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Highlights the effects of disparities between real-world data and official road-load coefficients, used to set up vehicle type-approval test equipment, on fuel consumption and CO2 ratings for European passenger cars.
Analyzes and compares new-vehicle type-approval procedures in the EU and U.S. with an eye toward demonstrating how best to align regulatory requirements, customer expectations, and environmental performance.
Identifies and quantifies impacts on type-approval values of the EU's anticipated transition from the NEDC to the WLTP. Notably, the effects of the new driving cycle and the new definition of vehicle test masses result in a target of 100 g CO2/km for 2020.
On November 14, the formal text for the WLTP was adopted. If confirmed by the World Forum for Harmonization of Vehicles Regulations, the WLTP will be ready for implementation by individual countries.
This paper compares fuel consumption / CO2 values of passenger cars from different sources and aims at quantifying the discrepancy between laboratory type-approval values and real-world values, including a retrospective analysis for the years 2001-2011 to determine if the gap between the two datasets has increased over time. Potential explanations for the discrepancies found are discussed and possible practical solutions for the future outlined.
This paper is ICCT’s 4th contribution to the UNECE GRPE informal subgroup on the development of a worldwide harmonized light vehicles test procedure (WLTP-DTP).