JP7496609B2 - Sensor system, child tag and information processing program - Google Patents

Description

The present invention relates to a sensor system capable of calculating the operating status of a target machine such as a molding machine, a press machine, or a die-casting machine, and a child tag and an information processing program included in the sensor system.

To improve productivity in a manufacturing plant, it is important to know the operating hours of the machines in the plant. The operating rate of the machines in the plant is an indicator of productivity improvement and also serves as a criterion when accepting orders. For this reason, many companies manage the operating rate of the machines in their plants.

The typical method for calculating operation rates is to use a spreadsheet program to tally up the production time recorded in daily work reports and other documents. This method requires a significant amount of labor and can lead to transcription errors and tally errors from paper documents, so there is a high demand for automatic tallying.

JP 2019-46293 A

Tokai Soft Co., Ltd., "Operation Monitoring Web System Flex Signal 5", [online], [Searched on August 27, 2013], Internet <URL: https://www.tokai-soft.co.jp/business/bu_13/fs/index.html>

To achieve automatic tallying, efforts are being made to automatically grasp the operating status of various machines, such as installing operation counters, acquiring data from machine control panels, and acquiring operating/non-operating data from signal lights (Non-Patent Document 1). Meanwhile, manufacturing plants contain a variety of machines. For this reason, in order to grasp the operating rates of all machines, a wide variety of devices for grasping the operating rates are required, and including the installation work, it is very expensive. In addition, in order to obtain the operating rates of old machines, it is also costly to modify the old machines themselves.

In view of the above circumstances, the object of the present invention is to provide a sensor system for calculating the operating rates of various machines in a factory using simple equipment and at low cost.

A sensor system according to one aspect of the present invention includes:
A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
a determination unit that detects characteristic points of the vibration or acceleration, calculates an interval time between adjacent characteristic points, determines an operation mode based on a difference between the adjacent interval times, determines a change point indicating a time point at which the operation mode changes, and outputs the operation mode and the change point via the wireless communication interface;
and a child tag having
an information processing device having a calculation unit that calculates an operating rate of the target machine based on the operation mode and the change point output by the child tag;
Equipped with:

According to this embodiment, the child tag determines the operating mode based on the vibration or acceleration of the target machine detected by the sensor. Therefore, the operating mode of the target machine can be determined and the availability rate of the target machine can be calculated using simple equipment (sensors) at low cost. Therefore, the child tag can be made small and lightweight enough to be attached to the target machine.

The determination unit determines the operation mode as follows:
When the difference between adjacent interval times is equal to or greater than a threshold value, it is determined that the vehicle is in a non-automated driving mode.
When the difference between adjacent interval times is less than the threshold value, it is determined that the vehicle is in an automatic driving mode,
When the length of the interval time is equal to or longer than a predetermined length, it is determined that the mode is the stop mode.

In this way, by determining the operation mode based on the interval time of characteristic points of vibration or acceleration, it is possible to accurately determine the operation mode of a target machine that is expected to operate automatically periodically.

The non-automated operation modes include a setup mode, a prototype mode, and an idling mode.

In this way, by distinguishing non-automatic operation modes, including setup mode, prototype mode, and idling mode, from automatic operation modes, it is possible to accurately calculate the availability rate of the target machine.

The determination unit outputs the operation mode and the change point at the timing when the change point is determined.

In this way, the child tag does not always output the operating mode, but only outputs the operating mode and the change point when it determines that a change point has occurred. This minimizes the number of times the child tag outputs the operating mode and the change point.

The calculation unit calculates the duration of the operation mode based on the operation mode and the change point output by the child tag, and calculates the availability rate of the target machine based on the duration.

In this way, the duration of the operating mode is calculated by calculating the time from one change point to the next. This eliminates the need to constantly monitor the operation of the target machine, making it possible to calculate the duration of the target machine's operating mode accurately and with low load.

The calculation unit calculates the ratio of the duration of the autonomous driving mode to a unit time as the operation rate.

This allows the availability rate of the target machine to be calculated accurately by calculating the percentage of time the machine is in automatic operation mode.

A parent tag that receives the operating mode and change points output by the child tag and transfers them to the information processing device.

By having the parent tag between the child tag and the information processing device, the parent tag can store the operating mode and change points received from the child tag as necessary and transfer them to the information processing device.

A plurality of the child tags can be connected to the parent tag,
The calculation unit calculates the operation rates of the target machines, respectively, based on the operation modes and the change points output by the child tags.

By attaching child tags to multiple target devices, one parent tag can send communications from multiple child tags to an information processing device, eliminating the need to install expensive equipment on each of the multiple target devices, allowing for a simple and inexpensive sensor system.

The target machine is a molding machine, a press machine, or a die-casting machine.

This makes it possible to accurately determine the operating mode of the target machine (molding machine, press machine, or die-casting machine) that is expected to operate automatically periodically.

A child tag according to one embodiment of the present invention is
A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
a determination unit that detects characteristic points of the vibration or acceleration, calculates an interval time between adjacent characteristic points, determines an operation mode based on a difference between the adjacent interval times, determines a change point indicating a time point at which the operation mode changes, and outputs the operation mode and the change point via the wireless communication interface;
Equipped with:

An information processing program according to an embodiment of the present invention includes:
A control circuit of the information processing device,
A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
a determination unit that detects characteristic points of the vibration or acceleration, calculates an interval time between adjacent characteristic points, determines an operation mode based on a difference between the adjacent interval times, determines a change point indicating a time point at which the operation mode changes, and outputs the operation mode and the change point via the wireless communication interface;
The target machine is operated as a calculation unit that calculates the availability rate of the target machine based on the operation mode and the change point output by a child tag having the above-mentioned function.

The present invention makes it possible to calculate the operating rates of various machines in a factory using simple equipment and at low cost.

The effects described here are not necessarily limited to those described herein, and may be any of the effects described in the present invention.

1 shows an overview of a sensor system according to an embodiment of the present invention. 2 shows the functional configuration of the sensor system. The operation flow of the child tag is shown below. 1 shows a schematic diagram of a vibration or acceleration waveform. 3 shows an operation flow of the information processing device.

The following describes an embodiment of the present invention with reference to the drawings.

1. Overview of the sensor system

Figure 1 shows an overview of a sensor system according to one embodiment of the present invention.

The sensor system 1 has multiple child tags 10, one parent tag 20, and an information processing device 30.

A plurality of (e.g., several tens of) child tags 10 are typically installed in a plurality of (e.g., several tens of) target machines 40 installed at the same site (such as a manufacturing plant). The target machine 40 is a machine that vibrates during operation, such as a molding machine, a press machine, or a die-casting machine. The child tag 10 incorporates a sensor 11 (FIG. 2) and can detect vibration or acceleration during operation of the target machine 40. The sensor 11 is attached to the movable mold of the target machine 40. The sensor 11 is a vibration sensor and/or an acceleration sensor. The child tag 10 may be small and lightweight enough to be attached to the movable mold of the target machine 40 (e.g., fitted into a mounting jig adhered to the target machine 40). The child tag 10 incorporates a battery (not shown). Each of the plurality of child tags 10 is connected to the parent tag 20 so as to be capable of wireless communication. The wireless communication may be, for example, network communication via a wireless LAN.

The parent tag 20 is connected to multiple child tags 10 for example via a network N so as to be able to communicate wirelessly, and is further connected to an information processing device 30 for example via a USB so as to be able to communicate. The parent tag 20 transfers data received from the multiple child tags 10 to the information processing device 30. The parent tag 20 may be the shape and size of a USB flash drive.

The information processing device 30 receives data output by the multiple child tags 10 from the parent tag 20. Based on the data output by the multiple child tags 10, the information processing device 30 calculates the operating rates of the multiple target machines 40 in which the multiple child tags 10 are respectively installed. The information processing device 30 is a general-purpose personal computer or a dedicated computer. If the information processing device 30 is a general-purpose personal computer, the information processing program that realizes the sensor system of this embodiment may be recorded on a portable, non-transient computer-readable recording medium or downloaded via the Internet or the like, and then installed on the general-purpose personal computer. If the information processing device 30 is a dedicated computer, a dedicated computer (stationary, mobile, etc.) on which the information processing program that realizes the sensor system of this embodiment is installed may be shipped.

2. Functional configuration of the sensor system

Figure 2 shows the functional configuration of the sensor system.

Unless otherwise specified, the following describes a single child tag 10. The child tag 10 has a sensor 11, a control circuit 12, and a wireless communication interface 13. In the control circuit 12, the CPU operates as a determination unit 100 by loading an information processing program recorded in the ROM into the RAM and executing it.

The parent tag 20 has hardware and software (not shown) for non-volatilely storing data received from the child tag 10 via wireless communication as necessary (e.g., when the information processing device 30 is powered off) and transferring the data to the information processing device 30 via USB communication.

The information processing device 30 has a USB interface 31, a control circuit 32, an output device 33 (display, speaker, etc.), and a large-capacity non-volatile storage device 34 such as an HDD or SSD. In the control circuit 32, the CPU operates as a calculation unit 300 by loading an information processing program recorded in the ROM into the RAM and executing it. The storage device 34 stores a child tag table 310.

The child tag table 310 stores a child tag ID 311 and a target machine ID 312 in association with each other. The child tag ID 311 identifies each of the multiple child tags 10 communicatively connected to the parent tag 20 connected to the information processing device 30. The target machine ID 312 identifies the target machine 40 to which the child tag 10 is attached.

3. Child tag operation flow

Figure 3 shows the operation flow of child tags.

As a premise, the process that the child tag 10 is constantly executing will be explained. The sensor 11 constantly detects the vibration or acceleration of the target device 40 to which the child tag 10 is attached, and outputs a detection signal. The detection signal from the sensor 11 is input to the control circuit 12 via an amplifier and an A/D converter (not shown), etc. As a premise, the target device 40 is in a stop mode (no vibration or acceleration) (step S101).

Figure 4 shows a schematic diagram of the vibration or acceleration waveform.

The judgment unit 100 of the control circuit 12 detects a characteristic point of the vibration or acceleration (waveform) (step S101). The characteristic point is typically a rising point where the vibration or acceleration value is greater than a predetermined value. Specifically, the characteristic point corresponds to the vibration or acceleration at the time when the target machine 40 makes a specific movement during operation. For example, if the target machine 40 is a molding machine, the characteristic point corresponds to the time when the mold opening limit is reached or the time when the mold opening starts, and if the target machine 40 is a press machine, the characteristic point corresponds to the time when the bottom dead center is reached or the time when the top dead center is reached. If the judgment unit 100 does not detect a characteristic point of the vibration or acceleration for a predetermined length of time or more, this means that the operating mode of the target machine 40 is a stop mode.

On the other hand, if the judgment unit 100 detects the characteristic point t0 of vibration or acceleration, it means that the target machine 40, which was in the stop mode, has started operating. In this case, the judgment unit 100 judges whether the operation mode of the target machine 40 is an automatic operation mode or a non-automatic operation mode (including a setup mode, a prototype mode, and an idling mode).

When the target machine 40 is in operation, the determination unit 100 detects feature points of vibration or acceleration many times during operation. In this example, the determination unit 100 detects feature points t0, t1, t2, ... in order. When the determination unit 100 detects three consecutive feature points t0 ₁ , t1 ₁ , t2 ₁ (step S102), it calculates the interval time between adjacent feature points. The "interval time between adjacent feature points" means the length of the time interval between two consecutive feature points. In this example, the determination unit 100 calculates the interval time (t1 ₁ -t0 ₁ ) between adjacent feature points t0 ₁ and t1 ₁ , and the interval time (t2 ₁ -t1 ₁ ) between adjacent feature points t1 ₁ and t2 ₁ .

The judgment unit 100 judges whether the adjacent interval times are approximately equal to each other (step S103). In other words, the judgment unit 100 judges whether the adjacent interval times are approximately equal to each other (i.e., the difference is less than the threshold value) or different from each other (i.e., the difference is equal to or greater than the threshold value). This threshold value is a small value that is a level of variation that is acceptable for the target machine 40 to operate normally. When the adjacent interval times are approximately equal to each other (i.e., the difference is less than the threshold value) (step S103, YES), it means that the operation mode of the target machine 40 is an automatic operation mode (the operation of the target machine 40 is periodic). On the other hand, when the adjacent interval times are different from each other (i.e., the difference is equal to or greater than the threshold value) (step S103, NO), it means that the operation mode of the target machine 40 is a non-automatic operation mode (the operation of the target machine 40 is not periodic but irregular). In this example, as shown in (1), the difference between adjacent interval times (t1 ₁ -t0 ₁ ) and (t2 ₁ -t1 ₁ ) is equal to or greater than the threshold value (step S103, NO).

The determination unit 100 determines that the first detected feature point _{t0_1} is a change point indicating the time when the stop mode changed to the non-automatic driving mode. When the determination unit 100 determines the change point, the determination unit 100 transmits the determined operation mode and change point, and a child tag ID for identifying the child tag 10 to the parent tag 20 via the wireless communication interface 13. Specifically, the determination unit 100 transmits an identifier for identifying the operation mode and a time indicating the time of the change point. In this example, the determination unit 100 transmits an identifier indicating the "non-automatic driving mode", a change point _{t0_1} , and a child tag ID for identifying the child tag 10 to the parent tag 20 via the wireless communication interface 13 (step S104). The parent tag 20 receives the identifier indicating the "non-automatic driving mode", a change point _{t0_1} , and a child tag ID for identifying the child tag 10 from the child tag 10, and transfers them to the information processing device 30.

After that, the determination unit 100 continues to detect three consecutive feature points t0, t1, and t2, with the previously detected feature point _t2-1 being the new feature point _t0-2 (step S102). The determination unit 100 continues to determine whether adjacent interval times are substantially equal to each other (step S103). If the state in which adjacent interval times are different from each other (i.e., the difference is equal to or greater than the threshold) continues (step S103, NO), this means that the target machine 40 continues to operate in the non-automated operation mode (step S104).

On the other hand, when adjacent interval times are substantially equal (i.e., the difference is less than the threshold value) (step S103, YES), this means that the operation mode of the target machine 40 has changed to the automatic operation mode. In this example, as shown in (2), the difference between adjacent interval times (t1 ₂ -t0 ₂ ) and (t2 ₂ -t1 ₂ ) is less than the threshold value (step S103, YES).

If the adjacent interval times are substantially equal (that is, the difference is less than the threshold value) (automatic driving mode) (step S103, YES), the determination unit 100 sets this interval time (t1 ₂ -t0 ₂ ) as a reference interval time Δt (step S105).

The judgment unit 100 judges that the characteristic point t0 ₂ (the start point of the interval time (t1 ₂ -t0 ₂ )) is a change point indicating the time when the non-automatic driving mode changed to the automatic driving mode (step S106). At the timing when the judgment unit 100 judges the change point, it transmits an identifier indicating the "automatic driving mode", the change point t0 ₂ , and the child tag ID identifying the child tag 10 to the parent tag 20 via the wireless communication interface 13. The parent tag 20 receives the identifier indicating the "automatic driving mode", the change point t0 ₂ , and the child tag ID identifying the child tag 10 from the child tag 10, and transfers them to the information processing device 30.

During the autonomous driving mode, the determination unit 100 continues to detect feature points at the time when the reference interval time Δt has elapsed since the last detected feature point t3, as shown in (3) (step S107, YES). In other words, during the autonomous driving mode, the determination unit 100 continues to detect the feature point t3, and the state in which the adjacent interval times are substantially equal (substantially equal to the reference interval time Δt) continues (step S107, NO). In this example, the determination unit 100 detects feature points t3 ₁ , t3 ₂ , t3 ₃ ... at each reference interval time Δt, as shown in (3) (step S107, YES). In other words, the determination unit 100 determines that the difference (Δt3 ₂ - Δt3 ₁ ) between adjacent interval times Δt3 ₁ and Δt3 ₂ is less than the threshold value, and the difference (Δt3 ₃ - Δt3 ₂ ) between Δt3 ₂ and Δt3 ₃ is less than the threshold value (step S107, YES). Therefore, the determination unit 100 determines that the target machine 40 continues in the automatic driving mode at the feature points t3 ₁ , t3 ₂ , and t3 ₃ .

On the other hand, when the determination unit 100 does not detect a feature point at a time when the reference interval time Δt has elapsed from the feature point t3 detected immediately before (step S107, NO), and does not detect a feature point of vibration or acceleration for a predetermined time length or more, it means that the operation mode of the target machine 40 has changed to the stop mode (step S101). The "predetermined time length" is a time sufficiently longer than the interval time of the non-automatic driving mode. In this example, the determination unit 100 does not detect a feature point at time t3 ₄ of "feature point t3 ₃ + reference interval time Δt" (dashed line in FIG. 4), and does not detect a feature point of vibration or acceleration for a predetermined time length or more. In this case, it means that the operation mode of the target machine 40 has changed to the stop mode (step S101). The determination unit determines that time t3 ₄ of "feature point t3 ₃ + reference interval time Δt" is a change point indicating the time when the automatic driving mode changed to the stop mode. At the timing when the determination unit 100 determines the change point, it transmits an identifier indicating the "stop mode", the change point t3 ( ₄ ), and the child tag ID for identifying the child tag 10 to the parent tag 20 via the wireless communication interface 13. The parent tag 20 receives the identifier indicating the "stop mode", the change point t3 ( ₄ ), and the child tag ID for identifying the child tag 10 from the child tag 10, and transfers them to the information processing device 30.

4. Operational flow of information processing device

Figure 5 shows the operation flow of the information processing device.

The calculation unit 300 of the information processing device 30 receives the operation mode (stop mode, non-automatic driving mode, automatic driving mode), change point, and child tag ID output by the child tag 10 from the parent tag 20 via the USB interface 31 (step S301). In this example, the calculation unit 300 receives the non-automatic driving mode and the time of change point t0 (the time when it changed to the non-automatic driving mode), the automatic driving mode and the time of change point t2 (the time when it changed to the automatic driving mode), and the stop mode and the time of change point t7 (the time when it changed to the stop mode).

The calculation unit 300 calculates the availability of the target machine 40 identified by the target machine ID 312 registered in the child tag table 310 in association with the received child tag ID 311. Specifically, the calculation unit 300 calculates the duration of the operation mode based on the received operation mode and change point (step S302). In this example, the calculation unit 300 calculates the duration of the non-automatic operation mode (t0 ₂ -t0 ₁ ) based on the non-automatic operation mode and the time of change point t0 ₁ , and the automatic operation mode and the time of change point t0 _2. The calculation unit 300 calculates the duration of the automatic operation mode (t3 ₄ -t0 ₂ ) based on the automatic operation mode and the time of change point t0 ₂ , and the stop mode and the time of change point t7.

The calculation unit 300 calculates the ratio of the duration of each operation mode to the unit time based on the duration calculated for each operation mode (step S303). The "unit time" is 24 hours, 8 hours, or the like, and is set in advance for each target machine 40 or each site (such as a manufacturing plant). In this example, the calculation unit 300 can calculate the ratio of the duration of the non-automatic operation mode to the unit time by using the duration of the non-automatic operation mode (t0 ₂ -t0 ₁ ) as the numerator and the unit time as the denominator. The calculation unit 300 also calculates the ratio of the duration of the automatic operation mode to the unit time by using the duration of the automatic operation mode (t3 ₄ -t0 ₂ ) as the numerator and the unit time as the denominator. Furthermore, the calculation unit 300 calculates the ratio of the duration of the stop mode to the unit time by using the duration of the stop mode (tx -t3 ₄ ) (tx is the point of change when the non-automatic operation mode or the automatic operation mode is next entered; not shown) as the numerator and the unit time as the denominator. The "proportion of the duration of the automatic driving mode to the unit time" is the availability rate of the target machine 40. Alternatively, the calculation unit 300 may calculate the "proportion of the duration of the automatic driving mode and the duration of the non-automatic driving mode to the unit time" as the availability rate of the target machine 40 (the setting may be variable according to needs).

The calculation unit stores the ratio of the autonomous driving mode to the unit time (operation rate), the ratio of the non-autonomous driving mode to the unit time, and the ratio of the stop mode to the unit time in the storage device 34 as a log 320, and outputs them to the output device 33 (displays them on the display) (step S304).

5. Conclusion

According to this embodiment, the child tag 10 has a sensor 11 capable of detecting vibration or acceleration of the target device 40, a wireless communication interface 13, and a determination unit 100 that detects characteristic points of the vibration or acceleration, calculates an interval time between adjacent characteristic points, determines an operation mode based on the difference between adjacent interval times, determines a change point indicating a time point when the operation mode changed, and outputs the operation mode and the change point via the wireless communication interface 13. The information processing device 30 has a calculation unit 300 that calculates the operating rate of the target device 40 based on the operation mode and change point output by the child tag 10.

According to this embodiment, the child tag 10 determines the operation mode based on the vibration or acceleration of the target machine 40 detected by the sensor 11. Therefore, the operation mode of the target machine 40 can be determined and the operation rate of the target machine 40 can be calculated with much simpler equipment (sensor 11) than typical technologies (installation of an operation counter, acquisition of data from the machine's control panel, acquisition of operation/non-operation data from a signal light, etc.) at a reduced cost. In addition, the child tag 10 installed on the target machine 40 only needs to have the sensor 11, wireless communication interface 13, and judgment unit 100. Therefore, the child tag 10 can be made small and lightweight enough to be attached to the target machine 40. For example, if it is desired to obtain the operation rate of an old target machine 40, it is sufficient to attach the child tag 10 to the old target machine 40, so there is no need to modify the old machine itself, and the sensor system 1 can be introduced easily and inexpensively.

The judgment unit 100 judges the operation mode as a non-automated driving mode when the difference between adjacent interval times is equal to or greater than a threshold value, judges the operation mode as an automatic driving mode when the difference between adjacent interval times is less than a threshold value, and judges the operation mode as a stop mode when the length of the interval time is equal to or greater than a predetermined length.

In this way, by determining the operation mode based on the interval time of the characteristic points of vibration or acceleration, it is possible to accurately determine the operation mode of the target machine 40 that is expected to operate automatically periodically.

Non-automatic operation modes include setup mode, prototype mode and idling mode.

In this way, by distinguishing non-automatic operation modes, including setup mode, prototype mode, and idling mode, from automatic operation modes, it is possible to accurately calculate the operating rate of the target machine 40.

The determination unit 100 outputs the operating mode and the change point at the timing when the change point is determined.

In this way, the child tag 10 does not always output the operating mode, but outputs the operating mode and the change point only when a change point is determined. This reduces the amount of data transmitted wirelessly, reducing the possibility of a large number of packets for data communication flying around, causing frequent interference and compromising communication reliability in a factory where many target machines 40 and child tags 10 are installed. In addition, because the child tag 10 only needs to output the operating mode and change point a minimum number of times, consumption of the child tag 10's built-in battery is reduced.

The calculation unit 300 calculates the duration of the operation mode based on the operation mode and change point output by the child tag 10, and calculates the operating rate of the target machine 40 based on the duration.

In this way, the duration of the operating mode is calculated by calculating the time from one change point to the next. This eliminates the need to constantly monitor the operation of the target device 40, making it possible to calculate the duration of the operating mode of the target device 40 accurately and with low load.

The calculation unit 300 calculates the ratio of the duration of the autonomous driving mode to a unit time as the operation rate.

This allows the operating rate of the target machine 40 to be accurately calculated by calculating the percentage of the duration of the automatic operation mode as the operating rate.

The parent tag 20 receives the operating mode and change points output by the child tag 10 and transfers them to the information processing device 30.

By having the parent tag 20 between the child tag 10 and the information processing device 30, the parent tag 20 can store the operating mode and change points received from the child tag 10 as necessary (e.g., when the information processing device 30 is powered off) and transfer them to the information processing device 30.

A plurality of child tags 10 can be connected to a parent tag 20,
The calculation unit 300 calculates the operating rates of the target machines 40, respectively, based on the operation modes and change points output by the child tags 10.

The multiple child tags 10 are typically installed on multiple target machines 40 installed at the same site (such as a manufacturing plant). One parent tag 20 transfers communications from the multiple child tags 10 to the information processing device 30. Therefore, if it is desired to obtain the operating rate of multiple target machines 40, by attaching child tags 10 to multiple target machines 40, one parent tag 20 can send communications from the multiple child tags 10 to the information processing device 30, eliminating the need to install expensive equipment on each of the multiple target machines 40, and allowing the sensor system 1 to be installed easily and inexpensively.

The target machine 40 is a molding machine, a press machine, or a die-casting machine.

The molding machine, press machine, or die-casting machine is expected to operate automatically periodically. Therefore, it is possible to accurately determine the operating mode of the target machine 40 (molding machine, press machine, or die-casting machine) that is expected to operate automatically periodically.

Although the embodiments and variations of the present technology have been described above, the present technology is not limited to the above-described embodiments, and various modifications can of course be made without departing from the spirit of the present technology.

REFERENCE SIGNS LIST 1 sensor system 10 child tag 11 sensor 12 control circuit 13 wireless communication interface 20 parent tag 30 information processing device 31 USB interface 32 control circuit 33 output device 34 storage device 40 target device 100 determination unit 300 calculation unit 310 child tag table 320 log

Claims (9)

A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
A characteristic point of the vibration or acceleration is detected, and the characteristic point corresponds to the vibration or acceleration at a time when the target machine makes a specific movement during operation;
When three consecutive feature points are detected, an interval time between the adjacent feature points is calculated, the interval time between the adjacent feature points being the length of a time interval between two consecutive feature points;
An operation mode is determined based on a difference between two adjacent interval times ,
When the difference between two adjacent interval times is equal to or greater than a threshold value, it is determined that the vehicle is in a non-automatic driving mode,
When a difference between two adjacent interval times is less than the threshold value, the system determines that the vehicle is in an autonomous driving mode, and sets a first interval time of the two adjacent interval times in which the difference is less than the threshold value as a reference interval time;
If no feature point is detected when the reference interval time has elapsed since the last detected feature point, and if no feature point of vibration or acceleration is detected for a predetermined time length or longer that is longer than the interval time of the non-automatic driving mode, it is determined that the mode has changed to the stop mode,
continue detecting three consecutive feature points, with the most recently detected third feature point being treated as a new first feature point, and continue determining an operation mode based on a difference between two adjacent interval times each time three consecutive feature points are detected;
determining a transition point indicative of when the operational mode changed, where:
determining that the first detected characteristic point is a change point indicating a time point at which the vehicle changed from the stop mode to the non-automated driving mode;
determining that the characteristic point, which is the start point of the reference interval time, is a change point indicating a time point at which the non-automatic driving mode is changed to the automatic driving mode;
determining that a point in time obtained by adding the reference interval time to the previously detected feature point is a change point indicating a point in time when the autonomous driving mode was changed to the stop mode;
a determination unit that outputs the operation mode and the change point via the wireless communication interface at a timing when the change point is determined ;
and a child tag having
an information processing device having a calculation unit that calculates an operating rate of the target machine based on the operation mode and the change point output by the child tag;
A sensor system comprising: 2. The sensor system of claim 1 ,
The non-automated operation modes include a setup mode, a prototype mode, and an idling mode. 3. The sensor system according to claim 1 ,
The calculation unit calculates a duration of the operation mode based on the operation mode and the change point output by the child tag, and calculates an availability rate of the target machine based on the duration. The sensor system according to claim 3 ,
The calculation unit is
Calculating a duration of the non-automatic driving mode based on the non-automatic driving mode and a time of a change point at which the driving mode changed to the non-automatic driving mode, and the automatic driving mode and a time of a change point at which the driving mode changed to the automatic driving mode;
Calculating a duration of the autonomous driving mode based on the autonomous driving mode and a time of a change point at which the autonomous driving mode was changed to the autonomous driving mode, and based on the stop mode and a time of a change point at which the autonomous driving mode was changed to the stop mode;
Calculating a ratio of the duration of the non-automatic driving mode to a unit time using the duration of the non-automatic driving mode as a numerator and a unit time as a denominator;
Calculate a ratio of the duration of the autonomous driving mode to a unit time using the duration of the autonomous driving mode as a numerator and the unit time as a denominator,
Calculating a ratio of the duration of the stop mode to a unit time using the duration of the stop mode as a numerator and the unit time as a denominator;
a ratio of a duration of the autonomous driving mode to the unit time , or a ratio of a duration of the autonomous driving mode and a duration of the non-autonomous driving mode to the unit time , as the operation rate. A sensor system according to any one of claims 1 to 4 ,
The sensor system further comprises a parent tag that receives the operation mode and the change point outputted from the child tag and transfers them to the information processing device. The sensor system according to claim 5 ,
A plurality of the child tags can be connected to the parent tag,
The calculation unit calculates the operation rates of the target machines based on the operation modes and the change points output by the child tags. A sensor system according to any one of claims 1 to 6 ,
The target machine is a molding machine, a press machine, or a die-casting machine. A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
A characteristic point of the vibration or acceleration is detected, and the characteristic point corresponds to the vibration or acceleration at a time when the target machine makes a specific movement during operation;
When three consecutive feature points are detected, an interval time between the adjacent feature points is calculated, the interval time between the adjacent feature points being the length of a time interval between two consecutive feature points;
An operation mode is determined based on a difference between two adjacent interval times ,
When the difference between two adjacent interval times is equal to or greater than a threshold value, it is determined that the vehicle is in a non-automatic driving mode,
When a difference between two adjacent interval times is less than the threshold value, the system determines that the vehicle is in an autonomous driving mode, and sets a first interval time of the two adjacent interval times in which the difference is less than the threshold value as a reference interval time;
If no feature point is detected when the reference interval time has elapsed since the last detected feature point, and if no feature point of vibration or acceleration is detected for a predetermined time length or longer that is longer than the interval time of the non-automatic driving mode, it is determined that the mode has changed to the stop mode,
continue detecting three consecutive feature points, with the most recently detected third feature point being treated as a new first feature point, and continue determining an operation mode based on a difference between two adjacent interval times each time three consecutive feature points are detected;
determining a transition point indicative of when the operational mode changed, where:
determining that the first detected characteristic point is a change point indicating a time point at which the vehicle changed from the stop mode to the non-automated driving mode;
determining that the characteristic point, which is the start point of the reference interval time, is a change point indicating a time point at which the non-automatic driving mode is changed to the automatic driving mode;
determining that a point in time obtained by adding the reference interval time to the previously detected feature point is a change point indicating a point in time when the autonomous driving mode was changed to the stop mode;
a determination unit that outputs the operation mode and the change point via the wireless communication interface at a timing when the change point is determined ;
A child tag that includes: A control circuit of the information processing device,
A sensor capable of detecting vibration or acceleration of a target machine;
A wireless communication interface;
A characteristic point of the vibration or acceleration is detected, and the characteristic point corresponds to the vibration or acceleration at a time when the target machine makes a specific movement during operation;
When three consecutive feature points are detected, an interval time between the adjacent feature points is calculated, the interval time between the adjacent feature points being the length of a time interval between two consecutive feature points;
An operation mode is determined based on a difference between two adjacent interval times ,
When the difference between two adjacent interval times is equal to or greater than a threshold value, it is determined that the vehicle is in a non-automatic driving mode,
When a difference between two adjacent interval times is less than the threshold value, the system determines that the vehicle is in an autonomous driving mode, and sets a first interval time of the two adjacent interval times in which the difference is less than the threshold value as a reference interval time;
If no feature point is detected when the reference interval time has elapsed since the last detected feature point, and if no feature point of vibration or acceleration is detected for a predetermined time length or longer that is longer than the interval time of the non-automatic driving mode, it is determined that the mode has changed to the stop mode,
continue detecting three consecutive feature points, with the most recently detected third feature point being treated as a new first feature point, and continue determining an operation mode based on a difference between two adjacent interval times each time three consecutive feature points are detected;
determining a transition point indicative of when the operational mode changed, where:
determining that the first detected characteristic point is a change point indicating a time point at which the vehicle changed from the stop mode to the non-automated driving mode;
determining that the characteristic point, which is the start point of the reference interval time, is a change point indicating a time point at which the non-automatic driving mode is changed to the automatic driving mode;
determining that a point in time obtained by adding the reference interval time to the previously detected feature point is a change point indicating a point in time when the autonomous driving mode was changed to the stop mode;
a determination unit that outputs the operation mode and the change point via the wireless communication interface at a timing when the change point is determined ;
The availability rate of the target machine is calculated based on the operation mode and the change point output by a child tag having the
Calculating a duration of the non-automatic driving mode based on the non-automatic driving mode and a time of a change point at which the driving mode changed to the non-automatic driving mode, and the automatic driving mode and a time of a change point at which the driving mode changed to the automatic driving mode;
Calculating a duration of the autonomous driving mode based on the autonomous driving mode and a time of a change point at which the autonomous driving mode was changed to the autonomous driving mode, and based on the stop mode and a time of a change point at which the autonomous driving mode was changed to the stop mode;
Calculating a ratio of the duration of the non-automatic driving mode to a unit time using the duration of the non-automatic driving mode as a numerator and a unit time as a denominator;
Calculate a ratio of the duration of the autonomous driving mode to a unit time using the duration of the autonomous driving mode as a numerator and the unit time as a denominator,
Calculating a ratio of the duration of the stop mode to a unit time using the duration of the stop mode as a numerator and the unit time as a denominator;
The ratio of the duration of the autonomous driving mode to the unit time , or the ratio of the duration of the autonomous driving mode and the duration of the non-autonomous driving mode to the unit time is calculated as the operation rate.
An information processing program that operates as a calculation unit.

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