Method of operating ethanol fuelled engines

C - Chemistry – Metallurgy – 10 – M

Patent

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Details

C10M 163/00 (2006.01) C10M 129/10 (2006.01) C10M 129/54 (2006.01) C10M 135/10 (2006.01) C10M 159/00 (2006.01) C10M 159/20 (2006.01)

Patent

CA 2724980

A method of operating a compression ignition internal combustion engine which comprises supplying the engine with an aqueous ethanol fuel and lubricating the engine with a lubricating oil composition which mitigates problems of interaction between the oil composition and the fuel, the lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of additives comprising one or more nitrogen- containing dispersant additives and one or more neu-tral or over-based, metal salt- containing detergent additives, the metal salt-containing detergent additives being present in the lu-bricating oil composition at a total metal salt concentration in the lubricating oil composition of greater than 0 and up to 1 % by weight and the weight ratio of the total amount of nitrogen in the dispersant additives : the total amount of metal salt in the deter-gent additives being, at least 0.1 : 1. There is also provided such a lubricating oil composition having a total sulphur content of not greater than 0.44 % by weight.

Linvention concerne un procédé de fonctionnement dun moteur diesel à combustion interne comprenant les étapes consistant à alimenter le moteur en carburant à base déthanol aqueux et à lubrifier le moteur avec une composition dhuile de lubrification atténuant les problèmes dinteraction entre la composition dhuile et le carburant, la composition dhuile de lubrification comprenant une quantité majeure dhuile de base présentant une viscosité de lubrification et une faible quantité dadditifs comprenant un ou plusieurs additifs dispersants contenant de lazote et un ou plusieurs additifs détergents neutres ou surbasés contenant un sel métallique. Les additifs détergents contenant un sel métallique sont présents dans la composition dhuile de lubrification à hauteur dune concentration totale de sel métallique dans la composition dhuile de lubrification supérieure à 0 et allant jusquà 1 % en poids et le rapport pondéral de la quantité totale dazote dans les additifs dispersants sur la quantité totale de sel métallique dans les additifs détergents est dau moins 0,1/1. Linvention concerne également une telle composition dhuile de lubrification présentant une teneur totale en soufre ne dépassant pas 0,44 % en poids.

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