驱动桥设计_毕业设计论文.doc

驱动桥设计
摘要
现代工程车辆技术追求高效节能、高舒适性和高安全性等目标。前一项目标与环境保护密切相关,是当代全球性热门话题,后两项目标是车辆朝着高性能化方向发展必须研究和解决的重要课题。转向系统的高性能化是指其能够根据车辆的运行状况和驾驶员的要求实行多目标控制,以获得良好的转向轻便性、较好的路感和较快的响应性。
汽车转向系统是影响汽车操纵稳定性、行驶安全性和驾驶舒适性的关键部分。在追求高效节能\高舒适性和高安全性的今天,电控液压助力转向系统作为一种新的汽车动力转向系统,以其节能、环保、更佳的操纵特性和转向路感,成为动力转向技术研究的焦点。
本文通过查阅相关的文献,介绍了EHPS系统的结构组成和工作原理,在参考现有车型的结构数据的基础上,设计计算转向系的主要参数,确定转向器的结构参数和动力转向部分结构参数,在分析其助力特性的基础上,设计合理的助力特性曲线,并通过MATLAB作出助力特性图,同时提出一种基于车速和转向盘转动角速度的控制策略,根据EHPS系统的特点,通过AMESim和Simulink建立整个系统的模型。通过联合仿真可以得出EHPS系统比HPS系统能提供更好的助力特性和转向路感。
关键词:EHPS;助力特性;结构设计;AMESim与Simulink建模
ABSTRACT
High effective energy saving,fort performance and high security are thegoals of first goal closely concerns with environment protecting,is also the popular topic around the last two goals are the important subjects must be researched and solved in making automobile high make the steering system high performance is that the system can carry out mufti-goals control according to the vehicle states and drive requirements to acquire the steering handiness,better road feeling,better anti-interfering performance and faster response.
The motor turing system is the essential part which affects the automobile operation stability,the travel security and the we pursue highly effective energy conservation,the forrtableness and high electrically hydraulic power steering (EHPS) taking as one kind of new automobile power steering system,it takes the power steering engineering research the focal point by its energy conservation,the environmental protection,the better handling characteristic and changes the road feeling.
According to consult relevant literature, this paper introduces the structure and the principle of EHPS, bases the further study of EHPS on the structural parameter date of a certain type of the light lorry, calculates the main parameters of steering system and power steering and devises the hydraulic circuit of EHPS.
On the basis of the analysis o