The present invention relates to lubricating oils, and in particular to the use of lubricating oils with low sulphur content in combination with a low sulphur fuel to reduce particulate emissions of a diesel engine equipped with a particulate trap. Thus, there is provided the use of an engine lubric
The present invention relates to lubricating oils, and in particular to the use of lubricating oils with low sulphur content in combination with a low sulphur fuel to reduce particulate emissions of a diesel engine equipped with a particulate trap. Thus, there is provided the use of an engine lubricating oil having a low sulphur content in combination with a fuel having a low sulphur content, to reduce the emissions of nucleation mode particles from a diesel engine fitted with a particulate trap. There is also provided a method of reducing the number of nucleation mode particles in the emissions from a diesel engine fitted with a particulate trap, which method comprises using an engine lubricating oil having a low sulphur content in combination with a fuel having a low sulphur content.
대표청구항▼
The invention claimed is: 1. A method of reducing the number of nucleation mode particles in the emissions from a heavy duty diesel engine fitted with a catalyzed particulate trap, which is a continuously regenerating trap (CRT™) comprising both an oxidation catalyst and a particulate trap,
The invention claimed is: 1. A method of reducing the number of nucleation mode particles in the emissions from a heavy duty diesel engine fitted with a catalyzed particulate trap, which is a continuously regenerating trap (CRT™) comprising both an oxidation catalyst and a particulate trap, which method comprises lubricating a heavy duty diesel engine with a lubricating oil consisting essentially of an anti-wear, anti-oxidant and corrosion-inhibiting lubricating oil having a low sulphur content of less than 0.4% by weight and comprising ZDDP and optionally at least one additional additive selected from the group consisting of an anti-wear additive, an anti-oxidant additive, a corrosion inhibitor, an anti-foam additive, a Viscosity Index improver and a dispersant, wherein ZDDP is present at a concentration of up to 0.4 percent by weight, and employing a fuel having a low sulphur content of below 50 ppm by weight, to thereby reduce the emissions of nucleation mode particles from the heavy duty diesel engine fitted with a catalyzed particulate trap, wherein the nucleation mode particles have a diameter in the range of between about 3 nm and 7nm. 2. A method according to claim 1, wherein the sulphur content (by weight) of the fuel is below 20 ppm. 3. A method according to claim 2, wherein the sulphur content (by weight) of the fuel is 10 ppm or lower. 4. A method according to claim 1, wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.3%. 5. A method according to claim 4, wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.2%. 6. A method according to claim 5, wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.15%. 7. A method according to claim 1, wherein the low sulphur lubricating oil comprises one or more anti-wear additives selected from the group consisting of (a) molybdenum containing compounds, (b) organic based friction modifiers, and (c) salicylate-type detergents. 8. A method according to claim 1, wherein the low sulphur lubricating oil comprises one or more anti-oxidant additives selected from the group consisting of aromatic amines and phenolic compounds. 9. A method according to claim 1, wherein the low sulphur lubricating oil comprises one or more corrosion inhibitor additives selected from the non-sulphur detergent additives. 10. A method according to claim 1, wherein the low sulphur lubricating oil comprises one or more other additives selected from one or more of anti-foam additives, Viscosity Index improvers and dispersants. 11. A method according to claim 2 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.3%. 12. A method according to claim 3 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.3%. 13. A method according to claim 2 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.2%. 14. A method according to claim 3 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.2%. 15. A method according to claim 2 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.15%. 16. A method according to claim 3 wherein the low sulphur lubricating oil has a sulphur content (by weight) of less than 0.15%. 17. A method according to claim 2, wherein the low sulphur lubricating oil comprises one or more anti-wear additives selected from the group consisting of (a) molybdenum containing compounds, (b) organic based friction modifiers, and (c) salicylate-type detergents. 18. A method according to claim 2, wherein the low sulphur lubricating oil comprises one or more anti-oxidant additives selected from the group consisting of aromatic amines and phenolic compounds. 19. A method according to claim 2, wherein the low sulphur lubricating oil comprises one or more corrosion inhibitor additives selected from the non-sulphur detergent additives. 20. A method according to claim 2, wherein the low sulphur lubricating oil comprises one or more other additives selected from one or more of anti-foam additives, Viscosity Index improvers and dispersants. 21. A method according to claim 3, wherein the low sulphur lubricating oil comprises one or more anti-wear additives selected from the group consisting of (a) molybdenum containing compounds, (b) organic based friction modifiers, and (c) salicylate-type detergents. 22. A method according to claim 3, wherein the low sulphur lubricating oil comprises one or more anti-oxidant additives selected from the group consisting of aromatic amines and phenolic compounds. 23. A method according to claim 3, wherein the low sulphur lubricating oil comprises one or more corrosion inhibitor additives selected from the non-sulphur detergent additives. 24. A method according to claim 3, wherein the low sulphur lubricating oil comprises one or more other additives selected from one or more of anti-foam additives, Viscosity Index improvers and dispersants. 25. A method according to claim 14, wherein the low sulphur lubricating oil comprises one or more anti-wear additives selected from the group consisting of (a) molybdenum containing compounds, (b) organic based friction modifiers, and (c) salicylate-type detergents. 26. A method according to claim 14, wherein the low sulphur lubricating oil comprises one or more anti-oxidant additives selected from the group consisting of aromatic amines and phenolic compounds. 27. A method according to claim 14, wherein the low sulphur lubricating oil comprises one or more corrosion inhibitor additives selected from the non-sulphur detergent additives. 28. A method according to claim 14, wherein the low sulphur lubricating oil comprises one or more other additives selected from one or more of anti-foam additives, Viscosity Index improvers and dispersants. 29. A method according to claim 16, wherein the low sulphur lubricating oil comprises one or more anti-wear additives selected from the group consisting of (a) molybdenum containing compounds, (b) organic based friction modifiers, and (c) salicylate-type detergents. 30. A method according to claim 16, wherein the low sulphur lubricating oil comprises one or more anti-oxidant additives selected from the group consisting of aromatic amines and phenolic compounds. 31. A method according to claim 16, wherein the low sulphur lubricating oil comprises one or more corrosion inhibitor additives selected from the non-sulphur detergent additives. 32. A method according to claim 16, wherein the low sulphur lubricating oil comprises one or more other additives selected from one or more of anti-foam additives, Viscosity Index improvers and dispersants.
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이 특허에 인용된 특허 (10)
Angevine Philip J. ; Axelrod Joan C. ; Horowitz Alan M. ; Hoskin Dennis H., Diesel fuel.
Chamberlin, III, William Bricker; Pudelski, John Kent, Low-sulfur consumable lubricating oil composition and a method of operating an internal combustion engine using the same.
Holt David Gary Lawton,GBX ; Vernon Patrick Desmond Fraser,GBX ; Atherton John Ian,GBX, Lubricant composition containing antiwear additive combination.
Beltzer Morton (Westfield NJ) Habeeb Jacob J. (Westfield NJ) Colle Karla S. (Houston TX), Lubricating oil containing an O-alkyl-N-alkoxycarbonylthionocarbamate (PNE-633).
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