WO2001090561A1 - Procede et dispositif de recyclage des gaz d'echappement et moteur diesel suralimente - Google Patents

Procede et dispositif de recyclage des gaz d'echappement et moteur diesel suralimente Download PDF

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Publication number
WO2001090561A1
WO2001090561A1 PCT/SE2001/001085 SE0101085W WO0190561A1 WO 2001090561 A1 WO2001090561 A1 WO 2001090561A1 SE 0101085 W SE0101085 W SE 0101085W WO 0190561 A1 WO0190561 A1 WO 0190561A1
Authority
WO
WIPO (PCT)
Prior art keywords
venturi
channel
egr
port
engine
Prior art date
Application number
PCT/SE2001/001085
Other languages
English (en)
Inventor
Ove Spontón
Original Assignee
Scania Cv Ab
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 Scania Cv Ab filed Critical Scania Cv Ab
Priority to AU2001260900A priority Critical patent/AU2001260900A1/en
Priority to EP01934746A priority patent/EP1299634A1/fr
Publication of WO2001090561A1 publication Critical patent/WO2001090561A1/fr

Links

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
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
    • F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
    • 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
    • F02M26/02—EGR systems specially adapted for supercharged engines
    • F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
    • F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics

Definitions

  • This invention concerns a method and a device according to the preambles of claims 1 and 5, respectively. It also concerns a supercharged diesel engine including such a device.
  • exhaust gases are taken from a position before an exhaust turbine in the exhaust system and is recycled to a position after an intake air compressor which is arranged in the intake system.
  • exhaust gases are taken from a position after the exhaust, turbine and -are recycled to a position before the intake air compressor.
  • US-A-5 611 203 and US-A-5 611 204 could be mentioned as previously known art with respect to this invention.
  • These documents describe how exhaust gases are recycled to the intake in turbo-supercharged diesel engines through a venturi device or- any- other kind of ejector being placed in the intake channel .
  • the system according to these documents uses the low static pressure prevailing in a certain section of the ejector device for pumping-in an EGR flow into the charged air.
  • venturi devices When venturi devices are used as pump means for transferring EGR gases in supercharged four-stroke combustion engines, in some operational cases such pressure conditions prevail in the engine that the negative pressure in the venturi is not sufficient. In practice the maximum available negative pressure in a venturi is limited by the sonic speed of the medium.
  • venturi devices are constructed with a chamber surrounding the injection area. This chamber thus functions as a pressure source. This construction however results in transition losses to and from the chamber as well as loss of efficiency when the EGR gas is sucked into the intake air.
  • the main purpose of the invention is thus to provide an effective and cost- saving solution to the task of transferring EGR gases.
  • the chamber is thus replaced with a channel having a contraction for accelerating EGR gases.
  • the flow losses of the EGR gases are reduced up to the venturi, further the impulse loss in the venturi itself is reduced, since the EGR gases already from the start has got a higher speed.
  • the pulse energy in the EGR gases is also utilised more effectively.
  • the contraction being chosen such that at the inlet in the venturi device of the EGR gases, these have been accelerated to a speed which essentially -corresponds to the speed of the intake air in this area, optimised feed with minimised losses is achieved.
  • Fig. 1 diagrammatically shows an embodiment of the invention in connection with a turbo-supercharged diesel engine
  • Fig. 2 shows in more detail a device according to a first embodiment of the invention
  • Fig. 3 show ' s a device ' according to a- second embodiment of the invention.
  • Fig. 1 shows diagrammatically a combustion engine 1 of the piston engine type with cylinders arranged in a straight inline cylinder block.
  • the engine is a four-stroke diesel engine adapted for a heavy vehicle such as a truck or a bus .
  • Each cylinder is in its respective cylinder head in a conventional not in detail shown manner provided with at least one intake valve for supply of combustion air and at least one exhaust valve for discharging of exhaust gases from the combustion.
  • An intake channel 2 leads the intake air to the cylinders whereas an exhaust collector 3 leads the exhaust gases from the cylinders to the turbine T and subsequently to the exhaust pipe .
  • a transfer channel 4 is arranged for recycling EGR gases from the exhaust side of the cylinders to their intake side.
  • the transfer channel 4 debouches in the intake channel 2 after a charging air cooler 5 and before a manifold to the cylinders.
  • An EGR control valve 6 is positioned in the transfer channel whereby the transfer may be disconnected and possibly controlled to a certain extent.
  • the transfer channel 4 debouches in a section of the intake channel wherein venturi 9 is arranged in such a way that the flow of intake gases, which are charged by the compressor C, is modified so as to create a negative pressure at the passage of the venturi. This is because the air at the passage of a convex curved portion will be given an increased speed.
  • the EGR gases are thus led into said section in a portion in connection with -the venturi where thus a negative pressure prevails.
  • Fig. 2 the venturi 9 is shown in more detail from where diagrammatically the construction is shown with a contraction portion 10, a mixing section 11 and a diffuser portion 12.
  • the intake air flows, as seen in the Figure, from the left to the right.
  • an EGR channel 13 debouches, which includes a contraction 14 for accelerating the EGR gases before intake into the venturi 9.
  • the port 15 of the channel 13 is directed essentially in the flow direction R of the main flow.
  • the venturi in this Figure is constructed with rectangular sections across the plane of the paper. I.e. in planes parallel with the plane of .the drawing venturi sections are essentially identical.
  • Fig. 3 shows an embodiment, wherein the venturi is rotary- symmetrical around the axis A-A. Further, the elements corresponding to the ones in Fig. 2 are shown.
  • the contraction portion is denoted 10', the mixing section 11', the diffuser portion 12', the EGR channel 13', the contraction 14' and the port 15' .
  • the negative pressure in the port 15' is hereby essentially proportional to the radius R ⁇ 4 , where R is the narrowest section of the venturi.
  • the venturi may thus be given another design than the one shown. It should however be stressed that the region of the port 15' should be constructed with respect to i.a. the relation between the radiuses R x and R 2 with the - intention to have the least possible loss .
  • R 2 is the radius of the mixing section after the port of the EGR channel.
  • the diffuser portion is to be carefully tested in order to avoid that disturbing vortices are formed through diversion of the gas flow along the walls.
  • the construction of the port is likely to be denoted as a slot 15 and 15' respectively, which may be straight (for example Fig. 2) or curved (for example Fig. " 3) .
  • the device is adjustable, for example by the walls V and V 2 in Fig. 2 being mutually displaceable for variation of the contraction 14.

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)

Abstract

La présente invention concerne un procédé et un dispositif de recyclage des gaz d'échappement d'un moteur à combustion (1). En l'occurrence, les gaz de recyclage sont introduits dans le canal d'admission (2) du moteur par un dispositif venturi après avoir été accélérés. A cet effet, l'orifice (15) du canal de recyclage (13) dans le dispositif de venturi est orienté de façon à introduire les gaz de recyclage essentiellement selon le sens de circulation (R) de l'air d'admission. L'invention concerne également un moteur diesel suralimenté comportant un tel dispositif.
PCT/SE2001/001085 2000-05-22 2001-05-16 Procede et dispositif de recyclage des gaz d'echappement et moteur diesel suralimente WO2001090561A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2001260900A AU2001260900A1 (en) 2000-05-22 2001-05-16 Method and device for exhaust recycling and supercharged diesel engine
EP01934746A EP1299634A1 (fr) 2000-05-22 2001-05-16 Procede et dispositif de recyclage des gaz d'echappement et moteur diesel suralimente

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0001898-6 2000-05-22
SE0001898A SE522787C2 (sv) 2000-05-22 2000-05-22 Förfarande och anordning för avgasrecirkulering i en förbränningsmotor samt dylik överladdad dieselmotor

Publications (1)

Publication Number Publication Date
WO2001090561A1 true WO2001090561A1 (fr) 2001-11-29

Family

ID=20279780

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2001/001085 WO2001090561A1 (fr) 2000-05-22 2001-05-16 Procede et dispositif de recyclage des gaz d'echappement et moteur diesel suralimente

Country Status (4)

Country Link
EP (1) EP1299634A1 (fr)
AU (1) AU2001260900A1 (fr)
SE (1) SE522787C2 (fr)
WO (1) WO2001090561A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959778A1 (fr) * 2010-05-05 2011-11-11 Peugeot Citroen Automobiles Sa Ensemble comportant un compresseur de suralimentation et ses conduits d'alimentation en air et en gaz d'echappement recycles, et moteur dote d'un tel ensemble

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996748A (en) * 1974-05-15 1976-12-14 Etat Francais Supercharged internal combustion engines
US5611203A (en) * 1994-12-12 1997-03-18 Cummins Engine Company, Inc. Ejector pump enhanced high pressure EGR system
WO1999040312A1 (fr) * 1998-02-04 1999-08-12 Volvo Lastvagnar Ab Systeme destine a un moteur a combustion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3996748A (en) * 1974-05-15 1976-12-14 Etat Francais Supercharged internal combustion engines
US5611203A (en) * 1994-12-12 1997-03-18 Cummins Engine Company, Inc. Ejector pump enhanced high pressure EGR system
WO1999040312A1 (fr) * 1998-02-04 1999-08-12 Volvo Lastvagnar Ab Systeme destine a un moteur a combustion

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2959778A1 (fr) * 2010-05-05 2011-11-11 Peugeot Citroen Automobiles Sa Ensemble comportant un compresseur de suralimentation et ses conduits d'alimentation en air et en gaz d'echappement recycles, et moteur dote d'un tel ensemble

Also Published As

Publication number Publication date
SE0001898L (sv) 2001-11-23
EP1299634A1 (fr) 2003-04-09
SE0001898D0 (sv) 2000-05-22
SE522787C2 (sv) 2004-03-09
AU2001260900A1 (en) 2001-12-03

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