Fuel Vapor Canister Partitioning for Adsorption Efficiency
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Solution Overview
Problem
Existing canisters for fuel vapor processing in automobiles are complex and costly to manufacture, which hinders the facilitation of fuel filling operations without increasing resistance against fuel vapor flow.
Innovation Solution
A canister design featuring a first and second fuel vapor adsorption device with a partitioning member that divides the atmospheric communication chamber into air flow and adsorption material passages, allowing gas to flow through in different directions, reducing resistance and improving adsorption efficiency while simplifying construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic adsorption material having a honeycomb or slit structure is used as the auxiliary adsorption material, then the fuel vapor adsorption ability is improved, but the construction of the canister becomes complicated and manufacturing cost increases
Solution Approach 1:
The patent uses a partition wall with a simple structure that copies the functional effect of complex ceramic adsorption materials. The partition wall creates flow path restrictions that simulate the adsorption effect, achieving similar fuel vapor adsorption ability without the complexity of honeycomb or slit structures.
Solution Approach 2:
The patent replaces expensive, complex ceramic adsorption materials with a simpler, more economical partition wall structure. This partition wall can be easily manufactured and replaced, providing the necessary adsorption function at lower cost and with simpler construction.
2Ease of operation
If the resistance against flow of the fuel vapor containing gas through the auxiliary chamber is set to be smaller, then the fuel filling operation is facilitated, but the fuel vapor adsorption ability may be reduced
Solution Approach 1:
The patent applies local quality by creating different flow resistance characteristics in different regions of the auxiliary chamber. The partition wall is positioned to create localized flow restrictions that maintain adsorption ability in critical areas while allowing easier flow in other regions, thus facilitating fuel filling operations without sacrificing overall adsorption 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
Facilitates fuel filling operations by reducing gas flow resistance and enhancing fuel vapor adsorption ability while minimizing manufacturing costs compared to traditional designs.
Implementation Method 1
The main adsorption material 113 is filled within the main chamber (i.e., the first chamber 121 and the second chamber 122) for adsorbing a fuel component contained in a mixture of air and vaporized fuel introduced into the main chamber from a fuel tank
Data Source
AI summary
A canister includes a first fuel vapor adsorption device and a second fuel vapor adsorption device. The second fuel vapor adsorption device can adsorb a part of fuel vapor that still remains in a gas after desorption by the first fuel vapor adsorption device. The second fuel vapor adsorption device includes a first passage containing a fuel vapor adsorption material and a second passage containing no fuel vapor adsorption material. The first passage and the second passage allow the gas to flow therethrough. A gas introduction device allows the fuel vapor to flow from the second passage into the first passage.