Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1998-11-23
2000-08-08
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123557, F02N37004
Patent
active
060986018
ABSTRACT:
A fuel vapor storage and recovery apparatus including a fuel vapor storage canister having an atmospheric vent port, a control valve for opening and closing the atmospheric vent port, a fuel vapor adsorbent material in the vapor storage canister, a vapor/purge conduit between the vapor storage canister and a fuel tank, and a heater operative to heat the vapor adsorbent material. With the atmospheric vent port open, a fuel vapor/air mixture is expelled from the fuel tank into the vapor storage canister. A fuel vapor fraction of the fuel vapor/air mixture adsorbs in the pores of the adsorbent material while an air fraction of the mixture escapes through the atmospheric vent port. When the control valve closes the atmospheric vent port, the heater heats the body of adsorbent material to a purge temperature above an ambient temperature in the fuel tank. At the purge temperature, the adsorbed fuel desorbs and fills the storage canister with large volume of hot gaseous vapor. The resulting increased pressure in the vapor storage canister expels the hot vapor through the vapor/purge conduit back into the fuel tank where it condenses at the lower ambient temperature therein.
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Barr Jr. Karl F.
General Motors Corporation
Griffin Patrick M.
Miller Carl S.
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