轻型汽车CO_(2)排放测量不确定度评定

Evaluation of Uncertainty of CO_(2) Emission Measurement of Light Vehicles

CO_(2)排放是汽车污染物排放检测的一项重要技术指标,它表征的是汽车排出污染物的多少和车辆能耗高低的参考标准之一,用以控制汽车使用中产生的污染物排放量,避免对环境产生损害。按照GB 18352.6-2016《轻型汽车污染物排放限值及测量方法(中国第六阶段)》的规定使用全球统一的轻型车测试循环工况进行常温下冷启动后污染物排放试验,并对测量结果进行不确定度评定。文章阐述了轻型汽油车CO_(2)排放测试所用的测试原理、法规工况曲线、测试设备、数学模型等,通过分析影响试验结果的各因素来源,综合计算得出轻型车CO_(2)排放测试结果的扩展不确定度和相对扩展不确定度。

The CO_(2)emission is an important technical index of vehicle pollutant emission detection,It represents one of the reference standards for the amount of pollutants emitted by vehicles and the level of vehicle energy consumption,To control the emission of pollutants produced in the use of automobiles and avoid damage to the environment.According to GB 18352.6-2016"Limits and measurement methods for emissions from light-duty vehicles(CHINA 6)",the world's uniform light vehicle test cycle(WLTC)is used to conduct the pollutant emission test after cold start at room temperature,And evaluate the uncertainty of the measurement results.This paper describes the test principle,regulation working condition curve,test equipment and mathematical model used in the CO_(2)emission test of light-duty gasoline vehicles.By analyzing the sources of various factors affecting the test results,the expanded uncertainty and relative expanded uncertainty of the CO_(2)emission test results of light-duty vehicles are calculated comprehensively.