Elevator Internet of Things communication system and control method thereof

Abstract

The invention relates to an elevator Internet of Things communication system control method. The method comprises the steps that S1, the voltage of a main power source and state data of an elevator controller are obtained; s2, identifying the instantaneous drop rate of the voltage of the main power supply at each moment, and meanwhile, sending the state data through a north bridge channel; s3, when the instantaneous drop rate exceeds a preset rate threshold value, time delay is set, and if the voltage of the main power supply is recovered to rated voltage during the time delay period, S7 is executed; if the voltage of the main power supply is not recovered after the time delay is ended, executing S4; s4, switching to a standby power supply for power supply; s5, recording the duration time of the power supply interference event, and further reducing the standby power consumption of a north row channel when the duration time reaches a first time node; s6, when the duration reaches a second time node, enabling the north channel to enter a deep dormant state; and S7, supplying power to the system by adopting a main power supply. According to the elevator Internet of Things communication system control method, uninterrupted communication of the elevator can be achieved.

Description

Technical Field

[0001] This invention relates to the field of Internet of Things (IoT) communication technology, and in particular to an elevator IoT communication system and its control method. Background Technology

[0002] With the development of IoT technology, elevator remote monitoring systems have become a core means of ensuring the safe operation of elevators. Existing elevator IoT modules generally rely on mains power and use 4G / 5G networks for data transmission. However, when the elevator's mains power is interrupted due to fluctuations in mains power, line faults, maintenance, or emergency power outages, these modules immediately fail, resulting in the loss of elevator status data before the power outage and at the moment of power restoration. This lack of crucial evidence for fault analysis makes remote diagnosis and pre-processing impossible, thus prolonging fault recovery time. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide an elevator Internet of Things communication system and its control method.

[0004] An elevator Internet of Things (IoT) communication system control method includes S1: the controller controls the power supply detection module to obtain the main power supply voltage at a voltage detection frequency, and controls the southbound channel to obtain the elevator controller's status data at a status detection frequency; S2: The controller identifies the instantaneous drop rate of the main power supply voltage at each moment and sends the status data through the Northbridge channel; the instantaneous drop rate is obtained by subtracting the main power supply voltage of the previous moment from the current moment's main power supply voltage and dividing by the time interval; S3: When the instantaneous drop rate exceeds a preset rate threshold, the controller sets a delay. If the main power supply voltage recovers to the rated voltage during the delay, step S7 is executed. If the main power supply voltage still fails to recover after the delay, a complete power failure is determined to have occurred, and step S4 is executed. S4: Switch to backup power supply; at the same time, the northbound channel reduces power consumption, stops sending data, and saves any data that has not yet been successfully sent. S5: The controller records the duration of the complete power outage. When the duration reaches the first time node, it further reduces the standby power consumption of the northbound channel and extends the heartbeat interval; and executes step S7 when the main power supply voltage is restored. S6: When the duration reaches the second time node, the northbound channel enters a deep sleep state and is only woken up by the controller; at the same time, the power detection module reduces the voltage detection frequency, and the southbound channel reduces the status detection frequency of the elevator main controller status data; when the main power supply voltage is detected to be restored, step S7 is executed. S7: The system is powered by the main power supply. The main power supply voltage and elevator main controller status data are acquired at the voltage detection frequency and status detection frequency, respectively. The power of the northbound channel is restored and data is transmitted. At the same time, the backup power supply is checked to see if it is fully charged. If the backup power supply is not fully charged, it is charged by the main power supply.

[0005] Compared with existing technologies, the elevator IoT communication system control method of the present invention can effectively cope with sudden accidents of the main power supply to maintain effective data storage, maintain the ability to send data to the outside when the elevator malfunctions, accurately identify main power supply interference events, avoid frequent power supply switching that causes the backup power supply to be damaged too quickly, and effectively protect the backup power supply.

[0006] Furthermore, during the cycle of discharging and fully charging the backup power supply, different loss coefficients are assigned to the discharge amount based on the temperature of the backup power supply to obtain the equivalent loss, and the cycle is recorded as complete when the equivalent loss reaches the rated capacity of the backup power supply; the expression for the equivalent loss is: , Wherein, E is the equivalent loss, and U is the discharge amount at different temperatures; The loss coefficient is denoted by .

[0007] Furthermore, before or after charging the backup battery, a known constant current small pulse load is applied to the backup battery, and the voltage before and after the application is recorded. The internal resistance and the increase ratio of the current internal resistance relative to the preset standard internal resistance are calculated, and the remaining capacity is corrected by comparing it with the internal resistance-lifetime correspondence table. The internal resistance calculation formula is: , in, The internal resistance of the backup power supply The voltage before the load is applied. The voltage after the load is applied. This represents the current value of a small pulse load.

[0008] Furthermore, the temperature of the backup power supply is obtained through a temperature detection unit, and the controller corrects the capacity of the backup power supply in real time according to its temperature based on different temperature-capacity mapping curves.

[0009] Furthermore, during the charging process, the rate of temperature change between the backup power supply at each moment and the temperature at the previous moment is detected, and charging is stopped when the rate of temperature change suddenly increases.

[0010] Furthermore, during the charging process of the backup power supply, the rate of change of the voltage of the backup power supply at each moment compared to the previous moment is detected. When the rate of change of the voltage changes from positive to negative (a negative voltage drop phenomenon), the backup power supply is fully charged, and the connection between the backup power supply and the main power supply is disconnected to prevent the backup power supply from being overcharged.

[0011] Furthermore, while the northbound channel is activated to send data, it also receives instructions from the cloud server, enabling uninterrupted communication of the IoT system.

[0012] Furthermore, during the data transmission process via the northbound channel, the controller stores the data in the memory before transmitting the data via the northbound channel, and deletes the data from the memory after transmission is complete.

[0013] Based on the same inventive concept, this invention also provides an elevator IoT communication system, including a main power supply, a backup power supply, a power supply detection module, a south-going channel, a north-going channel, a controller, and a memory; the power supply detection module detects the main power supply voltage of the main power supply; the south-going channel acquires the status data of the elevator main controller; the north-going channel transmits data; the controller connects to the power supply detection module, the south-going channel, and the north-going channel, analyzes the main power supply voltage, processes the status data, and transmits it through the north-going channel; simultaneously, the controller controls the power supply switching between the main power supply and the backup power supply; the main power supply, backup power supply, power supply detection module, south-going channel, north-going channel, and controller jointly execute the elevator IoT communication system control method described above.

[0014] Based on the same inventive concept, the present invention also provides an electronic device, including a processor; a memory for storing a computer program executed by the processor; wherein, when the processor executes the computer program, it implements the elevator Internet of Things communication system control method described above. Attached Figure Description

[0015] Figure 1 This is a flowchart of the control method of the present invention; Figure 2 This is a schematic diagram of the temperature-capacity curve for a backup power supply. Detailed Implementation

[0016] To address the issue that current elevator IoT communication systems cannot effectively identify, save, and communicate elevator status during power outages, the inventors designed an elevator IoT communication system and its control method, enabling continuous monitoring and communication of the elevator even during power outages.

[0017] Specifically, an elevator Internet of Things (IoT) communication system of the present invention includes a main power supply, a backup power supply, a power supply detection module, a southbound channel, a northbound channel, and a controller; the power supply detection module acquires the voltage data of the main power supply, the voltage data, current data, and temperature of the backup power supply, and includes a main power supply voltage detection unit, a backup power supply voltage detection unit, a backup power supply discharge current detection unit, and a temperature detection unit.

[0018] The main power supply is connected to the mains power and supplies power to all devices in the system.

[0019] The backup power supply uses a low self-discharge nickel-metal hydride battery pack with a rated voltage of 3.6V.

[0020] The main power supply and the backup power supply are switched under the control of the controller. When the main power supply fails to provide power, the system is switched to the backup power supply.

[0021] The main power supply voltage detection unit acquires its voltage signal and outputs it to the controller. It includes a voltage sensor and a signal conditioner. The voltage sensor detects the original voltage signal of the main power supply, and the signal conditioner processes the original voltage signal to obtain the main power supply voltage data and outputs it to the controller.

[0022] The backup power supply voltage detection unit acquires its voltage signal and outputs it to the controller. It includes a voltage sensor and a signal conditioner. The voltage sensor detects the original voltage signal of the backup power supply, and the signal conditioner processes the original voltage signal to obtain backup power supply voltage data and outputs it to the controller.

[0023] The backup power supply discharge current detection unit acquires its current signal and outputs it to the controller. It includes a current sensor and a signal conditioner. The current sensor detects the original current signal of the backup power supply, and the signal conditioner processes the original current signal to obtain current data and outputs it to the controller.

[0024] The temperature detection unit acquires the temperature information of the backup power supply and outputs it to the controller. It includes a temperature sensor and a signal conditioner. The temperature sensor detects the raw temperature signal of the backup power supply installation area, and the signal conditioner processes the raw temperature signal to obtain temperature data and outputs it to the controller. In this embodiment, the temperature sensor is a negative temperature coefficient thermistor.

[0025] The signal conditioners used in the main power supply voltage detection unit, backup power supply voltage detection unit, backup power supply discharge current detection unit, and temperature detection unit have the same structure, all including an analog signal scaling unit, a filtering unit, and an analog-to-digital conversion unit. The analog signal scaling unit scales the input analog signal; the filtering unit filters the scaled input analog signal; and the analog-to-digital conversion unit is a digital-to-analog converter that converts the scaled and filtered input analog signal into a digital signal for output. Therefore, the main power supply voltage detection unit, backup power supply voltage detection unit, backup power supply discharge current detection unit, and temperature detection unit scale and filter the input signal and convert it into a digital signal for output.

[0026] The southbound passage is equipped with hardware interfaces such as UART and CAN to connect to the elevator's main controller, so as to obtain the elevator main controller's status data and transmit it to the controller, and send the controller's control commands to the elevator main controller.

[0027] The northbound channel connects the controller and the cloud server respectively, transmitting the elevator main controller status data processed by the controller to the cloud server via wired or wireless network, and also receiving instructions from the cloud server and sending them to the controller.

[0028] The memory stores the data written by the controller to prevent loss.

[0029] The controller is a microprocessor that acquires the main power supply voltage, backup power supply voltage, backup power supply current, and backup power supply temperature through the power supply detection module. It also acquires elevator main controller status data and sends instructions to it through the southbound channel, sends data to the cloud server and receives its instructions through the northbound channel, and controls the system's power supply mode. In addition, the controller stores the data and instructions from the southbound and northbound channels in the memory.

[0030] Please see Figure 1 , Figure 1 This is a flowchart of the control method of the present invention. The elevator IoT communication system executes the elevator IoT uninterrupted communication control method of the present invention, specifically including: S1: The controller controls the power supply detection module to acquire the main power supply voltage at a voltage detection frequency, and controls the southbound channel to acquire the elevator controller's status data at a status detection frequency. The controller controls the main power supply voltage detection unit to continuously collect and analyze the main power supply voltage data at a certain frequency. In this embodiment, the initial voltage detection frequency is set to 1kHz to 10kHz.

[0031] S2: The controller identifies the instantaneous rate of drop in the main power supply voltage at each moment; simultaneously, it transmits the status data via the northbound channel. Power supply interference events include voltage dips, momentary power outages, and complete power failures. Most power supply interference events are caused by grid faults or slow fuse blowing, and are often not instantaneous drops to zero, but rather a continuous voltage drop over tens to hundreds of milliseconds; therefore, the controller predicts whether a power supply interference event will occur by calculating the instantaneous rate of drop in the main power supply voltage.

[0032] The controller stores the acquired main power supply voltage at each moment in the memory, subtracts the main power supply voltage at the previous moment from the current moment's main power supply voltage, divides by the time interval to obtain the instantaneous drop rate, and compares it with a rate threshold; when the instantaneous drop rate is lower than the rate threshold, it is determined that there is a high probability of a power supply interference event in the main power supply.

[0033] During data transmission, the controller stores the status data received from the southbound channel into a RAM buffer and then writes it into the transmission queue in the memory. It then attempts to transmit the data via the northbound channel, deleting the data packet upon successful transmission. If transmission fails, the data packet is stored in the memory and retransmitted. Simultaneously, the northbound channel also receives control commands from the cloud server. The controller stores these control commands received from the northbound channel into its memory and then transmits them to the elevator main controller via the southbound channel.

[0034] In this embodiment, the rate threshold for the main power supply to have a risk of voltage sag is set to be greater than 20% and less than 40%; the rate threshold for the main power supply to have a risk of momentary power outage is greater than 40%; if the main power supply fails to recover after a period of time following a momentary power outage, it is determined that the main power supply has completely lost power.

[0035] S3: When the instantaneous drop rate exceeds the preset rate threshold, the controller sets a delay. If the main power supply voltage recovers to the rated voltage during the delay, step S7 is executed. If the main power supply voltage still fails to recover after the delay, a complete power failure is determined to have occurred, and step S4 is executed.

[0036] When the controller analyzes and finds that the instantaneous drop rate is greater than the rate threshold, it indicates that the main power supply voltage has begun to fluctuate slightly. At this time, the detection frequency of the main power supply voltage detection unit is increased, and the instantaneous drop rate is calculated for at least the next two moments. If the instantaneous drop rate continues to be greater than the rate threshold, the controller predicts that a power interference event may occur. Simultaneously, a delay timer is set within the controller to delay the event, and the main power supply voltage is continuously analyzed at each moment during the delay period. If the controller finds that the main power supply voltage has recovered to the rated voltage during the delay period, it continues to use the main power supply and records a voltage disturbance event, which is then sent to the cloud server via the northbound channel. The voltage disturbance event includes the main power supply voltage detected during the delay period. If the controller finds that the main power supply voltage has not recovered to the rated voltage during the delay period, it determines that a power interference event is about to occur. It then stops the data that has not yet been successfully transmitted in the northbound channel and saves it in the memory. Instead, it sends a power interference event warning signal to the cloud server through the northbound channel and controls the northbound channel to enter a low-power mode to improve the controllability of power supply switching.

[0037] By setting a delay timer, the accuracy of judging voltage dips and momentary power outages within a short period of time is improved, avoiding frequent short-term discharges caused by multiple switching of the backup power supply in a short period of time, which can lead to highly destructive pulse-like cycles that affect the lifespan of the backup power supply. In this embodiment, the delay is set to 100ms to 500ms; when the instantaneous drop rate is greater than 20% but less than 40%, the voltage disturbance event is recorded as a voltage dip; when the instantaneous drop rate is greater than 40%, the voltage disturbance event is recorded as a momentary power outage.

[0038] S4: Switch to backup power supply; at the same time, the northbound channel reduces power consumption, stops sending data, and saves the data that has not yet been successfully sent in memory.

[0039] S5: The controller records the duration of the complete power outage. When the duration reaches the first time node, it further reduces the standby power consumption of the northbound channel and extends the heartbeat interval; and executes step S7 when the main power supply voltage is restored. At this time, the controller no longer detects the instantaneous drop rate, but directly detects the main power supply voltage. The heartbeat interval is the event interval for periodically sending heartbeat packets to inform the cloud server that it has not gone offline. The controller starts recording the duration after the delay timer expires, until it reaches the first time node, at which point it controls the northbound channel to retain the network paging function, further reducing power; at the same time, the controller reduces the detection frequency of the main power supply voltage detection unit and the southbound channel, and saves the main power supply voltage and the status data of the elevator main controller in the memory.

[0040] S6: When the duration reaches the second time node, the northbound channel enters a deep sleep state, only waking up when transmitting critical status information; simultaneously, the power supply detection module reduces the voltage detection frequency, and the southbound channel reduces the status detection frequency of the elevator main controller status data; when the main power supply voltage is detected to have recovered, step S7 is executed. The critical status information includes fault codes, backup power supply power alarms, etc. While the northbound channel is awakened to send data and heartbeat packets, it also receives instructions from the cloud server, achieving uninterrupted communication of the IoT system. In this embodiment, the first time node is set to 5 minutes, the second time node is set to 30 minutes, and the heartbeat packet interval is extended to 10 minutes.

[0041] The controller saves the elevator main controller status data obtained by the southbound channel to the memory, while the northbound channel enters a deep sleep state. When the controller detects a fault code in the status data, it wakes up the northbound channel to send the fault code to the cloud server.

[0042] Meanwhile, the controller obtains the discharge amount of the backup power supply through the backup power supply voltage detection unit and the backup power supply current detection unit, calculates the remaining power of the backup power supply, and wakes up the northbound channel to send a power level reminder when the power is low.

[0043] S7: The system is powered by the main power supply. The main power supply voltage and elevator main controller status data are acquired at the voltage detection frequency and status detection frequency, respectively. The northbound channel power is restored and data is transmitted. Simultaneously, the backup power supply is checked for full charge. If the backup power supply is not fully charged, it is charged by the main power supply. When the system transitions from a complete power outage to a state where the main power supply voltage is restored, the controller organizes the data acquired during the complete power outage into a power quality report and sends it to the cloud server via the northbound channel.

[0044] During the charging process of the backup power supply, the rate of change of the voltage of the backup power supply at each moment compared to the previous moment is detected. When the rate of change of the voltage changes from positive to negative (a negative voltage drop phenomenon), the backup power supply is fully charged, and the connection between the backup power supply and the main power supply is disconnected to prevent the backup power supply from being overcharged.

[0045] Further, before charging the backup battery, a known constant-current small pulse load is applied to the backup battery through a MOSFET, and the voltage before and after the application is recorded. The internal resistance and the increase ratio of the current internal resistance relative to the preset standard internal resistance are calculated, and the remaining capacity is corrected by comparing it with the internal resistance-lifetime correspondence table. Then, charging is performed until the backup power supply is fully charged, the charged amount is recorded, and the backup power supply capacity is obtained by combining it with the corrected remaining capacity. Alternatively, after fully charging the backup battery, a known small pulse load is applied to the backup battery, its voltage change and current are measured, and the internal resistance is calculated. The backup power supply capacity is corrected based on this internal resistance and a typical value. The charged amount is calculated using the backup power supply and voltage obtained by the backup power supply voltage detection unit and the backup power supply current detection unit. The internal resistance calculation formula is: , in, The internal resistance of the backup power supply The voltage before the load is applied. The voltage after the load is applied. This represents the current value of a small pulse load.

[0046] In this embodiment, the constant current small pulse load is a current of 0.1C, with a duration of 100 milliseconds, and the internal resistance-lifetime correspondence table is measured at the factory and stored in the controller.

[0047] Further, please refer to Figure 2 , Figure 2 This is a schematic diagram of the temperature-capacity curve of the backup power supply. The temperature of the backup power supply is obtained through a temperature detection unit, and the controller corrects the capacity of the backup power supply in real time according to its temperature based on different temperature-capacity mapping curves.

[0048] Furthermore, during the cycle of discharging and fully charging the backup power supply, different loss coefficients are assigned to the discharge amount based on the temperature of the backup power supply to measure the impact of discharge on battery life at different temperatures.

[0049] The cumulative discharge amount and discharge temperature are used to calculate the number of cycles, and the number of cycles is reported to the cloud server when it approaches the design life of the backup power supply. During each use and full charge of the backup power supply, if the equivalent loss of the accumulated power consumption reaches its rated capacity, the backup power supply is considered to have completed one cycle and is re-accumulated. The equivalent loss is obtained by accumulating different loss coefficients assigned to the actual discharge amount at different temperatures, representing the different effects of discharge at different temperatures on battery life. For example, with a rated capacity of 300mAh, if the discharge amount during the first use is 120mAh, the equivalent loss after considering temperature is 150mAh; after full charge, if the discharge amount during the second use is 100mAh, and the equivalent loss is still 150mAh due to temperature differences, then the battery is considered to have completed one charging cycle because the sum of the two equivalent losses reaches its rated capacity. Any excess capacity is included in the next charging cycle. By using the number of charging cycles as a standard to calculate battery degradation and combining it with backup power supply internal resistance detection for calibration, the remaining power capacity of the backup power supply during use can be more accurately predicted.

[0050] The equivalent loss is expressed as follows: , Wherein, E is the equivalent loss, and U is the discharge amount at different temperatures; The coefficients represent the loss factors at different temperatures. In this embodiment, when the temperature is below 25 degrees Celsius, the battery loss due to charging and discharging is relatively small, and the loss factor is 0.8; when the temperature is between 25 degrees Celsius and 40 degrees Celsius, which is the standard operating temperature, the loss factor is 1.0; when the temperature is between 40 degrees Celsius and 50 degrees Celsius, which is a high-temperature environment, the battery loss is accelerated, and the loss factor is 1.5; when the temperature is above 50 degrees Celsius, the battery loss is extremely fast, and the loss factor is 2.0.

[0051] Furthermore, as the backup power source gradually approaches its lifespan, the charging current and maximum charging capacity are gradually reduced to slow down battery aging.

[0052] In another embodiment, during the charging process, the rate of temperature change between the backup power supply at each moment and the temperature at the previous moment is detected, and charging is stopped when the rate of temperature change suddenly increases.

[0053] Compared with existing technologies, the elevator IoT communication system control method of the present invention can effectively cope with sudden accidents of the main power supply to maintain effective data storage, maintain the ability to send data to the outside when the elevator malfunctions, accurately identify main power supply interference events, avoid frequent power supply switching that causes the backup power supply to be damaged too quickly, and effectively protect the backup power supply.

[0054] This application may take the form of a computer program product implemented on one or more storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing program code. Computer storage media include permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information may be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to: phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0055] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments and claims of this application are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that, unless otherwise stated, “a plurality” means two or more; the terms “first,” “second,” “third,” etc., are used only to distinguish and not to describe a particular order or sequence, nor should they be construed as indicating or implying relative importance. The term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of this application, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A control method for an elevator Internet of Things (IoT) communication system, characterized in that, include: S1: The controller controls the power supply detection module to obtain the main power supply voltage at the voltage detection frequency, and controls the southbound channel to obtain the status data of the elevator controller at the status detection frequency. S2: The controller identifies the instantaneous drop rate of the main power supply voltage at each moment and sends the status data through the Northbridge channel; the instantaneous drop rate is obtained by subtracting the main power supply voltage of the previous moment from the current moment's main power supply voltage and dividing by the time interval; S3: When the instantaneous drop rate exceeds a preset rate threshold, the controller sets a delay. If the main power supply voltage recovers to the rated voltage during the delay, step S7 is executed. If the main power supply voltage still fails to recover after the delay, a complete power failure is determined to have occurred, and step S4 is executed. S4: Switch to backup power supply; at the same time, the northbound channel reduces power consumption, stops sending data, and saves any data that has not yet been successfully sent. S5: The controller records the duration of the complete power outage. When the duration reaches the first time node, it further reduces the standby power consumption of the northbound channel and extends the heartbeat interval; and executes step S7 when the main power supply voltage is restored. S6: When the duration reaches the second time node, the northbound channel enters a deep sleep state and is only woken up by the controller; at the same time, the power detection module reduces the voltage detection frequency, and the southbound channel reduces the status detection frequency of the elevator main controller status data; when the main power supply voltage is detected to be restored, step S7 is executed. S7: The system is powered by the main power supply. The main power supply voltage and elevator main controller status data are acquired at the voltage detection frequency and status detection frequency, respectively. The power of the northbound channel is restored and data is transmitted. At the same time, the backup power supply is checked to see if it is fully charged. If the backup power supply is not fully charged, it is charged by the main power supply.

2. The elevator IoT communication system control method according to claim 1, characterized in that, In the cycle of discharging and fully charging the backup power supply, different loss coefficients are assigned to the discharge amount based on the temperature of the backup power supply to obtain the equivalent loss. A cycle is considered complete when the equivalent loss reaches the rated capacity of the backup power supply. The expression for the equivalent loss is: ， Where E is the equivalent loss and U is the discharge amount at different temperatures; The loss coefficient is denoted by .

3. The elevator IoT communication system control method according to claim 1, characterized in that, Before or after charging the backup battery, a known constant current small pulse load is applied to the backup battery, and the voltage before and after the application is recorded. The internal resistance and the increase ratio of the current internal resistance relative to the preset standard internal resistance are calculated, and the remaining capacity is corrected by comparing it with the internal resistance-lifetime correspondence table. The internal resistance calculation formula is: ， in, The internal resistance of the backup power supply The voltage before applying the load. The voltage after the load is applied. This represents the current value of a small pulse load.

4. The elevator IoT communication system control method according to claim 1, characterized in that, The temperature of the backup power supply is obtained through a temperature detection unit, and the controller corrects the capacity of the backup power supply in real time according to its temperature based on different temperature-capacity mapping curves.

5. The elevator IoT communication system control method according to claim 1, characterized in that, During the charging process, the rate of temperature change of the backup power supply at each moment is detected compared to the temperature at the previous moment. Charging is stopped when the rate of temperature change suddenly increases.

6. The elevator IoT communication system control method according to claim 1, characterized in that, During the charging process of the backup power supply, the rate of change of the voltage of the backup power supply at each moment compared to the previous moment is detected. When the rate of change of the voltage changes from positive to negative (a negative voltage drop phenomenon), the backup power supply is fully charged, and the connection between the backup power supply and the main power supply is disconnected to prevent the backup power supply from being overcharged.

7. The elevator IoT communication system control method according to claim 1, characterized in that, When the northbound channel is activated to send data, it also receives instructions from the cloud server, enabling uninterrupted communication of the IoT system.

8. The elevator IoT communication system control method according to claim 1, characterized in that, During the data transmission process via the northbound channel, the controller stores the data in the memory, then transmits the data via the northbound channel, and deletes the data from the memory after transmission is complete.

9. An elevator Internet of Things (IoT) communication system, characterized in that, Includes main power supply, backup power supply, power supply detection module, southbound channel, northbound channel, controller and memory; The power supply detection module detects the main power supply voltage of the main power supply. The southbound passage acquires the status data of the elevator main controller; The northbound channel transmits data. The controller is connected to the power supply detection module, the southbound channel, and the northbound channel. It analyzes the main power supply voltage, processes the status data, and sends it through the northbound channel. At the same time, the controller controls the power supply switching between the main power supply and the backup power supply. The main power supply, backup power supply, power supply detection module, southbound channel, northbound channel, and controller jointly execute the elevator Internet of Things communication system control method as described in any one of requirements 1-8.

10. An electronic device, characterized in that, processor; Memory for storing computer programs executed by the processor; The processor executes the computer program to implement the elevator Internet of Things communication system control method according to any one of claims 1-8.

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