Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1992-10-21
1994-12-27
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340669, 340683, 34087030, 33366, 73651, 246167R, 246182R, 310318, G08B 2100, G08C 1900, B61L 300, G01D 1800
Patent
active
053769252
ABSTRACT:
Motion and direction sensors for end of train (EOT) telemetry equipment employ a piezoelectric film as the sensing element. The motion sensor has a mechanical design which is optimized for detecting vibration on a railroad car. The electrical circuitry of the motion sensor generates output pulses to the EOT microprocessor which are processed according to an algorithm to make a determination of train motion based on detected vibration levels and rates of occurrence. Also, the EOT microprocessor dynamically adjusts the sensitivity of the motion sensor as a function of detected motion. The direction sensor uses a pendulum aligned with the axis of train motion to stress the piezoelectric film and, like the motion sensor, generates output pulses to the EOT microprocessor. These pulses are processed by a direction sensing algorithm implemented on the EOT microprocessor to determine the direction of train motion.
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Crisafulli Donald M.
Grama Jayaram A.
Peng John K.
Pulse Electronics, Inc.
Wu Daniel J.
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