基于CFR辛烷值测量系统的不确定度评定

Uncertainty Evaluation for CFR Octane Number Testing System of Gasoline

为了测量汽油样品的辛烷值,建立了一套CFR辛烷值测量系统,分析了该系统中影响辛烷值测量的各不确定度分量因素,主要包括辛烷值自动配样机、辛烷值的重复性试验、辛烷值机自身等。计算了这些分量因素的不确定度。经过不确定度的合成,表明在置信水平95%时,构建的CFR辛烷值台架试验测量系统,其研究法辛烷值的扩展不确定度为0.7,满足了汽油燃料的测量不确定度要求。

Octane number testing system is set up in order to get the octane number of gasoline. The components of uncertainty influencing on the measurement of octane number, including automatic manufacture standard sample machine, repeated test of octane number and CFR engine, are analyzed in the system. The uncertainty are calculated. Synthesizing the uncertainty results of all the components show that octane number testing system for the expanded uncertainty of research octane numeber is 0. 7 at 95% confidence level, which meet the demand for measurement uncertainty of gasoline fuel.