US20070131481A1 - Method and apparatus for attenuating sound in a vehicle exhaust system - Google Patents
Method and apparatus for attenuating sound in a vehicle exhaust system Download PDFInfo
- Publication number
- US20070131481A1 US20070131481A1 US11/301,208 US30120805A US2007131481A1 US 20070131481 A1 US20070131481 A1 US 20070131481A1 US 30120805 A US30120805 A US 30120805A US 2007131481 A1 US2007131481 A1 US 2007131481A1
- Authority
- US
- United States
- Prior art keywords
- holes
- resonator
- exhaust gases
- fluid passages
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/16—Selection of particular materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/02—Tubes being perforated
- F01N2470/04—Tubes being perforated characterised by shape, disposition or dimensions of apertures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/06—Tubes being formed by assembly of stamped or otherwise deformed sheet-metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/12—Tubes being corrugated
Definitions
- the present invention relates to exhaust systems for motor vehicles and more particularly to a method and apparatus for attenuating sound in a vehicle exhaust system.
- exhaust systems in motor vehicles have one or more resonators for attenuating the sound of emitted gases. While resonators in present use have achieved some degree of success, there is a need for improvement particularly at average or usual driving speeds in a range of 30-45 miles per hour, where the decibel level, and spikes in the decibel level, are not desirable.
- a resonator is provided through which exhaust gases are passed.
- the resonator breaks up and tunes sound waves in the exhaust gases.
- the resonator comprises a resonator body including at least one composite strip having a center foil which is corrugated to provide alternate ridges and grooves, and two perforated foils.
- the corrugated center foil is sandwiched between the two perforated foils to provide a multiplicity of parallel fluid passages between the corrugated foil and the perforated foils.
- the composite strip is tightly wound about a central axis parallel to the fluid passages.
- a housing encloses the resonator body and has an inlet at one end for admitting the exhaust gases and an outlet at an opposite end for the discharge of the exhaust gases.
- the resonator body preferably includes two additional composite strips, all of the same construction.
- an exhaust line having a first tube section transmitting the exhaust gases from the engine to a catalytic converter.
- the exhaust line has a second tube section transmitting the exhaust gases from the catalytic converter to the resonator.
- the exhaust line has a third tube section transmitting the exhaust gases from the resonator to a muffler.
- a second resonator is provided for receiving exhaust gases from the muffler. This second resonator may be of a more or less conventional design and is provided to reduce the level of sound to a lower decibel rating.
- FIG. 1 is an elevational view showing an exhaust system of an automotive vehicle, the exhaust system having a catalytic converter, a muffler and two resonators;
- FIG. 2 is a side elevational view of one of the resonators, with parts broken away;
- FIG. 3 is a sectional view taken on the line 3 — 3 in FIG. 2 ;
- FIG. 4 is a fragmentary perspective view of a composite strip which forms part of the resonator shown in FIG. 2 ;
- FIG. 5 is a fragmentary elevational view of one of the foils of the composite strip in FIG. 4 , showing the foil laid flat;
- FIG. 6 is a diagram illustrating the sound attenuation achieved by the resonator shown in FIG. 2 .
- an exhaust system 10 of an automotive vehicle 12 The vehicle 12 is powered by an engine 14 .
- Exhaust gases from the engine 14 are piped to an exhaust gas manifold 16 .
- the exhaust gases from the manifold 16 are transmitted to a catalytic converter 18 by a tube section 20 in an exhaust line 22 of the exhaust system 10 .
- a tube section 24 transmits the exhaust gases from the catalytic converter 18 to a resonator 26 .
- a tube section 28 transmits the exhaust gases from the resonator 26 to a muffler 30 .
- a tube section 32 transmits the exhaust gases from the muffler 30 to a second resonator 34 .
- a tube section 36 from the second resonator 34 discharges the exhaust gases to the atmosphere.
- the resonator 26 comprises at least one and preferably three elongated composite strips 40 , 42 and 44 .
- the composite strips are identical in construction and each comprises a center foil 46 which is corrugated to provide alternate ridges 48 and grooves 50 extending at right angles to the lengthwise dimension of the corrugated foil 46 .
- the corrugated foil 46 is sandwiched between and secured to two flat foils 52 and 54 to provide a multiplicity of parallel transverse fluid passages 56 between the corrugated foil 46 and the flat foils 52 and 54 .
- Each of the flat foils 52 and 54 is perforated by a plurality of circular holes 58 .
- Each of the composite strips 40 , 42 and 44 is folded and doubled back on itself about a transverse fold line at the midpoint in its length and is tightly and spirally wound about a central axis 60 that extends parallel to the fluid passages 56 .
- the fold lines are indicated respectively at 62 , 64 and 66 .
- the three composite strips overlay one another in a parallel relationship and are wound in the same direction about the central axis 60 , staggered from starting points which are equally spaced apart 120°, to provide a tightly and spirally wrapped resonator body or substrate 68 .
- the foils 46 , 52 and 54 are each made of stainless steel and are about 0.065 millimeters in thickness.
- the holes 58 are about 8 millimeters in diameter and are arranged in staggered rows which are parallel to the lengthwise dimension of the foils 52 and 54 . Each hole is spaced from the nearest adjacent holes by a distance of about 2 millimeters.
- the resonator body 68 extends lengthwise within a tubular housing 70 .
- the housing 70 has an inlet 72 at one end for admitting exhaust gases from the tube section 24 .
- the exhaust gases pass through the fluid passages 56 and exit from the housing through the outlet 74 at the opposite end of the housing. From the outlet 74 , the exhaust gases flow into the tube section 28 which transmits the exhaust gases to the muffler 30 .
- the resonator 34 may be of conventional construction having a perforated tube 76 passing through a housing 78 filled with a glass fiber insulation 80 or other suitable insulating material.
- the resonator 26 breaks up the sound waves of exhaust gases passing through the passages 56 thereof.
- FIG. 6 illustrates a sound wave 82 for gases passing through the exhaust system 10 that has the resonator 26 , and also a sound wave 84 for gases passing through an exhaust system which has a conventional resonator in place of the resonator 26 , such, for example, as one like the resonator 34 .
- sound wave 82 at the usual engine speeds between 2000 and 3000 RPM (approximately 30 to 45 miles per hour of vehicle speed) for the exhaust system 10 of this invention having the resonator 26 is considerably flattened or smoothed when compared with the sound wave 84 in an exhaust system having a conventional resonator in place of the resonator 26 .
- An exemplary resonator body or substrate 68 of the type used in this invention as shown in FIGS. 2 and 3 is sold by Emitec Company to be used for cleaning emissions by adding a layer of precious metal to the foils by a suitable washcoat paint.
- the substrate without a layer of precious metal, is used as a resonator to break up the standing wave coming from the engine.
Abstract
Description
- The present invention relates to exhaust systems for motor vehicles and more particularly to a method and apparatus for attenuating sound in a vehicle exhaust system.
- Typically, exhaust systems in motor vehicles have one or more resonators for attenuating the sound of emitted gases. While resonators in present use have achieved some degree of success, there is a need for improvement particularly at average or usual driving speeds in a range of 30-45 miles per hour, where the decibel level, and spikes in the decibel level, are not desirable.
- In accordance with this invention, a resonator is provided through which exhaust gases are passed. The resonator breaks up and tunes sound waves in the exhaust gases. The resonator comprises a resonator body including at least one composite strip having a center foil which is corrugated to provide alternate ridges and grooves, and two perforated foils. The corrugated center foil is sandwiched between the two perforated foils to provide a multiplicity of parallel fluid passages between the corrugated foil and the perforated foils. The composite strip is tightly wound about a central axis parallel to the fluid passages. A housing encloses the resonator body and has an inlet at one end for admitting the exhaust gases and an outlet at an opposite end for the discharge of the exhaust gases. The resonator body preferably includes two additional composite strips, all of the same construction.
- In a preferred embodiment of the invention, an exhaust line is provided having a first tube section transmitting the exhaust gases from the engine to a catalytic converter. The exhaust line has a second tube section transmitting the exhaust gases from the catalytic converter to the resonator. The exhaust line has a third tube section transmitting the exhaust gases from the resonator to a muffler. Further in accordance with this embodiment, a second resonator is provided for receiving exhaust gases from the muffler. This second resonator may be of a more or less conventional design and is provided to reduce the level of sound to a lower decibel rating.
- Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
- The present invention will become more fully understood from the detailed description and accompanying drawings, wherein:
-
FIG. 1 is an elevational view showing an exhaust system of an automotive vehicle, the exhaust system having a catalytic converter, a muffler and two resonators; -
FIG. 2 is a side elevational view of one of the resonators, with parts broken away; -
FIG. 3 is a sectional view taken on the line 3—3 inFIG. 2 ; -
FIG. 4 is a fragmentary perspective view of a composite strip which forms part of the resonator shown inFIG. 2 ; -
FIG. 5 is a fragmentary elevational view of one of the foils of the composite strip inFIG. 4 , showing the foil laid flat; and -
FIG. 6 is a diagram illustrating the sound attenuation achieved by the resonator shown inFIG. 2 . - The following description of the preferred embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
- Referring now more particularly to the drawings, there is shown an
exhaust system 10 of anautomotive vehicle 12. Thevehicle 12 is powered by anengine 14. Exhaust gases from theengine 14 are piped to anexhaust gas manifold 16. The exhaust gases from themanifold 16 are transmitted to acatalytic converter 18 by atube section 20 in an exhaust line 22 of theexhaust system 10. - A
tube section 24 transmits the exhaust gases from thecatalytic converter 18 to aresonator 26. - A
tube section 28 transmits the exhaust gases from theresonator 26 to amuffler 30. - A
tube section 32 transmits the exhaust gases from themuffler 30 to asecond resonator 34. - A
tube section 36 from thesecond resonator 34 discharges the exhaust gases to the atmosphere. - The
resonator 26 comprises at least one and preferably threeelongated composite strips center foil 46 which is corrugated to providealternate ridges 48 andgrooves 50 extending at right angles to the lengthwise dimension of thecorrugated foil 46. Thecorrugated foil 46 is sandwiched between and secured to twoflat foils transverse fluid passages 56 between thecorrugated foil 46 and theflat foils flat foils circular holes 58. - Each of the
composite strips central axis 60 that extends parallel to thefluid passages 56. The fold lines are indicated respectively at 62, 64 and 66. As seen inFIGS. 3 and 4 , the three composite strips overlay one another in a parallel relationship and are wound in the same direction about thecentral axis 60, staggered from starting points which are equally spaced apart 120°, to provide a tightly and spirally wrapped resonator body orsubstrate 68. - Preferably the
foils holes 58 are about 8 millimeters in diameter and are arranged in staggered rows which are parallel to the lengthwise dimension of thefoils - The
resonator body 68 extends lengthwise within atubular housing 70. Thehousing 70 has aninlet 72 at one end for admitting exhaust gases from thetube section 24. The exhaust gases pass through thefluid passages 56 and exit from the housing through theoutlet 74 at the opposite end of the housing. From theoutlet 74, the exhaust gases flow into thetube section 28 which transmits the exhaust gases to themuffler 30. - The
resonator 34 may be of conventional construction having a perforatedtube 76 passing through ahousing 78 filled with aglass fiber insulation 80 or other suitable insulating material. - The
resonator 26 breaks up the sound waves of exhaust gases passing through thepassages 56 thereof.FIG. 6 illustrates asound wave 82 for gases passing through theexhaust system 10 that has theresonator 26, and also asound wave 84 for gases passing through an exhaust system which has a conventional resonator in place of theresonator 26, such, for example, as one like theresonator 34. As can readily be seen,sound wave 82 at the usual engine speeds between 2000 and 3000 RPM (approximately 30 to 45 miles per hour of vehicle speed) for theexhaust system 10 of this invention having theresonator 26 is considerably flattened or smoothed when compared with thesound wave 84 in an exhaust system having a conventional resonator in place of theresonator 26. Note the sudden spike in the decibel rating for thesound wave 84, indicated at 86, in the usual engine speed range. Even outside the usual engine speed range, thesound wave 82 is noticeably smoothed by theresonator 26. - An exemplary resonator body or
substrate 68 of the type used in this invention as shown inFIGS. 2 and 3 is sold by Emitec Company to be used for cleaning emissions by adding a layer of precious metal to the foils by a suitable washcoat paint. According to this invention, the substrate, without a layer of precious metal, is used as a resonator to break up the standing wave coming from the engine. - The description of the invention is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/301,208 US20070131481A1 (en) | 2005-12-12 | 2005-12-12 | Method and apparatus for attenuating sound in a vehicle exhaust system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/301,208 US20070131481A1 (en) | 2005-12-12 | 2005-12-12 | Method and apparatus for attenuating sound in a vehicle exhaust system |
Publications (1)
Publication Number | Publication Date |
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US20070131481A1 true US20070131481A1 (en) | 2007-06-14 |
Family
ID=38138154
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/301,208 Abandoned US20070131481A1 (en) | 2005-12-12 | 2005-12-12 | Method and apparatus for attenuating sound in a vehicle exhaust system |
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Citations (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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US20050170957A1 (en) * | 2002-08-16 | 2005-08-04 | Emitec Gesellschaft Fur Emissionstechnologie Mbh | Metallic honeycomb body having at least partially perforated sheet-metal layers |
US7083860B2 (en) * | 2002-08-16 | 2006-08-01 | Emitec Gesellschaft Fuer Emissionstechnologie Mbh | Metallic honeycomb body having at least partially perforated sheet-metal layers |
US20070009400A1 (en) * | 2003-04-17 | 2007-01-11 | Aulis Vakkilainen | Porous sheet and substrate having porous sheet(s) for treating exhaust gases of combustion engines |
US20060096282A1 (en) * | 2003-05-10 | 2006-05-11 | Gerhard Friedrich | Method and apparatus for purifying exhaust gases |
US20050198947A1 (en) * | 2004-03-12 | 2005-09-15 | George Konstantakopoulos | Exhaust system catalyst assembly for a dual crankshaft engine |
US20060008399A1 (en) * | 2004-07-07 | 2006-01-12 | Feinstein Jonathan J | Reactor with primary and secondary channels |
US20070144828A1 (en) * | 2005-12-22 | 2007-06-28 | Galligan Michael P | Inlet metallic foam support coupled to precious metal catalyst for application on 4 stroke platforms |
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