Fuel Vapor Processing Apparatus L/D Ratio Adjustment
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Solution Overview
Problem
Existing fuel vapor processing apparatuses face challenges in setting the L/D ratio to prevent 'blow-through' phenomena without using seal members, leading to increased manufacturing costs and potential leakage issues.
Innovation Solution
A fuel vapor processing apparatus with an L/D ratio setting region within the adsorption material chamber, where an L/D ratio setting member is disposed to restrict the filling volume of adsorption material, preventing 'blow-through' without a seal member, and allowing for adjustable L/D ratios by varying the size or configuration of the setting member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal member (gasket) is used to prevent blow-through phenomenon, then fuel vapor can be prevented from leaking through non-filled space, but the number of parts and assembly steps increases, leading to increased manufacturing costs
Solution Approach 1:
The invention extracts and eliminates the seal member (gasket) from the system by redesigning the adsorption material chamber structure. The insert member creates a structured filling pattern that prevents blow-through without requiring any seal members, thus removing the source of potential leakage while reducing part count and assembly complexity.
Solution Approach 2:
The invention segments the adsorption material filling process by introducing an insert member that divides the chamber into structured zones. This segmentation creates a controlled filling pattern that prevents fuel vapor from bypassing the adsorption material, achieving seal-like functionality through structural division rather than through seal members.
2Adaptability or versatility
If different types of adsorption material cartridges are prepared for different L/D ratios, then the L/D ratio can be adjusted for different vehicle types, but the inventory complexity and selection difficulty increase
Solution Approach 1:
The invention introduces a dynamic adjustment mechanism where the insert member can be configured in different positions or removed entirely, allowing the L/D ratio to be adjusted within a single cartridge type. This dynamic configurability replaces the need for multiple static cartridge types, maintaining adaptability while reducing inventory complexity.
Solution Approach 2:
The insert member serves multiple functions: it structures the adsorption material filling, prevents blow-through phenomenon, and enables L/D ratio adjustment. This multi-functionality consolidates what would otherwise require different specialized cartridges into a single universal cartridge design with adjustable parameters.
3Reliability
If the L/D ratio is increased to improve adsorption ability, then residual fuel vapor decreases, but the resistance against air flow increases
Solution Approach 1:
The insert member creates local structural variations within the adsorption material chamber, concentrating adsorption material in specific zones where it is most effective. This local optimization allows for higher effective L/D ratio in critical areas while maintaining adequate air flow paths, balancing adsorption ability with flow 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 solution reduces manufacturing costs, minimizes the number of parts and assembly steps, prevents leakage, and enhances adsorption and desorption properties by ensuring the adsorption material closely contacts the chamber walls, while allowing for adjustable L/D ratios without seal members.
Implementation Method 1
fuel vapor (HC gas) can be adsorbed by the activated carbon 131
Implementation Method 2
the fuel vapor adsorbed by the activated carbon 131 is desorbed and discharged to the intake side of the engine
Data Source
AI summary
One aspect according to the present invention includes a fuel vapor processing apparatus including an insert. The insert can determine an effective flow passage area of the adsorption material chamber without producing a non-filled region of an adsorption material, through which fuel vapor containing gas flows.