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MITIGATION OF OVERFILL FUEL IN A TWO FUEL TANK SYSTEM

IP.com Disclosure Number: IPCOM000243968D
Publication Date: 2015-Nov-02
Document File: 1 page(s) / 342K

Publishing Venue

The IP.com Prior Art Database

Abstract

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MITIGATION OF OVERFILL FUEL IN A TWO FUEL TANK SYSTEM

Some heavy duty vehicles can have two independent fuel tanks The fuel tanks have their own pumps and fuel level indicators (FLI). Fuel level indicators max out at 100% when the float reaches top of travel. However, a customer can continue to "trickle fill" the gas tank even after the dispensing pump shuts off. Depending on the tank design, up to 3 gallons or more of fuel can be added beyond 100% fuel level indication. For instance, a 15 gallon capacity tank will read "Full" on the fuel gage if 15 gallons are dispensed. If 18 gallons are dispensed, fuel gage will also indicate "Full". The 3 extra gallons are unaccounted for in the total fuel amount. Adding extra fuel inside the vapor space is not desirable. Some margin of empty space is desirable in case a fuel tank is breached in a crash. Customers also complain that the "Miles to Empty" metric on the instrument cluster is inaccurate. A frequent factor for this inaccuracy is that the amount of additional fuel in the vapor dome is unknown and cannot be quantified or estimated without additional sensors.

Method

This method helps prevent overfilling of a fuel tank in a two tank system. Gas refueling beyond 100% FLI, which is overfilling, can be inferred by FLI = 100% but Fuel Tank Pressure Transducer (FTPT sensor) pressure steady at some value or spiking a few times as indication of further trickle filling. When the method detects that the fuel tank has had some...