Composition and method for preventing or reducing engine knock and pre-ignition in high compression spark ignition engines

Patent metadata

Field	Value
Publication number	US-10829708-B2
Application number	US-201715837340-A
Country	US
Kind code	B2
Filing date	Dec 11, 2017
Priority date	Dec 19, 2016
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine with relatively high oil consumption, lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition that contains a lubricating oil base stock comprising at least one ester including at least one group selected from the group consisting of Formula (1), Formula (2), Formula (3) and Formula (4) below or at least one ester having at least 25% of its carbons in the form of methyl groups:

The lubricating oils of this disclosure are useful as passenger vehicle engine oil (PVEO) products.

First claim

The invention claimed is:

1. A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine, comprising:
introducing a formulated oil to the engine, said formulated oil having a composition comprising a lubricating oil base stock comprising: (a) at least one ester including at least one group selected from the group consisting of: Formula (1), Formula (2), Formula (3) and Formula (4) below; or (b) at least one ester having at least 25% of its carbons in the form of methyl groups:

 and
operating the engine at an oil consumption rate greater than 50 grams per hour.

2. The method of claim 1 wherein the at least one ester is a polyol ester.

3. The method of claim 1 wherein the at least one ester is a monoester or dibasic ester.

4. The method of claim 1 wherein the at least one ester has at least 33% of its carbons in the form of methyl groups.

5. The method of claim 1 wherein the formulated oil is an ashless formulated oil.

6. The method of claim 1 wherein the formulated oil further includes at least one ashless antiwear additive selected from the group consisting of an amine phosphate, a thiophosphate, a dithiophosphate, an amine salt of sulfurized phosphate, an alkylated triphenylphosphorothionate, and mixtures thereof.

7. The method of claim 1 wherein the formulated oil further comprises an aminic antioxidant.

8. The method of claim 1 wherein the formulated oil further comprises a polymeric or oligomeric aminic antioxidant.

9. The method of claim 6 wherein the at least one ester is present in an amount of from 1 to 99.8 weight percent, based on the total weight of the formulated oil, and the at least one ashless antiwear additive is present in an amount from 0.1 to 4 weight percent, based on the total weight of the formulated oil.

10. The method of claim 1 wherein the lubricating oil further comprises one or more of a detergent, dispersant, viscosity index improver, antioxidant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, anti-rust additive, or friction modifier.

11. The method of claim 10 wherein the detergent is an ashless nonionic detergent.

12. The method of claim 1 wherein the ignition engine has a compression ratio of at least 12.

13. The method of claim 1 wherein the ignition engine is a super-charged engine or a turbo-charged engine.

14. The method of claim 1 wherein the pre-ignition is low speed pre-ignition (LSPI).

15. The method of claim 2 wherein the polyol ester is derived from at least one polyhydric alcohol and at least one branched mono-carboxylic acid.

16. The method of claim 15 wherein the polyhydric alcohol is selected from the group consisting of neopentyl glycol, 2,2-dimethylol butane, trimethylol ethane, trimethylol propane, trimethylol butane, mono-pentaerythritol, di-pentaerythritol, tri-pentaerythritol, ethylene glycol, propylene glycol and polyalkylene glycols, and mixtures thereof.

17. A lubricating engine oil for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine, comprising:
0.05 wt % to 0.6 wt % calcium; and
a lubricating oil base stock comprising: (a) at least one ester including at least one group selected from the group consisting of: Formula (1), Formula (2), Formula (3), and Formula (4) below; or (b) at least one ester having at least 25% of its carbons in the form of methyl groups:

18. The lubricating engine oil of claim 17 wherein the lubricating engine oil is ashless lubricating engine oil.

19. The lubricating engine oil of claim 17 wherein the at least one ester is a polyol ester.

20. The lubricating engine oil of claim 17 wherein the at least one ester is a monoester or dibasic ester.

21. The lubricating engine oil of claim 15 wherein the at least one ester has at least 33% of its carbons in the form of methyl groups.

22. The lubricating engine oil of claim 17 further including at least one ashless antiwear additive selected from the group consisting of an amine phosphate, a thiophosphate, a dithiophosphate, an amine salt of sulfurized phosphate, an alkylated triphenylphosphorothionate, and mixtures thereof.

23. The lubricating engine oil of claim 17 further comprising an aminic antioxidant.

24. The lubricating engine oil of claim 17 further comprising a polymeric or oligomeric aminic antioxidant.

25. The lubricating engine oil of claim 22 wherein the at least one ester is present in an amount of from 1 to 99.8 weight percent, based on the total weight of the oil, and the at least one ashless antiwear additive is present in an amount from 0.1 to 4 weight percent, based on the total weight of the oil.

26. The lubricating engine oil of claim 17 which further comprises one or more of a detergent, dispersant, viscosity index improver, antioxidant, pour point depressant, corrosion inhibitor, metal deactivator, seal compatibility additive, anti-foam agent, inhibitor, anti-rust additive, and friction modifier.

27. The lubricating engine oil of claim 26 wherein the detergent is an ashless nonionic detergent.

28. The lubricating engine oil of claim 17 wherein the engine has a compression ratio of at least 12.

29. The lubricating engine oil of claim 17 wherein the engine is a super-charged engine or a turbo-charged engine.

30. The lubricating engine oil of claim 17 wherein the engine has an oil consumption greater than 50 grams per hour.

31. The lubricating engine oil of claim 17 wherein the pre-ignition is low speed pre-ignition (LSPI).

32. The lubricating engine oil of claim 19 wherein the polyol ester is derived from at least one polyhydric alcohol and at least one branched mono-carboxylic acid.

33. The lubricating engine oil of claim 32 wherein the polyhydric alcohol is selected from the group consisting of neopentyl glycol, 2,2-dimethylol butane, trimethylol ethane, trimethylol propane, trimethylol butane, mono-pentaerythritol, pentaerythritol, di-pentaerythritol, tri-pentaerythritol, ethylene glycol, propylene glycol and polyalkylene glycols, and mixtures thereof.

34. A high compression spark ignition engine lubricated with the lubricating engine oil of claim 17 .

35. A method of making a lubricating engine oil for high compression spark ignition engines with relatively high oil consumption, said method comprising:
blending a lubricating oil base stock comprising:
(i) at least one ester including at least one group selected from the group consisting of Formula (1), Formula (2), Formula (3) and Formula (4) below:

or (ii) at least one ester having at least 25% of its carbon in the form of methyl group and
(iii) at least one ashless antiwear additive selected from the group consisting of a phosphorus-containing ashless antiwear additive, a sulfur-containing ashless antiwear additive, and a phosphorus/sulfur-containing ashless antiwear additive to form the lubri

Assignees

• Exxonmobil Res & Eng Co

Inventors

• Gao Zhisheng
• Choi Eugine
• Salvi Luca
• Boland Matthew W

Classifications

• C10M105/36 Primary

  of polycarboxylic acids · CPC title

• C10N2020/071

  Branched chain compounds · CPC title

• C10N2030/45

  Ash-less or low ash content · CPC title

• C10M2215/065

  Phenyl-Naphthyl amines · CPC title

• C10N2030/12

  Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives · CPC title