• Title/Summary/Keyword: Spark Ignition Engine

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A Study on the Application of New developed Digital CDI for small 2-stroke Gasoline Engine (소형 2행정 가솔린엔진용 디지털 콘덴서 스파크 방식 적용에 관한 연구)

  • 황재원;박재근;갈한주;김만호;채재우
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.9-15
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    • 1999
  • A digital CDI(Capacitive Discharge Ignition) system on small two stroke motorcycle engine was developed in this paper, This CDI system with microprocessor as its main part has more flexible spark timing than the conventional CDI system because of its programmable characteristics. The principle of this digital CDI system and the design methods of hardware and software were presented in this paper, Two stroke small engine was tested to investigate the performance of digital CDI system And also this system was investigated to optimize the engine performance. Also comparison between conventional CDI can provide better spark timing variation than the conventional system. The part and full load test results show that the engine power was increased about 10-20% and fuel consumption was decreased about 10-20% simultaneously. Furthermore, this digital CDI system has simple structure, low cost and very little modification are required. It is a promising technology to substitute for the widely used conventional CDI system.

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A Study About the Effect of Supercharging and Intake Charge on Engine Performance in Spark Ignition Gasoline Engine (SI 가솔린 엔진의 과급 및 흡기가 엔진 성능에 미치는 영향에 대한 연구)

  • Kim, Gi-Bok;Jin, Seok-Jun;Kim, Chi-Won;Yoon, Chang-Sik;Han, Sung-Hyun
    • Journal of the Korean Society of Industry Convergence
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    • v.18 no.2
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    • pp.110-118
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    • 2015
  • In this study, it is designed and used the test engine bed which is installed with turbocharger, and in addition to equipped using by oxygen adder. It has been controlled the oxygen volumetric fraction of intake air chrge, and supercharged flow rate into the cylinder of SI 4-stroke engine, and then, has been analyzed engine performance, combustion characteristics, and exhaust emission as analysis parameters. The tested parameters were the oxygen fraction and the variation of engine speed and air-fuel ratio.

Effect of Air-fuel Ratio on Combustion and Emission Characteristics in a Spark Ignition Engine Fueled with Bio-ethanol (공연비 변화가 바이오에탄올 연료 스파크 점화기관의 연소 및 배출물 특성에 미치는 영향)

  • Kim, Dae-Sung;Yoon, Seung-Hyun;Lee, Chang-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.18 no.1
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    • pp.37-43
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    • 2010
  • The purpose of this paper is to investigate the effect of air-fuel ratio on the combustion and emissions characteristics of spark ignition (SI) gasoline engine fueled with bio-ethanol. A 1.6L SI engine with 4 cylinders was tested on EC dynamometer. In addition, lambda sensor and lambda meter were connected with universal ECU to control the lambda value which is varied from 0.7 to 1.3. The engine performance and combustion characteristics of bio-ethanol fuel were compared to those obtained by pure gasoline. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), oxides of nitrogen ($NO_X$) and carbon dioxide ($CO_2$) were measured by emission analyzers. The results showed that the brake torque and cylinder pressure of bio-ethanol fuel were slightly higher than those of gasoline fuel. Brake specific fuel consumption (BSFC) of bio-ethanol was increased while brake specific energy consumption (BSEC) was decreased. The exhaust emissions of bio-ethanol fuel were lower than those of gasoline fuel under overall experimental conditions. However, the specific emission characteristics of the engine with bio-ethanol fuel were influenced by air-fuel ratio.

Study on the Simulation of the 4-Stroke Cycle Spark Ignition Engines (First Paper) (4 행정 사이클 스파크 점화기관의 시뮬레이션에 관한 연구 (제1보))

  • 윤건식;우석근;서문진;신승한
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.6
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    • pp.1260-1271
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    • 2001
  • The simulation program which predicts the gas behavior in a spark ignition engine has been developed and verified by the comparison with the experimental results foy the MPI engine, naturally aspirated and turbochared engines with a carburettor. First paper describes the calculations of the behavior of gas in the intake and exhaust system. The generalized method of characteristics including friction, heat transfer, area change and entropy gradients was used to analyse the pipe flow The constant-Pressure model was applied for the analysis of the flow through engine valved, and the constant-pressure perfect-mixing model was applied for the flow at manifold junction. The concept of the sudden area change was used for the muffler and catalytic convertor. Fer the plenum chamber in an MPI engine, constant-pressure model and constant-volume model were both examined. Through the comparison of predicted results with experiments, the simulation program was verified by showing good prediction of the behavior of IC engine qualitatively and quantitatively under wide range of operating conditions.

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The Effects of Intake Swirl Flow en Lean Combustion in an Sl Engine (흡입 스월유동이 Sl기관의 희박연소에 미치는 영향)

  • 정구섭;전충환;장영준
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.6
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    • pp.1298-1307
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    • 2001
  • Recently, the efforts to improve fuel economy and to reduce pollutant emission have become the main subject in the development of a gasoline engine. A lean combustion engine admitted as the best alternative is relatively lower fuel consumption rate and exhaust emissions. In this study, it is focused on intensifying intake flow field as one of methods to improve the performance of the lean combustion. First, three different types of suitable swirl control valve(SC7) with high swirl and tumble ratio are selected through steady flow experiment, being installed in a spark ignition engine. The relationship between lean misfire limit and torque was investigated with injection timing and spark ignition timing. Also, the effect of intensified swirl new on the combustion Stability and exhaust emissions was experimently examined by the measuring in-cylinder pressure and combustion variation. The results show that the engine with swirl control calve is superior to other conventional engine on the lean misfire limit, specific torque, combustion variation and emission, and the appropriate injection timing and spark ignition timing exist according to the type of swirl control valve.

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A Study on the Combustion Characteristics with Control Strategy and Injector Position Changes in a Lean-burn LPG Direct Injection Engine (연소제어 전략 및 분사기 위치 변경에 따른 직접분사식 초희박 LPG 엔진의 연소특성 연구)

  • Park, Cheolwoong;Park, Yunseo;Lee, Yonggyu;Oh, Seungmook;Kim, Taeyoung
    • Transactions of the Korean Society of Automotive Engineers
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    • v.22 no.4
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    • pp.98-104
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    • 2014
  • The technologies employing spray-guided type combustion system for ultra-lean combustion direct injection engine is focused as a promising technology for satisfying emission regulations and improving fuel economy. In the present study, control and design optimization of lean-burn LPG direct injection engine was carried out with control strategy and injection position changes. Inter-injection spark ignition strategy was applied and the effect of the strategy was assessed at relatively higher load operation condition than previous researches. In order to create richer mixture in the vicinity of spark plug electrode, relative distance between the dead-end of injector and the electrode of spark plug was changed.

Knock Control Using Cylinder Block Vibration Signals in a Spark-Ignition Engine (스파크 점화 기관의 실린더 블록 진동 신호를 이용한 노킹 제어)

  • 함윤영;전광민
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.1
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    • pp.186-194
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    • 1997
  • The objective of this study is to develope knock control algorithms which can increase engine power without causing frequent knock occurrence. A four cylinder spark-ignition engine is used for the experiments to develop knock control algorithms which use block vibration signals. Knock occurrence is detected accurately by using knock threshold values which consider the difference of transmission path of each cylinder. Spark timing is controlled both simultaneously and individually. With the simultaneous control, torque gain is achieved by retarding the spark timing on knock occurrence in propotion to the knock intensity. The individual knock control algorithm results in higher torque gain than the simultaneous knock control algorithm. The knock occurrence frequency of the individual knock control algorithm is about twice the value of the simultaneous knock control algorithm results. Both control algorithms give similar torque gain of about 3% when they are optimized.

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Design and Development of an Electronic Control Unit of the Automobile Engine for Optimal Fuel Injection and Spark Timing Control (최적의 연료분사와 점화시기 제어를 위한 자동차 엔진용 전자제어장치 설계 및 개발)

  • 김태훈
    • Journal of Advanced Marine Engineering and Technology
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    • v.25 no.3
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    • pp.644-654
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    • 2001
  • In this paper, an electronic control unit of the automobile engine for optimal fuel injection an spark timing control has been designed and developed. This system includes hardware and software for a precise control of fuel injection and ignition timing. Especially, the crank angle sensor provides two separate signals: One is the position signal (POS) which indicates 180 degree pulses per revolution, and the other is the reference signal (REF) that represents each cylinder individually. Consequently, the developed engine control system has been able to control fuel injection and ignition timing more quickly and accurately. Through the experiment, it has been found that the fuel injection duration and the position of MBT have been influenced by coolant temperature, air flow rate and engine speed.

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An Experimental Study on Engine Performance of LPG/Gasoline Bi-Fuel (LPG/가솔린 Bi-Fuel 엔진성능에 관한 실험적 고찰)

  • Jun, Bong-Jun;Park, Myung-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1433-1438
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    • 2009
  • The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. We propose the control system which can advance the ignition spark timing in LPG fuel mode more than used in gasoline fuel mode. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000) and the ignition timing advance($5^{\circ}$,$10^{\circ}$,$15^{\circ}$,$20^{\circ}$) As the result, between 1500rpm and 2000rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at $20^{\circ}$was smaller value. Also, the heat release rate at 1500rpm was increased but it was lower around $20^{\circ}$at 2000rpm.

Effect of inlet air humidity on the combustion process of the spark-ignition engine (흡입습도가 스파아크 점화기관의 연소과정에 미치는 영향)

  • 김문헌;이성열
    • Journal of the korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.41-47
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    • 1983
  • The analysis shows that the variation of maximum pressure of the cycle, rate of hear release, rate of mass burned, and combustion delay are influenced by the inlet air humidity in the spark-ignition engine. The quantitative combustion delay can be obtained from the rate of mass burned. Also, the variation of time loss and effective compression ratio with the change of inlet air humidity are dominated by the development of rate of heat release.

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