Browse Publications Technical Papers 2010-01-0789
2010-04-12

Investigation of EURO-5/6 Level Particle Number Emissions of European Diesel Light Duty Vehicles 2010-01-0789

Particle number emissions are measured with two instruments according to the upcoming European emission regulations for light-duty diesel passenger vehicles and compared to data from other methods, including the current regulatory total particulate matter (PM) mass, photo-acoustic soot sensor (PASS) and engine exhaust particle sizer (EEPS). At the very low emission levels of diesel particulate filter (DPF) equipped vehicles, the solid particle number data correlate well with soot mass and with particle number measured by EEPS, if only those particles belonging to the accumulation mode are considered in the latter case.
PN differences of ≻100% between tests of the same vehicle are observed. Comparison of the two PN instruments and the photoacoustic soot sensor show that these are systematic differences which originate primarily with the vehicle and not from instrument uncertainties. After accounting for this, a repeatability of ≺8% and a reproducibility of ≺27% are estimated for the particle number method.
A large body of new vehicle data is presented from tests carried out immediately after production. The data show that nearly all vehicles would be below the anticipated Euro-5/Euro-6 particle number limit. The observed variability is significant and needs further investigation.

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