| 摘要 |
PROBLEM TO BE SOLVED: To provide methods and compositions that provide detergency.SOLUTION: The present invention relates to methods of fueling an internal combustion engine, and compositions, which provide improved nitrogen-free detergency in the engine, particularly in the area of injector deposit control. The present invention also provides methods of providing both improved detergency and improved corrosion inhibition, while avoiding compatibility problems with fuels and/or while limiting the amount of nitrogen delivered to the fuels from a deposit control additive. A method of providing improved detergency in a fuel system of an internal-combustion engine comprises the steps of: (i) adding to a fuel composition a nitrogen-free additive comprising a substituted hydrocarbon with at least two carboxy functionalities in the form of acids or at least one carboxy functionality in the form an anhydride; and (ii) supplying the fuel composition to the internal combustion engine.SELECTED DRAWING: None |
