In this paper, a comprehensive three-dimensional heavy vehicle model is developed to investigate the effectiveness of an open-loop roll instability control. The steering system compliance, roll steer, bump steer, ackerman steer and wrap steer are incorporated in the vehicle model, along with comprehensive tire model and ABS algorithm. Time delays due to driver’s reaction and the transportation lag of the braking system are characterized by a variable called reaction delay. The rollover indicators in terms of roll safety factor, tractor and trailer lateral accelerations and roll angles, and the rearmost axle roll angle are investigated for their effectiveness for open-loop roll stability control in various cornering and evasive maneuvers, road conditions, braking efforts, and different reaction delays.

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