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US 11,111,867 B1Granted
Systems and methods for an evaporative emissions control system
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for reverse purging in a non-integrated refueling canister only system based on diurnal temperature variation. In one example, a method may include during a vehicle-off condition, in response to an estimated cooling of fuel in a fuel tank, unseal the fuel tank by pulsing a refueling valve (RV) to an open position. The cooling of the fuel may be estimated based on output of a first solar cell.
Claims20
A method for an engine in a vehicle, comprising:
- during a vehicle off condition, in response to an estimated cooling of fuel in a fuel tank, opening a refueling valve (RV) to unseal the fuel tank, the estimated cooling of the fuel based on output of a first solar cell.
A method for an engine, comprising:
- during a vehicle off condition,
- in response to detection of sunset via a first solar cell, pulsing a refueling valve (RV) coupling a fuel tank to a fuel vapor canister of an evaporative emissions control system to an open position;
- and
- in response to detection of sunrise via a second solar cell, pulsing the RV to a closed position.
1 more element
A system for an engine in a vehicle, comprising:
- a controller with computer-readable instructions stored on non-transitory memory that when executed cause the controller to:
- in response to a request for a vehicle off,
- estimate a load in a fuel vapor canister of an evaporative emissions control system;
- and
- in response to a higher than threshold load in the fuel vapor canister,
- activate a comparator circuit to open a refueling valve (RV) regulating flow of fuel vapor between a fuel tank and the fuel vapor canister in response to a decrease in solar radiance as detected via a first solar cell configured on a surface of the vehicle.
3 more elements
Dependencies are inferred from the claim text.