Abstract
As the important performance of automobile, the vehicle handling stability has always been the focus of the research. The steering-by-wire (SBW) system is a major innovation to the traditional steering system, which brings new challenges to the research on the vehicle handling stability. In order to improve the vehicle handling stability and active safety of SBW, the multidomain model of SBW is established on the basis of proper simplification. A new vehicle handling stability evaluation method and its expression are proposed. The system parameters, vehicle handling and stability are studied by multidisciplinary design optimization (MDO), and selection of the system frequency response and time domain response characteristics have important influence on the key parameters analyzed in SBW system performance. The results show that the vehicle handling stability is significantly higher after the parameter optimization, which can be used to guide the parameters design and matching of the steering system.
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