System for controlling vehicle stability using an algorithm for analysing the time variation of a representative parameter

The system has a controller for gradually acquiring wheel spin values and calculating a variation of wheel spin with respect to time. Wet coefficients are calculated by direct calculation or appropriate regression, as long as the variation is greater than a lower limit, to plot a variation curve. A target wheel spin is determined using the last coefficient and a wet algorithm, when the variation is greater than an upper limit. The variation curve is the function of the coefficients and the wheel spin values.