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Experimental Study on Characteristics for CNG Electronic Pressure Regulator
전자식 CNG 레귤레이터의 특성에 관한 실험적 연구

Chungwoo Nam, Hokil Lee, Seongjoon Moon, Jaekwang Kim, Guho Kim, Kangyoon Lee
2017 Transactions of Korean Society of Automotive Engineers  
요 약 국내 CNG Bi-fuel Kit를 개조한 차량들은 대부분 Diaphragm 감압방식을 적용한 기계식 레귤레이터를 장착하 여 운행 중에 있다. 하지만 Diaphragm의 재질 특성 및 기계식 압력제어 방식의 특성 상 다양한 문제점들이 발생 되고 있으며, 이를 개선하기 위한 연구들이 진행되고 있다. 본 연구에서는 CNG 차량용 레귤레이터의 압력제어 방식에 따른 성능특성 확인 및 비교 분석 진행을 통해 개선방안을 도출하고자 하였다. 실험 결과에 따르면 Diaphragm을 적용한 감압방식이 Piston을 적용한 방식보다 일반적인 성능에서 유리하였으나 주변 온도환경 변 화에 따른 변동 폭이 큰 것을 확인하였다. 또한 전자식 압력제어를 통해 레귤레이터의 일반적인 성능을 향상시 킬 수 있음을 확인하였다. Abstract -The domestic vehicles remodeling the "CNG Bi-fuel Kit" are mostly in operation with
more » ... g the mechanical regulator applying the Diaphragm. However, due to the material characteristics of Diaphragm and characteristics of mechanical pressure control method, various problems are happening. This study tries to deduce the improvement plan through the checking of performance characteristics according to the pressure control method of CNG regulator and progress of comparative analysis. According to the test result, the decompression method applying the Diaphragm has advantage compared to the method applying the Piston. Furthermore, it was confirmed that through the electronic pressure control, it is possible to improve the general performance of the regulator.
doi:10.7467/ksae.2017.25.5.525 fatcat:6rxdcurcxrfdjgphrtmfyuyqaa

An Experimental Study on Characteristics of Engine Oil Diluted by a Bio-Alcohol Mixture Fuel
바이오알코올 혼합연료의 엔진오일 희석특성에 대한 실험적 연구

HyunJun Kim, HoKil Lee, SeDoo Oh, Shin Kim
2016 Journal of the Korean Society of Tribologists and Lubrication Engineers  
Engine oil plays an important role in the mechanical lubrication and cooling of a vehicle engine. Recently, engine development has focused on the adoption of gasoline direct injection (GDI) and turbocharging methodology to achieve high-power and high-speed performance. However, oil dilution is a problem for GDI engines. Oil dilution occurs owing to high-pressure fuel injection into the combustion chamber when the engine is cold. The chemical components of engine oil are currently developed to
more » ... commodate gasoline fuel; however, bio-alcohol mixtures have become a recent trend in fuel development. Bio-alcohol fuels are alternatives to fossil fuels that can reduce vehicle emissions levels and greenhouse gas pollution. Therefore, the chemical components of engine oil should be improved to accommodate bio-alcohol fuels. This study employs a 2.0 L turbo-gas direct injection (T-GDI) engine in an experiment that dilutes oil with fuel. The experiment utilizes a variety of fuels, including sub-octane gasoline fuel (E0) and a bio-alcohol fuel mixture (Ethanol E3~E7). The results show that the lowest amount of oil dilution occurs when using E3 fuel. Analyzing the diluted engine oil by measuring density and moisture with respect to kinematic viscosity shows that the lowest values of these parameters occur when testing E3 fuel. The reason is confirmed to influence the vapor pressure of the low concentration bio-alcohol-fuel mixture.
doi:10.9725/kstle.2016.32.6.183 fatcat:di7n4p73incldao5m6kqimihqm

Page 103 of Engineering and Mining Journal Vol. 34, Issue 8 [page]

1882 Engineering and Mining Journal  
|Nev....|. .| 97,966 Hie oh Inyo Cons., @........0¢ HOMB sc oc wwcwwiesa|esss'er ol 77,000 Hokill pagerech, Beenie peewee a. Sic eeiee.) ipesanese oa oa seeee ron Silver,s .........  ...  .| olo... m«¢ tote teleeeeeee|eeee eee lave seeleveeeee Jeceeccelecececelecesecsleceeees |eesseeelecececelecccseelenccoes Lees nee eae Wobtail, @.. .... | Pere — pais cessibene sae esaaetes Pe dacunubsemenern  ... 

Page 84 of Engineering and Mining Journal Vol. 33, Issue 6 [page]

1882 Engineering and Mining Journal  
E, Lee, Co.| 500) 50 50 Jy 81) 10] ..... = : cick Savage, Ne... 112| 100496 Ja $2)" 5)) 4460 Ju 69/3 00 hannock has had a moderate business within the range ) 3 a A Sierra Nov., Ne...| 100| 100) 4850)  ...  Jovees | §800\Fe 82) 75) 1734] ..... 126 ; | Hokill, Co........ 200} 5] * |...... 1. .0c| S20|De S| 10|......)...... is ular prices, selling from 50c. up to 88c. and back | Idaho, Ca beeesbeny 8100) 100  ... 

Page 159 of Engineering and Mining Journal Vol. 24, Issue 8 [page]

1877 Engineering and Mining Journal  
Joseph, 1 aie Lee 900,000 30,009 > cai bien sbeaenEl eos aes iesseboas val oo [SO es | 3a or Fan me eee Els aces eee | Santiago, @ Bete — l2fooaes., 1,000,000 tom | 549,000| Dec. |t876| 1 00!  ...  . :200,000| 112,000 ¢ penance sp. otk “9 | s+ {os | OR) O44) 5 Hokill, a. ah tteeeeee re 3,000 | 2,000,000] 80,000 real oe 6,000/Saly 11877| 0 sc|_ 1,598,000 Apr. |13 pees | | | } 9 | 87 | 918%) 9 ‘| I  ... 

Page 96 of Engineering and Mining Journal Vol. 33, Issue 7 [page]

1882 Engineering and Mining Journal  
Lee, Co.| 590) 540}......|.. ....| . 5O|SY 81 as cele oere Savage, Ne... oe 112} 100) 5106 Ja Be ; 5 4160) Ju 89 5 ae aa “4 : ? Sie-ra N-v., Ne... i 3U e uu Zi Ja i Silver King, Ar...| 100!  ...  Excelsior, 10 ; Findley. 700 ; Gold Strive, 300 ; Great 200 ; Bodie Consclidated, 1090 ; Bulwer, 1100 ; California, ; Consolidated Virginia, 12,485 ; Copper oe ae : tern, 00; Homestake, 10; Horn-Silver, 200; Hokill  ... 

Page 119 of Engineering and Mining Journal Vol. 24, Issue 6 [page]

1877 Engineering and Mining Journal  
Pe ce eee eee ee jor 4 1 sees Hokill, @.8..........]  ...  0 10, 12 Bs ME eh de Lee Pe t ok Ie ae "400 Seg. Belcher. eg. s .... Nev 160 640,000 6,400 | 100! 244,800) Apr. |1876) 5 00 |... soa ea P | °. ; wit" \ 400 Sierra Nevada G.s...  ... 

Page 297 of National Union Catalog Vol. 94, Issue [page]

National Union Catalog  
Florence Lee. My travels and adventures in Alaska, by Mrs.  ...  Hokill ... Washington U. S. Govt. Sg oe 1937, cover-title. ~ eres, Gos. 24". 5S p. (U. 8. Dept. of agricul- ture. Technical Puttetio Do.  ... 


1868 Bijdragen tot de Taal-, Land- en Volkenkunde van Nederlandsch-Indië  
Die welke te Latoe wonen, komen wei eens voor hetzelfde doel over de Way-lee op bet grondgebied van Roemakey.  ...  Zij gaan de op den berg Panharo ontspringende Talla-rivier op en dalen in de even cens daar ontspringende Way-lee af om koppen te suellen.  ... 

Index of subjects

1912 Journal of the Chemical Society Abstracts  
BAUDREXEL, and DIET-RICH), A., ii, 466. recovery of, from animal tissues (HANZLIK), A., ii, 302. excretion of, by the animal organism (VOLTZ, BAUDKEXEL, and DIET-RICH) A., ii, 466. action of, on muscle (LEE  ...  oxirrie (ROSENMUND, MANKICH, and JACOBSOHS), A,, i , 967. 2:4-Dimethoxy-5-benzy1pyrimidine7 6chloro-(IhSI}, A, i, 1023. 3:4-Dimethoxy-a-6-bromo-3-methoxyphenylcinnamic acid, 2-a1iiino-, and 2ilitro-(PS(;HOKIL  ... 
doi:10.1039/ca9120206381 fatcat:jmvbu3dotbaqfhsvbyqfc4bkqy