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크랭크축 각속도의 변동을 이용한 실린더내 압력 변화 추정 ( 2 )
임병진(B. J. Lim),박종범(J. B. Park),임인건(I. K. Lim),배상수(S. S. Bae),김응서(E. S. Kim) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.2
This paper proposes a new method to investigate combustion phenomena using the variation of crankshaft speed, From the idea that the variation of crankshaft speed contains the information of combustion, the energy method is applied as a single degree of freedom.<br/> Through the comparison of measured and calculated crankshaft speed. the proposed energy model is proved to be effective. When the crankshaft speed is used in the energy equation, filtering of the speed is required. The frequency components of cylinder pressure are analyzed and the coefficients of Fourier series above the twelfth frequency of engine speed are considered as a noise. As an example of application of this research. some combustion analyses like mean effective pressure, heat release rate, and misfire detection were carried out.
배상수(S.S.Pae),임인건(I.K.Lim),김세웅(S.W.Kim),김응서(E.S.Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.2
This paper presents the characteristics of the crankshaft speed fluctuations. To analyze them, the speed waveforms were measured both at the flywheel and at the front end of the engine. The speed waveform measured at the flywheel shows better result than at the front end one, because of the torsional vibration and the auxiliary components. And the patterns of the speed fluctuations are classified into three region, such as low load, middle load and high load region with the variations of the loads. Additionally, as the engine speeds increase and the loads decrease, the analysis of the speed becomes more difficult due to lower variation of the speed. And in an the regions, the main frequency component of the speed fluctuation is firing frequency.
크랭크축 각속도의 변동을 이용한 실린더내 압력 변화 추정(2)
임병진(B.J.Lim),박종범(J.B.Park),임인건(I.K.Lim),배상수(S.S.Bae),김응서(E.S.Kim) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper propose a new method to investigate combustion phenomena using the variation of crankshaft speed. From the idea which the variation of crankshaft speed contains the information of combustion the energy method is applied as a single degree of freedom. Through the comparison of measured and calculated<br/> crankshaft speed the proposed energy model is proved to be moderate. When the crankshaft speed is used in the energy equation filtering of speed is required. The frequency components of cylinder pressure is analyzed and<br/> the coefficients of Fourier series above the twelfth frequency of engine speed is considered as a noise. As an example for application of this research some combustion analysis like as mean effective pressure and heat<br/> release rate, and misfire detection were carried out.<br/>
[論文] Development and Use of PC Based Combustion Analyzer
임병진(B. J. Lim),임인건(I. K. Lim),김응서(E. S. Kim) 한국자동차공학회 1993 오토저널 Vol.15 No.3
널리 사용되는 IBM-PC를 기본으로 하여 고속도 데이터 처리가 가능한 연소 해석 장치를 개발하였다. 본 시스템은 상용의 A/D 변환기와 C언어를 사용한 소프트웨어 및 PC인터페이스 보드로 구성되어있다.<br/> 본 연소 해석 장치의 특징은 모든 기능이 모니터 상에서 마우스로 지원되며,PC상에서 타 프로그램을 위한 단기통 기관실험을 통하여 본 시스템을 검증하였다. 연소실 내의 압력은 크랭크 각독로 0.1˚에서 1˚의 해상도로 분석할수 있다.
임병진(B. J. Lim),박종범(J. B. Park),임인건(I. K. Lim),배상수(S. S. Bae),김응서(E. S. Kim) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.3
This paper describes the method to investigate combustion pressure in the cylinder without modifications of engine. Assuming engine dynamics as a single degree of freedom cylinder pressure is estimated using the variation of crank shaft speed. For this study pressure, crank shaft sped, and load are sampled by the crank angle. This study suggests the variation of crank shaft speed can be used as parameters of feedback engine control.<br/>
배상수(S.S. Pae),임병진(B.J. Lim),임인건(I.K. Lim),박종범(J.B. Park),김응서(E.S. Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This paper presents the characteristics of the crankshaft speed fluctuations. To do this, the speed waveforms were measured both at the flywheel and the front end of the engine. The speed waveform measured at the flywheel shows better result than at the front end one, because of the torsionai vibration and the auxiliary components. And the patterns of the speed fluctuations are classified into three region, such as low load, middle load and high load region with the variations of the loads. Additionally, as the engine speeds increase and the loads decrease, the analysis of the speed becomes more difficult due to the lower variation of the speed. And in all the regions, the main frequency component of the speed fluctuation is firing frequency.<br/>
크랭크축 각속도의 변동을 이용한 실화 판정 ( 2 ) - 실차 실험 -
배상수(S. S. Bae),김세웅(S. W. Kim),임인건(I. K. Lim),김응서(E. S. Kim) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
To keep up with the regulation of OBD II (on board diagnostics II), many detection methods for engine misfire have been developed. Among them, the method of using the crankshaft speed fluctuation is the most noticeable in the point of view of lower cost and easier installation than any others. On the basis of the results obtained from the previous engine-dynamometer test, the integrating torque index (ITI) has been introduced.<br/> In this research, the instrumental and the interfacing systems to engine control unit(ECU) are developed for the vehicle test. Therefore, the vehicle and chassis-dynamometer test can be carried out in addition to the rough road test. From this test, the previous proposed method proved that it can be applied to the real vehicle.<br/>