Three-Additive Fuel Composition for Deposits and Valve Sticking
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Solution Overview
Problem
Existing fuel additives for spark-ignition engines are inadequate in preventing all types of deposits, including valve sticking, and do not effectively address the challenges posed by new gasoline direct injection systems, which experience increased deposit formation due to severe pressure and temperature conditions, leading to combustion inefficiencies and emissions issues.
Innovation Solution
A fuel composition comprising a quaternary ammonium salt, non-quaternary polyisobutylene succinimide, and a Mannich base, in a specific mass ratio, is used to enhance detergency and prevent deposits, with a synergistic effect that maintains engine cleanliness and reduces emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional detergent additives are used in fuels, then some deposit formation is reduced, but new types of deposits form causing valve sticking and injector fouling
Solution Approach 1:
The patent applies composite materials by combining three distinct additive types (quaternary ammonium salt, polyisobutylene succinimide, and Mannich base) into a synergistic fuel composition. This composite approach addresses the technical contradiction by creating a multi-component system where each additive targets different deposit mechanisms, preventing both general deposit formation and specific harmful effects like valve sticking and injector fouling that occur with conventional single-component additives.
Solution Approach 2:
The patent employs parameter changes by optimizing the mass ratios of the three additives within specific ranges (quaternary ammonium salt: 0.1-1.0 wt%, polyisobutylene succinimide: 0.05-0.5 wt%, Mannich base: 0.05-0.5 wt%). By precisely controlling these compositional parameters, the formulation achieves effective deposit prevention while avoiding the formation of sticky deposits that cause valve sticking, resolving the contradiction between deposit reduction and harmful side effects.
2Productivity
If gasoline direct injection systems operate under severe pressure and temperature conditions, then combustion efficiency is improved, but deposit formation increases
Solution Approach 1:
The patent applies preliminary action by incorporating detergent additives into the fuel before injection, which pre-condition the fuel to prevent deposit formation during the severe combustion process. The quaternary ammonium salt, polyisobutylene succinimide, and Mannich base work proactively to inhibit deposit formation on injectors and combustion chamber surfaces before deposits can accumulate, thereby maintaining combustion efficiency without the harmful side effects of post-combustion cleaning.
Solution Approach 2:
The patent uses parameter changes by formulating additives with specific molecular weights and chemical structures optimized for direct injection conditions. The polyisobutylene succinimide with controlled molecular weight and the Mannich base with specific functional groups are designed to remain stable and effective under the high pressure and temperature conditions of direct injection, preventing deposit formation while maintaining the productivity benefits of severe combustion conditions.
3Device complexity
If single-component detergent additives are used, then formulation simplicity is maintained, but comprehensive deposit prevention is insufficient
Solution Approach 1:
The patent resolves this contradiction by creating a composite three-component additive system where each component has a distinct function: quaternary ammonium salt for general detergent action, polyisobutylene succinimide for adsorption and deposit prevention, and Mannich base for complementary protective effects. This composite formulation achieves comprehensive deposit prevention across multiple engine components while maintaining manageable formulation complexity through defined mass ratios and compatible chemistry.
Data Source
AI summary
The present invention relates to the use, for reducing deposits in the internal parts of a spark ignition engine, of a fuel composition comprising at least three additives: a quaternary ammonium salt, a non-quaternary polyisobutylene succinimide and a Mannich base which is different from the other additives. The composition is such that the mass ratio of the quantity of the first additive to the quantity of the second additive is in the range from 0.2: 1 to 2.5: 1.