主动前轮独立转向系统分析与研究

Study on Active Independent Front Steering System 

摘要:

为了提高车辆的操稳性,提出了新型主动前轮独立转向系统,介绍了主动前轮独立转向的工作原理和结构形式,建立了系统数学模型；提出了主动前轮独立转向的控制策略,上层控制器采用PI控制,由横摆角速度偏差得出总控制转角,下层控制器负责内外侧转向轮的判断以及计算内外侧转向轮具体的转角；在仿真软件MATLAB/Simulink里进行了控制策略有效性仿真,仿真结果说明对于不足转向车辆,主动前轮独立转向系统能比传统的主动前轮转向系统更有效地提高车辆操纵稳定性。

Abstract:

The Active Independent Front Steering (AIFS) system is proposed in order to improve vehicle handling stability. The principle and structure of AIFS are introduced and the mathematical model of AIFS is built. The control strategy of AIFS is proposed and the controller includes two layers. The upper controller adopts PI control strategy and it calculates the total control angle according to the error of ideal yaw rate and actual vehicle yaw rate. The lower controller distinguishes the inner and outer road wheel, and calculates their respective steering angle. Simulation is carried out in MATLAB/Simulink to validate the effectiveness of control strategy. Simulation results show that AIFS has better performance in terms of improving vehicle handling stability compared with traditional active front steering for understeer vehicles.