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A Model Based Definition of a Reference CO 2 Emissions Value for Passenger Cars under Real World Conditions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published May 30, 2018 by SAE International in United States
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With the adoption of the Worldwide harmonized Light Vehicles Test Procedure (WLTP) and the Real Driving Emissions (RDE) regulations for testing and monitoring the vehicle pollutant emissions, as well as CO2 and fuel consumption, the gap between real world and type approval performances is expected to decrease to a large extent. With respect to CO2, however, WLTP is not expected to fully eliminate the reported 40% discrepancy between real world and type approval values. This is mainly attributed to the fact that laboratory tests take place under average controlled conditions that do not fully replicate the environmental and traffic conditions experienced over daily driving across Europe. In addition, any uncertainties of a pre-defined test protocol and the vehicle operation can be optimized to lower the CO2 emissions of the type approval test.
Such issues can be minimized in principle with the adoption of a real-world test for fuel consumption. However, repeatability and an accuracy of a few gCO2/km is difficult to achieve due to the actual drag, the road surface effect on driving resistance, the road slope, the battery and auxiliaries use etc., which come naturally with on-road tests. Since a reference value for CO2 emissions should not depend on the testing circumstances, modeling can be deployed in order to introduce the necessary correction of measurement variations in a harmonized manner, based on individual vehicle simulation models that can produce smoothed results under the same driving conditions, ambient temperature, alternator operation etc. In this paper, such a simulation approach for the correction of RDE compliant measurements is introduced and demonstrated with a few real cases. The approach incorporates the encountered real-world effects for the prediction of a reference CO2 value. It is shown that with an expansion of the approach to cover variations for existing engine types, powertrains, vehicle types etc., baseline accuracy for real world simulations can be established.
- Zissis Samaras - Aristotle University of Thessaloniki
- Dimitris Tsokolis - Aristotle University of Thessaloniki
- Athanasios Dimaratos - Aristotle University of Thessaloniki
- Leonidas Ntziachristos - Aristotle University of Thessaloniki
- Stylianos Doulgeris - Aristotle University of Thessaloniki
- Norbert Ligterink - TNO Automotive
- Willar Vonk - TNO Automotive
- Rob Cuelenaere - TNO Automotive
CitationSamaras, Z., Tsokolis, D., Dimaratos, A., Ntziachristos, L. et al., "A Model Based Definition of a Reference CO2 Emissions Value for Passenger Cars under Real World Conditions," SAE Technical Paper 2018-37-0031, 2018, https://doi.org/10.4271/2018-37-0031.
Data Sets - Support Documents
|Unnamed Dataset 1|
- TNO Official Website https://www.tno.nl/en/ 2018
- LAT Official Website http://lat.eng.auth.gr/ 2018
- Ligterink , N. , Smokers , R. , Spreen , J. , Mock , P. et al. 2016
- Buckley , F. ABCD - an Improved Coast Down Test and Analysis Method SAE Technical Paper 950626 1995 10.4271/950626
- Pachernegg , S. A Closer Look at the Willans-Line SAE Technical Paper 690182 1969 10.4271/690182
- AVL AVL Cruise - Vehicle System and Driveline Analysis https://www.avl.com/cruise 2018
- Tsokolis , D. , Tsiakmakis , S. , Triantafyllopoulos , G. , Kontses , A. et al. Development of a Template Model and Simulation Approach for Quantifying the Effect of WLTP Introduction on Light Duty Vehicle CO2 Emissions and Fuel Consumption SAE Technical Paper 2015-24-2391 2015 10.4271/2015-24-2391
- Tsokolis , D. , Tsiakmakis , S. , Dimaratos , A. , Fontaras , G. et al. Fuel Consumption and CO2 Emissions of Passenger Cars over the New Worldwide Harmonized Test Protocol Applied Energy 179 1 1152 1165 2016 10.1016/j.apenergy.2016.07.091
- Heijne , V. , Kadijk , G. , Ligterink , N. , van der Mark , P. et al. 2016
- Ligterink , N.E. et al. 2015
- Ligterink , N.E. et al. 2016
- Sentoff , K.M. , Hall , L.A. , and Holmén , B.A. Implications of Driving Style and Road Grade for Accurate Vehicle Activity Data and Emissions Estimates Transportation Research, Part D: Transport and Environment 35 175 188