JP4491834B2 - Pressure detector and clogging diagnosis method for pressure detector - Google Patents
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本発明は、高圧側導圧管と低圧側導圧管との差圧と静圧とを検出する圧力検出器及び圧力検出器の詰まり診断方法に関し、特に、導圧管の詰まりを診断する圧力検出器及び圧力検出器の詰まり診断方法に関する。 The present invention relates to a pressure detector for detecting a differential pressure and a static pressure between a high pressure side pressure guiding tube and a low pressure side pressure guiding tube, and a clogging diagnosis method for the pressure detector, and in particular, a pressure detector for diagnosing clogging of the pressure guiding tube and The present invention relates to a clogging diagnosis method for a pressure detector.
従来の管路閉塞検出装置は、差圧信号の揺動と静圧信号の揺動との相関関係から導圧管の一方又は両方の詰まり状態を検出するものもある（例えば、特許文献１参照。）。 Some conventional pipe blockage detection devices detect a clogged state of one or both of the pressure guiding pipes from the correlation between the fluctuation of the differential pressure signal and the fluctuation of the static pressure signal (see, for example, Patent Document 1). ).
このような従来の圧力検出器（差圧伝送器）の構成について説明する。
高圧側導圧管と低圧側導圧管との圧力を検出する第１センサと、高圧側導圧管と低圧側導圧管との圧力を検出する第２センサとを備える（図示せず）。また、第１センサと第２センサとは一体に形成する。
The configuration of such a conventional pressure detector (differential pressure transmitter) will be described.
A first sensor for detecting the pressure of the high pressure side pressure guiding tube and the low pressure side pressure guiding tube, and a second sensor for detecting the pressure of the high pressure side pressure guiding tube and the low pressure side pressure guiding tube (not shown). Further, the first sensor and the second sensor are integrally formed.
具体的には、第１センサと第２センサとは、振動式センサで形成し、１チップの半導体素子に形成する。そして、第１センサは周波数Fcを出力し、第２センサは周波数Frを出力する。 Specifically, the first sensor and the second sensor are formed by vibration sensors, and are formed on a one-chip semiconductor element. The first sensor outputs the frequency Fc, and the second sensor outputs the frequency Fr.
また、高圧側導圧管と低圧側導圧管との静圧に基づく静圧信号Spは、例えば、以下の式で定義する。ただし、定数Apは所定の定数とする。
Sp＝Fc2＋Ap・Fr2 （１）
Moreover, the static pressure signal Sp based on the static pressure of the high pressure side pressure guiding tube and the low pressure side pressure guiding tube is defined by the following equation, for example. However, the constant Ap is a predetermined constant.
Sp = Fc 2 + Ap · Fr 2 (1)
さらに、高圧側導圧管と低圧側導圧管との差圧に基づく差圧信号Dpは、例えば、以下の式で定義する。ただし、定数Bpは所定の定数とする。
Dp＝Fc2−Bp・Fr2 （２）
Furthermore, the differential pressure signal Dp based on the differential pressure between the high pressure side pressure guiding tube and the low pressure side pressure guiding tube is defined by the following equation, for example. However, the constant Bp is a predetermined constant.
Dp ＝ Fc 2 −Bp ・ Fr 2 (2)
このように、演算手段は、周波数Fcと周波数Frとから差圧信号Dpと静圧信号Spとを生成する。そして、静圧信号Spと差圧信号Dpとは同時に算出できる。また、例えば、高圧側導圧管の圧力を静圧信号Spとなるように、定数Apを設定する。 In this way, the calculation means generates the differential pressure signal Dp and the static pressure signal Sp from the frequency Fc and the frequency Fr. The static pressure signal Sp and the differential pressure signal Dp can be calculated simultaneously. Further, for example, the constant Ap is set so that the pressure of the high-pressure side impulse line becomes the static pressure signal Sp.
このような従来の圧力検出器の動作を説明する。
高圧側導圧管の詰まりが発生した場合、高圧側導圧管の圧力の揺動は小さくなる。また、低圧側導圧管の詰まりが発生した場合、低圧側導圧管の圧力の揺動は小さくなる。
The operation of such a conventional pressure detector will be described.
When the high pressure side impulse line is clogged, the fluctuation of the pressure of the high pressure side impulse line is reduced. Further, when the low pressure side pressure guiding tube is clogged, the fluctuation of the pressure of the low pressure side pressure guiding tube is reduced.
しかしながら、従来の圧力検出器は、高圧側導圧管のみの詰まりと低圧側導圧管のみの詰まりとの実用的な診断が困難という課題がある。 However, the conventional pressure detector has a problem that it is difficult to make a practical diagnosis of clogging of only the high-pressure side impulse line and clogging of only the low-pressure side impulse line.
詳しくは、高圧側導圧管のみの詰まりの場合、静圧信号Spは、第１センサと第２センサとを１チップの半導体素子に形成するため、低圧側導圧管の圧力の揺動の影響を受けて揺動する。 Specifically, in the case of clogging only the high-pressure side impulse line, the static pressure signal Sp forms the first sensor and the second sensor in a single-chip semiconductor element, so that the influence of fluctuations in the pressure of the low-pressure side impulse line is affected. Swing when received.
また、低圧側導圧管のみの詰まりの場合、静圧信号Spの揺動の感度は、高圧側導圧管の圧力の揺動に対して差圧の影響を抑制される関係にあるため、小さくなる。 Also, in the case of clogging only the low pressure side impulse line, the sensitivity of fluctuation of the static pressure signal Sp is small because the influence of the differential pressure is suppressed with respect to fluctuation of the pressure of the high pressure side impulse line. .
このため、差圧信号の揺動と静圧信号の揺動との相関関係を検出することは容易ではなく、高圧側導圧管のみの詰まりと、低圧側導圧管のみの詰まりとを容易に診断することはできない。 For this reason, it is not easy to detect the correlation between the fluctuation of the differential pressure signal and the fluctuation of the static pressure signal, and it is easy to diagnose clogging of only the high-pressure side impulse line and clogging of only the low-pressure side impulse line. I can't do it.
本発明の目的は、以上説明した課題を解決するものであり、高圧側導圧管の詰まりの発生と、低圧側導圧管の詰まりの発生とを簡便・正確に診断可能な圧力検出器及び圧力検出器の詰まり診断方法を提供することにある。 An object of the present invention is to solve the above-described problems, and a pressure detector and a pressure detection capable of easily and accurately diagnosing occurrence of clogging of a high-pressure side impulse line and occurrence of clogging of a low-pressure side impulse line An object of the present invention is to provide a device clogging diagnosis method.
このような目的を達成する本発明は、次の通りである。
（１）ダイアフラムの中央部分に形成され、高圧側導圧管の圧力と低圧側導圧管の圧力とに係る第１の周波数（Ｆｃ）を出力する振動式の第１センサと、前記ダイアフラムの周辺部分に形成され、前記高圧側導圧管の圧力と前記低圧側導圧管の圧力とに係る第２の周波数（Ｆｒ）を出力し、前記第１センサと一体に形成する振動式の第２センサと、前記第１の周波数（Ｆｃ）と前記第２の周波数（Ｆｒ）とから差圧信号（Ｄｐ）と静圧信号とを生成する演算手段とを備える圧力検出器において、前記演算手段は、前記低圧側導圧管の圧力を一定とし前記高圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（３）の第１の定数（Ａｐ１）を用いて算出される第１の静圧信号（Ｓｐ１）の揺動（Ｆｓｐ１（ｎ），Ｆｓｐ１'（ｎ））の分散（Ｖａｓｐ１）と、前記高圧側導圧管の圧力を一定とし前記低圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（７）の第２の定数（Ａｐ２）を用いて算出される第２の静圧信号（Ｓｐ２）の揺動（Ｆｓｐ２（ｎ），Ｆｓｐ２'（ｎ））の分散（Ｖａｓｐ２）とから、前記高圧側導圧管の詰まりと、前記低圧側導圧管の詰まりとをそれぞれ診断することを特徴とする圧力検出器。
Ｓｐ１＝Ｆｃ 2 ＋Ａｐ１・Ｆｒ 2 （３）
Ｓｐ２＝Ｆｃ 2 ＋Ａｐ２・Ｆｒ 2 （７）
The present invention which achieves such an object is as follows.
(1) A vibration-type first sensor that is formed in the central portion of the diaphragm and outputs a first frequency (Fc) related to the pressure of the high-pressure side pressure guiding tube and the pressure of the low-pressure side pressure guiding tube, and the peripheral portion of the diaphragm A vibration-type second sensor that is formed integrally with the first sensor, and outputs a second frequency (Fr) relating to the pressure of the high-pressure side impulse line and the pressure of the low-pressure side impulse line; In the pressure detector comprising a calculation means for generating a differential pressure signal (Dp) and a static pressure signal from the first frequency (Fc) and the second frequency (Fr), the calculation means includes the low pressure following formula static pressure signal is constant when only the pressure of the high pressure side impulse line and the pressure Gawashirube pressure pipe with constant changes (3) a first constant first calculated using (Ap1) Fluctuation of the static pressure signal (Sp1) (Fsp1 (n), Fsp1 ′ (n )) And variance (Vasp1) of said second constant of following formula static pressure signal is constant when only the pressure of the high pressure side impulse line and a constant pressure of the low pressure side impulse line is changed (7) ( From the variance (Vasp2) of the fluctuation (Fsp2 (n), Fsp2 ′ (n)) of the second static pressure signal (Sp2) calculated using Ap2), the clogging of the high-pressure side impulse line, A pressure detector for diagnosing clogging of a low-pressure side impulse line.
Sp1 = Fc 2 + Ap1 · Fr 2 (3)
Sp2 = Fc 2 + Ap2 · Fr 2 (7)
（２）前記第１の静圧信号（Ｓｐ１）は前記第１センサの前記第１の周波数（Ｆｃ）の２乗と前記第２センサの前記第２の周波数（Ｆｒ）の２乗と前記第１の定数（Ａｐ１）とから生成され、前記第２の静圧信号（Ｓｐ２）は前記第１センサの前記第１の周波数（Ｆｃ）の２乗と前記第２センサの前記第２の周波数（Ｆｒ）の２乗と前記第２の定数（Ａｐ２）とから生成されることを特徴とする（１）記載の圧力検出器。
(2) The first static pressure signal (Sp1) includes the square of the first frequency (Fc) of the first sensor, the square of the second frequency (Fr) of the second sensor, and the second . The second static pressure signal (Sp2) is generated from the constant of the first sensor (Ap1), and the second static pressure signal (Sp2) is the square of the first frequency (Fc) of the first sensor and the second frequency of the second sensor ( The pressure detector according to (1), which is generated from the square of Fr) and the second constant (Ap2).
（３）ダイアフラムの中央部分に形成され、高圧側導圧管の圧力と低圧側導圧管の圧力とに係る第１の周波数（Ｆｃ）を出力する振動式の第１センサと、前記ダイアフラムの周辺部分に形成され、前記高圧側導圧管の圧力と前記低圧側導圧管の圧力とに係る第２の周波数（Ｆｒ）を出力し、前記第１センサと一体に形成する振動式の第２センサと、前記第１の周波数（Ｆｃ）と前記第２の周波数（Ｆｒ）とから差圧信号（Ｄｐ）と静圧信号とを生成する演算手段とを備える圧力検出器の詰まり診断方法において、前記低圧側導圧管の圧力を一定とし前記高圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（３）の第１の定数（Ａｐ１）と、前記高圧側導圧管の圧力を一定とし前記低圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（７）の第２の定数（Ａｐ２）とを定めるステップ、前記第１の定数（Ａｐ１）を用いて算出される第１の静圧信号（Ｓｐ１）の揺動（Ｆｓｐ１（ｎ），Ｆｓｐ１'（ｎ））の分散（Ｖａｓｐ１）と、前記第２の定数（Ａｐ２）を用いて算出される第２の静圧信号（Ｓｐ２）の揺動（Ｆｓｐ２（ｎ），Ｆｓｐ２'（ｎ））の分散（Ｖａｓｐ２）とから、前記高圧側導圧管の詰まりと、前記低圧側導圧管の詰まりとをそれぞれ診断するステップ、とを備えることを特徴とする圧力検出器の詰まり診断方法。
Ｓｐ１＝Ｆｃ 2 ＋Ａｐ１・Ｆｒ 2 （３）
Ｓｐ２＝Ｆｃ 2 ＋Ａｐ２・Ｆｒ 2 （７）
(3) A vibration-type first sensor that is formed in the central portion of the diaphragm and outputs a first frequency (Fc) related to the pressure of the high-pressure side impulse line and the pressure of the low-pressure side impulse line, and the peripheral portion of the diaphragm A vibration-type second sensor that is formed integrally with the first sensor, and outputs a second frequency (Fr) relating to the pressure of the high-pressure side impulse line and the pressure of the low-pressure side impulse line; In the clogging diagnosis method for a pressure detector, comprising: a calculation means for generating a differential pressure signal (Dp) and a static pressure signal from the first frequency (Fc) and the second frequency (Fr). following formula static pressure signal is constant when only the pressure of the high pressure side impulse line and the pressure impulse lines with constant changes with the first constant of (3) (Ap1), the pressure of the high pressure side impulse line When the pressure is constant and only the pressure in the low-pressure side impulse line changes Following formula pressure signal is constant (7) a second constant (Ap2) defining a step, a first static pressure signal that is calculated using the first constant (Ap1) of oscillation of (Sp1) Fluctuation (Fsp2 (n)) of the second static pressure signal (Sp2) calculated using the variance (Vasp1) of (Fsp1 (n), Fsp1 ′ (n)) and the second constant (Ap2) , Fsp2 ′ (n)), and a step of diagnosing clogging of the high-pressure side pressure guiding tube and clogging of the low-pressure side pressure guiding tube, respectively, from the dispersion (Vasp2) of the pressure detector, Clogging diagnosis method.
Sp1 = Fc 2 + Ap1 · Fr 2 (3)
Sp2 = Fc 2 + Ap2 · Fr 2 (7)
以上説明したことから明らかなように、本発明によれば次のような効果がある。
本発明によれば、高圧側導圧管の詰まりの発生と、低圧側導圧管の詰まりの発生とを簡便・正確に診断可能な圧力検出器及び圧力検出器の詰まり診断方法を提供できる。
As is apparent from the above description, the present invention has the following effects.
According to the present invention, it is possible to provide a pressure detector and a pressure detector clogging diagnosis method capable of easily and accurately diagnosing occurrence of clogging of a high-pressure side impulse line and occurrence of clogging of a low-pressure side impulse line.
以下に本発明を詳細に説明する。
本発明の圧力検出器の特徴は、高圧側導圧管の圧力に基づく静圧信号Spの揺動の分散と、低圧側導圧管の圧力に基づく静圧信号Spの揺動の分散とから、高圧側導圧管の詰まりと、低圧側導圧管の詰まりと、を診断する点にある。
The present invention is described in detail below.
The feature of the pressure detector of the present invention is that the dispersion of the fluctuation of the static pressure signal Sp based on the pressure of the high pressure side impulse line and the dispersion of the fluctuation of the static pressure signal Sp based on the pressure of the low pressure side impulse line are The point is to diagnose clogging of the side pressure guiding pipe and clogging of the low pressure side pressure guiding pipe.
本発明の圧力検出器の構成は、従来の圧力検出器の構成と同様に、第１センサと、第２センサと、演算手段とを備える（図示せず）。また、第１センサと第２センサとは一体に形成する。 The configuration of the pressure detector of the present invention includes a first sensor, a second sensor, and a calculation means (not shown), similarly to the configuration of the conventional pressure detector. Further, the first sensor and the second sensor are integrally formed.
具体的には、第１センサと第２センサとは、振動式センサで形成し、１チップの半導体素子に形成する。また、第１センサは圧力検出器のダイアフラム（図示せず）の中央部分に形成し、第２センサはこのダイアフラムの周辺部分に形成する。そして、第１センサは周波数Fcを出力し、第２センサは周波数Frを出力する。 Specifically, the first sensor and the second sensor are formed by vibration sensors, and are formed on a one-chip semiconductor element. The first sensor is formed in the central portion of the pressure detector diaphragm (not shown), and the second sensor is formed in the peripheral portion of the diaphragm. The first sensor outputs the frequency Fc, and the second sensor outputs the frequency Fr.
まず、低圧側導圧管の圧力を一定とし、高圧側導圧管の圧力のみが変化する場合を説明する。例えば、低圧側導圧管の圧力は99kPaとし、高圧側導圧管の圧力は101kPaから102kPaに変化する。 First, the case where the pressure of the low pressure side pressure guiding tube is constant and only the pressure of the high pressure side pressure guiding tube changes will be described. For example, the pressure of the low pressure side pressure guiding tube is 99 kPa, and the pressure of the high pressure side pressure guiding tube changes from 101 kPa to 102 kPa.
このとき、定数Ap1の値を所定の値とすると静圧信号Sp1が一定となる。また、静圧信号Sp1は、第１センサの出力の２乗と第２センサの出力の２乗と所定の定数Ap1とから生成し、例えば、以下の式（３）で定義する。
Sp1＝Fc2＋Ap1・Fr2 （３）
At this time, if the value of the constant Ap1 is a predetermined value, the static pressure signal Sp1 becomes constant. The static pressure signal Sp1 is generated from the square of the output of the first sensor, the square of the output of the second sensor, and a predetermined constant Ap1, and is defined by, for example, the following equation (3).
Sp1 = Fc 2 + Ap1 · Fr 2 (3)
即ち、静圧信号Sp1は、高圧側導圧管の圧力の変化から影響を受けにくい。そして、静圧信号Sp1は、低圧側導圧管の圧力に基づく値となる。即ち、静圧信号Sp1は、低圧側導圧管の圧力の変化及び揺動を示す値となる。 That is, the static pressure signal Sp1 is not easily affected by a change in the pressure of the high pressure side pressure guiding tube. The static pressure signal Sp1 is a value based on the pressure of the low pressure side pressure guiding tube. That is, the static pressure signal Sp1 is a value indicating the change and swing of the pressure of the low pressure side pressure guiding tube.
また、このとき、差圧信号Dp1は、2kPa（101kPa−99kPa）から3kPa（102kPa−99kPa）へ変化する。さらにまた、高圧側導圧管の圧力の変化により、第１センサと第２センサとに歪みが発生する。 At this time, the differential pressure signal Dp1 changes from 2 kPa (101 kPa-99 kPa) to 3 kPa (102 kPa-99 kPa). Furthermore, distortion occurs in the first sensor and the second sensor due to a change in the pressure of the high-pressure side pressure guiding tube.
さらに、n番目に生成する静圧信号Sp1を静圧信号Sp1(n)とし、(n−1)番目に生成する静圧信号Sp1を静圧信号Sp1(n−1)とすると、差圧信号Sp1に係るn番目の揺動Fsp1(n)は、例えば、以下の差分の式（４）で定義する。
Fsp1(n)＝Sp1(n)−Sp1(n−1) （４）
Further, if the static pressure signal Sp1 generated at the nth is the static pressure signal Sp1 (n) and the static pressure signal Sp1 generated at the (n−1) th is the static pressure signal Sp1 (n−1), the differential pressure signal The n-th oscillation Fsp1 (n) related to Sp1 is defined by, for example, the following difference equation (4).
Fsp1 (n) = Sp1 (n) −Sp1 (n−1) (4)
また、揺動Fsp1'(n)は、例えば、以下の式（５）で定義する。ただし、(n−2)番目に生成する静圧信号Sp1を静圧信号Sp1(n−2)とする。そして、揺動Fsp1(n)は、揺動Fsp1'(n)と置き換えることが可能である。
Fsp1'(n)＝Sp1(n)−2・Sp1(n−1)＋Sp1(n−2) （５）
Further, the swing Fsp1 ′ (n) is defined by the following equation (5), for example. However, the (n-2) th generated static pressure signal Sp1 is defined as a static pressure signal Sp1 (n-2). Then, the swing Fsp1 (n) can be replaced with the swing Fsp1 ′ (n).
Fsp1 '(n) = Sp1 (n) -2 · Sp1 (n-1) + Sp1 (n-2) (5)
さらに、揺動Fsp1(n)の分散Vasp1は、例えば、以下の式（６）で定義する。ただし、Nは全サンプル数とする。
Vasp1＝Σ{Fsp1(n)・Fsp1(n)}/N （６）
Further, the variance Vasp1 of the oscillation Fsp1 (n) is defined by the following formula (6), for example. N is the total number of samples.
Vasp1 ＝ Σ {Fsp1 (n) ・ Fsp1 (n)} / N (6)
次に、高圧側導圧管の圧力を一定とし、低圧側導圧管の圧力のみが変化する場合を説明する。例えば、高圧側導圧管の圧力は101kPaとし、低圧側導圧管の圧力は99kPaから98kPaに変化する。 Next, the case where the pressure of the high pressure side pressure guiding tube is constant and only the pressure of the low pressure side pressure guiding tube changes will be described. For example, the pressure of the high pressure side impulse line is 101 kPa, and the pressure of the low pressure side impulse line changes from 99 kPa to 98 kPa.
このとき、定数Ap2の値を所定の値とすると静圧信号Sp2が一定となる。また、静圧信号Sp2は、第１センサの出力の２乗と第２センサの出力の２乗と所定の定数Ap2とから生成し、例えば、以下の式（７）で定義する。
Sp2＝Fc2＋Ap2・Fr2 （７）
At this time, if the value of the constant Ap2 is a predetermined value, the static pressure signal Sp2 becomes constant. The static pressure signal Sp2 is generated from the square of the output of the first sensor, the square of the output of the second sensor, and a predetermined constant Ap2, and is defined by the following equation (7), for example.
Sp2 = Fc 2 + Ap2 · Fr 2 (7)
即ち、静圧信号Sp2は、低圧側導圧管の圧力の変化から影響を受けにくい。そして、静圧信号Sp2は、高圧側導圧管の圧力に基づく値となる。即ち、静圧信号Sp2は、高圧側導圧管の圧力の変化及び揺動を示す値となる。 That is, the static pressure signal Sp2 is not easily affected by a change in the pressure of the low pressure side pressure guiding tube. The static pressure signal Sp2 is a value based on the pressure of the high pressure side pressure guiding tube. That is, the static pressure signal Sp2 is a value indicating the change and swing of the pressure of the high pressure side pressure guiding tube.
また、このとき、差圧信号Dp2は、2kPa（101kPa−99kPa）から3kPa（101kPa−98kPa）へ変化する。さらにまた、低圧側導圧管の圧力の変化により、第１センサと第２センサとに歪みが発生する。 At this time, the differential pressure signal Dp2 changes from 2 kPa (101 kPa-99 kPa) to 3 kPa (101 kPa-98 kPa). Furthermore, distortion occurs in the first sensor and the second sensor due to a change in the pressure of the low pressure side pressure guiding tube.
さらに、n番目に生成する静圧信号Sp2を静圧信号Sp2(n)とし、(n−1)番目に生成する静圧信号Sp2を静圧信号Sp2(n−1)とすると、差圧信号Sp2に係るn番目の揺動Fsp2(n)は、例えば、以下の差分の式（８）で定義する。
Fsp2(n)＝Sp2(n)−Sp2(n−1) （８）
Furthermore, if the static pressure signal Sp2 generated at the nth is the static pressure signal Sp2 (n) and the static pressure signal Sp2 generated at the (n−1) th is the static pressure signal Sp2 (n−1), the differential pressure signal The n-th oscillation Fsp2 (n) related to Sp2 is defined by the following difference equation (8), for example.
Fsp2 (n) = Sp2 (n) −Sp2 (n−1) (8)
また、揺動Fsp2'(n)は、例えば、以下の式（９）で定義する。ただし、(n−2)番目に生成する静圧信号Sp2を静圧信号Sp2(n−2)とする。そして、揺動Fsp2(n)は、揺動Fsp2'(n)と置き換えることが可能である。
Fsp2'(n)＝Sp2(n)−2・Sp2(n−1)＋Sp2(n−2) （９）
Further, the swing Fsp2 ′ (n) is defined by the following formula (9), for example. However, the (n−2) th generated static pressure signal Sp2 is defined as a static pressure signal Sp2 (n−2). Then, the swing Fsp2 (n) can be replaced with the swing Fsp2 ′ (n).
Fsp2 ′ (n) = Sp2 (n) −2 ・ Sp2 (n−1) + Sp2 (n−2) (9)
さらに、揺動Fsp2(n)の分散Vasp2は、例えば、以下の式（１０）で定義する。ただし、Nは全サンプル数とする。
Vasp2＝Σ{Fsp2(n)・Fsp2(n)}/N （１０）
Further, the variance Vasp2 of the oscillation Fsp2 (n) is defined by the following equation (10), for example. N is the total number of samples.
Vasp2 ＝ Σ {Fsp2 (n) ・ Fsp2 (n)} / N (10)
そして、演算手段は、周波数Fcと周波数Frとから静圧信号Sp1と静圧信号Sp2とを生成し、分散Vasp1と分散Vasp2とを生成する。 Then, the calculation means generates a static pressure signal Sp1 and a static pressure signal Sp2 from the frequency Fc and the frequency Fr, and generates a variance Vasp1 and a variance Vasp2.
このように構成する本発明の圧力検出器の実用的な設定例を説明する。
定数Ap1は、高圧側導圧管の圧力の変化により差圧信号Dp1が0から0.1MPaまで変化するときに、静圧信号Sp1がほぼ一定となる値にする。また、定数Ap2は、低圧側導圧管の圧力の変化により差圧信号Dp2が0から0.1MPaまで変化するときに、静圧信号Sp2がほぼ一定となる値にする。
A practical setting example of the pressure detector of the present invention configured as described above will be described.
The constant Ap1 is set to a value at which the static pressure signal Sp1 becomes substantially constant when the differential pressure signal Dp1 changes from 0 to 0.1 MPa due to a change in pressure in the high-pressure side impulse line. The constant Ap2 is set to a value at which the static pressure signal Sp2 becomes substantially constant when the differential pressure signal Dp2 changes from 0 to 0.1 MPa due to a change in pressure in the low pressure side pressure guiding tube.
また、高圧側導圧管の圧力の変化による第１センサと第２センサとに歪みと、低圧側導圧管の圧力の変化による第１センサと第２センサとに歪みとは異なる。よって、定数Ap1の値と定数Ap2の値とは異なる。 Further, the distortion is different in the first sensor and the second sensor due to the change in the pressure of the high pressure side impulse line, and the distortion is different in the first sensor and the second sensor due to the change in the pressure of the low pressure side impulse line. Therefore, the value of the constant Ap1 is different from the value of the constant Ap2.
以上のように構成する本発明の圧力検出器の動作について図１を用いて説明する。図１は、本発明の一実施例における診断の判定表である。 The operation of the pressure detector of the present invention configured as described above will be described with reference to FIG. FIG. 1 is a diagnosis determination table according to an embodiment of the present invention.
第１に、正常の場合を説明する。このとき、高圧側導圧管の圧力の揺動は大きく、低圧側導圧管の圧力の揺動は大きい。よって、分散Vasp1は大きくなる。また、分散Vasp2は大きくなる。 First, a normal case will be described. At this time, the fluctuation of the pressure of the high pressure side pressure guiding tube is large, and the fluctuation of the pressure of the low pressure side pressure guiding tube is large. Therefore, the variance Vasp1 becomes large. Moreover, the dispersion Vasp2 becomes large.
第２に、高圧側導圧管のみの詰まりの場合を説明する。このとき、高圧側導圧管の圧力の揺動は小さく、低圧側導圧管の圧力の揺動は大きい。よって、分散Vasp1は、主に低圧側導圧管の圧力の揺動からの影響を受けるため、中程度の値となる。また、分散Vasp2は、詰まりにより、小さくなる。 Secondly, a case where only the high pressure side pressure guiding tube is clogged will be described. At this time, the fluctuation of the pressure of the high pressure side impulse line is small, and the fluctuation of the pressure of the low pressure side impulse line is large. Therefore, the dispersion Vasp1 is an intermediate value because it is mainly affected by the fluctuation of the pressure of the low-pressure side pressure guiding tube. Also, the dispersion Vasp2 becomes smaller due to clogging.
第３に、低圧側導圧管のみの詰まりの場合を説明する。このとき、高圧側導圧管の圧力の揺動は大きく、低圧側導圧管の圧力の揺動は小さい。よって、分散Vasp1は、詰まりにより、小さくなる。また、分散Vasp2は、主に高圧側導圧管の圧力の揺動からの影響を受けるため、中程度の値となる。 Third, the case where only the low pressure side pressure guiding tube is clogged will be described. At this time, the fluctuation of the pressure of the high pressure side impulse line is large, and the fluctuation of the pressure of the low pressure side impulse line is small. Therefore, the dispersion Vasp1 becomes smaller due to clogging. Further, since the dispersion Vasp2 is mainly affected by the fluctuation of the pressure of the high-pressure side pressure guiding tube, it has a medium value.
第４に、高圧側導圧管の詰まり及び低圧導圧管の詰まりの場合、即ち、高圧側導圧管と低圧導圧管とが共に詰まりの場合を説明する。このとき、高圧側導圧管の圧力の揺動は小さく、低圧側導圧管の圧力の揺動は大きい。よって、分散Vasp1は、詰まりにより、小さくなる。また、分散Vasp2は、詰まりにより、小さくなる。 Fourthly, the case where the high pressure side impulse line is clogged and the low pressure impulse line is clogged, that is, the case where both the high pressure side impulse line and the low pressure impulse line are clogged will be described. At this time, the fluctuation of the pressure of the high pressure side impulse line is small, and the fluctuation of the pressure of the low pressure side impulse line is large. Therefore, the dispersion Vasp1 becomes smaller due to clogging. Also, the dispersion Vasp2 becomes smaller due to clogging.
このようにして、演算手段は、分散Vasp1と分散Vasp2とから高圧側導圧管の詰まりと、低圧側導圧管の詰まりとを診断する。 In this way, the computing means diagnoses clogging of the high-pressure side impulse line and clogging of the low-pressure side impulse line from the dispersion Vasp1 and the dispersion Vasp2.
したがって、本発明の圧力検出器は、高圧側導圧管の詰まりの発生と、低圧側導圧管の詰まりの発生とを簡便・正確に診断できる。 Therefore, the pressure detector of the present invention can easily and accurately diagnose the occurrence of clogging of the high-pressure side impulse line and the occurrence of clogging of the low-pressure side impulse line.
さらに、本発明に係る圧力検出器の詰まり診断方法をステップごとに説明する。
まず、低圧側導圧管の圧力を一定とし高圧側導圧管の圧力のみが変化する場合に静圧信号Sp1が一定となる定数Ap1を定める。また、高圧側導圧管の圧力を一定とし低圧側導圧管の圧力のみが変化する場合に静圧信号Sp2が一定となる定数Ap2とを定める。
Further, the pressure detector clogging diagnosis method according to the present invention will be described step by step.
First, a constant Ap1 is determined which makes the static pressure signal Sp1 constant when the pressure of the low pressure side pressure guiding tube is constant and only the pressure of the high pressure side pressure guiding tube changes. In addition, a constant Ap2 is set which makes the static pressure signal Sp2 constant when the pressure of the high pressure side pressure guiding tube is constant and only the pressure of the low pressure side pressure guiding tube changes.
次に、高圧側導圧管の圧力に基づく静圧信号Sp1の揺動Fsp1(n)の分散Vasp1を算出する。また、低圧側導圧管の圧力に基づく静圧信号Sp2の揺動Fsp2(n)の分散Vasp2を算出する。さらに、図１の判定表に基づき、分散Vasp1と分散Vasp2とから、高圧側導圧管の詰まりと、前記低圧側導圧管の詰まりとを診断する。 Next, the variance Vasp1 of the fluctuation Fsp1 (n) of the static pressure signal Sp1 based on the pressure of the high pressure side pressure guiding tube is calculated. Further, the variance Vasp2 of the fluctuation Fsp2 (n) of the static pressure signal Sp2 based on the pressure of the low pressure side pressure guiding tube is calculated. Further, based on the determination table of FIG. 1, the clogging of the high-pressure side impulse line and the clogging of the low-pressure side impulse line are diagnosed from the dispersion Vasp1 and the dispersion Vasp2.
したがって、本発明に係る圧力検出器の詰まり診断方法は、高圧側導圧管の詰まりの発生と、低圧側導圧管の詰まりの発生とを簡便・正確に診断できる。 Therefore, the clogging diagnosis method of the pressure detector according to the present invention can easily and accurately diagnose the occurrence of clogging of the high pressure side pressure guiding tube and the occurrence of clogging of the low pressure side pressure guiding tube.
また、上述の例では、本発明を振動式の圧力検出器に適用する場合を説明したが、これとは別に、本発明をピエゾ抵抗式の圧力検出器に適用することもできる。このようなピエゾ抵抗式の圧力検出器も、振動式の圧力検出器と同様の作用を有し、高圧側導圧管の詰まりの発生と、低圧側導圧管の詰まりの発生とを簡便・正確に診断できる。 In the above-described example, the case where the present invention is applied to a vibration type pressure detector has been described. Alternatively, the present invention can be applied to a piezoresistive pressure detector. Such a piezoresistive pressure detector has the same effect as the vibration pressure detector, and it is easy and accurate to prevent clogging of the high pressure side pressure guiding tube and clogging of the low pressure side pressure guiding tube. Can be diagnosed.
以上のように、本発明は、前述の実施例に限定されることなく、その本質を逸脱しない範囲でさらに多くの変更及び変形を含むものである。 As described above, the present invention is not limited to the above-described embodiments, and includes many changes and modifications without departing from the essence thereof.
Claims (3)
前記ダイアフラムの周辺部分に形成され、前記高圧側導圧管の圧力と前記低圧側導圧管の圧力とに係る第２の周波数（Ｆｒ）を出力し、前記第１センサと一体に形成する振動式の第２センサと、
前記第１の周波数（Ｆｃ）と前記第２の周波数（Ｆｒ）とから差圧信号（Ｄｐ）と静圧信号とを生成する演算手段とを備える圧力検出器において、
前記演算手段は、
前記低圧側導圧管の圧力を一定とし前記高圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（３）の第１の定数（Ａｐ１）を用いて算出される第１の静圧信号（Ｓｐ１）の揺動（Ｆｓｐ１（ｎ），Ｆｓｐ１'（ｎ））の分散（Ｖａｓｐ１）と、
前記高圧側導圧管の圧力を一定とし前記低圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（７）の第２の定数（Ａｐ２）を用いて算出される第２の静圧信号（Ｓｐ２）の揺動（Ｆｓｐ２（ｎ），Ｆｓｐ２'（ｎ））の分散（Ｖａｓｐ２）とから、前記高圧側導圧管の詰まりと、前記低圧側導圧管の詰まりとをそれぞれ診断する
ことを特徴とする圧力検出器。
Ｓｐ１＝Ｆｃ 2 ＋Ａｐ１・Ｆｒ 2 （３）
Ｓｐ２＝Ｆｃ 2 ＋Ａｐ２・Ｆｒ 2 （７） A vibration-type first sensor that is formed in a central portion of the diaphragm and outputs a first frequency (Fc) related to the pressure of the high-pressure side impulse line and the pressure of the low-pressure side impulse line;
A vibration type formed in the peripheral portion of the diaphragm, which outputs a second frequency (Fr) related to the pressure of the high pressure side pressure guiding tube and the pressure of the low pressure side pressure guiding tube, and is formed integrally with the first sensor . A second sensor;
In the pressure detector, comprising a calculation means for generating a differential pressure signal (Dp) and a static pressure signal from the first frequency (Fc) and the second frequency (Fr),
The computing means is
The static pressure signal is calculated using the first constant of the following equation (3) becomes constant (Ap1) in the case of changing only the pressure of the pressure of the low pressure side impulse line is constant the high pressure side impulse line Dispersion (Vasp1) of fluctuation (Fsp1 (n), Fsp1 ′ (n)) of the static pressure signal (Sp1) of 1;
The static pressure signal is calculated using a second constant of the formula (7) becomes constant (Ap2) to vary only the pressure of the low pressure side impulse line and a constant pressure of the high pressure side impulse line 2 of the fluctuation (Vsp2) of the fluctuation (Fsp2 (n), Fsp2 ′ (n)) of the static pressure signal (Sp2) of 2, the clogging of the high-pressure side impulse line and the clogging of the low-pressure side impulse line, respectively. A pressure detector characterized by diagnosing.
Sp1 = Fc 2 + Ap1 · Fr 2 (3)
Sp2 = Fc 2 + Ap2 · Fr 2 (7)
前記第２の静圧信号（Ｓｐ２）は前記第１センサの前記第１の周波数（Ｆｃ）の２乗と前記第２センサの前記第２の周波数（Ｆｒ）の２乗と前記第２の定数（Ａｐ２）とから生成される
ことを特徴とする請求項１記載の圧力検出器。 The first static pressure signal (Sp1) is a square of the first frequency (Fc) of the first sensor, a square of the second frequency (Fr) of the second sensor, and the first constant. (Ap1) and
The second static pressure signal (Sp2) includes the square of the first frequency (Fc) of the first sensor, the square of the second frequency (Fr) of the second sensor, and the second constant. The pressure detector according to claim 1, wherein the pressure detector is generated from (Ap2).
前記ダイアフラムの周辺部分に形成され、前記高圧側導圧管の圧力と前記低圧側導圧管の圧力とに係る第２の周波数（Ｆｒ）を出力し、前記第１センサと一体に形成する振動式の第２センサと、
前記第１の周波数（Ｆｃ）と前記第２の周波数（Ｆｒ）とから差圧信号（Ｄｐ）と静圧信号とを生成する演算手段とを備える圧力検出器の詰まり診断方法において、
前記低圧側導圧管の圧力を一定とし前記高圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（３）の第１の定数（Ａｐ１）と、前記高圧側導圧管の圧力を一定とし前記低圧側導圧管の圧力のみが変化する場合に静圧信号が一定となる下記式（７）の第２の定数（Ａｐ２）とを定めるステップ、
前記第１の定数（Ａｐ１）を用いて算出される第１の静圧信号（Ｓｐ１）の揺動（Ｆｓｐ１（ｎ），Ｆｓｐ１'（ｎ））の分散（Ｖａｓｐ１）と、前記第２の定数（Ａｐ２）を用いて算出される第２の静圧信号（Ｓｐ２）の揺動（Ｆｓｐ２（ｎ），Ｆｓｐ２'（ｎ））の分散（Ｖａｓｐ２）とから、前記高圧側導圧管の詰まりと、前記低圧側導圧管の詰まりとをそれぞれ診断するステップ、とを備える
ことを特徴とする圧力検出器の詰まり診断方法。
Ｓｐ１＝Ｆｃ 2 ＋Ａｐ１・Ｆｒ 2 （３）
Ｓｐ２＝Ｆｃ 2 ＋Ａｐ２・Ｆｒ 2 （７） A vibration-type first sensor that is formed in a central portion of the diaphragm and outputs a first frequency (Fc) related to the pressure of the high-pressure side impulse line and the pressure of the low-pressure side impulse line;
A vibration type formed in the peripheral portion of the diaphragm, which outputs a second frequency (Fr) related to the pressure of the high pressure side pressure guiding tube and the pressure of the low pressure side pressure guiding tube, and is formed integrally with the first sensor . A second sensor;
In the method for diagnosing clogging of a pressure detector, comprising a calculation means for generating a differential pressure signal (Dp) and a static pressure signal from the first frequency (Fc) and the second frequency (Fr),
The low pressure side the following formula static pressure signal is constant when only the pressure of the high pressure side impulse line pressure to a constant pressure guiding tube is changed and (3) the first constants (Ap1), the high pressure side impulse line second step of determining the constant (Ap2) of the formula where static pressure signal is constant when only the pressure of the low pressure side impulse line and a constant pressure is changed in (7),
Dispersion (Vasp1) of fluctuation (Fsp1 (n), Fsp1 ′ (n)) of the first static pressure signal (Sp1) calculated using the first constant (Ap1), and the second constant From the dispersion (Vasp2) of the fluctuation (Fsp2 (n), Fsp2 ′ (n)) of the second static pressure signal (Sp2) calculated using (Ap2), clogging of the high-pressure side impulse line; And a step of diagnosing clogging of the low-pressure side pressure guiding tube, respectively.
Sp1 = Fc 2 + Ap1 · Fr 2 (3)
Sp2 = Fc 2 + Ap2 · Fr 2 (7)
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| JPH07294356A (en) * | 1994-04-27 | 1995-11-10 | Yokogawa Electric Corp | Choking-diagnostic device for pressure leading pipe in pressure measuring device |
| JPH08128911A (en) * | 1994-11-02 | 1996-05-21 | Yokogawa Electric Corp | Differential pressure measuring device |
| JPH0933374A (en) * | 1995-07-14 | 1997-02-07 | Yokogawa Electric Corp | Semiconductor differential pressure measuring device |
| JP2004085289A (en) * | 2002-08-26 | 2004-03-18 | Yokogawa Electric Corp | Vibration type sensor detection circuit |
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| JPH07294356A (en) * | 1994-04-27 | 1995-11-10 | Yokogawa Electric Corp | Choking-diagnostic device for pressure leading pipe in pressure measuring device |
| JPH08128911A (en) * | 1994-11-02 | 1996-05-21 | Yokogawa Electric Corp | Differential pressure measuring device |
| JPH0933374A (en) * | 1995-07-14 | 1997-02-07 | Yokogawa Electric Corp | Semiconductor differential pressure measuring device |
| JP2004085289A (en) * | 2002-08-26 | 2004-03-18 | Yokogawa Electric Corp | Vibration type sensor detection circuit |
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