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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 2003년 추계학술대회논문집 1호
발행연도
2003.11
수록면
366 - 371 (6page)

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초록· 키워드

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To meet stringent emissions standards, a considerable amount of development is necessary to ensure the suitable efficiency and durability of catalyst systems in SI engines. The close-coupled catalyst performance should satisfy
ULEV emission levels after aging at 1050 °C for 24 hours. However, if some malfunctions occurred at engine operation and the catalyst temperature exceeds the 10500°C, the catalytic converter is deactivated and shows the poor
conversion efficiency. In that situation, excess fuel is injected intentionally to lower the exhaust temperature. Hence,
it resulted in worse fuel economy. In this work, the exhaust cooling system was proposed to lower the exhaust temperature in an SI engine. The cooling systems in exhaust manifold were developed and cooling efficiencies were compared. The heat flux from the exhaust gas into the coolant in the heat exchanger was calculated using the measured coolant temperatures. Exhaust gas temperatures were calculated analytically as a function of engine speed and load. Surface temperature distribution in exhaust manifold was also calculated analytically to investigate the behaviors of cooling systems.

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ABSTRACT

1.Introduction

2.Experimental discussions

3.Analytical approach

4.Results and discussions

5.Conclusions

Acknowledgement

References

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