Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Reexamination Certificate
2005-02-08
2005-02-08
Hepperle, Stephen M. (Department: 3753)
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
C123S519000, C137S014000, C137S493900, C137S514300
Reexamination Certificate
active
06851443
ABSTRACT:
A device and method for preventing resonance in a fuel vapor pressure management apparatus of a fuel system supplying 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, and performs excess positive pressure relief of the headspace. The device includes a housing defining an interior chamber, a pressure operable device separating the interior chamber into first and second portions, and a device preventing resonance. The pressure operable device includes a poppet that is movable along an axis and a seal that is adapted to cooperatively engage the poppet. The device preventing resonance includes at least one of a dashpot defined by the housing and the poppet, a gap between the poppet and the seal, and a resilient element applying a force biasing the poppet toward the seal. The dashpot damps movement of the poppet associated with the performing excess positive pressure relief. The gap modulates fluid flow that occurs between the surface and the tip during the performing excess negative pressure relief. And the force is applied eccentrically with respect to the axis so as to damp resonance due to movement of the poppet associated with the performing excess positive pressure relief.
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Perry Paul
Veinotte Andre
Hepperle Stephen M.
Siemens VDO Automotive Inc.
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