• Title/Summary/Keyword: 솔레노이드 인젝터

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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.

A Study on Design and Application of High Response Solenoid for Unit Injector (유닛인젝터용 고속응답 솔레노이드 설계 및 응용에 관한 연구)

  • 황재원;양이진;정영식;이상만;채재우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.1
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    • pp.43-51
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    • 1998
  • Most of fuel-injection system operated with mechanical methods are difficult to control the injection quantity and injection timing as well as injection rate exactly. Moreover high pressure injection scheme is never be realized with conventional one. On the other hand, serious air pollution can be lessened with injection system equipped with those functions. Therefore, electronically controlled Unit Injuctor(UI) appeared to satify above mentioned desires. However, it is still difficult that the most important part, especially solenoid valve, is analyzed precisely, because of the existence of complex combination of electromagnetics, electrics and dynamic problems. In this study, experimental and theoretical analysis are accomplished for understanding of solenoid valve characteristics and further its design. As the result, the follows are obtained 1) As the increase of wire diameter, the response time became shorter and optimal inductance existed in relative with the response time and wire diameter. 2) According to increasing input voltage, the traction force increased, otherwise the response time was shortened. 3) As the increase of armature stroke, the traction force decreased and the response time became longer.

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Injection Flow Rate Improvement of Injectors for DME Common-rail Systems (DME 커먼레일 시스템을 위한 인젝터 분사 유량 개선)

  • Lee, G.S.;Shin, S.S.;Park, J.H.
    • Journal of ILASS-Korea
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    • v.18 no.1
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    • pp.55-60
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    • 2013
  • In this study, injection flow rates and material of the solenoid sealing of the injectors were improved for the development of a di-methyl Ether(DME) common-rail system. To deliver the same amount of energy provided by injection pressure of diesel $P_{inj}$ = 160 MPa, the DME injectors need to have larger diameter of nozzle hole and more No. of hole at low injection pressure of $P_{inj}$ = 40~50 MPa. The simplified nozzle flow model, which takes account of nozzle geometry and injection condition, was employed in order to design the concept of a injector nozzle such as No. of hole, diameter of hole and diameter of needle seat, etc. Injection amount and rate were tested by diesel and DME test stand. As a result, the diameter of nozzle hole were enlarged by 0.25 mm. The diameter of the orifice in the high pressure line was increased by 1.0 mm to maintain hydraulic force in the nozzle. The material of the solenoid sealing was changed to HNBR, which was strong against the corrosive. Experimental results showed that the injection amount of the DME injector drastically increased by 191.9% comparison to that of diesel at $P_{inj}$ = 40 MPa.

Cycle Simulation for the Performance Prediction of a High Pressure Unit Injection System of a Diesel Engine (디젤엔진용 고압분사 유닛인젝터의 성능예측을 위한 사이클 시뮬레이션)

  • 김철호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.63-74
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    • 2001
  • In this study, a cycle simulation program of a Unit-Injection(UI) system was developed to estimate the injection performance of newly designed injection system. A fundamental theory of the simulation program is based on the conservation law of mass. Loss of fuel mass in the system due to leakage, compressibility effect of the liquid fuel and friction loss in the control volume was considered in the algorithm f the program. For the evaluation of the simulation program developed, the experimental result which was offered by the Technical Research Center of Doowon Precision Industry Co. was incorporated. Two main parameters; the maximum pressure in the plunger chamber and total fuel mass(kg) injected into the engine cylinder per cycle, were measured and compared with the simulation results. It was found that the maximum error rate of the simulation result to the experimental output was less than 3% in the rated rotational speed (rpm) range of the plunger cam.

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Flow Control of a Solenoid Gas Injector and Its Application on a Natural Gas Engine (솔레노이드 가스 인젝터의 유량제어와 천연가스엔진에서의 응용)

  • Sim, Han-Sub
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.8 no.2
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    • pp.83-89
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    • 2009
  • An air-fuel ratio control is essential in reducing hazardous exhaust emissions from a compressed natural gas(CNG) engine, and can be accomplished by accurate control of gas injection flow. In this study, theoretical research was conducted on injection characteristics of a solenoid gas injector, and injection experiments for calibration and analysis were performed. Various factors for gas injection flow such as injection pressure, gas temperature, and supply voltage are studied. A dynamic flow equation of the natural gas was proposed on the basis of flow dynamics theories and results of the injection experiment. The verification of the dynamic flow equation of the solenoid injector was carried out with a large CNG-engine applied to an urban bus. Air-fuel ratio control experiments were conducted in both steady and transient state. Results of injection experiments for the solenoid injector and the CNG-engine was proved the control method proposed herein to be effective.

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A High Pressure Fuel Control and its Injection Characteristics (고압 연료 제어와 분사 특성)

  • Kim, S.H.;Lee, Y.G.;Kim, J.U.;Kim, E.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.3 no.6
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    • pp.123-133
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    • 1995
  • An injection control valve(ICV) was designed to control the fuel flow between a common rail and an injector with two commercial solenoids. To improve the performance of ICV, the characteristic method was applied. With this method, the flow characteristics in the ICV and the injector were studied and the parameters which affect the injection characteristics were also studied. From this study, following results were obtained. The injection duration can be controlled and with modifications of the effective valve stroke of ICV, the injection quantity and duration can be reduced to desired amount. Also the injection quantity and pressure can be controlled by reducing the hole size of the injector without the variation of the injection duration. For some conditions, the desired injection characteristics can be obtained by the changes of the valve timing, the effective valve stroke, the open pressure of the injector and the hole size of the injector.

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1-D Model to Estimate Injection Rate for Diesel Injector using AMESim (디젤 인젝터 분사율 예측을 위한 AMESim 기반 1-D 모델 구축)

  • Lee, Jinwoo;Kim, Jaeheun;Kim, Kihyun;Moon, Seoksu;Kang, Jinsuk;Han, Sangwook
    • Journal of ILASS-Korea
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    • v.25 no.1
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    • pp.8-14
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    • 2020
  • Recently, 1-D model-based engine development using virtual engine system is getting more attention than experimental-based engine development due to the advantages in time and cost. Injection rate profile is the one of the main parameters that determine the start and end of combustion. Therefore, it is essential to set up a sophisticated model to accurately predict the injection rate as starting point of virtual engine system. In this research, procedure of 1-D model setup based on AMESim is introduced to predict the dynamic behavior and injection rate of diesel injector. As a first step, detailed 3D cross-sectional drawing of the injector was achieved, which can be done with help of precision measurement system. Then an approximate AMESim model was provided based on the 3D drawing, which is composed of three part such as solenoid part, control chamber part and needle and nozzle orifice part. However, validation results in terms of total injection quantity showed some errors over the acceptable level. Therefore, experimental work including needle movement visualization, solenoid part analysis and flow characteristics of injector part was performed together to provide more accuracy of 1-D model. Finally, 1-D model with the accuracy of less than 10% of error compared with experimental result in terms of injection quantity and injection rate shape under normal temperature and single injection condition was established. Further work considering fuel temperature and multiple injection will be performed.

Study for Fire Examples of LPG Leakage Including Fuel hose, Injector and Pressure Regulator Connector in Vehicle (자동차 연료호스, 인젝터 및 압력조절기 연결부에서 LP 가스 누출에 의한 화재사례 고찰)

  • Lee, Il Kwon;Kook, Chang Hoo;Suh, Moon Won;Jung, Dong Hwa
    • Journal of the Korean Institute of Gas
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    • v.17 no.3
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    • pp.8-13
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    • 2013
  • The purpose of this paper is to study for fire example by fuel leakage in LPG Vehicle. At first example, the car was repaired the fuel line that was connected with pressure hose between fuel regulator and injector in engine. But the service man was not very tighten with regular torque. At a result, the gas leaked on hot parts of engine. It verified the production of fire by engine heat. At second example, when the repair man, after replacement the injector, inserted the injector in a assembling part of it, he didn't the transform condition of fixing part. Therefore, the tearing phenomenon of O ring producted the controlled leakage of fuel by the injector deflection. It found the fact that the fuel leaked with gap of O ring. At third example. the fuel-cut solenoid valve was lined with pressure regulator unit. But the service man didn't throughly certify the leaked work of connected parts after repaired it. As a result, it certified the fire by engine heating leaked liquefied petroleum gas. Therefore it have to minimize the fire production that the driver should do no problem to throughly manage the fuel system.

Development of a Non-contact Type Magnetic Signal Monitoring Equipment for Automotive Electric Devices (비접촉식 자동차 전장용 자기신호 측정 장치)

  • Yang, Hyong-Yeol;Yang, Seung-Hak
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.5
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    • pp.381-386
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    • 2010
  • A non-contact type magnetic signal monitoring equipment for automotive electric devices is proposed in this paper. There are many kinds of actuators in the car like solenoid, relay, motor, injector, etc which are operated by magnetic energy. It is difficult to find out whether the actuators operate well or not because the terminals of the actuators are combined to the connectors. In this paper a non-contact type magnetic signal monitoring equipment using Hall effect sensor is proposed to measure the magnetic signal of the actuators very easily to find out the actuators' operating status. The simulation and experimental results show that the developed equipment is very useful and has good performance.

A Study on Characteristics of Injected Fuel Pressure Waves of a Solenoid Type Diesel Common Rail Injector with Controlling Current Wave for Driving the Injector (솔레노이드 타입 디젤 커먼레일 인젝터 구동을 위한 전류 파형 변화에 따른 분사 연료 압력파 특성)

  • Kim, Kil Tae;Lee, Choong Hoon
    • Journal of ILASS-Korea
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    • v.21 no.3
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    • pp.155-161
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    • 2016
  • Injected fuel pressure waves of a common rail injector with various current profiles supplied to the injecor were measured using Bosch method. In order to drive the common rail injector, the current in the solenoid should be controlled using what is known as a peak and hold pattern, which consists of a high current level with a short time duration (peak) in the first step and a low current level with a long time duration (hold) in the subsequent step. The current profile can be shaped by swithcing an injector driving power source with the peak and hold waves. The capture, compare and PWM (CCP) pin in the microprocessor was used to generate the combined peak and hold waves. The PWM square wave generated from the CCP pin has a duty ratio of 100% for the peak current and 10% or 30% for the hold pattern. Five patterns of the current profile were generated by combining the peak and hold wave. The common rail pressure is controlled at 75, 100, and 130 MPa. As the fuel rail pressure increases, the variations of the measured fuel injection pressure wave according to the current profiles decrease.