Condition monitoring device and condition monitoring method

Abstract

To enable the assessment of the overall structural integrity of multiple movable platform screen doors installed in a series. [Solution] Multiple movable platform screen doors 10 are powered from a common power supply point. The status monitoring device 1 acquires measured values ​​of the supply voltage supplied to each movable platform screen door 10 from each movable platform screen door 10, and based on the measured values, determines whether the door portion of the movable platform screen door 10 is in an operating state where it is opening and closing, or in a non-operating state where it is not opening or closing, and determines the overall health of the multiple movable platform screen doors 10 as a whole based on the status determination result and the time-series change of the measured values.

Description

Technical Field

[0001] The present invention relates to a condition monitoring device and the like.

Background Art

[0002] In a movable home gate, a method of detecting an abnormality or its sign using measured values such as the current and voltage of a motor that drives a door portion is known. For example, a method of detecting an abnormal load during the opening and closing operation of the door portion by utilizing the fact that the load applied to the motor varies according to the movement of the door portion (for example, Patent Document 1), or a method of diagnosing the soundness of a movable home gate from a feature amount representing the fluctuation characteristics of time-series data of measured values such as motor current, motor voltage, torque, and rotational speed (for example, Patent Document 2), and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the above-described conventional methods use measured values such as the current and voltage of a motor, they are inevitably methods targeted at the opening and closing operation of the door portion. However, the monitoring targets of a movable home gate include not only abnormalities related to the motor and the drive mechanism of the door portion but also other abnormalities such as the motor control board and the power supply system, and constant monitoring is required not only during the opening and closing operation of the door portion but also at all times.

[0005] Furthermore, while various technologies are known for monitoring abnormalities in individual platform screen doors, platform screen doors are never installed individually on a platform. Multiple platform screen doors are installed in a series. Therefore, instead of individually determining abnormalities in each platform screen door, if the overall health of the entire series of platform screen doors can be determined, it becomes possible to create a hierarchical structure for monitoring targets and levels, thereby achieving more efficient monitoring.

[0006] The problem that this invention aims to solve is to enable the determination of the overall integrity of multiple movable platform screen doors installed in a series. [Means for solving the problem]

[0007] The first invention for solving the above problem is: A condition monitoring device for monitoring the status of multiple movable platform gates installed in a series at the side end of a platform, The aforementioned multiple movable platform screen doors are powered from a common power supply point. A measurement value acquisition means (for example, the measurement value acquisition unit 202 in Figure 8) acquires a measured value of one of the supply voltage, supply current, or supply power supplied to each of the aforementioned movable platform gates, The state of the door portion of the movable platform screen door includes a state determination means (for example, the state determination unit 204 in Figure 8) that determines at least two states: an operational state in which opening and closing operations are being performed, and a non-operational state in which opening and closing operations are not being performed. Based on the determination result of the state determination means and the time-series change of the measured value, an overall health determination means (for example, the overall health determination unit 206 in Figure 8) determines the overall health, which is the health of the entire set of movable platform screen doors, This is a condition monitoring device equipped with [specific features / features].

[0008] Other inventions include, A condition monitoring method for monitoring the condition of multiple movable platform gates installed in a series at the side end of a platform, The aforementioned multiple movable platform screen doors are powered from a common power supply point. From each of the aforementioned movable platform screen doors, obtain a measured value of one of the following: supply voltage, supply current, or supply power supplied to the movable platform screen door. The state of the door section of the aforementioned movable platform screen door is determined to be at least between an operating state where it is being opened or closed, and a non-operating state where it is not being opened or closed. Based on the results of the determination of the aforementioned state and the time-series changes of the measured values, the overall soundness, which is the soundness of the entire set of movable platform screen doors, is determined. A status monitoring method including this may be configured.

[0009] According to the first invention, it becomes possible to determine the overall integrity of multiple movable platform screen doors installed in a series. Furthermore, the integrity of the entire series of movable platform screen doors can be determined regardless of whether the doors are in operation or not. Specifically, multiple movable platform screen doors installed in a series are often powered from a common power supply point. Therefore, the integrity of the entire series of movable platform screen doors can be determined based on the state of the doors (whether they are in operation or not) and the time-series changes in any of the measured values ​​of the supply voltage, supply current, or supply power supplied to each movable platform screen door from the common power supply point.

[0010] The second invention is, in the above invention, The state determination means further determines the transition state between the operating state and the non-operating state. It is a status monitoring device.

[0011] According to the second invention, it is possible to determine the transition state between the operating state and the non-operating state as the state of the door portion of the movable platform screen door.

[0012] The third invention is, in the above invention, The overall health determination means determines the overall health based on the time-series changes of the measured values ​​for each state based on the determination result. It is a state monitoring device.

[0013] According to the third invention, since the power supply situation to each movable home fence supplied from a common power supply point differs depending on states such as an operating state, a non-operating state, and a transition state, it is possible to appropriately determine the soundness of the plurality of movable home fences as a whole based on the time-series change of the measured values for each state.

[0014] The fourth invention is in the above-described invention, the overall soundness determination means performs predetermined statistical processing based on the data of the time-series change of the measured values for each state, and determines the overall soundness for each state. It is a state monitoring device.

[0015] According to the fourth invention, it is possible to capture the characteristics of the time-series change of the measured values for each state by statistical processing. As a result, it becomes possible to simply and appropriately determine the soundness of the plurality of movable home fences as a whole.

[0016] The fifth invention is in the above-described invention, the overall soundness determination means determines the presence or absence of an abnormal sign as the overall soundness, and when it is determined by the overall soundness determination means that there is an abnormal sign, a cause speculation means (for example, the cause speculation unit 210 in FIG. 8) that speculates a cause according to the determined state. It is a state monitoring device further comprising the above.

[0017] According to the fifth invention, for example, since the operating situation of each element constituting the movable home fence differs depending on the state, such as a motor that drives a door portion operates in an operating state and stops in a non-operating state, it is possible to speculate the cause according to which state is determined to have an abnormal sign (not sound).

[0018] The sixth invention is in the above-described invention, When the state determined to have an abnormal sign is the non - operating state, the cause speculation means speculates that either an abnormal sign of any one of the motor control units of the plurality of movable home barriers or an abnormal sign of the power supply is the cause. It is a state monitoring device.

[0019] According to the sixth invention, when the state determined to have an abnormal sign is the non - operating state, it is possible to speculate that either an abnormal sign of any one of the motor control units of the plurality of movable home barriers or an abnormal sign of the power supply itself is the cause of the abnormal sign for the entire plurality of movable home barriers.

[0020] The seventh invention is in the above - mentioned invention, The movable home barrier has a circuit configuration that supplies a driving power supply to the motor driving the door portion via a smoothing capacitor, When the state determined to have an abnormal sign is the operating state, the cause speculation means speculates that an abnormal sign of any one of the smoothing capacitors related to the plurality of movable home barriers is the cause. It is a state monitoring device.

[0021] According to the seventh invention, since the driving power is supplied to the motor via the smoothing capacitor, when the state determined to have an abnormal sign is the operating state, it is possible to speculate that an abnormal sign of the smoothing capacitor is the cause of the abnormal sign for the entire plurality of movable home barriers.

[0022] The eighth invention is in the above - mentioned invention, The overall soundness determination means determines the presence or absence of an abnormal sign as the overall soundness, When it is determined by the overall soundness determination means that there is an abnormal sign, an individual soundness determination means (for example, the individual soundness determination unit 208 in FIG. 8) that determines the soundness of each individual movable home barrier based on the time - series change of the measured value, It is a state monitoring device further comprising.

[0023] According to the eighth invention, when abnormal signs are detected for the entire set of multiple platform screen doors, the platform screen doors exhibiting abnormal signs can be identified by individually determining the soundness of each platform screen door. [Brief explanation of the drawing]

[0024] [Figure 1] Examples of applications for condition monitoring devices. [Figure 2] Configuration diagram of the control unit. [Figure 3] A diagram illustrating the operation of the control unit in a non-operating state. [Figure 4] Equivalent circuit of a movable platform screen door in a non-operating state. [Figure 5] An example of explaining the operation of a control unit while it is running. [Figure 6] Equivalent circuit of a movable platform screen door in operation. [Figure 7] An example of a voltage waveform. [Figure 8] Example of a functional configuration for a status monitoring device. [Modes for carrying out the invention]

[0025] Preferred embodiments of the present invention will be described below with reference to the drawings. However, the applicable forms of the present invention are not limited to the embodiments described below. Furthermore, in the drawings, the same elements are denoted by the same reference numerals.

[0026] Figure 1 shows an example of the application of the condition monitoring device in this embodiment. The condition monitoring device 1 in this embodiment is a device that monitors the condition of a plurality of movable platform gates 10 installed in a series at the side end of a platform. The movable platform gates 10 are supplied with power from a power source, which is the power supply point, via a power distribution line 3, through a power branching section 5 provided according to the installation position of the movable platform gates 10.

[0027] In the example shown in Figure 1, movable platform screen doors 10 are installed corresponding to each opening that serves as a boarding and alighting point for the train. Each movable platform screen door 10 has a pair of movable doors on the left and right that open and close the corresponding opening. In Figure 1, a simplified representation shows a configuration in which four movable platform screen doors 10a to 10d, corresponding to four openings (openings 1 to 4), are arranged in a series on the platform. These movable platform screen doors 10a to 10d are controlled to open and close simultaneously. Note that in Figure 1, for ease of understanding, there appears to be a gap between adjacent movable platform screen doors 10, but in reality there is no gap. Instead, the door pockets for extending and retracting the doors are arranged adjacent to each other, or other units are arranged between the door pockets.

[0028] Furthermore, the movable platform screen door 10 has a control unit 20 for controlling the opening and closing of the door section. The control unit 20 is supplied with operating power from the power distribution line 3's power branch 5. The power distribution line 3 is provided with four power branch 5a to 5d, corresponding to each of the movable platform screen doors 10a to 10d, in order of furthest from the power source (AC power) which is the power supply point.

[0029] Furthermore, the movable platform screen door 10 is equipped with voltage sensors 12 (12a~12d) that measure the supply voltage from the power distribution unit 5 to the control unit 20. The status monitoring device 1 acquires the measured value (voltage value) V of the supply voltage from the voltage sensors 12 to the movable platform screen door 10, and monitors the status of the status monitoring device 1 based on the acquired measured value (voltage value) V.

[0030] Figure 2 shows the configuration of the control unit 20. As shown in Figure 2, the control unit 20 includes a full-wave rectifier circuit 21 that rectifies the supply voltage from the power distribution unit 5, a smoothing capacitor 22 that maintains a constant voltage supply to the motor driver circuit 23, motors 24 that open and close each of the left and right pair of doors, motor driver circuits 23 that drive the left and right door motors 24 respectively, a step-down circuit 25 that steps down the voltage after full-wave rectification by the full-wave rectifier circuit 21 to the operating voltage of the motor control board 26, and a motor control board 26 which is a motor control unit that controls the motor driver circuit 23. In other words, the motor driver circuit 23 and the motor control board 26, which are the recipients of the power supply from the power distribution unit 5, are connected in parallel.

[0031] The condition monitoring device 1 determines the health of the movable platform gate 10 based on the voltage value (measured supply voltage) V obtained from the movable platform gate 10. The health determination is made by distinguishing between the operating state in which the gate portion of the movable platform gate 10 is opening and closing, the non-operating state in which it is not opening and closing, and the transitional state between the operating state and the non-operating state. Whether it is in the operating state, non-operating state, or transitional state can be determined, for example, from the voltage value V of the movable platform gate 10, as will be described later.

[0032] The health of each movable platform screen door 10 is determined by comparing the voltage waveform (voltage value V) of each movable platform screen door 10 in each state (operating state, non-operating state, transition state) with a reference waveform, which is the voltage waveform under normal conditions, to see if the voltage value and its behavior deviate from (are not diverging from) normal behavior. If some abnormality occurs in a movable platform screen door 10 and the voltage value V of that movable platform screen door 10 changes, a difference will occur between the voltage waveform showing the behavior of the voltage value V and the reference waveform. The health of the movable platform screen door 10 is determined based on this difference.

[0033] Specifically, voltage waveform data, which is the voltage value V acquired for each movable platform screen door 10 over a fixed time interval (approximately a few seconds), is compared with pre-prepared reference data. The reference data is voltage waveform data acquired over the same time interval when the movable platform screen door 10 is functioning normally, and is prepared for each state.

[0034] One method for comparing voltage waveform data with reference data is statistical processing using the Mahalanobis distance. The Mahalanobis distance is smaller the closer the voltage waveform data is to the reference data, and larger the further it is from the reference data. Alternatively, an image matching method can be used, where both the voltage waveform data and the reference data are graphed, and the similarity (degree of agreement) between the two images is calculated. The similarity is larger the closer the voltage waveform data is to the reference data, and smaller the further it is from the reference data. Using these methods, the degree of difference in the behavior of the voltage value V compared to normal conditions can be determined numerically. Then, depending on whether or not this numerical value meets a predetermined threshold condition, it is possible to notify an external party that some kind of anomaly has occurred.

[0035] The comparison between voltage waveform data and reference data is preferably performed using a single group of voltage waveform data and reference data that combines the voltage values ​​V (V1 to V4) for all movable platform screen doors 10 (10a to 10d). This allows for the determination of the overall health of all multiple movable platform screen doors 10, such as whether any of the movable platform screen doors 10 (10a to 10d) are not in good condition.

[0036] Alternatively, one voltage waveform data and reference data may be generated for each movable platform screen door 10 (10a to 10d), and the voltage waveform data and reference data may be compared for each movable platform screen door 10. In this case, the individual health of each movable platform screen door 10 can be determined. In this embodiment, an overall health determination is performed on all of the multiple movable platform screen doors 10, and if an abnormality is detected (not healthy), an individual health determination is performed.

[0037] Figure 3 illustrates the operation of the control unit 20 when the movable platform screen door 10 is in a non-operating state. In the non-operating state, when the door section is not opening or closing, the motor 24 is stopped and no driving power is supplied to the motor 24. However, the motor control board 26 is supplied with operating power and is operating, and outputs a stop instruction signal to the motor driver circuit 23 to stop the opening and closing operation of the door section. In other words, as shown by the thin arrows in Figure 3, current flows sequentially from the power branching section 5 to the full-wave rectifier circuit 21, the step-down circuit 25, and the motor control board 26.

[0038] Figure 4 shows the equivalent circuit of the entire movable platform screen doors 10a to 10d when they are in a non-operating state. In the non-operating state, as shown in Figure 3, the motor driver circuit 23 and motor 24 are stopped, so the equivalent impedance RnU (R1U to R4U) of the control unit 20 can be considered to correspond to the impedance of the motor control board 26 calculated from the current consumption of the motor control board 26 when it is in a non-operating state. In addition, the impedance of the power distribution line 3 is the cable impedance R1 to R4, which is a lumped constant between the power branching sections 5a to 5b and the power supply points.

[0039] In other words, the equivalent circuit of the entire movable platform screen doors 10a to 10d, including the power supply system, is a series circuit of the cable impedances R1 to R4 of the power distribution line 3, with the equivalent impedances R1U to R4U of the control units 20 of the movable platform screen doors 10 connected in parallel from the power distribution branch sections 5a to 5d of the power distribution line 3. The potentials V1 to V4 of the power distribution branch sections 5a to 5d (the voltage supplied to the control units 20a to 20d) decrease as you move away from the power supply point due to the voltage drop caused by the cable impedances R1 to R4.

[0040] Figure 5 is a diagram illustrating the operation of the control unit 20 when the movable platform screen door 10 is in operation. When the door is in operation and opening and closing, drive power is supplied to the motor driver circuit 23 via the smoothing capacitor 22, and the motor 24 operates. The motor control board 26 is also supplied with power and operates, outputting an open command signal or a close command signal to the motor driver circuit 23 to open or close the door.

[0041] In other words, as shown by the thin arrows in Figure 5, current flows from the power supply branching section 5 in order to the full-wave rectifier circuit 21, the step-down circuit 25, and the motor control board 26. At the same time, as shown by the thick arrows, current (motor current) flows from the full-wave rectifier circuit 21 in order to the smoothing capacitor 22, the motor driver circuit 23, and the motor 24.

[0042] Figure 6 shows the equivalent circuit of the entire movable platform screen doors 10a to 10d when they are in operation. When they are in operation, as shown in Figure 5, operating power is supplied to the motor control board 26 and driving power is supplied to the motor driver circuit 23 and the motor 24 is in operation. The impedance of the motor 24, which is an inductive load, is small compared to the impedance of the motor control board 26. Therefore, the impedance of the control unit 20 when it is in operation can be considered to be equivalent to the impedance of the motor 24, and the impedance of the motor control board 26 can be ignored.

[0043] Also, similar to Figure 4, the impedance of the power distribution line 3 is the cable impedance R1 to R4, which is a lumped constant between the power branching sections 5a to 5d and each power source that serves as the power supply point. In operation, the smoothing capacitor 22 of each movable platform gate 10 is charged by the power supplied from the power source, and the discharge of the smoothing capacitor 22 supplies driving power to the motor 24, resulting in a charge-discharge operation.

[0044] If the load on the opening and closing operation of the doors of each movable platform screen door 10 is approximately the same, then the drive power supplied to the motor 24 will be approximately the same for each movable platform screen door 10, and therefore the voltage of the smoothing capacitor 22 of each movable platform screen door 10 will be approximately equal. As a result, the potentials (supply voltages to the control unit 20) V1 to V4 of all power branching points 5a to 5d will be approximately equal (nearly the same potential).

[0045] Figure 7 shows examples of waveforms of the measured voltage values ​​(V1-V4) supplied to the movable platform screen doors 10a-10d, corresponding to the first to fourth openings, respectively. The horizontal axis represents time, and the vertical axis represents the voltage value [Vrms], showing the voltage waveform when the movable platform screen doors 10 are functioning normally. It also shows the waveform during the period from the non-operating state T1, where the gate is closed and stopped, to the operating state T2, where the gate is opening, and then back to the non-operating state T3, where the gate is open and stopped.

[0046] First, the voltage waveforms in the non-operating states T1 and T3 are almost constant, although they fluctuate slightly. Also, the voltage values ​​differ for each opening. Specifically, the voltage values ​​are lower in the order of the first to fourth openings (movable platform screen doors 10a to 10d), which are furthest from the power source. As explained with reference to Figure 4, this is due to the voltage drop caused by the cable impedances R1 to R4 from the power source to each power branch 5a to 5d. Therefore, the voltage drop is greater for openings farther from the power source (movable platform screen doors 10), resulting in relatively lower voltages.

[0047] In non-operating states T1 and T3, the motor 24 is not supplied with driving power and has stopped operating, the smoothing capacitor 22 is not discharged and is in a charged state, and only the motor control board 26 is operating. Therefore, in non-operating states T1 and T3, it is possible to determine the health of the motor control board 26 and the health of the power supply.

[0048] If any abnormality occurs in the motor control board 26 of a certain opening (movable platform screen door 10), the fluctuation (ripple) of the voltage value V at that opening will increase. Also, if the voltage of the power supply, which is the power supply point, fluctuates, the voltage value V at all openings will fluctuate almost uniformly. As a result, if the fluctuation (ripple) of the voltage value V at a particular opening increases, it can be inferred that some kind of abnormality has occurred in the movable platform screen door 10 at that opening. Furthermore, if the voltage value V at all openings fluctuates, if the voltage value V is within a predetermined range (for example, 200V ± 10%), it can be inferred that there is no abnormality but that the power supply voltage has fluctuated. If it exceeds the predetermined range, it can be inferred that some kind of abnormality has occurred in the power supply.

[0049] Furthermore, it is possible to detect abnormalities related to power supply, such as an increase in cable impedance due to an anomaly in the power distribution line 3. Since each of the movable platform gates 10a to 10d is sequentially powered by the power distribution line 3 from a common power source, for example, if the voltage value V of the movable platform gates 10d and 10c, which are close to the power source, does not fluctuate, but the voltage value V of the movable platform gates 10b and 10a, which are far from the power source, fluctuates, it can be determined that some kind of abnormality has occurred in the power distribution line 3 between the movable platform gates 10c and 10b.

[0050] Furthermore, since the voltage value V is constant in the non-operating states T1 and T3, it is possible to determine any abnormalities caused by the opening and closing operation of the door section of the movable platform screen door 10 during the non-operating states T1 and T3 by comparing the voltage waveforms in each state.

[0051] Furthermore, in the operating state T2, as shown in Figure 6, the power supply branching sections 5a to 5d are at the same potential, so the voltage values ​​V1 to V4 at each opening have approximately equal voltage waveforms. Also, as the motor 24 operates and the door opens and closes, the voltage values ​​V1 to V4 fluctuate according to the load involved in the opening and closing operation. Under normal conditions, the voltage across the smoothing capacitor 22 is approximately equal at all openings, but if the smoothing capacitor 22 deteriorates, fluctuations (ripples) occur in the voltage value V at the corresponding opening, and further deterioration causes the voltage value V to decrease. Therefore, the health of the smoothing capacitor 22 can be determined based on the voltage waveform in the operating state T2.

[0052] Furthermore, since the doors of each opening are controlled to perform the same opening and closing operation, the soundness of the drive mechanism of the door of each opening (movable platform screen door 10) by the motor 24 can be determined by comparing the voltage waveforms of each opening.

[0053] Furthermore, during transition states T4 and T5 between the non-operating state and the operating state, the smoothing capacitor 22 is charged or discharged by the current (motor current) flowing toward the motor driver circuit 23.

[0054] The transition state T4 from the non-operating state T1 to the operating state T2 is the state in which the motor 24 is started and power supply has begun. When power supply to the motor 24 begins, current flows from the smoothing capacitor 22 to the motor 24, and the impedance seen from the power supply side becomes dominated by the impedance of the smoothing capacitor 22. In other words, discharge occurs from the smoothing capacitor 22 to the motor 24 in accordance with the motor load related to the opening and closing operation of the door section, and the smoothing capacitor 22 is charged from the power supply side. Therefore, the voltage value V at each opening becomes the voltage of the smoothing capacitor 22. If the load related to the opening and closing operation of the movable platform gate 10 at each opening is approximately the same, the voltage value V at each opening will fluctuate toward approximately equal voltage values.

[0055] However, if the load related to the opening and closing operation of the door increases, the voltage value V decreases due to the increase in the inrush current of the motor 24. Also, if the smoothing capacitor 22 deteriorates, the voltage value V decreases due to the decrease in capacitance, and the charging and discharging operation time shortens. Furthermore, if there is a malfunction in the motor 24, the voltage value decreases because the current flowing from the smoothing capacitor 22 to the motor 24 decreases.

[0056] Furthermore, the transition state T5 from the operating state T2 to the non-operating state T3 is the state in which the motor 24 stops operating and the power supply is cut off. When the power supply to the motor 24 is cut off, charging of the smoothing capacitor 22 from the power supply side stops, and the impedance seen from the power supply side becomes dominated by the impedance of the motor control board 26. As a result, the voltage values ​​V1 to V4 at each opening fluctuate toward the voltage value corresponding to the distance from the power supply to the power branch section 5a to 5d of the corresponding opening (the voltage value in the non-operating state T3).

[0057] Based on these findings, the health of the motor 24 and the smoothing capacitor 22 can be determined based on the voltage waveforms in transition states T4 and T5.

[0058] Furthermore, since the time from transition state T4 to transition state T5 corresponds to the time required from the start to the end of the door opening operation, it is possible to determine any abnormalities related to the opening and closing operation of the door from this time.

[0059] Whether a movable platform screen door 10 is operating or not can be determined, for example, from the fluctuation of the measured value (voltage value) of the movable platform screen door 10. That is, as shown in Figure 7, the voltage value fluctuates significantly when transitioning between the operating and non-operating states. In particular, the closer the movable platform screen door 10 is to the power source, the greater the difference in voltage value between the operating and non-operating states. Also, in the non-operating state, the voltage value differs for each movable platform screen door 10, but in the operating state, the voltage value of each movable platform screen door 10 is almost the same. From these points, it is possible to determine whether each movable platform screen door 10 is operating or not from its voltage value.

[0060] Figure 8 shows an example of the functional configuration of the status monitoring device 1. As shown in Figure 8, the status monitoring device 1 comprises an operation unit 102, a display unit 104, an audio output unit 106, a communication unit 108, a processing unit 200, and a storage unit 300, and is configured as a type of computer system.

[0061] The operation unit 102 is implemented by an input device such as a button switch or a touch panel, and outputs an operation signal to the processing unit 200 according to the operation performed. The display unit 104 is implemented by a display device such as an LCD (Liquid Crystal Display) or a touch panel, and displays various information according to the display signal from the processing unit 200. The audio output unit 106 is implemented by an audio output device such as a speaker, and outputs various audio information according to the audio signal from the processing unit 200. The communication unit 108 is implemented by a wireless or wired communication device, and communicates with external devices such as the voltage sensor 12 of the movable platform screen door 10 via a given communication network.

[0062] The processing unit 200 is implemented by an arithmetic unit such as a CPU (Central Processing Unit), and based on programs and data stored in the storage unit 300, it issues instructions and transfers data to each part that makes up the status monitoring device 1, thereby performing overall control of the status monitoring device 1.

[0063] Furthermore, the processing unit 200 performs the process of monitoring the status of multiple movable platform fences 10 installed in a series at the side end of the platform by executing a status monitoring program 302 stored in the storage unit 300. The processing unit 200 has, as functional processing blocks, a measurement value acquisition unit 202, a status determination unit 204, an overall health determination unit 206, an individual health determination unit 208, a cause estimation unit 210, and a notification control unit 212. Each of these functional units of the processing unit 200 can be implemented in software by the processing unit 200 executing a program, or by a dedicated calculation circuit. In this embodiment, the former, software implementation, will be described.

[0064] The measurement value acquisition unit 202 acquires the measured value of the supply voltage supplied to each of the movable platform gates 10 from each of the movable platform gates 10.

[0065] Specifically, the measured value (voltage value) from the voltage sensor 12 installed on the movable platform gate 10 is acquired via the communication unit 108. The acquired measured value (voltage value) is stored as measured value data 330 for each movable platform gate 10.

[0066] The state determination unit 204 determines at least two states of the door portion of the movable platform screen door 10: an operating state in which opening and closing operations are being performed, and a non-operating state in which opening and closing operations are not being performed. Furthermore, it determines the transition state between the operating state and the non-operating state.

[0067] Specifically, based on the measured values ​​acquired by the measurement value acquisition unit 202, the system determines whether the movable platform gate 10 is in an operating state or a non-operating state by noting that the measured values ​​(voltage values) fluctuate significantly when the movable platform gate 10 transitions between an operating state and a non-operating state, and that while the variation in the measured values ​​(voltage values) of each movable platform gate 10 is small in the operating state, the variation in the measured values ​​(voltage values) of each movable platform gate 10 is large in the non-operating state. Alternatively, the determination of whether the movable platform gate 10 is in an operating state or a non-operating state may also be made based on the signals that control the opening and closing of the movable platform gate 10.

[0068] The overall health determination unit 206 determines the overall health of the multiple movable platform screen doors 10 based on the determination results of the state determination unit 204 and the time-series changes in the measured values. For example, it determines the overall health based on the time-series changes in the measured values ​​for each state based on the determination results. Furthermore, it performs predetermined statistical processing based on the data of the time-series changes in the measured values ​​for each state to determine the overall health for each state. It also determines whether or not there are signs of abnormality as part of the overall health.

[0069] Specifically, the voltage waveform of each movable platform gate 10 in the operating state, non-operating state, and transition state is compared with a reference waveform, which is the voltage waveform under normal conditions, to determine whether the behavior of the voltage value deviates from (is not deviating from) the behavior under normal conditions.

[0070] Specifically, voltage waveform data, which is data of the voltage value V acquired for each movable platform gate 10 over a fixed time interval (approximately a few seconds), is compared with pre-prepared reference data. The reference data is voltage waveform data acquired over the same time interval when the movable platform gate 10 is functioning normally, and is pre-prepared as overall health determination data 310 for each state. The overall health determination data 310 has reference data for each state: non-operating state, operating state, and transition state. The reference data for the transition state has reference data for the transition state from non-operating state to operating state, and for the transition state from operating state to non-operating state.

[0071] The comparison between voltage waveform data and reference data is performed using a single group of voltage waveform data and reference data that combines the voltage values ​​V (V1 to V4) for all movable platform screen doors 10 (10a to 10d). This allows for the determination of the overall health of all movable platform screen doors 10 (10a to 10d), that is, whether any of them are not healthy.

[0072] Furthermore, statistical processing using the Mahalanobis distance can be used as a method for comparing voltage waveform data with reference data. The Mahalanobis distance is smaller the closer the voltage waveform data is to the reference data, and larger the further it is from the reference data. Alternatively, an image matching method can be used, in which the voltage waveform data and the reference data are each converted into graph images, and the similarity (degree of agreement) between the two images is calculated. The similarity is larger the closer the voltage waveform data is to the reference data, and smaller the further it is from the reference data. Using these methods, the degree of difference in the behavior of the voltage value V compared to the normal state can be determined numerically. Then, depending on whether or not this numerical value meets a predetermined threshold condition, it is possible to determine whether the entire set of movable platform screen doors 10 is healthy or shows signs of abnormality (is not healthy). Furthermore, for the non-operating state, it is preferable to set the threshold condition in two stages. In other words, there are two threshold conditions: a first threshold condition for inferring that the voltage value is fluctuating but within a predetermined range (e.g., 200V ± 10%) and therefore not an abnormality; and a second threshold condition for inferring that the voltage value fluctuation exceeds the predetermined range and therefore indicates a power supply abnormality.

[0073] The individual health determination unit 208 determines the health of individual movable platform gates 10 based on the time-series changes in measured values ​​when the overall health determination unit 206 determines that there are signs of an abnormality in the overall health.

[0074] Specifically, for each movable platform screen door 10 (10a to 10d), one voltage waveform data and reference data are prepared individually, and the voltage waveform data and reference data are compared for each movable platform screen door 10. The reference data is prepared in advance as individual health determination data 320. Individual health determination data 320 is prepared for each movable platform screen door 10 and is associated with the platform screen door ID that identifies the movable platform screen door 10, and has reference data for each state: non-operating state, operating state, and transition state. The reference data for the transition state has reference data for the transition state from non-operating state to operating state and for the transition state from operating state to non-operating state.

[0075] The cause estimation unit 210 estimates the cause according to the state in which the overall health determination unit 206 determines that there are signs of an abnormality in the overall health. For example, if the state in which signs of an abnormality are determined is a non-operating state, the cause is estimated to be either a sign of an abnormality in one of the motor control boards 26 of the multiple movable platform screen doors 10 or a sign of an abnormality in the power supply. In addition, the movable platform screen doors 10 have a circuit configuration that supplies drive power to the motor 24 that drives the door section via a smoothing capacitor 22, and if the state in which signs of an abnormality are determined is an operating state, the cause is estimated to be a sign of an abnormality in one of the smoothing capacitors 22 related to the multiple movable platform screen doors 10.

[0076] Specifically, in the non-operating state, the motor 24 is not supplied with driving power and has stopped operating, but the motor control board 26 is operating. Therefore, if the voltage waveform in the non-operating state is determined to show signs of abnormality (not healthy), it is presumed that the cause is either a sign of abnormality in one of the motor control boards 26 of the multiple movable platform screen doors 10 or a sign of abnormality in the power supply.

[0077] In this case, the cause can be estimated based on the determination result by the individual health determination unit 208. That is, if a specific movable platform gate 10 among the multiple movable platform gates 10 is determined to have abnormal signs, it is presumed that the motor control board 26 of that movable platform gate 10 is showing abnormal signs, and if all movable platform gates 10 are determined to have abnormal signs, it is presumed that the power supply is showing abnormal signs.

[0078] Furthermore, during operation, drive power is supplied to the motor 24 from the power supply via the smoothing capacitor 22. Therefore, if an abnormality is detected in the voltage waveform during operation, it is presumed that the cause is an abnormality in the smoothing capacitor 22 of one of the movable platform screen doors 10. In this case, the determination result by the individual health determination unit 208 allows for the inference of which movable platform screen door 10's smoothing capacitor 22 is the cause.

[0079] The notification control unit 212 performs notification control according to the determination results of the overall health determination unit 206 and the individual health determination unit 208. Specifically, if the overall health determination unit 206 determines that there are signs of an abnormality in the overall health, it notifies the outside of the device of the determined state (non-operating state, operating state, transition state) along with the cause estimated by the cause estimation unit 210. In this case, it also notifies information about the movable platform gate 10 that the individual health determination unit 208 has determined to have signs of an abnormality. Furthermore, if it is estimated that the voltage value has fluctuated but there are no signs of a power supply abnormality, it prompts the updating of the reference data for health determination along with that fact, and updates the overall health determination data 310 and the individual health determination data 320 according to the update instruction. These notifications can be realized, for example, by displaying a message on the display unit 104, lighting a predetermined lamp, or outputting a message or warning sound from the audio output unit 106.

[0080] The storage unit 300 is implemented using a storage device such as a hard disk, ROM (Read Only Memory), or RAM (Random Access Memory). It stores programs and data for the processing unit 200 to comprehensively control the status monitoring device 1, and is also used as a workspace for the processing unit 200. Calculation results and other data executed by the processing unit 200 according to various programs are temporarily stored there. In this embodiment, the status monitoring program 302, overall health determination data 310, individual health determination data 320, and measurement value data 330 are stored.

[0081] [Effects and Effects] According to this embodiment, it is possible to determine the overall health of a series of movable platform screen doors. Furthermore, the overall health can be determined regardless of whether the doors are in operation or not. Specifically, in many cases, a series of movable platform screen doors are powered from a common power supply point. Therefore, the overall health can be determined based on the state of the doors (whether they are in operation or not) and the time-series changes in the measured values.

[0082] [Differentiation] It should be noted that the applicable embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the spirit of the invention.

[0083] In the above embodiment, the voltage supplied to the movable platform screen door 10 was measured, but the supply current may be measured, and the various judgments described above may be made based on this measured value (current value). Alternatively, both the voltage value and the current value may be used as the measured value. Or, the power may be measured and used as the measured value, or the power value obtained from the voltage value and the current value may be used as the measured value.

[0084] When the supply voltage is used as the measured value, fluctuations in the power supplied from the power source can be accurately captured, especially from fluctuations in the measured value during non-operating states. Furthermore, when the supply current is used as the measured value, the behavior of the measured value caused by abnormalities in each movable platform gate 10 during non-operating and operating states can be captured with greater accuracy compared to when the supply voltage is used as the measured value.

[0085] Furthermore, by measuring both the supply voltage and supply current, the impedance value can be calculated, and the soundness of the movable platform screen door 10 can be similarly determined based on the impedance value. [Explanation of Symbols]

[0086] 1...Condition monitoring device 200... Processing Unit 202...Measurement value acquisition unit 204... State determination unit 206…Overall soundness determination section 208…Individual soundness determination section 210…Cause estimation part 212... Notification Control Unit 300...Storage section 302...Status monitoring program 310... Data for overall health assessment 320…Data for individual health assessment 330...Measurement data 10 (10a~10d)...Movable platform screen doors 12 (12a~12d)...Voltage sensor 20 (20a~20d)... Control Unit 21...Full wave rectifier circuit 22…Smoothing capacitor 23…Motor driver circuit 24…motor 25... Step-down circuit 26…Motor control board 3…Power distribution lines 5 (5a~5d)...Power distribution section

Claims

1. A condition monitoring device for monitoring the status of multiple movable platform gates installed in a series at the side end of a platform, The aforementioned multiple movable platform screen doors are powered from a common power supply point. A measurement value acquisition means for acquiring a measured value of one of the supply voltage, supply current, or supply power supplied to each of the aforementioned movable platform gates, The state determination means for determining at least two states of the door portion of the movable platform screen door: an operating state in which it is being opened or closed, and a non-operating state in which it is not being opened or closed. A total health determination means that determines the overall health of the entire set of movable platform screen doors based on the determination result of the state determination means and the time-series change of the measured value, A condition monitoring device equipped with the following features.

2. The state determination means further determines the transition state between the operating state and the non-operating state. The status monitoring device according to claim 1.

3. The overall health determination means determines the overall health based on the time-series changes of the measured values ​​for each state based on the determination result. A condition monitoring device according to claim 1 or 2.

4. The overall health determination means performs a predetermined statistical processing based on the time-series change data of the measured values ​​for each state to determine the overall health for each state. The status monitoring device according to claim 3.

5. The overall health determination means determines whether or not there are any abnormal signs as part of the overall health, If the overall health determination means determines that there are signs of an abnormality, the cause estimation means estimates the cause according to the determined state. The condition monitoring device according to claim 4, further comprising:

6. The cause estimation means, when it is determined that there is an abnormality, infers that the cause is either an abnormality in the motor control unit of one of the multiple movable platform gates or an abnormality in the power supply. The status monitoring device according to claim 5.

7. The aforementioned movable platform screen door has a circuit configuration that supplies power to the motor that drives the door section via a smoothing capacitor, The cause estimation means, when the state in which an abnormality sign is determined to be present is the operating state, estimates the cause to be an abnormality sign in one of the smoothing capacitors relating to the plurality of movable platform fences. The status monitoring device according to claim 5.

8. The overall health determination means determines whether or not there are any abnormal signs as part of the overall health, If the overall health determination means determines that there are signs of abnormality, the individual health determination means determines the health of the individual movable platform gates based on the time-series changes of the measured values. The condition monitoring device according to claim 1 or 2, further comprising:

9. A condition monitoring method for monitoring the condition of multiple movable platform gates installed in a series at the side end of a platform, The aforementioned multiple movable platform screen doors are powered from a common power supply point. From each of the aforementioned movable platform screen doors, a measured value of one of the supply voltage, supply current, or supply power supplied to the said movable platform screen door is obtained. The state of the door section of the aforementioned movable platform screen door is determined to be at least between an operating state where it is being opened or closed, and a non-operating state where it is not being opened or closed. Based on the determination result of the aforementioned state and the time-series change of the measured value, the overall soundness, which is the soundness of the entire set of movable platform gates, is determined. A status monitoring method that includes this.

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