甲醇发动机氮氧化物排放测量不确定度试验研究  

Experimental Research on Uncertainty of Nitrogen Oxide Emissions from Methanol Engines

作　　者：李明坤 刘吉绪 王珊 张琳 王凤滨 李腾腾 Li Ming-kun;Liu Ji-xu;Wang Shan;Zhang Lin;Wang Feng-bin;Li Teng-teng(CATARC Automotive Test Center(Tianjin)Co.,Ltd.,Tianjin 300300)

机构地区：[1]中汽研汽车检验中心(天津)有限公司,天津300300

出　　处：《内燃机与配件》2025年第1期12-14,共3页Internal Combustion Engine & Parts

摘　　要：在一台6缸甲醇发动机上系统研究了WHTC循环下尾气中氮氧化物NO x排放测量的不确定度。建立了NO x比排放量数学计算模型,并计算了模型中各影响因素的相对标准不确定度,得到了NO x比排放量测量的不确定度评定结果。试验结果显示,NO x比排放量为166.7992 mg/kW·h,合成标准不确定度为4.6871 mg/kW·h,扩展不确定度为9.3742 mg/kW·h。对比分析各影响因素的相对标准不确定度,其中扭矩测量引入的不确定度影响最大。试验结果将为甲醇发动机提高NO x排放测量的准确性和一致性提供改进方向。This study conducted an experiment based on a methanol engine to evaluate the uncertainty of nitrogen oxide emissions(NO x).The mathematical model of specific emissions of NO x was established.The relative standard uncertainty for each factor was evaluated.The evaluation results of uncertainty were obtained for the specific emissions of NO x.Results show that the specific emissions of NO x was 166.7992 mg/kW·h.The combined standard uncertainty is 4.6871 mg/kW·h.The expanded uncertainty is 9.3742 mg/kW·h.Seen from the relative standard uncertainty of each factor,the greatest contributor is the uncertainty introduced by the torque measurement.The results will provide improvement methods for improving the accuracy and consistency of NO x emissions measurement in methanol engines.

关 键 词：甲醇发动机 WHTC 氮氧化物 不确定度 

分 类 号：U464.11[机械工程—车辆工程]