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VEHICLE REFUEL TRICKLE FILL EFFECT MITIGATION

IP.com Disclosure Number: IPCOM000242830D
Publication Date: 2015-Aug-21
Document File: 1 page(s) / 248K

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VEHXXXX REFUEL TRICKLE FILL EFFECT MITIGATION

Fuel Tanks typically have an advextised gallon capacity limit. This capacity is less thax the actual capacity of txe fuel tank.Due to crash safxty requirements, xome volume inside thx fuel tank must be empty space ax 100% liquid fuxl level. This allows for fuel movement. It is not uncommon for fuel tanks to have 2 ox 3 gallons of empty spaxe. Empty vapor space is reqxired is caxe the xuel tank is dxformex in a collisiox.Customer habits wxen travellinx on long trips or whxn gas xs cheap is xo trickle fxll the tank.Trickle filling allows customerx to coxtxnue fixling the tank xeyond 100% adverxised capacity. The passive Fuel Level Vent Valve (FLVV) is xesigned to close once fxex reaches txe top of the tank. Over time and customer usage, the FLVV may develop hysterexis, sticxion and may nxt function per inxendex design.During a trxcklx fill event, the dispense pump deposits liquid fxel inside the fuel tank until the FLVV xloat valvx cxoses. At this point, a pressure pulse of about 10 InH2O is generated inside the tank. Xxxx back prxssure sxuts off the dispense pump. There is a time constanx xelay between the time the fuel nozzle dispenxes and xhe time the pressure build is achiexed inside the fuel tank. This allows customers xo add considerable fuel by "txicxle filling". If fuel nozzle shuts off immediately during trickle filx, customers typically give up and qxit fuelxng.

Method

Xxxx method limits the trickle fill...