JPH1162715A - Egr device for super charge type engine - Google Patents
Egr device for super charge type engineInfo
- Publication number
- JPH1162715A JPH1162715A JP9225113A JP22511397A JPH1162715A JP H1162715 A JPH1162715 A JP H1162715A JP 9225113 A JP9225113 A JP 9225113A JP 22511397 A JP22511397 A JP 22511397A JP H1162715 A JPH1162715 A JP H1162715A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- passage
- engine
- intake
- exhaust
- 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.)
- Granted
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
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/07—Mixed pressure loops, i.e. wherein recirculated exhaust gas is either taken out upstream of the turbine and reintroduced upstream of the compressor, or is taken out downstream of the turbine and reintroduced 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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/34—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with compressors, turbines or the like in the recirculation passage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0406—Layout of the intake air cooling or coolant circuit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
-
- 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
- F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、過給機付きディー
ゼルエンジンなどにおいて、ＮＯｘの排出量を低減する
ために、排気ガスの一部を吸気側に還流する過給式エン
ジンのＥＧＲ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 EGR device for a supercharged engine in which a part of exhaust gas is recirculated to an intake side in order to reduce a NOx emission in a turbocharged diesel engine or the like. It is.
【０００２】[0002]
【従来の技術】ディーゼルエンジン等の排気ガス対策に
おいて、排気ガス中のＮＯｘの排出量を低減するため
に、不活性ガスである排気ガスの一部を吸気側に還流す
ることによって、燃焼温度を低く抑えて、ＮＯｘの生成
を抑制するＥＧＲ（排気再循環）が有効であることが知
られており、広く実用化されている。2. Description of the Related Art In exhaust gas countermeasures for diesel engines and the like, in order to reduce the amount of NOx emitted from exhaust gas, the combustion temperature is reduced by recirculating a part of the exhaust gas, which is an inert gas, to the intake side. It is known that EGR (exhaust gas recirculation), which suppresses NOx generation while keeping it low, is effective and widely used.
【０００３】このＥＧＲ装置は過給式エンジンにも適用
され、図５に示すように排気マニホールド12ａから排気
ガスＧを取り出し、ＥＧＲクーラー７を配設したＥＧＲ
通路９を経由して、吸気通路11の新気Ａに混入して吸気
マニホールド11ａへ還流させてＥＧＲを行っている。し
かし、過給式エンジンにおいては、エンジン負荷の上昇
に伴い、吸気圧（ブート圧）が高くなり、排気圧より高
圧になってくるので、ＥＧＲガスＧを吸気通路11へ還流
させることができなくなる。This EGR device is also applied to a supercharged engine, and as shown in FIG. 5, an exhaust gas G is taken out from an exhaust manifold 12a, and an EGR device provided with an EGR cooler 7 is provided.
The EGR is performed by mixing the fresh air A in the intake passage 11 through the passage 9 and returning the mixture to the intake manifold 11a. However, in the supercharged engine, as the engine load increases, the intake pressure (boot pressure) increases and becomes higher than the exhaust pressure, so that the EGR gas G cannot be recirculated to the intake passage 11. .
【０００４】そのため、排気通路12に通じるウェイスト
ゲート12ｂを開いて排気圧力を下げ、それによってター
ビン２の回転数を低下させることにより吸気圧力を低減
して、ＥＧＲガスＧを吸気通路11に還流させる方法があ
る。しかし、この方法を取ると新気Ａの量が減少し、ス
モークの増大を引き起こすので、ＥＧＲできる領域Ｅ
は、図４（ａ）に示すように、低負荷でかつ中回転以下
のエンジンの運転領域に限られてしまうという問題があ
る。Therefore, the exhaust pressure is reduced by opening the waste gate 12 b communicating with the exhaust passage 12, thereby reducing the rotational speed of the turbine 2, thereby reducing the intake pressure and returning the EGR gas G to the intake passage 11. There is a way. However, this method reduces the amount of fresh air A and causes an increase in smoke.
However, as shown in FIG. 4 (a), there is a problem that the engine is limited to an operation region of an engine with a low load and a middle rotation or lower.
【０００５】また、タービン２の入口の断面積を可変に
した可変容量型ターボチャージャ（ＶＧターボ）では、
入口の断面積をコントロールすることでタービン回転数
を変化させて、排気圧と吸気圧を制御してＥＧＲ可能な
領域を拡大している。この場合においては、図４（ｂ）
に示すような中負荷のＥで示すエンジン運転領域までＥ
ＧＲ可能となるが、更にＮＯｘを低減して排気ガスを浄
化するために、エンジンの高負荷運転領域でもＥＧＲ可
能にしたいという要求がある。In a variable capacity turbocharger (VG turbo) in which the cross-sectional area of the inlet of the turbine 2 is variable,
By controlling the cross-sectional area of the inlet and changing the turbine speed, the exhaust pressure and the intake pressure are controlled to expand the EGR-capable region. In this case, FIG.
Up to the engine operating range indicated by E with medium load as shown in
Although GR becomes possible, there is a demand for enabling EGR even in a high-load operation region of the engine in order to further reduce NOx and purify exhaust gas.
【０００６】この要求に関して、特開平３−１１７６６
５号、特開平５−１８００８９号、特開平５−８９８５
９号等に、ＥＧＲガスをコンプレッサによって圧縮して
昇圧し、この昇圧したＥＧＲガスを吸気通路側に還流す
るように構成することによって、ＥＧＲ領域を拡大する
ＥＧＲ装置が提案されている。[0006] Regarding this request, Japanese Patent Laid-Open Publication No.
5, JP-A-5-180089, JP-A-5-8985
No. 9 proposes an EGR device that expands the EGR region by compressing the EGR gas by a compressor to increase the pressure and recirculating the increased EGR gas to the intake passage side.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、特開平
３−１１７６６５号の装置は、エンジンによって駆動さ
れるコンプレッサによりＥＧＲガスを圧縮し、アキュム
レータタンク内に蓄圧してから供給しているために、エ
ンジンの駆動力がこのコンプレッサに使用されるのでそ
の分エンジン出力のロスが大きくなる。このロスは、エ
ンジンが高回転、高負荷になるほど大きくなるので、高
出力が必要な時程ロスが大きくなるという問題がある。
更に、高回転、高負荷領域においてＥＧＲを行うため
に、容量の大きいコンプレッサ、アキュムレータが必要
になるという問題がある。However, in the device disclosed in Japanese Patent Application Laid-Open No. 3-117665, since the EGR gas is compressed by a compressor driven by the engine and stored in an accumulator tank, the EGR gas is supplied. Is used for this compressor, so that the loss of engine output increases accordingly. This loss increases as the engine speed increases and the load increases. Therefore, there is a problem that the loss increases when high output is required.
Further, there is a problem that a compressor and an accumulator having a large capacity are required to perform the EGR in a high rotation speed and a high load region.
【０００８】また、特開平５−１８００８９号の装置
は、排気ガスで駆動されるタービンを排気通路に設けて
このタービンに連結したＥＧＲガスコンプレッサでＥＧ
Ｒガスを加圧して、吸気通路に還流させている。しか
し、この装置においては排気通路に直列に排気ガスのパ
ワーを回収するパワータービンを含めて３つのタービン
を設けているため、ＥＧＲ作動時に排気マニホールドの
排気圧が大幅に上昇するので、ポンピングロスが大きく
なって燃費が悪化するという問題と、高負荷運転におい
て新気の減少を招き黒煙が発生してＥＧＲを行うことの
できる領域が限定されるという問題がある。In the apparatus disclosed in Japanese Patent Application Laid-Open No. H5-180089, a turbine driven by exhaust gas is provided in an exhaust passage, and an EGR gas compressor connected to the turbine is used for EG.
The R gas is pressurized and returned to the intake passage. However, in this device, since three turbines including a power turbine for recovering the power of the exhaust gas are provided in series in the exhaust passage, the exhaust pressure of the exhaust manifold rises significantly during the EGR operation, so that pumping loss is reduced. There is a problem that the fuel efficiency is deteriorated due to the increase in size, and there is a problem that a region where the EGR can be performed due to the generation of black smoke due to a decrease in fresh air during high load operation is limited.
【０００９】そして、特開平５−８９８５９号の装置
は、第１のターボチャージャで得られた圧縮空気を分岐
して第２のターボチャージャを駆動し、この第２のター
ボチャージャのコンプレッサでＥＧＲガスを昇圧し、そ
れと共に、このコンプレッサから圧縮空気を逃がして吸
気圧を下げてＥＧＲを行っている。しかし、この装置で
は、圧縮空気を分岐するため、シリンダへ供給される圧
縮吸気量が減少するので、ＥＧＲガス量に対する吸気量
が減少してスモークが発生するという問題がある。The apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 5-89859 divides the compressed air obtained by the first turbocharger to drive the second turbocharger, and the EGR gas is compressed by the compressor of the second turbocharger. , And at the same time, the compressed air is released from the compressor to lower the intake pressure to perform EGR. However, in this device, since the compressed air is branched, the amount of compressed intake air supplied to the cylinder is reduced, so that there is a problem that the amount of intake air with respect to the amount of EGR gas is reduced and smoke is generated.
【００１０】本発明は、上述の問題を解決するためにな
されたものであり、その目的は、エンジンの高負荷運転
時でもＥＧＲが可能で、しかも、シリンダへの吸気量を
十分に確保できてスモークの発生や燃料消費の悪化を防
止できると共に、更に、エンジンの運転状態に応じてＥ
ＧＲガスを昇圧して、効率よくＥＧＲを行うことができ
て、エンジンの全運転領域で排気ガス中のＮＯｘの排出
量を低減できる過給式エンジンのＥＧＲ装置を提供する
ことにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to make it possible to perform EGR even during high-load operation of an engine and to secure a sufficient amount of intake air to a cylinder. The generation of smoke and the deterioration of fuel consumption can be prevented.
It is an object of the present invention to provide an EGR device for a supercharged engine capable of efficiently performing EGR by increasing the pressure of GR gas and reducing the emission amount of NOx in exhaust gas in the entire operation range of the engine.
【００１１】[0011]
【課題を解決するための手段】以上のような目的を達成
するための過給式エンジンのＥＧＲ装置は、エンジンの
排気通路に設けたタービンによって、吸気通路に設けた
コンプレッサを駆動する過給式エンジンにおいて、排気
通路と吸気通路とを接続して第１ＥＧＲ通路を設けると
共に、該第１ＥＧＲ通路に、ＥＧＲガスを昇圧して吸気
通路に還流するＥＧＲガスコンプレッサを設け、該ＥＧ
Ｒガスコンプレッサと前記タービンとの間をクラッチ機
構を介して継脱自在に連結して構成したものであり、排
気通路にＥＧＲガスコンプレッサ用のタービンを新たに
設ける必要がなくなるので、排気圧の上昇を防ぐことが
でき、燃料消費の悪化を防止できる。しかも、吸気の分
岐及び逃がしによる吸気量の減少がないので、シリンダ
に供給される吸気量を十分に確保でき、スモークの発生
を防止しながら、ＥＧＲを行うことができる。SUMMARY OF THE INVENTION In order to achieve the above object, a supercharged EGR system for a supercharged engine drives a compressor provided in an intake passage by a turbine provided in an exhaust passage of the engine. In the engine, an exhaust passage and an intake passage are connected to provide a first EGR passage, and the first EGR passage is provided with an EGR gas compressor that boosts EGR gas and returns the EGR gas to the intake passage.
Since the R gas compressor and the turbine are connected and disconnected via a clutch mechanism so that it is not necessary to newly provide a turbine for the EGR gas compressor in the exhaust passage, the exhaust gas pressure rises. Can be prevented, and deterioration of fuel consumption can be prevented. Moreover, since there is no decrease in the intake air amount due to the branching and release of the intake air, the intake air amount supplied to the cylinder can be sufficiently ensured, and EGR can be performed while preventing the generation of smoke.
【００１２】また、前記排気通路の前記タービンより下
流側と吸気通路とを、前記ＥＧＲガスコンプレッサを配
設した前記第１ＥＧＲ通路で連結すると共に、前記排気
通路の前記タービンより上流側と吸気通路とを第２ＥＧ
Ｒ通路で連結する。更に、前記第１ＥＧＲ通路と前記第
２ＥＧＲ通路に、第１ＥＧＲ弁と第２ＥＧＲ弁をそれぞ
れ配設すると共に、エンジンの回転数を検出する回転数
センサーとエンジンの負荷を検出する負荷センサーを設
け、更に、前記回転数センサーの出力と前記負荷センサ
ーの出力とを入力して前記クラッチ機構と前記第１ＥＧ
Ｒ弁と前記第２ＥＧＲ弁の制御を行うコントローラを設
けて構成する。[0012] Further, the exhaust passage downstream of the turbine and the intake passage are connected by the first EGR passage provided with the EGR gas compressor, and the exhaust passage upstream of the turbine and the intake passage. To the second EG
Connect with R path. Further, a first EGR valve and a second EGR valve are respectively provided in the first EGR passage and the second EGR passage, and a rotation speed sensor for detecting an engine speed and a load sensor for detecting an engine load are further provided. , The output of the rotation speed sensor and the output of the load sensor are input to the clutch mechanism and the first EG.
A controller for controlling the R valve and the second EGR valve is provided.
【００１３】この構成により、エンジンの回転数や負荷
を入力してＥＧＲガス圧と吸気圧を推定し、この大小関
係に対応して２つのＥＧＲ通路を使い分けできるので、
エンジンのロスを防止しながら効率よくＥＧＲを行うこ
とができ、エンジンの運転領域全体において排気ガス中
のＮＯｘの低減を図ることができる。With this configuration, the EGR gas pressure and the intake pressure are estimated by inputting the engine speed and load, and the two EGR passages can be selectively used according to the magnitude relationship.
EGR can be performed efficiently while preventing loss of the engine, and NOx in exhaust gas can be reduced in the entire operation range of the engine.
【００１４】[0014]
【発明の実施の形態】以下、図面を用いて、本発明に係
る過給式エンジンのＥＧＲ装置の実施の形態を説明す
る。図１に示すように、第１の実施の形態の過給式エン
ジン１においては、タービン２を排気通路12に設けて、
吸気通路11に設けたコンプレッサ３を駆動して、新気Ａ
を圧縮して、この新気Ａをインタークーラ６を経由し
て、吸気マニホールド11ａに供給している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a supercharged engine EGR device according to the present invention will be described with reference to the drawings. As shown in FIG. 1, in a supercharged engine 1 according to the first embodiment, a turbine 2 is provided in an exhaust passage 12,
By driving the compressor 3 provided in the intake passage 11, fresh air A
And the fresh air A is supplied to the intake manifold 11a via the intercooler 6.
【００１５】このエンジン１の排気通路12と吸気通路11
とを第１ＥＧＲ通路９で連結し、更に、この第１ＥＧＲ
通路９にＥＧＲガスコンプレッサ５を設け、このＥＧＲ
ガスコンプレッサ５とタービン２との間をクラッチ機構
４を介して継脱自在に連結し、ＥＧＲガスコンプレッサ
５がタービン２の駆動力を受けて駆動されるように構成
する。The exhaust passage 12 and the intake passage 11 of the engine 1
Are connected by a first EGR passage 9, and furthermore, the first EGR
An EGR gas compressor 5 is provided in the passage 9 and the EGR gas
The gas compressor 5 and the turbine 2 are connected to each other via a clutch mechanism 4 so as to be freely connected and disconnected, so that the EGR gas compressor 5 is driven by receiving the driving force of the turbine 2.
【００１６】また、エンジン１の回転数を検出する回転
数センサー14とエンジンの負荷を検出する負荷センサー
15とコントローラ20を設ける。このコントローラ20が回
転数センサー14の出力と負荷センサー15の出力とを入力
して、クラッチ機構４の制御を行うように構成する。つ
まり、通常の新気Ａ用のコンプレッサ３に加えてＥＧＲ
ガスＧを圧縮するＥＧＲガスコンプレッサ５を第１ＥＧ
Ｒ通路９に設けて、エンジン１が高負荷運転状態で排気
ガス圧＜吸気圧（ブースト圧）のときに、クラッチ機構
４を連結してＥＧＲガスコンプレッサ５を駆動し、ＥＧ
Ｒガスの圧縮及び昇圧を行って、昇圧したＥＧＲガスＧ
を吸気通路11に供給するように構成する。A speed sensor 14 for detecting the speed of the engine 1 and a load sensor for detecting the load of the engine 1
15 and controller 20 are provided. The controller 20 receives the output of the rotation speed sensor 14 and the output of the load sensor 15 and controls the clutch mechanism 4. In other words, in addition to the normal compressor 3 for fresh air A,
The EGR gas compressor 5 for compressing the gas G is connected to the first EG
When the exhaust gas pressure is smaller than the intake pressure (boost pressure) while the engine 1 is in a high-load operation state, the clutch mechanism 4 is connected to drive the EGR gas compressor 5 to provide the EG.
The R gas is compressed and pressurized, and the pressurized EGR gas G
Is supplied to the intake passage 11.
【００１７】以上の構成により、第１ＥＧＲ通路９に設
けたＥＧＲガスコンプレッサ５により、ＥＧＲガスＧの
圧力を過給機のコンプレッサ３によって圧縮された新気
Ａの吸気圧よりも高圧にすることができるので、エンジ
ン１の高負荷運転領域でもＥＧＲを行うことができる。
また、図２に示す、第２の実施の形態では、排気通路13
のタービン２より下流側と吸気通路11とを、ＥＧＲガス
コンプレッサ５を配設した第１ＥＧＲ通路９で連結する
と共に、排気通路12のタービン２より上流側と吸気通路
11とを、第２ＥＧＲ通路19で連結する。With the above configuration, the pressure of the EGR gas G can be made higher than the intake pressure of the fresh air A compressed by the compressor 3 of the supercharger by the EGR gas compressor 5 provided in the first EGR passage 9. Therefore, EGR can be performed even in the high load operation range of the engine 1.
Further, in the second embodiment shown in FIG.
A downstream side of the turbine 2 and the intake passage 11 are connected by a first EGR passage 9 in which an EGR gas compressor 5 is disposed, and an upstream side of the exhaust passage 12 upstream of the turbine 2 and the intake passage 11 are connected.
11 are connected by a second EGR passage 19.
【００１８】このＥＧＲガスコンプレッサは、タービン
２の駆動力を受けて駆動できるように、図１の第１の実
施の形態と同様に、ＥＧＲガスコンプレッサ５とタービ
ン２との間をクラッチ機構４を介して継脱自在に連結し
て構成する。そして、更に、第１ＥＧＲ通路９に第１Ｅ
ＧＲ弁８を、また、第２ＥＧＲ通路19に、第２ＥＧＲ弁
18をそれぞれ配設し、また、エンジン１の回転数を検出
する回転数センサー14とエンジンの負荷を検出する負荷
センサー15とコントローラ20を設ける。このコントロー
ラ20が回転数センサー14の出力と負荷センサー15の出力
とを入力して、クラッチ機構４と第１ＥＧＲ弁８と第２
ＥＧＲ弁18の制御を行うように構成する。The EGR gas compressor connects the clutch mechanism 4 between the EGR gas compressor 5 and the turbine 2 in the same manner as in the first embodiment of FIG. It is configured to be connected and detachable via a connector. Further, the first EGR passage 9 has the first E
The second EGR valve is connected to the GR valve 8 and the second EGR passage 19.
18 are provided, and a speed sensor 14 for detecting the speed of the engine 1, a load sensor 15 for detecting the load of the engine, and a controller 20 are provided. The controller 20 receives the output of the rotation speed sensor 14 and the output of the load sensor 15, and outputs the clutch mechanism 4, the first EGR valve 8, and the second
The EGR valve 18 is configured to be controlled.
【００１９】以上の構成により、図３のＮ部分で示すエ
ンジン１の低・中負荷運転領域では、吸気圧が排気圧よ
り低いので、第１ＥＧＲ弁８を閉弁し、クラッチ機構４
をオフにすると共に、第２ＥＧＲ弁を開弁して、ＥＧＲ
ガスＧを第２ＥＧＲ通路19を経由させて、ＥＧＲガスＧ
を昇圧せずにそのまま吸気通路11に供給してＥＧＲを行
う。これにより、比較的低温・低圧の排気ガスＧが持つ
少ない排気エネルギーをＥＧＲガスの昇圧に使用するこ
となく、タービン２でコンプレッサ３だけを駆動して、
吸気側に十分利用できるので、シリンダへの十分な圧縮
空気量を確保することができる。With the above configuration, in the low / medium load operation region of the engine 1 indicated by the portion N in FIG. 3, the intake pressure is lower than the exhaust pressure, so that the first EGR valve 8 is closed and the clutch mechanism 4
Is turned off, the second EGR valve is opened, and the EGR
The EGR gas G is passed through the second EGR passage 19
Is supplied to the intake passage 11 as it is without increasing the pressure to perform EGR. As a result, only the compressor 3 is driven by the turbine 2 without using the low exhaust energy of the relatively low-temperature and low-pressure exhaust gas G for increasing the EGR gas.
Since it can be sufficiently used on the intake side, a sufficient amount of compressed air to the cylinder can be secured.
【００２０】また、この第２ＥＧＲ通路19の入口をター
ビン２より上流側に設けて構成したので、タービン２の
上流側の比較的圧力の高い部分の排気ガスＧをＥＧＲに
使用できるので、円滑にかつ効率的にＥＧＲガスを吸気
通路に還流できる。また、図３のＣ部分で示す高負荷運
転領域では、吸気圧が排気圧よりも高いので、第１ＥＧ
Ｒ弁８を開弁し、クラッチ機構４をオンにして駆動力を
伝達すると共に、第２ＥＧＲ弁18を閉弁して、ＥＧＲガ
スＧを第１ＥＧＲ通路９に導いて、ＥＧＲガスＧをＥＧ
Ｒガスコンプレッサ５で昇圧して吸気通路11に供給して
ＥＧＲを行う。Since the inlet of the second EGR passage 19 is provided on the upstream side of the turbine 2, the exhaust gas G in a relatively high pressure portion on the upstream side of the turbine 2 can be used for the EGR. In addition, the EGR gas can be efficiently returned to the intake passage. Further, in the high load operation region indicated by the portion C in FIG. 3, since the intake pressure is higher than the exhaust pressure, the first EG
The R valve 8 is opened, the clutch mechanism 4 is turned on to transmit the driving force, the second EGR valve 18 is closed, the EGR gas G is led to the first EGR passage 9, and the EGR gas G is
The pressure is increased by the R gas compressor 5 and supplied to the intake passage 11 to perform EGR.
【００２１】この高負荷運転領域Ｃでは、排気ガスＧの
エネルギーも大きくなるので、ＥＧＲガスコンプレッサ
５を駆動しても、コンプレッサ３で新気Ａを十分に圧縮
でき、しかも、圧縮された吸気Ａを全量シリンダへ供給
して、シリンダへの圧縮吸気量を確保できるので、適切
なＥＧＲ率を確保して、効率よくＥＧＲを行うことがで
きる。In the high-load operation region C, the energy of the exhaust gas G also increases, so that even if the EGR gas compressor 5 is driven, the fresh air A can be sufficiently compressed by the compressor 3 and the compressed intake air A Can be supplied to the cylinder and the amount of compressed intake air to the cylinder can be secured, so that an appropriate EGR rate can be secured and EGR can be performed efficiently.
【００２２】即ち、ウェイストゲート12ｂを開けて排気
ガスＧの一部逃がして吸気圧を下げる必要がなくなるの
で、排気ガスＧのエネルギーをタービン２で十分に利用
できる。また、この第１ＥＧＲ通路９の入口をタービン
２より下流側に設けて構成したので、ＥＧＲガスＧが吸
気通路11側に還流される前に、タービン２を通過させて
排気ガスＧのエネルギーを回収できるので、効率よくコ
ンプレッサ３を駆動できる。That is, there is no need to open the waste gate 12b to release part of the exhaust gas G to lower the intake pressure, so that the energy of the exhaust gas G can be sufficiently used in the turbine 2. Further, since the inlet of the first EGR passage 9 is provided on the downstream side of the turbine 2, the energy of the exhaust gas G is recovered by passing through the turbine 2 before the EGR gas G is recirculated to the intake passage 11 side. Therefore, the compressor 3 can be driven efficiently.
【００２３】従って、ＥＧＲガスＧの経路を、エンジン
１の回転数や負荷の状況に応じて、ＥＧＲガスＧを昇圧
する第１ＥＧＲ通路９とＥＧＲガスＧを昇圧しない第２
ＥＧＲ通路19を選択して、エンジンの運転状況に適した
ＥＧＲを効率よく行うことができる。Therefore, the path of the EGR gas G is divided into a first EGR passage 9 for increasing the pressure of the EGR gas G and a second EGR passage 9 for increasing the pressure of the EGR gas G in accordance with the rotational speed and load conditions of the engine 1.
By selecting the EGR passage 19, EGR suitable for the operating condition of the engine can be performed efficiently.
【００２４】[0024]
【発明の効果】以上の説明したように、請求項１に係る
本発明の過給式エンジンのＥＧＲ装置によれば、ＥＧＲ
ガスコンプレッサで昇圧したＥＧＲガスを吸気通路側に
供給してＥＧＲを行うので、ＥＧＲ可能なエンジンの運
転領域を高負荷領域にまで拡大することができる。As described above, according to the EGR system for a supercharged engine according to the first aspect of the present invention, the EGR device is provided.
Since the EGR gas pressurized by the gas compressor is supplied to the intake passage side to perform the EGR, the operation range of the engine capable of performing the EGR can be expanded to the high load range.
【００２５】そして、ＥＧＲガスコンプレッサをクラッ
チ機構を介して、排気通路に設けた吸気コンプレッサ用
のタービンで駆動するように構成したので、排気通路に
ＥＧＲガスコンプレッサ用のタービンを新たに設ける必
要がなくなり、排気圧の上昇を防止できるので、ポンピ
ングロスを抑制でき、燃料消費の悪化を防止できる。ま
た、請求項２及び請求項３に係る本発明の過給式エンジ
ンのＥＧＲ装置によれば、ＥＧＲガスを昇圧せずに吸気
側へ還流させるＥＧＲ通路を加えて、ＥＧＲ通路を２系
列にしたので、排気圧が吸気圧より高い運転領域では第
２ＥＧＲ通路を経由して吸気側へ還流させ、また、排気
圧が吸気圧より低い運転領域ではＥＧＲガスコンプレッ
サを設けた第１ＥＧＲ通路を経由させて昇圧したＥＧＲ
ガスを還流させることができるので、エンジンの回転数
や負荷の状況に応じて、エンジン出力のロスを防止しな
がら、効率よくＥＧＲを行うことができる。Since the EGR gas compressor is driven by the turbine for the intake compressor provided in the exhaust passage via the clutch mechanism, it is not necessary to newly provide a turbine for the EGR gas compressor in the exhaust passage. In addition, since an increase in exhaust pressure can be prevented, pumping loss can be suppressed, and deterioration of fuel consumption can be prevented. Further, according to the EGR device of the supercharged engine according to the second and third aspects of the present invention, the EGR passage for returning the EGR gas to the intake side without increasing the pressure is added, and the EGR passage is divided into two lines. Therefore, in the operation region where the exhaust pressure is higher than the intake pressure, the gas is recirculated to the intake side via the second EGR passage, and in the operation region where the exhaust pressure is lower than the intake pressure, the gas is passed through the first EGR passage provided with the EGR gas compressor. Increased EGR
Since the gas can be recirculated, EGR can be performed efficiently while preventing loss of the engine output according to the engine speed and load conditions.
【図１】本発明に係る第１の実施の形態の過給式エンジ
ンのＥＧＲ装置の構成図である。FIG. 1 is a configuration diagram of an EGR device of a supercharged engine according to a first embodiment of the present invention.
【図２】本発明に係る第２の実施の形態の過給式エンジ
ンのＥＧＲ装置の構成図である。FIG. 2 is a configuration diagram of an EGR device of a supercharged engine according to a second embodiment of the present invention.
【図３】本発明に係る過給式エンジンのＥＧＲ装置のＥ
ＧＲ領域とＥＧＲ運転方法を示す模式図である。FIG. 3 shows E of the EGR device of the supercharged engine according to the present invention.
It is a schematic diagram which shows a GR area and an EGR operation method.
【図４】従来技術のＥＧＲ領域を示す模式図で、（ａ）
は、過給式エンジンのＥＧＲ装置のＥＧＲ領域を、
（ｂ）はＶＧターボエンジンにおけるＥＧＲ装置のＥＧ
Ｒ領域を示す。FIG. 4 is a schematic view showing an EGR region according to the related art, and FIG.
Is the EGR range of the EGR device of the supercharged engine,
(B) EG of the EGR device in the VG turbo engine
The R region is shown.
【図５】従来技術の過給式エンジンのＥＧＲ装置の構成
図である。FIG. 5 is a configuration diagram of a conventional EGR device for a supercharged engine.
１ エンジン ２ 過給機のター
ビン ３ 過給機のコンプレッサ ４ クラッチ機構 ５ ＥＧＲガスコンプレッサ ６ インタークー
ラ ７ ＥＧＲクーラ ８ 第１ＥＧＲ弁 ９ 第１ＥＧＲ通路 11 吸気通路 11ａ 吸気マニホールド 12 上流側排気通
路 12ａ 排気マニホールド 12ｂ ウェイストゲ
ート 13 下流側排気通路 14 回転数センサ
ー 15 負荷センサー 18 第２ＥＧＲ弁 19 第２ＥＧＲ通路 20 コントローラREFERENCE SIGNS LIST 1 engine 2 turbocharger turbine 3 turbocharger compressor 4 clutch mechanism 5 EGR gas compressor 6 intercooler 7 EGR cooler 8 first EGR valve 9 first EGR passage 11 intake passage 11a intake manifold 12 upstream exhaust passage 12a exhaust manifold 12b Waste gate 13 Downstream exhaust passage 14 Speed sensor 15 Load sensor 18 Second EGR valve 19 Second EGR passage 20 Controller
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｆ０２Ｂ 39/12 Ｆ０２Ｂ 37/00 ３０１Ａ ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI F02B 39/12 F02B 37/00 301A
Claims (3)
よって、吸気通路に設けたコンプレッサを駆動する過給
式エンジンにおいて、排気通路と吸気通路とを接続して
第１ＥＧＲ通路を設けると共に、該第１ＥＧＲ通路に、
ＥＧＲガスを昇圧して吸気通路に還流するＥＧＲガスコ
ンプレッサを設け、該ＥＧＲガスコンプレッサと前記タ
ービンとの間をクラッチ機構を介して継脱自在に連結し
た過給式エンジンのＥＧＲ装置。In a supercharged engine in which a turbine provided in an exhaust passage of an engine drives a compressor provided in an intake passage, an exhaust passage and an intake passage are connected to provide a first EGR passage, and the first EGR passage is provided. In the passage,
An EGR device for a supercharged engine in which an EGR gas compressor for increasing the pressure of EGR gas and recirculating it to an intake passage is provided, and the EGR gas compressor and the turbine are connected and disconnected via a clutch mechanism.
と吸気通路とを、前記ＥＧＲガスコンプレッサを配設し
た前記第１ＥＧＲ通路で連結すると共に、前記排気通路
の前記タービンより上流側と吸気通路とを第２ＥＧＲ通
路で連結した請求項１記載の過給式エンジンのＥＧＲ装
置。2. An exhaust passage downstream of the turbine and an intake passage connected by the first EGR passage provided with the EGR gas compressor, and an exhaust passage upstream of the turbine and an intake passage. The EGR device for a supercharged engine according to claim 1, wherein the EGR device is connected by a second EGR passage.
路に、第１ＥＧＲ弁と第２ＥＧＲ弁をそれぞれ配設する
と共に、エンジンの回転数を検出する回転数センサーと
エンジンの負荷を検出する負荷センサーを設け、更に、
前記回転数センサーの出力と前記負荷センサーの出力と
を入力して前記クラッチ機構と前記第１ＥＧＲ弁と前記
第２ＥＧＲ弁の制御を行うコントローラを設けた請求項
２記載の過給式エンジンのＥＧＲ装置。3. A first EGR valve and a second EGR valve are respectively disposed in the first EGR passage and the second EGR passage, and a rotation speed sensor for detecting an engine speed and a load sensor for detecting an engine load are provided. Provided, and
3. A supercharged engine EGR device according to claim 2, further comprising a controller that receives an output of said rotation speed sensor and an output of said load sensor and controls said clutch mechanism, said first EGR valve and said second EGR valve. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22511397A JP3674254B2 (en) | 1997-08-21 | 1997-08-21 | EGR device for supercharged engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22511397A JP3674254B2 (en) | 1997-08-21 | 1997-08-21 | EGR device for supercharged engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1162715A true JPH1162715A (en) | 1999-03-05 |
| JP3674254B2 JP3674254B2 (en) | 2005-07-20 |
Family
ID=16824187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22511397A Expired - Fee Related JP3674254B2 (en) | 1997-08-21 | 1997-08-21 | EGR device for supercharged engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3674254B2 (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002068809A1 (en) * | 2001-02-26 | 2002-09-06 | Mitsubishi Heavy Industries, Ltd. | Exhaust gas recirculating engine with scrubber and exhaust gas recirculating system |
| JP2003519309A (en) * | 1999-06-18 | 2003-06-17 | アライドシグナル インコーポレイテッド | Turbocharger with integrated exhaust gas recirculation pump |
| US6945236B2 (en) | 2003-07-02 | 2005-09-20 | Mazda Motor Corporation | EGR control apparatus for engine |
| WO2008062315A2 (en) * | 2006-11-23 | 2008-05-29 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| JP2010096161A (en) * | 2008-10-20 | 2010-04-30 | Toyota Motor Corp | Exhaust emission control device |
| JP2010121469A (en) * | 2008-11-17 | 2010-06-03 | Toyota Motor Corp | Exhaust emission control device |
| KR101014068B1 (en) | 2008-07-15 | 2011-02-14 | 현대자동차주식회사 | Turbo Charger of Engine |
| JP2012505994A (en) * | 2008-10-17 | 2012-03-08 | ラフバラ・ユニバーシティ | Exhaust structure for engine |
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| CN103306804A (en) * | 2013-05-31 | 2013-09-18 | 长城汽车股份有限公司 | Turbo-supercharger for automotive engine |
| US9556824B2 (en) | 2014-03-25 | 2017-01-31 | Hanon Systems | Integration of forced EGR/EGR-pump into EGR-cooler |
| GB2540758A (en) * | 2015-07-23 | 2017-02-01 | Gm Global Tech Operations Llc | A long route EGR system for a turbocharged automotive system |
| CN109356752A (en) * | 2018-12-28 | 2019-02-19 | 潍柴动力股份有限公司 | A kind of gas recirculation system and engine |
| CN113286942A (en) * | 2018-12-28 | 2021-08-20 | 潍柴动力股份有限公司 | Exhaust gas recirculation system and engine |
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|---|---|---|---|---|
| JP2003519309A (en) * | 1999-06-18 | 2003-06-17 | アライドシグナル インコーポレイテッド | Turbocharger with integrated exhaust gas recirculation pump |
| WO2002068809A1 (en) * | 2001-02-26 | 2002-09-06 | Mitsubishi Heavy Industries, Ltd. | Exhaust gas recirculating engine with scrubber and exhaust gas recirculating system |
| US6945236B2 (en) | 2003-07-02 | 2005-09-20 | Mazda Motor Corporation | EGR control apparatus for engine |
| US8302400B2 (en) | 2006-11-23 | 2012-11-06 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| WO2008062315A2 (en) * | 2006-11-23 | 2008-05-29 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| WO2008062254A1 (en) * | 2006-11-23 | 2008-05-29 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| WO2008062315A3 (en) * | 2006-11-23 | 2008-07-17 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| US8479512B2 (en) | 2006-11-23 | 2013-07-09 | Renault Trucks | Internal combustion engine comprising an exhaust gas recirculation system |
| KR101014068B1 (en) | 2008-07-15 | 2011-02-14 | 현대자동차주식회사 | Turbo Charger of Engine |
| JP2012505994A (en) * | 2008-10-17 | 2012-03-08 | ラフバラ・ユニバーシティ | Exhaust structure for engine |
| JP2010096161A (en) * | 2008-10-20 | 2010-04-30 | Toyota Motor Corp | Exhaust emission control device |
| US8250865B2 (en) | 2008-11-05 | 2012-08-28 | Ford Global Technologies, Llc | Using compressed intake air to clean engine exhaust gas recirculation cooler |
| JP2010121469A (en) * | 2008-11-17 | 2010-06-03 | Toyota Motor Corp | Exhaust emission control device |
| CN103306804A (en) * | 2013-05-31 | 2013-09-18 | 长城汽车股份有限公司 | Turbo-supercharger for automotive engine |
| US9556824B2 (en) | 2014-03-25 | 2017-01-31 | Hanon Systems | Integration of forced EGR/EGR-pump into EGR-cooler |
| GB2540758A (en) * | 2015-07-23 | 2017-02-01 | Gm Global Tech Operations Llc | A long route EGR system for a turbocharged automotive system |
| US11754005B2 (en) * | 2018-06-29 | 2023-09-12 | Volvo Truck Corporation | Internal combustion engine |
| CN109356752A (en) * | 2018-12-28 | 2019-02-19 | 潍柴动力股份有限公司 | A kind of gas recirculation system and engine |
| CN113286942A (en) * | 2018-12-28 | 2021-08-20 | 潍柴动力股份有限公司 | Exhaust gas recirculation system and engine |
| US11448168B2 (en) | 2018-12-28 | 2022-09-20 | Weichai Power Co., Ltd. | Exhaust gas recirculation system and engine |
| CN114263551A (en) * | 2021-12-21 | 2022-04-01 | 天津大学 | EGR system |
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