Fuel Composition for High Octane Spark Ignition Engines
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Solution Overview
Problem
Modern spark ignition engines, especially those with high compression ratios and racing vehicles, require fuels with high Research Octane Number (RON) to prevent knocking and maximize engine power. Current fuels often rely on toxic organometallic compounds or require high doses of non-metal based additives, which are environmentally unfriendly. Additionally, there is a need for fuels with high biocompound content that maintain or enhance engine performance.
Innovation Solution
A fuel composition comprising 60-94% by weight of a hydrocarbon mixture with specific ratios of aromatic compounds, n-paraffins, and iso-paraffins, along with 5-36% by weight of ethanol and 1-10% by weight of butane, which provides high RON octane numbers without the need for additional octane boosters. This composition can be formulated from biosourced compounds, making it environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the volumetric compression ratio in an engine is increased to improve efficiency, then engine power is improved, but the risk of abnormal knocking-type combustion increases
Solution Approach 1:
The patent changes the chemical composition parameters of the fuel by incorporating oxygenated compounds (alcohols, ethers, esters) and specific hydrocarbon ratios to achieve high RON values (95-105), which enables the fuel to resist knocking at high compression ratios
Solution Approach 2:
The fuel is formulated as a composite mixture containing multiple components: oxygenated compounds (10-30% by volume), aromatic compounds (20-40% by volume), naphthenes (5-20% by volume), and paraffins (30-50% by volume), where each component contributes specific properties to achieve both high power and knocking resistance
2Measurement precision
If organometallic compounds are added to increase octane number, then RON is improved, but environmental friendliness deteriorates
Solution Approach 1:
The patent extracts and eliminates toxic organometallic compounds (lead, manganese, iron) from the fuel composition, replacing them with environmentally friendly oxygenated compounds and hydrocarbons that achieve high RON without metal additives
Solution Approach 2:
The patent uses readily available, biodegradable oxygenated compounds (ethanol, methanol, isopropanol, butanol) and plant-based esters as temporary replacements for persistent metal additives, achieving the desired octane boost without long-term environmental contamination
3Object-affected harmful factors
If bioethanol is mixed with gasoline to improve environmental friendliness, then biocompound content is improved, but engine power deteriorates
Solution Approach 1:
The patent merges oxygenated compounds (bioethanol, esters) with high-energy aromatic compounds (toluene, xylenes) and naphthenes in specific proportions, creating a synergistic blend where the oxygenates provide clean combustion and the aromatics/naphthenes provide high energy density, achieving both environmental friendliness and high power
Solution Approach 2:
The patent optimizes the volume percentage parameters of each component, specifically setting oxygenated compounds at 10-30% (higher than conventional E10), aromatics at 20-40%, and adjusting the overall formulation to achieve RON 95-105, thereby maintaining or enhancing engine power while improving environmental performance
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 fuel composition achieves high RON octane numbers, allowing for increased engine power in vehicles with high compression ratios, including racing vehicles. It also reduces nitrogen oxide emissions and can meet standard EN 228 specifications, making it suitable for both racing and general public use vehicles.
Implementation Method 1
combustion of the gasoline fuel composition in the engine
Data Source
AI summary
The present invention relates to a fuel composition comprising: (i) 60 to 94% by mass of a hydrocarbon mixture comprising: (a) 35 to 55% by mass of aromatic compounds; (b) 30 to 50% by mass of a mixture of n-paraffins and iso-paraffins containing at least 5 carbon atoms, with a ratio of the amount of iso-paraffins to the amount of n-paraffins greater than or equal to 3; and (c) 5 to 15% by mass of naphtenes; (ii) 5 to 36% by mass of ethanol; and (iii) 1 to 10% by mass of butane. This composition is useful for fuelling a spark ignition engine in motor vehicles intended for use by the general public or in competition.