Active suspension system using stability augmentation system for passenger vehicle

Azmi, Muhamad Sahrul Izwan (2017) Active suspension system using stability augmentation system for passenger vehicle. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study presents the use of active suspension system using stability augmentation system in reducing the effects of road surface to the vehicle ride comfort. A control oriented half vehicle simulation model was developed in Matlab and verify with CARS IM 8 software simulation. The vehicle model with active suspension and stability augmentation have been developed in Matlab/Simulink. An investigation of a suitable active control algorithm that can improved vehicle ride comfort was proposed in reducing unwanted vertical motion of passenger vehicle when passing a step or bump. The proposed algorithm known as stability augmentation system (SAS) that is able to reduce the effect of road disturbance, maintains load-levelling and load distribution during vehicle maneuvers in an ideal case for control algorithm parameters tuning is presented. Active suspension based on desired force from the controller and relative velocity between sprung mass and unsprung mass of the vehicle model and shown to be able to consistently provide the actual force to reduce the vibration of the vehicle body. The vehicle is tested at different speeds of 40km/h and l00km/h. Comparison of the simulation results demonstrates the improvement of the vehicle ride comfort.

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