Intelligent Controller Design For A Nonlinear Quarter-Car Active Suspension With Electro-Hydraulic Actuator

Abstract

Nowadays, active suspension system becomes important to the automotive industries and human life due to its advantages in improving road handling and ride comfort. The aims of this project are developing mathematical modelling and design an intelligent control strategy. The project will begin with a mathematical model development based on the physical principle of the passive and active suspension system. Electro-hydraulic actuator was integrated in order to make the suspension system under the active condition. Then, the model will be analysed through MATLAB and Simulink software. Finally, the proportional-integral-derivative (PID) controller and an intelligent controller which is Fuzzy Logic are designed in the active suspension system. The results can be obtained after completing the simulation of the quarter-car nonlinear passive and an active suspension system. From the simulation made through MATLAB and Simulink, the response of the system will be compared between nonlinear passive and nonlinear active suspension system. Besides that, the comparison has been made between Fuzzy Logic and PID controller through the characteristics of a vehicle body and control force from the suspension system. As a conclusion, developing a nonlinear active suspension system with electro-hydraulic actuator for quarter car model has improved the car performance by using a Fuzzy Logic controller. Otherwise, the suspension control system may serve for ride comfort and to support the body of the vehicle. The improvements in performance will improve road handling and ride comfort performance of both systems.