http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
최회명,이정우,Kookeui Hong,Sangyul Lee,최승목,Seongeun Yu,민경덕 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.7
To draw a comparison of the effect of multiple injection strategy on the engine-out emissions under two different EGR rate conditions,the effect of pilot injection on emissions and combustion was evaluated and discussed in part 1. Thus, in the second research as part 2, the effects of post injection on the engine-out emissions were systemically evaluated for two different EGR rate conditions (30 % and 60 %). Since the behavior of diesel combustion is significantly different as EGR rate is changed, the characteristics of post injection was different between two EGR rate conditions. This research was investigated as varying injection parameters such as the timing and quantity of the post injection. The results show that the close post injection with injection interval as 10 degree has the potential to reduce PM emission,regardless of EGR rate. However, the reason of reduction of PM emission is different for each case. For a moderate EGR rate condition,close post injection with interval 10 degree enhances the fuel at bottom of bowl. Thus, the distribution of fuel can be improved. On the other hand, for a heavy EGR rate condition, close post injection with interval 10 degree has the charge cooling effect to prolong the ignition delay, rather than well-matched injection targeting. Especially, there is an effect to oxidize PM emission under moderate EGR rate condition as post injection is applied. However, post injection for late cycle of combustion under heavy EGR rate condition does not oxidize PM emission due to low oxygen concentration (~ 10%).
HSDI 디젤 엔진 블록 진동 신호 중 연소가진성분 분리에 대한 실험적 연구
최회명(Hoimyung Choi),이승현(Seunghyun Lee),김영관(Younggwan Kim),정인수(Insoo Jung),이진우(Jin Woo Lee),민경덕(Koungdoug Min) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study is the experimental research on how to separate combustion-induced vibration component from vibration signal measured on the cylinder block of HSDI EURO-5 diesel engine. The typical separation method to compare the motoring condition and firing one cannot be used in this case because a high pressure fuel injection system in HSDI engine occurs much vibration when it works. Therefore, a new signal separation method is suggested to compare the signals measured in motoring, firing and additional misfiring condition. To implement the suggested method, measured vibration signals are analyzed in time and frequency domain by using the Wavelet transform.