• Title/Summary/Keyword: Turbocharged diesel engine

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COMBUSTION AND EMISSION CHARACTERISTICS OF A TURBOCHARGED DIESEL ENGINE FUELLED WITH DIMETHYL ETHER

  • Wu, J.;Huang, Z.;Qiao, X.;Lu, J.;Zhang, L.;Zhang, J.
    • International Journal of Automotive Technology
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    • v.7 no.6
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    • pp.645-652
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    • 2006
  • This paper is concerned with an experimental study of a turbocharged diesel engine operating on dimethyl ether(DME). The combustion and emission characteristics of DME engine were investigated. The results showed that the maximum torque and power with DME could achieve a greater level compared to diesel operation, particularly at low speeds; the brake specific fuel consumption with DME was lower than the diesel at low and middle engine speeds. The injection delay of DME was longer than that of diesel. However, the maximum cylinder pressure, maximum pressure rise rate and combustion noises of DME engine were lower than those of diesel. The combustion velocity of DME was faster than that of diesel, resulting in a shorter combustion duration of DME. Compared with the diesel engine, $NO_x$ emissions of the DME engine were reduced by 41.6% on ESC data. The DME engine was smoke free at all operating points of the engine.

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.

A Study on the Volumetric Efficiency Improvement by Variable Induction & Exhaust System in a Turbocharged Diesel Engine (가변 흡.배기시스템에 의한 과급디젤기관의 체적효율 향상에 관한 연구)

  • Kang, H.Y.;Koh, D.K.
    • Journal of Power System Engineering
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    • v.12 no.1
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    • pp.13-19
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    • 2008
  • In this study, a variable induction and exhaust system is applied to turbocharged diesel engine to improve the volumetric efficiency, especially, in a low and transient engine speed range where much of the pollutant matters are expelled out. The volumetric efficiency is known as one of the most important factor which affects significantly engine performance, fuel economy and further emission and noise level. As the torque increase with the engine speed up, the gas flow in an exhaust pipe become pulsating and then has an effect on boost up capacity of air charging into the cylinder and expelling capacity to atmosphere simultaneously. But at a low and idling speed, the pulsation effect was not so significant. Accordingly, resonator was employed to compensate their loss. The variable induction system consists of the secondary pipe, resonator, intercooler, and torque variance were examined with extended operating conditions. In the mean time, for interpretation and well understanding for the phenomena of wave action that arising during intake and exhaust process between turbocharger and variable intake system, the concept of the combined supercharging was introduced. Some of results are depicted which deal with a pressure history during valve events of induction process. Consequently, by the governing of these phase and amplitude of pulsating wave, it enables us to estimate and evaluate for the intake system performance and also, designing stage of the system layout.

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A Study on the Response Performances under Transient Operating Conditions in a Turlblocharged Diesel Engine (터보과급 디젤기관의 과도운전시 응답성능에 관한 연구)

  • 최낙정;이창식
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.8
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    • pp.1575-1582
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    • 1992
  • This study describes the response performances of actual engine speed, turbocharger speed, air mass flow rate through engine, boost pressure ratio, exhaust temperature and combustion efficiency for a six-cylinder four-stroke turbocharged diesel engine during the change in operating conditions by using the computer simulation with test bed. In order to obtain the transient conditions, a suddenly large load was applied to the simulation engine with the several kinds of inertia moment in turbocharger and engine, and engine set speed. From the results of this study, the following conclusions were summarized The inferior response performances was mainly caused by turbocharger lag, and air mass flow rate and boost pressure ratio were closely related to the turbocharger speed. A reduced moment of turbocharger inertia resulted in less transient speed drop and much faster recovery to the steady state of the engine. The increase of moment of engine inertia reduced cyclic variation of engine speed. When a large load was applied to the engine at high speed, the engine could be fastly recovered. However, when the same load was applied to the engine at low speed, the engine was stalled.

An experimental study on the flow characteristics of intake and exhaust in turbocharged diesel engine (배기 과급 디젤기관의 흡배기 유동특성에 관한 실험적 연구)

  • 배원섭
    • Journal of the korean Society of Automotive Engineers
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    • v.13 no.6
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    • pp.48-56
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    • 1991
  • This paper describes the experimental investigations on the pressure variations of intake and exhaust manifold and mass flow rate through exhaust turbine of turbocharged 6-cylinder diesel engine. The turbocharger of experimental diesel engine is constructed with the radial ty pe exhaust turbine and blower driven by exhaust gases. The pressure variations were measur ed by pressure transducer at the points such as turbine inlet and outlet, compressor inlet and outlet, and inlet pipe and exhaust manifolds for normal and combined charging engines with the change of engine speed. The experimental results of this study show that the mass flow rate of exhaust turbine and the variations of pressure in intake and exhaust manifold are all increased with the increase of engine speed.

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A Modular Simulation Model for Turbocharged Diesel Engines (터보과급기가 부착된 디젤엔진의 모듈화된 시뮬레이션 모델)

  • 강동헌;홍금식;이교일
    • Journal of Institute of Control, Robotics and Systems
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    • v.4 no.5
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    • pp.680-688
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    • 1998
  • A modular programming approach for simulation/control of turbocharged diesel engines is investigated. The MATLAB/SIMULINK, which provides easy construction of various control modules and handy retrieval of objects, is adopted as a programming environment. The mathematical models for diesel engines are utilized from the literature. The object-oriented modules, which represent mechanical parts or theoretical algorithms for engines, are easily transferable to other application programs in the same environment. The simulation model is applied to a 4 strokes diesel engine. Details of the block diagrams of example modules are demonstrated. Finally, a PI controller and a sliding mode controller are applied to the simulator constructed for a typical turbocharged diesel engine.

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A Exhaust Gas Study by EGR in Heavy-Duty Diesel Engine (대형디젤기관에서 EGR에 의한 배출가스 연구)

  • 한영출;류정호;오용석;이현우;강호인
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.3
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    • pp.285-291
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    • 2000
  • EGR(Exhaust Gas Recirculation) is known as the technique reducing the NOx emissions from diesel engine. Low pressure roote and high pressure roote are applied for heavy-duty diesel engine are. In this study, as research for the heavy duty diesel engine equipped with EGR, reduction characteristic of CO, THC, NOx, and PM in HD diesel engines are investigated by applying EGR device. Also, through the experiments using 11 liters, turbocharged diesel engine with EGR valve and intercooler, exhaust gas reduction characteristics were measured as changing in EGR rate according to D-13 mode.

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Engine Performance Simulation to Evaluate the NOx Reduction of Charge Air Moisturizer System in a Medium Speed Diesel Engine (흡기가습 중형 디젤 엔진의 NOx 저감 평가를 위한 성능 해석 연구)

  • Kim, Ki-Doo;Park, Hyoung-Keun;Kim, Byung-Suck;Ha, Ji-Soo
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.15-16
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    • 2005
  • In this study, the characteristics of NOx reduction by using charge air moisturizer system were evaluated by engine performance simulation in medium speed diesel engines. The results of performance simulation were verified by experimental results of single cylinder medium speed diesel engine equipped with charge air moisturizer system. Performance simulation was carried out to evaluate charge air moisturizer system of turbocharged diesel engine, HYUNDAI HiMSEN 9H25/33 engine. Those results show 50% NOx reduction at dew point $80^{\circ}C$ and charge air pressure 4bar.

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Analysis of Performance Characteristics on Diesel Engine with Aftertreatment and EGR System (후처리 시스템을 장착한 디젤엔진의 EGR 밸브 작동에 따른 성능 분석)

  • Park, Cheol-Woong;Choi, Young;Lim, Gi-Hun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.5
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    • pp.124-129
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    • 2010
  • The direct injection (DI) diesel engine has become a prime candidate for future transportation needs because of its high thermal efficiency. However, nitrogen oxides (NOx) increase in the local high temperature regions and particulate matter (PM) increases in the diffusion flame region within diesel combustion. Therefore, the demand for developing hybrid system consist of exhaust gas recirculation (EGR) and aftertreatment system as well as diesel particulate filter (DPF) or lean NOx trap (LNT) should be applied. The variation of EGR rate due to the malfunction of EGR valve can affect not only the combustion stability of engine but also the performance of aftertreatment system. In this research, 2.0 liter 4-cylinder turbocharged diesel engine was used to investigate the combustion and emission characteristics for various operating conditions with EGR. While the fuel consumption was increased with increase of EGR rate, NOx emission was improved by maximum 90% at low speed, low load operating condition. To achieve combustion stability and reliability of aftertrearment system with minimum penalty in fuel consumption and emissions, the fault diagnosis of EGR malfunction must be employed.

A Study on Engine Performance and Exhaust Emission Characteristics of Response Power 150HP Turbocharged Diesel engine (대응출력 150마력 터보차저 디젤기관의 동력성능 및 배출특성에 관한 연구)

  • Kim, Tae-Hyun;Lee, Chi-Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.11 no.6
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    • pp.100-106
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    • 2012
  • This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped turbocharger to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more NOX and $O_2$, but it doesn't significantly affect the result when it comes with decreasing of $CO_2$ and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.