WO2016048018A2 - Appareil de recirculation des gaz d'échappement - Google Patents

Appareil de recirculation des gaz d'échappement Download PDF

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Publication number
WO2016048018A2
WO2016048018A2 PCT/KR2015/009978 KR2015009978W WO2016048018A2 WO 2016048018 A2 WO2016048018 A2 WO 2016048018A2 KR 2015009978 W KR2015009978 W KR 2015009978W WO 2016048018 A2 WO2016048018 A2 WO 2016048018A2
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WO
WIPO (PCT)
Prior art keywords
reflux
exhaust gas
unit
engine
gas recirculation
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Application number
PCT/KR2015/009978
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English (en)
Korean (ko)
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WO2016048018A3 (fr
Inventor
안효근
강길환
Original Assignee
대동공업 주식회사
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Application filed by 대동공업 주식회사 filed Critical 대동공업 주식회사
Publication of WO2016048018A2 publication Critical patent/WO2016048018A2/fr
Publication of WO2016048018A3 publication Critical patent/WO2016048018A3/fr

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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
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • 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 apparatus, and more particularly, to an exhaust gas recirculation apparatus for reducing nitrogen oxide (NOx) contained in the exhaust gas by refluxing part of the exhaust gas to the engine intake side.
  • NOx nitrogen oxide
  • Exhaust gas emitted from engines using diesel as fuel contains a large amount of harmful components such as CO, HC, and NO x .
  • exhaust gas recirculation is applied to general diesel engines in order to reduce emissions such as NO x generated by the combination of oxygen and nitrogen in a high temperature and high pressure environment.
  • the exhaust gas recirculation apparatus is generally a technique for realizing a reduction of NO x by introducing a part of the exhaust gas discharged into the atmosphere after engine combustion back to the intake side.
  • NO x is reduced by lowering the combustion temperature by lowering the density of the mixed air and the concentration of oxygen without changing the air-fuel ratio.
  • the amount of exhaust gas refluxed to the intake side in the exhaust gas recirculation unit determines the combustion state of the fuel and has a very important influence on the NO x and particulate matter (PM) emissions. Therefore, in the conventional exhaust gas recirculation apparatus, the apparatus is configured to control the amount of exhaust gas returned from the engine exhaust side to the intake side by using an electronic EGR valve.
  • the technical problem to be solved by the present invention is to provide an exhaust gas recirculation apparatus capable of realizing NOx (nitrogen oxide) reduction to satisfy the exhaust gas regulation while excluding the use of the electronic EGR valve.
  • the present invention in the exhaust gas recirculation device (EGR system) for reducing the NOx (nitrogen oxide) contained in the exhaust gas by recirculating a portion of the exhaust gas to the intake side, for exhaust gas recirculation
  • EGR system for reducing the NOx (nitrogen oxide) contained in the exhaust gas by recirculating a portion of the exhaust gas to the intake side
  • a reflux portion forming a reflux path, wherein the reflux portion includes a reflux jacket on one side of an engine cylinder head in which an inflow pipe and an inlet of the exhaust manifold communicate
  • An EGR valve unit installed at the reflux jacket outlet;
  • the EGR valve unit Formed with a diameter equal to or less than the inner diameter of the joint, the EGR valve unit provides an exhaust gas re
  • At least one or more of the gaskets interposed between the components constituting the reflux portion may be formed to have a diameter smaller than the inner diameter of the joint portion between the components.
  • the reflux unit may further include an EGR cooler unit installed between the reflux tube and the reflux jacket, in which case a reflux hole is formed between the reflux tube and the EGR cooler unit and between the EGR cooler unit and the reflux jacket.
  • the gasket may be interposed, and the diameter of the reflux hole formed in the gasket may be equal to or smaller than the inner diameter of the joint portion in which the gasket is installed.
  • the EGR valve unit applied to the present invention may be a temperature sensitive valve including a thermally expandable material whose volume changes according to the temperature change of the heat source.
  • the valve rod is drawn out according to the thermal expansion of the thermally expandable material and the exhaust gas movement passage is opened therein, and the valve rod is returned to its original position by the thermal contraction of the thermally expandable substance and the restoring force of the restoring spring, and the movement passage is closed. It may be a configuration.
  • the EGR valve unit, the valve body and the exhaust gas passage is formed;
  • a temperature sensitive actuator having a cylinder accommodating the thermal expansion material and having an operation rod for linearly moving according to thermal expansion or thermal contraction of the thermal expansion material to operate the valve rod;
  • a heat exchange cover having an inlet through which the heat source flows in and an outlet through which the heat source flows out, and surrounding the cylinder to form a heat exchange chamber between the cylinders.
  • the heat source for operating the EGR valve unit may be engine coolant or engine oil.
  • the exhaust gas recirculation apparatus According to the exhaust gas recirculation apparatus according to the embodiment of the present invention, it is possible to achieve a high level of NO x reduction that can satisfy the enhanced exhaust gas regulation without using an expensive electronic EGR valve, and an expensive electronic EGR valve. By eliminating the use of, it is possible to significantly reduce the cost of constructing an exhaust gas recirculation unit for NO x reduction.
  • the mechanical structure eliminates the electronic EGR valve, there is no electrical error, so stable NO x reduction performance can be achieved continuously, and the temperature-sensitive EGR valve that controls the opening and closing of the reflux passage according to the temperature change can be obtained.
  • the application also eliminates the problem of generating soot and hydrocarbons (THC) during cold operation.
  • FIG. 1 is a perspective view showing a cylinder head of a diesel engine to which an exhaust gas recirculation apparatus according to the present invention is applied;
  • FIG. 2 is an exploded perspective view of the exhaust gas recirculation apparatus according to the present invention applied to the engine cylinder head of FIG.
  • FIG 3 is a combined perspective view of the exhaust gas recirculation apparatus according to the present invention.
  • FIG. 4 is a front view of the exhaust gas recirculation apparatus shown in FIG. 3 as viewed from the engine exhaust manifold side;
  • FIG. 5 is a side view of the exhaust gas recirculation apparatus according to FIG. 4.
  • FIG. 6 is a plan view of the exhaust gas recirculation apparatus shown in FIG. 3.
  • FIG. 6 is a plan view of the exhaust gas recirculation apparatus shown in FIG. 3.
  • Figure 7 is an enlarged view of the main portion according to the first preferred embodiment of the exhaust gas recirculation apparatus according to the present invention.
  • Figure 8 is an enlarged view of the main portion according to a second preferred embodiment of the exhaust gas recirculation apparatus according to the present invention.
  • FIG. 9 is an enlarged view of a main part according to a third preferred embodiment of the exhaust gas recirculation apparatus according to the present invention.
  • FIG. 10 is an enlarged view illustrating main parts according to a fourth preferred embodiment of the exhaust gas recirculation apparatus according to the present invention.
  • FIG. 11 is an enlarged view of a main part according to a fifth preferred embodiment of the exhaust gas recirculation apparatus according to the present invention.
  • FIG. 12 is a schematic configuration diagram of a temperature sensitive EGR valve unit applied to an exhaust gas recirculation apparatus according to the present invention.
  • FIG. 1 is a perspective view of a cylinder head of an engine to which an exhaust gas recirculation apparatus for reducing NO x according to the present invention is applied.
  • an exhaust gas recirculation apparatus for reducing NO x according to the present invention is applied.
  • an intake manifold 2 is installed at an intake side of a cylinder head 1 of an upper portion of an engine.
  • a turbocharger 6 is provided upstream of the intake manifold 2 based on the advancing direction of the intake air.
  • the intake manifold 2 has a known configuration, and a pipe unit 44 constituting the exhaust gas recirculation device is connected in the middle of a pipeline connecting the turbocharger 6 and the intake manifold 2 to each other.
  • a part of the exhaust gas discharged from the exhaust manifold 3 (see FIG. 2 to be described later) opposite to the intake manifold 2 is supplied to the intake manifold 2 through the pipe unit 44. That is, some of the exhaust gas discharged after the engine combustion is recycled (hereinafter referred to as 'reflux') from the exhaust side of the engine to the intake side through the pipe unit 44.
  • An intake manifold flange 46 is provided between the intake manifold 2 and the conduit 5 extending from the turbocharger 6, and the pipe unit 44 is connected to the middle of the intake manifold flange 46. . Therefore, the high temperature and high pressure intake compressed through the turbocharger 6 and the reflux exhaust gas supplied through the pipe unit 44 meet at the intake manifold flange 46 and mix with each other.
  • the intake air in which the exhaust gas is evenly mixed through the intake manifold flange 46 flows to the intake manifold 2 and is evenly sequentially supplied to the plurality of combustion chambers via the intake manifold 2.
  • the temperature of the intake air and the oxygen concentration decrease, thereby reducing the emission such as NO X during combustion.
  • Reference numeral 9 denotes an air control valve installed on the intake pipe, and the intake control valve 9 is directed toward the intake air, specifically, from the turbocharger 6 to the intake manifold 2.
  • the pipe unit 44 is installed on the intake line upstream of the exhaust gas introduction position supplied by the pipe unit 44 to adjust the intake amount.
  • reference numeral 10 denotes a generator for power generation
  • 11 denotes an oil strainer
  • 12 denotes a fuel filter
  • FIG. 2 to 6 are views of the exhaust gas recirculation apparatus according to the present invention applied to the engine cylinder head portion of FIG. 1, with reference to these figures applied to the present invention is applied to implement the exhaust gas reflux from the exhaust side to the intake side
  • the exhaust gas recirculation apparatus according to the present invention will be described in detail.
  • the exhaust gas recirculation apparatus in the following description of the exhaust gas recirculation apparatus according to the present invention with reference to the drawings will be described taking as an example a configuration including an EGR cooler unit as a component constituting the reflux.
  • the EGR cooler unit may be omitted in some cases.
  • the reflux tube 30, which will be described later, may be directly connected to the reflux jacket 42 on one side of the cylinder head to configure the reflux portion.
  • the exhaust gas recirculation apparatus includes a reflux portion 4 connecting the engine exhaust side and the intake side.
  • the reflux part 4 connects the intake manifold 2 located on the opposite side to the exhaust manifold 3 on one side of the engine, so that some of the high-temperature exhaust gas discharged through the exhaust manifold 3 after combustion is exhausted.
  • a reflux path is formed to allow reflux to the manifold 2.
  • the reflux portion 4 of the present invention has a mechanical structure so that the exhaust gas can naturally flow back to the intake side by the pressure difference between the intake and exhaust.
  • the reflux portion 4 is composed of a plurality of units, and the gaskets 7A, 7B, 7C, 7D, and 7E are provided one by one at the joint portion to which the units are interconnected.
  • the reflux unit 4 specifically includes an EGR cooler unit 40 and a reflux jacket 42, an EGR valve unit 43, and the pipe unit 44 described above.
  • the EGR cooler 40 is a well-known configuration to cool the exhaust gas flowing through the internal flow passage to the appropriate temperature by flowing the coolant, the reflux jacket 42 is the cylinder 436a when manufacturing the head casting 436a
  • the head 1 is formed on one side.
  • a reflux tube 30 for exhaust gas reflux is branched on one side of the exhaust manifold 3, and an inlet part 402 of one side of the EGR cooler 40 is connected to the reflux tube.
  • the other outlet portion 404 of the EGR cooler 40 is connected to the inlet portion of the exhaust manifold 3 connected to the inlet of the reflux jacket 42 on one side of the head 4 of the cylinder 436a when assembled. ).
  • An inlet portion of one side of the EGR valve unit 43 is connected to an outlet portion opposite to the inlet portion of the reflux jacket 42 that is connected to the inlet portion of the EGR cooler 40, and the pipe unit of the other outlet portion of the EGR valve unit 43.
  • the inlet of one end of 44 is connected.
  • the outlet of the other end of the pipe unit 44 is connected to the EGR pipe connecting portion 47 formed in the middle of the intake manifold flange 46.
  • at least one of the gaskets has a diameter of the return hole of the gasket that is smaller than the inner diameter of the joint between the components 30, 40, 42, 43, 44, 46 on which the gasket is installed. .
  • the reflux hole 70 formed in each of the gaskets 7A, 7B, 7C, 7D, and 7E is formed to have a diameter smaller than or equal to the inner diameter of the corresponding joint part, and the recirculation hole 70 having a diameter smaller than the inner diameter of the corresponding joint part is formed.
  • the reflux amount (EGR rate) of the exhaust gas refluxed from the exhaust side to the intake side is adjusted by the reflux hole 70 of at least one of the gaskets 7A to 7E formed with the above.
  • the present invention is formed by reducing the diameter of the at least one gasket of the gasket (7A, 7B, 7C, 7D 7E) interposed between the components constituting the exhaust gas recirculation device smaller than the other portion,
  • the exhaust gas reflux can be realized in an amount sufficient to satisfy the exhaust gas regulation using only the pressure difference between the gas and the exhaust gas.
  • the gasket includes a gasket 7A interposed between the EGR cooler unit 40 and the reflux tube 30, a gasket 7B between the EGR cooler unit 40 and the reflux jacket 42, and a reflux jacket 42.
  • a gasket 7C provided between the outlet portion and the EGR valve unit 43, a gasket 7D interposed between the EGR valve unit 43 and the pipe unit 44, a pipe unit 44, and an intake manifold flange ( It consists of a gasket 7E between 46.
  • reference numerals 15 and 16 denote sealing gaskets interposed between the intake manifold and the cylinder 436a head and between the cylinder 436a head and the exhaust manifold.
  • the diameter D1 of the reflux hole 70 of the gasket 7A interposed between the reflux tube 30 and the EGR cooler unit 40 joint is defined as the inner diameter D2 of the EGR cooler unit. It is made smaller and the diameter of the recirculation holes of the other gaskets 7B, 7C, 7D, and 7E is the same size as the inner diameter of the unit, so that the reflux amount of the exhaust gas returned from the exhaust side to the intake side is maintained at an appropriate level. It was made possible.
  • the return hole diameter D3 of the gasket 7B provided between the EGR cooler unit 40 and the reflux jacket 42 is smaller than the inner diameter D4 of the joint flange 32.
  • the diameter of the recirculation holes of the other gaskets 7A, 7C, 7D, and 7E is the same size as the inner diameter of the unit, so that the reflux amount of the exhaust gas returned from the exhaust side to the intake side can be maintained at an appropriate level. It is.
  • the return hole diameter D5 of the gasket 7C interposed between the reflux jacket 42 and the EGR valve unit 43 is defined by the EGR valve unit 43. It is formed smaller than the inner diameter of the inlet portion (D6), the diameter of the reflux hole of the other gaskets (7A, 7B, 7D, 7E) is formed to the same size as the inner diameter of the unit, so the reflux amount of the exhaust gas (EGR rate) This is to maintain the proper level.
  • the return hole diameter D7 of the gasket 7C between the EGR valve unit 43 and the pipe unit is smaller than the inlet diameter D8 of the pipe unit 44.
  • the return hole diameter D9 of the gasket 7D between the pipe unit 44 and the intake manifold flange 46 is smaller than the outlet inner diameter D10 of the pipe unit 44. The reflux amount can be maintained properly.
  • the gaskets 7A, 7B, 7C, 7D, and 7E are formed in a small size compared to the inner diameter of the inlet (or outlet) of the units (or the reflux jacket) so that the exhaust gas reflux (EGR rate) can be maintained at an appropriate level.
  • the diameter ratio of the gasket reflux hole 70 to the inner diameter of the joint between the components is not limited to a specific value because it may vary depending on the operating conditions of the engine.
  • the optimum NO x reduction can be realized at this time in consideration of the engine exhaust gas temperature and flow rate within the engine rotation range. It is desirable to set such that the ratio is the diameter ratio at which continuous reflux can occur.
  • the EGR valve unit 43 is installed. That is, the EGR valve unit 43 opens the reflux path in accordance with the engine situation to allow reflux or close the flow path so that reflux does not occur.
  • the EGR valve unit 43 applied to the embodiment of the present invention may be configured to control the opening and closing of the reflux path by the engine heat source.
  • the volume change in accordance with the temperature change of the heat source is made of a configuration including a thermal expansion material, it may be a temperature-sensitive valve operated in the direction of opening or closing the reflux path in accordance with the volume change of the thermal expansion material.
  • valve rod 432 is drawn out and the exhaust gas movement passage 431 is opened in accordance with the thermal expansion of the thermal expansion material.
  • the valve rod 432 may be returned to its original position by the heat shrinkage of the thermal expansion material and the restoring force of the restoring spring 434, and the movement passage 431 may be closed.
  • the EGR valve unit 43 includes a valve body 430 in which an exhaust gas movement passage 431 is formed, and for opening and closing the exhaust gas movement passage 431 in the valve body 430. And a valve rod 432 in a linear motion.
  • a restoring spring 434 is installed between the valve body 430 and the valve rod 432, where the restoring spring 434 provides restoring force to the valve rod 432 in a direction of closing the moving passage 431. .
  • a temperature sensitive actuator 436 including a thermal expansion material is installed on the valve body 430.
  • the temperature sensitive actuator 436 is in contact with the engine heat source so as to be heat exchanged, and when the temperature of the heat source is higher than a predetermined level, the temperature sensitive actuator 436 is operated to push the valve rod 432, thereby obstructing the valve shade 433.
  • the mobile passage 431 functions to be opened.
  • the temperature-sensitive actuator 436 may include a cylinder 436a in which the thermal expansion material is accommodated, and an operation rod 436b for moving the valve rod 432 in a linear motion according to the thermal expansion or thermal contraction of the thermal expansion material W. And a heat exchange cover 438 that forms an inlet 438a through which the heat source flows in and an outlet 438b through which the heat source flows out, is provided to surround the cylinder 436a and is disposed between the heat exchange cover and the cylinder 436a. A heat exchange chamber 439 is formed.
  • a circulation pipe (not shown) is connected to each of the inlet 438a and the outlet 438b of the heat exchange cover 438, and the circulation pipe may be a cooling water circulation pipe or an engine oil circulation pipe, and the heat exchange chamber through the circulation pipe.
  • the heat source flowing into the cylinder 439 and exiting the cylinder 436a after heat exchange with the cylinder 436a may be engine coolant or engine oil.
  • the operating rod 436b when the temperature of the heat source flowing into the heat exchange chamber 439 is low because the engine is not sufficiently preheated, such as during the initial cold driving in winter, the operating rod 436b is caused to contract by the thermal expansion material in the cylinder 436a. Is maintained in the inlet state, and the exhaust gas movement passage 431 is blocked by the upward movement of the valve rod 432 by the restoring spring 434 so that reflux does not occur.
  • the exhaust gas recirculation apparatus according to the embodiment of the present invention, it is possible to achieve a high NO x reduction level that can satisfy the enhanced exhaust gas regulation without using an expensive electronic EGR valve
  • a high NO x reduction level that can satisfy the enhanced exhaust gas regulation without using an expensive electronic EGR valve
  • the mechanical structure eliminates the electronic EGR valve, there is no electrical error, so stable NO x reduction performance can be achieved continuously, and the temperature-sensitive EGR valve that controls the opening and closing of the reflux passage according to the temperature change can be obtained.
  • the application also eliminates the problem of generating soot and hydrocarbons (THC) during cold operation.
  • conduit 6 turbocharger

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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)

Abstract

La présente invention concerne un appareil de recirculation des gaz d'échappement destiné à réduire les émissions de Nox. Un appareil de recirculation des gaz d'échappement selon la présente invention comprend une partie de retour destinée à former un trajet de retour en vue d'une recirculation des gaz d'échappement à partir d'une tubulure d'échappement vers une tubulure d'admission d'un moteur. La partie de retour comprend : une chemise de retour sur un côté d'une tête de cylindre du moteur, la chemise de retour présentant une entrée communiquant avec un tube de retour de la tubulure d'échappement ; une unité de soupape RGE montée sur un côté sortie de la chemise de retour ; et une unité de conduite permettant de raccorder entre elles l'unité de soupape RGE et une bride de la tubulure d'admission. Un joint d'étanchéité comportant en son sein un orifice de retour est interposé entre chacun des éléments constituant la partie de retour, l'orifice de retour du joint d'étanchéité étant conçu de sorte à présenter un diamètre inférieur ou égal au diamètre interne d'une partie joint entre chacun des éléments au niveau desquels le joint d'étanchéité est installé. L'unité de soupape RGE est conçue sous la forme d'une soupape sensible à la température qui est actionnée par une source de chaleur en provenance du moteur de sorte à réguler le retour des gaz d'échappement à travers la partie de retour.
PCT/KR2015/009978 2014-09-23 2015-09-23 Appareil de recirculation des gaz d'échappement WO2016048018A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0126979 2014-09-23
KR1020140126979A KR102168191B1 (ko) 2014-09-23 2014-09-23 배기가스 재순환 장치

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WO2016048018A3 WO2016048018A3 (fr) 2016-06-30

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Publication number Priority date Publication date Assignee Title
JPH11270414A (ja) * 1998-03-23 1999-10-05 Nissan Diesel Motor Co Ltd Ｅｇｒガスケットの構造
JP2005248746A (ja) * 2004-03-02 2005-09-15 Kubota Corp エンジンのｅｇｒ装置
KR20060040881A (ko) * 2004-11-05 2006-05-11 현대자동차주식회사 이지알가스 누출 방지장치
JP4484800B2 (ja) * 2005-09-28 2010-06-16 株式会社クボタ エンジン
JP4605787B2 (ja) * 2006-02-09 2011-01-05 ヤンマー株式会社 Ｅｇｒ装置
KR20090132804A (ko) * 2008-06-23 2009-12-31 (주)모토닉 Ｅｇｒ 밸브 일체형 냉각장치
KR101126233B1 (ko) 2008-12-05 2012-03-19 기아자동차주식회사 Ｅｇｒ 시스템 및 그 제어방법
KR101060370B1 (ko) 2008-12-24 2011-08-29 호서대학교 산학협력단 Ｅｇｒ 장치 및 이를 포함하는 엔진시스템
KR20140012261A (ko) * 2012-07-19 2014-02-03 대동공업주식회사 Ｅｇｒ 시스템을 구비한 디젤엔진

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KR20160035405A (ko) 2016-03-31
KR102168191B1 (ko) 2020-10-20
WO2016048018A3 (fr) 2016-06-30

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