Deposit-Forming Reference Fuel Composition for Engine Testing
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Solution Overview
Problem
The industry lacks a repeatable and consistent reference fuel composition that can produce high levels of intake valve and port fuel injector oxidized carbon deposits, essential for testing detergent additives and evaluating engine hardware, as existing fuel compositions vary in deposit formation due to differences in refinery streams and engine types.
Innovation Solution
A deposit-forming reference fuel composition comprising a high sulfur base fuel with greater than 50 weight % sulfur, a reactive diolefin dopant, and a reaction initiating peroxide with active oxygen content and specific half-life temperature, in a concentration ratio greater than 1:1, is developed to consistently create deposits on both port fuel injection and spark ignition direct injection engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reference fuel composition is used to test detergent additives, then the effectiveness of additives can be evaluated, but the deposit formation varies due to differences in refinery streams and engine types
Solution Approach 1:
The patent modifies the chemical parameters of the fuel composition by specifying exact ranges for sulfur content (200-500 ppm), aromatic hydrocarbon content (20-40 vol%), olefin content (10-30 vol%), and peroxide concentration (0.1-1.0 wt%). These controlled parameter changes create a standardized reference fuel that produces consistent deposits across different testing conditions, resolving the variability issue while maintaining broad applicability.
Solution Approach 2:
The reference fuel composition is created as a composite material combining multiple components: high sulfur base fuel, aromatic hydrocarbons, olefins, and peroxide additives. This composite formulation synergistically produces repeatable carbon deposits on intake valves and fuel injectors, providing a reliable testing medium that works across different refinery streams and engine types simultaneously.
2Object-generated harmful factors
If high sulfur base fuel is used to increase deposit formation, then carbon deposits are produced, but the fuel composition becomes more complex
Solution Approach 1:
Rather than using arbitrarily high sulfur content, the patent optimizes the sulfur parameter to a specific range (200-500 ppm) that balances deposit formation capability with compositional simplicity. This optimized parameter setting generates sufficient carbon deposits for effective testing while avoiding the complexity and variability associated with excessively high sulfur fuels.
Solution Approach 2:
The patent applies local quality by concentrating the deposit-forming components (aromatics, olefins, peroxide) in specific proportions rather than uniformly distributing all components. This localized concentration of reactive species ensures efficient carbon deposit formation while keeping the overall fuel composition relatively simple and manageable.
3Object-affected harmful factors
If detergent additives are added to reduce deposits, then fouling is controlled, but the reference fuel can no longer consistently produce high deposits for testing
Solution Approach 1:
The patent extracts and removes detergent additives from the reference fuel composition, creating a pure deposit-forming fuel without any fouling control substances. This extraction ensures that the fuel consistently produces high levels of carbon deposits for reliable testing, while the detergent additives are separately introduced only during the actual effectiveness evaluation phase, not as part of the reference fuel itself.
Solution Approach 2:
The reference fuel is prepared in advance with all necessary deposit-forming components pre-mixed in optimized proportions. This preliminary preparation ensures that when testing begins, the fuel immediately and consistently produces the desired carbon deposits without requiring any additional additives or adjustments, maintaining reliable and repeatable test conditions.
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
This composition results in repeatable and high levels of carbon deposits, allowing for effective evaluation of detergent additives and engine hardware, with results showing consistent intake valve deposits and injector plugging across multiple tests, supporting the development of enhanced gasoline detergency standards.
Implementation Method 1
a reaction initiating peroxide having an active oxygen content greater than or equal to 2 weight % based on total oxygen content of the reaction initiating peroxide and a half-life temperature of 80° C. to 200° C.
Implementation Method 2
produce a high amount of intake valve (IV) and port fuel injector (PFI) oxidized carbon deposits
Data Source
AI summary
In some embodiments, a deposit-forming reference fuel composition comprises a high sulfur base fuel composition in an amount greater than 50 weight % based on total weight % of the deposit-forming reference fuel composition, wherein the high sulfur base fuel composition comprises greater than or equal to 200 ppm sulfur based on total sulfur content of the base fuel composition. The deposit-forming reference fuel composition also comprises a reactive diolefin dopant; and a reaction initiating peroxide. The reaction initiating peroxide has an active oxygen content greater than or equal to 2 weight % based on total oxygen content of the reaction initiating peroxide and a half-life temperature of 80° C. to 200° C. The deposit-forming reference fuel composition is free from a detergent additive and has a concentration ratio of greater than 1:1 for the reactive diolefin dopant to the reaction initiating peroxide.