JPH07247911A - Exhaust gas reflux device of engine - Google Patents
Exhaust gas reflux device of engineInfo
- Publication number
- JPH07247911A JPH07247911A JP6064548A JP6454894A JPH07247911A JP H07247911 A JPH07247911 A JP H07247911A JP 6064548 A JP6064548 A JP 6064548A JP 6454894 A JP6454894 A JP 6454894A JP H07247911 A JPH07247911 A JP H07247911A
- Authority
- JP
- Japan
- Prior art keywords
- egr
- engine
- exhaust gas
- valve
- egr rate
- 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
- F02M26/52—Systems for actuating EGR valves
- F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
- F02M26/60—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor in response to air intake pressure
-
- 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
- F02M26/28—Layout, e.g. schematics with liquid-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
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
-
- 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
-
- 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
- F02M26/55—Systems for actuating EGR valves using vacuum actuators
- F02M26/56—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves
- F02M26/57—Systems for actuating EGR valves using vacuum actuators having pressure modulation valves using electronic means, e.g. electromagnetic valves
-
- 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
- F02B29/0437—Liquid 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
- F02M26/07—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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エンジンの排気ガス還
流装置に係わり、特には、排気ガスの一部を２個以上の
同じ形状のＥＧＲバルブを通過させて吸気側に還流させ
るエンジンの排気ガス還流装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine exhaust gas recirculation system, and more particularly to an engine exhaust system in which a portion of exhaust gas is passed through two or more EGR valves of the same shape and recirculated to the intake side. The present invention relates to a gas recirculation device.
【０００２】[0002]
【従来の技術】従来、自動車等に搭載されるエンジンに
おいて、排気ガス中のＮＯX （窒素酸化物）を低減する
ために、排気ガスの一部を吸気側に還流させる排気ガス
還流（以下、ＥＧＲという。）は、特開平４−１７５４
５３号公報で知られている。また、排気ガス還流通路に
大流量用ＥＧＲバルブと小流量用ＥＧＲバルブを並列に
配置し、大流量用バルブをダイアフラム装置で応答性を
良く開閉制御し、かつ、小流量用バルブをステッピング
モータで高精度に開閉制御するものは、特開平５−９９
０８１号公報で知られている。2. Description of the Related Art Conventionally, in an engine mounted on an automobile or the like, in order to reduce NOx (nitrogen oxide) in exhaust gas, exhaust gas recirculation (hereinafter referred to as EGR) in which a part of exhaust gas is recirculated to an intake side. Is described in Japanese Patent Application Laid-Open No. 4-1754.
It is known from Japanese Patent No. 53. Also, a large flow rate EGR valve and a small flow rate EGR valve are arranged in parallel in the exhaust gas recirculation passage, the large flow rate valve is controlled by a diaphragm device to open and close with good responsiveness, and the small flow rate valve is controlled by a stepping motor. A device for highly accurate opening / closing control is disclosed in Japanese Patent Laid-Open No. 5-99.
No. 081 is known.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、排気ガ
スの一部を吸気側に還流させる還流量は、エンジンの排
気量、あるいは、図６に示すようにエンジン回転速度お
よびエンジン負荷率により変わることが知られている。
しかし、現状では、大型のディーゼルエンジンではエン
ジンの排気量が大きく、それに対応する大流量用ＥＧＲ
バルブが存在しないという問題と、製作しても大流量用
ＥＧＲバルブであるが故に製作するためにはコストが高
くなるという問題がある。また、エンジンの排気ガス
は、排気圧力は一定の圧力でなく、また、排気流量に脈
動があるため、ＥＧＲバルブにこの変動する圧力がかか
るとともに、脈動流量が通過し、小流量用ＥＧＲバルブ
をステッピングモータで制御しても高精度に制御出来な
いという問題がある。さらに、高温の排気ガスをステッ
ピングモータを用いてＥＧＲバルブを制御するために、
耐熱性が必要となり構造が複雑になるという問題があ
る。However, the recirculation amount for recirculating a part of the exhaust gas to the intake side may vary depending on the engine exhaust amount, or the engine speed and the engine load factor as shown in FIG. Are known.
However, at present, a large diesel engine has a large engine displacement, which corresponds to a large flow rate EGR.
There is a problem that the valve does not exist, and even if it is manufactured, it is a large flow rate EGR valve, so that there is a problem that the cost is high for manufacturing. In addition, since the exhaust pressure of the engine is not a constant exhaust pressure and the exhaust flow rate has a pulsation, the fluctuating pressure is applied to the EGR valve and the pulsating flow rate passes through the EGR valve for the small flow rate. There is a problem that the control cannot be performed with high accuracy even if it is controlled by the stepping motor. Furthermore, in order to control the EGR valve by using the stepping motor for the hot exhaust gas,
There is a problem that heat resistance is required and the structure becomes complicated.
【０００４】本発明は上記従来の問題点に着目し、エン
ジンの排気ガス還流装置に係わり、特には、排気ガスの
一部を２個以上の同じ形状の簡単な構造のＥＧＲバルブ
を通過させ、排気ガスの一部をエンジンの回転速度と負
荷に応じて精度を良く吸気側に還流させるエンジンの排
気ガス還流装置の改良の提供を目的とする。The present invention focuses on the above-mentioned conventional problems, and relates to an exhaust gas recirculation system for an engine. In particular, a part of the exhaust gas is passed through two or more EGR valves of the same shape and a simple structure, An object of the present invention is to provide an improvement of an exhaust gas recirculation device for an engine, which recirculates a part of exhaust gas to an intake side with good accuracy according to the engine speed and load.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明のエンジンの排気ガス還流装置の第１発明で
は、排気ガスの一部をエンジンの回転速度と負荷に応じ
てＥＧＲ率調量用バルブにより調整して吸気側に還流さ
せるエンジンの排気ガス還流装置において、還流路に並
列に複数の同じ形状のＥＧＲ率調量用バルブと、ＥＧＲ
率調量用バルブの排気ガス入口もしくは出口側に共通ボ
リューム室を配置している。In order to achieve the above object, in the first invention of the exhaust gas recirculation system for an engine of the present invention, a part of the exhaust gas is adjusted by the EGR rate according to the engine speed and the load. In an exhaust gas recirculation device for an engine that is adjusted by a quantity valve and recirculates to the intake side, a plurality of EGR rate adjustment valves of the same shape are arranged in parallel in a recirculation path,
A common volume chamber is arranged on the exhaust gas inlet or outlet side of the rate adjustment valve.
【０００６】第１発明を主体とする第２の発明では、前
記ＥＧＲ率調量用バルブをＯＮ−ＯＦＦバルブとしてい
る。また、第１発明を主体とする第３の発明では、ＥＧ
Ｒ率調量用バルブの排気ガス出入口に同一容量の共通ボ
リューム室を設けている。In the second invention, which is mainly based on the first invention, the EGR rate adjusting valve is an ON-OFF valve. In addition, in the third invention mainly based on the first invention, EG
A common volume chamber of the same capacity is provided at the exhaust gas inlet / outlet of the R rate adjustment valve.
【０００７】第１発明あるいは第３発明を主体とする第
４発明では、エンジンの回転速度を検出する回転速度セ
ンサと、エンジンへの燃料噴射量を検出しエンジンの負
荷を検出するエンジン負荷センサと、センサからの信号
により２個以上のＥＧＲ率調量用バルブのうち、少なく
とも１個のＥＧＲ率調量用バルブの開度量を制御する制
御装置と、からなる。In a fourth aspect of the invention, which is mainly the first or third aspect of the invention, there is provided a rotation speed sensor for detecting the rotation speed of the engine, and an engine load sensor for detecting the amount of fuel injected into the engine to detect the load on the engine. A control device for controlling the opening amount of at least one EGR rate adjusting valve among the two or more EGR rate adjusting valves by a signal from the sensor.
【０００８】第１発明あるいは第４発明を主体とする第
５発明では、１個以上の等しいＥＧＲ率調量用バルブの
開度量を制御する駆動圧力にエンジンで発生する圧力を
用いる。In the fifth invention mainly consisting of the first invention or the fourth invention, the pressure generated in the engine is used as the drive pressure for controlling the opening amount of one or more equal EGR rate adjusting valves.
【０００９】[0009]
【作用】上記構成によれば、大流量用ＥＧＲバルブを用
いるのでなく、複数の同じＥＧＲバルブを用いるので安
価にできる。また、ＥＧＲバルブの開・閉をＯＮ−ＯＦ
Ｆバルブの制御で行うので構造が簡単になるとともに、
ＥＧＲバルブには耐熱性の構成としているので、駆動圧
力にエンジンで発生する正圧力の流体を用いる。また、
ＥＧＲバルブの排気ガス入口にボリューム室を設けてい
るので、エンジンの排気ガスが一定の圧力でなく、ま
た、排気流量に脈動があっても、これらは吸収されて、
簡単な構造のＥＧＲバルブでも精度良く制御出来る。さ
らにまた、ＥＧＲバルブの排気ガス出入口に共通のボリ
ューム室を設けて、排気ガス出入口の圧力バランスを同
一にしているので制御が均一になり吸気側に還流させる
排気ガス量のバラツキをなくすことができる。According to the above structure, a plurality of the same EGR valves are used instead of the large flow rate EGR valve, so that the cost can be reduced. In addition, the opening and closing of the EGR valve is turned ON-OF.
Since it is controlled by the F valve, the structure is simple and
Since the EGR valve has a heat resistant structure, a positive pressure fluid generated in the engine is used as the driving pressure. Also,
Since a volume chamber is provided at the exhaust gas inlet of the EGR valve, even if the exhaust gas of the engine does not have a constant pressure and the exhaust flow rate has pulsations, these are absorbed,
Even an EGR valve with a simple structure can be controlled accurately. Furthermore, since a common volume chamber is provided at the exhaust gas inlet / outlet of the EGR valve and the pressure balance of the exhaust gas inlet / outlet is made the same, the control becomes uniform, and the variation in the amount of exhaust gas recirculated to the intake side can be eliminated. .
【００１０】[0010]
【実施例】以下に、本発明に係わるエンジンの排気ガス
還流装置につき、図面を参照して詳細に説明する。図１
は本発明のエンジンの排気ガス還流装置の一実施例の全
体システム図を示す。図１において、エンジン１０への
空気供給回路（図１の実線の矢印Ａで示す。）には、吸
気フィルタ１１から過給機１２のブロア１２ａ、およ
び、インタークーラ１３が配設され、供給空気は吸気フ
ィルタ１１で空気中のゴミが除去された後に、ブロア１
２ａで加圧され、インタークーラ１３で冷却されてエン
ジン１０のシリンダ室１０ａに送られている。インター
クーラ１３には冷却水用の冷却水配管１４が連結されて
いる。また、インタークーラ１３からの冷却水配管１４
は水分除去付ＥＧＲガス熱交換器４０に接続されてい
る。なお、インタークーラ１３と水分除去付ＥＧＲガス
熱交換器４０の冷却水配管１４は接続されているが、別
々に独立していても良い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An exhaust gas recirculation system for an engine according to the present invention will be described below in detail with reference to the drawings. Figure 1
FIG. 1 shows an overall system diagram of an embodiment of an exhaust gas recirculation system for an engine of the present invention. In FIG. 1, an air supply circuit (indicated by a solid arrow A in FIG. 1) to the engine 10 is provided with a blower 12a of the supercharger 12 from the intake filter 11 and an intercooler 13. After the dust in the air is removed by the intake filter 11, the blower 1
It is pressurized by 2a, cooled by the intercooler 13 and sent to the cylinder chamber 10a of the engine 10. A cooling water pipe 14 for cooling water is connected to the intercooler 13. In addition, the cooling water pipe 14 from the intercooler 13
Is connected to the EGR gas heat exchanger 40 with water removal. The intercooler 13 and the cooling water pipe 14 of the EGR gas heat exchanger 40 with water removal are connected, but may be separate and independent.
【００１１】エンジン１０からの排ガスの排気回路（図
１の点線矢印Ｂで示す。）には、過給機１２のタービン
１２ｂと、排気マフラ１５とが配設されている。また、
空気供給回路と排ガスの排気回路との間のＥＧＲ回路
（図１の一点鎖線の矢印Ｃで示す。）には、ＥＧＲバル
ブ部２０と、ＥＧＲフィルタ３０と、水分除去付ＥＧＲ
ガス熱交換器４０とが配設されている。ＥＧＲ回路と排
気回路との接続位置Ｅは排気回路のエンジン１０とター
ビン１２ｂとの間にあり、ＥＧＲ回路と空気供給回路と
の接続位置Ｆは空気供給回路の吸気フィルタ１１とブロ
ア１２ａとの間にある。A turbine 12b of a supercharger 12 and an exhaust muffler 15 are arranged in an exhaust circuit for exhaust gas from the engine 10 (shown by a dotted arrow B in FIG. 1). Also,
The EGR circuit between the air supply circuit and the exhaust gas exhaust circuit (indicated by the arrow C of the alternate long and short dash line in FIG. 1) includes an EGR valve unit 20, an EGR filter 30, and an EGR unit with moisture removal.
A gas heat exchanger 40 is provided. The connection position E between the EGR circuit and the exhaust circuit is between the engine 10 and the turbine 12b in the exhaust circuit, and the connection position F between the EGR circuit and the air supply circuit is between the intake filter 11 and the blower 12a in the air supply circuit. It is in.
【００１２】図２はＥＧＲバルブ部２０の一実施例のシ
ステム図を示す。ＥＧＲバルブ部２０は、ＥＧＲ率調量
用バルブ２１ａ、２１ｂ・・と、制御付ＥＧＲ率調量用
バルブ２２ａ、２２ｂ、・・・と、排気ガスの入口側に
入口共通ボリューム室２３と、排気ガスの出口側に出口
共通ボリーム室２４と、からなっている。ＥＧＲ率調量
用バルブ２１ａ、２１ｂには、エンジンのエンジン１０
の回転速度または負荷に応じて変化するターボブースト
圧力が作用している。また、制御付ＥＧＲ率調量用バル
ブ２２ａ、２２ｂには、コントローラ等の制御装置５０
により制御されるＯＮ−ＯＦＦバルブ２５を介してター
ボブースト圧力が作用している。上記実施例では、ター
ボブースト圧力を用いているが、エンジンの回転速度ま
たは負荷に応じて変化する流体、例えば、燃料ポンプの
圧力、あるいは、エンジン潤滑用の油圧力等であれば良
い。FIG. 2 shows a system diagram of an embodiment of the EGR valve section 20. The EGR valve unit 20 includes EGR rate adjusting valves 21a, 21b, ..., EGR rate adjusting valves 22a, 22b, ... With control, an inlet common volume chamber 23 on the exhaust gas inlet side, and an exhaust gas. On the gas outlet side, a common outlet chamber 24 is provided. The EGR rate adjusting valves 21a and 21b are provided with the engine 10 of the engine.
The turbo boost pressure, which changes depending on the rotation speed or load of, is acting. Further, the control EGR rate control valves 22a and 22b are provided with a control device 50 such as a controller.
The turbo boost pressure is acting through the ON-OFF valve 25 controlled by. In the above embodiment, the turbo boost pressure is used, but a fluid that changes according to the rotation speed or load of the engine, such as the pressure of the fuel pump or the oil pressure for engine lubrication, may be used.
【００１３】制御装置５０には、エンジン１０への図示
しない燃料の噴射ポンプの噴射量指示値等を測定してエ
ンジンの負荷を検出するエンジン負荷センサ５１と、エ
ンジン１０の回転速度を検出する回転速度センサ５２が
接続されている。制御装置５０はエンジン１０の回転速
度および負荷等の信号を受けて、回転速度と負荷に応じ
て空気供給側に戻すＥＧＲガス量を調整している。The control unit 50 includes an engine load sensor 51 for detecting an engine load by measuring an injection amount instruction value of a fuel injection pump (not shown) for the engine 10, and a rotation for detecting the rotational speed of the engine 10. The speed sensor 52 is connected. The control device 50 receives signals such as the rotation speed and load of the engine 10 and adjusts the amount of EGR gas returned to the air supply side according to the rotation speed and load.
【００１４】共通ボリューム室２３、２４はエンジンの
排気ガスの脈動、および、圧力の変化を吸収するように
所定の大きさの容積にしてある。また、共通ボリューム
室２３、２４は複数のＥＧＲ率調量用バルブ２１と制御
付ＥＧＲ率調量用バルブ２２とが配設されるように、複
数の取着ポートが設けられ、排気ガス量が少ないときに
はメクラ栓で塞ぐようにしても良い。また、共通ボリュ
ーム室２３、２４に仕切りを設けて脈動を解消するよう
にしても良い。ＥＧＲバルブ部２０では、エンジン１０
の回転速度と負荷に応じて空気供給側に戻すＥＧＲガス
量を調整してＥＧＲフィルタ３０に送り、ＥＧＲフィル
タ３０では排気ガス中のススを除去する。水分除去付Ｅ
ＧＲガス熱交換器４０では、空気供給回路に供給する排
気ガスを冷却するとともに、排気ガスから冷却時に生ず
る水を除去して空気供給回路に入らないようにしてい
る。The common volume chambers 23 and 24 have a predetermined volume so as to absorb the pulsation of the exhaust gas of the engine and the change in pressure. Further, the common volume chambers 23 and 24 are provided with a plurality of attachment ports so that the plurality of EGR rate adjusting valves 21 and the controlled EGR rate adjusting valve 22 are provided, and the exhaust gas amount is When the number is low, it may be blocked with a blind plug. Further, partitions may be provided in the common volume chambers 23 and 24 to eliminate the pulsation. In the EGR valve unit 20, the engine 10
The EGR gas amount to be returned to the air supply side is adjusted according to the rotation speed and the load of the EGR filter 30 and sent to the EGR filter 30. The EGR filter 30 removes soot in the exhaust gas. E with water removal
In the GR gas heat exchanger 40, the exhaust gas supplied to the air supply circuit is cooled, and water generated during cooling is removed from the exhaust gas so as not to enter the air supply circuit.
【００１５】図３はＥＧＲ率調量用バルブ２１ａの一実
施例の側方断面図を示す。ＥＧＲ率調量用バルブ２１ａ
は、ボリューム室に取り付けるボディ６１と、ボディ６
１に摺動自在に支持されるバルブ６２と、バルブ６２の
一端側に取着され、バルブ６２をボディ６１に押し付け
て閉じるバネ６３と、バルブ６２の一端側に当接し、バ
ルブ６２を押し下げるピストン６４と、ピストン６４を
収納し、シリンダ室６５を形成するシリンダカップ６６
と、からなる。また、ＥＧＲ率調量用バルブ２１ａで
は、ボディ６１とシリンダカップ６５との間にバネ６３
の一端が当接するシールリング６７が配設され、排気ガ
スの熱がピストン６４に伝わるのを防止している。これ
により耐熱性のＥＧＲ率調量用バルブ２１ａとしてい
る。FIG. 3 is a side sectional view of an embodiment of the EGR rate adjusting valve 21a. EGR rate adjustment valve 21a
Is a body 61 to be attached to the volume chamber, and a body 6
1, a valve 62 slidably supported on the valve 1, a spring 63 attached to one end of the valve 62 and pressing the valve 62 against the body 61 to close the piston, and a piston abutting against one end of the valve 62 to push down the valve 62. Cylinder cup 66 for accommodating 64 and piston 64 and forming a cylinder chamber 65
And consists of. Further, in the EGR rate adjusting valve 21 a, the spring 63 is provided between the body 61 and the cylinder cup 65.
A seal ring 67 with which one end of the piston abuts is disposed to prevent heat of the exhaust gas from being transmitted to the piston 64. Thus, the heat-resistant EGR rate adjusting valve 21a is obtained.
【００１６】上記構成において次に作動について説明す
る。排気ガスを空気供給回路に還流するＥＧＲ回路につ
いて説明する。ＥＧＲ回路は上流（エンジン１０のシリ
ンダ室１０ａの排気側）より順次、ＥＧＲバルブ部２
０、ＥＧＲフィルタ３０、水分除去付ＥＧＲガス熱交換
器４０の排気ガス冷却器４１、水抜きタンク４２の順で
配設され、エンジン１０の回転速度と負荷に応じて空気
供給側に戻すＥＧＲガス率を調整している。このとき、
ＥＧＲガス率〔ＥＧＲガス率＝｛ＥＧＲガス量／（新気
量＋ＥＧＲガス量）｝〕はＥＧＲ率調量用バルブ２１
ａ、２１ｂ・・と、制御付ＥＧＲ率調量用バルブ２２
ａ、２２ｂ、・・・を開閉し、この開口面積の変化によ
りエンジン１０の回転速度と負荷に応じて空気供給側に
戻すＥＧＲガス量を制御する。ＥＧＲ率調量用バルブ２
１ａ、２１ｂの開口面積の制御には、エンジンのエンジ
ン１０の回転速度または負荷に応じて変化する流体の正
圧力が作用している。Next, the operation of the above structure will be described. An EGR circuit that recirculates exhaust gas to the air supply circuit will be described. The EGR circuit is sequentially arranged from the upstream (exhaust side of the cylinder chamber 10a of the engine 10) to the EGR valve unit 2
0, the EGR filter 30, the exhaust gas cooler 41 of the EGR gas heat exchanger 40 with moisture removal, and the water drain tank 42 in this order, and the EGR gas returned to the air supply side according to the rotation speed and load of the engine 10. Adjusting rates. At this time,
The EGR gas rate [EGR gas rate = {EGR gas amount / (fresh air amount + EGR gas amount)}] is the EGR rate adjusting valve 21.
a, 21b, ... And a valve 22 for controlling EGR rate adjustment
.. are opened and closed, and the amount of EGR gas returned to the air supply side is controlled according to the rotation speed and load of the engine 10 by changing the opening area. EGR rate adjustment valve 2
The positive pressure of the fluid, which changes according to the rotation speed or load of the engine 10 of the engine, acts on the control of the opening areas of 1a and 21b.
【００１７】上記において、ＥＧＲガス率の精度を向上
させるために、制御付ＥＧＲ率調量用バルブ２２ａ、２
２ｂ、・・は、エンジン１０の負荷を検出するエンジン
負荷センサ５１と、エンジン１０の回転速度を検出する
回転速度センサ５２とからの信号を受ける制御装置５０
からの信号により制御され、エンジン回転速度と負荷に
応じて空気供給側に戻すＥＧＲガス率を調整している。
このとき、エンジン１０の負荷に応じて、図４に示すよ
うにエンジン負荷率とＥＧＲガス率とを変化させてい
る。即ち、エンジン１０の負荷に対する制御は、負荷が
小さいとき、ＯＮ−ＯＦＦバルブを開いて、ＥＧＲバル
ブを開く。これにより、ＥＧＲガス率を大きくしてい
る。また、負荷が大きいとき、ＯＮ−ＯＦＦバルブを閉
じて、ＥＧＲバルブを閉じる。これにより、ＥＧＲガス
率を小さくしている。さらに、他の例として、図５に示
すようにエンジン回転速度とＥＧＲガス率とを変化させ
ても良い。この場合に、エンジン１０の回転速度に対す
る制御は、回転速度が大きいとき、ＯＮ−ＯＦＦバルブ
を閉じて、ＥＧＲバルブを閉じる。これにより、ＥＧＲ
ガス率を小さくしている。また、回転速度が小さいと
き、ＯＮ−ＯＦＦバルブを開いて、ＥＧＲバルブを開
く。これにより、ＥＧＲガス率を大きくしている。この
とき、例えば、図６に示すフローチャート図に従い制御
される。エンジン１０の回転速度と負荷が小さい場合に
は、制御装置５０からの信号により制御されるＯＮ−Ｏ
ＦＦバルブ２５のうち最適なＥＧＲ率を与えるのに必要
な個数が開き、制御付ＥＧＲ率調量用バルブ２２のシリ
ンダ室６５に正圧源から流体の圧力を送り、ピストン６
４とともにバルブ６２を押し下げて、制御付ＥＧＲ率調
量用バルブ２２のうち必要個数が開く。このとき、同様
に、圧源から流体の圧力がＥＧＲ率調量用バルブ２１
ａ、２１ｂ・・のシリンダ室６５に送られ、ＥＧＲ率調
量用バルブ２１ａ、２１ｂは開き状態を維持している。
これによりＥＧＲガス率は大きくなる。In the above, in order to improve the accuracy of the EGR gas rate, the controlled EGR rate adjusting valves 22a, 2 are provided.
Control devices 50 that receive signals from an engine load sensor 51 that detects the load of the engine 10 and a rotation speed sensor 52 that detects the rotation speed of the engine 10.
The EGR gas rate returned to the air supply side is adjusted according to the engine speed and the load.
At this time, the engine load rate and the EGR gas rate are changed according to the load of the engine 10 as shown in FIG. That is, in the control of the load of the engine 10, when the load is small, the ON-OFF valve is opened and the EGR valve is opened. As a result, the EGR gas rate is increased. When the load is large, the ON-OFF valve is closed and the EGR valve is closed. This reduces the EGR gas rate. Further, as another example, the engine speed and the EGR gas rate may be changed as shown in FIG. In this case, the control for the rotation speed of the engine 10 is to close the ON-OFF valve and close the EGR valve when the rotation speed is high. As a result, EGR
The gas rate is reduced. When the rotation speed is low, the ON-OFF valve is opened and the EGR valve is opened. As a result, the EGR gas rate is increased. At this time, for example, control is performed according to the flowchart shown in FIG. When the rotation speed and load of the engine 10 are small, the ON-O controlled by the signal from the control device 50.
The number of the FF valves 25 required to give the optimum EGR rate is opened, and the fluid pressure is sent from the positive pressure source to the cylinder chamber 65 of the controllable EGR rate adjustment valve 22, and the piston 6
4, the valve 62 is pushed down to open the required number of the EGR rate adjusting valve 22 with control. At this time, similarly, the pressure of the fluid from the pressure source is changed by the EGR rate adjusting valve 21.
are sent to the cylinder chambers 65a, 21b, ..., And the EGR rate adjusting valves 21a, 21b are kept open.
This increases the EGR gas rate.
【００１８】エンジン１０の回転速度と負荷が大きくな
るに従い、順次に制御装置５０はＯＮ−ＯＦＦバルブ２
５に指令を出力して順次にＯＮ−ＯＦＦバルブ２５を閉
じていき、制御付ＥＧＲ率調量用バルブ２２ａ、２２ｂ
のシリンダ室６５への流体の圧力の送りを停止し、ピス
トン６４をバネ６３で戻してバルブ６２を押し上げて、
制御付ＥＧＲ率調量用バルブ２２ａ、２２ｂを閉じてい
く。これによりこれによりＥＧＲガス率は小さくなる。
また、他の実施例として、ターボブースト圧力を用いて
制御しても良い。この場合には、ターボブースト圧力に
応じてＥＧＲ率調量用バルブ２１ａ、２１ｂの開口面積
を調整するとともに、ターボブースト圧力を制御付ＥＧ
Ｒ率調量用バルブ２２ａ、２２ｂに送り、制御付ＥＧＲ
率調量用バルブ２２ａ、２２ｂを開く。これによりＥＧ
Ｒガス率は大きくなる。As the rotation speed and load of the engine 10 increase, the control device 50 sequentially controls the ON-OFF valve 2
5, the ON-OFF valve 25 is sequentially closed, and the EGR rate adjusting valves 22a and 22b with control are closed.
Of the fluid pressure to the cylinder chamber 65 is stopped, the piston 64 is returned by the spring 63, and the valve 62 is pushed up.
The EGR rate adjusting valves with control 22a and 22b are closed. This reduces the EGR gas rate.
Further, as another embodiment, the control may be performed using the turbo boost pressure. In this case, the opening areas of the EGR rate adjustment valves 21a and 21b are adjusted according to the turbo boost pressure, and the turbo boost pressure is controlled by the EG.
EGR with control sent to valves 22a and 22b for R rate adjustment
The rate adjusting valves 22a and 22b are opened. This makes EG
The R gas rate increases.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
排ガス還流路に並列に複数の同じＥＧＲバルブを用い、
このうち１個以上のＥＧＲバルブの開・閉の制御にＯＮ
−ＯＦＦバルブを用いるので構造が簡単になるととも
に、ＥＧＲバルブには耐熱性を有している。また、ＥＧ
Ｒバルブの排気ガス入口若しくは出口にボリューム室を
設けているので、エンジンの排気ガスが一定の圧力でな
く脈動があっても、これらに吸収され、簡単な構造のＥ
ＧＲバルブでも精度良く制御出来る。さらに、ＥＧＲバ
ルブの排気ガス出入口に共通のボリューム室を設けて圧
力バランスを同一にしているので吸気側に還流させる排
気ガス量のバラツキをなくすことができるという優れた
効果が得られる。As described above, according to the present invention,
Using multiple same EGR valves in parallel to the exhaust gas recirculation path,
ON for opening / closing control of one or more EGR valves
Since the -OFF valve is used, the structure is simple and the EGR valve has heat resistance. Also, EG
Since a volume chamber is provided at the exhaust gas inlet or outlet of the R valve, even if the exhaust gas of the engine does not have a constant pressure but pulsates, it is absorbed by these and E of a simple structure
A GR valve can also be controlled accurately. Further, since a common volume chamber is provided at the exhaust gas inlet / outlet port of the EGR valve to make the pressure balance the same, it is possible to eliminate the variation in the amount of exhaust gas recirculated to the intake side.
【図１】本発明のエンジンの排気ガス還流装置の一実施
例の全体システム図を示す。FIG. 1 is an overall system diagram of an embodiment of an exhaust gas recirculation system for an engine of the present invention.
【図２】本発明のＥＧＲバルブ部２０の一実施例のシス
テム図を示す。FIG. 2 shows a system diagram of an embodiment of the EGR valve unit 20 of the present invention.
【図３】ＥＧＲ率調量用バルブ２１ａの一実施例の側方
断面図を示す。FIG. 3 is a side sectional view showing an embodiment of an EGR rate adjusting valve 21a.
【図４】エンジン負荷率とＥＧＲガス率との関係を示す
図である。FIG. 4 is a diagram showing a relationship between an engine load rate and an EGR gas rate.
【図５】エンジン回転速度とＥＧＲガス率との関係を示
す図である。FIG. 5 is a diagram showing a relationship between an engine rotation speed and an EGR gas rate.
【図６】ＥＧＲバルブ部の開口制御を示すフローチャー
ト図である。FIG. 6 is a flowchart showing the opening control of the EGR valve section.
【図７】エンジン回転速度とエンジン負荷率と吸気側に
還流させる還流量との関係を説明する図である。FIG. 7 is a diagram illustrating a relationship among an engine rotation speed, an engine load factor, and a recirculation amount that is recirculated to an intake side.
１０……エンジン、１１……吸気フィルタ、１２……過
給機、１３……インタークーラ、１５……排気マフラ、
２０……ＥＧＲバルブ部、２１……ＥＧＲ率調量用バル
ブ、２２……制御付ＥＧＲ率調量用バルブ、２３……入
口共通ボリューム室、２４……出口共通ボリューム室、
２５……ＯＮ−ＯＦＦバルブ、３０……ＥＧＲフィル
タ、４０……水分除去付ＥＧＲガス熱交換器、５０……
制御装置、５１……エンジン負荷センサ、５２……回転
速度センサ。10 ... Engine, 11 ... Intake filter, 12 ... Supercharger, 13 ... Intercooler, 15 ... Exhaust muffler,
20 ... EGR valve section, 21 ... EGR rate adjusting valve, 22 ... EGR rate adjusting valve with control, 23 ... Inlet common volume chamber, 24 ... Outlet common volume chamber,
25 ... ON-OFF valve, 30 ... EGR filter, 40 ... EGR gas heat exchanger with water removal, 50 ...
Control device, 51 ... Engine load sensor, 52 ... Rotation speed sensor.
Claims (5)
荷に応じてＥＧＲ率調量用バルブにより調整して吸気側
に還流させるエンジンの排気ガス還流装置において、還
流路に並列に設けられた複数の同じ形状のＥＧＲ率調量
用バルブと、ＥＧＲ率調量用バルブの排気ガス入口若し
くは出口側に共通ボリューム室を配置したことを特徴と
するエンジンの排気ガス還流装置。1. An exhaust gas recirculation device for an engine, in which a part of exhaust gas is adjusted by an EGR rate adjusting valve according to engine speed and load to recirculate to the intake side, is provided in parallel with a recirculation path. An exhaust gas recirculation device for an engine, comprising: a plurality of EGR rate adjusting valves having the same shape; and a common volume chamber arranged on the exhaust gas inlet or outlet side of the EGR rate adjusting valves.
バルブをＯＮ−ＯＦＦバルブとしたことを特徴とするエ
ンジンの排気ガス還流装置。2. The exhaust gas recirculation system for an engine according to claim 1, wherein the EGR rate adjusting valve is an ON-OFF valve.
ブの出入口に同一容量の共通ボリューム室を設けたエン
ジンの排気ガス還流装置。3. The exhaust gas recirculation device for an engine according to claim 1, wherein a common volume chamber having the same capacity is provided at the inlet and outlet of the EGR rate adjusting valve.
ンジンの回転速度を検出する回転速度センサと、エンジ
ンへの燃料噴射量を検出しエンジンの負荷を検出するエ
ンジン負荷センサと、センサからの信号により２個以上
のＥＧＲ率調量用バルブのうち、少なくとも１個のＥＧ
Ｒ率調量用バルブの開度量を制御する制御装置と、から
なるエンジンの排気ガス還流装置。4. The rotation speed sensor for detecting the rotation speed of the engine, the engine load sensor for detecting the fuel injection amount to the engine to detect the load of the engine, and the signal from the sensor according to claim 1 or 2. Therefore, at least one EG among two or more EGR rate adjustment valves
An exhaust gas recirculation device for an engine, comprising a control device that controls the opening amount of an R rate adjustment valve.
個以上の等しいＥＧＲ率調量用バルブの開度量を制御す
る駆動圧力にエンジンで発生する圧力を用いるエンジン
の排気ガス還流装置。5. In claim 1 or claim 4, 1
An exhaust gas recirculation device for an engine, which uses a pressure generated by the engine as a driving pressure for controlling the opening amount of equal or more EGR rate adjustment valves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6064548A JPH07247911A (en) | 1994-03-07 | 1994-03-07 | Exhaust gas reflux device of engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6064548A JPH07247911A (en) | 1994-03-07 | 1994-03-07 | Exhaust gas reflux device of engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07247911A true JPH07247911A (en) | 1995-09-26 |
Family
ID=13261394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6064548A Pending JPH07247911A (en) | 1994-03-07 | 1994-03-07 | Exhaust gas reflux device of engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07247911A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006329051A (en) * | 2005-05-26 | 2006-12-07 | Hino Motors Ltd | Egr device for vehicle engine |
| JP2011157960A (en) * | 2010-01-29 | 2011-08-18 | Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland | Large two-cycle diesel engine with exhaust gas recirculation control system |
| KR101339224B1 (en) * | 2008-12-05 | 2013-12-09 | 현대자동차 주식회사 | Apparatus for diagnosis cooler exhaust gas recirculation on vehicle and method thereof |
-
1994
- 1994-03-07 JP JP6064548A patent/JPH07247911A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006329051A (en) * | 2005-05-26 | 2006-12-07 | Hino Motors Ltd | Egr device for vehicle engine |
| JP4580279B2 (en) * | 2005-05-26 | 2010-11-10 | 日野自動車株式会社 | EGR device for vehicle engine |
| KR101339224B1 (en) * | 2008-12-05 | 2013-12-09 | 현대자동차 주식회사 | Apparatus for diagnosis cooler exhaust gas recirculation on vehicle and method thereof |
| JP2011157960A (en) * | 2010-01-29 | 2011-08-18 | Man Diesel & Turbo Filial Af Man Diesel & Turbo Se Tyskland | Large two-cycle diesel engine with exhaust gas recirculation control system |
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