汽车自适应巡航系统车距控制策略研究

摘要

Due to nonlinear and uncertain problems of the automotive adaptive cruise control system,the traditional method,regarding the nonlinear system as the linear system approximately,can't meet the accuracy,stability and rapidity of the system.So an adaptive cruise controller,based on fuzzy control theory,is designed.According to the calculation and inference about the distance difference and the relative speed,the system can adjust the accelerated speed of the rear vehicle at any time,guaranteeing the rear vehicle can follow the front vehicle under safe distance.We make simulations under different conditions by establishing a system model in the Matlab/Simulink.Simulations demonstrate the inverse longitudinal dynamic model established and the adaptive cruise control system can achieve the adaptive cruise function,which can also guarantee the traceability,security and adaptability of the system.%由于汽车自适应巡航控制系统的非线性和不确定性等问题,传统的非线性系统等效线性化方法难以满足系统的精度、稳定度和快速性的要求,因此提出了一种基于模糊控制理论的自适应巡航控制器的设计方法.通过对汽车距离差和相对速度的计算和推理,实时调整本车加速度,保证本车能够在一定的安全车距下跟随前车.通过在Matlab/Simulink中建立系统模型,在不同的工况下进行仿真.仿真结果表明,建立的汽车逆纵向动力学模型和自适应控制系统能够实现汽车的自适应巡航功能,并且保证良好的跟踪性、安全性和适应性.