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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국자동차공학회 International journal of automotive technology International journal of automotive technology Vol.3 No.1
발행연도
2002.3
수록면
41 - 46 (6page)

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Effect of secondary air injection (SAI) on hydrocarbon reduction has been investigated in a single cylinder SI engine operating at cold-steady/cold-stan conditions. The hydrocarbon emission and exhaust gas temperature with and without catalytic converter were compared with continuous and synchronized SAls. which injected secondary air intermittently into exhaust port. Effects of SAI location, SAI pressure, SAI timing, and location of catalytic convener have been investigated and the results are compared for both SAls with base condition. At cold-steady condition, the rate of HC reduction increased as the location of SAI was closer to the exhaust valve for both synchronized and continuous SAls. The emission of HC decreased with increasing exhaust-A/F when it was rich, and was relatively insensitive when it was lean. The timing of SAI in synchronized SAI had significant effect on HC reduction and exhaust gas temperature and the synchronized SAI was found to be more effective in HC reduction and exhaust gas temperature compared to the continuous SAI. At cold-stan condition, when the catalytic convener was located 20 cm downstream from the exhaust port exit, the catalytic convener warm-up period for both SAIs decreased by about 50%, and the accumulated hydrocarbon emission during the first 120 s decreased about by 56% and 22%, with the synchronized and continuous SAls, respectively, compared to that of the base condition.

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ABSTRACT

1.INTRODUCTION

2.EXPERIMENT

3.RESULTS AND DISCUSSION

4.CONCLUSION

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