没有合适的资源?快使用搜索试试~ 我知道了~
资源推荐
资源详情
资源评论
江苏大学硕士学位论文
I
摘要
双离合器自动变速器(
DCT
)在我国拥有广泛的市场基础及广阔的推广平台,
因此
DCT
现已成为诸多汽车生产商和设计单位研发的重点领域,而
DCT
在研发
过程中最关键的两项技术便是起步与换挡技术。本文选取奇瑞
A3
汽车作为研究
对象,针对
DCT
的起步和换挡过程,建立基于
MATLAB/Simulink
平台的仿真模
型。通过仿真检验该款汽车
DCT
起步及换挡性能的可靠性并验证所制定的起步
与换挡策略的合理性,为该款汽车双离合器自动变速器的设计和研发提供数据支
撑和改进依据。本文的具体研究工作包括:
(
1
)基于
5
速干式
DCT
,分析双离合器自动变速器的结构,并指出单输出
轴式
DCT
的结构特点。分析单输出轴式
DCT
的工作原理,指出起步和升、降挡
工况下的动力传递路线,并对
DCT
系统进行受力分析。
(
2
)推 导
5
速干式
DCT
车辆传动系统在起步、换挡和稳定行驶工况下的传
动系统动力学方程,包括起步工况及前进状态
8
个工况的传动系统动力学方程。
分析车辆行驶阻转矩模型,并构建发动机和离合器动力学模型。
(
3
)搭建
DCT
起步与换挡的
Simulink
模型,包括
DCT
系统的
Simulink
模
型、
DCT
系统控制策略模块及仿真结果模块。其中
DCT
系统的
Simulink
模型包
括起步和换挡工况的系统模型及离合器模型,
DCT
系统控制策略模块包括目标
挡位决策模块和传动系统数学模型切换逻辑模块。
(
4
)在滑摩功和冲击度的约束下,分别制定
DCT
车辆起步和换挡过程中离
合器和发动机的控制策略,并在
Simulink
平台上搭建起步和换挡的控制策略模
型。为便于研究,根据搭建好的
DCT
系统仿真模型,搭建起在
40
%和
60
%油门
开度下的
DCT
系统起步与
1
挡换
2
挡简化仿真模型。通过仿真可以直观地看到
离合器、发动机及车辆的参数曲线。仿真结果表明,所搭建的
DCT
起步与换挡
Simulink
仿真模型能够很好地模拟双离合器的动力学特性,所制定的起步及换挡
控制策略能够满足车辆起步和换挡过程中冲击度和滑摩功的理论要求,本文采用
的起步和换挡的仿真方法及控制策略具有较好的工程指导意义。
本文基于 5 速干式 DCT 动力学系统的完整建模可为其他形式 DCT 动力学系
统的建模提供良好借鉴,并且针对 DCT 起步及换挡过程中离合器及发动机控制
策略的研究可为改善 DCT 起步及换挡的品质提供思路。
基于 MATLAB/Simulink 的 DCT 起步与换挡仿真研究
II
关键词:双离合器自动变速器,仿真,起步控制,换挡控制,离合器控制,冲击
度,滑摩功
江苏大学硕士学位论文
III
ABSTRACT
Dual clutch transmission (DCT) has a wide range of market infrastructure and
promote broad platform in our country, so DCT has become the key research field of
many car manufacturers and design department, and the start and shift technology are
two key technologies in the development process of DCT. In this paper, Chery A3 is
selected as the research object, and the simulation model based on
MATLAB/Simulink platform is built according to the starting and shifting process of
DCT. The rationality of start and shift strategy is tested and the reliability of DCT
vehicle starting and shifting performance is verified through simulating. Providing the
data support and improvement basis for the design and development of the dual clutch
automatic transmission for this car. The specific research work in this paper includes:
Firstly, based on 5 speed dry DCT, the structure of double clutch automatic
transmission is analyzed, and the structure characteristic of single countershaft type
DCT is pointed out. The working principle of single countershaft type DCT is
analyzed, the power transmission route under starting and upshifting and downshifting
working conditions are pointed out, and the force analysis of DCT system is carried
out.
Secondly, the dynamic equations of transmission system of 5 speed dry DCT
vehicle transmission system under starting, shifting and steady running working
conditions are deduced, including the start-up working condition and 8 states of
forward working conditions. The model of vehicle driving resistance torque is
analyzed, and the dynamic model of engine and clutch is constructed.
Thirdly, Simulink model for start and shift of DCT is established, including
DCT Simulink model, DCT system control strategy module and simulation result
module. The Simulink model of DCT system including the model of clutch starting
and shifting conditions, and the DCT system target shift decision module including
the target gear shift rule decision logic and the mathematical model of switching logic
module of drive system.
Finally, under the constraint of the slipping friction work and the degree of jerk,
the DCT vehicle starting and shifting process of the engine and clutch coordinated
control strategy is developed, and the model of starting and shifting control strategy
基于 MATLAB/Simulink 的 DCT 起步与换挡仿真研究
IV
on Simulink platform is built. For simply research, according to the DCT system
simulation model which was built before, a simplified DCT system simulation model
of starting and first gear shifting to second gear in 40% and 60% of the throttle valve
position is built. Through simulation, the parameter curves of clutch, engine and
vehicle can be seen intuitively. The simulation results show that the DCT starting and
shifting Simulink simulation model can well simulate the dynamic characteristics of
the dual clutch, and the starting and shifting control strategy can well meet the
requirements of the slipping friction work and the degree of jerk in the process of
vehicle starting and shifting, and the simulation method and control strategy of
starting and shifting in this paper have good engineering guidance significance.
The completely modeling based on the model of 5 speed dry DCT dynamical
systems provide a good reference for other forms of DCT dynamical systems, and the
research on clutch and engine control strategy during the process of starting and
shifting can provide ideas to improve the quality of DCT starting and shifting.
Keywords: Double Clutch Transmission; Simulation; Starting Control; Shifting
Control; Clutch Control; Degree of Jerk; Friction Work
江苏大学硕士学位论文
V
目录
第一章 绪论 ................................................................................................................. 1
1.1 选题背景及研究意义 ..................................................................................... 1
1.2 DCT 起步与换挡仿真的国内外研究现状 ..................................................... 2
1.2.1 DCT 仿真方法研究现状 ...................................................................... 2
1.2.2 起步及换挡控制策略研究成果 .......................................................... 2
1.3 论文技术路线及主要研究内容 ..................................................................... 4
1.3.1 论文技术路线 ...................................................................................... 4
1.3.2 论文主要研究内容 .............................................................................. 5
1.4 本章小结 ......................................................................................................... 5
第二章 干式单输出轴式双离合器自动变速器系统分析 ......................................... 6
2.1 干式单输出轴式双离合器自动变速器的结构 ............................................. 6
2.1.1 双离合器系统 ...................................................................................... 6
2.1.2 扭转减振器系统 .................................................................................. 7
2.1.3 机械齿轮传动系统 .............................................................................. 7
2.1.4 控制系统 .............................................................................................. 8
2.2 干式单输出轴式双离合器自动变速器的工作原理 ..................................... 9
2.3 DCT 系统受力分析 ....................................................................................... 11
2.4 本章小结 ....................................................................................................... 12
第三章 DCT 系统动力学模型的建立 ...................................................................... 13
3.1 系统变量定义 ................................................................................................ 13
3.2 DCT 车辆传动系统动力学模型 ................................................................... 14
3.2.1 起步工况(C0)模型 ....................................................................... 15
3.2.2 前进工况模型 .................................................................................... 16
3.2.2.1 奇数挡稳定行驶工况(C1)模型 ........................................ 17
3.2.2.2 奇数挡行驶、下一挡位同步器预接合工况(C2)模型 .... 18
3.2.2.3 奇数挡行驶、下一挡位同步器接合完成工况(C3)模型 20
3.2.2.4 奇数挡换偶数挡(C4)模型 ................................................ 21
3.2.2.5 偶数挡稳定行驶工况(C5)模型 ........................................ 23
3.2.2.6 偶数挡行驶、下一挡位同步器预接合工况(C6)模型 ......... 24
3.2.2.7 偶数挡行驶、下一挡位同步器接合完成工况(C7)模型 ..... 25
3.2.2.8 偶数挡换奇数挡工况(C8)模型 ............................................. 27
3.3 整车动力学模型 ........................................................................................... 28
3.4 发动机动力学模型 ....................................................................................... 29
3.5 离合器动力学模型 ....................................................................................... 30
3.5.1 离合器传递转矩模型 ........................................................................ 30
3.5.2 离合器摩擦系数模型 ........................................................................ 31
3.5.2.1 静态摩擦模型 ......................................................................... 31
3.5.2.2 动态摩擦模型 ......................................................................... 34
3.5.2.3 离合器动态摩擦模型 ............................................................. 35
3.6 本章小结 ....................................................................................................... 38
剩余84页未读,继续阅读
资源评论
2201_75761617
- 粉丝: 18
- 资源: 7339
上传资源 快速赚钱
- 我的内容管理 展开
- 我的资源 快来上传第一个资源
- 我的收益 登录查看自己的收益
- 我的积分 登录查看自己的积分
- 我的C币 登录后查看C币余额
- 我的收藏
- 我的下载
- 下载帮助
安全验证
文档复制为VIP权益,开通VIP直接复制
信息提交成功