WO2019022453A1 - Système pour la recirculation de gaz d'échappement de moteur - Google Patents

Système pour la recirculation de gaz d'échappement de moteur Download PDF

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Publication number
WO2019022453A1
WO2019022453A1 PCT/KR2018/008275 KR2018008275W WO2019022453A1 WO 2019022453 A1 WO2019022453 A1 WO 2019022453A1 KR 2018008275 W KR2018008275 W KR 2018008275W WO 2019022453 A1 WO2019022453 A1 WO 2019022453A1
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WIPO (PCT)
Prior art keywords
line
exhaust gas
exhaust
engine
bypass
Prior art date
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Ceased
Application number
PCT/KR2018/008275
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English (en)
Korean (ko)
Inventor
조자윤
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.)
HD Hyundai Infracore Co Ltd
Original Assignee
Doosan Infracore Co Ltd
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Publication date
Application filed by Doosan Infracore Co Ltd filed Critical Doosan Infracore Co Ltd
Priority to CN201880049790.9A priority Critical patent/CN110998081B/zh
Publication of WO2019022453A1 publication Critical patent/WO2019022453A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • F02M26/02—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
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/61—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure
    • 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
    • F02M26/52—Systems for actuating EGR valves
    • F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
    • F02M26/61—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure
    • F02M26/615—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to exhaust pressure the exhaust back pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to an exhaust gas recirculation system of an engine. More particularly, the present invention relates to an exhaust gas recirculation system for an engine provided with a dual EGR device.
  • An exhaust gas recirculation (EGR) apparatus, an exhaust gas post-treatment apparatus, or the like can be used to cope with exhaust emission regulation of a diesel engine.
  • EGR exhaust gas recirculation
  • the exhaust gas recirculation device there are a high pressure exhaust gas recirculation (HP-EGR) and a low pressure exhaust gas recirculation (LP-EGR).
  • HP-EGR high pressure exhaust gas recirculation
  • LP-EGR low pressure exhaust gas recirculation
  • a dual EGR (Dual EGR) device using both high-pressure-EGR and low-pressure-EGR may be employed to apply a large-capacity EGR while reducing pumping loss. Meanwhile, in order to increase the efficiency of the exhaust gas after-treatment apparatus, it is important to raise the temperature of the front end of the after-treatment system.
  • An object of the present invention is to provide an exhaust gas recirculation system for an engine that can apply a large amount of EGR while reducing the pumping loss and can increase the efficiency of the exhaust gas post-treatment apparatus.
  • an exhaust gas recirculation system for an internal combustion engine including an intake line connected to an engine to supply intake air, a portion of exhaust gas exhausted from the engine, A turbocharger having a turbine installed in the exhaust line and a compressor installed in the intake line, a post-treatment device installed in the exhaust line on the downstream side of the turbine and for post-treating the exhaust gas, Pressure EGR device for recirculating a part of the exhaust gas discharged from the downstream side of the treatment device through the post-treatment device to the engine, and a low-pressure EGR device connected to the engine for discharging another part of the exhaust gas discharged from the engine to the outside , A bypass line connected to the exhaust line between the downstream side of the turbine and the downstream side of the post-treatment device And an exhaust gas bypass device for supplying another portion of the exhaust gas to the post-treatment apparatus via the bypass line without passing through the turbine.
  • the engine includes a first exhaust manifold in which exhaust gas discharged from at least one first cylinder is discharged and combined, and a second exhaust manifold in which exhaust gas discharged from at least one second cylinder is discharged A second exhaust manifold, the exhaust line connected to the first exhaust manifold, and the bypass line connected to the second exhaust manifold.
  • the exhaust gas bypass device may include a connection line connecting the bypass line to the exhaust line on the upstream side of the turbine.
  • the exhaust gas bypass device includes an exhaust backpressure control valve installed in the connection line, for controlling an amount of the exhaust gas branched from the bypass line and merged into the exhaust line, And a bypass valve installed in the bypass line for controlling an amount of the exhaust gas supplied to the post-treatment apparatus.
  • the exhaust gas recirculation system of the engine may include an exhaust gas recirculation system connected to the outlets of the first exhaust manifold and the second exhaust manifold, for discharging exhaust gas from the first and second exhaust manifolds, Further comprising a branching unit to which the gas is merged, and the exhaust lines and the inlets of the bypass line may be respectively connected to the branching unit.
  • the exhaust gas recirculation system of the engine further includes a high-pressure EGR device, wherein the high-pressure EGR device includes a high-pressure EGR line connecting the exhaust line and the intake line on the upstream side of the turbine, Pressure EGR valve installed in the high-pressure EGR line and regulating the amount of the recirculated exhaust gas.
  • the high-pressure EGR device includes a high-pressure EGR line connecting the exhaust line and the intake line on the upstream side of the turbine, Pressure EGR valve installed in the high-pressure EGR line and regulating the amount of the recirculated exhaust gas.
  • the high pressure EGR line may connect the intake line on the upstream side of the exhaust line and the intercooler installed downstream of the compressor.
  • the low-pressure EGR apparatus includes a low-pressure EGR line connecting the exhaust line and the intake line on the downstream side of the post-processing apparatus, and a low-pressure EGR line provided on the low- An exhaust gas recirculation system for an engine including a low pressure EGR valve.
  • the exhaust gas recirculation system of the engine may further include an intercooler that cools the intake air that has passed through the compressor.
  • the exhaust gas recirculation system of the engine further includes a high-pressure EGR device, wherein the high-pressure EGR device includes a high-pressure EGR line connecting the bypass line and the intake line, And a high-pressure EGR valve installed to regulate the amount of the recirculated exhaust gas.
  • the exhaust gas bypass device may include a connection line connecting the bypass line and the exhaust line on an upstream side of the turbine, a branch line installed in the connection line, branched from the bypass line, And a bypass valve installed in the exhaust line and controlling an amount of the exhaust gas supplied to the post-treatment apparatus, wherein the bypass valve controls the amount of the exhaust gas to be introduced into the high-pressure EGR line May be connected to the bypass line on the upstream side of the connection line.
  • a part of the exhaust gas discharged from the engine is supplied to the after-treatment device via the exhaust line via the turbine of the turbocharger, and another part of the exhaust gas discharged from the engine is supplied to the bypass line To the post-treatment apparatus without passing through the turbine.
  • the high-temperature exhaust gas is directly supplied to the post-treatment apparatus without passing through the turbine, so that the post-treatment efficiency can be improved. Also, even if a relatively inexpensive fixed geometry turbocharger (FGT) equipped with an exhaust back pressure control valve and a bypass valve is used, desired performance can be secured.
  • FGT fixed geometry turbocharger
  • a large-capacity low-pressure-EGR can be applied. Accordingly, since the intake throttle valve is not used, the pumping loss can be minimized, and the intake throttle valve can also be removed.
  • FIG. 1 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • FIG. 2 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • FIG. 3 is a block diagram illustrating an exhaust gas recirculation system for an engine according to exemplary embodiments.
  • FIG. 4 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • FIG. 5 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • the terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • FIG. 1 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • an exhaust gas recirculation system for an engine includes an intake line 30 for supplying intake air to the engine 10, an exhaust line 40 for exhausting a part of the exhaust gas discharged from the engine 10 to the outside, A turbocharger 60 for compressing the air supplied to the engine 10 by using a part of the exhaust gas and a turbocharger 60 for recirculating a part of the exhaust gas upstream of the turbine 62 of the turbocharger 60 to the engine 10 A post-treatment device 80 for purifying the exhaust gas downstream of the turbine 62 of the turbocharger 60, another part of the exhaust gas discharged from the engine 10, a first EGR device 70 (high-pressure EGR device) And an exhaust gas bypass device for directly supplying a part of the exhaust gas downstream of the post-treatment device 80 to the engine 10 without passing through the turbine 62 to the post- And an EGR device 90 (low pressure EGR device).
  • an intake line 30 for supplying intake air to the engine 10
  • an exhaust line 40 for exhausting a part of the exhaust gas discharged from the engine 10 to the outside
  • the engine 10 may include a diesel engine as a drive source of a construction machine, such as an excavator.
  • the engine 10 may be an industrial large diesel engine.
  • the engine 10 may include a plurality of cylinders 12a, 12b having combustion chambers for combusting fuel supplied from a fuel injecting apparatus (not shown).
  • the engine 10 may include a first cylinder group and a second cylinder group.
  • the first cylinder group may have at least one first cylinder 12a and the second cylinder group may have at least one second cylinder 12b.
  • the first cylinder group and the second cylinder group include, but are not limited to, three cylinders, for example, the first cylinder group includes four cylinders and the second cylinder group includes two cylinders .
  • the engine 10 may include an intake manifold 20 connected to the first and second cylinders 12a and 12b to supply intake air.
  • the engine 10 includes a first exhaust manifold 22a connected to the first cylinders 12a and for discharging the exhaust gas discharged from the first cylinders 12a to the outside and a second exhaust manifold 22b connected to the second cylinders 12b, And a second exhaust manifold 22b connected to the second cylinders 12b for discharging the exhaust gas discharged from the second cylinders 12b to the outside.
  • the intake line 30 is connected to the intake manifold 12 of the engine 10 to supply the intake air and the exhaust line 40 is connected to the first exhaust manifold 22a of the engine 10, A part of the exhaust gas discharged from the engine can be discharged to the outside.
  • the turbocharger 60 may include a turbine 62, a compressor 64, and a shaft 66 connecting them.
  • the turbine 62 may be installed in the exhaust line 40 while the compressor 64 may be installed in the intake line 30. [ When the turbine 62 is driven by the flow of the exhaust gas, the turbine 62 can drive the compressor 64 via the shaft 66. The compressor 64 can compress the sucked air to increase the suction amount.
  • the turbocharger 30 may be a variable geometry turbocharger (VGT), a wastegate turbocharger (WGT), a fixed geometry turbocharger (FGT), or the like.
  • VVT variable geometry turbocharger
  • WT wastegate turbocharger
  • FGT fixed geometry turbocharger
  • the air having passed through the compressor 64 can be supplied to the intake manifold 20 of the engine 10 through the intake line 30.
  • An intercooler 32 is provided in the intake line 30 at the outlet side of the compressor 64 to cool the sucked air passing through the compressor 64 and to supply it to the intake manifold 20.
  • the intercooler 32 lowers the temperature of the inhaled air to increase the mass of the same volume, thereby increasing the amount of oxygen.
  • an appropriate mixture ratio of fuel and air can be implemented in the engine 10, thereby improving the combustion efficiency and improving the engine output.
  • the first EGR apparatus (high-pressure EGR apparatus) 70 can recycle a part of the exhaust gas to the engine 10 on the upstream side of the turbine 62.
  • the first EGR device 70 includes a first EGR line 72 connecting the exhaust line 40 on the upstream side of the turbine 62 and the intake line 30 on the outlet side of the compressor 64, And a first EGR cooler 76 installed in the first EGR line 72 for cooling the recirculated exhaust gas.
  • the first EGR cooler 76 is installed in the first EGR line 72 and controls the amount of the recirculated exhaust gas, .
  • the post-treatment apparatus 80 may be installed in the exhaust line 40 on the downstream side of the turbine 62 to post-treat the exhaust gas.
  • the post-treatment apparatus 80 may include a diesel oxidation catalyst apparatus (DOC), a selective reduction catalyst (SCR) apparatus, and the like.
  • DOC diesel oxidation catalyst apparatus
  • SCR selective reduction catalyst
  • the diesel oxidation catalyst device can purify carbon monoxide, hydrocarbons, and soluble organic fractions contained in the exhaust gas.
  • the selective reduction catalyst (SCR) apparatus can catalytically react the nitrogen oxide in the exhaust gas with the reducing agent to reduce the nitrogen oxide to nitrogen and water harmless to the human body.
  • the second EGR apparatus (low pressure EGR apparatus) 90 can recycle a part of the exhaust gas discharged from the post-treatment apparatus 80 through the post-treatment apparatus 80 to the engine 10 on the downstream side.
  • the second EGR device 90 includes a second EGR line 92 for connecting the exhaust line 40 on the downstream side of the post-treatment device 80 and the intake line 30 on the upstream side of the compressor 64, A second EGR valve 94 installed in the second EGR line 92 for regulating the amount of the recirculated exhaust gas and a second EGR cooler 96 installed in the second EGR line 92 for cooling the recirculated exhaust gas .
  • the second EGR line 92 can connect the exhaust line 40 on the downstream side of the post-treatment device 80 and the intake line 30 on the upstream side of the intake throttle valve 34. Therefore, the second EGR device 90 can supply a part of the exhaust gas downstream of the post-treatment device 80 to the intake line 30 on the upstream side of the intake throttle valve 34.
  • the exhaust gas bypass device may include a bypass line 50 for supplying another portion of the exhaust gas from the engine 10 to the post-treatment device 80 .
  • One end of the bypass line 50 is connected to the second exhaust manifold 22b of the engine 10 and the other end of the bypass line 50 is connected between the downstream side of the turbine 62 and the downstream side of the post- The exhaust line 40 of FIG.
  • the exhaust gas discharged through the second exhaust manifold 22b is guided through the bypass line 50 to the exhaust line 40 between the downstream side of the turbine 62 and the downstream side of the post-treatment device 80 , And can be supplied directly to the post-treatment apparatus 80 without passing through the turbine 62.
  • the exhaust gas bypass device is installed in a connection line 51 connecting the bypass line 50 and the exhaust line 40 on the upstream side of the turbine 62 and is connected to the exhaust line 40, And a bypass valve 54 provided in the bypass line 50 for controlling the amount of the exhaust gas supplied to the post-treatment device 80 have.
  • the exhaust gas discharged from the engine 10 through the second exhaust manifold 22b is exhausted from the exhaust line 52 on the upstream side of the turbine 62 while the exhaust back pressure control valve 52 is opened and the bypass valve 54 is closed, (40) and may be supplied to the turbine (62).
  • the exhaust gas discharged from the first exhaust manifold 22a is partially supplied to the first EGR line 72, and the remaining part thereof is combined with the exhaust gas discharged from the second exhaust manifold 22b Can be supplied from the post-turbine 62.
  • the exhaust gas recirculation system of the engine may include an engine control unit (ECU) (not shown) for performing dual EGR control.
  • the control unit may receive signals relating to an engine rpm, an engine torque, a velocity, a throttle valve, an air amount, and the like.
  • the control unit may receive a signal relating to the temperature of the exhaust gas supplied from the post-treatment device 80 from the temperature sensor 82 provided on the exhaust line upstream of the post-treatment device 80.
  • the control unit may receive signals relating to the pressure from the pressure sensors 83 provided at the front and rear ends of the post-processing apparatus 80.
  • the control unit can control the ratio of recirculating the first EGR valve 64 and the second EGR valve 74 to the engine 10 as EGR gas, that is, the EGR rate, based on the signals, it is possible to control the load percentage of the engine 10 at the rpm, that is, the engine output rate.
  • control unit can control the opening and closing of the exhaust back pressure control valve 52 and the bypass valve 54 based on the signals, and perform the exhaust gas bypass control.
  • the control unit performs the exhaust gas bypass control to control the exhaust gas discharged from one or more cylinders among a plurality of cylinders, that is, a part of the exhaust gas discharged from the engine, to the turbine 62 It can be directly supplied to the post-treatment apparatus 80 without passing through.
  • the control unit can perform the exhaust gas bypass control by closing the exhaust backpressure control valve 52 and opening the bypass valve 54 have.
  • the exhaust gas bypass control another part of the exhaust gas discharged from the engine 10 through the second exhaust manifold 22b flows through the bypass line 50 without passing through the turbine 62 Can be supplied to the processing device (80).
  • the high-temperature exhaust gas is directly supplied to the post-treatment apparatus 80 without passing through the turbine 62, so that the post-treatment efficiency can be improved.
  • a large-capacity LP-EGR can be applied. Accordingly, the pumping loss can be minimized and the intake throttle valve 34 can be removed.
  • FIG. 2 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • the exhaust gas recirculation system is substantially the same as the exhaust gas recirculation system described with reference to Fig. 1, except for the configuration of adding a branch unit. Accordingly, the same constituent elements are denoted by the same reference numerals, and repetitive description of the same constituent elements is omitted.
  • the exhaust gas recirculation system of the engine may further include a branch unit 24 for distributing the exhaust gas discharged from the engine 10.
  • the engine 10 includes a first exhaust manifold 22a for discharging the exhaust gas discharged from the first cylinders 12a to the outside and a second exhaust manifold 22b for discharging the exhaust gas discharged from the second cylinders 12b to the outside And a second exhaust manifold 22b for the second exhaust manifold 22b.
  • the inlet of the branching unit 24 may be connected to the outlet of the first exhaust manifold 22a and the second exhaust manifold 22b. Therefore, the exhaust gas discharged from the first and second exhaust manifolds 22a, 22b can be merged in the branching unit 24.
  • the inlet of the exhaust line 40 and the bypass line 50 may be connected to the branch unit 24, respectively.
  • a part of the exhaust gas supplied to the branching unit 24 can be supplied to the post-processing device 80 after being supplied to the turbine 62 through the exhaust line 40, Another portion of the exhaust gas may be fed directly to the post-treatment unit 80 via the bypass line 50.
  • a first valve 46 is provided in the exhaust line 40 to regulate the amount of exhaust gas discharged through the exhaust line 40.
  • a second valve 56 is provided in the bypass line 50, The amount of exhaust gas discharged through the line 50 can be adjusted.
  • the first and second valves 46 and 56 can prevent back pressure interference between the exhaust line 40 and the bypass line 50.
  • the branching unit 24 may be equipped with valves that perform a similar function to at least one of the first and second valves 46, 56. At least one of the first and second valves 46, 56 may be omitted when at least one valve is incorporated in the branch unit 24.
  • FIG. 3 is a block diagram illustrating an exhaust gas recirculation system for an engine according to exemplary embodiments.
  • the exhaust gas recirculation system is substantially the same as the exhaust gas recirculation system described with reference to Fig. 1, except for the arrangement of the first EGR apparatus. Accordingly, the same constituent elements are denoted by the same reference numerals, and repetitive description of the same constituent elements is omitted.
  • the first EGR line 72 of the first EGR device 70 is connected to the exhaust line 30 on the downstream side of the intercooler 32 and is connected to the turbocharger 60 A part of the exhaust gas upstream of the turbine 62 of the engine 10 can be recirculated directly to the engine 10 without passing through the intercooler 32.
  • the first EGR line 72 can connect the exhaust line 40 on the upstream side of the turbine 62 and the intake line 30 on the outlet side of the intercooler 32. A part of the exhaust gas discharged from the first exhaust manifold 22a of the engine 10 is supplied to the intake manifold 20 of the engine 10 via the first EGR line 72 without passing through the intercooler 32 ). ≪ / RTI >
  • the first EGR valve 74 is installed in the first EGR line 72 and can regulate the amount of the recirculated exhaust gas.
  • the first EGR cooler 76 is installed in the first EGR line 72 and can cool the recycle exhaust gas.
  • FIG. 4 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • the exhaust gas recirculation system is substantially the same as the exhaust gas recirculation system described with reference to FIG. 1, except that the first EGR line is connected to a bypass line rather than an exhaust line. Accordingly, the same constituent elements are denoted by the same reference numerals, and repetitive description of the same constituent elements is omitted.
  • the first EGR line 72 of the first EGR apparatus 70 (high pressure EGR apparatus) may be connected to the bypass line 50.
  • the total amount of the exhaust gas discharged from the engine 10 through the first exhaust manifold 22a can be supplied to the post-treatment apparatus 80 after driving the turbine 62 to the turbine 62.
  • a part of the exhaust gas discharged from the second exhaust manifold 22b can be branched sequentially through the first EGR line 72 and the connecting line 51, and the remaining exhaust gas, which is not branched,
  • the exhaust gas may be supplied upstream of the first exhaust manifold 80 and merged with the exhaust gas discharged from the first exhaust manifold 22a.
  • the turbine 62 can be driven unaffected from the first EGR device 70 and can reduce the influence from the turbine 62 at the time of exhaust gas flow to the first EGR device 70 have.
  • FIG. 5 is a block diagram illustrating an exhaust gas recirculation system for an engine in accordance with exemplary embodiments.
  • the exhaust gas recirculation system is substantially the same as the exhaust gas recirculation system described with reference to Fig. 1, except that the connection line of the exhaust gas bypass device is connected to the exhaust line upstream of the point where the first EGR line is connected Do. Accordingly, the same constituent elements are denoted by the same reference numerals, and repetitive description of the same constituent elements is omitted.
  • connection line 51 of the exhaust gas bypass device may be connected to the exhaust line 40 on the upstream side of the point where the first EGR line 72 is connected.
  • connection line 51 may be connected to the exhaust line 40 at the point where the first EGR line 72 is connected.
  • intercooler 34 intake throttle valve
  • Temperature sensor 90 Second EGR device

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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)
  • Supercharger (AREA)

Abstract

L'invention concerne un système pour la recirculation de gaz d'échappement d'un moteur, lequel système comprend : une ligne d'admission reliée à un moteur de façon à délivrer de l'air d'admission ; une ligne d'échappement reliée au moteur de façon à décharger vers l'extérieur une partie de gaz d'échappement déchargés à partir du moteur ; un turbocompresseur ayant une turbine disposée dans la ligne d'échappement et un compresseur disposé dans la ligne d'admission ; un dispositif de post-traitement disposé dans la ligne d'échappement du côté inférieur de la turbine de façon à post-traiter les gaz d'échappement ; un dispositif de recirculation de gaz d'échappement basse pression pour faire recirculer vers le moteur une partie des gaz d'échappement déchargés à travers le dispositif de post-traitement du côté inférieur du dispositif de post-traitement ; et un dispositif de dérivation de gaz d'échappement relié au moteur de façon à délivrer, sans traverser la turbine, l'autre partie des gaz d'échappement, qui sont déchargés à partir du moteur, à travers une ligne de dérivation, au dispositif de post-traitement.
PCT/KR2018/008275 2017-07-24 2018-07-23 Système pour la recirculation de gaz d'échappement de moteur Ceased WO2019022453A1 (fr)

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Citations (5)

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