Patent ID: 8136259
Filing Date: 2012-03-20
Classification: G01B

Abstract:
1. A wheel alignment device, comprising: measurement arms, which are rigidly fixed to respective grip elements, said grip elements being adapted to be fixed rigidly to wheels of a vehicle, so that the arms can turn rigidly with the wheels; said arms comprising sensors arranged so as to measure relative angles between the wheels and/or angles of the wheels with respect to gravity, said sensors comprising at least one sensor for measuring a level angle λ a calculation unit connected to said sensors, for computing characteristic angles of the vehicle, calculated starting from measurements generated by said sensors and acquired by said calculation unit, said calculation unit comprising: means for calculating a wheel rotation angle on the basis of the measurement generated by the level sensor; leveling compensation means for compensating first measurements generated by said sensors for measurement errors of said sensors caused by the possible lack of a level orientation of said arms turning rigidly with the wheels of a vehicle before each measurement acquired by said calculation unit; means for calculating runout errors starting from the measurements compensated by said leveling compensation means; runout compensation means for compensating for said runout errors second measurements generated by said sensors and acquired by said calculation unit.