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Lubricating Composition

a technology of lubricating composition and composition, applied in the direction of lubricant composition, mechanical equipment, machines/engines, etc., can solve the problems of preventing engine manufacturers from fully optimizing engine torque, high cylinder peak pressure, catastrophic engine failure, etc., and achieves synergistic improvement in lspi reduction and lspi reduction frequency reduction

Inactive Publication Date: 2022-05-05
INFINEUM INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a lubricating oil composition that reduces the frequency of LSPI events in direct injection-spark ignition internal combustion engines. This is achieved by using a combination of molybdenum-containing and boron-containing additives in the oil composition. The molybdenum-containing additive provides the oil composition with a molybdenum content of at least 150 ppm by weight, and the boron-containing additive provides the oil composition with a boron content of at least 150 ppm by weight. The use of this combination of additives results in a synergistic reduction of LSPI events compared to using either additive alone. The oil composition may also contain an antifoam chemical additive to reduce foam formation.

Problems solved by technology

However, higher torque at lower engine speeds has been found to cause random pre-ignition in engines at low speeds, a phenomenon known as Low Speed Pre-Ignition, or LSPI, resulting in extremely high cylinder peak pressures, which can lead to catastrophic engine failure.
The possibility of LSPI prevents engine manufacturers from fully optimizing engine torque at lower engine speed in such smaller, high-output engines.
However, alternative detergents capable of providing appropriate detergent activity and adequate total base number (TBN) can be challenging to develop.
Furthermore, increased ZDDP contents in lubricating oil formulations can lead to other, less desirable, effects.
In particular, increasing ZDDP concentration often leads to an increase in ash formation and can lead to damage of catalysts in engine exhaust systems.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0160]Two SAE OW-20 grade lubricating oil compositions representing typical European mid-SAPS passenger car motor oils were prepared. The formulation of these compositions is shown in Table 2 below.

TABLE 2Constituent TypeOil 1Oil 2Borated Dispersant 10.00570.0195(B, mass %)Mg Salicylate Detergent 20.020.02(Mg, mass %)Ca Salicylate Detergent 30.150.15(Ca, mass %)Molybdenum Compound 400.0198(Mo, mass %)Additive Package 58.0538.053(mass %)SN150 Diluent (mass %)1.821.9Pour Point Depressant60.30.3(mass %)Viscosity9.59.5Modifier7(mass %)Base Stock8(mass %)77.576SASH, mass %0.730.75P %, mass %0.0850.085S %, mass %0.20.21 The borated dispersant was a borated polyisobutenyl succinimide dispersant available from Infineum UK Limited.2 The magnesium detergent was a magnesium salicylate detergent having a total base number of 342 available from Infineum UK Limited.3 The calcium detergent was the same for each oil and comprised a mixture of a calcium salicylate detergent having a total base numbe...

example 2

[0164]Two further SAE OW-20 grade lubricating oil compositions representing typical European mid-SAPS passenger car motor oils with a phosphorous content of 0.09 mass % were prepared. The formulation of these compositions is shown in Table 4 below.

TABLE 4Constituent TypeAmountOil 3Oil 4Borated Dispersant9B, mass %0.00370.0198Ca Salicylate Detergent 10Ca, mass %0.180.18Molybdenum compound 11Mo, mass %0.00270.0330Additive package 12mass %8.2548.254APP150DIL Diluentmass %2.4852.485Pour Point Depressant13mass %0.3000.300Viscosity Modifier14mass %9.0009.000Base Stock15mass %77.37675.5869The borated dispersant was a borated polyisobutenyl succinimide dispersant available from Infineum UK Limited.10 The calcium detergent comprised a calcium salicylate detergent having a total base number of 225 available from Infineum UK Limited.11 The molybdenum dithiocarbamate is a trimeric molybdernum dithiocarbamate available from Infineum UK Limited.12 The additive package was the same for each oil an...

example 3

[0168]Five 5W-30 grade lubricating oil representing typical European mid-SAPS passenger car motor oils were prepared. The formulation of these compositions is shown in Table 6 below.

TABLE 6Constituent TypeAmountOil 5Oil 6Oil 7Oil 8Oil 9Borated Dispersant16B, mass %0.0000.0000.0400.0400.020Non-Borated Dispersant17mass %2.752.751.301.302.00Ca Sulfonate Detergent18Ca, mass %0.1510.1510.1510.1510.151MgSulfonate Detergent19Mg, mass %0.0300.0300.0300.0300.030Molybdenum Compound20Mo, mass %0.0000.0700.0000.0700.035Additive Package21mass %3.1033.1033.1033.1033.103Group II Diluentmass %1.001.001.001.001.00Pour Point Depressant22mass %0.300.300.300.300.30Viscosity Modifier23mass %8.208.208.208.208.20Base Stock34mass %balancebalancebalancebalancebalanceSASHmass %0.720.720.750.750.73P %mass %0.060.060.060.060.06S %mass %0.10.30.10.30.216The borated dispersant was a borated polyisobutenyl succinimide dispersant available from Infineum UK Limited.17The non-borated dispersant was a polyisobutylene...

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Abstract

A method of reducing low-speed pre-ignition (LSPI) in a direct-injected spark-ignited internal combustion engine comprising lubricating the crankcase of the engine with a composition comprising a combination of a molybdenum-containing additive and a boron-containing additive. Preferably, the composition comprises a calcium detergent providing a calcium content of at least 0.08 wt. %, based on the weight of the lubricating oil composition.

Description

FIELD OF THE INVENTION[0001]The present invention concerns a method of reducing low-speed pre-ignition (LSPI) events in a direct-injection spark-ignition combustion engine comprising lubricating the crankcase of the engine with a lubricating composition comprising a combination of a molybdenum-containing additive and a boron-containing additive.BACKGROUND OF THE INVENTION[0002]Market demand, as well as governmental legislation, has led automotive manufacturers to continuously improve fuel economy and reduce CO2 emissions across engine families, while simultaneously maintaining performance (horsepower). Using smaller engines providing higher power densities, increasing boost pressure, by using turbochargers or superchargers to increase specific output and down-speeding the engine by using higher transmission gear ratios allowed by higher torque generation at lower engine speeds have allowed engine manufacturers to provide excellent performance while reducing frictional and pumping lo...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M169/04C10M135/18C10M135/10C10M129/54C10M137/10C10M141/10C10M155/04C10M141/12
CPCC10M169/044C10N2010/04C10M135/10C10M129/54C10M137/10C10M141/10C10M155/04C10M141/12C10M2201/003C10M2229/00C10M2217/028C10M2219/068C10M2219/044C10M2207/144C10M2223/045C10M2223/047C10M2201/087C10M2203/1025C10M2227/061C10M2207/026C10M2201/066C10M2215/28C10M2219/046C10M2219/062C10M2215/064C10M2207/262C10M2223/065C10M2205/173C10M135/18C10M161/00F01M9/00C10N2030/06C10N2040/25C10N2010/12C10N2030/40C10N2030/42C10N2030/43C10N2030/44C10N2030/52C10N2040/255C10N2020/02C10N2060/14C10M125/26C10M125/04C10M2201/05C10N2030/04C10N2040/10
Inventor SHAW, ROBERT W.CRICK, SIMON R.FOSTER, CARINA E.
Owner INFINEUM INT LTD