Evaporated Fuel Canister Adsorbent Layer Segmentation

The canister is divided into multiple adsorbent layers (first, second, third adsorbent layers) with separating portions between them. This segmentation allows the separating portions to be positioned at specific locations where they can effectively suppress diffusion of fuel components without requiring the entire canister structure to be complex. Each separating portion acts as an independent element contributing to overall blow-by performance.

The separating portions act as intermediary elements between adjacent adsorbent layers. These separating portions with larger volumes serve as buffer zones that mediate the diffusion process, preventing fuel components from easily passing through from one adsorbent layer to another, thereby improving blow-by performance without requiring complete redesign of the adsorbent layers themselves.

The adsorbent structure is segmented into a main adsorbent layer and multiple additional adsorbent layers (first, second, third adsorbent layers) positioned in a specific region. This segmentation allows different adsorbent materials or configurations to be placed strategically where they provide maximum benefit for suppressing fuel component diffusion, rather than uniformly distributing all adsorbent material throughout the canister.

Different adsorbent layers are positioned at specific locations within the canister based on local requirements for diffusion suppression. The separating portions with larger volumes are strategically placed between these adsorbent layers at positions where diffusion control is most critical, allowing optimized performance without unnecessarily increasing total material quantity throughout the entire structure.