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Automated Variable Fuel Fill Method for Autonomous Vehicles to Lower Evaporative Emissions

IP.com Disclosure Number: IPCOM000249096D
Publication Date: 2017-Feb-06
Document File: 1 page(s) / 196K

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Automated Variable Fuel Fill Method for Autonomous Vehicles to Lower Evaporative Emissions

Gas stations dispense gasoline at a constant rate. Depending on the number of customers refueling at

the same time, the capacity of in ground fuel tank and actual station pump performance, the dispense

rates vary greatly…. from 4 GPM to 12 GPM flow rate can be expected.Dispensing gasoline at a high rate

pleases the customer as the refuel event is shorter.Refueling studies indicates that high fuel fill rates

generate more vapors since they are turbulent and agitate the liquid fuel inside the tank, and more

vapor is generated. When liquid enters the fuel tank under high pressure, it agitates the fuel inside the

tank and causes more vapors to generate. If the canister is empty, then there is no problem with

dispensing at the high fill rate. However, if the canister is not cleaned out (due to lack of engine run time

such as in Start/Stop of Hybrid Electric Vehicles) and canister still has residual vapors stored in it, then

filling at the high fill rate could overwhelm the canister and cause hydrocarbon breakthrough to

atmosphere.CARB currently allows OEMs a 0.1gram/gal total emissions during ORVR refueling

procedure. The evaporative emissions allowance emit out of the canister vent port or out of the cap

area during refueling. In the future, that quota will decrease as Evaporative emission regulations

become stricter.


With advent of autonomous car, customary fueling is changing a...