Investigations on Total Error in Emission Measurements Under Real Driving Conditions
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The directives applicable since September 1, 2017, on emission measurement of a motor vehicle under real driving conditions require a higher level of measurement and calculation expense in measuring systems. The influence of ambient conditions on the measuring devices during an RDE measurement was analyzed in the course of an evaluation at the Institute of Internal Combustion Engines of the Karlsruhe Institute of Technology.
The measuring techniques employed to determine emissions under real driving conditions, RDE (Real Driving Emissions) for short, can be subdivided into two areas: On the one hand, extensive exhaust gas measurement systems (CVS) are used to determine the reference emission level for a vehicle by means of a driving cycle (WLTC) on a roller-type dynamometer. This reference value, in turn, is employed in the calculation of total emissions under real driving conditions. On the other hand, measurement of the emissions of a motor vehicle in road traffic requires...
The influence of ambient conditions on PEMS measuring units during RDE measurements was analyzed in close cooperation with the German Association of the Automotive Industry (VDA). The authors would like to express their gratitude to VDA for the support they received in the form of data collected from background experience and the provision of measuring instruments and test setups.