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A CARBON CANISTER INSIDE PLASTIC FUEL TANKS (BLOW MOLDED OR TWIN SHEET)

IP.com Disclosure Number: IPCOM000236990D
Publication Date: 2014-May-23
Document File: 1 page(s) / 221K

Publishing Venue

The IP.com Prior Art Database

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A CARBON CANISTER INSIDE PLASTIC FUEL TANKS (BLOW MOLDED OR TWIN SHEET)

Vehicles sold in North America market are required to capture fuel vapors and store them inside a carbon canister. Carbon canisters are typically external to the fuel tank and are bulky. There exist challenges in packaging the entire evaporative system underbody due to space constraints. This is especially true in HEVs where the high voltage battery pack takes up considerable space. In order to meet the packaging guidelines, a complex line routing and intricate brackets must be designed which can drive up the cost on the Evap system.

Method

The invention centers around incorporating the canister inside the blow molded or twin sheet manufactured plastic fuel tanks to utilize the unused vapor dome space. In blow mold operation, the molten plastic parison is dropped as a multilayer fuel tank.It has an integral pinch set to create separate compartments in tank shell (see diagram below), thus isolating one area from another with no communication at all. Idea is that separate storage areas are created after blow molding of the fuel tank. This requires additional blow pins in manufacturing process to create separate chambers. The finished product reduces number of assembly steps in assembly plant andnumber of components in the sub-assembly as fuel tank supplier. Method resultsin lower overall cost - as carbon canister shell is free basically and no attachment method is required to body. Shorter...