive; and safely traversing the switch upon receipt of the lock confirmation. The switch locking system and method may include sending an unlock command from a computer onboard the authorized locomotive to a switch controller after the train clears the switch.