DIRECT DETERMINATION OF MAXIMUM FRICTION COEFFICIENT BASED ON MEASUREMENT OF THE CIRCUMFERENTIAL EXTENSION IN A TYRE SIDEWALL

摘要

The invention concerns a method for determining the friction coefficient mu in the contact zone of a tyre on a road surface, which consists in selecting several fixed points in space (that is fixed in the mark related to the vehicle), located at different azimuths along the circumference in at least one sidewall of the tyre, performing as many measurements of circumferential distance variation (extension or contraction) at said fixed points when the tyre is running on the road surface and processing the measurement signals so as to extract therefrom said friction coefficient mu .