【作者】 赵君卿；

【导师】 王其东；

【作者基本信息】 合肥工业大学 ， 车辆工程， 2005， 硕士

【摘要】 各种电子技术和控制系统在汽车底盘上的广泛应用,大大改善了汽车的行驶平顺性和操纵稳定性等动力学特性。但是,这些控制系统都是针对提高车辆的某一项性能指标而设计的,整车性能的改善则依赖于汽车底盘各子系统的协调工作。基于此,本文对直接影响车辆的行驶平顺性和操纵稳定性的两个电子控制系统——主动悬架(ASS)和电动助力转向系统(EPS)进行了集成控制研究。首先建立了主动悬架和电动助力转向的动力学模型,采用两种集成控制策略实现了集成控制:一是分别控制ASS和EPS,通过两者状态变量的耦合实现参数传递从而实现集成控制;二是设计一个LQG控制器,实现对两者的集成控制。在此基础上,针对传统的先设计机械结构后设计其控制系统易失去全局最优的缺陷,提出了对主动悬架和电动助力转向系统的结构参数和控制参数同时进行优化设计研究。考虑到这种并行优化设计的多变量、目标函数复杂的特点,选用模拟退火算法进行优化计算。仿真计算和道路试验均表明经过集成控制和集成优化设计后,汽车的行驶平顺性和操纵稳定性等综合动力学特性得到了改善。此集成控制和集成优化的方法还可以应用于汽车底盘系统的综合设计和其他机电控制领域。更多还原

【Abstract】 Kinds of electronic control techniques and control systems are greatly developed and widely applied to improve ride comfort and handling stability of vehicles. All these control systems are aimed to improving one performance of vehicle, but the improvement of the whole dynamics of vehicle depends on the cooperative work among various control systems of chassis. Based on this point, this paper carries through the study of integrated control in active suspension system (ASS) and electric power steering system (EPS).They are two sub-control systems of chassis which directly influence ride comfort and handling stability of vehicles. First, the paper analyzes the relationship of ASS and EPS .Then, a model of a full vehicle is set up. With two kinds of integrated control modes, control each separately or with one LQG controller to carry out integrated control. Finally, this paper presents the method to integrate the structure and control parameters of ASS and EPS considering traditional design method of vehicle ASS and EPS always design control parameters following structure parameters and it can not obtain the global optimum performance for the system. Considering the parameters are much and the object function is complex, simulated annealing algorithm is chosen. The effectiveness of the proposed simultaneous optimization method to improve ride comfort and handling stability of vehicles is proved by theory analysis, simulation and test. The method can also be used in the field of chassis design or other mechanical and electrical system design.更多还原