• Title/Summary/Keyword: Homogeneous Charge Compression Ignition

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EXPERIMENTAL STUDY ON HOMOGENEOUS CHARGE COMPRESSION IGNITION ENGINE OPERATION WITH EXHAUST GAS RECIRCULATION

  • Choi, G.H.;Han, S.B.;Dibble, R.W.
    • International Journal of Automotive Technology
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    • v.5 no.3
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    • pp.195-200
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    • 2004
  • This paper is concerned with the Homogeneous Charge Compression Ignition (HCCI) engine as a new concept in engines and a power source for future automotive applications. Essentially a combination of spark ignition and compression ignition engines, the HCCI engine exhibits low NOx and Particulate Matter (PM) emissions as well as high efficiency under part load. The objective of this research is to determine the effects of Exhaust Gas Recirculation (EGR) rate on the combustion processes of HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine, and a heating device was installed to raise the temperature of the intake air and also to make it more consistent. In addition, a pressure sensor was inserted into each of the cylinders to investigate the differences in characteristics among the cylinders.

A Study on Engine Performance Characteristics of a Homogeneous Charge Compression Ignition(HCCI) Engine According to Exhaust Gas Recirculation(EGR) (EGR(배기재순환)에 따른 HCCI (균질혼합압축착화)기관의 엔진성능특성에 관한 연구)

  • Choi, Gyeung-Ho;Han, Sung-Bin;Dibble, Robert W.
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.28 no.7
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    • pp.857-862
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    • 2004
  • HCCI engines take advantage of high compression ratio and heat release rate, they exhibit high efficiency in compression ignition engines. HCCI engines also utilize a lean air/fuel ratio resulting in low emissions of NOx and particulate matter(PM). The objective of this research is to determine the effects of EGR rate on the combustion processes of HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine, and a heating device was installed to raise the temperature of the intake air and also to make it more consistent. In addition, a pressure sensor was inserted into each of the cylinders to investigate the differences in characteristics among the cylinders.

Combustion and Emission Characteristics of Premixed Charge Compression Ignition Diesel Engine (예혼합 압축 착화 디젤 엔진의 연소 및 배기 특성)

  • Heo, Seong-Geun;Kim, Dac-Sik;Lee, Chang-Sik
    • 한국연소학회:학술대회논문집
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    • 2001.06a
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    • pp.187-192
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    • 2001
  • A homogeneous premixed charge compression ignition engine is experimentally investigated for the reduction of exhaust emissions in diesel engines. In this study, the premixed fuel is injected into the intake manifold to form homogeneous pre-mixture in the combustion chamber and then this pre-mixture is ignited by small amount of diesel fuel directly injected into the cylinder. In the premixed charge compression ignition engine, NOx and smoke concentration of the exhaust emissions were reduced simultaneously as compared with the conventional diesel engine. But HC and CO emissions were increased with the increase of premixed ratio. The combustion characteristics of premixed charged diesel engine such as the power output, the rate of heat release, and the other characteristics are discussed.

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A Study on Exhaust Gas Recirculation of Homogeneous Charge Compression Ignition Engine (균질혼합압축점화기관의 배기가스재순환 특성에 관한 연구)

  • Han, Sung-Bin;Kim, Sung-Mo
    • Journal of Energy Engineering
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    • v.18 no.3
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    • pp.163-168
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    • 2009
  • This paper describes the homogeneous charge compression ignition (HCCI) engine for a new concept. HCCI engines are being considered as a future alternative for diesel and gasoline engines. HCCI engines have the potential for high indicated thermal efficiency under part load and very low NOx emissions. The objective of this paper is to clear the effects of exhaust gas recirculation (EGR) rate on the HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine This work has been run with propane and butane fuels at a constant speed.

A Study on the Characteristics of n-Butane for a Homogeneous Charge Compression Ignition Engine (균질혼합압축점화기관에서 n-부탄 연료의 특성에 관한 연구)

  • HAN, SUNG BIN;PARK, JUN YOUNG;CHUNG, YON JONG
    • Transactions of the Korean hydrogen and new energy society
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    • v.27 no.5
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    • pp.604-611
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    • 2016
  • This paper describes the characteristics of n-Butane fuel for the homogeneous charge compression ignition (HCCI) engine for a new concept. HCCI engines are being considered as a future alternative for diesel and gasoline engines. From the experimental observations, the effect of n-Butane fuel in HCCI engine on CO, HC and NOx are analysed. The objective of this paper is to clear the effects of equivalence ratio and inlet temperature with n-Butane on the HCCI. For this purpose, a 4-cylinder, compression ignition engine was converted into a HCCI engine This work has been run with n-butane fuel at a constant speed.

Combustion Characteristics of Premixed Charge Compression Ignition Diesel Engine with EGR System (EGR율에 따른 예혼합 압축 착화 디젤 엔진의 연소 특성)

  • 이창식;이기형;김대식;허성근
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.66-72
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    • 2002
  • A premixed charge compression ignition engine is experimentally investigated for the reduction of NOx and smoke emissions from diesel engines. In this study, the premixed fuel is injected into the intake manifold to form homogeneous pre-mixture in the combustion chamber and then this pre-mixture is ignited by small amount of diesel fuel directly injected into the cylinder. In the premixed charge compression ignition engine, NOx and smoke concentrations of the exhaust emissions were reduced simultaneously as compared with the conventional diesel engine. But HC emission was increased with the increase of premixed ratio. Also, when EGR system was applied to the PCCI diesel engine, the effect of EGR rate on the combustion characteristics and the exhaust gas emissions was discussed.

Influence of Propane and Butane on Engine Performance in a Homogeneous Charge Compression Ignition(HCCI) Engine (균질혼합압축점화기관에서 프로판과 부탄연료가 기관성능에 미치는 영향)

  • Choi Gyeung Ho;Kim Ji Moon;Han Sung Bin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.3 s.234
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    • pp.417-423
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    • 2005
  • This paper describes the engine performance of a Homogeneous Charge Compression Ignition(HCCI) engine according to Exhaust Gas Recirculation(EGR), cylinder-to-cylinder, fuel of propane and butane. HCCI engines are being considered as a future alternative for diesel and gasoline engines. HCCI engines have the potential for high efficiency, very low NOx emissions and very low particulate matter(PM). On experimental work, we have done an evaluation of operating conditions in a 4-cylinder compression engine. The engine has been run with propane and butane fuels at a constant speed of 1800rpm. This work is intended to investigate the HCCI operation of the engine in this configuration that has been modified from the base diesel engine. The performance and emissions of the engine are presented. In this paper, the start of combustion(SOC) is defined as the $50{\%}$ point of the peak rate of heat release. SOC is delayed slightly with increasing EGR. As expected, NOx emissions were very low for all EGR range and nbuned HC and CO emission levels were high. CO and HC emissions are lower with using propane than butane as fuels of HCCI engines.

Effect of EGR and Supercharging on the Diesel HCCI Combustion (디젤 예혼합 압축착화 엔진에서 배기가스 재순환과 과급의 영향)

  • Park, Se-Ik;Kook, Sang-Hoon;Bae, Choong-Sik;Kim, Jang-Heon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.5
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    • pp.58-64
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    • 2006
  • Homogeneous charge compression ignition(HCCI) combustion is an advanced technique for reducing the hazardous nitrogen oxide(NOx) and particulate matter(PM) in a diesel engine. NOx could be reduced by achieving lean homogeneous mixture resulting in combustion temperature. PM could be also reduced by eliminating fuel-rich zones which exist in conventional diesel combustion. However previous researches have reported that power-output of HCCI engine is limited by the high intensive knock and misfiring. In an attempt to extend the upper load limit for HCCI operation, supercharging in combination with Exhaust Gas Recirculation(EGR) has been applied: supercharging to increase the power density and EGR to control the combustion phase. The test was performed in a single cylinder engine operated at 1200 rpm. Boost pressures of 1.1 and 1.2 bar were applied. High EGR rates up to 45% were supplied. Most of fuel was injected at early timing to make homogeneous mixture. Small amount of fuel injection was followed near TDC to assist ignition. Results showed increasing boost pressure resulted in much higher power-output. Optimal EGR rate influenced by longer ignition delay and charge dilution simultaneously was observed.

Effects of DME/Diesel as an ignition promoter on combustion of hydrogen homogeneous charge compression ignition (수소-예혼합 압축착화 엔진에서 착화제인 DME/diesel이 엔진 연소에 미치는 영향)

  • Jeon, Jeeyeon;Park, Hyeonwook;Bae, Choonsik
    • 한국연소학회:학술대회논문집
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    • 2013.06a
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    • pp.37-40
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    • 2013
  • Hydrogen-dimethy ether (DME) and hydrogen-diesel compression ignition engine combustion were investigated and compared each other in a single cylinder compression ignition engine. Hydrogen and DME were used as low carbon alternative fuels to reduce green house gases and pollutant. Hydrogen was injected at the intake manifold with an injection pressure of 0.5 MPa at fixed injection timing, $-210^{\circ}CA$ aTDC. DME and diesel were injected directly into the cylinder through the common-rail injection system at injection pressure of 30 MPa. DME and diesel inejction timing was varied to find the optimum CI combustion to reduce CO, HC and NOx emissions. When DME was injected early, CO and HC emissions were high while NOx emission was low. Fuel consumption, heat release rate, and exhaust emissions were measured to analyze each combustion characteristics of each ignition promoter. Fuel consumption was decreased when diesel was used as an ignition promoter. This is due to the lower volatility of diesel which created more stratified charge than DME.

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Effects of Two-Stage Injection on Combustion and Exhaust Emission Characteristics in a HCCI Engine (2단분사법에 따른 예혼합압축착화엔진의 연소 및 배기특성)

  • Kook, Sang-Hoon;Park, Cheol-Woong;Choi, Wook;Bae, Choong-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.12 no.5
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    • pp.32-39
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    • 2004
  • HCCI (Homogeneous Charge Compression Ignition) combustion has a great advantage in reducing NOx (Nitrogen Oxides) and PM (Particulate Matter) by lowering the combustion temperature due to spontaneous ignitions at multiple sites in a very lean combustible mixture. However, it is difficult to make a diesel-fuelled HCCI possible because of a poor vaporability of the fuel. To resolve this problem, the two-stage injection strategy was introduced to promote the ignition of the extremely early injected fuel. The compression ratio and air-fuel ratio were found to affect not only the ignition, but also control the combustion phase without a need for the intake-heating or EGR (Exhaust Gas Recirculation). The ignition timing could be controlled even at a higher compression ratio with increased IMEP (Indicated Mean Effective Pressure). The NOx (Nitrogen Oxides) emission level could be reduced by more than 90 % compared with that in a conventional DI (Direct Injection) diesel combustion mode, but the increase of PM and HC (Hydrocarbon) emissions due to over-penetration of spray still needs to be resolved.