Credibility Evaluation of Pems Measurements in Rde Tests: Nox Measurement Uncertainty

作     者：Su, Sheng Hou, Pan Lyu, Liqun Wang, Xin Lyu, Tao Lai, Yitu Luo, Wanyou Ge, Yunshan Wang, Yachao Wang, Qihu 

作者机构：College of Marine Equipment and Mechanical Engineering Jimei University Xiamen361021 China Xiamen Environment Protection Vehicle Emission Control Technology Center Xiamen361023 China National Laboratory of Automotive Performance & Emission Test School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Sciences Beijing100012 China Qinghai Plateau Technology Development Co. Ltd. Xining810000 China 

出 版 物：《SSRN》 

年 卷 期：2022年

核心收录：

主　　题：Uncertainty analysis 

摘      要：First systematic evaluation on the NOx measurement uncertainty of Portable Emission Measurement System (PEMS) has been completed in China. Zero and span drift, parameters directly related to the measurement accuracy, were re-evaluated, and the results showed that the zero and step drifts were not linear or stepped, which were independent of to the boundary conditions or measurement principle. The range of zero drift was ± 3.0ppm, meanwhile, more than 95% span drifts were within a range of 1.5%. Then the largest additional NOx emissions due to the step zero drift of 3ppm was 9.4mg/km with the worst case being 6.6mg/km by span drift under Worldwide Light-Duty Vehicle Test Cycle(WLTC). Bring these parameters into the evaluation framework, the NOx measurement uncertainty corresponding to China-6a and China-6b were 37.1% and 56.3% respectively, which are larger than previous EU evaluation results, mainly due to the more stringent NOx limit. © 2022, The Authors. All rights reserved.