Wheel alignment with surface-oriented runout determination
First Claim
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1. A method for calculating a wheel alignment angle using measurement sensors mounted on a wheel, the method comprising:
- disposing the wheel on a surface such that the wheel is rotatable while maintaining contact with the surface;
measuring at least one uncompensated alignment angle for the wheel;
measuring at least one wheel parameter at a plurality of positions of the wheel while disposed on the surface;
determining wheel runout for the wheel using the at least one wheel parameter;
calculating a predetermined threshold runout error;
determining a need for runout compensation, based on the amount of runout in comparison with the predetermined threshold;
calculating at least one compensated alignment angle for the wheel as a function of the wheel runout and the uncompensated alignment angle if the runout is above the predetermined threshold runout error; and
performing a wheel alignment procedure using the compensated alignment angle.
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Abstract
Methods and systems for measuring and calculating wheel alignment angles are disclosed. The measuring methods include mitigating alignment error by compensating for wheel runout, and further include measuring wheel runout while the wheel maintains contact with an alignment surface.
15 Citations
13 Claims
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1. A method for calculating a wheel alignment angle using measurement sensors mounted on a wheel, the method comprising:
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disposing the wheel on a surface such that the wheel is rotatable while maintaining contact with the surface; measuring at least one uncompensated alignment angle for the wheel; measuring at least one wheel parameter at a plurality of positions of the wheel while disposed on the surface; determining wheel runout for the wheel using the at least one wheel parameter; calculating a predetermined threshold runout error; determining a need for runout compensation, based on the amount of runout in comparison with the predetermined threshold; calculating at least one compensated alignment angle for the wheel as a function of the wheel runout and the uncompensated alignment angle if the runout is above the predetermined threshold runout error; and performing a wheel alignment procedure using the compensated alignment angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring runout of a wheel, the method composing:
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disposing the wheel on a surface such that the wheel is rotatable while maintaining contact with the surface; rotating the wheel to a first position; measuring camber and toe at the first position to generate a first data point; rotating the wheel to a second position; measuring camber and toe at the second position to generate a second data point; rotating the wheel to a third position; measuring camber and toe at the third position to generate a third data point; determining a circle whose circumference substantially coincides with a combination of the first, second and third data points; measuring the radius of the circle; calculating a predetermined threshold radius; determining a need for runout compensation based on the radius in comparison with the predetermined threshold radius; and
performing a wheel alignment procedure using the determined need for runout compensation.
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12. A method for calculating a wheel alignment angle using measurement sensors mounted on a wheel, the method comprising:
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disposing the wheel on a surface such that the wheel is rotatable while maintaining contact with the surface; measuring at least one uncompensated alignment angle for the wheel; measuring at least one wheel parameter at a plurality of positions of the wheel while disposed on the surface; determining wheel runout for the wheel using the at least one wheel parameter; calculating a predetermined threshold runout error; determining the need for runout compensation, depending upon whether the runout is above or below the predetermined threshold runout error; and performing a wheel alignment procedure using the determined need for runout compensation.
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13. A system for measuring runout of a wheel, the system comprising:
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means for disposing the wheel on a surface such that the wheel is rotatable while maintaining contact with the surface; means for measuring camber and toe at a first position to generate a first data point; means for measuring camber and toe at a second position to generate a second data point; means for measuring camber and toe at a third position to generate a third data point; means for determining a circle whose circumference substantially coincides with a combination of the first, second and third data points; means for measuring the radius of the circle; means for calculating a predetermined threshold radius; means for determining a need for runout compensation based on the radius in comparison with the predetermined threshold radius; and means for performing a wheel alignment procedure using the determined need for runout compensation.
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Specification