JP7579192B2 - Platform fence status monitoring device and platform fence status monitoring method - Google Patents

Description

The present invention relates to a platform fence status monitoring device, etc.

A platform fence is a safety fence installed on the platform of a railway station to prevent passengers from falling onto the tracks. As a device that ensures passenger safety, regular maintenance is essential, and in some cases the condition of the mechanical platform fence is monitored. As an example of a technology for monitoring the condition of a platform fence, Patent Document 1 describes a technology that detects abnormalities by determining the threshold value of the motor voltage when controlling the opening and closing of the door section.

JP 2020-104610 A

However, because platform gates are devices that ensure passenger safety, ideally they should be able to detect signs of an abnormality before they occur, rather than just detecting that an abnormality has occurred. However, it is not so easy to apply conventional technology that detects the occurrence of an abnormality by judging the motor voltage threshold, for example, and to detect signs of an abnormality by setting a stricter threshold.

In other words, in the case of platform gates installed in outdoor environments, the threshold value considered to be within the normal range may vary depending on environmental factors such as temperature, humidity, and vibrations caused by wind, etc. Furthermore, it is not appropriate to set a uniform threshold value for all platform gates, and a threshold value must be set individually for each platform gate. One possible method would be to acquire and accumulate measurement data for each platform gate individually after the gates are installed on the platform, and then set and update appropriate threshold values based on that measurement data, but this would take a certain amount of time to accumulate measurement data, and it would also be difficult to determine appropriate threshold values based on the large amount of accumulated data. If the threshold value is not appropriate, concerns would arise about the accuracy of detecting signs of abnormalities in the platform gates, which could ultimately lead to a decrease in the safety of the platform gates.

The present invention was made in consideration of the above circumstances, and its purpose is to make it possible to accurately detect signs of abnormalities in platform gates without being affected by environmental factors.

The first invention for solving the above problem is:
an acquisition means (e.g., acquisition unit 202 in FIG. 5 ) that acquires a first motor current waveform signal of a motor that drives a first door section and a second door section that drives a second door section when the first door section and the second door section of one or more movable platform fences are simultaneously controlled to be opened or closed;
a detection means (e.g., detection unit 204 in FIG. 5 ) that performs a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal to detect a symptom of an abnormality related to the drive mechanism of either the first door section or the second door section;
The present invention relates to a platform fence status monitoring device.

Other inventions include:
acquiring a first motor current waveform signal of a motor that drives a first door section and a second door section of one or more movable platform fences when the first door section and the second door section are simultaneously controlled to be opened or closed;
performing a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal to detect a symptom of an abnormality related to a drive mechanism of either the first door section or the second door section;
A method for monitoring the status of a platform fence may be configured to include the steps of:

According to the first invention, it is possible to accurately detect signs of abnormality in the platform fence without being influenced by environmental factors. In other words, if the drive mechanisms related to the opening and closing of the first and second door sections, which are controlled to open and close simultaneously, are both normal, the loads on the motors driving the door sections are similar to each other and there is no or small difference. However, if some abnormality or a sign of abnormality occurs in the drive mechanism related to the opening and closing of either door section, the loads on the motors will not be similar to each other and a significant difference will occur. Although the load on the motors driving the door sections also varies due to the influence of some environmental factors, the environmental factors related to the opening and closing of door sections which are controlled to open and close simultaneously can usually be considered to be equivalent. In other words, the environmental factors can be offset by comparing the first motor current waveform signal of the motor driving the first door section with the second motor current waveform signal of the motor driving the second door section. Therefore, by performing a comparison judgment process based on the first motor current waveform signal and the second motor current waveform signal, it is possible to cancel the influence of environmental factors that occur commonly in the first door section and the second door section, and as a result, it is possible to accurately detect signs of abnormalities occurring in the platform fence.

The second invention is the first invention,
The first door portion and the second door portion are left and right door portions relating to the same opening portion.
This is a platform fence status monitoring device.

The environmental factors that affect the left and right door sections related to the same opening can be considered to be equivalent. Therefore, according to the second invention, the influence of environmental factors that occur commonly in the first and second door sections can be canceled with high accuracy by a comparison judgment process based on the first motor current waveform signal and the second motor current waveform signal, and signs of abnormality occurring in the drive mechanism of either door section can be detected with high accuracy.

A third invention is the first or second invention,
The first door portion and the second door portion are door portions whose opening and closing strokes satisfy a predetermined equality condition.
This is a platform fence status monitoring device.

The motor currents of the motors driving the first and second door sections, whose opening and closing strokes satisfy the equivalent condition, can be considered to be approximately equivalent in terms of time change, including the time it takes to open and close, when each door section is normal. Therefore, according to the third invention, the influence of environmental factors that occur in common to the first and second door sections can be canceled with high accuracy by a comparison judgment process based on the first motor current waveform signal and the second motor current waveform signal, and signs of abnormality occurring in the drive mechanism of either door section can be accurately detected.

A fourth aspect of the present invention is the method according to any one of the first to third aspects of the present invention,
The detection means includes:
a difference determining means for determining a difference between the first motor current waveform signal and the second motor current waveform signal;
having
This is a platform fence status monitoring device.

According to the fourth invention, by determining the difference in the motor current waveform signals, it is possible to detect signs of abnormality related to the drive mechanism of either the first door section or the second door section. If both the drive mechanisms of the first door section and the second door section are normal, the fluctuations in the load on the motors driving the respective door sections will be equivalent, and the motor current waveform signals will also be equivalent, so the difference in the motor current waveform signals will be small. On the other hand, if some abnormality or signs of abnormality occur in the drive mechanism of either door section, the fluctuations in the load on each motor will be different, and the motor current waveform signals will be different, so the difference will be large. Therefore, it is possible to easily detect signs of abnormality based on the magnitude of the difference in the motor current waveform signals.

A fifth aspect of the present invention relates to the fourth aspect of the present invention,
The detection means includes:
a timing determination means for determining any one of a drive start timing, a drive state change timing, and a drive end timing (hereinafter collectively referred to as "timing") based on the first motor current waveform signal, and the timing based on the second motor current waveform signal;
having
the difference determination means determines the difference between the first motor current waveform signal and the second motor current waveform signal after achieving synchronization based on the timing determined by the timing determination means.
This is a platform fence status monitoring device.

Since the first door section and the second door section are driven by different motors, there may be slight differences in the actual drive timing of each door section. Therefore, according to the fifth invention, by synchronizing the first motor current waveform signal and the second motor current waveform signal based on timing and then taking the difference, it is possible to cancel the load fluctuations caused by common environmental factors with a high degree of accuracy, and it is possible to more accurately detect signs of abnormality occurring in the drive mechanism of any of the door sections.

A sixth aspect of the present invention is the method for producing a liquid crystal display device according to any one of the first to fifth aspects of the present invention,
The detection means includes:
a noise determination means for performing a predetermined frequency analysis process on each of the first motor current waveform signal and the second motor current waveform signal to determine whether or not each of the first motor current waveform signal and the second motor current waveform signal contains a noise frequency component that satisfies a predetermined frequency coincidence condition;
a noise time difference determination means for determining whether or not a time difference between noise timings in the first motor current waveform signal and the second motor current waveform signal, each of which contains a noise frequency component determined to exist by the noise determination means, satisfies a predetermined allowable time difference;
and when a positive determination is made by the noise determination means and also by the noise time difference determination means, it is determined that the noise frequency component is not a sign of an abnormality.
This is a platform fence status monitoring device.

Environmental factors that affect the load on the motor that drives the door section may include environmental factors that occur at different times depending on the door section. For example, wind blowing obliquely against the door surface of the door section is a typical example. This is because the timing at which the wind arrives varies depending on the installation position of the door section. Even when such environmental factors with a time difference occur, the sixth invention can appropriately deal with them. That is, in the sixth invention, frequency analysis processing is performed on each of the first motor current waveform signal and the second motor current waveform signal to determine whether or not there is a common noise frequency component that satisfies the frequency matching condition. Then, it is determined whether or not the time difference in the noise timing at which the common noise frequency contained in each of the first motor current waveform signal and the second motor current waveform signal occurs satisfies the tolerance condition. This makes it possible to detect signs of abnormality while taking into account the influence of environmental factors with a time difference, and it is possible to detect signs of abnormality more accurately.

A seventh aspect of the present invention is the sixth aspect of the present invention,
The time difference of the noise timing is determined based on a distance between the first door portion and the second door portion.
This is a platform fence status monitoring device.

According to the seventh invention, the time difference between the noise timings in the first motor current waveform signal and the second motor current waveform signal can be determined based on the distance between the first door section and the second door section. This allows for consideration of the fact that the time difference between the noise timings in the first motor current waveform signal and the second motor current waveform signal can differ depending on the distance between the first door section and the second door section.

An eighth aspect of the present invention is the method according to any one of the first to seventh aspects of the present invention,
The detection means includes:
a continuity determination means for determining continuity by integrating results of the comparison determination process for a plurality of consecutive opening/closing controls;
having
This is a platform fence status monitoring device.

According to the eighth invention, by combining the results of the comparison judgment process for multiple consecutive opening and closing controls, it is possible to distinguish and judge whether the fluctuation in the load on the motor that drives the door section, which is expressed in the motor current waveform signal, is due to a temporary environmental factor, such as a passenger leaning on or touching the door section, or due to a sign of some kind of abnormality in the door section's drive mechanism.

An example of the outline of platform gates. 1 shows an example of the configuration of a control device. 4 is an example of a motor current waveform signal. An example of a motor drive frequency. A functional configuration diagram of the platform fence status monitoring device. An example of door management data. 13 is a flowchart of a process for detecting a sign of abnormality. Another example of a door section that is monitored by the platform fence status monitoring device.

Below, a preferred embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiment described below, and the forms to which the present invention can be applied are not limited to the following embodiment. In addition, in the description of the drawings, the same elements are given the same reference numerals.

[Overall configuration]
1 is a front view showing a schematic configuration of a platform fence 10 to be monitored by the platform fence state monitoring device 1 of this embodiment. As a representative example, a pair of left and right platform fences 10 (10a, 10b) that open and close one opening are shown. The platform fences 10 are configured by arranging a plurality of units along the longitudinal direction of the track side edge of the platform 3, and by separating the platform 3 from the track side, they prevent passengers from falling onto the tracks.

The platform fence 10 is a movable platform fence, and each door pocket section 11 fixedly installed on the platform 3 supports a movable door section 12 so that it can slide and be opened and closed. The door section 12 is moved along the longitudinal direction of the platform 3, which is the opening and closing direction, in accordance with the arrival of a train, thereby opening and closing the opening that serves as the boarding entrance to the train.

The drive mechanism for the door section 12 can be of any configuration. For example, the drive mechanism in FIG. 1 is a belt drive type, and includes a motor 13 disposed deep inside the door pocket section 11, a drive pulley 14 connected to the output shaft of the motor 13, a driven pulley 15 disposed in front of the drive pulley 14 (on the door section 12 side), a timing belt 16 wound around these pulleys 14 and 15, and a belt clamp 17 provided at a predetermined position on the door section 12 to connect and fix the timing belt 16 to the door section 12.

The pair of left and right platform fences 10a, 10b shown in Figure 1 are basically identical in terms of the configuration of the drive mechanism, except that they are symmetrical. The door sections 12a, 12b of the platform fences 10a, 10b are left and right door sections related to a common opening. The door sections 12a, 12b are controlled to open and close simultaneously. Furthermore, the door sections 12a, 12b have the same amount of movement when opening and closing, and are door sections whose opening and closing strokes satisfy equivalent conditions. A control device 20 that controls the pair of left and right platform fences 10a, 10b related to one opening is provided on one of the platform fences 10a, 10b (platform fence 10a in Figure 1).

The technology for detecting abnormality signs in this embodiment is realized by performing a predetermined comparison and judgment process based on the first motor current waveform signal of the first motor 13a that drives the first door section 12a and the second motor current waveform signal of the second motor 13b that drives the second door section 12b. Therefore, in the following, the components related to one of the platform fences 10a, 10b will be referred to with the preface "first" as appropriate, and the components related to the other platform fence will be referred to with the preface "second" as appropriate.

In addition, in this embodiment, for ease of explanation, the platform fence status monitoring device 1 focuses on a pair of left and right platform fences 10a, 10b associated with one opening, and describes these platform fences 10a, 10b as the objects to be monitored; however, the platform fences of the same platform may be monitored collectively, or the platform fences of multiple platforms may be monitored collectively. In this case, for example, the detection process for signs of abnormality described below may be performed for the combination of left and right platform fences 10a, 10b associated with one opening as a unit.

Figure 2 is a diagram showing an outline of the configuration of the control device 20. As shown in Figure 2, the control device 20 has a drive control unit 21, a first motor drive circuit 22a that drives the first motor 13a associated with the first door portion 12a, and a second motor drive circuit 22b that drives the second motor 13b associated with the second door portion 12b.

The drive control unit 21 outputs a drive instruction signal to the first motor drive circuit 22a to drive the first motor 13a in the open direction or the close direction according to an opening/closing command from an external device, and outputs a drive instruction signal to the second motor drive circuit 22b to drive the second motor 13b in the open direction or the close direction. The first motor 13a and the second motor 13b are three-phase AC motors. The first motor drive circuit 22a supplies three-phase drive power corresponding to the drive instruction signal to the first motor 13a to drive the first motor 13a. Similarly, the second motor drive circuit 22b supplies three-phase drive power corresponding to the drive instruction signal to the second motor 13b to drive the second motor 13b. As a result, the first door portion 12a and the second door portion 12b are opened and closed simultaneously.

A first current sensor 30a that measures the current (hereinafter referred to as "motor current") is installed on the power supply cable of the three-phase driving power supplied to the first motor 13a. Similarly, a second current sensor 30b that measures the motor current is installed on the power supply cable of the three-phase driving power supplied to the second motor 13b. However, in this embodiment, the first current sensor 30a and the second current sensor 30b each measure the current of two of the three phases (e.g., U-phase and V-phase). By measuring the current of the two phases, it is possible to determine the rotation direction of the motor, i.e., whether the door section 12 is being driven in the open or closed direction.

The platform fence status monitoring device 1 acquires motor current values measured by the first current sensor 30a and the second current sensor 30b, monitors the status of the first platform fence 10a and the second platform fence 10b based on the acquired motor current values, and detects signs of abnormality related to the drive mechanisms of the first door section 12a and the second door section 12b. Specifically, a first motor current waveform signal when the first door section 12a is being controlled to open and close is captured depending on whether the motor current value measured by the first current sensor 30a exceeds a predetermined threshold value. Similarly, a second motor current waveform signal when the second door section 12b is being controlled to open and close is captured by the second current sensor 30b. Then, by comparing the first motor current waveform signal with the second motor current waveform signal, signs of abnormality related to the drive mechanisms of either the first door section 12a or the second door section 12b are detected. The motor current waveform signals being compared are waveform signals of the current for one phase (e.g., U-phase) of each of the first motor 13a and the second motor 13b.

The drive mechanisms for the door sections 12a and 12b of the pair of left and right platform fences 10a and 10b for one opening are basically the same, and the door sections 12a and 12b have the same amount of movement when opening and closing (the opening and closing strokes satisfy the equal condition). Therefore, if both drive mechanisms for the door sections 12a and 12b are normal, the load on the first motor 13a that drives the first door section 12a and the load on the second motor 13b that drives the second door section 12b when the door sections 12a and 12b are simultaneously controlled to open and close are equal, and the motor current waveform signals are also equal. In addition, it is extremely rare for the drive mechanisms for the door sections 12a and 12b to be abnormal at the same time. Therefore, if any abnormality or signs of abnormality occur in the drive mechanisms for either of the door sections 12a and 12b, the loads on the motors 13a and 13b will not be the same, and a significant difference will occur. This can be used to detect signs of abnormalities in the drive mechanism of either door section 12a or 12b.

Figure 3 is an example of a motor current waveform signal when the door section 12 is controlled to be open. The motor current waveform for one phase is shown. The motor current has a current waveform that varies depending on the load on the motor 13, that is, the load associated with the movement of the door section 12. In addition, when the motor 13 is started, an inrush current corresponding to the starting torque is generated. Since the pair of left and right first door sections 12a and second door sections 12b related to the same opening have the same amount of movement (stroke) when opening and closing, the first motor current waveform signal of the first motor 13a that drives the first door section 12a and the second motor current waveform signal of the second motor 13b that drives the second door section 12b are equivalent, including the length of the drive period from the start of drive to the end of drive.

Figure 4 is an overview of the drive frequency of the motor 13 controlled by the drive control unit 21, and shows the frequency for one opening and closing control. In Figure 4, the horizontal axis is time, and the vertical axis is frequency. As shown in Figure 4, the drive frequency of the motor 13 for one opening and closing control of the door section 12 is divided into three driving state periods: an acceleration region in which the frequency is gradually increased after the motor 13 is started to increase the rotation speed, a constant speed region in which the motor 13 is a stationary frequency that maintains the rotation speed after reaching a predetermined rotation speed, and a deceleration region in which the frequency is gradually decreased to stop the motor 13. Since the movement amounts of the door sections 12a and 12b when opening and closing are the same (the opening and closing strokes satisfy the equality condition), when controlling the opening and closing of the door sections 12a and 12b, the drive control unit 21 drives and controls the motors 13a and 13b with the same frequency control pattern so that the movement of the door sections 12a and 12b is the same.

[Detection of abnormal signs]
The platform fence status monitoring device 1 performs a comparison judgment process based on a first motor current waveform signal of a first motor 13a that drives the first door section 12a and a second motor current waveform signal of a second motor 13b that drives the second door section 12b to detect signs of an abnormality related to the drive mechanism of either the first door section 12a or the second door section 12b. Specifically, as the comparison judgment process, the difference between the first motor current waveform signal and the second motor current waveform signal is judged. The difference between the first motor current waveform signal and the second motor current waveform signal is judged by calculating the difference in amplitude between the first motor current waveform signal and the second motor current waveform signal.

The motor current waveform signal that is the subject of the difference determination may be the entire current waveform signal related to one opening and closing control of the door section 12 (the signal for the period from the start to the end of driving of the motor 13), or it may be a part of the current waveform signal related to one opening and closing control of the door section 12, such as a signal in a constant speed region.

The difference between the motor current waveform signals is determined by matching any one of the timings of the drive start timing, drive end timing, and the timing of change in the drive state (the acceleration region, constant speed region, and deceleration region shown in FIG. 4) of the motor 13. This timing can be determined by performing frequency analysis processing on the motor current waveform signal. Examples of frequency analysis processing include Fourier analysis and wavelet transformation. By performing frequency analysis processing on the motor current waveform signal, a drive frequency pattern, an example of which is shown in FIG. 4, can be obtained. From this drive frequency pattern, the timing of change in the drive state (acceleration region, constant speed region, and deceleration region), the drive start timing which is the start of the acceleration region, and the drive end timing which is the end of the deceleration region can be determined.

In order to simultaneously control the opening and closing of the first door section 12a and the second door section 12b, the drive control section 21 outputs a drive instruction signal for driving the first motor 13a to the first motor drive circuit 22a and outputs a drive instruction signal for driving the second motor 13b to the second motor drive circuit 22b. However, since the first motor drive circuit 22a and the second motor drive circuit 22b are independent of each other, even if the drive instruction signals for the first motor 13a and the second motor 13b are output simultaneously, a slight time difference may occur between the actual driving of the first motor 13a by the first motor drive circuit 22a and the driving of the second motor 13b by the second motor drive circuit 22b. Therefore, for each of the first motor current waveform signal and the second motor current waveform signal, timing such as the timing of the change in the drive state, the drive start timing, and the drive end timing are determined, and the difference between the first motor current waveform signal and the second motor current waveform signal can be determined after synchronization is achieved by matching the determined timing.

The method of synchronizing the first motor current waveform signal and the second motor current waveform signal is not limited to the above method. For example, the drive frequency patterns obtained by performing frequency analysis processing on each of the first motor current waveform signal and the second motor current waveform signal may be regarded as images, and the first motor current waveform signal and the second motor current waveform signal may be synchronized by repeatedly performing image matching while shifting the signals in the time direction at a predetermined time interval to find the time shift (time difference) at which the matching rate is considered to be maximum.

Then, the platform fence state monitoring device 1 detects a sign of an abnormality related to the drive mechanism of either the first door section 12a or the second door section 12b based on the difference between the first motor current waveform signal and the second motor current waveform signal. Since the first door section 12a and the second door section 12b have the same amount of movement when opening and closing (the opening and closing strokes satisfy the equal condition), the load on the first motor 13a that drives the first door section 12a and the load on the second motor 13b that drives the second door section 12b when controlling the opening and closing of the first door section 12a and the second door section 12b simultaneously are equal. Therefore, if both the first door section 12a and the second door section 12b are normal, the first motor current waveform signal and the second motor current waveform signal should be equal. Therefore, if the difference between the first motor current waveform signal and the second motor current waveform signal is within a predetermined tolerance range, it is determined that no signs of abnormality have been detected in the drive mechanisms of either the first door section 12a or the second door section 12b. On the other hand, if the difference exceeds the tolerance range, it is determined that there may be signs of abnormality in the drive mechanisms of either the first door section 12a or the second door section 12b, and further determination is made.

When the difference between the first motor current waveform signal and the second motor current waveform signal exceeds the allowable range, it means that the first motor current waveform signal and the second motor current waveform signal cannot be considered equivalent, and the load on the first motor 13a that drives the first door portion 12a is different from the load on the second motor 13b that drives the second door portion 12b. The difference in the load on the motor 13 is reflected as a difference in the motor current. The following three types of factors are considered to be the main factors that cause the load to be different.
(Factor A) Difference in the opening and closing force required to open and close the door sections 12a and 12b. (Factor B) Vibration due to wind pressure, sound pressure, etc. (Factor C) Impact due to contact with people or objects, etc.

Factor A is related to a mechanical or structural factor that occurred in the drive mechanism of either the first door section 12a or the second door section 12b, and is a factor that should be judged as a sign of an abnormality. On the other hand, factors B and C are environmental factors related to the surrounding environment, and are not related to an abnormality in the drive mechanism for the first door section 12a or the second door section 12b, and therefore are factors that should not be judged as a sign of an abnormality.

To distinguish between these factors A to C, the platform fence status monitoring device 1 performs frequency analysis processing on each of the first motor current waveform signal and the second motor current waveform signal to extract noise frequency components superimposed on each. For example, the frequency analysis processing is a short-time frequency analysis processing such as short-time Fourier analysis or wavelet transform. By comparing the frequency analysis result with the drive frequency, the superimposed noise frequency components can be extracted.

This frequency analysis process may be performed on the entire motor current waveform signal related to one opening/closing control of the door section 12, or on a portion of the motor current waveform signal, such as a signal in the constant speed region.

Then, (condition a) the noise frequency components extracted from the first motor current waveform signal and the second motor current waveform signal are compared to determine whether the two noise frequency components match, or (condition b) the noise frequency components have been extracted for multiple consecutive opening and closing controls for the same door section 12 and are the same frequency components, thereby finally determining whether there is a sign of an abnormality in the drive mechanism of the door section 12.

Condition a (whether both noise frequency components match) is determined based on whether (condition a-1) both noise frequency components meet a frequency match condition, which is the condition for the frequency bands in which they can be considered to match, and (condition a-2) whether the time difference between the occurrence timing (noise timing) of the noise frequency components that meet the frequency match condition in the first motor current waveform signal and the second motor current waveform signal meets the allowable time difference.

The determination of whether condition a (conditions a-1 and a-2) is satisfied can be achieved by synchronizing the first motor current waveform signal with the second motor current waveform signal, and then repeatedly performing short-time frequency analysis processing, such as short-time Fourier analysis or wavelet transform, on each of them while shifting them slightly in the time direction. The time width in the frequency analysis processing corresponds to the allowable time difference in condition a-2.

The above-mentioned factor A (the difference in the opening and closing force required to open and close the first door section 12a and the second door section 12b) is a factor that occurs in the drive mechanisms of the door sections 12a and 12b, which are independent of each other. If any abnormality symptoms appear in the drive mechanism of the door section 12, the load on the motor 13 that drives that door section 12 is different from the load in the normal case, and therefore a noise frequency component is superimposed on the motor current waveform signal of the motor 13 that drives that door section 12. Even if an abnormality symptom appears in both the drive mechanisms of the door sections 12a and 12b, the respective drive mechanisms are independent mechanisms, so the load on the motors 13a and 13b that drive the door sections 12a and 12b is different. In other words, the noise frequency components and noise timing superimposed on the first motor current waveform signal and the second motor current waveform signal do not match. In addition, because this is a sign of an abnormality in the drive mechanism of the door section 12, the same noise frequency component will be superimposed on the motor current waveform signal at the same timing every time the door section 12 is opened or closed. Therefore, the noise frequency component caused by this factor A does not satisfy condition a, but satisfies condition b.

Factor B (vibrations due to wind pressure, sound pressure, etc.) is an environmental factor caused by the surrounding environment, and usually results in vibrations of the same frequency components for both the first door section 12a and the second door section 12b, but there may be cases where the timing of vibration generation is slightly different. This is due to the distance between the installation positions of the first door section 12a and the second door section 12b, such as when wind blows obliquely against the door surface of the door section 12. This distance results in a difference in the timing of vibration generation. Therefore, the noise frequency components caused by this factor B will satisfy condition a. Note that condition b may or may not be satisfied depending on, for example, whether the wind is blowing continuously or momentarily. The allowable time difference for condition a-2 can be appropriately determined taking into account the distance between the first door section 12a and the second door section 12b. In addition, when wind blows almost perpendicularly to the door surface of the door section 12, the same noise frequency components are superimposed at the same timing, so the effect can be offset by determining the difference between the first motor current waveform signal and the second motor current waveform signal.

Factor C (shock caused by contact with a person or object, etc.) is a temporary factor caused by the surrounding environment. It is generally considered that the impact will be different for the first door section 12a and the second door section 12b. It is also difficult to imagine that the same impact will occur at the same timing during multiple consecutive opening and closing controls of the door section 12. Therefore, the noise frequency component caused by factor C does not satisfy either condition a or b.

For these reasons, the platform fence status monitoring device 1 first determines whether the noise frequency components extracted from each of the first motor current waveform signal and the second motor current waveform signal satisfy condition a. If condition a is satisfied, it is determined that the noise frequency components are due to factor B, and therefore are not a sign of an abnormality related to the drive mechanism of the first door section 12a and the second door section 12b. If condition a is not satisfied, it then determines whether condition b is satisfied. If neither condition a nor b is satisfied, it is determined that the noise frequency components are due to factor C, and therefore are not a sign of an abnormality related to the drive mechanism of the first door section 12a and the second door section 12b. On the other hand, if condition a is not satisfied but condition b is satisfied, it is determined that the noise frequency components are due to factor A, and are a sign of an abnormality related to the drive mechanism of either the first door section 12a or the second door section 12b.

[Functional configuration]
Fig. 5 is a diagram showing an example of the functional configuration of the platform fence state monitoring device 1. As shown in Fig. 5, the platform fence state monitoring device 1 includes, as functional units, an operation unit 102, a display unit 104, a communication unit 106, a processing unit 200, and a storage unit 300, and can be configured as a type of computer or CPU board.

The operation unit 102 is composed of input devices such as a keyboard, mouse, touch panel, and various switches, and outputs operation signals corresponding to operations performed to the processing unit 200. The display unit 104 is composed of a display device such as a liquid crystal display or touch panel, and performs various displays corresponding to display signals from the processing unit 200. The communication unit 106 is composed of a wired or wireless communication device, and connects to a given communication line to communicate with external devices.

The processing unit 200 is realized by an arithmetic device such as a CPU (Central Processing Unit), and issues instructions and transfers data to each component of the platform fence status monitoring device 1 based on the programs and data stored in the memory unit 300, thereby controlling the entire platform fence status monitoring device 1. The processing unit 200 also functions as each of the functional blocks of the acquisition unit 202 and the detection unit 204 by executing the platform fence status monitoring program 302 stored in the memory unit 300. However, these functional blocks can also be configured as independent arithmetic circuits using an ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), etc.

The acquisition unit 202 acquires a first motor current waveform signal of a first motor 13a that drives a first door section 12a and a second motor current waveform signal of a second motor 13b that drives a second door section 12b when a first door section 12a and a second door section 12b of one or more movable platform fences 10 are simultaneously controlled to open and close.

Specifically, the motor current value measured by the first current sensor 30a, which measures the motor current to the first motor 13a that drives the first door section 12a, is acquired as a first motor current waveform signal. Also, the motor current value measured by the second current sensor 30b, which measures the motor current to the second motor 13b that drives the second door section 12b, is acquired as a second motor current waveform signal. The opening and closing control of the first door section 12a and the second door section 12b may be determined, for example, by whether the motor current value measured by the current sensors 30a and 30b exceeds a predetermined threshold value, or by an opening and closing command to the control device 20. In this embodiment, the motor current values measured by the current sensors 30a and 30b are associated with the measurement date and time, and are temporarily accumulated and stored as motor current value data in the first door section data 312a and the second door section data 312b of the door section management data 310 (see FIG. 6). The acquisition unit 202 extracts and acquires the motor current waveform signal during the target opening and closing control from the accumulated and stored motor current value data, using the measurement time, whether the current value exceeds a predetermined threshold, etc. as criteria for judgment.

The detection unit 204 performs a predetermined comparison judgment process based on the first motor current waveform signal and the second motor current waveform signal to detect signs of abnormality related to the drive mechanism of either the first door section 12a or the second door section 12b. The detection is performed by judging the difference between the first motor current waveform signal and the second motor current waveform signal.

The detection unit 204 also determines one of the drive start timing, drive state change timing, and drive end timing (hereinafter collectively referred to as "timing") based on the first motor current waveform signal and the timing based on the second motor current waveform signal, and determines the difference between the first motor current waveform signal and the second motor current waveform signal after synchronizing them based on the determined timing.

The detection unit 204 also performs a predetermined frequency analysis process on each of the first motor current waveform signal and the second motor current waveform signal to determine whether or not there is a noise frequency component that satisfies a predetermined frequency matching condition, and determines whether or not the time difference in the noise timing in each of the first motor current waveform signal and the second motor current waveform signal that contain the noise frequency component that is determined to be present satisfies a predetermined allowable time difference. If both determinations are positive, the noise frequency component is determined not to be a sign of abnormality. The time difference in the noise timing is determined based on the distance between the first door portion 12a and the second door portion 12b. The detection unit 204 also performs a continuity determination by combining the results of the comparison determination process for multiple consecutive opening and closing controls.

Specifically, a frequency analysis process is performed on each of the first motor current waveform signal and the second motor current waveform signal, and timings such as the drive start timing and drive end timing of the motor 13 and the timing of changes in the drive state (acceleration region, constant speed region, deceleration region) are determined from the drive frequency pattern (see FIG. 4) obtained as a result of the frequency analysis process. Then, the determined timings for each of the first motor current waveform signal and the second motor current waveform signal are matched and synchronized, and the difference between the first motor current waveform signal and the second motor current waveform signal is calculated.

If the calculated difference is within a predetermined tolerance, it is determined that no signs of abnormality are detected in the drive mechanisms of the first door section 12a and the second door section 12b (normal).

If the calculated difference is outside the allowable range, a short-time frequency analysis process is further performed on each of the first motor current waveform signal and the second motor current waveform signal to extract the noise frequency components superimposed on each. Then, it is determined whether both noise frequency components match (condition a) or whether the noise frequency components are extracted in relation to multiple consecutive opening and closing controls for the same door section 12 (condition b). Based on the results of these determinations, it is finally determined whether there is a sign of abnormality related to the drive mechanism of either the first door section 12a or the second door section 12b. That is, if condition a is satisfied, it is determined that the noise frequency components are due to vibrations (factor B) caused by wind pressure, sound pressure, etc., and therefore it is not a sign of abnormality (normal). If neither condition a nor b is satisfied, it is determined that the noise frequency components are due to impacts (factor C) caused by contact with a person or object, and therefore it is not a sign of abnormality (normal). If condition a is not met but condition b is met, it is determined that the noise frequency component is due to the difference in the force required to open and close the first door section 12a and the second door section 12b (factor A), and is a sign of an abnormality in the drive mechanism of either the first door section 12a or the second door section 12b.

The memory unit 300 is realized by a storage device such as a hard disk, ROM (Read Only Memory), or RAM (Random Access Memory), and stores programs and data for the processing unit 200 to comprehensively control the platform fence status monitoring device 1. It is also used as a working area for the processing unit 200, and temporarily stores the results of calculations performed by the processing unit 200 according to various programs, input data via the communication unit 106, and the like. In this embodiment, the memory unit 300 stores a platform fence status monitoring program 302 and door section management data 310.

Figure 6 is a diagram showing an example of door section management data 310. As shown in Figure 6, the door section management data 310 is generated for each combination of left and right door sections 12 (first door section 12a and second door section 12b) related to the same opening, and stores first door section data 312a related to the first door section 12a, second door section data 312b related to the second door section 12b, and judgment result data 314.

The first door section data 312a and the second door section data 312b each include the door section ID of the corresponding door section 12, the current sensor ID of the current sensor 30 that measures the motor current of the motor 13 that drives the door section 12, and the motor current value data measured by the current sensor 30.

The judgment result data 314 is generated for each opening/closing control of the first door section 12a and the second door section 12b, and includes the date and time when the opening/closing control was performed, an opening/closing flag indicating whether the opening/closing control was an open control or a close control, a first motor current waveform signal, a second motor current waveform signal, first frequency analysis result data which is a result of a frequency analysis process on the first motor current waveform signal, second frequency analysis result data which is a result of a frequency analysis process on the second motor current waveform signal, first drive frequency pattern data for the first motor 13a obtained from the first frequency analysis result data, second drive frequency pattern data for the second motor 13b obtained from the second frequency analysis result data, and a judgment result of a sign of abnormality related to the opening/closing of the first door section 12a and the second door section 12b.

[Process flow]
7 is a flowchart illustrating the flow of processing. This processing is realized by the processing unit 200 executing the platform fence state monitoring program 302, and is performed for one opening/closing control performed on the first door portion 12a and the second door portion 12b, which are the left and right door portions relating to the same opening.

First, the acquisition unit 202 acquires motor current waveform signals during one opening/closing control, including a first motor current waveform signal of the first motor 13a that drives the door section 12a and a second motor current waveform signal of the second motor 13b that drives the door section 12b (step S1).

Next, the detection unit 204 performs frequency analysis processing on each of the acquired first motor current waveform signal and second motor current waveform signal, and determines the drive start timing, drive end timing, and drive state change timing of the motor 13 based on the drive frequency pattern obtained as a result of the frequency analysis processing (step S3).

Next, it is determined whether the opening/closing control performed is an opening control or a closing control from the acquired first motor current waveform signal and second motor current waveform signal (step S5). For example, this determination is performed by determining the rotation direction of the first motor 13a depending on whether the phase of the two-phase current waveform of the motor current from the first motor 13a measured by the first current sensor 30a is leading or lagging, thereby determining whether the first door section 12a is being driven in an opening or closing direction. Similarly, it is determined whether the second door section 12b is being driven in an opening or closing direction by determining the rotation direction of the second motor 13b depending on whether the phase of the two-phase current waveform of the motor current from the second motor 13b measured by the second current sensor 30b is leading or lagging. Then, it is possible to determine whether the opening/closing control is an opening control or a closing control depending on whether the opening/closing direction of the first door section 12a and the opening/closing direction of the second door section 12b match.

Then, after synchronizing the first motor current waveform signal and the second motor current waveform signal by matching the determined timing of the signal, the difference between the first motor current waveform signal and the second motor current waveform signal is calculated (step S7). If the calculated difference is within a predetermined allowable range (step S9: YES), it is determined that no signs of abnormality related to the drive mechanism are detected in either the first door section 12a or the second door section 12b (normal) (step S11).

On the other hand, if the calculated difference is outside the predetermined tolerance (step S9: NO), a short-time frequency analysis process is then performed on each of the first motor current waveform signal and the second motor current waveform signal to extract the noise frequency components contained in each. Then, the respective noise frequency components are compared to determine whether they match (step S13). This match determination is made by determining that the noise frequency components contained in each match if the frequency match condition is met under which the noise frequency components are deemed to match, and if the time difference in the noise timing in the motor current waveform signals meets the allowable time difference.

If the noise frequency components match (step S15: YES), it is determined that no signs of abnormality related to the drive mechanism are detected in either the first door section 12a or the second door section 12b (normal) (step S17). If the noise frequency components do not match (step S15: NO), it is determined whether a noise frequency component equivalent to the extracted noise frequency component is extracted in multiple consecutive opening and closing controls for each of the first door section 12a and the second door section 12b, that is, whether the equivalent noise frequency component is generated continuously. If the noise frequency component is generated continuously (step S19: YES), it is determined that the noise frequency component is a sign of abnormality related to the drive mechanism of the door section 12 in which the noise frequency component is generated continuously (step S21). If the noise frequency component is not generated continuously (step S19: NO), it is determined that no signs of abnormality related to the drive mechanism are detected in either the first door section 12a or the second door section 12b (normal) (step S23). Once the above steps are completed, this process ends.

[Action and Effect]
In this way, according to the present embodiment, it is possible to accurately detect signs of abnormality in the platform fence 10, regardless of environmental factors. In other words, when the drive mechanisms related to the opening and closing of the first door section 12a and the second door section 12b, which are controlled to be opened and closed at the same time, are both normal, the load on the first motor 13a that drives the first door section 12a and the load on the second motor 13b that drives the second door section 12b are similar to each other and there is no or small difference between them. However, when some abnormality or a sign of abnormality occurs in the drive mechanism related to the opening and closing of either the first door section 12a or the second door section 12b, the loads on the first motor 13a and the second motor 13b are not similar to each other and a significant difference occurs. The load on the first motor 13a that drives the first door portion 12a and the load on the second motor 13b that drives the second door portion 12b vary depending on the influence of certain environmental factors, but normally the environmental factors related to the opening and closing of the first door portion 12a and the second door portion 12b, which are controlled to open and close simultaneously, can be considered to be equivalent.

In other words, environmental factors can be offset by comparing the first motor current waveform signal of the first motor 13a that drives the first door section 12a with the second motor current waveform signal of the second motor 13b that drives the second door section 12b.

Therefore, by performing a comparison judgment process based on the first motor current waveform signal of the first motor 13a that drives the first door section 12a and the second motor current waveform signal of the second motor 13b that drives the second door section 12b, the influence of environmental factors that occur commonly to the first door section 12a and the second door section 12b can be canceled, and as a result, signs of abnormalities occurring in the platform fences 10a, 10b can be accurately detected.

[Modification]
Incidentally, the applicable embodiments of the present invention are not limited to the above-described embodiments, and can of course be modified as appropriate without departing from the spirit of the present invention.

(A) Identification of platform fence 10 where a symptom of abnormality has occurred For each of the first door section 12a and the second door section 12b, motor current waveform signals when the door section 12 is controlled to open and closed in a normal state are prepared in advance as reference motor current waveform signals. Then, when a symptom of abnormality is detected, the acquired motor current waveform signal for each of the first door section 12a and the second door section 12b is compared with a reference motor current waveform signal corresponding to the opening/closing direction to determine whether they match, thereby identifying which of the platform fences 10a, 10b has an abnormality.

(B) Combination of Door Sections 12 In the above embodiment, the left and right door sections 12a, 12b relating to the same opening have the same movement amount (opening and closing stroke is equivalent) during opening and closing control, but the present invention can be applied even when the left and right opening and closing strokes relating to the same opening are different (cannot be considered equivalent). In this case, a combination of two door sections 12 that are simultaneously opened and closed and have the same movement amount (opening and closing stroke can be considered to be equivalent), such as door sections 12 of different platform fences 10 installed on the same track of the same platform, can be treated as the first door section and the second door section, and the motor current waveform signals can be compared and determined.

Figure 8 shows an example in which the left and right door sections related to the same opening have different movement amounts (opening and closing strokes) during opening and closing control. Figure 8 shows six platform fences 10A to 10F installed on the same platform. The platform fences 10A to 10F each have three types of door sections 12A to 12F with different movement amounts (opening and closing strokes) during opening and closing control. Specifically, there are three types: a "large door" with a large movement amount (opening and closing stroke) during opening and closing control, a "middle door" with a medium movement amount (opening and closing stroke), and a "small door" with a small movement amount (opening and closing stroke). In this modified example, the combination of the door section 12A of the platform fence 10A and the door section 12F of the platform fence 10F, which are "small doors" with the same movement amount (opening and closing stroke), is the first door section and the second door section. Also, the combination of the door section 12B of the platform fence 10B and the door section 12E of the platform fence 10E, which are "large doors" with the same movement amount (opening and closing stroke), is the first door section and the second door section.

(C) Platform fence 10
The platform fence monitored by the platform fence status monitoring device 1 is a movable platform fence, and can be similarly applied to, for example, a lift-up type platform fence.

(D) Acquisition of motor current value In the above embodiment, the platform fence state monitoring device 1 acquires the motor current value measured by the current sensor 30 directly from the current sensor 30, but may acquire the motor current value via the control device 20. That is, the motor current value measured by the current sensor 30 is output to the control device 20, and the motor current value is accumulated and stored in the control device 20 as data associated with the measurement date and time. Then, at a predetermined timing, such as after the end of a day's operation, the platform fence state monitoring device 1 acquires the motor current value data accumulated and stored in the control device 20 from the control device 20. As a method for acquiring the motor current value data, for example, it may be acquired by wired communication or wireless communication, or the motor current value data may be accumulated and stored in a removable recording medium and acquired by reading it from the recording medium. Furthermore, the platform fence state monitoring device 1 may acquire the motor current value data via a terminal device provided for each platform fence 10, rather than the control device 20.

In this case, furthermore, part or all of the process performed by the platform fence status monitoring device 1 to detect signs of abnormality occurring in the platform fence 10 (see FIG. 7) may be performed by another device such as the control device 20 or a terminal device provided for each platform fence 10.

LIST OF SYMBOLS 1...Platform fence state monitoring device 200...Processing unit 202...Acquisition unit 204...Detection unit 300...Storage unit 302...Platform fence state monitoring program 310...Platform fence management data 3...Platform 10 (10a, 10b)...Platform fence 11...Door pocket section 12...Door section 12a...First door section, 12b...Second door section 13...Motor 13a...First motor, 13b...Second motor 20...Control device 21...Drive control unit 22...Motor drive circuit 22a...First motor drive circuit, 22b...Second motor drive circuit 30...Current sensor 30a...First current sensor, 30b...Second current sensor

Claims (10)

an acquisition means for acquiring a first motor current waveform signal of a motor that drives a first door section and a second door section of one or more movable platform fences when the first door section and the second door section are simultaneously controlled to be opened or closed;
a detection means for detecting a symptom of an abnormality in a drive mechanism of either the first door section or the second door section by performing a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal;
Equipped with
the detection means determines whether or not a noise frequency component that satisfies a condition for inclusion is contained in each of the first motor current waveform signal and the second motor current waveform signal, and when a positive determination is made, determines that the noise frequency component is not a sign of an abnormality.
Platform fence status monitoring device. an acquisition means for acquiring a first motor current waveform signal of a motor that drives a first door section and a second door section of one or more movable platform fences when the first door section and the second door section are simultaneously controlled to be opened or closed;
a detection means for detecting a symptom of an abnormality in a drive mechanism of either the first door section or the second door section by performing a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal;
Equipped with
The detection means includes:
a noise determination means for performing a predetermined frequency analysis process on each of the first motor current waveform signal and the second motor current waveform signal to determine whether or not each of the first motor current waveform signal and the second motor current waveform signal contains a noise frequency component that satisfies a predetermined frequency coincidence condition;
a noise time difference determination means for determining whether or not a time difference between noise timings in the first motor current waveform signal and the second motor current waveform signal, each of which contains a noise frequency component determined to exist by the noise determination means, satisfies a predetermined allowable time difference;
and when a positive determination is made by the noise determination means and also by the noise time difference determination means, it is determined that the noise frequency component is not a sign of an abnormality.
Platform fence status monitoring device. The time difference of the noise timing is determined based on a distance between the first door portion and the second door portion.
The platform fence state monitoring device according to claim 2 . The first door portion and the second door portion are left and right door portions relating to the same opening portion.
A platform fence status monitoring device according to any one of claims 1 to 3 . The first door portion and the second door portion are door portions whose opening and closing strokes satisfy a predetermined equality condition.
A platform fence status monitoring device according to any one of claims 1 to 4 . The detection means includes:
a difference determining means for determining a difference between the first motor current waveform signal and the second motor current waveform signal;
having
The platform fence state monitoring device according to any one of claims 1 to 5 . The detection means includes:
a timing determination means for determining any one of a drive start timing, a drive state change timing, and a drive end timing (hereinafter collectively referred to as "timing") based on the first motor current waveform signal, and the timing based on the second motor current waveform signal;
having
the difference determination means determines the difference between the first motor current waveform signal and the second motor current waveform signal after achieving synchronization based on the timing determined by the timing determination means.
The platform fence state monitoring device according to claim 6 . The detection means includes:
a continuity determination means for determining continuity by integrating results of the comparison determination process for a plurality of consecutive opening/closing controls;
having
A platform fence status monitoring device according to any one of claims 1 to 7. acquiring a first motor current waveform signal of a motor that drives a first door section and a second door section of one or more movable platform fences when the first door section and the second door section are simultaneously controlled to be opened or closed;
performing a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal to detect a symptom of an abnormality related to a drive mechanism of either the first door section or the second door section;
Including,
the detecting includes determining whether or not a noise frequency component that matches a condition for inclusion is contained in each of the first motor current waveform signal and the second motor current waveform signal, and determining that the noise frequency component is not a sign of an abnormality when a positive determination is made.
A method for monitoring the status of platform fences. acquiring a first motor current waveform signal of a motor that drives a first door section and a second door section of one or more movable platform fences when the first door section and the second door section are simultaneously controlled to be opened or closed;
performing a predetermined comparison and judgment process based on the first motor current waveform signal and the second motor current waveform signal to detect a symptom of an abnormality related to a drive mechanism of either the first door section or the second door section;
Including,
The detecting comprises:
performing a predetermined frequency analysis process on each of the first motor current waveform signal and the second motor current waveform signal, and performing a noise determination to determine whether or not each of the first motor current waveform signal and the second motor current waveform signal has a noise frequency component that satisfies a predetermined frequency coincidence condition;
performing a noise time difference determination for determining whether or not a time difference between noise timings in the first motor current waveform signal and the second motor current waveform signal, each of which contains a noise frequency component determined to exist by the noise determination, satisfies a predetermined allowable time difference;
determining that the noise frequency component is not a sign of an abnormality when the noise determination and the noise time difference determination are both positive;
Including,
A method for monitoring the status of platform fences.

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