The main goal of introducing Active Suspension System in vehicles is to reduce the vehicle
body motion under road obstacles which improves the ride comfort of the passenger. In this
paper, the Full Car Model (FCM) with seven Degrees of Freedom is considered and simulated
by MATLAB/Simulink. The Terminal Sliding Mode Controller (TSMC) and Fractional Order
Terminal Sliding Mode Controller (FOTSMC) are designed to enhance the ride quality, stability
and passenger comfort for FCM. The designed FOTSMC has the ability to provide higher
control accuracy in a finite time. The performances of the designed controllers are evaluated by
measuring the vehicle body vibration in both angular and vertical direction under bump input and
ISO-8608 random input against passive suspension system. The Frequency Weighted Root Mean
Square (FWRMS) and Vibration dose value of Body Acceleration as per ISO-2631 are evaluated
for FOTSMC, TSMC and PSS. The stability of the FCM is proved by Lyapunouv theory. Further
analysis with sprung mass and speed variation of FCM demonstrate the robustness of proposed
controller. To investigate the performances of designed controllers, comparison is made with
existing Sliding Mode Controller (SMC) which proves that the designed FOTSMC performs
better than existing SMC.
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