Electromagnetic system for railroad track crack detection and traction enhancement

• US 6,262,573 B1
• Filed: 09/17/1999
• Issued: 07/17/2001
• Est. Priority Date: 09/17/1999
• Status: Expired due to Fees

• Current Assignee: GE Global Sourcing LLC (Westinghouse Air Brake Technologies Corporation)
• Original Assignee: General Electric Company
• Inventors: Welles, Kenneth Brakeley II, Wojnarowski, Robert John, Kornrumpf, William Paul
• Primary Examiner(s): Patidar, Jay
• Assistant Examiner(s): AURORA, REENA
• Application Number:
  US09/397,839
• Time in Patent Office: 669 Days
• Field of Search: 324/217, 324/218, 324/228, 324/219, 324/226, 324/232, 324/233, 324/234, 324/236, 324/237, 324/239, 324/240, 324/242, 324/243, 324/260, 324/262, 246/122.R, 246/121, 246/168.1
• US Class Current: 324/217
• CPC Class Codes: B61K 9/10 for detecting cracks in rails or welds thereof
• CPC Class Codes: B61L 2205/04 Satellite based navigation systems, e.g. global positioning system [GPS]
• CPC Class Codes: B61L 23/044 Broken rails
• CPC Class Codes: B61L 25/025 Absolute localisation, e.g. providing geodetic coordinates
• CPC Class Codes: B61L 3/121 using magnetic induction
• CPC Class Codes: G01M 5/0025 of elongated objects, e.g. pipes, masts, towers or railways G01M5/0058 takes precedence
• CPC Class Codes: G01M 5/0033 by determining damage, crack or wear
• CPC Class Codes: G01M 5/0091 by using electromagnetic excitation or detection
• CPC Class Codes: G01N 27/82 for investigating the presence of flaws

Abstract

An electromagnetic system for detecting cracked rail and enhancing traction when necessary, includes wiring coils around wheel axles, and a corresponding power source for supplying power to the coils for producing electromagnetic flux. The produced electromagnetic flux is routed through the wheel axles, wheels and rails in a closed circuit. When a cracked rail is encountered along the route, the circuit will be interrupted or open, resulting in a changed flux pattern. This pattern change is detected by a flux sensor, and the geographic location of the crack in the rail is determined. The electromagnetic system further includes an electromagnetic wheel loading means for generating an attraction to the rails. The generated attraction to the rails increases friction between the wheels and the rails, thereby increasing traction to enable hauling greater loads up steep grades.

Claims

1. An electromagnetic system for railroad track crack detection and traction enhancement adapted to be carried aboard a rail vehicle, said system comprising:

first and second wheel axles;

a first pair of wheels supported on said first axle;

a second pair of wheels supported on said second axle;

a first one of the wheels of said first and second pairs being adapted to contact a first rail of said railroad track;

a second one of the wheels of said first and second pairs being adapted to contact a second rail of said railroad track;

a first wiring coil wound on the first one of said axles;

a second wiring coil wound on the second one of said axles;

a power source coupled to each of said wiring coils for supplying power to produce electromagnetic flux in a magnetic circuit comprising

(a.) said first pair of wheels and said first axle,

(b.) said first rail,

(c.) said second pair of wheels and said second axle, and

(d.) said second rail; and

a magnetic flux sensor for monitoring a flux pattern produced by said magnetic circuit and for generating an output indication if the flux pattern varies.

2. The electromagnetic system of claim 1 wherein said wiring coils are phased to induce opposite magnetic north-south pole pairs in each of said wheel axles and to induce opposite magnetic north-south pole pairs in each of said first one of the wheels of said first and second parirs.

3. The electromagnetic system of claim 2 further comprising means for geographically locating a position where said flux pattern is detected to vary.

4. The electromagnetic system of claim 3 wherein said means for geographically locating a position is a Global Positioning System (GPS).

5. The electromagnetic system of claim 1 further comprising electromagnetic wheel loading means coupled to said power source, for generating an artificial load imposed by said vehicle on said railroad track.

6. The electromagnetic system of claim 5 wherein said power source comprises a generator driven by rotation of a wheel on said railroad track.

7. The electromagnetic system of claim 5 wherein said wheel loading means comprises an electromagnet.

8. The electromagnetic system of claim 5 wherein said power source comprises a generator driven by a locomotive prime mover.

9. The electromagnetic system of claim 1 further comprising means for geographically locating a position where said flux pattern is detected to vary.

10. The electromagnetic system of claim 9 wherein said means for geographically locating a position is a Global Positioning System (GPS).

11. The electromagnetic system of claim 1 wherein said power source comprises a generator driven by rotation of a wheel on said railroad track.

12. The electromagnetic system of claim 1 wherein said power source comprises a generator driven by a locomotive prime mover.

13. An electromagnetic system for railroad track crack detection and traction enhancement adapted to be carried aboard a railroad locomotive, said system comprising:

first and second wheel axles;

a first pair of wheels supported on said first axle;

a second pair of wheels supported on said second axle;

a power source included on said locomotive;

electromagnetic wheel loading means coupled to said power source, for generating an artificial load imposed by said locomotive road track; and

a control circuit for providing power from said power source to said wheel loading means when wheel slippage is detected during power pulling and downhill braking, and during stationary braking.

14. The electromagnetic system of claim 13 wherein said wheel loading means comprises an electromagnet.

15. A method of detecting a broken rail of a railroad track comprising the steps of:

forming a complete electromagnetic circuit joining one rail of the track at two locations on the one rail with a second rail of the track at two locations on the second rail, respectively;

moving the electromagnetic circuit along the track so as to encompass the two locations on each of said first and second rails within an area moving along the track; and

detecting a change in magnetic flux in said circuit as an indication that said area encompasses at least one crack in at least one of the rails.

16. The method of claim 15 including means for geographically locating a position along the track where said at least one crack has been found.

17. The method of detecting a broken rail of claim 15 wherein said electromagnetic circuit encompasses a respective wheel contacting the track at each of the two locations on the one rail, respectively, and at each of the two locations on the second rail, respectively.

18. A method for detecting, from a moving rail vehicle, a break in either rail of a pair of rails on which said vehicle is moving, said vehicle including at least a first pair of wheels supported on a first axle and a seoncd pair of wheels supported on a second axle, said method comprising the steps of:

forming a complete magnetic circuit comprising said first and second pair of wheels, said first and second axles, and a portion of each of said rails situated between the wheels of said first pair and the wheels of said second pair, respectively;

generating constant magnetic flux within said magnetic circuit; and

monitoring the magnetic flux within said magnetic circuit to detect variation in the level of said flux as an indication of a broken rail situated between the wheels of said first pair and the wheels of said second pair, respectively.

19. The method of claim 18 including the step of ascertaining a geographic location for each detected break in a rail.

20. A method of increasing friction between a railcar and a railroad track, said railcar including a source of electrical power, comprising the steps of:

detecting wheel slippage during power pulling and downhill braking; and

employing said electrical power to generate an electromagnetic field between said railcar and said railroad track while said wheel slippage is detected and during stationary braking, such that said electromagnetic field acts to pull said railcar downward toward said track.