Apparatus, system and method of establishing a test threshold for a fuel vapor leak detection system
First Claim
1. An apparatus establishing a threshold for a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the apparatus 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 the seal is in a first deformed configuration; and
a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and
a processor coupled to the sensor, the processor indicates the presence of a fault in the fuel system based on an evaluation of multiple failures by the sensor to detect the first arrangement.
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Accused Products
Abstract
An apparatus, system and method of establishing a threshold for a leak detection test that is performed on a headspace of a fuel system. A fuel vapor pressure management apparatus includes a housing, a pressure operable device, and a sensor. The housing defines an interior chamber. The pressure operable device separates the interior chamber into first and second portions, and includes a poppet that moves along an axis and a seal that is adapted to cooperatively engage the poppet. A first arrangement of the pressure operable device occurs during the leak detection test when the seal is in a first deformed configuration. A sensor detects the first arrangement of the pressure operable device during the leak detection test. And a processor is coupled to the sensor and reduces sensitivity of the fuel vapor pressure management apparatus during the leak detection test.
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Citations
12 Claims
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1. An apparatus establishing a threshold for a leak detection test performed on a headspace of a fuel system supplying fuel to an internal combustion engine of a vehicle, the apparatus 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 the seal is in a first deformed configuration; and a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and a processor coupled to the sensor, the processor indicates the presence of a fault in the fuel system based on an evaluation of multiple failures by the sensor to detect the first arrangement. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A system for performing a leak detection test, the system comprising:
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an internal combustion engine; a fuel system supplying fuel to the internal combustion engine, the fuel system including a fuel tank and a headspace within the fuel tank; 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 the seal is in a first deformed configuration; and a sensor detecting the first arrangement of the pressure operable device during the leak detection test; and a processor coupled to the sensor, the processor indicating the presence of a fault in the fuel system based on an evaluation of multiple failures by the sensor to detect the first arrangement. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification