Systems and methods for refueling canister system
AssigneeFord Global Technologies, LLC
InventorsBryan Michael Bolger, Michael Paul Lindlbauer, Mark W. Peters
Life of this patent
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Abstract
Methods and systems are described for depressurizing a fuel tank prior to refueling. In one example, before refueling the fuel tank having a pressure above a first predetermined pressure, the pressure may be released through a first valve to the first predetermined pressure and the first valve may be closed. Further, a second valve may be opened to further reduce the pressure to a second predetermined pressure, and if flow through the second valve is less than desired, then the first valve may be opened until the second predetermined pressure is reached.
Claims20
A method comprising:
- before refueling a fuel tank having a pressure above a first predetermined pressure, releasing said pressure through a first valve to said predetermined pressure and then closing said first valve and opening a second valve to further reduce said pressure to a second predetermined pressure;
- and
- if flow through said second valve is less than desired, then opening said first valve until said second predetermined pressure is reached.
A method comprising:
- before refueling a fuel tank having a pressure above a first predetermined pressure, and when flow through a first and a second valve coupled to the fuel tank is at least at a desired flow,
- releasing said pressure through a first valve to said first predetermined pressure and then closing said first valve and opening a second valve to further reduce said pressure to a second predetermined pressure;
- and
- if flow through said first valve is less than desired, then opening said second valve until said first predetermined pressure is reached.
A method comprising:
- before refueling a fuel tank having a pressure below a first predetermined pressure, releasing said pressure through a second valve to a second predetermined pressure;
- and
- if said second valve is restricted and said pressure does not reach said second predetermined pressure within an expected time, then opening a first valve until said second predetermined pressure is reached, said first valve normally being used when said pressure is above said first predetermined pressure to reduce said pressure to said first predetermined pressure.
Dependencies are inferred from the claim text.