Filtering method for improving the data quality of geometric tire measurements
First Claim
1. A method of processing geometric measurements of a tire, comprisingmeasuring the surface of a tire to obtain an electronic data set of geometric measurements including a plurality of parameter values at respective angular positions relative to the given tire;
- electronically identifying selected ones of the parameter values that lie on a convex hull surrounding the entire set of values; and
electronically interpolating the identified selected ones of the parameter values that lie on the convex hull to obtain a final data set of filtered geometric measurementswherein said steps of electronically identifying and electronically interpolating are performed once for the data set of geometric measurements initially obtained in said measuring step and separately for the inverted data set of geometric measurements, resulting in perspective first and second final data sets of filtered geometric measurements.
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Abstract
A tire measurement system includes a computer with various memory/media elements for storing raw and transformed tire measurement data (e.g., a data set of measured radial or lateral run-out values) as well as software in the form of computer-executable instructions, which are executed by a processor to filter selected run-out values within the obtained data set that spike above adjacent measurements, identify selected ones of the filtered run-out values that lie on a convex hull surrounding the entire set of values, and perform interpolation of the identified selected ones of the run-out values that lie on the convex hull to obtain a final data set of filtered run-out measurements. Similar steps can be performed on an inverted data set to better detect sidewall deformation features such as sidewall depressions.
35 Citations
18 Claims
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1. A method of processing geometric measurements of a tire, comprising
measuring the surface of a tire to obtain an electronic data set of geometric measurements including a plurality of parameter values at respective angular positions relative to the given tire; -
electronically identifying selected ones of the parameter values that lie on a convex hull surrounding the entire set of values; and electronically interpolating the identified selected ones of the parameter values that lie on the convex hull to obtain a final data set of filtered geometric measurements wherein said steps of electronically identifying and electronically interpolating are performed once for the data set of geometric measurements initially obtained in said measuring step and separately for the inverted data set of geometric measurements, resulting in perspective first and second final data sets of filtered geometric measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A tire measurement system for processing measurement characteristics associated with a given tire rotated at one or more predetermined speeds, said tire measurement system more particularly comprising:
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a first memory adapted for storing measurements, each measurement corresponding to a geometric parameter value obtained at an angular position relative to the given tire; a second memory adapted for storing software in the form of computer-executable instructions; and at least one processor coupled to said first and second memories and configured to selectively implement the computer-executable instructions stored in the second memory to process the measurements stored in the first memory; wherein said at least one processor implements the computer-executable instructions stored in said second memory in order to implement the functions of;
identifying selected ones of the geometric parameter values that lie on a convex hull surrounding the entire set of values, and interpolating the identified selected ones of the geometric parameter values that lie on the convex hull to obtain a final data set of filtered measurementswherein said it least one processor is further configured to transform the plurality of geometric parameter values into two-dimensional form by characterizing the geometric parameter values in terms of a curvature location along the surface of the given tire measured in first and second orthogonal directions. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification