• Title/Summary/Keyword: vehicle exhaust gas

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Research of Natural Gas/Diesel Dual Fuel Vehicle (CRDI시스템을 갖는 천연가스/디젤 혼소차량의 개발에 대한 연구)

  • Lee, Sang-Min;Lim, Ock-Taeck
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.5
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    • pp.13-18
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    • 2012
  • This research is about the exhaust gas and driving performance test which are for CNG-Diesel dual fuel engine. The CNG-Diesel dual fuel engine converted from 2500cc diesel has two steps of injection systems; small amount of diesel is injected to mixture CNG in cylinder to ignite before CNG is injected into each intake manifold to form mixture. The amounts of output power and emission in duel fuel consumption were measured by engine dynamometer and exhaust gas analyzer. Over 90% of diesel consumption reduction, similar driving performance to current diesel engine and reduced emission on $CO_2$ and PM, respectively, were indicated through the measurements. The two steps of system were applied to vehicle to investigate exhaust gas characteristics and driving performance via NEDC mode and real driving test. Additional oxidation catalyst was applied to reduce emission on the test vehicle and the NEDC mode test showed the reduction of Co, $CO_2$, Pm and THC.

A study on engine performance of EGR valve problem in Hybrid vehicles (하이브리드 자동차의 EGR 밸브 오작동 시 엔진 성능에 미치는 영향)

  • Song, Rak Hyun;cho, Haeng Muk
    • Journal of Energy Engineering
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    • v.24 no.3
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    • pp.34-39
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    • 2015
  • Recently, Air pollution is gradually increasing which are coming from the exhaust of the ICE vehicles in the world. ICE vehicle exhaust gas and $CO_2$ are widely suspected of contributing to the called greenhouse effect, fueling fears of global warming. Therefore, many countries are striving to decrease the vehicle exhaust gas and have developed a variety of policies as air pollution regulation plans. To comply with the regulations, automotive industry has developed hybrid vehicles, which have features of both ICE vehicles and electric vehicles. Hybrid car is eco-friendly and has lowered exhausting gases and improved fuel efficiency. This research has been written to show that break down cases with EGR valve in hybrid cars, steadily increasing in use, and to help with on-site maintenance.

Effect of Engine Specification and Driving Conditions on the Idle Emission Characteristics of SI Vehicles (Sl 자동차의 아이들 운전시 엔진 및 운행 조건에 따른 배출 가스 특성)

  • 류재욱;송정훈;이창식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.3
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    • pp.70-76
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    • 2002
  • This study focus on the effect of engine specification, driving conditions and the vehicle type on the idle emission characteristics. In order to obtain the characteristics of exhaust emissions, 1,260 vehicles of spark ignition engine are sampled and investigated. The exhaust emissions are measured with a CO/HC emission gas analyzer. The Sl engine vehicles are investigated by the effect of various exhaust emission parameters such as vehicle milage, engine specification, valve trains and fuels. The results show that the amount of CO and HC emission is not directly related to the driving mileage of the vehicle. However, the engine specifications and fuels such as the type of valve train and piston displacement have influence on the exhaust emissions. In addition, the LPG vehicle emits more CO and HC than gasoline vehicle. Based on the test results of SI vehicles, the influence of excess air and displacement volume are discussed.

LOW FUEL CONSUMPTION AND LOW EMISSIONS - ELECTROMECHANICAL VALVE TRAIN IN VEHICLE OPERATION

  • Pischinger, M.;Salber, W.;Staay, F.V.D.;Baumgarten, H.;Kemper, H.
    • International Journal of Automotive Technology
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    • v.1 no.1
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    • pp.17-25
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    • 2000
  • The electromechanical valve train (EMV) technology allows for a reduction in fuel consumption while operating under a stoichiometric air-fuel-ratio and preserves the ability to use conventional exhaust gas aftertreatment technology with a 3-way-catalyst. Compared with an engine with a camshaft-driven valve train, the variable valve timing concept makes possible an additional optimization of cold start, warm-up and transient operation. In contrast with the conventionally throttled engine, optimized control of load and in-cylinder gas movement can be used for each individual cylinder and engine cycle. A load control strategy using a "Late Intake Valve Open" (LIO) provides a reduction in start-up HC emissions of approximately 60%. Due to reduced wall-wetting, the LIO control strategy improves the transition from start to idle. "Late Exhaust Valve Open" (LEO) timing during the exhaust stroke leads to exhaust gas afterburning and, thereby, results in high exhaust gas temperatures and low HC emissions. Vehicle investigations have demonstrated an improved accuracy of the air-fuel-ratio during transient operation. Results in the New European Driving Cycle have confirmed a reduction in fuel consumption of more than 15% while meeting EURO IV emission limits.

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Exhaust Noise Control with the Active Muffler in Exhaust System of Vehicle (상용차 배기계에서 액티브 머플러를 이용한 배기 소음 제어)

  • 김홍섭;홍진석;오재응;송진호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.1
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    • pp.36-42
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    • 1998
  • In this study, active muffler was designed and was manufactured for exhaust noise reduction of commercial vehicle, then experiment of real vehicle was conducted. In a manufactured active muffler, because the flow of exhaust noise in tail pope outlet are become a plane wave, the global reduction if radiation noise from outlet and the placement of error microphone to avoid the exhaust gas of high temperature could be implemented. In control algorithm, reduction of noise of engine driving frequency and harmonic frequency can be archieved using proposed reference signal including a fixed speed state(2,000rpm, 3,000rpm, 4,000rpm) and a run-up speed state(2,000rpm$\rightarrow$4,000rpm) is accomplished with the active muffler installed in vehicle.

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A Study on the Exhaust Emission of LPG and Gasoline Vehicle (LPG와 가솔린 연료의 차량 배출가스 특성에 대한 비교 연구)

  • 정성환;한상명
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.5
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    • pp.23-28
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    • 2002
  • As the interest on the air pollution is gradually rising up at home and abroad, automotive industries have been working on the exhaust emission reduction from vehicles through a lot of approaches, which consist of new engine design, innovative aftertreatment systems, and using clean fuels. Methanol, ethanol, LNG, LPG, H2, reformulated gasoline are generally recognized as the clean fuel. Since the low price policy of government on LPG has expanded its vehicle market recently, there is concern of the exhaust emission of LPG vehicle. In this paper, we studied the value of LPG fuel as a clean fuel by comparing the results of the exhaust emission from LPG and Gasoline fueled vehicles, and discussed its limitation of LPG vehicle with mixer type as a fuel supply system. FTIR was used to understand the difference of exhaust emission components of LPG and Gasoline fueled vehicles.

An Experimental Study on Individual HC Emission Characteristics and Startability for Various Composition Ratio of LPG Fuel on LPLi Engine (LPLi엔진에서의 LPG 연료 조성비가 개별탄화수소 배출특성과 시동성에 미치는 영향에 대한 연구)

  • Choi, Seong-Won;Kwak, Ho-Chul;Myung, Cha-Lee;Park, Sim-Soo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.31 no.3 s.258
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    • pp.234-241
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    • 2007
  • The regulations for hydrocarbon emission from vehicles have become much more stringent in recent years. These more stringent regulations request vehicle manufacturers to develop the advanced exhaust system for reducing exhaust emissions. The exhaust emissions has many sources in vehicle. In order to investigate the characteristics of hydrocarbon(HC) in the exhaust manifold, concentrations of individual HC species were measured in exhaust process. Using sampling valve, the light hydrocarbon emissions were captured in the exhaust manifold(catalyst before and after) and analyzed from LPLi engine exhaust manifold(catalyst before and after) using different fuel properties. Then exhaust samples were measured by gas chromatography(GC) and exhaust gas analyzer. Catalyst conversion efficiency for fuel properties of Butane 100% was better than Propane 100%. Start delay of LPLi engine was observed as increment of propane contents in LPG fuels.

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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Evaluation of Inner Flow Characteristics of Oxygen Sensor for Vehicle Exhaust System (자동차 배기계용 산소센서 내부유동 특성 평가)

  • Han, Dae-Kwang;Suh, Ho-Cheol;Yee, Jurng-Jae;Kang, Jung-Ho;Han, Seung-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.2
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    • pp.47-54
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    • 2012
  • An oxygen sensor installed in vehicle exhaust systems enables to measure the amount of oxygen in the exhaust gas, in which the measured data are collected and analyzed in ECU(Engine Control Unit). The oxygen sensor is exposed to the high speed exhaust gas at high temperature circumstance, so that protection caps are required not only to protect the susceptible measuring part, but also to provide the real time measurement without time delay. In this study, a new oxygen sensor with one protection cap was proposed, and the CFD analysis was carried out in order to compare the performance characteristics, such as flow speed and ratio of AOA(Age of Air), for the conventional and new oxygen sensor. The numerical results of CFD analysis provided the flow speed of 1.34m/s and the ratio of AOA of 3.43. The similar features obtained from the numerical results showed that the new oxygen sensor guarantees the same performance characteristics of the conventional ones.

Effect of Gas Compositions on Fuel Economy and Exhaust Emissions of Natural Gas Vehicles (연료의 조성변화가 천연가스차량의 연비 및 배출가스 특성에 미치는 영향)

  • 이영재;김강출
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.8
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    • pp.123-131
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    • 1999
  • Natural gas is one of the most promising alternative fuels for automotive vehicles. However, natural gas varies in compositional between the originating fields and may be further modified due to processing and additional mixing. These variations are known to affect engine performance and emissions through changes in fuel metering and combustion characteristics. In the present study, the effect of gas compositions on vehicle performance such as fuel economy, driveability and exhaust emissions was examined. Analysis are made of using 3 types of NGVs which were made by automakers and 6 different fuels which are selected in consideration of the variation in fuel composition on the worldwide market. The results may be utilized to develop natural gas natural gas engine in automaekrs and/or to establish the fuel standard in the refueling stations.

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