TRAIN SPEED MEASURING DEVICE AND METHOD

• US 20130103225A1
• Filed: 10/16/2012
• Published: 04/25/2013
• Est. Priority Date: 10/19/2011
• Status: Active Grant

• Current Assignee: LSIS Co. Ltd. (LS Corporation)
• Original Assignee: LSIS Co. Ltd. (LS Corporation)
• Inventors: HAN, JAE MUN, KIM, SEOK HEON
• Granted Patent: US 9,102,239 B2
• Time in Patent Office: Days
• US Class Current: 701/1
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/461 Speed
• CPC Class Codes: B60L 2240/465 Slip
• CPC Class Codes: B60L 3/08 Means for preventing excessive speed of the vehicle
• CPC Class Codes: B60L 3/102 of individual wheels
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/10 using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
• CPC Class Codes: G01P 11/00 Measuring average value of speed by determining time taken to traverse a fixed distance G01P3/64, G01P5/18
• CPC Class Codes: G01P 3/56 for comparing two speeds
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

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.

Claims

1. A train speed measuring device comprising:

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.

2. The train speed measuring device according to claim 1, wherein the speed calculating unit receives the speed values, calculates a first speed of the trailer car and a second speed of the motor car, and calculates a train speed on the basis of the first speed when a deviation between the first speed and the second speed is greater than a critical value.

3. The train speed measuring device according to claim 1, wherein the speed calculating unit comprises:

a first speed calculating unit for receiving a speed from the at least one first speed measuring unit and calculating a first speed of the trailer car;

a second calculating unit for receiving a speed from the at least one first speed measuring unit and calculating a second speed of the motor car; and

a speed determining unit for comparing the first speed with the second speed, and determining a train speed on the basis of the first speed when a deviation between the first speed and the second speed is greater than a critical value.

4. The train speed measuring device according to claim 3, wherein, when a deviation between speeds received from the at least one first speed measuring unit is greater than a critical value, the first speed calculating unit compares speeds received from the at least one first speed measuring unit with the second speed and calculates the first speed.

5. The train speed measuring device according to claim 3, wherein, when a deviation between speeds received from the at least one first speed measuring unit is less than a critical value, the first speed calculating unit calculates a first speed on the basis of an average value of speeds received from the at least one first speed measuring unit.

6. The train speed measuring device according to claim 3, wherein, when a deviation between speeds received from the at least one second speed measuring unit is greater than a critical value, the second speed calculating unit compares speeds received from the at least one second speed measuring unit with the first speed and calculates the second speed.

7. The train speed measuring device according to claim 3, wherein, when a deviation between speeds received from the at least one second speed measuring unit is less than a critical value, the second speed calculating unit calculates a second speed on the basis of an average value of speeds received from the second speed measuring unit.

8. The train speed measuring device according to claim 1, further comprising a distance calculating unit for receiving the speed of the train from the speed calculating unit and calculating a travelling distance of the train according to time.

9. The train speed measuring device according to claim 1, wherein the speed calculating unit receives the speed value through a series communication line connected between the motor car and the trailer car.

10. A train speed measuring method, comprising:

receiving a pulse signal according to a wheel revolution from at least one tachometer disposed at each axle of a motor car and a trailer car of a train;

measuring a speed from the pulse signal and determining the speed of the motor car and the trailer car; and

calculating the speed of the train on the basis of the determined speed of the motor car and the trailer car.

11. The method according to claim 10, wherein the calculating of the train speed comprises calculating a train speed on the basis of the speed of the trailer car when a deviation between the speed of the motor car and the speed of the trailer car is greater than a critical value.

12. The method according to claim 10, wherein the determining of the speeds of the motor car and the trailer car comprises:

measuring each speed by receiving a pulse signal from the at least one first and second tachometers; and

calculating a first speed of the trailer car and a second speed of the motor car from the measured each speed, and

the calculating of the speed of the train comprises;

comparing the first speed with the second speed; and

calculating a train speed on the basis of the first speed when a deviation between the speeds is greater than a critical value.

13. The method according to claim 12, wherein the calculating of the first speed and the second speed comprises:

when a deviation between each speed measured from a pulse signal received from the first tachometer is greater than a critical value, comparing the each speed with the second speed and calculating the first speed.

14. The method according to claim 12, wherein the calculating of the first speed and the second speed comprises:

when a deviation between each speed measured from the at least one first tachometer is less than a critical value, calculating the first speed on the basis of an average value of the each speed.

15. The method according to claim 12, wherein the calculating of the first speed and the second speed comprises, when a deviation between each speed measured from the at least one second tachometer is greater than a critical value, comparing the each speed with the first speed and calculating the second speed.

16. The method according to claim 12, wherein the calculating of the first speed and the second speed comprises, when a deviation between each speed measured from a pulse signal received from the at least one second tachometer is less than a critical value, calculating the second sped on the basis of an average value of the each speed.

17. The method according to claim 10, further comprising:

calculating a travelling distance of the train according to time and outputting the calculated travelling distance.

18. The method according to claim 10, wherein the receiving of the pulse signal comprises receiving the pulse signal through a series communication line connected between the motor car and the trailer car.