点燃式机动车排放烟气过量空气系数测量结果不确定度的评定

Evaluation of Measurement Result Uncertainty for Excess Air Coefficient of Exhaust from Vehicles Equipped Ignition Engine

基于烟气分析仪对机动车排气污染物体积分数的测量,介绍了点燃式机动车排放烟气过量空气系数计算模型,重点分析了测试过程各个不确定度的来源,推导出各不确定度来源的灵敏系数公式,提出一种排放烟气过量空气系数测量结果不确定度评定方法。

Based on measurement of volume fraction exhaust pollutants from vehicles, this paper introduces calculation of Excess Air Coefficient of Exhaust from Vehicles Equipped Ignition Engine, and analyzes uncertainty source introduced by test equipment metrological characteristics. The formulae of uncertainty source sensitivity coefficient are developed in detail, a method of evaluating measurement result uncertainty for exhaust excess air coefficient is put forward.