Method for controlling deposit formation in gasoline direct injection engine by use of a fuel having particular compositional characteristics
AssigneeExxonMobil Research and Engineering Company
InventorsNoyes L. Avery, Paul Patrick Wells
Life of this patent
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Abstract
The formation of deposits on the injectors of gasoline direct injection engines controlled by combustion in said engine of a fuel comprising a gasoline containing about 12 to 65 vol % aromatics when the aromatics present in the fuel are attributable to the presence in the fuel of light fluid cat cracker stream product, reformate or a mixture thereof, preferably predominantly reformate.
Claims9
A method for controlling the formation of injector deposits in a gasoline direct injection internal combustion engine by combusting in said engine a fuel comprising gasoline containing from about 12 to about 65 vol % aromatics wherein the source of the aromatics is selected from the group consisting of reformate, a fluid cat cracker stream and mixtures of reformate and a fluid cat cracker stream, wherein with respect to the fluid cat cracker stream a light fluid cat cracker stream fraction in an amount of from about 70% to 100% constitutes the fluid cat cracker stream, and wherein the light fluid cat cracker stream is characterized as having an initial boiling point in the range of about 32° C. to 38° C., a T10 in the range of about 54° C. to 66° C., a T90 in the range of about 138° C. to 149° C., and a final boiling point in the range of about 166° C. to 177° C.
In a method for controlling the formation of injector tip deposits in a gasoline direct injection internal combustion engine by combusting in the engine a fuel comprising gasoline characterized by having a T90 in the range of about 150 to 182° C., an olefins content in the range of about 3.6 to 20 vol %, a sulfur content in the range of about 5 to 400 ppm and an aromatics content in the range of about 10-45 vol %, the improvement comprising using as the source of aromatics a stream selected from the group consisting of reformate, a fluid cat cracker stream and mixtures of reformate and a fluid cat cracker stream, wherein with respect to the fluid cat cracker stream a light fluid cat cracker stream fraction in an amount of from about 70 to 100% constitutes the fluid cat cracker stream, wherein the light fluid cat cracker stream is characterized as having an initial boiling point in the range of about 32° C. to 38° C., a T10 in the range of about 54° C. to 66° C., a T90 in the range of about 138° C. to 149° C., and a final boiling point in the range of about 166° C. to 177° C.
Dependencies are inferred from the claim text.