Research on the Transmission Ratio of Active Front Steering System
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摘要: 分析主动转向系统(active front steering system,AFS)传动机构的工作原理,建立AFS传动机构的数学模型,根据汽车二自由度模型确定汽车的系统稳态横摆角速度增益曲线,选取合适的系统横摆角速度增益值设计转向传动比曲线以及转向轴叠加角曲面,建立装备AFS整车的联合仿真模型,依据转向轴叠加角曲面控制转角电机实现转向系统的主动转向。仿真结果表明:AFS传动比曲线设计方法合理有效。Abstract: The model of transimission mechanism is built on the base of the operating principle of active front steering system(abbreviated to AFS).According to steady-state yaw velocity gain of steering system,appropriate fixed yaw velocity gain is chose to design transmission ratio curve of AFS.Based on this curve,superposition angle curve of steering shaft is established.The co-simulation model of the car with AFS is developed which realizes active front steering through controlling the motor according to the superposition angle curve.The co-simulation results show that the design method of AFS transmission ratio is reasonable and effective.
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