A fuzzy increment controller is designed aimed at the vibration system of automobile active suspension with seven degrees of\nfreedom (DOF). For decreasing vibration, an active control force is acquired by created Proportion-Integration-Differentiation\n(PID) controller.The controller�s parameters are adjusted by a fuzzy increment controller with self-modifying parameters functions,\nwhich adopts the deviation and its rate of change of the body�s vertical vibration velocity and the desired value in the position of the\nfront and rear suspension as the input variables based on 49 fuzzy control rules. Adopting Simulink, the fuzzy increment controller\nis validated under different road excitation, such as thewhite noise inputwith four-wheel correlation in time-domain, the sinusoidal\ninput, and the pulse input of C-grade road surface. The simulation results show that the proposed controller can reduce obviously\nthe vehicle vibration compared to other independent control types in performance indexes, such as, the root mean square value of\nthe body�s vertical vibration acceleration, pitching, and rolling angular acceleration.
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