陈文浩，夏淳，毛克让，陶杰，方俊华，黄震

上海交通大学 机械与动力工程学院， 上海 200240

出版日期:2019-11-28发布日期:2019-12-11
通讯作者:方俊华，男，讲师，电话(Tel.)：021-34206858；E-mail: fjunhua@sjtu.edu.cn.
作者简介:陈文浩（1993-），男，安徽省黄山市人，硕士生，研究方向为汽油机电控及颗粒物排放.
基金资助:国家自然科学基金（51376117），上海汽车工业科技发展基金（1509）资助项目

The Effects of Operating Conditions and Direct Injection Timing on the Particulates Emissions in a Dual-Injection Gasoline Engine

CHEN Wenhao,XIA Chun,MAO Kerang,TAO Jie,FANG Junhua,HUANG Zhen

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 2002400, China

Online:2019-11-28Published:2019-12-11

摘要/Abstract

摘要： 应用DMS500快速颗粒分析仪对一台进气道-缸内双喷射汽油机的颗粒物排放特性进行试验研究，考察运行工况(转速、负荷)以及直喷时刻对颗粒物排放量及其粒径分布的影响.研究结果表明：在低负荷下双喷与直喷模式的燃烧特性区别较小，而在中、高负荷下双喷模式的缸压峰值相比于直喷模式的缸压峰值略有升高；双喷模式具有非常显著的降低颗粒物排放的效果，但随着转速、负荷的升高双喷模式的颗粒物排放量也逐渐上升；在中、高负荷下，直喷比例为50%的双喷模式对降低颗粒物排放量的效果显著；与直喷模式相比，双喷模式的颗粒物粒径分布向小粒径方向移动；直喷模式存在最佳的喷射正时使得颗粒物排放量达到最低水平，双喷模式的最佳直喷正时要比直喷模式更靠近排气上止点.
关键词: 缸内直喷, 双喷射汽油机, 颗粒物排放, 粒径分布, 直喷正时
Abstract: A DMS500 fast particulate spectrometer was employed to explore the particle emissions characteristics of a dual-injection gasoline engine. The main goal is to investigate the effects of operating conditions (speed and load ) and direct injection timings on the particle size distributions and particulate emissions in steady state conditions. The experimental results indicate that the combustion characteristics of dual-injection are similar to that of the direct-injection mode at low loads. While at middle and high loads, the peak of in-cylinder pressure curve of dual-injection is a little higher than that of the direct-injection mode. Dual-injection yields great particulate emissions reduction. As the speed and load rise, the particulate emissions of dual-injection gradually increase. At middle and high loads, the particulate emission improvement of dual-injection with 50% fuel directly injected declines significantly. Compared to the direct-injection mode, the particle size distributions of dual-injection tend to shift towards the smaller size region. There exists the best injection timing for the direct-injection mode to yield the lowest particulate emissions. For the dual-injection mode, the best direct injection timing is much closer to the exhaust top dead center than that of the direct-injection mode.
Key words: direct-injection, dual-injection gasoline engine, particulate emissions, particle size distribution, direct-injection timing


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