The purpose of vehicle suspension system is to improve ride comfort and road handling. This paper presents the application of P controller, PI controller and PID controller to control the vibration of bus suspension system. 1/4 th model of bus suspension system is used to simplify the problem. A open loop response of bus suspension system is developed by using equations of 1/4 th model of bus suspension system by using the Matlab/Simulink. The response of open loop bus suspension system is obtained by using equation and state space model. For controlling the bus suspension use the feedback controller. In this paper P controller, PI controller and PID controller are used to control the vibration to give the smooth response of bus suspension system. From the bus suspension system model, the dynamic equation is obtained by using the Newton's law. Then, this dynamic equation will be transfer into the Matlab to get the transfer function using the built in function. In this paper 1/4 th model of the bus is used to design a simple bus suspension system . The model of bus suspension system is shown below -
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