Methods and systems for controlling a fuel tank isolation valve coupled to a fuel tank in a vehicle are disclosed. In one example approach, a method comprises, in response to a refuel request, actuating a fuel tank isolation valve to vent a fuel tank for refueling; and, in response to a pressure in
Methods and systems for controlling a fuel tank isolation valve coupled to a fuel tank in a vehicle are disclosed. In one example approach, a method comprises, in response to a refuel request, actuating a fuel tank isolation valve to vent a fuel tank for refueling; and, in response to a pressure in the fuel tank below a threshold pressure after a predetermined time duration, discontinuing actuation of the fuel tank isolation valve to seal the fuel tank.
대표청구항▼
1. A method for a vehicle with an engine, comprising: receiving a refuel request;in response to the refuel request, actuating a fuel tank isolation valve via a controller to vent a fuel tank for refueling;detecting a fuel tank pressure; andin response to the fuel tank pressure being below a threshol
1. A method for a vehicle with an engine, comprising: receiving a refuel request;in response to the refuel request, actuating a fuel tank isolation valve via a controller to vent a fuel tank for refueling;detecting a fuel tank pressure; andin response to the fuel tank pressure being below a threshold pressure after a predetermined time duration, discontinuing actuation of the fuel tank isolation valve to seal the fuel tank. 2. The method of claim 1, wherein the refuel request comprises one or more of an actuation of a switch by a vehicle operator and a detection of an open refuel door. 3. The method of claim 1, wherein discontinuing actuation of the fuel tank isolation valve to seal the fuel tank is performed while fuel is being added to the fuel tank. 4. The method of claim 1, further comprising discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to detection of a refuel door closed. 5. The method of claim 1, further comprising discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to a vehicle speed greater than a speed threshold. 6. The method of claim 1, further comprising, after discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to a pressure in the fuel tank above the threshold pressure. 7. The method of claim 1, further comprising, after discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank. 8. The method of claim 1, further comprising, after discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank and then discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to detection of a refuel door closed. 9. The method of claim 1, further comprising, after discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank and then discontinuing actuation of the fuel tank isolation valve to seal the fuel tank after a predetermined refuel time duration. 10. The method of claim 1, further comprising, after discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank and then discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to a vehicle speed greater than a threshold. 11. The method of claim 1, wherein the vehicle is a hybrid electric vehicle. 12. A method for a vehicle, comprising: during an engine-off condition: receiving a refuel request;opening a fuel tank isolation valve via a controller to vent a fuel tank for refueling in response to the refuel request;detecting a fuel tank pressure; andin response to the fuel tank pressure decreasing below a threshold pressure after a predetermined time duration, closing the fuel tank isolation valve to seal the fuel tank. 13. The method of claim 12, wherein the refuel request comprises one or more of an actuation of a switch by a vehicle operator and a detection of an open refuel door. 14. The method of claim 12, wherein closing the fuel tank isolation valve to seal the fuel tank is performed before the refueling is complete. 15. The method of claim 12, further comprising closing the fuel tank isolation valve to seal the fuel tank in response to detection of a refuel door closed. 16. The method of claim 12, further comprising closing the fuel tank isolation valve to seal the fuel tank in response to a vehicle speed greater than a speed threshold, wherein the vehicle is a hybrid electric vehicle. 17. The method of claim 12, further comprising, after closing the fuel tank isolation valve to seal the fuel tank, opening the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank. 18. A method for a hybrid electric vehicle, comprising: receiving a refuel request;in response to the refuel request, actuating a fuel tank isolation valve to vent a fuel tank via a controller for refueling;detecting a pressure in the fuel tank;in response to the pressure in the fuel tank below a threshold pressure after a predetermined time duration, discontinuing actuation of the fuel tank isolation valve to seal the fuel tank before the refueling is complete; andafter discontinuing actuation of the fuel tank isolation valve to seal the fuel tank, actuating the fuel tank isolation valve to vent the fuel tank in response to an increase in pressure in the fuel tank. 19. The method of claim 18, further comprising discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to detection of a refuel door closed. 20. The method of claim 18, further comprising discontinuing actuation of the fuel tank isolation valve to seal the fuel tank in response to a vehicle speed greater than a speed threshold.
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