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ESTIMATING AMOUNT OF FUEL INSIDE THE FUEL TANK’S ULLAGE SPACE USING EVAP LEAK DETECTION PUMP

IP.com Disclosure Number: IPCOM000239830D
Publication Date: 2014-Dec-04
Document File: 1 page(s) / 238K

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The IP.com Prior Art Database

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ESTIMATING AMOUNT OF FUEL INSIDE THE FUEL TANK'S ULLAGE SPACE USING EVAP LEAK DETECTION PUMP

Vehicles are typically oblivious to the amount of fuel in the fuel tank ullage space, i.e., in the vapor dome space of the fuel tank. Fuel level indicator (FLI) indicates "Full" status when the sender float reaches top of travel. The gas station fuel dispense pump typically shuts off to indicate the tank is full, however, some customers continue to "trickle fill" the gas tank even after the dispensing pump shuts off. Depending on the fuel 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 the customer was able to manage to dispense additional gallons of fuel, the fuel gage still indicates "Full". The extra gallons are unaccounted for in the total fuel amount.Customers complain that the "Miles to Empty" metric on the instrument cluster is inaccurate. Part of the inaccuracy is that the amount of fuel in the fuel tank vapor dome is unknown.A method to infer the total fuel inside the fuel tank beyond 100% Fuel level indication is being proposed.

Method

This design utilizes the Evap leak detection pump that is used to perform Evap leak diagnostics to infer the amount of extra fuel in the ullage space beyond 100% FLI reading. First, the system detects a refueling event where the FLI reads 100%. At that point, a special Evap syste...