Device and method for a sound-attenuating unit
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United States of America Patent
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May 20, 2003
Issued Date -
N/A
app pub date -
May 13, 2000
filing date -
Nov 14, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for a sound-absorbing unit for reduction of sounds from a flowing gas stream, including a first flow path and a second flow path for said gas stream and a switch-over device for alternating guiding of the gas stream along the first flow path and the second flow path, respectively. A detection device for detection of the pressure of said gas stream, and that the switch-over device comprises an adjustable throttle for blocking of the first flow path when a pressure which is below a predetermined limit value is detected, wherein the gas stream is guided through said second flow path, and that the throttle is adapted to be opened if said limit value is exceeded, wherein the gas stream is guided along said first flow path. By means of the invention, an improved adjustable device is provided for mufflers for vehicles, said device providing an effective sound absorption, a small mounting volume and a low back pressure during high engine speeds.
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