Abstract: In view of that the traditional passive stabilizer bar can’t adjust the roll stiffness according to the roll angle of the vehicle, leading to the proneness to rollover of vehicle when sharp turning at high speed, a new type of adjustable active anti-roll bar (AARB) device is designed. The mathematical model for the roll stiffness of the AARB device is established and the rule of the effects of structural parameters on the roll stiffness characteristics is analyzed. Finally,it is verified by test that compared with traditional passive stabilizer bar, AARB can more effectively control vehicle roll, preventing the vehicle from rollover

Key words: active anti-roll bar, design, roll stiffness, structural parameters, characteristics