AVL BOOST全可变气门米勒循环发动机的热力学性能分析
关键词 米勒循环 全可变气门机构 热力学 性能仿真
毕业论文设计说明书外文摘要
Title Thermodynamics Analysis of the Fully Variable Valve Train Miller Cycle Engine
Abstract
The main task of this subject is to use the AVL BOOST software for performance simulation and thermodynamics analysis of the Miller cycle engine.Based on the fully variable valve train(FVVT), the Miller cycle can be realized in a four-stroke gasoline engine through the valve lift curve redesign,which mainly contents two different kinds of operation schemes: early intake valve closure(EIVC) and late intake valve closure (LIVC).According to the valve lift curve redesign schemes, the working process of the Miller cycle engine is modelled in one dimension and then simulated by the AVL BOOST software.After that，the further study should be done to figure out the influence of the compression ratio、expansion ratio、inlet pressure and EGR rate on the Miller cycle engine in tractive performance and fuel economy respectively.The conclution,which can be drawn from all the study mentioned above,is that increasing the engine compression ratio、 expansion ratio、 inlet pressure or the EGR rate appropriately can make a great improvement in thermal efficiency and fuel economy of the Miller cycle engine.
Keywords Miller Cycle Fully Variable Valve Train Thermodynamics Simulation
目 次
1 引言 . 1
1.1 课题背景 .1
1.2 课题研究的目标与内容 .3
2 米勒循环发动机的气门运行规律方案设计 4
2.1 方案设计的基本要求.4
2.2 方案设计的具体内容与可行性分析.4
3 基于AVL BOOST软件的米勒循环发动机一文仿真模型的建立.7
3.1 AVL BOOST软件简介 ▪7
3.2 基于AVL BOOST软件的米勒循环发动机一文建模 8
4 米勒循环发动机热力学性能的仿真分析 17
4.1 压缩比对米勒循环发动机热力学性能的影响规律 ▪17
4.2 进气压力对米勒循环发动机热力学性能的影响规律 .18
4.3 膨胀比对米勒循环发动机热力学性能的影响规律 ▪19
4.4 EGR率对米勒循环发动机热力学性能的影响规律 21
4.5 本章小结 .22
结论 24
致谢 25
参考文献26
1 引言
1.1 课题背景
1.1.1 米勒循环的研究现状
1.1.2 可变气门技术的研究现状
1.2 课题研究的目标与内容
本课题的主要目标是利用AVL BOOST软件仿真模拟与分析研究米勒循环发动机的热力学性能，其具体研究内容如下：
（1）应用全可变气门技术在四冲程汽油机中实现米勒循环的气门运行规律方案设计；
（2）建立基于AVL BOOST软件的米勒循环发动机一文仿真模型；