EP1085198A2 - Aktiv gesteuerter Einlasslärm mit Multipole-Einlassvorrichtung - Google Patents

Aktiv gesteuerter Einlasslärm mit Multipole-Einlassvorrichtung Download PDF

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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
Application number
EP00119166A
Other languages
English (en)
French (fr)
Other versions
EP1085198B1 (de
EP1085198A3 (de
Inventor
Ian R Mclean
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Tire Canada Inc
Original Assignee
Siemens Canada Ltd
Siemens VDO Automotive Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Canada Ltd, Siemens VDO Automotive Inc filed Critical Siemens Canada Ltd
Publication of EP1085198A2 publication Critical patent/EP1085198A2/de
Publication of EP1085198A3 publication Critical patent/EP1085198A3/de
Application granted granted Critical
Publication of EP1085198B1 publication Critical patent/EP1085198B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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)
EP20000119166 1999-09-14 2000-09-05 Aktiv gesteuerter Einlasslärm mit Multipole-Einlassvorrichtung Expired - Lifetime EP1085198B1 (de)

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 (de) 2001-03-21
EP1085198A3 EP1085198A3 (de) 2001-11-07
EP1085198B1 EP1085198B1 (de) 2002-12-04

Family

ID=22548458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000119166 Expired - Lifetime EP1085198B1 (de) 1999-09-14 2000-09-05 Aktiv gesteuerter Einlasslärm mit Multipole-Einlassvorrichtung

Country Status (2)

Country Link
EP (1) EP1085198B1 (de)
DE (1) DE60000904T2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10332610A1 (de) * 2003-07-17 2005-02-24 Siemens Ag Vorrichtung zur aktiven Beeinflussung der Geräuschemission einer Brennkraftmaschine mit einem durch das Lautsprechergehäuse geführten Kühlkörper
EP1249829A3 (de) * 2001-04-12 2006-09-13 Siemens VDO Automotive Inc. Niederfrequente aktive Geräuschdämpfung

Families Citing this family (1)

* Cited by examiner, † Cited by third party
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3936606A (en) * 1971-12-07 1976-02-03 Wanke Ronald L Acoustic abatement method and apparatus
FR2740599B1 (fr) * 1995-10-30 1997-12-19 Technofirst Dispositif d'attenuation acoustique active destine a etre dispose a l'interieur d'un conduit, en particulier pour l'insonorisation de reseau de ventilation et/ou de climatisation
US5828759A (en) * 1995-11-30 1998-10-27 Siemens Electric Limited System and method for reducing engine noise
US6084971A (en) * 1997-06-10 2000-07-04 Siemens Electric Limited Active noise attenuation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249829A3 (de) * 2001-04-12 2006-09-13 Siemens VDO Automotive Inc. Niederfrequente aktive Geräuschdämpfung
DE10332610A1 (de) * 2003-07-17 2005-02-24 Siemens Ag Vorrichtung zur aktiven Beeinflussung der Geräuschemission einer Brennkraftmaschine mit einem durch das Lautsprechergehäuse geführten Kühlkörper

Also Published As

Publication number Publication date
DE60000904D1 (de) 2003-01-16
EP1085198B1 (de) 2002-12-04
DE60000904T2 (de) 2003-09-18
EP1085198A3 (de) 2001-11-07

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