Train speed measuring device and method
First Claim
1. A device for determining speed of a train, the device comprising:
- a plurality of first tachometers each located at an axle of a trailer car of the train and configured to output pulse signals according to a wheel revolution of the trailer car;
a plurality of second tachometers each located at an axle of a motor car of the train and configured to output pulse signals according to a wheel revolution of the motor car;
at least one first speed measuring unit configured to receive a first speed value from each of the plurality of first tachometers;
at least one second speed measuring unit configured to receive a second speed value from each of the plurality of second tachometers;
a first speed calculating unit configured to receive a plurality of first speed values from the at least one first speed measuring unit and to calculate an average value of the received plurality of first speed values in order to determine a first speed; and
a second speed calculating unit configured to;
receive a plurality of second speed values from the at least one second speed measuring unit;
determine whether a deviation between the received plurality of second speed values is greater than a critical value; and
determine the speed of the train based on the determined first speed when the determined deviation between the received plurality of second speed values is greater than the critical value.
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Accused Products
Abstract
Provided are a train speed measuring device and method. The train speed measuring device includes: at least one first tachometer disposed at an axle of a trailer car and for outputting a pulse signal according to a wheel revolution of the trailer car; at least one second tachometer disposed at an axle of a motor car and for outputting a pulse signal according to a wheel revolution of the motor car; at least one speed measuring unit for measuring speed values on the basis of pulse signals outputted from the at least one first tachometer and the at least one second tachometer; and a speed calculating unit for calculating the speed of the train on the basis of the measured speed values.
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Citations
14 Claims
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1. A device for determining speed of a train, the device comprising:
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a plurality of first tachometers each located at an axle of a trailer car of the train and configured to output pulse signals according to a wheel revolution of the trailer car; a plurality of second tachometers each located at an axle of a motor car of the train and configured to output pulse signals according to a wheel revolution of the motor car; at least one first speed measuring unit configured to receive a first speed value from each of the plurality of first tachometers; at least one second speed measuring unit configured to receive a second speed value from each of the plurality of second tachometers; a first speed calculating unit configured to receive a plurality of first speed values from the at least one first speed measuring unit and to calculate an average value of the received plurality of first speed values in order to determine a first speed; and a second speed calculating unit configured to; receive a plurality of second speed values from the at least one second speed measuring unit; determine whether a deviation between the received plurality of second speed values is greater than a critical value; and determine the speed of the train based on the determined first speed when the determined deviation between the received plurality of second speed values is greater than the critical value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for determining speed of a train, the method comprising:
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receiving a first speed value according to a wheel revolution output from each of a plurality of first tachometers each located at each axle of a motor car of the train; receiving a second speed value according to a wheel revolution output from each of a plurality of second tachometers each located at each axle of a trailer car of the train; calculating an average value of a received plurality of first speed values in order to determine a first speed; determining whether a deviation between the received plurality of second first speed values is greater than a critical value; and determining the speed of the train based on the determined first speed when the determined deviation between the received plurality of second speed values is greater than the critical value. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification