EVAPORATIVE EMISSION CONTROL SYSTEM WITH NEW ADSORBENTS
First Claim
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1. An evaporative emissions control system for a vehicle, comprising:
- a fuel tank for storing a volatile fuel;
an engine having an air induction system;
at least one canister containing an adsorbent material, wherein the adsorbent material has a nearly linear isotherm;
a vapor inlet on the canister coupled to the fuel tank;
a purge outlet on the canister coupled to the air induction system;
a first vent opening on the canister for allowing fuel vapor to enter and exit said canister;
a scrubber canister fluidically coupled to canister through said first vent opening, said scrubber canister including an activated carbon adsorbent material;
wherein the adsorbent material and said activated carbon adsorbent material adsorbs fuel vapors when the engine is not running and desorbs fuel vapors when the engine is running.
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Abstract
One embodiment of the invention includes an adsorbent canister in a vehicle and an adsorbent having a nearly linear isotherm provided in the adsorbent canister.
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Citations
18 Claims
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1. An evaporative emissions control system for a vehicle, comprising:
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a fuel tank for storing a volatile fuel; an engine having an air induction system; at least one canister containing an adsorbent material, wherein the adsorbent material has a nearly linear isotherm; a vapor inlet on the canister coupled to the fuel tank; a purge outlet on the canister coupled to the air induction system; a first vent opening on the canister for allowing fuel vapor to enter and exit said canister; a scrubber canister fluidically coupled to canister through said first vent opening, said scrubber canister including an activated carbon adsorbent material; wherein the adsorbent material and said activated carbon adsorbent material adsorbs fuel vapors when the engine is not running and desorbs fuel vapors when the engine is running. - View Dependent Claims (2, 3, 4, 6, 7, 8)
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5. (canceled)
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9. A method for reducing purge air flow requirements of an evaporative emissions control system for a vehicle comprising:
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storing a volatile fuel in a fuel tank; providing at least one canister containing an adsorbent material and including a first vent opening, wherein the adsorbent material has a nearly linear isotherm; coupling a vapor inlet of the canister to the fuel tank; coupling a purge outlet of the canister to an air induction system of an engine of the vehicle; fluidically coupling a scrubber canister having an activated carbon adsorbent material to the canister through said first vent opening; adsorbing fuel vapors when the engine is not running using the adsorbent material and the activated carbon adsorbent material; and desorbing fuel vapors from the adsorbent material and from the activated carbon adsorbent material when the engine is running. - View Dependent Claims (11, 12, 13)
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10. (canceled)
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14. A hybrid vehicle comprising an internal combustion engine and an electric motor, the hybrid vehicle further comprising:
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a fuel tank for storing a volatile fuel; an engine having an air induction system; at least one canister containing an adsorbent material, wherein the adsorbent material has a nearly linear isotherm; a vapor inlet coupled to the fuel tank; a purge outlet coupled to the air induction system; a first vent opening on the canister; a scrubber canister fluidically coupled to the canister through said first vent opening, said scrubber canister including an activated carbon adsorbent material; wherein the adsorbent material and said activated carbon adsorbent material adsorbs fuel vapors when the engine is not running and desorbs fuel vapors fuel vapors when the engine is running. - View Dependent Claims (15, 16)
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17. (canceled)
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18. (canceled)
Specification