Analysis of Pollutant Emissions and Fuel Consumption in Chassis Dynamometer Testing of a Passenger Car Under United Nations Climate and Sustainability Frameworks

This publication presents the results of studies on exhaust emissions and fuel consumption from spark-ignition engines in the NEDC test, which applies to the vast majority of passenger cars in use in the European Union. This emissions testing procedure was selected based on an analysis of the number of existing engines meeting specific emission standards. A statistical analysis of the studied processes was conducted. Additionally, the product of speed and acceleration modulus was examined as quantities characterizing the dynamic characteristics of the vehicle speed process during testing. Correlation studies of vehicle speed and exhaust emission rates, particle number rates, and mass fuel consumption rates were presented. Average distance-specific emissions, average distance-specific particulate number, and average distance-specific fuel consumption were determined in the NEDC test. The probability density distributions of the investigated processes in the NEDC test were analyzed. Based on an assessment of the conformity of the studied sets with the normal distribution using the Kolmogorov–Smirnov, Lilliefors, and Shapiro–Wilk hypotheses, it was concluded that there was no basis for accepting the hypotheses that the sets conform to the normal distribution. Moreover, the power spectral density of the investigated processes was evaluated. Significant variation in spectral characteristics, especially at high frequencies, was identified, revealing substantial dynamic differences between the processes. The average road emission values in the NEDC test were significantly lower than even the limits for Euro 7.