EP1085198A2 - Actively controlled induction noise using a multipole inlet - Google Patents
Actively controlled induction noise using a multipole inlet Download PDFInfo
- Publication number
- EP1085198A2 EP1085198A2 EP00119166A EP00119166A EP1085198A2 EP 1085198 A2 EP1085198 A2 EP 1085198A2 EP 00119166 A EP00119166 A EP 00119166A EP 00119166 A EP00119166 A EP 00119166A EP 1085198 A2 EP1085198 A2 EP 1085198A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- channels
- assembly
- engine
- noise
- set forth
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 8
- 230000005405 multipole Effects 0.000 title 1
- 238000002485 combustion reaction Methods 0.000 claims abstract description 15
- 230000007704 transition Effects 0.000 claims abstract description 10
- 239000013618 particulate matter Substances 0.000 claims description 9
- 230000011664 signaling Effects 0.000 claims 4
- 238000000034 method Methods 0.000 claims 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
- F02M35/1227—Flow throttling or guiding by using multiple air intake flow paths, e.g. bypass, honeycomb or pipes opening into an expansion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1244—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound
- F02M35/125—Intake silencers ; Sound modulation, transmission or amplification using interference; Masking or reflecting sound by using active elements, e.g. speakers
Definitions
- the subject invention relates to an improvement in noise reduction capabilities of an air induction system for an internal combustion engine.
- Active noise attenuation has been used to reduce engine noise emitted through an air induction system from the combustion chambers of internal combustion engines.
- One such example is pending United States Patent Application Number 08/872,506 "Active Noise Attenuation.”
- Noise attenuation assemblies of this type are affixed inside an air inlet duct leading to the engine's combustion chambers.
- the inlet duct includes an open end into which air is drawn for feeding the combustion chambers.
- the assembly includes a loud speaker mounted upon an internal housing.
- the internal housing forms an annular space with the inlet duct through which air travels.
- a controller generates an electrical signal from input generated from a primary microphone that measures a noise field emanating from the engine.
- the electrical signal is amplified and phase shifted from the noise field and the signal is applied to the loudspeaker for broadcasting a sound field phase shifted 180° from the noise field.
- the speaker needed is large relative to the amount of space available inside the assembly. Further, it is desirable to reduce vehicle mass and thus reduce the mass of components such as the speaker be reduced to amounts a low as is practicable to perform the requisite functions is a desirable goal. Therefore, it would be desirable to provide apparatus that can reduce the strength of the noise field, and enable the use of smaller, lighter, and less powerful speaker.
- the present invention discloses an active noise attenuation assembly for an air induction system of an internal combustion engine.
- the assembly includes an air inlet duct leading to the engine having an open end into which air is drawn.
- a fairing body is concentrically mounted within the air inlet duct and defines an annular space with the inlet duct. Air travels through the annular space to the combustion chambers of the engine.
- a loudspeaker is mounted on the fairing body and faces outwardly from the air inlet duct.
- a controller generates an electrical signal that is amplified and phase shifted from a noise field emanating from the engine. The electrical signal is applied to the loudspeaker for broadcasting a sound field phase shifted from the noise field 180° for attenuating the noise field.
- the assembly includes a transition housing mated to the open end of the inlet duct.
- the housing forms a first plurality of channels that communicate with the loudspeaker.
- a second plurality of channels communicates with the annular space.
- the channels form a checkered pattern at the inlet end of the housing.
- the checkered arrangement of the channels at the inlet end of the housing facilitates the transfer of particulate matter between the first and second plurality of channels. Because the sound fields are out of phase, particulate matter is pushed and pulled between the first and second plurality of channels at the inlet end of the housing. The transfer of the particulate matter between the channels dampens the noise field reducing the output requirements of the loudspeaker for attenuating the noise field. Reduced output requirements allows for the reduction in the size and power of the loudspeaker improving with the prior art.
- an active noise attenuation assembly is generally shown at 10.
- the assembly 10 includes an air inlet duct 12, which leads to an internal combustion engine 14. Air is channeled through the duct 12 into internal combustion chambers (not shown) within the engine 14 as is known in the art of internal combustion engines.
- the duct 12 includes an open end 16 into which air is drawn. The duct 12 is widest at the open end 16 and narrows as it approaches the engine 14.
- a fairing body 18 is concentrically mounted within the air inlet duct 12 and defines an annular space 20 with the inlet duct 12 through which the air travels.
- the fairing body 18 is hollow and generally contoured to the shape of the duct 12.
- the duct 12 includes a frame 22 for affixing the fairing body 18 to the duct 12.
- the frame 22 includes equally spaced radial bars 24 so as to allow maximum air flow through the annular space 20.
- a loudspeaker 26 is mounted on the fairing body 18 facing outwardly from the air inlet duct 12.
- the frame 22 includes spaced apertures 28 ( Figure 2) for receiving fasteners to mount the loudspeaker 26 to the fairing body 18.
- the fairing body 18 is affixed to an inner ring 30 of the frame 22 by a series of tabs 32.
- the loudspeaker 26 is arranged to broadcast in an opposite direction of the air flow.
- the loudspeaker 26 forms a closed chamber 34 with the fairing body 18.
- a controller 36 is secured inside the chamber 34 to the fairing body 18.
- the controller 36 generates an electrical signal amplified and phase shifted (preferably 180°, although other shifts are within the scope of this invention) from a noise field emanating from the engine 14.
- the noise field travels from the combustion chambers of the engine through the duct 12 in the opposite direction of the air flow.
- the controller 36 drives the loudspeaker 26 by applying the signal to the loudspeaker 26. Therefore, the loudspeaker 26 broadcasts a sound field that is phase shifted from the noise field.
- Phase shifting the sound field from the noise field attenuates the noise field generated by the engine 14 as is known in the art of active noise control. Again an 180° Shift is most preferred, but shifts approximately equal to 180°, but shifts approximately equal to 180° are also capable of performing a good deal of benefits of this invention.
- the noise field is detected by a primary microphone 38.
- the primary microphone 38 signals the controller 36 with the measured noise field from which the controller 36 determines the phase of the noise field.
- the primary microphone 38 is affixed to the duct 12 in a location determined to measure the noise field prior to being attenuated by the loudspeaker 26. Thus, the optimum location is between the fairing body 18 and the engine 14.
- a transition housing 40 is mated to the duct 12.
- the transition housing 40 includes an outlet end 42 and an inlet end 44.
- the outlet end 42 is mated to the open end 16 of the inlet duct 12.
- the housing forms a first plurality of channels 46 and a second plurality of channels 48.
- the channels terminate at the inlet end 44 in a checkered pattern ( Figure 3).
- the transition housing 40 includes eighteen of the first channels 46 and eighteen of the second channels 48.
- the first plurality of channels 46 communicates with the loudspeaker 26.
- the second plurality of channels 48 communicates with the annular space 20.
- the housing 40 includes a mating ring 41 having slots 43 communicating with the second plurality of channels 48.
- the noise field emanates through the annular space 20 into the second plurality of channels 48 against the flow of air.
- the second channels 48 extend radially inwardly from the outer slots 43.
- the ends of the second channels 48 are spaced inwardly from an outer surface.
- the loudspeaker 26 broadcasts the sound field through the first plurality channels 46 phase shifted from the noise field emanating from the engine 14 through the second plurality of channels 48.
- the sound field emanating from the loudspeaker 26 through the first plurality of channels 46 attenuates the sound field emanating from the engine 14 through the second plurality channels 48 at the inlet end 44. Locally attenuating the noise field in this manner prevents the noise field from traveling far away from the source.
- the checkered arrangement of the first and second plurality channels 46, 48 facilitates the transfer of particulate matter between the first and second channels 46, 48 because each of the first channels 46 is adjacent at least two of the second channels 48.
- the high amount of adjacent area between the first plurality of channels 46 and second plurality of channels 48 increases the potential for particulate transfer between the channels 46, 48.
- the 180° phase shift between the noise field and the sound field increases the amount of particulate matter transferred between the first and second plurality of channels 46, 48.
- the strength of the noise field is significantly dampened by the transfer of particulate matter into the second plurality of channels.
- the size and power requirements of the loudspeaker 26 necessary to attenuate the noise field are significantly reduced.
- some of the second channels 48 are spaced inwardly from an outer surface.
- Figures 3 and 4 show the preferred arrangement of the first and second channels 46, 48.
- An error microphone 49 is positioned adjacent the outlet end 42 for detecting unattenuated noise.
- the error microphone 49 senses both the noise field and the sound field and signals the controller 36 to adjust the phase of the sound field to improve the attenuating properties of the sound field.
- a filter cell 50 is affixed at the inlet end 44 of the transition housing 40 for filtering air entering the inlet end 44.
- the filter cell 50 includes filter media 52 through which the air is drawn into a central cavity 54.
- the error microphone 49 is located in or near the cavity 54.
- the noise field is attenuated in the cavity 54 before it can leave the filter cell 50 through the media 52.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Exhaust Silencers (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
Abstract
Description
- This application claims priority to provisional patent application 60/153,722, which was filed 14 September 1999. The subject invention relates to an improvement in noise reduction capabilities of an air induction system for an internal combustion engine.
- Active noise attenuation has been used to reduce engine noise emitted through an air induction system from the combustion chambers of internal combustion engines. One such example is pending United States Patent Application Number 08/872,506 "Active Noise Attenuation." Noise attenuation assemblies of this type are affixed inside an air inlet duct leading to the engine's combustion chambers. The inlet duct includes an open end into which air is drawn for feeding the combustion chambers. The assembly includes a loud speaker mounted upon an internal housing. The internal housing forms an annular space with the inlet duct through which air travels.
- A controller generates an electrical signal from input generated from a primary microphone that measures a noise field emanating from the engine. The electrical signal is amplified and phase shifted from the noise field and the signal is applied to the loudspeaker for broadcasting a sound field phase shifted 180° from the noise field.
- To generate a sound field strong enough to attenuate the noise field from the engine, the speaker needed is large relative to the amount of space available inside the assembly. Further, it is desirable to reduce vehicle mass and thus reduce the mass of components such as the speaker be reduced to amounts a low as is practicable to perform the requisite functions is a desirable goal. Therefore, it would be desirable to provide apparatus that can reduce the strength of the noise field, and enable the use of smaller, lighter, and less powerful speaker.
- The present invention discloses an active noise attenuation assembly for an air induction system of an internal combustion engine. The assembly includes an air inlet duct leading to the engine having an open end into which air is drawn. A fairing body is concentrically mounted within the air inlet duct and defines an annular space with the inlet duct. Air travels through the annular space to the combustion chambers of the engine.
- A loudspeaker is mounted on the fairing body and faces outwardly from the air inlet duct. A controller generates an electrical signal that is amplified and phase shifted from a noise field emanating from the engine. The electrical signal is applied to the loudspeaker for broadcasting a sound field phase shifted from the noise field 180° for attenuating the noise field.
- The assembly includes a transition housing mated to the open end of the inlet duct. The housing forms a first plurality of channels that communicate with the loudspeaker. A second plurality of channels communicates with the annular space. The channels form a checkered pattern at the inlet end of the housing.
- The checkered arrangement of the channels at the inlet end of the housing facilitates the transfer of particulate matter between the first and second plurality of channels. Because the sound fields are out of phase, particulate matter is pushed and pulled between the first and second plurality of channels at the inlet end of the housing. The transfer of the particulate matter between the channels dampens the noise field reducing the output requirements of the loudspeaker for attenuating the noise field. Reduced output requirements allows for the reduction in the size and power of the loudspeaker improving with the prior art.
- Other advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
- Figure 1 is a side sectional view of the subject invention;
- Figure 2 is an end view of the frame shown in Figure 1;
- Figure 3 is a sectional view along line 3-3 in Figure 1 showing the channels at the inlet end of the transition housing of the subject invention; and
- Figure 4 is a sectional view along line 4-4 in Figure 1 showing channels at the outlet end of the transition housing of the subject invention.
-
- Referring to the Figures 1, an active noise attenuation assembly is generally shown at 10. The assembly 10 includes an
air inlet duct 12, which leads to aninternal combustion engine 14. Air is channeled through theduct 12 into internal combustion chambers (not shown) within theengine 14 as is known in the art of internal combustion engines. Theduct 12 includes anopen end 16 into which air is drawn. Theduct 12 is widest at theopen end 16 and narrows as it approaches theengine 14. - A
fairing body 18 is concentrically mounted within theair inlet duct 12 and defines anannular space 20 with theinlet duct 12 through which the air travels. Thefairing body 18 is hollow and generally contoured to the shape of theduct 12. As best shown in Figure 2, theduct 12 includes aframe 22 for affixing thefairing body 18 to theduct 12. Theframe 22 includes equally spacedradial bars 24 so as to allow maximum air flow through theannular space 20. - Referring again to Figures 1, a
loudspeaker 26 is mounted on thefairing body 18 facing outwardly from theair inlet duct 12. Theframe 22 includes spaced apertures 28 (Figure 2) for receiving fasteners to mount theloudspeaker 26 to thefairing body 18. Thefairing body 18 is affixed to aninner ring 30 of theframe 22 by a series oftabs 32. Theloudspeaker 26 is arranged to broadcast in an opposite direction of the air flow. Theloudspeaker 26 forms a closedchamber 34 with thefairing body 18. Acontroller 36 is secured inside thechamber 34 to thefairing body 18. - The
controller 36 generates an electrical signal amplified and phase shifted (preferably 180°, although other shifts are within the scope of this invention) from a noise field emanating from theengine 14. The noise field travels from the combustion chambers of the engine through theduct 12 in the opposite direction of the air flow. Thecontroller 36 drives theloudspeaker 26 by applying the signal to theloudspeaker 26. Therefore, theloudspeaker 26 broadcasts a sound field that is phase shifted from the noise field. Phase shifting the sound field from the noise field attenuates the noise field generated by theengine 14 as is known in the art of active noise control. Again an 180° Shift is most preferred, but shifts approximately equal to 180°, but shifts approximately equal to 180° are also capable of performing a good deal of benefits of this invention. - The noise field is detected by a
primary microphone 38. Theprimary microphone 38 signals thecontroller 36 with the measured noise field from which thecontroller 36 determines the phase of the noise field. Theprimary microphone 38 is affixed to theduct 12 in a location determined to measure the noise field prior to being attenuated by theloudspeaker 26. Thus, the optimum location is between thefairing body 18 and theengine 14. - A
transition housing 40 is mated to theduct 12. Thetransition housing 40 includes anoutlet end 42 and aninlet end 44. Theoutlet end 42 is mated to theopen end 16 of theinlet duct 12. As best shown in Figures 3 and 4, the housing forms a first plurality ofchannels 46 and a second plurality ofchannels 48. The channels terminate at theinlet end 44 in a checkered pattern (Figure 3). In the preferred embodiment, thetransition housing 40 includes eighteen of thefirst channels 46 and eighteen of thesecond channels 48. The first plurality ofchannels 46 communicates with theloudspeaker 26. The second plurality ofchannels 48 communicates with theannular space 20. As best shown in Figure 4, thehousing 40 includes a mating ring 41 havingslots 43 communicating with the second plurality ofchannels 48. Air enters the second plurality ofchannels 48 and passes through theslots 43 into theannular space 20. The noise field emanates through theannular space 20 into the second plurality ofchannels 48 against the flow of air. As is clear from Figure 4, thesecond channels 48 extend radially inwardly from theouter slots 43. Thus, the ends of thesecond channels 48 are spaced inwardly from an outer surface. - The
loudspeaker 26 broadcasts the sound field through thefirst plurality channels 46 phase shifted from the noise field emanating from theengine 14 through the second plurality ofchannels 48. The sound field emanating from theloudspeaker 26 through the first plurality ofchannels 46 attenuates the sound field emanating from theengine 14 through thesecond plurality channels 48 at theinlet end 44. Locally attenuating the noise field in this manner prevents the noise field from traveling far away from the source. - The checkered arrangement of the first and
second plurality channels second channels first channels 46 is adjacent at least two of thesecond channels 48. The high amount of adjacent area between the first plurality ofchannels 46 and second plurality ofchannels 48 increases the potential for particulate transfer between thechannels channels loudspeaker 26 necessary to attenuate the noise field are significantly reduced. As can be appreciated from the schematic arrangement of thesecond channels 48 in Figure 1, some of thesecond channels 48 are spaced inwardly from an outer surface. Figures 3 and 4 show the preferred arrangement of the first andsecond channels - An error microphone 49 is positioned adjacent the
outlet end 42 for detecting unattenuated noise. The error microphone 49 senses both the noise field and the sound field and signals thecontroller 36 to adjust the phase of the sound field to improve the attenuating properties of the sound field. - As shown in Figure 1, a
filter cell 50 is affixed at theinlet end 44 of thetransition housing 40 for filtering air entering theinlet end 44. Thefilter cell 50 includesfilter media 52 through which the air is drawn into a central cavity 54. The error microphone 49 is located in or near the cavity 54. The noise field is attenuated in the cavity 54 before it can leave thefilter cell 50 through themedia 52. - The invention has been described in an illustrative manner, and it is to be understood that the terminology which has been used is intended to be in the nature of words of description rather than of limitation.
- Many modifications and variations of the present invention are possible in light of the above teachings. It is, therefore, to be understood that within the scope of the appended claims, wherein reference numerals are merely for convenience and are not to be in any way limiting, the invention may be practiced otherwise than as specifically described.
Claims (21)
- An active noise attenuation assembly for an air induction system of an internal combustion engine comprising:an air inlet duct leading to the engine having an open end into which air is drawn;a fairing body mounted within said air inlet duct defining a space with said inlet duct through which air travels;a loud speaker mounted on said fairing body facing outwardly from said air inlet duct;a controller for generating an electrical signal amplified and phase shifted from a noise field emanating from the engine and applying the signal to said loudspeaker for broadcasting a sound field phase shifted from the noise field thereby attenuating the noise field; anda transition housing mated to said open end of said inlet duct forming a first plurality of channels communicating with said loudspeaker and a second plurality of channels forming a ring around said fairing body for communicating with said annular space, said second plurality of channels terminating at a location spaced radially inward from an outer surface.
- An assembly as set forth in claim 1 wherein said speaker broadcasts said sound field through said first plurality of channels phase shifted from the noise field emanating from the engine through said second plurality of channels.
- An assembly as set forth in claim 2 wherein said sound field emanating from said speaker through said first plurality of channels attenuates the noise field emanating from the engine through said second plurality of channels.
- An assembly as set forth in claim 3 wherein the strength of the noise field emanating from the engine through said second plurality of channels is dampened by transfer of particulate matter between adjacent of said first and said second channels.
- An assembly as set forth in claim 1 wherein said air inlet duct includes a primary microphone for detecting the phase of the noise field emanating from the engine and for signaling the controller.
- An assembly as set forth in claim 5 including an error microphone for measuring both the noise field and the sound field and signaling said controller to adjust the phase of said sound field to improve attenuation the noise field.
- An assembly as set forth in 1 wherein said fairing body forms a closed chamber with said speaker.
- An assembly as set forth in claim 7 wherein said controller is disposed within said chamber formed by said fairing body and said speaker.
- An assembly as set forth in claim 1 wherein two of said ends of said second channels are adjacent to the majority of ends of said first channels.
- An assembly as set forth in claim 9 wherein said ends of said first and second channels are arranged in a checkered pattern.
- A method of attenuating noise emanating from an internal combustion engine and travelling through an air inlet end of an air induction assembly comprises the steps of:providing a loudspeaker mounted within said assembly facing outwardly of said assembly;detecting the noise field emanating from the engine for determining the phase of the noise wave;broadcasting a sound from said speaker out of phase of the noise field for attenuating the noise field; andseparating the sound field broadcast from the speaker into a first plurality of channels and separating the noise field emanating from the engine into a second plurality of channels, whereby said channels terminate in a pattern orienting each of said first plurality of channels adjacent to at least one of said second plurality of channels.
- An assembly as set forth in claim 10 further including the step of dampening the noise field emanating from the engine by passing particulate matter between adjacent of said checkered first and second channels.
- A method as set forth in claim 11 further including the step of measuring both the noise field and the sound field and adjusting the phase of the sound field to improve attenuation of the noise field.
- An active noise attenuation assembly for an air induction system of an internal combustion engine, said assembly comprising:an air inlet duct leading to the engine having an open end into which air is drawn;a fairing body mounted within said air inlet duct defining a space with said inlet duct through which air travels;a loud speaker mounted on said fairing body facing outwardly from said air inlet duct;a controller for generating an electrical signal amplified and phase shifted from a noise field emanating from the engine and applying the signal to said loudspeaker for broadcasting a sound field phase shifted from the noise field thereby attenuating the noise field; anda transition housing mated to said open end of said inlet duct forming a first plurality of channels communicating with said loudspeaker and a second plurality of channels communicating with said annular space wherein said channels terminate in a checkered pattern.
- An assembly as set forth in claim 14 wherein said speaker broadcasts said sound field through said first plurality of channels phase shifted from the noise field emanating from the engine through said second plurality of channels.
- An assembly as set forth in claim 15 wherein said sound field emanating from said speaker through said first plurality of channels attenuates the noise field emanating from the engine through said second plurality of channels.
- An assembly as set forth in claim 16 wherein the strength of the noise field emanating from the engine through said second plurality of channels is dampened by transfer of particulate matter between adjacent of said first and said second channels.
- An assembly as set forth in claim 14 wherein said air inlet duct includes a primary microphone for detecting the phase of the noise field emanating from the engine and for signaling the controller.
- An assembly as set forth in claim 18 including an error microphone for measuring both the noise field and the sound field and signaling said controller to adjust the phase of said sound field to improve attenuation the noise field.
- An assembly as set forth in 14 wherein said fairing body forms a closed chamber with said speaker.
- An assembly as set forth in claim 20 wherein said controller is disposed within said chamber formed by said fairing body and said speaker.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15372299P | 1999-09-14 | 1999-09-14 | |
US153722P | 1999-09-14 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1085198A2 true EP1085198A2 (en) | 2001-03-21 |
EP1085198A3 EP1085198A3 (en) | 2001-11-07 |
EP1085198B1 EP1085198B1 (en) | 2002-12-04 |
Family
ID=22548458
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20000119166 Expired - Lifetime EP1085198B1 (en) | 1999-09-14 | 2000-09-05 | Actively controlled induction noise using a multipole inlet |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1085198B1 (en) |
DE (1) | DE60000904T2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10332610A1 (en) * | 2003-07-17 | 2005-02-24 | Siemens Ag | Noise reduction system for use on combustion engines uses loud speaker in flow duct to cancel generated noise |
EP1249829A3 (en) * | 2001-04-12 | 2006-09-13 | Siemens VDO Automotive Inc. | Low frequency active noise control |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11021039B2 (en) * | 2017-10-20 | 2021-06-01 | Hanon Systems | Noise attenuation from waffle pattern and tongue and groove coupling for front of dash |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3936606A (en) * | 1971-12-07 | 1976-02-03 | Wanke Ronald L | Acoustic abatement method and apparatus |
FR2740599A1 (en) * | 1995-10-30 | 1997-04-30 | Technofirst | ACTIVE ACOUSTIC MITIGATION DEVICE INTENDED TO BE ARRANGED WITHIN A DUCT, PARTICULARLY FOR SOUNDPROOFING A VENTILATION AND / OR AIR CONDITIONING NETWORK |
WO1997020307A1 (en) * | 1995-11-30 | 1997-06-05 | Siemens Electric Limited | System and method for reducing engine noise |
EP0884471A2 (en) * | 1997-06-10 | 1998-12-16 | Siemens Canada Limited | Active noise attenuation system |
-
2000
- 2000-09-05 DE DE2000600904 patent/DE60000904T2/en not_active Expired - Lifetime
- 2000-09-05 EP EP20000119166 patent/EP1085198B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3936606A (en) * | 1971-12-07 | 1976-02-03 | Wanke Ronald L | Acoustic abatement method and apparatus |
FR2740599A1 (en) * | 1995-10-30 | 1997-04-30 | Technofirst | ACTIVE ACOUSTIC MITIGATION DEVICE INTENDED TO BE ARRANGED WITHIN A DUCT, PARTICULARLY FOR SOUNDPROOFING A VENTILATION AND / OR AIR CONDITIONING NETWORK |
WO1997020307A1 (en) * | 1995-11-30 | 1997-06-05 | Siemens Electric Limited | System and method for reducing engine noise |
EP0884471A2 (en) * | 1997-06-10 | 1998-12-16 | Siemens Canada Limited | Active noise attenuation system |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1249829A3 (en) * | 2001-04-12 | 2006-09-13 | Siemens VDO Automotive Inc. | Low frequency active noise control |
DE10332610A1 (en) * | 2003-07-17 | 2005-02-24 | Siemens Ag | Noise reduction system for use on combustion engines uses loud speaker in flow duct to cancel generated noise |
Also Published As
Publication number | Publication date |
---|---|
EP1085198A3 (en) | 2001-11-07 |
DE60000904D1 (en) | 2003-01-16 |
EP1085198B1 (en) | 2002-12-04 |
DE60000904T2 (en) | 2003-09-18 |
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