EP0256325B1 - Filtre d'élimination des particules de suie, en particulier dans le courant des gas d'échappement d'un moteur diesel - Google Patents

Filtre d'élimination des particules de suie, en particulier dans le courant des gas d'échappement d'un moteur diesel Download PDF

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Publication number
EP0256325B1
EP0256325B1 EP87110439A EP87110439A EP0256325B1 EP 0256325 B1 EP0256325 B1 EP 0256325B1 EP 87110439 A EP87110439 A EP 87110439A EP 87110439 A EP87110439 A EP 87110439A EP 0256325 B1 EP0256325 B1 EP 0256325B1
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EP
European Patent Office
Prior art keywords
soot
converter according
housing
soot particles
pipe
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.)
Expired - Lifetime
Application number
EP87110439A
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German (de)
English (en)
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EP0256325A3 (en
EP0256325A2 (fr
Inventor
Christian Bergemann
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT87110439T priority Critical patent/ATE69087T1/de
Publication of EP0256325A2 publication Critical patent/EP0256325A2/fr
Publication of EP0256325A3 publication Critical patent/EP0256325A3/de
Application granted granted Critical
Publication of EP0256325B1 publication Critical patent/EP0256325B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
    • B03C3/155—Filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/01—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust by means of electric or electrostatic separators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/04—Ionising electrode being a wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/30—Details of magnetic or electrostatic separation for use in or with vehicles
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/10—Fibrous material, e.g. mineral or metallic wool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a soot converter for the removal of soot particles from the exhaust gas of an internal combustion engine, in particular a diesel engine, with an exhaust gas supply or exhaust gas outlet arranged at one end of a tubular housing and with a housing which is electrically insulated with respect to the ground potential and extends in the longitudinal direction thereof Spray electrode.
  • soot particles retained by the filter are burned to non-toxic carbon dioxide by the exhaust gas heat.
  • the mechanical filters cause a permanent loss of pressure and power by interrupting the exhaust gas flow.
  • the temperatures of 450 to 600 ° C required for soot combustion can only rarely be reached by the exhaust gas heat. Blockage of the filter and blocking of the exhaust gas flow therefore occur, which not only results in performance losses, but can also lead to engine shutdown.
  • the exhaust gas temperature is increased by adding additional fuel (cf. emission reduction of automobile exhaust gases - diesel engines - VDI report 559, VDI Verlag Düsseldorf, pages 139 to 156).
  • Gravity separation is also known to reduce soot emissions; this requires an electrostatic grain enlargement of the soot particles.
  • An electrostatic field causes the soot particles to agglomerate; the aggregated soot particles can be collected in a container. The collected soot is then fed into the combustion chamber of the engine and burned there.
  • the effective reduction of the soot in the exhaust gas flow requires, in view of the large amounts of soot that accumulate, a collecting container with a corresponding holding capacity; due to lack of space and free space, a large-volume collection container, in particular for diesel motor vehicles, can hardly be realized, at best only with great effort.
  • the migration and penetration of the soot particles into the waveguide is greater due to that compared to the waveguide Suction electrode having voltage potential reinforced. This is because a second electric field, also directed outwards, is created in the waveguide, the highest electric field strength being in the center of the waveguide, ie on the surface of the wire-shaped suction electrode; the suction electrode attracts the charged soot particles.
  • a gas flow opposite to the exhaust gas flow flows through the waveguide, entrains the agglomerates concentrated therein and transports them into the combustion chamber of the diesel engine for post-combustion.
  • FR-A 701 007 which corresponds to the preamble of claim 1, to reduce the pollutant emission of an internal combustion engine by exposing the exhaust gas flow to an electrostatic field.
  • the electrostatic field is generated by means of a wire electrode, which is guided longitudinally through a tubular housing and is arranged between insulators, and the soot is separated on the wall of the housing.
  • fresh air is additionally mixed into the exhaust gases flowing through the electrostatic field in the housing.
  • JP-A 55-96597 is known from JP-A 55-96597.
  • JP-A-58 132 295 discloses a sound-absorbing and catalytically active coating for silencers in automobiles. As in the document mentioned above, the use of a high-voltage field is not intended.
  • US-A-3 683 624 shows a very complicated structure of an exhaust gas cleaner, in which both electrostatic soot separation and filtering of the exhaust gas take place in several successive chambers.
  • the device according to US Pat. No. 4,406,119 is similar, in which an ionization stage, a filter stage and a cyclone separation stage are connected in series in the exhaust line of a diesel engine. Apart from the enormous space requirement, such arrangements are also out of the question because of the correspondingly high costs for practical use.
  • the invention has for its object to provide a soot converter for the removal of soot particles from the exhaust gas of an internal combustion engine, in particular a diesel engine, without the above disadvantages and with a significantly improved efficiency.
  • a soot converter in which a tube with a perforated outer surface is arranged between the housing and the spray electrode and is surrounded on its outer surface by filter material.
  • the invention is based on the one hand on the idea that the exhaust gases flowing out of the combustion chamber of a diesel engine contain ionized soot particles.
  • the knowledge is exploited that, due to the spray electrode, not only an electrostatic deposition, but also, in cooperation with the electrostatic field, ionization of the soot particles occurs, which accelerate radially into the filter material immediately adjacent to the exhaust gas flow guide.
  • the kinetic energy of the soot particles when they hit the filter material and the particles already or possibly still present there support automatic combustion, which starts after a short operating time of the internal combustion engine and then stops continuously.
  • the self-regeneration of the filter by burning off the soot particles is also by the Existing heat of the exhaust gas favors.
  • the removal of soot particles can be achieved with the converter according to the invention without loss of pressure, because the exhaust gases flow through the exhaust gas duct in the housing almost without resistance, ie without forced flow through a filter material.
  • the ozone produced in the high-voltage field also influences the chemical reaction of the ionized soot particles and thus promotes the combustion of the soot incorporated into non-toxic carbon dioxide without the high temperatures mentioned at the outset being necessary.
  • the automatic combustion of the soot particles in the filter material can advantageously be promoted by catalytically coated filter material, which lowers the combustion temperature.
  • Compressed, porous materials are suitable as filter material, such as steel wool, ceramics, minerals.
  • a fabric tube can be arranged in the converter housing to guide the exhaust gas flow. This should have an almost completely open lateral surface, so that the soot particles accelerated radially outwards over the entire circumferential area of the tube unimpeded into the immediately surrounding, i.e. filter material adjacent to the pipe surface can penetrate.
  • the voltage applied to the spray electrode is negative.
  • the negative voltage of the spray electrode which may consist of several wires, results in a corona that is considerably larger than the positive voltage.
  • the pulsating DC voltage can be provided by means of a transformer which is supplied with electrical current by the car battery. Since the required current is very low, approx. 4 to 5 mA, the electrical system only slightly loaded the vehicle; this enables the high voltage, which does not need to exceed approx. 10 kV, to be implemented safely and without problems.
  • the fabric tube can advantageously be formed with a radially outwardly projecting, web-like longitudinal seam.
  • a smooth inner jacket surface can be achieved in the interior of the tube by the outwardly directed longitudinal seam in the region of the abutting edges of the mat formed into a tube; Tensions and the skipping of sparks, as cannot be excluded in the case of overlapping abutting edges, do not occur.
  • the exhaust gases coming from an internal combustion engine are fed to a soot converter 101 in the direction of the arrow 102 via an inlet connection 103.
  • the soot converter 101 consists of a housing 104 which concentrically surrounds a fabric tube 105.
  • the tube 105 extends through the entire housing 104 and connects the inlet connector 103 to an opposite outlet connector 106.
  • the tube 105 is enveloped by filter material 107, which completely fills the space between the outer surface of the tube 105 and the housing 104.
  • An electrostatic field is generated for the automatic burning off of the soot particles introduced into the converter 101.
  • the converter 101 has a grounded housing 9, for example connected to ground, with connections 10, 11 for applying a pulsating direct voltage to a spray electrode in the form of a metal wire 12.
  • the metal wire 12 extends in the longitudinal direction through the fabric tube 105 and is on the output side of the inlet and outlet port 103 and 106 vertically arranged insulators 13 attached.
  • the spray electrode 12 is stretched between the insulators 13 fixed to the housing 9 by means of bases 14; Any elongation of the spray electrode 12 caused by the hot exhaust gas flow compensates for a spring 15 which, in the embodiment according to FIG. 2, acts on the insulator 13 which is arranged in the region of the inlet connection piece 103 and is not connected to the current.
  • the insulator 13 is pivotally mounted in a spherical seat of the base 14; when the spray electrode 12 is elongated the spring 15, which is supported on the inside of a cap 18 encapsulating the insulator 13, presses the insulator 13 in its seat into a position which compensates for the elongation. Due to the voltage applied to the spray electrode 12, an electrostatic field builds up and causes the soot particles introduced into the soot converter 101 with the exhaust gas stream 102 via the inlet connection 103 to migrate increasingly in the direction of the meshes 108 of the tube 105, through which meshes 108 pass and accumulate in the filter material 107 until the filter regenerates due to the burned-off soot particles; the stored soot burns to non-toxic carbon dioxide.
  • the self-regenerating soot converter 101 with electrostatically assisted deposition shown in FIG. 2 differs from the converter 101 according to FIG. 1 by the horizontal arrangement of the insulators 113 which clamp the spray electrode 12.
  • the insulators 113 are arranged in covers 16, which are located on each end face of the housing 9 are flanged by means of bolts 17.
  • the covers 16 are provided with the inlet and outlet nozzles 103, 106 and inlet and outlet pipes 19, 20 arranged eccentrically with respect to the nozzles 103, 106.
  • the fabric tube 105 is, as shown in FIG. 3 for the inlet connection 103, with its ends plugged onto the connection 103, 106.
  • the spring 15 is supported on the insulator 113 and presses against a plate 21 at the end of the spray electrode 12 passed through the insulator 113.
  • the fabric tube 105 shown in FIG. 4 has a radially outwardly projecting, web-like longitudinal seam 22 with laterally angled locking surfaces 23; with the longitudinal seam 22
  • the fabric tube 105 can be inserted into grooves in the inlet and outlet ports 103, 106 and secured in its position via the locking surfaces 23.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Electrostatic Separation (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Claims (8)

  1. Convertisseur de suie servant à éliminer les particules de suie des gaz d'échappement des moteurs à combustion interne, notamment d'un moteur diesel, comportant une amenée ou une évacuation des gaz d'échappement, disposée aux extrémités respectives d'un boîtier tubulaire (9) ainsi qu'une électrode de pulvérisation (12) qui est isolée électriquement par rapport au boîtier raccordé au potentiel de masse et s'étend à l'intérieur du boîtier (9), dans la direction longitudinale de ce dernier,
    caractérisé en ce que
    un tube (105) possédant une surface enveloppe perforée est disposé entre le boîtier (9) et l'électrode de pulvérisation (12) et est enveloppé, au niveau de sa surface extérieure, par un matériau filtrant (107).
  2. Convertisseur de suie selon la revendication 1, caractérisé en ce que le tube (105) est réalisé sous la forme d'un tube en tissu.
  3. Convertisseur de suie selon la revendication 2, caractérisé en ce que le tube formé d'un tissu (105) possède un raccord longitudinal (22) en forme de barrette, qui fait saillie vers l'extérieur.
  4. Convertisseur de suie selon l'une des revendications 1 à 3, caractérisé en ce que le matériau filtrant (107) est formé par dépôt catalytique.
  5. Convertisseur de suie selon l'une des revendications 1 à 4, caractérisé en ce que l'enveloppe en matériau filtrant (107) possède un diamètre égal au moins au triple de celui du filtre (105).
  6. Convertisseur de suie selon l'une des revendications 1 à 5, caractérisé en ce que l'électrode de pulvérisation (12) est formée par au moins un fil métallique tendu entre des isolateurs (13,113) disposés au niveau de l'entrée et de la sortie du tube.
  7. Convertisseur de suie selon l'une des revendications 1 à 6, caractérisé en ce qu'une tension continue pulsatoire est appliquée à l'électrode de pulvérisation (12)
  8. Convertisseur de suie selon la revendication 7, caractérisé en ce que la tension appliquée à l'électrode de pulvérisation est négative.
EP87110439A 1986-08-01 1987-07-18 Filtre d'élimination des particules de suie, en particulier dans le courant des gas d'échappement d'un moteur diesel Expired - Lifetime EP0256325B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87110439T ATE69087T1 (de) 1986-08-01 1987-07-18 Filter zum entfernen von russpartikeln, insbesondere aus dem abgasstrom eines dieselmotors.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3626020 1986-08-01
DE3626020 1986-08-01

Publications (3)

Publication Number Publication Date
EP0256325A2 EP0256325A2 (fr) 1988-02-24
EP0256325A3 EP0256325A3 (en) 1988-05-25
EP0256325B1 true EP0256325B1 (fr) 1991-10-30

Family

ID=6306457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87110439A Expired - Lifetime EP0256325B1 (fr) 1986-08-01 1987-07-18 Filtre d'élimination des particules de suie, en particulier dans le courant des gas d'échappement d'un moteur diesel

Country Status (4)

Country Link
EP (1) EP0256325B1 (fr)
AT (1) ATE69087T1 (fr)
DE (1) DE3774205D1 (fr)
NL (1) NL8800208A (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3723544A1 (de) * 1987-07-16 1989-01-26 Man Technologie Gmbh Elektrostatischer filter zum reinigen von gasen
DE3805395A1 (de) * 1988-02-20 1989-08-31 Man Technologie Gmbh Elektrostatischer dieselpartikelfilter
DE3844141C1 (fr) * 1988-12-28 1990-06-07 Voest-Alpine Automotive Ges.M.B.H., Linz, At
US4956152A (en) * 1989-05-10 1990-09-11 Electro Statics, Inc. Emission control unit
DE3923640A1 (de) * 1989-06-15 1990-12-20 Asea Brown Boveri Verfahren zur ausfilterung von russpartikeln
JPH0552212U (ja) * 1991-12-25 1993-07-13 株式会社丸山製作所 排気消音器
AT397928B (de) * 1993-03-22 1994-08-25 Panning Peter Vorrichtung zum abbau von in einem gasstrom enthaltenen schadstoffen
IT1275073B (it) * 1994-11-07 1997-07-30 Efisio Serra Dispositivo per marmitte di scarico di motori endotermici a campo elettrostatico
FR2798303B1 (fr) * 1999-09-14 2001-11-09 Daniel Teboul Dispositif de traitement d'un milieu gazeux, en particulier des gaz d'echappement d'un moteur a combustion interne, et vehicule equipe d'un tel dispositif
FR2822893B1 (fr) * 2001-03-29 2003-07-18 Renault Systeme de traitement des gaz d'echappement

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3440689A1 (de) * 1984-11-07 1986-05-15 Siemens AG, 1000 Berlin und 8000 München Verfahren zum vermindern von schadstoffen in auspuffgasen von kraftfahrzeugen

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Publication number Priority date Publication date Assignee Title
FR701007A (fr) * 1930-08-23 1931-03-10 Procédé et dispositif pour supprimer les fumées et pour réduire la quantité d'oxyde de carbone contenu dans les gaz d'échappement des moteurs à explosion
DE2041886A1 (de) * 1969-09-03 1972-03-02 Glaser Willy Dr Ing Filterung von Kraftfahrzeug-Auspuffgas
US3683624A (en) * 1970-09-29 1972-08-15 Theodore M Williams Internal combustion engine exhaust burner
US4211302A (en) * 1976-02-03 1980-07-08 Recourt Martyn Elizabeth De Sound absorbing device
JPS5720510A (en) * 1980-07-15 1982-02-03 Nagatoshi Suzuki Exhaust gas cleaner of engine
JPS5788213A (en) * 1980-11-21 1982-06-02 Nippon Soken Inc Carbon particle purifying device
JPS58132295A (ja) * 1982-01-29 1983-08-06 三菱電機株式会社 吸音材の製造方法
DE3205185C2 (de) * 1982-02-13 1985-12-12 Wilfried 6238 Hofheim Seitz Verfahren zum Herstellen einer Schalldämpf-Füllung für einen Auspufftopf sowie nach diesem Verfahren hergestellte Schalldämpf-Füllung
JPS6176714A (ja) * 1984-09-20 1986-04-19 Mitsubishi Electric Corp 内燃機関用排気消音装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3440689A1 (de) * 1984-11-07 1986-05-15 Siemens AG, 1000 Berlin und 8000 München Verfahren zum vermindern von schadstoffen in auspuffgasen von kraftfahrzeugen

Also Published As

Publication number Publication date
EP0256325A3 (en) 1988-05-25
EP0256325A2 (fr) 1988-02-24
ATE69087T1 (de) 1991-11-15
DE3774205D1 (de) 1991-12-05
NL8800208A (nl) 1989-08-16

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