• Title/Summary/Keyword: 과급 디젤엔진

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Turbine Efficiency Analysis of Steady Flow in a Twin Scroll Turbocharger (트윈 스크롤 터보과급기에서 정상유동의 터빈 효율 분석)

  • Chung, Jin-Eun;Jeon, Se-Hun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.21 no.11
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    • pp.765-770
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    • 2020
  • The turbochargers used widely in diesel and gasoline engines are effective devices to reduce fuel consumption and emissions. In this study, the isentropic turbine efficiency of the steady flow in a twin-scroll turbocharger for the passenger vehicle gasoline engine was analyzed. The cold gas test bench was designed and made. The pressure and temperature of the inlet and exit of the turbine were measured at 60,000, 70,000, 90,000, and 100,000rpm under the steady-state flow. The isentropic turbine efficiency was calculated. The efficiency was the range of 0.53 to 0.57. The BSR and expansion ratio were changed from 0.71 to 0.84 and from 1.24 to 1.72, respectively. The isentropic turbine efficiency decreased with increasing BSR and expansion ratio. The operation of only scroll A or B was compared with that of the twin-scroll turbine. The isentropic efficiency of using only scroll B was higher than those of only scroll A at 60,000rpm. The isentropic efficiency of using only scroll A was higher than those of only scroll B at 100,000rpm. Therefore, the twin-scroll turbine used in this study is operating effectively in the wide speed range.

프랑스의 최신예 AMX Leclerc 주전차

  • Min, Ga-Jin
    • Defense and Technology
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    • no.2 s.144
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    • pp.36-49
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    • 1991
  • Leclerc 전차는 "혁명적'방식의 장갑을 탑재하고 있다. 이 장갑은 주하중-베아링 축에 부착되는 module화된 복합 물질 요소로 구성되었으며, 손쉽게 맞춰 달수 있고, 교체가 가능하다. 이에 따라 전장에서 신속한 수리가 가능하며, 최신기술의 장갑 장착이 용이하다. 또한 기동성의 면에서 Lecerc 전차는 최신세대의 초압축형 1천5백마력 과급기형 디젤엔진을 탑재한 최초의 전차이다. 그 결과 이 전차의 차체는 Leopard 2나 M1과 같은 제2세대 전차에 비해 현저히 짧다. 현재 M1A2, 신형 Leopard 2, Challenger 2 등과 영국의 치프텐 전차 대체사업 수주를 위해 경쟁중에 있다

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Prediction of the Transient Performance of the Passenger Diesel Engine with Turbocharger using HIL (HIL을 이용한 터보과급기 승용 디젤 엔진의 과도 성능 예측)

  • Chung, Jin-Eun;Jin, Young-Wook;Jeong, Dong-Young;Chung, Jae-Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.5
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    • pp.127-132
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    • 2009
  • The transient performance of the passenger diesel engine equipped with the variable geometry turbocharger was simulated using HIL(hardware-in-the-loop) system. The system consists of engine model as software, and the turbocharger test bench as hardware. The engine model is mean value model which is programmed by the Simulink of the Mathworks. The turbocharger test bench is composed of a blower, some sensors, and DAQ boards. A real time simulation is possible since the operating system based on the real time is included. The results show the good response for the transient characteristics. Therefore this HIL system can be used for development of the new turbocharger effectively.

The Effect of EGR Pipe Configuration on EGR Characteristics of Diesel Engine with Variable Geometry Turbocharger (EGR관 형상이 가변형상 과급기를 장착한 디젤엔진의 EGR 특성에 미치는 영향)

  • Jeong, Soo-Jin;Chung, Jae-Woo;Kang, Jeong-Ho;Kang, Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.65-73
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    • 2007
  • The use of an Exhaust Gas Recirculation(EGR) for a diesel engine with variable geometry turbocharger(VGT) has confronted how to obtain the amount of EGR for NOx reduction requirement at wide operating range and less side effect. Through a combined effort of modeling(wave action simulation) and experiment, an investigation into the effect of EGR area ratio and pipe length on EGR characteristics of common rail diesel engine with VGT has been performed. For accurate computation, calibration of constants involved in empirical and semi-empirical correlations has been performed at a specific operating point, before of its use for engine simulation. From the results of this study, it was found that EGR rate is sharply increased with increasing EGR area ratio until area ratio of 0.3. However, the effect of EGR area ratio on EGR rate is negligible beyond this criteria. This study also investigates the effect of EGR pipe length on a EGR amount and pulsating flow characteristics at EGR junction. The results showed that the longer EGR pipe length, the lower EGR amount was achieved due to the flow loss resulting in lower amplitude of pressure wave.

A Study on the Effect of Exhaust System Configuration on Scavenging Characteristic of a Four-Cylinder Turbocharged Diesel Engine (배기계 형상이 과급기를 장착한 4실린더 디젤엔진의 소기성능에 미치는 영향에 관한 연구)

  • Jeong, Soo-Jin;Chung, Jae-Woo;Kang, Woo;Kim, Woo-Seung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.3
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    • pp.35-43
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    • 2006
  • A four-stroke four-cylinder turbocharged diesel engine can be fitted with various types exhaust system. In this paper, the impacts of exhaust system design on scavenging performance and wave action characteristic during valve overlap are investigated by using one-dimensional gas dynamic code. This work shows that a huge reflected exhaust pressure waves which reaches the exhaust port during valve overlap period is crucial design factor which determines quality and quantity of the fresh charge. Hence pressure wave that reaches the exhaust port of the cylinder during the valve overlap sequence should be weakened for good scavenging performance. This paper describes advantages and disadvantages of the various exhaust systems applied to a turbocharged and intercooled 4-cylinder diesel engine system in terms of scavenging efficiency and engine performance. To verify the computational results, experimental comparison has also performed.

Coordinated Control of EGR and VGT in the Diesel Engine (승용 디젤엔진에서 EGR과 VGT의 공동 제어)

  • Huh, Jun-Young;Chung, Jin-Eun;Jin, Young-Wook;Kang, Woo;Chung, Jae-Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.4
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    • pp.159-164
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    • 2008
  • In diesel engine technology the drive to reduce emissions and fuel consumption with improved performance targets has led to many advances. In particular, Exhaust Gas Recirculation (EGR) and Variable Geometry Turbocharger (VGT) have played a key role in achieving these aims by permitting flexible control of the engine inlet gas charge. The full potential of these devices are difficult to achieve due to limitations in the classical control methods. However, fuzzy logic is particularly appealing due to its simple heuristic nature. The controller used in this work was designed using the Matlab Fuzzy Logic Toolbox. The overall object is to access the potential for emissions and fuel consumption reductions during transient events whilst maintaining and even improving driveability. Classical control methods (PID), as used on production engines, are examined and contrasted with an coordinated control that utilizes fuzzy logic.

The Effect of EGR on Exhaust Emissions in a Direct Injection Diesel Engine (직분식 소형 과급 디젤엔진에서 EGR이 배기배출물에 미치는 영향)

  • Jang, Se-Ho;Koh, Dae-Kwon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.5
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    • pp.188-194
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    • 2005
  • The direct injection diesel engine is one of the most efficient thermal engines. For this reason DI diesel engines are widely used for heavy-duty applications. But the world is faced with very serious problems related to the air pollution due to the exhaust emissions of diesel engine. So, that is air pollution related to exhaust gas resulted from explosive combustion should be improved. Exhaust Gas Recirculation(EGR) is a proven method to reduce NOx emissions. In this study, the experiments were performed at various engine loads while the EGR rates were set from $0\%$ to $30\%.$ The emissions trade-off and combustion of diesel engine are investigated. The brake specific fuel consumption rate is very slightly fluctuated with EGR in the range of experimental conditions. The ignition delay increased with increasing EGR rate. The maximum value of premixed combustion for the rate of heat release is increased with increasing EGR rate. NOx emissions are decreased with increasing EGR rate at high load and high speed. 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 emissions.

The Effect of Control of the VGT and EGR in a Turbocharged Common-Rail Diesel Engine on Emissions under Partial Loads Conditions (부분부하에서 커먼레일 과급 디젤엔진의 VGT와 EGR 제어가 배출물에 미치는 영향)

  • Jeong, Soo-Jin;Chung, Jae-Woo;Kang, Jeong-Ho;Kang, Woo
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.6
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    • pp.151-158
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    • 2007
  • The static and dynamic behaviour of VGT and EGR systems has a significant impact on overall engine performance, fuel economy and exhaust emissions. This is because they define the state and composition of the air charge entering the engine. This work focused on the effect of the aperture ratio of VGT and EGR on the emission and flow characteristics under partial loads conditions. The investigation carried out using 2 liter PCCI 4 cylinder diesel engine with VGT and EGR. The result of this study shows that smoke increases with increasing EGR rate and NOx decreases with increasing EGR rate. It was also found that the residual gas contents greatly impact on soot emission under partial load condition. Finally, it can be concluded that VGT and EGR aperture ratio can greatly impact not only on soot and NOx but also air charging.

A Study on the Flow Characteristics and Engine Performance with Swirl Ratio Variance of Intake Port (흡기포트 선회비 변경에 따른 유동특성 및 엔진성능에 관한 연구)

  • Yoon, Jun-Kyu;Cha, Kyung-Ok
    • Proceedings of the KSME Conference
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    • 2000.04b
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    • pp.899-905
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    • 2000
  • The characteristics of air flow and engine performance with swirl ratio variance of intake port In a turbocharged DI diesel engine was studied in this paper. The intake port flow is important factor which have influence on the engine performance and exhaust emission because the properties in the injected fuel depend on the combustion characteristics. The swirl ratio for ports was modified by hand-working and measured by impulse swirl meter. For the effects on performance and emission, the brake torque and brake specific fuel consumption were measured by engine dynamometer and NOx, smoke were measured by gas analyzer and smoke meter. As a result of steady flow test, when the valve eccentricity ratio are closed to cylinder wall, the flow coefficient and swirl intensity are increased. And as the swirl ratio is increased, the mean flow coefficient is decreasing, whereas the gulf factor is increasing. Also, through engine test its can be expected to meet performance and emission by optimizing the main parameters; the swirl ratio of intake port, injection timing and compression ratio.

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Response Characteristics of the HIL System for Passenger Diesel Engine (승용 디젤엔진 HIL 시스템의 응답 특성)

  • Chung, Jin-Eun;Roh, Ho-Jong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.11
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    • pp.4745-4750
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    • 2011
  • A HIL(hardware-in-the-loop) system was established and the simulation was carried out to determine whether the system operates normally. The system consists of turbocharger test bench, HIL platform with real time S/W and DAQ, and engine model using Matlab/Simulink. In the simulation the supplied fuel rate is changed step-by-step from 1.8944 kg/h to 4.7360 kg/h. The change of air-fuel ratio is analyzed and observed whether the air-fuel ratio follow the target air-fuel ratio 32. When the supplied fuel rate is changed, the air-fuel ratio is converged to the target air-fuel ratio after about 20 seconds. And the vane duty ratio of turbine and the boost pressure of compressor are also changed properly. Therefore this HIL system can be used to develop the new turbocharger and improve the performance of the modified turbocharger.