• Title/Summary/Keyword: Low Emission Vehicle

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RESEARCH ON ULTRA LOW EMISSION TECHNOLOGY FOR LARGE DISPLACEMENT MOTORCYCLES

  • Kono, T.;Miyata, H.;Uraki, M.;Yamazaki, R.
    • International Journal of Automotive Technology
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    • v.7 no.3
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    • pp.277-282
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    • 2006
  • With the aim of achieving half the regulated value of EURO-3 Emission Regulations, an ultra low emission motorcycle has been developed based on a motorcycle with an 1800 $cm^3$, horizontal opposed 6-cylinder engine. For the fuel supply system, an electronically controlled fuel injection system was applied. For the emission purification system, three-way catalysts, a feedback control system with a LAF(Linear Air-Fuel ratio) sensor, and a secondary air induction system were applied. To reduce CO and HC emissions during cold starting, an early catalyst activation method combining RACV(Rotary Air Control Valve) and retarded ignition timing was applied. After the catalyst activation, air-fuel ratio was controlled to maximize the purification ratio of the catalyst according to vehicle speed. For the air-fuel ratio control system, the LAF sensor was used. Furthermore, fine adjustment by the LAF feedback control reduced torque fluctuation due to the air-fuel ratio change. As a result, smooth ride feeling was maintained. Owing to these technologies, half the regulated value of EURO-3 has been achieved without any negative impact to the large-scaled motorcycles' drivability. This paper presents the developed ultra low emission technologies including the control method using an LAF sensor.

Air Pollutant Emission Characteristics of a Light Duty Diesel Vehicle Affected by Road Infrastructure Improvement and Traffic flow Changes (도로 기반시설 개선과 교통흐름 변화에 따른 소형 경유자동차의 대기오염물질 배출특성)

  • keel, Jihoon;Lee, Taewoo;Lee, Sangeun;Jung, Sungwoon;Yun, Boseop;Kim, Jeongsoo;Choi, Kwangho
    • Journal of ILASS-Korea
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    • v.21 no.4
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    • pp.214-222
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    • 2016
  • 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 NOx emissions. The vehicle speed also increased at the crossroad section, and the consequence NOx and $CO_2$ emissions decreased. It is mainly because the decreased time spent at idle, which results from the proper traffic demand management at this area.

A Study on the Acceptable Range of Data Error in Road Traffic Noise Mapping (도로교통 소음지도 제작시 데이터 오차의 유효범위에 대한 연구)

  • Park, S.J.;Ko, J.H.;Chang, S.I.;Lee, B.C.;Song, K.S.;Kim, J.S.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.628-632
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    • 2007
  • The purpose of study is to confirm a acceptable range of data errors in data collecting. To examine a acceptable range of data errors, emission level is calculated for a vehicle flow and heavy vehicle percentage as a function of small-sized velocity. According to road selected, noise level of detail influence road noise calculations. It can be concluded that a vehicle flow raised an error less than 5000(veh/h) for a maximum error in emission level of 3.01dB, and the more a heavy vehicle percentage have a low value, the more emission level is a slight difference. This analysis gives insight regarding the accuracy of traffic flow data that is needed to reach a certain level of accuracy for the resulting noise level.

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Evaluation of CO2 Reduction Effected by GHG Reduction Policy of Vehicle (자동차 온실가스 저감정책에 따른 이산화탄소 저감 효과 평가)

  • Park, Yeon Jae;Kwon, Sang Il;Lee, Jae Young
    • Journal of Korean Society for Atmospheric Environment
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    • v.32 no.3
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    • pp.280-288
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    • 2016
  • Greenhouse gas (GHG) emissions have given rise to climate change which is one of the most serious environmental challenges that the world faces today. In response, Republic of Korea has proposed "Low Carbon, Green Growth" as a new economic paradigm accompanying with the ultimate aim of building a sense of responsibility for the environment. Korean government has set the ambitious national GHG emission reduction target which aims 37% reduction in the business-as-usual (BAU) level of 2030. The transportation sector plays a key role in this target. In the transportation sector, the GHG reduction target of 34.3% in the BAU level by 2020 has been allocated in order to consider the industrial specificity. Furthermore, it is known that the GHG reduction in the transportation sector has relatively minimal side effects compared to those of other sectors. In order to meet this national GHG reduction target, Korean government has set $CO_2$ emission regulation of vehicle for 2020. The purpose of this study is to evaluate the reduction effects by the average GHG regulation of vehicles. $CO_2$ emissions, between 2009 and 2013 were analysed by reduction measure such as technology improvement, light-weight, segment shift, diesel vehicle sales. During this period, $CO_2$ of vehicle was reduced every year by 19.9 g/km (i.e., 3.3% reduction per year). $CO_2$ reduction of imported vehicle is greater than domestic vehicle because of segment shift toward small size vehicle and higher diesel vehicle sales.

A Study on the Source Profile of Volatile Organic Compounds from Major Emission Sources (휘발성 유기화합물의 주요 배출원의 배출물질 구성비에 관한 연구-오존 생성 전구물질을 중심으로-)

  • 김소영;한진석;김희강
    • Journal of Korean Society for Atmospheric Environment
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    • v.17 no.3
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    • pp.233-240
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    • 2001
  • The composition of volatile organic compounds (VOCs) was anlyzed for major emission sources such as vehicle exhaust, gasoline and diesel vapor, organic solvent vapor, and butane fuel gas. Low carbon-numbered hydrocarbons were found to be the dominant components of gasoline vehicle exhaust. In gasoline evaporative vapor, the predominant constituents were found to be butane and iso-pentane regardless of ambient air temperature. In case of diesel evaporative vapor was similar to those of gasoline evaporative vapor. The composition of organic solvent vapor from painting, ink and petroleum consisted mostly or aromatic compounds such as toluene and m, p, o-xylene. The hydrocarbon fraction of butane fuel gas. which is used by portable bunner, consisted mainly of propane (34%) and butane(70%).

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High-Frequency Circuit Modeling of the Conducted-Emission from the LDC System of a Electric Vehicle (전기자동차 LDC 시스템의 전도 방출에 관한 고주파 모델링 연구)

  • Jung, Kibum;Jo, Byeong-Chan;Chung, Yeon-Choon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.8
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    • pp.798-804
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    • 2013
  • In this paper, conducted emission from the LDC(Low-Side DC/DC Converter) of a HEV/EV was analyzed using high-frequency circuit modeling in system-level approach. The conducted emission by PWM process(100 kHz; Switching Frequency) can cause RFI(Radio-Frequency Interference) problems in the AM/FM frequency range. In order to mitigate this conducted emission, a high-frequency equivalent circuit model is proposed by analyzing the fundamental circuits, parasitic components in their parts and connections and non-linear characteristics of MOSFETs, high-power capacitors, inverters, motors, high-power cables, and bus bars which are composed of the LDC. Using these circuit models, results of both simulation and measurement were compared and similarities between them were verified. We are looking forward that this approach can be effectively used in the EMC design of HEV/EV.

Emission Characteristics of GTL(Gas to Liquid) Fuel in Diesel Engine (디젤 엔진에서 GTL(Gas to Liquid) 연료의 배출물 특성에 관한 연구)

  • Lee, Yong-Gyu;Moon, Gun-Feel;Choi, Kyo-Nam;Jeong, Dong-Soo;Kim, Byoung-Jun;Cha, Kyung-Ok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.5
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    • pp.84-91
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    • 2008
  • Due to increasing need for better emission characteristics and lower fuel consumption rate in automotive engines, alternative fuels are drawing more attentions recently. The GTL (gas to liquid) is the one of most favored candidates. In this study, emission characteristics are compared between diesel and GTL fuel in commercial 2.0 liter diesel engine and vehicle with CRDi(Common Rail Direct injection) system. The effects of injection timings on emission and fuel consumption rate are compared at various engine speeds and loads. Noticeable reduction in HC, CO and PM emissions are observed due to higher cetane number and low sulfur and aromatic contents in GTL. On the trade-off curve of NOx and PM(Particulate matter) GTL showed much more benefits than diesel, where about 30% of PM mass decreased at the same operating conditions. On CVS 75 mode test in vehicle, GTL showed an excellent emission enhancement, in which 50% of HC, 21% of PM, and 12% of NOx engine-out emissions are decreased compared to ULSD(Ultra low sulfur diesel) fuel.