Method for detection and estimation of tire tread wear

• US 10,311,835 B1
• Filed: 09/14/2017
• Issued: 06/04/2019
• Est. Priority Date: 06/01/2012
• Status: Active Grant

• Current Assignee: Hunter Engineering Company
• Original Assignee: Hunter Engineering Company
• Inventors: Dorrance, Daniel R., Colarelli, III, Nicholas J., Strege, Timothy A.
• Primary Examiner(s): Slater, Alison
• Application Number:
  US15/704,714
• Time in Patent Office: 628 Days
• CPC Class Codes: B60C 99/006 Computer aided tyre design or simulation
• CPC Class Codes: G01B 11/22 for measuring depth
• CPC Class Codes: G06V 10/44 Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
• CPC Class Codes: G06V 20/647 by matching two-dimensional images to three-dimensional objects
• CPC Class Codes: G09G 2340/12 Overlay of images, i.e. displayed pixel being the result of switching between the corresponding input pixels
• CPC Class Codes: G09G 2380/10 Automotive applications
• CPC Class Codes: G09G 5/14 Display of multiple viewports
• CPC Class Codes: G09G 5/40 characterised by the way in which both a pattern determined by character code and another pattern are displayed simultaneously, or either pattern is displayed selectively, e.g. with character code memory and APA, i.e. all-points-addressable, memory
• CPC Class Codes: H04N 13/204 using stereoscopic image cameras stereoscopic photography G03B35/00

Abstract

A vehicle service system configured to acquire images of a three-dimensional region of a vehicle wheel assembly tire tread surface. The vehicle service system is configured to process the acquired images to produce a collection of data points corresponding to the spatial position of surface points in the region from which tire tread wear characteristics are identified. The acquired images are further utilized to provide both a graphical and a numerical display to an operator, with the numerical display linked to specifically annotated or indexed points or windows within the graphical display, thereby enabling an operator to quickly identify specific focus points or regions on the tire surface which have been measured at the numerically identified tread depths.

Claims

1. A method for identifying tire damage within a visual display of tread depth information associated with a tire of a vehicle wheel assembly, comprising:

acquiring tread depth measurement data from a plurality of points within a three-dimensional tire surface region including both a tire center region and at least one tire shoulder region adjacent to said tire center region;

processing said acquired tread depth measurement data to generate a tire surface image which is representative of tire tread depth at said plurality of points within said three-dimensional tire surface region;

evaluating at least a portion of said acquired tire tread depth measurement data to identify a predominant tread wear pattern within said three-dimensional tire surface region;

identifying tread depth measurements within said acquired tread depth measurement data which deviate from said predominant tread wear pattern; and

responsive to said identification, presenting within said generated tire surface image, at least one visual indication associated with said identified tread depth measurements which deviate from said predominant tread wear pattern; and

presenting at least one annotation warning of possible tire damage associated with said at least one visual indication.

2. The method of claim 1 wherein said step of identifying tread depth measurements within said acquired tread depth measurement data which deviate from said predominant tread wear pattern identifies tread depth measurements having a depth which is below a tire tread lower surface, indicative of tire damage penetrating an underlying tire carcass, including at least one occurrence of absent tread, tread chunking, tread separation, or an exposed belt.

3. A method for identifying tire damage within a visual display of tread depth information associated with a tire of a vehicle wheel assembly, comprising:

acquiring tread depth measurement data from a plurality of points within a three-dimensional tire surface region including both a tire center region and at least one tire shoulder region adjacent to said tire center region;

processing said acquired tread depth measurement data to generate a tire surface image which is representative of tire tread depth at said plurality of points within said three-dimensional tire surface region;

evaluating at least a portion of said acquired tire tread depth measurement data to identify observed tread wear within said three-dimensional tire surface region;

comparing said observed tread wear with expected tread wear to identify tread depth measurements within said acquired tread depth measurement data which deviate from said expected tread wear; and

responsive to said identification, presenting within said generated tire surface image, at least one visual indication associated with said identified tread depth measurements which deviate from said expected tread wear; and

presenting at least one annotation warning of possible tire damage associated with said at least one visual indication.

4. The method of claim 3 wherein said step of comparing identifies tread depth measurements having a depth which is below a tire tread lower surface, indicative of tire damage penetrating an underlying tire carcass, including at least one occurrence of absent tread, tread chunking, tread separation, or an exposed belt.

5. The method of claim 3 wherein said step of comparing identifies excessive wear within said at least one tire shoulder region when said observed tread wear is greater than said expected tread wear within said at least one tire shoulder region.

6. A method for presenting a visual display of tire tread depth information associated with a vehicle wheel assembly, comprising:

acquiring tire tread depth measurement data from a plurality of points within a three-dimensional tire surface region including both a tire center region and at least one tire shoulder region adjacent to said tire center region;

evaluating at least a portion of said acquired tire tread depth measurement data to identify a predominant tread wear pattern within said three-dimensional tire surface region;

identifying tread depth measurements within said acquired tread depth measurement data which deviate from said predominant tread wear pattern;

generating a two-dimensional tire surface region image from said acquired tire tread depth measurement data, said image representative of tire tread depths at said plurality of points within said tire surface region for display to an operator;

responsive to an identification of at least one tread depth measurement which deviates from said predominant tire tread wear pattern,

providing at least one distinct color within said two-dimensional tire surface region image to illustrate each of said identified points; and

presenting at least one visual indication within said two-dimensional tire surface region image indicating possible tire damage associated with said identified points;

displaying at least one annotation associated with said at least one visual indication.