Projector excursion compensation in wheel alignment systems

Details Projector excursion compensation in wheel alignment systems Projector excursion compensation in wheel alignment systems

G - Physics

01

B

33/55

G01B 11/26 (2006.01) G01B 11/275 (2006.01)

Patent

CA 1130090

Abstract of the Disclosure An improved method and apparatus for aligning the front wheels of a motor vehicle utilizing a beam pro- jector and detector assembly on each wheel and an electronic computing means for determining the toe angles of the wheels in response to measured toe signals gener- ated by the detectors. The computing means first sub- tracts one of the toe signals from the other, multiplies the difference by a selected correction factor to produce a correction signal, and then adds the correction signal to the larger of the measured toe signals and subtracts the correction signal from the smaller one to provide the true individual toe angles of the wheels. The signal, derived by the computing means are applied to display devices which read out the correct values of the right and left toe angles. Although the correction factor is dependent on the dimensions of the frame of the vehicle, the steering suspension, and the mounting of the projector and detector assembly, it has been found that a correction factor of approximately 0.28 is indicated for a great portion of the United States automobile and small truck population, whereby a single alignment system incorporating the improvement herein disclosed may be used to provide accurate front-end alignment with only one adjustment of each wheel. The improved system is particularly useful when aligning vehicles having gross malalignment. Also, since the system utilizes no reference to the rear wheels of the vehicle, it provides expeditious alignment of vehicles having rear wheels which are not aligned with the front wheels, e.g., as in the case of a truck tractor or motor home with dual wheels on the rear axle. -1a-

309465

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