Patent ID: 11879408
Assignee: FORD GLOBAL TECHNOLOGIES, LLC
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A method for an engine in a vehicle, comprising:
upon receiving a request for refueling,
during a first condition, actuating a fuel tank isolation valve (FTIV) to a first position to depressurize a fuel tank via fuel vapor flow to a load port of a canister positioned on a first end of the canister,
during a second condition, actuating the FTIV to a second position to depressurize the fuel tank via fuel vapor flow to a depressurization port of the canister positioned on a second end of the canister opposite the first end,
during depressurization, indicating degradation of the FTIV based on a rate of pressure decay in the fuel tank, and
in response to each of the rate of pressure decay in the fuel tank during depressurization being lower than a decay threshold rate and one or more premature shut-offs during refueling, indicating degradation of a cross over valve (COV) of an evaporative leak check module (ELCM) housed in a vent line.