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논문 기본 정보

자료유형
학술저널
저자정보
한풍규 (현대오트론)
저널정보
한국자동차공학회 한국자동차공학회논문집 한국자동차공학회논문집 제28권 제2호
발행연도
2020.2
수록면
143 - 150 (8page)
DOI
10.7467/KSAE.2020.28.2.143

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초록· 키워드

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Immediately after misfires occur in the gasoline engines of automobiles, engine speed fluctuates significantly. This phenomenon is called post oscillation due to misfires. The engine roughness method, which is currently used in misfire diagnoses in many cars, cannot detect misfires during post oscillation. So, this study aims to present a new misfire detection index that is not affected by post oscillation. The new misfire detection index, called gap slope, is defined as the difference between the two slopes of an engine speed trend line and an engine speed inclination line at all cylinders per cycle. Here, the engine speed trend line is a line that connects the engine speeds of the first and the final teeth per cycle. The engine speed inclination line connects the engine speeds of two specified teeth at all cylinders in the cycle, and its slope reflects the amount of velocity increase due to fuel combustion at the cylinders. Thus, gap slope is defined as the magnitude in the change of the engine angular acceleration per cylinder. Though engine speed vastly fluctuates during post oscillation, it increases and decreases repeatedly at the cylinders regardless of large fluctuations. Thus, this gap slope index can detect misfires during post oscillation. On the other hand, the process of calculating the gap slope index includes the detrend effect by the engine speed trend line, and, thus, it does not require a detrend process by linear regression. Moreover, gap slope is considered hardly affected by machining tolerance, torsional vibration, and difference in air-fuel mixture amount distributed to cylinders. Therefore, misfire detection through the gap slope index becomes much simpler and faster.

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Abstract
1. 서론
2. 본론
3. 결과 및 분석
4. 결론
References

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