Vehicle Crossing Warning Timing Control

The patent segments the warning activation into two independent systems: (1) occupancy-based track circuits for reliable detection in electrified areas, and (2) predictor circuits for timing-based activation. The crossing activation is triggered by the earlier of the two systems, allowing each to operate in its optimal environment while their outputs are coordinated through a common control logic that prevents excessive delay.

The patent introduces a mediator logic layer that receives inputs from both occupancy-based and predictor-based systems. This intermediary control logic processes both signals and determines the optimal activation time, ensuring that the crossing is activated early enough for safety but not excessively early causing unnecessary delay. The mediator coordinates the two different detection approaches and outputs a unified control signal.

The patent divides the detection system into two separate circuits with distinct functions: predictor circuits handle timing-based detection in areas with low electrical interference, while occupancy-based circuits provide reliable detection in electrified areas. Each circuit operates independently in its optimal environment, and their outputs are integrated through mediator logic that selects the appropriate activation time based on local conditions.

The patent creates a universal crossing control system that can operate in multiple environments (electrified and non-electrified areas) by incorporating both predictor and occupancy-based detection methods. The system automatically adapts to local conditions and uses the most reliable detection method available at each location, making the overall system universally applicable across different railway environments.

The patent makes the crossing activation timing dynamic rather than static. Instead of using a fixed advance warning time, the system continuously adjusts the activation time based on real-time vehicle position, speed, and detected arrival time. The mediator logic dynamically calculates the optimal activation moment that accounts for communication delays while minimizing unnecessary wait time, creating a responsive system that adapts to actual traffic conditions.

The patent implements feedback mechanisms where the system continuously monitors vehicle approach and adjusts activation timing accordingly. The predictor circuit provides feedback on estimated arrival time, which feeds back to the mediator logic to refine the activation decision. This closed-loop feedback ensures that the crossing is activated at the optimal moment, accounting for communication delays without causing excessive wait times.