System and methods for purging a fuel vapor canister
First Claim
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1. A method for purging a fuel vapor canister, comprising:
- responsive to an indication of vapor slugs determined via a controller,reversing a direction of air flow through the fuel vapor canister in a vehicle via a valve while maintaining purge air intake at a vent line inlet, the valve adjusted via the controller.
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Abstract
A method for purging a fuel vapor canister, comprising: responsive to an indication of vapor slugs, reversing a direction of air flow through the fuel vapor canister while maintaining purge air intake at a vent line inlet. By reversing the direction of air flow through the fuel vapor canister, the vapor slugs may be adsorbed within the fuel vapor canister and may not affect engine operation. In this way, purge operation may be maintained and emissions may be reduced.
23 Citations
19 Claims
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1. A method for purging a fuel vapor canister, comprising:
responsive to an indication of vapor slugs determined via a controller, reversing a direction of air flow through the fuel vapor canister in a vehicle via a valve while maintaining purge air intake at a vent line inlet, the valve adjusted via the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for an engine, comprising:
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a fuel tank; a fuel vapor canister comprising a fuel vapor canister buffer coupled to the fuel tank, the fuel vapor canister buffer arranged at a first end of the fuel vapor canister; a purge line coupling the fuel vapor canister to an engine intake via a canister purge valve; a vent line coupling the fuel vapor canister to a fresh air source; a canister vent valve coupled between the fuel vapor canister and the vent line, the canister vent valve operable between a first conformation and a second conformation; a reversing valve coupled between the fuel vapor canister buffer and the purge line, the reversing valve operable between a first conformation and a second conformation; and a controller having executable instructions stored in a non-transitory memory for; when canister purge conditions are met, drawing air through the fuel vapor canister with the canister vent valve in the first conformation and with the reversing valve in the first conformation; and in response to inferring fuel vapor release higher than a threshold vapor release from the fuel tank as determined via the controller, drawing air through the fuel vapor canister with the canister vent valve in the second conformation and with the reversing valve in the second conformation. - View Dependent Claims (10, 11, 12, 13)
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14. A method for purging a fuel vapor canister, comprising:
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coupling a first fuel vapor canister port to an engine intake; coupling a second fuel vapor canister port to a fresh air source; opening a canister purge valve coupled between the first fuel vapor canister port and the engine intake via a controller; and responsive to an indication of fuel vapor release from a fuel tank higher than a threshold vapor release as determined via the controller, coupling the second fuel vapor canister port to the engine intake and coupling the first fuel vapor canister port to the fresh air source via the controller. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification