EP1717433A9 - Silencieux d'admission actif - Google Patents

Silencieux d'admission actif Download PDF

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Publication number
EP1717433A9
EP1717433A9 EP06003126A EP06003126A EP1717433A9 EP 1717433 A9 EP1717433 A9 EP 1717433A9 EP 06003126 A EP06003126 A EP 06003126A EP 06003126 A EP06003126 A EP 06003126A EP 1717433 A9 EP1717433 A9 EP 1717433A9
Authority
EP
European Patent Office
Prior art keywords
intake
silencer according
membrane
intake silencer
air
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Withdrawn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
EP06003126A
Other languages
German (de)
English (en)
Other versions
EP1717433A2 (fr
EP1717433A3 (fr
Inventor
Oliver Seibt
Graham Bush
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik GmbH
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 Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP1717433A2 publication Critical patent/EP1717433A2/fr
Publication of EP1717433A9 publication Critical patent/EP1717433A9/fr
Publication of EP1717433A3 publication Critical patent/EP1717433A3/fr
Withdrawn legal-status Critical Current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
    • F02M35/1222—Flow throttling or guiding by using adjustable or movable elements, e.g. valves, membranes, bellows, expanding or shrinking elements
    • 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 invention relates to an active intake silencer for air intake ducts according to the features in the preamble of patent claim 1.
  • intake silencers are provided to dampen the engine intake air intake sound intensity to an acceptable level.
  • Legal requirements provide a legal framework for soundproofing.
  • Passive silencers work on the principle of sound absorption and have fibrous or porous materials that have large and highly structured surfaces.
  • the intake air sound is to be diverted and reflected in this way in absorbing and sound-absorbing mazes, so that the sound energy is dissipated until the intake air noise has fallen below a desired level.
  • Passive silencers which operate on the principle of sound absorption, block the intake air. In that way they reduce the power of the engine.
  • Counter-noise can be generated passively through specially designed resonators or actively via loudspeakers.
  • Resonators can for example be designed as ⁇ / 4-pipe and be coupled laterally to the air intake duct.
  • ⁇ / 4-tube sound is phase-shifted by 180 ° reflected.
  • the reflected sound waves are superimposed with the disturbing sound and thus cause the sound attenuation.
  • account must be taken of the time it takes the sound to propagate twice over the length of the ⁇ / 4 tube.
  • the frequency of the intake air sound has changed in the air intake ducts due to the dynamic conditions, so that it does not come to the desired compensation in the superposition with the reflected sound.
  • the frequencies at which extinction is possible are for physical reasons from the outset limited to multiples of ⁇ / 4.
  • control circuits and control loops are used.
  • sensors for the intake air sound take on relevant parameters such. As the engine speed, the load state of the engine and the temperature of the intake air.
  • a control unit generates corresponding output signals on the basis of these input signals, with which the loudspeaker arranged on the air intake duct is controlled.
  • Such control circuits are relatively easy to manufacture and provide acceptable results at a low cost.
  • the sound attenuation can be further improved by a control loop.
  • the sensor system is preferably supplemented by a pressure sensor or a microphone.
  • the control unit in conjunction with the loudspeaker can then generate exactly matched compensation sound, which is adapted to the dynamic changes in the intake air sound and therefore has a high damping effect.
  • the physical conditions in the attenuation of intake air sound are difficult.
  • the intake air sound has a high sound pressure level, with the intake air flow pulsing.
  • the installation location in the engine compartment is warm and humid.
  • the conventional cone speakers previously used for Ansaug Kunststoffschalldämpfung not withstand the harsh physical conditions.
  • the membrane and magnets wear out very quickly. For experimental reasons, therefore, titanium membranes were used; However, these are too expensive for mass production.
  • large-area membranes and heavy magnets are required for the generation of low frequencies, for z. B. in motor vehicles no space available and are not taken into account for mass production due to their weight.
  • the present invention seeks to provide an active intake silencer, which superimposed on the intake air noise with compensation sound in the required intensity regardless of the vehicle type and also characterized by a compact design and durability or reliability.
  • the core idea here is to superimpose the intake air sound with the compensation sound of a loudspeaker, which works as an electroacoustic transducer based on bending waves.
  • Such speakers have a membrane on the surface of which bending waves and shear waves propagate when excited by a transducer to vibrate.
  • the wave propagation in membranes takes place in different ways. While density and expansion waves are dominant in thicker membranes, bending and shear waves also occur in thinner media. For use in loudspeakers, the bending wave components have proved suitable for their amplitude and their propagation behavior.
  • the propagation behavior of bending waves in a membrane is significantly influenced by the bending stiffness of the membrane.
  • the bending stiffness is frequency-dependent.
  • coincidence frequency the phase velocity of the wave in the membrane is identical to the phase velocity in the air.
  • the wave separates from the membrane at an angle of about 0 °. Above the coincidence frequency, the angle increases up to 90 °, whereby the efficiency increases dramatically.
  • the coincidence frequency is therefore the lowest frequency at which flexural waves are converted into airborne sound waves. Below this frequency, pure piston oscillation is predominant.
  • Such speakers are characterized particularly advantageous by their flat design.
  • the membrane is thin and preferably flat or slightly curved.
  • the transducer is attached to and coupled to the back of the membrane.
  • the membrane is held in a frame of the housing of the loudspeaker.
  • the housing is located on the side facing away from the intake air flow side of the membrane and also encloses the transducer.
  • the membrane must be designed to withstand the particular physical requirements of an air intake duct, especially with regard to temperature and humidity. Another requirement may be that it must be intake air tight.
  • the loudspeaker is controlled by a control unit, which is coupled to a sensor via signal lines.
  • the intake silencer can thus be constructed both as a control circuit as well as a control circuit and thus dampen the intake air sound active and with high efficiency.
  • the membrane may be disposed in an opening in the wall of the air intake duct. It is expediently arranged in an air filter unit or an air collector housing. These embodiments allow by integrating into an existing component a particularly compact design. The direct coupling of the loudspeaker with the intake air flow simplifies the damping considerably, because fewer factors have to be taken into account when generating the counter sound.
  • the membrane is flat. In this way, the calculation of the bending waves and the design of the membrane are significantly simplified. In addition, a compact design is achieved with large membranes, which can be placed in the immediate vicinity of the air intake duct.
  • the membrane can consist of a stainless steel foil. This feature increases the durability of the membrane in view of the physical requirements. But it is also possible that the membrane is vapor-deposited on the side facing the intake air flow with metal or covered with a stainless steel foil. Both solutions advantageously increase one-sided the durability of the membrane and make it possible to produce the membrane on a less expensive material.
  • the intake air sound is influenced in its properties essentially by the engine, that is its speed level and its load state, as well as by the temperature of the intake air flow. Accordingly, it is provided to couple the control unit with a motor control electronics. Motor data can be continuously transmitted to the control unit during operation via the direct connection - without the need for cumbersome signal conversion with the associated loss of efficiency and time. For this purpose, corresponding interfaces are output side to provide the engine control electronics and input side of the control unit.
  • the sensor system may include a temperature sensor for measuring the intake air temperature in the air intake duct. Since the speed of sound is particularly dependent on the temperature of the intake air, taking into account the intake air temperature substantially increases the efficiency of the intake silencer.
  • the sensor system may include a throttle position sensor for detecting the throttle position.
  • the throttle position allows to draw conclusions about the load condition of the engine.
  • sensors are common in today's motor vehicles and can also be used within the scope of the claimed invention.
  • the sensor system may include a sensor for detecting the engine speed.
  • the sensor system may also include a pressure sensor or a microphone for detecting the intake air sound in the air intake duct.
  • a control circuit for generating the compensation sound a particularly high efficiency in the attenuation of the intake air is achieved. This sensor is then run as well as the speaker intake air resistant.
  • the control unit can be microprocessor-controlled. This feature allows flexible adaptation of the intake silencer to different practical conditions.
  • the control behavior of the control unit is now program-controlled.
  • the programs can be changed or exchanged via a corresponding interface on the control unit. In this way, a design of the intake air sound in the sense of a sound design is possible.
  • a microprocessor-controlled control unit also simplifies the vehicle-independent installation of the intake silencer, since with the same hardware, only the software has to be adapted.
  • control behavior of the control unit can be adjustable. In this way, the driver is allowed to influence the sound of the vehicle directly via switches or knobs, e.g. to make it sound particularly sporty or quiet.
  • the transducer may be a voice coil.
  • Voice coils are characterized by their compact design and the fact that they comprise only a few moving parts.
  • the converter comprises an electric motor, to whose drive shaft an eccentric is attached, which is coupled via a connecting rod with the membrane. In this way, a vibration of the membrane in a frequency can be generated particularly easily and in a robust manner.
  • the converter can also be made heat resistant.
  • the housing serves two main purposes, namely protection against environmental influences and for ease of assembly, in that the transducer with the membrane and the housing can be delivered prefabricated in the assembly as an assembly.
  • an active intake muffler 1 for an air intake passage 2 is shown in longitudinal section on the example of a motor vehicle. This is arranged in an air filter unit 28.
  • the active intake muffler 1 the sound of the intake air is superimposed with a phase-shifted by 180 ° compensation sound of a speaker 3 and thus damped or extinguished.
  • the flat speaker 3 is inserted in a side opening 4 in the wall 5 of the air intake passage 2 of a motor, not shown.
  • the loudspeaker 3 has a membrane 7 and arranged in a housing 6 a voice coil 8.
  • the membrane 7 is thin and consists of a stainless steel foil so that it has a particularly low coincidence frequency and a broad frequency spectrum within which it oscillates.
  • the membrane 7 is made heat and moisture resistant and aligned so that its surface 9 comes into contact with the intake air flow AS.
  • the voice coil 8 is fixed and stimulates the diaphragm 7 to oscillate, thereby bending waves propagate to the intake air facing surface 9 of the membrane 7.
  • the voice coil 8 is also made heat and moisture resistant.
  • the speaker 3 has enough potential to generate compensation sound in the required intensity.
  • the loudspeaker 3 is controlled by a microprocessor-controlled control unit 10, which is fastened separately to the vehicle body, not shown in detail. It has additional interfaces 11-16 for sensors, an operating unit 17, data transfer and power supply. On the basis of the signals transmitted by the sensor, the control unit 10 calculates a compensation oscillation. This is converted into an electrical oscillation by a digital / analog converter 18 and amplified by an amplifier 19 belonging to the control unit, before it is forwarded to the loudspeaker 3. The calculation of the compensation oscillation is program-controlled. The programs are interchangeable via the data transfer interface 12. Specific programs are provided for different vehicle types. The control behavior of the control unit 10 can be modified by the driver via an operating unit 17, for. B. to give the sound of the vehicle a sporty or gentle touch or to make the vehicle noise quieter or louder.
  • the sensor system comprises a direct coupling of the control unit 10 with a motor control electronics 20, a temperature sensor 21 and a microphone 22, which are attached to the air intake duct.
  • the signal transmission takes place via suitable signal lines 27.
  • the temperature sensor 21 receives the temperature of the intake air flow AS in the pipeline 2 in the immediate vicinity of the loudspeaker 3. It is designed to withstand intake air.
  • the also intake air-resistant microphone 22 is inserted downstream of the speaker 3 in a second opening 24 in the wall 5 of the air intake duct 2.
  • an operating unit 17 is provided. This is arranged so that it can be operated by the driver while driving. It comprises switch 25 and rotary control 26.
  • the control unit 17 is coupled to the control unit 10 via a signal line 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
EP06003126A 2005-04-25 2006-02-16 Silencieux d'admission actif Withdrawn EP1717433A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102005019459A DE102005019459B3 (de) 2005-04-25 2005-04-25 Aktiver Ansaugschalldämpfer

Publications (3)

Publication Number Publication Date
EP1717433A2 EP1717433A2 (fr) 2006-11-02
EP1717433A9 true EP1717433A9 (fr) 2006-12-13
EP1717433A3 EP1717433A3 (fr) 2011-06-22

Family

ID=36589199

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06003126A Withdrawn EP1717433A3 (fr) 2005-04-25 2006-02-16 Silencieux d'admission actif

Country Status (3)

Country Link
US (1) US20060236973A1 (fr)
EP (1) EP1717433A3 (fr)
DE (1) DE102005019459B3 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007103215A1 (fr) * 2006-03-02 2007-09-13 Pacbrake Company Ensemble silencieux a haute performance dote de multiples modes de fonctionnement
JP2008002318A (ja) * 2006-06-21 2008-01-10 Nissan Motor Co Ltd 車両の吸気音導入装置
DE102010042679A1 (de) * 2010-10-20 2012-04-26 J. Eberspächer GmbH & Co. KG Schalldämpfer
DE102011009738A1 (de) 2011-01-28 2012-08-02 Benteler Automobiltechnik Gmbh Stabilisatorkupplung
DE102011000412A1 (de) * 2011-01-31 2012-08-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kolbenmotor
CH704823A1 (de) 2011-04-01 2012-10-15 Alstom Technology Ltd Ansaugkrümmer für eine Gasturbine sowie Gasturbine.
US9025786B2 (en) 2011-06-01 2015-05-05 Eberspaecher Exhaust Technology Gmbh & Co. Kg Active noise control system for exhaust systems and method for controlling the same
US10142718B2 (en) 2014-12-04 2018-11-27 Invensense, Inc. Integrated temperature sensor in microphone package
US9706322B2 (en) * 2015-03-26 2017-07-11 Honda Motor Co., Ltd. System and method for leak detection in an engine sound transportation passageway
DE102015112087A1 (de) 2015-07-24 2017-01-26 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren und Steuereinrichtung zur Beeinflussung von Ansauggeräuschen
CN108109810B (zh) * 2017-11-29 2024-04-16 无锡澳蓝特环保科技有限公司 复合型进气箱
CN108386250A (zh) * 2018-02-28 2018-08-10 成英 用于车辆消声装置的驻波管采集消声谐振工作方法
DE102018113500A1 (de) * 2018-06-06 2019-12-12 Technische Universität Kaiserslautern Elektrodynamischer Lautsprecher
US11568845B1 (en) * 2018-08-20 2023-01-31 Board of Regents for the Oklahoma Agricultural & Mechanical Colleges Method of designing an acoustic liner

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Also Published As

Publication number Publication date
EP1717433A2 (fr) 2006-11-02
US20060236973A1 (en) 2006-10-26
EP1717433A3 (fr) 2011-06-22
DE102005019459B3 (de) 2006-07-13

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