Abstract:

A differential braking anti-rollover active control strategy was proposed combining dynamic load transfer rate and vehicle yaw rate to improve the anti-rollover ability for commercial heavy-duty vehicles driving in turn at high-speed. A dynamics model was established for the vehicle rollover with 3-freedomdegree
including the lateral, the yaw and the roll motions. Joint digital-simulations were performed by TruckSim and Matlab/Simulink at high-speed fishhook condition and at double lane change condition by using a linear quadratic optimal control theory with load-transfer-rate (LTR) and vehicle-yaw-rate as rollover dynamic-stabilization-factors. The results show that the lateral acceleration is improved by a rate of 6.75% and the lateral load-conversion is improved by a rate of 33% when adopted this strategy, meanwhile eventually turns over rollover for conventional vehicle when reaching rollover limit. Therefore, this strategy can improve the rollover control capability and the lateral stability of heavy vehicles under high-speed aggressive conditions.

Key words: automobile safety , dynamic stability , anti-rollover , optimal control , differential braking