Effect of Diesel Properties on Emissions and Fuel Consumption from Euro 4, 5 and 6 European Passenger Cars

Williams, Rod; Hamje, Heather; Rickeard, David J.; Bartsch, Thomas M.; Fittavolini, Corrado; Heijning, Paul Van de; Lehto, Kalle; Gunter, Garry C.; Cortijo, Javier Aríztegui; Zemroch, P. J.; Samaras, Zissis

doi:10.4271/2016-01-2246

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…The WLTC has a higher mean velocity than the NEDC or FTP, double the test distance and a quarter of the number of starts from idle. All this leads to lower emissions than the NEDC [21], as shown by Williams et al [22] for Euro 6 vehicles.…”

Section: Introductionmentioning

confidence: 84%

“…The WLTC, which is supposed to be more real world than the NEDC, has fewer stop/starts and a higher average speed and hence is not representative at all of congested traffic driving. As a consequence data from WLTC tests and NEDC tests on the same vehicles show lower emissions and lower CO2 for the WLTC [21,22]. Thus the WLTC is not going to give data that explains why air quality in cities is not improving in proportion to the improvement in vehicle emissions.…”

Section: The Number Of Stop/startsmentioning

confidence: 98%

“…However, in this work CF up to 90% have been measured and 95% in the worst congested parts of the route. The new WLTP is little improvement on the NEDC as the average speed is higher so the congestion is lower, which is the main reason why it has been found to give lower emissions than on the NEDC for many vehicles [21,22]. 3.…”

Section: Congested Traffic In Urban Areasmentioning

confidence: 99%

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Real World Driving: Emissions in Highly Congested Traffic

Khalfan¹,

Andrews²,

Li³

2017

SAE Technical Paper Series

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The emissions from vehicles in real world driving are of current concern, as they are often higher than on legislated test cycles and this may explain why air quality in cities has not improved in proportion to the reduction in automotive emissions. This has led to the Real Driving Emissions (RDE) legislation in Europe. RDE involves journeys of about 90km with roughly equal proportion of urban, rural and motorway driving. However, air quality exceedances occur in cities with urban congested traffic driving as the main source of the emissions that deteriorate the air quality. Thus the emissions measured on RDE journeys may not be relevant to air quality in cities. A Temet FTIR and Horiba exhaust mass flow measurement system was used for the mass emissions measurements in a Euro 4 SI vehicle. A 5km urban journey on a very congested road was undertaken 29 times at various times so that different traffic congestion was encountered. Each journey was split into ten sections in order that the location and traffic conditions of the highest emissions could be determined. It was found that low speed stop-start traffic has much higher emissions than for freely moving traffic and most of the higher emissions on the longer 5km journeys occurred in relatively short sections of slow moving stop/start traffic. The journey used passed a roadside air quality monitor that exceeded the EU NO2 and PM standards on an annual basis and it was located by the most congested part of the route, where the traffic emissions are shown in this work to be at their highest.