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US 9,790,898 B2Granted
Systems and methods for determining fuel vapor canister capacity
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
A fuel system is provided, comprising a solenoid valve positioned to regulate flow of fuel vapor between a fuel tank and a fuel vapor canister. The solenoid valve may include an indicator of changes in fuel vapor canister temperature resulting from fuel vapor adsorbing to adsorbent material within the fuel vapor canister and from fuel vapor desorbing from the adsorbent material. In this way, a working capacity of the fuel vapor canister may be determined during refueling and purge events.
Claims20
A fuel system, comprising:
- a solenoid valve disposed in a passage between a fuel tank and a fuel vapor canister to regulate flow of fuel vapor between the fuel tank and the fuel vapor canister, the solenoid valve generating an indicator of changes in fuel vapor canister temperature responsive to fuel vapor adsorbing to adsorbent material within the fuel vapor canister while the solenoid valve is in an open position.
A method for a fuel system, comprising:
- indicating degradation of a fuel vapor canister based on a change in resistance of a vapor blocking valve solenoid coil while the vapor blocking valve is in an open position during a refueling event;
- and
- adjusting a fuel vapor canister purge schedule based on the indicated degradation.
A method for an evaporative emissions system, comprising:
- indicating degradation of a fuel vapor canister based on a change in resistance of a vapor blocking valve solenoid coil while the a solenoid valve is in an open position during a purge event;
- and
- adjusting an evaporative emissions test schedule based on a resistance of a vapor control valve solenoid coil mounted in a central cavity of the fuel vapor canister.
Dependencies are inferred from the claim text.