Onboard Oxygenate Separation for Fuel Octane Optimization
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Solution Overview
Problem
Current technologies lack an efficient onboard system to separate high and low octane components from existing market fuels, such as E10 gasoline, to optimize engine performance and reduce knock in internal combustion engines, due to the absence of a suitable infrastructure and consumer education on dual-fuel systems.
Innovation Solution
A system that uses selectively releasable capture materials, including ionic liquids and self-assembled monolayers on mesoporous supports, to separate and reintroduce ethanol and other oxygenates from gasoline, allowing for real-time delivery of high-octane fuel during high engine load conditions, thereby optimizing fuel efficiency and reducing knock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ethanol and other oxygenates are added to gasoline to increase octane rating and reduce knock, then knock resistance is improved, but fuel cost increases and unnecessary consumption of high-octane components occurs during low engine load
Solution Approach 1:
The system dynamically adjusts the octane rating of fuel by separating oxygenates from gasoline and selectively reintroducing them based on real-time engine load conditions. During high load, oxygenates are reintroduced to prevent knock; during low load, they are withheld to improve fuel efficiency. This dynamic adjustment resolves the contradiction between maintaining knock resistance and optimizing fuel efficiency.
Solution Approach 2:
The system changes the compositional parameter of the fuel by separating oxygenates from gasoline and controlling their reintroduction. The oxygenate content in the fuel is varied based on engine operating conditions, allowing the octane rating to be adjusted dynamically. This parameter change enables the system to achieve high knock resistance only when necessary, thereby improving overall fuel efficiency.
2Loss of energy
If a dual-fuel system with separate high-octane and low-octane fuel tanks is implemented to optimize octane delivery, then fuel efficiency can be improved, but device complexity and infrastructure requirements increase
Solution Approach 1:
Instead of requiring two separate fuel tanks and delivery systems, the system extracts oxygenates from conventional gasoline through onboard separation and selectively reintroduces them. This extraction approach eliminates the need for complex dual-fuel infrastructure while achieving the same fuel efficiency benefits, as the separation and selective reintroduction can be accomplished with simpler equipment.
Solution Approach 2:
The system uses a single fuel tank and delivery system that can handle both high-octane and low-octane conditions by dynamically adjusting oxygenate content. The onboard separation and reintroduction mechanism enables the conventional fuel system to perform multiple functions: delivering high octane when needed and improving fuel efficiency when not needed, without requiring separate fuel storage and delivery infrastructure.
3Reliability
If oxygenates are continuously supplied to maximize knock resistance, then engine reliability under high load is improved, but fuel economy deteriorates during low load operation
Solution Approach 1:
The system implements periodic action by selectively reintroducing oxygenates based on engine load conditions. Oxygenates are reintroduced during high-load periods when knock resistance is needed and withheld during low-load periods when they provide no benefit. This periodic reintroduction strategy maintains engine reliability when necessary while optimizing fuel economy during normal operation.
Solution Approach 2:
The system applies local quality by delivering high oxygenate content fuel only to specific operating conditions (high load) where it is needed for knock prevention, while using low oxygenate content fuel during other conditions (low load) where it would waste energy. This localized application of high-octane fuel properties resolves the contradiction between reliability and fuel economy.
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 approach enables significant fuel economy improvements of up to 26% and reduces greenhouse gas emissions by optimizing the use of high-octane components, while avoiding the need for new fuel infrastructure and consumer education.
Implementation Method 1
introducing the gasoline to a separator containing an ionic liquid, to form a polar ionic liquid layer that absorbs ethanol and/or oxygenates from the commercial gasoline as a bound ionic liquid that is immiscible with the gasoline
Implementation Method 2
introducing the gasoline to a separator containing self-assembled monolayers on mesoporous supports, to form a polar ionic liquid layer that absorbs ethanol and/or oxygenates from the commercial gasoline
Data Source
AI summary
Methods for separation of oxygenates or other chemical components from fuels using chemical processes and separations including, but not limited to, onboard applications in vehicles. These separations may take place using a variety of materials and substances whereby a target material of interest is captured, held, and then released at a desired location and under desired conditions. In one set of experiments we demonstrated an enhancement in the separation of diaromatics by >38 times over gasoline and aromatics by >3.5 times over gasoline. This would give an advantage to reducing cold-start emissions, or emissions during transient conditions, in either gasoline or diesel.