Methods for calculating the humidity correction factor and their impact on nitrogen oxide emissions

The article presents the results of emission tests for passenger cars with SI and CI engines, as well as heavy-duty vehicles under road conditions. The tests were conducted over a distance of several kilometers while driving on sections with varying characteristics. A mobile exhaust gas analyzer, SEMTECH-DS by SENSORS, was used to measure nitrogen oxide concentrations. Four runs were performed for each vehicle, and the nitrogen oxide emission values were then averaged. For each value, the humidity correction factor was calculated according to the following methods: 1065.670, 86.1342-94 SI, 86.1342-94 Diesel, and 86.1370-2007 NTE. The obtained data were used to develop relationships characterizing the influence of the humidity correction factor calculation method on nitrogen oxide emissions.INFLUENCE OF THE CALCULATION METHOD OF THE HUMIDITY CORRECTION FACTOR ON THE NITROGEN OXIDES EMISSIONS
The article presents the results of exhaust emission tests of passenger car with SI engine, passenger car with CI engine and heavy duty vehicle in road conditions.
The tests were carried out in sections of about a dozen kilometers in length in city traffic conditions. The SEMTECH-DS mobile analyzer from SENSORS was used to measure the concentration of exhaust emissions. For every vehicle made four rides, and then averaged the value of nitrogen oxides emissions. For each value was calculated the humidity correction factor by methods: 1065.670, 86.1342-94 SI, 86.1342-94 Diesel and 86.1370-2007 NTE. The data obtained were used for the analysis of relationships characteristic of the influence of the calculation method of the humidity correction factor on the NOx emissions. (…)