JPS6339786B2 - - Google Patents
Info
- Publication number
- JPS6339786B2 JPS6339786B2 JP55136050A JP13605080A JPS6339786B2 JP S6339786 B2 JPS6339786 B2 JP S6339786B2 JP 55136050 A JP55136050 A JP 55136050A JP 13605080 A JP13605080 A JP 13605080A JP S6339786 B2 JPS6339786 B2 JP S6339786B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- coil
- control
- movable
- iron core
- 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.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 238000010586 diagram Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- 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
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
-
- 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
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
-
- 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
- F02M26/65—Constructional details of EGR valves
- F02M26/74—Protection from damage, e.g. shielding means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Description
【発明の詳細な説明】
本発明は排気ガス循環システム、いわゆる
EGRシステムにおけるガス流量制御弁に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust gas circulation system, so-called
Regarding gas flow control valves in EGR systems.
EGRシステムにおいては、排出ガス浄化のた
めに排出ガスの一部を吸気管にもどすための
EGR制御弁（以下単に制御弁と称す）により循
環ガス流量の制御を行つているが、循環（排気）
ガス中には炭酸塊、水蒸気等が含まれておりこれ
らが制御弁の弁軸受部に入り込み易く、そのため
長時間停止後には弁軸が軸受に固着してしまうこ
とがある。 In the EGR system, a part of the exhaust gas is returned to the intake pipe for exhaust gas purification.
The circulating gas flow rate is controlled by the EGR control valve (hereinafter simply referred to as the control valve), but the circulation (exhaust)
The gas contains carbon dioxide, water vapor, etc., which tend to enter the valve bearing of the control valve, which may cause the valve shaft to become stuck to the bearing after a long period of stoppage.
エンジン停止後にこのような弁軸の固着が発生
することを避ける必要があるばかりでなく、この
排気ガス循環を常時行うことは運転性の減退を招
来する場合があり、特にNOXの余り発生しない
軽負荷巡航走行時とかアイドル回転時とかは、
EGR制御弁は閉とした方がよい場合がある。こ
のような場合を考慮すると、弁軸の固着を有効に
防止する必要が大である。 Not only is it necessary to avoid this kind of valve stem sticking after the engine has stopped, but constant exhaust gas circulation can lead to a decline in drivability . During light load cruising or idling,
It may be better to close the EGR control valve. Considering such a case, it is important to effectively prevent the valve stem from sticking.
従来一般に使用されている制御弁としては、弁
体は弁軸端に同心に固定され、軸受に摺動可能に
受承された弁軸の中央部に可動鉄心が軸と一体に
配され第２の軸受を貫通した弁軸の他端にはスプ
リングが弁閉方向へと弁軸を付勢している。可動
鉄心の廻りにはコイルが配され、吸入空気流量信
号等に応じた電圧ないし電流がコイルに供給され
て、弁体はその開度を制御される。通例この電圧
電流は、弁軸が自由に摺動軸受される程度の小さ
なものであり、万一軸受部で固着が生じた場合
に、再び通常の制御電圧電流によつては、固着し
た弁軸を動かすには至らない。 In conventional control valves commonly used, the valve body is fixed concentrically to the end of the valve shaft, and a movable iron core is disposed integrally with the shaft at the center of the valve shaft, which is slidably received in a bearing. At the other end of the valve shaft passing through the bearing, a spring urges the valve shaft in the valve closing direction. A coil is arranged around the movable iron core, and a voltage or current is supplied to the coil according to an intake air flow rate signal, etc., and the opening degree of the valve body is controlled. Usually, this voltage and current is small enough to allow the valve stem to freely slide on the bearing, and if a sticking occurs in the bearing, the normal control voltage and current will again cause the stuck valve stem to be removed. I can't move it.
本発明は、従来のEGR制御弁の上述の問題点
を解消することを目的とする。即ち、本発明は、
制御弁コイルに対しコイル最大定格又はこれに近
い電圧値及び／又は電流値の少なくとも50％以上
の値から成り可動鉄心の往復動に十分な程度に長
い周期を有するON−OFFパルス信号を印加する
ためのパルス発生送出手段を制御回路に付加的に
接続して有し該パルス信号を少くとも１パルス以
上該コイルに印加することを特徴とするEGR制
御弁装置を提供する。 The present invention aims to solve the above-mentioned problems of the conventional EGR control valve. That is, the present invention
Apply to the control valve coil an ON-OFF pulse signal consisting of a value of at least 50% or more of the coil's maximum rating or a voltage value and/or current value close to this, and having a period long enough for the reciprocating movement of the movable iron core. Provided is an EGR control valve device characterized in that it has a pulse generation and sending means additionally connected to a control circuit for applying at least one pulse or more of the pulse signal to the coil.
さらに、該EGR制御装置において、本発明は、
前記パルス信号をイグニツシヨンキーONと共に
少くとも１回発する制御方法、並びに通常制御過
程中において間欠的に前記パルス信号を印加する
制御方法をも弁固着防止方法として提供する。 Furthermore, in the EGR control device, the present invention includes:
A control method in which the pulse signal is emitted at least once when the ignition key is turned on, and a control method in which the pulse signal is intermittently applied during the normal control process are also provided as valve sticking prevention methods.
以下、本発明について詳述する。 The present invention will be explained in detail below.
第１図は、本発明のEGR制御弁装置の一実施
例を示す概略図である。内燃機関のシリンダヘツ
ド４に排気弁７を介してシリンダ室５内へと開口
する排気管２から分岐し、管路１１ｂ、緩衝用
EGRタンク１０、管路１１ａを経てEGR制御弁
２０の弁座部２７側開口（弁入口）が接続され、
弁室２８に開口する弁出口は管路１２を経てスロ
ツトル弁９と吸気弁８との間の吸気管３に接続さ
れて、排気ガス循環路を形成する。 FIG. 1 is a schematic diagram showing an embodiment of the EGR control valve device of the present invention. A pipe line 11b for buffering is branched from an exhaust pipe 2 that opens into the cylinder chamber 5 through an exhaust valve 7 to the cylinder head 4 of the internal combustion engine.
The valve seat 27 side opening (valve inlet) of the EGR control valve 20 is connected via the EGR tank 10 and the pipe 11a.
A valve outlet opening into the valve chamber 28 is connected via a line 12 to the intake pipe 3 between the throttle valve 9 and the intake valve 8, forming an exhaust gas circulation path.
制御弁２０は、弁室２８を可動鉄心室２９と区
画し中心軸上に軸受２３ａ，２３ｂを有し外周部
にコイル室３０を有するボデイ２１内に配され、
弁座２７と摺合する可動弁体（弁体）２２と、こ
れと同軸に弁軸３１に固定された可動鉄心２４
と、軸受２３ａ，２３ｂに軸方向滑動可能に受承
された弁軸３１と、弁軸３１を弁閉方向へ付勢す
るスプリング２６と、コイル室３０内に配された
コイル２５とから成り、通電時開となる弁であ
り、従来のものを用いることができる。一般に弁
軸３１はステンレス製、軸受２３ａ，２３ｂは自
己潤滑性の、例えばグラフアイト等を含有する焼
結金属から成り、特に軸受２３ｂは、可動鉄心室
２９と弁室２８との間の区画シールのために弁軸
３１が微少クリアランスをもつて滑動可能に形成
されている。しかし、この軸受２３ｂは特に高温
の排気ガスに直接曝されており、カーボン粒子そ
の他燃料の高熱下における分解ないし反応生成物
が付着し易い。弁座２７の弁体２２との摺合部も
同様であり、さらに軸受２３ｂについても同様で
ある。 The control valve 20 is disposed within a body 21 that partitions a valve chamber 28 into a movable iron chamber 29, has bearings 23a and 23b on a central axis, and has a coil chamber 30 on the outer periphery.
A movable valve body (valve body) 22 that slides against the valve seat 27, and a movable iron core 24 that is coaxially fixed to the valve shaft 31.
A valve shaft 31 is slidably received in the axial direction by bearings 23a and 23b, a spring 26 biases the valve shaft 31 in the valve closing direction, and a coil 25 disposed in a coil chamber 30. This is a valve that opens when energized, and a conventional valve can be used. In general, the valve shaft 31 is made of stainless steel, and the bearings 23a and 23b are made of self-lubricating sintered metal containing, for example, graphite.In particular, the bearing 23b is a partition seal between the movable iron chamber 29 and the valve chamber 28. Therefore, the valve shaft 31 is formed to be slidable with a small clearance. However, this bearing 23b is directly exposed to particularly high-temperature exhaust gas, and carbon particles and other products of decomposition or reaction of fuel under high heat are likely to adhere thereto. The same applies to the sliding portion of the valve seat 27 with the valve body 22, and the same applies to the bearing 23b.
一方コイル２５には制御弁制御駆動回路１３の
駆動回路１５からの信号線路が接続され、制御弁
制御駆動回路１３は、エンジン吸入空気量信号Ｑ
及びスロツトル開度信号θ、或いは吸気管圧力お
よび排気管圧力等に応じて制御弁２０に対する制
御信号を発するコントローラ１４からの信号を入
力してコイル２５の励起電流ないし電圧を発する
のが、従来の制御駆動回路である。この方式に従
うと、コイル２５には通常コイルの最大定格電流
及び／又は電圧よりもかなり小さな電流電圧が常
時印加されて弁体２２を第１図右方へスプリング
２６に抗して後退させて弁開度を制御する。 On the other hand, a signal line from the drive circuit 15 of the control valve control drive circuit 13 is connected to the coil 25, and the control valve control drive circuit 13 receives the engine intake air amount signal Q.
The conventional method is to input a signal from the controller 14 which issues a control signal to the control valve 20 in accordance with the throttle opening signal θ, the intake pipe pressure, the exhaust pipe pressure, etc. to generate an excitation current or voltage for the coil 25. This is a control drive circuit. According to this system, a current and voltage considerably smaller than the maximum rated current and/or voltage of the coil is normally applied to the coil 25, causing the valve body 22 to retreat to the right in FIG. Control opening degree.
従来のこの方式においては、前述の通り、エン
ジンが停止して弁が閉止した後に、軸受２３ａ，
２３ｂと弁軸３１、さらに弁座２７と弁体２２と
の間において、排ガス中の異物の付着に基く固着
が発生し易く、制御弁２０が閉止のまゝとなつた
り、また通常の制御作動中において、正常時を前
提として発される制御信号に弁体アセンブリ（即
ち、弁体・弁軸・可動鉄心アセンブリ）が付着異
物による抵抗のため正確に応動し難いという問題
が生じている。 In this conventional method, as described above, after the engine has stopped and the valve has closed, the bearings 23a,
23b and the valve stem 31, as well as between the valve seat 27 and the valve body 22, sticking due to adhesion of foreign matter in the exhaust gas is likely to occur, and the control valve 20 may remain closed or normal control operation may occur. Among them, a problem arises in that it is difficult for the valve body assembly (that is, the valve body, valve stem, and movable core assembly) to respond accurately to control signals issued under normal conditions due to resistance due to attached foreign matter.
本発明においては、従来の制御駆動回路１３に
さらに、最大定格又はこれに従い電圧値及び／又
は電流値の少なくとも50％以上の大きさから成る
パルス発生回路１６を接続し、弁体アセンブリを
強制的にかつ瞬間的に往復動させて、固着状態か
ら脱せしめると共に弁軸３１、軸受２３ａ，２３
ｂに付着した異物を除去するようにする。このパ
ルスは、弁体アセンブリの往復動に必要十分な程
度に長い周期、望ましくはコイルへのステツプ入
力に対し、吸引力の大きさが90％の大きさに達す
る時のまたは10％の大きさに減少する時の時定数
の２倍程度の周期を有するON−OFF信号であ
り、好ましくは、OFFのとき通常制御信号をも
OFFとするものである。なお、印加電圧値ない
し電流値は、可動鉄心に生ずる吸引力が最大値な
いしは最大値の90％以上に達するに必要な値とす
ることが好ましい。 In the present invention, a pulse generating circuit 16 having a maximum rating or at least 50% of the voltage value and/or current value according to the maximum rating is further connected to the conventional control drive circuit 13, and the valve body assembly is forced to operate. The valve shaft 31 and the bearings 23a, 23 are reciprocated instantly and released from the stuck state.
Remove any foreign matter attached to b. This pulse has a period long enough to reciprocate the valve body assembly, preferably when the magnitude of the suction force reaches 90% of the magnitude or 10% of the magnitude relative to the step input to the coil. It is an ON-OFF signal that has a cycle that is about twice the time constant when the signal decreases to
It is to be turned off. Note that the applied voltage value or current value is preferably set to a value necessary for the attractive force generated in the movable core to reach the maximum value or 90% or more of the maximum value.
上記パルスの波形及び印加モードは、第２図に
一例として示すように、イグニツシヨンキーON
と同時に開始され、スタータON迄に終了する
ON−OFFパルス信号をする。この場合、パルス
波数は少くとも１パルス上であり、数パルス以上
印加することが好ましい。パルス電流は最大定格
電流値IR又はこれに近いものとし、電圧も必要に
応じ最大定格電圧又はこれに近いものとし、ない
しは、そのいずれかが最大定格の50％以上とし、
他方は最大定格又はこれに近いものとし、所要の
固着離脱力及び自己清浄化力を付与する。なお、
スタータONの際には、エンジン起動の便宜上、
EGR制御弁２０は閉とすることが好ましい。 The waveform and application mode of the above pulse are as shown in Fig. 2 as an example, when the ignition key is turned on.
It starts at the same time and ends by the time the starter turns on.
Generates an ON-OFF pulse signal. In this case, the pulse wave number is at least one pulse higher, and it is preferable to apply several pulses or more. The pulse current shall be at or close to the maximum rated current value I R , and the voltage shall be at or close to the maximum rated voltage as necessary, or either of these shall be 50% or more of the maximum rating,
The other should be at or close to the maximum rating to provide the required breakaway force and self-cleaning force. In addition,
When turning on the starter, for convenience of starting the engine,
Preferably, the EGR control valve 20 is closed.
第３図は、本発明の固着防止上制御方法の他の
態様を示すパルス波形図を示す。即ち、付加パル
スは通常制御電流による、通常のEGR制御弁の
制御作動過程中において適当時間間隔をもつて付
加パルス（ON−OFF）を印加し、その都度弁軸
と軸受との間の自己清浄化を行うものである。こ
の場合、EGR制御弁２０の本来の制御機能に影
響を与えない範囲において付加パルスを印加する
ことが出来、そのため好ましくは１往復動（１サ
イクル）のパルスを所定間隔ｔ毎に発する。この
間隔ｔは、適宜調節可能とすることもできる。こ
の態様においても、電圧を最大定格値又はこれに
近いものとすることができる。この方式は、例え
ばエンジンの始動時に固着が生じていてEGRが
一時的に作動しなくても、デメリツトは実質的に
ないので、EGR制御弁の定常的作動の確保に特
に好ましいものである。 FIG. 3 shows a pulse waveform diagram showing another aspect of the anti-sticking control method of the present invention. That is, additional pulses (ON-OFF) are applied at appropriate time intervals during the normal control operation process of the EGR control valve using the normal control current, and each time the additional pulses are applied to self-clean between the valve shaft and the bearing. It is something that carries out transformation. In this case, the additional pulse can be applied within a range that does not affect the original control function of the EGR control valve 20, and therefore preferably one reciprocating pulse (one cycle) is emitted at predetermined intervals t. This interval t can also be adjusted as appropriate. In this embodiment as well, the voltage can be at or close to the maximum rated value. This method is particularly preferable for ensuring steady operation of the EGR control valve because it has virtually no disadvantages even if the EGR temporarily does not operate due to sticking during engine startup, for example.
最も好ましくは、パルス印加モードとしては、
第１の起動時のパルス印加と、通常EGR制御過
程中の間欠的パルス印加との併用であるが、どち
らか一方でもよい。 Most preferably, the pulse application mode is
The pulse application during the first startup and the intermittent pulse application during the normal EGR control process are used together, but either one of them may be used.
なお、コントローラ１４への入力信号に例えば
スロツトル開度θを一入力信号として、θに応答
してEGR制御弁作動を停止するようにして、ド
ライバビリテイーを向上させることもできる。 Note that drivability can also be improved by using, for example, the throttle opening degree θ as one input signal to the controller 14 and stopping the EGR control valve operation in response to θ.
従来エンジン負荷の大きさにより大まかに
EGR率を変えていたのに対し、EGR制御が閉回
路制御となり正確な制御が行なわれるようになる
と弁の固着の防止の必要性がさらに増大するが、
本発明はこのような場合についても十分対応でき
る。 Roughly depending on the size of the conventional engine load
As opposed to changing the EGR rate, EGR control became closed-circuit control and more accurate control was performed, which further increased the need to prevent valves from sticking.
The present invention can sufficiently cope with such cases.
なお、さらにO2濃度センサ１７の信号エンジ
ンのシリンダ室内温度TEを検出して、これによ
りNOXの発生の濃度を予測してそれに応じて
EGR制御弁を制御することも有用であり、これ
らは従来の吸入空気量に応じた制御入力信号に代
えて／又は付加的に、入力信号として用い、これ
に対応したコントローラを用いることが可能であ
る。 In addition, the signal from the O 2 concentration sensor 17 detects the engine cylinder room temperature T E , thereby predicting the concentration of NO
It is also useful to control the EGR control valves; these can be used as input signals instead of/in addition to conventional intake air flow dependent control input signals, and corresponding controllers can be used. be.
なお、従来のコイルの最大定格値が、本発明の
固着防止のためのパルス印加に対して不足な場合
には、対応して大きな最大定格値を有するコイル
を備えたEGR制御弁を用いるか、或いは逆に固
着面積を出来る限り小さく設計して離脱に要する
力を小さくすることが必要である。 Note that if the maximum rated value of the conventional coil is insufficient for the pulse application to prevent sticking according to the present invention, an EGR control valve equipped with a coil having a correspondingly large maximum rated value may be used, or Or conversely, it is necessary to design the fixed area as small as possible to reduce the force required for detachment.
以上詳述の通り、本発明は、従来のEGR制御
弁装置に特別のパルス発生印加手段を接続し、コ
イルの最大定格値の少なくとも50％以上の値の電
流／電圧パルスを、エンジン起動の際ないしその
直前、或いはEGR制御作動過程中において間欠
的にEGR制御弁のコイルに印加することにより
弁固着防止と自己清浄化を可能としたものであ
る。本発明はまた、従来の装置にわずかの付加的
手段を施すことにより実施可能である点において
も有用であり、さらにEGR装置の寿命の延長・
保守の容易化にも資するものである。 As described in detail above, the present invention connects a special pulse generation/applying means to a conventional EGR control valve device, and applies current/voltage pulses having a value of at least 50% of the maximum rated value of the coil when starting the engine. By intermittently applying the voltage to the coil of the EGR control valve immediately before or during the EGR control operation process, it is possible to prevent the valve from sticking and to perform self-cleaning. The present invention is also useful in that it can be implemented with few additional measures to conventional equipment, and further extends the lifespan of EGR equipment.
This also contributes to easier maintenance.
第１図は、本発明のEGR制御弁装置の一実施
例を示す概略図を示し、第２図、第３図は、本発
明によるパルス印加実施例を夫々示すパルス波形
図を示す。
１３……制御駆動回路、１６……パルス発生回
路、２０……制御弁、２２……弁体、２３ａ，２
３ｂ……軸受、２４……可動鉄心、２５……コイ
ル、２６……スプリング、３１……弁軸。
FIG. 1 shows a schematic diagram showing an embodiment of the EGR control valve device of the present invention, and FIGS. 2 and 3 show pulse waveform diagrams showing pulse application embodiments of the present invention, respectively. 13... Control drive circuit, 16... Pulse generation circuit, 20... Control valve, 22... Valve body, 23a, 2
3b...bearing, 24...movable iron core, 25...coil, 26...spring, 31...valve shaft.
Claims (1)
従動するよう固定された弁体と、可動鉄心の周囲
に配されたコイルとを有し該コイルに通電して弁
開度を制御する型式のEGR制御弁と、該EGR制
御弁の制御信号を発しコイルに制御電圧・電流を
供給する制御駆動回路とから成るEGR制御装置
において、前記制御弁コイルに対しコイル最大定
格又はこれに近い電圧値及び／又は電流値の50％
以上の値から成り可動鉄心の往復動に十分な程度
に長い周期を有するON−OFFパルス信号を印加
するためのパルス発生送出手段を前記制御駆動回
路に付加的に接続して有し、該パルス信号を少な
くとも１パルス以上該コイルに対し印加すること
を特徴とするEGR制御弁装置。 ２ 可動鉄心と、可動鉄心と共通の弁軸上に可動
鉄心に従動するよう固定された弁体と可動鉄心の
周囲に配されたコイルとを有し該コイルに通電し
て弁開度を制御する方式のEGR制御弁の制御方
法において、前記コイルに対しコイル最大定格電
圧値及び／又は電流値の50％以上の値から成り可
動鉄心の往復動に十分な程度に長い周期のON−
OFFパルス信号をイグニツシヨンキーONと共に
少くとも１回発することを特徴とするEGR制御
弁の固着防止制御方法。 ３ 可動鉄心と可動鉄心と共通の弁軸上に可動鉄
心に従動するよう固定された弁体と可動鉄心の周
囲に配されたコイルとを有し該コイルに通電して
弁開度を制御する方式のEGR制御弁の制御方法
において、前記コイルに対しコイル最大定格電圧
値及び／又は電流値の50％以上の値から成り可動
鉄心の往復動に十分な程度に長い周期を有する
ON−OFFパルス信号を通常制御過程中において
間欠的に印加し弁体・弁軸・可動鉄心アセンブリ
を往復動させることを特徴とするEGR制御弁の
固着防止制御方法。[Scope of Claims] 1. A valve having a movable core, a valve body fixed on a common valve shaft so as to be driven by the movable core, and a coil disposed around the movable core, and the coil being energized. In an EGR control device consisting of an EGR control valve of the type that controls the valve opening, and a control drive circuit that generates a control signal for the EGR control valve and supplies control voltage and current to the coil, the coil maximum 50% of the rated voltage and/or current value
A pulse generating and transmitting means is additionally connected to the control drive circuit for applying an ON-OFF pulse signal having the above values and having a period sufficiently long for the reciprocating movement of the movable iron core, and An EGR control valve device characterized in that a signal of at least one pulse or more is applied to the coil. 2. A movable iron core, a valve body fixed on a common valve shaft with the movable iron core so as to follow the movable iron core, and a coil arranged around the movable iron core, and controlling the valve opening degree by energizing the coil. In the control method of the EGR control valve of the method, the coil has a value of 50% or more of the maximum rated voltage value and/or current value of the coil, and has a long period sufficient for the reciprocating movement of the movable iron core.
A method of controlling an EGR control valve to prevent sticking, characterized by emitting an OFF pulse signal at least once when an ignition key is turned ON. 3. The movable core has a valve body fixed on a valve shaft common to the movable core so as to follow the movable core, and a coil arranged around the movable core, and controls the valve opening degree by energizing the coil. In the EGR control valve control method of the above-mentioned method, the coil has a value of 50% or more of the maximum rated voltage value and/or current value of the coil, and has a period long enough for the reciprocating motion of the movable iron core.
A control method for preventing sticking of an EGR control valve characterized by applying an ON-OFF pulse signal intermittently during a normal control process to reciprocate the valve body, valve shaft, and movable iron core assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55136050A JPS5762954A (en) | 1980-09-30 | 1980-09-30 | Egr control valve apparatus and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55136050A JPS5762954A (en) | 1980-09-30 | 1980-09-30 | Egr control valve apparatus and its control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5762954A JPS5762954A (en) | 1982-04-16 |
| JPS6339786B2 true JPS6339786B2 (en) | 1988-08-08 |
Family
ID=15166001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55136050A Granted JPS5762954A (en) | 1980-09-30 | 1980-09-30 | Egr control valve apparatus and its control method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5762954A (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6084949A (en) * | 1983-10-15 | 1985-05-14 | Entatsuku Kk | Cup-shaped winding body and manufacture thereof |
| JPH0324864Y2 (en) * | 1985-06-29 | 1991-05-30 | ||
| JPH07116946B2 (en) * | 1986-10-27 | 1995-12-18 | ヤマハ発動機株式会社 | Vehicle exhaust control device |
| JPH01131924U (en) * | 1988-03-01 | 1989-09-07 | ||
| JPH0335872Y2 (en) * | 1988-08-11 | 1991-07-30 | ||
| US5383486A (en) * | 1994-04-26 | 1995-01-24 | Premark Feg Corporation | Method of operating a warewasher drain valve |
| US5626327A (en) * | 1995-04-27 | 1997-05-06 | Borg-Warner Automotive, Inc. | Solenoid-driven valve having a roller bearing |
| DE19817740A1 (en) * | 1998-04-21 | 1999-10-28 | Pierburg Ag | Exhaust gas recirculation valve |
| DE19825583B4 (en) * | 1998-06-09 | 2014-04-03 | Gustav Wahler Gmbh U. Co Kg | Exhaust gas recirculation valve for internal combustion engines and method for operating such |
| JP3591317B2 (en) * | 1998-08-17 | 2004-11-17 | トヨタ自動車株式会社 | Exhaust gas recirculation valve forced drive for internal combustion engine |
| DE19910846A1 (en) * | 1999-03-11 | 2000-09-14 | Opel Adam Ag | Exhaust gas recirculation system for an internal combustion engine |
| EP1312786B1 (en) * | 2000-08-24 | 2010-11-17 | Mitsubishi Denki Kabushiki Kaisha | Exhaust gas recirculation valve controller |
| JP4396581B2 (en) * | 2005-06-02 | 2010-01-13 | 株式会社デンソー | EGR control device for internal combustion engine |
| KR101332557B1 (en) * | 2006-07-25 | 2013-11-22 | 보르그워너 인코퍼레이티드 | Control algorithm for freeing an egr valve from contamination adhesion |
| US8849548B2 (en) | 2011-11-21 | 2014-09-30 | Caterpillar Inc. | Anti-sticking and diagnostic strategy for exhaust system valves |
| GB2517166B (en) | 2013-08-13 | 2018-05-02 | Ford Global Tech Llc | A method and system of cleaning a control valve |
| GB2555437B (en) | 2016-10-27 | 2019-09-11 | Ford Global Tech Llc | A method of cleaning an exhaust gas recirculation valve |
| CN112648115B (en) * | 2020-12-24 | 2022-04-26 | 潍柴动力股份有限公司 | Engine EGR self-cleaning method and device |
-
1980
- 1980-09-30 JP JP55136050A patent/JPS5762954A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5762954A (en) | 1982-04-16 |
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