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노후 운행경유차의 NOx 배출특성분석 및 조기폐차대책을 통한 삭감 방안 검토
길지훈,임윤성,김형준,노현구,윤보섭,이상은,이태우,김정수,최광호,Keel, Jihoon,Lim, Yunsung,Kim, Hyungjun,Roh, Hyungu,Yun, Boseop,Lee, Sangeun,Lee, Taewoo,Kim, Jeongsoo,Choi, Kwangho 한국액체미립화학회 2017 한국액체미립화학회지 Vol.22 No.3
Currently, the proportion of diesel vehicles in all automobile has grown significantly over the past few years. Air pollutant also grew up and became a social problem. In particular, the issue of NOx emissions caused by NOx high emission in real driving has become a global issue. Despite the fact that the regulatory and reduction project of the new vehicle is actively carried out, there are no existence regulations of In-use diesel vehicle's NOx emission. Therefore, the emission characteristics of the in-use diesel vehicles were investigated to seek ways to reduce NOx emissions in this study. The test targets were used in 237 close inspection of exhaust gases and model year varied from 1996 to 2011. However, the classification of emissions by emission standards differed considerably from NOx emissions. This means that the selection method for early retirement targets should be converted from model year to amount of emissions. If the current early retirement program was applied to the existing system, pre-Euro 3 was 22.530 g/km and Euro 4 was 21.810 g/km to NOx reduction. However, when the vehicle was changed to high emission target vehicle, NOx reduction increase maximum 84.705 kg/yr. According to the study results, an effective reduction in NOx emissions can be achieved if an earlier target in expanded to Euro 4 vehicles.
도로 기반시설 개선과 교통흐름 변화에 따른 소형 경유자동차의 대기오염물질 배출특성
길지훈 ( Jihoon Keel ),이태우 ( Taewoo Lee ),이상은 ( Sangeun Lee ),정성운 ( Sungwoon Jung ),윤보섭 ( Boseop Yun ),김정수 ( Jeongsoo Kim ),최광호 ( Kwangho Choi ) 한국액체미립화학회 2016 한국액체미립화학회지 Vol.21 No.4
Changes in road infrastructure affect driving patterns and pollutant emission characteristics. we analyzed the changes in driving patterns and pollutant emission characteristics of the driving route via measured driving patterns at year 2009 and 2016. Since 2009, there has been an increase in population and traffic demand, including residential areas and industrial facilities. Traffic conditions were improved such as the opening of the highway Inter-Change to Seoul and the construction of underground driveway. As a result, the average vehicle speed increased. More detail comparisons have made on the changes of the underground driveway section and the crossroad section, which are expected to have significant changes in the transportation infrastructure. The vehicle speed distribution of the underground driveway changed from low speed to high speed, and the increase of the time spent at the high speed and high load caused the increase of NO<sub>x </sub>emissions. The vehicle speed also increased at the crossroad section, and the consequence NO<sub>x</sub> and CO<sub>2</sub> emissions decreased. It is mainly because the decreased time spent at idle, which results from the proper traffic demand management at this area.
대형화물차의 누적주행거리 및 배기량에 따른 실도로 배출특성에 관한 연구
길지훈 ( Jihoon ),이종태 ( Keel ),임윤성 ( Jongtae Lee ),김형준 ( Yunseong Lym ),오승택 ( Hyungjun Kim ),이상현 ( Seungtaek Oh ),강건우 ( Sanghyun ),박철구 ( Lee ),김지은 ( Gunwoo Kang ),홍유덕 ( Cheolgu Park ),( Jieun Kim ),( You 한국액체미립화학회 2018 한국액체미립화학회 학술강연회 논문집 Vol.2018 No.-
최근 자동차 배출가스의 과다배출로 인한 대기오염의 심각성이 대두되고 있다. 특히 경유자동차의 경우 질소산화물(NOx)의 과다배출이 큰 이슈가 되어, 이를 개선하기 위해 배출허용기준강화, 배출가스 저감사업 등의 다양한 정책을 시행하고 있다. 이번 연구는 이러한 추세에 따라 경유자동차 중 많은 오염물질을 배출할 것으로 예상되는 대형화물차량에 대하여 PEMS(Portable Emission Measuremant System)을 이용한 실도로 배출가스 측정(Real Driving Emission, RDE) 결과를 차량의 누적주행거리 및 배기량에 따라 분석하였다. 그 결과 누적주행거리가 약 10 만 km 차이가 있을 경우 NOx 배출량은 약 10 배의 차이를 보였다. 또한 배기량이 2 배인 차량은 NOx 배출량이 약 3 배 높은 것으로 측정되었다.
소형 화물 차량의 적재량이 가속 주행 시의 연비 및 오염물질 배출에 미치는 영향
이태우(Taewoo Lee),길지훈(Jihoon Keel),전상진(Sangjin Jeon),박준홍(Junhong Park),이종태(Jongtae Lee),홍지형(Jihyung Hong) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.2
The effect of payload on fuel consumption and emission of light duty freight truck during acceleration driving has been analyzed. Running tests were carried out with various payload conditions on chassis dynamometer. A typical driving pattern for urban cities was used. Real time emission measurement systems for gaseous and soot emission were utilized to investigate the real time dynamic of fuel use and exhaust emissions. It was observed that fuel use and pollutant emissions were increased as payload was increased. Under the same payload condition, the increased amount of acceleration driving is much higher than that of steady state driving. The results demonstrated the advantages of eco-driving, which is an environmentally friendly driving manner, could be emphasized in heavier payload condition. Inertial tractive power was introduced for considering the parameters affecting emission during acceleration driving, which are speed, acceleration and payload. Fuel use and emission in various driving conditions were expressed as functions of inertial tractive power. The estimated result by these functions well predicted measured result within 10% deviation.
주행패턴의 상대 가속도에 따른 중소형 자동차의 온실가스 및 대기오염물질 배출 특성
이태우(Taewoo Lee),길지훈(Jihoon Keel),박경균(Kyungkyun Park),박준홍(Junhong Park),박용희(Yonghee Park),홍지형(Jihyung Hong),이대엽(Daeyup Lee) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.4
Although driving patterns strongly influence greenhouse gas and air pollutant emission rate from light duty vehicles, emission measurements have been mainly based on chassis dynamometer testing with one standard driving pattern. And there has been limited work on quantifying the independent effect of driving parameters on emission rate because of multidimensional nature of real-world driving pattern. The objective of this study is to obtain the quantitative effect of relative positive acceleration (RPA) on vehicle emission rate. RPA has been used to define the occurrence of acceleration demanding large amounts of power in certain driving distance and shown to be a significant affecting parameter for real-world emission rate. 40 driving patterns have been developed with fixed driving parameters to investigate independent effect of RPA. For the same values of average vehicle speed and power, the trend in carbon dioxide emission rate and fuel consumption with respect to RPA is very clear. Emission rate of nitrogen oxide and particulate matter also increase with respect to RPA, but the trend is less clear. Carbon dioxide emission from diesel vehicle appear to be more affected by high accelerations compared to that from gasoline vehicle because of high intake air restriction during acceleration caused by turbocharger and intercooler. The results have implications for the possible reduction of environmental effects through better traffic planning and management, driver education and car design.
자동차 환경검사에 의한 대기오염물질 배출계수 및 연비 산출
이태우(Taewoo Lee),길지훈(Jihoon Keel),박준홍(Junhong Park),엄명도(Myoungdo Eom),김종춘(Jongchoon Kim),이대엽(Daeyup Lee) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.5
An objective of this study is to give practical information that could be used for calculating pollutant emission factors and fuel economy from Korean Inspection & Maintenance program, which has been using steady state acceleration simulation mode. Concentration results from I/M test is adequately converted to mass emission factors and fuel efficiency data, which have unit of g/㎞ and ㎞/L, respectively. Exhaust volume flow(EVF), which is for converting emission result from concentration to mass, is measured by tracer method in various vehicle speed - power condition. It is found that there is an apparent second order relationship between EVF and vehicle inertia weight. EVF is expressed in function of vehicle inertia weight in order to estimate EVF in I/M site without measuring device. Converted mass emission results from measured EVF and raw emission analyzer show a satisfactory agreement with those from conventional CVS-bag type measurement system. Mass emission factors and fuel efficiency from measured EVF and estimated EVF also show good agreement to each other. Considering that an I/M program has great advantages to recruit-based emission test in terms of the number of test vehicle, the information in this study can be used for developing an alternative procedure to collect more various data to establish national database of mobile emission factors and fuel economy, even though the driving cycle in I/M program is steady state cycle rather than transient cycle.
보증기간을 지난 LPG 택시의 삼원촉매 성능저감율 비교
박용희(Yonghee Park),길지훈(Jihoon Keel),고종민(Jongmin Ko),강건우(Gunwoo Kang),권상일(Sangil Kwon) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
LPG vehicles accounted for 13% of the entire vehicle registration number, and LPG Taxi is approximately 11% for full of LPG vehicles. These taxis past the warranty period to easy because taxis driving-patterns. Thus, many number of LPG taxis past of warranty period. Also Atmospheric Environment is expected to have a big impact due to the aging of the three-way catalyst. so, LPG taxis past the warranty period for the three way catalyst exhaust gas test was performed. Test was runnig on a chassis dynamometer, test mode use CVS-75 mode. Test vehicle was select on 13 car. Fix the distance average each 200000, 250000, 300000, 350000km ±10000 km. Compared there distance to stand for 200000km, THC was show to increase tendency -3%, 62%, 68%, CO was show to steady tendency -12%, 10% and 28%, NOx was show to increase tendency -15%, 32%, -14%. But this result is under of new car"s emission standard. and very small. Thus, the reason of not different each other. Only NOx Emission is over from New-car Emission standard.
도로 주행 중의 비출력 및 가속도 조건을 반영한 차속별 배출계수 연구
이태우(Taewoo Lee),길지훈(Jihoon Keel),박준홍(Junhong Park),박용희(Yonghee Park),홍지형(Jihyung Hong),이대엽(Daeyup Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.1
The performance of emission factor has been validated by comparison with on-road test data. Emission factor, which is a function of vehicle speed, has been acquired based on chassis dynamometer test with NIER driving pattern. Portable Emission Measurement System, PEMS has measured on-road emission. Test vehicle was operated on defined test routes under different driving conditions, and made ten trips along its route. Emission factors properly simulate on-road test result, although there is some drawback to consider variety of driving condition on real world. Vehicle specific power and acceleration have been used to explain the distributed on-road result within same vehicle speed range. The trend in carbon dioxide and nitrogen oxide emission with respect to specific power and acceleration is clear. It has been found that specific power is a good explanatory variable for microscopic analysis for modal test result. Acceleration is good for microscopic as well as macroscopic analysis.
유동인구 밀집지역 인근의 도로구간별 배출량 산정 및 보행자 노출 강도 평가
이상은,신명환,이석주,홍다희,장동익,길지훈,정택호,이태우,홍유덕,Lee, Sangeun,Shin, Myunghwan,Lee, Seokjoo,Hong, Dahee,Jang, Dongik,Keel, Jihoon,Jung, Taekho,Lee, Taewoo,Hong, Youdeog 한국액체미립화학회 2018 한국액체미립화학회지 Vol.23 No.2
The objective of this study is to estimate the level of exposure of traffic-related air pollutants (TRAPs) on the pedestrians in Seoul area. The road network's link-based pollutant emission was calculated by using a set of mobile source emission factor package and associated activity information. The population information, which is the number of pedestrian, was analyzed in conjunction with the link-based traffic emissions in order to quantify exposure level by selected 23 spots. We proposed the Exposure Intensity, which is defined by the amount of traffic emission and the population, to quantify the probability of exposure of pedestrian. Link-based traffic NOx and PM emissions vary by up to four times depending on the location of each spot. The Hot-spots is estimated to be around 1.8 times higher Exposure Intensity than the average of the 23 selected spots. The information of Exposure Intensity of each spot allows us to develop localized policies for air quality and health. Even in the same area, the Exposure Intensity over time also shows a large fluctuation, which gives suggestions for establishing site-specific counter-measures.