EP3349210A1 - Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug - Google Patents

Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug Download PDF

Info

Publication number
EP3349210A1
EP3349210A1 EP17151137.1A EP17151137A EP3349210A1 EP 3349210 A1 EP3349210 A1 EP 3349210A1 EP 17151137 A EP17151137 A EP 17151137A EP 3349210 A1 EP3349210 A1 EP 3349210A1
Authority
EP
European Patent Office
Prior art keywords
vehicle
frequency
sound waves
active noise
sound
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.)
Withdrawn
Application number
EP17151137.1A
Other languages
English (en)
French (fr)
Inventor
Ingo Moldenhauer
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.)
Alpine Electronics Inc
Original Assignee
Alpine Electronics 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 Alpine Electronics Inc filed Critical Alpine Electronics Inc
Priority to EP17151137.1A priority Critical patent/EP3349210A1/de
Publication of EP3349210A1 publication Critical patent/EP3349210A1/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/10—Applications
    • G10K2210/128—Vehicles
    • G10K2210/1282—Automobiles
    • G10K2210/12821—Rolling noise; Wind and body noise

Definitions

  • the present disclosure relates to an active noise reduction apparatus and active noise reduction method for a vehicle.
  • JP 2005-234203 A discloses a small-sized silencing device capable of eliminating only a target noise sound without causing a silencing wave to scatter.
  • a silencing device which is equipped with a microphone, an electric circuit performing conversion into an electric signal opposite in phase to and equal in amplitude to an electric signal generated by converting a noise sound picked up by the microphone, and a speaker which outputs the electric signal as a sound signal.
  • the silencing device uses a directional speaker as this speaker.
  • Electronic equipment mounted with the silencing device is configured to silence the noise sound by arranging the silencing device where a noise sound outputted from a noise generating source incorporated in a housing can be silenced.
  • US 8 706 351 B2 discloses an active noise cancellation apparatus capable of reliably reducing road noise by a technique other than mounting a vibration generator on a floor panel itself or another plate-like interior part itself, while reducing costs and size of the apparatus.
  • a reference signal detector is mounted on a knuckle and the vibration generator is mounted on a wheel housing or a suspension member.
  • An error signal detector detects vibration of the wheel housing or vibration of the suspension member as an error signal, or detects sound in a vehicle interior as an error signal.
  • a controller controls the vibration generator based on the reference signal and the error signal so as to reduce the error signal.
  • JP 2003-216163 A provides a noise controller capable of reducing noise from a plurality of noise sources without increasing microphones for detecting the noise to be generated by the noise sources.
  • a data reading part reads pieces of pseudo noise data corresponding to noise source information acquired via an IF (interface) part from a pseudo noise data base based on the noise source information and successively supplies them to a specified adaptive controller. No microphone for detecting the noise to be generated by the noise sources is required to be installed.
  • JP 2011-168151 A provides a vehicle-mounted silencer capable of silencing sound that is uncomfortable to an occupant in an electric vehicle, a hybrid vehicle or the like, although, when such a vehicle is traveling with an electric motor, there is no engine sound of a conventional vehicle and only there is a quiet motor sound, but this motor sound generates the uncomfortable sound because of the quietness of the motor sound.
  • This vehicle-mounted silencer mounted to a vehicle comprises a silencing sound output means for outputting sounds to muffle noises in a car generated during travelling of the vehicle, and the noises are silenced by the silencing sounds outputted by the silencing sound output means.
  • a typical source of noise generated by a vehicle is noise generated at the contact surface between a tire of a wheel of the vehicle and the road.
  • Such "road noise” can be heard inside and outside the vehicle, and in particular can include noise frequencies dependent on speed of the vehicle which can be heard far away from a motorway, for example.
  • Such noise can hardly be reduced or avoided at the source of the noise, i.e. at the contact surface between tire and road.
  • some newly built or refurbished roads are constructed with a special kind of "quiet tarmac" which produces reduced noise between road surface and wheel as compared to conventional roads.
  • such solutions are very cost intensive and often less effective.
  • the invention relates to an active noise reduction apparatus and active noise reduction method for a vehicle according to the independent claims. Embodiments thereof are disclosed in the dependent claims.
  • an active noise reduction apparatus for a vehicle, comprising a detecting device configured to detect at least one reference signal which is indicative of at least one component of a noise generated at a contact area between a wheel of the vehicle and a track on which the vehicle is travelling, a sound emitting device for emitting sound waves towards the at least one contact area between the wheel of the vehicle and the track on which the vehicle is travelling, and a control device which is operatively coupled with the detecting device and the sound emitting device.
  • the control device is configured to control the sound emitting device for emitting sound waves based on the detected at least one reference signal so as to reduce the at least one component of the noise through active noise cancellation by the emitted sound waves.
  • an active noise reduction method for a vehicle comprising detecting at least one reference signal which is indicative of at least one component of a noise generated at a contact area between a wheel of the vehicle and a track on which the vehicle is travelling, and emitting sound waves towards the at least one contact area between the wheel of the vehicle and the track on which the vehicle is travelling based on the detected at least one reference signal so as to reduce the at least one component of the noise through active noise cancellation by the emitted sound waves.
  • a vehicle comprising an active noise reduction apparatus according to aspects of the invention as described herein.
  • the sound emitting device comprises a directed speaker which outputs cancellation sound waves towards the source of the noise (in particular contact surface of wheel and track). At this point the emitted sound waves overlay the noise, so that any road noise can be reduced in accordance with the principle of active noise cancellation (emitting sound waves opposite in phase and approximately equal in amplitude to respective noise frequencies to be reduced or canceled).
  • cancellation sound waves are generated to reduce the noise generated at a contact area between a wheel of the vehicle and a track on which the vehicle is traveling.
  • it shall not create additional audible sound. Therefore, the sound waves are directed towards the source of the noise generated at a contact area between wheel and track, such that in other directions from the sound emitting device the emitted sound waves shall not be audible.
  • the invention is preferably applicable in an automobile which typically drives on roads, such as a passenger car or freight vehicle (e.g. motor truck).
  • the invention is, in principle, applicable to any type of vehicles having wheels running on a track.
  • road noise when referring to noise generated at a contact area between a wheel of the vehicle and a track on which the vehicle is traveling. This shall, however, not imply any restriction as to the type of vehicle and the underground or track on which the vehicle is traveling.
  • control device is configured to determine at least one frequency from the detected at least one reference signal, and to control the sound emitting device to emit sound waves having the determined at least one frequency.
  • control device determines at least one frequency from the detected at least one reference signal which is caused by track surface contact of the wheel and air displacement.
  • control device is configured to adjust a phase delay for the determined at least one frequency and to control the sound emitting device to emit sound waves having the determined at least one frequency at the adjusted phase delay.
  • control device is configured to determine at least one regular repeating frequency, which is particularly depending on a rotation speed of the wheel, from the detected at least one reference signal.
  • control device is configured to determine at least one frequency in a range between 100 and 1000 Hz from the detected at least one reference signal, and to control the sound emitting device to emit sound waves having the determined at least one frequency.
  • the detecting device, the control device, and the sound emitting device are operatively coupled in a closed loop configuration.
  • the closed loop configuration is self-calibrating.
  • control device is configured to determine in an iterative process at least one frequency from the detected at least one reference signal while the sound emitting device emits sound waves, to adjust a phase delay for the determined at least one frequency, and to control the sound emitting device to emit sound waves having the determined at least one frequency at the adjusted phase delay.
  • the detecting device comprises a microphone.
  • the apparatus and method may react on any changes of the road surface or weather conditions.
  • control device is configured to determine at least one exemption frequency from the detected at least one reference signal which is indicative of a characteristic road marking on the track on which the vehicle is travelling.
  • the control device controls the sound emitting device to not emit sound waves having the determined at least one exemption frequency.
  • the sound emitting device comprises an array of loudspeakers configured to emit directional sound waves, in particular unidirectional sound waves.
  • control device and/or parts of the detecting device and sound emitting device may be implemented in hardware and/or in software.
  • Each one or some of them, particularly the control device may be, for example, implemented in, or part of, an ECU of the vehicle, or may be a separate component (in hardware and/or software), or may be a distributed system (in hardware and/or software) using one or more processors and/or integrated circuits.
  • Fig. 1 depicts a schematic diagram illustrating a wheel 3 of a vehicle (not expressly shown) which is running on a track 4 during traveling, such as a road.
  • the wheel comprises a tire 31 having a profile on the outer circumference, as is commonly known.
  • noise 50 is generated at a contact area 41 between the wheel 3 and the road 4.
  • the noise 50 is caused by rotation of the wheel 3 with the tire profile, which results in air displacement, deformation of wheel and/or tire and road surface contact.
  • Fig. 3 shows an active noise reduction apparatus 1 for a vehicle according to an embodiment of the invention. It comprises a detecting device 11, which particularly includes a microphone.
  • the detecting device 11, in particular the microphone detects at least one reference signal which is indicative of at least one component of the noise 50 as described above (step S1 in Fig. 4 ).
  • the at least one reference signal is one or more acoustic signals detected by the microphone which are indicative of at least one component of the noise 50.
  • the at least one component may be one or more frequencies of sound waves of the noise 50.
  • a control device 12 is operatively coupled with the detecting device 11.
  • the control device 12 receives the detected reference signal from the microphone and performs a noise measurement, such as a signal analysis of the components (such as of the frequencies) included in the detected reference signal (step S2 in Fig. 4 ).
  • a noise measurement may be performed in a noise measurement unit 21 of the control device 12.
  • the control device 12 may then determine at least one frequency which is included in the noise 50 from the detected at least one reference signal.
  • the control device determines at least one frequency having the highest amplitude and/or power within the sound waves of the noise 50.
  • the control device determines at least one regular repeating frequency within the noise 50, which is, for example, depending on a rotation speed of the wheel 3.
  • the rotation of the wheel causes regular repeating noise frequencies which depend on the rotation speed of the wheel, e.g. by air displacement and deformation of the tire which are varying with rotation speed.
  • the control device 12 determines at least one frequency in a range between 100 and 1000 Hz, which often are typical road noise frequencies. The determination of the one or more frequencies may also be performed by the noise measurement unit 21.
  • a phase adjustment unit 22 may then adjust a phase delay for the determined at least one frequency determined by the noise measurement unit 21 (step S3 in Fig. 4 ).
  • a phase delay may be adjusted for one or more frequencies determined by the noise measurement unit 21 such that noise cancellation sound waves 60 emitted with the one or more frequencies are at least roughly opposite in phase to respective sound waves contained in the noise 50 having these frequencies according to the known principles of active noise cancellation.
  • control signals are generated which cause the sound emitting device 13 to emit sound waves 60 having the determined at least one frequency at the adjusted phase delay (steps S4 and S5 in Fig. 4 ).
  • the sound emitting device 13 comprises loudspeakers 13-1 and/or 13-2 as shown in Fig. 2 for emitting the sound waves 60 towards the at least one contact area 41 between the wheel 3 of the vehicle and the track 4.
  • the loudspeakers 13-1, 13-2 emit sound waves 60 which - as they are roughly opposite in phase - reduce noise at the respective frequency through active noise cancellation. If a vehicle has four wheel, for example four or eight such loudspeakers may be arranged on the vehicle for emitting cancellation sound waves 60 towards the respective contact area 41 between the respective wheel 3 of the vehicle and the track 4.
  • the loudspeakers 13-1, 13-2 are located on one or both sides of a rotation axis of the wheel 3, e.g. when viewed in driving direction of the vehicle in front of and/or behind the wheel 3, as shown in Fig. 2 .
  • the sound emitting device 13 comprises an array of loudspeakers which emit directional sound waves 60, in particular unidirectional sound waves 60, towards the contact area 41 between the wheel 3 of the vehicle and the track 4. This reduces additional sound wave emission in other directions than the source of the noise.
  • the detecting device 11, the control device 12, and the sound emitting device 13 are operatively coupled in a closed loop configuration 14 which is self-calibrating.
  • control device 12 determines one or more frequencies from the detected one or more reference signals while the sound emitting device 13 emits sound waves 60 for noise cancellation towards the contact area 41, adjusts a respective phase delay for the determined frequencies, and controls the sound emitting device 13 to emit sound waves 60 having the determined frequencies at the respective adjusted phase delay.
  • adjustment may be performed step by step in each respective iteration until a full flat cancellation is achieved.
  • noise measurement unit 21, phase adjustment unit 22 and DSP sound generation unit 23 may be implemented at least partially in software and/or hardware within one or more processor units, such as a microprocessor of an ECU of the vehicle.
  • Fig. 5 depicts a schematic diagram illustrating an exemplary road 4 with road markings 42, which embodiments of the invention take account of.
  • road markings 42 protrude from the road surface in a particular height (e..g. caused by alternating paint thickness) which causes a characteristic noise which the driver recognizes when the wheel 3 rotates along the road markings 42.
  • the control device 12 determines at least one exemption frequency from the detected one or more reference signals which is indicative of sound or noise caused by such characteristic road marking 42 on the track 4. It then controls the sound emitting device 13 to not emit sound waves 60 having the determined at least one exemption frequency. In other words, the control device 12 determines at least one frequency in the noise 50 which is indicative of a characteristic road marking 42 on the track 4. Such frequency is determined to be an exemption frequency at which no noise cancellation sound waves 60 shall be emitted to keep the warning effect of the noise 50 caused by the road marking 42.
  • the system keeps data of typical structures of noise generating road markings (such as alternating paint thickness) and may adjust the noise cancellation accordingly.
  • cancellation sound waves are created to reduce noise caused by the vehicle running on a track, such as road noise. Preferably, it does not create an additional audible sound. To this end, the cancellation sound waves are directed towards the source of road noise, so that in other directions from the sound emitting device nothing shall be audible.
  • road noise generated by the tire profile includes regular repeating frequencies depending on the profile which are variable by the rotation speed of the wheel.
  • the system measures the resulting noise by microphone. Then the phase delay may be adjusted step by step for each frequency until preferably a full flat cancellation is achieved. As a result the system becomes self-calibrating.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
EP17151137.1A 2017-01-12 2017-01-12 Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug Withdrawn EP3349210A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17151137.1A EP3349210A1 (de) 2017-01-12 2017-01-12 Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17151137.1A EP3349210A1 (de) 2017-01-12 2017-01-12 Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug

Publications (1)

Publication Number Publication Date
EP3349210A1 true EP3349210A1 (de) 2018-07-18

Family

ID=57838184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17151137.1A Withdrawn EP3349210A1 (de) 2017-01-12 2017-01-12 Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug

Country Status (1)

Country Link
EP (1) EP3349210A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3979236A1 (de) * 2020-09-30 2022-04-06 Bridgestone Europe NV/SA System zur aktiven geräuschunterdrückung und verfahren zur aussengeräuschreduzierung

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5598479A (en) * 1994-01-29 1997-01-28 Continental Aktiengesellschaft Device for reducing tire/road surface noise
DE19900782A1 (de) * 1999-01-12 2000-07-13 Ruediger Ufermann Vorrichtung zur aktiven Verminderung des Reifen- oder Fahrbahngeräusches
DE20000581U1 (de) * 2000-01-14 2000-08-24 Gauermann Joerg Antirumorsystem
JP2003216163A (ja) 2002-01-21 2003-07-30 Denso Corp 騒音制御装置
JP2005234203A (ja) 2004-02-19 2005-09-02 Citizen Watch Co Ltd 消音装置および電子機器
JP2011168151A (ja) 2010-02-18 2011-09-01 Manabu Goto 乗り物用消音装置
US20120230504A1 (en) * 2009-09-10 2012-09-13 Pioneer Corporation Noise-reduction device
US8706351B2 (en) 2011-05-19 2014-04-22 Tokai Rubber Industries, Ltd. Active noise cancellation apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5598479A (en) * 1994-01-29 1997-01-28 Continental Aktiengesellschaft Device for reducing tire/road surface noise
DE19900782A1 (de) * 1999-01-12 2000-07-13 Ruediger Ufermann Vorrichtung zur aktiven Verminderung des Reifen- oder Fahrbahngeräusches
DE20000581U1 (de) * 2000-01-14 2000-08-24 Gauermann Joerg Antirumorsystem
JP2003216163A (ja) 2002-01-21 2003-07-30 Denso Corp 騒音制御装置
JP2005234203A (ja) 2004-02-19 2005-09-02 Citizen Watch Co Ltd 消音装置および電子機器
US20120230504A1 (en) * 2009-09-10 2012-09-13 Pioneer Corporation Noise-reduction device
JP2011168151A (ja) 2010-02-18 2011-09-01 Manabu Goto 乗り物用消音装置
US8706351B2 (en) 2011-05-19 2014-04-22 Tokai Rubber Industries, Ltd. Active noise cancellation apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3979236A1 (de) * 2020-09-30 2022-04-06 Bridgestone Europe NV/SA System zur aktiven geräuschunterdrückung und verfahren zur aussengeräuschreduzierung
WO2022069593A1 (en) 2020-09-30 2022-04-07 Bridgestone Europe Nv/Sa Active noise cancelling system and method for exterior noise reduction

Similar Documents

Publication Publication Date Title
US8204243B2 (en) Synthetic engine sound for electric vehicle based on detected direction of travel
US10067907B2 (en) Vehicle including noise management system having automotive audio bus (A2B) interface
JP3533092B2 (ja) オーディオシステム
US9050925B2 (en) Vehicle having an electric drive
JP2021154807A (ja) 車両近接報知システム、車両および車両近接報知方法
EP3349210A1 (de) Aktive rauschunterdrückungsvorrichtung und verfahren für ein fahrzeug
CN110871787A (zh) 用于有效噪声和振动性能的内部噪声感测的方法和装置
JP5926158B2 (ja) 能動型消音装置
JP2004214852A (ja) 振動伝播抑制構造
JP7132545B2 (ja) 車両接近通報装置
CN110103863B (zh) 车身安装的车辆噪声消除系统
JP2009298288A (ja) 車両用能動型音響制御システム
JP2009241672A (ja) 能動型騒音制御装置
JP2020158041A (ja) 車両近接報知装置、車両および車両近接報知方法
JP2007216787A (ja) 車体振動検出装置及び騒音制御装置
JP2019119375A (ja) タイヤ騒音低減装置
US10766494B2 (en) Road surface characterization based upon filter coefficients
JP4955839B2 (ja) 擬似音発生装置及び擬似音発生方法
JP2010228641A (ja) 車両内騒音低減装置
JP2011183964A (ja) 電動自動車の警報音発生装置
CN112558508A (zh) 一种带作动器的分频段路噪主动控制系统
WO2019241657A1 (en) Concurrent fxlms system with common reference and error signals
WO2011135685A1 (ja) 電動移動体
US11948547B2 (en) Information quantity-based reference sensor selection and active noise control using the same
CN111316351B (zh) 一种用于生成声补偿信号的设备

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20190119