Miller循环汽油机稀薄燃烧及排放特性分析

doi:10.3969/j.issn.1674-8484.2021.03.016

汽车安全与节能学报 ›› 2021, Vol. 12 ›› Issue (3): 402-409.DOI: 10.3969/j.issn.1674-8484.2021.03.016

Miller循环汽油机稀薄燃烧及排放特性分析

尹爱勇¹(), 黄昭明²^,^*(), 王利², 沈凯³, 陈伟国⁴

1.铜陵职业技术学院机械工程系,铜陵 244000,中国
2.皖江工学院机械工程学院,马鞍山 243031,中国
3.上海理工大学机械工程学院,上海 200093,中国
4.奇瑞汽车股份有限公司汽车工程技术研发总院,芜湖 241006,中国

收稿日期:2021-06-05 出版日期:2021-09-30 发布日期:2021-10-09
通讯作者: 黄昭明
作者简介:* 黄昭明（1981—）,男（汉族）,江苏,副教授。E-mail: jimmymacy@163.com。
尹爱勇（1978—）,男（汉族）,安徽,副教授。E-mail: yinaiyong168@qq.com。
基金资助:
国家自然科学基金资助项目(51806143);安徽省高等学校自然科学研究重点项目(KJ2020A0837);安徽省高等学校自然科学研究重点项目(KJ2020A0972)

Analysis of lean combustion and emission characteristics of Miller cycle gasoline engine

YIN Aiyong¹(), HUANG Zhaoming²^,^*(), WANG Li², SHEN Kai³, CHEN Weiguo⁴

1. Department of Mechanical Engineering, Tongling Polytechnic, Tongling 244000, China
2. School of Mechanical Engineering, Wanjiang University of Technology, Maanshan 2430314, China
3. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 201804, China
4. Automotive Engineering & Technology Research Institute, Chery Automotive Co., Ltd., Wuhu 241006, China

Received:2021-06-05 Online:2021-09-30 Published:2021-10-09
Contact: HUANG Zhaoming

摘要/Abstract

摘要：

针对稀燃过程对增压Miller循环直喷汽油机燃烧及排放的影响进行了试验研究,分析了稀燃协同废气再循环（EGR）对汽油机油耗率的影响规律,结合透明发动机对缸内稀燃过程进行了可视化分析。结果表明:当过量空气系数（λ）为1.55时,油耗率降低约7%,继续增大λ油耗率反升;稀燃导致强Miller效应, 空燃比扩展能力受限,对油耗率的改善程度减小;在λ升高初期,滞燃期每延长曲柄转角（CA）1°,10%~90%燃烧持续期对应延长CA 1°。增大EGR率及提高λ均能有效降低燃油消耗率,且当量燃烧模式下EGR率为14%,相当于稀燃模式下λ = 1.35对油耗率的贡献程度;使λ达到1.27时,在相同EGR率14%条件下,稀燃模式比当量燃烧模式油耗率降低可达7.5%。

关键词: 汽油机, 稀薄燃烧, Miller循环, 废气再循环 (EGR), 可视化分析

Abstract:

The influence factors of lean burn process on combustion and emission of supercharged Miller cycle direct injection gasoline engine was experimentally investigated, in which the influence law of lean burn combined with exhaust gas recirculation (EGR) on fuel consumption rate of gasoline engine was analyzed, and the cylinder lean burn process was visually analyzed with a transparent engine. The results show that the fuel consumption rate decreases by about 7% when the excess air coefficient (λ) is 1.55 and the fuel consumption rate increases inversely with increasing λ; Lean burn leads to strong Miller effect and the expansion ability of air-fuel ratio is limited, resulting to the improvement of fuel consumption rate is reduced; At the initial stage of λ rising, the combustion delay period extending by crank angle (CA) 1° is corresponding to the combustion duration of 10% - 90% extending CA 1°. Increasing EGR rate and improving λ can effectively reduce the fuel consumption rate, and the EGR rate in equivalent combustion mode is 14%, which is equivalent to the contribution to fuel consumption rate in lean combustion mode when λ is 1.35. When λ reaches 1.27, the fuel consumption rate in lean burn mode can be reduced by 7.5% than that in equivalent combustion mode under the condition of 14% EGR rate.

Key words: gasoline engine, lean burned, Miller-cycle, exhaust gas recirculation (EGR), combustion visualization

中图分类号:

TK421.5

尹爱勇, 黄昭明, 王利, 沈凯, 陈伟国. Miller循环汽油机稀薄燃烧及排放特性分析[J]. 汽车安全与节能学报, 2021, 12(3): 402-409.

YIN Aiyong, HUANG Zhaoming, WANG Li, SHEN Kai, CHEN Weiguo. Analysis of lean combustion and emission characteristics of Miller cycle gasoline engine[J]. Journal of Automotive Safety and Energy, 2021, 12(3): 402-409.

图/表 12

图1 发动机试验台架及测试系统

参数	四缸机	透明单缸机
型式	4缸、4冲程	单缸、4冲程
进气压力控制	涡轮增压系统	温控模拟增压系统
配气机构	D-VVT	相位可调式系统
喷油器布置	中置直喷	中置直喷
燃油供给系统	35 MPa供油系统	35 MPa供油系统

表1 四缸发动机和单缸透明发动机主要参数

图2 单缸机试验台架示意图

图3 不同凸轮轴方案配气相位示意图

图4 不同Miller效应下燃烧过程示功图

图5 进气Miller效应对汽油机稀燃油耗率的影响

图6 稀薄燃烧模式下燃烧特征参数对比

图7 稀薄燃烧模式下气态污染物排放对比

图8 EGR与稀薄燃烧对油耗率的影响

图9 EGR协同稀薄燃烧对燃烧相位的影响对比

图10 稀燃模式下透明发动机缸内平均压力及缸压峰值统计对比

图11 不同λ条件下透明发动机缸内燃烧过程对比

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Miller循环汽油机稀薄燃烧及排放特性分析

Analysis of lean combustion and emission characteristics of Miller cycle gasoline engine

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