EP0857870A2 - Moteur à combustion du type diesel avec recirculation de gaz d'échappement et dispositif de mélange des gaz recirculés - Google Patents

Moteur à combustion du type diesel avec recirculation de gaz d'échappement et dispositif de mélange des gaz recirculés Download PDF

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Publication number
EP0857870A2
EP0857870A2 EP98830044A EP98830044A EP0857870A2 EP 0857870 A2 EP0857870 A2 EP 0857870A2 EP 98830044 A EP98830044 A EP 98830044A EP 98830044 A EP98830044 A EP 98830044A EP 0857870 A2 EP0857870 A2 EP 0857870A2
Authority
EP
European Patent Office
Prior art keywords
circulation
conduit
intake manifold
exhaust gases
gases
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.)
Withdrawn
Application number
EP98830044A
Other languages
German (de)
English (en)
Other versions
EP0857870A3 (fr
Inventor
Silvio C.R.F. Soc. Consortile per Azioni Canale
Germano C.R.F. Soc. Consortile per Azioni Bonetto
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.)
Centro Ricerche Fiat SCpA
Original Assignee
Centro Ricerche Fiat SCpA
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 Centro Ricerche Fiat SCpA filed Critical Centro Ricerche Fiat SCpA
Publication of EP0857870A2 publication Critical patent/EP0857870A2/fr
Publication of EP0857870A3 publication Critical patent/EP0857870A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system

Definitions

  • the present invention relates to internal combustion Diesel engines, of the known type comprising:
  • the engines of the above indicated type are able to decrease the nitrogen oxide emissions efficiently, due to the re-circulation of a portion of the exhaust gases into the intake manifold.
  • the oxygen fraction is reduced, as well as the maximum temperatures reached during combustion, which are both factors important for the formation of nitrogen oxides.
  • the reduction of the oxygen fraction in the intake add mixture generally causes an increase of the smoke emitted by the engine. For this reason, it is necessary to carefully control the level of the exhaust gases re-circulation. In particular, it is necessary to meter the total re-circulation level correctly as well as to assure a uniform distribution of the re-circulation gases cylinder by cylinder.
  • numeral 1 generally designates a Diesel engine comprising a plurality of cylinders, A, B, C, D, E in-line, which receive the intake air from respective brackets 3 of an intake manifold 4, having an inlet conduit 5.
  • Reference numeral 6 generally designates the exhaust manifold, comprising a plurality of brackets 7 which receive the exhaust gases coming out of the engine cylinders and from which there extends a conduit 8 for exhaust gas re-circulation having one end connected to the exhaust manifold 6 (through a valve of a known type, not shown, which is electronically controlled to assure the proper quantity of exhaust gas re-circulation) and the other end opening into the inlet conduit 5 of the intake manifold 4.
  • a valve of a known type, not shown which is electronically controlled to assure the proper quantity of exhaust gas re-circulation
  • the gases tend to remain separate, above all in conditions of high speed, from the intake air, while staying adjacent to the portion of the wall of conduit 5 which is located on the side opposite with respect to the area where conduit 8 opens.
  • the gases tend to remain adjacent to this wall until they reach the opposite end of the intake manifold, without mixing with the air.
  • the re-circulation exhaust gases tend to fill more the cylinders of the engine which are more far away with respect to the area where the re-circulation conduit 8 opens, while filling less those cylinders which are closer to this area.
  • This solution is shown in the diagram of figure 5 which shows the re-circulation percentage for each cylinder and for each average value of re-circulation of the exhaust gases into the engine.
  • the various lines in the diagram relate to the various cylinders and show how the re-circulation of the exhaust gases is lower in the cylinders which are closer to the merging point of the re-circulation conduit 8.
  • the object of the present invention is that of overcoming the above-mentioned drawback.
  • the invention provides an internal combustion Diesel engine of the type indicated at the beginning, characterized in that the end of the re-circulation conduit for the exhaust gases which is connected to the intake manifold opens on an annular chamber surrounding a portion of the inlet conduit of the intake manifold which is communicated thereto through a plurality of apertures.
  • the above-mentioned apertures are uniformly distributed along the circumferencial wall of said portion of the inlet conduit of the intake manifold.
  • the exhaust gases which merge into the intake manifold are compelled to mix with the air at the inlet of the intake manifold before proceeding further towards the cylinders, so that the uniformity of gas re-circulation into the various cylinders of the engine is assured.
  • the above-mentioned portion of the inlet conduit of the intake manifold which is surrounded by the annular chamber on which the re-circulation conduit opens is provided in form of a Venturi conduit.
  • the main features of the engine according to the present invention lies in that the conduit 8 for re-circulation of the exhaust gases does not open directly on the inlet conduit 5 of the intake manifold 4, as in the case of the engine according to the prior art shown in figure 1.
  • the conduit 8 opens on an annular chamber 9 surrounding a portion 10 of conduit 5.
  • the annular chamber 9 communicates with the inner passage of conduit 10 through a plurality of apertures 11 (see also figure 3) uniformly distributed in the circumferencial direction. In this manner, the exhaust gases coming from conduit 8 are compelled to be mixed with the intake air at the inlet of manifold 4 before proceeding further towards the cylinders of the engine, so that a uniform distribution of the exhaust gases among the various cylinders is assured.
  • the preferred embodiment of the invention provides a conduit 10 in form of a Venturi conduit.
  • a conduit 10 in form of a Venturi conduit.
  • the minimum cross-section of the Venturi conduit is not to jeopardize the volumetric efficiency of the engine and not to reduce the maximum performance.
  • Figure 3 shows the case in which the Venturi conduit 10 is made by an insert mounted within the section 12 of the intake manifold, in which there is formed a transverse hole 13 for inserting the re-circulation conduit 8.
  • the Venturi conduit 10 could be made in one piece with the intake manifold.
  • the apertures 11 are in number of four, each extending throughout an angle of a little less than 90° along the circumferencial direction of the throttling section of the Venturi conduit 10.
  • any other shape of conduit 10 and apertures 11 is possible.
  • figure 4 shows the case of a conduit 10 which is not in form of Venturi and has a plurality of circular apertures 11 which are angularly distributed along circumferencial direction.
  • Figure 6 is a diagram corresponding to that of figure 5 which has been already described above, which is made by testing the engine according to the invention. As shown, the lines corresponding to the re-circulation of the exhaust gases in the various cylinders of the engine are substantially coincident.
  • the engine according to the invention solves therefore simply and efficiently the problem of uniform distribution of the re-circulation of the exhaust gases in the various cylinders of a Diesel engine, while obtaining, in the case of the preferred embodiment which makes use of a Venturi conduit, an increase of the re-circulation capability, due to the vacuum which is generated at the Venturi throttling section, without adding further devices, and while reducing the noise coming from the intake.

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 Gas After Treatment (AREA)
EP98830044A 1997-02-11 1998-01-30 Moteur à combustion du type diesel avec recirculation de gaz d'échappement et dispositif de mélange des gaz recirculés Withdrawn EP0857870A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO970100 1997-02-11
IT97TO000100A IT1291509B1 (it) 1997-02-11 1997-02-11 Motore a combustione a ciclo diesel, con ricircolo dei gas di scarico, provvisto di dispositivo miscelatore dei gas di ricircolo.

Publications (2)

Publication Number Publication Date
EP0857870A2 true EP0857870A2 (fr) 1998-08-12
EP0857870A3 EP0857870A3 (fr) 1999-05-12

Family

ID=11415335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98830044A Withdrawn EP0857870A3 (fr) 1997-02-11 1998-01-30 Moteur à combustion du type diesel avec recirculation de gaz d'échappement et dispositif de mélange des gaz recirculés

Country Status (2)

Country Link
EP (1) EP0857870A3 (fr)
IT (1) IT1291509B1 (fr)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1020632A1 (fr) * 1999-01-15 2000-07-19 Renault V.I. Collecteur d'admission comportant des moyens de raccordement à un circuit de recyclage des gaz d'échappement
EP1004767A3 (fr) * 1998-11-27 2000-11-22 Nissan Motor Co., Ltd. Système de recirculation de gaz d'échappement pour moteur à combustion
GB2356223A (en) * 1999-11-09 2001-05-16 Caterpillar Inc Induction venturi for an exhaust gas recirculation (EGR) system in an i.c. engine
WO2001079680A1 (fr) * 2000-04-17 2001-10-25 Robert Bosch Gmbh Dispositif de melange et de dosage de flux gazeux dans des moteurs a combustion interne
EP1116874A3 (fr) * 2000-01-12 2002-05-29 Henricus Geradus Procédé pour alimenter un moteur à combustion en mélange air-carburant et dispositif pour mettre en oeuvre ce procédé
US6439212B1 (en) 2001-12-19 2002-08-27 Caterpillar Inc. Bypass venturi assembly and elbow with turning vane for an exhaust gas recirculation system
EP1264981A1 (fr) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mélangement de courants fluides
DE10118490C2 (de) * 2000-04-17 2003-03-27 Mitsubishi Motors Corp Anordnung des Ansaugsystems für eine Brennkraftmaschine mit EGR-Einrichtung
US6640542B2 (en) 2001-12-20 2003-11-04 Caterpillar Inc Bypass venturi assembly with single shaft actuator for an exhaust gas recirculation system
US6659092B2 (en) 2001-12-20 2003-12-09 Caterpillar Inc Bypass assembly with annular bypass venturi for an exhaust gas recirculation system
FR2901579A1 (fr) * 2006-05-24 2007-11-30 Peugeot Citroen Automobiles Sa Dispositif ameliore d'introduction de gaz d'echappement recircules dans un conduit d'admission d'un moteur thermique
DE102007035556A1 (de) 2007-07-28 2009-01-29 Daimler Ag Mischvorrichtung zum Zumischen eines Abgasrückführstroms in einen Ladeluftstrom einer Brennkraftmaschine
EP2236804A1 (fr) * 2009-03-31 2010-10-06 Iveco S.p.A. Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement
US7845340B2 (en) 2006-12-22 2010-12-07 Cummins Inc. Air-exhaust mixing apparatus
US20120180478A1 (en) * 2011-01-18 2012-07-19 GM Global Technology Operations LLC Exhaust gas recirculation system for an internal combustion engine
ITRM20130103A1 (it) * 2013-02-22 2014-08-23 Piaggio & C Spa Sistema di aspirazione dell'aria e di ricircolo dei gas di scarico per un motore diesel
US20170314516A1 (en) * 2016-04-28 2017-11-02 Hyundai Motor Company Engine system for exhausting condensate water
US10415516B2 (en) * 2016-04-28 2019-09-17 Hyundai Motor Company Engine system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4420247B4 (de) * 1994-06-10 2004-03-04 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Abgasrückführungseinrichtung für Verbrennungsmotoren, insbesondere mit Plastesaugrohren
DE69612420T2 (de) * 1995-03-14 2001-07-26 Cummins Engine Co., Inc. Turboaufgeladene Dieselbrennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1004767A3 (fr) * 1998-11-27 2000-11-22 Nissan Motor Co., Ltd. Système de recirculation de gaz d'échappement pour moteur à combustion
US6272851B1 (en) 1998-11-27 2001-08-14 Nissan Motor Co., Ltd. Exhaust recirculation system of internal combustion engine
FR2788565A1 (fr) * 1999-01-15 2000-07-21 Renault Vehicules Ind Collecteur d'admission comportant des moyens de raccordement a un circuit de recyclage des gaz d'echappement
EP1020632A1 (fr) * 1999-01-15 2000-07-19 Renault V.I. Collecteur d'admission comportant des moyens de raccordement à un circuit de recyclage des gaz d'échappement
GB2356223B (en) * 1999-11-09 2003-11-12 Caterpillar Inc Induction venturi for an exhaust gas recirculation system in an internal combustion engine
GB2356223A (en) * 1999-11-09 2001-05-16 Caterpillar Inc Induction venturi for an exhaust gas recirculation (EGR) system in an i.c. engine
US6267106B1 (en) 1999-11-09 2001-07-31 Caterpillar Inc. Induction venturi for an exhaust gas recirculation system in an internal combustion engine
EP1116874A3 (fr) * 2000-01-12 2002-05-29 Henricus Geradus Procédé pour alimenter un moteur à combustion en mélange air-carburant et dispositif pour mettre en oeuvre ce procédé
WO2001079680A1 (fr) * 2000-04-17 2001-10-25 Robert Bosch Gmbh Dispositif de melange et de dosage de flux gazeux dans des moteurs a combustion interne
DE10118490C2 (de) * 2000-04-17 2003-03-27 Mitsubishi Motors Corp Anordnung des Ansaugsystems für eine Brennkraftmaschine mit EGR-Einrichtung
EP1264981A1 (fr) * 2001-06-05 2002-12-11 Holset Engineering Company Limited Mélangement de courants fluides
US6439212B1 (en) 2001-12-19 2002-08-27 Caterpillar Inc. Bypass venturi assembly and elbow with turning vane for an exhaust gas recirculation system
US6640542B2 (en) 2001-12-20 2003-11-04 Caterpillar Inc Bypass venturi assembly with single shaft actuator for an exhaust gas recirculation system
US6659092B2 (en) 2001-12-20 2003-12-09 Caterpillar Inc Bypass assembly with annular bypass venturi for an exhaust gas recirculation system
FR2901579A1 (fr) * 2006-05-24 2007-11-30 Peugeot Citroen Automobiles Sa Dispositif ameliore d'introduction de gaz d'echappement recircules dans un conduit d'admission d'un moteur thermique
US7845340B2 (en) 2006-12-22 2010-12-07 Cummins Inc. Air-exhaust mixing apparatus
DE102007035556A1 (de) 2007-07-28 2009-01-29 Daimler Ag Mischvorrichtung zum Zumischen eines Abgasrückführstroms in einen Ladeluftstrom einer Brennkraftmaschine
EP2236804A1 (fr) * 2009-03-31 2010-10-06 Iveco S.p.A. Dispositif de mélange de gaz en particulier pour les moteurs à combustion interne équipés d'un système de recirculation des gaz d'échappement
US20120180478A1 (en) * 2011-01-18 2012-07-19 GM Global Technology Operations LLC Exhaust gas recirculation system for an internal combustion engine
CN102606347A (zh) * 2011-01-18 2012-07-25 通用汽车环球科技运作有限责任公司 用于内燃发动机的排气再循环系统
US8689553B2 (en) * 2011-01-18 2014-04-08 GM Global Technology Operations LLC Exhaust gas recirculation system for an internal combustion engine
ITRM20130103A1 (it) * 2013-02-22 2014-08-23 Piaggio & C Spa Sistema di aspirazione dell'aria e di ricircolo dei gas di scarico per un motore diesel
WO2014128026A1 (fr) * 2013-02-22 2014-08-28 Piaggio & C. S.P.A. Système d'aspiration d'air et de recirculation des gaz d'échappement pour un moteur diesel
CN105074190A (zh) * 2013-02-22 2015-11-18 比亚乔公司 用于柴油机的空气抽吸和废气再循环系统
CN105074190B (zh) * 2013-02-22 2017-10-24 比亚乔公司 用于柴油机的空气抽吸和废气再循环系统
US20170314516A1 (en) * 2016-04-28 2017-11-02 Hyundai Motor Company Engine system for exhausting condensate water
US10415516B2 (en) * 2016-04-28 2019-09-17 Hyundai Motor Company Engine system

Also Published As

Publication number Publication date
ITTO970100A1 (it) 1998-08-11
IT1291509B1 (it) 1999-01-11
EP0857870A3 (fr) 1999-05-12

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