EP0355489B1 - Conduit de gaz d'échappement d'un moteur à combustion interne à branches multiples - Google Patents

Conduit de gaz d'échappement d'un moteur à combustion interne à branches multiples Download PDF

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Publication number
EP0355489B1
EP0355489B1 EP89114153A EP89114153A EP0355489B1 EP 0355489 B1 EP0355489 B1 EP 0355489B1 EP 89114153 A EP89114153 A EP 89114153A EP 89114153 A EP89114153 A EP 89114153A EP 0355489 B1 EP0355489 B1 EP 0355489B1
Authority
EP
European Patent Office
Prior art keywords
guide element
exhaust pipe
exhaust gas
branch
combustion engine
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
EP89114153A
Other languages
German (de)
English (en)
Other versions
EP0355489A1 (fr
Inventor
Reinhold Alt
Erhard Otto
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke 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
Priority claimed from DE8810816U external-priority patent/DE8810816U1/de
Application filed by Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Publication of EP0355489A1 publication Critical patent/EP0355489A1/fr
Application granted granted Critical
Publication of EP0355489B1 publication Critical patent/EP0355489B1/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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2053—By-passing catalytic reactors, e.g. to prevent overheating
    • 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
    • F01N13/009—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 purifying devices arranged 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F01N2410/02—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device in case of high temperature, e.g. overheating of catalytic reactor

Definitions

  • the invention relates to a branched exhaust pipe of an internal combustion engine according to the preamble of claim 1.
  • Exhaust systems of motor vehicles provided with exhaust gas catalysts have become known, in which there is a relatively small-sized start catalytic converter connected to the exhaust line via a first branch, while a second branch leads directly to a continuous operation designed for a high mass throughput. Catalyst leads. Furthermore, a pivotable flap is arranged in the branching in the known prior art, which, depending on its position, directs the exhaust gas flow into the first or second branch of the exhaust pipe. This arrangement is provided in order to achieve a successful conversion of harmful exhaust gas components as soon as possible after starting the internal combustion engine.
  • branched exhaust pipes for example, known from DE-A-2420678 have proven themselves, but problems can arise in the technical design.
  • seizing of the flap in one of the two flap positions cannot be avoided despite the most complex storage and guidance due to the sometimes aggressive exhaust gas components.
  • the control mechanism for such a flap is extremely complex.
  • DE-OS 22 50 898 describes such a rotary flap, which not only opens automatically due to the higher flow pressure with a higher gas throughput, but also releases the second bypass line branch at a higher temperature under the influence of a bimetal spring.
  • the mechanical flap problems also occur here.
  • the object of the invention is therefore to demonstrate an exhaust pipe which is significantly reduced in terms of expenditure and of the type specified in the preamble of the first claim. This object is achieved by the characterizing features of the first claim, advantageous embodiments and further developments describe the subclaims.
  • the guide element is made of a material that deforms under the influence of temperature. By suitable shaping of the guide element it is thus possible to achieve the desired division or guidance in accordance with the shape dependent on the respective exhaust gas temperature.
  • expansion elements known per se can also be used.
  • the guide element can be designed as a bimetal element, which also has a different shape depending on the material temperature and thus also the temperature of the exhaust gas stream. In the sense of an advantageous combination of functions, both the determination of the exhaust gas temperature and the corresponding reaction, namely the desired division or guidance of the exhaust gas flow, always take place in the guide element itself. All this prevents, due to the directly acting adjusting forces triggered by the high temperature differences also seizing of the guide element.
  • FIG. 1 and 2 show preferred embodiments of the invention.
  • Fig. 3 shows the section A-A of Fig. 1st
  • the exhaust gas is discharged into the environment via an exhaust pipe designated in its entirety by 2 and via a continuous operation catalytic converter 3. Since the latter requires a certain minimum temperature for the successful conversion of harmful exhaust gas components, however, due to its large mass, this only takes a certain time after the start of the When the internal combustion engine is reached, a so-called start catalytic converter 4 with a smaller overall volume is additionally provided near the internal combustion engine. However, since the latter is not able to absorb the entire exhaust gas flow in the already heated state - this would destroy the starting catalytic converter due to high temperature peaks - this starting catalytic converter 4 is arranged in a second line branch 5 of the exhaust line 2, which is below Influence of a guide element 10 can be blocked. In these cases, the exhaust gas flows bypassing the start catalyst 4 via a first bypass line branch 6 directly to the continuous operation catalyst 3.
  • the guide element 10 which carries out the desired division or control of the exhaust gas flow, is generally made of a material deforming under the influence of temperature.
  • this guide element 10 is designed as a bimetal tongue.
  • this bimetallic tongue is connected with its end 11a to a web 12 of the exhaust pipe 2 expanded in the area of the starting catalytic converter.
  • this bimetal tongue is shown in two different positions. In the position shown with solid lines, the guide element 10 closes the bypass line branch 6 and guides the entire exhaust gas flow via the start catalytic converter 4. In the dash-dotted representation, however, the guide element blocks the second line branch 5, so that the entire exhaust gas flow is via the Bypass line branch 6 reaches catalytic converter 3 for continuous operation. In addition to these two extreme positions, the guide element 10 can of course also assume any intermediate position and, in particular, the exhaust gas flow, as desired divide with its free end 11b quantitatively between the two line branches 5, 6. Due to its bimetallic structure, the guide element 10 essentially assumes the desired position depending on the temperature of the exhaust gas flow.
  • the guide element 10 advantageously represents the wall separating the bypass line branch 6 from the second line branch 5 two extreme positions are provided. This measure considerably reduces the flow resistance within the exhaust pipe 2.
  • FIG. 2 Another exemplary embodiment is shown in FIG. 2.
  • the two line branches 5, 6 are implemented in separate pipelines.
  • two guide elements 10a, 10b are provided, which in turn are shown in the two possible extreme positions.
  • FIG. 3 shows a preferred measure for improved partitioning of the line branches 5 and 6 to be blocked off by the guide element 10.
  • the exhaust gas line has a cross-section widened within the adjustment range 13 of the guide element 10, which is hatched and shown in broken lines in FIG. 3 on.
  • the guide element 10 bears against the right step 14, as shown, analogous to a labyrinth of seals, there is an improved sealing of the line branch 6 then shut off.
  • This design also advantageously results in improved guidance of the guide element 10.

Claims (5)

1. Tubulure d'échappement (2) à plusieurs branches pour un moteur à combustion interne (1), avec un élément de guidage (10) pour répartir le flux des gaz d'échappement en fonction de la température, entre une branche de tubulure (5) avec un catalyseur (4) et une branche de tubulure de contournement (6), caractérisée en ce que l'élément de guidage (10) est réalisé en un matériau se déformant sous l'influence de la température et assure en permanence la répartition désirée du flux de gaz d'échappement en fonction de la forme respective.
2. Tubulure d'échappement à plusieurs branches avec un élément de guidage (10) commandé, en un matériau bimétallique selon la revendication 1, caractérisée en ce que l'élément de guidage (10) est constitué par l'élément en un matériau bimétallique.
3. Tubulure d'échappement selon la revendication 1 ou 2, caractérisée en ce que l'élément de guidage en forme de languette est fixé solidaire par une extrémité (11a) et son extrémité libre (11b) dirige et/ou répartit essentiellement le flux des gaz d'échappement.
4. Tubulure d'échappement selon l'une des revendications précédentes, caractérisée en ce que, dans le secteur de la dérivation (7) de tubulures, plusieurs éléments de guidage (10a, 10b) sont prévus.
5. Tubulure d'échappement selon l'une des revendications ci-dessus, caractérisée par une section transversale élargie en forme de gradins dans la zone de réglage (13) de l'élément de guidage (10).
EP89114153A 1988-08-26 1989-08-01 Conduit de gaz d'échappement d'un moteur à combustion interne à branches multiples Expired - Lifetime EP0355489B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE8810816U DE8810816U1 (fr) 1988-08-26 1988-08-26
DE8810816U 1988-08-26
DE3832509 1988-09-24
DE3832509 1988-09-24

Publications (2)

Publication Number Publication Date
EP0355489A1 EP0355489A1 (fr) 1990-02-28
EP0355489B1 true EP0355489B1 (fr) 1992-03-04

Family

ID=25872558

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114153A Expired - Lifetime EP0355489B1 (fr) 1988-08-26 1989-08-01 Conduit de gaz d'échappement d'un moteur à combustion interne à branches multiples

Country Status (2)

Country Link
EP (1) EP0355489B1 (fr)
DE (1) DE58900911D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343468B4 (de) * 2003-09-19 2010-07-08 Audi Ag Abgaskühler für eine Abgasanlage einer Brennkraftmaschine eines Fahrzeuges, insbesondere eines Kraftfahrzeuges

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8815794U1 (fr) * 1988-12-20 1990-04-26 Emitec Emissionstechnologie
US5229080A (en) * 1990-06-29 1993-07-20 Ngk Insulators, Ltd. Resistance adjusting type heater and catalytic converter
US5229079A (en) * 1990-06-29 1993-07-20 Ngk Insulators, Ltd. Catalytic converter for use in automotive exhaust emission control
CA2045726C (fr) * 1990-06-29 1997-09-09 Takashi Harada Resistance chauffante reglable, convertisseur catalytique et methode de reduction des gaz d'echappement des vehicules automobiles
JP2843426B2 (ja) * 1990-07-04 1999-01-06 日本碍子株式会社 触媒コンバーターの操作方法
JP2898364B2 (ja) * 1990-07-06 1999-05-31 日本碍子株式会社 電極一体型ハニカムヒーター及びその製造方法
US5234668A (en) * 1990-07-25 1993-08-10 Ngk Insulators, Ltd. Catalytic converter for use in automotive exhaust emissions control
JP2848970B2 (ja) * 1990-12-21 1999-01-20 日本碍子株式会社 ハニカムヒーター及び触媒コンバーター
JP3200772B2 (ja) * 1992-03-30 2001-08-20 ヤマハ発動機株式会社 内燃機関用触媒付きマフラー
DE4218834C2 (de) * 1992-06-09 1996-11-28 Opel Adam Ag Abgasanlage für einen Verbrennungsmotor
DE4311574A1 (de) * 1993-04-08 1995-02-16 Duerrwaechter E Dr Doduco Temperaturgesteuertes Abgasabsperrventil für Verbrennungsmotoren in Kraftfahrzeugen
DE19742762C1 (de) 1997-09-27 1998-12-10 Ford Global Tech Inc Abgasanlage für einen Verbrennungsmotor
ITBO20000535A1 (it) * 2000-09-15 2002-03-15 Ferrari Spa Dispositivo di scarico per motori a conbustione interna

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1451881A1 (de) * 1963-09-07 1969-01-23 Daimler Benz Ag Vorrichtung zum katalytischen Nachverbrennen von Abgasen einer Brennkraftmaschine,insbesondere in Kraftfahrzeugen
US3963447A (en) * 1971-07-20 1976-06-15 Nissan Motor Co., Ltd. Catalytic reactor for exhaust gases
AT316934B (de) * 1972-02-10 1974-08-12 Johann Endholzer Einrichtung zur Führung der Abgase von Brennkraftmaschinen
JPS5232006B2 (fr) * 1972-05-09 1977-08-18
DE2420678A1 (de) * 1974-04-29 1975-11-06 Daimler Benz Ag Verbrennungskraftmaschine mit einem katalysator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10343468B4 (de) * 2003-09-19 2010-07-08 Audi Ag Abgaskühler für eine Abgasanlage einer Brennkraftmaschine eines Fahrzeuges, insbesondere eines Kraftfahrzeuges

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Publication number Publication date
EP0355489A1 (fr) 1990-02-28
DE58900911D1 (de) 1992-04-09

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