JP2002089376A - Egr device - Google Patents
Egr deviceInfo
- Publication number
- JP2002089376A JP2002089376A JP2000273282A JP2000273282A JP2002089376A JP 2002089376 A JP2002089376 A JP 2002089376A JP 2000273282 A JP2000273282 A JP 2000273282A JP 2000273282 A JP2000273282 A JP 2000273282A JP 2002089376 A JP2002089376 A JP 2002089376A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- intake
- gas
- passage
- amount
- 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
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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
- F02M26/20—Feeding recirculated exhaust gases directly into the combustion chambers or into the intake runners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/42—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders
- F02M26/44—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories having two or more EGR passages; EGR systems specially adapted for engines having two or more cylinders in which a main EGR passage is branched into multiple passages
-
- 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
- F02B29/0425—Air cooled heat exchangers
-
- 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
- F02M26/23—Layout, e.g. schematics
Landscapes
- 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
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ＥＧＲ装置に関
し、特にＥＧＲ分配管によって各気筒毎にＥＧＲガスを
分配するＥＧＲ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EGR device, and more particularly to an EGR device that distributes EGR gas to each cylinder by an EGR distribution pipe.
【０００２】[0002]
【従来の技術】従来、ディーゼルエンジン等の内燃機関
においては、ＮＯｘの発生を抑制するための手法として
排気ガス再循環装置（Exhaust Gas Recirculation Syst
em、以下、単にＥＧＲ装置と言う）が用いられている。
ＥＧＲ装置は、エンジンの排気通路と吸気通路とをＥＧ
Ｒ通路により接続し、このＥＧＲ通路を介して排気ガス
（ＥＧＲガス）を吸気通路内に再循環させている。ＥＧ
Ｒガスは新気に比較して比熱が高く、多量の熱を吸収す
ることができるので、ＥＧＲガスの導入量を増大するほ
ど、即ち、ＥＧＲ率〔ＥＧＲガス導入量／（ＥＧＲガス
導入量＋新気吸入量）〕を増大するほど、燃焼室内にお
ける燃焼温度は低下する。ＮＯｘの発生量は燃焼温度の
低下に伴い低下するので、従ってＥＧＲ率を増大するほ
どＮＯｘの発生量を低減することができる。2. Description of the Related Art Conventionally, in an internal combustion engine such as a diesel engine, an exhaust gas recirculation system (Exhaust Gas Recirculation Syst
em, hereinafter simply referred to as an EGR device).
The EGR device connects the exhaust passage and the intake passage of the engine to the EG.
The exhaust gas (EGR gas) is recirculated through the EGR passage into the intake passage. EG
Since the R gas has a higher specific heat than fresh air and can absorb a large amount of heat, the larger the amount of EGR gas introduced, that is, the EGR rate [EGR gas introduction amount / (EGR gas introduction amount + As the amount of fresh air intake increases), the combustion temperature in the combustion chamber decreases. Since the amount of generated NOx decreases as the combustion temperature decreases, the amount of generated NOx can be reduced as the EGR rate increases.
【０００３】ここで、図４は、ディーゼルエンジンに備
えられる従来の一般的なＥＧＲ装置の構成を示す模式図
である。まず、図４に示すＥＧＲ装置３０は、排気通路
４を構成する排気マニホールド６と吸気通路３を構成す
る吸気マニホールド５の集合管５ａの上流部とをＥＧＲ
管１１によって連結したものである。ＥＧＲ管１１の途
中には排気マニホールド６から取り出されたＥＧＲガス
を冷却するためのＥＧＲクーラ１２が配設され、ＥＧＲ
クーラ１２の下流で吸気マニホールド側端部近傍にはエ
ンジンの運転状態に応じてＥＧＲガス導入量を調整する
ためのＥＧＲバルブ１３が設けられている。排気マニホ
ールド６より取り出されたＥＧＲガスは、エンジン１の
吸気行程において発生した負圧によりＥＧＲ管１１から
吸気通路３内に導入される。そして、吸気マニホールド
５の集合管５ａ内でエアクリーナ７等を経て吸入された
新気と混合される。FIG. 4 is a schematic diagram showing a configuration of a conventional general EGR device provided in a diesel engine. First, the EGR device 30 shown in FIG. 4 connects the exhaust manifold 6 forming the exhaust passage 4 and the upstream part of the collecting pipe 5a of the intake manifold 5 forming the intake passage 3 with the EGR.
It is connected by a tube 11. An EGR cooler 12 for cooling EGR gas taken out of the exhaust manifold 6 is provided in the middle of the EGR pipe 11.
An EGR valve 13 is provided downstream of the cooler 12 and near the intake manifold side end to adjust the amount of EGR gas introduced according to the operating state of the engine. The EGR gas extracted from the exhaust manifold 6 is introduced into the intake passage 3 from the EGR pipe 11 by a negative pressure generated in an intake stroke of the engine 1. Then, the air is mixed with fresh air sucked through the air cleaner 7 and the like in the collecting pipe 5a of the intake manifold 5.
【０００４】集合管５ａ内に導入されたＥＧＲガスは、
吸気弁が開放され吸気通路３内が負圧になることによっ
て、新気とともに各気筒２Ａ〜２Ｄに対応する枝管５ｂ
からシリンダヘッド１の吸気ポート１ａを経由してそれ
ぞれの気筒２Ａ〜２Ｄ内へ吸入される。ところが、ＥＧ
Ｒガスが吸気通路４に吸入されてから各気筒２Ａ〜２Ｄ
内に吸い込まれるまでの時間はＥＧＲガスが新気と十分
混合するには短いため、ＥＧＲガスと新気とは完全には
混じり合っていない。また、集合管５ａの入口から枝管
５ｂの入口までの距離には気筒間で差があり、例えば、
第１気筒２ＡへＥＧＲガスが吸入される場合、途中で第
２気筒２Ｂ〜第４気筒２ＤにもＥＧＲガスが若干流入す
る虞がある。このため、図４に示す構成のＥＧＲ装置３
０では、気筒２Ａ〜２Ｄ間における吸入ガスのＥＧＲ率
にばらつきが生じる可能性がある。気筒２Ａ〜２Ｄ間の
ＥＧＲ率のばらつきは、各気筒２Ａ〜２Ｄに於けるＮＯ
ｘや黒煙の発生を不均一にするとともに、燃焼騒音や振
動等を招きエンジンの円滑な運転を妨げてしまう。The EGR gas introduced into the collecting pipe 5a is:
When the intake valve is opened and the pressure in the intake passage 3 becomes negative, the branch pipe 5b corresponding to each of the cylinders 2A to 2D together with fresh air.
Is drawn into each of the cylinders 2A to 2D via the intake port 1a of the cylinder head 1. However, EG
After the R gas is sucked into the intake passage 4, each of the cylinders 2A to 2D
Since the time until the EGR gas is sucked into the air is short enough for the EGR gas to sufficiently mix with the fresh air, the EGR gas and the fresh air are not completely mixed. In addition, there is a difference between the cylinders in the distance from the inlet of the collecting pipe 5a to the inlet of the branch pipe 5b.
When the EGR gas is sucked into the first cylinder 2A, there is a possibility that the EGR gas slightly flows into the second cylinder 2B to the fourth cylinder 2D on the way. Therefore, the EGR device 3 having the configuration shown in FIG.
At 0, the EGR rate of the intake gas between the cylinders 2A to 2D may vary. The variation in the EGR rate among the cylinders 2A to 2D is caused by the NO in each of the cylinders 2A to 2D.
This makes the generation of x and black smoke non-uniform, and causes combustion noise, vibration, and the like, which hinders smooth operation of the engine.
【０００５】上記のような排気ガス，燃焼騒音及び振動
等の不具合を改善するために提案され実用化されたの
が、図５に示す構成のＥＧＲ装置４０である。このＥＧ
Ｒ装置４０は、ＥＧＲ管１１のＥＧＲバルブ１３よりも
下流側に各気筒２Ａ〜２Ｄに対応するＥＧＲ分配管１４
を形成し、ＥＧＲ分配管１４の先端部を吸気マニホール
ド５の枝管５ｂに連結したものである。このＥＧＲ装置
４０では、排気マニホールド６から取り出されたＥＧＲ
ガスはＥＧＲ分配管１４から各枝管５ｂ内に直接導入さ
れることになるため、ある特定の気筒に吸入される予定
のＥＧＲガスが他の気筒に流入してしまう虞はない。従
って、図５に示す構成のＥＧＲ装置４０によれば、各気
筒２Ａ〜２Ｄ毎のＥＧＲ率のばらつきを防止して上記の
不具合を改善することができる。An EGR device 40 shown in FIG. 5 has been proposed and put to practical use in order to improve the above-mentioned problems such as exhaust gas, combustion noise and vibration. This EG
The R device 40 includes an EGR distribution pipe 14 corresponding to each of the cylinders 2 </ b> A to 2 </ b> D downstream of the EGR valve 13 of the EGR pipe 11.
And the front end of the EGR distribution pipe 14 is connected to the branch pipe 5 b of the intake manifold 5. In the EGR device 40, the EGR taken out of the exhaust manifold 6
Since the gas is directly introduced into each branch pipe 5b from the EGR distribution pipe 14, there is no possibility that the EGR gas scheduled to be drawn into one specific cylinder flows into another cylinder. Therefore, according to the EGR device 40 having the configuration shown in FIG. 5, it is possible to prevent the variation in the EGR rate for each of the cylinders 2 </ b> A to 2 </ b> D and to solve the above-described problem.
【０００６】[0006]
【発明が解決しようとする課題】ところで、排気ガス中
に含まれる有害物質、特にＮＯｘの低減は、大気汚染等
の環境問題における重要なテーマである。前述したよう
に、ＮＯｘの発生量はＥＧＲ率を増大させることにより
低減することができるので、ＥＧＲ率を増大させて燃焼
温度を低下させることはＮＯｘを低減させる有効な手法
の一つであり、ＥＧＲ率を如何に増大させることができ
るかが、近年、重要な技術課題になっている。The reduction of harmful substances contained in exhaust gas, especially NOx, is an important theme in environmental problems such as air pollution. As described above, since the amount of generated NOx can be reduced by increasing the EGR rate, decreasing the combustion temperature by increasing the EGR rate is one of effective methods for reducing NOx. How to increase the EGR rate has been an important technical issue in recent years.
【０００７】ＥＧＲ装置４０は、排気通路４と吸気通路
３との圧力差（吸排気圧力差）を利用してＥＧＲガスを
排気通路４から吸気通路３へ再循環させる装置である。
このため、従来は、ＥＧＲガスの吸気通路３への導入は
その殆どが吸排気圧力差が最も大きくなる吸気行程中に
行なわれ、吸排気圧力差の小さい他の行程で導入される
ＥＧＲガスの量は少ないものと考えられていた。The EGR device 40 is a device that recirculates EGR gas from the exhaust passage 4 to the intake passage 3 by utilizing a pressure difference between the exhaust passage 4 and the intake passage 3 (intake / exhaust pressure difference).
For this reason, conventionally, most of the EGR gas is introduced into the intake passage 3 during the intake stroke in which the intake / exhaust pressure difference is the largest, and the EGR gas introduced in the other stroke in which the intake / exhaust pressure difference is small. The amount was considered small.
【０００８】ところが、本発明者等が図５に示すＥＧＲ
装置４０の吸排気系の流れを３次元数値解析により解析
し、各気筒内のＥＧＲガスの量と新気の量の変化を分析
したところ、図６に示すような結果が得られた。図６は
吸気弁が開いてから閉じるまでの間に気筒内に吸入され
たガスの量を、クランク角を横軸にとり時間当たり吸入
量を縦軸にとって示したものである。図６中において一
点鎖線は新気を示し、二点鎖線はＥＧＲガスを示してい
る。また、実線は新気とＥＧＲガスとの総和（吸入ガス
全体）を示している。However, the present inventors have found that the EGR shown in FIG.
The flow of the intake / exhaust system of the device 40 was analyzed by three-dimensional numerical analysis, and the change in the amount of EGR gas and the amount of fresh air in each cylinder was analyzed. The results shown in FIG. 6 were obtained. FIG. 6 shows the amount of gas sucked into the cylinder between the opening and closing of the intake valve, with the crank angle on the horizontal axis and the intake amount per hour on the vertical axis. In FIG. 6, the one-dot chain line indicates fresh air, and the two-dot chain line indicates EGR gas. The solid line indicates the sum of fresh air and EGR gas (the entire intake gas).
【０００９】図６においてＥＧＲガスの吸入量の変化に
着目すると、ＥＧＲガスの吸入量には２つの山が存在し
ており、ＥＧＲガスは吸気弁が開いた直後に大量に吸入
され、一旦吸入量が低下した後、新気の吸入量の増加に
対応して再び増加することが分かる。新気の吸入量の変
化に対応している方の山は、ピストンの下降による吸気
通路２内の圧力低下に伴い吸気行程中にＥＧＲ分配管１
４から気筒内に吸い込まれたＥＧＲガスを示している。
一方、吸気弁が開いた直後の山は、吸気行程前に既にＥ
ＧＲ分配管１４から枝管５ｂ内及び吸気ポート１ａ内に
噴出していたＥＧＲガスを示している。つまり、ＥＧＲ
ガスは、従来考えられていたようにその殆どが吸気行程
中にＥＧＲ管１１から吸気通路３へ吸い込まれるのでは
なく、吸気行程中に吸い込まれるのと同等のＥＧＲガス
が吸気行程以外の行程で既に吸気通路３内に噴出してい
るのである。Referring to the change in the intake amount of the EGR gas in FIG. 6, there are two peaks in the intake amount of the EGR gas, and a large amount of the EGR gas is inhaled immediately after the intake valve opens, and is temporarily inhaled. It can be seen that after the amount has decreased, it increases again in response to the increase in the inhaled amount of fresh air. The peak corresponding to the change in the intake amount of fresh air is the EGR distribution pipe 1 during the intake stroke due to the pressure decrease in the intake passage 2 due to the lowering of the piston.
4 shows the EGR gas sucked into the cylinder.
On the other hand, the peak immediately after the intake valve is opened is already E before the intake stroke.
The figure shows EGR gas that has been ejected from the GR distribution pipe 14 into the branch pipe 5b and into the intake port 1a. That is, EGR
Most of the gas is not sucked into the intake passage 3 from the EGR pipe 11 during the intake stroke, as is conventionally thought, but the same EGR gas as is sucked during the intake stroke is used in a stroke other than the intake stroke. It has already been jetted into the intake passage 3.
【００１０】以上のことから、気筒内へのＥＧＲガスの
導入量を増大させＥＧＲ率を増大させるには、吸気行程
中にＥＧＲ管１１から吸気通路３へ吸い込まれるＥＧＲ
ガスの量を増大させるだけでなく、吸気行程以外の行程
でＥＧＲ管１１から吸気通路３内に噴出するＥＧＲガス
の量を増大させることも有効であることが分かった。特
に、吸排気圧力差が小さい運転領域では、吸気行程中に
ＥＧＲ管１１から吸い込まれるＥＧＲガスには限度があ
るため、吸気行程以外の行程で如何に多量のＥＧＲガス
をＥＧＲ管１１から吸気通路３内に噴出させておくか
が、ＥＧＲガスの導入量を増大させＥＧＲ率を増大させ
る上で重要になる。As described above, in order to increase the amount of EGR gas introduced into the cylinder and increase the EGR rate, the EGR sucked from the EGR pipe 11 into the intake passage 3 during the intake stroke.
It has been found that not only increasing the amount of gas but also increasing the amount of EGR gas ejected from the EGR pipe 11 into the intake passage 3 during a stroke other than the intake stroke is effective. In particular, in an operation region where the intake / exhaust pressure difference is small, the amount of EGR gas sucked from the EGR pipe 11 during the intake stroke is limited, so how much EGR gas is discharged from the EGR pipe 11 to the intake passage during a stroke other than the intake stroke. It is important whether the gas is ejected into the inside 3 in order to increase the introduction amount of the EGR gas and increase the EGR rate.
【００１１】本発明は、このような課題に鑑み創案され
たもので、吸気行程以外の行程でＥＧＲ通路から吸気通
路内に噴出するＥＧＲガスの量を増やすことによって、
気筒内に吸入される吸入ガスのＥＧＲ率を増大させるこ
とを可能にした、ＥＧＲ装置を提供することを目的とす
る。The present invention has been made in view of such a problem, and by increasing the amount of EGR gas injected from the EGR passage into the intake passage in a stroke other than the intake stroke,
It is an object of the present invention to provide an EGR device capable of increasing an EGR rate of intake gas sucked into a cylinder.
【００１２】[0012]
【課題を解決するための手段】上記目的を達成するため
に、本発明のＥＧＲ装置では、エンジンの排気通路と吸
気通路とを接続するＥＧＲ通路の下流側に各気筒に対応
して分岐するＥＧＲ分配管を設けるとともに、吸気マニ
ホールドの枝管の端部近傍にＥＧＲ室を設け、このＥＧ
Ｒ室にＥＧＲ分配管を接続することにより、吸気行程以
外の行程でＥＧＲ分配管から吸気通路内に噴出してくる
ＥＧＲガスをＥＧＲ室で蓄えるようにしている。In order to achieve the above-mentioned object, an EGR device according to the present invention includes an EGR device which branches off corresponding to each cylinder downstream of an EGR passage connecting an exhaust passage and an intake passage of an engine. A distribution pipe is provided, and an EGR chamber is provided near the end of the branch pipe of the intake manifold.
By connecting an EGR distribution pipe to the R chamber, EGR gas ejected from the EGR distribution pipe into the intake passage during a stroke other than the intake stroke is stored in the EGR chamber.
【００１３】[0013]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態について説明する。図１〜図３は、本発明の一実
施形態としてのＥＧＲ装置について示すものであり、本
実施形態では、本発明のＥＧＲ装置をディーゼルエンジ
ンのＥＧＲ装置として構成している。なお、各図におい
て、前記した従来のＥＧＲ装置（図４，図５参照）と同
一の部位については同一の符号を用いて示している。Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an EGR device according to an embodiment of the present invention. In the embodiment, the EGR device of the present invention is configured as an EGR device of a diesel engine. In each figure, the same parts as those of the above-described conventional EGR device (see FIGS. 4 and 5) are denoted by the same reference numerals.
【００１４】本ＥＧＲ装置が適用されるエンジン（ディ
ーゼルエンジン）は、図１に示すように複数の気筒２Ａ
〜２Ｄを有する多気筒エンジンであり、各気筒２Ａ〜２
Ｄに連通して吸気通路３と排気通路４とを備えている。
吸気通路３には、その上流側から順にエアクリーナ７，
ターボチャージャ８のコンプレッサ８ａ及びインターク
ーラ９が備えられ、吸気通路３の最下流部には吸気マニ
ホールド５が設けられている。吸気マニホールド５は、
集合管５ａと集合管５ａから各気筒２Ａ〜２Ｄに分岐し
て形成された複数の枝管５ｂとからなり、枝管５ｂの下
流側端部がシリンダヘッド１に形成された吸気ポート１
ａに連結されている。一方、排気通路４には、その上流
側から順に排気マニホールド６，ターボチャージャ８の
タービン８ｂ及び触媒１０が備えられ、排気マニホール
ド６がシリンダヘッド１に形成された排気ポート１ｂに
連結されている。An engine (diesel engine) to which the present EGR device is applied has a plurality of cylinders 2A as shown in FIG.
Is a multi-cylinder engine having up to 2D.
D is provided with an intake passage 3 and an exhaust passage 4.
In the intake passage 3, air cleaners 7,
The compressor 8a and the intercooler 9 of the turbocharger 8 are provided, and the intake manifold 5 is provided at the most downstream portion of the intake passage 3. The intake manifold 5
An intake port 1 formed of a collecting pipe 5a and a plurality of branch pipes 5b branched from the collecting pipe 5a into the respective cylinders 2A to 2D, the downstream end of the branch pipe 5b being formed in the cylinder head 1.
a. On the other hand, the exhaust passage 4 is provided with an exhaust manifold 6, a turbine 8b of a turbocharger 8, and a catalyst 10 in this order from the upstream side, and the exhaust manifold 6 is connected to an exhaust port 1b formed in the cylinder head 1.
【００１５】本ＥＧＲ装置２０は、各気筒２Ａ〜２Ｄ毎
にＥＧＲガスを分配する形式のＥＧＲ装置であり、ＥＧ
Ｒ管１１の下流側には各気筒２Ａ〜２Ｄに対応するＥＧ
Ｒ分配管１４が形成されている。ＥＧＲ管１１は、排気
通路４から吸気通路３へＥＧＲガスを再循環させるため
の通路（ＥＧＲ通路）であり、その上流側端部は排気マ
ニホールド６に接続されている。そして、ＥＧＲ管１１
の途中には排気マニホールド６から取り出されたＥＧＲ
ガスを冷却するためのＥＧＲクーラ１２が配設され、Ｅ
ＧＲクーラ１２の下流にはエンジンの運転状態に応じて
ＥＧＲガスの導入量を調整するためのＥＧＲバルブ１３
が設けられている。そして、このＥＧＲバルブ１３の下
流側において、ＥＧＲ分配管１４が各気筒２Ａ〜２Ｄに
対応して分岐している。The EGR device 20 is a type of EGR device that distributes EGR gas to each of the cylinders 2A to 2D.
An EG corresponding to each of the cylinders 2A to 2D is provided downstream of the R pipe 11.
An R distribution pipe 14 is formed. The EGR pipe 11 is a passage (EGR passage) for recirculating EGR gas from the exhaust passage 4 to the intake passage 3, and an upstream end thereof is connected to the exhaust manifold 6. And the EGR pipe 11
EGR taken out of the exhaust manifold 6
An EGR cooler 12 for cooling the gas is provided.
Downstream of the GR cooler 12 is an EGR valve 13 for adjusting the amount of EGR gas introduced according to the operating state of the engine.
Is provided. Further, on the downstream side of the EGR valve 13, the EGR distribution pipe 14 is branched corresponding to each of the cylinders 2A to 2D.
【００１６】本ＥＧＲ装置２０においては、図１及び図
２に示すように、吸気マニホールド５の各枝管５ｂの端
部近傍にはＥＧＲ室１５が形成されている。ＥＧＲ室１
５は、枝管５ｂよりも内径を大きくすることによって形
成された容積部であり、吸気通路３はこのＥＧＲ室１５
の形成部分において流路面積が拡大されている。そし
て、このＥＧＲ室１５の周壁部にＥＧＲ分配管１４の先
端部が接続され、ＥＧＲ管１１を吸気通路３に連通させ
ている。In the EGR device 20, as shown in FIGS. 1 and 2, an EGR chamber 15 is formed near the end of each branch pipe 5b of the intake manifold 5. EGR room 1
Reference numeral 5 denotes a volume formed by making the inner diameter larger than that of the branch pipe 5b.
The area of the flow path is enlarged in the formation part of. The distal end of the EGR distribution pipe 14 is connected to the peripheral wall of the EGR chamber 15, and connects the EGR pipe 11 to the intake passage 3.
【００１７】上記のように構成されることにより、本発
明の一実施形態としてのＥＧＲ装置によれば、吸気行程
以外の行程中に吸排気圧力差によりＥＧＲ分配管１４か
ら噴出したＥＧＲガスは、図３（ａ）に示すように枝管
５ｂの端部近傍に形成されたＥＧＲ室１５内に充満して
いく。そして、吸気行程に入り吸気弁１７が開くことに
より、ＥＧＲ室１５内及びその近辺に充満しているＥＧ
Ｒガスは、図３（ｂ）に示すように負圧の作用によって
気筒２Ａ内に吸入されていく。このとき吸入されるＥＧ
Ｒガスの量は、容積の大きいＥＧＲ室１５内に蓄えられ
ていた分だけＥＧＲ室１５の無い従来のＥＧＲ装置（図
５参照）よりも増大する。そして、ＥＧＲ室１５内に予
め充満していたＥＧＲガスが吸入された後は、図３
（ｃ）に示すようにピストン１８の下降に応じてＥＧＲ
分配管１４から吸気通路３にＥＧＲガスが導入され、新
気とともに気筒２Ａ内に吸入される。With the above configuration, according to the EGR device as one embodiment of the present invention, the EGR gas ejected from the EGR distribution pipe 14 due to the intake / exhaust pressure difference during a stroke other than the intake stroke is: As shown in FIG. 3A, the inside of the EGR chamber 15 formed near the end of the branch pipe 5b is filled. When the intake valve 17 is opened in the intake stroke, the EG filling the EGR chamber 15 and its vicinity is filled.
The R gas is sucked into the cylinder 2A by the action of the negative pressure as shown in FIG. EG sucked at this time
The amount of R gas is larger than that of the conventional EGR device without the EGR chamber 15 (see FIG. 5) by the amount stored in the EGR chamber 15 having a large volume. After the EGR gas previously filled in the EGR chamber 15 is sucked, FIG.
As shown in (c), the EGR is performed in response to the lowering of the piston 18.
EGR gas is introduced into the intake passage 3 from the distribution pipe 14, and is sucked into the cylinder 2A together with fresh air.
【００１８】このように、本ＥＧＲ装置によれば、枝管
５ｂの端部近傍にＥＧＲ室１５が形成されることによ
り、吸気行程以外の行程中にＥＧＲ分配管１４から噴出
したＥＧＲガスを多量に蓄えておくことができるので、
吸気弁１７が開いた直後に吸入されるＥＧＲガスの初期
吸入量を増大させることができる。従って、ＥＧＲ率を
増大させることができ、燃焼温度を低下させてＮＯｘの
発生量を低減させることができるという効果がある。ま
た、各気筒２Ａ〜２ＤへのＥＧＲガスの導入量の増大に
よりＥＧＲ率の分配のばらつきが低減されるので、燃焼
騒音や振動の発生をより改善することができるという効
果もある。As described above, according to the present EGR apparatus, since the EGR chamber 15 is formed near the end of the branch pipe 5b, a large amount of EGR gas ejected from the EGR distribution pipe 14 during a stroke other than the intake stroke. Can be stored in
It is possible to increase the initial intake amount of the EGR gas that is taken immediately after the intake valve 17 is opened. Therefore, there is an effect that the EGR rate can be increased, the combustion temperature can be reduced, and the generation amount of NOx can be reduced. In addition, since the distribution of the EGR rate is reduced by increasing the amount of the EGR gas introduced into each of the cylinders 2A to 2D, there is an effect that the generation of combustion noise and vibration can be further improved.
【００１９】以上、本発明のＥＧＲ装置の一実施形態に
ついて説明したが、本発明は実施形態のものに限定され
るものではなく、本発明の趣旨を逸脱しない範囲で種々
の変形が可能である。また、本発明のＥＧＲ装置は、上
述の実施形態のようなディーゼルエンジンのみならず、
ガソリンエンジンにも適用できることは言うまでもな
い。Although the embodiment of the EGR device of the present invention has been described above, the present invention is not limited to the embodiment, and various modifications can be made without departing from the gist of the present invention. . Further, the EGR device of the present invention is not limited to the diesel engine as in the above-described embodiment,
It goes without saying that it can be applied to gasoline engines.
【００２０】[0020]
【発明の効果】以上詳述したように、本発明のＥＧＲ装
置によれば、吸気行程以外の行程中にＥＧＲ分配管から
噴出したＥＧＲガスをＥＧＲ室内に蓄えておくことがで
きるので、吸気弁が開いた直後のＥＧＲガスの初期吸入
量を増大させてＥＧＲ率を増大させることができ、燃焼
温度を低下させてＮＯｘの発生量を低減させることがで
きるという効果がある。As described above in detail, according to the EGR device of the present invention, the EGR gas ejected from the EGR pipe during the stroke other than the intake stroke can be stored in the EGR chamber. The EGR rate can be increased by increasing the initial intake amount of the EGR gas immediately after the valve is opened, and there is an effect that the combustion temperature can be reduced and the generation amount of NOx can be reduced.
【図１】本発明の一実施形態としてのＥＧＲ装置を備え
たディーゼルエンジンの概略図である。FIG. 1 is a schematic diagram of a diesel engine provided with an EGR device as one embodiment of the present invention.
【図２】本発明の一実施形態としてのＥＧＲ装置の要部
構成を示す模式的な断面図である。FIG. 2 is a schematic cross-sectional view illustrating a main configuration of an EGR device as one embodiment of the present invention.
【図３】本発明の一実施形態としてのＥＧＲ装置の作用
を説明するための説明図であり、（ａ）〜（ｃ）の順で
ＥＧＲガスが気筒内に吸入される様子を示している。FIG. 3 is an explanatory diagram for explaining an operation of the EGR device as one embodiment of the present invention, and shows a state in which EGR gas is sucked into a cylinder in the order of (a) to (c). .
【図４】従来の一般的なＥＧＲ装置を備えたディーゼル
エンジンの概略図である。FIG. 4 is a schematic diagram of a diesel engine provided with a conventional general EGR device.
【図５】従来の一般的なＥＧＲ装置を備えたディーゼル
エンジンの概略図である。FIG. 5 is a schematic view of a diesel engine equipped with a conventional general EGR device.
【図６】図５に示す構成のＥＧＲ装置における各気筒内
のＥＧＲガスの量と新気の量の変化を示す図である。6 is a diagram showing changes in the amount of EGR gas and the amount of fresh air in each cylinder in the EGR device having the configuration shown in FIG.
１ シリンダヘッド ２Ａ〜２Ｄ 気筒 ３ 吸気通路 ４ 排気通路 ５ 吸気マニホールド ５ａ 集合管 ５ｂ 枝管 ６ 排気マニホールド １１ ＥＧＲ管（ＥＧＲ通路） １４ ＥＧＲ分配管 １５ ＥＧＲ室 ２０ ＥＧＲ装置 DESCRIPTION OF SYMBOLS 1 Cylinder head 2A-2D cylinder 3 Intake passage 4 Exhaust passage 5 Intake manifold 5a Collecting pipe 5b Branch pipe 6 Exhaust manifold 11 EGR pipe (EGR passage) 14 EGR distribution pipe 15 EGR chamber 20 EGR device
Claims (1)
するＥＧＲ通路と、 該ＥＧＲ通路の下流側に設けられ各気筒に対応して分岐
したＥＧＲ分配管と、 各気筒に対応する枝管を有し、該枝管の端部がシリンダ
ヘッドに取り付けられる吸気マニホルドと、 該枝管の端部近傍に設けられ該ＥＧＲ分配管と該枝管と
を接続するＥＧＲ室とを備えたことを特徴とする、ＥＧ
Ｒ装置。1. An EGR passage communicating an exhaust passage and an intake passage of an engine, an EGR distribution pipe provided downstream of the EGR passage and branching corresponding to each cylinder, and a branch pipe corresponding to each cylinder. An intake manifold in which an end of the branch pipe is attached to a cylinder head; and an EGR chamber provided near an end of the branch pipe and connecting the EGR distribution pipe and the branch pipe. EG
R device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273282A JP2002089376A (en) | 2000-09-08 | 2000-09-08 | Egr device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000273282A JP2002089376A (en) | 2000-09-08 | 2000-09-08 | Egr device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002089376A true JP2002089376A (en) | 2002-03-27 |
Family
ID=18759254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000273282A Pending JP2002089376A (en) | 2000-09-08 | 2000-09-08 | Egr device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002089376A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2383605A (en) * | 2001-12-28 | 2003-07-02 | Visteon Global Tech Inc | Introducing EGR gas into i.c. engine inlet manifold |
| DE102011013029A1 (en) | 2010-03-15 | 2011-09-15 | Denso Corporation | Exhaust gas recirculation device for combustion engine, comprises turbocharger, which is set in inlet system for sucking air under pressure, and intercooler for cooling intake air by heat exchange with coolant circulated through intercooler |
| CN106150769A (en) * | 2015-03-27 | 2016-11-23 | 长城汽车股份有限公司 | Engine pack and there is its vehicle |
| JP2017141689A (en) * | 2016-02-08 | 2017-08-17 | 株式会社Ｓｕｂａｒｕ | Gas recirculation device |
| JP2020125760A (en) * | 2020-05-29 | 2020-08-20 | ダイハツ工業株式会社 | Intake manifold integrated with surge tank |
-
2000
- 2000-09-08 JP JP2000273282A patent/JP2002089376A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2383605A (en) * | 2001-12-28 | 2003-07-02 | Visteon Global Tech Inc | Introducing EGR gas into i.c. engine inlet manifold |
| US6691686B2 (en) | 2001-12-28 | 2004-02-17 | Visteon Global Technologies, Inc. | Intake manifold with improved exhaust gas recirculation |
| GB2383605B (en) * | 2001-12-28 | 2004-05-05 | Visteon Global Tech Inc | Intake manifold with improved exhaust gas recirculation |
| DE102011013029A1 (en) | 2010-03-15 | 2011-09-15 | Denso Corporation | Exhaust gas recirculation device for combustion engine, comprises turbocharger, which is set in inlet system for sucking air under pressure, and intercooler for cooling intake air by heat exchange with coolant circulated through intercooler |
| CN106150769A (en) * | 2015-03-27 | 2016-11-23 | 长城汽车股份有限公司 | Engine pack and there is its vehicle |
| JP2017141689A (en) * | 2016-02-08 | 2017-08-17 | 株式会社Ｓｕｂａｒｕ | Gas recirculation device |
| JP2020125760A (en) * | 2020-05-29 | 2020-08-20 | ダイハツ工業株式会社 | Intake manifold integrated with surge tank |
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