• Title, Summary, Keyword: Exhaust emissions

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The Experimental Study on Exhaust Emission Characteristics with Oxygen Component Addition in Diesel Engine (디젤기관에서 산소성분 첨가에 의한 배기가스 배출특성의 실험적 연구)

  • Oh, Y.T.;Choi, S.H.;Jang, S.J.
    • Proceedings of the KSME Conference
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    • pp.800-805
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    • 2001
  • Recently, our world is faced with very serious and hard problems related to the air pollution due to the exhaust emissions of the diesel engine. So, lots of researchers have studied to reduce the exhaust emissions which influenced the environment strong. In this paper, the effect of oxygen component in fuel on the exhaust emissions has been investigated for diesel engine. And, we tried to analysis the quantities of the low and high hydrocarbon among the exhaust emissions in diesel engine. It have been investigated by the quantitative analysis of the hydrocarbon $C_1\simC_6$ using the gas chromatography. This study carried out by comparing the chromatogram with diesel fuel and diesel fuel blended DGM(diethylene glycol dimethyl ether) 5%. The results of this study show that the hydrocarbon $C_1\simC_6$ among the exhaust emissions of the mixed fuels are exhausted lower than those of the diesel fuel at the all load and speed. In particular, high boiling point hydrocarbons such as $C_5$ and $C_6$ were reduced remarkably in high speed and load region.

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Modification of Hybrid Diesel Vehicle and Its Effect on the Exhaust Emissions (디젤 하이브리드 차량 개조에 따른 배기 배출물 영향 평가)

  • Kwon, Soonho;Lim, Jongsoon;Lee, Hyunwoo;Lee, Jeonghoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.5
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    • pp.537-544
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    • 2015
  • The effects of the modification of hybrid vehicle components on diesel exhaust emissions were investigated in this study. We examined the changes in exhaust emissions and the fuel consumption (FC) caused by the modification of generator (alternator) and motors. Exhaust emissions such as black carbon (BC), HC, $NO_X$ and $CO_2$ were measured not only in idle state but also on an actual urban road as well as on a chassis dynamometer. BC, $NO_X$ and HC emissions increased by 95%, 27% and 34% respectively when the generator charged the battery in the idle condition. BC and FC decreased in hybrid mode on the actual urban road partly because the motors were used to assist the diesel engine. In addition, the decreases in exhaust emissions and FC were also evident in the hybrid mode when the vehicle was tested on the chassis dynamometer.

A study on the characteristics of fuel performance according to the oxygenated additive type for gasoline fuel Part 2. Exhaust and Non-regulated, PM emission characteristics (휘발유 연료용 함산소 첨가제 종류에 따른 성능 특성 연구 Part 2. 배출가스 및 미규제 물질, 입자상 물질 특성)

  • Lee, Min-Ho;Kim, Ki-Ho;Ha, Jong-Han
    • Journal of the Korean Applied Science and Technology
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    • v.33 no.2
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    • pp.374-384
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    • 2016
  • Concern about air pollution is gradually rising up in domestic and foreign, automotive and fuel researchers are trying to reduce vehicle exhaust emissions, through a lot of approaches, which consist of new engine design and innovative after-treatment systems, using clean (eco-friendly alternative) fuels and fuel quality improvement. This research is proceeding by two main issues : exhaust emissions and PM particle emissions of gasoline vehicle. Exhaust emissions, non-regulated emissions and PM (particulate matter) particles of automotive are causing many problems which ambient pollution and harmful effects on the human body. The main particulate fraction of automotive exhaust emissions consists of small particles. Because of their small size, inhaled particles can easily penetrate deep into the lungs. The rough surfaces of these particles make it easier for them to combine with other toxins in the environment. Thus, the hazards of particle inhalation are increased. Based on the oxygenated fuel additive types (MTBE, Bio-ETBE, Bio-ethanol, Bio-butanol), this paper discussed the influence of oxygen contents on gasoline vehicle exhaust emissions, non-regulated emissions and nano-particle emissions. Also, this paper assessed exhaust emission characteristics at 2 type test modes. The test modes were FTP-75 and HWFET. All measurement items be verified less than the value of regulated emissions. It could be known difference increase and decrease by each measurement item depending on increase the oxygen contents.

A Study on the Effect of Recirculated Exhaust Gas with Scrubber EGR System upon Exhaust Emissions in Diesel Engines (디젤기관의 배기 배출물에 미치는 스크러버형 EGR 시스템 재순환 배기의 영향에 관한 연구)

  • Bae, Myung-Whan;Ha, Jung-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.9
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    • pp.1247-1254
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    • 2000
  • The effects of recirculated exhaust gas on the characteristics of $NO_x$ and soot emissions under a wide range of engine load have been experimentally investigated by a water-cooled, four-cylinder, indirect injection, four cycle and marine diesel engine operating at two kinds of engine speeds. The simultaneous control of $NO_x$ and soot emissions in diesel engines is targeted in this study. The EGR system is used to reduce $NO_x$ emissions, and a novel diesel soot removal device with a cylinder-type scrubber for the experiment system which has 6 water injectors(A water injector has 144 nozzles in 1.0 mm diameter) is specially designed and manufactured to reduce the soot contents in the recirculated exhaust gas to intake system of the engines. The intake oxygen concentration and the mean equivalence ratio calculated by the intake air flow and fuel consumption rate, and the exhaust oxygen concentration measured are used to analyse and discuss the influences of EGR rate on $NO_x$ and soot emissions. The experiments are performed at the fixed fuel injection timing of $15.3^{\circ}$ BTDC regardless of experimental conditions. It is found that $NO_x$ emissions are decreased and soot emissions are increased owing to the drop of intake oxygen concentration and exhaust oxygen concentration, and the rise of equivalence ratio as the EGR rate rises.

Effect of Exhaust Heat Exchanger on Catalytic Converter Temperature in an SI Engine (가솔린 엔진의 배기 열교환기가 촉매 온도에 미치는 영향에 관한 연구)

  • 이석환;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.2
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    • pp.9-16
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    • 2004
  • Close-coupled catalyst (CCC) can reduce the engine cold-start emissions by utilizing the energy in the exhaust gas. However, in case the engine is operated at high engine speed and load condition, the catalytic converter may be damaged and eventually deactivated by thermal aging. Excess fuel is sometimes supplied intentionally to lower the exhaust gas temperature avoiding the thermal aging. This sacrifices the fuel economy and exhaust emissions. This paper describes the results of an exhaust heat exchanger to lower the exhaust gas temperature mainly under high load conditions. The heat exchanger was installed between the exhaust manifold and the inlet of close-coupled catalytic converter. The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high load conditions. However, the cooling of the exhaust gas through the heat exchanger may cause the deterioration of exhaust emissions at cold start due to the increment of catalyst light-off time.

SI Engine Hydrocarbon Emissions Reduction with Secondary Air Injection and Coolant Control (2차 공기분사 및 냉각수제어에 의한 SI 엔진의 탄화수소 배기저감)

  • 박기수;조영진;박심수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.4
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    • pp.51-58
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    • 2000
  • It is well known that the majority of the emissions measured from vehicle exhaust in the US Federal Test Procedure(FTP-75) are emitted during the first 60 seconds. This paper describes an experimental study on SI engine emissions reduction after cold start with interval secondary air injection and coolant control. Secondary air injection after cold start to reduce exhaust emissions causes an exothermic reaction at the exhaust port and gives sufficient air to the catalyst. For that reason engine-out emissions oxidized in the exhaust port and the rapid heating of a catalytic converter after cold start with CSAI and ISAI are estimated. The influence of the coolant temperature on SI engine emissions has been estimated. In the present studycoolant control of the cylinder head tempeature is used to investigate the effect of coolant temperature on SI engine emissions. The results show that engine-out hydrocarbon and carbon monoxide emissions are considerably reduced with interval secondary air injection and coolant control.

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An Effect of Operating Conditions on Exhaust Emissions in a Small Turbocharged D.I. Engine (직접 분사식 소형 과급 디젤엔진의 운전조건이 배기 배출물에 미치는 영향)

  • Jang, S.H.;Koh, D.K.;Ahn, S.K.
    • Journal of Power System Engineering
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    • v.6 no.2
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    • pp.12-17
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    • 2002
  • Recently, the world is faced with very serious problems related to the air pollution due to the exhaust emissions of the diesel engine. So, many of researchers have studied to reduce the exhaust emissions of diesel engine. This study was investigated for various exhaust emissions according to operating conditions in a turbocharged D.I. diesel engine. As a result of experiments in a test engine, the $CO_2\;and\;NO_x$ increased with increasing load, the $CO_2$ and CO decreased with increasing charge air pressure in manifold, the CO decreased with increasing cooling fresh water temperature, and the $NO_x$ decreased with worming cooling fresh water before engine start.

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Effect of Cooled-EGR on the Characteristics of Performance and Exhaust in a HCCI Diesel Engine (균일 예혼합 압축 착화 디젤 엔진의 성능 및 배출물 특성에 미치는 Cooled-EGR 효과)

  • Lee, Chang-Sik;Yoon, Young-Hoon;Kim, Myung-Yoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.5
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    • pp.35-41
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    • 2005
  • The effects of cooled-ECR on the characteristics of combustion and exhaust emissions were investigated in a single cylinder HCCI diesel engine The premixed charge (gasoline or diesel) was obtained with premixing chamber and high-pressure (5.5MPa) injection system. Exhaust pressure control and cooled ECR system were used in order to reduce pressure fluctuation and to mix the exhaust gas well with the fresh intake air. The experimental results show that NOx emissions from conventional diesel engine are steeply decreased by HCCI diesel combustion with cooled-EGR in both case of gasoline and diesel premixing. But soot emissions are rapidly increased with the increase of ECR rate. The recycled exhaust gas increased the ignition delay of mixture and decreased maximum combustion pressure. HC and CO emissions of HCCI combustion are increased with ECR rate.

A Study on Effect of Environmental Characteristics by Intake Mixture Temperature in Scrubber EGR System Diesel Engines

  • Bae, Myung-Whan;Ryu, Chang-Sung
    • Proceedings of the Korean Society Of Semiconductor Equipment Technology
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    • pp.100-111
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    • 2002
  • The effects of intake mixture temperature on performance and exhaust emissions under four kinds of engine loads were experimentally investigated by using a four-cycle, four-cylinder, swirl chamber type, water-cooled diesel engine with scrubber EGR system operating at three kinds of engine speeds. The purpose of this study is to develop the scrubber exhaust gas recirculation(EGR) control system for reducing $NO_x$ and soot emissions simultaneously in diesel engines. The EGR system is used to reduce $NO_x$ emissions. And a novel diesel soot-removal device of cylinder-type scrubber with five water injection nozzles is specially designed and manufactured to reduce soot contents in the recirculated exhaust gas to the intake system of the engine. The influences of cooled EGR and water injection, however, would be included within those of scrubber EGR system. In order to survey the effect of intake mixture temperature on performance and exhaust emissions, the intake mixtures of fresh air and recirculated exhaust gas are heated by a heating device with five heating coils made of a steel drum. It is found that the specific fuel consumption rate is considerably elevated by the increase of intake mixture temperature, and that $NO_x$ emissions are markedly decreased as EGR rates are increased and intake mixture temperature is dropped, while soot emissions are increased with increasing EGR rates and intake mixture temperature. Thus one can conclude that the performance and exhaust emissions are considerably influenced by the cooled EGR.

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The Characteristics of Exhaust Emissions by using Oxygenated Fuels and EGR in IDI Diesel Engine (함산소연료(Diglyme, DEE)와 EGR 방법을 이용한 간접분사식 디젤기관의 배기가스 배출 특성)

  • 유경현;오영택
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.6
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    • pp.108-116
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    • 2002
  • The diesel engine is one of the most effective transport options available in all sizes and covering a wide range of applications. But, many researchers developing the diesel engine are facing tough challenges in view of the increasingly lower emissions standards. Thus, this study will explore the possible fuel additive technology to further reduce the emissions from the IDI diesel engine. The purpose of this study is to investigate the effects of oxygenated fuels on the exhaust emissions and to attain a better trade-off relation between smoke and NOx in four cylinder diesel engine. Experiments were conducted with oxygenated fuels as an effective way to improve the combustion efficiency. Some of oxygenated fuel(Diglyme and DEE) were added to the conventional diesel fuel which had no an oxygen content. Also, EGR was adopted for reducing NOx without any strong adverse effects on other exhaust emissions. This study concluded that exhaust emissions in diesel engine could be reduced by adding the oxygenated fuels which had lower boiling point, and the combustion efficiency was also improved as the oxygen content in fuel increased.