JP2522482Y2 - Exhaust gas recirculation structure of internal combustion engine with two-stage supercharger - Google Patents
Exhaust gas recirculation structure of internal combustion engine with two-stage superchargerInfo
- Publication number
- JP2522482Y2 JP2522482Y2 JP835092U JP835092U JP2522482Y2 JP 2522482 Y2 JP2522482 Y2 JP 2522482Y2 JP 835092 U JP835092 U JP 835092U JP 835092 U JP835092 U JP 835092U JP 2522482 Y2 JP2522482 Y2 JP 2522482Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- stage
- exhaust
- pressure
- internal combustion
- 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.)
- Expired - Fee Related
Links
Landscapes
- Supercharger (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Description
【0001】[0001]
【産業上の利用分野】本考案は、二段過給機を有する内
燃機関における排気ガスの再循環構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation structure for an internal combustion engine having a two-stage supercharger.
【0002】[0002]
【従来の技術】従来から内燃機関において、排気ガス中
の窒素酸化物等の有害物を低減するために、排気ガスを
再循環させて吸気中に還流し、エンジン内の燃焼を抑制
して窒素酸化物等の抑制を図る技術は、公知とされてい
るのである。即ち、エンジンの排気中に含まれる有害物
質、殊に、窒素酸化物を低減させる手段として、排気の
一部を吸気中に還流させるのである。この排気の吸気中
への還流は、吸気中に還流された排気がエンジンの燃焼
室内の燃焼を抑制し、その最高温度を下げて、窒素酸化
物の生成を低減するのである。しかし昨今では、環境問
題が大きく採り上げられ、より一層の排気ガス中の窒素
酸化物等の有害物質の除去が望まれるため、排気ガスの
再循環量、即ち、EGR量をより多量にする技術が必要
となってきたのである。2. Description of the Related Art Conventionally, in an internal combustion engine, in order to reduce harmful substances such as nitrogen oxides in the exhaust gas, the exhaust gas is recirculated and returned to the intake air to suppress the combustion in the engine. Techniques for suppressing oxides and the like are known. That is, a part of the exhaust gas is recirculated into the intake air as a means for reducing harmful substances, particularly nitrogen oxides, contained in the exhaust gas of the engine. The recirculation of the exhaust gas into the intake air suppresses the combustion in the combustion chamber of the engine, and reduces the maximum temperature of the exhaust gas, thereby reducing the generation of nitrogen oxides. However, in recent years, environmental issues have been taken up greatly, and it is desired to further remove harmful substances such as nitrogen oxides in exhaust gas. Therefore, a technology for increasing the amount of exhaust gas recirculation, that is, the EGR amount, has been developed. It has become necessary.
【0003】これに応える技術として、従来は、図2に
示す如き方法が用いられていた。即ち、エンジンEは二
段過給機式となっており、吸気は、吸気管1aより低圧
段(一段目)過給機の低圧段コンプレッサーC1、吸気
管1b、高圧段(二段目)過給機の高圧段コンプレッサ
ーC2、さらに吸気管1cを経て、エンジンE内の燃焼
室に至るものである。なお、7は吸気冷却用のインター
クーラーである。エンジンEは多気筒型であり(本図案
では6気筒型)、1〜3気筒の排気及び4〜6気筒の排
気は、高圧段(2段目)タービンT2の入口までの排気
管2a内においては中隔壁3によって仕切られて該高圧
段タービンT2に案内される。1〜3気筒及び4〜6気
筒の両側の排気が混じり合うと、乱気流を発生し、高圧
段タービンT2の効率が低下するので、中隔壁3を設け
ているのである。排気は、さらに排気管2b、低圧段
(1段目)タービンT1を経て、排気管2cより排出さ
れるものである。As a technique for responding to this, conventionally, a method as shown in FIG. 2 has been used. That is, the engine E is of a two-stage supercharger type, and the intake air is supplied from the low-pressure stage (first stage) supercharger C1, the intake tube 1b, and the high-pressure stage (second stage) of the supercharger of the intake pipe 1a. The gas reaches the combustion chamber in the engine E via the high-pressure compressor C2 of the feeder and the intake pipe 1c. Reference numeral 7 denotes an intercooler for cooling the intake air. The engine E is a multi-cylinder type (six-cylinder type in the present design), and exhausts of the first to third cylinders and exhausts of the fourth to sixth cylinders are exhausted in an exhaust pipe 2a to an inlet of a high-pressure stage (second stage) turbine T2. Are partitioned by the partition wall 3 and guided to the high-pressure stage turbine T2. When the exhaust gas on both sides of the first to third cylinders and the fourth to sixth cylinders is mixed, turbulence is generated, and the efficiency of the high-pressure stage turbine T2 is reduced. Therefore, the inner partition wall 3 is provided. The exhaust gas is further discharged from the exhaust pipe 2c through the exhaust pipe 2b and the low-pressure stage (first stage) turbine T1.
【0004】そこで、従来の図1の如き構成におけるE
GR技術は、低圧段タービンT1及び高圧段タービンT
2の両タービンからの排気を排出する排気管2cより、
低圧段(一段目)コンプレッサー入口側の吸気管1aに
再循環路R’を設けるものである。該再循環路R’に
は、EGR量調節バルブV1を設け、排気ガス中の黒煙
等除去用のフィルター4、冷却器5、及び気水分離器6
が配設されている。該再循環路の構成は、実開昭58─
183954にて公知である。さらに、該排気管2cよ
り再循環路R’に背圧をかけるための排気出口バルブV
2を設けているのである。[0004] Therefore, E in the conventional configuration as shown in FIG.
The GR technology includes a low-pressure stage turbine T1 and a high-pressure stage turbine T
2 from an exhaust pipe 2c that discharges exhaust gas from both turbines.
A recirculation path R 'is provided in the intake pipe 1a on the low pressure stage (first stage) compressor inlet side. The recirculation path R ′ is provided with an EGR amount control valve V 1, a filter 4 for removing black smoke and the like in the exhaust gas, a cooler 5, and a steam separator 6.
Are arranged. The construction of the recirculation path is
183954. Further, an exhaust outlet valve V for applying back pressure from the exhaust pipe 2c to the recirculation path R '.
2 is provided.
【0005】また、図2の如く、低圧段タービンからの
排気管から再循環路を設ける方法以外に、高圧側より低
圧側への排気の流れを利用して、該背圧をかけるバルブ
を不要とするために、実開平3─122259の如く、
高圧段タービン入口から排気の一部を抜き取る方法もあ
る。In addition to the method of providing a recirculation path from an exhaust pipe from a low pressure stage turbine as shown in FIG. 2, a valve for applying the back pressure by utilizing the flow of exhaust gas from a high pressure side to a low pressure side is unnecessary. In order to make
There is also a method of extracting a part of exhaust gas from the high pressure stage turbine inlet.
【0006】[0006]
【考案が解決しようとする課題】図2の如き構成の排気
ガス再循環において問題となるのは、EGR量調整バル
ブV1以外に排気出口バルブV2が必要であり、二つの
バルブ制御を行わなくてはならず、複雑な構造となって
いたのである。また、低公害化の要請から、該排気出口
バルブV2による背圧は相当高いものとしなければなら
ず、その背圧による排気抵抗で、エンジン性能の悪化を
ももたらしてしまうのである。The problem with the exhaust gas recirculation having the configuration shown in FIG. 2 is that an exhaust outlet valve V2 is required in addition to the EGR amount adjustment valve V1, and two valve controls are not performed. Instead, it had a complicated structure. In addition, due to the demand for low pollution, the back pressure by the exhaust outlet valve V2 must be considerably high, and the exhaust resistance due to the back pressure also causes deterioration of engine performance.
【0007】また、高圧段タービン入口より排気の一部
を抜き取る方法は、図2の如く、多気筒型エンジンにお
いては、エンジンから高圧段タービンまでの排気管中に
構成している中隔壁3を一部削除しなければならず、そ
のため1〜3気筒側と4〜6気筒側の両排気が混じり合
って圧力バランスを崩し、該高圧段タービンの性能を劣
化させるのである。As shown in FIG. 2, a method of extracting a part of the exhaust gas from the inlet of the high-pressure stage turbine is as follows. Part of the exhaust has to be deleted, and therefore, the exhausts of the first to third cylinders and the fourth to sixth cylinders are mixed, and the pressure balance is lost, thereby deteriorating the performance of the high-pressure stage turbine.
【0008】本考案は、図2図示の複雑なEGR制御を
要する構造を改善して、EGR量調整バルブV1のみに
よる容易なEGR制御を行える如く再循環路を構成する
ものである。The present invention improves the structure requiring complicated EGR control shown in FIG. 2 and configures a recirculation path so that the EGR control can be easily performed only by the EGR amount adjustment valve V1.
【0009】[0009]
【課題を解決するための手段】二段過給機を有する内燃
機関において、排気タービンの一段目過給機と二段目過
給機の間の排出ガスの一部を一段目コンプレッサーの吸
気口に再循環させる如く再循環路を構成するものであ
る。SUMMARY OF THE INVENTION In an internal combustion engine having a second-stage supercharger, part of exhaust gas between the first-stage supercharger and the second-stage supercharger of an exhaust turbine is supplied to an intake port of a first-stage compressor. A recirculation path is configured to recirculate the water.
【0010】[0010]
【実施例】本考案の解決すべき課題及び構成は以上の如
くであり、次に添付の図面に示した本考案の実施例を説
明する。図1は本考案の2段過給器付エンジンEにおけ
る排気ガス再循環の構造を示すシステム図、図2は従来
の2段過給器付エンジンEの排気ガス再循環構造を示す
システム図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 1 is a system diagram showing an exhaust gas recirculation structure in an engine E with a two-stage supercharger of the present invention, and FIG. 2 is a system diagram showing an exhaust gas recirculation structure of a conventional engine E with a two-stage supercharger. is there.
【0011】図1の排気ガス再循環構造について説明す
る。本考案においては、高圧段(2段目)タービンT2
より低圧段(1段目)タービンT1までの排気管2bか
ら、低圧段(1段目)コンプレッサーC1の吸気口側の
吸気管1aに至る再循環路Rを構成するものである。該
低圧段コンプレッサーC1により、新規の吸気を混合さ
れた上で、圧力を掛けた後に、インタークーラー7を通
過して、高圧段コンプレッサーC2に入り、更に加圧さ
れた状態で燃焼室に送りこまれるのである。そして該再
循環路RにEGR量調整バルブV1を介装している。そ
してEGR量調整バルブV1を介装した再循環路Rに
は、フィルター4と冷却器5と気水分離器6が介装され
ている。該フィルター4は排気ガス中の煤や塵埃を取り
去るものであり、また冷却器5は高温排気ガスを冷却す
るものである。また該高温排気ガスの冷却により、水蒸
気分が水滴に変わるので気水分離器6によりこの水滴を
分離すべく構成している。The exhaust gas recirculation structure shown in FIG. 1 will be described. In the present invention, the high-pressure stage (second stage) turbine T2
It constitutes a recirculation path R from the exhaust pipe 2b up to the lower pressure stage (first stage) turbine T1 to the intake pipe 1a on the intake port side of the low pressure stage (first stage) compressor C1. After the new intake air is mixed by the low-pressure stage compressor C1, after applying pressure, it passes through the intercooler 7, enters the high-pressure stage compressor C2, and is sent to the combustion chamber in a further pressurized state. is there. An EGR amount adjustment valve V1 is interposed in the recirculation path R. A filter 4, a cooler 5, and a water / water separator 6 are provided in the recirculation path R provided with the EGR amount adjustment valve V1. The filter 4 removes soot and dust in the exhaust gas, and the cooler 5 cools the high-temperature exhaust gas. The cooling of the high-temperature exhaust gas changes the water vapor into water droplets, so that the water / water separator 6 is configured to separate the water droplets.
【0012】排気管2bにおいては、高圧段タービンT
2より低圧段タービンT1の間で、自然に排気に圧力が
掛かっているので、図2の従来技術の如き背圧をかける
バルブ(排気出口バルブV2)が必要なく、多量の排気
を再循環路Rに送り込む事ができ、制御面でもEGR量
調整バルブV1の制御のみで済むのである。また、高圧
段タービンの入口側より排気を取り入れる場合のよう
に、排気管2a中の中隔壁3を削除する必要もないので
ある。排気管2a中の中隔壁3を取り除く場合には、1
〜3気筒側と4〜6気筒側の両排気が混じり合って圧力
バランスを崩し、該高圧段タービンの性能を劣化させる
という不具合が発生するのであるが、この点を不具合を
解消することが出来るのである。しかも高圧段タービン
の入口側より排気を取り入れる場合に比べて本考案の方
が排気温度が低いため冷却器5の容量を小さくすること
ができる。なお、再循環路Rの途中の構成は、従来の如
く、フィルター4、冷却器5、及び気水分離器6を配設
するものである。また、EGR量調整バルブV1は、電
磁バルブ等により構成される事が考えられるものであ
る。In the exhaust pipe 2b, a high-pressure stage turbine T
Since the pressure is naturally applied to the exhaust gas between the low pressure stage turbine T1 and T2, a valve (exhaust outlet valve V2) for applying a back pressure as in the prior art of FIG. Therefore, only the control of the EGR amount adjustment valve V1 is required in terms of control. Further, unlike the case where exhaust gas is taken in from the inlet side of the high-pressure stage turbine, there is no need to delete the inner partition wall 3 in the exhaust pipe 2a. When removing the inner partition wall 3 in the exhaust pipe 2a, 1
The exhaust of the three to four cylinders and the exhaust of the four to six cylinders are mixed, and the pressure balance is disturbed, and the performance of the high-pressure stage turbine is deteriorated. This problem can be solved. It is. In addition, since the exhaust temperature is lower in the present invention than in the case where exhaust gas is taken in from the inlet side of the high-pressure stage turbine, the capacity of the cooler 5 can be reduced. The configuration in the middle of the recirculation path R is such that the filter 4, the cooler 5, and the steam separator 6 are disposed as in the related art. Further, the EGR amount adjustment valve V1 may be constituted by an electromagnetic valve or the like.
【0013】[0013]
【考案の効果】本考案は、以上のように構成する事によ
り、次のような効果を奏するものである。即ち、排気タ
ービンの一段目と二段目の間の排出ガスの一部を一段目
コンプレッサーの吸気口に再循環させる如くに再循環路
を構成した事により、背圧をかけることなく高圧の排気
を再循環路に送り込む事ができるので、多量のEGRを
送り込む事が可能である。[Effects of the Invention] The present invention has the following effects by being configured as described above. In other words, by forming a recirculation path so as to recirculate part of the exhaust gas between the first and second stages of the exhaust turbine to the intake port of the first stage compressor, high-pressure exhaust without applying back pressure Can be sent to the recirculation path, so that a large amount of EGR can be sent.
【0014】第2に、エンジン負荷の高低や回転数に応
じたEGR量の設定も、EGR量調整バルブV1の一個
により制御する事ができるのである。また、高圧段ター
ビン入口側より排気ガスを抜く方法のように、排気圧の
バランスを崩してタービン性能を劣化させる恐れもない
のである。Second, the setting of the EGR amount according to the level of the engine load and the number of revolutions can be controlled by one EGR amount adjusting valve V1. Further, unlike the method of extracting exhaust gas from the inlet side of the high-pressure stage turbine, there is no possibility that the balance of the exhaust pressure is lost and the turbine performance is deteriorated.
【図1】本考案の2段過給器付エンジンEにおける排気
ガス再循環の構造を示すシステム図である。FIG. 1 is a system diagram showing a structure of exhaust gas recirculation in an engine E with a two-stage supercharger of the present invention.
【図2】従来の2段過給器付エンジンEにおける排気ガ
ス再循環構造を示すシステム図である。FIG. 2 is a system diagram showing an exhaust gas recirculation structure in a conventional engine E with a two-stage supercharger.
E エンジン R 排気ガス再循環路 V1 EGR量調整バルブ C1 低圧段コンプレッサー C2 高圧段コンプレッサー T1 低圧段タービン T2 高圧段タービン 1a,1b,1c 吸気管 2a,2b,2c 排気管 3 中隔壁 E engine R exhaust gas recirculation path V1 EGR amount adjustment valve C1 low-pressure stage compressor C2 high-pressure stage compressor T1 low-pressure stage turbine T2 high-pressure stage turbine 1a, 1b, 1c Intake pipes 2a, 2b, 2c Exhaust pipe 3 Middle partition
Claims (1)
排気タービンの一段目過給機と二段目過給機の間の排気
ガスの一部を、一段目コンプレッサーの吸気口に再循環
させる事を特徴とする二段過給機付内燃機関の排気ガス
再循環構造。1. An internal combustion engine having a two-stage supercharger,
Exhaust of an internal combustion engine with a two-stage supercharger, characterized in that part of the exhaust gas between the first-stage supercharger and the second-stage supercharger of the exhaust turbine is recirculated to the intake port of the first-stage compressor. Gas recirculation structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP835092U JP2522482Y2 (en) | 1992-02-25 | 1992-02-25 | Exhaust gas recirculation structure of internal combustion engine with two-stage supercharger |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP835092U JP2522482Y2 (en) | 1992-02-25 | 1992-02-25 | Exhaust gas recirculation structure of internal combustion engine with two-stage supercharger |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0569364U JPH0569364U (en) | 1993-09-21 |
JP2522482Y2 true JP2522482Y2 (en) | 1997-01-16 |
Family
ID=11690779
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP835092U Expired - Fee Related JP2522482Y2 (en) | 1992-02-25 | 1992-02-25 | Exhaust gas recirculation structure of internal combustion engine with two-stage supercharger |
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JP (1) | JP2522482Y2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004009794A1 (en) * | 2004-02-28 | 2005-09-22 | Daimlerchrysler Ag | Internal combustion engine with two exhaust gas turbochargers |
JP4616707B2 (en) * | 2005-06-14 | 2011-01-19 | 日野自動車株式会社 | Exhaust gas recirculation structure for turbocharged engines |
DE102007052899A1 (en) * | 2007-11-07 | 2009-05-14 | Ford Global Technologies, LLC, Dearborn | Charged internal combustion engine and method for operating such an internal combustion engine |
KR101628548B1 (en) * | 2014-12-01 | 2016-06-09 | 현대자동차주식회사 | Apparatus of Two-stage turbo charger |
-
1992
- 1992-02-25 JP JP835092U patent/JP2522482Y2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JPH0569364U (en) | 1993-09-21 |
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