Interference-based exhaust noise attenuation
First Claim
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:
- at least three paths including at least a direct path for the exhaust flow and at least two looped paths for the exhaust flow, with volumes of the direct path and the looped paths differing by an amount that results in a staggered rearrangement of the compressive waves in the paths, and with the looped paths looping on opposite sides of the direct path from each other;
a splitter that splits the exhaust flow into at least the three paths; and
a merger that merges the exhaust flow from at least the three paths;
wherein when the exhaust flow from the direct path and the looped paths 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 paths.
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Abstract
An interference-based exhaust noise attenuation device and method for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow. The device includes at least 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. When the exhaust flow from the direct path and the looped path are merged, at least some noise cancellation occurs. In other embodiments, plural direct paths, looped paths, splitters, and/or mergers can be used in various combinations.
47 Citations
20 Claims
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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:
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at least three paths including at least a direct path for the exhaust flow and at least two looped paths for the exhaust flow, with volumes of the direct path and the looped paths differing by an amount that results in a staggered rearrangement of the compressive waves in the paths, and with the looped paths looping on opposite sides of the direct path from each other; a splitter that splits the exhaust flow into at least the three paths; and a merger that merges the exhaust flow from at least the three paths; wherein when the exhaust flow from the direct path and the looped paths 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 paths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An interference-based exhaust noise attenuation device for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow, comprising:
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at least three paths including one or more direct paths for the exhaust flow and two or more looped paths for the exhaust flow, with volumes of the direct paths and the looped paths differing by amounts that result in staggered rearrangements of the compressive waves in the paths, and with the looped paths looping on opposite sides of the direct path from each other; one or more splitters that splits the exhaust flow into at least the three paths; and one or more mergers that merge the exhaust flow from at least the three paths; wherein when the exhaust flow from the direct paths and the looped paths are merged, at least some noise cancellation occurs due to the staggered rearrangements caused by the differing volumes between the direct paths and the looped paths; and wherein the splitters and the mergers are connected directly together to form the direct paths.
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11. A method of interference-based exhaust noise attenuation for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow, comprising:
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splitting the exhaust flow into at least three paths including at least a direct path and at least two looped paths with a splitter, with volumes of the direct path and the looped paths differing by an amount that results in a staggered rearrangement of the compressive waves in the paths, and with the looped paths looping on opposite sides of the direct path from each other; and merging the exhaust flow from at least the three paths with a merger; wherein when the exhaust flow from the direct path and the looped paths 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 paths; and wherein the splitter and the merger are connected directly together to form the direct path. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of interference-based exhaust noise attenuation for exhaust flow from an internal combustion engine that generates compressive waves in the exhaust flow, comprising:
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splitting the exhaust flow into at least three paths including one or more direct paths and two or more looped paths with one or more splitters, with volumes of the direct paths and the looped paths differing by amounts that results in staggered rearrangements of the compressive waves in the paths, and with the looped paths looping on opposite sides of the direct path from each other; and merging the exhaust flow from at least the three paths with one or more mergers; wherein when the exhaust flow from the direct paths and the looped paths are merged, at least some noise cancellation occurs due to the staggered rearrangements caused by the differing volumes between the direct paths and the looped paths; and wherein the splitters and the mergers are connected directly together to form the direct paths.
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Specification