Method for a hybrid vehicle
First Claim
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1. A method for a hybrid vehicle, comprising:
- responsive to a refueling event with an amount of residual fuel in a fuel tank higher than a threshold fill,during an engine-on mode, activating a fuel pump located within the fuel tank and delivering fuel to an engine coupled in the hybrid vehicle; and
during an engine-off mode, activating the fuel pump without delivering fuel to the engine, the activating the fuel pump responsive to each of a refueling event with the engine shut down to rest, a residual fuel level in the fuel tank higher than the threshold fill, and the hybrid vehicle shut down.
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Abstract
Methods and systems are provided for a fuel system in a hybrid vehicle. In one example, a method includes activating a fuel pump in a fuel tank included in the hybrid vehicle responsive to a refueling event with a level of residual fuel higher than a fill threshold. By activating the fuel pump, residual fuel in the fuel tank is mixed with newly received fuel in the refueling event enabling improved combustion in a subsequent engine-on condition.
25 Citations
20 Claims
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1. A method for a hybrid vehicle, comprising:
responsive to a refueling event with an amount of residual fuel in a fuel tank higher than a threshold fill, during an engine-on mode, activating a fuel pump located within the fuel tank and delivering fuel to an engine coupled in the hybrid vehicle; and during an engine-off mode, activating the fuel pump without delivering fuel to the engine, the activating the fuel pump responsive to each of a refueling event with the engine shut down to rest, a residual fuel level in the fuel tank higher than the threshold fill, and the hybrid vehicle shut down. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for a hybrid vehicle, comprising:
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during a first condition, activating a fuel pump and delivering fuel to an engine of the hybrid vehicle, the fuel pump operating at a speed based on engine operating conditions; and during a second condition, activating the fuel pump without delivering fuel to the engine, the fuel pump operating at a speed based on ambient conditions, battery state of charge, and fuel conditions, wherein the second condition includes each of a refueling event with the engine shut down to rest, a residual fuel level in a fuel tank higher than a threshold, and the hybrid vehicle shut down. - View Dependent Claims (11, 12, 13, 14)
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15. A system for a hybrid vehicle, comprising:
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an engine; a fuel tank including a fuel level sensor; a fuel pump coupled to the fuel tank, the fuel pump being electrically actuated; a refueling lock; and a controller configured with instructions stored in non-transitory memory and executable by a processor for; in response to a refueling event with an amount of residual fuel fill in the fuel tank being higher than a threshold, activating the fuel pump in the fuel tank for a duration responsive to each of a refueling event with the engine shut down to rest, a residual fuel level in the fuel tank higher than a threshold, and the hybrid vehicle shut down; mixing residual fuel with newly received fuel in the fuel tank; and adjusting a fuel injection amount based on a composition of mixed fuel in the fuel tank during subsequent engine operation. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification