EP2402585B1 - Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne - Google Patents

Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne Download PDF

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Publication number
EP2402585B1
EP2402585B1 EP11179888.0A EP11179888A EP2402585B1 EP 2402585 B1 EP2402585 B1 EP 2402585B1 EP 11179888 A EP11179888 A EP 11179888A EP 2402585 B1 EP2402585 B1 EP 2402585B1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
channel
outflow
combustion engine
shows
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.)
Not-in-force
Application number
EP11179888.0A
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German (de)
English (en)
Other versions
EP2402585A1 (fr
Inventor
Alexander Fabrizius
Georg Feldhaus
Michael Schmidt
Klaus Irmler
Hans-Ulrich Steurer
Dr. Thierry Marimbordes
Pascal Noiseau
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.)
Mann and Hummel GmbH
Mahle Behr GmbH and Co KG
Original Assignee
Mann and Hummel GmbH
Mahle Behr GmbH and Co KG
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 Mann and Hummel GmbH, Mahle Behr GmbH and Co KG filed Critical Mann and Hummel GmbH
Priority to EP11179888.0A priority Critical patent/EP2402585B1/fr
Publication of EP2402585A1 publication Critical patent/EP2402585A1/fr
Application granted granted Critical
Publication of EP2402585B1 publication Critical patent/EP2402585B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/18Thermal insulation or heat protection
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system

Definitions

  • the invention relates to a device for exhaust gas recirculation for an internal combustion engine according to the preamble of claim 1.
  • the recirculation of exhaust gas of an internal combustion engine for example, to reduce pollutants is common in commercial vehicles and passenger cars.
  • increasing return rates are required, for example, to over 30%.
  • the recirculated exhaust gas can have very high temperatures, depending on the recirculation rate and the operating state. It is known and customary to provide the inflow of the recirculated exhaust gas into the combustion air in a metal plenum region (intake manifold).
  • the object of the invention is achieved for an aforementioned device by the characterizing features of claim 1.
  • the exhaust pipe in a region of its mouth into the channel as at least one pipe section with a plurality of exhaust ports for the exhaust gas along the pipe section, a division of the exhaust gas stream into a plurality of partial streams over a large spatial area is achieved.
  • excessive local heating for example, a wall of the channel, avoided and also improves the mixing of exhaust gas and air.
  • the exhaust pipe branches in the region of their confluence in a plurality of pipe sections, whereby a particularly uniform distribution of the exhaust gas is achieved.
  • the outflow openings are distributed according to number and / or size over a length of the pipe section such that a hydraulic outflow cross section per unit length of the pipe section increases in the flow direction of the exhaust gas.
  • flow obstacles are arranged on at least some of the outflow openings, whereby a swirling achieved and / or a preferred outflow direction can be specified. In this way, a harmful heat input, for example, in the walls of the channel can be additionally avoided.
  • the outflow openings at least predominantly in an outflow angle of between 45 ° and 135 °, in particular between 90 ° and 135 °, are aligned with a main flow direction of the air in the channel.
  • the exhaust gas recirculation apparatus according to the first embodiment (FIG. Fig. 1 ) comprises a designed as a perforated aluminum plate mounting member 2, which is set over a side opening of a compressed combustion air leading channel 1.
  • the determination of the channel can be made arbitrarily, such as by gluing, positive recording or screwing.
  • the mounting member has a central opening 2a, in which an exhaust pipe 3 made of a temperature-resistant material, such as stainless steel, is introduced, so that the exhaust gas (dashed arrow) flows into the channel for mixing with the combustion air (solid arrows).
  • the position of the inflow into the channel 1 is upstream of a charge air cooler.
  • a flange 4 is provided, by means of which the mounting member 2 and the exhaust pipe 3 are sealingly connected together. For this purpose, there is a seal 5 between flange 4 and mounting member 2.
  • the flange 4 is by means of screws (not shown), the corresponding bolt holes 4a, 2b pass through the flange and mounting member, releasably secured.
  • a coolant channel 6 is provided on it, which rotates the opening 2a.
  • the coolant channel 6 is located on the opposite side of the flange 4 and is formed as a round pipe.
  • the coolant channel 6 consists in the present case of aluminum and is soldered flat on the plate 2. Its (not shown) connection to a coolant circuit can be done by simply attaching hoses on its ends 6a.
  • the coolant circuit may be, for example, the cooling circuit of the internal combustion engine or else a separate or connected low-temperature cooling circuit.
  • the coolant channel 6 is here formed by a patch on the mounting plate, the mounting member 2 through open sheet metal part 6b, so that the mounting member 2 forms a part of the wall of the coolant channel 6.
  • the molded part 6b is connected in a planar manner to the mounting member 2, wherein, for example, one of the parts may be formed from a solder-plated metal sheet.
  • Fig. 6 shows by way of example, which course the sheet metal part 6b can give the coolant channel 6.
  • terminals 6a are also provided for the coolant circuit.
  • coolant channel 6 and flange 4 are arranged from the same side of the mounting member 2.
  • the flange 4 sits with its seal 5 directly on the sheet metal part 6b, so that a particularly good and actively cooled insulation between flange 4 and 2 mounting member is given.
  • Fig. 7a is shown that the sheet metal part can also be composed of several sections 6b, 6c.
  • the coolant channel is shaped so that it includes the fastening screws 2b for the flange. As a result, these thermal bridges are actively cooled.
  • the device according to the invention is constructed in the same unit with an indirect or coolant-flow intercooler 7 with air-flowed and coolant-flow-through flat tubes 9, which are in the immediate vicinity of the Exhaust pipe is located.
  • a bottom 8 of the intercooler 7 is enlarged or formed so that it comprises an opening 8a for the exhaust pipe 3.
  • a collector cover 10 is formed accordingly.
  • a cooling channel 6 in a deep-drawn sheet metal part, for example.
  • a cooling duct 6 is not necessarily provided in this embodiment, since an active cooling of the exhaust pipe 3 is already given due to the punching through of the collector.
  • a coolant channel 6 is formed with a connection 6a, wherein the connection 6a is at the same time a connection of the intercooler to the coolant circuit.
  • Fig. 11 shows an example Fig. 9, Fig. 10 Similar embodiment of the invention, in which the exhaust pipe 3 opens directly into a charge air cooler 7.
  • a flange 4 of the exhaust pipe 3 is seated on a collector box 10 sealingly, wherein the collector box 10 rotates a swept by the exhaust pipe 3 and not flowed around by the coolant recess 11.
  • the header box 10 may be considered as a whole as a coolant passage for the exhaust pipe.
  • the protruding into the intercooler 7 exhaust pipe 3 is formed as a pipe section 12 having a plurality of radially directed exhaust ports 13 for the exhaust gas.
  • the exhaust gas is divided into a plurality of small partial flows, so that local overheating of components of the charge air cooler 7 is avoided.
  • such a pipe section 12 can also lead, while maintaining these advantages, into a simple channel 1, see, for example, the first exemplary embodiment.
  • the pipe section 12 is closed at the end, being received with its closed end in a seal 14 in an opening of the bottom 8 opposite the inlet-side bottom 8 '.
  • the pipe section can also protrude freely into the intercooler 7.
  • a branching of the exhaust gas line into a plurality of, in the present case three, tube sections 12 occurs, as a result of which an even more distributed outflow of the exhaust gas is achieved.
  • the branching takes place inside the charge air cooler behind the recess 11 or the inlet-side bottom 8.
  • This example relates to a further development of an exhaust pipe with 3 with pipe section 12 as in the example Fig. 11 ,
  • the outflow openings 13 are formed over the course of the pipe section 12 with increasing spatial density (see upper cut edge of the pipe section 12) or with an increasing cross-sectional area at the same distance (see lower cut edge of the pipe section 12).
  • this achieves the result that a hydraulic outflow cross section per unit length of the pipe section 12 increases in the flow direction, so that the pressure drop of the exhaust gas associated with the outflow is compensated. Overall, this results in a more uniform mass flow of the outflowing exhaust gas over the length of the pipe section 12.
  • Flow obstacles 15 over at least some the discharge openings 13 are provided.
  • the flow obstacles 15 are designed as pushed-on sheet-metal rings which, at the points of overlap with the outflow openings 13, comprise dimensioned and erected tabs.
  • the tabs or flow obstacles 15 are shaped differently and / or placed.
  • Fig. 15 shows for clarity four sections through the four in Fig. 14 shown metal rings together with respective section of a plan view of the tabs.
  • Fig. 16 the flows of charge air (solid lines) and from a pipe section 12 inflowing exhaust gas (dashed lines) are shown, wherein the outflow openings are each arranged at different angles to the plane of symmetry or main flow direction of the charge air.
  • a too compact exhaust plume is formed at too small angles (e.g., 0 °) as well as too large angles (e.g., 180 °). This means a poorer mixing and the risk of local overheating of components of the charge air duct or intercooler.
  • an angle to the geometric flow direction of the charge air (in the figures in each case horizontally from right to left) is selected for the outflow 13, which is between 45 ° and 135 °, preferably between 90 ° and 135 °.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (3)

  1. Dispositif de recyclage de gaz d'échappement pour un moteur à combustion interne, comprenant
    une conduite de gaz d'échappement (3) servant au guidage de gaz d'échappement, et
    un conduit (1) servant à l'alimentation d'air fourni au moteur à combustion interne,
    où la conduite de gaz d'échappement (3) débouche dans le conduit (1),
    caractérisé en ce que la conduite de gaz d'échappement (3), dans une zone de son débouché dans le conduit (1), est conçue comme au moins une partie tubulaire (12), où une pluralité d'ouvertures d'évacuation (13) prévues pour les gaz d'échappement est configurée le long de la partie tubulaire (12), où les ouvertures d'évacuation (13) sont réparties sur une longueur de la partie tubulaire (12), en fonction du nombre et / ou de la taille, de manière telle qu'une section d'évacuation hydraulique, par unité de longueur de la partie tubulaire (12), augmente dans la direction d'écoulement des gaz d'échappement, de sorte que la chute de pression des gaz d'échappement, liée à l'évacuation, est compensée, où la conduite de gaz d'échappement (3), dans la zone de son débouché, se ramifie en une pluralité de parties tubulaires (12).
  2. Dispositif selon la revendication 1, caractérisé en ce que des obstacles à l'écoulement (15) sont disposés sur au moins certaines des ouvertures d'évacuation (13).
  3. Dispositif selon l'une des revendications 1 ou 2, caractérisé en ce que les ouvertures d'évacuation (13) sont orientées, au moins pour la plupart, suivant un angle d'évacuation compris entre 45° et 135°, en particulier entre 90° et 135°, par rapport à une direction principale d'écoulement de l'air dans le conduit (1).
EP11179888.0A 2009-02-12 2009-02-12 Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne Not-in-force EP2402585B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11179888.0A EP2402585B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11179888.0A EP2402585B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne
EP09290103.2A EP2218897B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation de gaz d'échappement pour un moteur à combustion interne

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP09290103.2 Division 2009-02-12
EP09290103.2A Division-Into EP2218897B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation de gaz d'échappement pour un moteur à combustion interne
EP09290103.2A Division EP2218897B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation de gaz d'échappement pour un moteur à combustion interne

Publications (2)

Publication Number Publication Date
EP2402585A1 EP2402585A1 (fr) 2012-01-04
EP2402585B1 true EP2402585B1 (fr) 2015-12-16

Family

ID=40848710

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09290103.2A Not-in-force EP2218897B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation de gaz d'échappement pour un moteur à combustion interne
EP11179888.0A Not-in-force EP2402585B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation des gaz d'échappement pour un moteur à combustion interne

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP09290103.2A Not-in-force EP2218897B1 (fr) 2009-02-12 2009-02-12 Dispositif de recirculation de gaz d'échappement pour un moteur à combustion interne

Country Status (2)

Country Link
US (1) US8534267B2 (fr)
EP (2) EP2218897B1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9080694B2 (en) * 2011-06-22 2015-07-14 The Boeing Company Bulkhead fitting assembly
US9222447B2 (en) * 2012-07-26 2015-12-29 Ford Global Technologies, Llc Charge air cooler control system and method
DE102014201935A1 (de) 2014-02-04 2015-08-20 Mahle International Gmbh Anordnung zur Abgasrückführung

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US6237336B1 (en) * 1999-11-09 2001-05-29 Caterpillar Inc. Exhaust gas recirculation system in an internal combustion engine and method of using same

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DE3916466C2 (de) * 1989-05-20 1996-03-14 Audi Ag Vorrichtung zur Abgasrückführung
JP3430815B2 (ja) * 1996-09-18 2003-07-28 日産自動車株式会社 内燃機関の排気還流装置
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Also Published As

Publication number Publication date
US20100199650A1 (en) 2010-08-12
EP2218897B1 (fr) 2014-07-09
EP2218897A1 (fr) 2010-08-18
EP2402585A1 (fr) 2012-01-04
US8534267B2 (en) 2013-09-17

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