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US 11,441,498 B1Granted
Method and system for reducing evaporative emissions
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are presented for controlling flow through a recirculation tube of an evaporative emissions system. The methods and systems may adjust flow through the recirculation tube by controlling an amount of time an evaporative emissions system valve is held open and held closed during refilling of a fuel tank.
Claims18
A vehicle system, comprising:
- a vehicle including an internal combustion engine, a fuel tank, and an evaporative emissions system valve;
- and
- one or more controllers in the vehicle, the one or more controllers including executable instructions stored in non-transitory memory that cause the one or more controllers to open and close the evaporative emissions system valve during refilling of the fuel tank, adjust opening and closing the evaporative emissions system valve in response to a fuel tank pressure during refilling of the fuel tank, and increase an amount of time that the evaporative emissions valve is closed in response to a pressure in the fuel tank being less than a first threshold.
A method for operating an evaporative emissions system, comprising:
- repeatedly cycling an evaporative emissions system valve open and closed via a controller while a fuel tank is being filled.
A method for operating an evaporative emissions system, comprising:
- adjusting a flow through a recirculation tube of an evaporative emissions system via controller according to a pressure in a fuel tank while the fuel tank is being filled.
Dependencies are inferred from the claim text.