JP2017211329A - Fluid identification device - Google Patents

Abstract

A fluid identification device for identifying fluid is provided. A fluid identification device (1) includes a frequency characteristic acquisition section (10), a storage section (20), and an identification section (30). The frequency characteristic acquisition unit 10 controls the frequency of the AC voltage applied to the fluid and acquires the frequency characteristic of the electrical feature quantity of the fluid. The storage unit 20 stores the frequency characteristic of the electrical feature quantity of the fluid for each type of fluid. The identifying unit 30 identifies the fluid whose frequency characteristic is acquired by the frequency characteristic acquiring unit 10 based on the frequency characteristic acquired by the frequency characteristic acquiring unit 10 and the frequency characteristic stored in the storage unit 20. . [Selection drawing] Fig. 1

Description

  The present invention relates to a fluid identification device.

  A technique for detecting a fluid state has been proposed (see, for example, Patent Document 1).

  Patent Document 1 discloses an oil deterioration detection device that determines deterioration of oil that is circulated and supplied to a rotating part and a sliding part and prevents the wear of these components to operate smoothly. This oil deterioration detection device includes two electrode plates installed in parallel to each other in the oil flow path, and an electric voltage and an electric permittivity of the oil are applied by applying an AC voltage between the two electrode plates. And the deterioration of the oil is judged based on the conductivity and the dielectric constant.

JP 2009-2893 A

  The electrical characteristics of the fluid, such as dielectric constant and conductivity, vary depending on the degree of fluid degradation, but also vary depending on the type of fluid, manufacturer, brand, and the like. However, in the oil deterioration detection device disclosed in Patent Document 1, no consideration is given to the relationship between the fluid type, manufacturer, brand, and the electrical characteristic amount of the fluid. For this reason, 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 characteristic amount of the fluid is obtained. However, the deterioration of the fluid could not be properly judged.

  Therefore, the present invention has been made in view of the above-described problems, and provides a fluid identification device that identifies a fluid.

  One or more embodiments of the present invention are fluid identification devices that identify a fluid, and control a frequency of an alternating voltage applied to the fluid to obtain a frequency characteristic of an electrical feature of the fluid. The frequency characteristic acquisition unit, the storage unit that stores the frequency characteristic of the electrical characteristic amount of the fluid for each type of fluid, the frequency characteristic acquired by the frequency characteristic acquisition unit, and the storage unit An identification unit for identifying the fluid whose frequency characteristic is acquired by the frequency characteristic acquisition unit based on the frequency characteristic, and the identification unit is an inclination of a curve representing the frequency characteristic of the electrical characteristic amount of the fluid And at least one of the frequency of the alternating voltage and the electrical characteristic amount of the fluid when the absolute value of the amount of change in the slope of the curve is greater than or equal to a threshold value, the frequency characteristic acquisition unit And more acquired frequency characteristic, the frequency characteristic stored in the storage unit, in compared, and wherein the identifying the fluid.

  According to one or more embodiments of the present invention, fluids can be identified.

1 is a block diagram of a fluid identification device according to a first embodiment of the present invention. It is a schematic block diagram of the frequency characteristic acquisition part with which the fluid identification device which concerns on 1st Embodiment of this invention is provided. It is a graph which shows an example of the frequency characteristic of the dielectric constant of lubricating oil. It is a flowchart of the fluid identification apparatus which concerns on 1st Embodiment of this invention. It is a block diagram of the fluid identification apparatus which concerns on 2nd Embodiment of this invention. It is a graph which shows an example of the frequency characteristic of the electrical conductivity of lubricating oil.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the constituent elements in the following embodiments can be appropriately replaced with existing constituent elements, and various variations including combinations with other existing constituent elements are possible. For this reason, the description of the following embodiments does not limit the contents of the invention described in the claims.

<First Embodiment>
FIG. 1 is a block diagram of a fluid identification apparatus 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.

  The frequency characteristic acquisition unit 10 controls the frequency of the AC voltage applied to the lubricating oil in the device, and acquires the frequency characteristic of the dielectric constant of the lubricating oil. The memory | storage part 20 memorize | stores the frequency characteristic of the dielectric constant of lubricating oil for every lubricating oil. The identification unit 30 identifies the lubricating oil whose frequency characteristic has been acquired by the frequency characteristic acquisition unit 10 based on the frequency characteristic acquired by the frequency characteristic acquisition unit 10 and the frequency characteristic stored in the storage unit 20. To do.

  FIG. 2 is a schematic configuration diagram of the frequency characteristic acquisition unit 10. The frequency characteristic acquisition unit 10 includes a columnar base 11, a pair of electrodes 12 and 13 erected on the base 11, a power supply unit 14, and an acquisition unit 15.

  The electrodes 12 and 13 are flat electrode plates and are arranged in parallel to 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 characteristics of the dielectric constant of the lubricating oil that may be put into the device, and is set in the range of 1 kHz to 100 MHz, for example.

  The acquisition unit 15 calculates the dielectric constant of the lubricating oil between the electrodes 12 and 13 in a state where an AC voltage whose frequency is controlled by the power supply unit 14 is applied to the electrodes 12 and 13. Get frequency characteristics of dielectric constant.

  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 parameters. These three parameters will be described below with reference to FIG.

  FIG. 3 is a graph showing an example of frequency characteristics of the dielectric constant of the lubricating oil. The frequency characteristics of the dielectric constant of the lubricating oil vary 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 type of lubricant, manufacturer, brand, etc. Varies greatly depending on. Therefore, in the present embodiment, the frequency characteristic acquisition unit 10 acquires 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 stored in the storage unit 20 and the frequency characteristic stored in the storage unit 20 are compared, and the lubricating oil whose frequency characteristic is acquired by the frequency characteristic acquisition unit 10 is identified.

First, the first frequency f1 will be described below.
As 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 characteristics of the dielectric constant of the lubricating oil gradually decreases. The first frequency f1 is the frequency of the alternating voltage when the slope of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil becomes less than a threshold value.

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.

Next, the slope of the curve Δε2 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 characteristics 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 inflection point of the curve representing the frequency characteristics of the dielectric constant of the lubricating oil is the second frequency f2, the curve slope Δε2 at the second frequency f2 is Is the slope at the second frequency f2 of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil.

  In addition, the memory | storage part 20 has memorize | stored beforehand the frequency characteristic of the dielectric constant of lubricating oil for every lubricating oil which may be thrown in in an apparatus. Although details will be described later with reference to FIG. 4, the storage unit 20 has a case where the similarity between the frequency characteristic acquired by the frequency characteristic acquisition unit 10 and the frequency characteristic 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 stored in the device that has received input from the user. It is newly stored in association with information about the lubricating oil.

  The frequency characteristic acquisition unit 10, the storage unit 20, and the identification unit 30 described above are realized using a CPU, a memory (RAM), a hard disk, and the like.

  The hard disk stores an operating system, a program for executing a series of processes for identifying 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 EPROM or flash memory, a CD-ROM, or the like.

  The CPU appropriately reads out data and programs stored in the hard disk using the memory as appropriate, and performs calculations and execution as appropriate.

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 to acquire the frequency characteristic of the dielectric constant of the lubricating oil, and the process proceeds to step S2. Move.
In addition, as time passes after lubricating oil is thrown into an apparatus, the state of lubricating oil changes by oxidation of a lubricating oil, foreign material mixing, etc., and the dielectric constant of lubricating oil also changes. For this reason, the fluid identification device 1 performs the process of step S1 during a period until a predetermined time elapses after the lubricating oil is supplied to the device.

  In step S2, the fluid identification device 1 calculates the similarity between the frequency characteristic acquired in step S1 and the frequency characteristic stored in the storage unit 20 by the identification unit 30, and performs the process in step S3. Move.

The calculation of the similarity in step S2 will be described in detail below.
For example, a case where 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 is calculated will be described. In this case, first, the similarity between each of the above-described three parameter values acquired in step S1 and each of the above-described 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 characteristics acquired in step S <b> 1 and the frequency characteristics of the lubricating oil A stored in the storage unit 20.

  In step S3, the fluid identification device 1 determines whether the highest one of the similarities calculated in step S2 is less than a predetermined value by the identification unit 30. If the identification unit 30 determines that the fluid identification device 1 is less than the predetermined value, that is, if a frequency characteristic similar or identical to the frequency characteristic acquired in step S1 is not stored in the storage unit 20, the step The process is moved to S4. On the other hand, if it is determined that the frequency characteristic is equal to or greater than the predetermined value, that is, if a frequency characteristic similar or identical to the frequency characteristic acquired in step S1 is stored in the storage unit 20, the process proceeds to step S5.

In step S4, the fluid identification device 1 causes the identification unit 30 to store the frequency characteristics acquired in step S1 in the storage unit 20, and ends the process illustrated in FIG.
In addition, after the process of step S4, the fluid identification device 1 receives the input of the type of lubricant in the device, the manufacturer, and the brand from the user, and the frequency characteristics stored in the storage unit 20 in step S4 are lubricated. Associate oil types, manufacturers, and brands.

  In step S <b> 5, the fluid identification device 1 uses the identification unit 30 to add lubricating oil having the frequency characteristic when the highest similarity is calculated in step S <b> 2 among the frequency characteristics stored in the storage unit 20. And the process shown in FIG. 4 is terminated.

  As described above, the fluid identification device 1 acquires the frequency characteristic of the dielectric constant of the lubricating oil by the frequency characteristic acquisition unit 10, the frequency characteristic acquired by the frequency characteristic acquisition unit 10 by the identification unit 30, and the storage unit The lubricating oil is identified based on the frequency characteristics for each lubricating oil stored in the memory 20. For this reason, the lubricating oil in an apparatus can be identified using the frequency characteristic of the dielectric constant of lubricating oil.

  In addition, the fluid identification device 1 has a frequency characteristic of the dielectric constant of the lubricating oil, ie, 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 two parameters. For this reason, since it is possible to identify the lubricating oil using parameters that vary greatly depending on the type, manufacturer, and brand of the lubricating oil, it is possible to appropriately identify the lubricating oil in the device.

  In addition, 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 the highest similarity is obtained. Is less than the predetermined value, the frequency characteristic acquired by the frequency characteristic acquisition unit 10 is stored in the storage unit 20. For this reason, when a frequency characteristic similar or identical to 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 received, and the received information is associated with the frequency characteristics newly stored in the storage unit 20. Thus, the lubricating oil that can be identified by the fluid identification device 1 can be increased.

Further, as time elapses after the lubricating oil is supplied to 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 acquiring unit 10 during a period until a predetermined time elapses after the lubricating oil is supplied to the device. For this reason, it is possible to suppress the influence with time of the frequency characteristics of the dielectric constant of the lubricant to be acquired, and it is possible to appropriately identify the lubricant in the device.

  In the present embodiment, the frequency characteristics of the dielectric constant of the lubricating oil include three frequencies: a first frequency f1, a dielectric constant ε1 at the first frequency f1, and a 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.

  Further, in the present embodiment, the above three parameters are obtained by increasing the frequency of the AC voltage applied between the electrodes 12 and 13 from the lower limit frequency fmin. However, the present invention is not limited to this, and the above three parameters may be obtained by lowering the frequency of the AC voltage applied between the electrodes 12 and 13 from the upper limit frequency fmax.

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 inflection point of the curve representing the frequency characteristic of the dielectric constant of the lubricating oil is increased. The frequency was 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, the present invention is not limited to this, and the fifth frequency f5 is obtained in FIG. 3, and the slope of the above curve between the first frequency f1 and the fifth frequency f5 is expressed as It may be used instead.
When the frequency of the alternating 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 the inflection point. The slope of gradually increases. 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 is equal to or greater than a threshold value.

  In this embodiment, the frequency of the AC voltage applied between the electrodes 12 and 13 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 in the present embodiment. Was the frequency of the alternating voltage when the value was less than the threshold. However, the present invention is not limited to this, and the first frequency f1 is increased from the lower limit frequency fmin to the frequency of the alternating voltage applied between the electrodes 12 and 13, and the dielectric constant is predetermined with respect to the dielectric constant at the lower limit frequency fmin. It is good also as the frequency of the alternating voltage at the time of reducing only the ratio.

  In the present embodiment, the lubricating oil in the device is identified. However, the present invention is not limited to this, and any fluid can be identified.

  Moreover, in this embodiment, the electrodes 12 and 13 were formed with the flat electrode plate, and these electrodes 12 and 13 were arrange | positioned in parallel with each other. However, the present invention is not limited to this, and the electrodes 12 and 13 may be formed of, for example, a cylindrical or elliptical pole plate. Further, for example, electrodes 12 and 13 are formed by two cylindrical electrode plates having different inner diameters such as a coaxial cylindrical capacitor, and either one of the electrodes 12 and 13 is set in a state where the respective central axes coincide with each other. You may arrange | position inside the other.

  In this 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, or an electrical feature value of the lubricating oil that is neither dielectric constant nor conductivity may be used, or this electrical feature value may also be used.

Second Embodiment
FIG. 5 is a block diagram of a fluid identification apparatus 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 equipment 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 equipment 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. In addition, about the part which has the same form as 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  10 A of frequency characteristic acquisition parts control the frequency of the alternating voltage applied to the lubricating oil in an apparatus, and acquire the frequency characteristic of the electrical conductivity of 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 characteristic is acquired by the frequency characteristic acquisition unit 10A based on the frequency characteristic acquired by the frequency characteristic acquisition unit 10A and the frequency characteristic stored in the storage unit 20A. To do.

  The frequency characteristic acquisition unit 10A is different from the frequency characteristic acquisition unit 10 according to the first embodiment of the present invention illustrated in FIG. 2 in that an acquisition unit 15A is provided instead of the acquisition unit 15. The acquisition unit 15A has three parameters, namely, the third frequency f3, the conductivity σ3 at the third frequency f3, and the slope Δσ4 of the curve at the fourth frequency f4 as frequency characteristics of the conductivity of the lubricating oil. get. These three parameters will be described below with reference to FIG.

  FIG. 6 is a graph showing an example of frequency characteristics of the conductivity of the lubricating oil. The frequency characteristics of the conductivity of the lubricating oil vary depending on the type of lubricant, manufacturer, brand, etc. 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 lubricant, manufacturer, brand, etc. 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. By comparing the frequency characteristic thus obtained with the frequency characteristic stored in the storage unit 20A, the lubricating oil whose frequency characteristic has been acquired by the frequency characteristic acquisition unit 10A is identified.

First, the third frequency f3 will be described below.
As 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 characteristics 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 is equal to or greater than a threshold value.

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.

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 characteristics of the conductivity of the lubricating oil reaches an inflection point. When the frequency of the AC voltage applied between the electrodes 12 and 13 at the inflection point of the curve representing the frequency characteristics of the conductivity of the lubricating oil is the fourth frequency f4, the slope of the curve Δσ4 at the fourth frequency f4 is Is the slope at the fourth frequency f4 of the curve representing the frequency characteristic of the conductivity of the lubricating oil.

  The frequency characteristic acquisition unit 10A, the storage unit 20A, and the identification unit 30A described above are realized using a CPU, a memory (RAM), a hard disk, and the like in the same manner as the frequency characteristic acquisition unit 10, the storage unit 20, and the identification unit 30. The

  The fluid identification device 1A described above can achieve the same effects as the fluid identification device 1 according to the first embodiment of the present invention.

  In the present embodiment, the frequency characteristics of the conductivity of the lubricating oil include three frequencies: a third frequency f3, a conductivity σ3 at the third frequency f3, and a 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.

  Further, in the present embodiment, the above three parameters are obtained by increasing the frequency of the AC voltage applied between the electrodes 12 and 13 from the lower limit frequency fmin. However, the present invention is not limited to this, and the above three parameters may be obtained by lowering the frequency of the AC voltage applied between the electrodes 12 and 13 from the upper limit frequency fmax.

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 inflection point of the curve representing the frequency characteristic of the conductivity of the lubricating oil is increased. The frequency is the fourth frequency f4, and the slope Δσ4 of the curve at the fourth frequency f4 is used as one of the above three parameters. However, the present invention is not limited to this, and the sixth frequency f6 in FIG. 6 is obtained, and the slope of the curve between the third frequency f3 and the sixth frequency f6 is expressed as 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 slope of gradually decreases. 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.

  In this embodiment, the frequency of the alternating voltage applied between the electrodes 12 and 13 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 in the present embodiment. The frequency of the alternating voltage when the value is equal to or greater than the threshold value was used. However, the present invention is not limited to this, and the third frequency f3 is increased from the lower limit frequency fmin to the frequency of the AC voltage applied between the electrodes 12 and 13, and the conductivity is predetermined with respect to the conductivity at the lower limit frequency fmin. It is good also as the frequency of the alternating voltage at the time of increasing only the ratio.

  In the present embodiment, the lubricating oil in the device is identified. However, the present invention is not limited to this, and any fluid can be identified.

  Moreover, in this embodiment, the electrodes 12 and 13 were formed with the flat electrode plate, and these electrodes 12 and 13 were arrange | positioned in parallel with each other. However, the present invention is not limited to this, and the electrodes 12 and 13 may be formed of, for example, a cylindrical or elliptical pole plate. Further, for example, electrodes 12 and 13 are formed by two cylindrical electrode plates having different inner diameters such as a coaxial cylindrical capacitor, and either one of the electrodes 12 and 13 is set in a state where the respective central axes coincide with each other. You may arrange | position inside the other.

  In this 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, or the electrical characteristic amount of the lubricating oil that is neither the dielectric constant nor the conductivity may be used, or the electrical characteristic amount may be used.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above-described embodiment, and includes a design within a range not departing from the gist of the present invention. .

  The present invention can also be applied to, for example, a hydraulic device.

DESCRIPTION OF SYMBOLS 1, 1A Fluid identification device 10, 10A Frequency characteristic acquisition part 11 Base part 12, 13 Electrode 14 Power supply part 15, 15A Acquisition part 20, 20A Storage part 30, 30A Identification part

Claims (5)

A fluid identification device for identifying a fluid, comprising:
A frequency characteristic acquisition unit that controls a frequency of an alternating voltage applied to the fluid to acquire a frequency characteristic of an electrical characteristic amount of the fluid;
A storage unit that stores the frequency characteristics of the electrical characteristic amount of the fluid for each type of fluid;
An identification unit for identifying a fluid whose frequency characteristic is acquired by the frequency characteristic acquisition unit based on the frequency characteristic acquired by the frequency characteristic acquisition unit and the frequency characteristic stored in the storage unit; Prepared,
The identification unit includes a slope of a curve representing a frequency characteristic of the electrical characteristic amount of the fluid, a frequency of the alternating voltage when an absolute value of a change amount of the slope of the curve is equal to or greater than a threshold value, and an electrical property of the fluid. Comparing the frequency characteristic acquired by the frequency characteristic acquisition unit with the frequency characteristic stored in the storage unit for at least one of the feature amount and identifying the fluid, Fluid identification device. The identification unit is
When the frequency of the AC voltage is changed from a predetermined frequency and the slope of the curve representing the frequency characteristic of the electrical characteristic quantity of the fluid becomes less than the threshold, the frequency of the AC voltage and the electrical property of the fluid Features and
Further changing the frequency of the AC voltage after the slope of the curve is less than the threshold, the slope of the curve when the curve reaches an inflection point,
The fluid identification device according to claim 1, wherein at least one of the frequency characteristics is compared between the frequency characteristic acquired by the frequency characteristic acquisition unit and the frequency characteristic stored in the storage unit. The identification unit is
The frequency of the AC voltage is changed from a predetermined frequency, and the frequency of the AC voltage when the slope of the curve representing the frequency characteristic of the electrical characteristic quantity of the fluid becomes equal to or greater than the threshold value and the electrical property of the fluid. Features and
Further changing the frequency of the AC voltage after the slope of the curve is equal to or greater than the threshold, the slope of the curve when the curve reaches an inflection point,
The fluid identification device according to claim 1, wherein at least one of the frequency characteristics is compared between the frequency characteristic acquired by the frequency characteristic acquisition unit and the frequency characteristic stored in the storage unit.   The fluid identification apparatus according to claim 1, wherein at least one of a dielectric constant of the fluid and an electrical conductivity of the fluid is used as the electrical characteristic amount of the fluid. The identification unit determines whether the similarity between the frequency characteristic acquired by the frequency characteristic acquisition unit and each of 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 characteristic is acquired by the frequency characteristic acquisition unit, and the frequency characteristic 5. The fluid identification device according to claim 1, wherein the frequency characteristic acquired by the acquisition unit and the information that has received the input are stored in association with each other. 6.

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