Hybrid sliding mode control of semi-active suspension systems

Abstract

In order to design a controller which can take both ride comfort and road holding intoconsideration, a hybrid model reference sliding mode controller (HMRSMC) is proposed.The controller includes two separate model reference sliding mode controllers (MRSMC).One of the controllers is designed so as to force the plant to follow the ideal Sky-hookmodel and the other is to force the plant to follow the ideal Ground-hook model; then theoutputs of these two controllers are linearly combined and applied to the plant asthe input. Also, since the designed controller requires a knowledge of the terraininput, this input is approximated by the unsprung mass displacement. Finally,in the simulation section of this study, the effect of the relative ratio betweenthe two MRSMCs and the knowledge of the terrain on the performance of thecontroller is numerically investigated for both steady-state and transient cases.