提高车辆转向稳定性的车身主动侧倾控制研究

车辆高速转向时,车身向弯道外侧倾斜,严重时会导致侧翻事故.针对此问题,开展了提高车辆转向稳定性的车身主动侧倾控制研究.首先建立了考虑横摆和侧倾运动的六自由度车辆动力学模型;然后确定了车辆在转向运动时的期望侧倾角,并以此为控制目标设计主动侧倾控制器,使车身实际侧倾角逼近期望侧倾角.在不同行驶工况下,仿真研究了车身侧倾角、乘员感知加速度和横向载荷转移率,并考察了实现主动侧倾控制所需的主动悬架功耗和由主动侧倾引起的悬架动挠度变化.研究结果表明：主动侧倾控制能实现车辆转向时实际侧倾角迅速逼近期望侧倾角,且在复杂行驶工况下依然能使车辆具有良好的行驶稳定性;主动侧倾控制减小了悬架的动挠度峰值,使乘员感知侧向加速度和横向载荷转移率都能快速接近零值,且实现主动侧倾的主动悬架功耗较小,保证了车辆的经济性能.

Improve vehicle steering stability via active roll control

The tilting of vehicle towards the outside of the curve caused by high-speed turning will lead to a rollover accident in severe cases.To address this problem, the Active Roll Control (ARC) of the vehicle body was studied to improve the vehicle steering stability.A vehicle dynamic model with six Degrees of Freedom (DOFs) was established considering both yaw and roll motions.Then, the desired vehicle roll angle was determined, and an active roll controller was designed to make the actual roll angle approach the desired roll angle.Finally, simulations were carried out to obtain vehicle body roll angles, acceleration perceived by occupants and the lateral load transfer rates, and investigate the power consumption of active suspension for roll control as well as the dynamic deflection of the suspension due to the active roll under different driving conditions.The results show that the ARC can make the actual roll angle rapidly approach the desired roll angle, and still ensure driving stability under complex driving conditions;the ARC reduces the peak value of the suspension dynamic deflection, and decreases the lateral acceleration perceived by occupants and the lateral load transfer to zero;the low power consumption of the active suspension for roll control ensures the vehicle''s economic performance.