• 제목/요약/키워드: Road emission

검색결과 311건 처리시간 0.028초

연속류 위험도로구간에서의 운전자의 도로속도규정 준수에 따른 온실가스 변화량 연구 (Characterization of Potential Impact of Carbon Emissions under Speed Limit Enforcement on the Uninterrupted Flow)

  • 이종학;이숭봉
    • 한국도로학회논문집
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    • 제19권6호
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    • pp.175-182
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    • 2017
  • PURPOSES : Road sectors contribute approximately 16 % of total GHG emission rates in South Korea. Engineers and experts expend significant efforts to identify countermeasures for the reduction of carbon emission. This study aims to determine how total carbon emission rates change depending on whether or not there is speed limit enforcement. METHODS : In this study, Lamm's travel speed profile theory is first adopted to select the hazard road, which sections are designated as speed limit enforcement. Second, Motor Vehicle Emission Simulator (MOVES) was used to simulate the carbon emission on the road. RESULTS : The total carbon emission rate under speed limit enforcement was 10,773 g higher than the condition without speed limit enforcement in the designated road. This might affect acceleration, which can lead to increased emissions. CONCLUSIONS : There would be no researches about proving the relationship how speed limit enforcement has an effect on carbon emission. The result of our study can provide valuable guidelines regarding road safety and eco-friendly roads.

미시적 도로주행 조건을 반영한 배출량 산정 방법의 적용 사례 연구 (Application of an Emission Estimation Methodology to Reflect Microscale Road Driving Conditions)

  • 허혜정;윤천주;양충헌;김진국
    • 한국도로학회논문집
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    • 제18권3호
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    • pp.115-125
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    • 2016
  • PURPOSES : This study proposes a methodology to collect data necessary for microlevel emission estimation, such as second-by-second speeds and road grades, and to accordingly estimate emissions. METHODS : To ease data collection for microlevel emission estimation, a vehicle equipped with speed- and location-recording instruments as well as equipment for measuring road geometry was used. As a case study, this vehicle and the proposed methodology were used on a 10-km-long highway in Yongin City, Korea. Emissions from the vehicle during driving were estimated in various microscale driving conditions. RESULTS : Differences in the estimated emission under different microscale driving conditions cannot be ignored. Compared with the estimations obtained when second-by-second data were not considered, CO and NOx emissions were more than threefold higher when considering second-by-second speed; similarly, CO and NOx emission estimations were higher by approximately 10% and 3%, respectively, when considering second-by-second road grade. CONCLUSIONS : The proposed method can estimate vehicle emissions under real-world driving conditions in such applications as road design and traffic policy assessments.

이동식 배출가스 측정장비를 이용한 소형 경유 자동차의 실도로 질소산화물 배출특성 분석 (Evaluation of On-Road NOx Emission from a Light Duty Diesel Vehicle using a Portable Emissions Measurement System)

  • 이태우;이종태;김정수
    • 한국대기환경학회지
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    • 제28권1호
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    • pp.94-104
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    • 2012
  • The purpose of this research is to quantify the compliance of on-road emission from a light duty diesel vehicle, based on a comparison to emission regulation standard. $NO_x$, CO and THC emissions were measured using a portable device on a selected real-world driving route with a length of approximately 22 km. On-road measurements were repeated by 10 times on a same route to reflect variability in traffic conditions. A test route was divided into 22 road links with length of 1 km to analyze emission results with higher spatial resolution. The average emissions of $NO_x$, CO and THC over total travel distance, which is approximately 220 km, were quantified to be in compliance with emission regulation standards. Under higher spatial resolution, $NO_x$ concentration exceeded a standard in 92 links out of 220 links. The extended time in stop period and the stop-and-go driving cycle were identified as two important reasons for increased $NO_x$ emissions in observed cases. Heavy traffics showed higher $NO_x$ emissions than free flow. These results indicate that the real-world vehicle emissions might exceed the compliance level associate with traffic conditions. Another interesting observation of this research is that the on-road emission characteristics can be independent to the average speed of road links with higher spatial resolution. Variability in on-road emission might not be fully described by solely relying on an average speed, because variability in traffic conditions and road conditions can influence on real-world vehicle emissions.

Euro6 소형 경유자동차의 실제 도로 주행 NOx 배출량 평가 (Estimating On-road NOx Emissions of Euro 6 Light-duty Diesel Vehicles)

  • 박연재;박준홍;이재영
    • 한국분무공학회지
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    • 제21권4호
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    • pp.207-213
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    • 2016
  • To protect air pollution of urban area from motor vehicles, emission limits for diesel vehicles have been dramatically lowered in short period. But recent studies have shown that on-road NOx emissions of light-duty diesel vehicles are considerably higher than the values measured with laboratory test procedures used for emission certification. To tackle with this issue, Ministry of Environment have a plan to introduce EU RDE-LDV (Real-driving Emission-Light-duty Vehicle) regulation. In this study, 4 Euro 6 diesel vehicles have been tested with the new test procedures published by EU to estimate on-road NOx emissions using PEMS (Portable Emission Measurement System). The results have shown that the requirements of EU RDE-LDV could be met in driving condition of metropolitan area for constitution of test routes and validity of test results. In analysing with Moving Averaging Window method the completeness and normality of test data were validated with the requirement. On-road NOx emissions were quite deviated as test vehicles and higher than the new limit of on-road NOx emission enforced from Sept. 2017, which means that RDE-LDV can effectively reduce NOx emission of diesel vehicles in real driving conditions of Korea.

EGR 적용 비도로 엔진의 쿨러 열화에 따른 질소산화물 배출특성 (NOx Emission Characteristic according to Aging of EGR Cooler in Non-Road Diesel Engine)

  • 이경복;오광철
    • 동력기계공학회지
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    • 제20권5호
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    • pp.37-45
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    • 2016
  • Exhaust gas recirculation has the advantage of being low-cost and easy to control of NOx emission. Therefore, it is most generally used to reduce NOx emission according to strengthen regulation. In the case of a non-road engine, such as the agricultural engine, since it mainly operate a middle or high-load state, NOx emission is decreased in accordance with the mapping range of the EGR rate, but results in an increase in the particulate matter which is caused to deposit and fouling problem of the EGR system. This problem has become an important issue for maintaining the performance of the engine, as well as emission performance. This study had examined the effects of cooler aging on the performance of heat transfer efficiency and NOx emission in non-road diesel engine. As a result of the EGR cooler aging during 200 hours engine operation, the cooling performance decreased about 25% compared with that of fresh cooler and the NOx emission increased about 14.6% on NRSC(non-road steady cycle) and 20% on NRTC(non-road transient cycle) compared with that of fresh cooler respectively.

INFLUENCE OF OPERATION PATTERNS OF LIGHT-DUTY FREIGHT VEHICLES ON NOx POLLUTION AT LOCAL ROADSIDES

  • Saito, A.;Ueki, S.;Takada, Y.
    • International Journal of Automotive Technology
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    • 제7권3호
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    • pp.269-276
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    • 2006
  • Running tests on roads were conducted to clarify the influences of road infrastructure, traffic condition and vehicle's emission level to the amount of emission at local roadsides, and to reveal the operation patterns which can reduce the emission peaks. NOx emission peaks of two light duty freight diesel vehicles which have different emission levels were evaluated by using an on-board measurement system. Tests were carried out with various payload conditions and road conditions. As a result many NOx emission peaks were observed when the vehicles were starting or accelerating at intersections. The test vehicle which has higher emission level caused higher frequency and level of NOx emission peaks. Shifting up at lower engine speed in combination with lower acceleration brought out not only reduction of NOx emission peaks level but also of $CO_2$ mass emission.

비도로 수송에 의한 온실 가스 배출량 추정 (Estimation of Greenhouse Gas Emission from Off-road Transportation)

  • 최민애;김정;이호진;장영기
    • 한국기후변화학회지
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    • 제1권3호
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    • pp.211-217
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    • 2010
  • 건설 장비, 항공 지상 지원 장비, 항만 하역 장비, 농림업 기계를 포함하는 비도로 수송 부문의 경우 IPCC Guidelines의 배출원 분류 코드에 비도로 수송(1A3e2)이 존재하나, 국내에서는 배출자료가 구축되지 못하고 있다. 본 연구에서는 건설업, 항공, 해운, 농림업에 해당하는 석유 통계 자료를 유종별로 구분하였고, 1996 및 2006 IPCC Guidelines에서 제시하는 배출 계수로 Tier 1 수준의 비도로 수송 부문 온실 가스 배출량을 산출하고 비교하였다. 그 결과, 1996 IPCC Guidelines과 2006 IPCC Guidelines에 의한 2007년 비도로 수송 온실 가스 배출량은 각각 4,919천ton $CO_2eq./yr$, 5,530천ton $CO_2eq./yr$으로 나타났다. 본 연구에서 추정한 비도로 수송 온실 가스 배출량은 국내 수송 부문 온실 가스 배출량의 약 5.5%에 해당하는 양으로 추정되었다.

CVS-75 모드 시험과 실도로 주행 시험을 통한 배출가스 및 연비 성능 평가 (Fuel Economy and Emission Characteristics Evaluation by CVS-75 Mode Test and RDE(Real-road Driving Emissions) Test)

  • 강은정;엄준식;서영호
    • 융복합기술연구소 논문집
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    • 제4권2호
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    • pp.67-70
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    • 2014
  • Recently EU has been recognized that there is a difference of emission quantity between emission certification test mode and real-road driving test. Accordingly the European Commission is currently preparing to require real-road testing as part of the passenger car type-approval process in the EU. vehicle manufacturers from 2017 are expected to test new vehicles not only under laboratory conditions but also on the real-road, using PEMS equipment. Therefore the purpose of this study is to analyze the emission and Fuel Economy of CVS-75 mode test using chassis dynamometer and RDE test using PEMS equipment by PHEV passenger car.

탄소저감형 다차원 도로선형설계를 위한 솔루션 알고리즘 개발 (Development of Solution Algorithm for Multi-dimention Road Alignment Design Considering Low-Carbon)

  • 강전용;심창수
    • 한국BIM학회 논문집
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    • 제5권4호
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    • pp.11-22
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    • 2015
  • Government efforts for green growth policy initiatives demand low-carbon technologies in the road construction industry. The purpose of this paper is to develop an algorithm of a road alignment design solution for establishing the multi-dimensional information, and to calculate carbon emission quantity due to the geometric design elements in the planning phase of road alignment. The paper developed a calculation method for carbon emission quantity by drawing a speed profile reflected in the operating speed, acceleration and deceleration, which are majors factor of carbon emissions while driving and by applying a carbon emission factor. From this effort, it enabled alignment planning to reduce carbon emission. Object-based parametric design methods of the cross-sections were proposed for alignment planning, and the paper demonstrated a BIM-based road alignment planning solution. The proposed solutions can provide multi-dimensional information on carbon emission quantity and cross section elements through driving simulation. It is expected to allow construction of eco-friendly roads by deriving optimal road alignment to minimize environmental costs.

음향 인텐시티 측정법을 이용한 자동차의 소음방사특성에 관한 실험적 연구 I -엔진 및 배기계 부위소음을 중심으로- (An Experimental Study(I) on the Noise Emission Characteristics of Motor Vehicles Using Sound Intensity Measurement Method -A Case of Engine and Exhaust Noise-)

  • 양관섭;유남구;박병전;김영완
    • 소음진동
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    • 제6권6호
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    • pp.843-849
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    • 1996
  • Locations and emission characteristics of noise source of motor vehicles are great important factors to control the road traffic noise in effective ways. From results of this study on emission characteristics of engine and exhaust noise, we could find that every noise emission of different kind of vehicles has smilar pattern. The main emission locations of engine noise for the front of vehicle became the space between the road surface and bottom of the body and radiator grill, and for the side of vehicle became the space between the road surface and bottom nearby the front wheel. In case of exhaust noise of passenger-car and light truck, all the highest sound intensity level located near surface of road. But it is hard to conclude the height of noise source of driving vehicles with only results of this study. So further studies are needed to check the emission characteristics of noise.

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