JPH07301155A - Electrically-operated egr valve device - Google Patents
Electrically-operated egr valve deviceInfo
- Publication number
- JPH07301155A JPH07301155A JP6113456A JP11345694A JPH07301155A JP H07301155 A JPH07301155 A JP H07301155A JP 6113456 A JP6113456 A JP 6113456A JP 11345694 A JP11345694 A JP 11345694A JP H07301155 A JPH07301155 A JP H07301155A
- Authority
- JP
- Japan
- Prior art keywords
- current
- valve device
- diode
- egr valve
- coil
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
-
- 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
- Electrically Driven Valve-Operating Means (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、排気ガスによる公害を
防止するためにエンジンから出てきた排気ガスの一部を
再び吸気系に導入しＮＯｘの排出を減少させる排気再循
環ＥＧＲに関し、特にＥＧＲに用いられる電動ＥＧＲバ
ルブ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas recirculation EGR which reduces a NOx emission by introducing a part of exhaust gas emitted from an engine into an intake system in order to prevent pollution by exhaust gas. The present invention relates to an electric EGR valve device used for EGR.
【０００２】[0002]
【従来技術】ガソリンエンジンの特性から燃焼温度が高
くなると、ＮＯｘの発生量が増加する傾向にある。そこ
で排気ガスの一部を吸気系に導入して混合気に混入する
ことにより燃焼温度を下げ、ＮＯｘの発生を抑制するＥ
ＧＲが採用されている。2. Description of the Related Art Due to the characteristics of gasoline engines, when the combustion temperature rises, the amount of NOx produced tends to increase. Therefore, a portion of the exhaust gas is introduced into the intake system and mixed into the mixture to lower the combustion temperature and suppress the generation of NOx.
GR is adopted.
【０００３】しかし多量に排気ガスを再循環させてしま
うと出力の低下が大きく燃焼も不安定となるため還流路
にＥＧＲバルブを介装して再循環させる排気ガスの還流
量を制御している。排気ガス還流量はエンジンの出力、
燃費、運転性などエンジンの性能に大きく影響を与える
ことになるので、ＥＧＲバルブのバルブ開度制御は細緻
になされ、電動ＥＧＲバルブ装置においてはバルブの開
度を検出するセンサーを自ら備えていて常時バルブ開度
を把握できるようになっている（特開平１−２１９３４
７号公報）。However, if a large amount of exhaust gas is recirculated, the output is greatly reduced and combustion becomes unstable. Therefore, an EGR valve is provided in the recirculation passage to control the recirculation amount of the exhaust gas. . Exhaust gas recirculation amount is the engine output,
Since the engine performance such as fuel consumption and drivability will be greatly affected, the valve opening control of the EGR valve has been made fine, and in the electric EGR valve device, a sensor for detecting the valve opening is always provided and The valve opening degree can be grasped (Japanese Patent Laid-Open No. 1-21934).
7 publication).
【０００４】同センサーの検出信号は電子制御ユニット
ＥＣＵに入力されて処理され、同ＥＣＵにより電動ＥＧ
Ｒバルブ装置がフィードバック制御されバルブ開度が微
妙にコントロールされる。A detection signal of the sensor is input to an electronic control unit ECU and processed, and the ECU controls the electric EG.
The R valve device is feedback-controlled to finely control the valve opening.
【０００５】[0005]
【解決しようとする課題】したがって電動ＥＧＲバルブ
装置を制御するＥＣＵ側の電流引き回し回路が変化する
と電流波形が変化して電動ＥＧＲバルブ装置の制御に影
響が出る。例えばＥＣＵ側に搭載されているダイオード
等の発熱によりＥＣＵの演算処理能力が低下したりする
と制御信号を変化させるおそれがある。そのためＥＣＵ
側に素子の放熱による影響を受けない特殊な構造を必要
とする等の対策を講じなければならず、それがためにＥ
ＣＵが大型化する等の問題があった。Therefore, when the current routing circuit on the ECU side for controlling the electric EGR valve device changes, the current waveform changes and the control of the electric EGR valve device is affected. For example, if the calculation processing capability of the ECU decreases due to heat generated by a diode or the like mounted on the ECU side, the control signal may change. Therefore ECU
It is necessary to take measures such as requiring a special structure on the side that is not affected by the heat radiation of the element.
There was a problem such as the CU becoming larger.
【０００６】本発明はかかる点に鑑みなされたもので、
その目的とする処は制御側の回路変更の影響を受けず安
定した性能を維持できる電動ＥＧＲバルブ装置を供する
点にある。The present invention has been made in view of the above points,
The purpose is to provide an electric EGR valve device that can maintain stable performance without being affected by circuit changes on the control side.
【０００７】[0007]
【課題を解決するための手段および作用】上記目的を達
成するために、本発明は、エンジンの排気再循環に用い
られる電動ＥＧＲバルブ装置において、バルブを駆動す
る励磁コイルにダイオードを並列に接続しバルブ装置内
で閉回路を構成した電動ＥＧＲバルブ装置とした。In order to achieve the above object, the present invention relates to an electric EGR valve device used for exhaust gas recirculation of an engine, in which a diode is connected in parallel to an exciting coil for driving the valve. The electric EGR valve device has a closed circuit in the valve device.
【０００８】したがって励磁電流のオフ時にダイオード
がフリーホイーリングダイオードとして働き閉回路を電
流が還流して電流を一定に維持するので、ＥＣＵ等の制
御側の回路変更の影響を受けず性能が安定化する。Therefore, when the exciting current is turned off, the diode acts as a freewheeling diode and the current circulates in the closed circuit to maintain the current constant, so that the performance is stabilized without being affected by the circuit change on the control side such as the ECU. To do.
【０００９】[0009]
【実施例】以下図１および図２に図示した本発明の一実
施例について説明する。図１が本実施例の電動ＥＧＲバ
ルブ装置１の概略断面図である。電動ＥＧＲバルブ装置
１は大きく３つの部分に別れ、図１において上部が位置
センサー２、中間部がリニアソレノイド３、下部がバル
ブ機構４である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. FIG. 1 is a schematic sectional view of an electric EGR valve device 1 of this embodiment. The electric EGR valve device 1 is roughly divided into three parts. In FIG. 1, an upper part is a position sensor 2, an intermediate part is a linear solenoid 3, and a lower part is a valve mechanism 4.
【００１０】中間部のリニアソレノイド３は、上下のス
テイター10，11に挟まれてコイル12が環状に配置され、
ステイター10，11の内周壁の内側円柱空間にアーマチュ
ア13が昇降自在に嵌合していてリターンスプリング14に
よって上方に付勢されている。下側ステイター11の中央
に嵌着された軸受け15に上下に摺動自在に支持されたシ
ャフト16がその上端部を前記アーマチュア13の中心に固
着され一体に昇降できるようになっている。The linear solenoid 3 in the middle part is sandwiched between the upper and lower statusers 10 and 11, and the coil 12 is annularly arranged.
An armature 13 is vertically movably fitted in an inner cylindrical space of the inner peripheral walls of the statusers 10 and 11, and is biased upward by a return spring 14. A shaft 16 slidably supported in a vertical direction on a bearing 15 fitted in the center of the lower stateter 11 is fixed to the center of the armature 13 at the upper end portion thereof so as to be able to move up and down integrally.
【００１１】シャフト16のバルブ機構４側に突出した下
半部の下端にはバルブ18が形成されている。バルブ機構
４のバルブベース20には排気ガスの還流路の一部が形成
されていて、同バルブベース内還流路21の途中にバルブ
シート22が位置して前記シャフト16の下端のバルブ18が
バルブシート22に開閉自在に接離するようになってい
る。A valve 18 is formed at the lower end of the lower half of the shaft 16 protruding toward the valve mechanism 4. A part of the exhaust gas recirculation path is formed in the valve base 20 of the valve mechanism 4, and a valve seat 22 is located in the middle of the valve base recirculation path 21 so that the valve 18 at the lower end of the shaft 16 is a valve The seat 22 can be opened and closed freely.
【００１２】一方上部の位置センサー２は、上下に昇降
自在に支持されたロッド30がリニアソレノイド３の中心
に突出して下端部をアーマチュア13に当接している。ロ
ッド30の上端はブラシホルダー31となりブラシ32を側方
に突出支持しており、ブラシホルダー31部分をリターン
スプリング33により下方へ付勢されている。前記ブラシ
32が摺接する部分にリフト量検出部34が設けられていて
ブラシ32が接する位置からリフト量を検出できるように
なっている。On the other hand, in the upper position sensor 2, a rod 30 supported so as to be movable up and down is projected to the center of the linear solenoid 3 and its lower end is brought into contact with the armature 13. The upper end of the rod 30 serves as a brush holder 31, which laterally projects and supports the brush 32, and the return spring 33 urges the portion of the brush holder 31 downward. The brush
A lift amount detector 34 is provided at a portion where 32 is in sliding contact, and the lift amount can be detected from a position where the brush 32 is in contact.
【００１３】本実施例の電動ＥＧＲバルブ装置１は以上
の構成に加えて、前記リニアソレノイド３のコイル12の
両端引き出し線40，41間にフリーホイーリングダイオー
ド42が介装され、同フリーホイーリングダイオード42は
位置センサー２部に内蔵されるようになっている。フリ
ーホイーリングダイオード42の接続方向は図２に示すよ
うにソレノイド信号入力側の引き出し線40にカソード端
子を接続し、接地側の引き出し線41にアノード端子を接
続する。In addition to the above configuration, the electric EGR valve device 1 of the present embodiment has a freewheeling diode 42 interposed between the lead wires 40 and 41 at both ends of the coil 12 of the linear solenoid 3 and the freewheeling device. The diode 42 is built in the position sensor 2. As for the direction of connection of the freewheeling diode 42, as shown in FIG. 2, the cathode terminal is connected to the lead wire 40 on the solenoid signal input side, and the anode terminal is connected to the lead wire 41 on the ground side.
【００１４】電動ＥＧＲバルブ装置１はＥＣＵの制御下
にあり、引き出し線40に入力されるソレノイド信号はＥ
ＣＵからデューティ信号として入力されるもので、デュ
ーティ信号のデューティ比を変えることでコイル12に供
給される平均電流を変えシャフト16の摺動位置を制御し
てバルブ18によるバルブ開度を調整する。シャフト16の
移動はロッド30を介して位置センサー２のブラシ32をリ
フト量検出部34上に接しながら移動させ、リフト量であ
るシャフト16の移動量を検出することができ、シャフト
16の移動量はすなわちバルブ18のバルブ開度であり、こ
の検出されたバルブ開度はＥＣＵにフィードバックされ
る。The electric EGR valve device 1 is under the control of the ECU, and the solenoid signal input to the lead wire 40 is E.
It is input as a duty signal from the CU. By changing the duty ratio of the duty signal, the average current supplied to the coil 12 is changed to control the sliding position of the shaft 16 and adjust the valve opening degree of the valve 18. The shaft 16 can be moved by moving the brush 32 of the position sensor 2 onto the lift amount detector 34 via the rod 30 to detect the amount of lift of the shaft 16, which is the amount of movement of the shaft 16.
The movement amount of 16 is the valve opening degree of the valve 18, and the detected valve opening degree is fed back to the ECU.
【００１５】こうして電動ＥＧＲバルブ装置１のバルブ
開度はＥＣＵによりフィードバック制御されて高精度に
開度調整がなされる。しかるにリニアソレノイド３のコ
イル12にはオンオフの切り替わるデューティ信号が入力
されるので、電流の立ち下がり時にコイル12のインダク
タンスにより通常電流が不安定になるところであるが、
フリーホイーリングダイオード42を介装しているため電
流オフ時にはコイル12に蓄えられた電磁エネルギーによ
ってフリーホイーリングダイオード42は順バイアスとな
ってコイル12とフリーホイーリングダイオード42との閉
回路を図２に示す方向に電流が還流し電流を一定に維持
しようとする。Thus, the valve opening of the electric EGR valve device 1 is feedback-controlled by the ECU to adjust the opening with high accuracy. However, since the duty signal for switching on and off is input to the coil 12 of the linear solenoid 3, the normal current is unstable due to the inductance of the coil 12 when the current falls.
Since the freewheeling diode 42 is interposed, the freewheeling diode 42 becomes a forward bias due to the electromagnetic energy stored in the coil 12 when the current is off, and the closed circuit between the coil 12 and the freewheeling diode 42 is shown in FIG. The current circulates in the direction indicated by and tries to keep the current constant.
【００１６】このようにコイル12に供給される電流がＥ
ＣＵの回路にかかわらずほぼ一定化するので、ＥＣＵの
回路変更の影響を受けず性能が安定する。またフリーホ
イーリングダイオード42が電動ＥＧＲバルブ装置１側に
装着されることで、ＥＣＵ側に電動ＥＧＲバルブ装置１
からのサージ電圧の心配がなくなり、そのためサージ電
圧対策用の保護手段を設ける必要がなく回路構成を簡素
化することができる。The current supplied to the coil 12 is E
Since it becomes almost constant regardless of the circuit of the CU, the performance is stable without being affected by the circuit change of the ECU. Further, by mounting the freewheeling diode 42 on the electric EGR valve device 1 side, the electric EGR valve device 1 is installed on the ECU side.
Therefore, there is no need to worry about the surge voltage from the circuit, and therefore the circuit configuration can be simplified without the need to provide a protection means for the surge voltage.
【００１７】[0017]
【発明の効果】本発明は、電動ＥＧＲバルブ装置の励磁
コイルにダイオードを並列に接続し閉回路を構成したの
で、励磁電流オフ時にダイオードを介して閉回路を電流
が還流し電流を一定に維持するので、ＥＣＵ等の制御側
の回路変更の影響を受けず性能が安定化する。該ダイオ
ードが電動ＥＧＲバルブ装置側に装着されることで、電
動ＥＧＲバルブ装置からのサージ電圧に対する対策が不
要でＥＣＵ等の制御側の回路構成を簡素化することがで
きる。According to the present invention, the diode is connected in parallel to the exciting coil of the electric EGR valve device to form a closed circuit. Therefore, when the exciting current is turned off, the current circulates through the closed circuit through the diode to keep the current constant. Therefore, the performance is stabilized without being affected by the circuit change on the control side such as the ECU. By mounting the diode on the electric EGR valve device side, it is possible to simplify the circuit configuration on the control side such as the ECU without the need for countermeasures against surge voltage from the electric EGR valve device.
【図１】本発明に係る一実施例の電動ＥＧＲバルブ装置
の概略断面図である。FIG. 1 is a schematic sectional view of an electric EGR valve device according to an embodiment of the present invention.
【図２】同装置のリニアソレノイドの回路図である。FIG. 2 is a circuit diagram of a linear solenoid of the device.
１…電動ＥＧＲバルブ装置、２…位置センサー、３…リ
ニアソレノイド、４…バルブ機構、10，11…ステイタ
ー、12…コイル、13…アーマチュア、14…リターンスプ
リング、15…軸受け、16…シャフト、18…バルブ、20…
バルブベース、21…還流路、22…バルブシート、30…ロ
ッド、31…ブラシホルダー、32…ブラシ、33…リターン
スプリング、34…リフト量検出部、40，41…引き出し
線、42…ダイオード。1 ... Electric EGR valve device, 2 ... Position sensor, 3 ... Linear solenoid, 4 ... Valve mechanism, 10, 11 ... Stater, 12 ... Coil, 13 ... Armature, 14 ... Return spring, 15 ... Bearing, 16 ... Shaft, 18 … Valve, 20…
Valve base, 21 ... Return path, 22 ... Valve seat, 30 ... Rod, 31 ... Brush holder, 32 ... Brush, 33 ... Return spring, 34 ... Lift amount detecting part, 40, 41 ... Lead wire, 42 ... Diode.
Claims (1)
ＥＧＲバルブ装置において、バルブを駆動する励磁コイ
ルにダイオードを並列に接続しバルブ装置内で閉回路を
構成したことを特徴とする電動ＥＧＲバルブ装置。1. An electric EGR valve device used for exhaust gas recirculation of an engine, wherein a diode is connected in parallel to an exciting coil for driving the valve to form a closed circuit in the valve device. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6113456A JPH07301155A (en) | 1994-05-02 | 1994-05-02 | Electrically-operated egr valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6113456A JPH07301155A (en) | 1994-05-02 | 1994-05-02 | Electrically-operated egr valve device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07301155A true JPH07301155A (en) | 1995-11-14 |
Family
ID=14612706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6113456A Pending JPH07301155A (en) | 1994-05-02 | 1994-05-02 | Electrically-operated egr valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07301155A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997043538A1 (en) * | 1996-05-14 | 1997-11-20 | Sagem S.A. | Valve for an internal combustion engine exhaust gas recirculation system |
| WO1999011922A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Space-efficient electromagnetic actuated exhaust gas recirculation valve |
| WO1999011918A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Automotive emission control valve having opposing pressure forces acting on the valve member |
| WO1999011919A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Automotive emission control valve having opposing pressure forces within a port |
| US6062535A (en) * | 1997-02-12 | 2000-05-16 | Cummins Engine Company, Inc. | Exhaust gas recirculation valve with variable flow area |
| US6269472B1 (en) | 1996-02-27 | 2001-07-31 | Lsi Logic Corporation | Optical proximity correction method and apparatus |
| US6426131B1 (en) | 1998-08-24 | 2002-07-30 | Lsi Logic Corporation | Off-axis pupil aperture and method for making the same |
| KR100474198B1 (en) * | 2002-03-18 | 2005-03-09 | 주식회사 유니크 | Electronic control type E.G.R valve for diesel engine |
| FR2865774A1 (en) | 2004-02-03 | 2005-08-05 | Usui Kokusai Sangyo Kk | Exhaust gas cooling apparatus for motor vehicle, has pre-exhaust gas cooler whose temperature is maintained above condensation point of gas, where flow of gas is controlled by exhaust gas valve |
| CN100339587C (en) * | 2003-08-08 | 2007-09-26 | 阿尔卑斯电气株式会社 | Mounting structure of electronic device |
| JP4942823B2 (en) * | 2007-12-27 | 2012-05-30 | 三菱電機株式会社 | Valve device |
| EP3636901A1 (en) | 2018-10-10 | 2020-04-15 | Nikki Co., Ltd. | Control system of egr electric valve |
-
1994
- 1994-05-02 JP JP6113456A patent/JPH07301155A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6269472B1 (en) | 1996-02-27 | 2001-07-31 | Lsi Logic Corporation | Optical proximity correction method and apparatus |
| FR2748780A1 (en) * | 1996-05-14 | 1997-11-21 | Sagem Allumage | VALVE FOR INTERNAL COMBUSTION ENGINE EXHAUST GAS RECIRCULATION SYSTEM |
| WO1997043538A1 (en) * | 1996-05-14 | 1997-11-20 | Sagem S.A. | Valve for an internal combustion engine exhaust gas recirculation system |
| US6062535A (en) * | 1997-02-12 | 2000-05-16 | Cummins Engine Company, Inc. | Exhaust gas recirculation valve with variable flow area |
| US6168134B1 (en) | 1997-02-12 | 2001-01-02 | Cummins Engine Company, Inc. | Exhaust gas recirculation valve with variable flow area |
| WO1999011918A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Automotive emission control valve having opposing pressure forces acting on the valve member |
| WO1999011919A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Automotive emission control valve having opposing pressure forces within a port |
| WO1999011922A1 (en) * | 1997-09-03 | 1999-03-11 | Siemens Canada Limited | Space-efficient electromagnetic actuated exhaust gas recirculation valve |
| US6426131B1 (en) | 1998-08-24 | 2002-07-30 | Lsi Logic Corporation | Off-axis pupil aperture and method for making the same |
| KR100474198B1 (en) * | 2002-03-18 | 2005-03-09 | 주식회사 유니크 | Electronic control type E.G.R valve for diesel engine |
| CN100339587C (en) * | 2003-08-08 | 2007-09-26 | 阿尔卑斯电气株式会社 | Mounting structure of electronic device |
| FR2865774A1 (en) | 2004-02-03 | 2005-08-05 | Usui Kokusai Sangyo Kk | Exhaust gas cooling apparatus for motor vehicle, has pre-exhaust gas cooler whose temperature is maintained above condensation point of gas, where flow of gas is controlled by exhaust gas valve |
| JP4942823B2 (en) * | 2007-12-27 | 2012-05-30 | 三菱電機株式会社 | Valve device |
| EP3636901A1 (en) | 2018-10-10 | 2020-04-15 | Nikki Co., Ltd. | Control system of egr electric valve |
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