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US 11,214,756 B2Granted
Lubricant compositions for direct injection engine
AssigneeThe Lubrizol Corporation
InventorsPatrick E. Mosier, Jeffry G. Dietz, Alexander Sammut, Mary Galic Raguz, Matthew D. Gieselman
Life of this patent
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Abstract
The invention is directed to a method for reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine by supplying to the sump a lubricant composition which contains an oil of lubricating viscosity and an ashless dispersant. The ashless dispersant may be selected from succinimide compounds prepared from aliphatic or aromatic amines.
Claims8
A lubricant composition comprising:
- a base oil of lubricating viscosity;
- 0.5 to 2.2 wt % of a boron-containing polyisobutenyl succinimide ashless dispersant having a TBN of 30 to 70 and delivering 80 to 350 ppm of boron to the lubricating composition;
- 1.0 to 3.0 wt % of a boron-free polyisobutenyl succinimide dispersant having a TBN of 30 to 70;
- 0.2 to 0.5 wt % of a sulfurized olefin antioxidant;
- 0.2 to 1 wt % of a magnesium sulfonate detergent having a TBN of 300 to 500;
- 0.4 to 1.1 wt % of a zinc dialkyldithiophosphate antiwear agent;
- and
- 0.2 to 3 wt % of a calcium alkylbenzene sulfonate detergent.
5 more elements
A lubricant composition comprising:
- a base oil of lubricating viscosity;
- 0.5 to 2.2 wt % of a boron-containing polyisobutenyl succinimide ashless dispersant having a TBN of 30 to 70 and delivering 80 to 350 ppm of boron to the lubricating composition;
- 1.0 to 3.0 wt % of a boron-free polyisobutenyl succinimide dispersant having a TBN of 30 to 70;
- 0.2 to 0.5 wt % of a sulfurized olefin antioxidant;
- 0.2 to 1 wt % of a magnesium sulfonate detergent having a TBN of 300 to 500;
- 0.4 to 1.1 wt % of a zinc dialkyldithiophosphate antiwear agent;
- and
- 0.2 to 3 wt % of a calcium alkylbenzene sulfonate detergent, wherein the lubricating composition is capable of reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine operated under a load with a brake mean effective pressure (BMEP) of greater than or equal to 10 bars.
5 more elements
Dependencies are inferred from the claim text.