基于WLTC测试循环的颗粒数量排放特性及其与发动机工况的关联性研究  

Study on Particle Emission Characteristics Based on WLTC Test Cycle and the Correlation with Engine Operating Conditions

作　　者：王树青[1] 程传辉[1] 周舟[1] 徐政[1] 王绍明[1] 苗学刚[1] WANG Shuqing;CHENG Chuanhui;ZHOU Zhou

机构地区：[1]上海汽车集团股份有限公司技术中心

出　　处：《上海汽车》2019年第10期18-24,共7页Shanghai Auto

摘　　要：对WLTC测试循环整车的颗粒物数量排放分析结果表明低速段排放占比高,尤其在前50 s的起动阶段,瞬态排放达到WLTC循环的最大峰值;在50~1 800 s阶段,颗粒物数量排放随工况变化趋于稳定。基于颗粒物数量排放分布特性,提出了基于台架开环实时控制系统的WLTC循环前50 s瞬态工况模拟以及基于聚类分析得到11个工况点对WLTC 50~1 800 s台架稳态模拟的测试方法。结果表明:台架模拟前50 s试验工况及控制参数与整车一致性较好,颗粒物数量排放与整车结果偏差为4.2%,基于聚类分析50~1 800 s得到11个工况点的颗粒物数量排放结果相对整车试验偏差为8.7%。与整车实测结果一致,满足工程开发评估要求。The results of the particulate amount discharged from the WLTC test cycle show that the low-speed segment has a high proportion of emissions,especially in the first 50 s of the transient phase,which reaches the maximum peak of the WLTC cycle.The amount of particulate from 50~1 800 s tends to be stable as the operating conditions change.Based on the distribution characteristics of particulate emission,a 50 s transient condition simulation based on the open-loop real-time control system of the truss and a simulation of the WLTC 50~1 800 s gantry steady-state simulation based on cluster analysis are proposed.The results show that the test conditions and control parameters of the 50 s before the bench simulation are in good agreement with the whole vehicle.The deviation of the particulate matter emission from the vehicle results is 4.2%.Based on the cluster analysis,the results of the 11-weighted particulate emission from 50~1 800 s are 8.7%relative to the vehicle test.Consistent with the measured results of the whole vehicle,it can meet the engineering development evaluation requirements.

关 键 词：测试循环 颗粒数量排放 台架模拟 聚类分析 排放关联预测 

分 类 号：U46[机械工程—车辆工程]