Railroad crossing traffic warning system apparatus and method therefore

• US 5,735,492 A
• Filed: 09/16/1996
• Issued: 04/07/1998
• Est. Priority Date: 02/04/1991
• Status: Expired due to Fees

• Current Assignee: EVA Signal Corporation
• Original Assignee: EVA Signal Corporation
• Inventors: Pace, Joseph A.
• Primary Examiner(s): MORANO IV, SAMUEL J
• Application Number:
  US08/710,147
• Time in Patent Office: 568 Days
• Field of Search: 246/125, 246/126, 246/127, 246/293, 246/294, 246/297, 246/473.1, 246/473.3, 246/202, 246/167 A, 246/270 R, 246/292, 246/473, 246/477, 340/904, 340/908, 340/933, 340/941
• US Class Current: 246/125
• CPC Class Codes: B61L 2207/02 using light-emitting diodes [LEDs]
• CPC Class Codes: B61L 29/282 magnetic or inductive control by the vehicle
• CPC Class Codes: B61L 9/04 electric

Abstract

A railroad crossing traffic warning system for alerting a motorist approaching a railroad crossing to the presence of an oncoming train. The system comprises a series of magnetometer sensor probes buried in the right-of way adjacent to a railroad track at predetermined distances from the railroad crossing. These sensors provide a signal to a controller unit when the presence of a train is sensed. The controller unit first determines the speed at which the oncoming train is traveling and the time it will take for the train to reach the crossing and then activates an improved warning apparatus at a predetermined amount of time before the train reaches the crossing. The improved warning apparatus comprises an X-shaped railroad crossing warning sign or "crossbuck" having a plurality of light emitting diodes ("LED") or the like mounted on the across the center thereof, a plurality of strobe lights, and a train direction indicator comprising a plurality of lamps which are lighted sequentially to indicate the direction in which the oncoming train is traveling. The system may be powered by a rechargeable battery which may be recharged by a solar panel array allowing the system to be utilized at crossings located in rural areas where a source of AC electrical power is not readily available

Claims

1. A railroad crossing traffic warning system for alerting a motorist approaching a railroad crossing over a railroad track to the presence of an oncoming railroad train, said warning system comprising:

(a) a train detection sensor for detecting an oncoming train and for producing a train detection signal in response to the presence of an oncoming train, said train detection sensor being positioned adjacent to the railroad track at a predetermined distance from the railroad crossing;

(b) a controller unit for receiving the train detection signal from said train detection sensor, said controller unit comprising;

(i) microprocessor means for processing the train detection signal of said detection sensor,

(ii) sensor signal interface means for interfacing the train detection signal of said detection sensor with said microprocessor means,

(iii) means for controlling said means for alerting the motorist, said controlling means being operationally connected to said microprocessor means and to said alerting means,

(iv) battery means for supplying operational power to said microprocessor means; and

(c) means for alerting the motorist to the presence of an oncoming railroad train such that the motorist may take cautionary or evasive action before the arrival of an oncoming train at the railroad crossing, said alerting means being coupled to and controlled by said controller unit.

2. The railroad crossing traffic warning system of claim 1 wherein said detection sensor is a magnetometer.

3. The railroad crossing traffic warning system of claim 1 wherein said means for alerting the motorist to the presence of an oncoming railroad train comprises:

(a) support means, said support means placed at an entrance to the railroad crossing; and

(b) visual warning means mounted on said support means for providing a visual output signal, said visual warning means being responsive to said controlling means.

4. The railroad crossing traffic warning system of claim 3 wherein said visual warning means comprises an X-shaped railroad crossing warning sign, said warning sign having a reflector means for reflecting the lights of an oncoming automobile and a plurality of lighting means, said plurality of lighting means forming an X-shape.

5. The railroad crossing traffic warning system of claim 4 wherein said lighting means is a light emitting diode.

6. The railroad crossing traffic warning system of claim 3 wherein said visual warning means comprises a strobe light.

7. The railroad crossing traffic warning system of claim 3 wherein said visual warning means comprises a train direction indicator means, said train direction indicator means including a plurality of lamps placed adjacent to each other in a line, said plurality of lamps lighted sequentially to indicate the direction in which an oncoming train is traveling.

8. The railroad crossing traffic warning system of claim 1 wherein said means for alerting the motorist to the presence of an oncoming railroad train comprises audible warning means mounted on said supporting means for providing an audible output signal, said audible warning means being responsive to said controller means.

9. The railroad crossing traffic warning system of claim 8 wherein said audible warning means includes a siren horn.

10. The railroad crossing traffic warning system of claim 8 wherein said audible warning means includes a bell.

11. A railroad crossing traffic warning system for alerting a motorist at a railroad crossing over a railroad track to the presence of an oncoming train, said warning system comprising:

(a) a first train detection magnetometer for detecting an oncoming train and for producing a first train detection signal in response to the presence of an oncoming train, said first train detection magnetometer being positioned adjacent to the railroad track at a first predetermined distance from the railroad crossing;

(b) a second train detection magnetometer for detecting an oncoming train and for producing a second train detection signal in response to the presence of an oncoming train, said second train detection magnetometer being positioned adjacent to the railroad track at a second predetermined distance from the railroad crossing;

(b) a controller unit for receiving said first train detection signal from said first train detection magnetometer and said second train detection signal from said second train detection magnetometer, said controller unit comprising;

(i) microprocessor means for processing the first train detection signal of said first train detection magnetometer and the second train detection signal of said second train detection magnetometer, said microprocessor means comparing said first and second train detection signals to determine a speed and which an oncoming train is traveling;

(ii) magnetometer signal interface means for interfacing the first train detection signal of said first train detection magnetometer and the second train detection signal of said second train detection magnetometer with said microprocessor means;

(ii) means for controlling said means for alerting the motorist, said controlling means being operationally connected to said microprocessor means and to said alerting means;

(iii) battery means for supplying operational power to said microprocessor means; and

(c) means for alerting the motorist to the presence of an oncoming railroad train such that the motorist may take cautionary or evasive action before the arrival of an oncoming train at the railroad crossing, said alerting means being coupled to and controlled by said controller unit.

12. The railroad crossing traffic warning system of claim 11 wherein said means for alerting the motorist to the presence of an oncoming train comprises:

(a) support means, said support means placed at an entrance to the railroad crossing; and

(b) visual warning means mounted on said support means for providing a visual output signal, said visual warning means being responsive to said controller means.

13. The railroad crossing traffic warning system of claim 12 wherein said visual warning means comprises an X-shaped railroad crossing warning sign, said warning sign having a reflector means for reflecting the lights of an oncoming automobile and a plurality of lighting means, said plurality of lighting means forming an X-shape.

14. The railroad crossing traffic warning system of claim 13 wherein said lighting means is a light emitting diode.

15. The railroad crossing traffic warning system of claim 12 wherein said visual warning means comprises at least one strobe light.

16. The railroad crossing traffic warning system of claim 12 wherein said visual warning means comprises a train direction indicator means, said train direction indicator means including a plurality of lamps placed adjacent to each other in a line;

said plurality of lamps lighted sequentially to indicate the direction in which an oncoming train is traveling.

17. The railroad crossing traffic warning system of claim 11 further comprising a backup train detection sensor for detecting an oncoming train and for producing a backup train detection signal in response to the presence of an oncoming train, said backup train detection sensor being positioned adjacent to the railroad track at a third predetermined distance from the railroad crossing, said backup train detection signal provided to said controller unit.

18. The railroad crossing traffic warning system of claim 17 wherein said backup train detection sensor is a magnetometer.

19. The railroad crossing traffic warning system of claim 11 wherein said means for alerting the motorist to the presence of an oncoming railroad train comprises audible warning means mounted on said supporting means for providing an audible output signal, said audible warning means being responsive to said controller means.

20. The railroad crossing traffic warning system of claim 19 wherein said audible warning means includes a siren horn.

21. The railroad crossing traffic warning system of claim 19 wherein said audible warning means includes a bell.

22. A method for warming a motorist at a railroad crossing of the presence of an oncoming railroad train, said warning method comprising:

(a) detecting the presence of an oncoming train at first and second predetermined distances from the railroad crossing;

(b) determining the time required for an oncoming train to reach the railroad crossing;

(c) detecting the presence of an oncoming train at a third predetermined distance from the railroad crossing; and

(d) activating means for alerting the motorist to the presence of an oncoming train when the presence of an oncoming train is detected at said third predetermined distance from the railroad crossing.

23. The warning method according to claim 22 wherein said detecting steps include detecting the presence of an approaching train with a magnetometer sensor whereby the magnetometer sensor detects variance in the magnetic field of the earth caused by the presence of a train.

24. The warning method according to claim 22 further comprising the steps of detecting when the train has passed the railroad crossing and thereafter automatically deactivating the motorist alerting means.

25. The warning method according to claim 24 wherein said detecting steps include detecting the presence of an approaching train with a magnetometer sensor whereby the magnetometer sensor detects variance in the magnetic field of the earth caused by the presence of a train.

26. An apparatus for warning a motorist at a railroad crossing of the presence of an oncoming train comprising:

(a) a support means;

(b) an X-shaped railroad crossing warning sign mounted on said support means, said warning sign having a reflector means for reflecting the lights of an oncoming automobile and a plurality of lighting means, said plurality of lighting means forming an X-shape;

(c) a strobe light;

(d) a train direction indicator means, said train direction indicator means including a plurality of lamps placed adjacent to each other in a line;

said plurality of lamps lighted sequentially to indicate the direction in which an oncoming train is traveling; and

(e) an audible warning means mounted on said supporting means for providing an audible output signal.

27. The of apparatus of claim 26 wherein said audible warning means includes a siren horn.

28. The apparatus of claim 26 wherein said audible warning means includes a bell.

29. The apparatus of claim 26 further comprising a shroud mounted behind said X-shaped railroad crossing warning sign.

30. The apparatus of claim 26 wherein said lighting means comprises a light emitting diode.

31. A railroad crossing traffic warning system having apparatus for detecting the presence of a train in a railroad crossing and activating a means for alerting a motorist, said apparatus comprising:

(a) a transmitter for transmitting an infrared light beam diagonally across the railroad crossing;

(b) a receiver for receiving said infrared light beam, said receiver producing a train not present signal in response to receiving said infrared light beam;

(c) a controller means, said controller means for receiving the train not present signal from said receiver.

32. A railroad crossing traffic warning system for alerting a motorist at a railroad crossing over a railroad track to the presence of an oncoming train, said warning system comprising:

(a) a first train detection sensor for detecting an oncoming train and for producing a first train detection signal in response to the presence of an oncoming train, said first train detection sensor being positioned adjacent to the railroad track at a first predetermined distance from the railroad crossing;

(b) a second train detection sensor for detecting an oncoming train and for producing a second train detection signal in response to the presence of an oncoming train, said second train detection sensor being positioned adjacent to the railroad track at a second predetermined distance from the railroad crossing;

(b) a controller unit for receiving said first train detection signal from said first train detection sensor and said second train detection signal from said second train detection sensor; and

(c) a backup train detection sensor for detecting an oncoming train and for producing a backup train detection signal in response to the presence of an oncoming train, said backup train detection sensor being positioned adjacent to the railroad track at a third predetermined distance from the railroad crossing, said backup train detection signal provided to said controller unit.

33. The railroad crossing traffic warming system of claim 32 wherein said backup train detection sensor is a magnetometer.

34. The railroad crossing traffic warning system of claim 32 wherein said controller unit comprises:

(a) microprocessor means for processing the first train detection signal of said first train detection sensor, the second train detection signal of said second train detection sensor, and the backup train detection signal of said backup train detection sensor;

(b) sensor signal interface means for interfacing the first train detection signal of said first train detection sensor, the second train detection signal of said second train detection sensor, and the backup train detection signal of said backup train detection sensor with said microprocessor means;

(c) means for controlling said means for alerting the motorist, said controlling means being operationally connected to said microprocessor means and to said alerting means;

(d) battery means for supplying operational power to said microprocessor means.