Current type-approval exhaust emission measurement procedures do not fully reflect emissions measured during road tests. A solution to this problem may be tests performed exclusively under real driving conditions, using mobile PEMS (Portable Emissions Measurement Systems) exhaust gas analyzers. However, emission measurements under such conditions are characterized by high variability. Therefore, the PCA (Principal Component Analysis) method was used to assess the variability of CO, CO2, HC, and NOx concentrations. Such an analysis was performed for a 4-dimensional space using: vehicle speed and acceleration, as well as engine speed and torque.The harmfulness of internal combustion engines to the natural environment is assessed primarily based on the evaluation of values characterizing pollutant emissions in relation to the limits of these values established by normative acts. (…)
The article contains 20001 characters.
Source: Logistyka Magazine
Study of pollutant emission variability using the PCA method – PDF file for download