Laufleistungsabhängige Veränderungen der CO2-Emissionen von neuen PKW. [Mileage-depending changes in CO2 emissions of new passenger vehicles.] Bericht zum Forschungsprojekt FE 84.0509/2012 der Bundesanstalt für Strassenwesen BAS

Author(s)
Pellmann, E. & Schmidt, S.
Year
Abstract

The measurement of fuel consumption and CO2 emissions is an important part within the scope of the European type approval procedure for passenger vehicles. The requirements are presented in Regulation (EC) 715/2007 in connection with Regulation (EC) 692/2008, and any versions developed based on them. This work should deliver important aspects with respect to the verification of the determined CO2 emissions relative to CoP (Conformity of Production). The brand-new engine must usually be driven in, until fuel consumption adjusts to a stable, approx. constant value. Upon request by the manufacturer, the tests can be performed on vehicles that have driven a maximum run-in distance of 15,000 km. s alternative, the vehicle manufacturer may assume a fixed factor as development coefficient (DC) instead of driving the drive-in distance. According to ECE Regulation No. 101, this factor amounts to 0.92. This means that the CO2 values measured at "0 km" can be reduced by 8 %. The task of this research project is to improve the data basis with measurements on an exhaust roller dynamometer test bench. Based on these, it can be derived in a next step, whether the development coefficient of 8 % can be still applied for current vehicles or whether a different value must be derived. This is an issue within the scope of the revision of measurement procedure and boundary conditions (WLTP) in the course of the WLTP transposition into EU-legislation. In this work, 25 vehicles were measured at "0 km" and "15,000 km" on an exhaust roller dynamometer test bench with respect to CO2 emissions and fuel consumption. To achieve sufficient representative nature, a sufficiently large number of vehicles from different segments and with different drive concepts (gasoline, diesel, manual transmission, automatic transmission, all-wheel drive, etc.) of emission standards Euro 5 and Euro 6 has been tested. It turned out that the investigated vehicles improved significantly with respect to the CO2 emissions measured at the two points. The mean value of the deviations of all data sets determined in percentages amounted to -3.3 %. The range of the measurement results was +1.8 % to -7.3 %. It was also determined that the run-in process of the vehicles has a continuous characteristic. It is most pronounced during the first kilometres. This means that for the purpose of CoP a suitable procedure, which considers run-in effects, must still exist in the future. As the producing of individual development coefficients for all vehicles requires great effort, an appropriate alternative in form of a fixed development coefficient should be provided further on. The data delivered within the scope of the project provide important and valuable findings in knowledge. This is even more important, as at present no other investigations have been carried out regarding this topic. The results of this study can be implemented directly into the development of the new WLTP Regulation. (Author/publisher)

Publication

Library number
20180016 ST [electronic version only]
Source

Bergisch Gladbach, Bundesanstalt für Strassenwesen BASt, 2017, 21 p.; Berichte der Bundesanstalt für Strassenwesen : Fahrzeugtechnik ; Heft F 121 - ISSN 0943-9307 / ISBN 978-3-95606-359-6

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