• 제목/요약/키워드: Automotive Engine Oil

검색결과 258건 처리시간 0.024초

피스톤 냉각용 오일제트 비정상 유동 해석 (Unsteady Flow Analysis of Oil Jet for Cooling the Piston)

  • 권지혁;이연원;김재환
    • 한국자동차공학회논문집
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    • 제16권2호
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    • pp.1-7
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    • 2008
  • In order to enhance the performance of an automotive engine, many researchers have been carried out. An oil jet cooling a piston is one of important parts for engine performance. Therefore, the efficient cooling system of an oil jet is needed. In this paper, unsteady flow analysis of the oil jet which consists of a check valve and a nozzle has been accomplished. And the reaction between mass flow rate and ball movement was also investigated.

COMBUSTION CHARACTERISTICS OF ESTERIFIED RICE BRAN OIL AS AN ALTERNATIVE FUEL IN A DIESEL ENGINE

  • Choi, S.H.;Oh, Y.T.
    • International Journal of Automotive Technology
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    • 제7권4호
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    • pp.399-406
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    • 2006
  • The smoke emission of diesel engines is being recognized as one of the major source of the air pollution problems. This study investigates the potential of esterified rice bran oil to reduce smoke emission as an alternative fuel for diesel engines. Because the esterified rice bran oil has approximately a 10.5% oxygen content, the combustion of the diesel engine improved and exhaust smoke decreased. Gas chromatography was used to analyze not only the total amount of hydrocarbon but also the amount of hydrocarbon components from $C_1$ to $C_6$ in the exhaust gas to determine an exact source responsible for the remarkable reduction in the smoke emission. The number of individual hydrocarbon($C_1{\sim}C_6$) as well as the total amount of hydrocarbon of esterified rice bran oil reduced significantly compared to that of hydrocarbon of diesel fuel.

오일필터 일체형 엔진오일퇴화감지센서 시작품 개발II (The Prototype Development II of an Engine Oil Deterioration Sensor Installed Inside an Oil Filter)

  • 전상명
    • Tribology and Lubricants
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    • 제24권4호
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    • pp.170-178
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    • 2008
  • In this paper, it is described how the problems appeared at the previous proto type sensor are improved. As changing the pressure and temperature of engine oil in a test rig, the modified sensor is tested. Then, the measured results of capacitance and the corresponding dielectric constants under various temperatures and pressures are shown. It turns out that the electrical signal gotten from the electrodes of newly developed sensor can be more stable under the various operating conditions.

Tilting Test Rig를 이용한 엔진 윤활 시스템 안정성 평가 (Safety Estimation of Engine Lubrication System using Tilting Test Rig)

  • 윤정의;전문수
    • 한국자동차공학회논문집
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    • 제10권4호
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    • pp.1-6
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    • 2002
  • Engine lubrication system is generally affected by vehicle driving conditions, which are composed of acceleration, braking deceleration and accelerating during cornering. The major reason is due to the oil pan system in which oil is directly influenced by inertia farce caused by vehicle driving conditions. Therefore, to confirm safety of engine lubrication system inertia farce effects are also considered in the developing state. For the purpose, we have carried the engine tilting tests using ourselves made test rig. Verifying the test results we also measured the inertia effects on the engine lubrication system using the circular tuning and slalom test with vehicle. Through the comparison study between two kinds of results we obtained that the engine tilting test rig was very useful to confirm the safety evaluation of engine lubrication system.

대형 LPG 엔진의 흡입 스월비에 따른 연소성능에 관한 연구 (The Effect of Intake Swirl Ratios on Combustion Performance in a Heavy-Duty LPG Engine)

  • 한병주;김창업;강건용;이창식
    • 한국자동차공학회논문집
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    • 제9권5호
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    • pp.46-53
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    • 2001
  • To optimize the intake flow condition in the heavy-duty LPG SI engine, five different swirl ratios of intake port were investigated experimentally by oil spot method, LDV and single cylinder engine test. The flow characteristics near the piston surface were observed by oil spot method and magnitudes of swirl flow were measured quantatively by LDV method in the steady flow rig. The engine performances of various swirl flow were also tested with the heavy-duty LPG SI single cylinder engine. In the results, high swirl ratio, above $R_s$=2.3, was not suitable to develope a stable flame kernel and to produce high engine performance. Especially it was more serious under lean burn conditions, since turbulence intensity was smaller than bulk flow though those are increased together. These results were also confirmed by LDV measurement and oil spot method. On the contrary, low swirl ratio($R_s$=1.3) is not good to propagate a flame since the turbulence intensity and bulk flow are vanished during compression stroke and low swirl ratio has too weak initial energy for stable combustion. Therefore, the of optimized swirl ratio f3r the heavy-duty LPG engine in this work was found around $R_s$=2.0.

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디젤기관의 대체연료 이용에 관한 연구(III) (에스테르 연료, 연소특성해석) (A Study on Alternative Fuel as Fuel Substitutes in DI Diesel Engine III (Esterified fuel, Analysis of rate of combustion using by Wiebe's functions))

  • 오영택;정규조;촌산정
    • 오토저널
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    • 제11권1호
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    • pp.31-43
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    • 1989
  • 제2보 (2)에서는 식물유를 연료로 사용할 경우 문제점인 시동성, 내구성 및 카본생성을 억제하기 위하여 물리적인 방법으로 해결책을 모색하였다. 그러나, 본 연구는 기관자체는 전혀 변형시키지 않고, 점도저감을 위하여 화학적인 방법 즉, 식물유를 알콜과 반응시켜 에스테르변 환을 하여 해결하려는 방법으로, 에스테르화한 연료를 사용하였을 때의 기관성능 및 카본 퇴적 문제를 비교, 시험한 것이다. 또, 기름이 식물유와 같이 지방산으로 이루어져 있다면, 어느 기름도 에스테르 변환이 가능하기 때문에, 생선기름인 정어리기름의 에스테르연료도 사용하여 그 이용 가능성을 확실히 하였다. 또한, 각종 연료의 연소성에 관하여 보다 상세한 검토를 하기 위하여, 이들의 연소율 파형을 2개의 Wiebe의 연소함수의 조합으로 표현함과 동시에 연소율 파형을 구성하는 각 변수를 해석함으로써, 기관성능치와 연소성과의 정량적인 관계에 대해서도 조사한 것이다.

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유한요소법에 의한엔진 구조소음 해석 (An Engine Structure-Borne Noise Analysis by Finite Element Method)

  • 안상호;김주연;김규철
    • 한국자동차공학회논문집
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    • 제6권1호
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    • pp.122-133
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    • 1998
  • This paper presents the static analysis, the modal analysis and the forced vibration analysis on engine structures to find out the structure-borne noise sources by finite element method. The deformation of engine structures under the maximum combu- stion gas force was calculated through the static analysis, and the resonance possibilities were predicted by the modal analysis which ascertains mode shapes and the corresponding frequencies of engine global and its major noise sources in engine surfaces were investigated with the forced vibration analysis by means of finding the transfer mobilities on engine surfaces due to the piston impact and the velocity levels due to the combustion in consideration of oil film stiffness and damping coefficients. Finally, the direction of engine structure-borne noise reduction can be estabilished by the above-mentioned analysis procedure and the reduction effect of cost on proto-type engine build-up is expected.

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오일유막의 연료 흡수 및 방출에 관한 연구 (Modeling of Absorption/Desorption of Fuel in Oil film on the Cylinder Liner in SI Engines)

  • 유상석;민경덕
    • 한국자동차공학회논문집
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    • 제7권9호
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    • pp.165-171
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    • 1999
  • An oil layer fuel absorption /desorption modeling was developed. Multi-component fuel model has showed more reasonable condition than single component model. Henry's constant which is related to solubility is the most important variable in the oil layer absorption/desorption mechanism. The oil segments close to the top of the cylinder liner have more significant contribution to the fuel absorption and desorption process than other oil segments. At the warmed-up condition, the effect of the engine speed on the precent fuel absorbed/desorbed is minimal. But at low il film temperature, percent of fuel abosrbed/desorbed is decreased with increasing the engine speed because of low value of molecular diffusion coefficient of fuel. The amount of fuel trapped in the piston crevice is from 2 to 2.3 times larger than that of fuel in the oil fim. However, fuel form oil film slowly desorbs into the combustion chamber compared with fuel from the piston crevices when the engines is cold.

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엔진 CON-ROD베어링 내 SCUFFING성 향상에 관한 연구 (A study for improvement of engine bearing reliability based on temperature analysis)

  • 최재권;이정현
    • 오토저널
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    • 제14권2호
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    • pp.110-119
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    • 1992
  • Crank pin temperatures were measured and analyzed to find out practical method which can predict the engine bearing reliability. The measuring points were determined to be near the MOFT region and far from that by theoretical calculation. The effect of engine running condition, oil temperature, the change of oil circuit into bearing and crankshaft endplay on crank pin temperature were experimentally tested. The result obtained was as following. The crank pin temperature was dependent on oil film thickness and directly influenced by the change of test condition. Also, the length of the crankshaft endplay was confirmed to be critical to connecting rod bearing failure. In conclusion, we found that the measurement method of crank pin temperature can be used for predicting the engine bearing reliability.

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딥스틱게이지형 소형 엔진열화감지센서 개발 (Development of a Dipstick Gage Type Small Engine oil Deterioration Detection Sensor)

  • 전상명
    • Tribology and Lubricants
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    • 제29권2호
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    • pp.77-84
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    • 2013
  • A small engine-oil-deterioration detection sensor was developed and installed at the tip of a dipstick gage. The sensor part was manufactured using printed circuit board (PCB) manufacturing technology. A set of sensor covers was installed in order to protect the sensor and realize good signal stability. The small engine-oil-deterioration detection sensor system comprised a dual sensor having etched copper electrodes coated with gold and ceramic, a flexible PCB (FPCB) acting as electric wire, and a dummy PCB with only a lock connector. The sensor can easily be installed by insertion through the guide tube of a dipstick gage. Thus, a driver can easily handle it without further installation equipment. The sensor can determine the level of deterioration in the engine oil by estimating the corresponding dielectric constant of the engine oil.