JPH0558912U - Failure diagnosis device for accumulator in pressure source for pressure equipment - Google Patents
Failure diagnosis device for accumulator in pressure source for pressure equipmentInfo
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- JPH0558912U JPH0558912U JP84891U JP84891U JPH0558912U JP H0558912 U JPH0558912 U JP H0558912U JP 84891 U JP84891 U JP 84891U JP 84891 U JP84891 U JP 84891U JP H0558912 U JPH0558912 U JP H0558912U
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- pressure
- accumulator
- predetermined
- solenoid valve
- response
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- Fluid-Pressure Circuits (AREA)
Abstract
(57)【要約】
〔目的〕部品点数の増大を回避しながら高精度で蓄圧器
の故障を検出する。
〔構成〕制御装置Ｃは、駆動制御手段５０が駆動停止信
号を出力した後に常閉型電磁弁ＶC を第１所定時間だけ
励磁する第１励磁手段５１と、前記電磁弁ＶC の励磁終
了後に圧力検出器Ｓの検出圧力が第１所定圧力以下とな
るのに応じて蓄圧器ＡＣが故障であると判断する判断手
段５３とを備え、第１所定時間は、正常である蓄圧器Ａ
Ｃの圧力が常閉型電磁弁ＶC の開弁に応じて第２所定圧
力以上の所定圧力から第１所定圧力に低下するまでの時
間よりも短く設定される。
(57) [Summary] [Purpose] Accurately detect a failure of the accumulator while avoiding an increase in the number of parts. [Structure] The control device C includes the first excitation means 51 for exciting the normally closed solenoid valve V C for the first predetermined time after the drive control means 50 outputs the drive stop signal, and the end of excitation of the solenoid valve V C. The pressure accumulator A, which is normal during the first predetermined time, is provided with a judgment unit 53 that judges that the pressure accumulator AC is out of order when the pressure detected by the pressure detector S becomes equal to or lower than the first predetermined pressure.
The pressure of C is set shorter than the time required for the pressure of C to decrease from the predetermined pressure equal to or higher than the second predetermined pressure to the first predetermined pressure in response to the opening of the normally closed solenoid valve V C.
Description
【０００１】[0001]
本考案は、液体タンクから液体を汲上げるポンプと、該ポンプおよび圧力機器 に接続される蓄圧器と、前記蓄圧器の圧力を検出する圧力検出器と、前記圧力機 器と蓄圧器または液体タンクとの間に介設される常閉型電磁弁と、前記圧力検出 器の検出圧力が第１所定圧力以下となるのに応じて前記ポンプを作動せしめるた めの駆動信号を出力するとともに前記検出圧力が第１所定圧力よりも高い第２所 定圧力以上となるのに応じて前記ポンプの作動を停止せしめるための駆動停止信 号を出力する駆動制御手段を含む制御装置（Ｃ）とを備える圧力機器用圧力源に おいて、蓄圧器の故障を診断するための装置に関する。 The present invention provides a pump for pumping liquid from a liquid tank, a pressure accumulator connected to the pump and the pressure device, a pressure detector for detecting the pressure of the pressure accumulator, the pressure device and the pressure accumulator or the liquid tank. And a normally-closed solenoid valve interposed between the pressure detector and the pressure detector, which outputs a drive signal for operating the pump when the pressure detected by the pressure detector becomes equal to or lower than a first predetermined pressure and outputs the detection signal. And a control device (C) including drive control means for outputting a drive stop signal for stopping the operation of the pump when the pressure becomes equal to or higher than a second predetermined pressure higher than the first predetermined pressure. The present invention relates to a device for diagnosing a failure of a pressure accumulator in a pressure source for pressure equipment.
【０００２】[0002]
かかる圧力機器用圧力源は、たとえば特開平２−２７９４４９号公報で開示さ れた車両用制動油圧制御装置等で用いられており、蓄圧器が故障して充分な圧力 を確保できなくなると圧力機器の性能保証が困難となるので、蓄圧器の故障を監 視しておく必要がある。このため、従来では、蓄圧器におけるピストンの位置 を検出したり、蓄圧器における背圧室の圧力を常時監視したり、蓄圧器の昇 圧時間を検出したりしている。 Such a pressure source for a pressure device is used, for example, in a vehicle braking hydraulic pressure control device disclosed in Japanese Patent Laid-Open No. 2-279449. When the pressure accumulator fails to secure a sufficient pressure, the pressure device is not used. Since it will be difficult to guarantee the performance of the accumulator, it is necessary to monitor the failure of the accumulator. Therefore, conventionally, the position of the piston in the pressure accumulator is detected, the pressure of the back pressure chamber in the pressure accumulator is constantly monitored, and the pressure rising time of the pressure accumulator is detected.
【０００３】[0003]
ところが、上記従来のおよびのものは、検出器が必要であって部品点数が 増大するとともにコスト大となり、しかも技術的に難しいものである。また上記 のものでは高精度で故障を検出することが困難である。 However, the conventional and the above-mentioned ones require a detector, the number of parts is increased, the cost is increased, and it is technically difficult. In addition, it is difficult to detect failures with high accuracy with the above.
【０００４】 本考案は、かかる事情に鑑みてなされたものであり、上記従来の技術的課題を 解決して簡単な構成で蓄圧器の故障を検出し得るようにした圧力機器用圧力源に おける蓄圧器の故障診断装置を提供することを目的とする。The present invention has been made in view of the above circumstances, and provides a pressure source for a pressure device that solves the above-mentioned conventional technical problems and can detect a failure of a pressure accumulator with a simple configuration. An object of the present invention is to provide a failure diagnosis device for a pressure accumulator.
【０００５】[0005]
上記目的を達成するために、本考案の第１の特徴によれば、制御装置は、駆動 制御手段が駆動停止信号を出力した後に前記電磁弁を第１所定時間だけ励磁する 第１励磁手段と、前記電磁弁の励磁終了後に圧力検出器の検出圧力が第１所定圧 力以下となるのに応じて蓄圧器が故障であると判断する判断手段とを備え、第１ 所定時間は、正常である蓄圧器の圧力が常閉型電磁弁の開弁に応じて第２所定圧 力以上の所定圧力から第１所定圧力に低下するまでの時間よりも短く設定される 。 In order to achieve the above object, according to a first aspect of the present invention, a control device includes a first excitation means for exciting the solenoid valve for a first predetermined time after the drive control means outputs a drive stop signal. And a means for judging that the pressure accumulator is in failure when the pressure detected by the pressure detector becomes equal to or lower than the first predetermined pressure after the completion of the excitation of the solenoid valve, and the first predetermined time is normal. The pressure of a certain accumulator is set to be shorter than the time required to decrease from a predetermined pressure equal to or higher than the second predetermined pressure to the first predetermined pressure in response to opening of the normally closed solenoid valve.
【０００６】 また本考案の第２の特徴によれば、上記第１の特徴の構成に加えて、前記制御 装置は、手動操作に応じて起動信号を発生する起動信号発生手段の操作に応答し て前記常閉型電磁弁を第２所定時間だけ励磁する第２励磁手段を備え、第２所定 時間は、正常である蓄圧器の圧力が常閉型電磁弁の開弁に応じて第２の所定圧力 以上の所定圧力から第１の所定圧力に低下するまでの時間よりも短く設定される 。According to a second feature of the present invention, in addition to the configuration of the first feature, the control device responds to an operation of an activation signal generating means for generating an activation signal in response to a manual operation. And a second exciting means for exciting the normally closed solenoid valve for a second predetermined time. During the second predetermined time, the pressure of the accumulator that is normal is set to a second value according to the opening of the normally closed solenoid valve. The time is set to be shorter than the time required to decrease from the predetermined pressure equal to or higher than the predetermined pressure to the first predetermined pressure.
【０００７】 本考案の第３の特徴によれば、上記第２の特徴の構成に加えて、前記制御装置 は、前記起動信号発生手段からの起動信号発生時に前記圧力検出器の検出圧力が 第１所定圧力以下となっているときには第２励磁手段を不作動とする第１不作動 手段を備える。According to a third aspect of the present invention, in addition to the configuration of the second aspect, the control device controls the pressure detected by the pressure detector when the activation signal is generated from the activation signal generating means. A first deactivating means is provided for deactivating the second exciting means when the pressure is equal to or lower than one predetermined pressure.
【０００８】 本考案の第４の特徴によれば、上記第１の特徴の構成に加えて、前記制御装置 は、手動操作に応じて起動信号を発生する起動信号発生手段の操作に応答して前 記圧力検出器の検出圧力が第１所定圧力以下となるまで前記電磁弁を励磁する第 ３励磁手段を備える。According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the control device is responsive to an operation of an activation signal generating means for generating an activation signal in response to a manual operation. A third excitation means is provided for exciting the solenoid valve until the pressure detected by the pressure detector becomes equal to or lower than the first predetermined pressure.
【０００９】 本考案の第５の特徴によれば、上記第２または第４の特徴の構成に加えて、前 記制御装置は、前記起動信号発生手段からの起動信号発生から所定時間が経過す るまで以外には第１励磁手段を不作動とする第２不作動手段を備える。According to a fifth feature of the present invention, in addition to the configuration of the second or fourth feature, the control device is configured such that a predetermined time elapses after the activation signal is generated from the activation signal generating means. The second deactivating means for deactivating the first exciting means is provided in addition to the above.
【００１０】 本考案の第６の特徴によれば、上記第４の特徴の構成に加えて、前記制御装置 は、前記起動信号発生手段からの起動信号発生時に前記圧力検出器の検出圧力が 第１所定圧力以下となっているときには第３励磁手段を不作動とする第３不作動 手段を備える。According to a sixth feature of the present invention, in addition to the configuration of the fourth feature, the control device controls the pressure detected by the pressure detector when the activation signal is generated from the activation signal generating means. A third deactivating means is provided for deactivating the third exciting means when the pressure is equal to or lower than one predetermined pressure.
【００１１】 本考案の第７の特徴によれば、上記第１，第２，第３，第４，第５または第６ の特徴の構成に加えて、蓄圧器は、シリンダ体と、該シリンダ体に摺動自在に嵌 合されるピストンの両面との間に、ポンプおよび圧力機器に接続される蓄圧室と ガスが封入されるガス室とが画成されて成る。According to a seventh aspect of the present invention, in addition to the configuration of the first, second, third, fourth, fifth or sixth aspect, the pressure accumulator includes a cylinder body and the cylinder body. A pressure accumulating chamber connected to the pump and the pressure device and a gas chamber in which gas is sealed are defined between the piston and the both surfaces slidably fitted to the body.
【００１２】[0012]
以下、図面により本考案を自動車のブレーキ装置用圧力源に適用したときの実 施例について説明する。 An example of applying the present invention to a pressure source for an automobile brake device will be described below with reference to the drawings.
【００１３】 図１ないし図６は本考案の一実施例を示すものであり、図１は自動車用ブレー キ装置の油圧系統図、図２は蓄圧器の縦断面図、図３は蓄圧器の蓄圧作動特性図 、図４は圧力検出器の検出範囲を示す図、図５は制御装置の要部構成を示す回路 図、図６は制御装置の制御手順を示すフローチャートである。1 to 6 show an embodiment of the present invention. FIG. 1 is a hydraulic system diagram of a vehicle brake device, FIG. 2 is a longitudinal sectional view of a pressure accumulator, and FIG. 3 is a pressure accumulator. FIG. 4 is a diagram showing a pressure accumulation operation characteristic, FIG. 4 is a diagram showing a detection range of a pressure detector, FIG. 5 is a circuit diagram showing a main configuration of a control device, and FIG. 6 is a flowchart showing a control procedure of the control device.
【００１４】 先ず図１において、ブレーキペダル１はマスタシリンダＭＣに対して作動的に 連結されており、マスタシリンダＭＣの出力油圧は圧力機器としてのモジュレー タ２を介して車輪ブレーキＢに伝達される。First, in FIG. 1, a brake pedal 1 is operatively connected to a master cylinder MC, and an output hydraulic pressure of the master cylinder MC is transmitted to a wheel brake B via a modulator 2 as a pressure device. ..
【００１５】 車輪ブレーキＢにおいて、制動油室５には油路４が連通されており、油路４か ら制動油室５に油圧が供給されることにより、ブレーキピストン６，７が相互に 離反する方向に作動して、ブレーキシュー８，９がそれぞれブレーキドラム（図 示せず）に接触して制動トルクを発生する。In the wheel brake B, the oil passage 4 is communicated with the braking oil chamber 5, and when the oil pressure is supplied from the oil passage 4 to the braking oil chamber 5, the brake pistons 6 and 7 are separated from each other. The brake shoes 8 and 9 come into contact with a brake drum (not shown) to generate a braking torque.
【００１６】 制動油室５内の制動油圧が大き過ぎると、各ブレーキシュー８，９とブレーキ ドラムとの間に発生する制動トルクが大きくなり過ぎ、その結果、車輪がロック 状態となる。このため、車輪がロック状態に入りそうになると、モジュレータ２ により制動油圧が減圧され、それによって車輪がロック状態となることが回避さ れる。If the braking hydraulic pressure in the braking oil chamber 5 is too large, the braking torque generated between the brake shoes 8 and 9 and the brake drum becomes too large, and as a result, the wheels are locked. Therefore, when the wheels are about to enter the locked state, the modulator 2 reduces the braking hydraulic pressure, thereby avoiding the locked state of the wheels.
【００１７】 モジュレータ２は、両端が閉塞された円筒状に形成されるとともに軸方向中間 部が隔壁１０で仕切られたハウジング１１と、両端部にそれぞれピストン１２， １３を有するとともに両ピストン１２，１３間の部分で隔壁１０を軸方向に滑接 自在に貫通するロッド１４とを備える。隔壁１０と一方のピストン１２との間に 形成される一次制動油圧室１５は、油路３を介してマスタシリンダＭＣに連通さ れる。また前記隔壁１０と他方のピストン１３との間に形成される二次制動油圧 室１６は、油路４を介して前記制動油室５に連通される。ハウジング１１の一方 の端壁と一方のピストン１２との間にはアンチロック制御油圧室１７が画成され 、ハウジング１１の他方の端壁と他方のピストン１３との間には解放油室１８が 画成され、解放油室１８はマスタシリンダＭＣのリザーバＲに連通される。また 二次制動油圧室１６にはピストン１３を隔壁１０から離反する方向に付勢するば ね１９が収納され、アンチロック制御油圧室１７にはピストン１２を隔壁１０側 に向けて付勢するばね２０が収納される。The modulator 2 has a housing 11 which is formed in a cylindrical shape with both ends closed and has an axially intermediate portion partitioned by a partition wall 10, and pistons 12 and 13 at both ends, and both pistons 12 and 13 respectively. And a rod 14 that penetrates the partition wall 10 in the axial direction so as to be slidable in the axial direction. A primary braking hydraulic chamber 15 formed between the partition wall 10 and one piston 12 is communicated with the master cylinder MC via an oil passage 3. A secondary braking hydraulic chamber 16 formed between the partition wall 10 and the other piston 13 is communicated with the braking oil chamber 5 via an oil passage 4. An anti-lock control hydraulic chamber 17 is defined between one end wall of the housing 11 and one piston 12, and a release oil chamber 18 is defined between the other end wall of the housing 11 and the other piston 13. The release oil chamber 18 is defined and communicates with the reservoir R of the master cylinder MC. Further, the secondary braking hydraulic chamber 16 accommodates a spring 19 for urging the piston 13 in a direction away from the partition wall 10, and the anti-lock control hydraulic chamber 17 has a spring for urging the piston 12 toward the partition wall 10 side. 20 is stored.
【００１８】 アンチロック制御油圧室１７には油路２１が接続されており、この油路２１は 圧力源２２に接続される。而して該圧力源２２は、液体タンクとしての油タンク Ｔから作動油を汲上げるポンプＰと、該ポンプＰに接続される蓄圧器ＡＣと、前 記蓄圧器ＡＣの圧力を検出する圧力検出器Ｓと、前記モジュレータ２に連なる油 路２１および蓄圧器ＡＣ間に介設される常閉型電磁弁ＶC と、前記油タンクＴお よび油路２１間に介設される常開型電磁弁ＶO と、ポンプＰに連結されたモータ Ｍのオン・オフ作動ならびに両電磁弁ＶC ，ＶO の開閉作動を制御する制御装置 Ｃとを備える。An oil passage 21 is connected to the anti-lock control hydraulic chamber 17, and the oil passage 21 is connected to a pressure source 22. The pressure source 22 includes a pump P for pumping hydraulic oil from an oil tank T as a liquid tank, a pressure accumulator AC connected to the pump P, and pressure detection for detecting the pressure of the pressure accumulator AC. Device S, a normally closed solenoid valve V C provided between the oil passage 21 connected to the modulator 2 and the pressure accumulator AC, and a normally open solenoid valve provided between the oil tank T and the oil passage 21. A valve V O and a controller C for controlling the on / off operation of the motor M connected to the pump P and the opening / closing operation of both solenoid valves V C and V O are provided.
【００１９】 図２において、蓄圧器ＡＣは、一端を閉塞した有底円筒状に形成されるととも にその他端が蓋部材２２で閉塞されて成るシリンダ体２３と、該シリンダ体２３ に摺動自在に嵌合されるピストン２４とを備え、蓋部材２２およびピストン２４ 間に蓄圧室２５が画成され、シリンダ体２３の一端およびピストン２４間にはガ ス室２６が画成される。ピストン２４の外面には、シリンダ体２３の内面に摺接 する一対の環状シール部材２７，２８が嵌着される。また蓋部材２２には蓄圧室 ２５に通じる接続管２９が接続されており、該接続管２９はポンプＰに接続され るとともに常閉型電磁弁ＶC を介して油路２１に接続される。さらにガス室２６ 内には、ガスが封入されるものであり、シリンダ体２３の一端の閉塞端にはガス を封入するための孔３０が穿設されており、該孔３０はプラグ３１で開閉可能に 閉塞される。しかもプラグ３１には拡径頭部３１ａが設けられており、この拡径 頭部３１ａとシリンダ体２３の一端外面との間には環状のシール部材３２が介装 される。In FIG. 2, a pressure accumulator AC is formed into a cylindrical shape with a bottom having one end closed and the other end closed with a lid member 22, and a cylinder body 23 that slides on the cylinder body 23. A pressure accumulating chamber 25 is defined between the lid member 22 and the piston 24, and a gas chamber 26 is defined between one end of the cylinder body 23 and the piston 24. On the outer surface of the piston 24, a pair of annular seal members 27, 28 which are in sliding contact with the inner surface of the cylinder body 23 are fitted. A connecting pipe 29 leading to the pressure accumulating chamber 25 is connected to the lid member 22. The connecting pipe 29 is connected to the pump P and also to the oil passage 21 via the normally closed solenoid valve V C. Further, gas is enclosed in the gas chamber 26, and a hole 30 for enclosing gas is formed at one closed end of the cylinder body 23. The hole 30 is opened and closed by a plug 31. Can be blocked. Moreover, the plug 31 is provided with a diameter-expanding head 31a, and an annular seal member 32 is interposed between the diameter-expanding head 31a and the outer surface at one end of the cylinder body 23.
【００２０】 このような蓄圧器ＡＣにおいて、ガス室２６からのガス抜けがなく正常に作動 している場合には、図３の曲線Ａで示すように蓄圧室２５の圧力が変化するのに 対し、ガス室２６から少量のガス抜けが生じている故障状態では図３の曲線Ｂで 示すように蓄圧室２５の圧力が変化し、さらにガス室２６から多量のガス抜けが 生じている故障状態では図３の曲線Ｃで示すように蓄圧室２５の圧力が変化する 。In such a pressure accumulator AC, when the gas is not leaked from the gas chamber 26 and is operating normally, the pressure in the pressure accumulator 25 changes as shown by the curve A in FIG. In a failure state in which a small amount of gas escapes from the gas chamber 26, the pressure in the accumulator chamber 25 changes as shown by the curve B in FIG. 3, and in a failure state in which a large amount of gas escape from the gas chamber 26 occurs. As shown by the curve C in FIG. 3, the pressure in the pressure accumulating chamber 25 changes.
【００２１】 また圧力検出器Ｓは、図４で示すように、蓄圧器ＡＣにおける蓄圧室２５の圧 力がその圧力上昇時に予め定めた第２所定圧力Ｐ2 を超えるのに応じて導通する とともに圧力下降時には第２所定圧力Ｐ2 よりも低い第１所定圧力Ｐ1 以下とな るのに応じて遮断する圧力スイッチである。Further, as shown in FIG. 4, the pressure detector S conducts electricity when the pressure of the pressure accumulating chamber 25 in the pressure accumulator AC exceeds a predetermined second predetermined pressure P 2 when the pressure rises. It is a pressure switch that shuts off when the pressure falls below the first predetermined pressure P 1 which is lower than the second predetermined pressure P 2 .
【００２２】 而して、蓄圧器２５が正常に作動している曲線Ａの状態では蓄圧室２５の圧力 が第１の所定圧力Ｐ1 から第２の所定圧力Ｐ2 に達するまでの時間あるいは蓄圧 量に対応する幅が比較的大きなＷA であるのに対し、ガス室２６から少量のガス 抜けが生じている曲線Ｂの故障状態では前記幅ＷB が比較的小さくなり、さらに ガス室２６から多量のガス抜けが生じている曲線Ｃの故障状態では前記幅ＷC が さらに小さくなる。Thus, in the state of the curve A in which the pressure accumulator 25 is operating normally, the time until the pressure in the pressure accumulator chamber 25 reaches the second predetermined pressure P 2 from the first predetermined pressure P 1 or the pressure accumulation time. While the width corresponding to the amount is W A, which is relatively large, the width W B becomes relatively small in the failure state of the curve B in which a small amount of gas escapes from the gas chamber 26. In the failure state of the curve C in which a large amount of gas is released, the width W C becomes smaller.
【００２３】 ところで、制御装置Ｃは、車輪ブレーキＢの制動圧をアンチロック制御するア ンチロック制御部ＣA と、蓄圧器ＡＣの故障を診断する故障診断部ＣB とを有す るものであり、先ずアンチロック制御部ＣA による制御について説明する。By the way, the control device C has an anti-lock control unit C A for anti-locking the braking pressure of the wheel brake B and a failure diagnosis unit C B for diagnosing a failure of the pressure accumulator AC. First, the control by the antilock controller C A will be described.
【００２４】 制御装置Ｃのアンチロック制御部ＣA により常閉型電磁弁ＶC を閉弁し、かつ 常開型電磁弁ＶO を開弁している状態では、モジュレータ２のアンチロック制御 油圧室１７は油路２１および常開型電磁弁ＶO を介して油タンクＴに開放されて おり、ブレーキペダル１を踏んで一次制動油圧室１５にマスタシリンダＭＣから の油圧を供給すると、二次制動油圧室１６の容積は減少し、車輪ブレーキＢの制 動油室５には、マスタシリンダＭＣからの油圧に応じた制動油圧が供給される。 したがって制動時のトルクは運転者の制動操作に応じて自由に増大する。When the normally closed solenoid valve V C is closed and the normally open solenoid valve V O is opened by the anti-lock control unit C A of the control device C, the anti-lock control hydraulic pressure of the modulator 2 is increased. The chamber 17 is opened to the oil tank T through the oil passage 21 and the normally open solenoid valve V O. When the brake pedal 1 is depressed to supply the hydraulic pressure from the master cylinder MC to the primary braking hydraulic chamber 15, the secondary pressure is generated. The volume of the braking hydraulic chamber 16 decreases, and the braking hydraulic chamber 5 of the wheel brake B is supplied with the braking hydraulic pressure corresponding to the hydraulic pressure from the master cylinder MC. Therefore, the torque during braking freely increases in response to the driver's braking operation.
【００２５】 また常閉型電磁弁ＶC を開弁しかつ常開型電磁弁ＶO を閉弁すると、アンチロ ック制御油圧室１７に蓄圧器ＡＣから油圧が供給されるので、マスタシリンダＭ Ｃからの油圧が一次制動油圧室１５に作用しているにもかかわらず、二次制動油 圧室１６の容積が増大し、車輪ブレーキＢにおける制動油室５の油圧が減少し、 制動トルクが弱められる。したがって車輪がロック状態に入ろうとするときに、 常閉型電磁弁ＶC を開弁しかつ常開型電磁弁ＶO を閉弁することにより車輪がロ ック状態に入ることを回避することができる。When the normally closed solenoid valve V C is opened and the normally open solenoid valve V O is closed, the hydraulic pressure is supplied from the pressure accumulator AC to the anti-lock control hydraulic chamber 17, so that the master cylinder M Although the hydraulic pressure from C acts on the primary braking hydraulic chamber 15, the volume of the secondary braking hydraulic chamber 16 increases, the hydraulic pressure of the braking hydraulic chamber 5 in the wheel brake B decreases, and the braking torque increases. Weakened. Therefore, when the wheel is about to enter the locked state, the normally closed solenoid valve V C is opened and the normally open solenoid valve V O is closed to prevent the wheel from entering the locked state. You can
【００２６】 次に図５を参照しながら、制御装置Ｃにおける故障診断部ＣB の構成について 説明すると、故障診断部ＣB は、３つの入力端子３４，３５，３６と、３つの出 力端子３７，３８，３９とを備える。入力端子３４，３５には、起動信号発生手 段４０，４１がそれぞれ接続される。一方の起動信号発生手段４０は、電源端子 ４２に接続されるトランジスタ４３を、車載エンジンを起動させるためのキース イッチ４４の導通・遮断操作により遮断・導通すべく構成されるものであり、キ ースイッチ４４の導通により入力端子３４にはハイレベルの信号が入力されるこ とになる。また他方の起動信号発生手段４１は、電源端子４２に接続されるトラ ンジスタ４５を、手動操作される故障診断スイッチ４６の導通・遮断操作により 遮断・導通すべく構成されるものであり、故障診断スイッチ４６の導通により入 力端子３５にはハイレベルの信号が入力されることになる。入力端子３６には、 圧力信号発生手段４７が接続される。この圧力信号発生手段４７は、電源端子４ ２に接続されるトランジスタ４８を、圧力検出器Ｓの導通・遮断に応じて導通・ 遮断すべく構成されるものであり、圧力検出器Ｓが導通すると入力端子３６には ローレベルの信号が入力されることになる。さらに出力端子３７は常閉型電磁弁 ＶC に、出力端子３８はモータＭに、出力端子３９は警報ランプ等の警報手段４ ９に接続される。Next, referring to FIG. 5, the configuration of the failure diagnosis unit C B in the control device C will be described. The failure diagnosis unit C B has three input terminals 34, 35, 36 and three output terminals. 37, 38, 39. Starting signal generating means 40 and 41 are connected to the input terminals 34 and 35, respectively. One of the starting signal generating means 40 is configured to cut off / conduct the transistor 43 connected to the power supply terminal 42 by the conduction / interruption operation of the key switch 44 for starting the vehicle-mounted engine. Due to the conduction of 44, a high-level signal is input to the input terminal 34. The other activation signal generating means 41 is configured to disconnect / conduct the transistor 45 connected to the power supply terminal 42 by the conduction / interruption operation of the manually operated failure diagnosis switch 46. Due to the conduction of the switch 46, a high level signal is input to the input terminal 35. The pressure signal generating means 47 is connected to the input terminal 36. The pressure signal generating means 47 is configured to turn on / off the transistor 48 connected to the power supply terminal 42 in response to turning on / off of the pressure detector S. A low level signal is input to the input terminal 36. Further, the output terminal 37 is connected to the normally closed solenoid valve V C , the output terminal 38 is connected to the motor M, and the output terminal 39 is connected to the alarm means 49 such as an alarm lamp.
【００２７】 而して故障診断部ＣB は、圧力検出器Ｓの検出圧力が第１所定圧力Ｐ1 以下と なるのに応じてポンプＰを作動せしめるための駆動信号を出力するとともに前記 検出圧力が第２所定圧力Ｐ2 以上となるのに応じて前記ポンプＰの作動を停止せ しめるための駆動停止信号を出力する駆動制御手段５０と、駆動制御手段５０が 駆動停止信号を出力してから常閉型電磁弁ＶC を第１所定時間Ｔ1 だけ励磁する 第１励磁手段５１と、キースイッチ４４あるいは故障診断スイッチ４６の操作に 応答して前記常閉型電磁弁ＶC を第２所定時間Ｔ2 だけ励磁する第２励磁手段５ ２と、第１励磁手段５１による前記電磁弁ＶC の励磁終了後に圧力検出器Ｓの検 出圧力が第１所定圧力Ｐ1 以下となるのに応じて蓄圧器ＡＣが故障であると判断 する判断手段５３と、前記キースイッチ４４あるいは故障診断スイッチ４６の操 作時に前記圧力検出器Ｓの検出圧力が第１所定圧力Ｐ1 以下となっているときに は第２励磁手段５２を不作動とする第１不作動手段としてのＡＮＤゲート５４と 、前記第２励磁手段５２による前記電磁弁ＶC の励磁後以外には第１励磁手段５ １を不作動とする第２不作動手段としてのＡＮＤゲート５５とを備える。Therefore, the failure diagnosis unit C B outputs a drive signal for operating the pump P in response to the pressure detected by the pressure detector S being less than or equal to the first predetermined pressure P 1 and at the same time the detected pressure is detected. Drive control means 50 for outputting a drive stop signal for stopping the operation of the pump P in response to the second predetermined pressure P 2 or more, and after the drive control means 50 outputs the drive stop signal. In response to the operation of the first excitation means 51 for exciting the normally closed solenoid valve V C for the first predetermined time T 1, and the operation of the key switch 44 or the failure diagnosis switch 46, the normally closed solenoid valve V C is provided for the second predetermined time. In response to the second exciting means 52 for exciting for the time T 2 and the detection pressure of the pressure detector S becoming the first predetermined pressure P 1 or less after the excitation of the solenoid valve V C by the first exciting means 51 is completed. Judgment that the accumulator AC is defective When the means 53 and the key switch 44 or the failure diagnosis switch 46 are operated, and the pressure detected by the pressure detector S is less than or equal to the first predetermined pressure P 1 , the second excitation means 52 is deactivated. An AND gate 54 as a first deactivating means, and an AND gate as a second deactivating means for deactivating the first exciting means 51 except after the electromagnetic valve V C is excited by the second exciting means 52. 55.
【００２８】 駆動制御手段５０は、オフディレイタイマとして構成されるものであり、該駆 動制御手段５０の入力端子には入力端子３６が接続され、駆動制御手段５０の出 力端子は出力端子３８に接続される。而して該駆動制御手段５０は、圧力検出器 Ｓが遮断して圧力信号発生手段４７から入力端子３６にハイレベルの信号が入力 されると同時にハイレベルの駆動信号を出力端子３８からモータＭに与え、圧力 検出器Ｓが導通して入力端子３６に入力される信号がローレベルとなったときか ら一定時間たとえば１０００ｍ秒経過した後に駆動停止信号としてのローレベル の信号をモータＭに与える。The drive control means 50 is configured as an off-delay timer, an input terminal 36 is connected to an input terminal of the drive control means 50, and an output terminal of the drive control means 50 is an output terminal 38. Connected to. Then, the drive control means 50 cuts off the pressure detector S to input a high level signal from the pressure signal generating means 47 to the input terminal 36, and at the same time outputs a high level drive signal from the output terminal 38 to the motor M. And a low level signal as a drive stop signal is given to the motor M after a lapse of a fixed time, for example, 1000 msec, from the time when the signal inputted to the input terminal 36 becomes low level after the pressure detector S is turned on. ..
【００２９】 第１励磁手段５１は、単安定回路であり、ハイレベルの信号が入力されたとき から第１所定時間Ｔ1 だけ持続するハイレベルの信号を出力する。而して第１所 定時間Ｔ1 は、蓄圧器ＡＣが正常である状態（図３の曲線Ａの状態）で蓄圧器Ａ Ｃの圧力が常閉型電磁弁ＶC の開弁に応じて第２所定圧力Ｐ2 以上の所定圧力か ら第１所定圧力Ｐ1 に低下するまでの時間Ｔよりも短い値（たとえば３００ｍ秒 ）に設定されている。The first exciting means 51 is a monostable circuit and outputs a high level signal that lasts for a first predetermined time T 1 from the time when a high level signal is input. Thus, during the first fixed time T 1 , the pressure of the pressure accumulator AC is in accordance with the opening of the normally closed solenoid valve V C in a state where the pressure accumulator AC is normal (state of curve A in FIG. 3). The value is set to a value shorter than the time T from the predetermined pressure equal to or higher than the second predetermined pressure P 2 to the first predetermined pressure P 1 (for example, 300 msec).
【００３０】 また第２励磁手段５２も単安定回路であり、ハイレベルの信号が入力されたと きから第２所定時間Ｔ2 だけ持続するハイレベルの信号を出力する。而して第２ 所定時間Ｔ2 は、蓄圧器ＡＣが正常である状態（図３の曲線Ａの状態）で蓄圧器 ＡＣの圧力が常閉型電磁弁ＶC の開弁に応じて第２所定圧力Ｐ2 以上の所定圧力 から第１所定圧力Ｐ1 に低下するまでの時間Ｔよりも短い値（たとえば３００ｍ 秒）に設定されている。The second excitation means 52 is also a monostable circuit, and outputs a high level signal that lasts for a second predetermined time T 2 after the high level signal is input. Thus, during the second predetermined time T 2 , the pressure of the pressure accumulator AC is the second when the pressure of the pressure accumulator AC is normal (the state of the curve A in FIG. 3) when the normally closed solenoid valve V C is opened. It is set to a value (for example, 300 msec) shorter than the time T from the predetermined pressure P 2 or more to the first predetermined pressure P 1 .
【００３１】 第１および第２励磁手段５１，５２の出力はＯＲゲート５９に入力されており 、該ＯＲゲート５９の出力端子は出力端子３７に接続される。したがって両励磁 手段５１，５２の少なくとも一方がハイレベルの信号を出力するのに応じて常閉 型電磁弁ＶC が励磁されて開弁することになる。The outputs of the first and second exciting means 51 and 52 are input to the OR gate 59, and the output terminal of the OR gate 59 is connected to the output terminal 37. Therefore, the normally closed solenoid valve V C is excited and opens in response to at least one of the two excitation means 51, 52 outputting a high level signal.
【００３２】 第２励磁手段５２にはＡＮＤゲート５４の出力が入力されており、このＡＮＤ ゲート５４には、ＯＲゲート５８の出力信号が入力されるとともに入力端子３６ に入力された信号が反転して入力される。またＯＲゲート５８には両入力端子３ ４，３５が並列に接続されている。したがってＡＮＤゲート５４は、入力端子３ ６に入力される信号がローレベルすなわち圧力検出器Ｓが導通している状態での み、キースイッチ４４および故障診断スイッチ４６の少なくとも一方を導通操作 するのに応じて第２励磁手段５２にハイレベルの信号を入力することになる。The output of the AND gate 54 is input to the second exciting means 52, and the output signal of the OR gate 58 is input to the AND gate 54 and the signal input to the input terminal 36 is inverted. Is entered. Both input terminals 34 and 35 are connected to the OR gate 58 in parallel. Therefore, the AND gate 54 operates to conduct at least one of the key switch 44 and the failure diagnosis switch 46 only when the signal input to the input terminal 36 is at a low level, that is, when the pressure detector S is conducted. Accordingly, the high level signal is input to the second excitation means 52.
【００３３】 第１励磁手段５１にはＡＮＤゲート５５の出力が入力されており、該ＡＮＤゲ ート５５には、駆動制御手段５０の出力信号が反転されて入力されるとともにタ イマ５７の出力信号が入力される。このタイマ５７には、ＯＲゲート６０からの 信号が入力されており、ＯＲゲート６０には、ＯＲゲート５８の出力信号が入力 されるとともに第２励磁手段５２の出力信号がインバータ５６により反転されて 入力されている。このためＯＲゲート５８の出力信号の立ち上がり、すなわちキ ースイッチ４４および故障診断スイッチ４６の少なくとも一方を導通操作したと き、あるいは第２励磁手段５２の出力信号の立ち下がり、すなわちキースイッチ ４４および故障診断スイッチ４６の少なくとも一方を導通操作するのに応じた常 閉型電磁弁ＶC の開弁作動終了時にＯＲゲート６０からハイレベルの信号が出力 され、タイマ５７は、ハイレベルの信号が入力されてから一定時間持続するハイ レベルの信号を出力する。而してタイマ５７で設定される前記一定時間は、蓄圧 器ＡＣが正常である状態でポンプＰの作動により蓄圧器ＡＣの圧力が第１所定圧 力Ｐ1 から第２所定圧力Ｐ2 以上の圧力に達するまでの時間程度に設定されてい る。したがって、ＡＮＤゲート５５は、キースイッチ４４および故障診断スイッ チ４６の少なくとも一方を導通操作してから一定時間内、あるいは第２励磁手段 ５２により常閉型電磁弁ＶC の励磁が終了した後の一定時間内に蓄圧器ＡＣの圧 力が第２所定圧力Ｐ2 以上となってポンプＰの作動が終了したときのみハイレベ ルの信号を第１励磁手段５１に与えることになる。The output of the AND gate 55 is input to the first excitation means 51, the output signal of the drive control means 50 is inverted and input to the AND gate 55, and the output of the timer 57 is input. A signal is input. The signal from the OR gate 60 is input to the timer 57, the output signal of the OR gate 58 is input to the OR gate 60, and the output signal of the second exciting means 52 is inverted by the inverter 56. It has been entered. Therefore, when the output signal of the OR gate 58 rises, that is, when at least one of the key switch 44 and the failure diagnosis switch 46 is turned on, or the output signal of the second exciting means 52 falls, that is, the key switch 44 and the failure diagnosis. A high level signal is output from the OR gate 60 at the end of the opening operation of the normally closed solenoid valve V C in response to at least one of the switches 46 being turned on, and the timer 57 receives the high level signal. Outputs a high-level signal that lasts for a certain time. Therefore, during the fixed time set by the timer 57, the pressure of the pressure accumulator AC is from the first predetermined pressure P 1 to the second predetermined pressure P 2 or more by the operation of the pump P while the pressure accumulator AC is normal. The time is set to reach the pressure. Therefore, the AND gate 55 operates within a certain period of time after conducting at least one of the key switch 44 and the failure diagnosis switch 46, or after the second excitation means 52 completes the excitation of the normally closed solenoid valve V C. Only when the pressure of the accumulator AC becomes equal to or higher than the second predetermined pressure P 2 within a certain time and the operation of the pump P is completed, the high level signal is given to the first excitation means 51.
【００３４】 判断手段５３には入力端子３６からの信号および第１励磁手段５１の出力信号 が入力され、該判断手段５３の出力信号は出力端子３９から警報手段４９に与え られる。而して該判断手段５３は、第１励磁手段５１からの出力信号がハイレベ ルからローレベルに変化したときすなわち第１励磁手段５１による常閉型電磁弁 ＶC の励磁が終了したときに、圧力検出器Ｓの検出圧力が第１所定圧力Ｐ1 以下 すなわち圧力信号発生手段４７の出力信号がハイレベルとなっているときに、蓄 圧器ＡＣが故障であると判断してハイレベルの信号を警報手段４９に与え、警報 手段４９はハイレベルの信号の入力に応じて警報作動する。A signal from the input terminal 36 and an output signal of the first exciting means 51 are inputted to the judging means 53, and the output signal of the judging means 53 is given to the alarm means 49 from the output terminal 39. Then, the judging means 53 determines that when the output signal from the first exciting means 51 changes from high level to low level, that is, when the excitation of the normally closed solenoid valve V C by the first exciting means 51 ends. When the pressure detected by the pressure detector S is less than or equal to the first predetermined pressure P 1, that is, when the output signal of the pressure signal generating means 47 is at high level, it is judged that the pressure accumulator AC is in failure and a high level signal is output. The alarm means 49 is given to the alarm means 49, and the alarm means 49 is activated in response to the input of a high level signal.
【００３５】 次に上述のように構成されている故障診断部ＣB による制御手順について図６ を参照しながら説明すると、第１ステップＳ１において、キースイッチ４４およ び故障診断スイッチ４６の少なくとも一方が導通操作されて起動信号発生手段４ ０，４１の少なくとも一方からハイレベルの信号が出力されたかどうかが判断さ れ、起動信号が発生しているときには第２ステップＳ２において、圧力検出器Ｓ が導通しているかどうかが判断される。起動信号が発生し、かつ圧力検出器Ｓが 導通しているときには、ＡＮＤゲート５４からハイレベルの信号が出力され、そ れに応じて第３ステップＳ３において第２励磁手段５２かち第２所定時間Ｔ2 だ け持続するハイレベルの信号が出力されることにより、常閉型電磁弁ＶC が第２ 所定時間Ｔ2 だけ開弁される。その後の第４ステップＳ４では、圧力検出器Ｓが 導通しているかどうかが判断され、導通状態にあるときには第５ステップＳ５で 蓄圧器ＡＣは正常と判断される。Next, the control procedure by the failure diagnosis unit C B configured as described above will be described with reference to FIG. 6. In the first step S1, at least one of the key switch 44 and the failure diagnosis switch 46 is performed. It is determined whether or not a high level signal has been output from at least one of the activation signal generation means 40, 41 by conducting the switch, and when the activation signal is generated, the pressure detector S 1 is activated in the second step S2. It is determined whether or not there is continuity. When a start signal is generated and the pressure detector S is conducting, a high level signal is output from the AND gate 54, and in response thereto, in the third step S3, the second excitation means 52 and the second predetermined time. by a high level signal which lasts only the T 2 is outputted, the normally closed electromagnetic valves V C is opened by T 2 second predetermined time. In the subsequent fourth step S4, it is determined whether or not the pressure detector S is conducting, and when it is in the conducting state, the pressure accumulator AC is determined to be normal in the fifth step S5.
【００３６】 第２ステップＳ２および第４ステップＳ４で圧力検出器Ｓが遮断状態にあると 判断されたときには、第６ステップＳ６に進み、駆動制御手段５０からの起動信 号によりモータＭが作動を始め、ポンプＰによる蓄圧器ＡＣへの蓄圧が開始され る。而して第７ステップＳ７で圧力検出器Ｓが導通状態になったと判断された後 、第８ステップＳ８において駆動制御手段５０で設定されている一定時間たとえ ば１０００ｍ秒経過するまでモータＭすなわちポンプＰの作動が継続され、駆動 制御手段５０からの駆動停止信号の出力により第９ステップＳ９でモータＭすな わちポンプＰの作動が停止される。When it is determined in the second step S2 and the fourth step S4 that the pressure detector S is in the cutoff state, the process proceeds to a sixth step S6, and the motor M is activated by a start signal from the drive control means 50. First, the pressure accumulation in the pressure accumulator AC by the pump P is started. Then, after it is determined in the seventh step S7 that the pressure detector S is in the conductive state, in the eighth step S8 the motor M, i.e., the pump, continues until the fixed time set by the drive control means 50 e.g. 1000 msec. The operation of P is continued, and the operation of the motor M, that is, the pump P is stopped in the ninth step S9 by the output of the drive stop signal from the drive control means 50.
【００３７】 第１０ステップＳ１０では、第１励磁手段５１から第１所定時間Ｔ1 だけ持続 するハイレベルの信号が出力され、それに応じて常閉型電磁弁ＶC が第１所定時 間Ｔ1 だけ開弁されることになる。次いで第１１ステップＳ１１では圧力検出器 Ｓが導通状態にあるかどうかが判断され、遮断状態にあるときには第１２ステッ プＳ１２で蓄圧器ＡＣが故障であるとして警報手段４９の警報作動が行なわれ、 導通状態にあると判断されたときには第１３ステップＳ１３で蓄圧器ＡＣが正常 であるとされる。In the tenth step S10, a high-level signal that lasts for a first predetermined time T 1 is output from the first excitation means 51, and the normally closed solenoid valve V C accordingly has a first predetermined time T 1. Only the valve will be opened. Next, in the eleventh step S11, it is judged whether or not the pressure detector S is in the conducting state, and when it is in the cutoff state, the alarming means 49 performs the alarming operation in the twelfth step S12 as the failure of the pressure accumulator AC, When it is determined that the pressure is on, the accumulator AC is determined to be normal in the thirteenth step S13.
【００３８】 次にこの実施例の作用について説明すると、制御装置Ｃにおける故障診断部Ｃ B では、圧力検出器Ｓが遮断するのに応じて駆動制御手段５０によりモータＭす なわちポンプＰを作動せしめ、それにより蓄圧器ＡＣの圧力が第２所定圧力Ｐ2 以上となってから第１励磁手段５１により第１所定時間Ｔ1 だけ常閉型電磁弁Ｖ C を開弁して蓄圧器ＡＣの圧力を解放する。しかも第１所定時間Ｔ1 は、正常で ある蓄圧器ＡＣの圧力が常閉型電磁弁ＶC の開弁に応じて第２所定圧力Ｐ2 以上 の所定圧力から第１所定圧力Ｐ1 に低下するまでの時間Ｔよりも短く設定されて いるので、常閉型電磁弁ＶC の第１所定時間Ｔ1 だけの開弁の結果、蓄圧器ＡＣ の圧力が第１所定圧力Ｐ1 以下となったときには故障と判断することができ、蓄 圧器ＡＣの故障判断を確実に行なうことができる。Next, the operation of this embodiment will be described. The fault diagnosis unit C in the control device C is described. B Then, in response to the shutoff of the pressure detector S, the drive control means 50 activates the motor M, that is, the pump P, whereby the pressure of the pressure accumulator AC is changed to the second predetermined pressure P.2 After the above, the first exciting unit 51 causes the first predetermined time T1Normally closed solenoid valve V C Is opened to release the pressure of the accumulator AC. Moreover, the first predetermined time T1Indicates that the normal pressure of the accumulator AC is the normally closed solenoid valve VCThe second predetermined pressure P according to the opening of the valve2From the above predetermined pressure to the first predetermined pressure P1Since it is set to be shorter than the time T until it decreases toCFirst predetermined time T of1As a result, the pressure of the pressure accumulator AC becomes the first predetermined pressure P.1When it becomes the following, it can be judged as a failure, and the failure judgment of the accumulator AC can be surely made.
【００３９】 しかもキースイッチ４４あるいは故障診断スイッチ４６の手動操作に応じた起 動診断発生手段４０，４１からの起動信号発生に応じて第２励磁手段５２により 第２所定時間Ｔ2 だけ常閉型電磁弁ＶC を開弁して蓄圧器ＡＣの圧力を解放して いる。しかも、第２所定時間Ｔ2 は、正常である蓄圧器ＡＣの圧力が常閉型電磁 弁ＶC の開弁に応じて第２所定圧力Ｐ2 以上の所定圧力から第１所定圧力Ｐ1 に 低下するまでの時間Ｔよりも短く設定されているので、常閉型電磁弁ＶC の第２ 所定時間Ｔ2 だけの開弁の結果、蓄圧器ＡＣが正常であれば圧力が第１所定圧力 Ｐ1 以下とならない場合もあるが、故障しているときには蓄圧器ＡＣの圧力を第 １所定圧力Ｐ1 以下に確実に降下させ、それに応じた駆動制御手段５０および第 １励磁手段５１の作用により判断手段５３で蓄圧器ＡＣの故障判断が自動的に行 なわれることになり、キースイッチ４４の操作により車載エンジンの起動時毎に 、また故障診断スイッチ４６の操作により任意に蓄圧器ＡＣの故障診断を行なう ことができる。Moreover, the second excitation means 52 normally closes the second predetermined time T 2 in response to the generation of the start signal from the start diagnosis generating means 40, 41 in response to the manual operation of the key switch 44 or the failure diagnosis switch 46. The solenoid valve V C is opened to release the pressure of the accumulator AC. Moreover, the second predetermined time T 2 are, in accumulator AC at the second predetermined pressure P 2 over the first predetermined pressure P 1 from a predetermined pressure in response the pressure to the valve opening of the normally closed electromagnetic valves V C are normal Since it is set to be shorter than the time T until it decreases, as a result of opening the normally closed solenoid valve V C for the second predetermined time T 2 , if the pressure accumulator AC is normal, the pressure is the first predetermined pressure. in some cases that do not P 1 or less, by the action of the pressure accumulator a pressure of AC reliably lowered to the first predetermined pressure P 1 or less, the drive control means 50 and the first excitation means 51 in response thereto when the faulty The judgment means 53 automatically judges the failure of the pressure accumulator AC, and operates the key switch 44 every time the vehicle-mounted engine is started, or operates the failure diagnosis switch 46 to arbitrarily detect the failure of the pressure accumulator AC. A diagnosis can be made.
【００４０】 またＡＮＤゲート５４の働きにより、第２励磁手段５２は圧力検出器Ｓが導通 状態にあるときには起動信号発生手段４０，４１から起動信号が発生していても ハイレベルの信号を出力することはなく、したがって常閉型電磁弁ＶC の不要な 開弁を回避することができ、ポンプＰ作動時に常閉型電磁弁ＶC の開弁による作 動油の無駄な消費を防止することができる。Further, by the operation of the AND gate 54, the second excitation means 52 outputs a high level signal when the activation signal is generated from the activation signal generation means 40, 41 when the pressure detector S is in the conductive state. Therefore, unnecessary opening of the normally closed solenoid valve V C can be avoided, and wasteful consumption of operating oil due to opening of the normally closed solenoid valve V C during operation of the pump P can be prevented. You can
【００４１】 さらにＡＮＤゲート５５の働きにより、第１励磁手段５１は、起動信号発生手 段４０，４１からの起動信号発生に伴う常閉型電磁弁ＶC の励磁開弁が終了した 後以外には、不作動となるものであり、常閉型電磁弁ＶC の不要な開弁を回避す ることができる。すなわち蓄圧器ＡＣの故障診断を行なうとき以外に常閉型電磁 弁ＶC を開弁して蓄圧器ＡＣの圧力を解放するのは無駄な圧力消費であるととも に、アンチロック制御時以外に常閉型電磁弁ＶC を開弁してしまうことは避けな ければならない。Further, by the action of the AND gate 55, the first excitation means 51 is provided only after the excitation and opening of the normally closed solenoid valve V C due to the activation signal generation from the activation signal generation means 40, 41 is completed. Is inoperative, and unnecessary opening of the normally closed solenoid valve V C can be avoided. That is, it is useless pressure consumption to release the pressure of the accumulator AC by opening the normally-closed solenoid valve V C except when the failure diagnosis of the accumulator AC is performed. It is necessary to avoid opening the normally closed solenoid valve V C.
【００４２】 しかも蓄圧器ＡＣにおいてシリンダ体２３とピストン２４との間のフリクショ ンロスは比較的大きいものであり、このようなタイプの蓄圧器ＡＣにあっては、 蓄圧室２６の微小な圧力変化に対する追従性が低いものであり、上述のように蓄 圧器ＡＣの圧力を第１所定圧力Ｐ1 以下に一旦降下させてから第２所定圧力Ｐ2 以上に蓄圧させた後、再び圧力を解放して故障を判断する手法は、特に有効とな る。Moreover, in the pressure accumulator AC, the friction loss between the cylinder body 23 and the piston 24 is relatively large. In the pressure accumulator AC of this type, even if a slight pressure change in the pressure accumulator chamber 26 occurs, Since the followability is low, the pressure of the accumulator AC is once lowered to the first predetermined pressure P 1 or less as described above, and then is accumulated to the second predetermined pressure P 2 or more, and then the pressure is released again. The method of judging a failure is particularly effective.
【００４３】 図７は本考案の他の実施例の図５に対応する回路図であり、上記実施例に対応 する部分には同一の参照符号を付す。FIG. 7 is a circuit diagram corresponding to FIG. 5 of another embodiment of the present invention, and the portions corresponding to those in the above embodiment are designated by the same reference numerals.
【００４４】 制御装置Ｃにおける故障診断部ＣB は、上記実施例における第２励磁手段５２ に代えて第３励磁手段６１を備えるとともに、ＡＮＤゲート５４に代えて第３不 作動手段としてのＡＮＤゲート６２を備えるものである。The failure diagnosing section C B in the control device C comprises a third exciting means 61 in place of the second exciting means 52 in the above embodiment, and an AND gate as a third inactivating means in place of the AND gate 54. 62 is provided.
【００４５】 而して第３励磁手段６１は、手動操作に応じて起動信号を発生する起動信号発 生手段４０，４１の操作に応答して前記圧力検出器Ｓが導通するまで常閉型電磁 弁ＶC を励磁するフリップフロップであり、ＡＮＤゲート６２は、前記起動信号 発生手段４０，４１からの起動信号発生時に前記圧力検出器Ｓが遮断していると きには第３励磁手段６１を不作動とするものであり、ＡＮＤゲート６２にはＯＲ ゲート５８の出力信号が入力されるとともに入力端子３６からの信号が反転して 入力され、第３励磁手段６１にはＡＮＤゲート６２および入力端子３６が接続さ れる。Thus, the third excitation means 61 is a normally closed electromagnetic wave until the pressure detector S becomes conductive in response to the operation of the activation signal generation means 40, 41 for generating the activation signal in response to the manual operation. The AND gate 62 is a flip-flop that excites the valve V C , and the AND gate 62 operates the third excitation means 61 when the pressure detector S is shut off when the activation signals are generated from the activation signal generation means 40 and 41. The output signal of the OR gate 58 is input to the AND gate 62 and the signal from the input terminal 36 is inverted and input to the AND gate 62, and the AND gate 62 and the input terminal are input to the third excitation means 61. 36 is connected.
【００４６】 この実施例によると、上記実施例と同様の効果を奏することができるとともに 、起動信号発生時に圧力検出器Ｓが導通状態にあるときには、蓄圧器ＡＣの圧力 が第１所定圧力Ｐ1 以下となるまで常閉型電磁弁ＶC を開弁して、蓄圧器ＡＣの 故障診断を任意にあるいは自動的に行なうことができる。According to this embodiment, the same effect as that of the above embodiment can be obtained, and when the pressure detector S is in the conducting state when the start signal is generated, the pressure of the pressure accumulator AC is the first predetermined pressure P 1 The normally-closed solenoid valve V C is opened until the following conditions are satisfied, and failure diagnosis of the accumulator AC can be performed arbitrarily or automatically.
【００４７】[0047]
以上のように本考案の第１の特徴によれば、制御装置は、駆動制御手段が駆動 停止信号を出力した後に前記電磁弁を第１所定時間だけ励磁する第１励磁手段と 、前記電磁弁の励磁終了後に圧力検出器の検出圧力が第１所定圧力以下となるの に応じて蓄圧器が故障であると判断する判断手段とを備え、第１所定時間は、正 常である蓄圧器の圧力が常閉型電磁弁の開弁に応じて第２所定圧力以上の所定圧 力から第１所定圧力に低下するまでの時間よりも短く設定されるので、蓄圧器の 圧力を第２所定圧力以上とした後に解放することにより、蓄圧器の故障判断を確 実に行なうことができる。 As described above, according to the first feature of the present invention, the control device includes the first excitation means for exciting the solenoid valve for the first predetermined time after the drive control means outputs the drive stop signal, and the solenoid valve. After the end of the excitation, the pressure detector determines that the pressure accumulator is in failure when the pressure detected by the pressure detector becomes equal to or lower than the first predetermined pressure, and the accumulator which is normal for the first predetermined time is Since the pressure is set shorter than the time required for the pressure to drop from the second predetermined pressure or higher to the first predetermined pressure in response to the opening of the normally closed solenoid valve, the pressure of the pressure accumulator is set to the second predetermined pressure. By releasing after the above, the failure judgment of the pressure accumulator can be made accurately.
【００４８】 また本考案の第２の特徴によれば、上記第１の特徴の構成に加えて、前記制御 装置は、手動操作に応じて起動信号を発生する起動信号発生手段の操作に応答し て前記常閉型電磁弁を第２所定時間だけ励磁する第２励磁手段を備え、第２所定 時間は、正常である蓄圧器の圧力が常閉型電磁弁の開弁に応じて第２の所定圧力 以上の所定圧力から第１の所定圧力に低下するまでの時間よりも短く設定される ので、起動信号発生手段からの起動信号に応じて蓄圧器の故障判断を自動的にあ るいは任意に行なうことができる。According to a second feature of the present invention, in addition to the configuration of the first feature, the control device responds to an operation of an activation signal generating means that generates an activation signal in response to a manual operation. And a second exciting means for exciting the normally closed solenoid valve for a second predetermined time. During the second predetermined time, the pressure of the accumulator that is normal is set to a second value according to the opening of the normally closed solenoid valve. Since it is set to be shorter than the time required for the pressure to drop from the predetermined pressure equal to or higher than the predetermined pressure to the first predetermined pressure, failure determination of the pressure accumulator may be made automatically or arbitrarily according to the start signal from the start signal generating means. Can be done to.
【００４９】 本考案の第３の特徴によれば、上記第２の特徴の構成に加えて、前記制御装置 は、前記起動信号発生手段からの起動信号発生時に前記圧力検出器の検出圧力が 第１所定圧力以下となっているときには第２励磁手段を不作動とする第１不作動 手段を備えるので、電磁弁の不要な開弁を回避して作動油の無駄な消費を防止す ることができる。According to a third aspect of the present invention, in addition to the configuration of the second aspect, the control device controls the pressure detected by the pressure detector when the activation signal is generated from the activation signal generating means. Since the first deactivating means for deactivating the second exciting means when the pressure is equal to or lower than 1 predetermined pressure is provided, it is possible to avoid unnecessary opening of the solenoid valve and prevent wasteful consumption of hydraulic oil. it can.
【００５０】 本考案の第４の特徴によれば、上記第１の特徴の構成に加えて、前記制御装置 は、手動操作に応じて起動信号を発生する起動信号発生手段の操作に応答して前 記圧力検出器の検出圧力が第１所定圧力以下となるまで前記電磁弁を励磁する第 ３励磁手段を備えるので、起動信号発生手段からの起動信号に応じて蓄圧器の圧 力を第１所定圧力以下まで降下させ、それにより蓄圧器の故障判断を自動的にあ るいは任意に行なうことができる。According to a fourth aspect of the present invention, in addition to the configuration of the first aspect, the control device is responsive to an operation of an activation signal generating means for generating an activation signal in response to a manual operation. Since the third exciting means for exciting the solenoid valve is provided until the pressure detected by the pressure detector becomes equal to or lower than the first predetermined pressure, the pressure of the pressure accumulator is changed to the first pressure in accordance with the activation signal from the activation signal generating means. By lowering the pressure to a predetermined pressure or less, the failure of the pressure accumulator can be judged automatically or arbitrarily.
【００５１】 本考案の第５の特徴によれば、上記第２または第４の特徴の構成に加えて、前 記制御装置は、前記起動信号発生手段からの起動信号発生から所定時間が経過す まるで以外には第１励磁手段を不作動とする第２不作動手段を備えるので、故障 診断時以外の常閉型電磁弁の不要な開弁を回避し、無駄な圧力消費を防止するこ とができる。According to a fifth feature of the present invention, in addition to the configuration of the second or fourth feature, the control device is configured such that a predetermined time elapses after the activation signal is generated from the activation signal generating means. Since the second deactivating means that deactivates the first exciting means is provided except for, it is possible to avoid unnecessary opening of the normally closed solenoid valve except at the time of failure diagnosis, and prevent useless pressure consumption. You can
【００５２】 本考案の第６の特徴によれば、上記第４の特徴の構成に加えて、前記制御装置 は、前記起動信号発生手段からの起動信号発生時に前記圧力検出器の検出圧力が 第１所定圧力以下となっているときには第３励磁手段を不作動とする第３不作動 手段を備えるので、電磁弁の不要な開弁を回避して作動油の無駄な消費を防止す ることができる。According to a sixth aspect of the present invention, in addition to the configuration of the fourth aspect, the control device controls the pressure detected by the pressure detector when the activation signal is generated from the activation signal generating means. Since the third deactivating means for deactivating the third exciting means when the pressure is equal to or lower than 1 predetermined pressure is provided, it is possible to avoid unnecessary opening of the solenoid valve and prevent wasteful consumption of hydraulic oil. it can.
【００５３】 本考案の第７の特徴によれば、上記第１，第２，第３，第４，第５または第６ の特徴の構成に加えて、蓄圧器は、シリンダ体と、該シリンダ体に摺動自在に嵌 合されるピストンの両面との間に、ポンプおよび圧力機器に接続される蓄圧室と ガスが封入されるガス室とが画成されて成るので、圧力変化に対する追従性が低 いにもかかわらず、有効な故障判断を行なうことができる。According to a seventh feature of the present invention, in addition to the configuration of the first, second, third, fourth, fifth or sixth feature, the pressure accumulator includes a cylinder body and the cylinder body. Since the accumulator that is connected to the pump and the pressure equipment and the gas chamber that contains the gas are defined between both sides of the piston that is slidably fitted to the body, it is possible to follow the pressure change. Despite its low value, effective fault judgment can be made.
【提出日】平成３年２月５日[Submission date] February 5, 1991
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２２[Name of item to be corrected] 0022
【補正方法】変更[Correction method] Change
【００２２】 而して、蓄圧器２５が正常に作動している曲線Ａの状態では蓄圧 室２５の圧力が第１の所定圧力Ｐ1 から第２の所定圧力Ｐ2 に達するまでの時間 あるいは蓄液量に対応する幅が比較的大きなＷA であるのに対し、ガス室２６か ら少量のガス抜けが生じている曲線Ｂの故障状態では前記幅ＷB が比較的小さく なり、さらにガス室２６から多量のガス抜けが生じている曲線Ｃの故障状態では 前記幅ＷC がさらに小さくなる。Therefore, in the state of the curve A in which the pressure accumulator 25 is operating normally, the time until the pressure in the pressure accumulator chamber 25 reaches the second predetermined pressure P 2 from the first predetermined pressure P 1 While the width corresponding to the liquid amount is W A, which is relatively large, the width W B becomes relatively small in the failure state of the curve B in which a small amount of gas escapes from the gas chamber 26. In the failure state of the curve C in which a large amount of gas is released from 26, the width W C becomes smaller.
【図１】本考案の一実施例の自動車用ブレーキ装置の油
圧系統図である。FIG. 1 is a hydraulic system diagram of a vehicle brake device according to an embodiment of the present invention.
【図２】蓄圧器の縦断面図である。FIG. 2 is a vertical sectional view of a pressure accumulator.
【図３】蓄圧器の蓄圧作動特性図である。FIG. 3 is a pressure accumulation operation characteristic diagram of a pressure accumulator.
【図４】圧力検出器の検出範囲を示す図である。FIG. 4 is a diagram showing a detection range of a pressure detector.
【図５】制御装置の要部構成を示す回路図である。FIG. 5 is a circuit diagram showing a main configuration of a control device.
【図６】制御装置の制御手順を示すフローチャートであ
る。FIG. 6 is a flowchart showing a control procedure of the control device.
【図７】本考案の他の実施例の図５に対応する回路図で
ある。FIG. 7 is a circuit diagram corresponding to FIG. 5 of another embodiment of the present invention.
２ 圧力機器としてのモジュレータ ２３ シリンダ体 ２４ ピストン ２５ 蓄圧室 ２６ ガス室 ４０，４１ 起動信号発生手段 ５０ 駆動制御手段 ５１ 第１励磁手段 ５２ 第２励磁手段 ５３ 判断手段 ５４ 第１不作動手段としてのＡＮＤゲート ５５ 第２不作動手段としてのＡＮＤゲート ６１ 第３励磁手段 ６２ 第３不作動手段としてのＡＮＤゲート ＡＣ 蓄圧器 Ｃ 制御装置 Ｐ ポンプ Ｓ 圧力検出器 Ｔ 液体タンクとしての油タンク ＶC 常閉型電磁弁2 Modulator as pressure equipment 23 Cylinder body 24 Piston 25 Accumulation chamber 26 Gas chamber 40, 41 Start signal generation means 50 Drive control means 51 First excitation means 52 Second excitation means 53 Judgment means 54 AND as first inactivation means gate 55 the 2 AND gate 61 third exciting means 62 third oil tank V C normally closed as an AND gate AC accumulator C controller P pump S pressure detector T liquid tank as deactivating means as deactivating means solenoid valve
【手続補正書】[Procedure amendment]
【提出日】平成３年２月５日[Submission date] February 5, 1991
【手続補正２】[Procedure Amendment 2]
【補正対象書類名】図面[Document name to be corrected] Drawing
【補正対象項目名】図３[Name of item to be corrected] Figure 3
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【図３】 [Figure 3]
Claims (7)
ンプ（Ｐ）と、該ポンプ（Ｐ）および圧力機器（２）に
接続される蓄圧器（ＡＣ）と、前記蓄圧器（ＡＣ）の圧
力を検出する圧力検出器（Ｓ）と、前記圧力機器（２）
と蓄圧器（ＡＣ）または液体タンク（Ｔ）との間に介設
される常閉型電磁弁（ＶC ）と、前記圧力検出器（Ｓ）
の検出圧力が第１所定圧力以下となるのに応じて前記ポ
ンプ（Ｐ）を作動せしめるための駆動信号を出力すると
ともに前記検出圧力が第１所定圧力よりも高い第２所定
圧力以上となるのに応じて前記ポンプ（Ｐ）の作動を停
止せしめるための駆動停止信号を出力する駆動制御手段
（５０）を含む制御装置（Ｃ）とを備える圧力機器用圧
力源において、制御装置（Ｃ）は、駆動制御手段（５
０）が駆動停止信号を出力した後に前記電磁弁（ＶC ）
を第１所定時間だけ励磁する第１励磁手段（５１）と、
前記電磁弁（ＶC ）の励磁終了後に圧力検出器（Ｓ）の
検出圧力が第１所定圧力以下となるのに応じて蓄圧器
（ＡＣ）が故障であると判断する判断手段（５３）とを
備え、第１所定時間は、正常である蓄圧器（ＡＣ）の圧
力が常閉型電磁弁（ＶC ）の開弁に応じて第２所定圧力
以上の所定圧力から第１所定圧力に低下するまでの時間
よりも短く設定されることを特徴とする圧力機器用圧力
源における蓄圧器の故障診断装置。1. A pump (P) for pumping liquid from a liquid tank (T), a pressure accumulator (AC) connected to the pump (P) and a pressure device (2), and a pressure accumulator (AC). Pressure detector (S) for detecting pressure, and the pressure device (2)
Normally closed solenoid valve (V C ) interposed between the pressure accumulator (AC) or the liquid tank (T) and the pressure detector (S)
The drive signal for operating the pump (P) is output in response to the detected pressure of 1 is lower than the first predetermined pressure, and the detected pressure is higher than the second predetermined pressure higher than the first predetermined pressure. In the pressure source for the pressure equipment, the control device (C) comprises: a control device (C) including a drive control means (50) for outputting a drive stop signal for stopping the operation of the pump (P) according to , Drive control means (5
0) outputs a drive stop signal and then the solenoid valve (V C )
A first excitation means (51) for exciting the first predetermined time,
A judging means (53) for judging that the pressure accumulator (AC) has a failure when the pressure detected by the pressure detector (S) becomes equal to or lower than a first predetermined pressure after the excitation of the solenoid valve (V C ) is terminated. For a first predetermined time, the normal pressure of the accumulator (AC) decreases from a predetermined pressure equal to or higher than a second predetermined pressure to a first predetermined pressure in response to opening of the normally closed solenoid valve (V C ). A failure diagnosis device for a pressure accumulator in a pressure source for a pressure device, wherein the failure diagnosis device is set to be shorter than the time required to perform.
て起動信号を発生する起動信号発生手段（４０，４１）
の操作に応答して前記常閉型電磁弁（ＶC ）を第２所定
時間だけ励磁する第２励磁手段（５２）を備え、第２所
定時間は、正常である蓄圧器（ＡＣ）の圧力が常閉型電
磁弁（ＶC ）の開弁に応じて第２の所定圧力以上の所定
圧力から第１の所定圧力に低下するまでの時間よりも短
く設定されることを特徴とする請求項１記載の圧力機器
用圧力源における蓄圧器の故障診断装置。2. The control device (C) generates a start signal in response to a manual operation, and a start signal generating means (40, 41).
In response to the operation of the normally closed solenoid valve (V C ) for a second predetermined time, the second exciting means (52) is provided, and the second predetermined time is the normal pressure of the accumulator (AC). Is set to be shorter than the time required to decrease from the predetermined pressure equal to or higher than the second predetermined pressure to the first predetermined pressure in response to the opening of the normally closed solenoid valve (V C ). 1. A failure diagnostic device for a pressure accumulator in the pressure source for pressure equipment according to 1.
生手段（４０，４１）からの起動信号発生時に前記圧力
検出器（Ｓ）の検出圧力が第１所定圧力以下となってい
るときには第２励磁手段（５２）を不作動とする第１不
作動手段（５４）を備えることを特徴とする請求項２記
載の圧力機器用圧力源における蓄圧器の故障診断装置。3. The control device (C) is configured so that, when the activation signal is generated from the activation signal generating means (40, 41), the pressure detected by the pressure detector (S) is equal to or lower than a first predetermined pressure. The failure diagnosing device for a pressure accumulator in a pressure source for pressure equipment according to claim 2, further comprising a first deactivating means (54) for deactivating the second exciting means (52).
て起動信号を発生する起動信号発生手段（４０，４１）
の操作に応答して前記圧力検出器（Ｓ）の検出圧力が第
１所定圧力以下となるまで前記電磁弁（ＶC ）を励磁す
る第３励磁手段（６０）を備えることを特徴とする請求
項１記載の圧力機器用圧力源における蓄圧器の故障診断
装置。4. The control signal generating means (40, 41) for generating a start signal in response to a manual operation.
A third exciting means (60) for exciting the electromagnetic valve (V C ) until the detected pressure of the pressure detector (S) becomes equal to or lower than a first predetermined pressure in response to the operation of (1). Item 1. A failure diagnosis device for a pressure accumulator in a pressure source for pressure equipment according to item 1.
生手段（４０，４１）からの起動信号発生から所定時間
を経過するまで以外には第１励磁手段（５１）を不作動
とする第２不作動手段（５５）を備えることを特徴とす
る請求項２または４記載の圧力機器用圧力源における蓄
圧器の故障診断装置。5. The control device (C) deactivates the first excitation means (51) except when a predetermined time has elapsed from the generation of the activation signal from the activation signal generation means (40, 41). The failure diagnosing device for a pressure accumulator in a pressure source for a pressure device according to claim 2 or 4, further comprising a second deactivating means (55).
生手段（４０，４１）からの起動信号発生時に前記圧力
検出器（Ｓ）の検出圧力が第１所定圧力以下となってい
るときには第３励磁手段（６０）を不作動とする第３不
作動手段（６１）を備えることを特徴とする請求項４記
載の圧力機器用圧力源における蓄圧器の故障診断装置。6. The control device (C) is configured so that, when the activation signal is generated from the activation signal generation means (40, 41), the pressure detected by the pressure detector (S) is equal to or lower than a first predetermined pressure. The failure diagnosis device for a pressure accumulator in a pressure source for a pressure device according to claim 4, further comprising a third deactivating means (61) for deactivating the third exciting means (60).
３）と、該シリンダ体（２３）に摺動自在に嵌合される
ピストン（２４）の両面との間に、前記ポンプ（Ｐ）お
よび圧力機器（２）に接続される蓄圧室（２５）とガス
が封入されるガス室（２６）とが画成されて成ることを
特徴とする請求項１，２，３，４，５または６記載の圧
力機器用圧力源における蓄圧器の故障診断装置。7. The pressure accumulator (AC) is a cylinder body (2).
A pressure accumulating chamber (25) connected to the pump (P) and the pressure device (2) between the piston (24) slidably fitted to the cylinder body (23). And a gas chamber (26) in which the gas is enclosed is defined, and a failure diagnosis device for a pressure accumulator in a pressure source for a pressure device according to claim 1, 2, 3, 4, 5 or 6. ..
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991000848U JP2534637Y2 (en) | 1991-01-16 | 1991-01-16 | Fault diagnosis device for accumulator in pressure source for pressure equipment |
| US07/820,419 US5373454A (en) | 1991-01-16 | 1992-01-14 | Problem diagnosis system in pressure device control apparatus |
| DE69205292T DE69205292T2 (en) | 1991-01-16 | 1992-01-15 | Problem diagnosis system in a printing device control device. |
| EP92100610A EP0495483B1 (en) | 1991-01-16 | 1992-01-15 | Problem diagnosis system in pressure device control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1991000848U JP2534637Y2 (en) | 1991-01-16 | 1991-01-16 | Fault diagnosis device for accumulator in pressure source for pressure equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0558912U true JPH0558912U (en) | 1993-08-03 |
| JP2534637Y2 JP2534637Y2 (en) | 1997-05-07 |
Family
ID=11485064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1991000848U Expired - Fee Related JP2534637Y2 (en) | 1991-01-16 | 1991-01-16 | Fault diagnosis device for accumulator in pressure source for pressure equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2534637Y2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54152764A (en) * | 1978-05-24 | 1979-12-01 | Honda Motor Co Ltd | Trouble diagnosis device of control circuit for electromagnetic actuator |
| JPS55129886A (en) * | 1979-03-15 | 1980-10-08 | Gaea Trade & Dev Co Ltd | Coin detector |
| JPS58133945A (en) * | 1983-01-19 | 1983-08-09 | Honda Motor Co Ltd | Control device for anti-lock brake device |
| JPS61224225A (en) * | 1985-03-28 | 1986-10-04 | 三菱電機株式会社 | Hydraulic operator for breaker |
-
1991
- 1991-01-16 JP JP1991000848U patent/JP2534637Y2/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54152764A (en) * | 1978-05-24 | 1979-12-01 | Honda Motor Co Ltd | Trouble diagnosis device of control circuit for electromagnetic actuator |
| JPS55129886A (en) * | 1979-03-15 | 1980-10-08 | Gaea Trade & Dev Co Ltd | Coin detector |
| JPS58133945A (en) * | 1983-01-19 | 1983-08-09 | Honda Motor Co Ltd | Control device for anti-lock brake device |
| JPS61224225A (en) * | 1985-03-28 | 1986-10-04 | 三菱電機株式会社 | Hydraulic operator for breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2534637Y2 (en) | 1997-05-07 |
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