• 제목/요약/키워드: 소형디젤자동차

검색결과 32건 처리시간 0.024초

직접분사식 소형 디젤엔진의 3D 유동특성 및 분절형 스틸 단조 피스톤의 최적화에 관한 연구 (A Study on the Optimization of Articulated Steel Forging Piston and 3D Analysis of Fluid Characteristics for Light Duty DI Diesel Engine)

  • 김현철;박종호
    • 한국자동차공학회논문집
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    • 제12권5호
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    • pp.25-31
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    • 2004
  • In order to prepare for the large power diesel vehicle, the current trend of advanced nations is to shift from the aluminum alloy piston to the steel piston. In this research, a steel forging piston which replaces the aluminum alloy piston is developed to improve the power performance of the diesel engine. The three dimensional flow and combustion analysis of the target engine is conducted. Using the result of the analysis, the piston is optimized, and a prototype of the articulated steel forging piston is built. The reliability of the piston has been evaluated through durability test using a Hydropuls Test Machine for 300,000 km.

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.

PEMS를 이용한 실제도로 주행 배출가스 측정 데이터 분석방법 (Data Evaluation Methods for Real Driving Emissions using Portable Emissions Measurement System(PEMS))

  • 권석주;권상일;이종태;옥선일;서영호;박성욱;전문수
    • 대한기계학회논문집B
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    • 제39권12호
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    • pp.965-973
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    • 2015
  • PEMS(Portable Emissions Measurement System)를 이용한 배기가스 시험절차는 소형 디젤자동차의 실제도로 배출가스를 효과적으로 제어하기 위한 수단으로 최근에 많은 주목을 받고 있으며, 현재의 배기가스 인증규제 시험절차의 제도적 보완장치로 2017년에 한국과 유럽에서 시행될 예정이다. 본 연구에서는 국내에 운행 중인 유로 5 소형 디젤자동차 4대에 대한 실제도로 NOx 배출량을 도심, 교외 및 자동차 전용도로에서 측정하였으며, 측정 결과를 이동평균구간 및 가중평균 배출량 방법으로 분석하였다. 시험 차량 및 주행경로에 대한 두 방법의 실제도로 NOx 배출량 분석결과는 유사한 경향을 갖는 것으로 나타났으며, 이동평균구간 분석방법의 경우 배출 허용기준을 1.8 ~ 8.5배, 가중평균 배출량은 허용기준을 2.0 ~ 10.6배 초과하는 것으로 분석되었다. 본 결과를 바탕으로 실도로 주행 조건에서 NOx 배출량 분석에 대한 기술적 토대를 확보하였고, 향후 배출가스 관리를 위한 정책적 기반 데이터로 활용가능하다.

디젤자동차 용 소형 브라운가스 발생장치의 개발을 위한 가스 생성 특성에 관한 연구 (A Study on the Gas Generative Properties for the Developments of Small Brown Gas Generation Equipments Usable in Diesel Cars)

  • 김주회;안형환
    • 한국가스학회지
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    • 제20권5호
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    • pp.34-39
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    • 2016
  • 디젤자동차용 소형브라운가스 생성 장치의 개발을 위하여 전극 셀의 재료로서 SuS와 Ni 및 Ag기반 셀을 제조하고 셀의 면적과 전해질의 농도 및 전류의 세기를 변화시켜 브라운가스 생성특성을 실험적으로 분석하였다. 전기분해 반응기는 셀의 표면적 및 전극 -극과 +극 배치를 다르게 하여 SMT30, SMT50, SMT50-1, SMT70, SMT90로 제조하였다. 이 때 각 반응기의 따른 브라운가스 생성특성은 셀의 접촉 면적이 클수록 생성특성이 증가하는 경향을 보였으며 전극배치의 경우는 같은 전극면적에서도 극의 배치 따라 차이가 있는 것을 보였다. 또한 전해질의 농도에 대한 영향은 NaOH를 1~3‰로 변화시켰을 때 농도가 적을수록 생성특성이 증가하였고, 전류의 세기의 따른 생성특성은 SMT30, SMT50, SMT50-1, SMT70, SMT90에서 각각 $0.74{\ell}/10min$, $1.0{\ell}/10min$, $1.10{\ell}/10min$, $0.97{\ell}/10min$, $1.13{\ell}/10min$가 얻어졌다.

NIMONIC 86 소재의 소형 선박디젤엔진 배기밸브 적용에 관한 비교 해석 (Comparative Analysis on Application of Exhaust Valve of Small-sized Marine Diesel Engine for NIMONIC 86 Material)

  • 양영준
    • 한국산업융합학회 논문집
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    • 제26권3호
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    • pp.411-419
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    • 2023
  • In this paper, NIMONIC 86 material was tried to apply to exhaust valve for small-sized marine diesel engine. The both structural stability and thermal resistance in high temperature were needed to use the NIMONIC 86 material as exhaust valve for small-sized marine diesel eng ine. The purpose of this study is to investig ate the application of NIMONIC 86 material to exhaust valve of small-sized marine diesel engine by comparing, respectively, SUH 3 and STS 316 materials. As the results, NIMONIC 86 material has intermediate characteristics between SUH 3 and STS 316 materials in terms of the strength in condition of room temperature. Further NIMONIC 86 material was evaluated to have better characteristics than SUH 3 and STS 316 materials in terms of the thermal conductivity.

소형디젤기관의 연료분사조건에 따른 연소 및 미세입자 배출 특성에 관한 연구 (The Effect of Fuel Injection Strategy on Combustion and Nano-particle Emissions in a Small Diesel Engine)

  • 강석호;이성욱;엄동섭
    • 한국자동차공학회논문집
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    • 제22권7호
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    • pp.98-106
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    • 2014
  • Emission standards for passenger diesel engines are becoming more and more stringent. Especially, Europe started the regulation of nano-particles from 2011 with EURO 5b. The objective of this study is to investigate the effect of fuel injection strategy on combustion and nano-particle emission in a small diesel engine. In this study, we conducted combustion analysis and measured both the weight of PM and number of nano-particels. At first, the optimum injection timing was determined with fixed engine operating conditions, such as engine speed, load, and fuel injection quantity. After that, the injection timing was controlled, and the effect of pilot injection was investigated. The number of nano-particles increased as engine load decreases, and it increased up to 10 times depending on the change of injection timing. The weight of PM emissions was increased at low load, and the PM emissions increased with increasing the number of pilot injections.

소형승합차량 및 RV차량의 휘발성 유기 화합물 배출특성 변화에 관한 연구 (A Study on the VOCs Emission Characteristics by the Light Duty Diesel and LPG Fueled Vehicles)

  • 엄명도;류정호;한종수;유영숙;김대욱;김종춘
    • 한국자동차공학회논문집
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    • 제16권1호
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    • pp.8-13
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    • 2008
  • Emissions from automobiles have long been considered a prime source of pollutants involved in smog formation and ozone production. Especially VOCs are associated with serious environmental problems such as photo-chemical smog as well as human health effects. Since motor vehicles are a major source of VOCs, estimating of emission from mobile source is the most important factor to control VOCs. VOCs are emitted from various pollution like motor vehicles, mobile and stationary source that has characteristics of toxicity, cancer-causing, bio-accumulation, durability in air and diffusion can exert a bad influence upon human health and environment. However we don't have any standard or regulation about VOCs emissions. This study is summarized as VOCs emission characteristics from in-use light-duty diesel and LPG fueled vehicles. The vehicle exhaust-gas test mode is CVS cycle and nier-10 cycles that developed on EPA and National Institute of Environmental Research. TO-14 method (Toxic Organic) was chosen for VOCs analysis from EPA in USA. This study results will be useful when make a emission factor and rule making of emission standard about domestic VOCs emission for the improve to air condition.

Cu-SCR 촉매의 De-NOx 성능 향상을 위한 연구 (Research for Performance Improvement of De-NOx of Cu-SCR Catalysts)

  • 서충길
    • 한국산학기술학회논문지
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    • 제19권3호
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    • pp.112-118
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    • 2018
  • 화석연료를 기반으로 하는 내연기관의 엄격한 배기가스규제를 충족시키기 위해 자동차와 선박용 후처리장치의 비중이 점차로 증가하고 있다. 디젤엔진은 $CO_2$ 배출량이 적고 강력한 파워와 연료의 경제성을 가지고 있으며, 상용차뿐만 아니라 승용차에서도 시장의 수요가 증가하고 있다. 디젤 연료 특성으로 인하여 질소산화물은 국부적인 고온연소 영역에서 생성되며, 입자상물질은 확산연소 영역에서 생성이 된다. LNT와 urea-SCR 촉매는 디젤엔진에서 NOx를 저감시키기 위한 후처리장치로 개발되어져왔다. 이 연구는 가혹해지고 있는 배기가스 규제 대응을 위해 소형과 중 대형 디젤기관에 많이 사용되고 있는 Cu SCR 촉매의 NOx 저감 성능 향상을 목적으로 한다. $5Cu-2ZrO_2$/Zeolyst(Si/Al=13.7)SCR 촉매는 $5Cu-2ZrO_2$/93Zeolite(Si/Al=2.9) 촉매에 비해 촉매온도 $300^{\circ}C$ 이상에서 약 5-50% 수준으로 de-NOx 성능이 높았다. Zeolite는 zeolyst에 비해 금속의 분산도가 낮고 평균 입경이 커짐에 따라 촉매의 반응속도가 저하되었다. 10wt% Cu가 담지된 $10Cu-2ZrO_2$/88Zeolyst 촉매는 $200^{\circ}C$에서 40%, $350^{\circ}C$에서 약 65%로 NOx 정화성능이 가장 높았고, Cu의 이온이 제올라이트의 결정화합물인 Al과의 이온교환율이 증가함에 따라 다른 촉매에 비해 20-40% de-NOx 성능이 향상되었다.

Cooled EGR 시스템의 EGR률과 연료분사시기가 소형 디젤엔진의 배기 배출물 특성에 미치는 영향에 관한 연구 (Effect of EGR Rate and Injection Timing on the Characteristics of Exhaust Emissions in Light-duty Diesel Engine)

  • 공호정;황인구;고아현;명차리;박심수;임창식
    • 한국자동차공학회논문집
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    • 제20권3호
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    • pp.7-12
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    • 2012
  • Cooled EGR system is widely used to reduce NOx emissions in diesel engine. But when EGR rate was increased, combustion stability was worsened and PM level was increased. So determining optimized control point of EGR rate is important. In order to determine this point, it is important to figure out the effect of EGR system on the exhaust emissions. In this research, NOx and PM emissions were analyzed with various coolant temperature supplied to the EGR cooler at several positions such as downstream of turbocharger, upstream and downstream of DPF. Effects of some variables such as EGR rate, hot / cooled EGR and change of injection timing were estimated. And $CO_2$ emissions were measured at exhaust and intake manifold to calculate EGR rate at each engine operating condition. Also combustion analysis was performed in each engine operating conditions. In the result of this study, there was trade-off between NOx emissions and PM emissions. When EGR rate was increased, combustion pressure was decreased and COV of IMEP was increased.

실험계획법을 이용한 고효율 소형 열병합 시스템 성능 해석 (Performance Analysis of High Efficiency Co-generation System Using the Experimental Design Method)

  • 류미라;이준식;박정호;이성범;이대희
    • 한국자동차공학회논문집
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    • 제20권3호
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    • pp.20-25
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    • 2012
  • As a kind of distributed energy system, the co-generation system based Diesel engine using after-treatment device was devised for its environmental friendly and economic qualities. It is utilized in that the electric power is produced by the generator connected to the Diesel engine, and waste heat is recovered from both the exhaust gases and the engine itself by the finned tube and shell & tube heat exchangers. An after-treatment device composed ceramic heater and DOC(Diesel Oxidation Catalyst) is installed at the engine outlet in order to completely reignite the unburned fuel from the Diesel engine. In this study, mutual relation of each experimental condition was derived through minimum number of experiment using Taguchi Design and ANOVA recently used in the various fields. It is found that the total efficiency (thermal efficiency plus electric power generation efficiency) of this system reaches maximum 94.4% which is approximately higher than that of the typical diesel engine exhaust heat recovery system.