Method of detecting obstacles on railroad lines

• US 6,565,046 B2
• Filed: 11/30/2000
• Issued: 05/20/2003
• Est. Priority Date: 12/04/1999
• Status: Expired due to Fees

• Current Assignee: Alcatel SA (Nokia Corporation)
• Original Assignee: Alcatel SA (Nokia Corporation)
• Inventors: Uebel, Helmut
• Primary Examiner(s): Le, Mark T.
• Application Number:
  US09/726,039
• Publication Number:
  US 20010002688A1
• Time in Patent Office: 901 Days
• Field of Search: 246/1.C, 246/3, 246/167.R, 246/111, 246/473.R, 246/113, 246/114.R, 246/115, 246/120, 246/121, 246/166, 246/473.1, 246/477, 348/143, 348/145, 701/19, 701/301
• US Class Current: 246/120
• CPC Class Codes: B61L 23/041 Obstacle detection
• CPC Class Codes: B61L 27/04 Automatic systems, e.g. controlled by train; Change-over to manual control

Abstract

A method and system of detecting obstacles on railroad lines. Sensors for observing the railroad line are arranged along the railroad line, and automatic evaluation takes place. One advantage of the invention is that the railroad lines are divided into given, known line sections, each of which is monitored by a respective sensor, whereby the evaluation process is simplified. If the sensors are designed as video cameras, for example, a comparison with still images may suffice for the evaluation. Furthermore, as the line sections re known, a simple masking technique can be used. Obstacles outside a set route to be monitored are masked out using suitable masks.

Claims

1. A method of detecting obstacles on railroad lines for automatically controlled, driverless rail vehicles, said method comprising the steps of:

arranging sensors along the railroad lines, such that the sensors provide overlapping fields of view along a majority of a railroad line between two stations, which sensors operate in an optical range, an infrared range, or a radio-wave range;

observing routes ahead of the automatically controlled, driverless rail vehicles traveling on the railroad lines; and

automatically evaluating the sensor output signals, the automatic evaluation controlling, at least in part, the automatically controlled, driverless rail vehicles.

4. A method as claimed in claim 1, characterized in that the sensors are remotely controllable.

5. A method as claimed in claim 1, characterized in that each sensor output signal contains a time stamp.

6. A method as claimed in claim 1, characterized in that at least part of results of the evaluation are automatically transferred by radio or via beacons to at least one automatically controlled, driverless rail vehicle.

7. A method as claimed in claim 1, characterized in that at least part of results of the evaluation are automatically transferred to at least one track release facility, and that depending on the results received, each track release facility clears or closes particular railroad line sections.

8. A method as claimed in claim 1, characterized in that the sensors are designed as video cameras which take still images that are transmitted to a center, and that at the center the received still images are evaluated by a comparison with reference images.

12. A system, for carrying out the method of claim 1, characterized in that automatically controlled, driverless rail vehicles and sensors are provided, such that the sensors are arranged along the railroad line and operate in an optical range, an infrared range, or a radio-wave range, to observe routes ahead of automatically controlled, driverless rail vehicles traveling on the railroad lines, and that the sensors are adapted to communicate with the automatically controlled, driverless rail vehicles traveling on the railroad lines by radio or via beacons.

2. A method of detecting obstacles on railroad lines for automatically controlled, driverless rail vehicles, said method comprising:

arranging along the railroad lines sensors which operate in an optical range, an infrared range, or a radio-wave range;

observing routes ahead of the automatically controlled, driverless rail vehicles traveling on the railroad lines; and

automatically evaluating the sensor output signals, the automatic evaluation controlling, at least in part, the automatically controlled, driverless rail vehicles, characterized in that the sensors are designed as video cameras which take still images, that a processor and a memory are provided in each of the sensors, and that each of the sensors is adapted to compare a current still image with a stored reference image and to perform the obstacle detection for a line section autonomously.

3. A method according to claim 2, characterized in that when no obstacle is detected, the sensor output signals contain a status message, and that when an obstacle is detected, the sensor output signals contain the corresponding current still image.

9. A railroad line abnormal condition detection system, comprising:

sensors arranged at posts along railroad lines, said sensors operating in an optical range, an infrared range, or a radio-wave range, the sensors providing overlapping fields of view and observing a majority of a route of rail vehicles traveling on the railroad lines; and

a center coupled to said sensors by optical or electric lines, radio links, or power lines, the center being adapted to perform an evaluation of output signals of all the sensors centrally, the evaluated sensor output signals controlling, at least in part, the rail vehicles.

10. A system as claimed in claim 9 characterized in that the center is adapted to communicate with automatically controlled, driverless rail vehicles traveling on the railroad lines by radio or via beacons, and to clear or close particular line sections depending on the results of the evaluation.

11. A system as claimed in claim 9, characterized in that the sensors include video cameras which take still images that are transmitted to the center using multiplexing, with each sensor being assigned an address, and each transmission of a still image including the address of the associated sensor.

13. A method of detecting an abnormal condition on a railroad line comprising:

picking up route data in sensors arranged along said railroad lines such that the sensors provide fields of view along a substantial portion of a railroad line, said sensors operating in an optical range, an infrared range or a radio-wave range;

evaluating said route data based on a route masking technique to detect an obstacle or said abnormal condition; and

transmitting a signal according to a result of the evaluation to a rail vehicle or a center, wherein said sensors provide fields of view of a majority of route.

14. A system of detecting an abnormal condition on a railroad line comprising:

means for picking up route data in sensors arranged at posts along the railroad line such that the sensors provide overlapping fields of view along a majority of a railroad line between two stations, said sensors operating in an optical range, an infrared range or a radio-wave range;

means for evaluating said route data based on a route masking technique to detect an obstacle or said abnormal condition; and

means for transmitting a signal according to a result of the evaluation to a rail vehicle or a center.