In-use rate based calculation for a fuel vapor pressure management apparatus
First Claim
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1. A system of evaluating a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the system comprising:
- a fuel vapor pressure management apparatus including;
a housing defining an interior chamber;
a pressure operable device separating the interior chamber into first and second portions, the pressure operable device including a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, a first arrangement of the pressure operable device occurs during the leak detection test when there is a first negative pressure level in the first portion relative to the second portion and the seal is in a first deformed configuration, a second arrangement of the pressure operable device permits a first fluid flow from the second portion to the first portion when the seal is in a second deformed configuration, and a third arrangement of the pressure operable device permits a second fluid flow from the first portion to the second portion when the seal is in an undeformed configuration; and
a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and
a processor that (1) calculates an in-use rate value by dividing a number of monitoring events by a number of driving events of the vehicle, the number of monitoring events being based on the sensor detecting the first arrangement; and
(2) compares the in-use rate value to a standard value.
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Abstract
A system and method of evaluating a leak detection test that is performed on a headspace of a fuel system. The system includes a fuel vapor pressure management apparatus, an algorithm that calculates an in-use rate value by dividing a number of monitoring events by a number of driving events of the vehicle, and a computer that compares the in-use rate value to a standard value.
35 Citations
18 Claims
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1. A system of evaluating a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the system comprising:
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a fuel vapor pressure management apparatus including; a housing defining an interior chamber; a pressure operable device separating the interior chamber into first and second portions, the pressure operable device including a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, a first arrangement of the pressure operable device occurs during the leak detection test when there is a first negative pressure level in the first portion relative to the second portion and the seal is in a first deformed configuration, a second arrangement of the pressure operable device permits a first fluid flow from the second portion to the first portion when the seal is in a second deformed configuration, and a third arrangement of the pressure operable device permits a second fluid flow from the first portion to the second portion when the seal is in an undeformed configuration; and a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and a processor that (1) calculates an in-use rate value by dividing a number of monitoring events by a number of driving events of the vehicle, the number of monitoring events being based on the sensor detecting the first arrangement; and
(2) compares the in-use rate value to a standard value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of evaluating a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the system comprising:
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performing the leak detection test with a fuel vapor pressure management apparatus including; a housing defining an interior chamber; a pressure operable device separating the interior chamber into first and second portions, the pressure operable device including a poppet movable along an axis and a seal adapted to cooperatively engage the poppet, a first arrangement of the pressure operable device occurs during the leak detection test when there is a first negative pressure level in the first portion relative to the second portion and the seal is in a first deformed configuration, a second arrangement of the pressure operable device permits a first fluid flow from the second portion to the first portion when the seal is in a second deformed configuration, and a third arrangement of the pressure operable device permits a second fluid flow from the first portion to the second portion when the seal is in an undeformed configuration; and a sensor detecting the first arrangement of the pressure operable device during the leak detection test; calculating an in-use rate equal to a number of monitoring events divided by a number of driving events; and comparing the calculated in-use rate to a standard value. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification