This paper study the magnetorheological fluid damper of controlled and uncontrolled of a semiactive suspensions system as an application under different rode profiles (step, sin, and random input) for the automotive. Bingham plastic model is adopted for the mathematical modeling and analyzes the hysteretic behavior of the MR fluid damper. The PID controller is used for the control processes. The study presented the dynamic response of the suspension system with MR damper with different road profiles and show the forcevelocity, and response of body automotive. PID controller uses to improve the dynamic behavior of the MR suspension system by control on the damping force. The results have shown that the input current play an important role regarding the dynamic response and hysteric behavior by reducing the dynamic characteristics of the automotive suspension. Also, The PID controller has sooth effective to remove the vibration without any irregular behavior.

PID controller, Magnetorheological Damper, Damping force, Semi-active suspension system.