基于WHTC循环的柴油机颗粒物数量峰值的研究  

A Study on Particulate Number Peaks in a Diesel Engine Based on WHTC Cycle

作　　者：熊兴旺[1] 高俊华[1] 周涛 于津涛[1] 

机构地区：[1]中国汽车技术研究中心,北京100176 [2]潍柴动力股份有限公司,潍坊261001

出　　处：《汽车工程》2017年第4期381-385,共5页Automotive Engineering

摘　　要：在一台京五柴油机上,燃用国五柴油,进行了原机的瞬态加速、减速试验和WHTC冷热态试验。为便于分析,引入"流量积"概念(进气量和燃油流量之积)作为一个变量。在瞬态加速和减速试验中,颗粒物数量与流量积变化趋势一致,颗粒物数量的变化时刻滞后于流量积的变化时刻。WHTC循环试验中颗粒物数量峰值和相应的流量积峰值呈正相关关系,颗粒物数量峰值出现的时刻与相应的流量积峰值出现的时刻间存在滞后时间,该滞后时间与流量积峰值大小呈负相关关系。Transient acceleration and deceleration tests together with cold-and hot-started WHTC tests are conducted on a Beijing-Ⅴdiesel engine fueled with State-Ⅴdiesel fuel. For facilitating analysis,a concept of ’flow product’ is introduced（ defined as the product of air mass flow and fuel mass flow） as a variable. In transient acceleration and deceleration tests,particulate number shows the same variation trend as flow product does,but the changes of particulate number lag behind that of flow product. In WHTC tests there exists a positive correlation between particulate number peaks and corresponding flow product peaks,but there show time lags between the moments particulate number peaks and corresponding flow product peaks appear,while time legs exhibit a negative correlation with the amplitude of flow product peaks.

关 键 词：柴油机 颗粒物数量排放 瞬态工况 进气量 燃油流量 

分 类 号：U464.172[机械工程—车辆工程]