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Lubricating compositions for preventing or reducing pre-ignition in an engine

a technology of lubricating compositions and engine, applied in the direction of lubricant compositions, additives, petroleum industry, etc., can solve the problems of significant negative impact on engine efficiency and overall performance, pre-ignition phenomenon, sharp increase in temperatures and pressures, etc., to prevent or reduce pre-ignition, prevent or reduce low-speed pre-ignition

Inactive Publication Date: 2018-08-16
TOTAL MARKETING SERVICES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a lubricating composition that prevents or reduces pre-ignition in engines, without needing other solutions that may reduce calcium or magnesium content or increase volatility. The composition is easy to formulate and can be used in vehicle engines to prevent low speed pre-ignition. In summary, the patent provides a solution for preventing pre-ignition in engines through a lubricating composition.

Problems solved by technology

However, in some cases, the air / fuel mixture may be prematurely ignited by an ignition source prior to ignition by the spark of the spark plug, resulting in a phenomenon known as pre-ignition.
It is preferable to reduce or even eliminate pre-ignition, as this generally results in the presence of a sharp increase in temperatures and pressures in the combustion chamber, and may thus lead to a significant negative impact on the efficiency and the overall performance of an engine.
In addition, pre-ignition may cause significant damage to the cylinders, pistons, spark plugs and valves in the engine and in some cases may even lead to engine failure or even engine damage.
Recently, Low Speed Pre-Ignition (LSPI) has been identified, particularly by car manufacturers, as a potential problem for small engines (or downsized engines).
LSPI typically occurs at low speeds and high loads, and may cause serious damage to pistons and / or cylinders.
However, these solutions remain still insufficient to significantly reduce pre-ignition and are difficult to implement, especially in countries where a high level of basicity is required in fuels.
In addition, problems of lubricant stability or compatibility with post-treatment systems are associated with these solutions.
However, these light organic compounds could cause an excessive increase in lubricant volatility.

Method used

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  • Lubricating compositions for preventing or reducing pre-ignition in an engine
  • Lubricating compositions for preventing or reducing pre-ignition in an engine
  • Lubricating compositions for preventing or reducing pre-ignition in an engine

Examples

Experimental program
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Effect test

example 1 preparation

of Lubricating Compositions According to the Invention

[0206]The various components of the lubricating compositions according to the invention CI1 and CI2 are mixed according to the nature and the quantities presented in Table 1.

TABLE 1CI1CI2Gr III base oil85.0184.77Viscosity Index Improver5.005.00(Polyisobutene StyreneHydrogenated or PISH)Anti-wear (DTPZn)0.630.80Antioxidant amine0.800.80(Diphenylamine)Detergent (Calcium sulphonate)2.002.00Dispersant (Bis-Succinimide)6.006.00Mo-DTP (Sakuralube 300)0.56Sulfur-Free Molybdenum0.63Complex (Molyvan 855)KV 100 (measured in mm2 / s8.38.3according to ASTM D445)

example 2

on of Comparative Lubricating Compositions

[0207]The various components of the comparative lubricating composition CC1 are mixed according to the nature and amounts shown in Table 2

TABLE 2CC1Gr III base oil84.90Viscosity Index Improver5.00(Polyisobutene StyreneHydrogenated or PISH)Anti-wear (DTPZn)0.80Antioxidant amine0.80(Diphenylamine)Detergent (Calcium sulphonate)2.00Dispersant (Bis-succinimide)6.00Mo-DTC (Sakuralube 525)0.50KV 100 (measured in mm2 / s8.3according to ASTM D445)

example 3

Evaluation of the Pre-Ignition Reduction Properties of the Lubricating Compositions According to the Invention CI1 and CI2 and of the Comparative Lubricating Composition CC1

[0208]This evaluation is performed by evaluating the impact of each lubricating composition on the low-speed pre-ignition (LSPI).

[0209]For this, the LSPI phenomenon is quantified by means of a GM Ecotech model spark ignition turbocharged engine composed of 4 cylinders in line for a total displacement of 2.0 L.

[0210]After a heating period of 20 minutes at an engine speed of 2000 rpm and an engine load of 4.105 Pascal effective average pressure (EAP), the test procedure consists of 2 sequences under heavy load (23.105 Pascal EAP at a speed of 2.000 rpm), 2 sequences under low load (13.105 Pascal of EAP at a speed of 1.250 rpm) and 2 sequences under heavy load identical to the first 2. Each sequence comprises 25.000 motor cycles to ensure a good statistical representativeness of the phenomenon studied.

[0211]Each cyl...

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Abstract

Disclosed is a method using a lubricating composition including at least one base oil and at least one organomolybdenum compound chosen from among molybdenum dithiophosphate compounds for preventing or reducing pre-ignition in an engine, preferably in a motor vehicle.

Description

[0001]The invention relates to the use of a lubricating composition for preventing or reducing pre-ignition in an engine. More particularly, the invention relates to the use of a lubricating composition comprising at least one base oil and at least one organomolybdenum compound for preventing or reducing pre-ignition in an engine, preferably in a vehicle engine, in particular of a motor vehicle.[0002]The present invention also relates to a method for preventing or reducing pre-ignition in an engine, preferably in a vehicle engine, especially of a motor vehicle, implementing this lubricating composition.[0003]The present invention also relates to the use of an organomolybdenum compound in a lubricating composition for preventing or reducing pre-ignition in an engine, preferably in a vehicle engine, especially of automobiles.TECHNOLOGICAL BACKGROUND[0004]Under ideal conditions, normal combustion in a spark-ignition engine occurs when a mixture of fuel, and in particular fuel and air, ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M137/10
CPCC10M137/10C10M2203/1006C10M2223/045C10N2240/104C10M159/18C10M2203/024C10M2203/1025C10M2205/026C10M2205/04C10M2215/064C10M2215/28C10M2219/046C10M2227/066C10M139/00C10N2010/12C10N2030/02C10N2040/255C10N2010/04C10N2020/02C10N2060/02C10M2205/06
Inventor OBRECHT, NICOLAS
Owner TOTAL MARKETING SERVICES SA
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