Fuel Additive for Direct Injection Engine Cleanliness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current dispersants used in gasoline engines are not effective for direct fuel injected engines, leading to deposit buildup in combustion chambers and fuel systems, and existing additives may form deposits or be ineffective in fuels derived from renewable sources, necessitating a solution for maintaining engine cleanliness and performance.
Innovation Solution
A fuel composition containing a reaction product of a hydrocarbyl-substituted compound with a halogen-substituted C2 carboxylic acid, ester, amide, or salt, which does not contain detectable free or ionically bound anions, is used to reduce deposits and clean fuel injectors, improving engine performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dispersants are used in port fuel injected engines, then valve and fuel injector cleanliness is maintained, but these dispersants are ineffective for direct fuel injected engines
Solution Approach 1:
The patent modifies the chemical structure of dispersant molecules by changing parameters such as the hydrocarbon chain length (C10-C30), the type of amino group (primary, secondary, or tertiary), and the substitution pattern. These parameter changes create a new class of dispersants with enhanced properties that work effectively in both port fuel injection and direct injection engines, resolving the adaptability issue while maintaining reliability.
Solution Approach 2:
The invention creates composite dispersant molecules that combine multiple functional groups within a single molecular structure. These composite structures include hydrocarbon chains for solubility, amino groups for deposit adsorption, and polar groups for polarity adjustment. This composite approach enables the dispersant to perform multiple functions simultaneously, achieving versatility across different engine types while maintaining effective cleanliness.
2Reliability
If Mannich dispersants are used to keep fuel injectors clean, then injector cleanliness is improved, but they fail to provide suitable improvement in direct injected gasoline engines
Solution Approach 1:
The patent systematically varies key parameters of the Mannich base structure, including the hydrocarbon chain length (C10-C30), the amino group type, and the substitution pattern on the nitrogen atom. These parameter changes optimize the dispersant's ability to adsorb deposits and remain soluble in direct injection fuels, thereby improving both injector cleanliness and overall engine performance in direct injected engines.
Solution Approach 2:
The invention introduces local quality variations by creating dispersants with specific functional groups positioned at different locations within the molecular structure. The hydrocarbon chains provide local hydrophobicity for deposit interaction, while the amino groups provide local polarity for solubility. This local quality differentiation enables the dispersant to effectively clean injectors and improve engine performance simultaneously in direct injection applications.
3Reliability
If quaternary ammonium salts are used as fuel additives, then cleaning effectiveness is achieved, but they have reduced solubility in fuels and may form deposits under certain conditions
Solution Approach 1:
The patent changes the ionic character parameter of the dispersant by using non-ionic or weakly ionic structures instead of strongly ionic quaternary ammonium salts. This parameter change improves solubility in hydrocarbon-based fuels while maintaining cleaning effectiveness. The reduced ionic character prevents the formation of insoluble deposits under various fuel storage and engine operating conditions, resolving the stability issue.
Solution Approach 2:
The invention creates local quality differences within the dispersant molecule by positioning hydrophobic hydrocarbon chains and hydrophilic amino groups at different locations. This local quality differentiation allows the molecule to maintain solubility in non-polar fuels while retaining the ability to adsorb and clean polar deposit materials, thereby achieving both cleaning effectiveness and compositional stability.
4Quantity of substance
If dispersants are used to keep soot and sludge suspended, then suspension is achieved, but they are not particularly effective for cleaning surfaces once deposits have formed
Solution Approach 1:
The patent designs composite dispersant molecules that combine suspension-capable hydrocarbon chains with deposit-adsorbing amino groups in a single molecular structure. This composite structure enables the dispersant to perform both suspension and surface cleaning functions simultaneously. The hydrocarbon chains keep soot and sludge suspended in the fuel, while the amino groups actively clean deposited materials from injector surfaces, resolving the contradiction between suspension and cleaning effectiveness.
Solution Approach 2:
The invention creates a universal dispersant that performs multiple functions: suspending soot and sludge in the fuel, cleaning deposited materials from injector surfaces, and preventing new deposit formation. This multi-functionality is achieved by incorporating multiple functional groups within the dispersant molecule, each responsible for a different aspect of fuel system cleanliness, thereby eliminating the need for separate additives for suspension and cleaning.
Data Source
AI summary
A method for improving performance of fuel injectors, and a method for cleaning fuel injectors for an internal combustion engine. The methods include operating the engine on a fuel composition comprising a major amount of fuel and from about 1 to about 200 ppm by weight based on a total weight of the fuel of a reaction product of (i) a hydrocarbyl substituted compound containing at least one tertiary amino group and (ii) a halogen substituted C2-C8 carboxylic acid, ester, amide, or salt thereof, wherein the reaction product as made is substantially devoid of free anion species.