A Comparison between a Model-free and Model-based Controller of an Automotive Semi-active Suspension System : Independent Wheel-stations
Résumé
A comparison between two control strategies of automotive semi-active suspension systems is presented by using a pick-up truck model in CarSimTM; the controllers are based on different frameworks. The Linear Parameter Varying (LPV ) controller, considered as model-based controller, includes the constraints of the semi-active damper by using two scheduling parameters; while, the Frequency Estimation-Based (FEB) controller only requires measurements of a wheel-station for defining the damping force according to the objective controls, i.e. is free of a vehicle and actuator model. Since each wheel-station has an independent controller, the global semi-active suspension control system does not include the coupling effect among the four vehicle corners; however this effect is embedded into the controller performance. Experimental data are used to model a MR damper, which is used in each quarter of vehicle. A bounce sine sweep test is used to compare the performance in comfort and road holding of both controllers. Simulation results in CarSimTM shows that the FEB controller has the best comfort and road holding performance; in comparison with the passive suspension system, the pitch angle is reduced 19%, the front and rear suspension deflection decrease 23% and 58% respectively and the tire compression is reduced 3% (front wheel) and 10% (rear wheel).
Origine : Fichiers produits par l'(les) auteur(s)
Loading...