Performance Comparison of Active Suspension for Ride Comfort Using Linear Quadratic Regulator (LQR) and Fuzzy Logic Controller (FLC)

The main purpose of a suspension is to reduce the vibration that occurs when driving on the road. However, this vibration still exists in passive suspension which contain high frequency causing reduced ride comfort and driveability. Besides that, the effects of using passive suspension can also cause damage to certain components of a car when passing through holes on the road and when there is a high bump. To overcome this problem, a comparison has been made based on the performance between passive suspension, Linear Quadratic Regulator (LQR) and Fuzzy logic Controller (FLC) that used specific model parameters based on previous studies. This investigation focusses on two-degree of freedom (DOF) quarter car suspension using the MATLAB/SIMULINK toolbox. Several road profiles were used, and analysis based on car body displacement, car body acceleration, suspension travel and space rattle were carried out. The result of the analysis shows that both controllers can reduce vibration. However, FLC provides the best performance compared to LQR.