Study on the performance of active front steering system
Study on the performance of active front steering system
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DOI：
10.1007/s12239-013-0064-5
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发表时间：
2013-07
影响因子：
1.6
通讯作者：
Y. Xu;M. Ahmadian
中科院分区：
文献类型：
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作者：
Y. Xu;M. Ahmadian
在考虑主动前转向干预的情况下，研究了装有主动前转向装置的转向系统的性能，并建立了动力学模型。首先，根据行星轮系AFS的工作原理和详细的动力学模型，对AFS的运动学和动力学进行了详细的阐述。在此基础上，提出了AFS执行器直流电机电压的基本控制方法。它由比例控制器实现，输入为期望转向比与常规传动比的差值。最后，进行了两次数值模拟。一种是中心操作测试，以演示AFS的基本特征。另一种是通过仿真来验证车速、转向输入频率和AFS干预对转向系统性能的影响。结果表明，所建立的AFS动态模型能够较好地模拟AFS的动态性能。AFS干预对转向手方向盘转向的影响是不可避免的，转向舒适性在一定程度上有所恶化。
The performance of a steering system equipped with active front steering (AFS) device is investigated with the consideration of AFS intervention and a proposed dynamic model. Firstly, the kinematics and dynamics of AFS are illustrated based on the mechanism of AFS with planetary gear set and a detailed dynamic model. Furthermore, a basic control on the voltage of DC motor at AFS actuator is proposed. It is realized by a proportional controller that the input is the difference of desired steering ratio and a conventional gear ratio. Finally, two numerical simulations are carried out. One is on-center handling test to demonstrate the basic characteristics of AFS. The other simulation is to demonstrate the effects of vehicle speed, frequency of steering input and AFS intervention on steering system performance. It is shown that the proposed AFS dynamic model is capable to simulate dynamic performance of AFS. The effect of AFS intervention on turning efforts at hand steering wheel is inevitable and the turning comfort is deteriorated to some extent.