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이범호(Beomho Lee),조승환(Seunghwan Cho),최지호(Jiho Choi),이대엽(Daeyup Lee),정태형(Taehyung Jeong),이은청(Euncheong Lee),최윤재(Yoonjae Choi) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
A gaseous LPG injection system for SI engines enhances the performance and reduces the emissions compared to the conventional mixer type fuel supply system. Volumetric efficiency of the gaseous LPG injection system has been typically regarded lower than liquefied LPG injection system. In this work, measurements of volumetric efficiency were carried out to investigate the performance of gaseous LPG injection system compared with liquefied injection system. When the length of an intake pipe, injection timing, air/fuel ratio were optimized, the volumetric efficiency with gaseous injection showed little (within experimental error) difference from that of liquefied injection. This demonstrates that a gaseous LPG injection system has an edge over the liquefied injection system in terms of durability and cost reduction.
기체분사 LPG 연료공급시스템을 위한 저차압 타르휠터 개발
이범호(Beomho Lee),조승환(Seunghwan Cho),이대엽(Daeyup Lee),최윤재(Yoonjae Cho),서진수(Jinsoo Seo) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Unsaturated hydrocarbons in domestic LPG fuel for vehicles form tar when vaporized. A LPG fuel also reacts with rubbers in the fuel supply system and forms tar. Tar is also formed by contaminants such as grease and compressor oil in LPG. In order to develop a tar filter, tar was collected from vehicle’s fuel supply system and analyze to investigate its composition. A reference tar consisting of Di-Octyl Phthalate, 2-(Methyl Amino)Ethanol and Methyl Palmitate, which represent the primary three components resulting, respectively, from the main sources of tar formation, was made. Tar filtration characteristics, through a basic study of tar vaporization and filtration test, were measured. And, a filtration media, using pressure drop and filtration performance test, was developed. A filter structure with low pressure resistance was deigned by numerical analysis. A prototype tar filter was developed, and its performance and pressure drop across were measured using engine as well as rig. The experimental results were compared with that of numerical. This study concludes that a tar filter for LPG gaseous injection system satisfying about 2kPa pressure drop across at WOT has been successfully developed.