Patent ID: 8706317

Claim:
A data processing method for determining a drift value δ of at least one rear tire, a drift value δ′ of at least one front tire, or both δ and δ′, the front or rear tire belonging to a vehicle comprising at least two wheels, the vehicle comprising at least two GPS antennas and a roll value determining module for determining values of roll (β) of the vehicle, the method comprising: for various positions of the vehicle on a track: determining coordinates of the GPS antennas by a coordinate determining module; determining values of roll (β) of the vehicle by a roll value determining module; determining various points of contact between the tire and the track on the basis of coordinates of at least one of the GPS antennas and of various roll values, the said contact points forming a trajectory of the tire on the track by a point of contact determining module; at at least one point of contact from among said various points of contact: determining a tangent to the trajectory of the tire at the level of the said contact point by a tangent determining module; determining an orientation of a wheel plane associated with the tire on the basis of coordinates of the GPS antennas by a wheel plane orientation determining module; determining the drift value (δ or δ′ or both) on the basis of the angle between the tangent and the orientation of the wheel plane by a drift value determining module.