JPS59162443A - Method and device for evaluating performance of dielectric material - Google Patents

Abstract

PURPOSE:To evaluate the performance of a dielectric material, by applying a pulse to a pair of electrodes which are provided on the dielectric material to be measured from a power source means, and measuring a transient response current flowing through the electrode in correspondence with the components of the dielectric material between the electrode. CONSTITUTION:When a pulse voltage 2 is applied to electrodes 1, which are provided on a dielectric material, from a voltage source 2, the dielectric material between the electrodes 1 is charged, and a current flows through the dielectric material. The current has different trnasient responses depending on the properties of the dielectric materials. Therefore the current is detected by a current detecting means 3, and the transient response characteristics are analyzed by a signal processing means 4. The processing means 4 measures the transient characteristics, i.e., the peak value of the current, the amount of change in current in a specified time within the period of pulse-voltage application, the ratio between the peak value and the amount of change in current, and the like. Based on the results, indexes corresponding to the performance of the dielectric material can be displayed on a display means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for evaluating the performance of dielectric materials such as lubricating oil, cutting oil, cooling oil, etc.

Generally speaking, dielectric materials such as oil and grease are mentioned above.

Performance gradually changes due to the process of use and changes over time. For example, lubricating oil is used as a lubricant for mechanical friction parts in engine mechanisms of automobiles and ships, and industrial equipment such as machine tools and textile machines. This lubricant.

In the course of its use, the lubricating performance of the lubricating oil gradually decreases due to the mixing of metal powder into the lubricating oil and the oxidation and modification of the lubricating oil itself.

Especially the lubricating oil used in internal combustion engines. The performance deterioration during the process of use is severe. In order to maintain the characteristics of an internal combustion engine, the lubricating oil must be periodically inspected for diagnosis and replaced if its performance has deteriorated.

As a means to understand the performance deterioration of this lubricating oil.

Conventional/Decrease in viscosity. Degree of oxidation. Increase in residual carbon.

Measure the increase in insoluble matter through quantitative analysis, or use electrical methods.

It was measured as a change in permittivity or conductivity.

However, in the prior art, in order to perform quantitative analysis, it is necessary to pour out lubricating oil from the internal combustion engine and conduct analysis using a chemical method. This is not a practical method because it takes a huge amount of time and requires expensive measuring equipment, which itself is complicated.

In addition, although it is easy to understand the performance of lubricating oil from changes in its dielectric constant and conductivity, it is difficult to accurately determine its performance with only a single piece of information about the dielectric constant and conductivity. It is not possible.

In other words, the initial performance of lubricating oil for internal combustion engines varies depending on the types of additives it contains.
Large differences occur in permittivity and conductivity. Furthermore, the performance of lubricating oil varies depending on the operating conditions of the internal combustion engine.
Merely measuring dielectric constant or conductivity has the disadvantage that it does not directly correlate with the original performance of lubricating oil.

Furthermore, when it comes to lubricating oils for automobiles, especially engine oils, sensory tests such as mileage, color, and texture (viscosity and insoluble matter are tested with a fingertip) have not been commonly performed. There is. However, this method has nothing to do with the performance of lubricating oil.

It's not reasonable.

In other words, since this method cannot grasp the essential performance of the lubricating oil, an instruction to replace the lubricating oil is given simply based on indirect information such as the mileage or the state of contamination. This results in wasted lubricating oil, which is an extremely serious industrial problem from the perspective of resource conservation.

The present invention solves the various problems mentioned above, and includes:
The original performance of dielectric substances such as lubricating oils and cutting oils to be measured can be directly and easily evaluated using a simple method and equipment with high precision and reliability, and the state of contamination and usage limits can be evaluated. The main purpose of this invention is to provide an extremely effective method and device for evaluating the performance of dielectric materials, which can determine the performance of dielectric materials and contribute to the saving of resources such as lubricating oil.

Another object of the present invention is to apply a pulse voltage from a power supply means to at least one pair of electrodes facing a dielectric substance to be measured, and to apply a pulse voltage between seven electrodes corresponding to the components of the dielectric substance interposed between the electrodes. The present invention provides a method and apparatus for evaluating the performance of a dielectric material, which measures a flowing transient response current and evaluates the performance of the dielectric material from the current value.

Furthermore, another object of the present invention is to apply a pulse voltage from a power supply means to at least one pair of electrodes facing a dielectric substance to be measured, and to apply a pulse voltage to the electrodes in response to the components of the dielectric substance interposed between the electrodes. detecting the current flowing between them by a current detection means, and measuring a change in the current by a processing means,
The present invention provides a method and apparatus for evaluating the performance of a dielectric material from the transient response characteristics of the dielectric material when the pulse voltage is applied.

Another object of the present invention is to grasp the properties proportional to the conductivity in the dielectric material (due to metal powder, residual carbon, charged ions, etc.) by grasping the peak value of the transient response current, and to An object of the present invention is to provide a method and apparatus for evaluating the performance of substances.

Furthermore, another object of the present invention is to understand the properties (due to water, molecular ions, etc.) proportional to the dielectric constant in the dielectric material by understanding the amount of change in the current in a certain time span of the transient response current. An object of the present invention is to provide a method and apparatus for evaluating the performance of dielectric materials.

Further, an object of the present invention is to determine the peak value of the transient response current;
The present invention provides a method and apparatus for evaluating the performance of dielectric materials by understanding the conductivity and dielectric constant-proportional properties of dielectric materials by determining the ratio to the amount of change in current within a certain period of time. be.

According to the present invention, a pulse voltage is applied from a power supply means to at least one pair of electrodes facing a dielectric substance to be measured, and a voltage is applied between the electrodes in accordance with the components of the dielectric substance interposed between the electrodes. This is a method for evaluating the performance of a dielectric material (hereinafter referred to as the first invention), which is characterized by measuring a flowing transient response current and evaluating the performance of the dielectric material from the current value.

In addition, in one aspect of the present invention, a pulse voltage is applied from a power supply means to at least a pair of electrodes facing a dielectric substance to be measured,
A current flowing between the electrodes is detected by a current detection means in accordance with a component of a dielectric substance interposed between the electrodes, and
A method for evaluating the performance of a dielectric material, characterized in that the change in the current is measured by a processing means, and the performance of the dielectric material is evaluated from the transient response characteristics of the dielectric material when the pulse voltage is applied (hereinafter referred to as (referred to as the second invention).

Furthermore, in the second aspect of the present invention, the measurement of the current change by the processing means is performed such that the measurement of the current change by the processing means determines the peak value of the current value at an arbitrary position of the current flowing between the electrodes due to the transient response of the dielectric substance, and the peak value of the current value at the arbitrary position. 8. The dielectric material is characterized in that the process is performed using at least one of the amount of current change within a certain period of time and the ratio calculated by dividing the peak value and the amount of current change after a certain period of time from the peak value. This is a performance evaluation method (hereinafter referred to as the first aspect of the second invention).

In the second invention, the method for evaluating the performance of a dielectric material is characterized in that the voltage applied to the electrode by the power supply means generates a pulse voltage of a constant amplitude and a constant time width (hereinafter referred to as the second aspect of the second invention). (referred to as aspects).

The present invention also provides at least a pair of electrodes facing a dielectric substance to be measured, a power supply means for applying a pulse voltage to the electrodes, and a gap between the electrodes corresponding to the components of the dielectric substance interposed between the electrodes. This is a performance evaluation device for a dielectric material (hereinafter referred to as the eighth invention), comprising means for measuring a transient response current flowing through the dielectric material, and evaluating the performance of the dielectric material from the measured current value.

Furthermore, the present invention includes at least one pair of electrodes facing a dielectric substance to be measured.

and power supply means for applying a pulse voltage to the electrode.

M, a current detection means for detecting a current flowing between the electrodes in accordance with a component of a dielectric substance interposed between the electrodes;

and processing means for measuring changes in the current.

This is a performance evaluation device for a dielectric material, characterized in that the performance of the dielectric material is evaluated from the transient response characteristics of the dielectric material when the pulse voltage is applied (hereinafter referred to as the fourth invention).

Moreover, in the fourth invention, the processing means.

This is a performance evaluation device for a dielectric material, characterized in that it is a peak detection means for measuring a peak value of a current flowing between the electrodes at an arbitrary position due to a transient response of the dielectric material (hereinafter referred to as No. 4). (referred to as the first aspect of the invention)
.

In the fourth invention, the processing means includes a peak detection means and a differential calculation means for measuring the amount of change in the current flowing between the electrodes at an arbitrary position within a certain period of time due to a transient response of the dielectric material. This is a performance evaluation device for dielectric materials (hereinafter referred to as the second aspect of the fourth invention).

Further, in the fourth invention, the processing means performs a calculation by dividing a peak value at an arbitrary position of the current flowing between the electrodes due to a transient response of the dielectric material and an amount of change in the current after a certain period of time has elapsed from the peak value. and a performance evaluation device for dielectric materials characterized by comprising a peak detection means, a differential calculation means, and a division calculation means for measuring the ratio between the peak value and the amount of change in current (hereinafter referred to as (referred to as the third aspect of the fourth invention).

Furthermore, in the fourth invention, the power supply means has a constant amplitude;
This is a performance evaluation device for a dielectric material (hereinafter referred to as a fourth aspect of the fourth invention), characterized in that it has a function of generating a bias voltage of a certain period of time.

Next, the basic principle of the dielectric material performance evaluation method and device of the present invention will be explained based on FIGS. 1 and 2.

The dielectric material facing the pair of electrodes is shown by the equivalent circuit (2) in FIG. 1(a), and is represented by the internal resistance jo of the dielectric material and the capacitance C due to the dielectric constant ε8.

In this equivalent circuit I, when a step voltage V is applied from the power supply E by the switch S as shown in FIG.
In the equivalent circuit I, i=sip (-sip) r.

A transient response current flows. This current i is shown in Figure 1(b).
This will be explained in detail using the current waveform.

Immediately after the voltage V is applied to the pair of electrodes, a current of -rO flows, but the current decreases exponentially as time passes. This is because charge is gradually stored in the capacitance C of the dielectric material.

Here, γ0 and C are variables depending on the dielectric material.

It varies greatly depending on its type and properties. For example, in the transient response current i, the A characteristic is when rO is small and C is large, and the B characteristic is when TO is large and C is small. In this human characteristic, if the initial value of the transient response current within a certain time is ipl, and the current after the certain time is iml, iPl is the dielectric constant ε8 of the dielectric material.
depends on. Therefore, when ipl is large, it can be said that the dielectric constant ε8 of the metal in the dielectric material is small and the electric capacitance C is small.

From the above transient response current characteristics, comparing A characteristic and B characteristic, o tp, ) 1 pzo ip, -imt (ip2 - im2), the dielectric material of A characteristic has a lower conductivity and conductivity than that of B characteristic. It can be determined if the dielectric constant is large.

FIG. 2 shows an example in which the transient response current in this dielectric material was measured using engine oil, which is representative of actual lubricating oil.

Figure 2 ta+ is unused engine oil, (b) is 80
After running on the 00 axis, (C) shows the current characteristics after running for 17.000 ky.

Table 1 shows ip and ip-im, that is, Δi, calculated from each current waveform.

(Table 1) And the semi-P increases in proportion to the distance traveled, and △i & decreases in proportion to the distance traveled.

This increase in IP is due to lubricating oil such as engine oil.

During the process of use, metal powder and residual carbon increase.

It is thought that the conductivity gradually increases.

Furthermore, the decrease in Δi is considered to be due to the fact that the dielectric constant of the engine oil itself gradually increases during the course of its use due to the influence of moisture, insoluble matter, etc.

Therefore, use lubricating oil such as engine oil.

It can be determined that the larger the ip and the smaller the Δ amount, the more likely the sexual ability will be reduced.

Therefore, ip depends on the conductivity of the dielectric material.

△i, which depends on the permittivity, is calculated as ip/△i,
Table 1 shows the ratio. In other words, the period of use of the oil (mileage #) is proportional to this.

Since the ratio increases, this value becomes an effective means for evaluating the performance of dielectric materials such as engine oil.

Based on the above basic principles and numerous experimental considerations, a dielectric material such as lubricating oil is applied to a pair of electrodes, and a pulsed voltage is applied to the electrodes. within the period. By measuring the peak value of the transient response current flowing between the electrodes, the amount of change within a certain period of time, or the ratio between the peak value and the amount of change, it is possible to directly determine the original performance of dielectric materials with high accuracy and reliability. And it can be easily evaluated.

Hereinafter, specific examples of the method and apparatus for evaluating the performance of dielectric materials of the present invention will be described.

The method and apparatus for evaluating the performance of a dielectric material according to an embodiment shown in FIG. A pulse voltage is applied to the electrode 1 from the power supply means 2, a transient response current flowing between the electrodes is measured in accordance with the components of the dielectric material interposed between the electrodes 411, and the performance of the dielectric material is determined from the current value. This is a method of evaluating Furthermore, this embodiment corresponds to at least a pair of electrodes I facing the dielectric substance to be measured, a power supply means 2 for applying a pulse voltage to the electrodes, and a component of the dielectric substance interposed between the electrodes. and a means for measuring the transient response current flowing between the electrodes, and the device evaluates the performance of the dielectric material based on the measured current.

More specifically, in this embodiment, a pulse voltage is applied from the power supply means 2 to at least one pair of electrodes on the left facing the dielectric substance to be measured, and this corresponds to the components of the dielectric substance interposed between the electrodes 1. The current flowing between the electrodes 1 is detected by the current detection means 8.

In this method, the change in the current is measured by the processing means 4, and the performance of the dielectric material is evaluated from the transient response characteristics of the dielectric material when the pulse voltage is applied.

The apparatus of this embodiment includes a pair of electrodes 1 facing the dielectric substance to be measured, a voltage source 2 that applies a pulse voltage to the electrode 1, and a pulse voltage applied to the voltage fM1. a current detection means 8 for detecting a transient response current flowing through body substances; a mesa processing means 4 for receiving the output of the current detection means 8 and analyzing the characteristics of the transient response current;
In the method and apparatus of this embodiment, the device comprises a display means 5 for displaying the performance value of the dielectric material according to the output of the signal processing means 4, and the dielectric material is When a pulsed voltage is applied to the electrodes 1 facing the body substance, the dielectric material present between the electrodes 1 is charged, and a current flows through the dielectric material. Since the transient response of this current varies depending on the properties (conductivity, permittivity, etc.) of the dielectric material, this current is detected by the current detection means 8, and the transient response characteristics are measured by the signal processing means 4. Analyze by The signal processing means 4 measures the transient response characteristics of the current, that is, the peak value of the current, the amount of current change within a certain time period within the pulse voltage application period, the ratio of the peak value to the amount of current change, etc., and calculates the result. This is displayed on the display means 5 using an index based on the performance of the dielectric material.

Performance evaluation of dielectric materials can be expressed in terms of the degree of contamination and usage limit (life) for lubricating oil for automobiles, etc.

Furthermore, the type of lubricating oil and the degree of modification due to aging can also be displayed.

The performance evaluation device for dielectric materials based on the above-described principles and configuration has an extremely simple configuration, can accurately detect the performance of dielectric materials, and has great industrial effects.

Further, the voltage source 2 may be any voltage source that causes a transient response in the dielectric material, and it goes without saying that a pulse voltage or a step voltage may be used.

Furthermore, the current detection means 8 may be a signal proportional to the transient response current flowing in the dielectric material, and may be measured from the amount of voltage drop in the voltage source 2.

Further, the electrode 1 facing the dielectric material may be a parallel plate electrode as long as it has a structure that can charge the dielectric material.

Needless to say, a cylindrical electrode or a multilayer electrode may also be used.

The method and apparatus for evaluating the performance of a dielectric material according to the embodiment shown in FIG. 4 belong to the first aspect of the second invention, the fourth invention, and the first aspect thereof, and are described below.

The same parts as in the above example are indicated by the same reference numerals, and the evaluation is as follows:
This is a method for evaluating the performance of a dielectric material, in which the peak value of the current flowing between the electrodes is determined at an arbitrary position due to a transient response of the dielectric material. Furthermore, this embodiment includes a pair of electrodes 1 facing a dielectric material, a voltage source 2 for applying a pulse voltage to the electrodes 1, and a voltage source 2 for applying a pulse voltage to the electrode 1. a current detection means 8 for detecting a transient response current flowing through a dielectric substance between the two; and a peak detection means 4 for detecting a peak current at an arbitrary position of the transient response current detected by the current detection means 3.
0 and a display means 5 for displaying the output value of the peak detection means 40 as a performance value of the dielectric material. This is because the peak value of the current at a given position (after a given time has elapsed after applying a pulse voltage) due to the transient response of the material depends on the conductivity of the dielectric material.

From this peak value, for example, in lubricating oil for automobiles, it is possible to determine the amount of metal powder and residual carbon that are mixed into the oil during its use, and the performance of the lubricating oil can be ascertained.

The method and apparatus for evaluating the performance of a dielectric material according to the embodiment shown in FIG. 5 belong to the first aspect of the second invention, the fourth invention, and the second aspect thereof, in which the processing means This method evaluates the performance of a dielectric material by measuring the amount of change in current flowing between the electrodes at any position within a certain period of time due to the transient response of the material. Further, in this embodiment, a pair of electrodes 1 facing a dielectric material, a voltage source 2 for applying a pulse voltage to the electrodes 1, and a gap between the electrodes 1 when a pulse voltage is applied to the electrodes 1 are provided. The current detection means 8 detects the transient response current flowing through the dielectric material of the current detection means 8, and the peak detection means 40 detects the amount of current change within a fixed time at an arbitrary position of the transient response current detected by the current detection means 8. a processing circuit means 4 consisting of a dynamic calculation means 41;
In the method and apparatus of this embodiment, the display means 5 is configured to display the output value of the differential calculation means 41 as a performance value of the dielectric material. This is because when a pulse voltage is applied to a dielectric material, the amount of current change within a certain period of time due to the transient response of the dielectric material depends on the dielectric constant of the dielectric material.

For example, in lubricating oil for automobiles, etc., from the amount of change in current.

It is possible to determine the amount of water and dielectric insoluble matter mixed into the oil during its use.

The processing circuit means 4 for detecting this amount of current change will be explained with reference to the signal waveforms shown in FIG.

The time width of the pulse voltage output from voltage source l is T O+
Let the voltage value be V. The pulse voltage (Fig. 6-(a)
)) is applied to the electric current ml faced by the dielectric material,
A transient response current i as shown in FIG. 6-(b) flows through the dielectric material between the electrodes.

The initial value of the current i is the internal resistance of the dielectric material r. Then i
This value is expressed as =■/ro, but since the dielectric material between the electrodes is not sufficiently charged, this value depends on all conductive objects mixed into the dielectric material. I can't reach it. However, the current ip after an arbitrary period of time has elapsed after the application of the PURNU voltage is the value when the conductive object between the electrodes is sufficiently charged. It has a function of detecting the peak value ip of the transient response current after a certain period of time has elapsed.

(FIG. 6-((+)) The transient response current ip detected by the peak value detection means 40 is
The transient response current after the certain period of time is input to the other input terminal.

By performing differential calculation, the amount of change Δi (FIG. 6-(d)) in the transient response current within a certain period of time can be easily detected.

The method and apparatus for evaluating the performance of a dielectric material according to the embodiment shown in FIG. 7 belong to the first aspect of the second invention and the third aspect of the fourth invention, in which the processing means This method evaluates the performance of a dielectric material by dividing the peak value at an arbitrary position of the current flowing between the electrodes due to the transient response of the current and the amount of change in the current after a certain period of time has elapsed from the peak value. Furthermore, this embodiment includes a pair of electrodes 1 facing a dielectric material, a voltage source 2 for applying a pulse voltage to the electrodes 1, and a voltage source 2 for applying a pulse voltage to the electrodes 1. A current detection means 8 detects the transient response current flowing through the dielectric material of the current detection means 8, and the ratio of the peak value of the current at an arbitrary position of the transient response current detected by the current detection means 8 to the amount of current change within a certain period of time. peak detection means 40 and differential calculation means 41 for calculating.

This device is composed of a processing circuit means consisting of a dividing means 42, and a display means 5 for displaying the output value of the dividing means 42 as a performance value of the dielectric material.

According to the method and apparatus of this embodiment having such a configuration, the contaminant that depends on the conductivity in the dielectric substance detected by the embodiment shown in FIG. 4 above, and the method shown in FIG. As an example, it is possible to grasp the synergistic characteristics with a contaminant that depends on the dielectric constant in the detected dielectric material, and the performance of the dielectric material can be accurately measured.

For example, in lubricating oil for automobiles, conductive substances such as metal powder and residual carbon increase during the use process, and the peak value of the transient response current when a pulse voltage is applied increases (
Become.

In addition, as moisture and dielectric insoluble matter increase, the dielectric constant becomes thicker (because the - of the transient response current is larger,
If the lubricating oil has a high electrical conductivity (1, it can be determined that the dielectric constant is large due to force). From the value of P/△i, it is possible to accurately measure the lubricating oil's performance, contamination state, and usage limit. .

The method and apparatus for evaluating the performance of a dielectric material according to the embodiment shown in FIG. 8 belong to the second aspect of the second invention and the fourth aspect of the fourth invention, in which the voltage applied to the electrodes by the power supply means is This method generates a pulse voltage of a constant amplitude and a constant time duration. Further, in this embodiment, the voltage source 2 is a device comprising a power source 20 that generates an arbitrary DC voltage and a switch means 21 that can set an arbitrary time width. According to the method and device of this embodiment having such a configuration, a pulse voltage having an arbitrary voltage value and an arbitrary duration can be applied to the dielectric material facing between the pair of electrodes l. can.

This makes it possible to select the optimum transient response characteristic depending on the type of dielectric material, and to evaluate the performance of the dielectric material with maximum sensitivity.

Next, when a pulse voltage is applied, the transient response current that flows through the dielectric material between the electrodes 1 is transferred to a current-to-voltage conversion element 30 using a resistor, etc., and an LPF circuit that removes power supply hum mixed into the transient response current. The current is detected by the current detection means 3 consisting of 31.

According to the current detection means 3 having such a configuration, in a dielectric material that can easily convert the transient response current into a voltage signal and exhibits an extremely high resistance value, the LPF eliminates the hum mixed into the current signal when measuring the current. By removing the current, an accurate transient response current can be detected.

Next, the processing circuit means 4 is connected to the gate means 43. Peak detection means 40. It is composed of a differential calculation means 41 and a division means 42. In such an arrangement, the gating means 48 is activated by a signal for starting said voltage source 2.

The gate signal delayed by an arbitrary time is transmitted to the switch means 21.
is energized from.

Therefore, the transient response current immediately after the pulse voltage is applied to the electrode 1t is cut off by the gate means 43.

No voltage is applied to the peak detection means 40.

That is, by the action of the gate means 48, among the transient response currents, a pulse voltage is applied and only a current signal within a certain time after an arbitrary time has elapsed can be detected. The value and the amount of change in the current within a certain period of time are detected and calculated, and the processing circuit means 4 detects a ratio signal between the peak value and the current change value.

Next, the display means 5 includes a hold means 60, an analog display section 51, a determination means 52, and an indicator 58. According to this configuration, the transient response current of the dielectric substance outputted from the processing means 4 can be generated at any position within a certain period of time. A ratio signal between the peak value and the amount of change is held by the holding means 50, and the value is indicated by an analog meter 51 or the like. Therefore, analog meter 5
The performance of the dielectric material can be grasped from the indicated value of 1.

On the other hand, the output of the processing means 4 or the feed means 50
The output is inputted to the determining means 52, and compared with an arbitrarily set reference value, the result is displayed as an indicator 5 such as a lamp.
Displayed by 8.

The ratio to the amount of change within a certain period of time, i.e. ip/△i
An example of the measurement results is shown below.

From Figure 9, under unused oil and Loootm running, i
p/△i is 2 or less, 5.00. O/v running phase is 3~
5,6.000~B, 7~11°10 for OOOkm driving, and 16 or more for ooo+b driving or more.

It can be seen that iP/Δi is approximately proportional to the distance traveled by the car.

The usage limit of lubricating oil in Figure 9 is approximately 10. OOOk
.

Since it is running, for example, the reference value in the display means 60 judgment means 62 is set to -ip/△i of 6 or less, 6
If you set ~12 to CHECK and 12 or more to NG,
It is possible to accurately determine the contamination state and usage limit of lubricating oil.

Further, in FIG. 9, the voltage source 2 shows a method in which the output of the DC voltage source 20 is converted into a pulse voltage by the switch means 21, but the pulse voltage may be directly generated.

Further, in the processing means 4, the 1 division means 42 uses the peak value ip of the transient response current as the denominator and the amount of change i as the numerator, but it goes without saying that the reverse calculation may be used.

Above, we have described a specific example in which the method and apparatus for evaluating the performance of dielectric materials according to the present invention were applied to lubricating oil for automobiles.1 According to the basic principle of the present invention, dielectric materials can If so, it is possible to accurately grasp its properties, state of contamination, usage limits, etc. Therefore, not only automotive lubricants.

It can be widely applied to fields where lubricating oil is used, such as machine tools, textile machinery, and ships.

This fact makes it possible to accurately evaluate the performance of lubricating oils made from petroleum, etc., which can greatly contribute to society as an indicator for resources.

In addition, although the first to fourth inventions according to the present invention have been described as individual devices, some (selected)

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a photograph showing measurement results according to the present invention, and FIGS. 8 to 9 are methods, apparatuses, and measurements in the first to fourth inventions. It is a line diagram which shows each result. In the figure 1...electrode, 2...power source means. 8... Current detection means, 4... Signal processing means, 6...
・Display means, 40... Peak detection means, 41... Differential calculation means, 42... Division means Patent applicant Toyota Central Research Institute i=M r. 7th Ilsan 3・G-ken → 265-t 7 2 t

Claims (1)

[Claims] 1) A pulse voltage is applied from a power supply means to at least a pair of electrodes facing a dielectric substance to be measured, and a pulse voltage is applied between the electrodes in accordance with the components of the dielectric substance interposed between the electrodes. A method for evaluating the performance of a dielectric material, characterized by measuring a flowing transient response current and evaluating the performance of the dielectric material from the current value. 2) A pulse voltage is applied from a power supply means to at least a pair of electrodes facing the dielectric material to be measured, and a current flowing between the electrodes is detected by a current detection means in accordance with the components of the dielectric material interposed between the electrodes. performance evaluation of a dielectric material, characterized in that the change in the current is measured by a processing means, and the performance of the dielectric material is evaluated from the transient response characteristics of the dielectric material when the pulse voltage is applied. Method. 8) Measurement of current change by the processing means. A peak value of a current value at an arbitrary position of a current flowing between the electrodes due to a transient response of the dielectric material. The method is characterized in that the determination is performed using at least one of the amount of change in current within a certain time at the arbitrary position and the ratio obtained by dividing the peak value and the amount of change in current after a certain period of time has elapsed from the peak value. Patent evaluation method. 4) The method for evaluating the performance of a dielectric material according to claim 8, wherein the voltage applied to the electrode by the power supply means generates a pulse voltage of a constant amplitude and a constant time duration. 5) At least one pair of electrodes facing the dielectric material to be measured. power supply means for applying a pulse voltage to the electrode;
and means for measuring a transient response current flowing between the electrodes corresponding to the components of the dielectric material interposed between the electrodes, and the performance of the dielectric material is evaluated from the measured current value. Performance evaluation device for dielectric materials. 6) at least one pair of electrodes facing the dielectric material to be measured; and power supply means for applying a pulse voltage to the electrode. current detection means for detecting a current flowing between the electrodes in accordance with a component of a dielectric substance interposed between the electrodes; and processing means for measuring changes in the current. A performance evaluation device for a dielectric material, characterized in that the performance of the dielectric material is evaluated from the transient response characteristics of the dielectric material when the pulse voltage is applied. 7) The processing means is a peak detection means for measuring the peak value of the current flowing between the electrodes at an arbitrary position based on the transient response of the dielectric material. Performance evaluation device for dielectric materials. 8) The processing means is characterized by comprising a peak detection means and a differential calculation means for measuring the amount of change in the current flowing between the electrodes at an arbitrary position within a certain period of time due to the transient response of the dielectric material. A performance evaluation device for a dielectric material according to claim 6. 9) The processing means is configured to: by a transient response of the dielectric material. The peak value of the current flowing between the electrodes at an arbitrary position is divided by the amount of change in the current after a certain period of time has elapsed from the peak value, and the ratio between the peak value and the amount of change is calculated. 7. A performance evaluation device for a dielectric material according to claim 6, comprising a peak detection means, a differential calculation means, and a division calculation means. 10) The power source means. 10. The device for evaluating the performance of a dielectric material according to claim 8, characterized in that it has a function of generating a pulse voltage of a constant amplitude and a constant time width.