Abstract— The active suspension required energy input levels and the high component costs. In this work, the Limited bandwidth hydro-pneumatic active suspension (LBA) is used and it has all the advantages of active system except that the actuator is limited at 6 Hz bandwidth, thus making it economical on power consumption and cost. The aim of this study is to develop four degrees of freedom (DOF) half vehicle model including the Limited-Bandwidth hydro-pneumatic active suspension system. The LQR and Fuzzy Logic Control (FLC) are used to evaluate the vehicle ride performance for Limited bandwidth hydro-pneumatic active suspension. The result indicated that the limited-bandwidth Hydro-pneumatic active suspension with LQR gives better ride performance compared with the passive suspension system. On the other hand, the FLC improved the vehicle ride performance in terms of front and rear body acceleration by 4% and 7.5% respectively compared with limited-bandwidth Hydro-pneumatic with LQR. The power demand for limited-bandwidth Hydro-pneumatic with LQR and FLC are evaluated and discussed. Several control strategies for active and slow active are used [6-9]. Recently, a Model Reference Control (MRC) strategy for active suspension System is developed [10]. The MRC technique utilizes both wheelbase preview concepts and suspension look-ahead preview and the MRC methodology depended on an ideal hybrid skyhook-groundhook concept and also MRC technique utilizes 8 Proportional-Integral-Derivative controllers for body and each wheel control. Their results showed that, the proposed MRC strategy with the PID controllers are able to track the performance of the ideal hybrid skyhook-groundhook system, and provided significant improvements in both ride comfort and road holding. It is clear from the previous literature that more investigations of limited-bandwidth Hydro-pneumatic active suspension are required. In this work, the LQR and Fuzzy Logic Control (FLC) are used to evaluate the vehicle ride performance for Limited bandwidth hydro-pneumatic active suspension (LBA). Also, the power demand for LBA with LQR and FLC are evaluated and discussed. |
