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|Title||Fuzzy Control Strategy for the Low Bandwidth Active Suspension System|
In this study, we propose new control strategies for the control of an electro-hydraulically controlled active suspension system. A PID, along with fuzzy control is employed to form a switch between bump isolation and inertial load rejection strategies. Also, PID and optimized PID control are applied for different control approaches throughout this study. Our study propose a special construction of the suspension system where the electro-hydraulic actuator is to be placed in series with the conventional passive one to form a special case of low frequency active suspensions. The full dynamics of the electro-hydraulic servo valve and hydraulic actuator are employed. The proposed control strategies are applied to a quarter car model. Response of the three proposed control strategies is tested for different road profiles and riding conditions including car chassis rolling effect when cornering and pitch movements when braking/ accelerating. Results show superior performance of our modified controllers, especially the optimized PID approach, over passive suspensions and many other controllers of previous studies. Simulations of the optimized PID approach show that our proposed controller provides better passenger comfort as it lowers maximum body acceleration by 94.3% and with reduction in body travel by 98.8% of that of passive one. The three proposed control strategies also show better road handling and car stability over a whole range of road and inertial disturbances. Control strategies introduced in this study are also applied to a half-car model to test mutual reactions between front and rear sides of the vehicle and our control strategies show superior performance in ride quality over passive suspension.
|Publisher||الجامعة الإسلامية - غزة|
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