JPH0893574A - Exhaust gas recirculation device for engine with supercharger - Google Patents

Exhaust gas recirculation device for engine with supercharger

Info

Publication number
JPH0893574A
JPH0893574A JP6254153A JP25415394A JPH0893574A JP H0893574 A JPH0893574 A JP H0893574A JP 6254153 A JP6254153 A JP 6254153A JP 25415394 A JP25415394 A JP 25415394A JP H0893574 A JPH0893574 A JP H0893574A
Authority
JP
Japan
Prior art keywords
exhaust
valve
engine
opening
supercharger
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.)
Pending
Application number
JP6254153A
Other languages
Japanese (ja)
Inventor
Yuzo Aoyanagi
友三 青柳
Hiroyuki Sugihara
啓之 杉原
Akira Saito
晃 齊藤
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.)
Hino Motors Ltd
Original Assignee
Hino Motors Ltd
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 Hino Motors Ltd filed Critical Hino Motors Ltd
Priority to JP6254153A priority Critical patent/JPH0893574A/en
Publication of JPH0893574A publication Critical patent/JPH0893574A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • 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
    • F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PURPOSE: To control exhaust pressure according to a load in an engine with supercharger, and to increase and decrease the quantity of EGR gas for reducing NOx and improving fuel consumption. CONSTITUTION: The first multistage valve 11 is provided in an exhaust recirculation passage connected to the exhaust passage 5 and intake passage 8 of a supercharger 4, and the second multistage valve 12 is provided in an exhaust pipe 10 connected to an exhaust gas turbine 4a, and a controller 17 is provided to display such function as in the case of large load, the opening of the first multistage valve 11 is controlled to be small, and the opening of the second multistage valve 12 is controlled to be large, and in the case of small load, the opening of the first multistage valve 11 is controlled to be large, and the opening of the second multistage valve 12 is controlled to be small.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、過給機付エンジンの排
気ガス再循環装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation system for a supercharged engine.

【０００２】[0002]

【従来の技術】過給機が取り付けられていない自動車の
エンジンにおいては、エンジンの排気通路から排出され
る排気ガスの一部を吸気通路に戻し、ＮＯｘを低減する
排気ガス再循環（ＥＧＲ）が行われている。2. Description of the Related Art In an engine of an automobile to which a supercharger is not attached, exhaust gas recirculation (EGR) that reduces a portion of exhaust gas discharged from the engine exhaust passage to the intake passage and reduces NOx is performed. Has been done.

【０００３】[0003]

【発明が解決しようとする課題】ＮＯｘを効果的に低減
するためにはＥＧＲガス量を増すことであるが、過給機
付のエンジンにおいては、排気圧よりも吸気圧の方が高
いので排気圧を上げる必要がある。しかし、排気圧をあ
まり上げると燃費が悪化するため、負荷に応じて排気圧
を制御しなければならない。ところが、従来では過給機
付のエンジンにおいて、負荷に応じて排気圧を制御する
手段がなく、ＮＯｘを効果的に低減するためににＥＧＲ
ガス量を増量することが困難であった。In order to effectively reduce NOx, the amount of EGR gas is increased, but in an engine with a supercharger, the intake pressure is higher than the exhaust pressure, so the exhaust gas is exhausted. It is necessary to raise the atmospheric pressure. However, if the exhaust pressure is raised too much, the fuel economy deteriorates, so the exhaust pressure must be controlled according to the load. However, in a conventional engine with a supercharger, there is no means for controlling the exhaust pressure according to the load, and in order to effectively reduce NOx, EGR is performed.
It was difficult to increase the amount of gas.

【０００４】本発明の目的は、上記の問題を解消した過
給機付エンジンの排気ガス再循環装置を提供することで
ある。It is an object of the present invention to provide an exhaust gas recirculation system for a supercharged engine that solves the above problems.

【０００５】[0005]

【課題を解決するための手段】上記の目的を達成するた
めの本発明の要旨は、排気タービンと、この排気タービ
ンによって回転するコンプレッサとからなる過給機と、
エンジンの排気側と前記排気タービンとを接続した排気
通路と、前記コンプレッサとインタクーラを介してエン
ジンの吸気側とを接続した吸気通路と、前記排気通路と
前記インタクーラの下流側の吸気通路とに接続した排気
還流通路とを備え、前記排気還流通路に第１多段バルブ
を設け、前記排気タービンに接続されている排気管に第
２多段バルブを設け、負荷が大きいときには前記第１多
段バルブの開度を小さく、第２多段バルブの開度を大き
く制御し、負荷が小さいときには前記第１多段バルブの
開度を大きく、第２多段バルブの開度を小さく制御する
コントローラを備えたものである。The gist of the present invention for achieving the above object is to provide a supercharger comprising an exhaust turbine and a compressor rotated by the exhaust turbine,
An exhaust passage connecting the exhaust side of the engine and the exhaust turbine, an intake passage connecting the intake side of the engine via the compressor and an intercooler, and an exhaust passage and an intake passage downstream of the intercooler An exhaust gas recirculation passage, a first multistage valve is provided in the exhaust gas recirculation passage, and a second multistage valve is provided in an exhaust pipe connected to the exhaust turbine. When the load is large, the opening degree of the first multistage valve And a controller for controlling the opening degree of the second multi-stage valve to be large and for controlling the opening degree of the first multi-stage valve to be large and the opening degree of the second multi-stage valve to be small when the load is small.

【０００６】[0006]

【作用】上記の構成により、負荷の大小に応じて排気還
流通路の第１多段バルブと排気タービン排気管の第２多
段バルブを連動して、その開度を相対的に制御し、ＮＯ
ｘを効果的に低減する必要がある負荷の小さい時に、排
気圧を上げてＥＧＲガス量を増量させ、負荷の大きい時
には排気圧を下げ、ＥＧＲガス量を減量して燃費の向上
を可能にした。With the above structure, the first multi-stage valve in the exhaust gas recirculation passage and the second multi-stage valve in the exhaust turbine exhaust pipe are interlocked with each other according to the magnitude of the load to relatively control the opening of the exhaust turbine exhaust pipe.
When the load required to effectively reduce x is small, the exhaust pressure is increased to increase the EGR gas amount, and when the load is large, the exhaust pressure is reduced, and the EGR gas amount is decreased to improve fuel efficiency. .

【０００７】[0007]

【実施例】以下本発明の実施例を図面に基づいて説明す
る。図１において、１はエンジン、２は前記エンジン１
の吸気側のインテークマニホールド、３は前記エンジン
１の排気側のエキゾーストマニホールドである。Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is an engine, 2 is the engine 1
The intake manifold 3 on the intake side is an exhaust manifold on the exhaust side of the engine 1.

【０００８】４は過給機であり、排気タービン４ａと、
この排気タービン４ａによって回転するコンプレッサ４
ｂとから構成されている。前記過給機４の排気タービン
４ａに前記エキゾーストマニホールド３と排気通路５を
介して接続されている。Reference numeral 4 denotes a supercharger, which includes an exhaust turbine 4a,
Compressor 4 rotated by this exhaust turbine 4a
b and. The exhaust turbine 4 a of the supercharger 4 is connected to the exhaust manifold 3 via an exhaust passage 5.

【０００９】前記過給機４のコンプレッサ４ｂは吸気通
路７を介してインタクーラ６の上流側に接続されてい
る。また、前記インタクーラ６の下流側とエンジン１の
インテークマニホールド２とを吸気通路８によって接続
している。The compressor 4b of the supercharger 4 is connected to the upstream side of the intercooler 6 via the intake passage 7. An intake passage 8 connects the downstream side of the intercooler 6 and the intake manifold 2 of the engine 1.

【００１０】前記排気通路５と前記インタクーラ６の下
流側の吸気通路８とに排気還流通路９が接続されてい
る。An exhaust gas recirculation passage 9 is connected to the exhaust passage 5 and an intake passage 8 on the downstream side of the intercooler 6.

【００１１】前記排気還流通路９には第１多段バルブ１
１が設けられ、前記排気タービン４ａに接続されている
排気管１０には第２多段バルブ１２が設けられている。A first multistage valve 1 is provided in the exhaust gas recirculation passage 9.
1 is provided, and a second multistage valve 12 is provided in the exhaust pipe 10 connected to the exhaust turbine 4a.

【００１２】さらに、負荷が大きいときには前記第１多
段バルブ１１の開度を小さく、第２多段バルブ１２の開
度を大きく制御し、負荷が小さいときには前記第１多段
バルブ１１の開度を大きく、第２多段バルブ１２の開度
を小さく制御するコントローラ１７を備えている。この
コントローラ１７はエンジン回転数信号１４，エンジン
負荷信号１５及びエンジン水温信号１６を入力して前記
第１多段バルブ１１及び第２多段バルブ１２を連動して
制御するものである。Further, when the load is large, the opening degree of the first multistage valve 11 is made small, and the opening degree of the second multistage valve 12 is controlled to be large, and when the load is small, the opening degree of the first multistage valve 11 is made large, A controller 17 for controlling the opening degree of the second multistage valve 12 to be small is provided. The controller 17 inputs an engine speed signal 14, an engine load signal 15 and an engine water temperature signal 16 to control the first multistage valve 11 and the second multistage valve 12 in an interlocking manner.

【００１３】前記第１多段バルブ１１及び第２多段バル
ブ１２の構成は、例えば図３で示す構造のものが用いら
れる。すなわち、ケーシング４１の内部に一端が開口部
にストッパ５５を有する円筒状の第２ピストン４２を摺
動自在に設け、この第２ピストン４２の内部に第１ピス
トン４３を設け、第１ピストン４３と第２ピストン４２
との間、第２ピストン４２の反第１ピストン４３側、第
１ピストン４３の反第２ピストン４２側にそれぞれエア
室４７，４８，４９を有するシリンダ５０を形成する。The structures of the first multistage valve 11 and the second multistage valve 12 are, for example, those shown in FIG. That is, the cylindrical second piston 42 having the stopper 55 at the opening at one end is slidably provided inside the casing 41, and the first piston 43 is provided inside the second piston 42. Second piston 42
In between, a cylinder 50 having air chambers 47, 48, 49 is formed on the side opposite to the first piston 43 of the second piston 42 and on the side opposite to the second piston 42 of the first piston 43, respectively.

【００１４】このシリンダ５０の第１ピストン４３に反
第２ピストン４２側へ延びて先端がケーシング４１を貫
通するロッド５１の後端を接続し、前記エア室４９のケ
ーシング４１と第１ピストン４３との間に第１ピストン
４３を第２ピストン４２側へ付勢するスプリング５２を
介装し、かつ、第２ピストン４２他端開口部の前記エア
室４７側の面に第１ピストン４３を押す突起５７を形成
する。The first piston 43 of the cylinder 50 is connected to the rear end of a rod 51 extending to the side opposite to the second piston 42 and having a tip penetrating the casing 41, and the casing 41 of the air chamber 49 and the first piston 43 are connected to each other. A spring 52 for urging the first piston 43 toward the second piston 42 side is interposed between the two, and a projection for pushing the first piston 43 on the surface of the second piston 42 other end opening portion on the air chamber 47 side. 57 is formed.

【００１５】また、前記シリンダ５０の各エア室４７，
４８，４９とケーシング４１外部に連通するポート４
４，４５，４６を形成する。５６は第２ピストン４２に
設けたポート４４とエア室４７とを連通するエア通路で
あるFurther, each air chamber 47 of the cylinder 50,
Port 4 communicating with 48, 49 and the outside of casing 41
4, 45, 46 are formed. Reference numeral 56 is an air passage that connects the port 44 provided in the second piston 42 and the air chamber 47.

【００１６】前記排気タービン４ａに接続されている排
気管１０に形成した弁座５３に当接する弁体５４を設
け、前記シリンダ５０のロッド先端を弁体５４に接続
し、弁体５４をシリンダ５０により弁座５３に対し、コ
ントローラ１７で図略の電磁弁を制御してポート４４，
４５にエア６１，６２を供給して第１ピストン４３及び
第２ピストン４２の一体ストローク及びそれぞれのスト
ロークに基づいて段階的に開度が制御される構造であ
る。A valve body 54 that abuts a valve seat 53 formed in the exhaust pipe 10 connected to the exhaust turbine 4a is provided, the rod end of the cylinder 50 is connected to the valve body 54, and the valve body 54 is connected to the cylinder 50. To the valve seat 53, the controller 17 controls a solenoid valve (not shown) to control the port 44,
The air 61, 62 is supplied to 45, and the opening is controlled stepwise based on the integral stroke of the first piston 43 and the second piston 42 and the respective strokes.

【００１７】本発明は上記の通りの構造であるから、コ
ントローラ１７によって負荷の大小に応じて排気還流通
路９の第１多段バルブ１１と排気タービン４ａの排気管
１０の第２多段バルブ１２を連動して、その開度を相対
的に制御する。すなわち、負荷が大きいときには前記第
１多段バルブ１１の開度を小さく、第２多段バルブ１２
の開度を大きく制御し、負荷が小さいときには前記第１
多段バルブ１１の開度を大きく、第２多段バルブ１２の
開度を小さく制御する。Since the present invention has the above-described structure, the controller 17 causes the first multistage valve 11 of the exhaust gas recirculation passage 9 and the second multistage valve 12 of the exhaust pipe 10 of the exhaust turbine 4a to be interlocked with each other according to the magnitude of the load. Then, the opening is relatively controlled. That is, when the load is large, the opening degree of the first multistage valve 11 is small and the second multistage valve 12 is small.
The opening degree of the
The opening degree of the multistage valve 11 is controlled to be large and the opening degree of the second multistage valve 12 is controlled to be small.

【００１８】これにより、ＮＯｘを効果的に低減する必
要がある負荷の小さい時に、排気圧を上げてＥＧＲガス
量を増量させ、負荷の大きい時には排気圧を下げ、ＥＧ
Ｒガス量を減量することができる。As a result, when the load required to effectively reduce NOx is small, the exhaust pressure is increased to increase the EGR gas amount, and when the load is large, the exhaust pressure is lowered to reduce the EG.
The amount of R gas can be reduced.

【００１９】因みに、ＥＧＲなしの場合では図２のＡ線
のようにＮＯｘ濃度が高く、通常のＥＧＲでは図２のＢ
線のようにＮＯｘ濃度が下がるが、本発明のように第１
多段バルブ１１と第２多段バルブ１２を連動したもので
は図２のＣ線のようにＮＯｘ濃度が著しく下がる。Incidentally, in the case without EGR, the NOx concentration is high as shown by line A in FIG.
The NOx concentration decreases like the line, but the first
In the case where the multistage valve 11 and the second multistage valve 12 are interlocked with each other, the NOx concentration is remarkably lowered as shown by the line C in FIG.

【００２０】第１多段バルブ１１及び第２多段バルブ１
２は図３で例示するように、その開度が段階的に制御さ
れるため、中負荷においては、第１多段バルブ１１の開
度を小から中に制御し、第２多段バルブ１２の開度を大
から中に制御して負荷に応じた排気圧とＥＧＲガス量を
制御する。First multistage valve 11 and second multistage valve 1
As illustrated in FIG. 3, the opening degree of No. 2 is controlled stepwise, so that the opening degree of the first multi-stage valve 11 is controlled from small to medium and the opening degree of the second multi-stage valve 12 is controlled at medium load. The exhaust pressure and the EGR gas amount according to the load are controlled by controlling the degree from high to medium.

【００２１】[0021]

【発明の効果】以上のように本発明は、過給機付のエン
ジンにおいて、負荷に応じて排気圧を制御し、ＥＧＲガ
ス量を増減させることができ、ＮＯｘの低減と燃費の向
上が図られる効果を有している。As described above, according to the present invention, in an engine with a supercharger, it is possible to control the exhaust pressure according to the load and increase or decrease the EGR gas amount, thereby reducing NOx and improving fuel consumption. Has the effect of being.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明装置の系統図FIG. 1 is a system diagram of the device of the present invention.

【図２】本発明装置と従来装置とによるＮＯｘ濃度比較
グラフFIG. 2 is a graph comparing NOx concentration between the device of the present invention and the conventional device.

【図３】多段バルブの一例を示す断面図FIG. 3 is a sectional view showing an example of a multi-stage valve.

【符号の説明】[Explanation of symbols]

１ エンジン ２ インテークマニホールド ３ エキゾーストマニホールド ４ 過給機 ４ａ 排気タービン ４ｂ コンプレッサ ５ 排気通路 ６ インタクーラ ７ 吸気通路 ８ 吸気通路 ９ 排気還流通路 １０ 吸気管 １１ 第１多段バルブ １２ 第２多段バルブ １７ コントローラ 1 engine 2 intake manifold 3 exhaust manifold 4 supercharger 4a exhaust turbine 4b compressor 5 exhaust passage 6 intercooler 7 intake passage 8 intake passage 9 exhaust recirculation passage 10 intake pipe 11 first multistage valve 12 second multistage valve 17 controller

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｂ 37/00 ３０２ Ｆ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location F02B 37/00 302 F

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 排気タービンと、この排気タービンによ
って回転するコンプレッサとからなる過給機と、エンジ
ンの排気側と前記排気タービンとを接続した排気通路
と、前記コンプレッサとインタクーラを介してエンジン
の吸気側とを接続した吸気通路と、前記排気通路と前記
インタクーラの下流側の吸気通路とに接続した排気還流
通路とを備え、前記排気還流通路に第１多段バルブを設
け、前記排気タービンに接続されている排気管に第２多
段バルブを設け、負荷が大きいときには前記第１多段バ
ルブの開度を小さく、第２多段バルブの開度を大きく制
御し、負荷が小さいときには前記第１多段バルブの開度
を大きく、第２多段バルブの開度を小さく制御するコン
トローラを備えたことを特徴とする過給機付エンジンの
排気ガス再循環装置。1. A supercharger comprising an exhaust turbine and a compressor rotated by the exhaust turbine, an exhaust passage connecting an exhaust side of the engine and the exhaust turbine, and an intake air of the engine via the compressor and an intercooler. And an exhaust gas recirculation passage connected to the exhaust passage and an intake passage downstream of the intercooler. The exhaust recirculation passage is provided with a first multistage valve and is connected to the exhaust turbine. A second multi-stage valve is provided in the exhaust pipe, and the opening of the first multi-stage valve is controlled to be small when the load is large, and the opening of the second multi-stage valve is controlled to be large. When the load is small, the opening of the first multi-stage valve is performed. An exhaust gas recirculation device for an engine with a supercharger, which is equipped with a controller for controlling the degree of opening of the second multistage valve to be small and the opening degree of the second multistage valve to be small.
JP6254153A 1994-09-26 1994-09-26 Exhaust gas recirculation device for engine with supercharger Pending JPH0893574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6254153A JPH0893574A (en) 1994-09-26 1994-09-26 Exhaust gas recirculation device for engine with supercharger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6254153A JPH0893574A (en) 1994-09-26 1994-09-26 Exhaust gas recirculation device for engine with supercharger

Publications (1)

Publication Number Publication Date
JPH0893574A true JPH0893574A (en) 1996-04-09

Family

ID=17260968

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6254153A Pending JPH0893574A (en) 1994-09-26 1994-09-26 Exhaust gas recirculation device for engine with supercharger

Country Status (1)

Country Link
JP (1) JPH0893574A (en)

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