Canister Adsorption Member Core Material Gap Reduction
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Solution Overview
Problem
In canisters with adsorption members made by winding adsorption sheets, gaps between adjacent layers can allow fuel vapor to pass through without being adsorbed, reducing the effectiveness of vapor fuel capture.
Innovation Solution
The canister design incorporates a core material with a non-air-permeable structure around which the adsorption sheet is wound, bringing adjacent layers into closer contact and reducing gaps, thereby inhibiting fuel vapor passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the adsorption member is made by winding an adsorption sheet, then the adsorption capacity is improved, but gaps are created between adjacent layers allowing fuel vapor to pass through
Solution Approach 1:
A non-air-permeable core material is introduced as an intermediary around which the adsorption sheet is wound. This core material serves as a mediator that brings adjacent layers of the adsorption sheet into closer contact, reducing gaps while maintaining the winding structure's adsorption capacity.
Solution Approach 2:
The physical state and permeability parameters of the adsorption member are changed by introducing a non-air-permeable core material. This changes the overall permeability characteristic from permeable (with gaps) to non-permeable, while maintaining the winding configuration that provides high adsorption capacity.
2Ease of manufacture
If the adsorption sheet is wound without a core material, then the manufacturing process is simplified, but gaps between layers reduce adsorption effectiveness
Solution Approach 1:
The core material acts as a physical intermediary that facilitates precise layer contact during the winding process. It provides a stable central structure around which the adsorption sheet can be consistently wound, improving layer alignment and contact precision without significantly complicating the manufacturing process.
3Reliability
If a non-air-permeable core material is used, then fuel vapor passage is inhibited, but the device complexity increases
Solution Approach 1:
The core material serves multiple functions simultaneously: it provides structural support for the wound adsorption sheet, acts as a non-air-permeable barrier to inhibit vapor passage through the center, and serves as a winding mandrel during manufacturing. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
4Manufacturing precision
If the adsorption sheet layers are brought into closer contact, then gaps are reduced and vapor passage is inhibited, but the manufacturing process becomes more complex
Solution Approach 1:
The core material serves as a permanent intermediary structure that maintains close contact between adsorption sheet layers during both manufacturing and operation. By providing a fixed central form, it enables precise layer contact to be achieved through the winding process itself without requiring additional post-manufacturing steps or complex assembly procedures.
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 effectively reduces gaps in the adsorption member, enhancing the adsorption and desorption of fuel vapor, and minimizing leakage from the atmosphere port.
Implementation Method 1
The canister adsorbs the vapor fuel to an adsorption member
Implementation Method 2
The core material may be non-air-permeable. This configuration makes it possible to inhibit passage of the fuel vapor through the core material
Data Source
AI summary
One aspect of the present disclosure provides a canister configured to adsorb and desorb fuel vapor generated in a fuel tank of a vehicle. The canister includes a charge port configured to take in the fuel vapor, a purge port configured to release the fuel vapor, an atmosphere port open to an atmosphere, a first adsorption chamber and a second adsorption chamber directly coupled to the charge port and the purge port or indirectly coupled to the charge port and the purge port via an additional chamber, a first adsorption member housed in the first adsorption chamber, and a second adsorption member housed in the second adsorption chamber. The first adsorption member includes a core material and an adsorption sheet having properties to adsorb the fuel vapor and wound around the core material.