Door monitoring system for elevator

Abstract

Provided is a door monitoring system for an elevator, whereby travel with the door opened can be prevented by reliably monitoring the opening / closing state of the elevator car door without using an elevator control signal.　The door monitoring system for an elevator comprises a first acceleration sensor, a position sensor, and a monitoring device. The first acceleration sensor is installed on an elevator car door that opens and closes an elevator car entrance / exit provided in an elevator car room of the elevator, or the first acceleration sensor is installed on a door structure that moves integrally with the elevator car door, and the first acceleration sensor detects acceleration in the opening / closing direction of the elevator car door. The position sensor detects full closure of the elevator car door. The monitoring device monitors the opening / closing state of the elevator car door on the basis of a detection value from the first acceleration sensor during a door opening period after full closure of the elevator car door has been detected by the position sensor, without the use of a control signal for opening and closing the elevator car door.

Description

Elevator door monitoring system

[0001] The present disclosure relates to a technique for a door monitoring system that monitors the open / closed state of elevator car doors.

[0002] Patent Document 1 discloses a technology for detecting abnormalities in elevators, such as older elevators that cannot acquire elevator control signals. This technology uses at least three types of acceleration sensors to grasp the movement of the car, the opening and closing of the car doors, and the vibration of the car doors in the direction of the landing, and detects abnormalities using information obtained from these acceleration sensors.

[0003] Japanese Patent Publication No. 2019-189416

[0004] The technology of Patent Document 1 can determine the opening and closing direction of the car doors based on the time-series changes in acceleration detected by the acceleration sensor, but cannot directly detect whether the car doors are fully closed. Therefore, technology that determines the opening and closing state of the car doors using only the acceleration sensor may erroneously determine that the car doors are fully closed, and may miss the car running with the doors open.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator door monitoring system that can reliably monitor the open / closed state of the car doors and prevent the car from running with the doors open, without using elevator control signals.

[0006] The elevator door monitoring system of the present disclosure is installed on a car door that opens and closes a car entrance provided in an elevator car compartment, or on a door structure that moves integrally with the car door, and includes a first acceleration sensor that detects acceleration in the opening and closing direction of the car door, a position sensor that detects full closure of the car door, and a monitoring device that monitors the open / closed state of the car door based on the detection value of the first acceleration sensor during a door open period after the position sensor detects that the car door is fully closed, without using a control signal for opening or closing the car door.

[0007] According to the technology disclosed herein, during the door-open period after the car door is detected as fully closed, the state of the car door is monitored based on the detection value of the first acceleration sensor. This makes it possible to reliably monitor the open / closed state of the car door and prevent the car from running with the door open without using an elevator control signal.

[0008] FIG. 1 is a front view illustrating the configuration of an elevator door device according to a first embodiment. FIG. 2 is a schematic diagram illustrating an enlarged portion of the A-A cross section in FIG. 1. FIG. 3 is a block diagram of a door monitoring system according to the first embodiment. FIG. 4 is a diagram illustrating various functions of a monitoring device in the door monitoring system according to the first embodiment. FIG. 5 is a time chart illustrating an example of changes in the open / closed state of a car door monitored by the door monitoring system according to the first embodiment. FIG. 6 is a flowchart illustrating a routine executed in the door monitoring system according to the first embodiment. FIG. 7 is a diagram illustrating a modification of the hardware resources of the monitoring device. FIG. 8 is a front view illustrating features of an elevator door monitoring system according to a second embodiment. FIG. 9 is a time chart illustrating an example of changes in the open / closed state of a car door monitored by the door monitoring system according to the second embodiment. FIG. 10 is a flowchart illustrating a routine executed in the door monitoring system according to the second embodiment. FIG. 11 is a time chart illustrating an example of changes in the open / closed state of a car door monitored by the door monitoring system according to the third embodiment. FIG. 12 is a flowchart illustrating a routine executed in the door monitoring system according to the third embodiment. FIG. 13 is a front view illustrating features of an elevator door monitoring system according to a fourth embodiment. FIG. 14 is a flowchart illustrating a routine executed in the door monitoring system according to the fourth embodiment.

[0009] Hereinafter, an embodiment will be described with reference to the drawings. Note that elements common to the various drawings are given the same reference numerals and redundant explanations will be omitted.

[0010] Embodiment 1. 1-1. Configuration of an elevator door device in embodiment 1 FIG. 1 is a front view illustrating the configuration of an elevator door device in embodiment 1. An elevator shaft is formed so as to pass through each floor of a building. At each floor, a landing is formed near the shaft. A car room 4 is provided within the shaft. A landing entrance / exit is formed between each landing and the shaft. A landing door is provided at the landing entrance / exit. A car entrance / exit is formed on the landing side of the car room 4. A door device 1 is provided at the car entrance / exit. The door device 1 has a car door 2 and a door opening / closing mechanism 3 that opens and closes the car door 2.

[0011] The car doors 2 are provided to open and close the car entrance. Typically, the car doors 2 are provided in pairs so as to open from the center. As another example, the car doors 2 may be provided so as to swing out one side. A door frame 5 is fixed to the top of the car entrance. That is, the door frame 5 functions as a fixed object fixed to the car chamber 4. Various components of the door opening and closing mechanism 3 are installed on the door frame 5. The door opening and closing mechanism 3 mainly includes a suspension member 6, a hanger roller 7, a rail 8, two pulleys 9, a belt 10, a connecting member 11, and a door motor 12. The suspension member 6 is fixed to the top of the car door 2. That is, the suspension member 6 functions as a door structure that moves integrally with the car door 2. The hanger roller 7 is installed on the suspension member 6. The rail 8 is installed on the door frame 5 above the car door 2. That is, the suspension member 6 is slidably suspended on the rail 8 via the hanger roller 7. Two pulleys 9 are arranged on the door frame 5 above the rail 8 with a horizontal gap between them. A belt 10 is installed so as to go around the two pulleys 9. A door motor 12 that rotates the pulleys 9 is also provided on the door frame 5.

[0012] One end of one of the connecting members 11 is fixed to the belt 10 above the pulley 9. The other end of one of the connecting members 11 is fixed to one of the suspension members 6. The other end of the connecting member 11 is fixed to the belt 10 below the pulley 9. The other ends of both of the connecting members 11 are fixed to the other of the suspension members 6.

[0013] In such an elevator, when the car 4 is positioned adjacent to a landing, a portion of the car door 2 of the car 4 and a portion of the landing door mesh with each other. In this state, the door motor 12 is driven. This drive causes the pulley 9 to rotate. This rotation causes the belt 10 to move. At this time, the belt 10 moves to one side, left or right, above the pulley 9. Conversely, the belt 10 moves to the other side, left or right, below the pulley 9.

[0014] Accompanying this movement, the connecting members 11 move in opposite directions. Accompanying this movement, the suspension members 6 move in opposite directions. Accompanying this movement, the car doors 2 move in opposite directions. At this time, the hanger rollers 7 run on the rails 8. As a result, the car doors 2 smoothly open and close the car entrance. Accompanying this opening and closing, the pair of landing doors move in opposite directions. Due to this movement, the landing doors open and close the landing entrance.

[0015] 1-2. Configuration of the elevator door monitoring system according to the first embodiment Fig. 2 is a schematic diagram showing an enlarged portion of the A-A cross section in Fig. 1. Fig. 3 is a block diagram of the door monitoring system according to the first embodiment. Features of the elevator door monitoring system according to the first embodiment will be described below with reference to Figs. 2 and 3. The elevator according to the first embodiment is equipped with a door monitoring system 100. The door monitoring system 100 is a system that monitors the state of the car doors 2 without using a control signal for controlling the elevator. The door monitoring system 100 includes a first acceleration sensor 20, a position sensor 22, a first magnet 24, and a monitoring device 30.

[0016] The first acceleration sensor 20 is a sensor for detecting acceleration in the opening and closing direction of the car door 2. There are no limitations on the type or structure of the first acceleration sensor 20. The acceleration detected by the first acceleration sensor 20 will be referred to hereinafter as the "door opening and closing acceleration." The first acceleration sensor 20 is installed on a suspension member 6, which is a door structure that moves open and closed integrally with the car door 2. There are no limitations on the location where the first acceleration sensor 20 is installed, as long as it is installed on the car door 2 or the door structure that moves open and closed integrally with the car door. The first acceleration sensor 20 is electrically connected to the monitoring device 30 by a cable 26.

[0017] The position sensor 22 is a sensor for detecting whether the car door 2 is fully closed. There is no limitation on the type or structure of the position sensor 22. In the door monitoring system 100 of the first embodiment, the position sensor 22 is a Hall sensor that detects approach to a magnet and outputs a signal. The position sensor 22 is installed on the suspension member 6. A first magnet 24 is disposed on the door frame 5. The first magnet 24 is disposed at a position that faces the position sensor 22 at a distance when the car door 2 is in the fully closed position and is detected by the position sensor 22. As a result, the position sensor 22 outputs a position signal in response to the approach of the first magnet 24 when the car door 2 is fully closed. This position signal is hereinafter referred to as a "fully closed signal." The position sensor 22 is electrically connected to the monitoring device 30 by a cable 28.

[0018] The monitoring device 30 is a microcomputer including at least one processor 40 and at least one storage device 50. The monitoring device 30 is also called an information processing device. The monitoring device 30 is installed on the suspension member 6.

[0019] The storage device 50 stores a monitoring program 52 and various data 54 related to the monitoring program 52. The processor 40 includes a CPU (Central Processing Unit). The processor 40 reads and executes the monitoring program 52 to realize various functions of the monitoring device 30. The monitoring program 52 may be recorded on a computer-readable recording medium.

[0020] 4 is a diagram for explaining various functions of the monitoring device of the door monitoring system according to Embodiment 1. As shown in this diagram, the monitoring device 30 includes, as its functional blocks, an input processing unit 31, a door open period determination unit 32, and a door state calculation unit 33.

[0021] The input processing unit 31 is a functional block for receiving the door opening / closing acceleration detected by the first acceleration sensor 20 and the position signal detected by the position sensor 22. This processing will be referred to hereinafter as "input processing." The door-open period determination unit 32 is a functional block for determining the start and end times of the door-open period of the car door 2 based on information input by the input processing. This processing will be referred to hereinafter as "door-open period determination processing." Note that the "door-open period" here refers to the period from when the fully closed car door 2 starts to open until it is fully closed again.

[0022] The door state calculation unit 33 is a functional block for calculating the state of the car door 2 based on the door opening / closing acceleration during the door opening period of the car door 2, and storing the calculated state in the data 54 area of ​​the storage device 50. This processing is hereinafter referred to as "calculation processing." Note that the state of the car door 2 here includes the door opening / closing acceleration, door opening / closing speed, and door opening / closing position of the car door 2. In the calculation processing, the door opening / closing speed is calculated by performing an integration process on the door opening / closing acceleration. Furthermore, the door opening / closing position is calculated by performing an integration process on the door opening / closing speed.

[0023] 1-3. Operation of the elevator door monitoring system according to the first embodiment Next, the operation of the elevator door monitoring system 100 according to the first embodiment will be described.

[0024] The monitoring device 30 can calculate changes in the door opening / closing speed and the door opening / closing position using changes in the door opening / closing acceleration detected by the first acceleration sensor 20. However, the first acceleration sensor 20 cannot directly detect the door opening / closing position of the car door 2. Therefore, if the calculation process is continued, the effects of calculation errors and disturbance errors may gradually accumulate, which may lead to an erroneous determination of the door opening / closing position. Furthermore, if the opening / closing movement of the car door 2 is temporarily stopped at a position other than the fully closed position due to, for example, a foreign object or the like being caught in the car door 2, the monitoring device 30 may erroneously determine that the car door 2 is in the fully closed state.

[0025] Therefore, the door monitoring system 100 of the first embodiment is equipped with a position sensor 22 that detects the full closure of the car door 2. The monitoring device 30 can accurately determine the door opening start time from the full closure of the car door 2 in the door open period determination process using the position signal of the position sensor 22. Therefore, in the calculation process, the monitoring device 30 can accurately calculate the door opening / closing speed and door opening / closing position during the door open period based on the change in the door opening / closing acceleration from the full closure of the car door 2. This allows the door monitoring system 100 to monitor the state of the car door 2 without using an elevator control signal.

[0026] 1-4. Specific example of change in the open / closed state of the car door Figure 5 is a time chart showing an example of change in the open / closed state of the car door monitored by the door monitoring system of embodiment 1. In Figure 5, (A) represents change in the position signal of the position sensor 22, (B) represents change in the door opening / closing acceleration calculated from the detection value of the first acceleration sensor 20, (C) represents change in the door opening / closing speed obtained by integrating the door opening / closing acceleration, and (D) represents change in the door opening / closing position obtained by further integrating the door opening / closing speed.

[0027] In the example shown in FIG. 5 , the door-open period determination unit 32 determines the period from time t1, when the fully-closed signal serving as a position signal switches from detection to non-detection, to time t8, when the fully-closed signal switches from non-detection to detection, as the door-open period. The door state calculation unit 33 executes calculation processing during the determined door-open period to calculate the state of the car door 2. In the example shown in FIG. 5 , the door-opened position of the car door 2 moves in the door-opening direction during the period from time t1 to time t4. Since the door-opening acceleration and the door-opening speed are zero during the period from time t4 to time t5, the door-opened position is maintained constant in the open state. Then, during the period from time t5 to time t8, the door-opened position of the car door 2 moves in the door-closing direction, and at time t8, the car door 2 is fully closed. As such, the door monitoring system 100 of embodiment 1 makes it possible to monitor the state of the car door 2 during the door-open period determined based on the fully-closed signal.

[0028] 1-5. Specific Processing Executed in the Elevator Door Monitoring System of Embodiment 1 Next, specific processing executed in the elevator door monitoring system 100 of embodiment 1 will be described. Figure 6 is a flowchart showing a routine executed in the door monitoring system of embodiment 1. The routine shown in Figure 6 is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0029] The processing of steps S100 and S102 in the routine shown in Fig. 6 corresponds to the door-open period determination processing. Specifically, in step S100, it is determined whether the car door 2 has been detected as fully closed. Here, it is determined whether the position sensor 22 has detected a fully closed signal. As a result, if it is determined that the determination is true, the processing proceeds to step S102, and if it is not determined that the determination is true, the processing of this routine is terminated.

[0030] In step S102, it is determined whether the car door 2 has started to open. Here, it is determined whether the full-close signal detected by the position sensor 22 has changed to no detection. Alternatively, it is determined whether the door opening / closing acceleration detected by the first acceleration sensor 20 has exceeded a determination value representing door open. The determination value here is, for example, 0 or a positive value close to 0. As a result, if it is determined that the determination is successful, it is determined that the start of the door open period has arrived, and the process proceeds to step S104. On the other hand, if it is not determined that the determination is successful, the process of step S102 is repeatedly executed until it is determined that the determination is successful.

[0031] The processes of steps S104 and S106 correspond to calculation processes. Specifically, in step S104, the door opening / closing acceleration detected by the first acceleration sensor 20 is acquired by input processing. When the process of step S104 is completed, the process proceeds to the next step S106.

[0032] In step S106, the state of the car door 2 is calculated. Here, the door opening / closing acceleration, door opening / closing speed, and door opening / closing position are calculated as the state of the car door 2. The calculated state of the car door 2 is stored in the data 54 area of ​​the storage device 50. When the processing of step S106 is completed, the processing proceeds to step S108.

[0033] The processing of step S108 corresponds to door-open period determination processing. Specifically, in step S108, it is determined whether or not the car door 2 has been fully closed. Here, it is determined whether or not the fully closed signal received from the position sensor 22 has changed from non-detection to detection. As a result, if it is determined that the determination is true, it is determined that the door-open period has ended, and the processing of this routine is terminated. On the other hand, if it is determined that the determination is not true, the processing of step S104 is executed again. As a result, the processing from step S104 to step S108 is repeatedly executed until the determination of step S108 is true.

[0034] As is clear from the above description, the elevator door monitoring system 100 of the first embodiment can monitor the state of the car doors 2 without using elevator control signals.

[0035] Furthermore, since the first acceleration sensor 20, the position sensor 22, and the monitoring device 30 that constitute the door monitoring system 100 are installed on the common suspension member 6, the first acceleration sensor 20 and the position sensor 22 can be wired to the monitoring device 30 via cables 26, 28. This eliminates the need for a complex configuration such as a wireless function, simplifying the system.

[0036] The door monitoring system 100 of the first embodiment may employ the following modified aspects. Note that the following modified aspects may also be applied to the door monitoring systems of other embodiments described later.

[0037] 1-6-1. Monitoring device 30

[0038] Fig. 7 is a diagram showing a modified example of the hardware resources of a monitoring device. In the example shown in Fig. 7, the monitoring device 30 includes, for example, a processor 40, a storage device 50 as a memory, and a processing circuit 62 including dedicated hardware 60. Fig. 7 shows an example in which some of the functions of the monitoring device 30 are realized by the dedicated hardware 60. All of the functions of the monitoring device 30 may also be realized by the dedicated hardware 60. The dedicated hardware 60 may be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

[0039] The storage device 50 may be independent from the monitoring device 30, and the role of the storage device 50 may be performed by a cloud or the like.

[0040] There is no limitation on the functional arrangement of the monitoring device 30. That is, all or part of the functions of the monitoring device 30 may be installed in the first acceleration sensor 20, the position sensor 22, or a server on a cloud with which the monitoring device 30 can communicate.

[0041] The placement of the monitoring device 30 is not limited to the suspension member 6. However, if the monitoring device 30 is installed on the car door 2 or a door structure that moves open and closed integrally with the car door 2, the first acceleration sensor 20 and the position sensor 22 can be connected to the monitoring device 30 by wire.

[0042] The monitoring device 30 may transition to a power saving mode in which power consumption is reduced compared to the normal mode during the period in which it is detected that the car door 2 is fully closed. In this case, the monitoring device 30 may be configured to transition to the power saving mode when the determination in step S100 is affirmative, and to transition to the normal mode when the determination in the subsequent step S102 is affirmative.

[0043] 1-6-2. First Acceleration Sensor 20 and Position Sensor 22 The first acceleration sensor 20 and the position sensor 22 may be integrated. Alternatively, one or both of the first acceleration sensor 20 and the position sensor 22 may be integrated with the monitoring device 30.

[0044] Embodiment 2. 2-1. Features of the elevator door monitoring system in embodiment 2 Fig. 8 is a front view for explaining the features of the elevator door monitoring system in embodiment 2. In the door device shown in Fig. 8, parts that are the same as or equivalent to those in the door device 1 of embodiment 1 are given the same reference numerals and their explanations will be omitted.

[0045] The door monitoring system 100 in the second embodiment further includes a second magnet 25 in addition to the first acceleration sensor 20 , the position sensor 22 , the first magnet 24 , and the monitoring device 30 .

[0046] The position sensor 22 is a Hall sensor that detects approach to a magnet and outputs a signal. A second magnet 25 is disposed on the door frame 5. The second magnet 25 has a polarity different from that of the first magnet 24, and is disposed in a position that faces the position sensor 22 at a distance and is detected by the position sensor 22 when the car door 2 is in the fully open position. As a result, the position sensor 22 outputs a position signal that is different from the fully closed signal in response to the approach of the second magnet 25 when the car door 2 is fully open. This position signal will be referred to as a "fully open signal" hereinafter.

[0047] In the door open period determination process, the door open period determination unit 32 of the door monitoring system 100 of embodiment 2 determines, as the door open period, the period from when a fully closed car door 2 starts to open until it is fully opened, or the period from when a fully open car door 2 starts to close until it is fully closed.

[0048] Fig. 9 is a time chart showing an example of changes in the open / closed state of the car door monitored by the door monitoring system of embodiment 2. In Fig. 5, (A) represents changes in the position signal of the position sensor 22, (B) represents changes in the door opening / closing acceleration calculated from the detection value of the first acceleration sensor 20, (C) represents changes in the door opening / closing speed obtained by integrating the door opening / closing acceleration, and (D) represents changes in the door opening / closing position obtained by further integrating the door opening / closing speed.

[0049] In the example shown in this figure, the fully closed signal of the position sensor 22 is detected in the period from time t0 to time t1, the fully open signal of the position sensor 22 is detected in the period from time t4 to time t5, and the fully closed signal of the position sensor 22 is again detected in the period from time t8 onwards. In this case, in the door open period determination process, the door open period determination unit 32 determines one or both of the period from time t1 to time t4 and the period from time t5 to time t8 as the door open period.

[0050] The door state calculation unit 33 executes calculation processing during the determined door-open period to calculate the state of the car door 2. In this way, according to the door monitoring system 100 of the second embodiment, it is possible to monitor the state of the car door 2 during the door-open period determined based on the fully-open signal and the fully-closed signal of the position sensor 22.

[0051] 2-2. Specific Processing Executed in the Elevator Door Monitoring System of Embodiment 2 Next, specific processing executed in the elevator door monitoring system 100 of Embodiment 2 will be described. Figures 10 and 11 are flowcharts showing routines executed in the door monitoring system of Embodiment 2. The routines shown in Figures 10 and 11 are executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0052] The processes of steps S200 and S202 in the routine shown in Fig. 10 correspond to the door-open period determination process. Here, the same processes as the processes of steps S100 and S102 are executed. If the determination is established in step S202, the process proceeds to step S204.

[0053] The processes in steps S204 and S206 correspond to calculation processes. Here, the same processes as those in steps S104 and S106 are executed. When the process in step S206 is completed, the process proceeds to step S208.

[0054] The processing of step S208 corresponds to door-open period determination processing. Specifically, in step S208, it is determined whether the car door 2 has been fully opened. Here, it is determined whether the position sensor 22 has detected a fully open signal. As a result, if the determination is found to be true, it is determined that the door-open period has ended, and the processing of this routine proceeds to step S210 of the routine shown in FIG. 11. On the other hand, if the determination is found to be false, the processing of step S204 is executed again. As a result, the processing of steps S204 to S208 is repeatedly executed until the determination of step S208 is found to be true.

[0055] The processing of step S210 corresponds to door-open period determination processing. Specifically, in step S210, it is determined whether or not the car door 2 has started to close. Here, it is determined whether or not the position sensor 22 has stopped detecting a full-open signal. Alternatively, it is determined whether or not the door opening / closing acceleration detected by the first acceleration sensor 20 has exceeded a determination value representing door closing. The determination value here is, for example, 0 or a negative value close to 0. As a result, if it is determined that the determination is successful, the processing proceeds to step S212. If it is determined that the determination is not successful, the processing of step S210 is repeatedly executed until it is determined that the determination is successful.

[0056] The processes in steps S212 and S214 correspond to calculation processes. Here, the same processes as those in steps S204 and S206 are executed. When the process in step S214 is completed, the process proceeds to the next step S216.

[0057] The processing of step S216 corresponds to door-open period determination processing. Specifically, in step S216, it is determined whether or not the car door 2 has been fully closed. Here, the same processing as in step S108 is executed. As a result, if the determination is found to be true, the processing of this routine is terminated, and if the determination is found to be false, the processing of step S212 is executed again. As a result, the processing from step S212 to step S216 is repeatedly executed until the determination of step S216 is found to be true.

[0058] As is clear from the above explanation, according to the elevator door monitoring system 100 of embodiment 2, the state of the car door 2 can be monitored without using an elevator control signal during the door opening period from when the car door 2 starts to open from a fully closed state until it is fully opened, and during the door opening period from when the car door 2 starts to close from a fully opened state until it is fully closed.

[0059] Embodiment 3. 3-1. Features of the elevator door monitoring system in embodiment 3

[0060] The door monitoring system 100 in the third embodiment is the same as the door monitoring system 100 in the second embodiment, except that the polarity of the second magnet 25 is the same as that of the first magnet 24 .

[0061] The position sensor 22 is a Hall sensor that detects approach to a magnet and outputs a position signal. A first magnet 24 and a second magnet 25 are disposed on the door frame 5. The second magnet 25 is a magnet having the same polarity as the first magnet 24. With this configuration, the position sensor 22 outputs a fully closed signal in response to the approach of the first magnet 24 when the car door 2 is fully closed. Furthermore, the position sensor 22 outputs a fully open signal in response to the approach of the second magnet 25 when the car door 2 is fully open.

[0062] Here, if the second magnet 25 is a magnet having the same polarity as the first magnet 24, it is impossible to distinguish between a fully closed signal and a fully open signal. Therefore, the door open period determination unit 32 of the door monitoring system 100 of the second embodiment determines whether the timing is the start of door opening from a fully closed state or the start of door closing from a fully open state, based on the positive or negative sign of the door opening / closing acceleration at the timing when the fully closed signal or the fully open signal as a position signal switches from detection to non-detection, that is, based on the direction of the door opening / closing speed at that timing.

[0063] Fig. 12 is a time chart showing an example of changes in the open / closed state of the car door monitored by the door monitoring system of embodiment 3. In Fig. 12, (A) represents changes in the position signal of the position sensor 22, (B) represents changes in the door opening / closing acceleration calculated from the detection value of the first acceleration sensor 20, (C) represents changes in the door opening / closing speed obtained by integrating the door opening / closing acceleration, and (D) represents changes in the door opening / closing position obtained by further integrating the door opening / closing speed.

[0064] In the example shown in this figure, the position signal of the position sensor 22 is detected during the period from time t0 to time t1, and door opening / closing acceleration in the door opening direction (positive value) occurs at time t1 when the position signal switches from detection to non-detection. Therefore, in the door-opening period determination process, the door-opening period determination unit 32 determines time t1 as the start of door opening from a fully closed state of the car door 2, and determines the period from time t0 to time t1 as a fully closed period.

[0065] In the example shown in the figure, the position signal of the position sensor 22 is detected during the period from time t4 to time t5, and door opening / closing acceleration in the door closing direction (negative value) occurs at time t5 when the position signal switches from detection to non-detection. Therefore, in the door-opening period determination process, the door-opening period determination unit 32 determines time t5 as the start of door closing from full open, determines the period from time t4 to time t5 as the full-opening period, and determines time t4 as the completion of full opening. Then, in the door-opening period determination process, the door-opening period determination unit 32 determines the period from time t1 when the door opening starts to time t4 when the door opening is completed as the door-opening period.

[0066] The door state calculation unit 33 executes calculation processing during the determined door-open period to calculate the state of the car door 2. As described above, according to the door monitoring system 100 of the third embodiment, it is possible to determine the door-open period based on the position signal from the position sensor 22 and the positive or negative sign of the door opening / closing acceleration detected by the first acceleration sensor 20. This makes it possible to monitor the state of the car door 2 during the door-open period.

[0067] 3-2. Specific Processing Executed in the Elevator Door Monitoring System of Embodiment 3 Next, specific processing executed in the elevator door monitoring system 100 of Embodiment 3 will be described. Fig. 13 is a flowchart showing a routine executed in the door monitoring system of Embodiment 3. The routine shown in Fig. 13 is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0068] The processing of steps S300, S302, and S304 in the routine shown in Fig. 13 corresponds to the door-open period determination processing. Specifically, in step S300, it is determined whether the car door 2 has been detected as being fully closed or fully open. Here, it is determined whether the position sensor 22 has detected a position signal. As a result, if the determination is found to be true, the processing proceeds to step S302, and if the determination is found to be false, the processing of this routine is terminated.

[0069] In step S302, it is determined whether the car door 2 has started to open. Here, it is determined whether the door opening / closing acceleration detected by the first acceleration sensor 20 has exceeded a determination value representing door opening. The determination value used here is 0 or a positive value close to 0. As a result, if the determination is found to be successful, it is determined that the car door 2 has started to open from a fully closed position, and the process proceeds to step S308. On the other hand, if the determination in step S302 is found to be unsuccessful, the process proceeds to step S304.

[0070] In step S304, it is determined whether the car door 2 has started to close. Here, it is determined whether the door opening / closing acceleration detected by the first acceleration sensor 20 has fallen below a determination value representing door closing. The determination value used here is 0 or a negative value close to 0. As a result, if it is determined that the determination is successful, it is determined that the car door 2 has started to close from a fully open position, and the process proceeds to step S308. On the other hand, if it is not determined that the determination in step S304 is successful, the process returns to step S302.

[0071] The processes in steps S308 and S310 correspond to calculation processes. Here, the same processes as those in steps S104 and S106 are executed. When the process in step S310 is completed, the process proceeds to the next step S312.

[0072] The processing of step S312 corresponds to door-open period determination processing. Specifically, in step S312, it is determined whether the car door 2 has been fully opened or fully closed. Here, it is determined whether the position sensor 22 has detected a position signal. As a result, if the determination is found to be true, the processing of this routine is terminated, and if the determination is found to be false, the processing of step S308 is executed again. As a result, the processing of steps S308 to S312 is repeatedly executed until the determination of step S312 is found to be true.

[0073] As is clear from the above explanation, according to the elevator door monitoring system 100 of embodiment 3, the door opening period can be determined based on the position signal of the position sensor 22 and the door opening / closing acceleration detected by the first acceleration sensor 20.

[0074] Embodiment 4. 4-1. Features of the elevator door monitoring system in embodiment 4 Fig. 14 is a front view for explaining the features of the elevator door monitoring system in embodiment 4. In the door device shown in Fig. 14, parts that are the same as or equivalent to those in door device 1 of embodiment 1 are given the same reference numerals and descriptions thereof will be omitted.

[0075] The door monitoring system 100 in the fourth embodiment includes a first acceleration sensor 20, a position sensor 22, a first magnet 24, and a monitoring device 30, as well as a second acceleration sensor 21. The second acceleration sensor 21 detects the vertical acceleration of the elevator car 4. The acceleration detected by the second acceleration sensor 21 will be referred to hereinafter as "vertical acceleration." The second acceleration sensor 21 is installed on a suspension member 6, which is a door structure that opens and closes integrally with the car door 2. The location of the second acceleration sensor 21 is not limited as long as it is installed on the car door 2 or on the door structure that opens and closes integrally with the car door. The second acceleration sensor 21 is electrically connected to the monitoring device 30 by a cable 27.

[0076] There is no limitation on the type and structure of the second acceleration sensor 21. For example, the second acceleration sensor 21 may be configured as a two-axis sensor or a three-axis sensor integrated with the first acceleration sensor 20.

[0077] When the monitoring device 30 detects vertical movement of the car 4 during the door-open period, it determines that an abnormality has occurred in running with the door open and issues an alert. This process will be referred to as "alert processing" hereinafter. In this manner, the door monitoring system 100 of the fourth embodiment can detect an abnormality in running with the door open using the second acceleration sensor 21.

[0078] 4-2. Specific Processing Executed in the Elevator Door Monitoring System of Embodiment 4 Next, specific processing executed in the elevator door monitoring system 100 of embodiment 4 will be described. Fig. 15 is a flowchart showing a routine executed in the door monitoring system of embodiment 4. The routine shown in Fig. 15 is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0079] The processes of steps S400 and S402 in the routine shown in Fig. 15 correspond to the door-open period determination process. Here, the same processes as the processes of steps S100 and S102 are executed. If the determination is not established in step S400, the process proceeds to step S404.

[0080] In step S404, it is determined whether or not the second acceleration sensor 21 has detected vertical movement of the car 4. If the determination is found to be positive, it is determined that the car 4 has moved with the car doors 2 not fully closed, and the process proceeds to step S406. On the other hand, if the determination is found to be negative in step S404, the process of this routine is terminated.

[0081] In step S406, an alarm is generated, thereby informing the manager of the movement of the car 4 with the door open. When the process of step S406 is completed, the process of this routine ends.

[0082] If the determination is found to be successful in step S402, it can be determined that the car door 2 is currently open. In this case, the process proceeds to step S408, where it is determined whether or not vertical movement of the car 4 has been detected by the second acceleration sensor 21. If the determination is found to be successful as a result, it is determined that the car 4 has moved during the door-open period, and the process proceeds to step S410. In step S410, an alarm is generated. This notifies the manager of the movement of the car 4 with the door open.

[0083] On the other hand, if the determination is not made in step S408, the process proceeds to step S412. The processes of steps S412 and S414 correspond to calculation processes. Here, the same processes as the processes of steps S104 and S106 are executed. When the process of step S414 is completed, the process proceeds to the next step S416.

[0084] The processing of step S416 corresponds to door-open period determination processing. Specifically, in step S416, it is determined whether or not the car door 2 has been fully closed. Here, the same processing as step S108 is executed. As a result, if it is determined that the determination is true, the processing of this routine is terminated, and if it is determined that the determination is not true, the processing of step S408 is executed again.

[0085] As is clear from the above explanation, according to the elevator door monitoring system 100 of embodiment 4, it is possible to monitor for door-open running abnormalities during the door-open period from when the car doors 2 are fully closed to when they are not, without using elevator control signals.

[0086] REFERENCE SIGNS LIST 1 Door device, 2 Cage door, 3 Door opening / closing mechanism, 4 Cage, 5 Door frame, 6 Suspension member, 7 Hanger roller, 8 Rail, 9 Pulley, 10 Belt, 11 Connecting member, 12 Door motor, 20 First acceleration sensor, 21 Second acceleration sensor, 22 Position sensor, 24 First magnet, 25 Second magnet, 26, 27, 28 Cable, 30 Monitoring device, 31 Input processing unit, 32 Door open period determination unit, 33 Door state calculation unit, 40 Processor, 50 Storage device, 52 Monitoring program, 54 Data, 60 Dedicated hardware, 62 Processing circuit, 100 Door monitoring system

Claims

1. A first acceleration sensor is installed on the car door that opens and closes the car entrance in the elevator car, or on a door structure that moves integrally with the car door, and detects the acceleration in the opening and closing direction of the car door. A position sensor that detects when the cage door is fully closed, A monitoring device that receives a detected value from the first acceleration sensor and a position signal from the position sensor, determines the door open period after the door is fully closed based on the position signal detected by the position sensor, without using a control signal to open or close the car door, and monitors the state of the car door during the door open period based on the detected value from the first acceleration sensor, An elevator door monitoring system equipped with [feature / feature].

2. The position sensor and the monitoring device are installed on the cage door or the door structure. The first acceleration sensor and the position sensor are each connected to the monitoring device by wire. The elevator door monitoring system according to claim 1.

3. The door structure includes a suspension member that is fixed to the upper part of the car door and slidably suspended on a rail fixed to the car compartment. The first acceleration sensor, the position sensor, and the monitoring device are installed on the suspension member. The elevator door monitoring system according to claim 2.

4. The monitoring device determines the period from when the cage door is detected to fully closed until the door is detected to be fully closed as the door open period. An elevator door monitoring system according to any one of claims 1 to 3, configured as described above.

5. The position sensor is a Hall sensor that detects approach to a magnet. The elevator further comprises a first magnet installed on a fixed object in the elevator car, The first magnet is positioned so as to be separated from and facing the Hall sensor when the cage door is fully closed, and so as to be detected by the Hall sensor. The elevator door monitoring system according to claim 4.

6. The position sensor is configured to further detect when the cage door is fully open. The monitoring device determines the door opening period as the period from when the opening of the cage door, which has been detected as fully closed, begins until the full opening is detected, or from when the closing of the cage door, which has been detected as fully open, begins until the full closing is detected. An elevator door monitoring system according to any one of claims 1 to 3, configured as described above.

7. The position sensor is a Hall sensor that detects approach to a magnet. The first magnet is installed on a fixed object in the aforementioned car compartment, The system further comprises a second magnet installed on a fixed object in the aforementioned elevator car, The first magnet is positioned so as to be separated from and facing the Hall sensor when the cage door is fully closed, and so as to be detected by the Hall sensor. The second magnet is positioned so as to be separated from and facing the Hall sensor when the cage door is fully open, and so as to be detected by the Hall sensor. The elevator door monitoring system according to claim 6.

8. The polarity of the first magnet is different from the polarity of the second magnet. The elevator door monitoring system according to claim 7.

9. The polarity of the first magnet is the same as the polarity of the second magnet. The aforementioned monitoring device is When the position sensor detects that the cage door is fully open or fully closed, the system determines whether the cage door will start opening if it is detected as fully closed, or whether the cage door will start closing if it is detected as fully open, based on whether the detected value of the first acceleration sensor changes to a positive or negative value. The elevator door monitoring system according to claim 7, configured as follows.

10. The vehicle further includes a second acceleration sensor for detecting the vertical acceleration of the elevator car, The monitoring device monitors the movement of the elevator car during the door-open period based on the detected value from the second acceleration sensor. An elevator door monitoring system according to any one of claims 1 to 3, configured as described above.

11. During the period when the position sensor detects that the cage door is fully closed, the monitoring device operates in a power-saving mode that consumes less power than the normal mode. An elevator door monitoring system according to any one of claims 1 to 3, configured as described above.