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US 2023/0037814 A1Published application
Methods and systems for evaporative emission control system diagnostics
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
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Abstract
Methods and systems are provided for diagnosing degradation and/or alteration in an evaporative emission control system of a vehicle. In one example, a method may include, during a refueling, monitoring a fuel tank pressure and a fuel fill level, and detecting a presence or an absence of a fuel vapor canister of the EVAP system based on a change in fuel tank pressure with an increase in fuel level.
Claims20
A method for an engine in a vehicle, comprising:
- detecting a presence or an absence of a fuel vapor canister of an evaporative emissions control (EVAP) system based on a change in fuel tank pressure with an increase in fuel level.
A method for an engine, comprising:
- during a refueling, indicating absence of one or more fuel vapor canisters in an evaporative emissions control (EVAP) system based on a comparison of a normalized fuel tank pressure to one or more threshold pressure levels.
A system for an engine in a vehicle, comprising:
- an evaporative emissions control (EVAP) system coupled to a fuel system, the EVAP system including at one or more fuel vapor canisters;
- a controller storing instructions in non-transitory memory that, when executed, cause the controller to:
- during refueling,
- estimate a fuel fill level in a fuel tank via a fuel level sensor;
- estimate a fuel tank pressure via a fuel tank pressure sensor;
- estimate a fuel fill rate as a function of a time to fill the fuel tank to capacity;
- estimate a normalized fuel tank pressure as a function of the estimated fuel tank pressure and the fuel fill rate;
- and
- indicate one or more fuel vapor canisters missing based on the normalized fuel tank pressure being lower than a first threshold pressure.
6 more elements
Dependencies are inferred from the claim text.