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OPTIMIZATION OF EGR AND SPLIT INJECTION STRATEGY FOR LIGHT VEHICLE DIESEL LOW TEMPERATURE COMBUSTION
B. YIN,J. WANG,K. YANG,H. JIA 한국자동차공학회 2014 International journal of automotive technology Vol.15 No.7
Low temperature combustion was developed using a four-cylinder light vehicle diesel engine. Operatingconditions considered were 1600 rpm, 1bar and 3bar IMEP. Both EGR and split injection strategy were optimized in order toobtain the lowest BSFC accompanied with a low level of emissions. It was found that a late injection strategy with high levelsof EGR rate was required for simultaneous reduction of NOx and soot. However, the fuel consumption remains higher thanthe conventional combustion regime. Thus, the optimization study of injection parameters to improve the trade-off betweenNOx and soot emissions while maintaining good fuel efficiency was performed. Several injection pressures were tested. Theresults showed that as injection pressure increased, NOx emissions increased slightly, soot initially decreased sharply, butfurther increase of injection pressure on soot was not obvious at low temperature atmosphere, and might lead to increasedBSFC. Next, split injection strategy was adopted, optimized pilot injection conditions for minimizing fuel consumption werefound at late pilot injection timing with big injection quantity, but little amount of pilot injection could make bettercomprehensive performance of diesel engine. Through multi-parameter collaborative optimization, the emission reductionpath was proposed at operating condition of partial load. Low NOx and soot emissions could be obtained with slightly increaseof fuel consumption.
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한방 진단 시스템(DSOM)를 통한 이명(耳鳴) 환자와 건강대조군의 변증 비교분석
김미보,변석미,신상호,고우신,윤화정,Kim, Mi-Bo,Byin, Seok-Mi,Shin, Sang-Ho,Ko, Woo-Shin,Yoon, Hwa-Jung 대한한방안이비인후피부과학회 2008 한방안이비인후피부과학회지 Vol.21 No.3
Objective : The purpose of this study is to investigate the difference of pathogenesis between tinnitus patients group and healthy volunteers group by using DSOM (Diagnostic system of Oriental Medicine). Methods : Patients group is consisted of people who do not have any disorder except tinnitus, and healthy volunteers group is consisted of people who do not have any special symptom and past history. DSOM was used for pathogenesis investigation of these two groups. Results : There were significant differences between volunteers group and patients group in blood (血虛), dampness (濕), phlegm (痰) (p<0.05), In gender of patients group, deficiency of blood (血虛) was shown with female group statistically more than male group (p<0.05). On the other hand, with volunteers group, there was negligible difference between male and female. In age (over and below 50years), noticeable deficiency of blood (血虛) was shown in patients group. Especially, the old people who are over 50 years showed more deficiency of blood (血虛) than younger group (under 50 years) (p<0.05). With volunteers group, there was only negligible difference. Conclusion : This result showed definite difference in the pathogenesis between tinnitus patiensts group and healthy volunteers group.
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