Flow sensor integrated with leak detection for purge valve diagnostic
First Claim
1. A method of fuel vapor management for a fuel system of an internal combustion engine, comprising the steps of:
- when the engine is not running, performing a leak detection diagnostic including the steps of detecting a fuel vapor pressure and temperature using a pressure sensor and a temperature sensor, respectively, and determining, based upon the detected pressure and temperature, whether there is a leak in the fuel system; and
when the engine is running, performing a purge valve diagnostic including the steps of measuring a temperature using the temperature sensor and based on the measured temperature, diagnosing the performance of a purge valve.
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Accused Products
Abstract
An apparatus and a method for managing fuel vapor pressure in a fuel system that supplies fuel to an internal combustion engine. The fuel vapor pressure management apparatus performs leak detection on a headspace of the fuel system, performs excess negative pressure relief of the headspace, performs excess positive pressure relief of the headspace, and performs a diagnostic on the purge valve. The apparatus includes a housing, a pressure operable device, and a printed circuit board. The housing defines an interior chamber. The pressure operable device separates the interior chamber into first and second portions. And the pressure operable device includes a poppet that moves along an axis and a seal that is adapted to cooperatively engage the poppet. The printed circuit board is supported by the housing in the interior chamber. And the printed circuit board includes a first sensor that is adapted to be actuated by movement of the poppet along the axis and a second sensor that measures a flow rate within the housing.
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Citations
36 Claims
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1. A method of fuel vapor management for a fuel system of an internal combustion engine, comprising the steps of:
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when the engine is not running, performing a leak detection diagnostic including the steps of detecting a fuel vapor pressure and temperature using a pressure sensor and a temperature sensor, respectively, and determining, based upon the detected pressure and temperature, whether there is a leak in the fuel system; and
when the engine is running, performing a purge valve diagnostic including the steps of measuring a temperature using the temperature sensor and based on the measured temperature, diagnosing the performance of a purge valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A fuel vapor management apparatus for a fuel system of an internal combustion engine, comprising:
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a first sensor configured to detect a change in pressure; and
a second sensor including a first temperature measuring configuration and a second temperature measuring configuration. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification