EP1870590A1 - Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement - Google Patents

Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement Download PDF

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Publication number
EP1870590A1
EP1870590A1 EP06425428A EP06425428A EP1870590A1 EP 1870590 A1 EP1870590 A1 EP 1870590A1 EP 06425428 A EP06425428 A EP 06425428A EP 06425428 A EP06425428 A EP 06425428A EP 1870590 A1 EP1870590 A1 EP 1870590A1
Authority
EP
European Patent Office
Prior art keywords
pipe
engine
exhaust gas
egr
pump
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Withdrawn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
EP06425428A
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German (de)
English (en)
Inventor
Dario Ivaldi
Roberto Bar
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
Priority to EP06425428A priority Critical patent/EP1870590A1/fr
Publication of EP1870590A1 publication Critical patent/EP1870590A1/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Withdrawn legal-status Critical Current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
    • F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
    • 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
    • F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream 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
    • F02M26/02—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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/14—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system
    • F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • 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
    • F02M26/21—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 with EGR valves located at or near the connection 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
    • F02M26/13—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

  • the present invention relates to internal combustion engines, of the type including at least one cylinder, a pipe for the intake of air into the cylinder, a pipe to discharge burnt gas from the cylinder, a compressor for the air sucked into the cylinder, interposed along the intake pipe, a turbine linked mechanically to the compressor, interposed along the exhaust pipe to be driven by the exhaust gas from the engine, a device to treat the exhaust gas, interposed along the exhaust pipe downstream of the turbine, and a pipe to recirculate exhaust gas in the engine, having an entrance extremity branching off the exhaust pipe, downstream of the device to treat the exhaust gas, and an exit extremity that flows into the inlet pipe, upstream of the compressor.
  • Engines of the type indicated at the beginning of this description use a pipe to recirculate exhaust gas of the so-called "long route" type, in which the exhaust gas is taken up downstream of the device to treat exhaust gas, and is returned upstream of the compressor.
  • the treatment device includes both a catalytic converter and a trap for particulates located downstream of the catalytic converter.
  • the exhaust gas taken up for recirculation is at relatively low pressure, so that we may also speak of low pressure EGR.
  • the butterfly valve enables the principal flow (respectively of exhaust gas or of fresh air) to be partialised and thus increases the pressure difference between the entrance extremity and the exit extremity of the exhaust gas recirculation pipe.
  • this solution in its turn is penalised by fuel consumption, since the constriction that is produced causes an increase in the pumping work of the engine and thus a reduction in its thermodynamic efficiency.
  • this system may not be sufficient to guarantee all the necessary recirculation.
  • the purpose of the present invention is to obviate against the above drawbacks by proposing a system for recirculating exhaust gas of the "long route" type which is able to guarantee a high flow of recirculated gas without lowering the efficiency of the engine.
  • the subject of the invention is an engine having all the characteristics that were indicated at the start of this description and also characterised in that a pump is included along the exhaust gas recirculation pipe.
  • the EGR pump is controlled by an adjustable-speed electric motor, to vary the EGR flow.
  • the EGR valve usually provided in the EGR circuit to adjust the quantity of EGR to be eliminated.
  • the electric motor operating the pump may indeed be controlled by an electronic control unit to vary the EGR flow as engine operating conditions vary, so that the pump may, if desired, be the sole means of regulating the quantity of EGR provided for in the engine.
  • EGR pump to regulate the flow of EGR provides a more rapid and precise control over EGR.
  • the electronic control system is also simplified since it must control a single device, that is the electric motor operating the pump, instead of two devices (butterfly and EGR valve) as in known systems.
  • the invention also has as its subject a procedure to control the quantity of EGR in an internal combustion engine based on controlling the speed of the motor operating an EGR pump.
  • number 1 indicates overall a diesel engine with four cylinders having an air intake manifold 2 and an exhaust manifold 3 respectively for the intake of air into the cylinders 4 of the engine and for the discharge of burnt gas from the cylinders 4.
  • the intake manifold 2 receives the air intake from a pipe 5.
  • the pipe 5 presents a mouth 5a for the intake of air and along it are also an air filter 6, an air flow meter 7, a butterfly valve 8, an EGR valve 9, a compressor 10, and an intercooler 22.
  • the compressor 10 is of the centrifugal type and is connected mechanically to a turbine 11 that is interposed along an exhaust pipe 12 that branches off the exhaust manifold 3, in order to drive the compressor 10.
  • a device 13 for treating exhaust gas comprising a catalytic converter 14 and a particulate trap 15.
  • a pipe 17 for exhaust gas recirculation (EGR) branches off, having an exit extremity that flows into the intake pipe 5 in correspondence with the EGR valve 9.
  • a cooler 18 is interposed along the pipe 17.
  • the known system illustrated in figure 1 is thus of the type with "long route" EGR, in which the exhaust gas is taken up at low pressure and relatively low temperature, downstream of the particulate trap 15, and returned upstream of the compressor 10.
  • the EGR valve 9, under electronic control, regulates the quantity of EGR in function of the engine operating conditions.
  • the butterfly valve is provided for the purpose of increasing the pressure difference existing between the entrance extremity and the exit extremity of the exhaust gas recirculation pipe 17.
  • the butterfly valve 8 may also the provided along the exhaust pipe 12, downstream of the zone 16.
  • FIGs 2 illustrates a first embodiment of the invention, in which the butterfly valve 8 is completely eliminated and a pump 19 is interposed along the EGR pipe 17, downstream of the cooler 18.
  • the EGR valve 9 that regulates the quantity of EGR is however maintained, the pump 19 being destined to create the necessary pressure difference to activate recirculation.
  • FIG. 3 illustrates a second, preferred, embodiment in which the EGR valve 9 is also eliminated.
  • the pump 19 is controlled by an electric motor 20 of the variable speed type.
  • the motor 20 is controlled by an electronic control unit 21 as a function of one or more signals S indicative of one or more engine operating parameters, such as engine speed, temperature of cooling water, temperature of metallic body of the engine, etc.
  • the pump 19 enables a higher flow of EGR to be achieved without further modifying the circuit, with consequent reduction of the discharge of nitrogen oxides. Elimination of the butterfly valve 8 enables the loss of efficiency of the engine that it would cause to be eliminated, with consequent reduction of fuel consumption.
  • the engine according to the invention operates with a higher air/fuel ratio, with consequent reduction in smoke in the exhaust, and the engine is also able to respond with greater flexibility and speed, providing the most appropriate quantity of EGR for every engine operating condition.
  • elimination of the EGR valve enables the plant to be simplified and its cost reduced, thanks to the elimination of both the butterfly valve and the EGR valve.
  • Use of a pump to regulate the quantity of EGR also provides more rapid and precise control over EGR.
  • the electronic control system is simplified, since it must only control one device, that is the pump, instead of two (the butterfly valve and the EGR valve).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
EP06425428A 2006-06-22 2006-06-22 Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement Withdrawn EP1870590A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06425428A EP1870590A1 (fr) 2006-06-22 2006-06-22 Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06425428A EP1870590A1 (fr) 2006-06-22 2006-06-22 Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement

Publications (1)

Publication Number Publication Date
EP1870590A1 true EP1870590A1 (fr) 2007-12-26

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EP06425428A Withdrawn EP1870590A1 (fr) 2006-06-22 2006-06-22 Moteur à combustion interne comprenant une pompe pour recycler des gaz d'échappement

Country Status (1)

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EP (1) EP1870590A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2918709A1 (fr) * 2007-07-12 2009-01-16 Renault Sas Moteur a combustion interne comportant des moyens pour favoriser la recirculation des gaz d'echappement.
GB2459694A (en) * 2008-05-01 2009-11-04 Ford Global Tech Llc Exhaust gas recirculation
FR2991725A1 (fr) * 2012-06-11 2013-12-13 Valeo Sys Controle Moteur Sas Ensemble comprenant un moteur thermique et un compresseur electrique
GB2540758A (en) * 2015-07-23 2017-02-01 Gm Global Tech Operations Llc A long route EGR system for a turbocharged automotive system
WO2020120614A3 (fr) * 2018-12-12 2020-08-06 Eaton Intelligent Power Limited Système de pompe rge et procédé de commande de pompe rge

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1186767A2 (fr) * 2000-09-11 2002-03-13 Toyota Jidosha Kabushiki Kaisha Système de recirculation de gaz d'échappement pour un moteur à combustion interne
US6435166B1 (en) * 1999-06-16 2002-08-20 Komatsu Ltd. Exhaust gas recirculation device and control method thereof
FR2840648A1 (fr) * 2002-06-11 2003-12-12 Inst Francais Du Petrole Dispositif et procede de controle de la recirculation des gaz d'echappement pour un moteur a combustion interne, notamment de type diesel
EP1493907A2 (fr) * 2003-07-02 2005-01-05 Mazda Motor Corporation Dispositiv de contrôle EGR pour moteurs à combustion interne
EP1589213A1 (fr) * 2004-04-21 2005-10-26 C.R.F. Società Consortile per Azioni Moteur diesel turbo-suralimenté avec système de recyclage des gaz d'échappement de grande longueur
EP1672208A2 (fr) * 2004-12-18 2006-06-21 Pierburg GmbH Système de recyclage des gaz d'échappement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6435166B1 (en) * 1999-06-16 2002-08-20 Komatsu Ltd. Exhaust gas recirculation device and control method thereof
EP1186767A2 (fr) * 2000-09-11 2002-03-13 Toyota Jidosha Kabushiki Kaisha Système de recirculation de gaz d'échappement pour un moteur à combustion interne
FR2840648A1 (fr) * 2002-06-11 2003-12-12 Inst Francais Du Petrole Dispositif et procede de controle de la recirculation des gaz d'echappement pour un moteur a combustion interne, notamment de type diesel
EP1493907A2 (fr) * 2003-07-02 2005-01-05 Mazda Motor Corporation Dispositiv de contrôle EGR pour moteurs à combustion interne
EP1589213A1 (fr) * 2004-04-21 2005-10-26 C.R.F. Società Consortile per Azioni Moteur diesel turbo-suralimenté avec système de recyclage des gaz d'échappement de grande longueur
EP1672208A2 (fr) * 2004-12-18 2006-06-21 Pierburg GmbH Système de recyclage des gaz d'échappement

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2918709A1 (fr) * 2007-07-12 2009-01-16 Renault Sas Moteur a combustion interne comportant des moyens pour favoriser la recirculation des gaz d'echappement.
WO2009010680A1 (fr) * 2007-07-12 2009-01-22 Renault S.A.S Moteur a combustion interne comportant des moyens pour favoriser la recirculation des gaz d'echappement
GB2459694A (en) * 2008-05-01 2009-11-04 Ford Global Tech Llc Exhaust gas recirculation
GB2459694B (en) * 2008-05-01 2012-04-25 Ford Global Tech Llc Exhaust gas recirculation
FR2991725A1 (fr) * 2012-06-11 2013-12-13 Valeo Sys Controle Moteur Sas Ensemble comprenant un moteur thermique et un compresseur electrique
WO2013186464A1 (fr) * 2012-06-11 2013-12-19 Valeo Systèmes de Contrôle Moteur Ensemble comprenant un moteur thermique et un compresseur electrique
US9657688B2 (en) 2012-06-11 2017-05-23 Valeo Systemes De Controle Moteur Assembly comprising a heat engine and an electric compressor
GB2540758A (en) * 2015-07-23 2017-02-01 Gm Global Tech Operations Llc A long route EGR system for a turbocharged automotive system
WO2020120614A3 (fr) * 2018-12-12 2020-08-06 Eaton Intelligent Power Limited Système de pompe rge et procédé de commande de pompe rge
US11698046B2 (en) 2018-12-12 2023-07-11 Eaton Intelligent Power Limited EGR pump system and control method of EGR pump

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