JP2002021646A - Exhaust gas recirculation device - Google Patents

Exhaust gas recirculation device

Info

Publication number
JP2002021646A
JP2002021646A JP2000202369A JP2000202369A JP2002021646A JP 2002021646 A JP2002021646 A JP 2002021646A JP 2000202369 A JP2000202369 A JP 2000202369A JP 2000202369 A JP2000202369 A JP 2000202369A JP 2002021646 A JP2002021646 A JP 2002021646A
Authority
JP
Japan
Prior art keywords
egr
valve
passage
exhaust gas
pressure
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
JP2000202369A
Other languages
Japanese (ja)
Inventor
Yoshiaki Moroguchi
慶明 諸口
Shigeru Matsuo
松尾　　繁
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.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
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 Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP2000202369A priority Critical patent/JP2002021646A/en
Publication of JP2002021646A publication Critical patent/JP2002021646A/en
Pending legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust gas recirculation device with high responsiveness provided in an exhaust gas recirculation gas passage, operated by a very small pressure difference between an exhaust pressure and an intake pressure, and capable of coping with a large flow rate of exhaust gas recirculation gas. SOLUTION: This exhaust gas recirculation device is composed of an exhaust gas recirculation passage 5 feeding the exhaust gas recirculation gas from an exhaust passage of an engine to an intake passage, an exhaust gas recirculation valve 3 interposed in the exhaust gas recirculation passage 5 and capable of adjusting a flow rate of the exhaust gas recirculation gas of the exhaust gas recirculation passage 5, and a pressure responsive valve 4 interposed in the exhaust gas recirculation passage 5, composed of a valve member 14, a seat member 11, and a spring member 15 pressing and energizing the valve member 14 against the seat member 11 so as to allow only a flow of the exhaust gas recirculation gas from a exhaust passage 5 side to an intake passage side, and set so as to allow the valve member 14 to abut on the set member 11 by a free length of the spring member 15.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、ＥＧＲ装置に関す
る。[0001] The present invention relates to an EGR device.

【０００２】[0002]

【従来の技術】排気ガス中のＮＯｘは、混合気が燃焼す
る際高温度によって混合気中の窒素と酸素とが結合され
て生成される。従って、燃焼温度を下げることによりＮ
Ｏｘを低減することができる。排気ガス中のＮＯｘを低
減させる方法の一つとして、排気ガス再循環（Exhaust
Gas Recirculation）装置（以下「ＥＧＲ装置」とい
う）がある。2. Description of the Related Art NOx in exhaust gas is generated when nitrogen and oxygen in the air-fuel mixture are combined at a high temperature when the air-fuel mixture burns. Therefore, by lowering the combustion temperature, N
Ox can be reduced. As one of the methods for reducing NOx in exhaust gas, exhaust gas recirculation (Exhaust
There is a Gas Recirculation (hereinafter referred to as "EGR") device.

【０００３】ＥＧＲ装置は、燃焼済みの排気ガスの一部
を吸入側に導入させることにより燃焼を緩慢にして最高
燃焼温度を下げてＮＯｘの発生を低減させるようにした
もので、エンジンの排気通路と吸気通路とをＥＧＲ通路
で接続し、このＥＧＲ通路に排気ガス流量を調節可能に
ＥＧＲ弁を介装し、エンジンの運転状態に応じてＥＧＲ
弁を制御して吸気側への排気ガス（以下「ＥＧＲガス」
という）の還流量を制御するように構成されている。[0003] The EGR system is designed to slow the combustion by introducing a part of the burned exhaust gas to the intake side to lower the maximum combustion temperature and reduce the generation of NOx. And an intake passage are connected by an EGR passage, and an EGR valve is interposed in the EGR passage so as to adjust an exhaust gas flow rate.
Exhaust gas to the intake side by controlling the valve (hereinafter referred to as “EGR gas”)
) Is controlled.

【０００４】ところで、エンジンの排気圧及び吸気圧
は、圧力が変動する脈動波であり、従って、ＥＧＲ通路
を流れるＥＧＲガスも排気通路と吸気通路の圧力変動の
影響を受けて脈動することとなる。このため、吸気圧が
排気圧よりも高いときには、ＥＧＲガス通路内のＥＧＲ
ガスが逆流してしまい、吸気通路にＥＧＲガスを充分に
還流することが困難な要因の一つとされている。The exhaust pressure and the intake pressure of the engine are pulsating waves whose pressure fluctuates. Therefore, the EGR gas flowing through the EGR passage also pulsates under the influence of the pressure fluctuation in the exhaust passage and the intake passage. . Therefore, when the intake pressure is higher than the exhaust pressure, the EGR in the EGR gas passage
This is considered to be one of the factors that make it difficult for the gas to flow back and to sufficiently recirculate the EGR gas to the intake passage.

【０００５】そこで、ＥＧＲガス通路と吸気通路との接
合部にリードバルブを設け、排気通路の脈動圧が吸気通
路の脈動圧よりも高いときにのみＥＧＲ通路から吸気通
路へのＥＧＲガスの流れを許容してＥＧＲガスの還流量
を確保するようにした排気還流装置が開示されている
（実開平６−４０３４３）。Therefore, a reed valve is provided at the junction between the EGR gas passage and the intake passage, and the flow of the EGR gas from the EGR passage to the intake passage is restricted only when the pulsation pressure of the exhaust passage is higher than the pulsation pressure of the intake passage. An exhaust gas recirculation device is disclosed which permits the amount of EGR gas to be recirculated (Japanese Utility Model Laid-Open No. 6-40343).

【０００６】[0006]

【発明が解決しようとする課題】しかしながら、上記リ
ードバルブを備えた排気還流装置においては、リードバ
ルブの構造上、耐久性を確保するためにリードのストロ
ーク量（開弁量）が制限され、開口面積が小さくなる。
従って、必要な開口面積を確保するためにはリードバル
ブを多数並設することが必要となり、これに伴い形状が
大きくなり搭載スペースが大幅に制約されると共に、コ
ストが高くなる。更に、リードの付け根部分に煤等が付
着して固化すると確実に閉弁することができなくなるば
かりでなく、閉弁するときに固化した部分に応力集中が
起こり、リードが破損し易くなる。従って、リードを多
数並設した構造においては、それだけ故障個所が多くな
る。耐久性を向上させるためにリードの板厚を厚くする
と開弁（開口）圧が高くなり、その分ＥＧＲガスの還流
量が少なくなるという問題がある。However, in the exhaust gas recirculation apparatus provided with the above-described reed valve, the amount of reed stroke (valve opening amount) is limited due to the structure of the reed valve in order to ensure durability. The area becomes smaller.
Therefore, in order to secure a necessary opening area, it is necessary to arrange a large number of reed valves side by side, and accordingly, the shape becomes large, the mounting space is greatly restricted, and the cost increases. Furthermore, if soot or the like adheres to the root portion of the lead and solidifies, not only the valve cannot be reliably closed, but also stress concentration occurs in the solidified portion when the valve is closed, and the lead is easily broken. Therefore, in a structure in which a large number of leads are arranged in parallel, the number of failure points increases accordingly. When the thickness of the lead is increased in order to improve the durability, the valve opening (opening) pressure increases, and there is a problem that the recirculation amount of the EGR gas decreases accordingly.

【０００７】このため、本発明では、ＥＧＲガス通路に
設けられ、排気圧と吸気圧との微小な圧力差で作動し、
応答性が高く、且つ大流量のＥＧＲガスに対応すること
が可能なＥＧＲ装置を提供することを目的としている。For this reason, according to the present invention, provided in the EGR gas passage, it operates with a small pressure difference between the exhaust pressure and the intake pressure,
It is an object of the present invention to provide an EGR device having high responsiveness and capable of handling a large amount of EGR gas.

【０００８】[0008]

【課題を解決するための手段】上記目的を達成するた
め、本発明では、エンジンの排気ガスの一部がＥＧＲガ
スとしてＥＧＲ通路に介装されたＥＧＲ装置に流入し、
当該ＥＧＲ装置のＥＧＲ通路に介装されているＥＧＲガ
スの流量を調節可能なＥＧＲ弁と、排気通路側から吸気
通路側へのＥＧＲガスの流れのみを許容するように、弁
部材をシート部材にバネ部材の自由長により当接するよ
うに設定された圧力応動弁とを通して吸気通路に供給さ
れる。ＥＧＲ弁は、エンジンの運転状態に応じて開弁量
が制御されてＥＧＲガスの流量を調節する。圧力応動弁
は、僅かな圧力差で開閉して、ＥＧＲガスの流れを制御
する。即ち、圧力応動弁は、排気通路の圧力が吸気通路
の圧力よりも僅かに高くなると開弁し、排気通路の圧力
が吸気通路の圧力よりも僅かでも低くなると閉弁する。
これにより、圧力応動弁は、応答性が高くなり、ＥＧＲ
通路内のＥＧＲガスの逆流を良好に防止することがで
き、これによりＥＧＲ率が増大してＮＯｘの低減が図ら
れる。In order to achieve the above object, according to the present invention, a part of exhaust gas of an engine flows into an EGR device provided in an EGR passage as EGR gas,
An EGR valve that is capable of adjusting the flow rate of EGR gas interposed in the EGR passage of the EGR device, and a valve member is attached to a seat member so as to allow only the flow of the EGR gas from the exhaust passage side to the intake passage side. The pressure is supplied to the intake passage through a pressure-responsive valve set to be in contact with the free length of the spring member. The amount of opening of the EGR valve is controlled in accordance with the operating state of the engine to adjust the flow rate of EGR gas. The pressure responsive valve opens and closes with a slight pressure difference to control the flow of EGR gas. That is, the pressure responsive valve opens when the pressure in the exhaust passage becomes slightly higher than the pressure in the intake passage, and closes when the pressure in the exhaust passage becomes slightly lower than the pressure in the intake passage.
As a result, the responsiveness of the pressure responsive valve increases, and the EGR
The backflow of the EGR gas in the passage can be satisfactorily prevented, thereby increasing the EGR rate and reducing NOx.

【０００９】また、ＥＧＲ弁のシート部開口面積と圧力
応動弁のシート部開口面積とを略同一としたことで、Ｅ
ＧＲ弁を通るＥＧＲガス流量と略同量のＥＧＲガスが圧
力応動弁を通って吸気通路側に供給される。これによ
り、ＥＧＲガスの高流量化が図られる。また、ＥＧＲ弁
と圧力応動弁とを一体に構成することで、構造の簡素
化、小型化、コストの低減化が図られる。[0009] Further, since the opening area of the seat of the EGR valve and the opening area of the seat of the pressure-responsive valve are substantially the same, E
EGR gas of substantially the same amount as the flow rate of EGR gas passing through the GR valve is supplied to the intake passage through the pressure responsive valve. As a result, the flow rate of the EGR gas is increased. Further, by integrally forming the EGR valve and the pressure responsive valve, the structure can be simplified, downsized, and the cost can be reduced.

【００１０】[0010]

【発明の実施の形態】以下、図面を参照して本発明の好
適な実施例を例示的に詳しく説明する。図１は、本発明
に係るＥＧＲ装置の断面図である。図に示すようにＥＧ
Ｒ装置１は、ハウジング２にＥＧＲ弁３と圧力応動弁４
とが一体に収納されて構成されている。ハウジング２に
はＥＧＲ通路５が設けられている。このＥＧＲ通路５
は、上部５ａが略四分円状に湾曲する円筒形をなし、下
部５ｂが上部５ａよりも僅かに大径の円筒形をなしてお
り、上端が一側上部に開口してＥＧＲガスの入口５ｃと
され、下端が他側下部に開口してＥＧＲガスの出口５ｄ
とされ、上部５ａと下部５ｂとの段差部５ｅがＥＧＲ弁
３の弁座（以下「弁座５ｅ」という）とされている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. FIG. 1 is a sectional view of an EGR device according to the present invention. As shown in the figure, EG
The R device 1 includes an EGR valve 3 and a pressure-responsive valve 4
And are housed integrally. An EGR passage 5 is provided in the housing 2. This EGR passage 5
The upper part 5a has a cylindrical shape curved substantially in a quadrant, the lower part 5b has a cylindrical shape slightly larger in diameter than the upper part 5a, the upper end is open at one side upper part, and the EGR gas inlet is formed. 5c, the lower end of which is open to the lower part on the other side, and the outlet 5d of the EGR gas.
The step 5e between the upper part 5a and the lower part 5b is a valve seat of the EGR valve 3 (hereinafter, referred to as "valve seat 5e").

【００１１】ＥＧＲ弁３の弁部材７は、例えば、ポペッ
トバルブで、弁棒８の上部がハウジング２の上部に穿設
された孔２ａを貫通して上方に延出し、下部がＥＧＲ通
路５の上部５ａの湾曲部分を遊貫して下部５ｂとの連通
部の中央に位置し、下端に弁体９が固定されている。こ
の弁体９は、周縁部が弁座５ｅに当接可能とされて通路
５を開閉する。弁棒８は、孔２ａを軸方向に気密に摺動
可能とされ、上端がソレノイド等の駆動機構（図示せ
ず）に連結される。ＥＧＲ弁３は、エンジンの運転状態
に応じて前記駆動機構により弁棒８が駆動されて開閉制
御される。The valve member 7 of the EGR valve 3 is, for example, a poppet valve. The upper part of the valve rod 8 extends upward through a hole 2a formed in the upper part of the housing 2, and the lower part of the EGR passage 5 The valve body 9 is fixed to the lower end at the center of the communicating part with the lower part 5b through the curved part of the upper part 5a. The valve element 9 is configured such that a peripheral portion thereof can contact the valve seat 5e to open and close the passage 5. The valve stem 8 is slidable in the hole 2a in the axial direction in an airtight manner, and has an upper end connected to a drive mechanism (not shown) such as a solenoid. The EGR valve 3 is controlled to open and close by driving the valve rod 8 by the drive mechanism according to the operating state of the engine.

【００１２】圧力応動弁４は、ＥＧＲ弁３の下方に配置
されている。弁座としてのシート部材１１は、環状をな
し、ＥＧＲ通路５の下部５ｂの略中央に配置され、外周
面が下部５ｂの内周面に気密に固定されている。このシ
ート部材１１の孔１１ａは、通路５の上部５ａと略同径
即ち、略同じ開口面積とされている。弁部材１２は、例
えば、ポペットバルブで、弁棒１３の下部がハウジング
２の底部に穿設された孔２ｂを貫通して下方に突出し、
ストッパ１３ａにより逸脱不能とされ、上部がＥＧＲ通
路５の下部５ｂの中央を遊貫し、上端に弁体１４が固定
されている。この弁体１４は、周縁部がシート部材１１
の孔１１ａの下面周縁部に当接可能とされて孔１１ａを
開閉する。弁棒１３は、孔２ｂを気密に軸方向に摺動可
能とされている。The pressure responsive valve 4 is disposed below the EGR valve 3. The seat member 11 as a valve seat has an annular shape, is disposed substantially at the center of the lower portion 5b of the EGR passage 5, and has an outer peripheral surface hermetically fixed to an inner peripheral surface of the lower portion 5b. The hole 11a of the sheet member 11 has substantially the same diameter as the upper portion 5a of the passage 5, that is, the opening area is substantially the same. The valve member 12 is, for example, a poppet valve, in which a lower portion of the valve rod 13 projects downward through a hole 2b formed in the bottom of the housing 2,
The stopper 13a makes it impossible to deviate, the upper part of the EGR passage 5 passes through the center of the lower part 5b, and the valve body 14 is fixed to the upper end. The valve body 14 has a peripheral portion that is the seat member 11.
And can open and close the hole 11a. The valve stem 13 is slidably and axially slidable in the hole 2b.

【００１３】バネ部材としてのスプリグ１５は、ＥＧＲ
通路５の下部５ｂの端面５ｆと弁体１４の下面との間に
縮設されている。スプリング１５は、その自由長が端面
５ｆと弁体１４の下面との間の間隔よりも僅かに長い程
度とされており、弁体１４をシート部材１１に極めて微
小な押圧力で当接させている。即ち、スプリング１５
は、弁体１４をその自重とバランスする（自重をキャン
セルする）ばね力でフローティング支持してシート部材
１１に当接させている。これにより、圧力応動弁４は、
ＥＧＲ通路５の上部５ａ側の圧力Ｐｇと下部５ｂ側の圧
力Ｐｂとの僅かな圧力差ΔＰ（＝Ｐｇ−Ｐｂ）で開閉可
能とされる。The spring 15 as a spring member is made of EGR.
It is contracted between the end surface 5f of the lower portion 5b of the passage 5 and the lower surface of the valve element 14. The spring 15 has a free length that is slightly longer than the distance between the end face 5f and the lower surface of the valve body 14, and makes the valve body 14 come into contact with the seat member 11 with an extremely small pressing force. I have. That is, the spring 15
, The valve body 14 is floatingly supported by a spring force that balances the own weight (cancels its own weight) and is brought into contact with the seat member 11. As a result, the pressure-responsive valve 4
The EGR passage 5 can be opened and closed with a slight pressure difference ΔP (= Pg−Pb) between the pressure Pg on the upper portion 5a side and the pressure Pb on the lower portion 5b side.

【００１４】このＥＧＲ装置１は、図示のように圧力応
動弁４が上下方向に向いて配置されてエンジンの排気通
路と吸気通路とを接続するＥＧＲ通路（何れも図示せ
ず）に介装され、ＥＧＲ通路５の入口５ｃが前記排気通
路側に接続され、出口５ｄが前記吸気通路側に接続され
る。以下に作用を説明する。In the EGR device 1, as shown, a pressure responsive valve 4 is arranged in a vertical direction, and is interposed in an EGR passage (both not shown) connecting an exhaust passage and an intake passage of an engine. , EGR passage 5 has an inlet 5c connected to the exhaust passage, and an outlet 5d connected to the intake passage. The operation will be described below.

【００１５】エンジンの排気通路に排出された排気ガス
の一部は、ＥＧＲガスとしてＥＧＲ装置１のＥＧＲ通路
５の入口５ｃから流入する。この流入したＥＧＲガス
は、エンジンの運転状態に応じて開弁されているＥＧＲ
弁３を通してＥＧＲ通路５の下部５ｂに流入する。この
とき、前記排気通路の圧力Ｐｇが吸気通路の圧力Ｐｂよ
りも高い（Ｐｇ＞Ｐｂ）ときには、前記ＥＧＲガスがス
プリング１５のばね力に抗して弁体１４を押し下げて圧
力応動弁４を開弁し、出口５ｄから前記吸気通路へと流
れる。A part of the exhaust gas discharged into the exhaust passage of the engine flows as the EGR gas from the inlet 5c of the EGR passage 5 of the EGR device 1. The inflowing EGR gas is supplied to the EGR valve which is opened according to the operating state of the engine.
It flows into the lower part 5b of the EGR passage 5 through the valve 3. At this time, when the pressure Pg in the exhaust passage is higher than the pressure Pb in the intake passage (Pg> Pb), the EGR gas pushes down the valve body 14 against the spring force of the spring 15 to open the pressure responsive valve 4. The valve then flows from the outlet 5d to the intake passage.

【００１６】圧力応動弁４は、スプリング１５が 弁体
１４をフローティング支持してシート部材１１に僅かな
ばね力で当接させて閉弁状態を保持しているために微小
な圧力差で開閉動作し、排気通路の圧力Ｐｇが吸気通路
の圧力Ｐｂよりも僅かに高いときには開弁して排気通路
側から吸気通路側へのＥＧＲガスの流を許容し、排気通
路の圧力Ｐｇが吸気通路の圧力Ｐｂよりも僅かでも低く
なると閉弁して、前記吸気通路側から排気通路側へのＥ
ＧＲガスの逆流を阻止する。また、圧力応動弁４のシー
ト部材１１の孔１１ａは、ＥＧＲ弁３の開口部即ち、Ｅ
ＧＲ通路５の上部５ａと略同じ開口面積とされているた
めにＥＧＲガスの高流量化が図られ、充分なＥＧＲガス
流量を確保することができる。The pressure responsive valve 4 is opened and closed by a small pressure difference because the spring 15 supports the valve body 14 in a floating state and makes contact with the seat member 11 with a slight spring force to maintain the valve closed state. When the pressure Pg in the exhaust passage is slightly higher than the pressure Pb in the intake passage, the valve is opened to allow the flow of the EGR gas from the exhaust passage side to the intake passage side, and the pressure Pg in the exhaust passage becomes the pressure in the intake passage. When the pressure becomes slightly lower than Pb, the valve is closed and E from the intake passage side to the exhaust passage side is closed.
The backflow of GR gas is prevented. Further, the hole 11a of the seat member 11 of the pressure responsive valve 4 corresponds to the opening of the EGR valve 3, that is, E
Since the opening area is substantially the same as that of the upper portion 5a of the GR passage 5, the flow rate of the EGR gas is increased, and a sufficient flow rate of the EGR gas can be secured.

【００１７】これにより、ＥＧＲ装置１は、ＥＧＲガス
を効率よく、しかも、高い応答性をもって吸気通路側に
環流することが可能となり、ＥＧＲ率が増大し、ＮＯｘ
の低減が図られる。また、過渡時等において吸気圧（Ｐ
ｂ）が急に上昇した場合、吸気がＥＧＲ通路５を通して
排気通路に漏れることが防止され、吸気の体積効率の増
大が図られる。また、圧力応動弁４は、微小な圧力差で
ＥＧＲガスの逆流を防止することができるために、ＥＧ
Ｒ付加限界を拡大する（エンジン高負荷運転領域までＥ
ＧＲガスを還流させる）ことが可能となる。As a result, the EGR device 1 can efficiently recirculate the EGR gas to the intake passage with high responsiveness, the EGR rate increases, and the NOx
Is reduced. Also, at the time of transition or the like, the intake pressure (P
When b) rises sharply, the intake air is prevented from leaking to the exhaust passage through the EGR passage 5, and the volumetric efficiency of the intake air is increased. Further, since the pressure-responsive valve 4 can prevent the backflow of the EGR gas with a small pressure difference,
Expand the R addition limit (E to engine high load operation range
(GR gas is refluxed).

【００１８】圧力応動弁４は、ポペットタイプの弁体１
４とスプリング１５とにより構成され、且つ構造が簡単
であるために破損するおそれがなく耐久性が向上する。
更に、ＥＧＲ装置１は、ＥＧＲガスの体積効率を向上さ
せるために図示しないＥＧＲクーラにより冷却される構
成とされており、このＥＧＲ装置１内に圧力応動弁４を
一体に組み込む構成としたことで冷却され、温度条件が
大幅に緩和される。これにより、圧力応動弁４の耐久性
が更に向上する。更に、１つの圧力応動弁４で充分なＥ
ＧＲガス流量を確保することができ、構造の簡素化と相
俟ってコストの低減が図られる。The pressure responsive valve 4 is a poppet type valve element 1.
4 and the spring 15, and since the structure is simple, there is no possibility of breakage and the durability is improved.
Further, the EGR device 1 is configured to be cooled by an EGR cooler (not shown) in order to improve the volumetric efficiency of the EGR gas, and the pressure responsive valve 4 is integrally incorporated in the EGR device 1. Cooling and temperature conditions are greatly relaxed. Thereby, the durability of the pressure responsive valve 4 is further improved. Further, one pressure-responsive valve 4 is sufficient for E
The GR gas flow rate can be secured, and the cost can be reduced in combination with the simplification of the structure.

【００１９】[0019]

【発明の効果】以上説明したように請求項１の発明で
は、ＥＧＲ装置を、エンジンの排気通路から吸気通路に
ＥＧＲガスを供給するＥＧＲ通路に介装されて該ＥＧＲ
通路のＥＧＲガスの流量を調節可能なＥＧＲ弁と、前記
排気通路側から吸気通路側へのＥＧＲガスの流れのみを
許容し、且つ微小な圧力差で作動する圧力応動弁とによ
り構成することで、排気圧と吸気圧との圧力差によるＥ
ＧＲ通路内のＥＧＲガスの逆流を防止することができ、
且つ高応答化が可能となり、ＥＧＲ率の増大が図られ、
この結果、ＮＯｘの低減が図られ、同一のＮＯｘの排出
レベルとした場合には、燃費の低減が図られる。As described above, according to the first aspect of the present invention, the EGR device is interposed in the EGR passage that supplies EGR gas from the exhaust passage of the engine to the intake passage, and
An EGR valve capable of adjusting the flow rate of EGR gas in the passage, and a pressure responsive valve that permits only the flow of EGR gas from the exhaust passage side to the intake passage side and operates with a small pressure difference. E due to the pressure difference between exhaust pressure and intake pressure
The back flow of the EGR gas in the GR passage can be prevented,
In addition, high response is possible, and the EGR rate is increased,
As a result, NOx is reduced, and when the same NOx emission level is set, fuel efficiency is reduced.

【００２０】請求項２の発明では、ＥＧＲ弁のシート部
開口面積と圧力応動弁のシート部開口面積とを略同一と
したことで、高流量化が図られ、ＥＧＲ率の増大が図ら
れ、ＮＯｘの低減が図られる。また、１つの圧力応動弁
で対応することが可能となり、構造が簡単となると共
に、コストの低減が図られる。請求項３では、ＥＧＲ弁
と圧力応動弁とを一体に構成したことで、構造の簡素化
が図られると共にコストの低減が図られる。更に、ＥＧ
Ｒ装置を冷却する場合に圧力応動弁も冷却されるために
耐久性の更なる向上が図られる。According to the second aspect of the present invention, the flow rate can be increased and the EGR rate can be increased by making the seat opening area of the EGR valve and the seat opening area of the pressure responsive valve substantially the same. NOx is reduced. Further, it is possible to cope with one pressure-responsive valve, so that the structure is simplified and the cost is reduced. In the third aspect, the EGR valve and the pressure responsive valve are integrally formed, so that the structure is simplified and the cost is reduced. Further, EG
When the R device is cooled, the pressure responsive valve is also cooled, so that the durability is further improved.

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

【図１】本発明に係るＥＧＲ装置の断面図である。FIG. 1 is a sectional view of an EGR device according to the present invention.

【符号の説明】[Explanation of symbols]

１ ＥＧＲ装置 ２ ハウジング ３ ＥＧＲ弁 ４ 圧力応動弁 ５ ＥＧＲ通路 ７ 弁部材 １１ シート部材 １２ 弁部材 １３ 弁棒 １４ 弁体 １５ スプリング DESCRIPTION OF SYMBOLS 1 EGR apparatus 2 Housing 3 EGR valve 4 Pressure responsive valve 5 EGR passage 7 Valve member 11 Seat member 12 Valve member 13 Valve rod 14 Valve body 15 Spring

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 エンジンの排気通路から吸気通路にＥＧ
Ｒガスを供給するＥＧＲ通路と、 前記ＥＧＲ通路に介装され該ＥＧＲ通路のＥＧＲガスの
流量を調節可能なＥＧＲ弁と、 前記ＥＧＲ通路に介装され、前記排気通路側から吸気通
路側へのＥＧＲガスの流れのみを許容するように、弁部
材と、シート部材及び前記弁部材を前記シート部材に押
圧付勢するバネ部材とにより構成され、前記バネ部材の
自由長により前記弁部材を前記シート部材に当接するよ
うに設定された圧力応動弁とにより構成されていること
を特徴とするＥＧＲ装置。An EG is provided from an exhaust passage of an engine to an intake passage.
An EGR passage for supplying R gas, an EGR valve interposed in the EGR passage and capable of adjusting a flow rate of EGR gas in the EGR passage, an EGR valve interposed in the EGR passage, and A valve member, a seat member and a spring member for pressing and urging the valve member against the seat member so as to allow only the flow of the EGR gas. An EGR device, comprising: a pressure responsive valve set so as to come into contact with a member. 【請求項２】 請求項１のＥＧＲ装置において、ＥＧＲ
弁のシート部開口面積と圧力応動弁のシート部開口面積
とを略同一としたことを特徴とするＥＧＲ装置。2. The EGR device according to claim 1, wherein
An EGR device wherein the valve seat opening area and the pressure responsive valve seat opening area are substantially the same. 【請求項３】 請求項１のＥＧＲ装置において、ＥＧＲ
弁と圧力応動弁とを一体に構成したことを特徴とするＥ
ＧＲ装置。3. The EGR device according to claim 1, wherein
E wherein the valve and the pressure responsive valve are integrally formed.
GR device.
JP2000202369A 2000-07-04 2000-07-04 Exhaust gas recirculation device Pending JP2002021646A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000202369A JP2002021646A (en) 2000-07-04 2000-07-04 Exhaust gas recirculation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000202369A JP2002021646A (en) 2000-07-04 2000-07-04 Exhaust gas recirculation device

Publications (1)

Publication Number Publication Date
JP2002021646A true JP2002021646A (en) 2002-01-23

Family

ID=18699902

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000202369A Pending JP2002021646A (en) 2000-07-04 2000-07-04 Exhaust gas recirculation device

Country Status (1)

Country Link
JP (1) JP2002021646A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012241650A (en) * 2011-05-20 2012-12-10 Daihatsu Motor Co Ltd Exhaust gas reflux device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012241650A (en) * 2011-05-20 2012-12-10 Daihatsu Motor Co Ltd Exhaust gas reflux device

Similar Documents

Publication Publication Date Title
US20070236083A1 (en) Negative pressure supply apparatus for brake booster
US20080190404A1 (en) Internal Combustion Engine Having Exhaust Gas Recirculation
EP0701053A3 (en) Exhaust gas recirculation valve
US20060037310A1 (en) Airflow control valve for use in an internal combustion engine
US3928966A (en) Flow control valve for exhaust gas recirculation system
KR20080039261A (en) Engine exhaust gas recirculation (egr) valve
JP2002021646A (en) Exhaust gas recirculation device
US5491976A (en) Vehicle emission air injection
US4450684A (en) Exhaust gas cleaning system for internal combustion engine
US5105620A (en) Secondary air supply system for supercharged engine
US6454238B1 (en) Valve
JPH11200959A (en) Egr valve structure
JP3714057B2 (en) EGR valve device
JP2001090617A (en) Egr valve
JPH108925A (en) Opening/closing valve structure for exhaust gas recycling device
JPH04255558A (en) Fluid controlling valve device
JPS582419A (en) Cooling-water control device for internal-combustion engine
JPS61167155A (en) Pressure regulator for internal-combustion engine
JPH018677Y2 (en)
JPH09217659A (en) Exhaust gas recirculating device
JPH05332203A (en) Exhaust gas reflux control valve for internal combustion engine
JP2003269262A (en) Exhaust gas recirculation system
JPS5917264B2 (en) Internal combustion engine exhaust gas recirculation device
JPH08121262A (en) Exhaust gas recirculation control valve
JPH0460162A (en) Electronically controlled carburetor

Legal Events

Date Code Title Description
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20060203

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20060208

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20060607