Method for ascertaining the axis of rotation of a vehicle wheel
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Accused Products
Abstract
A method for ascertaining the axis of rotation of a vehicle wheel in which a light pattern is projected at least onto the wheel during the rotation of the wheel and the light pattern reflected from the wheel is detected by a calibrated imaging sensor system and analyzed in an analyzer device. Accurate and robust measurement of the axis of rotation and, optionally, of the axis and wheel geometry, in particular when the vehicle is passing by, is achieved in that a 3D point cloud with respect to the wheel is determined in the analysis and a parametric surface model of the wheel is adapted thereto; normal vectors of the wheel are calculated for different rotational positions of the wheel for obtaining the axes of rotation; and the axis of rotation vector is calculated as the axis of rotation from the spatial movement of the normal vector of the wheel.
95 Citations
23 Claims
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1-11. -11. (canceled)
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12. A method for ascertaining an axis of rotation of a vehicle wheel, comprising:
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projecting a light pattern at least onto the wheel during rotation of the wheel; detecting a light pattern reflected from the wheel by a calibrated imaging sensor system; and analyzing the light pattern in an analyzer device, the analyzing including determining a 3D point cloud with respect to the wheel, fitting a parametric surface model of the wheel to the point cloud, calculating normal vectors of the wheel for different rotation positions of the wheel to obtain wheel axes, an axis of rotation vector being calculated as the axis of rotation from a spatial movement of the normal vector of the wheel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification