JPH07286603A - Actuator drive - Google Patents
Actuator driveInfo
- Publication number
- JPH07286603A JPH07286603A JP31022794A JP31022794A JPH07286603A JP H07286603 A JPH07286603 A JP H07286603A JP 31022794 A JP31022794 A JP 31022794A JP 31022794 A JP31022794 A JP 31022794A JP H07286603 A JPH07286603 A JP H07286603A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- actuator
- supply
- control
- 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.)
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Abstract
(57)【要約】
【目的】複数個の制御弁のうちいくつかの制御弁を動作
させ、その時のアクチュエータの圧力と正常に動作して
いる場合の圧力とを比較することにより、不良制御弁の
検出を簡単にする。
【構成】複数個の制御弁Ｖ11，Ｖ12，Ｖ21，Ｖ22の開閉
を切換えながら、アクチュエータ３の圧力Ｐを検出器４
で検出する。検出された圧力Ｐと供給圧力Ｐsとの関係
を多段階で評価することにより、各制御弁の正常／異常
を判定する。
(57) [Summary] [Purpose] A defective control valve is operated by operating some of the control valves and comparing the pressure of the actuator at that time with the pressure when operating normally. Make the detection of. [Structure] The pressure P of the actuator 3 is detected by switching the opening / closing of a plurality of control valves V 11 , V 12 , V 21 , and V 22 to the detector 4.
Detect with. The normality / abnormality of each control valve is determined by evaluating the relationship between the detected pressure P and the supply pressure Ps in multiple stages.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、アクチュエータの制御
装置に係り、特に複数個の弁により供給される圧力流体
の流入、排出により動作するアクチュエータの制御装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an actuator, and more particularly to a control device for an actuator which operates by inflow and discharge of a pressure fluid supplied by a plurality of valves.
【０００２】[0002]
【従来の技術】圧力流体の流入、排出により動作するア
クチュエータへの圧力流体の制御を行う制御装置とし
て、例えば１９８３年１１月７日発行の日経メカニカル
における杉本旭による“高精度の位置制御可能な空圧サ
ーボ”と題する文献において論じられているように、ア
クチュエータの接続管路の供給側と排出側とにそれぞれ
の制御弁を配設し、それぞれの制御弁を連動させて、ア
クチュエータの圧力を制御するものがある。2. Description of the Related Art As a control device for controlling pressure fluid to an actuator operated by inflow and discharge of pressure fluid, for example, "High-precision position control by Asahi Sugimoto in Nikkei Mechanical, issued November 7, 1983" As discussed in the article entitled "Pneumatic servo", control valves are provided on the supply side and the discharge side of the connection line of the actuator, and the control valves are linked to control the pressure of the actuator. There is something to control.
【０００３】[0003]
【発明が解決しようとする課題】前述した従来例のよう
に、制御弁を複数個配設した構成のものでは、制御弁の
故障する確率が増大し、システムの稼動率が低下すると
いう懸念が生ずる。As in the above-mentioned conventional example, in the structure in which a plurality of control valves are arranged, there is a concern that the probability of failure of the control valve increases and the operating rate of the system decreases. Occurs.
【０００４】そこで、故障した制御弁の早期発見が、シ
ステム稼動率の低下の防止策となる。また、この故障発
見を自動的に行う必要がある。ところが、制御弁を複数
個配設した場合、その内の１個が動作不良になっても、
他の正常な制御弁が動作不良の制御弁の不良状態を補っ
て、ほぼ正常な動作をするので、動作不良の制御弁を複
数個の制御弁の中から見つけ出すことは困難であるとい
う問題点があった。Therefore, early detection of a defective control valve is a measure for preventing a decrease in system operating rate. In addition, it is necessary to automatically detect this failure. However, when multiple control valves are provided, even if one of them fails to operate,
Another normal control valve compensates for the defective state of the malfunctioning control valve and operates almost normally, so it is difficult to find the malfunctioning control valve from a plurality of control valves. was there.
【０００５】本発明は上述の事柄に基づいてなされたも
ので、複数個の制御弁の中から、動作不良の制御弁を簡
単に見つけ出すことができるアクチュエータの制御装置
を提供することを目的とする。The present invention has been made on the basis of the above matters, and an object thereof is to provide an actuator control device capable of easily finding a malfunctioning control valve from a plurality of control valves. .
【０００６】[0006]
【課題を解決するための手段】本発明の上記の目的は、
アクチュエータの接続管路に少なくとも２つの圧力流体
供給側管路と少なくとも２つの圧力流体排出側管路とを
分岐して設け、前記各供給側管路と各排出側管路とにそ
れぞれ１個の制御弁Ｖ11，Ｖ12とＶ21，Ｖ22とを設け、
前記アクチュエータにその圧力を検出する圧力検出器を
設け、この検出器からの検出圧力と指令圧力とによって
前記制御弁を制御する制御手段を備えたアクチュエータ
の駆動装置において、前記制御手段は供給側の制御弁Ｖ
11，Ｖ12を閉、排出側の制御弁Ｖ21，Ｖ22を開動作させ
たときの圧力検出器からのアクチュエータ圧力が供給圧
力のほぼ１／２のときには供給側の制御弁Ｖ11，Ｖ12が
動作不良と判断し、前記アクチュエータ圧力が供給圧力
のほぼ１／３のときには供給側の制御弁Ｖ11を閉、供給
側の制御弁Ｖ12、排出側の制御弁Ｖ21，Ｖ22を開動作し
たときのアクチュエータ圧力が大気圧近傍のときに供給
側の制御弁Ｖ11が動作不良と判断し、またそのときのア
クチュエータ圧力が供給圧力のほぼ１／３のときに供給
側の制御弁Ｖ12が動作不良と判断し、さらに、前述した
アクチュエータ圧力が大気圧の近傍のときには、供給側
制御弁Ｖ11，Ｖ12を開、排出側の制御弁Ｖ11，Ｖ12を閉
動作したときのアクチュエータ圧力が供給圧力のほぼ１
／２のときに排出側の制御弁Ｖ21，Ｖ22が動作不良と判
断し、前述の弁動作時におけるアクチュエータ圧力が供
給圧力のほぼ２／３のときには、供給側の制御弁Ｖ11，
Ｖ12を開、排出側の制御弁Ｖ21を閉、排出側の制御弁Ｖ
22を開動作したときのアクチュエータ圧力が供給圧のほ
ぼ１／２のときには排出側の制御弁Ｖ21が動作不良と判
断し、またアクチュエータの供給圧のほぼ２／３のとき
には排出側の制御弁Ｖ22が動作不良と判断し、その結果
を出力することにより達成される。The above objects of the present invention are as follows.
At least two pressure fluid supply side pipelines and at least two pressure fluid discharge side pipelines are provided in a branched manner in the connection pipeline of the actuator, and one supply side pipeline and one discharge side pipeline are provided. The control valves V 11 , V 12 and V 21 , V 22 are provided,
In the actuator drive device provided with a pressure detector for detecting the pressure of the actuator, and the control means for controlling the control valve by the detected pressure and the command pressure from the detector, the control means is a supply side. Control valve V
When 11 and V 12 are closed and the discharge side control valves V 21 and V 22 are opened, when the actuator pressure from the pressure detector is approximately ½ of the supply pressure, the supply side control valves V 11 and V 12 determines that the operation is defective, and when the actuator pressure is approximately 1/3 of the supply pressure, the supply side control valve V 11 is closed, the supply side control valve V 12 and the discharge side control valves V 21 and V 22 are closed. When the actuator pressure at the time of the opening operation is near atmospheric pressure, it is judged that the control valve V 11 on the supply side has malfunctioned, and when the actuator pressure at that time is about 1/3 of the supply pressure, the control valve on the supply side. When V 12 is determined to be defective, and when the above-mentioned actuator pressure is near atmospheric pressure, the supply side control valves V 11 and V 12 are opened and the discharge side control valves V 11 and V 12 are closed. Actuator pressure is almost 1 of supply pressure
When the control valves V 21 and V 22 on the discharge side are judged to be malfunctioning at the time of / 2, and the actuator pressure at the time of the above-mentioned valve operation is approximately 2/3 of the supply pressure, the control valve V 11 on the supply side,
The V 12 open, closing the control valve V 21 on the discharge side, the discharge-side control valve V
When the actuator pressure when opening 22 is approximately 1/2 of the supply pressure, it is determined that the discharge side control valve V 21 is malfunctioning, and when it is approximately 2/3 of the actuator supply pressure, the discharge side control valve is This is achieved by determining that V 22 is malfunctioning and outputting the result.
【０００７】[0007]
【作用】制御手段は複数個の制御弁のうちいくつかの制
御弁を動作させ、その時のアクチュエータの圧力と制御
弁が正常に動作している場合の圧力とを比較することに
より動作不良の制御弁を検出し、その動作不良を指示す
る。The control means operates some of the plurality of control valves, and compares the pressure of the actuator at that time with the pressure when the control valve is operating normally to control the malfunction. Detect the valve and indicate its malfunction.
【０００８】[0008]
【実施例】以下本発明の実施例を図面を用いて説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【０００９】図１は本発明の制御装置の一例を備えたア
クチュエータの駆動装置の一例を示したもので、この図
において、１は本発明の制御手段を備えた制御装置、２
は制御弁群であり、供給側の制御弁Ｖ11，Ｖ12，Ｖ13…
Ｖ1nと排出側の制御弁Ｖ21，Ｖ22，Ｖ23……Ｖ2nとから
構成されている。また、これらの制御弁は例えばノーマ
ルオープン弁（コイルに電圧が印加されていない時、流
体路が開いている形式の弁）等で構成されている。３は
アクチュエータ、４はアクチュエータ３の圧力Ｐを検出
する圧力検出器で、この検出器４による検出圧力Ｐは制
御装置１に入力される。制御装置１には指令圧力値Ｐr
が入力される。FIG. 1 shows an example of an actuator drive device provided with an example of the control device of the present invention. In this figure, 1 is a control device provided with the control means of the present invention, and 2
Is a control valve group, and the supply side control valves V 11 , V 12 , V 13 ...
V 1n and discharge side control valves V 21 , V 22 , V 23 ... V 2n . These control valves are, for example, normally open valves (valves in which the fluid passage is open when no voltage is applied to the coil). 3 is an actuator, 4 is a pressure detector for detecting the pressure P of the actuator 3, and the pressure P detected by this detector 4 is input to the control device 1. The controller 1 has a command pressure value P r
Is entered.
【００１０】まず、通常のアクチュエータ３への圧力制
御について説明する。制御装置１は指令圧力Ｐrと圧力
検出器４からの検出圧力Ｐとの比較を行い、その差ΔＰ
が小さくなる方向に制御弁群２に信号を出力する。ここ
で、制御弁群２に出力する信号としては、圧力差ΔＰに
比例した電圧信号を出力する方法や、ＰＷＭ方式を用い
圧力差ΔＰに比例したパルス幅のＯＮ−ＯＦＦの電圧信
号を出力する方法が通常用いられている。First, the normal pressure control for the actuator 3 will be described. The control device 1 compares the command pressure P r with the detected pressure P from the pressure detector 4, and determines the difference ΔP.
A signal is output to the control valve group 2 in the direction in which becomes smaller. Here, as the signal output to the control valve group 2, a method of outputting a voltage signal proportional to the pressure difference ΔP, or an ON-OFF voltage signal of a pulse width proportional to the pressure difference ΔP using the PWM method is output. Methods are commonly used.
【００１１】次に、本発明の制御装置の動作例を図２〜
図４を用いて説明する。Next, an operation example of the control device of the present invention will be described with reference to FIGS.
This will be described with reference to FIG.
【００１２】この動作例は、制御弁群２が制御弁Ｖ11，
Ｖ12と制御弁Ｖ21，Ｖ22の４個の制御弁で構成されてい
る場合である。図２は制御手順を示すフローチャートで
あり、図３の(a)〜(h)は制御弁Ｖ11，Ｖ12，Ｖ21，Ｖ22
の状態を示したものである。In this operation example, the control valve group 2 controls the control valves V 11 ,
This is a case where it is composed of four control valves of V 12 and control valves V 21 and V 22 . FIG. 2 is a flowchart showing a control procedure, and (a) to (h) of FIG. 3 show control valves V 11 , V 12 , V 21 , V 22.
It shows the state of.
【００１３】図３(a)においてＰsは供給圧力、制御弁記
号のＸは流体路が閉じている場合、ｘは流体路が開いて
いる場合である。また、Ｐはアクチュエータ３の圧力を
示し、０は大気圧を示す。In FIG. 3 (a), Ps is the supply pressure, X of the control valve symbol is when the fluid passage is closed, and x is when the fluid passage is open. Further, P indicates the pressure of the actuator 3, and 0 indicates the atmospheric pressure.
【００１４】図４は圧力Ｐに対する図３の(a)〜(h)に示
す制御弁の状態を示したもので、この制御弁の状態を図
番の符号にて表示する。ただし、説明を簡単にするため
各制御弁の開状態での圧力損失、および各制御弁間の配
管抵抗は等しいとし、かつ管路抵抗と圧力損失は正比例
するものとした。FIG. 4 shows the state of the control valve shown in FIGS. 3 (a) to 3 (h) with respect to the pressure P. The state of this control valve is indicated by the reference numeral. However, in order to simplify the explanation, it is assumed that the pressure loss in the open state of each control valve and the pipe resistance between the control valves are equal, and the pipe line resistance and the pressure loss are directly proportional.
【００１５】まず、手順２０で供給側の制御弁Ｖ11，Ｖ
12をＯＮし、排出側の制御弁Ｖ21，Ｖ22をＯＦＦする。
次に、手順２１でアクチュエータ３の圧力Ｐを調べる。
ここで、手順２０を実行すると、制御弁の状態は図３の
(a)〜(d)のいずれかになる。すなわち、図３(a)は各制
御弁Ｖ11，Ｖ12，Ｖ21，Ｖ22が正常に動作した場合であ
り、その時の圧力Ｐはほぼ大気圧になる。図３(d)に示
す場合は、制御弁Ｖ11，Ｖ12がＯＮしなかった場合であ
り、その時の圧力Ｐはほぼ１／２Ｐsになる。また、図
３の(b)，(c)の場合は、制御弁Ｖ11，Ｖ12のいずれかが
ＯＮしなかった場合であり、その時の圧力Ｐはほぼ１／
３Ｐsとなる。First, in step 20, the supply side control valves V 11 , V
12 is turned on, and the discharge side control valves V 21 and V 22 are turned off.
Next, in step 21, the pressure P of the actuator 3 is checked.
Here, when the procedure 20 is executed, the state of the control valve is as shown in FIG.
It will be one of (a) to (d). That is, FIG. 3A shows the case where the control valves V 11 , V 12 , V 21 , and V 22 are normally operated, and the pressure P at that time is almost atmospheric pressure. In the case shown in FIG. 3D, the control valves V 11 and V 12 are not turned on, and the pressure P at that time is approximately 1/2 Ps. In the case of (b) and (c) of FIG. 3, the control valves V 11 and V 12 are not turned on, and the pressure P at that time is about 1 /.
It will be 3 Ps.
【００１６】そこで、手順２１で圧力Ｐの値を調べ、制
御弁Ｖ11，Ｖ12，Ｖ21，Ｖ22の状態が図３の(a)〜(h)の
どの状態であるかを判断する。Therefore, in step 21, the value of the pressure P is examined to determine which of the states (a) to (h) of FIG. 3 the control valves V 11 , V 12 , V 21 , V 22 are in. .
【００１７】まず、圧力Ｐが１／２Ｐsの近傍であった
なら、手順２２に移り、制御弁Ｖ11，Ｖ12が動作不良で
あることを外部へ出力する。First, if the pressure P is in the vicinity of 1/2 Ps, the procedure proceeds to step 22, and the fact that the control valves V 11 and V 12 are malfunctioning is output to the outside.
【００１８】圧力Ｐが１／３Ｐsの近傍であったなら、
制御弁Ｖ11，Ｖ12のどちらかの制御弁が動作不良である
ので、以下に示す手順により調査する。手順２３で制御
弁Ｖ11をＯＮし、制御弁Ｖ12，Ｖ21，Ｖ22をＯＦＦす
る。そして、手順２４で圧力Ｐを調べる。制御弁Ｖ11が
動作不良であれば、図３(d)の状態となり、制御弁Ｖ12
が動作不良であれば、図３(c)の状態となるので、圧力
Ｐが大気圧の近傍であったなら、手順２５に移り、制御
弁Ｖ11が動作不良であることを外部へ出力する。また、
圧力Ｐが１／３Ｐsの近傍であったなら、手順２６に移
り、制御弁Ｖ12が動作不良であることを外部へ出力す
る。If the pressure P is in the vicinity of 1/3 Ps,
Since one of the control valves V 11 and V 12 is malfunctioning, the investigation is performed by the following procedure. In step 23, the control valve V 11 is turned on and the control valves V 12 , V 21 and V 22 are turned off. Then, in step 24, the pressure P is checked. If the control valve V 11 is a malfunction, a state of FIG. 3 (d), the control valve V 12
3 is in the state of FIG. 3 (c), the procedure goes to step 25 if the pressure P is in the vicinity of the atmospheric pressure, and the control valve V 11 is output to the outside to indicate that it is not in operation. . Also,
If the pressure P is in the vicinity of 1/3 Ps, the procedure proceeds to step 26, and the fact that the control valve V 12 is malfunctioning is output to the outside.
【００１９】さらに、手順２１において、圧力Ｐが大気
圧の近傍であった場合は、制御弁Ｖ11，Ｖ12の動作は良
好であるので、制御弁Ｖ21，Ｖ22をチェックする手順２
７〜３４へ移り、手順２０〜２６と同様の手順を制御弁
Ｖ21，Ｖ22について行い、制御弁Ｖ21，Ｖ22の動作チェ
ックを行う。Further, in the procedure 21, when the pressure P is near the atmospheric pressure, the operation of the control valves V 11 and V 12 is good, so the procedure 2 of checking the control valves V 21 and V 22 is performed.
Moves to 7-34, the same procedure as 20 to 26 for the control valve V 21, V 22, performs the operation check of the control valve V 21, V 22.
【００２０】なお、上記の実施例では、２組の制御弁に
ついて例を示したが、ｎ組の制御弁についても同様の制
御方式を用いることが可能である。In the above embodiment, two control valves are shown as an example, but the same control method can be used for n control valves.
【００２１】また、上記の実施例では流体の種類を述べ
てないが、水圧、油圧、空圧のいずれの流体に対しても
本発明を用いることが可能である。Although the type of fluid is not described in the above embodiment, the present invention can be applied to any fluid of hydraulic pressure, hydraulic pressure and pneumatic pressure.
【００２２】さらに、上記の実施例では、最初供給側の
制御弁を動作させ、圧力のチェックを行ったが、最初排
出側の制御弁を動作させても、また、供給、排出の制御
弁を同時に動作させてもよい。Further, in the above-mentioned embodiment, the control valve on the supply side is operated first to check the pressure. However, even if the control valve on the discharge side is operated first, the control valve for the supply / discharge is still operated. You may operate simultaneously.
【００２３】[0023]
【発明の効果】以上述べたように、本発明によれば複数
個の制御弁の中から、動作不良の制御弁を簡単に見つけ
出すことができるので、故障発見に要する時間を短かく
することができ、ひいてはシステムの稼動率を向上させ
ることができる。As described above, according to the present invention, it is possible to easily find a malfunctioning control valve from among a plurality of control valves, so that it is possible to shorten the time required to find a failure. Therefore, the operating rate of the system can be improved.
【図１】本発明の制御装置の一例を備えたアクチュエー
タの駆動装置の一例を示す図である。FIG. 1 is a diagram showing an example of a drive device for an actuator including an example of a control device of the present invention.
【図２】本発明の制御装置の制御手順の一例を示すフロ
ーチャート図である。FIG. 2 is a flowchart showing an example of a control procedure of the control device of the present invention.
【図３】本発明によって制御される制御弁の状態を示す
図である。FIG. 3 is a diagram showing a state of a control valve controlled by the present invention.
【図４】アクチュエータの圧力と制御弁の関係を示す特
性図である。FIG. 4 is a characteristic diagram showing a relationship between a pressure of an actuator and a control valve.
１…制御装置、２…制御弁、３…アクチュエータ、４…
圧力検出器。1 ... Control device, 2 ... Control valve, 3 ... Actuator, 4 ...
Pressure detector.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹内 郁雄 茨城県土浦市神立町502番地 株式会社日 立製作所機械研究所内 (72)発明者 酒井 昭彦 茨城県土浦市神立町502番地 株式会社日 立製作所機械研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Ikuo Takeuchi Ikuo Takeuchi, 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Seisakusho Co., Ltd. Inside the mechanical laboratory
Claims (1)
つの圧力流体供給側管路と少なくとも２つの圧力流体排
出側管路とを分岐して設け、前記各供給側管路と各排出
側管路とにそれぞれ１個の制御弁Ｖ11，Ｖ12とＶ21，Ｖ
22とを設け、前記アクチュエータにその圧力を検出する
圧力検出器を設け、この検出器からの検出圧力と指令圧
力とによって前記制御弁を制御する制御手段を備えたア
クチュエータの駆動装置において、 前記制御手段は供給側の制御弁Ｖ11，Ｖ12を閉、排出側
の制御弁Ｖ21，Ｖ22を開動作させたときの圧力検出器か
らのアクチュエータ圧力が供給圧力のほぼ１／２のとき
には供給側の制御弁Ｖ11，Ｖ12が動作不良と判断し、前
記アクチュエータ圧力が供給圧力のほぼ１／３のときに
は供給側の制御弁Ｖ11を閉、供給側の制御弁Ｖ12，排出
側の制御弁Ｖ21，Ｖ22を開動作したときのアクチュエー
タ圧力が大気圧近傍のときに供給側の制御弁Ｖ11が動作
不良と判断し、またそのときのアクチュエータ圧力が供
給圧力のほぼ１／３のときに供給側の制御弁Ｖ12が動作
不良と判断し、さらに、前述したアクチュエータ圧力が
大気圧の近傍のときには、供給側制御弁Ｖ11，Ｖ12を
開、排出側の制御弁Ｖ11，Ｖ12を閉動作したときのアク
チュエータ圧力が供給圧力のほぼ１／２のときに排出側
の制御弁Ｖ21，Ｖ22が動作不良と判断し、前述の弁動作
時におけるアクチュエータ圧力が供給圧力のほぼ２／３
のときには、供給側の制御弁Ｖ11，Ｖ12を開、排出側の
制御弁Ｖ21を閉、排出側の制御弁Ｖ22を開動作したとき
のアクチュエータ圧力が供給圧のほぼ１／２のときには
排出側の制御弁Ｖ21が動作不良と判断し、またアクチュ
エータの供給圧のほぼ２／３のときには排出側の制御弁
Ｖ22が動作不良と判断し、その結果を出力することを特
徴とするアクチュエータの駆動装置。1. At least two actuator connecting lines.
One pressure fluid supply side pipeline and at least two pressure fluid discharge side pipelines are provided in a branched manner, and one control valve V 11 , V 12 is provided in each of the supply side pipeline and each discharge side pipeline. V 21 , V
22 is provided, the actuator is provided with a pressure detector for detecting the pressure, and the actuator drive device including control means for controlling the control valve according to the detected pressure from this detector and the command pressure, The means supplies when the actuator pressure from the pressure detector when the control valves V 11 and V 12 on the supply side are closed and the control valves V 21 and V 22 on the discharge side are opened is approximately ½ of the supply pressure. It is judged that the control valves V 11 and V 12 on the side are malfunctioning, and when the actuator pressure is approximately ⅓ of the supply pressure, the control valve V 11 on the supply side is closed, the control valve V 12 on the supply side and the control valve V 12 on the discharge side are closed. When the actuator pressure when the control valves V 21 and V 22 are opened is close to the atmospheric pressure, it is determined that the supply side control valve V 11 is malfunctioning, and the actuator pressure at that time is approximately 1/3 of the supply pressure. Supply when Determines that the control valve V 12 is malfunctioning, further, when the actuator pressure as described above is in the vicinity of atmospheric pressure, the supply-side control valve V 11, V 12 open, the control valve V 11, V 12 on the discharge side closed When the actuator pressure when operating is about 1/2 of the supply pressure, it is determined that the discharge side control valves V 21 and V 22 are malfunctioning, and the actuator pressure during the above-mentioned valve operation is about 2/3 of the supply pressure.
In the case of, the actuator pressure when the control valves V 11 and V 12 on the supply side are opened, the control valve V 21 on the discharge side is closed, and the control valve V 22 on the discharge side is opened is approximately ½ of the supply pressure. The control valve V 21 on the discharge side is sometimes judged to be malfunctioning, and the control valve V 22 on the discharge side is judged to be malfunctioning when the supply pressure of the actuator is approximately ⅔, and the result is output. Actuator driving device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31022794A JPH07286603A (en) | 1994-12-14 | 1994-12-14 | Actuator drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31022794A JPH07286603A (en) | 1994-12-14 | 1994-12-14 | Actuator drive |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60208612A Division JPH0762482B2 (en) | 1985-09-24 | 1985-09-24 | Actuator control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07286603A true JPH07286603A (en) | 1995-10-31 |
Family
ID=18002726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31022794A Pending JPH07286603A (en) | 1994-12-14 | 1994-12-14 | Actuator drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07286603A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016065637A (en) * | 2014-09-24 | 2016-04-28 | キャタピラー エス エー アール エル | Fault diagnosis system of control valve in hydraulic circuit |
| JP2016070488A (en) * | 2015-06-25 | 2016-05-09 | キャタピラー エス エー アール エル | Fault diagnosis system of control valve in hydraulic circuit |
| JP2017101790A (en) * | 2015-12-04 | 2017-06-08 | 日立建機株式会社 | Control device for work machine |
-
1994
- 1994-12-14 JP JP31022794A patent/JPH07286603A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016065637A (en) * | 2014-09-24 | 2016-04-28 | キャタピラー エス エー アール エル | Fault diagnosis system of control valve in hydraulic circuit |
| US10253482B2 (en) | 2014-09-24 | 2019-04-09 | Caterpillar Sarl | Control valve diagnostic system in hydraulic circuit |
| JP2016070488A (en) * | 2015-06-25 | 2016-05-09 | キャタピラー エス エー アール エル | Fault diagnosis system of control valve in hydraulic circuit |
| JP2017101790A (en) * | 2015-12-04 | 2017-06-08 | 日立建機株式会社 | Control device for work machine |
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