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US 9,803,592 B2Granted
Fuel vapor blocking valve control
AssigneeFord Global Technologies, LLC
InventorsRoss Dykstra Pursifull, Mark W. Peters, Brian Thomas Aitken
Life of this patent
Estimating the term…
Abstract
Methods and systems for controlling and reducing current consumption of a vapor blocking valve are disclosed. In one example, current supplied to the vapor blocking valve is adjusted proportionately to fuel tank pressure to compensate for fuel tank pressure acting on the vapor blocking valve. Vapor blocking valve current is adjusted to reduce current consumption.
Claims19
A vapor blocking valve control method, comprising:
- receiving sensor input to a controller;
- adjusting a vapor blocking valve holding current for a vapor blocking valve that is closed based on a fuel tank pressure via the controller;
- and
- adjusting a value of a vapor blocking valve transfer function and supplying a pull-in current to the vapor blocking valve when the vapor blocking valve holding current fails to hold the vapor blocking valve closed.
1 more element
A vapor blocking valve control method, comprising:
- receiving sensor input to a controller;
- proportionately adjusting a vapor blocking valve current for a closed vapor blocking valve based on a fuel tank pressure via the controller;
- supplying current to a vapor blocking valve in response to the vapor blocking valve current;
- and
- adapting a transfer function via the controller in response to an indication of vapor blocking valve opening when the vapor blocking valve is commanded closed.
2 more elements
A fuel vapor purging system, comprising:
- a fuel vapor storage canister including activated carbon;
- a fuel tank;
- a vapor blocking valve positioned along a passage between the fuel tank and the fuel vapor storage canister;
- and
- a controller including executable instructions stored in non-transitory memory to proportionately adjust current supplied to the vapor blocking valve based on fuel tank pressure when the vapor blocking valve is commanded closed, and additional instructions to determine the vapor blocking valve is open responsive to output of two filters having different time constants.
2 more elements
Dependencies are inferred from the claim text.