US20080041043A1 - Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices - Google Patents
Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices Download PDFInfo
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- US20080041043A1 US20080041043A1 US11/504,904 US50490406A US2008041043A1 US 20080041043 A1 US20080041043 A1 US 20080041043A1 US 50490406 A US50490406 A US 50490406A US 2008041043 A1 US2008041043 A1 US 2008041043A1
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- wall
- cavity
- housing
- inlet
- end cone
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- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
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- 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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
- F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single housing
Abstract
Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices are provided. In one exemplary embodiment, the exhaust treatment device includes a housing and a catalyst disposed in the housing. The exhaust treatment device further includes a first end cone having a first inner wall and a first outer wall. The first outer wall is secured to the first inner wall at one end. The first outer wall is secured to the housing at another end. The first inner wall is spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween. The first inner wall is spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, wherein exhaust gases flowing through the inlet into the first cavity attenuate sound within the first end cone and the housing.
Description
- This application relates to exhaust treatment devices and methods for reducing sound using the exhaust treatment devices.
- Vehicles have utilized mufflers in exhaust systems to reduce sound generated by internal combustion engines. However, a muffler may not be able to reduce sounds at certain frequencies which can be undesirably heard by vehicle occupants.
- Accordingly, the inventors herein have recognized a need for an improved exhaust treatment device that can reduce noise generated in an exhaust system.
- An exhaust treatment device in accordance with an exemplary embodiment is provided. The exhaust treatment device includes a housing and a catalyst disposed in the housing. The exhaust treatment device further includes a first end cone having a first inner wall and a first outer wall. The first outer wall is secured to the first inner wall at one end. The first outer wall is secured to the housing at another end. The first inner wall is spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween. The first inner wall is spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, wherein exhaust gases flowing through the inlet into the first cavity attenuate sound within the first end cone and the housing.
- A method for reducing sound in an exhaust treatment device in accordance with another exemplary embodiment is provided. The exhaust treatment device has a housing, a first end cone, and a catalyst. The catalyst is disposed in the housing. The first end cone has a first inner wall and a first outer wall. The first outer wall is secured to the first inner wall at one end. The first outer wall is secured to the housing at another end. The first inner wall is spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween. The first inner wall is spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity. The method includes receiving exhaust gases in the first end cone such that a portion of the exhaust gases flow through the inlet into the first cavity of the first end cone. The method further includes attenuating sound within the first end cone and the housing utilizing the portion of the exhaust gases flowing through the inlet into the first cavity of the first end cone.
- An exhaust treatment device in accordance with another exemplary embodiment is provided. The exhaust treatment device includes a housing and a catalyst disposed in the housing. The exhaust treatment device further includes a first end cone having a first inner wall and a first outer wall. The first outer wall is secured to the first inner wall at one end. The first outer wall is secured to the housing at another end. The first inner wall is spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween. The first inner wall is spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity. The first inner wall has at least one aperture extending therethrough, wherein exhaust gases flowing through the inlet and the at least one aperture of the first inner wall into the first cavity attenuate sound within the first end cone and the housing.
- A method for reducing sound in an exhaust treatment device in accordance with another exemplary embodiment is provided. The exhaust treatment device has a housing, a first end cone, and a catalyst. The catalyst is disposed in the housing. The first end cone has a first inner wall and a first outer wall. The first outer wall is secured to the first inner wall at one end. The first outer wall is secured to the housing at another end. The first inner wall is spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween. The first inner wall is spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity. The first inner wall has at least one aperture extending therethrough. The method includes receiving exhaust gases in the first end cone such that a portion of the exhaust gases flow through the inlet into the first cavity of the first end cone and another portion of the exhaust gases flow through the at least one aperture of the first inner wall into the first cavity. The method further includes attenuating sound within the first end cone and the housing utilizing the portion of the exhaust gases flow through the inlet into the first cavity of the first end cone and the portion of the exhaust gases flowing through the at least one aperture of the first inner wall into the first cavity.
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FIG. 1 is a block diagram of an exemplary Helmholtz resonator; -
FIG. 2 is a sound attenuation curve associated with the Helmholtz resonator ofFIG. 1 ; -
FIG. 3 is a block diagram of another exemplary Helmholtz resonator; -
FIG. 4 is a sound attenuation curve associated with the Helmholtz resonator ofFIG. 3 ; -
FIG. 5 is a block diagram of another exemplary Helmholtz resonator; -
FIG. 6 is a sound attenuation curve associated with the Helmholtz resonator ofFIG. 5 ; -
FIG. 7 is a cross-sectional schematic of an exhaust treatment device having a Helmholtz resonator in accordance with an exemplary embodiment; -
FIG. 8 is a sound attenuation curve associated with a first end cone of the exhaust treatment device ofFIG. 7 ; -
FIG. 9 is a sound attenuation curve associated with another end cone, without a Helmholtz resonator, of a catalytic converter; -
FIG. 10 is a sound attenuation curve associated with a first end cone of the exhaust treatment device ofFIG. 7 obtained utilizing simulation software; -
FIG. 11 is a sound attenuation curve associated with a second end cone of the exhaust treatment device ofFIG. 7 obtained utilizing simulation software; -
FIG. 12 is a partial cross-sectional schematic of an exhaust treatment device having a Helmholtz resonator in accordance with another exemplary embodiment; and -
FIG. 13 is a partial cross-sectional schematic of an exhaust treatment device having a Helmholtz resonator in accordance with another exemplary embodiment. - Before describing the exhaust treatment devices in accordance with exemplary embodiments, a brief description of a Helmholtz resonators will be discussed. The sound attenuation characteristics of a Helmholtz resonator are determined based on a volume of a cavity, a total area of an inlet into the cavity, and a length of the inlet into the cavity. In particular, a center frequency where sound is attenuated by a Helmholtz resonator is predicted by using the following equation:
-
f=180/(Ao/Le V)1/2 - where
- f corresponds to the sound center frequency where a greatest sound attenuation is obtained;
- Ao corresponds to the total inlet area;
- Le corresponds to the effective length of the inlet which is obtained utilizing the following equation: Le=actual inlet length+end effect constant B; and
- V corresponds to the volume of a cavity coupled to the inlet.
Further, the amount of sound attenuation by a Helmholtz resonator is proportional to the following equation: -
[(Co V)1/2/2S ], wherein - Co corresponds to the inlet conductivity and is obtained utilizing the following equation: Co=Ao/Le; and
- S corresponds to the cross-sectional area of the inlet.
- Referring now to
FIGS. 1-6 , exemplary configurations of simple Helmholtz resonators are illustrated. In particular, the Helmholtz resonators will be utilized to illustrate how the three variables (i.e. a total inlet area, an inlet length, and a cavity volume) may be varied to select sound frequency ranges to attenuate. Referring toFIGS. 1 and 2 , a Helmholtz resonator 4 includes a cavity and an inlet. Theattenuation curve 5 indicates that the Helmholtz resonator 4 attenuates sound across a relatively large frequency range. Referring toFIGS. 3 and 4 , a Helmholtz resonator 6 includes a cavity and an inlet. Theattenuation curve 7 indicates that the Helmholtz resonator 6 attenuates sound across a frequency range smaller than the frequency range of the Helmholtz resonator 4. Referring toFIGS. 5 and 6 , a Helmholtz resonator 8 includes a cavity and an inlet. Theattenuation curve 7 indicates that the Helmholtz resonator 8 attenuates sound across a frequency range smaller than the frequency range of Helmholtz resonator 6. - Referring to
FIG. 7 , anexhaust treatment device 10 in accordance with an exemplary embodiment is illustrated. Theexhaust treatment device 10 is provided to reduce emissions from an internal combustion engine (not shown). Further, theexhaust treatment device 10 is provided to reduce sound within predetermined frequency ranges within theexhaust treatment device 10. Theexhaust treatment device 10 includes anend cone 12, ahousing 14, acatalyst 15, and anend cone 16. - The
end cone 12 is provided to direct exhaust gases into theexhaust treatment device 10. Theend cone 12 is further configured as a Helmholtz resonator to attenuate noise within a predetermined frequency range. Theend cone 12 includes aninner wall 30 and anouter wall 32. Theinner wall 30 and theouter wall 32 are constructed from stainless steel. Theinner wall 30 is coupled to theouter wall 32 at anend 34 and defines aflow path 33 therein. Theinner wall 30 is disposed in a spaced relationship with theouter wall 32 at anend 36, such that acavity 38 is defined between theinner wall 30 and theouter wall 32. Theouter wall 32 is further coupled at theend 36 to awall 50 of thehousing 14. Further, anannular inlet 40 is defined between theinner wall 30 and acatalyst 15 disposed within thehousing 14. Thus, theinlet 40 and thecavity 38 define a Helmholtz resonator configured to attenuate sound within theexhaust treatment device 10 within a predetermined frequency range. In particular, exhaust gases flowing through theflow path 33 and theinlet 40 into thecavity 38 will attenuate sound within theend cone 12. Referring toFIG. 8 , during operation, theend cone 12 can attenuate sound in a frequency range centered at 1300 Hertz as indicated by the empirically determinedsound attenuation curve 100. In particular, the end cone can attenuate sound 20 decibels at 1300 Hertz. Referring toFIG. 9 , in contrast, an end cone not configured to have a Helmholtz resonator does not reduce sound as much as theend cone 12, as indicated by the empirically determinedsound attenuation curve 110. It should be noted that in alternative embodiments, theend cone 12 can be configured to attenuate sound in frequency ranges centered at frequencies greater than 1300 Hertz or less than 1300 Hertz. - Referring to
FIG. 10 , a simulation program was utilized to generate asound attenuation curve 112 indicative of a predicted sound attenuation characteristic of theend cone 12. As illustrated, thesound attenuation curve 112 predicts that theend cone 12 can attenuate sound in a frequency range centered at 1267 Hertz. In particular, theend cone 12 can attenuate sound 16.27 decibels at 1267 Hertz. - Referring to
FIG. 7 , thehousing 14 is provided to enclose acatalyst 15 therein. Thehousing 14 includes atubular wall 50 and aninsulation layer 52. Theinsulation layer 52 is disposed against an inner surface of thetubular wall 50. Theinsulation layer 52 is substantially ring-shaped and defines a region for receiving thecatalyst 15 therein. Thewall 50 is coupled at anend 54 to theouter wall 32 of theend cone 12. Thewall 50 is further coupled at anend 56 to anouter wall 62 of theend cone 16. - The
catalyst 15 is provided to reduce certain exhaust gas constituents in exhaust gases received from an internal combustion engine (not shown). In one exemplary embodiment, thecatalyst 15 comprises a component of a catalytic converter. It should be noted that thecatalyst 15 can comprise any component capable of reducing at least one exhaust gas constituent from an internal combustion engine. - The
end cone 16 is provided to direct exhaust gases from thecatalyst 15 through theflow path 70. Theend cone 16 is further configured as a Helmholtz resonator to attenuate noise within a predetermined frequency range. Theend cone 16 includes aninner wall 60 and anouter wall 62. Theinner wall 60 and theouter wall 62 are constructed from stainless steel, in one exemplary embodiment. Theinner wall 60 is coupled to theouter wall 62 at anend 74. Theinner wall 60 is disposed in a spaced relationship with theouter wall 62 at anend 72, such that acavity 76 is defined between theinner wall 60 and theouter wall 62. Further, a portion of theinner wall 60 is embedded at theend 72 in theinsulation layer 52. Theouter wall 62 is further coupled at theend 72 to thewall 50 of thehousing 14. Theouter wall 62 includesapertures apertures cavity 76 define a Helmholtz resonator configured to attenuate sound within theend cone 16 within a predetermined frequency range. In particular, exhaust gases flowing through theapertures cavity 76 will attenuate sound within theend cone 16. Referring toFIG. 11 , a simulation program was utilized to generate asound attenuation curve 114 indicative of a predicted attenuation characteristic of theend cone 16. As illustrated, thesound attenuation curve 114 predicts that theend cone 16 can attenuate sound in a frequency range centered at 142 Hertz. In particular, theend cone 16 can attenuate sound 58 decibels at 142 Hertz. It should be noted that in alternative embodiments, theend cone 16 can be configured to attenuate sound in frequency ranges centered at frequencies less than 142 Hertz or greater than 142 Hertz. - Referring to
FIG. 12 , a partial view of anexhaust treatment device 130 in accordance with another exemplary embodiment is illustrated. Theexhaust treatment device 130 is provided to reduce emissions from an internal combustion engine (not shown). Further, theexhaust treatment device 130 is provided to reduce sound within predetermined frequency ranges within theexhaust treatment device 130. Theexhaust treatment device 130 includes anend cone 132, ahousing 134, acatalyst 135, and another end cone (not shown) coupled to thehousing 134. - The
end cone 132 is provided to direct exhaust gases into theexhaust treatment device 130. Theend cone 132 is further configured as a Helmholtz resonator to attenuate noise within a predetermined frequency range. Theend cone 132 includes aninner wall 140 and anouter wall 142. Theinner wall 140 and theouter wall 142 are constructed from stainless steel, in one exemplary embodiment. Theinner wall 140 is coupled to theouter wall 142 at anend 146 and defines aflow path 144 therein. Theinner wall 140 is disposed in a spaced relationship with theouter wall 142 at anend 148, such that a relativelylarge cavity 150 is defined between theinner wall 140 and theouter wall 142. Theouter wall 32 is further coupled at theend 148 to a wall of thehousing 134. Further, anannular inlet 152 is defined between theinner wall 140 and thecatalyst 135 disposed within thehousing 134. Thus, theinlet 152 and thecavity 150 define a Helmholtz resonator configured to attenuate sound within theexhaust treatment device 130 within a predetermined frequency range. In particular, exhaust gases flowing through theflow path 144 and theinlet 152 into thecavity 150 will attenuate sound within theend cone 132. - The
housing 134 is provided to enclose thecatalyst 135 therein and has a configuration similar tohousing 14 discussed above. - Referring to
FIG. 13 , a partial view of anotherexhaust treatment device 170 in accordance with an exemplary embodiment is illustrated. Theexhaust treatment device 170 is provided to reduce emissions from an internal combustion engine (not shown). Further, theexhaust treatment device 170 is provided to reduce sound within predetermined frequency ranges within theexhaust treatment device 170. Theexhaust treatment device 170 includes anend cone 172, ahousing 174, acatalyst 175, and another end cone (not shown) coupled to thehousing 174. - The
end cone 172 is provided to direct exhaust gases into theexhaust treatment device 170. Theend cone 172 is further configured as a Helmholtz resonator to attenuate noise within a predetermined frequency range. Theend cone 172 includes aninner wall 173 and anouter wall 176. Theinner wall 173 and theouter wall 176 are constructed from stainless steel. Theinner wall 173 is coupled to theouter wall 176 at anend 186 and defines aflow path 178 therein. Theinner wall 173 is disposed in a spaced relationship with theouter wall 176 at anend 188, such that a relativelylarge cavity 190 is defined between theinner wall 173 and theouter wall 176. Theinner wall 173 includesapertures outer wall 176 is further coupled at theend 188 to a wall of thehousing 174. Further, anannular inlet 192 is defined between theinner wall 173 and thecatalyst 175 disposed within thehousing 174. Thus, theannular inlet 192, theapertures cavity 150 define a Helmholtz resonator configured to attenuate sound within theend cone 172 within a predetermined frequency range. In particular, exhaust gases flowing through: (i) theflow path 144 and theinlet 152 into thecavity 190, and (ii) through theflow path 178 and theapertures cavity 190, will attenuate sound within theend cone 172. - The
housing 174 is provided to enclose thecatalyst 175 therein and has a configuration similar to thehousing 14 discussed above. - The exhaust treatment devices and the methods for reducing sound represent a substantial improvement over other devices and methods. In particular, the exhaust treatment devices and the methods provide a technical effect reducing sound within exhaust treatment devices within predetermined frequency ranges, which are not substantially attenuated by vehicle mufflers.
- While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. Moreover, the use of the terms first, second, etc. do not denote any order or importance, but rather the terms first, second, etc. are used to distinguish one element from another. Furthermore, the use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one of the referenced item.
Claims (12)
1. An exhaust treatment device, comprising:
a housing;
a catalyst disposed in the housing; and
a first end cone having a first inner wall and a first outer wall, the first outer wall secured to the first inner wall at one end, the first outer wall being secured to the housing at another end, the first inner wall being spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween, the first inner wall being spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, wherein exhaust gases flowing through the inlet into the first cavity attenuate sound within the first end cone and the housing.
2. The exhaust treatment device of claim 1 , wherein the exhaust gases flowing through the inlet into the first cavity attenuate sound at a predetermined frequency in the first end cone and the housing.
3. The exhaust treatment device of claim 1 , wherein the predetermined frequency is based on a volume of the first cavity, an area of the inlet, and a length of the inlet.
4. The exhaust treatment device of claim 1 , further comprising:
a second end cone disposed on the housing on an end of the housing opposite the first end cone, the second end cone having a second inner wall and a second outer wall, the second outer wall secured to the second inner wall at a first end, the second outer wall being secured to the housing at a second end, a portion of the second inner wall being spaced from the second outer wall such that the second inner wall and the second outer wall define a second cavity therebetween, the second inner wall having at least one aperture extending therethrough, wherein exhaust gases flowing through the at least one aperture into the second cavity attenuate sound within the second end cone and the housing.
5. The exhaust treatment device of claim 4 , wherein exhaust gases flowing through the inlet into the first cavity attenuate sound at a first predetermined frequency and exhaust gases flowing through the at least one aperture into the second cavity attenuate sound at a second predetermined frequency, the second predetermined frequency differing from the first predetermined frequency.
6. A method for reducing sound in an exhaust treatment device, the exhaust treatment device having a housing, a first end cone, and a catalyst, the catalyst being disposed in the housing, the first end cone having a first inner wall and a first outer wall, the first outer wall being secured to the first inner wall at one end, the first outer wall being secured to the housing at another end, the first inner wall being spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween, the first inner wall being spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, the method comprising:
receiving exhaust gases in the first end cone such that a portion of the exhaust gases flow through the inlet into the first cavity of the first end cone; and
attenuating sound within the first end cone and the housing utilizing the portion of the exhaust gases flowing through the inlet into the first cavity of the first end cone.
7. An exhaust treatment device, comprising:
a housing;
a catalyst disposed in the housing; and
a first end cone having a first inner wall and a first outer wall, the first outer wall secured to the first inner wall at one end, the first outer wall being secured to the housing at another end, the first inner wall being spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween, the first inner wall being spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, the first inner wall having at least one aperture extending therethrough, wherein exhaust gases flowing through the inlet and the at least one aperture of the first inner wall into the first cavity attenuate sound within the first end cone and the housing.
8. The exhaust treatment device of claim 7 , wherein the exhaust gases flowing through the inlet and the at least one aperture of the first inner wall into the first cavity attenuate sound at a predetermined frequency in the first end cone and the housing.
9. The exhaust treatment device of claim 8 , wherein the predetermined frequency is based on a volume of the first cavity, a combined area of the inlet and the aperture, a length of the inlet, and a thickness of the first inner wall proximate the aperture.
10. The exhaust treatment device of claim 7 , further comprising:
a second end cone disposed on the housing on an end of the housing opposite the first end cone, the second end cone having a second inner wall and a second outer wall, the second outer wall secured to the second inner wall at a first end, the second outer wall being secured to the housing at a second end, a portion of the second inner wall being spaced from the second outer wall such that the second inner wall and the second outer wall define a second cavity therebetween, the second inner wall having at least one aperture extending therethrough, wherein exhaust gases flowing through the at least one aperture of the second inner wall into the second cavity attenuate sound within the second end cone and the housing.
11. The exhaust treatment device of claim 10 , wherein exhaust gases flowing through the inlet and the at least one aperture of the first inner wall into the first cavity attenuate sound at a first predetermined frequency and exhaust gases flowing through the at least one aperture of the second inner wall into the second cavity attenuate sound at a second predetermined frequency, the second predetermined frequency differing from the first predetermined frequency.
12. A method for reducing sound in an exhaust treatment device, the exhaust treatment device having a housing, a first end cone, and a catalyst, the catalyst being disposed in the housing, the first end cone having a first inner wall and a first outer wall, the first outer wall being secured to the first inner wall at one end, the first outer wall being secured to the housing at another end, the first inner wall being spaced from the first outer wall at the other end such that the first inner wall and the first outer wall define a first cavity therebetween, the first inner wall being spaced from the catalyst at the other end such that an inlet is defined that communicates with the first cavity, the first inner wall having at least one aperture extending therethrough, the method comprising:
receiving exhaust gases in the first end cone such that a portion of the exhaust gases flow through the inlet into the first cavity of the first end cone and another portion of the exhaust gases flow through the at least one aperture of the first inner wall into the first cavity; and
attenuating sound within the first end cone and the housing utilizing the portion of the exhaust gases flow through the inlet into the first cavity of the first end cone and the portion of the exhaust gases flowing through the at least one aperture of the first inner wall into the first cavity.
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US11/504,904 US20080041043A1 (en) | 2006-08-16 | 2006-08-16 | Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices |
EP07075675A EP1892392A2 (en) | 2006-08-16 | 2007-08-13 | Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices |
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US11/504,904 US20080041043A1 (en) | 2006-08-16 | 2006-08-16 | Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices |
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US11/504,904 Abandoned US20080041043A1 (en) | 2006-08-16 | 2006-08-16 | Exhaust treatment devices and methods for reducing sound using the exhaust treatment devices |
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WO2019194784A1 (en) * | 2018-04-02 | 2019-10-10 | Cummins Emission Solutions Inc. | Aftertreatment system including noise reducing components |
US11143069B2 (en) | 2017-09-25 | 2021-10-12 | Faurecia Emissions Control Technologies, Usa, Llc | Method and apparatus to enable package space reduction in a vehicle exhaust system |
US11486289B2 (en) | 2018-07-03 | 2022-11-01 | Cummins Emission Solutions Inc. | Body mixing decomposition reactor |
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-
2006
- 2006-08-16 US US11/504,904 patent/US20080041043A1/en not_active Abandoned
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2007
- 2007-08-13 EP EP07075675A patent/EP1892392A2/en not_active Withdrawn
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US11143069B2 (en) | 2017-09-25 | 2021-10-12 | Faurecia Emissions Control Technologies, Usa, Llc | Method and apparatus to enable package space reduction in a vehicle exhaust system |
WO2019194784A1 (en) * | 2018-04-02 | 2019-10-10 | Cummins Emission Solutions Inc. | Aftertreatment system including noise reducing components |
GB2586752A (en) * | 2018-04-02 | 2021-03-03 | Cummins Emission Solutions Inc | Aftertreatment system including noise reducing components |
US11181027B2 (en) | 2018-04-02 | 2021-11-23 | Cummins Emission Solutions Inc. | Aftertreatment system including noise reducing components |
GB2586752B (en) * | 2018-04-02 | 2022-07-27 | Cummins Emission Solutions Inc | Aftertreatment system including noise reducing components |
US11486289B2 (en) | 2018-07-03 | 2022-11-01 | Cummins Emission Solutions Inc. | Body mixing decomposition reactor |
US11891937B2 (en) | 2018-07-03 | 2024-02-06 | Cummins Emission Solutions Inc. | Body mixing decomposition reactor |
Also Published As
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Legal Events
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AS | Assignment |
Owner name: DELPHI TECHNOLOGIES, INC., MICHIGAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ANDERSEN, ERIC H.;REEL/FRAME:018206/0242 Effective date: 20060815 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |