毕业设计（论文）-EPS电子助力转向设计精选.docxVIP

摘要近年来，电动助力转向机构（Electric Power Steering，缩写EPS）在乘用车上得到应用，并具有良好的发展前景。与液压助力转向机构（Hydraulic Power Steering，缩写HPS）相比，电动助力转向机构具有结构精巧、节能环保、安全舒适等优点。电动助力转向系统按照电动机布置位置的不同，可以分为：转向柱助力式(Column-assisttype EPS)、齿轮助力式(Pinion-assisttype EPS)、齿条助力式(Rack—assisttype EPS)、直接助力式(Direct-drivetype EPS)四种。本文的主要内容：设计了C型电动助力转向器的蜗轮蜗杆减速机构、齿轮齿条转向器、壳体等结构。建立了C-EPS整套装备的三维模型，并绘制出其二维装配图和部分零件图。同时，选择了常规控制、回正控制、阻尼控制为一体的控制策略。常规控制为驾驶员提供转向助力；回正控制增加转向系统的回正能力；阻尼控制用来增强汽车行驶的稳定性。关键字：C型电动助力转向系统助力特性回正特性AbstractIn recent years,the electric power steering had been used in cars, and has good prospects for developing,Comparing with the hydraulic power steering,the electric power steering has the advantages of compactness, energy conservation, environmental protection, safe and comfortable.theElectric Power Steering system is different according to the position of the motor and can be divided into:column-assisttype EPS,pinion-assisttype EPS,rack-assisttype EPS,direct-drivetype EPS.The main content of this article:It designed the worm and worm wheel of the column-assist type electric power steering, the gear and rack of knuckle mechanism,shell and other mechanism.It had established a complete set of 3D model of the column-assist type electric power steering and drawed the assembly drawing and the parts drawing. Meanwhile, Itselected aintegratedstrategy of conventional control, return-to-center control and damping Control. conventional control provides drivers with the driver steering, Return-to-center control increases the ability of steering system, Damping control is used to improve the stability of the car.key words：Column-assist type EPSDynamical characteristicsReturn-to-center characteristics第一章绪论1.1转向系统概述作为汽车的一个重要组成部分,汽车转向系统是决定汽车主动安全性的关键总成, 如何设计汽车的转向特性, 使汽车具有良好的操纵性能, 始终是各汽车生产厂家和科研机构的重要研究课题。特别是在车辆高速化、驾驶人员非职业化、车流密集化的今天, 针对更多不同水平的驾驶人群,汽车的操纵设计显得尤为重要。汽车转向系统经历了纯机械式转向系统、液压助力转向系统、电动助力转向系统3个基本发展阶段。机械式的转向系统, 由于采用纯粹的机械解决方案, 为了产生足够大的转向扭矩需要使用大直径的转向盘, 这样一来,占用驾驶室的空间很大, 整个机构显得比较笨拙, 驾驶员负担较重, 特别是重型汽车由于转向阻力较大,单纯靠驾驶员的转向力很难实现转向, 这就大大限制