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A comparison between two control strategies of automotive semi-active suspension systems is presented by using a pick-up truck model in CarSim™; 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. Each wheel-station has an independent controller and, experimental data are used to model an MR damper in each quarter of vehicle. A running test on the road based on ISO 8606 is used to compare the performance in comfort and road holding of both controllers. Simulation results in CarSim™ show that the LPV approach has the best comfort performance; in comparison with the passive suspension system, the pitch angle is reduced 36% and the vertical chassis displacement 24%. However, the FEB controller is better for road holding: a lower suspension deflection with a tire compression reduced 30%. © 2013 IFAC.
Tudón-Martínez, J. C., Morales-Menendez, R., Ramírez-Mendoza, R., Sename, O., & Dugard, L. (2013). Comparison between a model-free and model-based controller of an automotive semi-active suspension system. In IFAC Proceedings Volumes (IFAC-PapersOnline) (Vol. 46, pp. 869–874). IFAC Secretariat. https://doi.org/10.3182/20130204-3-FR-2033.00039