摘要
通过对一款涡轮增压GDI发动机凸轮型线和活塞形状的设计,研究了不同压缩比米勒循环发动机对增压GDI发动机的燃烧、缸压、排放和油耗等方面的影响。结果表明,对于米勒循环的GDI增压发动机,在外特性会损失一部分最高功率,但是能在一定程度上降低油耗;在部分负荷,米勒发动机减少了泵气平均有效压力,从而对降低燃油消耗率的作用比较明显,同时由于米勒效应导致燃烧温度降低,使得NOx排放得到显著改善,但是在低负荷时THC排放会有所上升。
A new cam profile and two new pistons for a turbocharged GDI engine were designed, and the effects of Miller-cycle with different compression ratios on combustion characteristics, in-cylinder pressure, emission and fuel consumption, etc were investigated. The results shows, for turbocharged GDI engine utilizing Miller cycle, partial maximum power is lost at full load, however, fuel consumption can be reduced. At partial loads, since Miller cycle effect reduces PMEP, thus has obvious effect in reducing fuel consumption rate. Meanwhile, the suppression of combustion temperature also lowered emission of NOx, whereas, THC would increase at low loads.
作者
安宗权
黄昭明
潘金元
陈伟国
An Zongquan;Huang Zhaoming;Pan Jlnyuan;Chen Weiguo(Jiangsu University, Zhenjiang, 212013;Wuhu Institute of Technology, Wuhu, 241000;Hohai University Wentian College, Maanshan, 243031;Chery Automobile Co., Ltd, Wuhu 241006)
出处
《汽车技术》
CSCD
北大核心
2018年第5期25-29,共5页
Automobile Technology
基金
国家自然科学基金项目(51575245)
安徽省教育厅自然科学研究重点项目(KJ2016A753
KJ2017A896)
芜湖市科技计划项目(2016cxy03)
关键词
GDI增压发动机
不同压缩比
米勒循环
排放
Turbocharged GDI engine
Different compression ratio
Miller cycle
Combustion
Emission
