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VOICE ACTIVATED FUEL TANK DEPRESSURIZATION TECHNIQUE

IP.com Disclosure Number: IPCOM000245728D
Publication Date: 2016-Apr-01
Document File: 1 page(s) / 187K

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The IP.com Prior Art Database

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 54% of the total text.

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VOICE ACTIVATED FUEL TANK DEPRESSURIZATION TECHNIQUE

Plug-in Hybrid Electric Vehicles (PHEV) have a sealed fuel tank. A Fuel Tank Isolation Valve (FTIV) is normally closed and the fuel tank is made of heavy steel to withstand pressures and vacuum builds from a diurnal temperature cycle.Since the fuel tank is sealed, the canister is sized to adsorb refueling and depressurization vapors only. Running loss and diurnal vapors are contained inside the fuel tank.Additionally, fuel doors on PHEV are locked to prevent an operator from refueling a pressurized fuel tank.To refuel a PHEV, a dash mounted switch is pressed to indicate to the Powertrain Control Modula (PCM) of the desire to refuel. PCM strategy monitors the pressure/vacuum inside the tank and opens the FTIV to vent the fuel tank.Only when fuel tank pressure is near atmosphere is the fuel door unlocked to allow refueling. This protects the operator from getting sprayed with fuel mist.AFuel Tank Pressure Transducer (FTPT) sensor is used to measure the pressure inside the tank. With a PHEV, there are modes where the vehicle is pulls up to a gas station in electric mode or in a combusting mode. There are also times when customers inadvertently press the refuel button. This results in unneeded depressurizations of fuel tank as well as in excessive canister vapor loading. There are other times when the customer leaves the car at the gas station, forgets to press the dash button. The customer must then re-ente...