Abstract: The steering angle of the wheel greatly influences the vehicles side tilt. In order to effectively reduce its roll and vibration, the nine-degree-of-freedom active suspension model and four-wheel road excitation time domain model were established. The differential geometric decoupling method was used to decouple the vehicle suspension system and obtain the state while the second-order system simulation in the feedback controller with genetic algorithm could wholly optimize its second-order coefficients and obtain the optimal solution. The simulation results show that the vehicle root roll angle, vertical acceleration of the suspension and elevation of the pitch angle are greatly attenuated after a comparison between the vehicles suspension and passive suspension in the decoupling genetic control and effectively stabilizes the vehicle.

Key words: vehicle engineering, active suspension, four-wheel excitation, steering condition, micro-decomposition coupling, genetic algorithm

摘要： 转向工况下，车轮转向角对车辆的侧倾有很大的影响。为有效减小车辆的侧倾以及振动，建立整车9自由度主动悬架模型和四轮路面激励时域模型，采用微分几何解耦方法，对整车悬架系统进行解耦控制并得到状态反馈，通过对反馈控制器中二阶系统仿真，运用遗传算法对其二阶系数进行全局寻优并获得最优解。仿真结果表明：与被动悬架相比整车悬架经解耦遗传控制后，车身的侧倾角、悬架垂向加速度均方根值、横摆角超调量大幅减小，车辆的稳定性得到有效的控制。

关键词: 车辆工程, 主动悬架, 四轮激励, 转向工况, 微分解耦, 遗传算法