The absorption and desorption of fuel into oil films is considered to be responsible for a significant proportion of the unburnt hydrocarbon emissions from spark ignition engines. A model has been developed which allows the prediction of the effect of engine parameters on this source. Results show that engine speed, operating temperature and oil-film thickness are controlling parameters. The work highlights the link with ring pack tribology and makes some estimates on the overall effect of temperature and engine speed.
ShoreP. R.TonkinP. R.HC emissions—a question of quality as well as quantity. In Autotech 1991, IMechE Seminar 12 onThe Way Forward—Gasoline Exhaust Emissions, 1991, paper C427/12/163.
2.
IshizawaS.TakagiY.A study of HC emission from a spark ignition engine (the influence of fuel absorbed onto cylinder lubricating oil film)Jap. Soc. Mech. Engrs. Int. J., 1987, 30 (260), 310–317.
3.
GatellierB.TrapyJ.HerrierD.QuelinJ. M.GalliotF.Hydrocarbon emissions of SI engines as influenced by fuel absorption-desorption in oil films. SAE technical paper series 920095, 1992.
4.
WentworthJ. T.Piston and ring variables affect exhaust hydrocarbon emissions. SAE technical paper series 680109, 1968.
5.
HaskellW. W.LegateC. E.Exhaust hydrocarbon emissions from gasoline engines—surface phenomena. SAE technical paper series 720255, 1972.
6.
KaiserE. W.AdamczykA. A.LavoieG. A.The effect of oil layers on the hydrocarbon emissions generated during closed vessel combustion. In Eighteenth Symposium (International) onCombustion, 1980, pp. 1881–1890 (The Combustion Institute).
7.
CarrierG.FendellF.FeldmanP.Cyclic absorption/desorption of gas in a liquid wall filmCombust. Sci. Technol, 1981, 25, 9–19.
8.
DentJ. C.LakshminarayananP. A.A model for absorption and desorption of fuel vapour by cylinder lubricating oil films and its contribution to hydrocarbon emissions. SAE technical paper series 830652, 1983.
9.
ShyyW.AdamsonT. C.Analysis of hydrocarbon emissions from conventional spark ignition enginesCombust. Sci. Technol., 1983, 33, 245–260.
10.
KaiserE. W.LorussoJ. A.LavoieG. A.AdamczykA. A.Short communication: The effect of oil layers on the hydrocarbon emissions from S.I. enginesCombust. Sci. Technol., 1982, 28, 69–73.
11.
SchrammJ.SorensonS. C.Effect of lubricating oil on hydrocarbon emissions in an S.I. engine. SAE technical paper series 890622, 1989.
12.
TrinkerF. H.AndersonR. W.HenigY. I.SieglW. O.KaiserE. W.The effect of engine oil on exhaust hydrocarbon emissions. In IMechE Seminar C435 onWorldwide Engine Emission Standards and How To Meet Them, London, 1991.
13.
KorematsuK.TakahashiS.Effects of fuel absorbed in oil film on unburnt hydrocarbon emissions from spark ignition engines (influence of oil added on piston crown on total hydrocarbon concentration in exhaust gas)Jap. Soc. Mech. Engrs Int. J., 1991, Ser. II, 34 (3), 362–368.
14.
NorrisM. G.HochgrebS.Novel experiment on incylinder desorption of fuel from the oil layer. SAE technical paper series 941963, 1994.
ChappelowC. C.PrausnitzJ. M.Solubilities of gases in high-boiling hydrocarbon solventsAm. Inst. Chem. Engrs J., November 1974, 20 (6), 1097–1103.
17.
SchrammJ.SorensonS. C.Solubility of gasoline components in different lubricants for combustion engines determined by gas-liquid partition chromatographyJ. Chromatography, 1991, 538, 241–248.
18.
RadcliffeC. D.An experimental and analytical study of a piston ring pack. PhD thesis, University of Leeds, 1993.
19.
RadcliffeC. D.DowsonD.Analysis of friction in a modern automotive piston ring pack. InLubricants and Lubrication (Ed. DowsonD.), 1995, pp. 355–365. Proceedings of the Twenty-first Leeds-Lyon Symposium on Tribology (Elsevier Science, Oxford).
MurakamiY.AiharaH.Analysis of mechanism intermixing combustion products in engine oil (quantity and composition of unburned gasoline in engine oil and crankcase gas)Jap. Soc. Mech. Engrs Int. J., 1991, Ser. II, 34 (4), 548–556.
22.
PrausnitzJ. M.ReidR. C.SherwoodT. K.The Properties of Gases and Liquids, Chemical Engineering Series, 3rd edition, 1977 (McGraw-Hill, London).
