• Title/Summary/Keyword: Real driving emission

Search Result 64, Processing Time 0.022 seconds

3-Dimensional Emission characteristics of an AC PDP Cell

  • Jung, Jae-Chul;Jeong, Dong-Cheol;Bae, Hyun-Sook;Whang, Ki-Woong
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.529-532
    • /
    • 2004
  • The spatio-temporal variation of Infra Red(IR) emission images were obtained from a real 3-dimensional discharge space of a surface discharge type, alternating current plasma display panel(AC PDP) cell with the Ne-Xe(4%) 400Torr gas mixture. IR emissions were observed in each period of the ADS(Address and Display Separation) driving scheme with ramp initializing waveform using an images intensified charge coupled device(ICCD) camera. The roles of each electrode were identified and it was compared with the results of the discharge simulation and of the wall charge distributions measured by the electro-optic technique.

  • PDF

Application and Estimation of Environment Pollutant Emission Considering Vehicle Driving Cycle - Focusing on Feasibility Study - (차량주행주기를 감안한 환경오염물질 산정 및 적용 - 타당성 평가 적용을 중심으로 -)

  • Chung, Sung-Bong
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.33 no.4
    • /
    • pp.223-230
    • /
    • 2011
  • According to EMEP/EEA Emission Inventory Guidebook, the emissions produced by vehicle in cold start phase should be calculated differently compared to hot start phase. In this study, considering this driving cycle, more appropriate procedures for estimating Environmental Benefits was suggested. Using Tier 3 standard, all links within the impact area were included in estimating emissions. Traffic volume and travel distance were analyzed using EMME/3 software. For application of the procedures in this study, the case study was carried out with real transportation project. As a result, the Environment-Benefits increased by 30%. If the methodology suggested in this study is applied to feasibility study it will help to activate the investment of the environment-friendly modes like railway in the future.

Improvement of the Emission model Based on Average Speeds in the Transportation Sector (평균차속을 이용한 교통부문 온실가스 배출량 산출 모형의 보완방향)

  • Kim, Young-Ho;Hong, Sung-Jin;Lee, Tae-Woo;Park, Jun-Hong
    • Journal of Korean Society of Transportation
    • /
    • v.30 no.2
    • /
    • pp.117-126
    • /
    • 2012
  • The transportation sector accounts for 33% of the total $CO_2$ emissions. Effective control measures for reducing $CO_2$ emissions are urgently needed to address global warming. Objective and reliable methods to estimate $CO_2$ emissions are a prerequisite for the implementation of such effective control measures. However, existing models have not been successful. Even though the average-speed model is one of the most convenient and useful methods for estimating $CO_2$ emissions, it cannot distinguish between a variety of roads as well as traffic conditions in the model. The results of this study found that there may be significant discrepancies between emissions estimated by the current average-speed model and those measured in real driving conditions. This paper proposed the subdivision of emission factors in the average-speed model depending on both traffic and road conditions.

Parametric investigation of a hybrid vehicle's achievable fuel economy with optimization based energy management strategy

  • Amini, Ali;Baslamisli, S. Caglar;Ince, Bayramcan;Koprubasi, Kerem;Solmaz, Selim
    • Advances in Automotive Engineering
    • /
    • v.1 no.1
    • /
    • pp.105-121
    • /
    • 2018
  • The hybrid electric powertrain is a robust solution that allows for major improvements in both fuel economy and emission reduction. In the present study, a through-the-road hybrid vehicle model with an electric motor driving the rear axle and an Internal Combustion Engine (ICE) driving the front axle has been constructed. We then present a systematic method for the determination of a real time applicable optimal Energy Management Strategy (EMS) for a hybrid road vehicle. More precisely, we compare the performance of rule-based EMS strategies to an optimization-based strategy, namely ECMS (Equivalent Consumption Minimization Strategy). The comparison is conducted in parallel with a parameterization of the size of the internal combustion engine and the implementation of a Continuously Variable Transmission (CVT) that allows following the line of best fuel economy. For the FTP-75 driving cycle, the constrained engine On-off control algorithm is shown to offer a 28% improvement potential of fuel consumption compared to the conventional internal combustion engine while the ECMS strategy achieves an improved potential of nearly 33%.

Estimation on the Emission Reduction of SULEV LPG Vehicles (SULEV LPG 자동차의 배출가스 저감효과 평가)

  • Park, Jun-Hong;Lee, Jong-Tae;Kim, Sun-Moon;Kim, Jeong-Soo;Kang, Dae-Il;Lim, Yun-Sung;Han, Bo-Young
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.28 no.1
    • /
    • pp.68-76
    • /
    • 2012
  • SULEV (Super Ultra Low Emission Vehicle) which is one of the emission standards in Fleet Average System introduced to Korea from 2009 is known as the most severe standard to achieve with internal combustion engine. Considering low sales volume of hybrid vehicles in Korea, vehicle manufacturers are required to develop SULEV technologies for conventional gasoline and LPG vehicles to meet the future Fleet Average standard. In this study, the comparison of emissions has been made between SULEV developed and ULEV LPG vehicles mainly produced in this time. To estimate the emission reduction of SULEV vehicles, CVS-75 and NIER test modes have been used. CVS-75 has been used for emission certification of gasoline and LPG vehicles. NIER modes cover various average vehicle speed and reflect Korean real driving patterns better than CVS-75. The test results show that SULEV LPG vehicles have very high potential to reduce $NO_x$ in regulated emissions, $N_2O$ in green house gases and toluene in VOCs. However, SULEV LPG vehicles don't affect much on the reduction of CO and total green house gases.

A Review of Emissions Studies for Transportation Engineering (교통환경분야의 국내외 연구동향 및 시사점 (차량배출량 관련 연구를 중심으로))

  • Gang, Jong-Ho;Lee, Cheong-Won
    • Journal of Korean Society of Transportation
    • /
    • v.25 no.6
    • /
    • pp.7-18
    • /
    • 2007
  • There are few studies on air pollution due to vehicle emissions in spite of the importance of this field. Therefore, this study describes trends and suggests implications through analysis relating to existing emissions research. This study has been divided into three areas. The first part is about estimating vehicle emissions. In this part, the authors analyze limits in ways of calculating emissions in the existing macroscopic view and then suggest the development of a model for calculating emissions considering velocity and acceleration. These variables are a function of traffic and individual driving behavior in the microscopic view. The second part is about management techniques for reducing vehicle emissions. The traffic management techniques for reducing vehicle emissions should conform to regional characteristics. The final part is about traffic operation for reducing vehicle emissions. The authors suggest the development of a micro-simulator and then the development of strategies for traffic operation. It is necessary to design better models estimating emissions and then, using real time data, to make a monitoring system simulating emission rates. This study serves as a literature review to make a foundation for further research about emissions research for transportation engineering.

Dissimilar Friction Welding for Marine Shock Absorber Steels and its Evaluation by Acoustic Emission (해양차량 쇽업소버용 강재의 이종 마찰용접과 AE평가)

  • LEE BAE-SUB;KONG YU-SIK;KIM SEON-JIN
    • Journal of Ocean Engineering and Technology
    • /
    • v.19 no.1 s.62
    • /
    • pp.44-48
    • /
    • 2005
  • The shock absorbers for marine vehicles are very important components to absorbing the shock resulting from driving. Depending on the kinds of vehicles, these essential components, piston and piston rod, must be made of S25C, S45C, and SCM440, must be precisely machined, and assembled by the bolts. Other materials used have been difficult to weld, and could be unstable in quality, by the conventional arc welding. Also, they have been associated with a lot of technical problems in manufacturing. However, using the friction welding technique, such problems will be avoided. These factors have necessitated the domestic development of the marine shock absorber using a friction welding, as well as stimulating a new approach to the study of real-time weld quality evaluation by AE techniques.

A Study on the Evaporative Emission Characteristics of Korean Gasoline Vehicles (국내 휘발유 자동차의 증발가스 배출 특성에 관한 연구)

  • Park, Jun-Hong;Park, Young-Pyo;Lim, Yun-Sung;Lee, Jong-Tae;Kim, Jung-Su;Choi, Kwang-Ho
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.4
    • /
    • pp.121-129
    • /
    • 2011
  • Hydrocarbons which are the main sources of VOCs from motor vehicles are emitted not only from the engine exhaust gas but also from evaporation of the fuel in storage and supplying systems. Evaporative emissions from gasoline fuel systems could be classified by diurnal, hotsoak and running loss. Diurnal loss test procedures are different as countries. Korea introduced new evaporative regulation in 2009 with 24hour VT-shed test procedure and relaxed emission standards. The estimations on different test procedures in this study show that the new Korean regulation get a little more severe than before and the 2 day diurnal loss test of U.S. is the most severe. So the test procedures as well as the stronger standards should be considered in the next evaporative emission regulation to reduce VOCs from motor vehicles. The important parameters to affect evaporative emissions are air and fuel temperature and fuel vapor pressure. Diurnal loss increases exponentially as rising air temperature and vapor pressure. The effects of vapor pressure on running loss are different as the capacities of canisters. Tests with simulating real temperature and driving conditions show that hydrocarbons in evaporative emissions could be more than those in exhaust gas in summer season because of the higher air temperature.

A Study of Greenhouse Gas Emission Rates from LDTs according to Emission Certification Modes and Real-World Vehicle Driving Cycles in Korea (차량인증모드와 실도로 주행모드별 국내 경유 소형화물 자동차의 온실가스 배출특성 분석)

  • Kim, Ji Young;Seo, Chungyoul;Son, Jihwan;Park, Junhong;Moon, Taeyoung;Lee, Sangeun;Kim, Jeongsoo
    • Journal of Climate Change Research
    • /
    • v.3 no.4
    • /
    • pp.235-243
    • /
    • 2012
  • Mobile sources are one of the most significant contributors to the inventory of greenhouse gas (GHG). The administration in Korea has set a goal of cutting GHG emissions of vehicles by 34.3% compared to Business As Usual (BAU) by 2020. To achieve this goal, GHG emission standards for vehicles have been applied since 2012, and now light-duty trucks are under consideration to be included to the vehicle types that will be regulated in the new version of GHG emission standards. Therefore, this study focuses on analyzing characteristics of exhaust GHGs (CO2, CH4, and N2O) emissions of diesel light-duty trucks according to their various driving modes. GHGs emissions of diesel light-duty trucks reduced in inverse proportion to the speed of the vehicles. GHGs emissions from the combined mode were 8% and 14% lower than those from the CVS- 75 and NEDC modes, respectively.

A Study on the Characteristics of DPF System of Peugeot 607 Diesel Passenger Car (Peugeot 607 경유승용차의 매연여과장치 특성 분석)

  • 김홍석;김진현;신동길;조규백;정용일;김강출;이영재
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.12 no.3
    • /
    • pp.66-74
    • /
    • 2004
  • DPF technology has been considered as one of the most effective methods for reducing diesel particulate emission. PSA Peugeot Citroen introduced the DPF equipped diesel passenger car, Peugeot 607 HDI Sedan, in 2000 for the first time in the world, in which SiC filter, an oxidation catalyst, cerium based fuel born catalyst and post-injection technology were used for PM regeneration. In the present study, the characteristics of the Peugeot 607 DPF system were studied on chassis dynamometer and real road driving conditions. The change of emissions and fuel economy during 80,000km operation were also tested. Additionally, ash contents accumulated in the DPF filter was analyzed and particle size distributions was investigated after running of 80,000km.