汽车自动变速系统仿真程序开发（本科毕业论文设计）.doc

摘要

双离合器自动变速器(DCT)以其独特的结构特点，克服了传统AMT换档动力中断的缺点，使车辆具有良好的动力性、燃油经济性和驾驶舒适性，成为目前变速器领域内的新的发展方向。双离合器自动变速器是基于手动变速器发展而来的，其工作原理是通过将变速器挡位按奇、偶数分开布置，分别与两个离合器连接，通过离合器的交替切换完成换挡过程，以实现动力换挡。它综合了AMT的优势和AT动力换挡的优点，具有很好的换挡品质和车辆动力性、经济性，比较适合我国目前以手动变速器占主导地位的情况。
本论文针对长安CV11汽车的DCT技术问题进行了一系列的研究，主要工作内容如下：
1.通过对双离合器自动变速器的结构原理和双离合器动力传递机理的分析，以干式双离合器与湿式双离合器的性能对比，以长安CV11传动系为参照，确定本论文的研究对象为干式双离合器自动变速器传动系统的结构型式。
2.为CV11汽车设计了两参数的经济性和动力性换档规律。对双离合器自动变速传动系统换档过程进行了建模仿真。仿真结果表明，装配双离合器的自动变速系统能够实现经济性和动力性的换档要求。
3.根据驾驶员的起步意图和冲击度制定了离合器起步的控制策略。包括制定发动机目标转速，发动机的节气门开度和节气门变化率；计算离合器的接合速度和目标接合量；确定离合器的半接合点；设计离合器执行机构模糊控制器和发动机执行机构模糊控制器。通过MATLAB中SIMULINK工具对起步控制策略仿真，结果满意。


关键词：双离合器自动变速器，动力性，经济性，换档，起步






ABSTRACT

With unique configuration characteristic, dual clutch transmission (DCT) overcomes the shortcoming of power interruption when shifting in traditional AMT, which results in good power performance, fuel economy and driving comfort, and recently it becomes a new development trend in the field of transmission. Dual clutch transmission derives from manual transmission. Its working principle is that the odd gears and the even gears are arranged separately and both are connected with two clutches respectively, gear shifting is realized through alternation of the two clutches, then gear shifting in power is realized. The advantages of AMT and the advantage of gear shifting in power of AT are integrated on it. It has extremely good quality of gear shifting and excellent power performance and fuel economy, and it is suitable to apply in China where manual transmission are in the dominant position.
Focused on the DCT alteration of CV11 vehicle, the following researches have been carried out in this paper:
1. Through analyzing configuration principle and power transmission mechanism, contrasting the characteristic of dry and wet DCT and basing on the transmission parameters of CV11, the configuration of the paper’s research object, dry DCT is fixed.
2. Economy and power shift strategies with two parameters of CV11 vehicle has been designed. Set up simulation model for DCT shift process. The results dedicate that the DCT is able to accomplish the requirement for economy and power shift.
3. The startup strategy is made by the intention of drivers and impact, including calculating the aimed engine speed, the throttle plate angel, varied rate of the throttle plate angel, the engagement speed of clutch, the aimed engagement quantity of clutch, the half-engagement point, and designing the fuzzy controllers of clutch and engine operations. The simulation of the strategy is finished by the SIMULINK toolbox of MATLAB. The result of simulation is satisfied.


Key words：Dual Clutch Transmission (DCT), Power, Economy, Shift, Startup




目 录

中文摘要 Ⅰ
ABSTRACT Ⅱ
1绪论 1
1.1 自动变速器的类型及发展方向 1
1.2 各种自动变速器的特点 3
1.2.1液力自动变速器 3
1.2.2电控机械式自动变速器 4
1.2.3机械无极变速器 4
1.2.4双离合器变速器 5
1.3 DCT系统的开发意义 5
1.4 DCT的关键技术 7
1.5 本论文的主要研究内容 8
2 双离合器式自动变速器结构分析研究 9
2.1 DCT的工作原理及结构型式 9
2.1.1工作原理 9
2.1.2DCT的结构型式 9
2.2 DCT的工作系统 11
2.2.1扭转减振系统 11
2.2.2离合器系统 12
2.2.3液压控制系统 13
2.2.4电子控制系统 14
2.3 双离合器参数确定 14
2.3.1从动盘譆@杉扑 15
2.3.2中间飞轮计算 16
2.3.3飞轮计算 16
2.3.4压盘1计算 17
2.3.5压盘2计算 17
2.3.6离合器盖计算 18
2.3.7传动片计算 18
2.3.8膜片弹簧计算 19
2.4 本章小结 20

3 DCT换档控制策略 21
3.1 动力性换档规律 22
3.1.1升档规律的获取 22
3.1.2降档规律的获取 25
3.2 经济性换档规律 27
3.2.1升档规律的获取 27
3.2.2降档规律的获取 28
3.3 本章小结 28
4 DCT离合器起步控制 29
4.1 发动机目标控制转速的确定 29
4.2 离合器半接合点的判断 29
4.3 离合器平稳接合的最大结合速度 31
4.4 离合器目标接合量控制参数的设定 32
4.5 离合器接合速度控制参数的设定 33
4.5.1根据油门开度控制 33
4.5.2最小接合速度设定 33
4.6 本章小结 34
5 仿真结果及分析 35
5.1 DCT换档仿真 35
5.1.1动力性换档仿真 35
5.1.2经济性换档仿真 37
5.2 起步仿真 38
5.2.1一档起步 38
5.2.2二档起步 40
5.3 本章小结 42
6 结论 43
致谢 44
参考文献 45