WO1995016111A1 - Exhaust system for a diesel engine - Google Patents

Exhaust system for a diesel engine Download PDF

Info

Publication number
WO1995016111A1
WO1995016111A1 PCT/EP1994/004014 EP9404014W WO9516111A1 WO 1995016111 A1 WO1995016111 A1 WO 1995016111A1 EP 9404014 W EP9404014 W EP 9404014W WO 9516111 A1 WO9516111 A1 WO 9516111A1
Authority
WO
WIPO (PCT)
Prior art keywords
pipes
exhaust system
inner walls
diesel engine
soot
Prior art date
Application number
PCT/EP1994/004014
Other languages
German (de)
French (fr)
Inventor
Richard Bauder
Original Assignee
Audi Ag
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 Audi Ag filed Critical Audi Ag
Priority to EP95903314A priority Critical patent/EP0733157B1/en
Priority to DE59406293T priority patent/DE59406293D1/en
Publication of WO1995016111A1 publication Critical patent/WO1995016111A1/en

Links

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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/16—Selection of particular materials
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/02—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate silencers in series
    • 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
    • F01N2230/00—Combination of silencers and other devices
    • F01N2230/04—Catalytic converters
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/08—Surface coverings for corrosion prevention
    • 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 an exhaust system for a diesel internal combustion engine according to the preamble of claim 1.
  • the object of the invention is to provide an exhaust system of the generic type, in which the particle accumulation in part-load operation is reduced considerably with little effort and, consequently, the soot surge during the subsequent acceleration is considerably reduced.
  • At least the inner walls of the connecting pipes and the pipes in the reflection silencer have a maximum roughness of 1 ⁇ m. It has been shown that with such pipes, the inner surface of which has a roughness depth which is only about 20% of the roughness depth of conventional exhaust pipes, the particle accumulation is considerably reduced, namely by up to 60%, which is has a corresponding reduction in the soot impact.
  • the low roughness depth is preferably achieved by coating the inner walls of the pipes, for example by B. by coating with aluminum, or by enamelling, can be realized with the roughness depth of 0.5 ⁇ m.
  • the enamelling of the inner surfaces of the tubes has the further advantage that the inner surfaces of the tubes are then electrically non-conductive, so that no electrostatic charge can occur which could favor the adherence of particles.
  • an exhaust system of a diesel internal combustion engine 1 is schematically shown, on the outlet manifold 2 of which a front pipe 3 is flanged, which is connected to an oxidation catalytic converter 4, to which a reflection pre-silencer 6 is connected by a first intermediate pipe 5, which is in turn connected to a main reflection silencer 8 by a second connecting pipe 7.
  • a front pipe 3 is flanged, which is connected to an oxidation catalytic converter 4
  • a reflection pre-silencer 6 is connected by a first intermediate pipe 5, which is in turn connected to a main reflection silencer 8 by a second connecting pipe 7.
  • the inner walls of the tubes 3, 5, 7 and 9 and the tubes 10, 11, 12 in the mufflers 6 and 8 have a maximum roughness of 1 ⁇ m, which is achieved in particular by an aluminum coating or enamelling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Processes For Solid Components From Exhaust (AREA)

Abstract

In an exhaust system for a diesel engine with a catalyst (4) and at least one baffle silencer (6, 8) which are connected together and to the engine (1) by pipes (3, 5, 7), the inner walls of the connecting pipes and pipes (10, 11, 12) in the baffle silencer are given a roughness of 1 νm at the most, for example by coating the inner walls with aluminium or enamelling them. This considerably reduces the accumulation of particles on partial load and soot deposition during subsequent acceleration.

Description

Auspuffanläge für eine Diesel-BrennkraftmaschineExhaust systems for a diesel internal combustion engine
Beschreibungdescription
Die Erfindung betrifft eine Auspuffanläge für eine Diesel-Brennkraftmaschine entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to an exhaust system for a diesel internal combustion engine according to the preamble of claim 1.
Bei allen Diesel-Brennkraftmaschinen lagert sich nach längerer Teillastfahrt, also vor allem im Stadtbetrieb, in der gesamten Auspuffanläge Ruß an, der dann bei star¬ ker Beschleunigung, also bei hoher Drehzahl und Last, ausgeblasen wird und den bekannten Rußstoß erzeugt, der eine erhöhte momentane Umweltbelastung zur Folge hat.All diesel internal combustion engines accumulate soot in the entire exhaust system after a long partial load run, that is, especially in city operations, which soot is then blown out under strong acceleration, that is to say at high speed and load, and produces the known soot surge, which increases the rate of soot current environmental impact.
Es wurden bereits verschiedene Maßnahmen zur Verringerung der innermotorischen Rußbildung und damit auch zur Ver¬ ringerung des Rußstoßes vorgeschlagen (siehe VDI Berichte Nr. 910 1991), die unter anderem eine Druckluftzugabe in den Auslaßkanal oder eine Wassereinspritzung in die Aus¬ puffanlage vorsehen. Diese Maßnahmen sind jedoch äußerst aufwendig.Various measures for reducing the soot formation within the engine and thus also for reducing the soot impact have already been proposed (see VDI reports No. 910 1991), which include, among other things, adding compressed air to the exhaust duct or water injection into the exhaust system. However, these measures are extremely complex.
Aufgabe der Erfindung ist es, eine Auspuffanläge der gat¬ tungsgemäßen Art zu schaffen, bei der mit geringem Auf¬ wand die Partikellakkumulation im Teillastbetrieb erheb¬ lich reduziert und demzufolge der Rußstoß bei der folgen¬ den Beschleunigung beträchtlich verringert wird.The object of the invention is to provide an exhaust system of the generic type, in which the particle accumulation in part-load operation is reduced considerably with little effort and, consequently, the soot surge during the subsequent acceleration is considerably reduced.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zumindest die Innenwände der Verbindungsrohre und der Rohre im Reflexionsschalldämpfer eine Rauhtiefe von maxi¬ mal 1 μm aufweisen. Es hat sich gezeigt, daß mit derartigen Rohren, deren In¬ nenfläche eine Rauhtiefe aufweist, die nur etwa 20% der Rauhtiefe von üblichen Auspuffrohren beträgt, die Parti¬ kelakkumulation erheblich, und zwar um bis zu 60%, ver¬ ringert wird, was eine entsprechende Reduzierung des Ru߬ stoßes zur Folge hat.This object is achieved in that at least the inner walls of the connecting pipes and the pipes in the reflection silencer have a maximum roughness of 1 μm. It has been shown that with such pipes, the inner surface of which has a roughness depth which is only about 20% of the roughness depth of conventional exhaust pipes, the particle accumulation is considerably reduced, namely by up to 60%, which is has a corresponding reduction in the soot impact.
Die geringe Rauhtiefe wird vorzugsweise durch eine Be¬ schichtung der Innenwände der Rohre erreicht, und zwar z. B. durch eine Beεchichtung mit Aluminium, oder durch eine Emaillierung, mit der Rauhtiefen von 0,5 μm verwirk¬ licht werden können. Die Emaillierung der Innenflächen der Rohre hat den weiteren Vorteil, daß die Innenflächen der Rohre dann elektrisch nicht leitend sind, so daß sich keine elektrostatische Aufladung einstellen kann, die ein Anhaften von Partikeln begünstigen könnte.The low roughness depth is preferably achieved by coating the inner walls of the pipes, for example by B. by coating with aluminum, or by enamelling, can be realized with the roughness depth of 0.5 μm. The enamelling of the inner surfaces of the tubes has the further advantage that the inner surfaces of the tubes are then electrically non-conductive, so that no electrostatic charge can occur which could favor the adherence of particles.
In der Zeichnung ist εchematisch eine Auspuffanläge einer Diesel-Brennkraftmaschine 1 dargestellt, an deren Ausla߬ krümmer 2 ein Vorrohr 3 angeflanscht ist, das mit einem Oxidationskatalysator 4 verbunden ist, an den durch ein erstes Zwischenrohr 5 ein Reflexions-Vorschalldämpfer 6 angeschlossen ist, der wiederum durch ein zweites Verbin¬ dungsrohr 7 mit einem Reflexions-Hauptschalldämpfer 8 verbunden ist. An diesen schließt sich ein Endrohr 9 an.In the drawing, an exhaust system of a diesel internal combustion engine 1 is schematically shown, on the outlet manifold 2 of which a front pipe 3 is flanged, which is connected to an oxidation catalytic converter 4, to which a reflection pre-silencer 6 is connected by a first intermediate pipe 5, which is in turn connected to a main reflection silencer 8 by a second connecting pipe 7. This is followed by an end pipe 9.
Erfindungsgemäß haben die Innenwände der Rohre 3, 5, 7 und 9 sowie die Rohre 10, 11, 12 in den Schalldämpfern 6 und 8 einem Rauhtiefe von maximal 1 μm was insbesondere durch eine Aluminiumbeschichtung oder eine Emaillierung erreicht wird.According to the invention, the inner walls of the tubes 3, 5, 7 and 9 and the tubes 10, 11, 12 in the mufflers 6 and 8 have a maximum roughness of 1 μm, which is achieved in particular by an aluminum coating or enamelling.
Derartige Rohre können mit nur geringen Mehrkosten herge¬ stellt werden. Pipes of this type can be produced with only slight additional costs.

Claims

Schutzansprüche Protection claims
1. Auspuffanläge für eine Diesel-Brennkraftmaschine (1), mit einem Katalysator (4) und mindestens einem Re¬ flexionsschalldämpfer (6, 8) die miteinander und mit der Brennkraftmaschine durch Rohre (3, 5, 7) verbunden sind,1. Exhaust systems for a diesel internal combustion engine (1), with a catalytic converter (4) and at least one reflection silencer (6, 8) which are connected to one another and to the internal combustion engine by pipes (3, 5, 7),
d a d u r c h g e k e n n z e i c h n e t ,characterized ,
daß zumindest die Innenwände der Verbindungsrohre (3, 5, 7) und die Rohre (10, 11, 12) im Reflexionsschall¬ dämpfer (6, 8) eine Rauhtiefe von maximal 1 μ auf¬ weisen.that at least the inner walls of the connecting pipes (3, 5, 7) and the pipes (10, 11, 12) in the reflection silencer (6, 8) have a maximum roughness depth of 1 μ.
2. Auspuffanläge nach Anspruch 1, dadurch gekennzeichnet, daß die Innenwände der Rohre mit einer Aluminium-Be- εchichtung versehen sind.2. Exhaust system according to claim 1, characterized in that the inner walls of the pipes are provided with an aluminum coating.
3. Auspuffanläge nach Anspruch 1, dadurch gekennzeichnet, daß die Innenwände der Rohre emailliert sind. 3. Exhaust system according to claim 1, characterized in that the inner walls of the pipes are enamelled.
PCT/EP1994/004014 1993-12-09 1994-12-02 Exhaust system for a diesel engine WO1995016111A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP95903314A EP0733157B1 (en) 1993-12-09 1994-12-02 Exhaust system for a diesel engine
DE59406293T DE59406293D1 (en) 1993-12-09 1994-12-02 EXHAUST SYSTEM FOR A DIESEL INTERNAL COMBUSTION ENGINE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9318921U DE9318921U1 (en) 1993-12-09 1993-12-09 Exhaust system for a diesel internal combustion engine
DEG9318921.4U 1993-12-09

Publications (1)

Publication Number Publication Date
WO1995016111A1 true WO1995016111A1 (en) 1995-06-15

Family

ID=6901775

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/004014 WO1995016111A1 (en) 1993-12-09 1994-12-02 Exhaust system for a diesel engine

Country Status (3)

Country Link
EP (1) EP0733157B1 (en)
DE (2) DE9318921U1 (en)
WO (1) WO1995016111A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001049A1 (en) * 2000-06-30 2002-01-03 Faurecia Systemes D'echappement Exhaust volume and exhaust device comprising same

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2742802B1 (en) * 1995-12-20 1998-01-30 Lorraine Laminage MOTOR VEHICLE EXHAUST
JP2001330394A (en) * 2000-05-22 2001-11-30 Denso Corp Exhaust gas heat exchanger
DE202007012019U1 (en) 2007-08-28 2008-02-21 Penzkofer, Klaus Exhaust system for motor vehicles with internal combustion engines

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007131A1 (en) * 1978-07-07 1980-01-23 Reimbold & Strick GmbH & Co. KG Enamelled sound absorber and method for its enamelling

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Publication number Priority date Publication date Assignee Title
AT355878B (en) * 1975-05-30 1980-03-25 Vmw Ranshofen Berndorf Ag EXHAUST SYSTEM
DE2917586C2 (en) * 1979-04-30 1982-11-18 Werner Dr.-Ing. 8450 Amberg Baumann Enamelled sheet steel muffler
DE3015907A1 (en) * 1980-04-24 1981-10-29 Werner Dr.-Ing. 8450 Amberg Baumann Built-up exhaust-line chamber of enamelled sheet steel - has sheet steel inserts, perforated with downstream hole-edge projections variously shaped
DE3638807A1 (en) * 1986-11-17 1988-05-19 Westfalia Email Cast iron exhaust manifold for cylinder internal combustion engines

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0007131A1 (en) * 1978-07-07 1980-01-23 Reimbold & Strick GmbH & Co. KG Enamelled sound absorber and method for its enamelling

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ASHWORTH ET AL: "Materials requirements for modern exhaust systems", STEEL TIMES INTERNATIONAL, no. 4, 17 July 1993 (1993-07-17), REDHILL, SURREY, GB, pages 36 - 38, XP000389933 *
J. DECROIX ET AL.: "Evolution des matériaux pour la ligne d' échappement de l' automobile européene", INGENIEURS DE L' AUTOMOBILE, no. 4, May 1986 (1986-05-01), PARIS, FRANCE, pages 94 - 98 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002001049A1 (en) * 2000-06-30 2002-01-03 Faurecia Systemes D'echappement Exhaust volume and exhaust device comprising same
FR2811015A1 (en) * 2000-06-30 2002-01-04 Ecia Equip Composants Ind Auto EXHAUST VOLUME AND EXHAUST DEVICE COMPRISING SAME

Also Published As

Publication number Publication date
DE59406293D1 (en) 1998-07-23
EP0733157B1 (en) 1998-06-17
DE9318921U1 (en) 1994-02-03
EP0733157A1 (en) 1996-09-25

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