Adjusting stiffness of air spring and damping of oil damper using fuzzy controller for vehicle seat vibration isolation

In this paper we present one of the concepts of vehicle seat vibration damping, using a fuzzy controller. We used a fuzzy controller as a part of a semi-active vehicle suspension system, which consists of semi-active air spring and semi-active damper. System is implemented between the cabin floor and vehicle seat. Fuzzy controller is designed to adjust the stiffness of the air spring and damping of the oil damper, in order to isolate the vertical vibrations that are being caused by rough road surfaces. Input data for fuzzy controller are cabin floor acceleration, vehicle seat deflection and velocity of the vehicle seat deflection. Measure of the quality of suspension is the SEAT value, which is calculated as a quotient of effective seat vertical acceleration and effective cabin vertical acceleration (ISO 2631-1 standard).