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http://dx.doi.org/10.3795/KSME-B.2003.27.11.1563

Determination of Air Fuel Ratio According to Fuel Composition (II) -Compensation of Unburned Gas Concentration in Eltinge Chart-  

Ohm, In-Yong (서울산업대학교 기계공학과)
Park, Chan-Jun (서울산업대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.11, 2003 , pp. 1563-1571 More about this Journal
Abstract
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.
Keywords
Air-fuel Ratio; Exhaust Gas; HC Compensation; Eltinge Chart; Spindt Equation;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
연도 인용수 순위
1 Wongeun Lee, Inyong Ohm, 2001, 'Effects of the Method of Changing Compression ratio on Engine Performance in an S1 Engine,' Transaction of Korea Society of Automotive Engineers, Vol. 9, No.4, pp. 27-33 Wongeun Lee, Inyong Ohm, 2001, 'Effects of the Method of Changing Compression ratio on Engine Performance in an SI Engine,' Transaction of Korea Society of Automotive Engineers, Vol. 9, No.4, pp. 27-33   과학기술학회마을
2 Inyong Ohm and Chanjun Park, 2003, 'Determination of Air Fuel Ratio according to Fuel Composition : I -Eltinge Chart as a Reference Exhaust Composition,' Transaction of the KSME submitted   과학기술학회마을
3 Lamont Eltinge, 1968 'Fuel-Air Ratio and Distribution from Exhaust Gas Composition,' SAE Paper 680114
4 Spindt, R.S., 1965, 'Air-Fuel Ratio From Exhaust Gas Analysis,' SAE paper 650507