EGR equipped diesel engines and lubricating oil compositions
AssigneeInfineum International Limited
InventorsAndrew J. D. Ritchie, Jai G. Bansal, Jacob Emert, Glen P. Fetterman, Antonio Gutierrez, Matthew D. Irving, Christopher J. Locke, Michael T. Minotti
Life of this patent
Estimating the term…
Abstract
Soot induced kinematic viscosity increase of lubricating oil compositions for heavy duty diesel engines equipped with EGR systems operating in a condensing mode can be ameliorated by selection of viscosity modifier, lubricating oil flow improvers, detergents and dispersants.
Claims40
A heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, said engine being lubricated with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more high molecular weight polymers comprising (i) copolymers of hydrogenated poly(monovinyl aromatic hydrocarbon) and poly (conjugated diene), wherein the hydrogenated poly(monovinyl aromatic hydrocarbon) segment comprises at least about 20 wt. % of the copolymer;
- (ii) olefin copolymers containing alkyl or aryl amine, or amide groups, nitrogen-containing heterocyclic groups or ester linkages and/or (iii) acrylate or alkylacrylate copolymer derivatives having dispersing groups.
A heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, said engine being lubricated with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more neutral and/overbased metal-containing detergents, wherein from about 50% to 100% of the one or more detergents are phenate and/or salicylate detergents.
A heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, said engine being lubricated with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more nitrogen-containing dispersants wherein greater than 50 wt. % of the dispersant nitrogen is non-basic.
A method of operating a heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, for at least 15,000 without a change of lubricating oil, which method comprises lubricating said engine with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more high molecular weight polymers comprising (i) copolymers of hydrogenated poly(monovinyl aromatic hydrocarbon) and poly (conjugated diene), wherein the hydrogenated poly(monovinyl aromatic hydrocarbon) segment comprises at least about 20 wt. % of the copolymer;
- (ii) olefin copolymers containing alkyl or aryl amine, or amide groups, nitrogen-containing heterocylclic groups or ester linkages and/or (iii) acrylate or alkylacrylate copolymer derivatives having dispersing groups.
A method of operating a heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, for at least 15,000 without a change of lubricating oil, which method comprises lubricating said engine with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more neutral and/overbased metal-containing detergents, wherein from about 50% to 100% of the one or more detergents are phenate and/or salicylate detergents.
A method of operating a heavy duty diesel engine provided with an exhaust gas recirculation system in which intake air and/or exhaust gas recirculation streams are cooled to below the dew point for at least 10% of the time said engine is in operation, for at least 15,000 without a change of lubricating oil, which method comprises lubricating said engine with a lubricating oil composition comprising a major amount of oil of lubricating viscosity, and a minor amount of one or more nitrogen-containing dispersants wherein greater than 50 wt. % of the dispersant nitrogen is non-basic.
Dependencies are inferred from the claim text.