LPV modelling and control of semi-active dampers in automotive systems
Résumé
The aim of this chapter is to emphasize the interest of the LPV methodology for suspension modelling and control. Indeed, the main features of a semi-active automotive suspensions are: * the damper can only dissipate energy, * the damper has a non linear behavior which is important to account for in the control design step. New methodologies have been recently designed to separately cope with these constraints [9, 34, 38]. In this study, recent developments are presented to: * first, develop an LPV model for an automotive suspension system starting from a non linear semi-active damper model, * second, using an original LPV representation of the dissipativity of the semiactive damper, develop an ad-hoc Hinfinity/LPV controller. The whole LPV model is used to design a polytopic H-infinity controller for an automotive suspension system equipped with a Magneto-Rheological semi-active damper. This controller aims at improving ride comfort and/or road holding, depending on the required specifications. Some simulations results are given on realistic vehicle and damper models (whose validation on real data has been performed), allowing to show the efficiency of the approach.