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연료 조성에 따른 공연비 산정 (II) -Eltinge 차트에서 미연 성분의 보상-
엄인용,박찬준,Ohm, In-Yong,Park, Chan-Jun 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.11
This paper is the second part of several companion papers which compare the method of Air-fuel ratio(AFR) determination. In the previous paper, Eltinge chart was applied to the arbitrary fuel composition and the charts for gasoline, diesel, methanol, M85, liquefied petroleum gas(LPG), natural gas(NG), propane and butane were illustrated. In Eltinge chart, however, unburned hydrocarbon (UHC) is not used for determination of AFR. For improving accuracy, Eltinge suggested UHC compensation after the AFR reading in the chart. This compensation reduced the difference between real and reading value. In the compensation, however, the correction of oxygen and carbon dioxide is uncertain and there might be a mistake in conversion of UHC reading value. Therefore, the error is overestimated comparing with Spindt one which is most widely used. In addition, there is no comparison of the value with other useful methods. In this paper, the compensation of unburned HC was performed in Eltinge chart and the compensated value was compared with Spindts formula over wide range of AFR. The objects of investigating fuel are gasoline, methanol, NG and LPG. The result shows that Eltinge and Spindt method is flawlessly compatible and the difference between the two methods is under 0.3% in a λrange from 0.9 to 1.7. The method fur debugging instrumentation error is also presented.
김득상(Duk-Sang Kim),강봉균(Bong-Gyun Kang),양창석(Chang-Seok Yang),엄인용(In- Yong Ohm),조용석(Yong-Seok Cho) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_1
UEGI (Unburned Exhaust Gas Ignition) is an alternative method for fast light-off of a catalytic converter. It ignites unberned exhaust mixture using two glow plugs installed in the upstream of the close-coupled catalysts(CCC). In addition, a hydrocarbon adsorber was applied to the UEGI system, for more effective reduction of HC emission. Engine bench tests show that the CCC reaches the light-off temperature faster compared with the Baseline exhaust system and HC and CO emissions are reduced significantly during the cold start. From vehicle tests it was observed that HC emission was reduced effectively, even the catalysts were aged. It is expected to develop a solution kit applicable to a new vehicle or used one, to meet the stringent emission regulations.<br/>