Apparatus and methods for providing relatively constant...

Details Apparatus and methods for providing relatively constant... Apparatus and methods for providing relatively constant...

2005-10-14

2009-08-18

Le, Mark T (Department: 3617)

Railway switches and signals

Vehicle-energy actuation

Signals and gates, automatic

C246S111000, C246S125000, C246S126000, C246S473100

Reexamination Certificate

active

07575202

ABSTRACT:
Apparatus, methods and a communication system for providing relatively constant warning time at a rail grade crossing for trains with prediction of the approach of a train from a remote controller via rail-based communications to a crossing controller. A first communication signal is generated when a prediction occurs and a second communication signal is generated for slower moving trains, with the second signal temporarily overriding the first signal to provide relatively constant warning time at the crossing. Cancellation timers with timing intervals are used to resolve situations where the train does not enter the approach or where the train leaves by way of a switch or backs out. Directional logic is used to determine the direction of movement of the train and, in conjunction with cancellation timers, causes the warning devices to be activated when the timers expire.

REFERENCES:
patent: 6830224 (2004-12-01), Lewin et al.
Invensys—Application Guidelines, Microprocessor Based Grade Crossing Predictor Model 3000 Family.
Safetran Systems Corporation, Instruction & Installation, Solid-State Crossing Controller III Plus (SSCC III Plus) 91190, 91195, Apr. 2004, Document No. SIG-00-02-03, Version D.
Safetran Systems Corporation, Instructions & Installation, Microprocessor Based Grade Crossing Predictor Mode; 3000 Family, Apr. 2002, Document No. SIG-00-00-02, Version B.

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