• Title/Summary/Keyword: Gasoline Engine

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Development of a High Energy Ignition System Using Corona Discharge (코로나 방전을 이용한 고에너지 점화 시스템 개발)

  • Park, Kyongseok;Choi, Duwon;Kang, Hyehyun;Lee, Jonghwa;Park, Jinil
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.6
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    • pp.650-655
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    • 2015
  • A high energy ignition system is essential for lean burn or high EGR gasoline engine, which is getting more and more interest to improve fuel economy. The high energy ignition systems comprise plasma jet, laser beam, corona discharge and so on. In this study, a high energy ignition system using corona discharge is developed and tested in a constant volume combustion chamber. The developed system shows extension of lean limit of propane-air mixture and enhencement of combustion speed. Various shape of corona discharge plugs are also tested and compared in this study.

Design Using Finite Element Analysis of a Switched Reluctance Motor for Electric Vehicle

  • Ohyama Kazuhiro;Nashed Maged Naguib F.;Aso Kenichi;Fujii Hiroaki;Uehara Hitoshi
    • Journal of Power Electronics
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    • v.6 no.2
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    • pp.163-171
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    • 2006
  • In this paper, a Switched Reluctance Motor (SRM) employed in an electric vehicle (EV) is designed using the finite element method (FEM). The static torque of the SRM is estimated through magnetic field analysis. The SRM temperature rise over operation time is estimated through heat transfer analysis. First, static torque and temperature rise over the time of 600W SRM is included in the experiment set, and are compared with the calculated results using the FEM under the same conditions. The validity of the magnetic field analysis and heat transfer analysis is verified by the comparisons. In addition, a 60 [kW] SRM employed in an EV, whose output characteristics are equal to a 1500 [cc] gasoline engine, is designed under magnetic field analysis and heat transfer analysis.

An Experimental Study on Breakdown of Fuel Consumption on a Component Basis in a Gasoline Engine Vehicle (가솔린 차량의 각 요소별 연료소모량 분석을 위한 실험적 연구)

  • 유정철;송해박;이종화;유재석;박영무;박경석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.1
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    • pp.153-161
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    • 2004
  • A vehicle fuel economy is one of the most important issues in view of environmental regulation and customer's needs. In order to improve the vehicle fuel economy, great efforts has been carried out on the components bases. However, systematic analysis of vehicle fuel consumption is necessary for the further improvement of vehicle fuel economy. In this paper, a methodology for the breakdown of vehicle fuel consumption was studied and proposed for systematic analysis of the vehicle fuel economy. The energy equation for the vehicle power train was set up for the analysis of the vehicle fuel economy and simplified to be calculated or estimated using the measured data in a vehicle. The amount of fuel that was used in vehicle components under arbitrary driving conditions was quantified.

Visualization and Numerical Analysis of Non-evaporating Spray with a Swirl-Type GDI Injector (GDI 와류 분사노즐에 의한 비증발 분무의 가시화 및 수치해석)

  • 원영호;강수구
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.4
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    • pp.22-28
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    • 2003
  • Predictions of the fuel spray dispersion and mixing processes are very important to improve the fuel consumption and exhaust emissions in GDI engines. Numerical and experimental analysis of the sprays with a swirl injector have been conducted. A numerical analysis is carried out using KIVA-II code with modified spray models. Experimental measurements are performed to show the global spray images and the local images near nozzle tip using laser sheet visualization technique. Computed and measured spray characteristics such as spray width, tip penetration are compared, and good agreements can be achieved. The spray head vortex is stronger as the injection pressure increases, but numerical calculations cannot show the head vortex properly.

Synthesis and Lubrication Properties of Semi-Fluorinated Polyol Esters (불소계 폴리올에스테르의 합성과 윤활 특성)

  • 백진욱;정근우;김영운
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2001.06a
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    • pp.149-155
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    • 2001
  • New semi-fluorinated polyol esters were synthesized by condensation reaction of polyols (NPG and TMP) and carboxylic acids such as 2-ethylhexanoic acid, stearic acid and perfluorooctanoic acid. The structures of polyol esters were confirmed by FT-IR and H-NMR etc. And, the fluorinated polyol esters were insoluble in several oils, however, the semi-fluorinated polyol esters were soluble in several oils depended on the structure of polyol esters. The physical properties such as 4-ball wear property and extreme-pressure (EP) properties were characterized by measuring wear scar diameter through ASTM D2266 and by determining the load-carrying through ASTM D2783 method, respectively. As the results, wear scar diameters of oils in which the semi-fluorinated polyol esters were added were not changed compared to those of not added oils. While extreme-pressure properties remarkably Increased with fluorine contents of the esters depended on the structure of acid moiety and polyol moiety. Also, the extreme-pressure property of semi-fluorinated NPG polyol ester in gasoline engine oil was better than that of commercial Teflon coating additive.

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Spray Characteristics of the Air-Shrouded Injectors (공기쉬라우드형 인젝터의 분무 특성 연구)

  • 김기성;박상규
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.4
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    • pp.912-919
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    • 2001
  • Improvement of the atomization characteristics by adopting the air-shrouded injector has been considered as one of the important methods for decreasing HC emissions in SI engines. Thus, in this study to develop air-shrouded injector with a finer spray, atomization characteristics of differ-ent types of commercial air-shrouded injectors were investigated through the spray imaging and the drop size measurements. As a results, it was found that the internal mixing type of air-shroud-ed injector had a good atomization characteristics. But, a number of large droplets were found in the internal mixing type commercial injector, this shortcoming was improved by adopting the thread type air passages in the air nozzle.

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Preparation Technique of Thermostable Foam-Floater for High Temperature Engine Oil (고온 엔진오일용 내열성 발포부표 제조 기술)

  • Kim, Byoung-Sik;Hong, Joo-Hee;Chung, Yongjae;Heo, Kwang-Beom
    • Applied Chemistry for Engineering
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    • v.17 no.1
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    • pp.82-86
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    • 2006
  • When a domestically manufactured floater is used in a general gasoline or LPG car, or a flowmeter is floated long time in the engine oil under above $150^{\circ}C$, the floater will be swelled or its organization will be slackened because weight and volume will be changed due to the osmosis of fuel. In this study, we conducted a research on a manufacturing technique of a foam-floater with the small changse in weight and volume, oil-resistance, and thermal resistance in the high temperature engine oil. When the prepared floater TROF II-3, where Nitrile Butadiene Rubber (NBR) as basic material of the floater was superseded by Hydrogenated Nitrile Butadiene Rubber (HNBR), was floated for 100 h at the engine oil of high temperature ($150^{\circ}C$), the change rates of the weight and the volume were 2.90%, and 2.56%, respectively. These were less than the NBR (TROF I-3) case, where the change rates of the weight and the volume were 10.81% and 3.08%, respectively, Therefore, TROF II-3 was determined to be suitable as an engine-oil floater in high temperature because the change of weight and volume were small, the appearance, and the specific gravity of floater were maintained uniformly in the high temperature.

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
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    • v.19 no.4
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    • pp.121-129
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    • 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.

Study on the Optimal Injection Condition for HC-LNT Catalyst System for Diesel Engines with a Gasoline PFI Type Injector (가솔린 인젝터를 디젤엔진용 HC-LNT 촉매에 적용하기 위한 최적 분사 조건에 관한 연구)

  • Oh, Jung-Mo;Mun, Woong-Ki;Kim, Ki-Bum;Lee, Jin-Ha;Lee, Ki-Hyung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.2
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    • pp.121-127
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    • 2011
  • NOx (Nitrogen Oxide) reduction system periodically needs a rich or stoichiometric operating condition to reduce NOx. A new method that optimizes the control of external HC injection into a diesel exhaust pipe for HC-type LNT (Lean NOx Trap) catalyst system has been developed. In this paper, these catalysts are called HC-LNT catalysts. The concentration and amount of HC can be controlled by controlling the external injection. In this study, we investigated the relationship between the spray behavior of hydrocarbons injected into the transparent exhaust pipe and NOx reduction characteristics. From the results of this experiment, we obtained useful information about the optimum injection and position of HC injector to the exhaust pipe. Further, we obtained useful information about the optimal injection condition for an HC-LNT catalyst system with a gasoline PFI (port fuel injection) typeinjector.

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
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    • v.28 no.1
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    • pp.68-76
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    • 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.