• 제목/요약/키워드: EGR system

검색결과 185건 처리시간 0.021초

직접분사식 디젤기관에서 EGR 적용시의 배기배출특성에 관한 연구 (A Study on the Exhaust Emission Characteristics with EGR Application in a DI Diesel Engine)

  • 최승훈;오영택;권규식
    • 동력기계공학회지
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    • 제9권3호
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    • pp.10-14
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    • 2005
  • The Effects of cooled and hot EGR(exhaust gas recirculation) on the characteristics of smoke and NOx emission have been investigated using a single cylinder, water-cooled, four cycle, DI diesel engine at several loads and speeds. In this study, a manually controlled EGR system was installed on a agricultural diesel engine which was operated at various operating system. And, the effects of hot EGR and cooled EGR on smoke and NOx emission were compared. The results showed that cooled EGR method was more effective than hot EGR method on smoke and NOx emission.

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

  • Bae, Myung-Whan;Ryu, Chang-Sung
    • 한국반도체및디스플레이장비학회:학술대회논문집
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    • 한국반도체및디스플레이장비학회 2002년도 추계학술대회 발표 논문집
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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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대형디젤기관의 EGR에 의한 배기가스변화에 관한 실험적 연구 (An Experimental Study on Exhaust Gas Change of a Heavy-Duty Diesel Engine by EGR)

  • 오용석;문병철;한영출
    • 한국자동차공학회논문집
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    • 제10권6호
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    • pp.59-64
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    • 2002
  • The effects of EGR on emissions were investigated by using a six-cylinder, 8 litre, turbo-charged, heavy-duty diesel engine with a low pressure route EGR system. The experiments were performed at various engine loads while the EGR rates were set from 0% to 30%. Hot and cooled EGR are achieved without cooling and with cooling respectively. To verify the possibility of EGR technology for the applications, test were performed with steady state test cycle. It was found that the exhaust emissions with the EGR system resulted in a very large reduction in oxides of nitrogen at the expense of higher smoke and PM emissions. Increasing the EGR rate leads to deteriorating specific fuel consumption and power at lower speed and higher load. Also, the reduction rates of NOx emissions for hot and cooled EGR are similar.

딤플 튜브형 EGR Cooler 구조건전성 및 열효율 평가 (Evaluation of Structural Integrity and Heat Exchange Efficiency for Dimpled Tube Type EGR Cooler)

  • 서영호;이현민;박중원;구태완;김정;강범수
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회A
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    • pp.554-559
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    • 2008
  • Most of vehicle manufacturers have applied exhaust gas recirculation (EGR) system to the development of diesel engines in order to obtain the high thermal efficiency without $NO_X$ and Particulate Matter (PM) emitted from the engine. EGR system, which reflow a cooled exhaust gas from vehicles burning diesel as fuel to a combustion chamber of engine, has been used to solve this problem. In order to confirm the safety of the EGR system, finite element analysis was carried out. The safety of EGR system against temperature variation in the shell and tubes was evaluated through the thermal and structural analysis, and the modal analysis using ANSYS was also performed. Finally, the performance of EGR system was verified through the experiment and numerical simulation using effectiveness-NTU method. Program for the estimation of the heat exchange efficiency of the EGR system with regard to the dimpled tube shape was developed.

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가솔린엔진에서 흡기관 압력을 이용한 EGR율의 추정 및 제어 방법에 관한 유용성 연구 (An usefulness study on estimation and control method of EGR ratio using intake manifold pressure in an gasoline engine)

  • 박형선;윤준규
    • Journal of Advanced Marine Engineering and Technology
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    • 제38권7호
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    • pp.806-813
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    • 2014
  • 가솔린엔진에서 흡기계를 통하여 배기가스의 일부를 재연소시키는 EGR시스템은 NOx를 저감하기 위하여 양호한 배기배출특성을 나타내지만, 엔진으로 유입되는 배기가스량이 적절하지 않을 경우 불안정한 연소를 일으켜 엔진의 출력이 저하된다. 본 연구에서는 흡기관압력을 바탕으로 다양한 엔진운전조건에 따른 EGR율을 예측하는 방법을 검토하고, 이러한 예측자료를 실험적 방법을 통하여 확인하였다. 그리고 이러한 예측자료를 바탕으로 피드백 EGR제어 알고리즘을 구성한 후, 엔진운전조건에 대한 잔류 가스량을 계산한 데이터와 EGR 피드백 제어실험을 통해 얻어진 데이터를 비교한 결과를 통하여 정성적으로 유사한 결과치를 얻었다. 따라서 적용된 피드백 EGR제어 알고리즘 및 시스템은 실제 전자제어식 EGR기술에 응용될 실현 가능성을 보여주었다.

고효율 Oval형 EGR 쿨러 개발에 관한 연구 (A Study on Development of Oval Type High Efficient EGR Cooler)

  • 이준;문전일;한창석
    • 한국자동차공학회논문집
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    • 제19권1호
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    • pp.89-94
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    • 2011
  • The EGR system is one of important components in diesel engine. The regulation on NOx emission has been tightened up. Therefore, it is a significant issue to develop and commercialize the high efficient EGR cooler system that reduces NOx emission in DI diesel engine. Key performance factor of the EGR cooler system is how to properly design both wavy cooling fins and gas tubes. This paper proposes a high efficient EGR cooler that has been upgraded with both the optimized wavy cooling fins and the improved shape of structure. The evaluation of the heat exchange efficiency, outlet temperature, and gas pressure drop of the EGR cooler is performed with the prototype of the proposed EGR cooler. The result shows a good solution and will be implemented to the model of a clean diesel engine being developed for both domestic and overseas market.

디젤 엔진의 연비 향상을 위한 저압 배기재순환 시스템의 적용에 관한 연구 (Improvement of Fuel Economy in a Diesel Engine by Application of Low Pressure EGR System)

  • 김용래;이용규
    • 한국추진공학회지
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    • 제19권2호
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    • pp.81-87
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    • 2015
  • 디젤 엔진에서 저압 배기재순환 시스템의 적용을 통한 질소산화물 저감과 연비 향상에 관한 효과를 확인하였다. 엔진의 정상 상태 및 과도 상태에서 시험이 진행되었으며, 차량상사를 통한 NEDC 모드 테스트를 위하여 별도의 제어로직도 개발되었다. 정상 상태의 시험결과에서 저압 배기재순환 시스템은 고압 배기재순환 시스템에 비하여 질소산화물 저감 및 연비 향상에 유리함을 확인하였고, NEDC 모드 테스트 결과로부터 배출가스의 증가없이 연비를 향상시킬 수 있는 것으로 나타났다.

소형 디젤엔진용 E-EGR밸브 개발에 관한 실험적 연구 (An Experimental Study on the Development of E-EGR Valve for Light Duty Diesel Engine)

  • 송창훈;우세종;이진욱;정용일;차경옥
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 추계학술대회논문집B
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    • pp.928-933
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    • 2001
  • EGR(Exhaust Gas Recirculation) is an effective strategy to control nitrogen oxides emissions from diesel engine. The EGR reduces $NO_x$ through lowering the oxygen concentration in the combustion chamber as well as through heat absorption. However, application of EGR system is difficult because of the penalty in fuel consumption and the increase in particulate matter. The engine used for the experimental was a 3-cylinder 0.8-liter turbo-charged light duty diesel engine with an electronic EGR valve. In this study, experiments were performed at variable vehicle speeds and loads on the chassis dynamometer. To evaluate the exhaust emissions with the EGR system testing was performed using cvs-75 mode test procedure. Results of the cvs-75 mode test achieve sufficiently to meet EURO3 standards.

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소형 디젤 엔진용 배기 재순환용 전자식 밸브에 관한 연구 (A Study on the Electronic-ECR Valve for Light Duty Diesel Engine)

  • 송창훈;이민호;정용일;차경옥
    • 한국자동차공학회논문집
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    • 제11권4호
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    • pp.37-43
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    • 2003
  • The exhaust gas recirculation (EGR) is needed for one of various strategies to reduce NOx emission. But to get the proper EGR rate, the intake and exhaust system become complicated, also application of EGR system is difficult because of the penalty in fuel consumption and the increase in particulate matter. This study is focused on the development of EGR valve using the electrical method. The effects of EGR on the characteristics of NOx, CO, CO2 emissions and particulate mater have been investigated using small-displacement size 0.8-liters engine of diesel passenger car operating at several loads and speeds. After the analysis and comparison between conventional E-EGR valve and developed E-EGR valve performance by test bench, the estimation of vehicle application was executed through the EGR map and CVS-75 test result measured on the chassis dynamometer.

A Study on Effect of Intake Mixture Temperature upon Fuel Economy and Exhaust Emissions in Diesel Engines with a Scrubber EGR System

  • Bae, Myung--Whan;Ryu, Chang-Seong;Yoshihiro Mochimaru;Jeon, Hyo-Joong
    • Journal of Advanced Marine Engineering and Technology
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    • 제28권2호
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    • pp.315-331
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    • 2004
  • 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 $\textrm{NO}_{x}$ and soot emissions simultaneously in diesel engines. The EGR system is used to reduce $\textrm{NO}_{x}$ 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 effects of cooled EGR and moisture on $\textrm{NO}_{x}$ and soot emissions. the intake mixtures of fresh air and recirculated exhaust gas are heated up using a heater with five heating coils equipped in a steel drum. It is found that intake and exhaust oxygen concentrations are decreased, especially at higher loads. as EGR rate and intake mixture temperature are increased at the same conditions of engine speed and load. and that $\textrm{NO}_{x}$ emissions are decreased. while soot emissions are increased owing to the decrease in intake and exhaust oxygen concentrations and the increase in equivalence ratio. Thus ond can conclude that $\textrm{NO}_{x}$ and soot emissions are considerably influenced by the cooled EGR.