EP0313922B1 - Procédé pour influer sur la température des gaz d'échappement et dispositif d'échappement pour réaliser ce procédé - Google Patents

Procédé pour influer sur la température des gaz d'échappement et dispositif d'échappement pour réaliser ce procédé Download PDF

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Publication number
EP0313922B1
EP0313922B1 EP88116975A EP88116975A EP0313922B1 EP 0313922 B1 EP0313922 B1 EP 0313922B1 EP 88116975 A EP88116975 A EP 88116975A EP 88116975 A EP88116975 A EP 88116975A EP 0313922 B1 EP0313922 B1 EP 0313922B1
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EP
European Patent Office
Prior art keywords
exhaust
exhaust gas
gas
catalyst
gas system
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
EP88116975A
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German (de)
English (en)
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EP0313922A1 (fr
Inventor
Wolfgang Semet
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
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Bayerische Motoren Werke AG
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Publication of EP0313922A1 publication Critical patent/EP0313922A1/fr
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    • 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

Definitions

  • the invention relates to a method for influencing the temperature of exhaust gases in the inlet area of an exhaust gas catalytic converter provided in an exhaust gas system, a quantity-controlled internal combustion engine, and to an exhaust gas system for carrying out this method.
  • Exhaust gas catalysts or the exhaust gases of an internal combustion engine to be cleaned therein require a certain operating temperature for the successful conversion of harmful exhaust gas components, which should not fall below a lower threshold value and should always be below an upper limit value. If the upper limit value is exceeded, the degree of conversion of an exhaust gas catalytic converter deteriorates due to thermal aging; if extremely high temperature peaks occur, even melting of the monolith arranged in the exhaust gas catalytic converter can occur. On the other hand, it is necessary to bring the exhaust gas catalytic converter to the minimum operating temperature required for a successful conversion within the shortest possible time.
  • a method for generating an optimal exhaust gas inlet temperature for the exhaust gas catalytic converter of internal combustion engines has become known from the generic DE-OS 3 406 968.
  • the engine exhaust is divided into two partial flows, one of which is cooled and the other is not cooled; the partial streams are reunited upstream of the catalyst and the catalyst temperature is regulated by changing the quantitative ratio of the two partial streams.
  • the object of the present invention is to demonstrate a method according to the preamble of the first claim, which requires a construction work that is significantly reduced compared to the known method. This object is achieved by the characterizing features of the first claim.
  • an exhaust gas partial flow removed from the exhaust gas system downstream of the exhaust gas catalytic converter is introduced into the exhaust gas system upstream of the exhaust gas catalytic converter, effective cooling of the exhaust gas in the inlet area of the exhaust gas catalytic converter can be achieved with this partial flow.
  • the return line required for the partial flow can be made extremely simple: only a small space requirement is required since only one partial flow is carried.
  • complex cooling measures can be dispensed with, since the cooling effect achieved over the return path is sufficient for the desired temperature reduction after the partial flow has been introduced into the exhaust system.
  • a partial exhaust gas stream taken downstream of the soot filter is also used for exhaust gas cooling.
  • a heat exchanger is provided for this.
  • the cooling exhaust gas flow is fed to the intake tract of the internal combustion engine.
  • the exhaust gas partial flow downstream of the exhaust gas catalytic converter does not contain any free oxygen, after the partial flow has been introduced into the exhaust gas system, any unburned hydrocarbons which may be present in the exhaust gas stream cannot damage the catalyst. If there is an oxygen probe in the exhaust system, with the aid of which the internal combustion engine is operated with a stoichiometric mixture for optimal conversion of the exhaust gas in the exhaust gas catalytic converter, the measurement result thereof is also not influenced by the exhaust gas partial flow returned for cooling purposes, since this partial flow, if it is downstream of the Exhaust gas catalyst is removed, can not contain free oxygen.
  • the partial stream can thus be added to the exhaust gas upstream of the oxygen probe, so that the probe is also subjected to lower exhaust gas temperatures.
  • the method according to the invention is also advantageous with regard to the conversion of harmful exhaust gas constituents: because the exhaust gas catalytic converter flows through at least one partial exhaust gas stream twice, a tendency to reduce the exhaust gas emissions that can still be measured after the catalytic converter can be determined.
  • the partial flow amount required for the required exhaust gas cooling can be determined and made available, for example depending on the exhaust gas temperature determined by means of a temperature sensor upstream of the exhaust gas catalytic converter.
  • an exhaust system for carrying out the method according to the invention are described in claims 3 to 7. Accordingly, a simple return line without complex additional measures can be provided for the partial exhaust gas flow if a check valve is provided in this return line.
  • the check valve prevents the exhaust gases from leaving the exhaust system upstream of the exhaust gas catalytic converter.
  • the path for the partial flow taken downstream of the exhaust gas catalytic converter is released in the case of negative pressure, and the partial flow is thus automatically conveyed upstream of the exhaust gas catalytic converter into the exhaust system.
  • a throttle element which controls the quantity of the partial exhaust gas flow can be added for example in the form of a clocking solenoid valve.
  • the element provided in the return line can be designed as a conveying device for the recirculated exhaust gas partial flow.
  • Conveying devices of this type for example pumps or small flow compressors, convey the desired partial exhaust gas stream upstream of the exhaust gas catalytic converter back into the exhaust system at operating points of the internal combustion engine in which the exhaust gas pressure downstream of the exhaust gas catalytic converter is not sufficient.
  • the conveying device can take over the function of the check valve and of the throttle element.
  • An exhaust gas system designated in its entirety by 2 is flanged to an internal combustion engine 1. This consists of two elbows 3a, 3b, an adjoining exhaust pipe 4, in which an oxygen sensor 5 is arranged, and which opens into the exhaust gas analyzer 6. This is followed by a rear silencer 7 via a pipe connection.
  • two return lines 8a, 8b branch off from the exhaust system 2 between the catalytic converter 6 and the rear muffler 7 and open into the manifolds 3a, 3b.
  • a check valve 9 and a solenoid valve 10 are arranged in the return line 8a.
  • the check valve 9 prevents exhaust gas from passing through the return line 8 against the arrow direction 11 directly from the manifold 3a to the rear silencer 7.
  • Another embodiment is implemented in the exhaust line 8b, which contains a conveyor device 12 for the exhaust gas partial flow to be recycled.
  • the conveying device 12 controllably conveys a partial exhaust gas flow in the direction of the arrow 11 to the manifold 3b.
  • Those partial flows cool down in particular in the return lines 8 to such an extent that the exhaust gas flow emitted by the internal combustion engine 1 is reduced to a level compatible with the catalytic converter 6 by admixing these partial flows with its temperature.
  • the solenoid valve 10 or the conveyor device 12 By appropriate activation of the solenoid valve 10 or the conveyor device 12, the partial flows guided via the return lines 8 can be controlled in such a quantity that the temperature level reaches a desired value after being brought together in the elbows 3 or in the exhaust pipe 4.
  • This temperature level can be determined, for example, by a temperature sensor, not shown, which engages the solenoid valve 10 or the conveying device 12 via a control unit, also not shown.
  • the exemplary embodiment shown merely represents a possible exhaust system for carrying out the method according to the invention for influencing the temperature of exhaust gases; Modifications from this are easily conceivable.

Claims (7)

1. Procédé pour influer sur la température des gaz d'échappement dans la zone d'entrée d'une installation d'échappement (2) d'un moteur à combustion interne (1) commandé quantitativement, avec un catalyseur (6) pour les gaz d'échappement, procédé caractérisé en ce qu'on réintroduit dans l'installation (2), en amont du catalyseur de gaz d'échappement (6), un flux partiel de gaz d'échappement pris dans l'installation (2) en aval du catalyseur de gaz d'échappement (6).
2. Procédé selon la revendication 1, caractérisé en ce qu'on commande quantitativement le flux partiel de gaz d'échappement.
3. Installation d'échappement d'un moteur à combustion interne à commande quantitative avec un catalyseur pour les gaz d'échappement, pour la mise en oeuvre du procédé selon la revendication 1 ou 2, caractérisée en ce qu'en aval du catalyseur de gaz d'échappement (6), l'installation (2) comporte en dérivation une tubulure de retour (8) pour un flux partiel de gaz d'échappement débouchant dans l'installation (2) en amont du catalyseur (6), tubulure qui comporte un organe de régulation.
4. Installation selon la revendication 3, caractérisée en ce que l'organe de régulation est un clapet anti-retour (9).
5. Installation selon la revendication 3 ou 4, caractérisée en ce que l'organe de régulation est un organe d'étranglement (électrovanne 10) qui règle le débit en fonction de la température des gaz d'échappement dans la zone d'entrée du catalyseur (6) recevant les gaz d'échappement.
6. Installation selon l'une des revendications 3 à 5, caractérisée en ce que l'organe de régulation est un dispositif de transfert (12) pour le flux partiel de gaz d'échappement à réintroduire.
7. Installation selon l'une des revendications 3 à 6, caractérisée en ce que la conduite de retour (8) débouche dans les coudes (3a, 3b) de la tubulure de gaz d'échappement.
EP88116975A 1987-10-30 1988-10-13 Procédé pour influer sur la température des gaz d'échappement et dispositif d'échappement pour réaliser ce procédé Expired - Lifetime EP0313922B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873736844 DE3736844A1 (de) 1987-10-30 1987-10-30 Verfahren zur beeinflussung der temperatur von abgasen und abgasanlage zur durchfuehrung des verfahrens
DE3736844 1987-10-30

Publications (2)

Publication Number Publication Date
EP0313922A1 EP0313922A1 (fr) 1989-05-03
EP0313922B1 true EP0313922B1 (fr) 1990-11-28

Family

ID=6339448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88116975A Expired - Lifetime EP0313922B1 (fr) 1987-10-30 1988-10-13 Procédé pour influer sur la température des gaz d'échappement et dispositif d'échappement pour réaliser ce procédé

Country Status (2)

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EP (1) EP0313922B1 (fr)
DE (2) DE3736844A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2655376B1 (fr) * 1989-12-06 1992-04-03 Peugeot Dispositif d'evacuation et de traitement anti-pollution de gaz d'echappement d'un moteur et procede correspondant.
DE4021495A1 (de) * 1990-07-05 1992-01-09 Schwaebische Huettenwerke Gmbh Abgasfilter
DE4127633A1 (de) * 1991-08-21 1993-02-25 Bayerische Motoren Werke Ag Mehrzylindrige brennkraftmaschine mit einer insbesondere katalytischen abgasreinigungsvorrichtung
DE19744191C2 (de) * 1996-09-30 2000-08-24 Leistritz Abgastech Abgaskatalysator
DE10051358A1 (de) * 2000-10-17 2002-06-20 Bosch Gmbh Robert Abgasreinigungsanlage mit einer Katalysatoranordnung und Verfahren zur Reinigung von Abgasen
JP4394868B2 (ja) * 2002-07-30 2010-01-06 日産自動車株式会社 エンジンの排気装置
EP3354873B1 (fr) * 2014-08-07 2024-01-03 S.T.C. S.r.l. Système de réduction des émissions nocives d'un moteur à combustion interne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56113007A (en) * 1980-02-08 1981-09-05 Toyota Motor Corp Exhaust gas purifier for internal combustion engine

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645098A (en) * 1970-09-28 1972-02-29 Gen Motors Corp Exhaust emission control
AU446214B2 (en) * 1971-03-12 1974-02-22 General Motors Corporation Internal combustion engine exhaust gas emission. control apparatus
GB1349051A (en) * 1971-07-19 1974-03-27 Ford Motor Co Internal combustion engine with an exhaust gas storage device in the exhaust system
DE2237781A1 (de) * 1972-08-01 1974-02-14 Volkswagenwerk Ag Brennkraftmaschine, insbesondere fuer kraftfahrzeuge, mit einer einrichtung zur beseitigung schaedlicher abgasbestandteile
US3776207A (en) * 1972-11-03 1973-12-04 Ford Motor Co Engine constant rate exhaust gas recirculation system
DE2303773A1 (de) * 1973-01-26 1974-08-01 Volkswagenwerk Ag Anordnung zur abgasfuehrung
BE836913A (fr) * 1975-12-22 1976-04-16 Systeme pour la reconvertion des gaz d'echappement en hydrocarbures
JPS53126422A (en) * 1977-04-11 1978-11-04 Nippon Soken Inc Exhaust gas purifying system in multi-cylinder internal combustion engine
DE3406968A1 (de) * 1984-02-25 1985-03-28 Daimler-Benz Ag, 7000 Stuttgart Verfahren zur erzeugung einer optimalen abgaseingangstemperatur fuer den abgaskatalysator von verbrennungsmotoren
DE3618762A1 (de) * 1985-06-13 1986-12-18 Volkswagen AG, 3180 Wolfsburg Abgasleitungsanordnung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56113007A (en) * 1980-02-08 1981-09-05 Toyota Motor Corp Exhaust gas purifier for internal combustion engine

Also Published As

Publication number Publication date
DE3736844C2 (fr) 1991-06-06
DE3736844A1 (de) 1989-05-11
DE3861184D1 (de) 1991-01-10
EP0313922A1 (fr) 1989-05-03

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