Method for controlling engine deposits in a direct injection spark ignition gasoline engine

• Main Author: AHMADI MAJID R
• Format: Patent
• Language: English
• Published: 05.11.2002
• Edition: 7
• Subjects: ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; CHEMISTRY; FIRELIGHTERS; FUELS; FUELS NOT OTHERWISE PROVIDED FOR; LIQUEFIED PETROLEUM GAS; LUBRICANTS; METALLURGY; NATURAL GAS; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K; TECHNICAL GASES CONTAINING CARBON MONOXIDE

A method for controlling engine deposits in a direct injection spark ignition gasoline engine which comprises operating the engine with a fuel composition comprising a major amount of hydrocarbons boiling in the gasoline range and an effective deposit-controlling amount of a fuel additive composition comprising:(a) an aromatic ester compound of the formula:or a fuel soluble salt thereof, wherein R is hydroxy, nitro or -(CH2)x-NR5R6, wherein R5 and R6 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms and x is 0 or 1; R1 is hydrogen, hydroxy, nitro or -NR7R8, wherein R7 and R8 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms; R2 and R3 are independently hydrogen or lower alkyl having 1 to 6 carbon atoms; and R4 is a polyalkyl group having an average molecular weight in the range of about 450 to 5,000; and(b) a poly(oxyalkylene) amine having at least one basic nitrogen atom and a sufficient number of oxyalkylene units to render the poly(oxyalkylene) amine soluble in hydrocarbons boiling in the gasoline range.