FR2783563A1 - Automobile exhaust noise reduction system, uses an analogue - digital noise converter and computer interruption stage - Google Patents

Automobile exhaust noise reduction system, uses an analogue - digital noise converter and computer interruption stage Download PDF

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Publication number
FR2783563A1
FR2783563A1 FR9811880A FR9811880A FR2783563A1 FR 2783563 A1 FR2783563 A1 FR 2783563A1 FR 9811880 A FR9811880 A FR 9811880A FR 9811880 A FR9811880 A FR 9811880A FR 2783563 A1 FR2783563 A1 FR 2783563A1
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FR
France
Prior art keywords
noise
computer
function
analogue
signal
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
FR9811880A
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French (fr)
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FR2783563B1 (en
Inventor
Vincent Fortoul
Christian Charles Garabedian
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.)
ECIA Equipements et Composants pour lIndustrie Automobile SA
Original Assignee
ECIA Equipements et Composants pour lIndustrie Automobile SA
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.)
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Publication date
Application filed by ECIA Equipements et Composants pour lIndustrie Automobile SA filed Critical ECIA Equipements et Composants pour lIndustrie Automobile SA
Priority to FR9811880A priority Critical patent/FR2783563B1/en
Priority to DE19945696A priority patent/DE19945696B4/en
Publication of FR2783563A1 publication Critical patent/FR2783563A1/en
Application granted granted Critical
Publication of FR2783563B1 publication Critical patent/FR2783563B1/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/06—Silencing apparatus characterised by method of silencing by using interference effect
    • F01N1/065—Silencing apparatus characterised by method of silencing by using interference effect by using an active noise source, e.g. speakers
    • 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
    • G10K11/1787—General system configurations
    • G10K11/17875—General system configurations using an error signal without a reference signal, e.g. pure feedback
    • 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
    • G10K2210/12822—Exhaust pipes or mufflers
    • 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
    • G10K2210/3031—Hardware, e.g. architecture

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (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)

Abstract

The vehicle exhaust silencing circuit has a microphone (2), to control residual exhaust system noise, connected to a anti-noise computer (3) through a noise signal analogue-digital converter (4). The computer actuates an anti-noise function (11) to generate an anti-noise signal for driving an electro-acoustic transducer, with loudspeaker, (6) which generates noise in the exhaust system. The system is of the type having a microphone (2), to control residual exhaust system noise, connected to an anti-noise computer (3) through a noise signal analogue-digital converter (4). The computer (3) is designed to actuate an anti-noise function (11) in order to generate an anti-noise signal for driving an electro-acoustic transducer, with loudspeaker, (6) which generates noise in the exhaust system. The system has also a noise management unit (7), see Fig. 2. The analogue-digital converter (4) is designed to generate, at the end of each conversion, an interrupt signal (INT) for the anti-noise computer (3), so as allow the latter to engage an interruption regime during it proceeds to acquire numeric data from the converter output, then lunches the anti-noise function (11).

Description

La présente invention concerne un système anti-bruit pour ligneThe present invention relates to an anti-noise system for line

d'échappement de véhicule automobile.  motor vehicle exhaust.

On connaît déjà dans l'état de la technique, des systèmes anti-bruit pour ligne d'échappement qui comportent des moyens de relevé de bruit résiduel de ligne, raccordés à un calculateur d'anti-bruit à travers des moyens de conver- sion analogique/numérique du signal de bruit, le calculateur étant adapté pour mettre en oeuvre une fonction d'anti-bruit afin de générer un signal d'anti-bruit de  There are already known in the prior art, anti-noise systems for exhaust lines which include means for recording residual line noise, connected to an anti-noise computer through conversion means. analog / digital noise signal, the computer being adapted to implement an anti-noise function in order to generate an anti-noise signal of

pilotage de moyens à transducteur électro-acoustique de génération d'un anti-  control of means with electro-acoustic transducer for generating an anti-

bruit de ligne.line noise.

Ces systèmes ont été développés pour réduire le niveau des nuisan-  These systems have been developed to reduce the level of nuisance

ces sonores liées au fonctionnement des moteurs des véhicules.  these sounds related to the operation of vehicle engines.

Le calculateur d'anti-bruit fonctionne de manière classique pour en-  The noise canceling calculator works in a conventional manner to

gendrer un signal d'anti-bruit à partir d'un bruit résiduel de ligne.  generate an anti-noise signal from residual line noise.

Ce signal d'anti-bruit commande alors par exemple le fonctionnement  This anti-noise signal then controls for example the operation

de moyens à transducteur électro-acoustique tels qu'un haut-parleur, de généra-  electro-acoustic transducer means such as a loudspeaker, generally

tion d'un anti-bruit de ligne, ces moyens à haut-parleur étant par exemple asso-  tion of a line noise canceling device, these loudspeaker means being for example

ciés d'une façon ou d'une autre à la ligne d'échappement.  somehow to the exhaust line.

On conçoit cependant que la charge de travail imposée à ce calcula-  However, it can be seen that the workload imposed on this calculation

teur est extrêmement importante, ce qui peut se traduire par des dysfonctionne-  is extremely important, which can lead to dysfunctions.

ments du système anti-bruit, liés au temps de réaction du calculateur.  the anti-noise system, linked to the reaction time of the computer.

Le but de l'invention est donc de résoudre ces problèmes.  The object of the invention is therefore to solve these problems.

A cet effet, I'invention a pour objet un système anti-bruit pour ligne  To this end, the invention relates to an anti-noise system for line

d'échappement de véhicule automobile, du type comportant des moyens de rele-  motor vehicle exhaust, of the type comprising means for relieving

vé de bruit résiduel de ligne, raccordés à un calculateur d'anti-bruit à travers des moyens de conversion analogique/numérique du signal de bruit, le calculateur étant adapté pour mettre en oeuvre une fonction d'anti-bruit afin de générer un signal d'anti-bruit de pilotage de moyens à transducteur électro-acoustique de  of residual line noise, connected to an anti-noise computer by means of analog / digital conversion of the noise signal, the computer being adapted to implement an anti-noise function in order to generate a signal anti-noise control of electro-acoustic transducer means

génération d'un anti-bruit de ligne et une fonction de gestion du système anti-  generation of line noise canceling and anti-system management function

bruit, caractérisé en ce que les moyens de conversion analogique/numérique  noise, characterized in that the analog / digital conversion means

sont adaptés pour engendrer, à la fin de chaque conversion, un signal d'inter-  are adapted to generate, at the end of each conversion, an inter-

ruption du calculateur d'anti-bruit, pour amener celui-ci à engager une routine  break the noise canceling computer, to cause it to start a routine

d'interruption au cours de laquelle il procède à l'acquisition des informations nu-  during which he acquires the nu-

mériques de sortie du convertisseur puis lance la fonction d'anti-bruit.  output converter then starts the noise canceling function.

L'invention sera mieux comprise à l'aide de la description qui va sui-  The invention will be better understood with the aid of the description which follows.

vre, donnée uniquement à titre d'exemple et faite en se référant aux dessins an-  vre, given only by way of example and made with reference to the drawings an-

nexés, sur lesquels: - la Fig.1 représente un schéma synoptique illustrant la structure d'un système anti-bruit pour ligne d'échappement selon l'invention; et - la Fig.2 illustre le fonctionnement d'un calculateur entrant dans la  attached, in which: - Fig.1 shows a block diagram illustrating the structure of an anti-noise system for exhaust system according to the invention; and - Fig.2 illustrates the operation of a computer entering the

constitution d'un tel système.constitution of such a system.

On reconnaît en effet sur la figure 1, un système anti-bruit pour ligne  In fact, in FIG. 1, an anti-noise system for the line is recognized

d'échappement de véhicule automobile, cette ligne d'échappement étant dési-  motor vehicle exhaust, this exhaust line being desi-

gnée par la référence générale 1.  hindered by the general reference 1.

Ce système comporte de façon classique des moyens de relevé de bruit résiduel de ligne, désignés par la référence générale 2 sur cette figure,  This system conventionally comprises means for recording residual line noise, designated by the general reference 2 in this figure,

comportant par exemple tout microphone approprié.  including, for example, any suitable microphone.

Ces moyens sont raccordés à un calculateur anti-bruit désigné par la référence générale 3 sur cette figure 1, à travers des moyens de conversion  These means are connected to an anti-noise computer designated by the general reference 3 in this FIG. 1, through conversion means.

analogique/numérique du signal de bruit, désignés par la référence générale 4.  analog / digital noise signal, designated by general reference 4.

Le calculateur est alors adapté pour mettre en oeuvre une fonction  The computer is then adapted to implement a function

d'anti-bruit afin de générer un signal d'anti-bruit de pilotage de moyens à trans-  anti-noise in order to generate an anti-noise signal for controlling means to trans-

ducteur électro-acoustique de génération d'un anti-bruit de ligne et une fonction  electroacoustic conductor for generating a line noise canceling function

de gestion du système anti-bruit.management of the anti-noise system.

C'est ainsi que la sortie du calculateur 3 est par exemple reliée à des  This is how the output of the computer 3 is for example connected to

moyens formant interface désignés par la référence générale 5, eux-mêmes rac-  interface means designated by the general reference 5, themselves connected

cordés aux moyens à transducteur électro-acoustique associés à la ligne  strung to means with electro-acoustic transducer associated with the line

d'échappement et désignés par la référence générale 6.  exhaust and designated by the general reference 6.

Ces moyens d'interface comprennent par exemple des moyens d'am-  These interface means include, for example,

plification de puissance tandis que les moyens à transducteur électroacoustique  power plication while the electroacoustic transducer means

6 comprennent par exemple des moyens à haut-parleur.  6 include for example speaker means.

Comme cela est illustré sur la figure 2, ce calculateur 3 est donc adapté pour gérer le fonctionnement du système comme cela est illustré par  As illustrated in FIG. 2, this computer 3 is therefore suitable for managing the operation of the system as illustrated by

l'étape désignée par la référence générale 7 sur cette figure.  the stage designated by the general reference 7 in this figure.

Cependant, à la fin de chaque conversion numérique/analogique par le convertisseur 4, comme cela est illustré par l'étape désignée par la référence  However, at the end of each digital / analog conversion by the converter 4, as illustrated by the step designated by the reference

générale 8, ce convertisseur engendre un signal d'interruption INT. du calcula-  general 8, this converter generates an INT interrupt signal. of the calculation

teur d'anti-bruit 3 pour amener celui-ci à engager une routine d'interruption dési-  anti-noise counter 3 to cause the latter to initiate a desired interrupt routine

gnée par la référence générale 9 sur cette figure 2, au cours de laquelle ce cal-  hindered by the general reference 9 in this figure 2, during which this cal-

culateur procède à l'acquisition des informations numériques de sortie du con-  culator acquires digital output information from the con-

vertisseur comme cela est illustré par l'étape désignée par la référence générale , puis lance la fonction d'anti-bruit comme cela est désignée par la référence générale 11 sur cette figure.  vertisseur as illustrated by the step designated by the general reference, then launches the anti-noise function as designated by the general reference 11 in this figure.

Ceci permet alors d'améliorer le fonctionnement de ce système.  This then improves the operation of this system.

Il va de soi bien entendu que d'autres modes de réalisation encore  It goes without saying of course that still other embodiments

d'un tel système peuvent être envisages.  of such a system can be envisaged.

Claims (3)

REVENDICATIONS 1. Système anti-bruit pour ligne d'échappement de véhicule automo-  1. Anti-noise system for motor vehicle exhaust line bile, du type comportant des moyens (2) de relevé de bruit résiduel de ligne rac-  bile, of the type comprising means (2) for detecting residual line noise cordés à un calculateur d'anti-bruit (3) à travers des moyens de conversion ana-  connected to an anti-noise calculator (3) through analog conversion means logique/numérique (4) du signal de bruit, le calculateur (3) étant adapté pour  logic / digital (4) of the noise signal, the computer (3) being adapted for mettre en oeuvre une fonction d'anti-bruit (11) afin de générer un signal d'anti-  implementing an anti-noise function (11) in order to generate an anti-noise signal bruit de pilotage de moyens (6) à transducteur électro-acoustique de génération  piloting noise of means (6) with electro-acoustic generation transducer d'un anti-bruit de ligne et une fonction (7) de gestion du système antibruit, ca-  line noise canceling and a function (7) for managing the noise canceling system, ractérisé en ce que les moyens de conversion analogique/numérique (4) sont adaptés pour engendrer, à la fin de chaque conversion, un signal d'interruption (INT.) du calculateur d'anti-bruit (3), pour amener celuici à engager une routine  characterized in that the analog / digital conversion means (4) are adapted to generate, at the end of each conversion, an interrupt signal (INT.) from the anti-noise computer (3), to bring it to initiate a routine d'interruption (9) au cours de laquelle il procède à l'acquisition (10) des informa-  interruption (9) during which it acquires (10) the information tions numériques de sortie du convertisseur puis lance la fonction d'anti-bruit (11).  digital output from the converter then starts the noise canceling function (11). 2. Système selon la revendication 1, caractérisé en ce que les moyens2. System according to claim 1, characterized in that the means à transducteur électro-acoustique (6) comprennent des moyens à hautparleur.  with electro-acoustic transducer (6) comprise loudspeaker means. 3. Système selon l'une quelconque des revendications précédentes,  3. System according to any one of the preceding claims, caractérisé en ce que les moyens de relevé de bruit résiduel de ligne (2) com-  characterized in that the means for detecting residual line noise (2) comprises prennent un microphone.take a microphone.
FR9811880A 1998-09-23 1998-09-23 ANTI-NOISE SYSTEM FOR A MOTOR VEHICLE EXHAUST LINE Expired - Fee Related FR2783563B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9811880A FR2783563B1 (en) 1998-09-23 1998-09-23 ANTI-NOISE SYSTEM FOR A MOTOR VEHICLE EXHAUST LINE
DE19945696A DE19945696B4 (en) 1998-09-23 1999-09-23 Silencer system for exhaust systems of motor vehicles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9811880A FR2783563B1 (en) 1998-09-23 1998-09-23 ANTI-NOISE SYSTEM FOR A MOTOR VEHICLE EXHAUST LINE

Publications (2)

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FR2783563A1 true FR2783563A1 (en) 2000-03-24
FR2783563B1 FR2783563B1 (en) 2000-12-15

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FR9811880A Expired - Fee Related FR2783563B1 (en) 1998-09-23 1998-09-23 ANTI-NOISE SYSTEM FOR A MOTOR VEHICLE EXHAUST LINE

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FR (1) FR2783563B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007046584B4 (en) 2007-09-27 2016-10-20 Robert Bosch Gmbh Method and control device for controlling a vehicle drive system of a vehicle

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386472A (en) * 1990-08-10 1995-01-31 General Motors Corporation Active noise control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5222148A (en) * 1992-04-29 1993-06-22 General Motors Corporation Active noise control system for attenuating engine generated noise
JPH06242787A (en) * 1993-02-17 1994-09-02 Fujitsu Ltd Sneaking sound control type active noise elimiation device

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386472A (en) * 1990-08-10 1995-01-31 General Motors Corporation Active noise control system

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DE19945696A1 (en) 2000-04-27
DE19945696B4 (en) 2008-11-06
FR2783563B1 (en) 2000-12-15

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