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In this paper the vibration attenuation problem in automotive suspension systems is presented. A robust active vibration control strategy based on sliding mode and differential flatness control techniques is proposed as a solution alternative of this problem. This active vibration control scheme only requires position measurements of the wheel and car body. State algebraic on-line estimation is used to avoid the use of sensors of acceleration and velocity. Simulation results are included to show the dynamic performance and robustness of the proposed active suspension system.