JPH07295657A - Pressure controller - Google Patents
Pressure controllerInfo
- Publication number
- JPH07295657A JPH07295657A JP11207994A JP11207994A JPH07295657A JP H07295657 A JPH07295657 A JP H07295657A JP 11207994 A JP11207994 A JP 11207994A JP 11207994 A JP11207994 A JP 11207994A JP H07295657 A JPH07295657 A JP H07295657A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- differential value
- detected
- output end
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims description 27
- 238000010586 diagram Methods 0.000 description 4
- 230000004069 differentiation Effects 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Control Of Fluid Pressure (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、エアリークテスタ等に
適用される圧力制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control device applied to an air leak tester or the like.
【０００２】[0002]
【従来の技術】図５には、従来のエアリークテスタの一
例が示されている。エア通路１０（流体通路）の一端に
は圧縮エア源１１（圧力源）が接続され、エア通路１０
の他端が出力端１２となっている。エア通路１０には、
レギュレータ１８と電磁切換弁１９と流量計１４が上流
側から順に配置されている。レギュレータ１８はスプリ
ングのセット力に対応する所定レベルの供給圧力になる
ように圧縮エア源１１からの圧力をの一部を大気へ逃が
して減圧する。上記リークテスタでは、出力端１２にワ
ークを接続した後で、電磁切換弁１９をオンにしてレギ
ュレータ１８からの供給圧力をワークに供給する。ワー
クに漏れがない場合には、ワークの内圧が低下せず、レ
ギュレータ１８も開かないので、エア通路１０にエアが
流れない。ワークに漏れがある場合には、ワークの内圧
が低下し、これに応じてレギュレータ１８が開いて圧縮
エア源１１と出力端１２を連通させるので、エア通路１
０にエアが流れる。このエアの流れを流量計１４で検出
することにより、ワークの漏れを判定する。2. Description of the Related Art FIG. 5 shows an example of a conventional air leak tester. A compressed air source 11 (pressure source) is connected to one end of the air passage 10 (fluid passage).
The other end of is an output end 12. In the air passage 10,
The regulator 18, the electromagnetic switching valve 19, and the flowmeter 14 are arranged in this order from the upstream side. The regulator 18 releases a part of the pressure from the compressed air source 11 to the atmosphere and reduces the pressure so that the supply pressure has a predetermined level corresponding to the force of setting the spring. In the leak tester, after connecting the work to the output end 12, the electromagnetic switching valve 19 is turned on to supply the supply pressure from the regulator 18 to the work. If the work does not leak, the internal pressure of the work does not drop and the regulator 18 does not open, so that no air flows in the air passage 10. When there is a leak in the work, the internal pressure of the work decreases, and in response to this, the regulator 18 opens and causes the compressed air source 11 and the output end 12 to communicate with each other.
Air flows to 0. By detecting this flow of air with the flow meter 14, the leak of the work is determined.
【０００３】[0003]
【発明が解決しようとする課題】上記構成では、供給圧
力のレベルはレギュレータ１８のスプリングのセット力
に対応していて一定であるため、供給圧力を変更するこ
とができなかった。In the above structure, the supply pressure level cannot be changed because the level of the supply pressure corresponds to the set force of the spring of the regulator 18 and is constant.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記課題を解
決するためになされたものであり、請求項１の圧力制御
装置は、（イ）圧力源と、（ロ）上記圧力源に一端が接
続され他端が出力端として提供される流体通路と、
（ハ）流体通路に設けられた制御弁と、（ニ）上記出力
端またはその近傍の圧力を検出する圧力検出手段と、
（ホ）上記制御弁の下流側の圧力の微分値を検出する圧
力微分値検出手段と、（ヘ）圧力を設定する圧力設定手
段と、（ト）上記検出圧力と上記圧力微分値の和と、上
記設定圧力との差に基づいて、上記制御弁を制御するこ
とにより出力端圧力を設定圧力に一致させる弁制御手段
と、を備えたことを特徴とする。請求項２では、上記圧
力微分値検出手段が、上記圧力検出手段の検出圧力を微
分することにより第１微分値を得る第１微分手段と、上
記制御弁の下流かつ近傍の圧力を検出する補助圧力検出
手段と、この補助圧力検出手段からの検出圧力を微分す
ることにより第２微分値を得る第２微分手段とを備え、
これら第１微分値と第２微分値の和が上記圧力微分値と
して提供されることを特徴とする。請求項３では、上記
制御弁が主制御弁として提供され、上記弁制御手段が、
この主制御弁にパイロット圧を供給して主制御弁を制御
するパイロット制御弁と、このパイロット制御弁を上記
差に基づいて制御するパイロット圧制御手段とを備えて
いることを特徴とする。請求項４では、上記圧力微分値
検出手段が、上記圧力検出手段の検出圧力を微分するこ
とにより第１微分値を得る第１微分手段と、上記パイロ
ット制御弁の下流かつ近傍の圧力を検出する補助圧力検
出手段と、この補助圧力検出手段からの検出圧力を微分
することにより第２微分値を得る第２微分手段とを備
え、これら第１微分値と第２微分値の和が上記圧力微分
値として提供されることを特徴とする。請求項５では、
（イ）圧力源と、（ロ）上記圧力源に一端が接続され他
端が出力端として提供される流体通路と、（ハ）上記流
体通路に設けられた主制御弁と、（ニ）上記主制御弁に
パイロット圧を供給してこの主制御弁を制御するパイロ
ット制御弁と、（ホ）上記出力端またはその近傍の圧力
を検出する圧力検出手段と、（ヘ）上記パイロット制御
弁の下流側の圧力を検出する補助圧力検出手段と、
（ト）上記補助圧力検出手段からの圧力を微分して圧力
微分値を検出する微分手段と、（チ）圧力を設定する圧
力設定手段と、（リ）上記検出圧力と上記圧力微分値の
和と、上記設定圧力との差に基づいて、上記パイロット
制御弁を制御し、ひいては主制御弁を制御することによ
り出力端圧力を設定圧力に一致させるパイロット圧制御
手段と、を備えたことを特徴とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a pressure control device according to claim 1 is: (a) a pressure source; and (b) one end of the pressure source. And a fluid passage having the other end provided as an output end,
(C) a control valve provided in the fluid passage, and (d) a pressure detecting means for detecting the pressure at or near the output end,
(E) Pressure differential value detecting means for detecting the differential value of the pressure on the downstream side of the control valve, (f) pressure setting means for setting the pressure, and (g) the sum of the detected pressure and the pressure differential value. And a valve control means for matching the output end pressure with the set pressure by controlling the control valve based on the difference from the set pressure. In claim 2, the pressure differential value detection means is a first differential means for obtaining a first differential value by differentiating the pressure detected by the pressure detection means, and an auxiliary for detecting pressure in the vicinity of and downstream of the control valve. Pressure detection means and second differential means for obtaining a second differential value by differentiating the detected pressure from the auxiliary pressure detection means,
It is characterized in that the sum of the first differential value and the second differential value is provided as the pressure differential value. In claim 3, the control valve is provided as a main control valve, and the valve control means comprises:
A pilot control valve for supplying pilot pressure to the main control valve to control the main control valve, and a pilot pressure control means for controlling the pilot control valve based on the difference are characterized. In the present invention, the pressure differential value detecting means detects the first differential means for obtaining a first differential value by differentiating the pressure detected by the pressure detecting means, and the pressure downstream of and in the vicinity of the pilot control valve. The auxiliary pressure detecting means and the second differentiating means for obtaining the second differential value by differentiating the detected pressure from the auxiliary pressure detecting means are provided, and the sum of the first differential value and the second differential value is the pressure differential. It is provided as a value. In claim 5,
(A) a pressure source; (b) a fluid passage having one end connected to the pressure source and the other end provided as an output end; (c) a main control valve provided in the fluid passage; A pilot control valve for supplying pilot pressure to the main control valve to control the main control valve, (e) pressure detection means for detecting pressure at or near the output end, and (f) downstream of the pilot control valve. Auxiliary pressure detecting means for detecting the side pressure,
(G) Differentiating means for differentiating the pressure from the auxiliary pressure detecting means to detect the pressure differential value, (h) pressure setting means for setting the pressure, and (ii) sum of the detected pressure and the pressure differential value. And pilot pressure control means for controlling the pilot control valve based on the difference between the set pressure and the main control valve so that the output end pressure matches the set pressure. And
【０００５】[0005]
【作用】請求項１の発明において、弁制御手段は、基本
的に、圧力検出手段からの検出圧力と圧力設定手段から
の設定圧力との差に基づいて検出圧力が設定圧力に一致
するように、制御弁を制御する。設定圧力は、圧力設定
手段で所望レベルに設定できる。圧力検出手段は、出力
端またはその近傍の圧力を検出するので、正確に出力端
圧力を設定圧力にすることができる。制御弁と出力端と
の間の流通抵抗により、制御弁の開度変化から遅れて出
力端圧力が変化するため、上記検出圧力を設定圧力との
差に基づいて制御弁を制御するだけでは、出力端圧力に
オーバーシュート，アンダーシュートが過度に現れてし
まう。しかし、請求項１では、制御弁の下流側の圧力微
分値を圧力微分値検出手段で検出し、この圧力微分値と
上記検出圧力の和と、上記設定圧力との差に基づいて制
御弁を制御する。そのため、上記検出圧力の和と設定圧
力の差を圧力微分値が減じる役割を担うことができ、上
記検出圧力の遅れに起因して制御弁が過度に制御される
のを抑制できる。その結果、設定圧力に基づき制御弁の
制御を開始した時や、設定圧力を変更した時等に、オー
バーシュート，アンダーシュートを抑制でき、これに伴
うハンチングを防止できるとともに、設定圧力への収斂
を早くさせることができる。In the invention of claim 1, the valve control means basically adjusts the detected pressure to the set pressure based on the difference between the detected pressure from the pressure detecting means and the set pressure from the pressure setting means. , Control the control valve. The set pressure can be set to a desired level by the pressure setting means. Since the pressure detection means detects the pressure at or near the output end, the output end pressure can be accurately set to the set pressure. Due to the flow resistance between the control valve and the output end, the output end pressure changes with a delay from the change in the opening of the control valve. Excessive overshoot and undershoot appear in the output end pressure. However, in claim 1, the pressure differential value on the downstream side of the control valve is detected by the pressure differential value detection means, and the control valve is controlled based on the difference between the sum of the pressure differential value and the detected pressure and the set pressure. Control. Therefore, the pressure differential value can play a role of reducing the difference between the sum of the detected pressures and the set pressure, and it is possible to suppress the control valve from being excessively controlled due to the delay of the detected pressures. As a result, overshoot and undershoot can be suppressed when control of the control valve is started based on the set pressure, or when the set pressure is changed, and hunting accompanying this can be prevented, and convergence to the set pressure can be prevented. You can make it faster.
【０００６】請求項２では、制御弁の下流かつ近傍の検
出圧力の微分値（第２微分値）が、設定圧力に基づく制
御弁の制御開始直後や、設定圧力の変更時の直後におい
て、出力端での検出圧力と設定圧力の差を減じて制御弁
の開度変化を抑制し、しかも、これより遅れて出力端に
現れる検出圧力の微分値（第１微分値）が、この遅れ時
間経過時の検出圧力と設定圧力の差を減じて制御弁の開
度変化を抑制する。このように２つの時点での抑制効果
により、上記ハンチング防止等をより確実にすることが
でき、設定圧力への収斂をより早くさせることができ
る。請求項３では、大流量を流体通路に流す必要がある
場合に適した構成であり、主制御弁をパイロット制御弁
で制御する。この場合、主制御弁と出力端との間の流通
抵抗と、主制御弁の容量とにより、パイロット制御弁で
の制御の結果が、上記出力端圧力に遅れて現れる。この
場合でも、主制御弁の下流側の圧力微分値を用いること
により、オーバーシュート，アンダーシュートを抑制で
き、これに伴うハンチングを防止できるとともに、設定
圧力への収斂を早くさせることができる。請求項４も、
大流量を流体通路に流す必要がある場合に適した構成で
あり、パイロット制御弁の下流側の検出圧力の微分値
（第２微分値）が、設定圧力に基づく制御弁の制御開始
直後や、設定圧力の変更時の直後において、出力端での
検出圧力と設定圧力の差を減じて制御弁の開度変化を抑
制し、しかも、これより遅れて出力端に現れる検出圧力
の微分値（第１微分値）が、この遅れ時間経過時の出力
端での検出圧力と設定圧力の差を減じて制御弁の開度変
化を抑制する。このように２つの時点での抑制効果によ
り、上記ハンチング防止等をより確実にすることがで
き、設定圧力への収斂をより早くさせることができる。According to the second aspect, the differential value (second differential value) of the detected pressure downstream and near the control valve is output immediately after the control valve starts control based on the set pressure or immediately after the set pressure is changed. The difference between the detected pressure at the end and the set pressure is reduced to suppress the change in the opening of the control valve, and the differential value (first differential value) of the detected pressure that appears at the output end after this is the delay time. The difference between the detected pressure and the set pressure at the time is reduced to suppress the change in the opening of the control valve. As described above, the hunting prevention and the like can be made more reliable by the suppression effect at the two points, and the convergence to the set pressure can be made faster. According to the third aspect of the present invention, the main control valve is controlled by the pilot control valve, which is suitable for the case where a large flow rate needs to flow into the fluid passage. In this case, due to the flow resistance between the main control valve and the output end and the capacity of the main control valve, the result of the control by the pilot control valve appears later than the output end pressure. Even in this case, by using the pressure differential value on the downstream side of the main control valve, overshoot and undershoot can be suppressed, hunting accompanying this can be prevented, and convergence to the set pressure can be accelerated. Claim 4 also
The configuration is suitable when a large flow rate needs to flow through the fluid passage, and the differential value (second differential value) of the detected pressure on the downstream side of the pilot control valve is immediately after the control valve starts control based on the set pressure, Immediately after the set pressure is changed, the difference between the detected pressure at the output end and the set pressure is reduced to suppress the change in the opening of the control valve. (1 differential value) reduces the difference between the detected pressure and the set pressure at the output end when this delay time has elapsed, and suppresses the change in the opening of the control valve. As described above, the hunting prevention and the like can be made more reliable by the suppression effect at the two points, and the convergence to the set pressure can be made faster.
【０００７】請求項５も、大流量を流体通路に流す必要
がある場合に適した構成であり、少なくともパイロット
制御弁の下流側の検出圧力の微分値が、設定圧力に基づ
く制御弁の制御開始直後や、設定圧力の変更時の直後に
おいて、出力端での検出圧力と設定圧力の差を減じて制
御弁の開度変化を抑制するので、上記ハンチングを防止
でき、設定圧力への収斂を早くさせることができる。A fifth aspect of the present invention is also suitable for the case where a large flow rate needs to flow through the fluid passage, and at least the differential value of the detected pressure on the downstream side of the pilot control valve starts control of the control valve based on the set pressure. Immediately after or just after changing the set pressure, the difference between the detected pressure at the output end and the set pressure is reduced to suppress the change in the opening of the control valve, so the above hunting can be prevented and the convergence to the set pressure is accelerated. Can be made.
【０００８】[0008]
【実施例】以下、本発明の一実施例を図１を参照して説
明する。このエアリークテスタは、エア通路１０（流体
通路）を備えている。このエア通路１０の一端には、圧
縮エア源１１（圧力源）が接続され、他端は出力端１２
となっている。エア通路１０には、圧縮エア源１１の圧
力を設定圧力まで減じて出力端１２に供給する比例流量
制御弁１３が設けられている。この制御弁１３と出力端
１２との間のエア通路１０には、流量計１４が接続され
ている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. This air leak tester includes an air passage 10 (fluid passage). A compressed air source 11 (pressure source) is connected to one end of the air passage 10, and the output end 12 is connected to the other end.
Has become. The air passage 10 is provided with a proportional flow rate control valve 13 that reduces the pressure of the compressed air source 11 to a set pressure and supplies the pressure to the output end 12. A flow meter 14 is connected to the air passage 10 between the control valve 13 and the output end 12.
【０００９】上記制御弁１３を制御するための構成は以
下の通りである。圧力センサ２１（圧力検出手段）が、
出力端１２またはその近傍の圧力を検出して検出電圧を
出力する。この圧力センサ２１からの検出電圧は増幅器
２２により増幅される。また、この検出電圧は微分回路
２３（第１微分手段）により微分され、第１微分電圧Ｖ
ｆ1（第１微分値）が得られる。また、補助圧力センサ
２４（補助圧力検出手段）が制御弁１３の下流側かつ近
傍の圧力を検出する。この検出圧力は微分回路２５（第
２微分手段）により微分され、第２微分電圧Ｖｆ2（第
２微分値）が得られる。上記検出電圧Ｖｄと第１微分電
圧Ｖｆ1と第２微分電圧Ｖｆ2は、加算回路２６で加算さ
れて、差動増幅器２７（弁制御手段）の非反転入力端子
に入力される。The structure for controlling the control valve 13 is as follows. The pressure sensor 21 (pressure detection means)
The pressure at the output end 12 or in the vicinity thereof is detected to output a detection voltage. The detected voltage from the pressure sensor 21 is amplified by the amplifier 22. Further, this detected voltage is differentiated by the differentiating circuit 23 (first differentiating means) to obtain the first differential voltage V
f 1 (first differential value) is obtained. Further, the auxiliary pressure sensor 24 (auxiliary pressure detecting means) detects the pressure on the downstream side and in the vicinity of the control valve 13. This detected pressure is differentiated by the differentiating circuit 25 (second differentiating means) to obtain the second differential voltage Vf 2 (second differential value). The detection voltage Vd, the first differential voltage Vf 1 and the second differential voltage Vf 2 are added by the adding circuit 26 and input to the non-inverting input terminal of the differential amplifier 27 (valve control means).
【００１０】他方、設定電圧発生回路（圧力設定手段）
２８は、電源Ｖと、これに接続される可変抵抗器２８ａ
と、電源Ｖと可変抵抗器２８ａとの間に介在されるスイ
ッチ２８ｂを備えている。この可変抵抗器２８ａの接点
電圧が、設定圧力を表す設定電圧Ｖｒとして上記差動増
幅器２７の反転入力端子に入力される。差動増幅器２７
の出力電圧Ｖoutは制御弁１３に出力され、この制御弁
１３は、差動増幅器２７からの出力電圧Ｖoutに比例し
た流量になるように開度制御される。On the other hand, a set voltage generating circuit (pressure setting means)
28 is a power source V and a variable resistor 28a connected to the power source V.
And a switch 28b interposed between the power source V and the variable resistor 28a. The contact voltage of the variable resistor 28a is input to the inverting input terminal of the differential amplifier 27 as the set voltage Vr representing the set pressure. Differential amplifier 27
Output voltage Vout is output to the control valve 13, and the opening of the control valve 13 is controlled so that the flow rate is proportional to the output voltage Vout from the differential amplifier 27.
【００１１】上記エアリークテスタの基本的な作用を説
明する。上記出力端１２にリークテストの対象となるワ
ークを接続する。次に、設定電圧発生回路２８のスイッ
チ２８ｂをオンすることにより、設定電圧Ｖｒを発生さ
せる。この時の制御弁１３の下流側の圧力は大気圧であ
るから、増幅された検出電圧Ｖｄは設定電圧Ｖｒと大き
な差がある。そのため、差動増幅器２４からの出力電圧
Ｖoutが一方の極性（マイナス側）で大となり、これに
伴い制御弁１３の開度が大となって圧縮エア源１１から
の圧縮エアが比較的大きな流量で制御弁１３を流れる。
その結果、出力端１２に接続されたワークに圧縮エアが
供給され、ワーク内圧は急速に立ち上がる。ワーク内圧
が設定圧力になると、増幅された検出電圧Ｖｄと設定電
圧Ｖｒとの差はゼロとなり、これにより差動増幅器２４
の出力電圧はゼロとなって、制御弁１３は閉じられる。
なお、上記説明では、説明を簡略化するため微分電圧Ｖ
ｆ1，Ｖｆ2を無視して説明した。The basic operation of the air leak tester will be described. A work to be leak-tested is connected to the output terminal 12. Next, the set voltage Vr is generated by turning on the switch 28b of the set voltage generation circuit 28. Since the pressure on the downstream side of the control valve 13 at this time is atmospheric pressure, the amplified detection voltage Vd has a large difference from the set voltage Vr. Therefore, the output voltage Vout from the differential amplifier 24 becomes large in one polarity (minus side), and accordingly, the opening degree of the control valve 13 becomes large and the compressed air from the compressed air source 11 has a relatively large flow rate. Flows through the control valve 13.
As a result, compressed air is supplied to the work connected to the output end 12, and the work internal pressure rises rapidly. When the work internal pressure reaches the set pressure, the difference between the amplified detection voltage Vd and the set voltage Vr becomes zero, which causes the differential amplifier 24.
Output voltage becomes zero and the control valve 13 is closed.
In the above description, the differential voltage V is used to simplify the description.
The description was made by ignoring f 1 and Vf 2 .
【００１２】上記設定圧力でリークテストを行ってもよ
いが、可変抵抗器２８ａの操作により、上記設定電圧Ｖ
ｒを若干下げて（すなわち設定圧力を若干下げて）、制
御弁１３で排気動作を行わせてもよい。このように、設
定電圧Ｖｒを下げた時には、増幅された検出電圧Ｖｄの
方が設定電圧Ｖｒより高くなるので、差動増幅器２４か
らの出力電圧Ｖoutは上記とは逆の極性（すなわちプラ
ス側）となり、制御弁１３に排気動作（出力端１２と大
気を連通させる動作）を行わせることになる。これは、
最初にワークに圧縮空気を送り込んだ時に断熱圧縮によ
って生じたワーク温度の上昇分を、この排気動作時の断
熱膨張により低下させ、ワーク温度を安定させるためで
ある。Although a leak test may be performed at the set pressure, the set voltage V may be set by operating the variable resistor 28a.
The control valve 13 may perform the exhaust operation by slightly lowering r (that is, slightly lowering the set pressure). In this way, when the set voltage Vr is lowered, the amplified detection voltage Vd becomes higher than the set voltage Vr, so the output voltage Vout from the differential amplifier 24 has the opposite polarity (that is, the positive side). Therefore, the control valve 13 is caused to perform the exhaust operation (the operation of communicating the output end 12 with the atmosphere). this is,
This is because the increase in the work temperature caused by the adiabatic compression when the compressed air is first sent to the work is reduced by the adiabatic expansion during the exhaust operation, and the work temperature is stabilized.
【００１３】その後で、流量計１４によりワークの漏れ
の有無を判定する。すなわち、ワークに漏れがない限
り、制御弁１３の閉じ状態が維持され、流量計１４で検
出される流量はゼロである。ワークに漏れがあると、ワ
ーク内圧が低下する。この圧力低下は、圧力センサ２１
で検出され、この圧力低下分（検出電圧Ｖｄと設定電圧
Ｖｒとの差）に対応して差動増幅器２４からマイナスの
出力電圧Ｖoutが制御弁１３に供給され、この制御弁１
３が圧力低下を補うべく少し開く。その結果、エア通路
１０にエアの流れが生じ、これを流量計１４で検出する
ことにより、ワークの漏れを判定するのである。上記リ
ークテスタでは、出力端１２の近傍の圧力を検出してフ
ィードバックするので、正確に供給圧力を設定圧力にす
ることができる。After that, the flow meter 14 determines whether or not there is a work leak. That is, as long as there is no leak in the work, the closed state of the control valve 13 is maintained and the flow rate detected by the flow meter 14 is zero. If the work leaks, the internal pressure of the work decreases. This pressure drop is caused by the pressure sensor 21.
The negative output voltage Vout is supplied from the differential amplifier 24 to the control valve 13 in accordance with this pressure drop (difference between the detected voltage Vd and the set voltage Vr).
3 opens a little to make up for the pressure drop. As a result, a flow of air is generated in the air passage 10, and the flow meter 14 detects the flow of air to determine the leakage of the work. In the leak tester, the pressure in the vicinity of the output end 12 is detected and fed back, so that the supply pressure can be accurately set to the set pressure.
【００１４】ところで、制御弁１３と出力端１２との間
には、流量計１４等が配置されること等に起因して、流
通抵抗がある。この場合、圧力センサ２１で検出された
出力端１２またはその近傍の圧力を表す検出電圧Ｖｄだ
けをフィードバックして制御弁１３を制御しようとする
と、次の不都合が生じる。すなわち、上述したように、
スイッチ２８ｂをオンして制御弁１３を開き、ワークに
圧縮エアを供給する際、上記制御弁１３と出力端１２と
の間の流通抵抗に起因して、圧力センサ２１での検出電
圧Ｖｄが制御弁１３の開き動作開始から遅れて立ち上が
る。このため、差動増幅器２７の出力電圧Ｖoutは、こ
の遅れ時間において、大気圧に相当する検出電圧Ｖｄと
設定電圧Ｖｒとの差に基づいて高い電圧になり、制御弁
１３は過度に開かれる。しかも、検出電圧Ｖｒが設定電
圧Ｖｄと一致した時に、制御弁１３の閉じ動作をした
時、それまでに開き状態の制御弁１３を通過した圧縮エ
アが出力端１２に遅れて到着するため、出力端１２の圧
力が過度に上昇（オーバーシュート）する。このオーバ
ーシュートした圧力のフィードバックにより、今度は制
御弁１３は排気動作を行って圧力を下げるが、この圧力
低下は出力端１２に遅れをもって現れるため、制御弁１
３での排気動作が過度に実行され、排気動作開始時点か
ら遅れ時間をもって過度の圧力低下（オンダーシュー
ト）が出力端１２に現れる。この繰り返しによりハンチ
ングが生じりたり、検出圧力が設定圧力に収斂するのに
時間がかかってしまうのである。これと似た現象は上述
の設定電圧を下げる時にも生じる。By the way, there is a flow resistance between the control valve 13 and the output end 12 due to the flow meter 14 and the like being arranged. In this case, if the control valve 13 is controlled by feeding back only the detection voltage Vd representing the pressure at the output end 12 or its vicinity detected by the pressure sensor 21, the following inconvenience occurs. That is, as mentioned above,
When the switch 28b is turned on to open the control valve 13 and supply compressed air to the work, the detection voltage Vd at the pressure sensor 21 is controlled due to the flow resistance between the control valve 13 and the output end 12. It rises after a delay from the start of the opening operation of the valve 13. Therefore, the output voltage Vout of the differential amplifier 27 becomes a high voltage based on the difference between the detection voltage Vd corresponding to the atmospheric pressure and the set voltage Vr during this delay time, and the control valve 13 is excessively opened. Moreover, when the detected voltage Vr matches the set voltage Vd, when the control valve 13 is closed, the compressed air that has passed through the control valve 13 that has been open until then arrives at the output end 12 with a delay. The pressure at the end 12 rises excessively (overshoot). By this feedback of the overshooting pressure, the control valve 13 now performs the exhaust operation to reduce the pressure, but this pressure drop appears at the output end 12 with a delay, so the control valve 1
Exhaust operation in 3 is excessively executed, and excessive pressure drop (onder shoot) appears at the output end 12 with a delay time from the start of exhaust operation. Due to this repetition, hunting occurs, and it takes time for the detected pressure to converge on the set pressure. A phenomenon similar to this occurs even when the set voltage is lowered.
【００１５】しかし、本実施例では、フィードバックさ
れる情報は、出力端１２での検出圧力のみならず、その
微分値（第１微分値）と、制御弁１３近傍での検出圧力
の微分値（第２微分値）を含んでいる。具体的には、検
出電圧Ｖｄに、微分電圧Ｖｆ1，Ｖｆ2が加算されて差動
増幅器２７に入力され、この加算電圧と設定電圧Ｖｒの
差を増幅した電圧Ｖoutが制御弁１３に出力される。そ
のため、上記不都合が生じないのである。以下、その理
由を説明する。However, in this embodiment, the information fed back is not only the pressure detected at the output end 12, but also its differential value (first differential value) and the differential value of the detected pressure in the vicinity of the control valve 13 ( The second differential value) is included. Specifically, the differential voltages Vf 1 and Vf 2 are added to the detected voltage Vd and input to the differential amplifier 27, and the voltage Vout obtained by amplifying the difference between the added voltage and the set voltage Vr is output to the control valve 13. It Therefore, the above inconvenience does not occur. The reason will be described below.
【００１６】制御弁１３の下流かつ近傍の検出圧力の微
分電圧Ｖｆ2が、スイッチ２８ｂオンに基づく制御弁１
３の制御開始直後や、設定電圧Ｖｒの変更時の直後にお
いて、検出電圧Ｖｄと設定電圧Ｖｒの差を減じて、制御
弁１３の開度を抑制する。また、これより遅れて出力端
１２に現れる検出電圧Ｖｄの微分電圧Ｖｆ1が、この遅
れ時間経過時の検出電圧Ｖｄと設定電圧Ｖｒの差を減じ
て制御弁１３の開度を抑制する。このように２つの時点
での抑制効果により、上記オーバーシュートやアンダー
シュートを抑制でき、ひいてはハンチングを確実に防止
できるとともに、供給圧力を設定圧力へより早く収斂さ
せることができる。The differential voltage Vf 2 of the detected pressure downstream and in the vicinity of the control valve 13 is based on the switch 28b being turned on.
Immediately after the start of the control of No. 3 or immediately after the change of the set voltage Vr, the difference between the detected voltage Vd and the set voltage Vr is reduced to suppress the opening degree of the control valve 13. Further, the differential voltage Vf 1 of the detection voltage Vd appearing at the output end 12 later than this reduces the difference between the detection voltage Vd and the set voltage Vr when this delay time elapses, thereby suppressing the opening degree of the control valve 13. In this way, due to the suppression effect at the two time points, the above-mentioned overshoot and undershoot can be suppressed, hunting can be reliably prevented, and the supply pressure can be converged to the set pressure earlier.
【００１７】図２は、大容量のワークのためのエアリー
クテスタ（圧力制御装置）を示す。図２において、図１
に対応する構成には同番号を付してその説明を省略す
る。このリークテスタでは、大流量のエア流通制御が可
能な主制御弁１５がエア通路１０に設けられる。主制御
弁１５は、パイロット制御弁１６からのパイロット圧に
より制御される。パイロット制御弁１６は、圧縮エア源
１１からの圧縮エアを受け、差動増幅器２７からの出力
電圧Ｖoutにより制御される。パイロット制御弁１６と
差動増幅器２７は主制御弁１５のための弁制御手段を構
成する。このリークテスタでは、パイロット制御弁１６
の下流側の圧力が、補助圧力センサ２４により検出され
る。リークテストの方法は、図２の場合と似ているので
説明を省略する。FIG. 2 shows an air leak tester (pressure control device) for a large capacity work. In FIG. 2, FIG.
The same numbers are given to the configurations corresponding to, and the description thereof is omitted. In this leak tester, a main control valve 15 capable of controlling a large flow rate of air is provided in the air passage 10. The main control valve 15 is controlled by the pilot pressure from the pilot control valve 16. The pilot control valve 16 receives the compressed air from the compressed air source 11 and is controlled by the output voltage Vout from the differential amplifier 27. The pilot control valve 16 and the differential amplifier 27 constitute valve control means for the main control valve 15. In this leak tester, the pilot control valve 16
The pressure on the downstream side of is detected by the auxiliary pressure sensor 24. The leak test method is similar to that of FIG.
【００１８】図２では、主制御弁１５と出力端１２との
間の流通抵抗のみならず、主制御弁の容量により、パイ
ロット制御弁１６での制御の結果が、上記出力端１２の
圧力に遅れて現れる。パイロット制御弁１６の下流側の
検出圧力の微分電圧Ｖｆ2（第２微分値）が、スイッチ
２８ｂオンによる設定電圧Ｖｒに基づく主制御弁１５の
制御開始直後や、設定電圧Ｖｒの変更時の直後におい
て、出力端１２での検出電圧Ｖｄと設定電圧Ｖｒの差を
減じて主制御弁１５の開度変化を抑制し、しかも、これ
より遅れて出力端１２に現れる検出電圧Ｖｄの微分電圧
Ｖｆ2（第１微分値）が、この遅れ時間経過時の出力端
１２での検出電圧Ｖｄと設定電圧Ｖｒの差を減じて主制
御弁１５の開度変化を抑制する。このように２つの時点
での抑制効果により、上記ハンチング等をより確実に防
止することができ、設定圧力への収斂をより早くさせる
ことができる。In FIG. 2, not only the flow resistance between the main control valve 15 and the output end 12 but also the capacity of the main control valve causes the result of the control by the pilot control valve 16 to be the pressure at the output end 12. Appears late. The differential voltage Vf 2 (second differential value) of the detected pressure on the downstream side of the pilot control valve 16 is immediately after the control of the main control valve 15 is started based on the set voltage Vr when the switch 28b is turned on, or immediately after the set voltage Vr is changed. At the output terminal 12, the difference between the detected voltage Vd at the output terminal 12 and the set voltage Vr is reduced to suppress the change in the opening degree of the main control valve 15, and moreover, the differential voltage Vf 2 of the detected voltage Vd appearing at the output terminal 12 later than this. The (first differential value) reduces the difference between the detected voltage Vd at the output end 12 and the set voltage Vr when the delay time elapses, and suppresses the change in the opening degree of the main control valve 15. As described above, the hunting and the like can be more reliably prevented by the suppression effect at the two points of time, and the convergence to the set pressure can be made faster.
【００１９】図３は、エアリークテスタとは異なり、設
定圧力のエアをワークに流し続けることが要求される圧
力制御装置を示す。この圧力制御装置は、構成が図１の
実施例と似ているので、図１に対応する部位には同番号
を付してその説明を省略する。この実施例では、エア通
路４０は、２つの分岐通路４０ａ，４０ｂと、この分岐
通路４０ａ，４０ｂが下流側で合流する共通通路４０ｃ
を有している。一方の分岐通路４０ａの上流端には正圧
エア源Ｐ（圧力源）が接続され、他方の分岐通路４０ｂ
の上流端には負圧エア源Ｎ（圧力源）が接続されてい
る。FIG. 3 shows a pressure control device which, unlike the air leak tester, is required to keep the air at the set pressure flowing through the work. The structure of this pressure control device is similar to that of the embodiment shown in FIG. 1. Therefore, the parts corresponding to those in FIG. In this embodiment, the air passage 40 includes two branch passages 40a and 40b, and a common passage 40c where the branch passages 40a and 40b join on the downstream side.
have. A positive pressure air source P (pressure source) is connected to the upstream end of one branch passage 40a, and the other branch passage 40b.
A negative pressure air source N (pressure source) is connected to the upstream end of the.
【００２０】上記合流点には、比例圧力制御弁３０が配
置されている。この制御弁３０は、ケーシング３１を有
し、このケーシング３１には、互いに相対向する一対の
ノズル３２，３３が臨んでいる。ノズル３２は分岐路４
０ａの下流端に連なり、ノズル３３は分岐路４０ｂの下
流端に連なっている。また、ケーシング１１には共通通
路１０ｃの上流端に連なる出力ポート３４が設けられて
いる。ケーシング３１には、ロッド３５の中途部がシー
ルリング３８を支点として図３において上下方向に回動
可能に支持されている。このロッド３５のケーシング３
１内の一端にはノズルフラッパ３６が取り付けられてお
り、ロッド３５の他端はアクチュエータ３７に連結され
ている。このロッド３５の回動に伴って、ノズルフラッ
パ３６のノズル３２，３３に対する相対位置が制御さ
れ、これにより制御弁３０の出力ポート３４の圧力を制
御するようになっている。A proportional pressure control valve 30 is arranged at the confluence point. The control valve 30 has a casing 31, and a pair of nozzles 32 and 33 facing each other faces the casing 31. Nozzle 32 is branch path 4
0a is connected to the downstream end, and the nozzle 33 is connected to the downstream end of the branch passage 40b. Further, the casing 11 is provided with an output port 34 connected to the upstream end of the common passage 10c. A midway portion of the rod 35 is supported by the casing 31 so as to be vertically rotatable in FIG. 3 with a seal ring 38 as a fulcrum. Casing 3 of this rod 35
A nozzle flapper 36 is attached to one end of the rod 1, and the other end of the rod 35 is connected to an actuator 37. With the rotation of the rod 35, the relative position of the nozzle flapper 36 with respect to the nozzles 32 and 33 is controlled, whereby the pressure of the output port 34 of the control valve 30 is controlled.
【００２１】上記実施例では、出力端１２の圧力が設定
圧力を維持された状態で、エアが出力端１２に接続され
たワーク等に供給される。圧力の制御については、図１
の実施例と同様であるので省略する。なお、差動増幅器
２７とアクチュエータ３７との間には、微小のふらつき
を防止するための積分回路４５が介在されている。ま
た、分岐通路１０ａには電磁レギュレータ４６が介在さ
れている。In the above embodiment, air is supplied to the work or the like connected to the output end 12 while the pressure at the output end 12 is maintained at the set pressure. For pressure control, see Fig. 1.
Since it is the same as the embodiment described above, the description thereof will be omitted. An integrating circuit 45 for preventing minute fluctuations is interposed between the differential amplifier 27 and the actuator 37. An electromagnetic regulator 46 is interposed in the branch passage 10a.
【００２２】図４は、エアリークテスタとは異なり、設
定圧力のエアをワークに大容量で流し続けることが要求
される圧力制御装置を示す。この圧力制御装置は、構成
が図３の実施例と似ているので、図３に対応する部位に
は同番号を付してその説明を省略する。ここでは、エア
通路１０に、大容量の主制御弁５０が設けられている。
この主制御弁５０は、ケーシング５１を有し、このケー
シング５１は、エア通路１０の中間部に位置する弁口５
２を備えている。この弁口５２は弁体５３により開度制
御される。この弁体５３はダイヤフラム５４に連結され
ている。このダイヤフラム５４は、ケーシング４１に形
成された空間を２つの圧力導入室５５，５６に仕切るも
のである。一方の圧力導入室５５には、出力端１２近傍
の圧力が導入される。他方の圧力導入室５５には、図３
の制御弁と同一構成のパイロット制御弁３０からのパイ
ロット圧が導入され、圧力バランスが得られる。FIG. 4 shows a pressure control device which, unlike the air leak tester, is required to continue flowing a large amount of air at a set pressure to a work. The structure of this pressure control device is similar to that of the embodiment shown in FIG. 3. Therefore, the parts corresponding to those in FIG. Here, a large-capacity main control valve 50 is provided in the air passage 10.
The main control valve 50 has a casing 51, and the casing 51 has a valve opening 5 located at an intermediate portion of the air passage 10.
Equipped with 2. The opening of the valve opening 52 is controlled by the valve body 53. The valve body 53 is connected to the diaphragm 54. The diaphragm 54 partitions the space formed in the casing 41 into two pressure introduction chambers 55 and 56. The pressure in the vicinity of the output end 12 is introduced into one pressure introduction chamber 55. In the other pressure introducing chamber 55, as shown in FIG.
The pilot pressure is introduced from the pilot control valve 30 having the same configuration as that of the control valve No. 1, and pressure balance is obtained.
【００２３】図４の実施例では、圧力制御に関しては図
２と似ているので、詳しい説明は省略する。パイロット
制御弁３０からのパイロット圧により弁体５３が制御さ
れ、圧縮エア源１１の圧縮エアが出力端１２で設定圧力
に維持されるように弁口５２の開度が制御される。In the embodiment of FIG. 4, the pressure control is similar to that of FIG. 2, and therefore detailed description will be omitted. The valve body 53 is controlled by the pilot pressure from the pilot control valve 30, and the opening degree of the valve port 52 is controlled so that the compressed air of the compressed air source 11 is maintained at the set pressure at the output end 12.
【００２４】本発明は上記実施例に制約されず、種々の
態様が可能である、例えば、図１，図２の装置は、エア
リークテスタとしてではなく単なる空圧源として用いて
もよいことは勿論である。図１〜図４の実施例におい
て、微分回路２３は省いてもよく、補助圧力検出センサ
２４と微分回路２５だけで、微分電圧を得てもよい。こ
れとは逆に、補助圧力検出センサ２４と微分回路２５を
省き、微分回路２３のみで微分出力を得てもよい。流体
として、エアの代わりに液体を用いてもよい。The present invention is not limited to the above embodiment, and various modes are possible. For example, the device of FIGS. 1 and 2 may be used not as an air leak tester but as a simple air pressure source. Is. 1 to 4, the differentiating circuit 23 may be omitted, and the differential voltage may be obtained only by the auxiliary pressure detection sensor 24 and the differentiating circuit 25. On the contrary, the auxiliary pressure detection sensor 24 and the differentiating circuit 25 may be omitted, and the differentiating circuit 23 alone may obtain the differentiating output. A liquid may be used instead of air as the fluid.
【００２５】[0025]
【発明の効果】請求項１の発明において、設定圧力は、
圧力設定手段で所望レベルに設定できる。圧力検出手段
は、出力端またはその近傍の圧力を検出するので、正確
に出力端圧力を設定圧力にすることができる。しかも、
制御弁の下流側の圧力微分値を圧力微分値検出手段で検
出し、この圧力微分値と上記検出圧力の和と、上記設定
圧力との差に基づいて制御弁を制御することにより、設
定圧力に基づき制御弁の制御を開始した時や、設定圧力
を変更した時等に、オーバーシュート，アンダーシュー
トを抑制でき、これに伴うハンチングを防止できるとと
もに、設定圧力への収斂を早くさせることができる。請
求項２では、出力端に現れる検出圧力の第１微分値と、
制御弁の下流かつ近傍の検出圧力の第２微分値を用いる
ことにより、上記ハンチング防止等をより確実にするこ
とができ、設定圧力への収斂をより早くさせることがで
きる。請求項３では、大流量を流体通路に流す必要があ
る場合に適した構成であり、主制御弁の下流側の圧力微
分値を用いることにより、オーバーシュート，アンダー
シュートを抑制でき、これに伴うハンチングを防止でき
るとともに、設定圧力への収斂を早くさせることができ
る。請求項４も、大流量を流体通路に流す必要がある場
合に適した構成であり、出力端に現れる検出圧力の第１
微分値と、パイロット制御弁の下流側の検出圧力の第２
微分値とを用いることにより、上記ハンチング防止等を
より確実にすることができ、設定圧力への収斂をより早
くさせることができる。請求項５も、大流量を流体通路
に流す必要がある場合に適した構成であり、少なくとも
パイロット制御弁の下流側の検出圧力の微分値を用いる
ことにより、上記ハンチングを防止でき、設定圧力への
収斂を早くさせることができる。According to the invention of claim 1, the set pressure is
It can be set to a desired level by the pressure setting means. Since the pressure detection means detects the pressure at or near the output end, the output end pressure can be accurately set to the set pressure. Moreover,
The pressure differential value on the downstream side of the control valve is detected by the pressure differential value detection means, and the control valve is controlled based on the difference between the pressure differential value and the detected pressure, and the set pressure to set the set pressure. It is possible to suppress overshoot and undershoot when starting control of the control valve on the basis of, or when changing the set pressure, prevent hunting accompanying this, and speed up convergence to the set pressure. . In claim 2, the first differential value of the detected pressure appearing at the output end,
By using the second differential value of the detected pressure on the downstream side and in the vicinity of the control valve, the hunting prevention and the like can be made more reliable, and the convergence to the set pressure can be made faster. According to the third aspect, the configuration is suitable when a large flow rate needs to flow through the fluid passage, and by using the pressure differential value on the downstream side of the main control valve, it is possible to suppress overshoot and undershoot. Hunting can be prevented, and convergence to the set pressure can be accelerated. Claim 4 is also a configuration suitable for the case where a large flow rate needs to flow through the fluid passage, and the first detected pressure that appears at the output end
The second of the differential value and the detected pressure on the downstream side of the pilot control valve.
By using the differential value, it is possible to more reliably prevent the hunting and the like, and it is possible to more quickly converge on the set pressure. A fifth aspect of the present invention is also suitable for the case where a large flow rate needs to flow through the fluid passage, and by using at least the differential value of the detected pressure on the downstream side of the pilot control valve, the hunting can be prevented and the set pressure is increased. Can be quickly converged.
【図１】本発明の第１実施例を示す回路図である。FIG. 1 is a circuit diagram showing a first embodiment of the present invention.
【図２】本発明の第２実施例を示す回路図である。FIG. 2 is a circuit diagram showing a second embodiment of the present invention.
【図３】本発明の第３実施例を示す回路図である。FIG. 3 is a circuit diagram showing a third embodiment of the present invention.
【図４】本発明の第４実施例を示す回路図である。FIG. 4 is a circuit diagram showing a fourth embodiment of the present invention.
【図５】従来の圧力制御装置としてのエアリークテスタ
を示す概略図である。FIG. 5 is a schematic view showing an air leak tester as a conventional pressure control device.
１０ … エア通路（流体通路） １１ … 圧縮エア源（圧力源） １２ … 出力端 １３ … 制御弁 １５ … 主制御弁 １６ … パイロット圧制御弁 ２１ … 圧力センサ（圧力検出手段） ２３ … 微分回路（第１微分手段） ２４ … 補助圧力センサ（補助圧力検出手段） ２５ … 微分回路（第２微分手段） ２７ … 弁制御手段 ２８ … 設定電圧発生回路（圧力設定手段） ３０ … 制御弁，パイロット制御弁 ４０ … エア通路（流体通路） ５０ … 主制御弁 10 Air passage (fluid passage) 11 Compressed air source (pressure source) 12 Output end 13 Control valve 15 Main control valve 16 Pilot pressure control valve 21 Pressure sensor (pressure detection means) 23 Differentiation circuit ( First differentiation means 24 ... Auxiliary pressure sensor (auxiliary pressure detection means) 25 ... Differentiation circuit (second differentiation means) 27 ... Valve control means 28 ... Set voltage generation circuit (pressure setting means) 30 ... Control valve, pilot control valve 40 ... Air passage (fluid passage) 50 ... Main control valve
Claims (5)
が接続され他端が出力端として提供される流体通路と、
（ハ）流体通路に設けられた制御弁と、（ニ）上記出力
端またはその近傍の圧力を検出する圧力検出手段と、
（ホ）上記制御弁の下流側の圧力の微分値を検出する圧
力微分値検出手段と、（ヘ）圧力を設定する圧力設定手
段と、（ト）上記検出圧力と上記圧力微分値の和と、上
記設定圧力との差に基づいて、上記制御弁を制御するこ
とにより出力端圧力を設定圧力に一致させる弁制御手段
と、を備えたことを特徴とする圧力制御装置。1. A pressure source; and (b) a fluid passage having one end connected to the pressure source and the other end provided as an output end.
(C) a control valve provided in the fluid passage, and (d) a pressure detecting means for detecting the pressure at or near the output end,
(E) Pressure differential value detecting means for detecting the differential value of the pressure on the downstream side of the control valve, (f) pressure setting means for setting the pressure, and (g) the sum of the detected pressure and the pressure differential value. And a valve control unit that controls the control valve based on a difference from the set pressure to match the output end pressure with the set pressure.
出手段の検出圧力を微分することにより第１微分値を得
る第１微分手段と、上記制御弁の下流かつ近傍の圧力を
検出する補助圧力検出手段と、この補助圧力検出手段か
らの検出圧力を微分することにより第２微分値を得る第
２微分手段とを備え、これら第１微分値と第２微分値の
和が上記圧力微分値として提供されることを特徴とする
請求項１に記載の圧力制御装置。2. A first differential means for obtaining a first differential value by differentiating the pressure detected by the pressure detecting means by the pressure differential value detecting means, and an auxiliary for detecting pressure in the vicinity of and downstream of the control valve. The pressure detecting means and the second differentiating means for obtaining the second differential value by differentiating the detected pressure from the auxiliary pressure detecting means are provided, and the sum of the first differential value and the second differential value is the pressure differential value. The pressure control device according to claim 1, wherein the pressure control device is provided as.
上記弁制御手段が、この主制御弁にパイロット圧を供給
して主制御弁を制御するパイロット制御弁と、このパイ
ロット制御弁を上記差に基づいて制御するパイロット圧
制御手段とを備えていることを特徴とする請求項１に記
載の圧力制御装置。3. The control valve is provided as a main control valve,
The valve control means includes a pilot control valve that supplies pilot pressure to the main control valve to control the main control valve, and pilot pressure control means that controls the pilot control valve based on the difference. The pressure control device according to claim 1, wherein:
出手段の検出圧力を微分することにより第１微分値を得
る第１微分手段と、上記パイロット制御弁の下流かつ近
傍の圧力を検出する補助圧力検出手段と、この補助圧力
検出手段からの検出圧力を微分することにより第２微分
値を得る第２微分手段とを備え、これら第１微分値と第
２微分値の和が上記圧力微分値として提供されることを
特徴とする請求項３に記載の圧力制御装置。4. The pressure differential value detecting means detects a first differential means for obtaining a first differential value by differentiating the pressure detected by the pressure detecting means, and a pressure downstream and in the vicinity of the pilot control valve. The auxiliary pressure detecting means and the second differentiating means for obtaining the second differential value by differentiating the detected pressure from the auxiliary pressure detecting means are provided, and the sum of the first differential value and the second differential value is the pressure differential. The pressure control device according to claim 3, wherein the pressure control device is provided as a value.
が接続され他端が出力端として提供される流体通路と、
（ハ）上記流体通路に設けられた主制御弁と、（ニ）上
記主制御弁にパイロット圧を供給してこの主制御弁を制
御するパイロット制御弁と、（ホ）上記出力端またはそ
の近傍の圧力を検出する圧力検出手段と、（ヘ）上記パ
イロット制御弁の下流側の圧力を検出する補助圧力検出
手段と、（ト）上記補助圧力検出手段からの圧力を微分
して圧力微分値を検出する微分手段と、（チ）圧力を設
定する圧力設定手段と、（リ）上記検出圧力と上記圧力
微分値の和と、上記設定圧力との差に基づいて、上記パ
イロット制御弁を制御し、ひいては主制御弁を制御する
ことにより出力端圧力を設定圧力に一致させるパイロッ
ト圧制御手段と、を備えたことを特徴とする圧力制御装
置。5. A pressure source; and (b) a fluid passage having one end connected to the pressure source and the other end provided as an output end.
(C) A main control valve provided in the fluid passage, (d) a pilot control valve that supplies pilot pressure to the main control valve to control the main control valve, and (e) the output end or its vicinity. Pressure detection means for detecting the pressure of the pilot control valve, (f) auxiliary pressure detection means for detecting the pressure on the downstream side of the pilot control valve, and (g) the pressure from the auxiliary pressure detection means is differentiated to obtain a pressure differential value. Differentiating means for detecting, (h) pressure setting means for setting pressure, (i) controlling the pilot control valve based on the difference between the detected pressure and the pressure differential value and the set pressure. And a pilot pressure control means for matching the output end pressure with the set pressure by controlling the main control valve, and a pressure control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6112079A JP2618368B2 (en) | 1994-04-27 | 1994-04-27 | Pressure control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6112079A JP2618368B2 (en) | 1994-04-27 | 1994-04-27 | Pressure control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07295657A true JPH07295657A (en) | 1995-11-10 |
| JP2618368B2 JP2618368B2 (en) | 1997-06-11 |
Family
ID=14577560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6112079A Expired - Lifetime JP2618368B2 (en) | 1994-04-27 | 1994-04-27 | Pressure control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2618368B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017170647A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社フジキン | Pressure control device and pressure control system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5379189A (en) * | 1976-12-22 | 1978-07-13 | Matsushita Electric Ind Co Ltd | Temperature control device |
| JPS5430384A (en) * | 1977-08-10 | 1979-03-06 | Toshiba Corp | Position-setting servo apparatus |
| JPS6356701A (en) * | 1986-08-28 | 1988-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | Boiler steam temperature advance control device |
| JPH01306905A (en) * | 1988-06-03 | 1989-12-11 | Osaka Gas Co Ltd | Pressure control method |
| JPH02226312A (en) * | 1989-02-27 | 1990-09-07 | Kurimoto Ltd | Automatic set reducing valve |
| JPH04309313A (en) * | 1991-04-08 | 1992-10-30 | Takara Standard Co Ltd | Hot water temperature controller and shower unit using the same |
| JPH05313755A (en) * | 1992-05-08 | 1993-11-26 | Tlv Co Ltd | Automatic set pressure reducing valve device |
-
1994
- 1994-04-27 JP JP6112079A patent/JP2618368B2/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5379189A (en) * | 1976-12-22 | 1978-07-13 | Matsushita Electric Ind Co Ltd | Temperature control device |
| JPS5430384A (en) * | 1977-08-10 | 1979-03-06 | Toshiba Corp | Position-setting servo apparatus |
| JPS6356701A (en) * | 1986-08-28 | 1988-03-11 | Ishikawajima Harima Heavy Ind Co Ltd | Boiler steam temperature advance control device |
| JPH01306905A (en) * | 1988-06-03 | 1989-12-11 | Osaka Gas Co Ltd | Pressure control method |
| JPH02226312A (en) * | 1989-02-27 | 1990-09-07 | Kurimoto Ltd | Automatic set reducing valve |
| JPH04309313A (en) * | 1991-04-08 | 1992-10-30 | Takara Standard Co Ltd | Hot water temperature controller and shower unit using the same |
| JPH05313755A (en) * | 1992-05-08 | 1993-11-26 | Tlv Co Ltd | Automatic set pressure reducing valve device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017170647A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社フジキン | Pressure control device and pressure control system |
| TWI641937B (en) * | 2016-03-30 | 2018-11-21 | 日商富士金股份有限公司 | Pressure control device and pressure control system |
| US10684632B2 (en) | 2016-03-30 | 2020-06-16 | Fujikin Incorporated | Pressure control device and pressure control system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2618368B2 (en) | 1997-06-11 |
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