• Title/Summary/Keyword: Spark timing

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An Investigation on a Cause of Cycle Variation in Hydrogen Fueled Engine with Direct Injection (직접분사식 수소기관의 사이클변동 원인해석에 관한 연구)

  • Kim, Y.Y.;Lee, Jong T.
    • Transactions of the Korean hydrogen and new energy society
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    • v.13 no.3
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    • pp.233-241
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    • 2002
  • To achieve hydrogen power system with high performance and stable operation, the COVimep of hydrogen fueled engine with direct injection was evaluated with the change of engine speed, injection timing, air-fuel equivalence ratio and spark timing. And the cause of cycle variation was analyzed by using coefficient of variation in combustion period defined in this study. the results showed that the cycle variation of hydrogen fueled engine is mainly dependent on the early combustion period.

A Study on the Improvement of Combustion Stability for SI Engine at Idle Operation (SI 기관의 공회전시 연소 안정성 향상에 관한 연구)

  • Lee, J.S.
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.6
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    • pp.259-266
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    • 1998
  • In the SI engine, the improvement of combustion stability is important not only for the fuel consumption rate but also for the emission control at idling of engine. Thus the engine speed fluctuation at idle operation mainly comes from cyclic variation of combustion in the SI engine. In this syudy, the improvement of combustion stability for the SI engine at idle condition by the cooling water temperature, duty ratio of ISC, spark ignition timing as well as the reducement of the harmful exhaust gas emission was discussed.

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Electronic engine control by use of personal computer (퍼스날 컴퓨터를 이용한 전자엔진 제어)

  • 함영국;류태우;서병설;이양희;최준영
    • 제어로봇시스템학회:학술대회논문집
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    • 1992.10a
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    • pp.975-980
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    • 1992
  • The purpose of this paper is to perform the engine driving well with controling the IAC(Idle Air Control) valve which controls the demand-air when the abrput increasing or decrasing and the idling, the fuel by controlling the injector, and the spark timing. This plant is the complex system because this should be controlled each other and each one affects other. We have controlled this system effectively by using Personal Computer in order to reduce the exhaust gas and improve the engine performance.

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A study of electronic gasoline engine control technique (전자식 가솔린 엔진의 조절 방법에 관한 연구)

  • 성낙원
    • Journal of the korean Society of Automotive Engineers
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    • v.9 no.5
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    • pp.66-76
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    • 1987
  • The control technique for an electronic engine is studied. For this study an IBM-PC and a throttle body fuel injection system are selected. The computer controls fuel injection, spark timing, exhaust gas recirculation and idle speed. Fuel injection is adjusted either by a feed back signal of a zirconia $O_{2}$ sensor or programmed logic for starting, deceleration, warm ing up and idle modes. When a 3-way catalytic converter is used with the electronic engine control system, CO, THC, and NOx were reduced more than 90% simultaneously.

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An Experimental Study on Phenomenon of Backfire in H2 HCCI Engine (예혼합 압축착화 수소기관의 역화현상에 관한 실험적 연구)

  • Lee, Jongmin;Lee, Jonggoo;Lee, Kwangju;Lee, Jongtai
    • Transactions of the Korean hydrogen and new energy society
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    • v.26 no.1
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    • pp.28-34
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    • 2015
  • HCCI (Homogeneous Charged Compression Ignition) hydrogen engine has relatively narrower operation range caused by backfire occurrence due to the rapid pressure rising by using higher compression ratio and significant reaction velocity. In this study, to grasp of backfire process and characteristic in the HCCI research hydrogen engine, in-cylinder pressure, intake pressure and backfire limit range are analyzed with compression ratio and intake valve open timing, experimentally. As the result, it is observed that knock is occurred just before backfire occurrence in HCCI hydrogen engine but not spark igntion type, this phenomenon is always the same for the above variables. Also backfire limit range are expanded up to 50% for the more retarding intake valve open timing in this operating conditions.

Performance and Emission Characteristics of a Controlled Auto-Ignition Gasoline Engine according to Variation of the Injection Timing (분사시기의 변화에 따른 제어자발화 가솔린기관의 성능 및 배기특성)

  • Kim, H.S.
    • Journal of Power System Engineering
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    • v.9 no.1
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    • pp.14-22
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    • 2005
  • This work deals with a controlled auto-ignition (CAI) single cylinder gasoline engine, focusing on the extension of operating conditions. The fuel is injected indirectly into electrically heated inlet air flow. In order to keep a homogeneous air-fuel mixing, the fuel injector is water-cooled by a specially designed coolant passage. Investigated are the engine performance and emission characteristics under the wide range of operating conditions such as 40 in the air-fuel ratio, 1000 to 1800 rpm in the engine speed, $150\;to\;180^{\circ}C$ in the inlet-air temperature, and $80^{\circ}$ BTDC to $20^{\circ}$ ATDC in the injection timing. A controlled auto-ignition gasoline engine can be achieved that the ultra lean-burn with self-ignition of gasoline fuel by heating inlet air. It can be achieved that the emission concentrations of carbon monoxide, hydrocarbons and nitrogen oxide had been significantly reduced by CAI combustion compared with conventional spark ignition engine.

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An Experimental Study on the Flow Characteristics and the Stratification Effects in Visualization Engine Using the DPIV and the Entropy Analysis (DPIV와 엔트로피 해석방법을 이용한 가시화 엔진내의 유동 특성 및 성층효과에 관한 실험적 연구)

  • Lee Changhee;Lee Kihyung;Lee Changsik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.1
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    • pp.9-18
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    • 2005
  • The objective of this study is to analyse the spray characteristics according to the injection duration under the ambient pressure condition, and the injection timing in the visualization engine. In order to investigate the spray behavior, we obtained the spray velocity using the PIV method that has been an useful optical diagnostics technology, and calculated the vorticity from spray velocity component. These results elucidated the relationship between vorticity and entropy which play an important role in the diffusion process for the early injection case and the stratification process for the late injection case. In addition, we quantified the homogeneous diffusion rate of spray using the entropy analysis based on the Boltzmann's statistical thermodynamics. Using these method, it was found that the concentration of spray droplets caused by the increase of injection duration is more effective than the increase of momentum dissipation. We also found that the homogeneous diffusion rate increased as the injection timing moved to the early intake stroke process and BTDC $50^{\circ}$ was the most efficient injection timing for the stratified mixture formation during the compression stroke.

Particulate Emissions from a Direct Injection Spark-ignition Engine Fuelled with Gasoline and LPG (가솔린 및 LPG 연료를 사용하는 직접분사식 불꽃점화엔진에서 배출되는 극미세입자 배출 특성에 관한 연구)

  • Lee, Seok-Hwan;Oh, Seung-Mook;Kang, Kern-Yong;Cho, Jun-Ho;Cha, Kyoung-Ok
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.3
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    • pp.65-72
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    • 2011
  • In this study, the numbers, sizes of particles from a single cylinder direct injection spark-ignition (DISI) engine fuelled with gasoline and LPG are examined over a wide range of engine operating conditions. Tests are conducted with various engine loads (2~10bar of IMEP) and fuel injection pressures (60, 90, and 120 bar) at the engine speed of 1,500 rpm. Particles are sampled directly from the exhaust pipe using rotating disk thermodiluter. The size distributions are measured using a scanning mobility particle sizer (SMPS) and the particle number concentrations are measured using a condensation particle counter (CPC). The results show that maximum brake torque (MBT) timing for LPG fuel is less sensitive to engine load and its combustion stability is also better than that for gasoline fuel. The total particle number concentration for LPG was lower by a factor of 100 compared to the results of gasoline emission due to the good vaporization characteristic of LPG. Test result presents that LPG for direct injection spark ignition engine help the particle emission level to reduce.

Using IoT and Apache Spark Analysis Technique to Monitoring Architecture Model for Fruit Harvest Region (IoT 기반 Apache Spark 분석기법을 이용한 과수 수확 불량 영역 모니터링 아키텍처 모델)

  • Oh, Jung Won;Kim, Hangkon
    • Smart Media Journal
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    • v.6 no.4
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    • pp.58-64
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    • 2017
  • Modern society is characterized by rapid increase in world population, aging of the rural population, decrease of cultivation area due to industrialization. The food problem is becoming an important issue with the farmers and becomes rural. Recently, the researches about the field of the smart farm are actively carried out to increase the profit of the rural area. The existing smart farm researches mainly monitor the cultivation environment of the crops in the greenhouse, another way like in the case of poor quality t is being studied that the system to control cultivation environmental factors is automatically activated to keep the cultivation environment of crops in optimum conditions. The researches focus on the crops cultivated indoors, and there are not many studies applied to the cultivation environment of crops grown outside. In this paper, we propose a method to improve the harvestability of poor areas by monitoring the areas with bad harvests by using big data analysis, by precisely predicting the harvest timing of fruit trees growing in orchards. Factors besides for harvesting include fruit color information and fruit weight information We suggest that a harvest correlation factor data collected in real time. It is analyzed using the Apache Spark engine. The Apache Spark engine has excellent performance in real-time data analysis as well as high capacity batch data analysis. User device receiving service supports PC user and smartphone users. A sensing data receiving device purpose Arduino, because it requires only simple processing to receive a sensed data and transmit it to the server. It regulates a harvest time of fruit which produces a good quality fruit, it is needful to determine a poor harvest area or concentrate a bad area. In this paper, we also present an architectural model to determine the bad areas of fruit harvest using strong data analysis.

The Characteristics of Ozone Formation from a Gaseous Fueled SI Engine with Various Operating Parameters (여러 가지 운전조건에 따른 가스연료엔진 오존발생량 연구)

  • 김창업;강건용;배충식
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.6
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    • pp.86-92
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    • 2003
  • To analyze the characteristics of ozone formation, measurements of the concentrations of individual exhaust hydrocarbon species have been made under various engine operating parameters in a 2-liter 4-cylinder engine for natural gas and LPG. Tests were performed at constant engine speed, 1800 rpm for two compression ratios of 8.6 and 10.6, with various operating parameters, such as excess air ratio of 1.0~1.6, bmep of 250~800 na and spark timing of BTDC 10~$55^{\circ}$. It was found that the natural gas gave the less ozone formation than LPG in various operating conditions. This was accomplished by reducing the emissions of propylene($C_3H_6$), which has relatively high maximum incremental reactivity factor, and propane($C_3H_8$) that originally has large portion of LPG. In addition, the natural gas show lower values in the specific reactivity and brake specific reactivity. Higher compression ratio of the test engine showed higher non methane HC emissions. However, specific reactivity value decreased since fuel species of HC emissions increase. brake specific reactivity showed almost same values under high bmep, over 500kPa for both fuels. This means that the increase of non methane HC emissions and the decrease of specific reactivity with higher bmep affect each other simultaneously. With advanced spark timing, brake specific reactivity values of LPG were increased while those of natural gas showed almost constant values.