Railway switches and signals – Block-signal systems – Automatic
Patent
1997-05-14
1998-06-23
Morano, S. Joseph
Railway switches and signals
Block-signal systems
Automatic
246121, B61L 2304
Patent
active
057693641
ABSTRACT:
A track circuit with diagnostic capability differentiates between an occupied track circuit and one in which a conductor of the track circuit (one of the rails) is broken. Transceiver units are provided at the respective ends of the track circuit and operate alternately in transmit and receive modes. The applied voltage and current are measured at the transmitting unit, and the received voltage and current are sensed and measured at the receiving unit. From these measurements made successively as the units alternately transmit and receive, each unit can determine whether the track is available or unavailable and, if unavailable, whether the track has a broken rail. A microprocessor in each unit distinguishes a broken rail from an occupied track when an increase in the applied transmitting voltage at the unit occurs simultaneously with a decrease in each of the other voltage and current measurements.
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Harmon Industries, Inc.
Morano S. Joseph
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