Analysis of vehicle emission measurements on the new WLTC, the NEDC and the CADC

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Analysis of vehicle emission measurements on the new WLTC, the NEDC and the CADC

Sileghem, Louis / Bosteels, Dirk / May, John / Favre, Cécile / Verhelst, Sebastian

Highlights • Vehicle emissions on the NEDC, CADC and WLTC are analyzed. • The focus is on the second-by-second emission measurements. • The beginning of the test cycle can have an important contribution. • Driving cycles need to exhibit realistic warm-up procedures. • Comparison with real driving (PEMS) data is needed.

Abstract Several studies have shown that the type-approval data is not representative for real-world usage. Consequently, the emissions and fuel consumption of the vehicles are underestimated. Aiming at a more dynamic and worldwide harmonised test cycle, the new Worldwide Light-duty Test Cycle is being developed. To analyse the new cycle, we have studied emission results of a test programme of six vehicles on the test cycles WLTC (Worldwide Light-duty Test Cycle), NEDC (New European Driving Cycle) and CADC (Common Artemis Driving Cycle). This paper presents the results of that analysis using two different approaches. The analysis shows that the new driving cycle needs to exhibit realistic warm-up procedures to demonstrate that aftertreatment systems will operate effectively in real service; the first trip of the test cycle could have an important contribution to the total emissions depending on the length of the trip; and that there are some areas in the acceleration vs. vehicle speed map of the new WLTC that are not completely filled, especially between 70 and 110km/h. For certain vehicles, this has a significant effect on total emissions when comparing this to the CADC.