潤滑油中の溶解燃料が火花点火機関における未燃焼炭化水素の排出に与える影響 : 第4報,ピストン頂部に形成した油膜の影響

概要

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Absorption and desorption of fuel by motor oil that coats the cylinder side wall with a thin oilfilm is thought to be one of the important sources of unburnt hydrocarbon emissions from spark ignition engines. In order to determine the effect of oil layers on exhaust hydrocarbon emissions, the total hydrocarbon concentration (THC) in the exhaust gas is measured by a flame ionization detector when the constant amounts of motor oil or caster oil are placed on the piston crown. Experiments show that the THC in the exhaust gas increases in proportion to the amount of added oil and that the caster oil addition causes higher increase of the THC than the motor oil addition. A numerical model which describes the process of fuel absorption and desorption in the additional oil layer on the piston crown is developed. Calculated results confirm that the increase of measured THC occurs because the absorbed fuel in the oil layer on the piston crownreleases in the cooling cylinder gas during the expansion and exhaust strokes.
一般社団法人日本機械学会の論文
1990-06-25