Method and system of purging evaporative emission control canister using heated purge air
First Claim
1. An evaporative emission control system comprising a hydrocarbon scrubber comprising a body, and a carbon material contained in the body constructed and arranged to adsorb low molecular weight hydrocarbons in a vapor stream from a vehicle fuel tank;
- a combustion engine exhaust system, and wherein a portion of the exhaust system is constructed and arranged to transfer heat through the scrubber body and to heat purge air flowing through the scrubber and so that low molecular weight hydrocarbons are desorbed from the carbon material.
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Accused Products
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.
51 Citations
20 Claims
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1. An evaporative emission control system comprising a hydrocarbon scrubber comprising a body, and a carbon material contained in the body constructed and arranged to adsorb low molecular weight hydrocarbons in a vapor stream from a vehicle fuel tank;
a combustion engine exhaust system, and wherein a portion of the exhaust system is constructed and arranged to transfer heat through the scrubber body and to heat purge air flowing through the scrubber and so that low molecular weight hydrocarbons are desorbed from the carbon material. - View Dependent Claims (2, 3, 4)
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5. An evaporative emission control system for a vehicle, comprising:
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a fuel tank for storing a volatile fuel; a first canister comprising one or more chambers comprising activated carbon granules, said canister comprising a vapor inlet coupled with the fuel tank, a purge inlet coupled to an air induction inlet for en engine, and an air inlet, wherein said one or more chambers are located between the vapor inlet and the air inlet; and a scrubber comprising activated carbon fiber material or carbon monolith, said scrubber being either a further chamber of the canister located between a last chamber comprising activated carbon granules and the air inlet or a separate second canister coupled to said air inlet, wherein said scrubber is positioned to supply heated purge air to said chamber comprising activated carbon granules; a combustion engine exhaust system, and wherein a portion of the exhaust system is constructed and arranged to heat purge air, the purge air flowing through the scrubber so that low molecular weight hydrocarbons are desorbed from the activated carbon fiber material or carbon monolith of the scrubber. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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- 13. 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 low molecular weight hydrocarbon vapors in low concentrations in air and capable of desorbing the adsorbed low molecular weight hydrocarbons, heating purge air with heat from an exhaust system of the vehicle and flowing the heated purge air through the scrubber to desorb the low molecular weight hydrocarbons from the scrubber.
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18. A method for reducing emissions from a vehicle having a fuel tank, comprising:
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passing fuel/air vapor comprising low and high molecular weight hydrocarbons from the fuel tank first through a quantity of activated carbon granules to adsorb high molecular weight hydrocarbons and then through a quantity of an activated carbon fiber material or carbon monolith to adsorb low molecular weight hydrocarbons; 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 low molecular weight hydrocarbons 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, and heating purge air with heat from a vehicle exhaust system to desorb low molecular weight hydrocarbons from the activated carbon fiber material or carbon monolith. - View Dependent Claims (19, 20)
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Specification