Adsorption-Based Fuel Separation for Onboard Cetane and Octane Control
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Solution Overview
Problem
Existing vehicular fuel systems for internal combustion engines face challenges in efficiently separating onboard fuel into octane-rich and cetane-rich components, leading to increased size, weight, and complexity, particularly in achieving a heat balance during fuel enrichment processes.
Innovation Solution
A vehicular propulsion system incorporating an adsorption-based fuel separation unit with a heat exchanger and controller to selectively separate onboard fuel into octane-rich and cetane-rich components, utilizing adsorbent-based chambers to vaporize and desorb adsorbates, and directing fuel flow based on engine operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distillation or membrane-based permeation-evaporation activities are used for onboard fuel separation, then fuel enrichment can be achieved, but significant increases in size, weight and overall complexity of the onboard fuel-reforming infrastructure occur
Solution Approach 1:
The patent replaces complex mechanical separation systems (distillation columns, membrane-based permeation-evaporation systems) with a thermal-based adsorption system using a single adsorbent material that selectively captures cetane or aromatics from fuel through temperature-controlled cycles, significantly reducing infrastructure complexity while maintaining fuel enrichment capability
Solution Approach 2:
The patent utilizes temperature parameter changes to control the adsorption and desorption cycles of the adsorbent material, enabling selective fuel component separation without requiring complex mechanical separation infrastructure, thereby reducing system size and weight while achieving desired fuel enrichment
2Stability of the object's composition
If pre-separated octane-enriched or cetane-enriched portions are used, then fuel composition control is improved, but the use of parallel storage tanks and associated delivery conduit increases system complexity
Solution Approach 1:
The patent merges the storage and separation functions into a single integrated system where fuel is stored in one tank and separated on-demand through the adsorption system, eliminating the need for parallel pre-separated storage tanks and their associated delivery conduit while maintaining precise fuel composition control
Solution Approach 2:
The patent implements a dynamic separation system that can adjust fuel composition in real-time based on engine requirements by controlling the adsorption and desorption cycles, replacing the static pre-separated fuel storage approach and reducing system complexity
3Weight of stationary object
If adsorption-based separation is implemented, then system size and weight are reduced, but achieving heat balance during fuel enrichment becomes more challenging
Solution Approach 1:
The patent converts the heat generated by engine operation (which would be waste heat) into a beneficial resource for driving the desorption cycle of the adsorption system, achieving heat balance by utilizing otherwise wasted thermal energy to enable continuous fuel enrichment without additional energy input
Solution Approach 2:
The patent designs the fuel separation system to be self-sustaining by using the vehicle's own engine heat to power the desorption process, eliminating the need for external energy sources and achieving autonomous operation while maintaining reduced system weight
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 system effectively reduces the size and complexity of fuel separation infrastructure while maintaining efficient heat balance, enabling customizable fuel injection strategies for improved engine efficiency and reduced emissions.
Implementation Method 1
The separation unit includes one or more adsorbent-based chambers such that the separation unit may selectively receive and separate at least a portion of the onboard fuel into an adsorbate and a remainder
Implementation Method 2
The heat exchanger works with the separation unit to selectively deliver residual thermal energy that results from operation of the ICE to at least one adsorbent-based chamber to heat and subsequently vaporize (that is to say, desorb) at least some of the adsorbate
Implementation Method 3
The heat exchanger works with the separation unit to selectively deliver residual thermal energy that results from operation of the ICE to at least one adsorbent-based chamber to heat and subsequently vaporize (that is to say, desorb) at least some of the adsorbate
Data Source
AI summary
A vehicular propulsion system, a vehicular fuel system and a method of operating an internal combustion engine. A separation unit that makes up a part of the fuel system includes one or more adsorbent-based chambers such that the separation unit may selectively receive and separate at least a portion of onboard fuel into octane-enhanced and cetane-enhanced components. Regeneration of an adsorbate takes place through a heat exchange relation with existing system infrastructure. A controller may be used to determine a particular operational condition of the internal combustion engine such that the onboard fuel can be sent to one or more combustion chambers within the internal combustion engine without first passing through the separation unit, or instead to the separation unit in situations where the internal combustion engine may require an octane-rich or cetane-rich mixture, where adsorbed and remainder portions taken from the separation unit may be stored in separate tanks for later mixing and use within the combustion chamber.