Systems and methods for limited emissions refueling
First Claim
Patent Images
1. A method comprising:
- during a first condition, including an ongoing refueling event with a canister purge valve maintained closed, receiving an indication of hydrocarbon breakthrough from a fuel vapor canister; and
during the ongoing refueling event with the canister purge valve maintained closed, restricting flow of fuel vapor through a fuel vapor canister vent pathway responsive to the indication of hydrocarbon breakthrough by closing a valve.
1 Assignment
0 Petitions
Accused Products
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.
28 Citations
16 Claims
-
1. A method comprising:
-
during a first condition, including an ongoing refueling event with a canister purge valve maintained closed, receiving an indication of hydrocarbon breakthrough from a fuel vapor canister; and during the ongoing refueling event with the canister purge valve maintained closed, restricting flow of fuel vapor through a fuel vapor canister vent pathway responsive to the indication of hydrocarbon breakthrough by closing a valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method for a vehicle, comprising:
-
receiving a request for a refueling event; receiving an indication that limited emission 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 in a vent line between the fuel vapor canister and atmosphere during an ongoing refueling event with a canister purge valve maintained closed; and responsive to the output of the hydrocarbon sensor increasing above a threshold during the ongoing refueling event with the canister purge valve maintained closed, restricting flow of fuel vapor between the fuel tank and atmosphere along the vent line regardless of a fuel fill level in the fuel tank by closing a valve.
-
Specification