Process and device for checking a vehicle suspension by measuring the damping factor of an oscillating suspension signal.

摘要

1. Method for checking the suspension of a vehicle comprising the stages consisting of : i) generating by means of a sensor (10, 11, 12, 13) an electrical signal representative of the oscillations of the suspension, ii) filtering (25) the electrical signal in order to retain solely the oscillations generated by the nonsuspended masses of the vehicle and the spring effect of the tyre, iii) determining (40) the ratio between two extremes of the filtered signal, characterised by the fact that the filtering stage ii) consists of retaining solely the oscillations generated at a frequency of the order of 12 Hz and in particular of eliminating the oscillations created at a frequency of the order of 1 Hz, as well as frequencies greater than 15 Hz, the method also being characterised by the fact that it comprises the additional stage consisting of iv) determining (95) the value of a parameter representative of the coefficient of viscous friction c of the shock absorber on the basis of the relationship see diagramm : EP0220985,P11,F1 in which : E and G represent constants linked with the characteristics of the vehicle, and S11 and S12 represent the amplitudes of two successive extremes.