SYSTEMS AND METHODS FOR LIMITED EMISSIONS REFUELING
First Claim
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1. A method comprising:
- during a first condition, including an ongoing refueling event, receiving an indication of hydrocarbon breakthrough from a fuel vapor canister; and
restricting flow of fuel vapor through a fuel vapor canister vent pathway responsive to the indication of hydrocarbon breakthrough.
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Abstract
A method is presented, comprising, during a first condition, including an active refueling event, receiving an indication of hydrocarbon breakthrough from the fuel vapor canister; and restricting flow of fuel vapor through a fuel vapor canister vent pathway responsive to the indication of hydrocarbon breakthrough. Restricting the fuel vapor canister vent pathway will cause fuel tank pressure to increase, thus triggering an automatic shutoff of a refueling dispenser. In this way, the refueling event may be terminated without releasing significant quantities of hydrocarbons into the atmosphere.
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Citations
20 Claims
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1. A method comprising:
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during a first condition, including an ongoing refueling event, receiving an indication of hydrocarbon breakthrough from a fuel vapor canister; and restricting flow of fuel vapor through a fuel vapor canister vent pathway responsive to the indication of hydrocarbon breakthrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A fuel system for a vehicle, comprising:
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a fuel vapor canister vent pathway comprising a load conduit coupled to a fuel tank and a vent conduit coupled to atmosphere; one or more valves coupled within the fuel vapor canister vent pathway; a hydrocarbon sensor coupled within the vent conduit; a human machine interface configured to receive a refueling request from a vehicle operator and further configured to receive input from the vehicle operator indicating whether limited emissions refueling parameters are active; and a controller configured with instructions stored in non-transitory memory, that when executed, cause the controller to; depressurize the fuel tank via the fuel vapor canister vent pathway responsive to an indication that a refueling request has been received by the human machine interface; responsive to an indication that limited emissions refueling parameters are active, monitor an output of the hydrocarbon sensor during a refueling event; and close one or more valves coupled within the fuel vapor canister vent pathway responsive to the output of the hydrocarbon sensor increasing above a threshold. - View Dependent Claims (18, 19)
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20. A method for a vehicle, comprising:
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receiving a request for a refueling event; receiving an indication that limited emissions refueling parameters are active; venting a fuel tank to atmosphere via a fuel vapor canister; allowing access to a fuel filler neck responsive to an absolute fuel tank pressure decreasing below a threshold; monitoring an output of a hydrocarbon sensor coupled between the fuel vapor canister and atmosphere; and responsive to the output of the hydrocarbon sensor increasing above a threshold, restricting flow of fuel vapor between the fuel tank and atmosphere regardless of a fuel fill level in the fuel tank.
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Specification