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CARBON CANISTER WITH INTERNAL PELTIER DEVICES TO IMPROVE HYDROCARBON DESORPTION

IP.com Disclosure Number: IPCOM000240795D
Publication Date: 2015-Mar-03
Document File: 1 page(s) / 292K

Publishing Venue

The IP.com Prior Art Database

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CARBON CANISTER WITH INTERNAL PELTIER DEVICES TO IMPROVE HYDROCARBON DESORPTION

Vehicles sold worldwide typically contain a carbon canister that adsorbs refueling, diurnal and running loss vapors.Engine running manifold vacuum is used to desorb the vapor from the activated carbon canister via opening of Canister Purge Valve (CPV). Desorbed vapors are combusted in the engine. This technique is commonly known as "purging". The canister's ability to desorb fuel vapors is enhanced at hotter temperatures. Ideally, when purging it is desired for the canister carbon bed to be hot in order to clean it more efficiently. Heat stimulates hydrocarbon (HC) desorption from carbon bed. Furthermore, during purging when the activated carbon is desorbed from HC, an endothermic chemical reaction occurs and the canister's purge port becomes very cold. At times, ice builds inside it. Too much ice buildup impedes at the canister's purge port (blocks purge flow).

Method

This device imbeds solid state Peltier devices within the carbon canister to facilitate both heating for optimal desorption and to prevent freezing at the canister's purge port. Voltage is applied to the Peltier device to generate heat. The Peltiers are energized from 12V battery soruce via PCM drivers. Right before purging, the Peltier devices are turned on to heat carbon bed. A Peltier device imbedded inside of the canister's carbon bed provides major benefits by desorbing the canister more efficiently and lowering...