Commande Floue Optimisée de la Suspension Active d’un Véhicule Soutenu publiquement devant le jury composé de :

Abstract

The main objective of this memoir is the modeling and optimized fuzzy control of a Vehicle Active Suspension (VAS) system. This system has been designed to increase the safety level of the vehicle and to provide greater comfort to the passengers by reducing vibrations regardless of the road profile. Firstly, the mathematical models of the active suspension systems were established for different cases of ¼, ½ and the whole vehicle. To improve the performance of the VAS system, two types of controllers (a PID and a fuzzy PID ) were used to modulate the forces of the suspension actuators. The problem of tuning the gains of these controllers was overcome by optimizing the oscillations of the suspended mass using 'OPTIMTOOL' of MATLAB. Next, an electromagnetic actuator based on a field oriented Permanent Magnet Synchronous Motor (PMS) was used to generate the force profile required for good active vehicle suspension. A simulation study was carried out on the vehicle quarter model of an SAV system in MATLAB /SIMULINK. The results obtained show the good ability of this system to damp well the oscillations due to the disturbances caused by the road profile.