Railroad track geometry defect detector

• US 6,347,265 B1
• Filed: 06/15/2000
• Issued: 02/12/2002
• Est. Priority Date: 06/15/1999
• Status: Expired due to Term

• Current Assignee: Andian Technologies Ltd.
• Original Assignee: Andian Technologies Ltd.
• Inventors: Bidaud, Andre C.
• Primary Examiner(s): Zanelli, Michael J.
• Assistant Examiner(s): Gibson, Eric M
• Application Number:
  US09/594,286
• Time in Patent Office: 607 Days
• Field of Search: 701/19, 731/46
• US Class Current: 701/19
• CPC Class Codes: B61K 9/08 Measuring installations for surveying permanent way applications of measuring apparatus or devices for track building purposes E01B35/00; measuring techniques G01
• CPC Class Codes: B61L 2205/04 Satellite based navigation systems, e.g. global positioning system [GPS]
• CPC Class Codes: B61L 23/047 Track or rail movements
• CPC Class Codes: B61L 27/53 for trackside elements or systems, e.g. trackside supervision of trackside control system conditions

Abstract

A track analyzer included on a vehicle traveling on a track includes a vertical gyroscope for determining a grade and an elevation of the track. A rate gyroscope determines a curvature of the track. A speed determiner determines a speed of the vehicle relative to the track. A distance determiner determines a distance the vehicle has traveled along the track. A computing device, communicating with the vertical gyroscope, the rate gyroscope, the speed determiner, and the distance determiner, a) identifies a plurality of parameters as a function of the grade, elevation, and curvature of the track, b) determines in real-time if the parameters are within acceptable tolerances, and, c) if the parameters are not within the acceptable tolerances, generates corrective measures.

Claims

1. A track analyzer included on a vehicle traveling on a track, the track analyzer comprising:

a vertical gyroscope for determining a grade and an elevation of the track;

a rate gyroscope for determining a curvature of the track;

a speed determiner for determining a speed of the vehicle relative to the track;

a distance determiner for determining a distance the vehicle has traveled along the track; and

a computing device, communicating with the vertical gyroscope, the rate gyroscope, the speed determiner, and the distance determiner, for a) identifying a plurality of parameters as a function of the grade, elevation, and curvature of the track, b) determining in real-time if the parameters are within acceptable tolerances, and, c) if the parameters are not within the acceptable tolerances, generating corrective measures.

2. The track analyzer as set forth in claim 1, further including:

a video display device communicating with the computing device, the corrective measures including messages displayed on the video display device.

3. The track analyzer as set forth in claim 1, further including:

an analog-to-digital converter for converting analog signals from the vertical gyroscope, the rate gyroscope, the speed determiner, and the distance determiner into respective digital signals which are transmitted to the computing device.

4. The track analyzer as set forth in claim 1, wherein the vertical gyroscope includes:

an inner gimbal;

an outer gimbal; and

a spin motor creating an inertial force, the grade and the elevation of the track being determined by motions of the inner and outer gimbals against the inertial force.

5. The track analyzer as set forth in claim 4, wherein:

the inner gimbal determines the grade of the track; and

the outer gimbal determines the elevation of the track.

6. The track analyzer as set forth in claim 1, further including:

a look-up table, communicating with the computing device, for storing the acceptable tolerances.

7. The track analyzer as set forth in claim 6, wherein:

the acceptable tolerances identify urgent defects and priority defects;

the corrective measures include actions to be implemented substantially immediately for urgent defects; and

the corrective measures include actions to not be implemented substantially immediately for priority defects.

8. The track analyzer as set forth in claim 6, wherein the acceptable tolerances include curve elevation tolerances and maximum allowable runoff tolerances.

9. The track analyzer as set forth in claim 1, wherein the speed determiner includes:

a toothed gear having teeth passing a sensor for inducing a voltage in a coil, a frequency of the voltage being proportional to a speed of the vehicle relative to the track.

10. A method for analyzing a track on which a vehicle is traveling, comprising:

determining a grade and an elevation of the track;

determining a curvature of the track;

determining a speed of the vehicle relative to the track;

determining a distance the vehicle has traveled along the track;

identifying a plurality of parameters as a function of the grade, elevation, and curvature of the track;

determining in real-time if the parameters are within acceptable tolerances; and

if the parameters are not within the acceptable tolerances, generating corrective measures.

11. The method for analyzing a track on which a vehicle is traveling as set forth in claim 10, further including:

displaying the corrective measures on a video display device.

12. The method for analyzing a track on which a vehicle is traveling as set forth in claim 10, further including:

an inner gimbal for determining the grade;

an outer gimbal for determining the elevation; and

a spin motor creating an inertial force, the grade and the elevation of the track being determined by motions of the inner and outer gimbals against the inertial force.

13. The method for analyzing a track on which a vehicle is traveling as set forth in claim 10, further including:

accessing the acceptable tolerances from a look-up table.

14. The method for analyzing a track on which a vehicle is traveling as set forth in claim 13, wherein the acceptable tolerances identify urgent defects and priority defects, further including:

identifying the corrective measures as actions to be implemented substantially immediately for urgent defects; and

identifying the corrective measures as actions to not be implemented substantially immediately for priority defects.

15. The method for analyzing a track on which a vehicle is traveling as set forth in claim 13, wherein the step of accessing the acceptable tolerances includes:

accessing acceptable curve elevation tolerances and acceptable maximum allowable runoff tolerances.

16. The method for analyzing a track on which a vehicle is traveling as set forth in claim 10, wherein the step of determining the distance includes:

producing light from a first source;

passing the light through a plurality of slots in a first plate which rotates as a function of the distance the vehicle travels relative to the track, a spacing between the slots being known;

producing first electrical pulses when light from the first source passes through the slots and is received by a first detector; and

determining the distance the vehicle has traveled along the track as a function of a number of the first pulses received by the first detector.

17. The method for analyzing a track on which a vehicle is traveling as set forth in claim 16, further including:

producing light from a second source;

passing the light from the first and second sources through a plurality of slots in a the first plate and a second plate, respectively, which rotate as a function of the distance the vehicle travels relative to the track, the slots in the first plate being offset a predetermined amount from the slots in the second plate;

producing second electrical pulses when light from the second source passes through the slots and is received by a second detector; and

determining a direction the vehicle is traveling along the track as a function of the first and second electrical pulses.