Back to results
US 11,104,222 B2Granted
Systems and methods for vehicle multi-canister evaporative emissions systems
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for pinpointing a restriction in a vehicle evaporative emissions system which may adversely impact refueling and/or fuel vapor canister purging operations. In one example a method comprises conducting a diagnostic to identify a location of a restriction based on a rise time at which a pressure in a fuel system of a vehicle rises to a threshold pressure during a refueling event where fuel is added to the fuel system. In this way, a location of the restriction may be identified so as to enable appropriate mitigating action to be taken.
Claims13
A method comprising:
- diagnosing an evaporative emissions system including identifying a location of degradation in an evaporative emissions system of a vehicle based on a rise time at which a pressure in a fuel system of the vehicle rises to a threshold pressure during a refueling event where fuel is added to the fuel system via a refueling dispenser;
- and
- actuating a valve to bypass the location of degradation in response to the evaporative emissions system diagnostic identifying the location of degradation.
A method comprising:
- conducting an evaporative emissions system diagnostic to identify a location of a restriction in an evaporative emissions system of a vehicle based on a pressure rise time between a first time at which fuel is commenced being added to a fuel system of the vehicle via a refueling dispenser and a second time corresponding to a premature shutoff of the refueling dispenser;
- and
- controlling a valve positioned in the evaporative emissions system in response to the identified location of the restriction, wherein controlling the valve includes commanding open the valve in order to bypass the location of the restriction to enable fuel to continue being added to the fuel system without inducing another premature shutoff of the refueling dispenser.
Dependencies are inferred from the claim text.