Method for preventing or reducing low speed pre-ignition in direct injected spark-ignited engines with manganesemanganese-containing lubricant

Patent metadata

Field	Value
Publication number	US-10844307-B2
Application number	US-201916408690-A
Country	US
Kind code	B2
Filing date	May 10, 2019
Priority date	May 25, 2018
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

Disclosed is a lubricating engine oil composition for a direct injected, boosted, spark ignited internal combustion engine comprising from about 25 to about 3000 ppm of metal from at least one manganese-containing compound, based on the total weight of the lubricating oil. Also disclosed is a method for preventing or reducing low speed pre-ignition in an engine lubricated with said lubricating engine oil composition.

First claim

What is claimed is:

1. A method for preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising from about 25 to about 3000 ppm of metal from at least one manganese-containing compound, based on the total weight of the lubricating oil composition, wherein the at least one manganese-containing compound has the following formula:

wherein α is +2 or +3 oxidation state, R D is a branched, saturated hydrocarbon moiety having from 1 to about 30 carbon atoms, n is an integer from 0 to 3, L is absent or a ligand that saturates the coordination sphere of manganese, and x is an integer from 0 to 6.

2. The method of claim 1 , wherein the engine is operated under a load with a break mean effective pressure (BMEP) of from about 12 to about 30 bars.

3. The method of claim 1 , wherein the engine is operated at speeds between 500 and 3,000 rpm.

4. The method of claim 1 , wherein the lubricating oil further comprises a detergent selected from calcium detergents, magnesium detergents, sodium detergents, lithium detergents, and potassium detergents.

5. The method of claim 4 , wherein the detergent is a carboxylate, salicylate, phenate, or sulfonate detergent.

6. The method of claim 1 , wherein the lubricating oil further comprises a molybdenum containing compound.

7. The method of claim 1 , wherein the lubricant composition further comprises at least one other additive selected from an ashless dispersant, an ashless antioxidant, a phosphorus-containing anti-wear additive, a friction modifier, and a polymeric viscosity modifier.

8. The method of claim 1 , wherein the engine is fueled with a liquid hydrocarbon fuel, a liquid nonhydrocarbon fuel, or mixtures thereof.

9. The method of claim 1 , wherein the engine is fueled by natural gas, liquefied petroleum gas (LPG), compressed natural gas (CNG), or mixtures thereof.

10. A lubricating engine oil composition for use in a down-sized boosted engine comprising a lubricating oil base stock as a major component; and at least one manganese-containing compound, as a minor component; wherein the at least one manganese-containing compound has the following formula:

wherein α is +2 or +3 oxidation state, R D is a branched, saturated hydrocarbon moiety having from 1 to about 30 carbon atoms, n is an integer from 0 to 3, L is absent or a ligand that saturates the coordination sphere of manganese, and x is an integer from 0 to 6; and wherein the downsized engine ranges from 0.5 liters to 3.6 liters.

Assignees

• Chevron Oronite Co
• Chevron Usa Inc

Inventors

• Elliott Ian G
• Maria Amir Gamal
• Cherpeck Richard Eugene
• Gunawan Theresa Liang
• Thomas Andrew M

Classifications

• C10N2010/14

  Group 7 · CPC title

• F02B75/02

  Engines characterised by their cycles, e.g. six-stroke · CPC title

• F02B19/12

  with positive ignition (engines with non-timed positive ignition, and with incandescent chambers F02B9/08) · CPC title

• C10N2060/14

  by boron or a compound containing boron · CPC title

• C10N2040/255

  Gasoline engines · CPC title