B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/53
B61L 1/18 (2006.01) B61L 29/28 (2006.01)
Patent
CA 1108277
HIGHWAY CROSSING SYSTEM WITH IMPROVED MOTION DETECTING APPARATUS Abstract of the Disclosure A highway crossing warning system includes a motion detector transmitter and receiver respectively coupled to the track rails adjacent the highway crossing for detect- ing motion of an approaching train. Wrap-around approach sections initiate operation of the highway crossing warning, but once motion is detected, the motion detector can serve to inhibit the highway crossing warning, after a predeter- mined delay, if motion indication ceases. To increase the effectiveness of the motion detector, the motion detector transmitter impresses a modulated carrier onto the track rails, wherein the modulation is phase locked to the carrier. The receiver, tuned to the carrier frequency, detects the modulation, and then determines from the level of demodu- lated signal whether or not approaching motion is detected. The transmitter employs solid state circuits switched between saturated and off conditions to prevent circuit component failures from masking approach motion. The ring sustain time period is arranged to provide a minimum con- stant warning time regardless of changes in train velocity, so long as train velocity is maintained above a predeter- mined threshold within a predetermined distance from the crossing.
299123
Parker John W.
Svet Frank A.
Borden Ladner Gervais Llp
General Signal Corporation
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