汽车底盘控制子系统集成优化研究  

Simultaneous optimization design of vehicle chassis integrated control system based on genetic algorithm

作　　者：刘显贵[1] 易际明[1] 林勇明 

机构地区：[1]厦门理工学院机械与汽车工程学院,福建厦门361024 [2]国家(厦门)环境保护机动车污染控制技术中心,福建厦门361023

出　　处：《机械设计》2016年第10期90-95,共6页Journal of Machine Design

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)

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。In order to improve the kinematic coupling interference between vehicle chassis control sub-systems, the dynamics models of vehicle suspension and overall vehicle steering were established. The expanded LQG controller was designed based on these models. The integrated control was performed on the electric power steering and active suspension system. The traditional mechanical structure and control parameters were adopted to the serial design method, which might easily cause the system losing the global optimal performance. The integrated system mechanism and control parameters were set as optimization variables to reflect the vehicle dynamics comprehensive performance as the target function. The integrated optimization program was developed based on genetic algorithm to take integrated optimization on the integrated control system. The simulation test results before and after the optimization showed that the mechanical structure parameters and controller parameters of vehicle chassis control system were performed further optimization. The overall performance such as steering agility, handing stability and smoothness were enhanced and improved. The actual vehicle test results showed that the standard deviation of steering wheel moment decreased by 43.10% after the integrated optimization. The portability of the steering was improved. The lateral acceleration of vehicle body and the standard deviation of yaw rate reduced by 28.16% and 19.52%, respectively. The handing stability of vehicle was improved.

关 键 词：遗传算法 汽车底盘系统 集成控制 集成优化 

分 类 号：U463.5[机械工程—车辆工程]