• Title, Summary, Keyword: Inlet Valve

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A Study on Exhaust Gas Characteristics and Engine Performance of EGR Valve Installed Engine for Development of EGR Valve Test System (EGR 밸브 평가 장치 개발을 위한 EGR 장착 엔진 성능 및 배출 가스 특성 연구)

  • Na, D.H.;Ko, C.S.;Seo, H.J.;Lee, C.E.
    • Journal of Drive and Control
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    • v.9 no.4
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    • pp.52-57
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    • 2012
  • In this study, in order to understand contents and ranges of design for the EGR Valve test system for improving quality and performance of EGR Valve, engine performance and exhaust gas characteristic of 3L-class diesel engine was analyzed. Experimental operation of engine performance test was performed with 50% engine load and 20% and 100% opening ratio of EGR Valve. From test of performance and exhaust gas characteristic of engine, torque output of engine and temperature and pressure of inlet and outlet of EGR Valve were measured. As a result, for design of EGR Valve test system, input fluid flow of EGR Valve must be set the same amount with exhaust gas flow that was below of engine speed of 2,500 rpm, and temperature of inlet of EGR Valve must be set under about $510^{\circ}C$. And the difference of temperature between inlet and outlet of EGR Valve must be over than about $200^{\circ}C$. Exhaust gas of inlet and outlet of EGR Valve were under 1 bar that was not considerable, and the difference of pressure between inlet and outlet of EGR Valve were under 1 bar that could not effect on mechanical operation of EGR Valve.

Study on Structural Safety Analysis of EGR Valve (EGR Valve의 구조 안전성 해석에 관한 연구)

  • Han, Moon-Sik;Cho, Jae-Ung
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.5
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    • pp.528-534
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    • 2011
  • This study analyzes thermal stress and durability fatigue on the modelling of EGR valve. In case of 10% opening at its inlet, the minimum temperature gets cool as 3 times as inlet temperature. The maximum equivalent stress becomes lowest as the value of $2.6274{\times}109$ Pa and fatigue life becomes highest as 23.657 Cycle. But the minimum temperature gets cool as 2.2 times as inlet temperature in case of 50% opening at its inlet. The equivalent stress becomes higher and fatigue life becomes lower than in case of 10% opening. In case of 100% opening at its inlet, the minimum temperature gets cool as 0.2 times as inlet temperature. The equivalent stress becomes lower and fatigue life becomes higher than in case of 50% opening. Maximum equivalent stress and total deformation are shown at the closing of EGR valve by the pressure of inflow gas. The structural analysis result of this study can be effectively utilized with the design of EGR valve by investigating prevention and durability against its damage.

Effect of Inlet Valve Angle on In-Cylinder Swirl. Generation Characteristics(II) (흡입밸브 각이 실린더 내 와류 발생 특성에 미치는 영향(II))

  • Ohm, In-Yong;Park, Chan-Jun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.2
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    • pp.42-48
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    • 2009
  • This paper is the second of 2 companion papers which investigate in-cylinder swirl generation characteristics according to inlet valve angle. Two DOHC 4 valve engines, one has wide intake valve angle and the other has narrow valve angle, were used to compare the characteristics of swirl motion generation in the cylinder. One intake port was deactivated to induce swirl flow. A PIV (Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during intake stroke. The results show that the flow patterns of narrow valve engine are much more stable and well arranged compared with the normal engine over the entire intake and compression stroke except early intake stage, and very strong swirl motion is generated at the end of compression stage in this engine nevertheless using straight port which is unfavorable for swirl generating. In the wide valve angle one, however, strong swirl motion induced during intake stroke is destroyed as the compression progresses.

Effect of Inlet Valve Angle on In-Cylinder Swirl Generation Characteristics(I) (흡입밸브 각이 실린더 내 와류 발생 특성에 미치는 영향(I))

  • Ohm, In-Yong;Park, Chan-Jun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.6
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    • pp.148-156
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    • 2008
  • This paper is the first of 2 companion papers which investigate in-cylinder swirl generation characteristics according to inlet valve angle. Two DOHC 4 valve engines, one has wide intake valve angle and the other has narrow valve angle, were used to compare the characteristics of swirl motion generation in the cylinder. One intake port was deactivated to induce swirl flow. A PIV (Particle Image Velocimetry) was applied to measure in-cylinder velocity field according to inlet valve angle during intake stroke. The results show that the stronger swirl motion is observed in wide valve angle engine at the early intake stage; however, the swirl motion is gradually distorted by the intake flow component passing through valve area near the cylinder wall as the stroke proceeds. The tumble motion also does so in wide angle. On the contrary, the swirl and tumble motions, which are not clear at the initial stage, become better and better arranged as the piston goes down and up again after bottom dead center.

Part Load Performance Characteristics according to Inlet Valve Angle (흡입 밸브 각도에 따른 엔진 부분부하 성능 특성)

  • Lee, Jung-Man;Lee, Jae-Won;Kim, Hyeong-Sig;Kwon, Soon-Tai;Park, Chan-Jun;Ohm, In-Yong
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.161-166
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    • 2008
  • This paper searched through mixture ratio response test whether exert effect that is some in part load performance of engine according to inlet valve angle in gasoline engine. Engines that inlet valve angle is narrow decreased quantity of NOx among exhaust gas than engine that inlet valve angle is wide, and ignition timing was retard, and fuel consumption improved a little. That quantity of NOx among exhaust gas decreases and ignition timing was retard can judge that fast burning occurred. Fast burning can decrease output decline and misfire that can happen at lean burning. Can be judged by thing which engine's combustion performance improves if inlet valve angle is narrow if examine test result.

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Analysis on Volumetric Efficiency and Torque Characteristics Using Inlet Port Pressure in SI Engines (흡기포트압력을 이용한 SI엔진의 체적효율 및 토크 성능 분석)

  • 이영주;홍성준
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.7
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    • pp.1408-1418
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    • 1992
  • The valve timing and intake system in SI engine is chosen in order to get the maximum performance at the target rpm. This is a compromise and the performance reduction is expected in a certain rpm range. Therefore, to accomplish the possible engine capacity all over the operation ranges, it is required to investigate the effects of intake system and valve timing on engines more thoroughly. In this paper, it was attempted to examine closely the combined effects on the torque and the volumetric efficiency due to the change of valve timing and intake system dimensions. For this, the inlet port pressure was chosen as a primary parameter to represent engine performance characteristics together with surge tank pressure and induction pressure as secondaries. The inlet port pressure was analyzed in connection with both the secondaries and the performance data. Especially the relation between the inlet port pressure and the torque and volumetric efficiency was investigated on the operating conditions. In this experiment, it was acquired that the performances at specific rpm range could be improved by the combinations of valve timing and intake system. Then it was verified that pressure at a intake system contained useful data for the engine performance. By the analysis of inlet port pressure with the others, it was obtained that the properties of the torque and the volumetric efficiency due to the change of valve timing and intake conditions were able to be defined by the average and the maximum inlet port pressures, the pressure near before the intake valve closing(IVC) point as well as the pressure at IVC point during the intake valve opening duration. These results could be applied to almost all over the experimental conditions.

EFFECT OF THE DIFFERENTIAL PRESSURE BY THE BLOW-BY GAS FLOW ON THE PCV VALVE WITH A CRACK

  • Song, S.M.;Kwon, O.H.;Lee, Y.W.
    • International Journal of Automotive Technology
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    • v.8 no.2
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    • pp.219-224
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    • 2007
  • Recently, atmospheric contaminations has become worse due to the increased number of automobile. The PCV (Positive Crankcase Ventilation) valve acts as a flow control to allow re-combustion of blow-by gas by having it flow from a crankcase to an inlet manifold suction tube. Also, during the fabrication of the PCV valve, micro cracks may occur in the valve body and be extended under operation. The excessive stress distribution and crack initiation on the PCV valve body would bring an unstable blow-by gas flow rate control and would cause valve failure. The purpose of this study is to examine the crack affects on the stress and strain variations on the PCV valve according to the inlet and outlet manifold under differential pressures. From the results, we can explain the behavior of the crack extension for a safe condition of PCV valve.

High-output Piezoelectric Micropump Using Active Check Valves (능동형 체크 밸브를 이용한 고출력 압전 마이크로펌프)

  • Park, Jung-Ho;Yoshida, Kazuhiro;Yokota, Shinichi;Ham, Young-Bog;Yun, So-Nam
    • Proceedings of the KSME Conference
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    • pp.1864-1869
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    • 2003
  • A novel piezoelectric micropump using active check valves in place of conventional passive check valves in inlet and outlet has been proposed and investigated. It actively controls open/close motion of check valves using piezoelectric actuator for expansion/contraction of pump chamber. In this paper, bi-directional flow characteristics and load characteristics are experimentally investigated using an adequate timing control for valve closing motion with a prototype micropump fabricated with the effective size of $17{\times}8{\times}11mm^{3}$. From the experimental results, it is ascertained that optimal values of phase shift against voltage to drive pump chamber for realization of a miniaturized but powerful micropump, are $15^{\circ}$ in inlet check valve and $195^{\circ}$ in outlet. Based on the obtained results, a sheet-type active shuttle valve that has a unified valve-body for inlet and outlet check valves is proposed. A micropump with the effective size of $10{\times}10{\times}10mm^{3}$ is fabricated and basic characteristics are experimentally investigated.

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A High Power Micropump Using Active Check Valves Driven by Piezoelectric Actuators (압전구동 능동형 체크밸브를 이용한 고출력 마이크로펌프)

  • Kang, Jung-Ho
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.4
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    • pp.39-47
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    • 2005
  • In this paper, a novel high power micropump using active check valves in place of conventional passive check valves employed at the inlet and outlet ports is presented. It actively controls open/close motion of check valves using piezoelectric actuator for expansion/contraction of pump chamber. A prototype micropump having an effective size of $17mm{\times}8mm{\times}11mm$ is fabricated. Frequency-dependent flow rate characteristics, bi-directional flow characteristics and load characteristics are experimentally investigated using a timing control method for valve closing motion. From the obtained experimental results, it is ascertained that optimal values of the phase shift compared to the voltage to drive pump chamber are $15^{\circ}$ for inlet check valve and $195^{\circ}$ for outlet. Based on the obtained results, a sheet-type active shuttle valve that has a unified valve-body for inlet and outlet check valves is proposed. A micropump with an effective size of $10mm{\times}10mm{\times}10mm$ is fabricated and the basic characteristics are experimentally investigated.

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Prediction of Cavitation Occurrence in a Cryogenic Butterfly Valve by Flow Velocity (극저온 버터플라이 밸브의 유속에 따른 캐비테이션 발생 예측)

  • Kim, Seong-Dong;Kim, Beom-Seok;Choi, Young-Do;Lee, Young-Eo
    • Journal of the Korean Society of Marine Engineering
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    • v.32 no.6
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    • pp.923-930
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    • 2008
  • The butterfly valve is widely used in the industrial field as an on-off or a flow control valve. When the butterfly valve is used as a flow control valve. cavitation sometimes occurs in the range of high flow rate because of the small valve opening. Therefore. the pressure loss and the cavitation characteristics are investigated by use of a commercial CFD code. The results show that the possibility of cavitation occurrence in the cryogenic butterfly valve is very high in the case of valve opening angle below 10 degree and incident velocity over 6m/s. By increasing the inlet velocity at 10 degree of valve opening angle. the value of loss coefficient increased. However. by increasing the inlet velocity at 50 degree of valve opening angle. the value of loss coefficient decreased.