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Interference-based exhaust noise attenuation

  • US 20050279569A1
  • Filed: 06/22/2004
  • Published: 12/22/2005
  • Est. Priority Date: 06/22/2004
  • Status: Active Grant
First Claim
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1. An interference-based exhaust noise attenuation device for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow, comprising:

  • a direct path for the exhaust flow;

    a looped path for the exhaust flow, with volumes of the direct path and the looped path differing by an amount that results in a staggered rearrangement of the compressive waves in the paths;

    a splitter that splits the exhaust flow into the direct path and the looped path; and

    a merger that merges the exhaust flow from the direct path and the looped path;

    wherein when the exhaust flow from the direct path and the looped path are merged, at least some noise cancellation occurs due to the staggered rearrangement caused by the differing volumes between the direct path and the looped path.

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