EP1221158A1 - Procede et dispositif pour influer de maniere active sur le bruit d'admission d'un moteur a combustion interne - Google Patents

Procede et dispositif pour influer de maniere active sur le bruit d'admission d'un moteur a combustion interne

Info

Publication number
EP1221158A1
EP1221158A1 EP00962457A EP00962457A EP1221158A1 EP 1221158 A1 EP1221158 A1 EP 1221158A1 EP 00962457 A EP00962457 A EP 00962457A EP 00962457 A EP00962457 A EP 00962457A EP 1221158 A1 EP1221158 A1 EP 1221158A1
Authority
EP
European Patent Office
Prior art keywords
noise
signal
internal combustion
combustion engine
intake
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Withdrawn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
EP00962457A
Other languages
German (de)
English (en)
Inventor
Rolf Füsser
Franc Pricken
Rolf Schirmacher
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.)
Mann and Hummel GmbH
Original Assignee
Filterwerk Mann and Hummel 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 Filterwerk Mann and Hummel GmbH filed Critical Filterwerk Mann and Hummel GmbH
Publication of EP1221158A1 publication Critical patent/EP1221158A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G10K11/1787—General system configurations
    • G10K11/17879—General system configurations using both a reference signal and an error signal
    • G10K11/17883—General system configurations using both a reference signal and an error signal the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
    • 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
    • G10K11/1783—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions
    • G10K11/17833—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 handling or detecting of non-standard events or conditions, e.g. changing operating modes under specific operating conditions by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
    • 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
    • G10K11/1785—Methods, e.g. algorithms; Devices
    • G10K11/17857—Geometric disposition, e.g. placement of microphones
    • 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
    • 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
    • G10K2210/30—Means
    • G10K2210/301—Computational
    • G10K2210/3014—Adaptive noise equalizers [ANE], i.e. where part of the unwanted sound is retained

Definitions

  • the invention relates to a method for actively influencing the intake noise of an internal combustion engine, in which a correction noise is generated by an electromechanical transducer, which is superimposed on the intake noise, according to the preamble of claim 1.
  • the invention relates to a device for performing the above method is suitable according to the preamble of patent claim 3.
  • the active influencing of the intake noise of an internal combustion engine e.g. B. through a speaker is known.
  • a possible circuit arrangement with a suitable electronic control system is shown in US Pat. No. 5,321,759.
  • the controller receives at least one speed signal 44 from the internal combustion engine 10, which is processed in the electronic controller 26.
  • other sizes such as. B. the position 18 of a throttle valve 16, are included in the computing process of the electronic control.
  • the controller 26 calculates an output signal which is converted by a loudspeaker 28 into a noise which is superimposed on the intake noise. This measure is carried out for the purpose of reducing the intake noise. This takes advantage of the fact that a further tes spectrum of the intake noise emanating from the internal combustion engine depends directly on the speed, the frequency of the noise resulting from different multiples of the speed. By radiating the noise determined by the control into the intake tract through the loudspeaker 28, the corresponding partial noise in the intake pipe can be reduced. Ideally, the noise emitted by the loudspeaker 28 therefore requires an opposite amplitude of the same amount, so that the corresponding noise component is deleted.
  • an error microphone 30 is also installed in the intake tract, which records the intake noise influenced by the loudspeaker 28.
  • the correspondingly filtered signal of the error microphone 30 gives the control system information about the degree of noise minimization in the intake tract, so that the output signal for the loudspeaker 28 can be varied with regard to an optimized noise reduction.
  • the object of the invention is therefore to provide a method and a device for carrying out this method, whereby an active influence on the intake noise of an internal combustion engine is possible, the degree of influence on the intake noise being selectable.
  • This object is achieved by the features of method claim 1.
  • a device for carrying out the method according to claim 1 is also claimed according to claim 3.
  • the z. B. can consist of a speaker and generates a correction sound, provided. This is attached so that the intake noise can be superimposed. That can e.g. B. can be ensured that the speaker is attached to the outer wall of the intake tract and radiates into the interior of the intake manifold.
  • the loudspeaker outside the intake system in the engine compartment. The only important thing here is that the emitted sound waves from the loudspeaker can be superimposed with the intake noise.
  • a sensor in particular a microphone, is provided, which is attached in the engine compartment or in the intake tract in such a way that it can register the intake noise of the internal combustion engine superimposed with the correction noise of the electromechanical transducer.
  • Both the electromechanical converter and the sensor are connected to a controller, which continues to process at least one speed signal from the internal combustion engine.
  • the frequency, amplitude and phase of the output signal are modified, by means of which the electromechanical converter is controlled.
  • the speed signal can be generated by a specially provided sensor, which is connected to the control.
  • Modern internal combustion engines have engine management, which also ensures the utilization of the speed signal. This system can be tapped for speed information, which saves an additional speed sensor.
  • the electromechanical transducer can be implemented using an appropriately dimensioned loudspeaker. With a clever design of the overall system, this can, for. B. a commercially available loudspeaker with a diameter of 15 cm, which is attached to the raw air line.
  • the control sensor can be formed by a simple electret microphone. This develops its effect particularly well when it is placed near the intake opening of the intake system.
  • the electronic control unit is preferably formed by a signal processor system in which the functional units of the control are digitally simulated. This enables a very small, integrated and inexpensive implementation of the system.
  • the signal processor system can also be implemented by an analog computing circuit.
  • the actual noise which results from the superimposition of the intake noise with the correction noise
  • a target noise is aimed at achieving a desired sound on the intake tract of the internal combustion engine, and can therefore also be different from 0.
  • the control can modify the characteristic of the correction noise in such a way that it is approximated with the intake noise of the internal combustion engine to the desired target noise.
  • the desired target noise must be made available to the control in some way. This can in particular also be determined as a function of the speed of the internal combustion engine, which is advantageous because the intake noise is mainly speed-dependent for the reasons already described. In this way, intake noise can be generated as actual noise.
  • the objective can be both to reduce the intake noise and, in certain cases, to increase the intake noise. Whether a decrease or an increase is effected depends on the phase position of the correction noise in relation to the intake noise.
  • the amount of increase or decrease in the intake noise can be influenced by the amplitude of the correction noise and is limited by the speaker power.
  • the frequency of the correction noise depends directly on the speed of the internal combustion engine.
  • the comparison of the actual noise with a desired target noise can be advantageously used in various ways.
  • a strong suction noise for the complete erasure of which the performance of the loudspeaker would not be sufficient, can be transformed into a more moderate suction noise that is more tolerable for human perception.
  • the driver of the vehicle needs acoustic feedback to the engine in certain operating states. This is e.g. B. necessary to determine the correct time for changing gears.
  • the intake noise of the internal combustion engine can be influenced directly, for. B. by a degressive intake noise reduction in higher speed ranges.
  • the target noise can also be influenced with regard to a sporty sound of the internal combustion engine. This means that there are applications in the area of so-called sound design.
  • a device for performing the described method is claimed in claim 3. This device must have at least the following components.
  • a control is necessary which can process the speed signal D of the internal combustion engine in order to generate a control signal A as a function thereof.
  • the control signal A serves to actuate the electromechanical transducer, in particular the loudspeaker, to generate the correction noise.
  • the control must receive information about the target noise signal S and the actual noise signal I.
  • the target noise signal is used by the controller for comparison with the actual noise signal, so that the deviation can be determined.
  • the actual noise signal is composed of the superimposition of the intake noise with the correction noise, as has already been described.
  • the target noise signal corresponds to a target noise which is to be generated by the correction noise influencing the intake noise.
  • a speed sensor is generally connected to this interface and can also be integrated in the engine management. Such a sensor generally already delivers a speed signal, which may have to be converted into the speed signal D.
  • a sensor must also be provided to detect the actual noise.
  • the sensor then provides a corresponding actual noise signal I, which can be processed in the control.
  • the device described means a minimal outlay on components for actively influencing the intake noise.
  • the control is preferably formed by a digital computer.
  • the signals must be converted accordingly into analog or digital form.
  • the control signal may have to be amplified in order to achieve the desired amplitudes of the loudspeaker vibrations for generating the correction noise.
  • a first means is provided for generating the frequency-dependent control signal D in terms of its frequency.
  • This can be, for. B. is a generator for a sinusoidal control signal.
  • a second means is used to adjust the magnitude and phase of the control signal A as a function of a comparison signal V.
  • the comparison signal V represents the result of the comparison of the actual noise signal I and the target noise signal S. It thus shows the deviation of the actual noise from the desired target noise.
  • the magnitude and phase of the control signal are corrected, resulting in a further approximation of the actual noise to the target noise.
  • an additive to take into account the acoustic transfer function between the transducer and sensor can be helpful. This allows free choice for the installation location of the electromechanical transducer and sensor. The transfer function is therefore a constant parameter dependent on the system.
  • a third means for generating the target noise signal S is provided.
  • This means can also be integrated in the computer of the control.
  • At least the speed signal D is processed as an input variable, with the aid of which a speed-dependent target noise signal S can be generated.
  • other engine parameters can also be included in this calculation.
  • B the position of the accelerator pedal, the gear selected in the transmission or the throttle already mentioned.
  • a fourth means is provided in order to form a comparison signal from the actual noise signal and the target noise signal. This is preferably done by forming their difference, which enables statements to be made about the deviation between the actual and target noise. In this way, the comparison signal V is generated, which is used to influence the control signal A.
  • control signals sinusoidally. These can then be adapted to the higher orders of the speed-dependent engine noise. If several orders of engine noise are to be influenced, the device must be cascaded. This means that the first and second means of control multiple times in parallel in the control be arranged. Each parallel arrangement is responsible for the generation of a special control signal A or for the adjustment of its magnitude and phase.
  • the control signals are then combined by a fifth means for addition, so that their superimposition can be passed on to the third means for generating the target noise signal. In this way, the electromechanical transducer can then be controlled.
  • Figure 1 shows the arrangement of the device on the internal combustion engine as
  • FIG. 2 shows a possible structure of the controller according to Figure 1 as
  • FIG. 10 An internal combustion engine 10 is shown schematically in FIG. This has an intake tract 11 with a throttle valve 12 and an exhaust system 13. The direction of the intake air and the exhaust gas is indicated by arrows.
  • An electromechanical transducer 14 which is designed here as a loudspeaker, is also arranged in the intake tract.
  • a sensor 16 here embodied as a microphone, is attached to an intake port 15.
  • a controller 17 is provided, to which an actual noise signal I picked up by the sensor 16 and a speed signal D picked up by the internal combustion engine 10 are fed.
  • the speed signal can e.g. B. measured by a speed sensor 18. It is also possible to measure the throttle valve angle with the aid of a position sensor 19. This generates a further parameter P, which can also be processed by the controller 17.
  • the controller 17 generates a control signal A tot , which is converted into a correction noise 20 by the electromechanical converter 14. This is superimposed on the intake noise 21 of the internal combustion engine, which propagates through the intake tract 11. This results in an actual noise 22 which, for. B. can be measured on the intake manifold 15 by the sensor 16. This results in the actual noise signal I.
  • the controller 17 is constructed as a digital computer.
  • the control signal A tot must therefore be converted by a digital-to-analog converter 24 into an analog signal, with the aid of which the electromechanical converter 14 can be controlled.
  • This embodiment represents the cheapest variant in terms of component complexity, manufacturing costs and the reliability of the device.
  • the construction of the control 17 as an analog computer is equally conceivable.
  • the signals are processed analogously and may have to be converted into analog signals beforehand (depending on whether the sensors deliver digital or analog signals).
  • the control signal Ag es which is provided by an analog control 17, then no longer has to be converted. Possibly. an amplification of the control signal A ges is still necessary. This may be done by an amplifier 23.
  • FIG. 2 An example of the structure of the control 17 can be seen in FIG. 2.
  • This controller has an interface 25a, b for the input of the speed signal D from the internal combustion engine. Via the interface 25a, the speed signal D can be processed by a first means 26 for generating a speed-dependent control signal A.
  • a third means 27 is also supplied with the speed signal D via the interface 25b. This third means is provided for generating a target noise signal S. Via the interfaces 25c further parameters, such as. B. information about the position of the throttle valve 12 or the position of the accelerator pedal or the gear engaged or about the air mass supplied to the internal combustion engine can be fed into the third means.
  • a fourth means 28 is provided for generating a comparison signal V. The comparison signal is calculated by forming the difference between the target noise signal S and the actual noise signal I, which is fed to the control system via an interface 25d.
  • the already mentioned first means 26 generates the control signal A.
  • the speed signal D of the internal combustion engine already flows in when this control signal is generated.
  • the first means 26 is provided twice in the control according to the exemplary embodiment. In this way, two orders of the speed-dependent intake noise can be influenced directly. In the manner shown, the system can be cascaded for any number of orders.
  • the first means is followed by a second means 29 for adjusting the amount and phase of the control signal A.
  • the comparison signal V is used, which represents a measure of the deviation of the actual noise 22 from a target noise corresponding to the target noise signal S.
  • the comparison signal V is multiplied by the controlled with the transfer function H A control signal H, where this results in a measure of the variation of magnitude and phase of the control signal A.
  • the transfer function H results from the geometric and acoustic conditions of the application and can be a constant. It arises from the fact that the intake noise 21 superimposed with the correction noise 20 is subject to a change, as recorded by the sensor 16 as the actual noise 22, which is described by the transfer function H.
  • the transfer function H is stored in an additional means 30 and is made available to the second means 29.
  • the second means 29 each deliver a control signal A defined in frequency, amplitude and phase position. These control signals are added by a fifth means 31 and in this way result in the control signal A tot relevant for the electromechanical transducer - the fifth means 31 is therefore only in the case cascading on several engine orders necessary. The basic structure of the device remains unaffected. In any case, the control system delivers a control signal A or A total which is intended to control the electromechanical converter.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Exhaust Silencers (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour influer de manière active sur le bruit d'admission d'un moteur à combustion interne. Le dispositif pour mettre en oeuvre ledit procédé comprend un organe de régulation (7) qui enregistre le bruit réel (I) au moyen d'un microphone (16) et le compare à un signal de bruit prescrit dépendant du régime (D). D'autres paramètres P, tels que la position du papillon (12), peuvent également être pris en compte. La comparaison du bruit prescrit et du bruit réel permet de produire un signal de référence qui influe sur un signal de régulation Ages, ce dernier étant également fonction du régime du moteur à combustion interne. Ce signal de régulation Ages est acheminé à un haut-parleur (14) qui produit un bruit de correction (20). La superposition de ce dernier au bruit d'admission (21) a pour effet de produire le bruit réel (22), qui doit correspondre le plus possible au bruit prescrit. Il est ainsi possible non seulement de réduire le bruit d'admission mais aussi d'adapter ce dernier à un son prescrit souhaité. De même, il est possible de concevoir librement le bruit d'admission dans le cadre de la puissance du haut-parleur, ce qui permet de donner un retour d'information acoustique au conducteur du véhicule, par ex. dans des états de fonctionnement déterminés.
EP00962457A 1999-10-15 2000-09-08 Procede et dispositif pour influer de maniere active sur le bruit d'admission d'un moteur a combustion interne Withdrawn EP1221158A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19949685A DE19949685A1 (de) 1999-10-15 1999-10-15 Verfahren und Vorrichtung zur aktiven Beeinflussung des Ansauggeräusches einer Brennkraftmaschine
DE19949685 1999-10-15
PCT/EP2000/008775 WO2001029819A1 (fr) 1999-10-15 2000-09-08 Procede et dispositif pour influer de maniere active sur le bruit d'admission d'un moteur a combustion interne

Publications (1)

Publication Number Publication Date
EP1221158A1 true EP1221158A1 (fr) 2002-07-10

Family

ID=7925722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00962457A Withdrawn EP1221158A1 (fr) 1999-10-15 2000-09-08 Procede et dispositif pour influer de maniere active sur le bruit d'admission d'un moteur a combustion interne

Country Status (5)

Country Link
US (1) US6688422B2 (fr)
EP (1) EP1221158A1 (fr)
JP (1) JP2003512575A (fr)
DE (1) DE19949685A1 (fr)
WO (1) WO2001029819A1 (fr)

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Also Published As

Publication number Publication date
WO2001029819A1 (fr) 2001-04-26
JP2003512575A (ja) 2003-04-02
US6688422B2 (en) 2004-02-10
DE19949685A1 (de) 2001-04-19
US20020164038A1 (en) 2002-11-07

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