半主动悬架系统对汽车侧翻稳定性的改善

Stability improvement of vehicle's anti-overturn with semi-active suspension system

为提高汽车高速弯道行驶、紧急变线行驶时的安全性,针对被动悬架系统侧翻稳定性比较差的问题,建立了半主动悬架系统模型和控制系统模型。通过控制器调整减振器阻尼力的大小,改变车身侧倾振动状态。模拟分析得到半主动悬架系统使得汽车在高速变线行驶时的侧倾角有效值下降了60 9%,侧倾角加速度有效值下降了64 6%,侧翻因子有效值下降了35.2%。结果表明利用半主动悬架系统可以有效降低汽车非直线行驶时的侧倾角与侧倾角加速度,提高了汽车的侧翻稳定性。

In order to improve the stability of vehicle's anti-overturn in curve driving and sudden turning at high speeds, which affect vehicle driving safety, this paper put forward the semi-active suspension system (SASS) to replace the passive suspension system with poor anti-overturn stability, established the models of SASS and control system. Its suspension damping force was adjust by controller in order to improve the vibration stability of vehicle. Simulation results show that the effective roll angle of vehicle with SASS decreases by 60.9% in sudden turning at high speed, the effective roll angle acceleration and anti-overturn factor decrease by 64.6% and 35.2% respectively. The results show that the SASS can effectively reduce the roll angle and roll angle acceleration in nonlinear driving, improve the anti-overturn stability. SASS is a reasonable solution to improve vehicle safety in nonlinear driving.