IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0790791
(2010-05-28)
|
등록번호 |
US-8447495
(2013-05-21)
|
발명자
/ 주소 |
- Pearce, Russell Randall
- Bohr, Scott
- Kragh, Christopher
- DeBastos, Timothy
- Sullivan, Patrick
- Kerns, James Michael
- Olson, Chad Michael
|
출원인 / 주소 |
- Ford Global Technologies, LLC
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
11 인용 특허 :
33 |
초록
▼
A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the
A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum the HEV fuel vapor recovery system.
대표청구항
▼
1. A method for a fuel vapor recovery system including a fuel tank and a canister, comprising, purging a first amount of fuel vapors from the canister to an engine intake while isolating the canister from the tank; andafter purging the first amount, purging a second amount of fuel vapors from the ta
1. A method for a fuel vapor recovery system including a fuel tank and a canister, comprising, purging a first amount of fuel vapors from the canister to an engine intake while isolating the canister from the tank; andafter purging the first amount, purging a second amount of fuel vapors from the tank to the canister while isolating the canister from the intake, the second amount adjusted based on the first amount. 2. The method of claim 1, wherein the purging is during a condition that includes a canister pressure being greater than a first threshold. 3. The method of claim 2, wherein the fuel tank is coupled to the canister through a first valve, and the canister is coupled to the engine intake through a second valve, and wherein purging the first amount includes maintaining the first valve closed to isolate the fuel tank from the canister while opening the second valve to couple the canister to the engine intake. 4. The method of claim 3, wherein purging the second amount includes opening the first valve to couple the fuel tank to the canister. 5. The method of claim 4, wherein during purging of the second amount, opening of the first valve is adjusted based on at least one of a canister pressure and a fuel tank pressure. 6. The method of claim 5, wherein the adjustment of the first valve includes opening the first valve when at least one of the canister pressure is lower than the first threshold and the fuel tank pressure is greater than a second threshold. 7. The method of claim 6, wherein the fuel tank pressure is estimated by a first pressure sensor coupled to the fuel tank, and wherein the canister pressure is estimated by a second pressure sensor coupled to the canister. 8. The method of claim 7, further comprising, after purging the second amount, closing the first valve. 9. The method of claim 8, wherein completion of refueling is indicated by at least one of a fuel tank pressure exceeding a threshold, a refueling door sensor indicating a refueling door being closed, and a fuel level sensor exceeding a threshold, and wherein purging of the first or second amount is initiated in response to the completion of refueling. 10. The method of claim 1, further comprising, in response to a request for refueling, delaying purging of the first amount and the second amount at least until refueling is completed. 11. A vehicle system, comprising, a battery;an engine including an engine intake, the engine selectively started and stopped responsive to a battery state of charge;a fuel system comprising, a fuel tank with a first opening for receiving fuel and a second opening for delivering fuel vapors along a first conduit;a canister with a first opening for receiving air from an atmosphere, a second opening for receiving fuel vapors from the fuel tank along the first conduit, and a third opening for relaying stored fuel vapors to the engine intake along a second conduit;a vacuum accumulator including a venturi, the vacuum accumulator coupled to the canister along the second conduit through a vacuum accumulator valve;a fuel tank isolation valve, positioned in the first conduit, coupling the fuel tank to the canister;a canister purge valve, positioned in the second conduit, coupling the canister to the engine intake;a canister vent valve coupled to the first opening of the canister,a first pressure sensor in the first conduit for estimating a fuel tank pressure;a second pressure sensor in the second conduit for estimating a canister pressure; anda control system with computer readable instructions for, during a purging condition, when the canister pressure is greater than a threshold,isolating the fuel tank while purging a first amount of fuel vapors from the canister to the engine intake;after purging the first amount of fuel vapors, coupling the fuel tank while isolating the canister from the intake and purging a second amount of fuel vapors from the fuel tank, the second amount adjusted based on the first amount; andafter purging the second amount, isolating the fuel tank. 12. The system of claim 11, wherein isolating the fuel tank includes closing the fuel tank isolation valve and coupling the fuel tank includes opening the fuel tank isolation valve. 13. The system of claim 12, wherein purging the first amount includes opening the canister purge valve and the canister vent valve. 14. The system of claim 13, wherein purging the second amount includes closing the canister purge valve and the canister vent valve to purge fuel vapors to the canister when the fuel tank pressure is below a threshold, and opening the canister purge valve and the canister vent valve to purge fuel vapors to the engine intake when the fuel tank pressure is above the threshold. 15. The system of claim 11, wherein the control system further includes instructions for, in response to a request for refueling, delaying purging until refueling is completed. 16. The system of claim 15, wherein refueling includes, opening a fuel tank door and receiving fuel in the fuel tank after the fuel tank pressure has dropped below a threshold. 17. The system of claim 16, wherein a completion of refueling is indicated by at least one of the fuel tank pressure exceeding the threshold, a fuel door sensor indicating a refueling door is closed, and a fuel level sensor exceeding a threshold. 18. The system of claim 11, wherein the purging condition includes the engine being in an engine-on mode of operation, and a canister pressure being greater than a threshold. 19. A vehicle fuel vapor recovery system, comprising, a fuel tank coupled to a canister through a fuel tank isolation valve, the fuel tank configured to receive fuel through a refueling door;a canister, configured to store fuel vapors, coupled to an engine intake through a canister purge valve, the canister further coupled to a vacuum accumulator;a first pressure sensor coupled to the fuel tank to estimate a fuel tank pressure;a second pressure sensor coupled to the canister to estimate a canister pressure; anda control system with computer readable instructions for, during an engine-on mode of operation, opening the canister purge valve while closing the fuel tank isolation valve to purge a first amount of stored fuel vapors to the engine intake when the canister pressure is greater than a threshold;after purging the first amount of stored fuel vapors, opening the fuel tank isolation valve while closing the canister purge valve to purge a second amount of fuel vapors to the canister when the fuel tank pressure is greater than a first threshold; andafter purging the first amount of stored fuel vapors, opening the fuel tank isolation valve while maintaining the canister purge valve open to purge the second amount of fuel vapors to the engine intake when the fuel tank pressure is greater than a second threshold higher than the first threshold. 20. The system of claim 19, wherein the control system further includes instructions for, in response to a request for refueling, delaying purging until refueling is completed, a completion of refueling indicated by a closing of a refueling door. 21. The system of claim 20, wherein a duration of delaying is adjusted based on a fuel level in the fuel tank and/or a fuel tank pressure after refueling, including delaying purging for a longer duration as the fuel level and/or the fuel tank pressure increase during refueling.
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