Patent ID: 6923050

Claim:
A method for testing a tire in terms of slip comprising the following steps: (a) causing the tire to roll on a selected ground; (b) applying a predetermined load F Z1 to the tire; (c) applying a predetermined slip to the tire; (d) measuring or estimating the longitudinal force F X1 of the tire; (e) calculating a value of the coefficient of friction μ 1 =F X1 /F Z1 ; (f) repeating the previous steps for calculating at least one other value “i” of the coefficient of friction μ i for at least one other pair “i” of stresses F Xi /F Zi and measuring the associated slip G i ; (g) determining for each of the calculated values of the coefficient of friction the slope α i of the straight line passing through the origin and through (G i , μ i ); (h) calculating coefficients A p by direct calculation or by an appropriate regression from a sufficient number of pairs with (α i , G i ) so as to model a variation curve α i =f(G i , A p ); and (i) calculating an optimum slip enabling a predetermined value of the coefficient of friction G Opt to be attained, by using a predetermined Invariant “Invt”.