Fuel system degradation test using two fuel tanks
First Claim
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1. A method for a vehicle, comprising:
- closing an isolation valve arranged in a first passage coupling a first fuel tank with a second fuel tank;
activating a jet pump arranged in a second passage coupling the first fuel tank with the second fuel tank to evacuate fuel from the first fuel tank to the second fuel tank; and
indicating fuel system degradation responsive to a change in fuel system pressure following the evacuation of fuel.
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Abstract
Embodiments for monitoring fuel system degradation are provided. In one example, a method for a vehicle comprises evacuating fuel from a first fuel tank to a second fuel tank, and indicating fuel system degradation in response to a change in fuel system pressure following the evacuation of fuel. In this way, fuel system degradation may be indicated without use of a separate pressure building device.
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Citations
19 Claims
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1. A method for a vehicle, comprising:
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closing an isolation valve arranged in a first passage coupling a first fuel tank with a second fuel tank; activating a jet pump arranged in a second passage coupling the first fuel tank with the second fuel tank to evacuate fuel from the first fuel tank to the second fuel tank; and indicating fuel system degradation responsive to a change in fuel system pressure following the evacuation of fuel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for a vehicle having a fuel system, comprising:
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during an engine off condition, waking up a powertrain control module of the vehicle and activating a jet pump arranged in a passage coupling a first fuel tank with a second fuel tank to apply pressure to the fuel system by transferring fuel from the first fuel tank to the second fuel tank; and once a threshold pressure in the fuel system is reached, indicating fuel system degradation in response to a subsequent change in fuel system pressure. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A vehicle fuel system, comprising:
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a first fuel tank including a fuel pump arranged therein; a second fuel tank; an isolation valve arranged in a first passage coupling the first and second fuel tanks; a jet pump arranged in a second passage coupling the first and second fuel tanks; a fuel vapor canister coupled to the first fuel tank; and a controller including instructions to; close the isolation valve; activate the jet pump to transfer fuel from the first fuel tank to the second fuel tank to thereby manipulate a vapor space of the first fuel tank to apply pressure to the fuel system; and indicate a leak in the fuel system based on a change in pressure of the fuel system following the application of pressure. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification