• Title/Summary/Keyword: Solenoid Injector

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A Study on Performance Change of Gas Injector with Ambient Temperature Environment (주변 온도환경 변화에 따른 가스 인젝터 성능 변화에 대한 연구)

  • Kim, Ji-Yoon;Yang, Jeong-Jik;Kim, Jin-Ho;Seo, Ii-Won;Lim, Jong-Wan
    • Journal of the Korean Institute of Gas
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    • v.22 no.5
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    • pp.18-23
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    • 2018
  • This study tries to analyze the injection amount of injector according to the external environment temperature of CNG vehicle. Especially, We investigated the effect of low temperature environment on gas injector performance by measuring the variation of injection amount under the same conditions as in coldstart condition. This experimental compared two products with different spring characteristics. The experimental device consist of a fuel supply unit, a flowrate measurement unit, a temperature chamber, and an injector control unit (ECU). According to the test result, the initial injection amount of the injector is increased in the low temperature environment and the needle opening time is delayed according to the change of the spring length.

Analysis on Combustion Characteristics of CRDi Single-cylinder Diesel Engine with Direct Needle-driven Piezo Injector (직접구동 피에조 인젝터의 CRDi 단기통 디젤엔진 연소 특성 분석)

  • Chung, Myungchul;Sung, Gisu;Kim, Sangmyung;Lee, Jinwook
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.5
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    • pp.108-115
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    • 2014
  • In this study, experimental approaching method was applied under and single-cylinder engine to research the performance of direct needle-driven piezo injector (DPI) for CR direct-injection. As key-point factor of this DPI that relies on direct-acting operating of injector needle, unlike conventional hydraulic-servo, its nozzle needle can be directly driven by piezo actuator. Thus, effect of direct-acting injection of DPI on diesel combustion and emission characteristics was investigated under common-rail single-cylinder direct-injection engine, equipped with three different driving mechanism, including indirect-acting solenoid, piezo and DPI system. As main results, it found that a direct-acting piezo injector has higher of IMEP. And it has higher heat release rate during premixed combustion and mixing controlled combustion phase due to its higher heat release, even though nitrogen oxide (NOx) formations were increased slightly.

Analysis of Sensitivity Characteristics with AMESim Model for Piezo Injector (AMESim기반 피에조 인젝터용 해석모델의 민감도 특성 해석)

  • Jo, Insu;Kwon, Jiwon;Lee, Jinwook
    • Transactions of the Korean Society of Automotive Engineers
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    • v.21 no.2
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    • pp.17-25
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    • 2013
  • Performance of DI diesel engine with high fuel injection method is directly related to the emission characteristics and fuel consumption. At present, diesel injection system with piezo element is replacing conventional solenoid type due to their faster electro-mechanical properties. In this study, it was investigated the sensitivity characteristics regarding internal hydraulic modeling based on the AMESim environment of piezo-driven injector The analytic parameter for this study defined such as In/Out orifice, injection hole's diameter and driven voltage on piezo stack. As the results, it was shown that these parameter influence on a fast response characteristics of piezo-driven injector. Also we found fuel pressure recovery time is faster about 0.1 ms due to larger IN orifice diameter. And larger OUT orifice diameter occurs maximum pressure drop with faster its timing of about 0.2 ms.

INVESTIGATION OF SHORT INJECTIONS USING STANDARD AND MODIFIED COMMON RAIL INJECTORS

  • Ficarella, A.;Giuffrida, A.;Lanzafame, R.
    • International Journal of Automotive Technology
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    • v.8 no.2
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    • pp.155-163
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    • 2007
  • The control of the fuel to be introduced into the combustion chamber under idling and low-load conditions is known to be a problem in Diesel engines, owing to the relatively small fraction of the full-load fuel needed under light loads. Thus, particular attention should be paid to the behavior of the injector with reference to short injection events. This work presents the results of an experimental campaign carried out with two different types of common rail injectors, a standard injector and a modified one. The latter, coming from a simple modification realized in a standard injector, exhibits linear behavior between injected fuel and solenoid energizing time in the field of short injections. A direct comparison of the two injection behaviors suggests a possible way to better control short or pilot injections.

Solenoid Valve DCC-PWM Control for Diesel Engines Fuel Pump (디젤엔진 연료펌프의 솔레노이드 밸브 DCC-PWM 제어)

  • 신우석;최규하
    • The Transactions of the Korean Institute of Power Electronics
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    • v.3 no.2
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    • pp.85-91
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    • 1998
  • This paper describes an study electric injection system for diesel engines. It is needed effective fuel injection which controls the solenoid valve of fuel pump. To solve this, this paper proposes DCC-PWM method which can realize fast reply and low holding current for solenoid valve on/off. For the proposed design method, simulation tools of ACSL are used to analyze the system. And the single-chip microcomputer is used to reduce the size of controller and to improve flexibility. And the systems validity can be verified through the experimental results.

A Study on Injector Durability Test with Diesel and BD20 Using Common Rail (커먼레일을 이용한 디젤과 BD20 연료가 인젝터에 미치는 영향에 관한 연구)

  • JEONG, YUNHO;LIM, OCKTAECK
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.5
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    • pp.393-401
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    • 2015
  • The characteristics of diesel and biodiesel are similar like as cetane number and auto-ignition temperature. High cetane number of diesel and BD could make possible to compression ignition. but BD showed different atomization from diesel due to component like density, viscosity and iodine value etc. Because of this, the biodiesel requires validation. This study using diesel and BD20 investigated effect to durability injector. Durability test were used common rail and bosch solenoid type 5-hole injector. Total test was 672hr but actual running time was 200hr. Spray experiments for spray characteristics were carried out using constant volume combustion chamber. Spray characteristics of diesel and BD showed different result up to durability test time. After 100hr, diesel showed spray shapes were stable but BD was not. After 200hr, difference of diesel and BD spray shapes were grow serious.

Sensitivity Analysis on Design Parameters of the Fuel Injector for CRDI Engines (커먼레일용 연료분사 인젝터의 설계변수에 대한 민감도 분석)

  • Jang, Joo-Sup;Yoon, Young-Hwan
    • Transactions of the Korean Society of Automotive Engineers
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    • v.17 no.5
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    • pp.107-114
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    • 2009
  • A Common-Rail Direct Injection (CRDI) system for high speed diesel engines was developed to meet reductions of noise and vibration, emission regulations. High pressure in the common rail with electric control allows the fuel quantity and injection timing to be optimized and controlled throughout a wide range of engine velocity and load conditions. In this study, CRDI system analysis model which includes fuel and mechanical systems was developed using commercial software, AMESim in order to predict characteristics for various fuel injection components. The parameter sensitivity analysis such as throttle size, injection rate, plunger displacement, supply pressure of fuel injection for system design are carried out.

Simulation of Fuel Injection System and Model of Spray Behavior in Liquefied Butane (액상부탄 분사시스템의 수치시뮬레이션 및 분무특성 예측)

  • Kim, J.H.;Koo, J.Y.
    • Journal of ILASS-Korea
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    • v.3 no.2
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    • pp.24-33
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    • 1998
  • The characteristics of liquefied butane spray are expected to be different from conventional diesel fuel spray, because a kind of flash boiling spray is expected when the back pressure is below the saturation vapor pressure of the butane(0.23MPa at $25^{\circ}C$). An accumulator type pintle injector and its fuel delivery system has been simulated in ruder to give injection pressure, needle lift and rate of fuel injected. The governing equation were solved by finite difference metho. The injection duration was controlled by solenoid valve. Spray behaviors such as a transient spray tip penetration, spray angle and SMD were calculated based on the empirical correlations in case that the back pressure is both above the vapor pressure of the butane and below that of butane. When the back preassure is below the vapor pressure of the fuel, conventional correlation is modified to represent the effect of flash boiling.

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Effect of nozzle geometry on the injection characteristics and spray behavior (고압 분사 디잴 인잭터의 노즐 형상이 분사 특성 및 분무 거동에 미치는 영향)

  • Lee, C.S.;Park, S.W.;Chon, M.S.
    • Journal of ILASS-Korea
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    • v.9 no.1
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    • pp.1-7
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    • 2004
  • This paper describes the characteristics of injection rate and macroscopic behavior of fuel spray injected from common-rail type diesel injectors with different nozzle geometries. The injection rates according to the nozzle geometries were measured at different energizing duration of the injector solenoid and injection pressure by using the Bosch's injection rate meter based on the pressure variation in the tube. The spray behaviors injected from the different nozzles were visualized using the spray visualization system composed of an Ar-ion laser, an ICCD camera, and a synchronization system at various injection and ambient pressures. It is revealed that VCO nozzle has higher spray tip velocity at the early stage of injection duration and wider spray cone angle than the mini-sac nozzles. Also the spray cone angle is increased with the increase of nozzle diameter.

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Evaluation of the Forging Process by the Application of Optimization Technology (최적화기법의 적용을 통한 냉간단조품의 성형공정 평가)

  • Yeo H.T.;Park K.H.;Hur K.D.
    • Transactions of Materials Processing
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    • v.15 no.3 s.84
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    • pp.226-231
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    • 2006
  • The fuel injector is a pa.1 that controls the fuel supply of automotive engine. The housing of the fuel injector supports the rod, the needle valve and the solenoid. In this study, the rigid-plastic FE-analysis by using the design of experiments (DOE) and the response surface methodology (RSM) has been performed to produce the product reducing the under-fill and the maximum effective strain. From the results of DOE, the stem of counter punch and the face angle of punch at the $1^{st}$ process, and the stem of punch at the $2^{nd}$ process were determined as the significant design variables far each response such as the upper under-fill, lower under-fill and the maximum effective strain. From the results of RSM, the optimal values of the design variables have been also determined by simultaneously considering the responses.