Lubricants with titanium and/or tungsten and their use for improving low speed pre-ignition

A low-speed, lubricating oil composition technology, applied in the direction of engine lubrication, lubricating composition, additives, etc., can solve problems such as increased LSPI incidents

Active Publication Date: 2018-03-20
AFTON CHEMICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Several published studies have demonstrated that turbocharger use, engine design, engine coating, piston shape, fuel choice, and / or oil additives may contribute to increased LSPI incidents

Method used

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  • Lubricants with titanium and/or tungsten and their use for improving low speed pre-ignition
  • Lubricants with titanium and/or tungsten and their use for improving low speed pre-ignition
  • Lubricants with titanium and/or tungsten and their use for improving low speed pre-ignition

Examples

Experimental program
Comparison scheme
Effect test

example

[0231] Fully formulated lubricating oil compositions containing conventional additives were prepared and the low rate preignition events of the lubricating oil compositions were measured. Each lubricating oil composition contained a major amount of base oil, a conventional base DI package, and a viscosity index improver, wherein the base DI package (lacking the viscosity index improver) comprised about 8 to 12% by weight of the lubricating oil composition. Base DI contained conventional amounts of dispersants, antiwear additives, defoamers and antioxidants, as shown in Table 3 below. Specifically, the base DI comprises a succinimide dispersant, a borated succinimide dispersant, a molybdenum-containing compound in an amount providing about 80 ppm molybdenum to the lubricating oil composition, an organic friction modifier, one or Various antioxidants and one or more antiwear agents (unless otherwise specified). The base DI package is also blended with about 5 to about 10 wt. % ...

example 1

[0247] The effect of varying amounts of titanium incorporation into lubricating oil compositions on the LSPI ratio was tested. A base formulation was used to test the combination of an overbased calcium-containing detergent ("OB") with a titanium-containing compound. Formulation R-1, as described above, contained as the sole detergent an overbased calcium-containing detergent in an amount to provide about 2400 ppmw Ca to the lubricating oil composition. Formulation R-2 contained slightly more calcium, and 100 ppm titanium.

[0248] Comparative formulation C-1 contained, as the sole detergent, an overbased calcium-containing detergent in an amount to provide about 1600 ppmw Ca to the lubricating oil composition. Comparative formulation C-2 contained an amount of overbased calcium-containing detergent to provide 2400 ppmw Ca to the lubricating oil composition. Formulation C-2 also contained the reaction product of titanium isopropoxide and neodecanoic acid in an amount to prov...

example 2

[0256] In this example the effect of including different sources of titanium in lubricating oil compositions was determined. Formulations R-1 and C-1 as described above in Example 1 were used for comparison purposes. In addition, Inventive Example I-2 is also the same as Example 1 in this Example 2. In each of the experimental compositions of Examples 2, 1-2, 1-5, and 1-6, the level of overbased calcium-containing detergent provided approximately 1575 ppmw Ca to the various lubricating oil compositions. Formulation 1-2 used the reaction product of titanium isopropoxide and neodecanoic acid as the titanium source. Formulation 1-5 used titanium isopropoxide as the titanium source. In formulation 1-6, a titanium-containing dispersant was used as the titanium source. The results are shown in Table 5.

[0257] table 5

[0258]

[0259] As shown in Table 5, each of the different titanium sources used in the lubricating oil compositions was effective in reducing the ...

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Abstract

A lubricating oil composition and method of operating a boosted internal combustion engine. The lubricating oil composition includes a major amount of a base oil, one or more overbased calcium-containing detergents having a total base number of greater than (225) mg KOH/gram, to provide greater than (900) ppm by weight to less than (2400) ppm by weight of calcium to the lubricating oil composition, and a low speed pre-ignition reducing amount of one or more titanium-containing compounds to provide from (10) ppm to (3000) ppm titanium and/or one or more tungsten-containing compounds to providefrom (125) ppm to (3000) ppm tungsten, all based on the total weight of the lubricating composition. The low speed pre-ignition events in the boosted internal combustion engine may be reduced relativeto a number of low speed pre-ignition events in the same engine lubricated with the same lubricating oil without the titanium- and/or tungsten-containing additive.

Description

technical field [0001] The present invention relates to lubricant compositions containing one or more oil-soluble titanium-containing and / or tungsten-containing additives and methods of reducing low velocity pre-ignition events using such lubricating oil compositions. Background technique [0002] Turbocharged or supercharged engines (ie, supercharged internal combustion engines) can exhibit an abnormal combustion phenomenon known as stochastic pre-ignition or low-speed pre-ignition (or "LSPI"). LSPI is a pre-ignition event that can include very high pressure spikes, pre-ignition occurring during improper crankshaft angles, and knocking. All of these, individually and in combination, have the potential to cause engine degradation and / or severe damage. However, because LSPI events only occur occasionally in an uncontrollable manner, it is difficult to identify the cause of this phenomenon and to develop solutions to contain it. [0003] Pre-ignition is a form of combustion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M163/00
CPCC10M163/00C10M2203/1025C10M2203/1006C10M2205/0285C10M2207/126C10M2207/021C10M2215/04C10M2219/046C10N2010/08C10N2010/12C10N2030/00C10N2030/08C10N2030/10C10N2030/45C10N2030/52C10N2010/04C10N2040/25C10N2040/255C10M2215/06C10M127/00C10M129/50C10M135/10F01M9/02C10M129/26C10M159/20C10M169/04C10M129/02C10M2203/00C10M2207/00C10M2207/141
Inventor 克里斯汀·弗莱彻威廉·Y·拉姆杨孔盛杰瑞米·斯泰尔
Owner AFTON CHEMICAL
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