关于功率阈值对PEMS试验结果影响的研究

The Study on The Influence of Power Threshold on PEMS Results

针对便携式排放测试系统(portable emission measurement system, PEMS)中采用功基窗口法及移动平均窗口法进行PEMS试验排放的判定,在其有效窗口的判定中,我们对窗口的功率阈值有一个动态的判定。本文针对不同窗口功率阈值对PEMS试验总体计算结果以及窗口维度的影响进行分析,便于我们更加清晰了解PEMS试验的难点,通过对一组非城市及两组城市类型PEMS数据的分析,我们可以清晰掌握不同类型的PEMS试验数据,有效窗口功率阈值对其的不同影响,这对发动机排放开发及排放预测模型的构建等有着深远意义。

Aimed at the portable emission measurement system(PEMS), the power based window method and moving average window method are used to calculation the PEMS test emission. In the determination of its effective window, we have a dynamic determination of the power threshold of the window. This paper analyzes the impact of different window power thresholds on the overall calculation results and window dimensions of PEMS test, so that we can more clearly understand the difficulties of PEMS test. Through the analysis of a group of not-city and two groups of city type PEMS data, we can clearly grasp the different effects of different types of PEMS test data and effective window power thresholds, This has far-reaching significance for the development of engine emission and the construction of emission prediction model.