• Title/Summary/Keyword: automotive engine

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Basic Performance Characteristics of HCCI (Homogeneous Charge Compression Ignition) Engine

  • Choi Gyeung Ho;Chung Yon Jong;Kim Ji Moon;Dibbler Robert W.;Han Sung Bin
    • Journal of Energy Engineering
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    • v.14 no.4 s.44
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    • pp.226-231
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    • 2005
  • Essentially 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. 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. In this research, a 4 cylinder diesel engine was converted into a HCCI engine, and propane was used as the fuel. The purpose of this research is to show the effects of fuel flow rate and the temperature of the intake manifold on the performance and exhaust of an HCCI engine.

Measurement and Analysis of Deterioration in the Automobile Engine Oil (자동차용 엔진오일의 열화도 측정 및 분석)

  • 김원태;최만용;박해원;박정학
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2003.06a
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    • pp.521-524
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    • 2003
  • This paper is aimed to develop the circuit of a coil-type oil sensor packaged to the automotive engine oil monitoring the deterioration in the driving condition and let a driver notify the optimized time for the exchange of engine oil. By applying the principle which the deterioration of automotive engine oil can be expressed to the dielectric constant, the capacitance bridge circuit and the integrator circuit are designed and packaged to a coil-typed engine oil. In this study. the range of operating temperature of engine oil is experimentally recommended within 55$^{\circ}C$ for the stability of a sensor designed. It is concluded that the characteristics of output voltage converted from the dielectric constant are linearly distributed.

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Network Analysis of Engine Lubrication System

  • Chun, Sang Myung;Park, Young Hwan;Jang, Siyoul
    • KSTLE International Journal
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    • v.1 no.1
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    • pp.21-28
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    • 2000
  • A computer program fur the analysis of engine lubrication systems has been developed. And a case study of a four cylinders gasoline engine is illustrated. This paper gives the mathematical models far oil flow through hydraulic tappet as well as those of oil jet and plain journal bearings. And the flow from an oil pump and the flow resistance through an oil filter is considered at various temperatures. In the analysis, the various design guidelines are applied. The distribution of flow and pressure of an engine lubrication system are calculated, and the pressure data compared with the experimental data at a few points in the engine lubrication system. This method is helpful to design of engine lubrication system efficiently.

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Development of the low emission gasoline engine (국산 가솔린 엔진용 저배기공해 system에 관한 연구)

  • 성낙원;정용일;우세종
    • Journal of the korean Society of Automotive Engineers
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    • v.8 no.3
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    • pp.16-27
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    • 1986
  • In this study, low emission gasoline engine system is developed utilizing an EGR valve, 3 way catalytic converter and electronic fuel injection system. EGR was controlled by a needle valve and optimized at the engine conditions. Throttle body fuel injection system is used for fueling. When the engine was operated at constant speed by the electronic engine control system with the 3 way catalytic converter, th emissions were reduced by 50 to 90% in volume depending on he engine operating conditions.

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Development of Simulation Program of Automotive Engine Cooling System (자동차 엔진냉각계의 해석 프로그램의 개발)

  • 배석정;이정희;최영기
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.11
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    • pp.943-956
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    • 2003
  • A numerical program has been developed for the simulation of automotive engine cooling system. The program determines the mass flow rate of engine coolant circulating the engine cooling system and radiator cooling air when the engine speed is adopted by appropriate empirical correlation. The program used the method of thermal balance at individual element through the model for radiator component in radiator analysis. This study has developed the program that predicts the coolant mass flow rate, inlet and outlet temperatures of each component in the engine cooling system (engine, transmission, radiator and oil cooler) in its state of thermal equilibrium. This study also combined the individual programs and united into the total performance analysis program of the engine cooling system operating at a constant vehicle speed. An air conditioner system is also included in this engine cooling system so that the condenser of the air conditioner faces the radiator. The effect of air conditioner to the cooling performance, e.g., radiator inlet temperature, of the radiator and engine system was examined. This study could make standards of design of radiator capacity using heat rejection with respect to the mass flow rate of cooling air. This study is intended to predict the performance of each component at design step or to simulate the system when specification of the component is modified, and to analyze the performance of the total vehicle engine cooling system.

An Investigation about Combustion and Emission Characteristics for Pilot Injection Timing on Partially Premixed Charge Combustion Ignition Engine Fueled with DME (파일럿 분사시기에 따른 DME 부분 예혼합 압축착화 엔진의 연소 및 배기특성에 관한 연구)

  • Jeong, Jaehoon;Lim, Ocktaeck;Pyo, Youngduck;Lee, Youngjae
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.3
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    • pp.43-49
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    • 2013
  • This work investigated the effects of engine speed and injection timing on combustion and emissions characteristics in a partially premixed charge compression ignition (pPCCI) engine fueled with DME. pPCCI engine especially has potential to achieve more homogeneous mixture in the cylinder, which results in lower NOx and smoke emission. In this study single cylinder engine was equipped with common rail and injection pressure is 700 bar. Total injected fuel mass is 64.5 $mm^3$ per cycle. The amount of pilot injection of the entire injection 12.5% is tested. Results show that NOx emission is decreased while IMEP is increased as the retard of injection timing. Besides, NOx emissions are slightly rised as well as IMEP is increased with the increase of engine speed.

A Study on Reductions of Cold Start Emissions with Syngas Assist in an SI Engine (합성가스를 첨가한 SI 엔진의 냉간시동 유해 배기가스 저감에 관한 연구)

  • Song, Chun-Sub;Ka, Jae-Geum;Hong, Woo-Kyung;Park, Jeoung-Kwon;Cho, Yong-Seok;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.4
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    • pp.114-120
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    • 2011
  • Fuel reforming technology for the fuel cell vehicles has been frequently applied to internal combustion engine for the reduction of engine out emissions. Since syngas which is reformed from fossil fuel has hydrogen as a major component, it has abilities to enhance the combustion characteristics with wide flammability and high speed flame propagation. In this paper, syngas was feed to a 2.0 liter SI engine with MPI to improve exhaust emissions under cold start and early state of idle condition. Syngas fraction is varied to 0%, 10%, 25%, with various ignition timings. Exhaust emission characteristics and the exhaust system temperature were measured to investigate the effects of syngas addition on cold start. Result showed that HC emission could be dramatically reduced due to the fact that syngas has $H_2$ and no HC as components. The amount of $NO_x$ emission was decreased with the increase of syngas fraction. Because the dilution effect of $N_2$ and the retard of ignition timing reduces the peak combustion temperature inside the cylinder. Exhaust gas temperature was lower than that of gasoline feeding condition. Retarded ignition timing, however, resulted in increased exhaust gas temperature approximated to gasoline condition. It is supposed that the usage of syngas in an SI engine is an effective solution to meet the future strict emission regulations.

A Study on Clutch-disc Characteristics for the Torsional Vibration Reduction of the Drive-Line at Creeping (최저속주행시 동력전달계의 비틀림진동 저감을 위한 클러치특성 연구)

  • Chung, T.J.;Hong, D.P.;Kim, S.S.;Kim, S.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.2
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    • pp.102-111
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    • 1995
  • The non-periodic fluctuation of the engine torque appears to be the major source of the torsional vibration of the automotive driveline. The reduction of this torsional vibration has become a significant problem along with the requirements of higher performance. The torsional vibration of the automotive driveline can be reduced by smoothing the fluctuation by adjusting the torsional characteristics of the clutch-disc. Computer simulation of the driveline is a useful investigative tool on studying the torsional characteristics of the clutch-disc. In this paper, a dynamic model for the automotive driveline was developed, and the engine torque of the model were evaluated with experimental data. By executing a simulation using the model, it has become possible to obtain the clutch-disc torsional characteristics for reducting the torsional vibration at creeping.

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A Numerical Study on Combustion Characteristics of Single Cylinder Engine Fueled with DME (DME를 사용한 단기통 엔진의 연소특성에 관한 수치해석적 연구)

  • Kim, Hyun-Chul;Kang, Woo;Na, Byung-Chul;Kim, Myung-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.4
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    • pp.39-48
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    • 2006
  • In this research, in order to study the spray, combustion, and emission characteristics of the common rail DME engine, the target engine was disassembled, and 3D CAD file was constructed using a 3D measurement machine and a rapid prototyping machine. Using the obtained 3D geometry, fine moving meshes are generated, and three dimensional non-steady turbulence flow field and combustion phenomenon including spray were numerically analyzed. As a result, IMEP of DME and diesel in medium and high speed revolution showed similar performance. As the DME fuel start to burn in spray area, the vaporized fuel rapidly spreads squish area in low speed revolution. In the case of DME engine, CO and NOx are relatively consistent with experiment results. It was found that the break-up, evaporation, collision model of DME fuel need to be properly adjusted through matching the characteristics of fuel and injector for further improvement.

A Study on the Effects of Diesel Engine Deterioration on Exhaust Gas Emission (대형디젤기관의 열화에 따른 배출가수 특성에 관한 연구)

  • Kim Kiho;Ahn GyunJae;Gang GeumWon;Lee TaeYoung;Eom DongSeop;Lim YunSung
    • Journal of Korean Society for Atmospheric Environment
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    • v.21 no.6
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    • pp.585-592
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    • 2005
  • Nowadays it has been strongly required to control emissions from vehicles specially in diesel engines because of increasing number of vehicle in korea. This research aims to provide with some of deterioration factors on vehicles for emissions characteristics and the test was done on an electronically controlled heavy-duty diesel engine under severe driving conditions such as 1200 driving hours, 220,000 km driving distance and a full load. Under various driving conditions, CO, HC, $NO_{x}$, PM and Soots emissions were estimated under D-13 mode and D-3 mode respectively. CO emission was not changed until 500 running hours, and as engine aging is progressed THC was not changed until 500 running hours but it decreased to about $33\%,\;NO_{x}$ decreased constantly but on the other hand PM increased up to $6.9\%$ during the aging process.