汽车底盘控制子系统集成优化研究

发布时间：2019-02-23 20:07

【摘要】：为了改善汽车底盘控制子系统间的运动耦合的影响,文中在建立了汽车悬架与转向整车系统动力学模型的基础上,设计了扩展的LQG控制器,对电动助力转向和主动悬架系统进行集成控制。针对传统机械结构与控制参数采用串行设计方法易造成系统失去全局最优性能的特点,文中以集成系统机械与控制参数为优化变量,以反映汽车动力学综合性能为目标函数,基于遗传算法编制了集成优化程序,对集成控制系统进行了并行集成优化。优化前后的仿真结果表明,汽车底盘集成系统的机械结构参数和控制器参数得到进一步优化,车辆的转向轻便性、操纵稳定性、平顺性等综合性能也得到提高和改善。进行的实车试验结果也表明:系统经过集成优化后转向盘力矩均方根值下降了43.10%,提高了汽车转向轻便性,车身侧向加速度、横摆角速度均方根值分别下降了28.16%和19.52%,,改善了汽车的操纵稳定性。
[Abstract]:In order to improve the effect of motion coupling between chassis control subsystem, an extended LQG controller is designed based on the dynamic model of vehicle suspension and steering vehicle system. Integrated control of electric power steering and active suspension system. In view of the fact that the serial design method of traditional mechanical structure and control parameters can easily cause the system to lose its global optimal performance, the integrated system mechanical and control parameters are taken as the optimization variables and the objective function is to reflect the comprehensive performance of vehicle dynamics. An integrated optimization program based on genetic algorithm is developed and parallel integrated optimization of integrated control system is carried out. The simulation results before and after optimization show that the mechanical structure parameters and controller parameters of the vehicle chassis integration system are further optimized, and the vehicle steering portability, steering stability, ride comfort and other comprehensive performance are also improved and improved. The test results also show that the root-mean-square value of steering wheel torque decreases by 43.10% after integrated optimization, which improves the steering portability and lateral acceleration of the vehicle. The root-mean-square value of yaw angular velocity decreased by 28.16% and 19.52% respectively, which improved the handling stability of the vehicle.
【作者单位】：厦门理工学院机械与汽车工程学院;国家(厦门)环境保护机动车污染控制技术中心;
【基金】：国家自然基金资助项目(51641507) 福建省自然科学基金资助项目(2013J01208)
【分类号】：U463.1

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