• Title/Summary/Keyword: 커먼레일 직접 분사

Search Result 38, Processing Time 0.029 seconds

DME 분과 발표회-(DME 연료실증.시험연구 기술개발)

  • Korea LPGas Industry Association
    • LP가스
    • /
    • v.20 no.2
    • /
    • pp.59-67
    • /
    • 2008
  • 지난 4월 2일 GAS KOREA 2008 전시회가 개최된 서울무역전시장에서 '한국DME협회 분과발표회'가 열렸다. 이날 분과발표회에서는 'DME Demo 플랜트 현황소개(한국가스공사 연구 개발원 조원준 박사 "DME 연료실증, 시험연구 사업현황(한국가스공사 연구개발원 백영순 박사)" 커먼레일형 연료공급계를 탑재한 2리터급 DME 차량개발(자동차 부품연구원 정재우 박사) "급속압축장치를 이용한 불균일 예혼합기의 DME HCCI연소 과정에 관한 연구(울산대학교 임옥택 교수) DME의 자착화 측정 및 세탄가의 추정(인하대학교 이대엽교수)" 직접분사식 압축착화기관에서 DME연료의 분무미립화 및 배출물 특성(한양대학교 이창식 교수)' 에 대한 발표도 이뤄졌다.

  • PDF

Combustion and Emission Characteristics of 4 Cylinder Common-Rail DI Diesel Engine with Biodiesel Blended Fuel (4 실린더 직접분사식 디젤엔진에서 바이오디젤 혼합연료의 연소 및 배기특성)

  • Lee, Dong-Gon;Roh, Hyun-Gu;Choi, Seuk-Cheun;Lee, Chang-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.35 no.2
    • /
    • pp.137-143
    • /
    • 2011
  • This paper describes the effects of biodiesel blended fuel on the engine combustion and emission characteristics in a four cylinder CRDI(Common-rail direct injection) diesel engine. In this work, the biodiesel-diesel blended fuel(20% of biodiesel and 80% of ULSD(ultra low sulfur diesel) by volume ratio, BD20) and ULSD fuel are used under the various injection pressures and engine speeds. The experimental results of BD20 and ULSD fuel show that NOx emissions were increased and soot emissions were decreased with the increase of injection pressure. In particular, NOx emissions were slightly increased for the BD20 fuel, however, soot emissions were significantly reduced compared to the ULSD fuel. When the engine speed is increased from 1000rpm to 2000rpm, NOx emissions are decreased at all tested conditions, and soot emissions are largely increased at lower injection pressure.

Cylinder Pressure based Real-Time IMEP Estimation of Diesel Engines (실린더 압력을 이용한 디젤엔진의 실시간 IMEP 추정)

  • Kim, Do-Hwa;Oh, Byoung-Gul;Ok, Seung-Suk;Lee, Kang-Yoon;SunWoo, Myoung-Ho
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.17 no.2
    • /
    • pp.118-125
    • /
    • 2009
  • Calculation of indicated mean effective pressure(IMEP) requires high cylinder pressure sampling rate and heavy computational load. Because of that, it is difficult to implement in a conventional electronic control unit. In this paper, a cylinder pressure based real-time IMEP estimation method is proposed for controller implementation. Crank angle at 10-bar difference pressure($CA_{DP10}$) and cylinder pressure difference between $60^{\circ}$ ATDC and $60^{\circ}$ BTDC($DP_{deg}$) are used for IMEP estimation. These pressure variables can represent effectively start of combustion(SOC) and fuel injection quantity respectively. The proposed IMEP estimation method is validated by transient engine operation using a common-rail direct injection diesel engine.

Analysis of Hydraulic Characteristics of High Pressure Injector with Piezo Actuator (피에조 액츄에이터 적용 고압 인젝터의 유압 동특성 해석)

  • Lee, Jin-Wook;Min, Kyoung-Doug
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.14 no.4
    • /
    • pp.164-173
    • /
    • 2006
  • In the electro-hydraulic injector for the common rail Diesel fuel injection system, the injection nozzle is being opened and closed by movement of a injector's needle which is balanced by pressure at the nozzle seat and at the needle control chamber, at the opposite end of the needle. In this study, the piezo actuator was considered as a prime movers in high pressure Diesel injector. Namely a piezo-driven Diesel injector, as a new method driven by piezoelectric energy, has been applied with a purpose to develop the analysis model of the piezo actuator to predict the dynamics characteristics of the hydraulic component(injector) by using the AMESim code. Aimed at simulating the hydraulic behavior of the piezo-driven injector, the circuit model has been developed and verified by comparison with the experimental results. As this research results, we found that the input voltage exerted on piezo stack is the dominant factor which affects on the initial needle behavior of piezo-driven injector than the hydraulic force generated by the constant injection pressure. Also we know the piezo-driven injector has more degrees of freedom in controlling the injection rate with the high pressure than a solenoid-driven injector.

Effect of EGR Rate on Combustion and Emission Characteristics in a Single-cylinder Direct Injection Diesel Engine with Common-rail (직접분사식 커먼레일 단기통 디젤엔진에서 EGR율에 따른 연소 및 배기특성)

  • Heo, Jeong-Yun;Cha, June-Pyo;Yoon, Seung-Hyun;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.19 no.2
    • /
    • pp.20-25
    • /
    • 2011
  • The purpose of this work is an experimental investigation of combustion and emission characteristics in DI diesel engine applied high EGR rate as a method of low-temperature combustion. In order to analyze the effect of EGR rate variation, a single-cylinder DI diesel engine was operated under various EGR rate conditions. In addition, injection timing was variously controlled to investigate the effect of injection timing in DI diesel engine using the cooled-EGR system. The NOx emissions were decreased in accordance with the increase of EGR rate. On the contrary, soot emissions were generally increased under applied EGR conditions. However, soot emissions were decreased in a few injection timings under high EGR rate conditions. The EGR results show that the ignition delay were increased by decreased oxygen concentrations in combustion chamber under the high EGR rate.

Comparison Analysis of Dynamic Characteristics of Servo-hydraulic Piezo-driven Injector between 3-way and Bypass-circuit Type (3-way형과 Bypass형 서보유압 피에조 인젝터의 구동특성 비교)

  • Jo, Insu;Jeong, Myoungchul;Lee, Jinwook
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.21 no.5
    • /
    • pp.169-175
    • /
    • 2013
  • CRDi technology of diesel engine was developed from in the early 2000s due to a need to increase fuel efficiency and environment care. Especially, high-pressure fuel injection system in CRDi system which has a fuel injection unit including an injector, a fuel pump and common-rail, etc. becomes possible to make the exhaust gas clean as well as power improvement. In this study, comparison of dynamic characteristics of servo-hydraulic piezo-driven injector with 3-way and bypass-circuit type was analyzed by using the AMESim code. As results of this study, it found the bypass-circuit inside servo-hydraulic piezo injector can cause a faster injection response than that of the 3-way type. Also it was shown that bypass-circuit type had better control capability due to hydraulic bypass system.

Analysis of Sensitivity Characteristics with AMESim Model for Piezo Injector (AMESim기반 피에조 인젝터용 해석모델의 민감도 특성 해석)

  • Jo, Insu;Kwon, Jiwon;Lee, Jinwook
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.21 no.2
    • /
    • pp.17-25
    • /
    • 2013
  • Performance of DI diesel engine with high fuel injection method is directly related to the emission characteristics and fuel consumption. At present, diesel injection system with piezo element is replacing conventional solenoid type due to their faster electro-mechanical properties. In this study, it was investigated the sensitivity characteristics regarding internal hydraulic modeling based on the AMESim environment of piezo-driven injector The analytic parameter for this study defined such as In/Out orifice, injection hole's diameter and driven voltage on piezo stack. As the results, it was shown that these parameter influence on a fast response characteristics of piezo-driven injector. Also we found fuel pressure recovery time is faster about 0.1 ms due to larger IN orifice diameter. And larger OUT orifice diameter occurs maximum pressure drop with faster its timing of about 0.2 ms.

An Experimental Study on the Emission Characteristics of GTL Fuel with Injection Timings in CRDi Single Cylinder Engine (커먼레일 단기통 엔진에서 GTL 연료의 분사시기 변화에 따른 배출물 특성)

  • Kim, Byoung-Jun;Lee, Yong-Gyu;Choi, Kyo-Nam;Jeong, Dong-Soo;Cha, Kyung-Ok
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.16 no.1
    • /
    • pp.181-187
    • /
    • 2008
  • Recently, alternative fuels are drawing more attentions due to the increasing need for lower emission characteristics and fuel consumption rate in automotive engines. The GTL(gas to luquid) is the one of most favored candidates. It has higher cetane number(more than 75) and almost negligible sulphur and aromatic contents. Therefore, enhanced emission characteristics are expected even in the application in diesel engines without any modification. In this study, the cylinder pressure and heat release, emission characteristics with fuel injection timings are compared between diesel and GTL fuel in the single cylinder diesel engine. Noticeable reduction in PM, THC and CO emission are observed due to lower sulphur and aromatic contents in GTL. Also, the ignition delay decreased due to higher cetane number of GTL, which slightly decreased the amount of NOx emissions. With the retards of main injection timing, NOx decreases more for the case of GTL, while the level of THC and CO emissions still remains lower than the case of diesel. Therefore, there is much room for the control of injection timing for NOx reduction without sacrificing THC and CO emissions. With the retards of main injection timing, Small size distribution of PM became lager and there amount increased. But from all conditions, size distribution of PM for the case GTL was lower than Diesel.

Effects of Aromatics and T90 Temperature for High Cetane Number Fuels on Exhaust Emissions in Low-Temperature Diesel Combustion (저온디젤연소에서 고세탄가 연료의 방향족 및 T90 온도가 배기가스에 미치는 영향)

  • Han, Man-Bae
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.35 no.4
    • /
    • pp.371-377
    • /
    • 2011
  • The aim of this study is to investigate the effects of aromatics and T90 temperature for high cetane number (CN) of diesel fuels on combustion and exhaust emissions in low-temperature diesel combustion in a 1.9 L common rail direct injection diesel engine at 1500 rpm and 2.6 bar BMEP. Four sets of fuels with CN 55, aromatic content of 20% or 45% (vol. %), and T90 temperature of $270^{\circ}C$ or $340^{\circ}C$ were tested. Given engine operating conditions, all the fuels showed the same tendency of decrease of PM with an increase of an ignition delay time. At the same ignition delay time, the fuels with high T90 produced higher PM. At the same MFB50% location the amount of NOx was similar for all the fuels. Furthermore, at the same ignition delay time the amounts of THC and CO were similar as well for all the fuels. The amount of THC and CO increased with an extension of the ignition delay time mainly because of the increase of fuel-air over-mixing.

A Study on the Characteristics of Ignition and Combustion, in a Diesel Spray Using Multi-Component Mixed Fuels (다성분 혼합연료를 이용한 디젤분무의 착화연소특성에 관한 연구)

  • Yoon, Jun-Kyu;Lim, Jong-Han
    • Journal of Energy Engineering
    • /
    • v.16 no.3
    • /
    • pp.120-127
    • /
    • 2007
  • The purpose of this study is experimentally to analyze that the fuel mass fractions of multi-component mixed fuels have an effect on the characteristics of spray ignition and combustion under the ambient conditions of diesel combustion fields. The characteristics of ignition and combustion were investigated by chemiluminescence images and direct photography. The experiments were conducted in the RCEM(rapid compression expansion machine) with optical access. Multi-component fuels mixed with i-octane, n-dodecane and n-hexadecane are injected in RCEM by the electronic control of common rail injector. Experimental conditions set up 42, 72 and 112 MPa in injection pressure, 700, 800 and 900 K in ambient gas temperature. The results show that the ignition delay was dependent on high cetane number. In case of low ambient temperature, the more low boiling point fuels were mixed, the lower luminance regime had a remarkable effect and also shortened diffusion combustion by increasing heat release rate.