[Back]

H. Puxbaum, J. Girard, E. Pucher:
"Correction Factors for Vehicle Emissions Rates Based on the Tauern Tunnel Experimental Data to Improve Vehicle Category Emissions Estimates";
Poster: 12th symposium "Transport and Air Pollution", Avignon, FR; 2003-06-16 - 2003-06-18; in: "Proceedings of the 12th symposium "Transport and Air Pollution", Avignon, 16-18 June 2003", (2003), ISBN: 2-85782-588-9; 159 - 164.

Previous data has been acquired from tunnel experiments where concentrations of more than 100 exhaust gas constituents were measured and the vehicle categories were recorded. The vehicle fleet is broken up into categories of: passenger car with/without trailer, light duty trucks, heavy duty trucks with/without trailer, semi trailer trucks, buses and motorcycles. Three models, based on linear regression were used to characterize the sources. They used the number of vehicles, the CO2-emissions per vehicle category (LDV and HDV) and the CO2-emissions per fuel type (gasoline and diesel) as input values. The determination method was based on the measurement of the concentrations of the components and the air-flow of the tunnel full cross ventilation. Therefore it is possible to use the difference of input air concentrations to output air concentrations to calculate the mass of exhaust emissions. Modelling work has also been done to estimate the levels of emissions given the composition of the vehicle fleet. Based on data sets of the "Handbook Emission Factors" CO and HC emissions were overestimated. Nitrogen oxide emissions were underestimated. The differences in CO and HC seem to be due to older altitude correction factors. The lower level of the calculated NOx-emissions can be explained by higher real life emissions from heavy duty vehicles. This paper uses the experimental data from the tunnel experiments to calculate correction factors for emissions of various vehicle categories. The experimental data is ideal for this work because the measurements take place in a controlled environment where the operating conditions of the vehicle fleet are fairly simple - for example the vehicles have a relatively steady speed. This means good correlation to the heavy duty vehicle certification test procedure, etc. For this paper correction factors are found for NOx, CO and hydrocarbons, as well as new emissions rates for some non-regulated exhaust constituents.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404849