Lubricant oil compositions to optimize internal combustion engine performance
AssigneeSouthwest Research Institute
InventorsManfred Amann, Terrence Francis Alger, II, Thomas W. Ryan, III
Life of this patent
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Abstract
The present disclosure relates to lubricant oil compositions formed from base stock oils to optimize internal combustion engine performance. Base stock oils are identified that have selected cetane number characteristics and relatively reduced reactivity to improve their associated combustion characteristics and reduce engine knock without the need to modify the engine fuel or engine parameters such as compression ratio and/or ignition timing. The base stocks may specifically include esters of dicarboxylic acids, esters of trimellitic anhydride and/or alklyated naphthalene compounds.
Claims24
A process for providing a reduced reactivity lubricant for reducing engine knock in an internal combustion engine cylinder comprising:
- providing a base stock oil having an IQT[Cetane Number](−100%)(Base Stock oil);
- said base stock oil formulated for use as a lubricant for an internal combustion engine utilizing a selected fuel having a fuel cetane number wherein
- IQT[Cetane Number](−100%)(Basestock Oil)≦Fuel Cetane Number;
- and
- wherein said fuel cetane number is an extrapolated fuel cetane number and is provided by an ignition quality tester (IQT) where the fuel is injected into a constant volume combustion chamber along with a solvent having a viscosity of less than or equal to 1.0 cP at 25° C. and the ignition delay is determined as the time difference between the start of injection and the start of combustion for different concentrations of solvent to provide cetane numbers, wherein said fuel cetane number is determined by linear curve fitting of a plot of said cetane numbers versus concentration of said low viscosity solvent excluding the 100% solvent condition.
A process for providing a reduced reactivity lubricant for reducing engine knock in an internal combustion engine cylinder comprising:
- providing a base stock oil having an IQT[Cetane Number[(−100%)(Base Stock Oil)wherein said base stock oil comprises one or more of the following:
- (a) esters of dicarboxylic acids;
- (b) esters of trimellitic anhydride;
- (c) alklyated naphthalene;
- said base stock oil formulated for use as a lubricant for an internal combustion engine utilizing a selected fuel having a fuel cetane number wherein
- IQT[Cetane Number](−100%)(Basestock Oil)≦Fuel Cetane Number;
- and
- wherein said fuel cetane number is an extrapolated fuel cetane number and is provided by an ignition quality tester (IQT) where the fuel is injected into a constant volume combustion chamber along with a solvent having a viscosity of less than or equal to 1.0 cP at 25° C. and the ignition delay is determined as the time difference between the start of injection and the start of combustion for different concentrations of solvent to provide cetane numbers, wherein said fuel cetane number is determined by linear curve fitting of a plot of said cetane numbers versus concentration of said low viscosity solvent excluding the 100% solvent condition.
A process for identifying a lubricant for reducing engine knock in an internal combustion engine cylinder comprising:
- providing a base stock oil having an IQT[Cetane Number](−100%)(Base Stock Oil);
- said base stock oil formulated for use as a lubricant for an internal combustion engine utilizing a selected fuel having a fuel cetane number wherein
- IQT[Cetane Number](−100%)(Basestock Oil)≦Fuel Cetane Number;
- and
- said IQT[Cetane Number](−100%)(Base Stock Oil) comprises an extrapolated cetane number and is provided by an ignition quality tester (IQT) where the base stock oil is injected into a constant volume combustion chamber along with a solvent having a viscosity of less than or equal to 1.0 cP at 25° C. and the ignition delay is determined as the time difference between the start of injection and the start of combustion for different concentrations of solvent to provide cetane numbers, wherein said base stock oil cetane number is determined by linear curve fitting of a plot of said cetane numbers versus concentration of said low viscosity solvent excluding the 100% solvent condition;
- and
- said fuel cetane number is an extrapolated fuel cetane number and is provided by an ignition quality tester (IQT) where the fuel is injected into a constant volume combustion chamber along with a solvent having a viscosity of less than or equal to 1.0 cP at 25° C. and the ignition delay is determined as the time difference between the start of injection and the start of combustion for different concentrations of solvent to provide cetane numbers, wherein said fuel cetane number is determined by linear curve fitting of a plot of said cetane numbers versus concentration of said low viscosity solvent excluding the 100% solvent condition.
Dependencies are inferred from the claim text.