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Multi-frequency quarter-wave resonator for an internal combustion engine

  • US 9,726,125 B2
  • Filed: 06/10/2016
  • Issued: 08/08/2017
  • Est. Priority Date: 06/11/2014
  • Status: Expired due to Fees
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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