Method for controlling a pressure inside a fuel tank system
First Claim
1. A method for controlling a pressure inside a fuel tank system on board a vehicle, the fuel tank system comprising a fuel tank, a canister, and a venting circuit having at least one controllable pressure relief valve, the vehicle comprising a source of energy adapted to activate said at least one pressure relief valve, located between the canister and the tank, and so as to move it from a closed position to a pressure relief position, wherein the method comprises:
- detecting a key off event indicative of the vehicle shut-down;
determining an amount of energy available at the source of energy;
starting at least one pressure relief operation comprising;
verifying whether the amount of energy available is lower than a first predetermined threshold amount; and
, if said verifying is positive, activating said at least one pressure relief valve from a closed position to an open position such that the tank is depressurized, andterminating said at least one pressure relief operation.
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Accused Products
Abstract
A method for controlling a pressure inside a fuel tank system on board a vehicle, the fuel tank system having a fuel tank and a venting circuit having at least one controllable pressure relief valve, the vehicle having a source of energy adapted to activate said at least one pressure relief valve so as to move it from a closed position to a pressure relief position. The method entails: detecting a key off event indicative of the vehicle shut-down; determining an amount of energy available at the source of energy; starting at least one pressure relief operation by verifying whether the amount of energy available is lower than a first predetermined threshold amount and, if the verification is positive, activating the at least one pressure relief valve; and terminating the at least one pressure relief operation.
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Citations
11 Claims
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1. A method for controlling a pressure inside a fuel tank system on board a vehicle, the fuel tank system comprising a fuel tank, a canister, and a venting circuit having at least one controllable pressure relief valve, the vehicle comprising a source of energy adapted to activate said at least one pressure relief valve, located between the canister and the tank, and so as to move it from a closed position to a pressure relief position, wherein the method comprises:
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detecting a key off event indicative of the vehicle shut-down; determining an amount of energy available at the source of energy; starting at least one pressure relief operation comprising; verifying whether the amount of energy available is lower than a first predetermined threshold amount; and
, if said verifying is positive, activating said at least one pressure relief valve from a closed position to an open position such that the tank is depressurized, andterminating said at least one pressure relief operation. - View Dependent Claims (2, 3, 4, 5)
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6. A method for controlling a pressure inside a fuel tank system on board a vehicle, the fuel tank system comprising a fuel tank, a canister, and a venting circuit having at least one controllable pressure relief valve, the vehicle comprising a battery forming a source of energy adapted to activate said at least one pressure relief valve, located between the canister and the tank, and so as to move it from a closed position to a pressure relief position, wherein the method comprises:
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detecting a key off event indicative of the vehicle shut-down; determining a voltage available at the vehicle battery; starting at least one pressure relief operation comprising; verifying whether the voltage available at the vehicle battery is lower than a first predetermined threshold amount; and
, if said verifying is positive, activating said at least one pressure relief valve from a closed position to an open position such that the tank is depressurized,terminating said at least one pressure relief operation. - View Dependent Claims (7)
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8. A fuel tank system mountable on a vehicle, comprising:
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a fuel tank; a canister; a venting circuit having at least one controllable pressure relief valve, wherein said at least one controllable pressure relief valve is located between the canister and the tank; and an electronic controller configured to; detect a key off event indicative of the vehicle shut-down; determine an amount of energy available at a source of energy on board the vehicle; start at least one pressure relief operation and activate said at least one pressure relief valve from a closed position to an open position such that the tank is depressurized, when the amount of energy available is lower than a first predetermined threshold amount; and terminate said at least one pressure relief operation. - View Dependent Claims (9, 10)
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11. A fuel tank system mountable on a vehicle, comprising:
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a fuel tank; a canister; a venting circuit having at least one controllable pressure relief valve, wherein said at least one controllable pressure relief valve is located between the canister and the tank; and an electronic controller configured to; detect a key off event indicative of the vehicle shut-down; determine a voltage available at a vehicle battery on board the vehicle; start at least one pressure relief operation and activate said at least one pressure relief valve from a closed position to an open position such that the tank is depressurized, when the voltage available at the vehicle battery is lower than a first predetermined threshold amount; and terminate said at least one pressure relief operation.
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Specification