JP2024010352A - Vehicle analyzer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle analyzer with which it is possible to analyze the electrical action of vehicle bodies.

SOLUTION: Provided is a vehicle analyzer that is charged with static electricity due to external causes including the traveling of a vehicle body 1 that is held in the state of being insulated against road surfaces. The analyzer comprises a power supply 6 that applies a voltage between a first prescribed region 3 of the vehicle body 1 and a second prescribed region 4 of the vehicle body 1, a detection unit 7 that detects a current value flowing between the first prescribed region 3 and the second prescribed region 4, and an arithmetic unit 10 that determines impedance or admittance between the first prescribed region 3 and the second prescribed region 4, on the basis of the voltage value applied from the power supply 6 and the current value detected by the detection unit 7.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an apparatus for analyzing the electrical effects of a vehicle body including exterior parts of the vehicle.

Patent Document 1 describes a vehicle control device that is configured to match an occupant's bodily sensation through a steering wheel with the actual behavior of the vehicle. This vehicle is equipped with a so-called steer-by-wire mechanism in which the steering wheel and steered wheels are mechanically separated, and the steer-by-wire mechanism applies a reaction force to the steering wheel according to the amount of operation of the steering wheel. It is equipped with a power motor and a steering motor that steers the steered wheels according to the amount of steering operation. The control device calculates a target lateral acceleration of the vehicle based on the vehicle speed and the steering angle, and calculates a target turning angle based on the target lateral acceleration and a steering wheel that calculates the steering reaction force divided by the amount of steering operation. It is configured to determine the rigidity.

JP 2019-172157 Publication

The control device described in Patent Document 1 determines a target lateral acceleration according to the driver's steering operation, and calculates the target lateral acceleration in order to match the turning performance experienced by the driver with the actual behavior of the vehicle. The reaction force applied to the steering wheel and the turning angle of the steered wheels are controlled based on this. However, since the wheels of conventionally known vehicles are made of materials with low electrical conductivity, static electricity generated by friction between the wheels and the road surface charges the vehicle body, creating a repulsive force between the wheels and the air ions. As a result, the aerodynamic characteristics of the vehicle may differ from the intended characteristics, resulting in a reduction in driving performance. That is, running stability performance, acceleration performance, etc. may change due to the electrical effects of the vehicle body. The electrical effects of the car body, such as the presence or absence of static electricity, were determined through sensory tests, which may increase the number of design steps, and there is still room to develop a device to analyze the electrical effects of the car body. was there.

The present invention has been made in view of the above-mentioned technical problem, and an object of the present invention is to provide a vehicle analysis device that can analyze the electrical effects of a vehicle body.

In order to achieve the above object, the present invention is an analysis device for a vehicle in which a vehicle body, which is kept insulated from the road surface, is charged with static electricity due to external factors including driving. a power source that applies a voltage between a first predetermined portion and a second predetermined portion of the vehicle body; a detection unit that detects a current value flowing between the first predetermined portion and the second predetermined portion; and the power source. and a calculation unit that calculates impedance or admittance between the first predetermined part and the second predetermined part based on the voltage value applied from the detector and the current value detected by the detection part. There is.

In the present invention, the detection unit detects a current value flowing between the first predetermined portion and the second predetermined portion multiple times, and the calculation unit detects the current value flowing between the first predetermined portion and the second predetermined portion, and the calculation portion detects the current value flowing between the first predetermined portion and the second predetermined portion. The apparatus may further include an analysis unit that calculates the impedance or admittance based on the calculation unit and performs statistical processing on the plurality of impedances or admittances calculated by the calculation unit to extract the impedance or admittance.

In the present invention, the analysis unit may be configured to extract the impedance or admittance by subjecting the plurality of impedances or admittances to root mean square processing.

In the present invention, the analysis section processes the plurality of impedances or admittances obtained by the calculation section in a state where the vehicle body is charged with static electricity, and performs cumulative frequency distribution processing on the plurality of impedances or admittances determined by the calculation section when the vehicle body is charged with static electricity. The plurality of impedances or admittances obtained by the calculation unit in a state different from the current state may be compared.

In the present invention, the power source may be configured to apply a DC voltage in a predetermined direction between the first predetermined portion and the second predetermined portion.

In the present invention, the power source includes an AC power source that applies an AC voltage between the first predetermined portion and the second predetermined portion, and converts the output voltage of the AC power source into a positive or negative DC voltage. The control unit may further include a control unit that applies an electric current between the first predetermined portion and the second predetermined portion.

In the present invention, the power source is configured to apply an AC voltage between the first predetermined portion and the second predetermined portion while continuously changing the frequency, and the detection unit is configured to apply an alternating voltage between the first predetermined portion and the second predetermined portion. A current value flowing between a predetermined portion and the second predetermined portion is detected multiple times, and the calculation unit calculates the impedance or the admittance based on each of the current values detected multiple times, and calculates the impedance or the admittance based on each of the current values detected multiple times. an averaging device that averages impedance or admittance, and extracts the impedance or admittance at each predetermined quantile for each frequency, and extracts the impedance or admittance averaged by the averaging device and the predetermined value. The apparatus may further include an equivalent circuit analysis device that obtains a frequency characteristic based on the impedance or the admittance of the quantile point, and constructs an equivalent circuit based on the frequency characteristic.

In the present invention, the power source may include a current source and an electrical resistance member.

In the present invention, the power source is configured to apply an alternating current voltage between the first predetermined portion and the second predetermined portion while continuously changing the frequency, and the calculation unit is configured to apply an alternating current voltage between the first predetermined portion and the second predetermined portion, and The impedance at a predetermined analysis frequency among the voltage frequencies may be determined.

In the present invention, the power source may further include a switching device that is mounted on the vehicle and switches the ground of the power source.

According to the present invention, the impedance or admittance between a first predetermined portion and a second predetermined portion of the vehicle body is determined in a vehicle that is charged with static electricity due to external factors including driving. By determining the impedance and admittance of the vehicle body in this way, the electrical effects of the vehicle body can be analyzed. Therefore, for example, it can be used as data for a sensory test to determine the influence of static electricity on driving performance, to determine whether or not to operate a device to remove static electricity, or to determine whether or not to operate a device to remove static electricity. A voltage can be appropriately applied to suppress the deterioration of driving performance due to charging.

FIG. 1 is a schematic diagram for explaining an example of a vehicle analysis device according to an embodiment of the present invention. FIG. 6 is a diagram showing a cumulative frequency distribution comparing impedance between a measured value (ion addition) and a reference value (normal time). FIG. 2 is a schematic diagram showing an example in which a power source is configured by a current source and an electrical resistance member. FIG. 2 is a schematic diagram showing an example in which a measuring device and an analysis device are mounted on a vehicle. It is a figure which shows the cumulative frequency distribution which compares the impedance of a measured value (PTFE pasting) and a reference value (normal time). It is a schematic diagram which shows the example provided with the switching device which switches the ground of a measuring device. It is a schematic diagram which shows the example provided with the control part which applies DC bias between a 3rd predetermined part and a 4th predetermined part. FIG. 2 is a schematic diagram showing an example including an equivalent circuit analysis device that constructs an equivalent circuit based on measured impedance.

The present invention will be described based on embodiments shown in the drawings. Note that the embodiments described below are merely examples of embodying the present invention, and are not intended to limit the present invention.

FIG. 1 shows a schematic diagram for explaining an example of a vehicle analysis device according to an embodiment of the present invention. The vehicle Ve shown in FIG. 1 has a vehicle body 1, which includes frame members such as a front bumper and window frame, exterior members such as a windshield and side windows that receive wind while the vehicle is being driven, supported by tires 2, as in conventional vehicles. . Furthermore, the tires 2 are made of an insulator (or a material with low electrical conductivity) such as rubber, as in conventional vehicles. In other words, the vehicle body 1 is kept insulated from the road surface.

In the vehicle Ve configured in this manner, static electricity is generated due to the electrical action accompanying the friction between the surface of the vehicle body 1 and the running wind, air flow flowing in the intake and exhaust pipes, and the like. Static electricity is also generated by the electrical action of a power source such as an engine or motor, a transmission, a suspension, or the like. Furthermore, static electricity is also generated due to electrical effects such as when the tire 2 rotates and the surface that was in contact with the road surface separates from the road surface. As described above, since the vehicle body 1 is supported by the tires 2 having low electrical conductivity, the vehicle body 1 is charged with static electricity due to external factors including the above-mentioned driving.

When the vehicle body 1 is charged with static electricity, a repulsive force acts between the static electricity and air ions included in the air flow along the exterior member of the vehicle Ve. Since the repulsive force acts in a direction that separates the airflow from the vehicle Ve, it is not possible to obtain the intended aerodynamic characteristics in the portions of the vehicle body 1 that are formed to allow the airflow to flow, and the vehicle Ve Driving performance may deteriorate.

The present inventors verified whether, when the vehicle body 1 is charged with static electricity as described above, there is a change in the electrical action of the portion charged with static electricity. The verification conditions will be explained with reference to FIG. In the example shown in FIG. 1, the impedance between the left front window (hereinafter referred to as the first predetermined portion) 3 and the grounding point between the left front wheel 2 and the road surface (hereinafter referred to as the second predetermined portion) 4 is We verified whether there were any changes. Therefore, in the example shown in FIG. 1, a measuring device 5 for measuring the impedance between the first predetermined region 3 and the second predetermined region 4 is provided. This measuring device 5 detects a power source 6 that applies voltage between the first predetermined portion 3 and the second predetermined portion 4, and a current value flowing between the first predetermined portion 3 and the second predetermined portion 4. and an ammeter 7. This ammeter 7 corresponds to the "detection section" in the embodiment of the present invention. In the example shown in FIG. 1, the measuring device 5 is provided outside the vehicle.

The power source 6 described above is configured to control the voltage applied to the first predetermined portion 3 and the second predetermined portion 4 with reference to the ground 8 . The power source 6 may be an AC power source that applies an AC voltage to the first predetermined portion 3 and the second predetermined portion 4, or a DC power source that applies a DC voltage to the first predetermined portion 3 and the second predetermined portion 4. It may be a power source. Further, when the power source 6 is an AC power source, the frequency of the applied voltage may be continuously changed.

An analysis device 9 is connected to the measuring device 5 described above. This analysis device 9 is composed of an electronic control device mainly composed of a microcomputer. This analysis device 9 includes a calculation unit 10 that calculates the impedance between the first predetermined portion 3 and the second predetermined portion 4 based on the current value detected by the ammeter 7. That is, the calculation unit 10 is configured to calculate impedance by dividing the output voltage of the power source 6 by the current value detected by the ammeter 7. This calculation unit 10 may be configured to calculate admittance instead of impedance. Note that in the following description, it is assumed that the calculation unit 10 calculates impedance.

Furthermore, since electromagnetic noise from equipment mounted on the vehicle Ve or from outside the vehicle may affect the measured value (current value), the analysis device 9 statistically processes the impedance calculated by the calculation unit 10. It further includes an analysis section 11 for extracting features from the calculated impedance.

To give a specific example, the current value between the first predetermined portion 3 and the second predetermined portion 4 is detected multiple times, and a plurality of impedances are calculated based on each of the detected current values. Then, the plurality of impedances obtained by the calculation unit 10 are subjected to root mean square processing. By performing root-mean-square processing on a plurality of impedances obtained by the arithmetic unit 10 in this way, even if electromagnetic noise or the like is acting on the ammeter 7, the actual impedance value and the electromagnetic noise or the like can be calculated. Since the difference from the value including external factors appears large, the impedance value can be extracted. In particular, by extracting impedances greater than the third quartile (75% quantile) of multiple impedances and performing root mean square processing, the influence of external factors such as electromagnetic noise can be reduced. Impedance can be found.

Furthermore, the analysis unit 11 may be configured to determine whether the impedance tends to increase or decrease with respect to a predetermined reference value. For example, if the impedance measured without installing a conventional static eliminator such as a self-discharge static eliminator or ionizer to eliminate static electricity is used as the reference value, then the impedance measured with the above static eliminator installed will increase compared to the reference value. It may be configured to determine whether it is a trend or a decreasing trend. Specifically, the impedance measured without a static eliminator is subjected to cumulative frequency distribution processing, and the impedance measured with a static eliminator provided, that is, in a state different from the state in which the reference value was measured, is subjected to cumulative frequency distribution processing, Their distributions may also be compared. By performing distribution processing and comparing in this way, it is possible to determine changes in impedance even if the values include external factors such as electromagnetic noise.

Note that when the power source 6 is an AC power source that applies an AC voltage between the first predetermined portion 3 and the second predetermined portion 4, and the frequency of the AC voltage is continuously changed and applied, The impedance may be determined by using a current value at a predetermined analysis frequency among the frequencies of the AC voltage, or the impedance at an analysis frequency among the impedances calculated by the calculation unit 10 may be used. This analysis frequency may be determined to be a frequency for which it has been confirmed that there is a correlation between the running performance evaluation conducted in advance through a sensory test and the magnitude relationship of impedance.

FIG. 2 shows the impedance (hereinafter simply referred to as a reference value) when the vehicle Ve runs without installing a static eliminator, and the negative ions applied to the first predetermined region 3 to eliminate static electricity in the first predetermined region 3. An example is shown in which the impedance (hereinafter simply referred to as a measured value) when driving while spraying is compared. Note that impedance is plotted on the horizontal axis, and cumulative power (or cumulative relative power) is plotted on the vertical axis, with the reference value shown by the symbol "○" and the measured value by the symbol "x".

As shown in FIG. 2, the reference value is larger than the measured value at any quantile. That is, it can be seen that the impedance is reduced by spraying negative ions onto the first predetermined region 3.

Table 1 below shows the results of verifying the running performance when running without the above-mentioned static eliminator (normal time) and when negative ions were sprayed onto the vehicle body 1 (ion addition).

As shown in Table 1, it was felt that the sway and vibration of the vehicle Ve were reduced when the vehicle Ve was running while spraying negative ions with an ionizer. In addition, at the 5% quantile in that case, the reference value is 0.36GΩ, whereas the actual measured value is 0.26GΩ, and at the 25% quantile, the reference value is 0.52GΩ. On the other hand, the actual measured value was 0.39 GΩ. That is, it can be seen that there is a correlation between impedance and driving performance.

As described above, there is a correlation between the impedance of the vehicle body 1 and the driving performance, so by detecting the impedance of the vehicle body 1, data that can be used in a sensory test for determining the driving performance can be collected. Therefore, at the design stage of the vehicle Ve, a device for eliminating static electricity is installed at each location on the vehicle body 1, and the static electricity eliminating device is capable of improving driving performance by charging the vehicle body 1 with static electricity and measuring the impedance. The installation location can be specified in advance.

Further, by performing cumulative frequency distribution processing and comparing the reference value and the measured value, even if the measured value includes electromagnetic noise, the reference value and the measured value can be compared as a distribution. That is, it is possible to determine whether the running performance of the vehicle Ve is good or bad without providing processing or equipment for comparing the reference value and the measured value, such as removing electromagnetic noise such as random frequencies. Furthermore, even if the difference between the reference value and the measured value is small, if the reference value and the measured value are each subjected to root-mean-square processing and compared, the difference can be properly determined. It is possible to judge whether the driving performance of the vehicle is good or bad.

The power source in the embodiment of the present invention is not limited to a voltage source whose output voltage can be controlled, but may be a current source whose output current can be controlled. Specifically, as shown in FIG. 3, a current source 12 and an electrical resistance member 13 having a predetermined resistance value may be connected to each other. When configured in this way, by controlling the output current of the current source 12, the voltage output from the power source 6 configured by the current source 12 and the electrical resistance member 13 can be controlled. Therefore, similarly to the configuration shown in FIG. The value of the flowing current can be measured with an ammeter 7.

The vehicle analysis device according to the embodiment of the present invention may include the measuring device 5 and the analysis device 9 inside the vehicle. FIG. 4 shows a schematic diagram for explaining an example thereof. In the example shown in FIG. 4, the measuring device 5 measures the area between the inside of the left front window (hereinafter referred to as the third predetermined part) 14 and the outside of the left front window (hereinafter referred to as the fourth predetermined part) 15. It is configured to measure a current value. In this case, the power source 6 may be a portable power source mounted on the vehicle, an auxiliary battery of the vehicle Ve, or the like. Further, the analysis device 9 configured similarly to the example shown in FIG. 1 may also be mounted on the vehicle Ve, and may be incorporated into, for example, an ECU that controls the driving force of the vehicle Ve. Note that the basic configurations of the measuring device 5 and the analyzing device 9 are the same as those shown in FIG. It has been omitted.

Figure 5 shows the impedance (measured value) when driving with polytetrafluoroethylene (hereinafter referred to as PTFE) tape as a self-discharge static eliminator attached to the side window, and when driving without attaching the PTFE tape. , that is, an example in which the impedance (reference value) when the vehicle body 1 is charged is compared. Note that impedance is plotted on the horizontal axis, and cumulative power (or cumulative relative power) is plotted on the vertical axis, with the reference value shown by the symbol "○" and the measured value by the symbol "x".

As shown in FIG. 5, the reference value is larger than the measured value at any quantile. That is, it can be seen that the impedance is reduced by attaching the PTFE tape to the side window.

Table 2 below shows the results of verifying the driving performance when no PTFE tape is attached to the side window (normal time) and when PTFE tape is attached to the side window (PTFE pasted).

As shown in Table 2, when the PTFE tape was attached to the side window, it was felt that the wobbling and vibration of the vehicle Ve during driving were reduced. In addition, at the 5% quantile in that case, the reference value is 2.4 GΩ, whereas the actual measured value is 2.1 GΩ, and at the 25% quantile, the reference value is 3.4 GΩ. On the other hand, the actual measured value was 3.1 GΩ. That is, it can be seen that there is a correlation between impedance and driving performance.

As described above, even when the measuring device 5 and the analyzing device 9 are mounted on the vehicle Ve, there is a correlation between the measured impedance and the driving performance. Therefore, similarly to the case where the measuring device 5 and the analyzing device 9 are provided outside the vehicle, by detecting the impedance of the vehicle body 1, data that can be used in a sensory test for determining driving performance can be obtained. Therefore, for example, if the device is equipped with an ionizer that sprays ions of the opposite polarity to static electricity as described above, the static eliminator may be activated by detecting impedance while driving and activating the ionizer when the impedance increases. It is possible to judge whether or not it is necessary.

On the other hand, when the measuring device 5 is mounted on the vehicle Ve as shown in FIG. A voltage will be applied between. On the other hand, in the vehicle Ve, voltage and the like are normally controlled using the body as the ground, so it is assumed that the measuring device 5 is similarly driven using the body as the ground. Therefore, a voltage is applied to the body serving as the ground of the measuring device 5, and the measuring system may become unstable. Therefore, as shown in FIG. 6, when one point between two points where the current value is measured by the measuring device 5 and the ground of the measuring device 5 are the same, a switching device 16 is further provided to switch the ground of the measuring device 5. You can leave it there. An example of an object to be switched by the switching device 16 may be a cord that is connected to the ground provided in a conventional vehicle. Note that the switching device 16 described above may be configured, for example, to separate the ground of the measuring device 5 from the body without connecting it to other parts of the body.

By switching the ground of the measuring device 5 in this manner, it is possible to suppress variations in detected values due to instability of the measuring system.

Further, as described above, the vehicle analysis device according to the embodiment of the present invention is configured to apply a voltage to the vehicle body 1 including the exterior member. The material selection and configuration of the exterior components are not determined with the assumption that they will be energized, so they may include parts (nonlinear elements) whose electrical resistance changes depending on the direction in which the current flows. There is a possibility that there are. On the other hand, by applying a negative charge to a predetermined portion of the vehicle body 1, it is possible to reduce the repulsive force generated between the portion and the air flow. Therefore, by determining whether or not the above-mentioned nonlinear element is included, it is possible to specify the direction of the current to be applied to apply electric charge to the vehicle body 1. Therefore, the vehicle analysis device according to the embodiment of the present invention is configured to be able to determine whether a nonlinear element is included by measuring the impedance between two predetermined points.

An example is shown in FIG. The example shown in FIG. 7 is configured based on the example shown in FIG. 4, and a control unit 17 is connected to the measuring device 5. The control unit 17 converts the voltage output from the power supply 6 into a positive DC voltage or a negative DC voltage, and applies a DC bias to the third predetermined portion 14 and the fourth predetermined portion 15. It is configured so that it can be done. This control section 17 can be configured in the same manner as a conventional DC bias configuration.

As described above, by applying a DC bias of either positive or negative polarity between the two predetermined portions 14 and 15, and determining the impedance by detecting the current value of the ammeter 7 at that time, the nonlinear element can be measured. The presence or absence can be determined. Therefore, when applying a negative charge to improve running performance, the direction of the current can be specified, and running performance can be efficiently improved. Note that if the power source 6 is a DC power source that applies a DC voltage, the control section 17 described above may not be provided.

In addition, as described above, when applying a negative charge to a predetermined portion of the vehicle body 1 to improve driving performance, an equivalent circuit that approximates the electrical action of the vehicle body 1 is constructed in order to determine the voltage to be applied. It is preferable to form. Therefore, the vehicle analysis device according to the embodiment of the present invention is configured to be able to construct an equivalent circuit based on the measured impedance. A schematic diagram for explaining the configuration is shown in FIG. The example shown in FIG. 8 is based on the example shown in FIG. 4, and the analysis device 9 includes an averaging device 18 and an equivalent circuit analysis device 19.

Specifically, the power source 6 is configured to apply an AC voltage between the third predetermined portion 14 and the fourth predetermined portion by continuously changing the frequency, and the ammeter 7 is configured to apply an alternating current voltage between the third predetermined portion 14 and the fourth predetermined portion. It is configured to detect a current value that is an output of an alternating current voltage multiple times. Then, the calculation unit 10 calculates impedance based on each of the current values detected a plurality of times. That is, impedance is determined each time a current value is detected, and a plurality of impedance values are determined.

The averaging device 18 is configured to average the plurality of impedance values obtained by the calculation unit 10. Further, the equivalent circuit analysis device 19 is configured to extract the impedance at each predetermined quantile (for example, the 75% quantile) for each frequency. Furthermore, the equivalent circuit analyzer 19 calculates frequency characteristics using the values of the impedance for each frequency extracted as described above and the impedance averaged by the averaging device 18, and based on the frequency characteristics. It is configured to construct an equivalent circuit using The means for constructing an equivalent circuit based on this frequency characteristic can be performed by various conventionally known methods.

By detecting the impedance between the two predetermined parts 14 and 15 as described above, the frequency characteristics of that part can be determined, and as a result, the electrical action of the vehicle body 1 can be determined as an equivalent circuit. . Therefore, when applying a negative charge to a predetermined part of the vehicle body 1 to improve driving performance, the applied voltage can be controlled to match the voltage value for improving driving performance, and as a result, driving performance can be controlled to match the voltage value for improving driving performance. Performance can be improved.

1 Vehicle body 2 Tires (front left wheel)
3 First predetermined portion 4 Second predetermined portion 5 Measuring device 6 Power source 7 Ammeter 8 Earth 9 Analysis device 10 Arithmetic unit 11 Analysis portion 12 Current source 13 Electrical resistance member 14 Third predetermined portion 15 Fourth predetermined portion 16 Switching device 17 Control unit 18 Averaging device 19 Equivalent circuit analysis device Ve Vehicle

Claims (10)

An analysis device for a vehicle in which the vehicle body, which is kept insulated from the road surface, is charged with static electricity due to external factors including driving,
a power source that applies a voltage between a first predetermined portion of the vehicle body and a second predetermined portion of the vehicle body;
a detection unit that detects a current value flowing between the first predetermined portion and the second predetermined portion;
and a calculation unit that calculates impedance or admittance between the first predetermined portion and the second predetermined portion based on the voltage value applied from the power source and the current value detected by the detection unit. Characteristic vehicle analysis device. The vehicle analysis device according to claim 1,
The detection unit detects a current value flowing between the first predetermined region and the second predetermined region multiple times,
The calculation unit calculates the impedance or the admittance based on each of the current values detected a plurality of times,
A vehicle analysis device comprising: an analysis section that extracts the impedance or admittance by statistically processing the plurality of impedances or admittances determined by the calculation section. The vehicle analysis device according to claim 2,
The analysis device for a vehicle, wherein the analysis unit is configured to extract the impedance or admittance by subjecting the plurality of impedances or admittances to root mean square processing. The vehicle analysis device according to claim 2,
The analysis unit processes the plurality of impedances or admittances obtained by the calculation unit in a state in which the vehicle body is charged with static electricity, and performs a cumulative frequency distribution process on the plurality of impedances or admittances, which is different from the state in which the vehicle body is charged with static electricity. A vehicle analysis device characterized in that the vehicle analysis device is configured to compare the plurality of impedances or admittances obtained by the calculation unit in the state. The vehicle analysis device according to claim 1,
A vehicle analysis device, wherein the power source is configured to apply a DC voltage in a predetermined direction between the first predetermined portion and the second predetermined portion. The vehicle analysis device according to claim 1,
The power source includes an AC power source that applies an AC voltage between the first predetermined portion and the second predetermined portion,
A vehicle analysis device comprising: a control unit that converts the output voltage of the AC power source into a positive or negative DC voltage and applies the converted voltage between the first predetermined portion and the second predetermined portion. . The vehicle analysis device according to claim 1,
The power source is configured to apply an alternating current voltage between the first predetermined portion and the second predetermined portion while continuously changing the frequency;
The detection unit detects a current value flowing between the first predetermined region and the second predetermined region multiple times,
The calculation unit calculates the impedance or the admittance based on each of the current values detected a plurality of times,
an averaging device that averages the plurality of impedances or admittances;
extracting the impedance or admittance at each predetermined quantile for each frequency, and based on the impedance or admittance averaged by the averaging device and the impedance or admittance at the predetermined quantile; A vehicle analysis device further comprising: an equivalent circuit analysis device that obtains frequency characteristics and constructs an equivalent circuit based on the frequency characteristics. The vehicle analysis device according to claim 1,
A vehicle analysis device, wherein the power source includes a current source and an electrical resistance member. The vehicle analysis device according to claim 1,
The power source is configured to apply an alternating current voltage between the first predetermined portion and the second predetermined portion with a frequency that is continuously changed;
A vehicle analysis device, wherein the calculation unit calculates the impedance at a predetermined analysis frequency among the frequencies of the AC voltage. The vehicle analysis device according to claim 1,
The power source is mounted on the vehicle,
A vehicle analysis device further comprising a switching device for switching the ground of the power source.

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