Broken wheel detection system

Patent metadata

Field	Value
Publication number	US-11142230-B2
Application number	US-202016940505-A
Country	US
Kind code	B2
Filing date	Jul 28, 2020
Priority date	Feb 22, 2017
Publication date	Oct 12, 2021
Grant date	Oct 12, 2021

Abstract

A broken wheel detection system for detecting broken wheels on rail vehicles even when such vehicles are moving at a high rate of speed by determining the positions, lengths, or orientations of structured light lines projected against passing wheels.

First claim

What is claimed is:

1. A broken wheel detection apparatus for detecting broken wheels on rail cars while a rail car is in motion passing by the broken wheel detection apparatus, the broken wheel detection apparatus comprising:
a first rail sensor assembly located alongside a railroad track comprising a first structured light generator directed toward a first section of a first rail, and a first digital area scan camera directed to a first wheel assessment zone which includes the first section of the first rail;
a second rail sensor assembly located alongside a railroad track comprising a second structured light generator directed toward a first section of a second rail, and a second digital area scan camera directed to a second wheel assessment zone which includes the first section of the second rail; and
a processor in communication with the first rail sensor assembly and the second rail sensor assembly wherein the processor controls operations of the first structured light generator, the second structured light generator, the first digital area scan camera, and the second digital area scan camera, and wherein the processor performs a method for detecting and recording a defect of a wheel on a rail car as such rail car passes by the broken wheel detection apparatus, the method comprising operations of:
a. obtaining a first plurality of elevation scan frames of a first wheel of a passing rail car using the first digital area scan camera wherein the first wheel is traveling on the first rail;
b. identifying parallel structured light lines in the first plurality of elevation scan frames;
c. recording positions, lengths, or orientations of at least some of the parallel structured light lines in each frame of the first plurality of elevation scan frames;
d. comparing the positions, lengths, or orientations of the recorded parallel structured light lines in each elevation scan frame of the first plurality of elevation scan frames to determine whether all recorded corresponding structured light lines maintain the positions, lengths, or orientations for each elevation scan frame of the first plurality of elevation scan frames;
e. obtaining a second plurality of elevation scan frames of a second wheel of a passing rail car using the second digital area scan camera wherein the second wheel is traveling on the second rail;
f. identifying parallel structured light lines in the second plurality of elevation scan frames;
g. recording positions, lengths, or orientations of at least some of the parallel structured light lines in each frame of the second plurality of elevation scan frames; and
h. comparing the positions, lengths, or orientations of the recorded parallel structured light lines in each elevation scan frame of the second plurality of elevation scan frames to determine whether all recorded corresponding structured light lines maintain the positions, lengths, or orientations for each elevation scan frame of the second plurality of elevation scan frames.

2. The broken wheel detection apparatus of claim 1 further comprising a wheel detector in communication with the processor.

3. The broken wheel detection apparatus of claim 1 further comprising an Automatic Equipment Identification (AEI) device in communication with the processor.

4. The broken wheel detection apparatus of claim 1 wherein the method for detecting and recording a defect of a wheel on a rail car as such rail car passes by the broken wheel detection apparatus further comprises an operation of:
e. recording a defect indication that the first wheel or the second wheel of the rail car includes no defects if the positions, lengths, or orientations of each of the recorded structured light lines in the first plurality of elevation scan frames or the second plurality of elevation scan frames is determined by the processor to be not different for each elevation scan frame; or recording a defect indication that the first wheel or the second wheel of the rail car includes a defect if a position, lengths, or orientation of any of the recorded structured light lines in the first plurality of elevation scan frames or the second plurality of elevation scan frames is determined by the processor to be different in any of the elevation scan frames from the positions, lengths or orientations recorded in operation c. or g.

5. The broken wheel detection apparatus of claim 3 wherein the method for detecting and recording a defect of a wheel on a rail car as such rail car passes by the broken wheel detection apparatus further comprises operations of:
i. obtaining an identity of a specific rail car on which the first wheel and the second wheel of the rail car are mounted using information from the AEI device;
j. obtaining a specific wheel count calculated by the processor; and
k. recording the identity of the specific rail car on which the first wheel and the second wheel of the rail car are mounted, the specific wheel count, and a defect indication on the processor to associate such data with the first wheel or the second wheel of the rail car.

6. A method for detecting broken wheels on rail cars while a rail car is in motion, which comprises operations of,
a. projecting structured light lines toward a rail car as it passes by a broken wheel detection apparatus located alongside a railroad track using a first light generator and a second light generator in communication with a processor;
b. obtaining a first plurality of elevation scan frames of a first wheel of the rail car using a first digital area scan camera in communication with the processor wherein the first wheel is traveling along a first rail;
c. identifying parallel structured light lines in the first plurality of elevation scan frames using the processor;
d. recording positions, lengths or orientations of at least some of the parallel structured light lines in the first plurality of elevation scan frames;
e. obtaining a second plurality of elevation scan frames of a second wheel of the rail car using a second digital area scan camera in communication with the processor wherein the second wheel is traveling along a second rail;
f. identifying parallel structured light lines in the second plurality of elevation scan frames using the processor;
g. recording positions, lengths or orientations of at least some of the parallel structured light lines in the second plurality of elevation scan frames; and
h. comparing the positions, lengths or orientations of the recorded parallel structured light lines in each elevation scan frame of the first plurality of elevation scan frames and the second plurality of elevation scan frames using the processor to determine whether all recorded corresponding structured light lines maintain the positions, lengths, or orientations for each elevation scan frame of the first plurality of elevation scan frames and the second plurality of elevation scan frames.

7. The method of claim 6 further comprising an operation of,
i. recording a defect indication that the first wheel or the second wheel of the rail car includes no defects if the positions, lengths, or orientations of each of the recorded structured light lines in the first plurality of elevation scan frames and the second plurality of elevation scan frames is determined by the processor to be not different for each elevation scan frame; or recording a defect indication that the first wheel or the second wheel of the rail car includes a defect if a position, length, or orientation of any of the recorded structured light lines in the first plurality of elevation scan frames or the second plurality of elevation scan frames is determined by the processor to be different in any of the elevation scan frames from the positions, lengths or orientations recorded in operations d. and g.

Assignees

• Tetra Tech

Inventors

• Mesher Darel

Classifications

• H04N23/56

  provided with illuminating means · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• B61L27/40

  Handling position reports or trackside vehicle data · CPC title

• B61L27/57

  for vehicles or trains, e.g. trackside supervision of train conditions · CPC title