Determination of GHG Emissions, Fuel Consumption and Thermal Efficiency for Real World Urban Driving using a SI Probe Car

Li, Hu; Khalfan, Ahmad; Andrews, Gordon E.

doi:10.4271/2014-01-1615

Cited by 8 publications

(4 citation statements)

References 16 publications

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“…The TTW efficiency for combustion engines is about 16%-20% when all driving situations are included, as reported by [4]. However, this number varies depending on the driving situation.…”

Section: Introductionmentioning

confidence: 81%

Estimation of tank-to-wheel efficiency functions based on type approval data

Hjelkrem¹,

Hjelkrem²,

Arnesen³

et al. 2020

Preprint

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“…The TTW efficiency for combustion engines is about 16%-20% when all driving situations are included, as reported by [4]. However, this number varies depending on the driving situation.…”

Section: Introductionmentioning

confidence: 81%

Estimation of tank-to-wheel efficiency functions based on type approval data

Hjelkrem¹,

Hjelkrem²,

Arnesen³

et al. 2020

Preprint

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“…50% of the trips were <4km, 25% were 4-8km and only 25% were for distances >8km. This justifies the use of a 5km trip distance in the previous work of the authors [13,[15][16][17] and in this work. The trip analysis of Liu et al [23] also shows the unrealistic trip distance in RDE test procedures, as <1% of journeys were of this length.…”

Section: Introductionmentioning

confidence: 84%

“…These modelled results were based on traffic counts and the certified emissions on the NEDC test cycle. The modelled NO2 concentration, at the roadside site in the middle of the present road journey, was 47% lower than the measured results and 28% lower for the city centre site [12,[15][16][17]. The NO2 measurements showed 14 sites in Leeds above the EU limit where the model only predicted 4 sites in exceedance.…”

Section: Introductionmentioning

confidence: 99%

“…However, if the test cycle conditions are well removed from current real world driving, then there is concern that the emissions on the legislated test cycle may be unrepresentative of real world driving and result in air quality not being improved as intended. This has led to the development of the WLTC test procedures and real world emissions measurement using portable emissions measurement systems (PEMS) [15][16][17] or Real Driving Emissions test procedures (RDE) [18][19][20]. The intention was that these new test cycles were more representative of real world driving.…”

Section: Introductionmentioning

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.

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