汽车专业毕业论文-电动助力转向封面.docVIP

摘 要 Abstract Automotive steering system on the vehicle steering stability have vital role. Automotive steering system already from the traditional mechanical steering, hydraulic steering, electronically controlled hydraulic steering, to todays electric power steering, the future will also transition to wire control steering. Now compare pop electric power steering (EPS) is a kind of depends on directly provide power torque motor power steering system, the main advantage is that motor torque sensor signals and according to provide the corresponding speed signal the instrumentality of torque. Ensure cars are quickly, low-speed driving back when steering light, high speed is stable and reliable, and save fuel, beneficial to the environment, is a gripping modern automobile development theme of high-tech, steering system is an inevitable trend. This paper discusses the characteristics of EPS system, working principle, structure composition and situation at home and abroad, and analyses the electric power steering system dynamics model, it is concluded that the electric power steering system performance evaluation indicators analysis. Keywords: electric power steering ；steering sensitivity ；way feeling 目 录 摘 要 I Abstract II 第一章 绪论 1 1.1 引言 1 1.2 国内外电动助力转向控制技术的研究现状 1 1.3 电动助力转向系统的关键技术及控制难点 2 1.4 电动助力转向系统存在的主要问题及解决的方案 3 1.5电动助力转向的发展前景 3 1.6本文研究的主要内容 4 第二章 电动助力转向系统结构及工作原理 5 2.1 电动助力转向系统工作原理 5 2.2 电动助力转向系统关键部件 6 2.2.1 扭矩传感器 6 2.2.2 电动机 6 2.2.3 电磁离合器 7 2.2.4 减速机构 7 2.2.5 电子控制单元(ECU) 7 2.3 电动助力转向系统的类型 8 2.3.1 转向柱助力式 9 2.3.2 小齿轮助力式 9 2.3.3 双小齿轮助力式 10 2.3.4 齿条助力式 10 2.4 电动助力转向系统的优点 10 2.5 本章小结 12 第三章 电动助力转向系统受力与性能分析 13 3.1电动助力转向系统受力 13 3.2理想转向盘力矩的研究 14 3.3电动助力转向系统性能的主要评价指标 16 3.3.1转向回正能力评价 16 3.3.2转向轻便性评价[20] 17 3.3.3转向盘中间位置操纵稳定性评价 18 3.3.4转向盘振动评价 18 3.3.5转向路感及路感强度 19 3.4电动助力转向系统的动力学模型 21 3.4.1转向系统模型 21 3.5 助力电动机模型 22 3.6 汽车整车模型 23 3.6.1运动微分方程 24 第四章 总结 27 参考文献 28 致谢 30 II