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柴油发动机NH3比排放测量的不确定度评定

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针对重型柴油发动机在WHSC循环试验中的NH3 污染物比排放,建立了其数学计算模型,并通过理论方法对模型中各种参数的相对标准不确定度进行了分析,最终得到了NH3 比排放的不确定度评定结果,其合成相对标准不确定度为 9.02%.对各分量的相对不确定度进行比较发现,NH3比排放测量结果重复性引入的不确定度影响最大.因此,在试验时要确保发动机以及后处理系统状况良好、工作稳定,同时加强排放分析系统的标定和维护.试验操作人员应熟练掌握设备的操作以及原理,从而降低测量重复性引入的不确定度.
Evaluation of Uncertainty in Measurement of NH 3 Specific Emissions from Diesel Engines
A mathematical calculation model was established for the NH3 pollutant specific emissions of heavy-duty diesel engines in the WHSC cycle test,and the relative standard uncertainty of various param-eters in the model was analyzed through theoretical methods.Finally,the uncertainty evaluation results of NH3 specific emissions were obtained.The relative standard uncertainty of its synthesis is 9.02%.Compar-ing the relative uncertainty of each component,it is found that NH3 has the greatest impact on the uncer-tainty introduced by the repeatability of emission measurement results.Therefore,during the test,it is nec-essary to ensure that the engine and aftertreatment system are in good condition and stable operation,and to strengthen the calibration and maintenance of the emission analysis system.Test operators should be proficient in the operation and principles of the equipment,thereby reducing the uncertainty introduced by measurement repeatability.

UncertaintyNH3EmissionEngine

韩松、张琳、闫鹏勇、吴春玲、王振宇

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中汽研汽车检验中心(天津)有限公司 天津 300300

不确定度 排放 发动机

2024

小型内燃机与车辆技术
天津大学

小型内燃机与车辆技术

CSTPCD
影响因子:0.261
ISSN:1671-0630
年,卷(期):2024.53(2)
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