Multi-frequency quarter-wave resonator for an internal combustion engine
First Claim
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1. A method of selectively attenuating noise in a vehicle, comprising:
- selectively retracting a wire connected to a valve body disposed within a hollow tube to move the valve body axially within the tube into sealed engagement with a valve seat within the tube to define a tube effective length that is less than an overall length of the tube to selectively vary the effective length of the tube in response to an engine operating parameter.
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Abstract
A variable noise attenuation element is disclosed that comprises a tube, at least one valve seat, at least one valve body and a wire connected to the valve body. The tube has an overall length that defines a first effective length for noise attenuation. The valve seat is disposed in the tube. Retraction of the wire brings the valve body into engagement with the valve seat to selectively define a second effective length of the tube that is less than the overall length.
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Citations
13 Claims
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1. A method of selectively attenuating noise in a vehicle, comprising:
selectively retracting a wire connected to a valve body disposed within a hollow tube to move the valve body axially within the tube into sealed engagement with a valve seat within the tube to define a tube effective length that is less than an overall length of the tube to selectively vary the effective length of the tube in response to an engine operating parameter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of attenuating vehicle noise, comprising:
selectively moving a valve body within a hollow tube having a closed sidewall into sealed engagement with a valve seat located a predetermined position within the tube to define a tube effective length that is less than an overall length of the tube to selectively vary the effective length of the tube in response to an engine operating parameter. - View Dependent Claims (8)
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9. A noise attenuation element for vehicles, comprising:
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a tube having a closed sidewall and closed end, the tube defining an overall length; a valve seat disposed in the tube; and a valve body; wherein the valve body is configured to move axially within the tube into sealed engagement with the valve seat defining a tube effective length that is less than the overall length. - View Dependent Claims (10, 11)
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12. A method of selectively attenuating noise in a vehicle, comprising:
selectively retracting a wire connected to a valve body disposed within a hollow tube to move the valve body axially within the tube into sealed engagement with a valve seat within the tube to define a tube effective length that is less than an overall length of the tube to selectively vary the effective length of the tube in response to an engine operating parameter; and
continuing to retract the wire to move a second valve body axially within the tube into sealed engagement with a second valve seat within the tube to define a second tube effective length that is less than the tube effective length.- View Dependent Claims (13)
Specification