• Title/Summary/Keyword: EGR system

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Development of Low Temperature Diesel Combustion Engine for Construction Equipments (건설기계용 저온연소 엔진시스템 개발)

  • Shim, Euijoon;Kim, Duksang;Lee, Dongin;Park, Yonghee
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.6
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    • pp.83-88
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    • 2014
  • LTC(Low Temperature Combustion) technology has been studied to see feasibility of the combustion technology applied to heavy-duty engines on the laboratory scale. This study succeeded to develop a demo engine including realized low temperature combustion under partial load conditions. To find the best feasible LTC strategy, various LTC combustion methods such as PPCI, MK and highly diluted mixing controlled LTC were conducted on 6.0L heavy duty diesel engine. Air management system was re-designed to make these combustion scheme stable and the re-designed air system helped expand LTC operating range. This study finally revealed plausible LTC concept to maximize benefit of the alternative combustion technology while overcoming handicaps of the LTC strategy.

Study on Emission Reduction with Injection Strategy and Exhaust-Gas Recirculation in Gasoline Direct Injection Engine (직접분사식 가솔린 엔진의 분사전략 변경 및 EGR 적용을 통한 배기저감에 관한 연구)

  • Park, Cheol-Woong;Kim, Hong-Suk;Woo, Se-Jong;Kim, Yong-Rae
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.3
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    • pp.335-342
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    • 2012
  • Nowadays, automobile manufacturers are focusing on the reduction of exhaust-gas emissions because of the harmful effects on humans and the environment, such as global warming by greenhouse gases. Gasoline direct injection (GDI) combustion is a promising technology that can improve fuel economy significantly compared to conventional port fuel injection (PFI) gasoline engines. In the present study, ultra-lean combustion with an excess air ratio of over 2.0 is realized with a spray-guided-type GDI combustion system, so that the fuel consumption is improved by about 13%. The level of exhaust-gas emissions and the operation performance with the multiple injection strategy and exhaust-gas recirculation (EGR) are examined in comparison with the emission regulations and from the point of view of commercialization.

Improvement of Emission Performance in a 3.3 Liter DI Diesel Engine by Using Dimethyl Ether Fuel (디메틸에테르 연료를 사용하는 3.3리터 디젤기관의 배기성능 개선)

  • Pyo, Young-Dug;Lee, Young-Jae;Kim, Mun-Heon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.4
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    • pp.178-185
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    • 2007
  • A study is improvement of power and emission in a inline-pump Dr diesel engine by using Dimethyl ether Fuel. Dimethyl ether (DME) is an oxygenated fuel with a cetane number higher than that of diesel oil. It meets the ULEV emission regulation and reduces the smoke to almost zero when used in a diesel engine. But NOx emission is almost same and CO, THC emissions are lower than that of diesel engine. The emissions aren't satisfied the stronger emission regulation in the further. Generally DOC (Diesel Oxidation Catalyst) is used to reduce CO & THC emissions and EGR (Exhaust Gas Recirculation) system is used to reduce NOx emission. Test results showed that the torque and the power with DME were almost same as those of pure diesel oil, but the brake thermal efficiency increased a little. also the BSEC (Brake Specific Energy Consumption) with DME was similar that of diesel. The test results showed that the DOC was the vary effective method to reduce the CO emission in case of Dimethyl Ether Fuel in diesel engine. But, THC emission is showed a little reduction rates. Also EGR system was the very effective method to reduce the NOx emission in case of Dimethyl Ether Fuel in diesel engine.

A Study on the Reduction of Diesel-Engine Emissions (디젤엔진 배기가스의 저감에 관한 연구)

  • Hur, Youn-Bok;Chung, Soon-Suk;Kim, Kwang-Soo
    • Proceedings of the Safety Management and Science Conference
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    • 2012.11a
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    • pp.245-252
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    • 2012
  • Internal engine is the main power source of vehicle and is the main source of air pollution. To satisfy this getting rigorous emission regulation, it must be solved simultaneously the dilemma of reducing emission gas and increasing heat efficiency. Diesel engine is preferred compare with gasoline engine in aspect of energy consumption but it must be solved reducing the containing of NOx, CO and HC. In this study 1. Looking for alternative of performance improvement of Exhaust Gas Recirculation(EGR) which is emission gas reduction system, 2. Reducing malfunction of controlling emission gas 3. Made possible precision control.

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The Effects of Valve Timing Dual Equal Retard/Advance on Performance in an SOHC SI Engine (흡배기 밸브시기 동시 변경이 SOHC SI 엔진성능에 미치는 영향)

  • 엄인용;이원근
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.30-36
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    • 2003
  • Variable valve timing(VVT) mechanisms are used widely for improving fuel consumption and reducing emissions. Most of application, however, are limited in the DOHC engine. Dual equal retard/advance strategy is relatively simple one and can be applied to both SOHC and DOHC engines. In this study, effects of dual equal valve timing retard/advance are investigated to observe the feasibility of VVT system on an SOHC SI engine. The result shows that fuel economy and emissions are improved in the dual retard condition due to increased internal EGR. Some amount of increase in volumetric efficiency can be achieved by advancing valve timing at low speed and by retarding at high speed. In this case, however, full load power is not so much improved as the volumetric efficiency increases because of severe knock. In the dual advance condition, there is no merit in the fuel economy and emission.

Effect of Ultra-high Injection Pressure on Combustion and Emission Characteristics in a Single-cylinder Diesel Engine (초고압 분사 압력 적용에 따른 단기통 디젤 엔진에서의 연소 및 배기 특성에 관한 연구)

  • Cho, Wonkyu;Kang, Seungwoo;Bae, Choongsik;Kim, Youngho
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.41-44
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    • 2015
  • Experimental study was conducted to investigate the effect of ultra-high injection pressure on combustion and emission characteristics in a single-cylinder diesel engine. Electronically controlled ultra-high pressure fuel injection system consistently supplied the fuel of ultra-high pressure up to 250 MPa. Various injection pressures, 40 to 250 MPa, were applied and compared. A injector with eight identical nozzle holes which have diameter of $105{\mu}m$ was used. The results showed high potential to improve the nitrogen oxide (NOx) and particulate matter (PM) trade-off relationship with an ultra-high injection pressure and the exhaust gas recirculation (EGR).

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Effect of Waste Heat Recovery Condensing Boiler with Condensed Water Recirculation Function (응축수 순환이 폐열회수 응축형 보일러 성능에 미치는 영향)

  • Keum, Kuk Bin;Kim, Sooik;Yu, Byeong-Hun;Lee, Chang Eon
    • 한국연소학회:학술대회논문집
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    • 2015.12a
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    • pp.201-204
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    • 2015
  • Recently, energy excessive consumption and environmental pollution are the social issued. The most efficient way to solve both energy excessive consumption and environmental pollution is existing combustion system improved. This study was part of the assume and commercial used existing waste heat recovery condensing boiler to low emission performance for exhaust gas recirculation(EGR) and thermal efficiency rise by applying the condensed water recirculation(CWR) conducted. The researchers applied the EGR and CWR develop a new concept for the condensed water recirculation waste heat recovery condensing boiler. Waste heat recovery condensing boiler applied to the condensed water recirculation thermal efficiency of the same conditions was increased by about 4.8~5.5% and pollution emission also decreased.

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Development of Gasoline Engine Renewal CNG Generator and a Study on Exhaust Gas Characteristics of Equivalent Diesel Engine (가솔린 엔진개조 CNG 발전기 개발과 동급 디젤엔진의 배출가스 특성 연구)

  • Lee, Jung-Cheon;Kim, Ki-Ho;Lee, Jung-Min;Park, An-Young
    • Journal of Power System Engineering
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    • v.22 no.6
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    • pp.74-79
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    • 2018
  • Compressed natural gas has a high octane number and low particulate emission characteristics as compared with petroleum-based fuels, so it can respond to exhaust gas regulations positively. A natural gas engine has been introduced to improve the quality of the atmosphere, a diversity of fuel, a stable supply, and it has widely been used in city buses and garbage trucks. Recently, the natural gas engine has received attention by overcoming the disadvantage of the theoretical air-fuel ratio method through the development of EGR cooler and engine parts with the development of LP-EGR technology. In this study, we try to develop the cogeneration system that can simultaneously generate electric power and heat by remodeling the gasoline engine to the mixer type CNG engine. As a result, it was able to reduce the NOx (approximately 77%) compared to the diesel engines with same displacement.

A Study of the Reduction of Diesel-Engine Emissions for Off-Road Vehicles (비도로 차량용 디젤엔진의 배기가스 저감에 관한 연구)

  • Cho, Gyu-Baek;Kim, Hong-Suk;Kang, Jeong-Ho
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.35 no.6
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    • pp.577-583
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    • 2011
  • To meet the requirements of the Tier 4 interim regulations for off-road vehicles, emissions of particulate matter (PM) and nitrogen oxides (NOx) must be reduced by 95% and 30%, respectively, compared to current regulations. In this research, both the DPF and HPL EGR systems were investigated, with the aim of decreasing the PM and NOx emissions of a 56-kW off-road vehicle. The results of the experiments show that the DOC-DPF system is very useful for reducing PM emissions. It is also found that the back pressure is acceptable, and the rate of power loss is less than 5%. By applying the HPL EGR system to the diesel engine, the NOx emissions under low- and middle-load conditions are reduced effectively because of the high differential pressure between the turbocharger inlet and the intake manifold. The NOx emissions can be decreased by increasing the EGR rate, but total hydrocarbon (THC) emission increases because of the increased fuel consumption needed to compensate for the power loss caused by EGR and DPF.

A Study on Application of Mono-Ether Group(Ethylene Glycol Mono-n-Butyl Ether) Oxygenated Fuel in an IDI Diesel Engine (간접분사식 디젤기관에서 Mono-Ether 계열 함산소연료(Ethylene Glycol Mono-n-Butyl Ether)의 적용에 관한 연구)

  • Choi, S.H.;Oh, Y.T.
    • Journal of Power System Engineering
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    • v.9 no.3
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    • pp.15-20
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    • 2005
  • In this paper, the effect of oxygen component in fuel on the exhaust emissions has been investigated for an indirect injection diesel engine. It was tested to estimate change of engine performance and exhaust emission characteristics for the commercial diesel fuel and oxygenated blended fuel which has four kinds of mixed ratio. And, the effects of exhaust gas recirculation(EGR) on the characteristics of NOx emission have been investigated. Ethylene glycol mono-n-butyl ether(EGBE) contains oxygen component 27% in itself, and it is a kind of effective oxygenated fuel of mono-ether group that the smoke emission of EGBE is reduced remarkably compared with commercial diesel fuel, that is, it can supply oxygen component sufficiently at higher loads and speeds in diesel engine. It was found that simultaneous reduction of smoke and NOx was achieved with oxygenated fuel(10vol-%) and cooled EGR method(10%).

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