• Title/Summary/Keyword: 점화시기

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Development of Electronic Control Fuel Injection and Spark Timing Controller for Automobile Engine (자동차 기관용 전자제어 연료분사 및 점화시기 제어기 개발)

  • Kim, T.H.;Min, G.S.;Yang, S.H.;Jang, H.S.
    • Journal of the Korean Society of Safety
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    • v.10 no.4
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    • pp.22-35
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    • 1995
  • In this paper, an electronic control unit is developed using 16bit microcomputer for automobile engine. This system incorporate AFS(Air Flow Sensor) of Hot Wire type, DIS(Direct Ignition System), ISC(Idle Speed Control) system, CAS(Cranke Angle Sensor) and other peripheral device. This system includes hardware and software to facilitate precision control of both fuel injection and ignition timing. Especially, this controller consists of position signal(180 teeth) and 4 REF signals. Present system has maximum $720^{\circ}CA$ delay. But this system has maximum $180^{\circ}CA$. Thus, this system is able to precision control both fuel injection and ignition timing.

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Generating efficiency and NOx emissions of a gas engine generator fuelled with biogas (바이오가스를 이용한 가스엔진 발전기의 발전효율 및 질소산화물 배출 특성)

  • Lee, Kyung-Taek;Cha, Hyo-Seok;Chun, Kwang-Min;Song, Soon-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.306-309
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    • 2009
  • Concern for new and renewable energy is growing globally. Biogas is one of the alternative fuels and consists of methane and carbon dioxide. It is difficult to achieve efficient engine operation due to a lower heating value of biogas compared to that of natural gas. In order to improve generating efficiency, finding an optimum point of ignition timing and excess air ratio is important. From this fact, generating efficiency and pollutant emissions of 2300cc gas engine generator operated by biogas as functions of ignition timings and excess air ratios were investigated in this study. As a test result, the generating efficiency of the gas engine generator using biogas was 27.34 % in the condition of the BTDC of $16^{\circ}$ and the excess air ratio of 1.4.

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An Experimental Study of the Improvement of Driveability in Vehicle Acceleration Mode (차량 급가속시 운전성 개선을 위한 실험적 연구)

  • 송해박;최윤준;이종화;조한승;조남효
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.6
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    • pp.65-75
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    • 2001
  • Modern vehicles require a high degree of refinement including good driveability. Vehicle driveability, which becomes a key decisive factor f3r marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. Therefore engine and drive train characteristics should be considered to achieve a well balanced vehicle response simultaneously. This paper describes experimental procedures which have been developed to measure engine torque and investigate shuffle characteristics. To analyze the vehicle dynamic behavior, fractional torques and inertia mass moment of engine, and drive train were measured. Shuffle characteristics during tip-in condition were investigated in an experimental vehicle at 2nd and 3rd gear stages. It was found that the shuffle characteristics were caused by sudden changes of engine torque and have a different vibration frequency with gear stage variation. Inertia mass moment of engine including flywheel rotation showed a key factor for the shuffle characteristics.

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Effects on Combustion Characteristics Induced by Ignition Timing and Shape of Passagehole in a IDI Type Constant Volume Combustion Chamber (IDI형 정적 연소기에서 점화시기 및 연락공의 형상이 연소특성에 미치는 영향)

  • 윤수한;이중순;김현지;박춘근;하종률
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.3
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    • pp.220-231
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    • 1996
  • In this research, we use IDI type constant volume combustion chamber which may make up stratified combustion to construct the design back data of lean-burn engine. Some experiments are conducted by the passagehole angle in the adapter of main chamber and sub-chamber. The effects on the combustion characteristics according to the ignition timing are investigated. The used fuel is methanol prospective for alternative fuel. Fuel is injected under 10.78MPa using solenoid and accumulator. As the results of the experiment, combustion characteristics reveals that ignition timing, passagehole angle and shape greatly effects on. Lean inflammability limit is extended to 0.45 in equivalence ratio.

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Evaluation of Combustion Stability of Idling Speed State (LBT연소를 통한 Idling 운전시의 연소안정성 평가)

  • 이중순;이종승;김진영;정성식;하종률
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.66-72
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    • 1999
  • It is necessary to discuss lightening engine parts and reducing the friction of sliding parts to improve fuel consumption and combustion stability at idling condition. Lean best torque combustion which produce maximum power at a lean air-fuel ratio is effective for the reduction of exhaust gas emission and the improvement of fuel consumption. Accordingly, this study deals with the expansion of lean combustible limitation, the combustion stability and the reduction of idle speed through the analysis of combustion characteristics on the base of the control technique of precise air-fuel ratio because it does not need to maximum power at idling condition. The idle speed is increased proportional to ISC(Idle Speed Control) duty ratio. On the other hand the idle speed decreased by lean air-fuel ratio. The COV in engine speed is stable within maximum two percent up to 17.6 mixture ratio by the control of ISC duty ratio.

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A Study of the Control Logic Development of Driveability Improvement in Vehicle Acceleration Mode (차량 급가속시 운전성 향상을 위한 제어로직 개선에 관한 연구)

  • 최윤준;송해박;이종화;조한승;조남효
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.2
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    • pp.101-116
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    • 2002
  • Modern vehicles require a high degree of refinement, including good driveability to meet customer demands. Vehicle driveability, which becomes a key decisive factor for marketability, is affected by many parameters such as engine control and the dynamic characteristics in drive lines. Therefore, Engine and drive train characteristics should be considered to achieve a well balanced vehicle response simultaneously. This paper describes analysis procedures using a mathematical model which has been developed to simulate spark timing control logic. Inertia mass moment, stiffness and damping coefficient of engine and drive train were simulated to analyze the effect of parameters which were related vehicle dynamic behavior. Inertia mass moment of engine and stiffness of drive line were shown key factors for the shuffle characteristics. It was found that torque increase rate, torque reduction rate and torque recovery timing and rate influenced the shuffle characteristics at the tip-in condition for the given system in this study.

A Nonlinear Dynamic Engine Modeling for Controller Design (제어기 설계를 위한 비선형 동적 엔진 모델링)

  • 윤팔주;선우명호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.7
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    • pp.167-180
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    • 1999
  • A control-oriented nonlinear dynamic engine model is developed to represent a spark ignited engine over a wide range of operating conditions. The model includes intake manifold dynamics,. fuel film dynamics, and engine rotational dynamics with transport delays inherent in the four stroke engine cycles. The model is mathematically compact enough to run in real time, and can be used as an embedded model within a control algorithm or an observer. The model is validated with engine-dynamometer experimental data, and can be used in design and development of a powertrain controller.

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트라이볼로지 관점에서 본 피스톤-실린더계의 연구개발

  • 김청균
    • Journal of the KSME
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    • v.32 no.11
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    • pp.910-916
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    • 1992
  • 신엔진 개발에서 동력을 증대시키려는 연구와 얻어진 에너지가 엔진을 구동시키기 위한 내부에 너지로 소비되지 않고 가능한 제동마력으로 보내려는 에너지 절약의 측면에서 접근하려는 연구가 있다. 전자의 연구개발은 연료와 공기의 열유동 해석, 혼합비 조절, 점화시기 및 방법, 연료의 선정, 터보차저의 설치, 즉 엔진에 공급되는 고열원부의 열량 $Q_H$ 를 증가 시키든지 또는 대기중으로 방출하는 저열원부의 열량$Q_L$ 을 어떻게 감소시키느냐에 관심을 가지고 있는 연구이다. 그러나 후자의 경우는 이미 생산된 에너지를 가능한 한 소비시키지 않고 모두 제동 마력으로 보내도록 노력하는 연구, 즉 트라이몰로지에 기초를 둔 연구개발 분야이다. 엔진개발 에서 트라이볼로지의 역할은 대단히 중요하나 기술 자체가 대단히 미시적이기 때문에 신기술 개발이 대단히 어려우며, 이 분야의 필요성이 크게 대두된 것도 십수년 전에 불과하므로 기술 축적이 많이 안된 분야 중의 하나이다. 트라이볼로지 기술의 필요성이 현저하게 부각되기는 하 였지만 해결하기가 대단히 어려운 분야이다. 그러나 일단 섬세하고도 미시적인 트라이볼로지 기술의 벽을 극복하면 큰 효과를 발휘하게 된다. 고도의 첨단기술을 개발하고 적용해야 하는 선진기술국에서는 에너지 절약의 측면보다는 새로운 기술개발의 측면에서 트라이볼로지 기술을 적극적으로 지원하고 있다.

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The Fundamental Study on Generation of High Turbulence at Vicinity of Ignition Timing (점화시기 근방의 고난류 생성을 위한 기초연구)

  • Hong, Jae-Ung;Song, Yeong-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.20 no.1
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    • pp.275-283
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    • 1996
  • The turbulence in the engine cylinder is generated by intake pressure and inertia effects during intake stroke, and is generated and decreased by piston compression effect during the compression stroke. The classified needed to generate high turbulence flow at vicinity of ignition timing. Therefore, A single-shot Rapid Intake Compression Expansion Machine (RICEM), which is able to realize the intake, compression, expansion or intake-compression stroke under high piston speed respectively, was manufactured and evaluated in order to find methods to generate high turbulence at around spark timing. It was found that the characteristics of RICEM such as reapperance, leakage, piston displacement with crank angle was corresponding to those of real engine and RICEM simulates not only high temperature and high pressure field but also flow patterns of the actual engine by increasing of pressure in intake line.

Effect of Multiple Injection on the Performance and Emission Characteristics of Lean Burn Gasoline Direct Injection Engines (다단분사가 초희박 GDI 엔진의 성능 및 배기에 미치는 영향)

  • Oh, Jin-Woo;Park, Cheol-Woong;Kim, Hong-Suk;Cho, Gyu-Baek
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.36 no.2
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    • pp.137-143
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    • 2012
  • Currently, in order to meet the reinforced emissions regulations for harmful exhaust gas including carbon dioxide ($CO_2$) as a greenhouse gas, technologies for reducing $CO_2$ emission and fuel consumption are being developed. Gasoline direct injection (GDI) systems have the advantage of improved fuel economy and higher power output than port fuel injection gasoline engine systems. The aim of this study is to examine the performance and emission characteristics of a lean burn GDI engine equipped with spray-guided-type combustion system. Stable lean combustion was achieved with a late fuel injection strategy under a constant operating condition. Further improvement in specific fuel consumption is possible with the introduction of multiple fuel injection strategies, which also increases hydrocarbon (HC) and nitrogen oxide ($NO_x$) emissions and decreases carbon monoxide (CO) emission.