• Title/Summary/Keyword: Internal combustion engine

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Comparative Study of Powertrain Loss and Efficiency for the Electric Vehicle and Internal Combustion Engine Vehicle (전기차와 내연기관차의 파워트레인 손실 및 효율 비교)

  • Kim, Jeong-Min
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.18 no.7
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    • pp.29-35
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    • 2019
  • In this paper, the component loss models of the electric vehicle(EV) and the internal combustion engine vehicle(ICEV) are developed to analyze the losses and efficiencies of these two types of vehicles. The EV powertrain efficiency decreases as the vehicle velocity increases over most of the vehicle velocity range because the battery efficiency decreases. Especially, the EV powertrain efficiency decreases significantly when the battery SOC is low. But the ICEV powertrain efficiency increases as the vehicle velocity increases. This is because the efficiencies of both the transmission and engine increases.

Development of a New Rapid Compression-Expansion Machine for Combustion Test of Internal Combustion Engine (내연기관의 연소실험을 위한 신형 급속 압축-팽창 장치의 개발)

  • 정남훈;배종욱
    • Journal of Advanced Marine Engineering and Technology
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    • v.24 no.5
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    • pp.69-75
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    • 2000
  • Investigators who study on combustion in the cylinders of reciprocating piston type internal combustion engines have been encountered embarrassments due to the difficulties of adjusting specific parameter without interfacing other parameters such as cylinder wall temperature, composition of gas in the cylinder, existence of cylinder lubricant etc. Rapid compression expansion machine, the position and speed of piston of which are able to be controlled by means of a system controlled electrically, and actuated hydraulically could be utilized as one of the most preferable countermeasures against those difficulties. Several units of rapid compression expansion machines were developed but the speed up of frequency of piston movement still is the problem to be improved to copy with actual speed of internal combustion engines. Authors designed and manufactured a new rapid compression-expansion machine electrically controlled, hydraulically actuated, and computer programed and then examined the performance of one. Results of a set of experiments revealed acquirements of certain improvement on frequency of piston movement preserving the stability of system response and reproducing accurate compression ratio of cylinder, those are the key function for the in-cylinder combustion experiments on internal combustion engines.

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Optimal Fuzzy Control of Parallel Hybrid Electric Vehicles

  • Farrokhi, M.;Mohebbi, M.
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.910-914
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    • 2005
  • In this paper an optimal method based on fuzzy logic for controlling parallel hybrid electric vehicles is presented. In parallel hybrid electric vehicles the required torque for deriving and operating the on-board accessories is generated by a combination of internal-combustion engine and an electric motor. The powersharing between the internal combustion engine and the electric motor is the key point for efficient driving. This is a highly nonlinear and time varying plant and its control strategy will be implemented with the use of fuzzy logic controller. The fuzzy logic controller will be designed based on the state of charge of batteries and the desired torque for driving. The output of controller controls the throttle of the combustion engine. The main contribution of this paper is the development of an optimal control based on fuzzy logic, which maximizes the output torque of the vehicle while minimizing fuel consumed by the combustion engine.

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A Study on the Controller Design of Internal Combustion Engine by LMI Approach (선형 행렬 부등식을 이용한 내연기관의 제어)

  • Kim, Yeong-Bok;Byun, Jeong-Hwan;Yang, Ju-Ho
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.33 no.1
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    • pp.59-67
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    • 1997
  • This paper gives a controller design method by Linear Matrix Inequality(LMI) for internal combustion engine with Continuously Variable Transmission(CVT) which satisfies the given $H_\infty$ control performance and robust stability in the presence of physical parameter perturbations. To the end, the validity and applicability of this approach are illustrated by simulation in the all engine operating regions.

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A Numerical Study of Combustion Characteristics for HCCI Engine with Detailed Diesel Surrogate Chemical Mechanism (Diesel Surrogate 상세 반응 기구를 이용한 HCCI 엔진의 연소 특성에 관한 수치해석 연구)

  • Lee, Won-Jun;Lee, Seung-Ro;Lee, Chang-Eon
    • Journal of the Korean Society of Combustion
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    • v.16 no.2
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    • pp.9-15
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    • 2011
  • Homogeneous charge compression ignition(HCCI) is the best concept able to provide low NOx and PM in diesel engine emissions. This new alternative combustion process is mainly controlled by chemical kinetics in comparison with the conventional combustion in internal combustion engine. In this paper, combustion characteristics of HCCI engine with suggested diesel surrogate(heptane/toluene mixture fuel) reaction mechanism were numerically investigated by heptane/toluene mixture ratio and EGR ratio. As results, the ignition timing became faster with increasing of heptane, and an initial oxidation and the ignition timing of the mixture fuel were affected by heptane and toluene, respectively.

A study on Greenhouse gas Emission Characteristics of Conventional Passenger and Hybrid Electric Vehicles (승용 및 하이브리드 자동차 온실가스 배출특성 연구)

  • Lim, Yun Sung;Mun, Sun Hee;Chung, Taek Ho;Lee, Jong Tae;Dong, Jong In
    • Journal of ILASS-Korea
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    • v.25 no.1
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    • pp.34-39
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    • 2020
  • Automotive manufacturers are applying technologies for greenhouse gas reduction such as vehicle weight reduction, engine downsizing, direct injection technology, variable valves and transmission performance improvement to achieve the targets for enhanced greenhouse gas and fuel consumption efficiency. In this paper, compared and analyzed greenhouse emissions according to engine capacity, engine displacement, curb weight and sales volume of hybrid and internal combustion engine passenger vehicles. Hybrid emit 32~39% less greenhouse gas than internal combustion engines through the combined mode test method. Hybrid electric vehicle's curb weight was about 7% heavier on average for the same engine displacement, while greenhouse gas was about 36% lower. It was confirmed that in order to reduce the emission of pollutants of greenhouse gases as well as the air pollutants, it is necessary to expand the supply of eco-friendly vehicles.

NUMERICAL STUDY ON THE COOLANT FLOW AND HEAT TRANSFER IN THE CYLINDER HEAD ASSEMBLY OF AN INTERNAL COMBUSTION ENGINE (내연기관 실린더 헤드 조립체 내부의 냉각수 유동 및 열전달에 관한 연구)

  • Suh, Y.K.;Heo, S.G.;Kim, B.H.
    • Journal of computational fluids engineering
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    • v.14 no.1
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    • pp.9-17
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    • 2009
  • In this study we investigated the characteristics of fluid flow and heat transfer within a coolant passage in the cylinder head assembly of an internal combustion engine by using a commercial CFD code, CFX The complex coolant passage of the cylinder head assembly was modelled by suitable choice of a grid system and careful attention was paid in the construction of meshes near the walls where significant cooling occurs. To treat the simultaneous heating and cooling of the combustion walls we invented a methodology allowing a heat source within the solid wall and the convective cooling at the interface between the solid and the fluid. We managed to reproduce the experimental results by adjusting parameters appropriately. We have found that high temperature was concentrated at the surface of the cylinder jacket. It turned out that the effect of oil cooling from the piston head was unexpectedly significant. On the other hand the effect of cooling from the ambient air is almost negligible. The CFD method proposed in this study is believed to be useful in the early stage of the design of the engine-cooling system.

Test Method for Engine Performance in Compression Ignition Engine (압축 착화기관의 엔진 성능 시험방법)

  • Kwon, Soon-Ik
    • Journal of the Korean Society of Industry Convergence
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    • v.5 no.4
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    • pp.295-299
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    • 2002
  • Specific fuel consumption or specific power output characteristics of an internal combustion engine are likely, in conventional applications, the most important operating criteria. In this work, the test method for the engine performance was introduced in a compression ignition(diesel) engine.

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Energy Consumption of the Electric Vehicle and Internal Combustion Engine Vehicle for Different Driving Cases (주행 상황에 따른 전기차와 내연기관차의 에너지 소비 비교)

  • Kim, Jeong-Min
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.19 no.5
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    • pp.8-13
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    • 2020
  • In this paper, the electric vehicle (EV) and internal combustion engine vehicle (ICEV) are compared for different driving cases. The EV exhibits a lower powertrain efficiency when driven on the aggressive driving cycle than when driven on the moderate cycle. In particular, EV powertrain efficiency is low when the battery state of charge (SOC) is low, but ICEV efficiency increases when the driving cycle changes from the moderate cycle to the aggressive cycle. Based on these results, attempts can be made to increase EV powertrain efficiency. EV charging before the battery power drops to a low charging state can reduce energy consumption by 2.7% for an urban area. Furthermore, ECO driving has a more significant effect on EVs than on ICEVs.

A Study on Correlation between A/F and ion signal in a Constant-Volume Chamber Using Spark-plug Ionization Probe Itself (정적챔버에서 스파크 플러그 이온프로브를 이용한 공연비와 이온신호와의 상관관계에 대한 연구)

  • Park, Jong-Il;Chun, Kwang-Min;Hahn, Jae-Won;Park, Chul-Woong
    • 한국연소학회:학술대회논문집
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    • 2002.11a
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    • pp.223-229
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    • 2002
  • Spark plug ionization signal could be useful in an internal combustion engine as a feedback signal for combustion diagnostics such as misfire detection, knocking detection and lambda control, but the signal has high level of cyclic fluctuation in an internal combustion engine due to residual gas, pressure, temperature, mixture composition in the spark gap. Because of this reason it is very difficult to apply ion signal to commercial engine control. In this Study, a correlation between A/F and spark plug ionization signal was studied in a constant volume chamber. Constant volume chamber with gas phase fuel(Propane) has homogeneous fuel composition , no mixture flow, same pressure and temperature on each test. The results show that mean chemi-ion signal has the highest correlation with A/F and intial pressure change has on effect on the thermal-ion signal and not on chemi-ion signal.

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