• Title/Summary/Keyword: 솔레노이드 구동 인젝터

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Analysis of Fast Injection Response Characteristics Between Solenoid and Piezo-Driven Injector (솔레노이드 및 피에조 인젝터의 고속분사 응답성 해석)

  • Jo, In-Su;Lee, Jung-Hyup;Lee, Jin-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.10
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    • pp.971-977
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    • 2012
  • It is well known that the performance of a diesel injector is directly related to the power, emission, and fuel consumption of the diesel combustion engine. In this study, the injection response characteristics of CRDi injectors driven by a solenoid coil and a piezoceramic were investigated by using the AMESim simulation code. Some analytical parameters such as the fuel pressure and hole diameter were considered. From this study, it was shown that the piezo-driven injector had a faster response and had better control capability than the solenoid-driven injector. In addition, it was found that the piezo-driven injector can be utilized more effectively in a multiple injection scheme than a solenoid-driven injector.

Comparison of Pilot Spray Characteristics of HP Diesel Injectors with Different Driving Method for CRDi System (II) (커먼레일 직접분사(CRDi)용 고압 디젤인젝터의 구동방식별 Pilot Spray 특성비교(II) - 솔레노이드 및 피에조 구동방식 비교분석 -)

  • Lee, Jin-Wook
    • Journal of ILASS-Korea
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    • v.15 no.2
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    • pp.67-73
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    • 2010
  • The capability of pilot injection with small fuel quantity at all engine operating conditions is one of the main feature of the common rail direct injection system. The purpose of the pilot injection is to lower the engine noise and to reduce the NOx emissions. This study describes the pilot spray structure characteristics of the common-rail diesel injectors with different electric driving characteristics, including solenoid-driven and piezo-driven type. Namely three common-rail injectors with different electric current wave were investigated in this study. The pilot spray characteristics such as spray speed, spray tip penetration, and spray angle were obtained by spray images, which is measured by the back diffusion light illumination method with optical system for high-speed temporal photography. As this research results, it was found that pilot injection of common-rail system was effected by rate of injection with different electrical characteristic for injector driving.

Comparison of Pilot Spray Characteristics of HP Diesel Injectors with Different Driving Method for CRDi System (I) (커먼레일 직접분사(CRDi)용 고압 디젤인젝터의 구동방식별 Pilot Spray 특성비교 (I) - 실제 직접분사식 디젤엔진에서의 사전분사 특성 분석 -)

  • Lee, Jin-Wook
    • Journal of ILASS-Korea
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    • v.15 no.1
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    • pp.25-30
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    • 2010
  • The capability of pilot injection with small fuel quantity at all engine operating conditions is one of the main feature of the common rail direct injection system. The purpose of the pilot injection is to lower the engine noise and to reduce the NOx emissions. This study describes the pilot spray structure characteristics of the common-rail diesel injectors with different electric driving characteristics, including solenoid-driven and piezo-driven type. Namely three common-rail injectors with different electric current wave were investigated in this study. The pilot spray characteristics such as spray speed, spray tip penetration, and spray angle were obtained by spray images, which is measured by the back diffusion light illumination method with optical system for high-speed temporal photography. As this research results, it was found that pilot injection of common-rail system was effected by rate of injection with different electrical characteristic for driving the injector.

Analysis of the Driving Performance in Piezo Injector for Clean Diesel Engine (친환경 디젤엔진용 차세대 피에조 인젝터의 구동성능 해석)

  • Lee, Jin-Wook;Kang, Kern-Yong;Min, Kyoung-Doug
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.33-34
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    • 2006
  • In this study, a prototype piezo-driven Injector. as a new method driven by piezoelectric energy, has been designed and fabricated based on the concept of inverse piezo-electric effect to overcome the major drawbacks of conventional solenoid-driven injector with a fixed and slow control of injection rate. The effects of an electric control between the solenoid valve and piezo-ceramic stack for injector needle's driving on the dynamic characteristics were usually investigated. We found that this piezo-electric actuator has the main advantage to drastically reducing the time of injector nozzle opening, as well to exert higher force output levels.

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Performance Prediction of solenoid Actuated Hydrogen Injector (솔레노이드 구동 수소인젝터의 성능예측)

  • 이형승;이용규;김한조;김응서
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.1
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    • pp.174-185
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    • 1997
  • The performance of the solenoid actuated hydrogen injector and the capacitive peak-hold type driving circuit was predicted through the modeling of the injector and the driving circuit the modeling was composed of the driving circuit, the solenoid, the moving parts of the injector, and the hydrogen injection system. The performance of the injector through the modeling was compared with the results of the solenoid and injector rig tests, and those were consistent with each other. Through the prediction of the injector performance, the effects of the components such as electrical resistor, capacitor, and injector spring are easily known to the injector performance required.

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Characteristics of Solenoid Actuated Hydrogen Injector (솔레노이드 구동 수소인젝터의 성능특성)

  • Yi, H.S.;Kim, H.J.;Kim, E.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.6
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    • pp.134-144
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    • 1995
  • The solenoid actuated hydrogen injector and the capacitive peak-hold type driving circuit were designed and made, and the hydrogen supply system for in-cylinder injection was constructed with these. The performance of the injector was investigated through measuring the pintle lift profiles and the injection quantities, and the performance of the hydrogen supply system was confirmed through the experiments at the single cylinder engine. The injection quantity increased linearly as the duration of driving signal increased. At the single cylinder engine, the hydrogen injector was operated stably. The hydrogen flow rate of the injector with the peak-hold type driving circuit could be controlled precisely at high engine speed or low load condition only with the variation of signal duration.

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Comparison on Spray Characteristics of Diesel HEV Injectors for 3-different Driving Type (SI, PI, DPI) (3개 구동방식(SI, PI, DPI)별 디젤HEV용 인젝터의 분무 특성 비교)

  • Chung, M.C.;Sung, G.S.;Kim, S.M.;Lee, J.W.
    • Journal of ILASS-Korea
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    • v.19 no.1
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    • pp.9-14
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    • 2014
  • Performance of DI diesel engine with high-pressure fuel injection equipment is directly related to its emission characteristics and fuel consumption. So, the electro-hydraulic injector for the common-rail injection system should be designed to meet the precise high fuel delivery control capability. Currently, most high pressure injector in use has a needle driven by the solenoid coil energy or the piezo actuator controlled by charge-discharge of output pulse current. In this study, macroscopic spray approaching method was applied under constant volume chamber to research the performance of three different injectors : solenoid, indirect-acting piezo and direct-acting piezo type for CR direct-injection. LED back illumination for Mie scattering was applied on the liquid spray visible of direct-acting piezo injector, including hydraulic-servo type solenoid and piezo-driven injectors. As main results, we found that a direct-acting piezo injector had better a spray tip penetration than hydraulic-servo injectors in spray visualization.

A Computer Simulation of Injection Rate Characteristics of Solenoid Type Common Rail Injector According to Injector Driving Current Patterns (인젝터 구동 전류 패턴 변화가 솔레노이드 타입 커먼레일 인젝터 분사율 특성에 미치는 영향에 대한 컴퓨터시뮬레이션)

  • Lee, Choong Hoon
    • Journal of ILASS-Korea
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    • v.24 no.3
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    • pp.114-121
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    • 2019
  • The effect of injector driving current pattern on fuel injection rate of solenoid diesel common rail injector was studied by computer simulation. The time resolved fuel injection rate and injected quantity per stroke of a common rail injector driven with the five current patterns were computer simulated. The fuel injection rate and injected quantity per stroke according to the rail pressure and fuel injection period were also computer simulated. When the common rail injector was driven with the five driving current patterns of peak & hold, there was no difference in the fuel injection rate in the peak section regardless of all the current patterns of the five cases. On the other hand, the magnitude of the hold current value influenced the injection rate and injected quantity per stroke. That is, in the current pattern of three cases where the hold current value is equal to or more than a constant value of the peak current value, the fuel injection rates for the given common rail rail pressure and injection period are same one another. On the other hand, the current pattern of the two cases, in which the hold current value is smaller than a certain value, there is a large fluctuation in the fuel injection rate.

Effect of Injector-driven Type on Spray Behavior and Fuel Atomization Characteristics (인젝터 구동 방식에 따른 분무 거동 및 분무 미립화 특성)

  • Park, Ji-Hong;Suh, Hyun-Kyu;Park, Sung-Wook;Kim, Jae-Wook;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.1
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    • pp.17-24
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    • 2006
  • This study was performed to figure out spray behavior and fuel atomization characteristics of a piezo-driven injector and a solenoid-driven injector in the common-rail injection system under the same design parameters and test conditions. The process of spray injection was visualized by using the spray visualization system composed of a Nd:YAG laser and an ICCD camera. The atomization characteristics were investigated in terms of axial mean velocity, Sauter mean diameter(SMD) and droplet distributions obtained from a phase Doppler particle analyzer system. Compared with solenoid-driven injector, the piezo-driven injector has short injection delay and reaches quickly to the maximum injection value. Spray tip penetration shows some difference, however, spray angle of piezo-driven injector is wider than that of solenoid-driven injector. Sauter mean diameter of piezo-driven type injector is smaller than that of solenoid-driven type.

Analysis of Macroscopic Spray Characteristics of Diesel Injectors with Three Different Needle Driving Type in Common Rail Direct Injection System (3가지 니들구동방식별 CRDi 디젤엔진용 고압 인젝터의 거시적 분무특성 비교해석)

  • Lee, Jin-Wook;Min, Kyoung-Doug
    • Journal of Advanced Marine Engineering and Technology
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    • v.30 no.3
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    • pp.351-358
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    • 2006
  • The capability of high pressure injection with small fuel quantify at all engine operating conditions is one of the main feature in common rail fuel injection system, which is used in small and light-duty Diesel engine. The key parameter for the better atomized fuel sprays and multiple injections of this common rail fuel injection control, that can be freely selected irrespective of the engine speed and load is the mechanism controlling the needle energizing and movement in high pressure Diesel injector. In the electro-hydraulic injector, the injection nozzle is being opened and closed by movement of the injector's needle which is balanced by pressure between the nozzle seat and the needle control chamber. This study describes the macroscopic spray structure characteristics of the common rail Diesel injectors with different electric driving method i.e. the solenoid-driven and piezo-driven type. The macroscopic spray characteristics such as spray tip speed. spray tip penetration and spray cone angle were investigated by the high speed spray, which is measured by the back diffusion light illumination method with optical system for the high speed temporal photography in a constant volume chamber pressurized by nitrogen gas. As the results, the prototype piezo-driven injector system was designed and fabricated for the first time in domestic case and the effect of injector's needle response driven by different drive type was compared between the solenoid and piezo-driven injector It was found therefore. that the piezo-driven injector showed faster needle response and had better needle control capability by altering the electric input value than the solenoid-driven injector.