• 제목/요약/키워드: Spark-ignition

검색결과 452건 처리시간 0.023초

퍼지제어방식을 이용한 SI엔진 속도제어 (Spark Ignition Engine Speed Control Using fuzzy Control Strategy)

  • 신동목;김응석;김문철;민종진
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1997년도 하계학술대회 논문집 B
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    • pp.672-674
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    • 1997
  • In this paper, we study the idle speed control of the spark ignition engine. Engine idle speed control is a difficult problem because of troublesome characteristics such as severe process nonlinearities, variable time delays, time-varying dynamics and unobservable internal system states and disturbances. We investigate the intelligent control algorithms such as neural network controller and fuzzy controller for 4-cylinder 4-stroke engine.

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CARS를 이용한 DOHC 스파크 점화 기관의 말단 가스 온도 측정 (End-Gas Temperature Measurments in a DOHC Spark-Ignition Engine Using CARS)

  • 최인용;전광민;박철웅;한재원
    • 한국자동차공학회논문집
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    • 제7권7호
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    • pp.122-128
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    • 1999
  • CARS(Coherent anti-Stokes Raman Spectroscopy) temperature measurement under engine-like condition was validated by measuring unburned gas temperatures of premixed propane-air flame in a constant volume combustion chamber. The measured temperatures were compared with predictions of 2 zone flame propagation model. End-gas temperatures were measured were measured by CARS technique in a conventional 4 cylinder DOHC spark-ignition engine fueled with PRF 80. Cylinder pressure was measured simultaneously with CARS signal and used as a parameter on fitting CARS spectrum to library of theoretical spectra. There was a good agreement between the measured temperature and adiabatic core temperature calculated from measured cylinder pressure. Significant heating by pre-flame reaction in the gas was observed in the late part of compression stroke.

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A STUDY ON THE PERFORMANCE AND EMISSIONS CHARACTERISTICS OF SPARK IGNITION ENGINE FUELLED WITH ETHANOL GASOLINE BLENDED FUEL

  • Han, Sung Bin
    • 에너지공학
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    • 제23권2호
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    • pp.170-174
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    • 2014
  • This paper presents the influences of ethanol addition to gasoline on bench test a spark ignition engine performances and emissions characteristics. The use of ethanol gasoline blended fuels decrease the brake power and brake torque, and increases the brake specific fuel consumption (BSFC). Ethanol gasoline blended fuels show lower brake torque and brake power and higher BSFC than gasoline. When ethanol containing oxygen is blended with gasoline, the combustion of the engine becomes better and therefore CO emission is reduced. HC emissions decrease to some extent as ethanol added to gasoline increase, as the percentage of ethanol in the blends increased, NOx emission was decreased under various engine speeds.

스파아크 점화기관의 흡기습도에 대한 화염속도 및 연소의 변화 (Change in flame velocity and combustion with inlet air humidity on the spark ignition engine)

  • 김문헌;이성열
    • 오토저널
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    • 제5권4호
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    • pp.41-46
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    • 1983
  • The influence of inlet air humidity on the flame velocity and combustion of the spark ignition engine were described experimentally by means of the flame velocity measuring apparatus using ion-current. The flame velocity are greatly influenced air fuel ratio and engine speed, and linealy decrease according to the increasing of inlet air humidity. The flame travell curve is very similar to the rate of mass burned and combustion progressive is estimated mostly by only the rate of mass burned curve. The decreasing of the mean flame velocity is about 0.4m/s for increasing of 0.001 specific humidity and we think the reason is mainly decreasing of thermal conductivity.

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에폭시 성형 점화코일의 인가전압에 따른 부분 방전 온도 의존성 (Temperature Dependence on the Partial Discharge of Epoxy Molding Ignition Coil According to Applied Voltage)

  • 신종열;홍진웅
    • 한국전기전자재료학회논문지
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    • 제28권2호
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    • pp.85-91
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    • 2015
  • A gasoline engine automobile uses high voltage generation of the ignition coil, igniting and burning mixed fuel in the combustion chamber, which drives the engine. When the electronic control unit intermits a current supplied to the power transistor, counter electromotive force with a low voltage is generated by self induction action in the ignition primary coil and a high voltage is induced by mutual induction action with the primary ignition coil in the second ignition coil. The high voltage is supplied to the ignition plug in the combustion chamber, causing a spark, igniting the compressed mixed fuel. If a very small defect occurs inside the insulating material when a voltage is applied in said ignition coil, the performance of the insulation material will get worse and breakdown by a partial discharge of corona discharge. Thus, in this experiment, we are to contribute to improve the performance and ensure the reliability of the ignition coil by investigating partial discharge characteristics according to the change of voltage and temperature when a voltage is applied to the specimen of the epoxy molding ignition coil.

스파크 점화 엔진에서 희박연소의 전자제어 히스테리시스 현상에 관한 실험적 연구 (A Experimental Study on the Electronic Control Hysteresis Phenomenon of Lean Burn in Spark Ignition Engine)

  • 김응채;김판호;서병준;김치원;이치우
    • Journal of Advanced Marine Engineering and Technology
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    • 제28권3호
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    • pp.475-481
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    • 2004
  • Recently it is strongly required on lower fuel consumption. lower exhaust emission, higher engine performance. and social demands in a spark ignition gasoline engine. In this study. the experimental engine used at test. it has been modified the lean burn gasoline engine. and used the programmable engine management system, and connected the controller circuit which is designed for the engine control. At the parametric study of the engine experiment, it has been controlled with fuel injection, ignition timing. swirl mode, equivalence ratio engine dynamometer load and speed as the important factors governing the engine performance adaptively. It has been found the combustion characteristics to overcome the hysteresis phenomena between normal and lean air-fuel mixing ranges. by mean of the look-up table set up the mapping values. at the optimum conditions during the engine operation. As the result, it is found that the strength of the swirl flow with the variation of engine speed and load is effective on combustion characteristics to reduce the bandwidth of the hysteresis regions. The results show that mass fraction burned and heat release rate pattern with crank angle are reduced much rather, and brake specific fuel consumption is also reduced simultaneously.

플라즈마 제트 플러그의 형상이 정적연소기내 연소특성에 미치는 영향 (Effect of the Configuration of Plasma Jet Plug on Combustion Characteristics in a Constant Volume Vessel)

  • 김문헌;유호선;오병진;박정서
    • 대한기계학회논문집B
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    • 제23권5호
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    • pp.593-602
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    • 1999
  • This paper presents combustion characteristics of LPG-air mixture ignited by the plasma jet in a cylindrical vessel with constant volume, in which our focus is placed on the multi-hole plug configuration. Four types of the plug configuration depending on the number of orifice and the arranged angle are considered, along with two cases of conventional spark ignition for comparison. Not only the flame propagation is photographed at intervals, but the pressure in the combustion chamber is also recorded through the entire combustion process. The results show that the plasma jet ignition enhances the overall combustion rate remarkably in comparison to the spark ignition by generating irregular flame front and penetrating through the unburned mixture. The combustion enhancement rate agrees favorably with the available data, which supports the validity of our experiment. Synthetically estimating, the two-hole sixty-degree plug appears to be the most desirable, in that the maximum pressure as well as the combustion duration is less affected by the sub-energy level than the others. It is also deduced that there may exist an optimal plug configuration capable of rapid combustion for a specific combustion chamber.

가솔린엔진의 냉시동 천이구간에서 배출가스 온도 및 유해배출물 특성에 관한 연구 (Characteristics of Exhaust Gas Temperature and Harmful Emission During Cold Start Transient Operation in an SI Engine)

  • 조용석;정대철;박영준;김득상
    • 대한기계학회논문집B
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    • 제30권12호
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    • pp.1181-1187
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    • 2006
  • Stringent regulations of exhaust emission from vehicles become a major issue in automotive industries. In SI engines, it is one of the crucial factor to reduce exhaust emissions during cold start in order to meet stringent regulations such as SULEV or EURO-4, because SI engines emit a large portion of total harmful exhaust compounds when they are cold. At early stages of cold start in gasoline engines, exhaust gas temperature plays a key role to improve three way catalyst by virtue of fast warmup. Therefore, this study focused on the increase of exhaust gas temperature under controls of engine operating parameters such as spark ignition timing, valve overlap by virtue of intake VVT and catalyst heating function. Furthermore, effects on harmful emission due to these parameters are also investigated. Experiments showed that retarded spark ignition timings and increased valve overlap may be helpful to increase exhaust gas temperature. It was also found that $NO_x$ was decreased with increased valve overlap. This study also showed that sudden changes in ISA and amount of fuel due to the deactivation of catalyst heating function cause temporal increase of harmful emissions.

균질혼합압축점화기관의 배출가스특성에 관한 연구 (A Study on the Emissions of Homogeneous Charge Compression Ignition Engine)

  • 한성빈;최경호
    • 대한기계학회논문집B
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    • 제28권3호
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    • pp.324-329
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    • 2004
  • As a new concept in engines and a power source for future automotive applications, the HCCI(Homogeneous Charge Compression Ignition) engine has been introduced. Essentially a combination of spark ignition and compression ignition engines, the HCCI engine exhibits low NO$_x$ and PM emissions as well as high efficiency under part load. In this research, a 4 cylinder diesel engine was converted into a HCCI engine, and propane was used as the fuel. The main parameters for this research are fuel flow rate and the temperature of the intake manifold, and the effects of such on a HCCI engine's performance and exhaust was investigated.

Breaker Point 型 점火裝置 性能 을 極大化하기 위한 Pre - Resistance 효果 에 對한 硏究 (A Study of the Pre-Resistance Effects on the Optimization For Performance of the Ignition System with the Breaker Point Type)

  • 손병진;신영철
    • 대한기계학회논문집
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    • 제6권2호
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    • pp.133-139
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    • 1982
  • One of factors that affect combustion in the cylinder of the engine is to keep a greater energy in the ignition system to minimize pollutant emissions and to increase its performance of the low temperature. This paper reviews theoretically the state and input variables of the ignition system from the state transition equation. Effects on characteristics of the system such as primary current, secondary available voltage and spark duration by reducing the pre-resistance from 3.5 to 0 ohm in 12V system is experimentally investigated when the ignition coil has a primary resistance of 1.5 ohms ad the dwell angle of the breaker point is 43.2 degrees (0.75 radian). Advantages and limitations for using the low resistance of the primary circuit are also presented to optimize the performance of the ignition system with the breaker point.