Mannich Adduct Fuel Additives for Direct Injection Engine Deposit Control
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Solution Overview
Problem
Direct-injection gasoline engines face significant deposit formation issues, particularly in the lean operating range (lambda value of 0.9 to 9), which affects fuel feed and injection behavior, and existing Mannich base additives are not effective in this range, especially in modern engines with specific cylinder geometries.
Innovation Solution
The use of amines and Mannich adducts, specifically designed to function as detergents and dispersants in fuel and lubricant compositions, comprising certain amine and Mannich adduct formulations that prevent deposit formation by incorporating polyisobutene radicals and specific molecular weight ranges, are employed to address the deposit issues in direct-injection gasoline engines operating within the lean lambda range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Mannich bases with low reactivity polyisobutene are used as fuel additives, then deposit prevention is improved in fuel-rich mixtures, but effectiveness is lost in fuel-lean mixtures (lambda 0.9 to 9)
Solution Approach 1:
The patent changes the chemical parameters of the Mannich base by using reactive polyisobutene instead of low reactivity polyisobutene, and by selecting specific amines with appropriate molecular weights. This parameter change enables the additive to remain effective across the full lambda range of 0.9 to 9, resolving the contradiction between reliability in rich mixtures and adaptability to lean mixtures
Solution Approach 2:
The patent creates a composite structure in the Mannich base by combining reactive polyisobutene radicals with specific amine components. This composite material approach allows the additive to exhibit both the deposit prevention properties needed for rich mixtures and the reactivity required for lean mixtures, simultaneously achieving reliability and adaptability
2Object-generated harmful factors
If fuel-rich mixtures (lambda 0.8) are used to prevent deposits, then deposit formation is reduced, but exhaust gas catalytic converter function is impaired and emission limits are exceeded
Solution Approach 1:
The patent introduces a specifically designed Mannich base additive as an intermediary substance that mediates between the fuel and the injection nozzle surfaces. This additive prevents deposit formation through chemical action rather than requiring fuel-rich conditions, allowing the engine to operate with lean mixtures (lambda 0.9 to 9) while still protecting against deposits, thus resolving the contradiction between reducing deposits and maintaining emission compliance
3Productivity
If lean mixtures (lambda 0.9 to 9) are used to improve fuel utilization and reduce CO2 emissions, then fuel efficiency increases, but deposit formation is intensified
Solution Approach 1:
The patent applies preliminary anti-action by incorporating the Mannich base additive into the fuel before injection. This additive proactively prevents deposit formation on injection nozzles and combustion chamber surfaces before the lean mixture operation can cause deposits. The additive creates a protective effect in advance, allowing the engine to operate efficiently with lean mixtures without suffering from the usual deposit formation problems
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
The proposed solution effectively reduces deposit formation in direct-injection gasoline engines, ensuring optimal fuel utilization and performance by using amines and Mannich adducts that function as detergents and dispersants, maintaining engine efficiency and performance even in the lean operating range.
Implementation Method 1
The use of amines and/or Mannich adducts as detergents and/or dispersants in fuel and lubricant compositions
Implementation Method 2
a component B comprising at least one Mannich adduct of the formula I where R8 is a polyisobutene radical
Data Source
AI summary
The present invention relates to the use of amines and/or Mannich adducts as detergents and/or dispersants in fuel and lubricant compositions for direct-injection gasoline engines. The invention further relates to fuel and lubricant compositions which comprise at least one such Mannich adduct, and also a bisaminoalkylated Mannich adduct.