Method and system of purging evaporative emission control canister using heated purge air
AssigneeGM Global Technology Operations LLC
InventorSam Reddy
Life of this patent
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Abstract
Method and system of purging evaporative emission control canister using heated purge air comprises a scrubber containing an activated carbon fiber material or carbon monolith selected to adsorb butane and/or pentane isomer vapors in low concentrations in air passing through the scrubber and to desorb the adsorbed butane and/or pentane isomers when purged with exhaust heated purge air. A method for reducing bleed emission to almost zero mg per day uses exhaust heated air purging of the scrubber.
Claims20
An evaporative emission control system, comprising
- a hydrocarbon scrubber selected to adsorb butane and/or pentane isomer vapors in low concentrations in air passing through the scrubber and to desorb the adsorbed butane and/or pentane isomers when contacted with heated air.
An evaporative emission control system for a vehicle, comprising:
- a fuel tank for storing a volatile fuel;
- a canister having one or more chambers containing activated carbon granules, said canister having a vapor inlet coupled with the fuel tank, a purge inlet coupled to an air induction inlet for an engine, and an air inlet, wherein said one or more chambers are located between the vapor inlet and the air inlet;
- and
- a scrubber containing activated carbon fiber material or carbon monolith, said scrubber being either a further chamber of the canister located between a last chamber containing activated carbon granules and the air inlet or a separate canister coupled to said air inlet,
- wherein said scrubber is positioned to supply heated purge air to said scrubber during purging.
A method for reducing bleed emissions from an evaporative emission control system for a vehicle, comprising venting the evaporative emission control system to a hydrocarbon scrubber capable of adsorbing butane and/or pentane isomer vapors in low concentrations in air and capable of desorbing the adsorbed butane and/or pentane isomers when contacted with heated purge air.
A method for reducing emissions from a vehicle having a fuel tank, comprising steps of:
- passing fuel/air vapor from the fuel tank first through a quantity of activated carbon granules and then through a quantity of an activated carbon fiber material or carbon monolith,
- wherein said quantity of activated carbon granules is capable of adsorbing a desired amount of fuel vapor,
- and further wherein said quantity of activated carbon fiber material or carbon monolith is capable of adsorbing butane and pentane isomer vapor contained in concentrations of less than 10,000 parts per million by volume in air so that emissions from the fuel tank are reduced to less than about 5 mg per day.
Dependencies are inferred from the claim text.