• Title/Summary/Keyword: 점화시기

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A Study on Natural Gas Vehicle Conversion by Diesel Engine Improvement (디젤엔진개량에 의한 천연가스차량전환에 관한 연구)

  • Han, Yeong Chul;O, Yong Seok;Na, Wan Yong
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.8 no.2
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    • pp.94-94
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    • 1999
  • Natural gas is considered to be on e of the most promising candidates for a clean substitute fuel and a great amount of research on the compressed natural gas(CNG) fueled vehicle has been performed. In this s tudy, we try to understand the property of CNG fuel with using CNG engine experiment. In order to present the direction and application of CNG, we experiment with various operating conditions that is, spark timing, A/F ratio, air quantity and fuel quantity, etc. 11,967 cc engine was used in the experiment and the engine fuel ratio was determined in the way that the performance of dedicated CNG engine is corresponded to that of existing diesel engine. The performance and dedicated CNG engine were measured by changing the fuel injection timing. The dedicated CNG engine was proved to be good in describing the experimental results and according to the actual road test, acceleration and constant speed driving for dedicated CNG engine was better than existing diesel engine.

Study for Failure Examples Involved to Spark Plug Assembling Part Damage, Timing Maladjustment and Alien Substance Insertion in Intake Valve Part on LPG Vehicle Engine (자동차용 LPG 엔진의 점화플러그 장착 부 손상, 점화시기 조정불량, 흡입밸브 부 이물질유입 고장사례 연구)

  • Lee, IL Kwon;Kook, Chang Ho;Ham, Sung Hoon;Kim, Sung Mo;Hwang, Han Sub;Jung, Dong Hwa;Moon, Hak Hoon;Lee, Jeong Ho
    • Journal of the Korean Institute of Gas
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    • v.25 no.2
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    • pp.22-27
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    • 2021
  • This paper is a purpose to study the failure examples for LPG vehicle. The first example, the researcher certified the incongruity phenomenon decreased engine power by ignition fire leakage because of spark plug threaded part damage assembling in cylinder head. The second example, the timing mark that accurately adjusting the camshaft and crankshaft position were twisted about 0.5 block each other. Finally, the researcher seeked the disharmony phenomenon as it couldn't set ignition timing. The third example, the researcher knew the failure phenomenon by interrupted the closing period for intake valve moving with air flow in the number 3 port of cylinder head as the foreign substance in cylinder head didn't remove. Therefore, the manager of a car has to thorough going inspect and the manufacture of a car must remove the cause of failure with quality assurance.

A Study on Cyclic Variation by Idling in Gasoline Vehicle (가솔린자동차의 무부하 운전에서 사이클변동에 관한 연구)

  • Han, Sung-Bin;Kim, Sung-Mo
    • Journal of Energy Engineering
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    • v.18 no.3
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    • pp.156-162
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    • 2009
  • Cylinder-pressure based combustion analysis provides a mechanism through which a combustion researcher can understand the combustion process. This paper was to identify the most significant sources of cycle-to-cycle combustion variability in a spark ignition engine at idle. To analyse the cyclic variation in the test engine, the burn parameters are determined on a cycle-to-cycle basis through analysis of the engine pressure data. The burn rate analysis program was used in the analysis of the data. Burn parameters were used to determine the variations in the input parameter-i.e., fuel, air, residual mass, and so on.

An Experimental Study of Cyclic Combustion Characteristics at Starting and Idling Phase on Spark Ignition Engine (SI 엔진의 시동 및 아이들 구간에서의 점화시기에 따른 싸이클별 연소현상에 관한 실험적 연구)

  • Choi, Seong-Won;Choi, Kwan-Hee;Myung, Cha-Lee;Park, Sim-Soo
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.3317-3322
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    • 2007
  • THC(Total Hydrocarbon) emissions during cold start and warm-up phase constitute the majority of THC emissions during the FTP-75 mode. As the basic approach to improve the emission performance of Gasoline engine during transient phase, the effect of spark timing retard from MBT on THC emission characteristics is studied by engine test using a Fast response Flame Ionization Detector(FFID). A cyclic analysis of the combustion process shows that high THC emissions are produced first few cycles during the transient phase. This paper presents the results of engine performance and emission of Gasoline engine with various spark timing. consequently, This paper was focused on the combustion phenomena with various spark timing during transient phase which was analyzed by Fast response Flame Ionization Detector (FFID) equipment to measure the cyclic THC emission characteristics.

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Prediction of Ignition Delay for HSDI Diesel Engine (고속 직분식 디젤 엔진에서의 점화지연시기 예측)

  • Lim, Jae-Man;Kim, Yong-Rae;Ohn, Hyung-Suk;Min, Kyoung-Doug
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.1704-1709
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    • 2004
  • New reduced chemical kinetic mechanism for prediction of autoignition process of HSDI diesel engine was investigated. For precise prediction of the ignition characteristics of diesel fuel, mechanism coefficients were fitted by the experimental results of ignition delay of diesel spray in a constant volume vessel. Ignition delay of diesel engine on various operation condition was calculated based on the new reduced chemical mechanism. The calculation results agreed well with experimental data.

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A Study on the Idle Speed Control under Load Disturbance (부하변동에 강인한 엔진 공회전 속도제어에 관한 연구)

  • 최후락;장광수
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.5
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    • pp.37-50
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    • 1997
  • The objective of this paper is to study on the idle speed control using the fuzzy logic controller under load disturbance. The design procedure for fuzzy logic controller depends on the expert's knowledge or trial and error. The inputs of the fuzzy controller are error of rpm and variation of rpm. The output of the fuzzy controller is an ISC motor step and ignition timing. The airflow is controlled by the ISC motor movement and the idle speed is controlled by the airflow control and ignition timing control. During the control, air to fuel was checked by LAMBDA sensor. All experiments were performed in a real vehicle.

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A Study on the Improvement of the Sound Quality of the Interior Noise of A/T Vehicle in Idle State (공 회전시 자동변속기 차량의 실내소음 음질 개선에 관한 연구)

  • 이상권;최병욱;여승동
    • Transactions of the Korean Society of Automotive Engineers
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    • v.1 no.1
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    • pp.110-119
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    • 1993
  • 본 논문은 자동변속기를 탑재한 차량에서 에어콘(air condition)을 작동시키고, 공 회전시 기어의 변속을 "D"단에 두었을 때 실내에서 발생하는 이상음의 원인규명 및 해결 방 법에 관한 연구 결과를 논하고자 한다. 이 이상한 소음의 원인을 규명하기 위하여 실린더 내부의 연소압력, 메인 베어링캡(main bearing cap)의 진동, 엔진 마운팅 보스의 진동 및 차 량의 실내소음을 동시에 측정하여 분석하였으며 이 결과에 의하면 이상음의 원인은 크랭크 샤프트(crank shaft)의 굽힘진동이 파워플랜트(power plant)를 가진하여 진동을 증가시키고, 이 진동이 마운팅 보스를 통하여 차량의 차체에 전달되며, 차체의 진동에 의해서 발생하는 고체 전달음(structure-borne noise)이었다. 또한 이상음의 주기는 주파수 성분은 200-400Hz 이었다. 이 이상음은 크랭크 샤프트의 댐퍼 풀리의 질량을 저감하여 크랭크 샤프트의 동특 성을 개선함으로서 해결가능하고, 혹은 점화시기를 지연하여 연소 압력을 낮춤으로서 해결 가능하다.

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Method of Decreasing the Deviation of Corrected Engine Torque using Knock Correction Rate in Gasoline Engine Performance Test on Dynamometer (가솔린엔진 대상 성능시험시의 노킹보정률을 사용한 엔진 수정토크의 편차개선)

  • Cho, Yoon-Ho;Kim, Woo-Tai;Bae, Choong-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.4
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    • pp.1-7
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    • 2008
  • Recent trends of development in small size gasoline engines are both to have higher compression ratio for the purpose of improved fuel consumption and to advance spark timing up to DBL in a low to mid engine speed region for a good acceleration performance of vehicles. However, there occurs the deviation of corrected engine torque results during engine performance test on dynamometer because test conditions influence the onset of knock. Therefore, this research shows the test deviation of corrected engine torque decreases when knock correction rate is used.

Computer Simulation of Fuel States and Spark Timing in Engine Model (엔진모델에서의 연료상태와 점화시기의 컴퓨터 해석)

  • Lee, Deog-Kyoo;Kim, You-Nam;Park, Hee-Chul;Woo, Kwang-Bang
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.89-93
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    • 1989
  • In this paper, a mathematical engine model based on the actual engine operation is formulated to be adapted for the evalution and development of engine control system. In the model the classification of fuel paticle siza is considered. The model is simulated through the mathematical interpretation of intake manifold in the rapidly-accerated state. The spark-timing is analyzed with respect to engine r.p.m. The result shows that the model behaves similar performance to the actual engine operation and the spark-timing is very important to the characterization of engine r.p.m..

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A Study on the Comparison of Fuel Combustion Characteristics between Gasoline and Liquified Petroleum Gas on SI Engine (SI 엔진에서의 가솔린과 액화석유가스 연료의 연소특성 비교 연구)

  • Park, S.C.;Ko, Y.N.;Kwon, Y.W.
    • Journal of Power System Engineering
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    • v.12 no.4
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    • pp.12-17
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    • 2008
  • The purpose of this study is to analyse and compare the fuel combustion characteristics between LPG and gasoline on SI engine. Pressures of combustion chamber were measured on the state that engine speed was 2000rpm and BMEP was 2.0bar And we measured pressures of combustion chamber regarding variation of the MBT We could know that the combustion pressure of LPG fuel use engine is appeared lower than that of gasoline fuel use engine. At the lean mixture ratio area we could blow that Ignition timings are pulled very forward, and ignition timing of LPG fuel is advanced to $5\sim12^{\circ}$ CA than gasoline fuel. We learned that the value of coefficient of variation of LPG fuel is higher than gasoline fuel.

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