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Lubricating compositions

a technology of compositions and lubricating oils, applied in the direction of engine lubrication, additives, mechanical equipment, 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 reduction of frequency of lspi events

Inactive Publication Date: 2019-03-28
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 combining boron-containing and molybdenum-containing additives in the oil composition. The combination of these additives acts synergistically to improve LSPI reduction compared to using either additive alone. The oil composition should have a molybdenum content of at least 150 ppm by weight and a boron content of at least 150 ppm by weight. The oil composition should also include an anti-foam chemical additive to prevent the formation of foam.

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
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Effect test

example 1

[0161]Two SAE 0W-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

[0165]Two further SAE 0W-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

[0169]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 6ConstituentTypeAmountOil 5Oil 6Oil 7Oil 8Oil 9BoratedB, mass %0.0000.0000.0400.0400.020Dispersant16Non-Boratedmass %2.752.751.301.302.00Dispersant17Ca SulfonateCa,0.1510.1510.1510.1510.151Detergent18mass %MgSulfonateMg,0.0300.0300.0300.0300.030Detergent19mass %MolybdenumMo,0.0000.0700.0000.0700.035Compound20mass %Additivemass %3.1033.1033.1033.1033.103Package21Group IImass %1.001.001.001.001.00DiluentPour Pointmass %0.300.300.300.300.30Depressant22Viscositymass %8.208.208.208.208.20Modifier23Base Stock24mass %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 succinimide ...

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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

[0001]FIELD OF THE INVENTION[0002]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[0003]Market demand, as well as governmental legislation, has fed 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 pump...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10M155/04C10M135/18C10M135/10C10M129/54C10M137/10C10M141/10
CPCC10M169/044C10M155/04C10M135/18C10M135/10C10M129/54C10M137/10C10M141/10C10M2201/003C10M2229/00C10M2217/028C10M2219/068C10M2219/044C10M2207/144C10M2223/045C10N2230/04C10N2240/108C10M161/00F01M9/00C10M2227/061C10N2030/06C10N2040/25C10N2010/12C10M141/12C10M2201/066C10M2201/087C10M2203/1025C10M2205/173C10M2207/026C10M2207/262C10M2215/064C10M2215/28C10M2219/046C10M2219/062C10M2223/047C10M2223/065C10N2030/40C10N2030/42C10N2030/43C10N2030/44C10N2030/52C10N2040/255C10N2010/04C10N2020/02C10N2060/14C10M125/26C10M125/04C10M2201/05C10N2030/04C10N2040/10
Inventor SHAW, ROBERT W.CRICK, SIMONFOSTER, CARINA
Owner INFINEUM INT LTD