Elevator diagnosis system and diagnosis method

Abstract

The present invention provides a diagnosis system and a diagnosis method that can diagnose an abnormality in a door torque of an elevator in consideration of influence of an operation environment. A diagnosis system (19) comprises a measurement unit (21), an acquisition unit (23), a correction unit (22), and a determination unit (25). The measurement unit (21) measures the door torque when a door of an elevator (1) opens or closes. The acquisition unit (23) acquires an offset value which corrects the measured value of the door torque by the measurement unit (21) on the basis of environmental information at the time when the measurement unit (21) measured the door torque. The environmental information includes information relating to at least one of the temperature and the humidity. The correction unit (22) uses the offset value acquired by the acquisition unit (23) to correct the measured value of the door torque by the measurement unit (21). The determination unit (25) determines an abnormality in the door torque when a difference between the value of the door torque corrected by the correction unit (22) and a reference value set in advance is greater than a threshold value set in advance.

Description

Elevator diagnostic system and diagnostic method

[0001] The present disclosure relates to a diagnostic system and method for an elevator.

[0002] Patent Document 1 discloses an example of an elevator diagnostic system. In the diagnostic system, door torque is measured when an elevator door is opened or closed. The diagnostic system determines an abnormality based on the measured door torque.

[0003] Japanese Patent Application Publication No. 2008-120471

[0004] The diagnostic system of Patent Document 1 diagnoses abnormalities regardless of the operating environment, such as temperature and humidity. However, elevator door torque may be affected by the operating environment, such as temperature and humidity. Therefore, the accuracy of the diagnosis may be reduced depending on the operating environment.

[0005] The present disclosure relates to solving such problems, and provides a diagnostic system and a diagnostic method that can diagnose abnormalities in elevator door torque while taking into account the influence of the operating environment.

[0006] The elevator diagnostic system according to the present disclosure includes a measurement unit that measures door torque when an elevator door is opened or closed, an acquisition unit that acquires an offset value that corrects the door torque measurement value by the measurement unit based on environmental information including at least one of temperature and humidity information at the time the measurement unit measures the door torque, a correction unit that corrects the door torque measurement value by the measurement unit using the offset value, and a determination unit that determines an abnormality in the door torque when the difference between the door torque value corrected by the correction unit and a preset reference value is greater than a preset threshold value.

[0007] The elevator diagnostic method according to the present disclosure includes a measurement step of measuring door torque when the elevator door is opened or closed, an acquisition step of acquiring an offset value for correcting the measurement value of the door torque in the measurement step based on environmental information including at least one of temperature and humidity information at the time when the door torque is measured in the measurement step, a correction step of correcting the measurement value of the door torque in the measurement step with the offset value, and a determination step of determining an abnormality in the door torque when the difference between the door torque value corrected in the correction step and a predetermined reference value is greater than a predetermined threshold value.

[0008] According to the diagnostic system or diagnostic method of the present disclosure, abnormalities in elevator door torque can be diagnosed taking into account the influence of the operating environment.

[0009] FIG. 1 is a configuration diagram of an elevator according to embodiment 1. FIG. 2 is a block diagram showing the configuration of a diagnostic system according to embodiment 1. FIG. 3 is a diagram showing an example of offset values ​​in the diagnostic system according to embodiment 1. FIG. 4 is a diagram showing an example of offset values ​​in the diagnostic system according to embodiment 1. FIG. 5 is a flowchart showing an example of the operation of the diagnostic system according to embodiment 1. FIG. 6 is a hardware configuration diagram of a main part of the diagnostic system according to embodiment 1.

[0010] The following describes embodiments of the subject matter of the present disclosure with reference to the accompanying drawings. In each drawing, identical or corresponding parts are designated by the same reference numerals, and redundant explanations are appropriately simplified or omitted. Note that the subject matter of the present disclosure is not limited to the following embodiments, and any component of the embodiments may be modified or omitted within the scope of the gist of the present disclosure.

[0011] First Embodiment Fig. 1 is a configuration diagram of an elevator 1 according to a first embodiment.

[0012] The elevator 1 is applied to, for example, a building having multiple floors. A hoistway 2 for the elevator 1 is provided in the building. The hoistway 2 is a long space extending vertically across multiple floors. A landing 3 for the elevator 1 is provided on each floor of the building. The landing 3 is a location leading to the hoistway 2. A landing door 4 is provided at the landing 3 on each floor. The landing door 4 includes a landing door panel 5 and a landing threshold 6. The landing door panel 5 separates the hoistway 2 from the landing 3. The landing door panel 5 opens and closes along the landing threshold 6. The elevator 1 includes a hoisting machine 7, a main rope 8, a car 9, a counterweight 10, and a control panel 11.

[0013] The hoisting machine 7 is disposed, for example, at the upper or lower part of the hoistway 2. For example, if a machine room of the elevator 1 is provided above the hoistway 2, the hoisting machine 7 may be disposed in the machine room. The hoisting machine 7 includes a motor that generates driving force and a sheave that rotates by the driving force generated by the motor.

[0014] The main ropes 8 are wound around the sheaves of the hoisting machine 7. The main ropes 8 support the load of the car 9 on one side of the sheaves of the hoisting machine 7. The main ropes 8 support the load of the counterweight 10 on the other side of the sheaves of the hoisting machine 7. The main ropes 8 move by the driving force generated by the motor of the hoisting machine 7 so as to be wound up onto the sheaves of the hoisting machine 7 or to be unwound from the sheaves of the hoisting machine 7.

[0015] The car 9 is a device that travels up and down the hoistway 2 to transport users of the elevator 1 and other passengers between multiple floors. The car 9 is equipped with a car door 12. The car door 12 includes a door drive device 13, a car door panel 14, and a car threshold 15. The door drive device 13 includes a door motor that generates a driving force. The car door panel 14 separates the interior and exterior of the car 9. The car door panel 14 opens and closes along the car threshold 15 by the driving force generated by the door motor of the door drive device 13. When the car 9 stops at a floor, the car door panel 14 opens and closes in conjunction with the landing door panel 5 of that floor. The counterweight 10 is a device that balances the loads acting on both sides of the sheave of the hoisting machine 7 between the car 9 and the counterweight 10. The car 9 and the counterweight 10 travel up and down the hoistway 2 in opposite directions to each other in conjunction with the movement of the main rope 8.

[0016] The control panel 11 is a device that controls the operation of the elevator 1. The control panel 11 is located, for example, at the top or bottom of the hoistway 2. For example, if a machine room for the elevator 1 is provided above the hoistway 2, the control panel 11 may be located in the machine room. The operation of the elevator 1 controlled by the control panel 11 includes, for example, the running of the car 9. The control panel 11 is connected to the hoisting machine 7 and the car 9 so as to be able to output control signals for the elevator 1 and to be able to acquire information on the status of the elevator 1.

[0017] A remote monitoring device 16 is applied to the elevator 1. The remote monitoring device 16 is a device used to remotely monitor the status of the elevator 1. The remote monitoring device 16 is connected to the control panel 11 so as to be able to collect information on the status of the elevator 1 and to be able to output external control signals to the elevator 1. The information collected by the remote monitoring device 16 is transmitted to a central management device 18 via a communication network 17, such as the Internet or a telephone line. The central management device 18 is a device that collects and manages information on the status of the elevator 1. The central management device 18 is provided at a base such as an information center. The central management device 18 is composed of, for example, one or more server devices. Some or all of the functions of the central management device 18 may be implemented by processing and storage resources on a cloud service.

[0018] A diagnostic system 19 is applied to the elevator 1. The diagnostic system 19 is a system that diagnoses conditions such as abnormalities of the elevator 1. The diagnostic system 19 determines an abnormality in the door torque generated by the door motor of the door drive device 13 as the condition of the elevator 1. The diagnostic system 19 may be an internal system of the elevator 1, or an external system applied to the elevator 1 from the outside. The diagnostic system 19 determines an abnormality in the door torque during a diagnostic operation of the elevator 1 that is performed at a predetermined timing, for example. The predetermined timing may be a regular timing, such as once a month. The diagnostic system 19 includes an environmental sensor 20 and a measurement unit 21.

[0019] The environmental sensor 20 is a part equipped with a function for measuring environmental information that represents the operating environment of the door driver 13. The environmental sensor 20 is provided, for example, in the hoistway 2. In this example, the environmental sensor 20 is disposed near the control panel 11. The environmental sensor 20 may also be disposed near the door driver 13 in the car 9. The environmental information includes information on at least one of the temperature and humidity of the hoistway 2. In this example, the environmental information includes both the temperature and humidity of the hoistway 2. The environmental sensor 20 is, for example, a temperature and humidity sensor that measures temperature and humidity.

[0020] The measurement unit 21 is a part equipped with a function for measuring the door torque when the doors of the elevator 1 are opened and closed. The measurement unit 21 measures, for example, the door torque generated by the door motor of the door drive device 13 to open and close the car door panel 14. In this example, the measurement unit 21 is provided in the door drive device 13.

[0021] The diagnostic system 19 diagnoses abnormalities in the door torque using environmental information measured by the environmental sensor 20 and the door torque measured by the measurement unit 21 .

[0022] FIG. 2 is a block diagram showing the configuration of the diagnostic system 19 according to the first embodiment.

[0023] The diagnostic system 19 includes a correction unit 22, an acquisition unit 23, a calculation unit 24, a determination unit 25, and a reporting unit 26. In this example, the functions of the correction unit 22, the acquisition unit 23, the determination unit 25, and the reporting unit 26 are installed in the control panel 11. In addition, the function of the calculation unit 24 is installed in the central management device 18.

[0024] The correction unit 22 is a part that has a function of correcting the door torque measurement value by the measurement unit 21 in accordance with environmental information. The measurement unit 21 measures the door torque, for example, during a diagnostic operation. The correction unit 22 corrects the door torque measured at this time. The correction unit 22 corrects the door torque measurement value by adding an offset value in accordance with the environmental information to the door torque measured by the measurement unit 21.

[0025] The acquisition unit 23 is a part that has a function of acquiring an offset value that the correction unit 22 uses to correct the measurement value of the door torque. The acquisition unit 23 acquires environmental information when the measurement unit 21 measures the door torque. The acquisition unit 23 acquires the environmental information when the measurement unit 21 measures the door torque, for example, from the environmental sensor 20. The acquisition unit 23 acquires the environmental information during diagnostic operation, for example.

[0026] The calculation unit 24 is a part that has a function of calculating an offset value based on environmental information. The calculation unit 24 receives the environmental information from the acquisition unit 23. The calculation unit 24 outputs the offset value calculated based on the received environmental information to the acquisition unit 23. The offset value output by the calculation unit 24 is provided to the correction unit 22 via the acquisition unit 23.

[0027] The determination unit 25 determines that the door torque is abnormal when the difference between the door torque value corrected by the correction unit 22 and the reference value is greater than a preset threshold. The determination unit 25 uses, as the reference value, a measurement value measured by the measurement unit 21 when the elevator 1 is first started after normal operation of the elevator 1 has been confirmed, for example, after installation or maintenance inspection of the elevator 1. Environmental information at the time the door torque serving as the reference value was measured may be stored in the diagnostic system 19 together with the reference value. The temperature and humidity represented by the environmental information at this time are used, for example, as the reference temperature and reference humidity. The determination unit 25 may also use, as the reference value, the door torque value corrected by the correction unit 22 based on the environmental information at this time.

[0028] The alarm issuing unit 26 is a part that has a function of reporting the determination result when the determination unit 25 determines that the door torque is abnormal. In this example, the alarm issuing unit 26 reports the determination result to the central management device 18. In the central management device 18, the report issued by the alarm issuing unit 26 is processed by a management unit 27 that manages information on the status of the elevator 1. Based on the report issued by the alarm issuing unit 26, a response such as dispatching a maintenance worker to the elevator 1 where the abnormality has occurred is carried out.

[0029] Next, examples of offset values ​​in the diagnostic system 19 will be described with reference to Fig. 3 and Fig. 4. Fig. 3 and Fig. 4 are diagrams showing examples of offset values ​​in the diagnostic system 19 according to the first embodiment.

[0030] In this example, the offset value depends on the difference between the environmental information when the reference door torque is measured and the environmental information when the door torque to be diagnosed is measured. More specifically, the offset value depends on the difference between the reference temperature and the temperature when the door torque to be diagnosed is measured. The offset value also depends on the difference between the reference humidity and the humidity when the door torque to be diagnosed is measured.

[0031] FIG. 3 shows an example of the relationship between the offset value and the temperature difference from the reference temperature. In the graph of FIG. 3, the horizontal axis represents the temperature difference, and the vertical axis represents the offset value. The relationship between the offset value and the temperature difference may be either linear or nonlinear. Furthermore, the offset value may take either a continuous value or a discrete value relative to the temperature difference.

[0032] FIG. 4 shows an example of the relationship between the offset value and the humidity difference from the reference humidity. In the graph of FIG. 3, the horizontal axis represents the humidity difference. The vertical axis represents the offset value. The relationship between the offset value and the humidity difference may be either linear or nonlinear. Furthermore, the offset value may take a continuous value or a discrete value relative to the humidity difference. The relationship between the offset value and the environmental information may include an interaction that represents a synergistic effect between the temperature difference and the humidity difference.

[0033] The calculation unit 24 calculates the offset value using the environmental information received from the acquisition unit 23, for example, based on the relationship shown in Figures 3 and 4. The relationship between the offset value and the environmental information is stored, for example, in the central management device 18 in which the calculation unit 24 is installed. The relationship between the offset value and the environmental information is set, for example, based on a prior test or simulation. The relationship between the offset value and the environmental information may be set, for example, as follows, based on a measurement value in the elevator 1. Note that in this example, the relationship between the offset value and the environmental information is calculated in the calculation unit 24.

[0034] The calculation unit 24 acquires, via the acquisition unit 23, the measurement value measured by the measurement unit 21 when the elevator 1 is first started after the elevator 1 is confirmed to be operating normally, such as after installation or maintenance inspection, as the reference value. At this time, the calculation unit 24 also acquires environmental information when the door torque serving as the reference value was measured. As a result, the calculation unit 24 acquires a combination of the reference value and the environmental information. The calculation unit 24 constructs a model representing the relationship between the reference value and the environmental information based on multiple combinations of the reference value and the environmental information, for example, by simple regression or multiple regression. The calculation unit 24 may also construct a model representing the relationship between the reference value and the environmental information based on multiple combinations of the reference value and the environmental information, for example, by a technique such as machine learning. The calculation unit 24 may also construct a model representing the relationship between the reference value and the environmental information by also using measurement values ​​of other elevators of the elevator 1. At this time, the calculation unit 24 may also use only measurement values ​​of other elevators of the same model as the elevator 1. The calculation unit 24 sets a reference temperature and humidity as a reference operating environment, and sets the relationship between the offset value and the environmental information based on the difference between the reference value of the door torque in the reference operating environment and the reference value of the door torque in another operating environment.

[0035] Next, an example of the operation of the diagnostic system 19 will be described with reference to Fig. 5. Fig. 5 is a flowchart showing an example of the operation of the diagnostic system 19 according to the first embodiment. The processing in Fig. 5 is performed, for example, during a diagnostic operation at a preset timing.

[0036] In step S101, the control panel 11 opens or closes the car door panel 14 using the door torque generated by the door drive device 13. At this time, the control panel 11 acquires a measurement value of the door torque from the measurement unit 21. In this example, the measurement unit 21 measures the value of the door torque generated by the door motor of the door drive device 13 for each fixed opening degree between fully closed and fully open of the car door panel 14. That is, the measurement unit 21 acquires the door torque at each opening degree of the car door panel 14 as a measurement value. Thereafter, the processing of the diagnostic system 19 proceeds to step S102.

[0037] In step S102, the control panel 11 acquires environmental information from the environmental sensor 20. In this example, the control panel 11 acquires, as the environmental information, information on the temperature and humidity of the hoistway 2. Thereafter, the processing of the diagnostic system 19 proceeds to step S103.

[0038] In step S103, the acquisition unit 23 of the control panel 11 provides the environmental information acquired in step S102 to the calculation unit 24 of the central management unit 18. Thereafter, the process of the diagnostic system 19 proceeds to step S104.

[0039] The calculation unit 24 calculates an offset value based on the temperature and humidity indicated by the environmental information received from the acquisition unit 23. For example, the calculation unit 24 calculates the difference between the temperature and humidity indicated by the environmental information and the temperature and humidity in the reference operating environment as a temperature difference and a humidity difference. Using the calculated temperature difference and humidity difference, the calculation unit 24 calculates an offset value based on, for example, the relationships shown in FIGS. 3 and 4 . Here, when the measured value of the door torque is a value for each opening degree of the car door panel 14, the offset value may be set individually for each opening degree, or may be set as a single value averaged over all opening degrees. The calculation unit 24 of the central management device 18 outputs the calculated offset value to the acquisition unit 23 of the control panel 11.

[0040] In step S104, the acquisition unit 23 of the control panel 11 acquires the offset value from the calculation unit 24 of the central management unit 18. After that, the process of the diagnostic system 19 proceeds to step S105.

[0041] In step S105, the correction unit 22 corrects the measurement value of the door torque acquired in step S101 with the offset value acquired in step S104. In this example, the correction unit 22 performs the correction by adding the offset value to the measurement value of the door torque. Here, when the measurement value of the door torque is a value for each opening degree of the car door panel 14, the correction unit 22 corrects the door torque for each opening degree. Thereafter, the processing of the diagnostic system 19 proceeds to step S106.

[0042] In step S106, the determination unit 25 performs processing to determine whether or not there is an abnormality in the door torque. The determination unit 25 calculates the difference between the door torque value corrected in step S105 and a preset reference value. The reference value is, for example, a preset reference value in a standard operating environment. The determination unit 25 determines that there is an abnormality in the door torque when the calculated difference exceeds a preset threshold. Here, when the measured door torque values ​​are values ​​for each opening degree of the car door panel 14, the determination unit 25 calculates the difference from the reference value for each opening degree. The determination unit 25 may determine that there is an abnormality in the door torque when the difference exceeds a threshold for any opening degree, or when the sum of the differences for each opening degree or the sum of the absolute values ​​of the differences exceeds a threshold. When the determination unit 25 determines that there is an abnormality in the door torque because the difference in the door torque exceeds the preset threshold, the processing of the diagnostic system 19 proceeds to step S107. On the other hand, when the difference in door torque does not exceed the preset threshold value and the determination unit 25 does not determine that the door torque is abnormal, the processing of the diagnostic system 19 ends.

[0043] In step S107, the alarm issuing unit 26 of the control panel 11 notifies the management unit 27 of the central management device 18 of the determination result in step S106. Based on the notified content, the management unit 27 performs processing required to respond, such as dispatching a maintenance worker to the elevator 1 where the abnormality has occurred. Thereafter, the processing of the diagnostic system 19 ends.

[0044] As described above, the diagnostic system 19 according to the first embodiment includes the measurement unit 21, the acquisition unit 23, the correction unit 22, and the determination unit 25. The measurement unit 21 measures the door torque when the doors of the elevator 1 are opened or closed. The acquisition unit 23 acquires an offset value for correcting the door torque measurement value by the measurement unit 21 based on environmental information when the measurement unit 21 measures the door torque. The environmental information includes at least one of temperature and humidity information. The correction unit 22 corrects the door torque measurement value by the measurement unit 21 using the offset value acquired by the acquisition unit 23. The determination unit 25 determines an abnormality in the door torque when the difference between the door torque value corrected by the correction unit 22 and a preset reference value is greater than a preset threshold. The diagnostic method according to the first embodiment also includes a measurement step, an acquisition step, a correction step, and a determination step. The measurement step is a step of measuring the door torque when the doors of the elevator 1 are opened or closed. The acquisition step is a step of acquiring an offset value for correcting the door torque measurement value in the measurement step based on environmental information when the door torque is measured in the measurement step. The correction step is a step of correcting the door torque measurement value in the measurement step by the offset value acquired in the acquisition step. The determination step is a step of determining an abnormality in the door torque when a difference between the door torque value corrected in the correction step and a preset reference value is greater than a preset threshold value.

[0045] With this configuration, the measured door torque value is corrected using the offset value acquired based on the environmental information. An abnormality in the door torque of the elevator 1 is diagnosed based on the door torque corrected using the offset value. This allows the door torque abnormality of the elevator 1 to be diagnosed while taking into account the effects of the operating environment. Temperature changes can cause changes in physical properties such as dimensions and elasticity in the door shoes at the bottom of the landing door panel 5, which is guided by the landing threshold 6, or the door shoes at the bottom of the car door panel 14, which is guided by the car threshold 15. Furthermore, humidity changes can cause changes in the coefficient of friction and other properties of these thresholds and door shoes. Therefore, the door torque of the elevator 1 can be affected by the operating environment, such as temperature and humidity. Because the diagnostic system 19 takes into account the effects of the operating environment, such as temperature and humidity, the accuracy of the diagnosis is further improved.

[0046] The diagnostic system 19 also includes an environmental sensor 20. The environmental sensor 20 is disposed in the elevator shaft 2 of the elevator 1. The environmental sensor 20 measures environmental information. The acquisition unit 23 acquires the environmental information from the environmental sensor 20.

[0047] With this configuration, the measurement value of the door torque is corrected based on environmental information actually measured in the hoistway 2. This allows the influence of the operating environment to be taken into account with higher accuracy, thereby further improving the accuracy of diagnosis in the diagnostic system 19.

[0048] The diagnostic system 19 also includes a calculation unit 24. The calculation unit 24 calculates an offset value based on the environmental information received from the acquisition unit 23. The acquisition unit 23 acquires the offset value from the calculation unit 24.

[0049] The acquisition unit 23 may acquire the environmental information from an external weather information service. The external weather information service may be provided, for example, by a public institution or a weather service provider that handles weather information. The acquisition unit 23 acquires weather information for the location of the building to which the elevator 1 is applied, for example, via the communication network 17. The acquisition unit 23 acquires, for example, temperature and humidity information as the weather information. The acquisition unit 23 may acquire weather information such as sunny or rainy as the weather information. In this case, the acquisition unit 23 pre-stores environmental information corresponding to each piece of weather information such as sunny or rainy. The acquisition unit 23 acquires an offset value using the corresponding environmental information based on the acquired weather information.

[0050] This configuration makes it possible to apply the diagnostic system 19 even when the elevator is not equipped with an environmental sensor.

[0051] Furthermore, the calculation unit 24 may be mounted on a computing device external to the diagnostic system 19. The computing device may be configured, for example, by one or more server devices connected to the communication network 17. The central management device 18 may be an external device included in a system separate from the diagnostic system 19. In this case, the central management device 18 equipped with functions such as the calculation unit 24 is an example of a computing device external to the diagnostic system 19. Furthermore, some or all of the functions of the diagnostic system 19, such as the correction unit 22, the acquisition unit 23, the determination unit 25, and the alarm transmission unit 26, may be mounted on any of the control panel 11, the remote monitoring device 16, the central management device 18, and other devices of the elevator 1.

[0052] Furthermore, the diagnostic system 19 may perform the diagnosis during normal operation of the elevator 1. For example, the diagnostic system 19 may diagnose whether or not there is an abnormality in the door torque every time the car door panel 14 is opened or closed during normal operation.

[0053] Next, an example of the hardware configuration of the diagnostic system 19 will be described with reference to Fig. 6. Fig. 6 is a hardware configuration diagram of the main part of the diagnostic system 19 according to the first embodiment.

[0054] Each processing function in the diagnostic system 19 may be realized by a processing circuit. The processing circuit includes at least one processor 100 a and at least one memory 100 b. The processing circuit may include at least one dedicated hardware 200 in addition to or in place of the processor 100 a and the memory 100 b.

[0055] When the processing circuit includes a processor 100a and a memory 100b, the functions of the diagnostic system 19 are implemented by software, firmware, or a combination of software and firmware. At least one of the software and firmware is written as a program. The program is stored in the memory 100b. The processor 100a implements the functions of the diagnostic system 19 by reading and executing the program stored in the memory 100b.

[0056] The processor 100a is also called a CPU (Central Processing Unit), processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 100b is composed of non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, or EEPROM.

[0057] Where the processing circuitry comprises dedicated hardware 200, the processing circuitry may be implemented, for example, as a single circuit, multiple circuits, a programmed processor, parallel programmed processors, an ASIC, an FPGA, or a combination thereof.

[0058] Each processing function in the diagnostic system 19 can be realized by a processing circuit. Alternatively, all functions of the diagnostic system 19 can be realized collectively by a processing circuit. Some of the functions of the diagnostic system 19 may be realized by dedicated hardware 200, and other parts may be realized by software or firmware. In this way, the processing circuit realizes each function of the diagnostic system 19 by dedicated hardware 200, software, firmware, or a combination of these.

[0059] The content output system according to the present disclosure can be applied to an elevator.

[0060] DESCRIPTION OF SYMBOLS 1 Elevator, 2 Hoistway, 3 Landing, 4 Landing door, 5 Landing door panel, 6 Landing threshold, 7 Hoisting machine, 8 Main rope, 9 Cage, 10 Counterweight, 11 Control panel, 12 Cage door, 13 Door drive device, 14 Cage door panel, 15 Cage threshold, 16 Remote monitoring device, 17 Communication network, 18 Central control unit, 19 Diagnostic system, 20 Environmental sensor, 21 Measurement unit, 22 Correction unit, 23 Acquisition unit, 24 Calculation unit, 25 Determination unit, 26 Alarm unit, 27 Management unit, 100a Processor, 100b Memory, 200 Dedicated hardware

Claims

1. A measurement unit that measures a door torque when opening and closing an elevator door at each certain opening angle between fully closed and fully open; an acquisition unit that acquires an offset value for individually correcting the measurement value of the door torque by the measurement unit for each opening degree based on environmental information including at least one of temperature and humidity when the measurement unit measures the door torque; a correction unit that corrects a measurement value of the door torque by the measurement unit using the offset value; a determination unit that determines an abnormality in the door torque when a difference between the door torque value corrected by the correction unit and a preset reference value is greater than a preset threshold value; An elevator diagnostic system comprising:

2. The acquisition unit acquires the environmental information from an external weather information service. The elevator diagnostic system according to claim 1.

3. An environmental sensor that is disposed in the elevator shaft and measures the environmental information. Equipped with The acquisition unit acquires the environmental information from the environmental sensor. The elevator diagnostic system according to claim 1.

4. a calculation unit that calculates the offset value based on the environmental information received from the acquisition unit Equipped with The acquisition unit acquires the offset value from the calculation unit. The elevator diagnostic system according to any one of claims 1 to 3.

5. The acquisition unit provides the environmental information to an external arithmetic device, and acquires, from the arithmetic device, the offset value calculated by the arithmetic device based on the environmental information. The elevator diagnostic system according to any one of claims 1 to 3.

6. A measurement step of measuring a door torque when opening and closing an elevator door at each certain opening angle between fully closed and fully open; an acquisition step of acquiring an offset value for individually correcting the measurement value of the door torque in the measurement step for each opening degree based on environmental information including at least one of temperature and humidity information at the time when the door torque is measured in the measurement step; a correction step of correcting a measurement value of the door torque in the measurement step by the offset value; a determination step of determining an abnormality in the door torque when a difference between the door torque value corrected in the correction step and a preset reference value is greater than a preset threshold value; The elevator diagnostic method includes: