Rationality testing for a fuel vapor pressure management apparatus
First Claim
1. A method of rationalizing the functioning of a fuel vapor pressure management system that is in fluid communication with a headspace of a fuel system, the fuel system supplying fuel to an internal combustion engine of a vehicle, the method comprising:
- providing a fuel vapor pressure management apparatus detecting an absence of leaks with respect to the headspace;
counting a number of leak detection tests performed by the fuel vapor pressure management apparatus;
counting a number of occurrences of the fuel vapor pressure management apparatus detecting an absence of a leak; and
evaluating the number of occurrences within a selected number of tests.
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Accused Products
Abstract
A method of rationalizing the functioning of a fuel vapor pressure management system. The fuel vapor pressure management system is in fluid communication with a headspace of a fuel system, and the fuel system supplies fuel to an internal combustion engine of a vehicle. The method includes providing a fuel vapor pressure management apparatus detecting an absence of leaks with respect to the headspace, counting a number of leak detection tests performed by the fuel vapor pressure management apparatus, counting a number of occurrences of the fuel vapor pressure management apparatus detecting an absence of a leak, and evaluating the number of occurrences within a selected number of tests.
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Citations
10 Claims
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1. A method of rationalizing the functioning of a fuel vapor pressure management system that is in fluid communication with a headspace of a fuel system, the fuel system supplying fuel to an internal combustion engine of a vehicle, the method comprising:
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providing a fuel vapor pressure management apparatus detecting an absence of leaks with respect to the headspace; counting a number of leak detection tests performed by the fuel vapor pressure management apparatus; counting a number of occurrences of the fuel vapor pressure management apparatus detecting an absence of a leak; and evaluating the number of occurrences within a selected number of tests. - View Dependent Claims (9, 10)
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2. A method of rationalizing the functioning of a fuel vapor pressure management system that is in fluid communication with a headspace of a fuel system, the fuel system supplying fuel to an internal combustion engine of a vehicle, the method comprising:
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providing a fuel vapor pressure management apparatus detecting an absence of leaks with respect to the headspace, the 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; counting a number of leak detection tests performed by the fuel vapor pressure management apparatus; counting a number of occurrences of the fuel vapor pressure management apparatus detecting an absence of a leak; and evaluating the number of occurrences within a selected number of tests.
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3. A method of rationalizing the functioning of a fuel vapor pressure management system that is in fluid communication with a headspace of a fuel system, the fuel system supplying fuel to an internal combustion engine of a vehicle, the method comprising:
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providing a fuel vapor pressure management apparatus detecting an absence of leaks with respect to the headspace; counting a number of leak detection tests performed by the fuel vapor pressure management apparatus; counting a number of occurrences of the fuel vapor pressure management apparatus detecting an absence of a leak; and evaluating the number of occurrences within a selected number of tests, the evaluating including determining a statistical average of engine operating events when an absence of the leak occurs. - View Dependent Claims (4, 5, 6, 7, 8)
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Specification