JP6782098B2 - Fluid identification device - Google Patents

Fluid identification device Download PDF

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JP6782098B2
JP6782098B2 JP2016105945A JP2016105945A JP6782098B2 JP 6782098 B2 JP6782098 B2 JP 6782098B2 JP 2016105945 A JP2016105945 A JP 2016105945A JP 2016105945 A JP2016105945 A JP 2016105945A JP 6782098 B2 JP6782098 B2 JP 6782098B2
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frequency
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frequency characteristic
acquisition unit
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尚弘 吉田
尚弘 吉田
幸則 亀田
幸則 亀田
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KYB Corp
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Description

本発明は、流体識別装置に関する。 The present invention relates to a fluid identification device.

流体の状態を検出する技術が提案されている（例えば、特許文献１参照）。 A technique for detecting the state of a fluid has been proposed (see, for example, Patent Document 1).

特許文献１には、回転部や摺動部に循環供給され、これら各部品の摩耗を防いで円滑に動作させるためのオイルについて、劣化を判断するオイル劣化検出装置が示されている。このオイル劣化検出装置は、オイル流路に互いに並行して設置された２枚の極板を備えており、これら２枚の極板間に交流電圧を印加することによりオイルの導電率および誘電率を求め、導電率および誘電率に基づいてオイルの劣化を判断する。 Patent Document 1 discloses an oil deterioration detecting device for determining deterioration of oil that is circulated and supplied to a rotating portion and a sliding portion to prevent wear of each of these parts and operate smoothly. This oil deterioration detection device includes two plates installed in parallel with each other in the oil flow path, and by applying an AC voltage between these two plates, the conductivity and dielectric constant of the oil. Is determined, and the deterioration of the oil is judged based on the conductivity and the dielectric constant.

特開２００９−２６９３号公報JP-A-2009-2693

誘電率や導電率といった流体の電気的特徴量は、流体の劣化の度合いによっても変化するが、流体の種類、製造メーカ、銘柄などによっても変化する。しかし、特許文献１に示されているオイル劣化検出装置では、流体の種類、製造メーカ、および銘柄と、流体の電気的特徴量と、の関係について考慮されていない。このため、特許文献１に示されているオイル劣化検出装置は、流体を識別することができず、流体の種類、製造メーカ、銘柄が予め分かっていなければ、流体の電気的特徴量を求めても、流体の劣化を適正に判断することはできなかった。 The electrical features of a fluid, such as permittivity and conductivity, vary depending on the degree of deterioration of the fluid, but also on the type, manufacturer, brand, etc. of the fluid. However, in the oil deterioration detection device shown in Patent Document 1, the relationship between the type, manufacturer, and brand of the fluid and the electrical feature amount of the fluid is not considered. Therefore, the oil deterioration detection device shown in Patent Document 1 cannot identify the fluid, and if the type, manufacturer, and brand of the fluid are not known in advance, the electrical feature amount of the fluid is obtained. However, it was not possible to properly judge the deterioration of the fluid.

そこで、本発明は、上述の課題に鑑みてなされたものであり、流体を識別する流体識別装置を提供する。 Therefore, the present invention has been made in view of the above-mentioned problems, and provides a fluid identification device for identifying a fluid.

本発明の１またはそれ以上の実施形態は、流体を識別する流体識別装置であって、前記流体に印加する交流電圧の周波数を制御して、前記流体の電気的特徴量の周波数特性を取得する周波数特性取得部と、前記流体の電気的特徴量の周波数特性を、流体の種類ごとに記憶する記憶部と、前記周波数特性取得部により取得された周波数特性と、前記記憶部に記憶されている周波数特性と、に基づいて、前記周波数特性取得部により周波数特性が取得された流体を識別する識別部と、を備え、前記識別部は、流体の電気的特徴量の周波数特性を表す曲線の傾きと、前記曲線の傾きの変化量の絶対値が閾値以上になった際における前記交流電圧の周波数および前記流体の電気的特徴量と、のうち少なくともいずれかについて、前記周波数特性取得部により取得された周波数特性と、前記記憶部に記憶されている周波数特性と、で比較して、前記流体を識別することを特徴とする。 One or more embodiments of the present invention is a fluid identification device for identifying a fluid, which controls the frequency of an AC voltage applied to the fluid to acquire the frequency characteristics of the electrical features of the fluid. The frequency characteristic acquisition unit, the storage unit that stores the frequency characteristics of the electrical characteristics of the fluid for each type of fluid, the frequency characteristics acquired by the frequency characteristic acquisition unit, and the storage unit are stored. The identification unit includes a frequency characteristic and an identification unit that identifies the fluid whose frequency characteristic has been acquired by the frequency characteristic acquisition unit, and the identification unit has an inclination of a curve representing the frequency characteristic of the electrical feature amount of the fluid. And, at least one of the frequency of the AC voltage and the electrical feature amount of the fluid when the absolute value of the change amount of the slope of the curve becomes equal to or higher than the threshold value is acquired by the frequency characteristic acquisition unit. It is characterized in that the fluid is identified by comparing with the frequency characteristic stored in the storage unit and the frequency characteristic stored in the storage unit.

本発明の１またはそれ以上の実施形態によれば、流体を識別することができる。 According to one or more embodiments of the present invention, fluids can be identified.

本発明の第１実施形態に係る流体識別装置のブロック図である。It is a block diagram of the fluid identification apparatus which concerns on 1st Embodiment of this invention. 本発明の第１実施形態に係る流体識別装置が備える周波数特性取得部の概略構成図である。It is a schematic block diagram of the frequency characteristic acquisition part included in the fluid identification apparatus which concerns on 1st Embodiment of this invention. 潤滑油の誘電率の周波数特性の一例を示すグラフである。It is a graph which shows an example of the frequency characteristic of the dielectric constant of a lubricating oil. 本発明の第１実施形態に係る流体識別装置のフローチャートである。It is a flowchart of the fluid identification apparatus which concerns on 1st Embodiment of this invention. 本発明の第２実施形態に係る流体識別装置のブロック図である。It is a block diagram of the fluid identification apparatus which concerns on 2nd Embodiment of this invention. 潤滑油の導電率の周波数特性の一例を示すグラフである。It is a graph which shows an example of the frequency characteristic of the conductivity of a lubricating oil.

以下、本発明の実施の形態について図面を参照しながら説明する。なお、以下の実施形態における構成要素は適宜、既存の構成要素などとの置き換えが可能であり、また、他の既存の構成要素との組み合わせを含む様々なバリエーションが可能である。このため、以下の実施形態の記載をもって、特許請求の範囲に記載された発明の内容を限定するものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The components in the following embodiments can be replaced with existing components as appropriate, and various variations including combinations with other existing components are possible. Therefore, the description of the following embodiments does not limit the content of the invention described in the claims.

＜第１実施形態＞
図１は、本発明の第１実施形態に係る流体識別装置１のブロック図である。流体識別装置１は、周波数特性取得部１０、記憶部２０、および識別部３０を備えており、機器内の潤滑油を識別する。 <First Embodiment>
FIG. 1 is a block diagram of the fluid identification device 1 according to the first embodiment of the present invention. The fluid identification device 1 includes a frequency characteristic acquisition unit 10, a storage unit 20, and an identification unit 30, and identifies the lubricating oil in the device.

周波数特性取得部１０は、機器内の潤滑油に印加する交流電圧の周波数を制御して、潤滑油の誘電率の周波数特性を取得する。記憶部２０は、潤滑油の誘電率の周波数特性を、潤滑油ごとに記憶する。識別部３０は、周波数特性取得部１０により取得された周波数特性と、記憶部２０に記憶されている周波数特性と、に基づいて、周波数特性取得部１０により周波数特性が取得された潤滑油を識別する。 The frequency characteristic acquisition unit 10 controls the frequency of the AC voltage applied to the lubricating oil in the device to acquire the frequency characteristic of the dielectric constant of the lubricating oil. The storage unit 20 stores the frequency characteristics of the dielectric constant of the lubricating oil for each lubricating oil. The identification unit 30 identifies the lubricating oil whose frequency characteristics have been acquired by the frequency characteristic acquisition unit 10 based on the frequency characteristics acquired by the frequency characteristic acquisition unit 10 and the frequency characteristics stored in the storage unit 20. To do.

図２は、周波数特性取得部１０の概略構成図である。周波数特性取得部１０は、円柱状の基部１１と、基部１１に立設された一対の電極１２、１３と、電源部１４と、取得部１５と、を備える。 FIG. 2 is a schematic configuration diagram of the frequency characteristic acquisition unit 10. The frequency characteristic acquisition unit 10 includes a columnar base portion 11, a pair of electrodes 12 and 13 erected on the base portion 11, a power supply unit 14, and an acquisition unit 15.

電極１２、１３は、平板状の極板であり、互いに並行して配置されている。電源部１４は、潤滑油の中に設置された電極１２、１３の間に交流電圧を印加するとともに、この交流電圧の周波数を予め定められた周波数範囲の中で制御する。予め定められた周波数範囲は、例えば機器内に投入される可能性のある潤滑油の誘電率の周波数特性に応じて適宜設定され、例えば１ｋＨｚから１００ＭＨｚの範囲に設定される。 The electrodes 12 and 13 are flat plate-shaped plates and are arranged in parallel with each other. The power supply unit 14 applies an AC voltage between the electrodes 12 and 13 installed in the lubricating oil, and controls the frequency of the AC voltage within a predetermined frequency range. The predetermined frequency range is appropriately set according to, for example, the frequency characteristic of the dielectric constant of the lubricating oil that may be put into the equipment, and is set, for example, in the range of 1 kHz to 100 MHz.

取得部１５は、電源部１４により周波数が制御されている交流電圧が電極１２、１３に印加されている状態において、電極１２、１３の間の潤滑油の誘電率を求めることにより、潤滑油の誘電率の周波数特性を取得する。 The acquisition unit 15 obtains the dielectric constant of the lubricating oil between the electrodes 12 and 13 in a state where the AC voltage whose frequency is controlled by the power supply unit 14 is applied to the electrodes 12 and 13, so that the lubricating oil can be used. Acquires the frequency characteristics of the permittivity.

なお、取得部１５は、潤滑油の誘電率の周波数特性として、第１の周波数ｆ１と、第１の周波数ｆ１における誘電率ε１と、第２の周波数ｆ２における曲線の傾きΔε２と、の３つのパラメータを取得する。これら３つのパラメータについて、図３を用いて以下に説明する。 The acquisition unit 15 has three frequency characteristics of the dielectric constant of the lubricating oil: the first frequency f1, the dielectric constant ε1 at the first frequency f1, and the slope Δε2 of the curve at the second frequency f2. Get the parameters. These three parameters will be described below with reference to FIG.

図３は、潤滑油の誘電率の周波数特性の一例を示すグラフである。潤滑油の誘電率の周波数特性は、潤滑油の種類（具体的には、品名、品番、グレードなど）、製造メーカ、銘柄などに応じて異なる。特に、第１の周波数ｆ１と、第１の周波数ｆ１における誘電率ε１と、第２の周波数ｆ２における曲線の傾きΔε２と、の３つのパラメータの値は、潤滑油の種類、製造メーカ、銘柄などに応じて大きく異なる。そこで、本実施形態では、第１の周波数ｆ１と、第１の周波数ｆ１における誘電率ε１と、第２の周波数ｆ２における曲線の傾きΔε２と、の３つのパラメータについて、周波数特性取得部１０により取得された周波数特性と、記憶部２０に記憶されている周波数特性と、で比較して、周波数特性取得部１０により周波数特性が取得された潤滑油を識別する。 FIG. 3 is a graph showing an example of the frequency characteristics of the dielectric constant of the lubricating oil. The frequency characteristics of the dielectric constant of the lubricating oil differ depending on the type of lubricating oil (specifically, product name, product number, grade, etc.), manufacturer, brand, and the like. In particular, the values of the three parameters of the first frequency f1, the dielectric constant ε1 at the first frequency f1, and the slope Δε2 of the curve at the second frequency f2 are the types of lubricating oil, the manufacturer, the brand, and the like. It varies greatly depending on. Therefore, in the present embodiment, the frequency characteristic acquisition unit 10 acquires the three parameters of the first frequency f1, the dielectric constant ε1 at the first frequency f1, and the slope Δε2 of the curve at the second frequency f2. The frequency characteristic obtained is compared with the frequency characteristic stored in the storage unit 20, and the lubricating oil whose frequency characteristic has been acquired by the frequency characteristic acquisition unit 10 is identified.

まず、第１の周波数ｆ１について、以下に説明する。
電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていくと、潤滑油の誘電率の周波数特性を表す曲線の傾きが次第に小さくなっていく。第１の周波数ｆ１とは、潤滑油の誘電率の周波数特性を表す曲線の傾きが閾値未満になった際における交流電圧の周波数のことである。 First, the first frequency f1 will be described below.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the lower limit frequency fmin, the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil gradually becomes smaller. The first frequency f1 is the frequency of the AC voltage when the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil becomes less than the threshold value.

次に、第１の周波数ｆ１における誘電率ε１について、以下に説明する。
第１の周波数ｆ１における誘電率ε１とは、第１の周波数ｆ１における潤滑油の誘電率のことである。 Next, the dielectric constant ε1 at the first frequency f1 will be described below.
The dielectric constant ε1 at the first frequency f1 is the dielectric constant of the lubricating oil at the first frequency f1.

次に、第２の周波数ｆ２における曲線の傾きΔε２について、以下に説明する。
電極１２、１３の間に印加する交流電圧の周波数を第１の周波数ｆ１からさらに上昇させていくと、潤滑油の誘電率の周波数特性を表す曲線が変曲点を迎える。潤滑油の誘電率の周波数特性を表す曲線の変曲点における、電極１２、１３の間に印加する交流電圧の周波数を第２の周波数ｆ２とすると、第２の周波数ｆ２における曲線の傾きΔε２とは、潤滑油の誘電率の周波数特性を表す曲線の第２の周波数ｆ２における傾きのことである。 Next, the slope Δε2 of the curve at the second frequency f2 will be described below.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is further increased from the first frequency f1, the curve representing the frequency characteristic of the dielectric constant of the lubricating oil reaches an inflection point. Assuming that the frequency of the AC voltage applied between the electrodes 12 and 13 at the turning point of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil is the second frequency f2, the slope of the curve Δε2 at the second frequency f2 Is the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil at the second frequency f2.

なお、記憶部２０は、潤滑油の誘電率の周波数特性を、機器内に投入される可能性のある潤滑油ごとに予め記憶している。また、詳細については図４を用いて後述するが、記憶部２０は、周波数特性取得部１０により取得された周波数特性と、予め記憶された周波数特性と、の類似度が所定値未満である場合、すなわち周波数特性取得部１０により取得された周波数特性と類似または同一の周波数特性を記憶していない場合に、周波数特性取得部１０により取得された周波数特性を、ユーザから入力を受け付けた機器内の潤滑油についての情報と関連づけて新たに記憶する。 The storage unit 20 stores in advance the frequency characteristics of the dielectric constant of the lubricating oil for each lubricating oil that may be charged into the device. Further, the details will be described later with reference to FIG. 4, but in the storage unit 20, when the similarity between the frequency characteristics acquired by the frequency characteristic acquisition unit 10 and the frequency characteristics stored in advance is less than a predetermined value. That is, when the frequency characteristic similar to or the same as the frequency characteristic acquired by the frequency characteristic acquisition unit 10 is not stored, the frequency characteristic acquired by the frequency characteristic acquisition unit 10 is input from the user in the device. Newly memorize in association with information about lubricating oil.

以上の周波数特性取得部１０、記憶部２０、および識別部３０は、ＣＰＵ、メモリ（ＲＡＭ）、ハードディスクなどを用いて実現される。 The frequency characteristic acquisition unit 10, the storage unit 20, and the identification unit 30 are realized by using a CPU, a memory (RAM), a hard disk, and the like.

ハードディスクは、オペレーティングシステムや、潤滑油を識別するための一連の処理を実行するためのプログラムなどを記憶する。なお、ハードディスクは、非一時的な記録媒体であればよく、例えば、ＥＰＲＯＭやフラッシュメモリといった不揮発性のメモリ、ＣＤ−ＲＯＭなどであってもよい。 The hard disk stores an operating system, a program for executing a series of processes for identifying a lubricating oil, and the like. The hard disk may be a non-temporary recording medium, and may be, for example, a non-volatile memory such as an EPROM or a flash memory, or a CD-ROM.

ＣＰＵは、メモリを適宜利用して、ハードディスクに記憶されているデータやプログラムを適宜読み出して、演算や実行を適宜行う。 The CPU appropriately uses the memory to appropriately read the data and programs stored in the hard disk, and appropriately performs calculations and executions.

図４は、流体識別装置１のフローチャートである。
ステップＳ１において、流体識別装置１は、周波数特性取得部１０により、機器内の潤滑油に印加する交流電圧の周波数を制御して、潤滑油の誘電率の周波数特性を取得し、ステップＳ２に処理を移す。
なお、潤滑油が機器に投入されてから時間が経過するに従って、潤滑油の酸化や異物混入などにより潤滑油の状態が変化し、潤滑油の誘電率も変化する。このため、流体識別装置１は、潤滑油が機器に投入されてから予め定められた時間が経過するまでの期間に、ステップＳ１の処理を行う。 FIG. 4 is a flowchart of the fluid identification device 1.
In step S1, the fluid identification device 1 controls the frequency of the AC voltage applied to the lubricating oil in the device by the frequency characteristic acquisition unit 10, acquires the frequency characteristic of the dielectric constant of the lubricating oil, and processes it in step S2. To transfer.
As time passes after the lubricating oil is put into the equipment, the state of the lubricating oil changes due to oxidation of the lubricating oil or contamination of foreign matter, and the dielectric constant of the lubricating oil also changes. Therefore, the fluid identification device 1 performs the process of step S1 during the period from when the lubricating oil is charged into the device until a predetermined time elapses.

ステップＳ２において、流体識別装置１は、識別部３０により、ステップＳ１において取得した周波数特性と、記憶部２０に記憶されている周波数特性のそれぞれと、の類似度を算出し、ステップＳ３に処理を移す。 In step S2, the fluid identification device 1 calculates the similarity between the frequency characteristics acquired in step S1 and the frequency characteristics stored in the storage unit 20 by the identification unit 30, and processes in step S3. Move.

ステップＳ２における類似度の算出について、以下に詳述する。
例えば、ステップＳ１において取得した周波数特性と、記憶部２０に記憶されている潤滑油Ａの周波数特性と、の類似度を算出する場合を説明する。この場合、まず、ステップＳ１において取得した上述の３つのパラメータの値のそれぞれと、記憶部２０に記憶されている潤滑油Ａについての上述の３つのパラメータの値のそれぞれと、の類似度を求める。次に、求めた３つの類似度の平均値を、ステップＳ１において取得した周波数特性と、記憶部２０に記憶されている潤滑油Ａの周波数特性と、の類似度として算出する。 The calculation of the degree of similarity in step S2 will be described in detail below.
For example, a case of calculating the similarity between the frequency characteristic acquired in step S1 and the frequency characteristic of the lubricating oil A stored in the storage unit 20 will be described. In this case, first, the similarity between each of the above-mentioned three parameter values acquired in step S1 and each of the above-mentioned three parameter values for the lubricating oil A stored in the storage unit 20 is obtained. .. Next, the average value of the obtained three similarities is calculated as the similarity between the frequency characteristic acquired in step S1 and the frequency characteristic of the lubricating oil A stored in the storage unit 20.

ステップＳ３において、流体識別装置１は、識別部３０により、ステップＳ２において算出した類似度のうち最も高いものが、所定値未満であるか否かを判別する。流体識別装置１は、識別部３０により、所定値未満であると判別した場合、すなわちステップＳ１において取得した周波数特性と類似または同一の周波数特性が記憶部２０に記憶されていない場合には、ステップＳ４に処理を移す。一方、所定値以上であると判別した場合、すなわちステップＳ１において取得した周波数特性と類似または同一の周波数特性が記憶部２０に記憶されている場合には、ステップＳ５に処理を移す。 In step S3, the fluid identification device 1 determines whether or not the highest degree of similarity calculated in step S2 is less than a predetermined value by the identification unit 30. When the fluid identification device 1 determines that the value is less than a predetermined value by the identification unit 30, that is, when the frequency characteristic similar to or the same as the frequency characteristic acquired in step S1 is not stored in the storage unit 20, the step The process is transferred to S4. On the other hand, when it is determined that the value is equal to or higher than the predetermined value, that is, when the frequency characteristic similar to or the same as the frequency characteristic acquired in step S1 is stored in the storage unit 20, the process is transferred to step S5.

ステップＳ４において、流体識別装置１は、識別部３０により、ステップＳ１において取得した周波数特性を記憶部２０に記憶させ、図４に示す処理を終了する。
なお、ステップＳ４の処理後に、流体識別装置１は、機器内の潤滑油の種類、製造メーカ、および銘柄の入力をユーザから受け付けて、ステップＳ４において記憶部２０に記憶させた周波数特性に、潤滑油の種類、製造メーカ、および銘柄を関連づける。 In step S4, the fluid identification device 1 stores the frequency characteristics acquired in step S1 in the storage unit 20 by the identification unit 30, and ends the process shown in FIG.
After the process of step S4, the fluid identification device 1 receives the input of the type, manufacturer, and brand of the lubricating oil in the device from the user, and lubricates the frequency characteristics stored in the storage unit 20 in step S4. Associate oil types, manufacturers, and brands.

ステップＳ５において、流体識別装置１は、識別部３０により、記憶部２０に記憶されている周波数特性のうち、ステップＳ２において最も高い類似度を算出した際の周波数特性を有する潤滑油を、機器内の潤滑油として識別し、図４に示す処理を終了する。 In step S5, the fluid identification device 1 supplies the lubricating oil having the frequency characteristic when the highest similarity is calculated in step S2 among the frequency characteristics stored in the storage unit 20 by the identification unit 30. Is identified as the lubricating oil of, and the process shown in FIG. 4 is completed.

以上のように、流体識別装置１は、周波数特性取得部１０により、潤滑油の誘電率の周波数特性を取得し、識別部３０により、周波数特性取得部１０により取得された周波数特性と、記憶部２０により記憶されている潤滑油ごとの周波数特性と、に基づいて潤滑油を識別する。このため、潤滑油の誘電率の周波数特性を用いて、機器内の潤滑油を識別することができる。 As described above, in the fluid identification device 1, the frequency characteristic acquisition unit 10 acquires the frequency characteristic of the dielectric constant of the lubricating oil, and the identification unit 30 acquires the frequency characteristic acquired by the frequency characteristic acquisition unit 10 and the storage unit. The lubricating oil is identified based on the frequency characteristics of each lubricating oil stored by 20 and. Therefore, the lubricating oil in the equipment can be identified by using the frequency characteristic of the dielectric constant of the lubricating oil.

また、流体識別装置１は、潤滑油の誘電率の周波数特性として、第１の周波数ｆ１と、第１の周波数ｆ１における誘電率ε１と、第２の周波数ｆ２における曲線の傾きΔε２と、の３つのパラメータを用いる。このため、潤滑油の種類、製造メーカ、および銘柄に応じて大きく異なるパラメータを用いて潤滑油を識別することができるので、機器内の潤滑油を適切に識別することができる。 Further, the fluid identification device 1 has three frequency characteristics of the dielectric constant of the lubricating oil, that is, the first frequency f1, the dielectric constant ε1 at the first frequency f1, and the slope Δε2 of the curve at the second frequency f2. Use one parameter. Therefore, since the lubricating oil can be identified using parameters that differ greatly depending on the type, manufacturer, and brand of the lubricating oil, the lubricating oil in the equipment can be appropriately identified.

また、流体識別装置１は、識別部３０により、周波数特性取得部１０により取得した周波数特性と、記憶部２０に記憶されている周波数特性のそれぞれと、の類似度を算出し、最も高い類似度が所定値未満であれば、周波数特性取得部１０により取得した周波数特性を記憶部２０に記憶させる。このため、周波数特性取得部１０により取得した周波数特性と類似または同一の周波数特性が記憶部２０に記憶されていない場合には、この周波数特性が新たに記憶部２０に記憶されることになる。したがって、記憶部２０に周波数特性を新たに記憶させた潤滑油について、種類、製造メーカ、および銘柄の入力を受け付け、入力を受け付けた情報を、記憶部２０に新たに記憶させた周波数特性に関連づけることで、流体識別装置１が識別することのできる潤滑油を増やしていくことができる。 Further, the fluid identification device 1 calculates the similarity between the frequency characteristic acquired by the frequency characteristic acquisition unit 10 and the frequency characteristic stored in the storage unit 20 by the identification unit 30, and has the highest similarity. If is less than a predetermined value, the storage unit 20 stores the frequency characteristics acquired by the frequency characteristic acquisition unit 10. Therefore, when the frequency characteristic similar to or the same as the frequency characteristic acquired by the frequency characteristic acquisition unit 10 is not stored in the storage unit 20, this frequency characteristic is newly stored in the storage unit 20. Therefore, for the lubricating oil whose frequency characteristics are newly stored in the storage unit 20, the input of the type, manufacturer, and brand is accepted, and the received information is associated with the frequency characteristics newly stored in the storage unit 20. As a result, the amount of lubricating oil that can be identified by the fluid identification device 1 can be increased.

また、潤滑油が機器に投入されてから時間が経過するに従って、潤滑油の酸化や異物混入などにより潤滑油の状態が変化し、潤滑油の誘電率も変化する。
そこで、流体識別装置１は、潤滑油が機器に投入されてから予め定められた時間が経過するまでの期間に、周波数特性取得部１０により潤滑油の誘電率の周波数特性を取得する。このため、取得する潤滑油の誘電率の周波数特性に対する、時間経過に伴う影響を抑えることができ、機器内の潤滑油を適切に識別することができる。 Further, as time elapses after the lubricating oil is put into the equipment, the state of the lubricating oil changes due to oxidation of the lubricating oil or contamination of foreign matter, and the dielectric constant of the lubricating oil also changes.
Therefore, the fluid identification device 1 acquires the frequency characteristic of the dielectric constant of the lubricating oil by the frequency characteristic acquisition unit 10 during the period from when the lubricating oil is charged into the apparatus until a predetermined time elapses. Therefore, it is possible to suppress the influence of the acquired lubricating oil on the frequency characteristic of the dielectric constant with the passage of time, and it is possible to appropriately identify the lubricating oil in the equipment.

なお、本実施形態では、潤滑油の誘電率の周波数特性として、第１の周波数ｆ１と、第１の周波数ｆ１における誘電率ε１と、第２の周波数ｆ２における曲線の傾きΔε２と、の３つのパラメータを用いた。しかし、これに限らず、これら３つのパラメータのうち少なくとも１つを用いればよい。 In the present embodiment, there are three frequency characteristics of the dielectric constant of the lubricating oil: the first frequency f1, the dielectric constant ε1 at the first frequency f1, and the slope Δε2 of the curve at the second frequency f2. Parameters were used. However, the present invention is not limited to this, and at least one of these three parameters may be used.

また、本実施形態では、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させて、上述の３つのパラメータを求めた。しかし、これに限らず、電極１２、１３の間に印加する交流電圧の周波数を上限周波数ｆｍａｘから低下させて、上述の３つのパラメータを求めてもよい。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the lower limit frequency fmin to obtain the above-mentioned three parameters. However, the present invention is not limited to this, and the frequency of the AC voltage applied between the electrodes 12 and 13 may be lowered from the upper limit frequency fmax to obtain the above-mentioned three parameters.

また、本実施形態では、電極１２、１３の間に印加する交流電圧の周波数を第１の周波数ｆ１から上昇させて、潤滑油の誘電率の周波数特性を表す曲線の変曲点における交流電圧の周波数を第２の周波数ｆ２とし、第２の周波数ｆ２における曲線の傾きΔε２を、上述の３つのパラメータのうちの１つとして用いた。しかし、これに限らず、図３において第５の周波数ｆ５を求め、第１の周波数ｆ１から第５の周波数ｆ５の間における上述の曲線の傾きを、第２の周波数ｆ２における曲線の傾きΔε２の代わりに用いてもよい。
なお、電極１２、１３の間に印加する交流電圧の周波数を第１の周波数ｆ１から上昇させていくと、潤滑油の誘電率の周波数特性を表す曲線が変曲点を迎えた後に、この曲線の傾きが次第に大きくなっていく。第５の周波数ｆ５とは、潤滑油の誘電率の周波数特性を表す曲線の傾きが閾値以上になった際における交流電圧の周波数のことである。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the first frequency f1, and the AC voltage at the turning point of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil is increased. The frequency was set to the second frequency f2, and the slope Δε2 of the curve at the second frequency f2 was used as one of the above three parameters. However, not limited to this, the fifth frequency f5 is obtained in FIG. 3, and the slope of the above-mentioned curve between the first frequency f1 and the fifth frequency f5 is set to the slope Δε2 of the curve at the second frequency f2. It may be used instead.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the first frequency f1, the curve representing the frequency characteristic of the dielectric constant of the lubricating oil reaches an inflection point, and then this curve is reached. The inclination of is gradually increasing. The fifth frequency f5 is the frequency of the AC voltage when the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil becomes equal to or greater than the threshold value.

また、本実施形態では、第１の周波数ｆ１を、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていき、潤滑油の誘電率の周波数特性を表す曲線の傾きが閾値未満になった際における交流電圧の周波数とした。しかし、これに限らず、第１の周波数ｆ１を、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていき、下限周波数ｆｍｉｎにおける誘電率に対して誘電率が所定の割合だけ減少した際における交流電圧の周波数としてもよい。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 of the first frequency f1 is increased from the lower limit frequency fmin, and the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil is increased. Was the frequency of the AC voltage when was less than the threshold. However, not limited to this, the frequency of the AC voltage applied between the electrodes 12 and 13 of the first frequency f1 is increased from the lower limit frequency fmin, and the dielectric constant is determined with respect to the dielectric constant at the lower limit frequency fmin. It may be the frequency of the AC voltage when it is reduced by the ratio of.

また、本実施形態では、機器内の潤滑油を識別したが、これに限らず、流体であれば識別することができる。 Further, in the present embodiment, the lubricating oil in the device is identified, but the present invention is not limited to this, and any fluid can be identified.

また、本実施形態では、平板状の極板で電極１２、１３を形成し、これら電極１２、１３を互いに並行して配置した。しかし、これに限らず、例えば円柱状や楕円柱状の極板で電極１２、１３を形成してもよい。また、例えば同軸円筒型コンデンサーのように、内径が異なる２つの円筒状の極板で電極１２、１３を形成し、それぞれの中心軸が一致した状態で電極１２、１３のいずれか一方をいずれか他方の内部に配置してもよい。 Further, in the present embodiment, the electrodes 12 and 13 are formed from a flat plate, and the electrodes 12 and 13 are arranged in parallel with each other. However, the present invention is not limited to this, and the electrodes 12 and 13 may be formed from, for example, a cylindrical or elliptical columnar electrode plate. Further, electrodes 12 and 13 are formed of two cylindrical plates having different inner diameters, such as a coaxial cylindrical capacitor, and one of the electrodes 12 and 13 is used in a state where the central axes of the electrodes are aligned. It may be placed inside the other.

また、本実施形態では、潤滑油の誘電率の周波数特性を用いた。しかし、これに限らず、潤滑油の導電率の周波数特性も用いたり、誘電率でも導電率でもない潤滑油の電気的特徴量を用いたり、この電気的特徴量も用いたりしてもよい。 Further, in the present embodiment, the frequency characteristic of the dielectric constant of the lubricating oil is used. However, the present invention is not limited to this, and the frequency characteristic of the conductivity of the lubricating oil may be used, the electrical feature amount of the lubricating oil which is neither the dielectric constant nor the conductivity may be used, or this electrical feature amount may also be used.

＜第２実施形態＞
図５は、本発明の第２実施形態に係る流体識別装置１Ａのブロック図である。図１に示した本発明の第１実施形態に係る流体識別装置１は、潤滑油の誘電率の周波数特性を用いて機器内の潤滑油を識別するのに対して、本実施形態に係る流体識別装置１Ａは、潤滑油の導電率の周波数特性を用いて機器内の潤滑油を識別する。流体識別装置１Ａは、周波数特性取得部１０Ａ、記憶部２０Ａ、および識別部３０Ａを備える。なお、第１実施形態と同様の形態をしている部分については、同一の符号を付して、その説明を省略する。 <Second Embodiment>
FIG. 5 is a block diagram of the fluid identification device 1A according to the second embodiment of the present invention. The fluid identification device 1 according to the first embodiment of the present invention shown in FIG. 1 identifies the lubricating oil in the apparatus by using the frequency characteristic of the dielectric constant of the lubricating oil, whereas the fluid according to the present embodiment. The identification device 1A identifies the lubricating oil in the device by using the frequency characteristic of the conductivity of the lubricating oil. The fluid identification device 1A includes a frequency characteristic acquisition unit 10A, a storage unit 20A, and an identification unit 30A. The parts having the same shape as that of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

周波数特性取得部１０Ａは、機器内の潤滑油に印加する交流電圧の周波数を制御して、潤滑油の導電率の周波数特性を取得する。記憶部２０Ａは、潤滑油の導電率の周波数特性を、潤滑油ごとに記憶する。識別部３０Ａは、周波数特性取得部１０Ａにより取得された周波数特性と、記憶部２０Ａに記憶されている周波数特性と、に基づいて、周波数特性取得部１０Ａにより周波数特性が取得された潤滑油を識別する。 The frequency characteristic acquisition unit 10A controls the frequency of the AC voltage applied to the lubricating oil in the device to acquire the frequency characteristic of the conductivity of the lubricating oil. The storage unit 20A stores the frequency characteristics of the conductivity of the lubricating oil for each lubricating oil. The identification unit 30A identifies the lubricating oil whose frequency characteristics have been acquired by the frequency characteristic acquisition unit 10A based on the frequency characteristics acquired by the frequency characteristic acquisition unit 10A and the frequency characteristics stored in the storage unit 20A. To do.

周波数特性取得部１０Ａは、図２に示した本発明の第１実施形態に係る周波数特性取得部１０とは、取得部１５の代わりに取得部１５Ａを備える点で、異なる。取得部１５Ａは、潤滑油の導電率の周波数特性として、第３の周波数ｆ３と、第３の周波数ｆ３における導電率σ３と、第４の周波数ｆ４における曲線の傾きΔσ４と、の３つのパラメータを取得する。これら３つのパラメータについて、図６を用いて以下に説明する。 The frequency characteristic acquisition unit 10A is different from the frequency characteristic acquisition unit 10 according to the first embodiment of the present invention shown in FIG. 2 in that the acquisition unit 15A is provided instead of the acquisition unit 15. The acquisition unit 15A sets three parameters as the frequency characteristics of the conductivity of the lubricating oil: the third frequency f3, the conductivity σ3 at the third frequency f3, and the slope Δσ4 of the curve at the fourth frequency f4. get. These three parameters will be described below with reference to FIG.

図６は、潤滑油の導電率の周波数特性の一例を示すグラフである。潤滑油の導電率の周波数特性は、潤滑油の種類、製造メーカ、銘柄などに応じて異なる。特に、第３の周波数ｆ３と、第３の周波数ｆ３における導電率σ３と、第４の周波数ｆ４における曲線の傾きΔσ４と、の３つのパラメータの値は、潤滑油の種類、製造メーカ、銘柄などに応じて大きく異なる。そこで、本実施形態では、第３の周波数ｆ３と、第３の周波数ｆ３における導電率σ３と、第４の周波数ｆ４における曲線の傾きΔσ４と、の３つのパラメータについて、周波数特性取得部１０Ａにより取得された周波数特性と、記憶部２０Ａに記憶されている周波数特性と、で比較して、周波数特性取得部１０Ａにより周波数特性が取得された潤滑油を識別する。 FIG. 6 is a graph showing an example of the frequency characteristics of the conductivity of the lubricating oil. The frequency characteristics of the conductivity of the lubricating oil differ depending on the type, manufacturer, brand, etc. of the lubricating oil. In particular, the values of the three parameters of the third frequency f3, the conductivity σ3 at the third frequency f3, and the slope Δσ4 of the curve at the fourth frequency f4 are the type of lubricating oil, the manufacturer, the brand, and the like. It varies greatly depending on. Therefore, in the present embodiment, the frequency characteristic acquisition unit 10A acquires the three parameters of the third frequency f3, the conductivity σ3 at the third frequency f3, and the slope Δσ4 of the curve at the fourth frequency f4. The frequency characteristic obtained is compared with the frequency characteristic stored in the storage unit 20A to identify the lubricating oil whose frequency characteristic has been acquired by the frequency characteristic acquisition unit 10A.

まず、第３の周波数ｆ３について、以下に説明する。
電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていくと、潤滑油の導電率の周波数特性を表す曲線の傾きが次第に大きくなっていく。第３の周波数ｆ３とは、潤滑油の導電率の周波数特性を表す曲線の傾きが閾値以上になった際における交流電圧の周波数のことである。 First, the third frequency f3 will be described below.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the lower limit frequency fmin, the slope of the curve representing the frequency characteristic of the conductivity of the lubricating oil gradually increases. The third frequency f3 is the frequency of the AC voltage when the slope of the curve representing the frequency characteristic of the conductivity of the lubricating oil becomes equal to or higher than the threshold value.

次に、第３の周波数ｆ３における導電率σ３について、以下に説明する。
第３の周波数ｆ３における導電率σ３とは、第３の周波数ｆ３における潤滑油の導電率のことである。 Next, the conductivity σ3 at the third frequency f3 will be described below.
The conductivity σ3 at the third frequency f3 is the conductivity of the lubricating oil at the third frequency f3.

次に、第４の周波数ｆ４における曲線の傾きΔσ４について、以下に説明する。
電極１２、１３の間に印加する交流電圧の周波数を第３の周波数ｆ３からさらに上昇させていくと、潤滑油の導電率の周波数特性を表す曲線が変曲点を迎える。潤滑油の導電率の周波数特性を表す曲線の変曲点における、電極１２、１３の間に印加する交流電圧の周波数を第４の周波数ｆ４とすると、第４の周波数ｆ４における曲線の傾きΔσ４とは、潤滑油の導電率の周波数特性を表す曲線の第４の周波数ｆ４における傾きのことである。 Next, the slope Δσ4 of the curve at the fourth frequency f4 will be described below.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is further increased from the third frequency f3, the curve representing the frequency characteristic of the conductivity of the lubricating oil reaches an inflection point. Assuming that the frequency of the AC voltage applied between the electrodes 12 and 13 at the turning point of the curve representing the frequency characteristic of the conductivity of the lubricating oil is the fourth frequency f4, the slope of the curve Δσ4 at the fourth frequency f4 Is the slope at the fourth frequency f4 of the curve representing the frequency characteristic of the conductivity of the lubricating oil.

以上の周波数特性取得部１０Ａ、記憶部２０Ａ、および識別部３０Ａは、周波数特性取得部１０、記憶部２０、および識別部３０と同様に、ＣＰＵ、メモリ（ＲＡＭ）、ハードディスクなどを用いて実現される。 The frequency characteristic acquisition unit 10A, the storage unit 20A, and the identification unit 30A are realized by using a CPU, a memory (RAM), a hard disk, or the like, similarly to the frequency characteristic acquisition unit 10, the storage unit 20, and the identification unit 30. To.

以上の流体識別装置１Ａは、本発明の第１実施形態に係る流体識別装置１と同様の効果を奏することができる。 The above fluid identification device 1A can exert the same effect as the fluid identification device 1 according to the first embodiment of the present invention.

なお、本実施形態では、潤滑油の導電率の周波数特性として、第３の周波数ｆ３と、第３の周波数ｆ３における導電率σ３と、第４の周波数ｆ４における曲線の傾きΔσ４と、の３つのパラメータを用いた。しかし、これに限らず、これら３つのパラメータのうち少なくとも１つを用いればよい。 In the present embodiment, there are three frequency characteristics of the conductivity of the lubricating oil: the third frequency f3, the conductivity σ3 at the third frequency f3, and the slope Δσ4 of the curve at the fourth frequency f4. Parameters were used. However, the present invention is not limited to this, and at least one of these three parameters may be used.

また、本実施形態では、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させて、上述の３つのパラメータを求めた。しかし、これに限らず、電極１２、１３の間に印加する交流電圧の周波数を上限周波数ｆｍａｘから低下させて、上述の３つのパラメータを求めてもよい。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the lower limit frequency fmin to obtain the above-mentioned three parameters. However, the present invention is not limited to this, and the frequency of the AC voltage applied between the electrodes 12 and 13 may be lowered from the upper limit frequency fmax to obtain the above-mentioned three parameters.

また、本実施形態では、電極１２、１３の間に印加する交流電圧の周波数を第３の周波数ｆ３から上昇させて、潤滑油の導電率の周波数特性を表す曲線の変曲点における交流電圧の周波数を第４の周波数ｆ４とし、第４の周波数ｆ４における曲線の傾きΔσ４を、上述の３つのパラメータのうちの１つとして用いた。しかし、これに限らず、図６において第６の周波数ｆ６を求め、第３の周波数ｆ３から第６の周波数ｆ６の間における上述の曲線の傾きを、第４の周波数ｆ４における曲線の傾きΔσ４の代わりに用いてもよい。
なお、電極１２、１３の間に印加する交流電圧の周波数を第３の周波数ｆ３から上昇させていくと、潤滑油の導電率の周波数特性を表す曲線が変曲点を迎えた後に、この曲線の傾きが次第に小さくなっていく。第６の周波数ｆ６とは、潤滑油の導電率の周波数特性を表す曲線の傾きが閾値未満になった際における交流電圧の周波数のことである。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the third frequency f3, and the AC voltage at the turning point of the curve representing the frequency characteristic of the conductivity of the lubricating oil is increased. The frequency was set to the fourth frequency f4, and the slope Δσ4 of the curve at the fourth frequency f4 was used as one of the above three parameters. However, not limited to this, the sixth frequency f6 is obtained in FIG. 6, and the slope of the above-mentioned curve between the third frequency f3 and the sixth frequency f6 is set to the slope Δσ4 of the curve at the fourth frequency f4. It may be used instead.
When the frequency of the AC voltage applied between the electrodes 12 and 13 is increased from the third frequency f3, the curve representing the frequency characteristic of the conductivity of the lubricating oil reaches the inflection point, and then this curve. The inclination of is gradually reduced. The sixth frequency f6 is the frequency of the AC voltage when the slope of the curve representing the frequency characteristic of the conductivity of the lubricating oil becomes less than the threshold value.

また、本実施形態では、第３の周波数ｆ３を、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていき、潤滑油の導電率の周波数特性を表す曲線の傾きが閾値以上になった際における交流電圧の周波数とした。しかし、これに限らず、第３の周波数ｆ３を、電極１２、１３の間に印加する交流電圧の周波数を下限周波数ｆｍｉｎから上昇させていき、下限周波数ｆｍｉｎにおける導電率に対して導電率が所定の割合だけ増加した際における交流電圧の周波数としてもよい。 Further, in the present embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 of the third frequency f3 is increased from the lower limit frequency fmin, and the slope of the curve representing the frequency characteristic of the conductivity of the lubricating oil is increased. Was used as the frequency of the AC voltage when was equal to or higher than the threshold value. However, not limited to this, the frequency of the AC voltage applied between the electrodes 12 and 13 of the third frequency f3 is increased from the lower limit frequency fmin, and the conductivity is determined with respect to the conductivity at the lower limit frequency fmin. It may be the frequency of the AC voltage when it is increased by the ratio of.

また、本実施形態では、機器内の潤滑油を識別したが、これに限らず、流体であれば識別することができる。 Further, in the present embodiment, the lubricating oil in the device is identified, but the present invention is not limited to this, and any fluid can be identified.

また、本実施形態では、平板状の極板で電極１２、１３を形成し、これら電極１２、１３を互いに並行して配置した。しかし、これに限らず、例えば円柱状や楕円柱状の極板で電極１２、１３を形成してもよい。また、例えば同軸円筒型コンデンサーのように、内径が異なる２つの円筒状の極板で電極１２、１３を形成し、それぞれの中心軸が一致した状態で電極１２、１３のいずれか一方をいずれか他方の内部に配置してもよい。 Further, in the present embodiment, the electrodes 12 and 13 are formed from a flat plate, and the electrodes 12 and 13 are arranged in parallel with each other. However, the present invention is not limited to this, and the electrodes 12 and 13 may be formed from, for example, a cylindrical or elliptical columnar electrode plate. Further, electrodes 12 and 13 are formed of two cylindrical plates having different inner diameters, for example, a coaxial cylindrical capacitor, and one of the electrodes 12 and 13 is used in a state where the central axes of the electrodes are aligned. It may be placed inside the other.

また、本実施形態では、潤滑油の導電率の周波数特性を用いた。しかし、これに限らず、潤滑油の誘電率の周波数特性も用いたり、誘電率でも導電率でもない潤滑油の電気的特徴量を用いたり、この電気的特徴量も用いたりしてもよい。 Further, in the present embodiment, the frequency characteristic of the conductivity of the lubricating oil is used. However, the present invention is not limited to this, and the frequency characteristic of the dielectric constant of the lubricating oil may be used, the electrical feature amount of the lubricating oil which is neither the dielectric constant nor the conductivity may be used, or this electrical feature amount may also be used.

以上、この発明の実施形態につき、図面を参照して詳述してきたが、具体的な構成は上述の実施形態に限られるものではなく、この発明の要旨を逸脱しない範囲の設計なども含まれる。 Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the above-described embodiments, and includes designs within a range that does not deviate from the gist of the present invention. ..

なお、本発明は、例えば水圧機器に適用することもできる。 The present invention can also be applied to, for example, hydraulic equipment.

１、１Ａ 流体識別装置
１０、１０Ａ 周波数特性取得部
１１ 基部
１２、１３ 電極
１４ 電源部
１５、１５Ａ 取得部
２０、２０Ａ 記憶部
３０、３０Ａ 識別部 1,1A Fluid identification device 10, 10A Frequency characteristic acquisition unit 11 Base 12, 13 Electrode 14 Power supply unit 15, 15A Acquisition unit 20, 20A Storage unit 30, 30A Identification unit

Claims (4)

流体を識別する流体識別装置であって、
前記流体に印加する交流電圧の周波数を制御して、前記流体の電気的特徴量の周波数特性を取得する周波数特性取得部と、
前記流体の電気的特徴量の周波数特性を、流体の種類ごとに記憶する記憶部と、
前記周波数特性取得部により取得された周波数特性と、前記記憶部に記憶されている周波数特性と、を比較して、前記周波数特性取得部により周波数特性が取得された流体を識別する識別部と、を備え、
前記周波数特性取得部は、前記周波数特性として、
予め定められた周波数から前記交流電圧の周波数を変化させ、前記流体の電気的特徴量の周波数特性を表す曲線の傾きが閾値未満になった際における前記交流電圧の周波数および前記流体の電気的特徴量と、
前記曲線の傾きが前記閾値未満になった後に前記交流電圧の周波数をさらに変化させ、前記曲線が変曲点を迎えた際における前記曲線の傾きと、を取得することを特徴とする流体識別装置。 A fluid identification device that identifies fluids
A frequency characteristic acquisition unit that controls the frequency of the AC voltage applied to the fluid and acquires the frequency characteristics of the electrical features of the fluid.
A storage unit that stores the frequency characteristics of the electrical features of the fluid for each type of fluid,
A frequency characteristic obtained by the frequency characteristic acquisition unit, and the frequency characteristic stored in the storage block, by comparing the identification unit identifies the fluid frequency characteristic obtained by the frequency characteristic acquisition unit, With
The frequency characteristic acquisition unit has the frequency characteristic as the frequency characteristic.
The frequency of the AC voltage and the electrical characteristics of the fluid when the frequency of the AC voltage is changed from a predetermined frequency and the slope of the curve representing the frequency characteristics of the electrical features of the fluid becomes less than the threshold value. Amount and
A fluid identification device characterized in that the frequency of the AC voltage is further changed after the slope of the curve becomes less than the threshold value, and the slope of the curve when the curve reaches an inflection point is acquired. .. 流体を識別する流体識別装置であって、
前記流体に印加する交流電圧の周波数を制御して、前記流体の電気的特徴量の周波数特性を取得する周波数特性取得部と、
前記流体の電気的特徴量の周波数特性を、流体の種類ごとに記憶する記憶部と、
前記周波数特性取得部により取得された周波数特性と、前記記憶部に記憶されている周波数特性と、を比較して、前記周波数特性取得部により周波数特性が取得された流体を識別する識別部と、を備え、
前記周波数特性取得部は、前記周波数特性として、
予め定められた周波数から前記交流電圧の周波数を変化させ、前記流体の電気的特徴量の周波数特性を表す曲線の傾きが閾値以上になった際における前記交流電圧の周波数および前記流体の電気的特徴量と、
前記曲線の傾きが前記閾値以上になった後に前記交流電圧の周波数をさらに変化させ、前記曲線が変曲点を迎えた際における前記曲線の傾きと、を取得することを特徴とする流体識別装置。 A fluid identification device that identifies fluids
A frequency characteristic acquisition unit that controls the frequency of the AC voltage applied to the fluid and acquires the frequency characteristics of the electrical features of the fluid.
A storage unit that stores the frequency characteristics of the electrical features of the fluid for each type of fluid,
A frequency characteristic obtained by the frequency characteristic acquisition unit, and the frequency characteristic stored in the storage block, by comparing the identification unit identifies the fluid frequency characteristic obtained by the frequency characteristic acquisition unit, With
The frequency characteristic acquisition unit has the frequency characteristic as the frequency characteristic.
The frequency of the AC voltage and the electrical characteristics of the fluid when the frequency of the AC voltage is changed from a predetermined frequency and the slope of the curve representing the frequency characteristics of the electrical features of the fluid becomes equal to or greater than the threshold value. Amount and
A fluid identification device characterized in that the frequency of the AC voltage is further changed after the slope of the curve becomes equal to or higher than the threshold value, and the slope of the curve when the curve reaches an inflection point is acquired. .. 前記流体の電気的特徴量として、前記流体の誘電率と、前記流体の導電率と、のうち少なくともいずれかを用いることを特徴とする請求項１または２のいずれか１項に記載の流体識別装置。 The fluid identification according to any one of claims 1 or 2 , wherein at least one of the dielectric constant of the fluid and the conductivity of the fluid is used as the electrical feature amount of the fluid. apparatus. 前記識別部は、前記周波数特性取得部により取得された周波数特性と、記憶している周波数特性のそれぞれと、の類似度が所定値未満であるか否かを判断し、
前記記憶部は、前記識別部により前記類似度が前記所定値未満であると判断されると、前記周波数特性取得部により周波数特性が取得された流体についての情報の入力を受け付けて、前記周波数特性取得部により取得された周波数特性と、前記入力を受け付けた情報と、を関連づけて記憶することを特徴とする請求項１から３のいずれか１項に記載の流体識別装置。 The identification unit determines whether or not the similarity between the frequency characteristics acquired by the frequency characteristic acquisition unit and the stored frequency characteristics is less than a predetermined value.
When the identification unit determines that the similarity is less than the predetermined value, the storage unit receives input of information about the fluid whose frequency characteristics have been acquired by the frequency characteristic acquisition unit, and receives the input of information about the fluid whose frequency characteristics have been acquired by the frequency characteristic acquisition unit. The fluid identification device according to any one of claims 1 to 3 , wherein the frequency characteristic acquired by the acquisition unit and the information that has received the input are stored in association with each other.
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