Method and device for the predictive estimate of the wear of the coupling joint between a cooling circuit fan and an engine system in a vehicle

Method for the predictive estimate of the wear of the coupling joint between a cooling circuit fan and an engine system in a vehicle, comprising the steps of: evaluating the difference between a measured engine speed 5 value (61) and a measured fan speed value (62); using the difference for finding, in a stored table (65), an instant wear increment value of the material of said coupling joint; integrating said instant wear increment value by adding it to previous values, starting from a first use of said coupling joint and obtaining an integrated value (66); comparing (67) said integrated value with 10 a tabular value (68), which provides an expected wear value, or tolerable wear, as a function of the overall kilometres covered by the vehicle; said predictive estimate provides a positive indication of the correct instant usage of the coupling joint, if said integrated value is lower than said expected wear value, otherwise it provides a negative indication of an excessive instant 15 wear of the coupling device. (FIG. 1). co cl