Ester Additive Control of Injector Deposits in Diesel Fuel
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Solution Overview
Problem
Modern diesel engines with high-pressure fuel systems face issues with injector fouling and internal diesel injector deposits (IDIDs), leading to power loss, reduced fuel economy, and potential engine failure due to the formation of carbonaceous and lacquer-like residues, which conventional detergents fail to effectively control.
Innovation Solution
The use of ester compounds derived from polycarboxylic acids and polyhydric alcohols as detergent additives in diesel fuel, specifically reacting polycarboxylic acids or anhydrides with compounds like polyisobutenyl succinic acid, to form effective detergents that prevent and remove deposits in high-pressure fuel systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional detergents are used in diesel fuel, then injector deposits are controlled to some extent, but deposits still form leading to power loss and reduced fuel economy
Solution Approach 1:
The patent changes the chemical parameters of the detergent additive by using ester compounds with specific molecular weight ranges (500-2000) and specific functional groups, improving deposit control effectiveness compared to conventional detergents
Solution Approach 2:
The patent employs composite ester compounds formed by combining polycarboxylic acids with specific alcohol structures, creating a multi-functional detergent that addresses both external and internal injector deposits more effectively than single-component conventional detergents
2Power
If high injection pressures are used to achieve better fuel atomisation and combustion, then engine performance and emissions are improved, but fuel degradation and deposit formation increase
Solution Approach 1:
The patent applies detergent additives to the fuel before injection, preparing the fuel system in advance by preventing deposit formation on injector surfaces before they can interfere with the high-pressure injection process
Solution Approach 2:
The ester detergent compounds act as intermediary substances between the fuel and the injector system, modifying fuel properties to reduce degradation while maintaining the benefits of high-pressure injection
3Productivity
If injector nozzle hole diameters are reduced to improve fuel atomisation, then combustion efficiency is improved, but deposit build-up has a more significant relative impact
Solution Approach 1:
The patent changes the physical parameters of the detergent molecules to optimize their ability to prevent deposit formation in narrow nozzle passages, using specific molecular weight and structural characteristics that allow effective deposit control in small orifices
4Manufacturing precision
If internal diesel injector deposits form on critical moving parts, then injector timing and quantity control are affected, but the problem is difficult to detect and measure
Solution Approach 1:
The detergent additive provides self-service protection by continuously cleaning and preventing deposit formation on internal injector surfaces during normal fuel injection operation, maintaining precision without requiring external intervention or complex monitoring systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These ester additives significantly reduce or prevent the formation of external and internal injector deposits, improving engine performance by maintaining fuel flow and combustion efficiency, and extending maintenance intervals by effectively controlling IDIDs and fuel filter deposits.
Implementation Method 1
The ester compound functions as a detergent
Implementation Method 2
The ester compound functions as a detergent
Data Source
AI summary
A diesel fuel composition comprising as an additive an ester compound which is the reaction product of an optionally substituted polycarboxylic acid or an anhydride thereof and a compound or formula H-(OR)n-OR1, wherein R is an optionally substituted alkylene group, R1 is an optionally substituted hydrocarbyl group and n is at least 1.