SYSTEMS AND METHODS FOR MANAGING BLEED EMISSIONS IN PLUG-IN HYBRID ELECTRIC VEHICLES
First Claim
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1. A method for a plug-in hybrid electric vehicle, comprising:
- during a first condition, including an engine-off condition and the plug-in hybrid electric vehicle coupled to an external power source;
heating a fuel vapor canister based on a fuel tank vacuum; and
opening a fuel tank isolation valve to draw heated vapors into a fuel tank.
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Abstract
A method for a plug-in hybrid electric vehicle, comprising: during a first condition, including an engine-off condition and the plug-in hybrid electric vehicle coupled to an external power source; heating a fuel vapor canister based on a fuel tank vacuum; and opening a fuel tank isolation valve to draw heated vapors into a fuel tank. In this way, a passive purge operation may be executed, thereby purging the fuel vapor canister without forcing the engine to turn on. Thus, the vehicle may be operated at peak fuel economy without increasing emissions.
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Citations
20 Claims
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1. A method for a plug-in hybrid electric vehicle, comprising:
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during a first condition, including an engine-off condition and the plug-in hybrid electric vehicle coupled to an external power source; heating a fuel vapor canister based on a fuel tank vacuum; and opening a fuel tank isolation valve to draw heated vapors into a fuel tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for a plug-in hybrid electric vehicle, comprising:
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a fuel vapor canister coupled to a fuel tank via a fuel tank isolation valve and further coupled to atmosphere via a canister vent valve; a fuel tank pressure sensor coupled to the fuel tank; a heating element coupled to the fuel vapor canister; and a control system including executable instructions stored in non-transitory memory for; during a first condition, including an engine-off condition and the plug-in hybrid electric vehicle coupled to an external power source; heating the fuel vapor canister based on a fuel tank vacuum; opening the canister vent valve to draw atmosphere into the fuel vapor canister; and opening a fuel tank isolation valve to draw heated vapors into a fuel tank. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for a plug-in hybrid electric vehicle, comprising:
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during a first condition, including an engine-off condition, the plug-in hybrid electric vehicle coupled to an external power source, a fuel vapor canister load above a threshold, a fuel tank vacuum above a threshold, and a first ambient temperature below a threshold; heating a fuel vapor canister using power from the external power source;
thenopening a canister vent valve;
thenopening a fuel tank isolation valve. - View Dependent Claims (19, 20)
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Specification