Canister Internal Structure for Activated Carbon Utilization
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Solution Overview
Problem
The existing canister designs for vehicle fuel tanks do not efficiently utilize activated carbon for adsorbing and desorbing evaporated fuel, leading to poor utilization efficiency due to uneven ventilation resistance around bar members, which results in reduced effectiveness of the activated carbon in areas distant from the bar members.
Innovation Solution
A canister design with a filling chamber containing internal components arranged in a specific configuration, forming sparse and dense areas along the flow direction, where the first and second components are positioned differently and non-overlapping in the flow direction, reducing ventilation resistance and enhancing the utilization efficiency of activated carbon by facilitating the flow of evaporated fuel into high-density areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bar members are arranged in the filling chamber to reduce ventilation resistance, then ventilation resistance in the vicinity of bar members is reduced, but utilization efficiency of activated carbon in areas distanced from bar members deteriorates
Solution Approach 1:
The filling chamber is divided into multiple filling regions with different filling densities. The first filling region has a first filling density and the second filling region has a second filling density different from the first. This segmentation allows different areas to have optimized ventilation characteristics, with lower density regions providing better airflow paths while higher density regions maintaining adequate activated carbon contact areas.
Solution Approach 2:
Different filling densities are applied to different regions of the filling chamber. Specifically, certain areas have reduced filling density to create improved ventilation paths, while other areas maintain higher filling density. This local quality variation ensures that ventilation resistance is reduced without sacrificing overall activated carbon utilization efficiency.
2Quantity of substance
If activated carbon is densely packed to maximize adsorption capacity, then adsorption capacity increases, but ventilation resistance increases and fuel flow is discouraged
Solution Approach 1:
The activated carbon filling is segmented into regions with different densities. Some regions have higher filling density to maximize adsorption capacity, while other regions have lower filling density to maintain ventilation resistance at acceptable levels. This allows the system to achieve both high adsorption capacity and adequate fuel flow.
Solution Approach 2:
Different local filling densities are implemented throughout the filling chamber. Areas with higher adsorption demands have denser packing, while areas requiring better ventilation have sparser packing. This local quality differentiation resolves the contradiction between maximizing carbon quantity and maintaining low ventilation resistance.
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 configuration improves the overall utilization efficiency of activated carbon by creating alternating sparse and dense areas, encouraging the flow of evaporated fuel into dense areas, thereby optimizing the use of activated carbon and reducing ventilation resistance.
Implementation Method 1
The canister adsorbs the evaporated fuel to activated carbon, desorbs fuel from the activated carbon with aspirated air for purging
Implementation Method 2
filled in a filling chamber of the canister, and pressurized with a spring or the like to reduce an occurrence of a clearance
Data Source
AI summary
A canister includes a filling chamber and an internal structure. The filling chamber is filled with activated carbon. The internal structure includes a first component and a second component that are arranged in the filling chamber. The first component is located at a position that is different from a position of the second component in a flow direction of an evaporated fuel in the filling chamber and is positioned such that at least a portion thereof does not overlap in position with the second component when projected onto a plane perpendicular to the flow direction.