IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0480048
(2009-06-08)
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등록번호 |
US-8245699
(2012-08-21)
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발명자
/ 주소 |
- Peters, Mark
- Hoffman, Steven James
- Hedges, John
|
출원인 / 주소 |
- Ford Global technologies, LLC
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
10 인용 특허 :
22 |
초록
▼
A fuel vapor recovery system and method for an automotive vehicle are disclosed. The vehicle fuel tank is vented to atmosphere via a passageway having a carbon canister to remove fuel vapors, a bladder, and a normally-closed isolation valve. When fueling the vehicle, the gases in the fuel tank displ
A fuel vapor recovery system and method for an automotive vehicle are disclosed. The vehicle fuel tank is vented to atmosphere via a passageway having a carbon canister to remove fuel vapors, a bladder, and a normally-closed isolation valve. When fueling the vehicle, the gases in the fuel tank displaced by entering fuel are introduced into the carbon canister where the fuel vapors are stored. The isolation valve is commanded to open to allow such flow through the carbon canister. When the vehicle is parked for a period of a day, it undergoes a diurnal temperature change which causes fuel to vaporize into the fuel system. According to an aspect of the present development, the isolation valve remains closed and the gases are contained within the bladder as it expands or contracts as the volume of gases increases or decreases in response to temperature changes.
대표청구항
▼
1. A fuel vapor recovery system for a vehicle having a fuel tank, an engine, and a carbon canister fluidly coupled to the fuel tank and selectively fluidly coupled to the engine and atmosphere, comprising: a bladder outside of the fuel tank and fluidly coupled to at least one of a vent of the fuel t
1. A fuel vapor recovery system for a vehicle having a fuel tank, an engine, and a carbon canister fluidly coupled to the fuel tank and selectively fluidly coupled to the engine and atmosphere, comprising: a bladder outside of the fuel tank and fluidly coupled to at least one of a vent of the fuel tank and the carbon canister, wherein the bladder is disposed between the fuel tank and a normally-closed electro-mechanical isolation valve. 2. The system of claim 1 wherein the normally-closed, electro-mechanical isolation valve is fluidly coupled to one of the carbon canister and the bladder, and to atmosphere, the isolation valve coupling one of the carbon canister and the bladder to atmosphere in response to a signal from an electronic control unit during refueling of the vehicle. 3. The system of claim 1 wherein the normally-closed electro-mechanical isolation valve is fluidly coupled to one of the carbon canister and the bladder, and to atmosphere, the system further comprising:an electronic control unit electronically coupled to the isolation valve coupling one of the carbon canister and the bladder to atmosphere in response to a signal from an electronic control unit during refueling of the vehicle. 4. The system of claim 3 wherein the isolation valve opens when pressure exceeds atmospheric pressure by a predetermined amount, thereby coupling one of the carbon canister and the bladder to atmosphere. 5. The system of claim 2 wherein the vehicle has a fuel door coupled to an exterior of the vehicle and the fuel door is proximate an opening of the fuel tank into which fuel is supplied, the system further comprising: a sensor electronically coupled to the electronic control unit, the sensor providing an indication that the vehicle is being refueled. 6. The system of claim 1 further comprising: a generally rigid bladder retainer containing the bladder within, the bladder retainer having at least one orifice to atmosphere and the bladder retainer fluidly decoupled from the bladder. 7. The system of claim 1 wherein the bladder comprises: a perforated passageway extending from a first port to a second port within the bladder, the first port coupled to one of the fuel tank and the carbon canister and the second port coupled to one of the carbon canister and atmosphere, respectively. 8. The system of claim 1 wherein the bladder comprises a flexible non-resilient material. 9. The system of claim 1, further comprising: a normally-closed, electro-mechanical purge valve fluidly coupling the engine to the carbon canister in response to a command from an electronic control unit to purge the carbon canister. 10. The system of claim 9, further comprising: a normally-closed, electro-mechanical isolation valve fluidly coupled to one of the carbon canister and the bladder, and to atmosphere, the isolation valve coupling one of the carbon canister and the bladder to atmosphere in response to a command from an electronic control unit to purge the carbon canister. 11. A method to operate a fuel vapor recovery system disposed in an automotive vehicle, comprising: opening an isolation valve in response to an indication that the vehicle is being fueled, the fuel vapor recovery system comprising: a fuel tank, a carbon canister, a bladder, and the isolation valve arranged serially, with the carbon canister and bladder disposed between the isolation valve and the fuel tank outside of the fuel tank. 12. The method of claim 11 wherein the automotive vehicle has a fuel door with a switch and the indication that the vehicle is being fueled is at least partially based on a signal from the switch. 13. The method of claim 11 wherein the automotive vehicle has an internal combustion engine disposed therein, the method further comprising: opening the isolation valve and a purge valve when the engine is operating at a condition favorable for purging the carbon canister. 14. The method of claim 11 wherein that automotive vehicle has an internal combustion engine disposed there, the method further comprising: opening the isolation valve and a purge valve to initiate a purge of the carbon canister. 15. The method of claim 11 wherein the carbon canister has three ports: a first port coupled to the fuel tank, a second port coupled to the bladder, and a third port coupled to an intake of the engine and the fuel vapor recovery system also comprises a purge valve disposed in between the intake of the engine and the carbon canister, the method further comprising: opening the purge valve substantially simultaneously with the isolation valve. 16. The method of claim 11, further comprising: determining whether the vehicle is being fueled;determining whether purging is occurring; andcommanding the isolation valve and a purge valve to close when neither of fueling and purging is occurring.
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