Method for driving a tire on a wear rolling road

A method for testing wear on tires running on a rolling road of a test machine comprising at least one pair of measurement stations, during which the following steps are carried out:

• (a) using construction data of a vehicle and a dynamic equilibrium model, determining relationships between the translational speed Vx and the accelerations Axt, Ayt, Azt at the center of gravity of the vehicle, and (1) longitudinal forces Fx, (2) transverse forces Fy and (3) variations in loads Fz applied by each axle to a chassis of the vehicle, the distribution (4) of the longitudinal forces Fxvg, Fxvd, Fxrg, Fxrd and (5) of the variations in loads Fzvg, Fzvd, Fzrg, Fzrd applied by the ground to each of the wheels, and (6) the camber angle Ac of each of the wheels;
• (b) continuously measuring and recording the translational speed Vx and the accelerations Axt, Ayt, Azt at the center of gravity of the vehicle when the vehicle is travelling on a predetermined wear test course;
• and
• (c) disposing the two wheels belonging to a same axle on each of the measurement stations of the test machine,
• wherein, using the relationships determined in step (a) and depending on values of the translational speed Vx and longitudinal acceleration Axt, transverse acceleration Ayt and vertical acceleration Azt recorded in step (b), the values of the longitudinal force Fx, of the transverse force Fy and of the variation in load Fz applied by the axle to the chassis of the vehicle, and the values of camber angle Ac, of variations in loads Fzg, Fzd and of longitudinal forces Fxg, Fxd applied by the ground to each of the wheels of the axle are determined at all times,
• wherein the values of camber angle Ac and the values of the longitudinal forces and variations in loads previously calculated are applied to each of the wheels at all times, and
• wherein values of the transverse forces Fyg, Fyd to which each of the wheels of the axle are subjected are measured and the drift angle Ad of each of the wheels is varied such that a sum of the transverse forces Fyg+Fyd resulting from skewing of the tires is equal at all times to the transverse force Fy applied to the center of the axle and such that a difference in drift δ(Ad) between the two wheels respects a variation in parallelism calculated on a basis of the characteristics of the axle.