人工智人-家居设计-缸内直喷汽油机智能起停关键技术研究.pdf

Abstract

II

Abstract

Nowadays engine power consumption and exhaust emissions has become a focus of

global attention, smart start-stop technology has remarkable effect of energy conservation

and emissions reduction, gasoline direct injection engine has been the main direction of the

future of the gasoline engine,so it is very practical to realize the smart start-stop technology

by using the particular structure of the gasoline direct injection engine.The control strategy

of idling stop and the start technology with the combustion in first cycle assisted by the

control theory firstly;The fuzzy controller is designed based on MATLAB,and the control

strategy model for start-stop system is built with SIMULINK to conduct comparative

analysis.The condition of the start technology with the combustion in first cycle assisted by

the starter is different from the common cold start and hot start, the mixture formation is

studied with the simulation software to ensure the successful ignition of the compression

cylinder in the first cycle;The simulation platform of Mitsubishi 4G15 engine is established

by using the software CATIA and FIRE.The numerical simulation is made on the the

formation of the mixture for the first cylinder in the first cycle at the start of the engine.

The research was carried out on the influence of the different fuel injection timing on the

mixture concentration field.The fuel injection timing that can make the better mixture

and the fuel injection quantity is moderate, the mixture formation in cylinder is better,the

equivalence ratio of the mixture near the spark meet the requirements of the ignition

concentration, the successful ignition of the engine can be achieved,and it is conducive to

the stable combustion that the combustible mixture is distributed around the spark

plug;When the fuel injection timing is 20°CA BTDC and the Initial position of the piston is

Abstract

III

30°CA BTDC and the fuel injection quantity is moderate,the distribution region of the

combustible mixture near the spark is relatively small,but the equivalence ratio of the

mixture meet the requirements of the ignition concentration,and the successful ignition of

Cycle; Mixture Formation.

目 录

IV

摘 要 ...................................................................................................................................... I

Abstract .................................................................................................................................. II

第二章 基于模糊控制的怠速停机控制策略研究 ........................................................... 10

第三章 GDI 发动机热机工况首循环第一缸模拟基础 .................................................... 26

目 录

第四章 热机工况首循环第一缸混合气形成情况模拟研究 ........................................... 34

第五章 总结与展望 ........................................................................................................... 56

参考文献 ............................................................................................................................. 58

作者在攻读硕士期间主要研究成果 ................................................................................. 61

致谢 ..................................................................................................................................... 62