Evaluation of real driving emissions for Euro 6 light-duty diesel vehicles equipped with LNT and SCR on domestic sales in Korea

Self Cite

Despite the strengthening of vehicle emissions standards and test methods, nitrogen oxide (NOx) emissions from on-road mobile sources are not being notably reduced. The introduction of real driving emission (RDE) regulations is expected to reduce the discrepancy between emission regulations and actual air pollution. To analyze the effects of RDE regulations on heavy-duty diesel vehicles, pollutants emitted while driving were measured using a portable emission measurement system (PEMS) for Euro 5 and Euro 6 vehicles, which were produced before and after RDE regulations, respectively. NOx emissions were compared as a function of emissions allowance standards, gross vehicle weight (GVW), average vehicle speed, and ambient temperature. NOx emissions from Euro 6 vehicles were found to be low, regardless of GVW; emissions from both vehicular categories increased with a decline in the average speed. To reflect real road driving characteristics more broadly in the RDE test method for heavy-duty vehicles, it is necessary to consider engine power, which is a criterion for classifying effective sections, in the moving average window (MAW) analysis method, as well as including cold start conditions.

Section: Discussionmentioning

confidence: 99%

Section: Euro 5 and Euro 6 Vehicle Emissionsmentioning

confidence: 99%

NOx Emissions from Euro 5 and Euro 6 Heavy-Duty Diesel Vehicles under Real Driving Conditions

Park

Kang

et al. 2020

Self Cite

“…For European diesel vehicles, Degraeuwe and Weiss [6] showed the median of on-road NOx for seven Euro 4-6 diesel vehicles exceeded by 2.7 times those measured on the NEDC and the analysis of PEMS data from 39 Euro 6b diesel passenger cars by O'Driscoll et al [7] exhibited wide variability in NOx emissions 2 of 13 from 1 to 22 times of the laboratory limit (0.08 g/km) with the average of 0.36 g/km. For Korean diesel vehicles, Cha et al [8] measured on-road NOx for 17 Euro 6b diesel vehicles equipped with lean-NOx trap (LNT) or selective catalytic reduction (SCR) and the averaged on-road NOx was 6.6 times of laboratory limit.…”

Section: Introductionmentioning

confidence: 99%

Developing On-Road NOx Emission Factors for Euro 6b Light-Duty Diesel Trucks in Korean Driving Conditions

Park

Shin

2021

Self Cite

This study aimed to develop on-road NOx emission factors for Euro 6b light-duty diesel trucks (LDDTs) in Korea. On-road NOx emissions were measured using portable emissions measurement systems and compared with those measured using the Korean Driving Cycle (KDC), the conventional laboratory test used to develop emission factors. To ensure the representativeness of the LDDTs emission factors, five vehicles of three models were driven along two real driving routes for total traveled mileage of 2280 km. On-road NOx levels were 2.1 to 6.9 times higher on average than those measured using the KDC because the latter does not cover the wide variability in vehicle speed and relative positive acceleration, common in real driving conditions. The lean-NOx trap was found to have disappointingly low NOx reduction efficiency in on-road driving. The on-road NOx emission factors by vehicle speeds developed in this study were comparable to the COPERT 4 factors.

“…For example, NO X emissions during an on-road emissions test have been frequently reported to be significantly higher than the measured emissions during a standard driving cycle (e.g., New European Driving Cycle (NEDC) and Worldwide Harmonized Light Duty Cycle (WLTC)) running on a chassis dynamometer in an emissions laboratory [4]. Additionally, many independently tested vehicles also exceed the emissions limits defined in the regulation for type approval tests [5][6][7][8][9]. Owing to the significant difference between the measured emissions during a homologation test in a laboratory compared to an on-road test, several national investigation programs such RDW [10] and GOV.UK [11] were launched to investigate.…”

Section: Introductionmentioning

confidence: 99%

Practicalities and Driving Dynamics of a Real Driving Emissions (RDE) Euro 6 Regulation Homologation Test

Bodisco

Zare

2019

One of the most important sources of air pollution, especially in urban areas, is the exhaust emissions from passenger cars. New European emissions regulations, to minimize the gap between manufacturer-reported emissions and those emitted on the road, require new vehicles to undergo emission testing on public roads during the certification process. Outlined in the new regulation are specific boundary conditions to which the route on which the vehicle is driven must comply during a legal test. These boundary conditions, as they relate to the design and subsequent driving of a compliant route, are discussed in detail. The practicality of designing a compliant route is discussed in the context of developing a route on the Gold Coast in Queensland, Australia, in a prescriptive manner. The route itself was driven 5 times and the results compared against regulation boundary conditions.