JP7312087B2 - operating time monitor - Google Patents

Description

The present invention relates to an operation time monitoring device for a railroad crossing barrier.

A railroad crossing machine is installed at a railroad crossing to block traffic on the railroad crossing when a train passes. One of the maintenance/inspection items for this railroad crossing barrier is the monitoring of the operating time associated with the ascending and descending operations. In particular, the operation time for lowering (the time from the start of lowering of the bar to the completion of the interruption) must be kept within a specified time so that the train can pass. For example, Japanese Laid-Open Patent Publication No. 2002-100001 discloses a technique for detecting inability to lower a breaking rod that cannot be completely lowered within a predetermined period of time.

JP 2014-91417 A

However, the conventional monitoring circuit acquires a drive control signal for raising and lowering output by a drive control circuit that drives and controls the raising and lowering of the breaking rod, and detection signals of various detection switches input by the drive control circuit, etc., to determine the operating time. It was a monitoring system. Therefore, in order to acquire the input/output signals of the drive control circuit, it is necessary to add wiring from the railroad crossing barrier to the railroad crossing control circuit, change the railroad crossing control circuit, and the like.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to easily and properly calculate the operating time for the ascent or descent of a railroad crossing barrier from the outside of the railroad crossing barrier.

A first invention for solving the above problems is
An operation time monitoring device for monitoring the operation time of a railroad crossing barrier driven by power supplied from a power supply line,
a current measuring unit that measures the current of the power supply line;
The operation start time is determined by determining that the current measurement value by the current measurement unit exceeds a variation allowable range based on a given standby current value, and after the determination of the operation start time, the current measurement value is The end of the operation is determined by determining that a predetermined end initial condition is satisfied and the fluctuation of the current measurement value satisfies a predetermined convergence condition, and the railroad crossing blocker is operated from the start of the operation to the end of the operation. an operation time calculation unit that calculates the operation time related to the upward or downward movement of the
It is an operating time monitoring device comprising:

According to the first invention, it is possible to determine the operation start time by determining that the measured current value of the power supply line that supplies power to the railroad crossing has exceeded the allowable fluctuation range. Further, by determining that the current measurement value satisfies a predetermined end initial condition and that the variation satisfies the convergence condition after determining the operation start time, it is possible to determine the operation end time. Then, it is possible to calculate the operation time for the ascending or descending operation of the railroad crossing barrier from the determined operation start time and operation end time. According to this, by installing the current measuring unit in the power supply line and processing the current measurement value, it is possible to calculate the operating time for the ascending or descending operation of the railroad crossing barrier. Therefore, it is possible to easily and properly calculate the operation time for the operation of raising or lowering the railroad crossing from the outside of the railroad crossing.

Moreover, as a second invention,
Standby current for performing update setting control of the standby current value based on the measured current value when the measured current value exceeds a small fluctuation range based on the standby current value set as a range narrower than the allowable fluctuation range. value setting part,
You may constitute the operation time monitoring apparatus of 1st invention which further comprises.

According to the second invention, when the small fluctuation range based on the standby current value used as the reference of the fluctuation allowable range is set, and the small fluctuation range narrower than the fluctuation allowable range is set, and the current measurement value exceeds the small fluctuation range In addition, update setting control of the standby current value can be performed. Since the measured current value is the current flowing through the power line that supplies power to the railroad crossing, the power supplied from the power supply source fluctuates, for example, according to the power supply and demand (for example, according to fluctuations in the grid power). , the current measurement may also fluctuate. Since the standby current value can be updated with the current measurement value, it is possible to set an appropriate standby current value in consideration of this variation at any time.

Moreover, as a third invention,
The operation time calculation unit exceeds the allowable variation range when the current measurement value exceeds the allowable variation range until a predetermined start time determination time elapses after exceeding the small variation range. Determining the time when the operation is started,
The operating time monitoring device of the second invention may be constructed.

According to the third invention, when the current measurement value exceeds the small fluctuation range and then exceeds the fluctuation allowable range until the start determination time elapses, the fluctuation allowable range is exceeded The operation time can be calculated using the point in time as the operation start time.

Moreover, as a fourth invention,
The standby current value setting unit updates and sets the standby current value with the measured current value at the time of the operation end when the operation time calculation unit determines the operation end time.
The operating time monitoring device of the second or third invention may be constructed.

According to the fourth invention, the standby current value can be updated and set with the current measurement value at the end of the operation.

Moreover, as a fifth invention,
When the measured current value satisfies the initial condition for termination and the fluctuation of the measured current value satisfies the convergence condition, the operation time calculation unit determines a point in time preceding a predetermined termination time determination time as the operation termination time. judge,
The operating time monitoring device of any one of the first to fourth inventions may be constructed.

According to the fifth invention, when the measured current value satisfies the initial termination condition after the determination at the start of the operation and the fluctuation of the measured current value satisfies the convergence condition, the operation is performed at the time point before the determination time at the end. As the end time, the operating time can be calculated.

Also, as a sixth invention,
The convergence condition is that the variation of the current measurement value is within a predetermined variation range during the termination determination time.
The operating time monitoring device of the fifth invention may be constructed.

According to the sixth invention, when the measured current value satisfies the predetermined termination initial condition, and the termination determination time has passed while the fluctuation of the measured current value is within the predetermined fluctuation range, the measured current value It is possible to calculate the operation time by setting the operation end time to the time when the variation of is within a predetermined variation range.

FIG. 2 is a block diagram showing the overall system with operating time monitoring device; FIG. 4 is a schematic diagram showing an example of a schematic waveform of current supplied to a railroad crossing. FIG. 4 is a diagram for explaining values before and after updating setting of the standby current value; 4 is a flowchart for explaining the flow of operation time calculation processing;

An example of a preferred embodiment of the present invention will be described below with reference to the drawings. In addition, the present invention is not limited by the embodiments described below, and the forms to which the present invention can be applied are not limited to the following embodiments. Moreover, in the description of the drawings, the same reference numerals are given to the same parts.

[System configuration]
FIG. 1 is a block diagram showing the overall system provided with the operation time monitoring device 10 of this embodiment. The operation time monitoring device 10 of the present embodiment is for monitoring the operation time of the railroad crossing barrier 50 and is provided at a position separated from the railroad crossing barrier 50 . For example, as shown in FIG. 1, the operating time monitoring device 10 is accommodated in the railroad crossing equipment box 1 together with the railroad crossing control circuit 40, and monitors the operating time from the outside of the railroad crossing barrier 50. FIG. The railroad crossing control circuit 40 and the railroad crossing barrier 50 can be used as they are, and do not require modification. Further, the operating time monitoring device 10 monitors the operating time of the railroad crossing barrier 50 with the conventional signal line for the control signal electrically connecting the railroad crossing control circuit 40 and the railroad crossing barrier 50 .

The railroad crossing control circuit 40 performs a control input for causing the railroad crossing barrier 50 to ascend or descend. Specifically, when the railroad crossing control circuit 40 receives a notification from the outside (for example, a railroad crossing controller) that a train is approaching a railroad crossing where the railroad crossing barrier 50 to be controlled is installed, the railroad crossing control circuit 40 descends to the railroad crossing barrier 50 . Output commands. In response to this, the railroad crossing barrier 50 lowers and holds the barrier rod to a predetermined lowered position. Subsequently, when receiving a notification that the train has finished passing through the railroad crossing, the railroad crossing control circuit 40 outputs a lift command to the railroad crossing breaker 50 . In response to this, the railroad crossing control circuit 40 raises the breaking rod in the lowered position and holds it at a predetermined raised position.

The operating time monitoring device 10 includes a processing device 11 and a current measuring section 13 .

The current measurement unit 13 is installed in the power line 3 that supplies power to the railroad crossing breaker 50 and measures the current flowing through the power line 3 . The measurement result is output to the processing device 11 as a signal indicating the current measurement value (hereinafter simply referred to as "current measurement value"). The type of current sensor used as the current measurement unit 13 is not particularly limited, but for example, a clamp-type current sensor that clamps the power supply line 3 and performs current measurement can be used.

The processing device 11 can be configured as a computer control board or an arithmetic control circuit unit including a control device such as a CPU, a storage device, a communication device for controlling communication with the central device 60, and the like. The storage device stores various data necessary for the operation of the operating time monitoring device 10, the current measurement value by the current measuring unit 13, the calculation result of the operating time, and the like.

The processing device 11 includes an operating time calculation section 111 and a standby current value setting section 113 . The operation time calculation unit 111 uses the current measurement value of the current measurement unit 13 to perform operation start determination processing and operation end determination processing for the ascending or descending operation of the railroad crossing breaker 50, and calculates the operation time related to the operation. Calculate The standby current value setting unit 113 performs update setting control of the standby current value based on the current measurement value from when it is determined that the operation is finished until it is determined that the operation is started.

Here, the calculation of the operation time and the update setting of the standby current value will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a schematic diagram showing waveforms of measured current values before and after one target operation (ascending or descending) of the railroad crossing breaker 50, with the vertical axis representing the current value and the horizontal axis representing time.
FIG. 3 is a diagram showing values before and after the standby current value _IW is updated, together with an example of a schematic waveform of the current measurement value _IM .

First, the railroad crossing breaker 50 holds the breaking rod at the raised position or the lowered position when the railroad crossing breaker 50 is not moving up or down, and the railroad crossing breaker 50 is supplied with a current for that purpose (hereinafter referred to as "standby current"). flows, the current value is generally constant. That is, as shown by the flat portions at both ends of the graph in FIG. 2, the current value outside the operation time of the railroad crossing barrier 50 fluctuates somewhat, but exhibits a substantially constant value near a predetermined value. On the other hand, when the railroad crossing breaker 50 is raised or lowered, the electric motor is driven to operate the breaking rod, or the electric motor is in an electromotive state due to the restoring force of the spring, so the current value changes greatly.

However, the shape of the current waveform during the operation is different depending on whether the operation is rising or falling. Also, even during the same ascending operation and descending operation, the waveform varies depending on the type of railroad crossing barrier 50 . On the other hand, the magnitude of the standby current also varies depending on the type of railroad crossing barrier 50 . In addition, even the same type of railroad crossing barrier 50 may fluctuate under the influence of the external environment such as the power supply environment. Therefore, conventionally, it has been difficult to uniformly specify the operating time from the shape of the current waveform or the current value itself.

Therefore, the processing device 11 repeatedly determines whether or not the current measurement value _IM by the current measurement unit 13 satisfies the small fluctuation condition based on the given standby current value _IW , and the current measurement value _IM is stabilized. Determine whether or not the state exists.

The small fluctuation condition is that "the measured current value _IM is within the small fluctuation range". The small fluctuation range is defined as a first fluctuation width range with the standby current value _IW as a reference value. The first fluctuation range can be, for example, a value range of ±α. α is a predetermined value and is set in advance. Then, if the measured current value _IM is within the small fluctuation range, it is determined that the state is stable. In FIGS. 2 and 3, the upper and lower limits of the small fluctuation range are indicated by dashed lines.

Then, while it is determined that the small fluctuation condition is satisfied, it is in a standby state as it is. On the other hand, when it is determined that the small fluctuation condition is not satisfied, the operation start determination process is performed. Specifically, in the operation start time determination process, first, it is repeatedly determined whether or not the operation start condition is satisfied for a predetermined time (hereinafter referred to as "start time determination time") Ta. If the operation start condition is satisfied before the start determination time Ta elapses after it is determined that the small fluctuation condition is not satisfied, the time when the operation start condition is satisfied is determined as the operation start time.

The operation start condition is "that the measured current value _IM is out of the allowable fluctuation range". The allowable fluctuation range is the range of the second fluctuation width with the standby current value _IW as the reference value. The second variation width can be, for example, a value width of ±β. β is a predetermined value and is set in advance as a value larger than α. In FIGS. 2 and 3, the upper limit and lower limit of the permissible fluctuation range are indicated by two-dot chain lines.

For example, in the example of FIG. 2, the current measurement value I _M fluctuates to a value exceeding the upper limit (I W +α) of the small fluctuation range (I _W −α≦I _M ≦I _{W +} α) at time T1. there is Then, the measured current value I _M exceeds the upper limit value (I W +β) of the allowable fluctuation range (I _W −β≦I _M ≦I _W +β) at time T3 before the elapse of the start determination _time Ta. fluctuating in value. Therefore, the time T3 of the change is determined as the operation start time, and the state of the railroad crossing barrier 50 is changed to the "operating state".

On the other hand, when it is determined that the small fluctuation condition is not satisfied and the operation start condition is not satisfied until the start determination time Ta elapses, it is determined that the standby current value _IW has fluctuated, and the standby current value _IW is changed at that time. is rewritten with the measured current value _IM , and the standby current value _IW is updated and set. This is the update setting control of the standby current value based on the current measurement value.

For example, in the example of FIG. 3, the current measurement value I _M fluctuates to a value exceeding the upper limit value (I _W +α) of the small fluctuation range at time T11, and does not satisfy the small fluctuation condition. After that, the start determination time Ta has passed while the small fluctuation condition is not satisfied and the operation start condition is not satisfied (the measured current value _IM remains outside the small fluctuation range and within the fluctuation allowable range). . Therefore, the measured current value _IM at the time point T31 of the passage is updated and set as the standby current value _IW . Since the current measurement value I _M is the flowing current of the power supply line 3 that supplies power to the railroad crossing breaker 50, the power supplied from the power supply source changes, for example, according to the power supply and demand (for example, according to fluctuations in the system power). Due to the fluctuation, the current measurement value _IM may also fluctuate. By catching such fluctuations and performing control to update the standby current value _IW with the measured current value _IM , it is possible to set appropriate small fluctuation conditions and operation start conditions in consideration of the fluctuations at any time.

According to the operation start determination process described above, when the measured current value _IM is out of the small fluctuation range and is no longer stable, and then becomes out of the fluctuation allowable range before the start determination time Ta elapses. In addition, it can be determined that the operation is started when the fluctuation is out of the permissible range. On the other hand, if there is a change from the stable state but remains within the allowable fluctuation range, the standby current value _IW , which is the reference value for the small fluctuation range and the allowable fluctuation range, is updated, and it is not judged to be the start of operation. .

Next, the operation end determination process will be described. In the present embodiment, the operation end determination process is started when it is determined in the operation start time determination process that it is time to start the operation. In the example of FIG. 2, the operation end determination process is started at time T3 when it is determined that the operation is to start. The operation termination time determination process includes two determinations, ie, whether or not the initial termination condition is satisfied, and whether or not the convergence condition is satisfied.

The initial condition for termination is that the measured current value _IM is within the judgment range. The determination range is, for example, the range of the second fluctuation width with the standby current value _IW as the reference value. Specifically, the range of value width of ±β with reference to the standby current value _IW is set as the judgment range. A range of a third variation width different from the second variation width may be used as the determination range. Specifically, the third fluctuation range may be a value range of ±γ, and the range of the value range of ±γ based on the standby current value _IW may be used as the determination range.

After the measured current value _IM falls within the determination range and satisfies the termination initial condition, it is determined whether or not the variation in the measured current value _IM satisfies the convergence condition. The convergence condition is, for example, that "a predetermined period of time Tb (hereinafter referred to as 'termination time determination time') has elapsed while the fluctuation of the measured current value _IM is within the first fluctuation range". Then, when the convergence condition is satisfied, it is determined that the operation end time is the time point preceding the end time determination time Tb from that time point. Also, the standby current value _IW is rewritten with the current measurement value _IM at the time when it is determined that the operation is finished, and the standby current value _IW is updated. This is the update setting control of the standby current value based on the current measurement value.

For example, in the example of FIG. 2, it is determined that the measured current value I _M falls below the upper limit value (I _W +β) of the determination range at time T4 and falls within the determination range, and satisfies the termination initial condition. Then, at time T6, when the variation range of the current measurement value _IM during the past end time determination time Tb, going back from the determination time point, is within the first variation range, the variation of the current measurement value _IM reaches the first variation range. It is determined that the termination determination time Tb has passed while remaining within the fluctuation width, that is, the convergence condition is satisfied. Then, a time point T5, which is the end time determination time Tb before the time point T6, is determined as the operation end time, and the state of the railroad crossing barrier 50 after the time point T5 is set to the "standby state". Further, the current measurement value _IM at time T5 when it is determined that the operation is finished is updated and set as the standby current value _IW .

According to this, it can be determined that the measured current value _IM has converged, assuming that the measured current value _IM is within the determination range and the fluctuating value width is within the first fluctuation width during the termination determination time Tb. , it can be determined that the operation is finished. Then, the point in time before the termination determination time Tb from the point in time when it was determined that the value width of the measured current value _IM was within the first fluctuation range during the termination determination time Tb is defined as the operation termination time. can judge.

After that, the processing device 11 calculates the time of the "motion state" from the motion start time T3 to the motion end time T5 as the motion time of the target motion. Then, the calculated operation time is associated with the time information of each time point T3, T5 as operation time data, and is accumulated and saved in the storage device. It also transmits this operating time data to the central unit 60 (see FIG. 1). The operation time data may be transmitted to the central unit 60 each time the operation time is calculated, or the operation time data accumulated in the storage device may be collectively transmitted to the central unit 60 at a predetermined timing such as once a day. good too.

The central device 60 is communicably connected via the network 7 to the processing device 11 of the operating time monitoring device 10 installed for each railroad crossing barrier 50 to be monitored, and collects operating time data for each railroad crossing barrier 50 . do. Then, by comparing the time length of the operation time with a reference time length, malfunction of each railroad crossing barrier 50 is detected. Specifically, when the operation time is longer than the maximum allowable time length or shorter than the minimum allowable time length, it is determined that the railroad crossing barrier 50 has malfunctioned. Then, when a malfunction is detected, a warning is output to that effect. For example, it can be realized by displaying a message or the like to notify the staff of the railroad crossing barrier 50 in which the malfunction has occurred, or by displaying a lamp indicating the railroad crossing barrier 50 in which the malfunction has occurred.

Here, the central device 60 is configured to be able to separately collect the command time of the railroad crossing control circuit 40 that commands the railroad crossing barrier 50 to issue a descending command or a ascending command to the railroad crossing barrier 50 . For example, a railroad crossing controller installed at each of the alarm start point and the alarm end point acquires a signal that a train has passed, and stores the time at which the signal is acquired as the command time. Further, identification information indicating whether the detection signal of the railroad crossing controller at the alarm start point or the detection signal of the railroad crossing controller at the alarm end point is stored in association with the command time. On the other hand, the railroad crossing control circuit 40 also outputs a command to lower or raise the breaking rod based on the detection signal from the railroad crossing controller. It will be the same time or almost the same time as the time. Therefore, from the time information of each time T3 and T5 included in the operation time data and the command time stored in the central device 60, if the railroad crossing controller corresponding to the time is the warning start point, the descending operation is performed. , and if it is the alarm end point, it can be determined whether it is a rising operation. When a warning is output when it is determined that a malfunction has occurred, the determined type of motion (up or down) may also be presented. According to this, it is possible to make the person in charge recognize the railroad crossing barrier 50 in which malfunction has occurred and the operation type thereof, and it is possible to realize prompt maintenance and inspection work.

[Process flow]
FIG. 4 is a flowchart for explaining the flow of processing related to calculation of the operation time and update setting of the standby current value _IW performed by the processing device 11 . As shown in FIG. 4, first, the operation time calculation unit 111 starts the operation start determination process, and repeatedly determines whether or not the measured current value _IM satisfies the small fluctuation condition based on the standby current value _IW . .

Then, when it is determined that the small fluctuation condition is not satisfied (step S1: NO), time measurement is started to determine whether the start time determination time Ta has elapsed (step S3). After that, it is repeatedly determined whether or not the operation start condition is satisfied based on the current measurement value _IM .

Then, if the operation start condition is not satisfied (step S5: NO), the operation time calculation unit 111 determines that the start time determination time Ta that started timing in step S3 has not passed (step S7: NO). Return to step S5. Further, if the operation start condition is not satisfied (step S5: NO) and the start time determination time Ta has elapsed (step S7: YES), the standby current value setting unit 113 sets the current measured value I _M to update the standby current value _IW (step S9). After that, the process moves to step S23.

On the other hand, if it is determined in step S5 that the operation start condition is satisfied (step S5: YES), the operation time calculation unit 111 determines that the operation start time is the time when the operation start condition is satisfied, and the railroad crossing barrier 50 determines that the operation is started. is set to "operating state" (step S11).

Subsequently, the operation time calculation unit 111 starts the operation end determination process, and repeatedly determines whether or not the end initial condition is satisfied based on the current measurement value _IM . When determining that the end initial condition is satisfied (step S13: YES), the operating time calculation unit 111 repeatedly determines whether or not the convergence condition is satisfied.

Then, if the convergence condition is satisfied (step S15: YES), the operation time calculation unit 111 determines that the operation end time is the point in time after the end time determination time Tb, and sets the state of the railroad crossing barrier 50 to "standby". state” (step S17). Further, the standby current value setting unit 113 updates and sets the standby current value _IW with the current measurement value _IM when it is determined that the operation is finished (step S19).

After that, the operation time calculation unit 111 determines that the state of the railroad crossing barrier 50 is the "operating state" in step S11, and determines that the railroad crossing barrier 50 is in the state of the railroad crossing barrier 50 in step S17. is set to the "standby state" as the motion time of the target motion (step S21). At this time, the calculated operation time is associated with the time when the operation starts and when the operation ends, and is stored in the storage device as operation time data. Also, this operation time data is transmitted to the central unit 60 at appropriate timing. After that, the process moves to step S23.

Then, in step S23, an end determination is made, and until this process ends (step S23: NO), the process returns to step S1 and repeats the above-described processes.

As described above, according to the present embodiment, the current measurement unit 13 is installed on the power supply line 3, and the operation start time is determined by determining that the current measurement value _IM exceeds the variation allowable range. can do. For example, the time when the current measurement value _IM exceeds the variation allowable range can be determined as the operation start time. Further, after determining the operation start time, the current measurement value _IM is within the determination range and satisfies the termination initial condition, and the fluctuation satisfies the convergence condition, thereby determining the operation end time. be able to. For example, it is determined as a convergence condition that the termination determination time Tb has passed while the fluctuation of the current measurement value _IM is within the first variation range, and the time point preceding the termination determination time Tb from the time when the convergence condition is satisfied. can be determined as the end of the operation. Then, it is possible to calculate the operation time for the ascending or descending operation of the railroad crossing barrier 50 from the determined operation start time and operation end time. Therefore, it is possible to easily and properly calculate the operation time for the ascending or descending operation from the outside of the railroad crossing barrier 50 .

Further, when the measured current value _IM exceeds the small fluctuation range, the update setting control of the standby current value _IW can be performed. For example, after the measured current value _IM exceeds the small fluctuation range, if the start determination time Ta passes while the current measured value IM remains within the fluctuation allowable range, the standby current value _IW is updated with the current measured value _IM at that time. and can be used to determine whether or not it is in a stable state from the next time onwards. Further, when the end of the operation is determined, the standby current value _IW can be updated with the measured current value _IM at the end of the operation, and used to determine whether or not the state is stable after the next time. According to this, it is possible to calculate the operation time by uniform processing without being affected by the type of railroad crossing barrier 50 or the external environment.

It should be noted that the form to which the present invention can be applied is not limited to the above-described embodiment, and the addition, omission, or change of constituent elements can be applied as appropriate.

For example, the processing device 11 may be configured so that the ascending command and descending command input to the railroad crossing control circuit 40 are also input to the processing device 11, and the processing device 11 identifies the operation type (ascending/descending). Then, the identified motion type (up/down) may be included in the motion time data, stored and stored in the storage device, and transmitted to the central device 60 . Alternatively, the processing device 11 may be provided in the central device 60 .

1 railroad crossing equipment box, 10 operation time monitoring device, 11 processing device, 111 operation time calculation unit, 113 standby current value setting unit, 13 current measurement unit, 3 power supply line, 40 railroad crossing control circuit, 50 railroad crossing barrier, 7 network, 60 central equipment

Claims (6)

An operation time monitoring device for monitoring the operation time of a railroad crossing barrier driven by power supplied from a power supply line,
a current measuring unit that measures the current of the power supply line;
The operation start time is determined by determining that the current measurement value by the current measurement unit exceeds a variation allowable range based on a given standby current value, and after the determination of the operation start time, the current measurement value is The end of the operation is determined by determining that a predetermined end initial condition is satisfied and the fluctuation of the current measurement value satisfies a predetermined convergence condition, and the railroad crossing blocker is operated from the start of the operation to the end of the operation. an operation time calculation unit that calculates the operation time related to the upward or downward movement of the
An operating time monitoring device comprising: Standby current for performing update setting control of the standby current value based on the measured current value when the measured current value exceeds a small fluctuation range based on the standby current value set as a range narrower than the allowable fluctuation range. value setting part,
The operating time monitor of claim 1, further comprising: The operation time calculation unit exceeds the allowable variation range when the current measurement value exceeds the allowable variation range until a predetermined start time determination time elapses after exceeding the small variation range. Determining the time when the operation is started,
3. The operating time monitoring device according to claim 2. The standby current value setting unit updates and sets the standby current value with the measured current value at the time of the operation end when the operation time calculation unit determines the operation end time.
4. The operating time monitoring device according to claim 2 or 3. When the measured current value satisfies the initial condition for termination and the fluctuation of the measured current value satisfies the convergence condition, the operation time calculation unit determines a point in time preceding a predetermined termination time determination time as the operation termination time. judge,
The operating time monitoring device according to any one of claims 1-4. The convergence condition is that the variation of the current measurement value is within a predetermined variation range during the termination determination time.
The operating time monitoring device according to claim 5.

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