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A LABYRINTH DUST MITIGATOR ON CARBON CANISTERS

IP.com Disclosure Number: IPCOM000237284D
Publication Date: 2014-Jun-11
Document File: 1 page(s) / 221K

Publishing Venue

The IP.com Prior Art Database

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A LABYRINTH DUST MITIGATOR ON CARBON CANISTERS

Vehicles sold in North America are required to perform Evap leak detection. Green states required to monitor for 0.02" leaks. Federal states are required to perform 0.04" leak check. Heavy duty applications are required to perform 0.09" leak checks. Future PHEV fuel tanks will have a 0.01" leak requirement.One of the biggest sources of Evap leaks is contamination from the build process or the external environment entering the Evap system and depositing on the Evap valves. Studies have shown contamination to be a big source of Evap warranty. While dust boxes can prevent certain types of contaminants from entering the Evap system, some still make it through. Other built-in contaminants such as manufacturing process flashing, carbon pellets, debris from shipping containers can work their way to the Evap Canister Purge Valve (CPV) valve and cause Evap system leakages.

Method

The invention centers around capturing and trapping internal Evap system contamination into a labyrinth trap. The trap is integral to the carbon canister. During the purge process, air flows across the canister. Any contamination present in the Evap system is forced to traverse a zig-zag or a circular route where it becomes trapped permanently inside the labyrinth. The path travelled is not straight as in previous canister design methods. This way contamination does not make its way to the Evap CPV valve. The CPV is a choke point for contaminants a...