A domestic elevator

Abstract

This invention relates to a home elevator, comprising a controller, an energy storage module, a motor, and a door operator. The motor includes a brake and a frequency converter. The controller includes a main control unit and a charging unit, which are connected to the frequency converter, energy storage module, door operator, and brake. The charging unit converts mains power into low-voltage output and is connected to the power supply terminals of the frequency converter, door operator, and energy storage module to supply power to these terminals. The energy storage module is connected to the main control unit, frequency converter, and door operator to supply power to these components. The operating voltage of both the motor and door operator is less than or equal to 56V. The home elevator provided by this invention offers higher energy efficiency during normal operation and longer operating range in the event of a power outage; it also prevents elevator entrapment incidents, improving user safety.

Description

Technical Field

[0001] This invention relates to a home elevator. Background Technology

[0002] Traditional elevators use AC220V / AC380V power supplies, and traditional elevator drive methods include... Figure 4 The elevator's drive unit—the traction machine—is controlled by a controller via 220V or 380V AC mains power, enabling the elevator to move up and down. In the event of a sudden power outage, the elevator will cease operation. This is especially problematic in home elevators. If only one person is trapped inside the car during a power outage, and no one else is home with their mobile phone, the trapped person cannot call for help. If the trapped person remains trapped for an extended period without power, it can lead to extremely serious consequences. Summary of the Invention

[0003] The purpose of this invention is to provide an improved home elevator to solve the problems of poor user safety and inability to function properly when the mains power is interrupted.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A home elevator includes a controller, an energy storage module, a motor, and a door operator. The motor includes a brake and a frequency converter. The controller includes a main control unit and a charging unit connected to the main control unit. The main control unit is connected to the frequency converter, the energy storage module, the door operator, and the brake. The charging unit converts mains power into low-voltage output and is connected to the power supply terminals of the frequency converter, the door operator, and the energy storage module to supply power to these terminals. The energy storage module is connected to the main control unit, the frequency converter, and the door operator to supply power to them. The operating voltage of both the motor and the door operator is less than or equal to 56V.

[0005] Preferably, the home elevator has two power supply modes, including: Mains power mode: Mains power is converted into low-voltage output by the charging unit and supplied to the elevator system. When the elevator car is stopped, the charging unit charges the energy storage module; when the elevator car is moving, the charging unit does not charge the energy storage module. Endurance mode: The energy storage module supplies power to the elevator system.

[0006] Preferably, the amount of electricity in the energy storage module is divided into a first electricity threshold, a second electricity threshold, a third electricity threshold, and a fourth electricity threshold. The amount of electricity within the first electricity threshold is greater than the amount of electricity within the second electricity threshold, the amount of electricity within the second electricity threshold is greater than the amount of electricity within the third electricity threshold, and the amount of electricity within the third electricity threshold is greater than the amount of electricity within the fourth electricity threshold. When there is mains power, if the amount of electricity in the energy storage module is greater than or equal to the first power threshold, the elevator system enters the continuous operation mode and begins to consume the power of the energy storage module. When mains power is available, if the amount of electricity in the energy storage module is less than the second power threshold, the elevator system enters mains power mode. When the mains power fails, if the energy storage module's power is greater than the third power threshold, the elevator enters the continuous operation mode; if the energy storage module's power is greater than or equal to the fourth power threshold and less than the third power threshold, the elevator enters the automatic rescue state. In the automatic rescue state, the car can reach the designated floor and the door operator will open the door. If the power in the energy storage module is less than the fourth power threshold, the energy storage module will provide power to the brake to rescue the car by self-propelled movement. The car will then reach the nearest floor at a low speed and cause the door operator to open the door.

[0007] Preferably, when the main control unit detects that the energy storage module is at full charge, the elevator will stop running until the energy storage module is below full charge, at which point the elevator will automatically return to normal operation. This is to address the situation when the energy storage module is at full charge during the initial installation of the elevator. Preferably, when the motor brakes to generate electricity, the electrical energy is transmitted to the energy storage module through the frequency converter.

[0008] Preferably, when the temperature of the energy storage module exceeds a set value, the main control unit controls the elevator to stop running.

[0009] Preferably, the energy storage module is installed in combination with the motor, or the energy storage module is installed in combination with the controller, or the energy storage module is installed separately in the wellbore.

[0010] Preferably, the motor's brake power supply, the motor's power supply, the motor's frequency converter, and the door operator system are all low-voltage to adapt to the operation of the entire elevator system in the extended operating mode.

[0011] Preferably, the control unit can record the cumulative operating time of the elevator. When a certain cumulative operating time is reached, a fault code will be issued to prompt the user to replace the energy storage module. Alternatively, in the elevator's extended operating mode, if the number of times the energy storage module's power is less than the fourth power threshold exceeds a set value, the main control unit will issue a fault code to prompt the user to replace the energy storage module.

[0012] Preferably, the control unit has an interface to directly supply power to the motor's brake, allowing the elevator car to roll away on its own in case of inverter and energy storage module failure, facilitating the replacement of the inverter and energy storage module.

[0013] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The home elevator provided by this invention, by setting up a controller, energy storage module, motor, and door operator, has a charging unit used to convert mains power into low voltage output to the frequency converter, door operator, and energy storage module. The energy storage module is used to supply power to the frequency converter and door operator. The elevator can adapt to low-voltage power supply, making it safer. When the mains power fails, the energy storage module's power supply to the elevator system will not immediately interrupt the elevator's operation, ensuring the elevator's normal operation and preventing elevator entrapment incidents, thus improving user safety. The elevator can have higher energy efficiency during normal operation and longer operating range in the event of a power outage. Attached image description; Appendix Figure 1 A schematic diagram showing that the energy storage module of the home elevator provided by the present invention is a battery; Appendix Figure 2 A schematic diagram of the space formed by the shaft wall, shaft top, and shaft bottom of the home elevator provided by the present invention; Appendix Figure 3 A schematic diagram of the space occupied by the elevator car of the home elevator provided by the present invention; Appendix Figure 4 A schematic diagram of the power supply system for an existing home elevator.

[0015] In the attached diagram: 1-Energy storage module, 2-Car, 3-Hoistway. Detailed Implementation

[0016] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In one embodiment of the present invention, a home elevator is provided, including a controller, an energy storage module, a motor, a door operator, a counterweight, and a car, specifically: The motor includes a brake and a frequency converter. The operating voltage of the brake and the frequency converter is less than or equal to 56V. For example, the input voltage of the frequency converter is greater than or equal to 48V but less than or equal to 56V, and the output voltage is less than or equal to 32V. In some implementations, the operating voltage of the frequency converter is 48V, and it is not necessary to place the frequency converter in a control cabinet. The operating voltages of the motor's brake power supply, the motor's power supply, the motor's frequency converter, and the door operator system are all low voltage, such as less than or equal to 56V, to adapt to the operation of the entire elevator system in continuous operation mode.

[0019] The gantry crane operates at a voltage of 56V or less (originally 220V). In some implementations, the gantry crane is powered by 48V and outputs 32V. The gantry crane is modified to operate on lower voltage.

[0020] The controller includes a main control unit and a charging unit connected to the main control unit. The main control unit is also connected to the frequency converter, energy storage module, gantry crane, and brake. The main control unit controls the frequency converter, energy storage module, gantry crane, and brake. The user's mains power (AC 220V-380V) is converted into low-voltage output by the charging unit (the charging unit can convert the received power to low-voltage power, such as converting AC 220V to 56V or below). The charging unit supplies power to the power terminals of the frequency converter, gantry crane, and energy storage module.

[0021] The energy storage module is connected to the main control unit, frequency converter, and door operator to supply power to the frequency converter, door operator, and charging unit. For example, the power supply end of the energy storage module is connected to the frequency converter and door operator, and the communication end of the energy storage module is connected to the main control unit.

[0022] In this example, the home elevator has two power supply modes, including the following: Mains power mode: The user's mains power is converted into low-voltage output by the charging unit and supplied to the elevator system. When the car is stopped, the charging unit charges the energy storage module. When the elevator car is running, the charging unit does not charge the energy storage module.

[0023] Endurance mode: The energy storage module supplies power to the elevator system, that is, it supplies power to all components in the elevator that require electricity to operate, such as the traction machine, door operator, car top box, light curtain, external sign box, and speed governor.

[0024] Furthermore, the energy storage module's internal power is divided into a first power threshold, a second power threshold, a third power threshold, and a fourth power threshold. The first power threshold is greater than the second power threshold, the second power threshold is greater than the third power threshold, and the third power threshold is greater than the fourth power threshold. The first power threshold has a certain margin between it and full capacity to prevent the energy storage module from malfunctioning due to excess power fed back from the traction machine. The area between the second power threshold and the first power threshold is the operating range in mains power mode.

[0025] When there is mains power, if the main control unit determines that the energy storage module has enough power but is not fully charged, it is recorded as the first power threshold. If the first power threshold is less than the full power, for example, 90% of the full power, the charging unit stops charging the energy storage module, and the elevator system enters the continuous operation mode.

[0026] When mains power is available, if the main control unit determines that the energy storage module is less than half full of power, it is recorded as the second power threshold, for example, 80% of the full power. When the energy storage module is not at the second power threshold: the elevator system enters mains power mode; if the car is running normally, the charging unit does not charge the energy storage module; if the car is stopped, the charging unit charges the energy storage module.

[0027] When the mains power fails, the elevator system enters the continuous operation mode. When the main control unit determines that the energy storage module has only a small amount of power, enough for the car to run up and down a few times, the door operator can open the door. This is recorded as the third power threshold, for example, 30% of the full power. When the energy storage module's power is less than the third power threshold but higher than the fourth power threshold, the car can reach the designated floor. After the car reaches the designated floor, the door operator opens the door to let people in.

[0028] The fourth power threshold takes into account battery aging. In the event of a power outage, the energy storage module's power is insufficient to allow the car to run up and down a few times. This is recorded as the fourth power threshold, for example, 15% of the full power. If the power in the energy storage module is less than the fourth power threshold, the car is rescued by supplying power to the brake and using a self-propelled mechanism. The car then reaches the nearest floor at a low speed, and the door operator opens the door.

[0029] Throughout the elevator's operation, the energy storage module's power level fluctuates between four power thresholds, continuously absorbing and consuming the electrical energy generated by the motor, thus playing a role in energy feedback and energy saving.

[0030] In this example, the values ​​of the first power threshold, the second power threshold, the third power threshold, and the fourth power threshold can all be modified by the main control unit. For example, the main control unit can calculate the elevator power generation capacity by using the motor parameters and the elevator lifting height parameters, thereby obtaining the maximum value of the first power threshold. The value of the first power threshold cannot be manually modified to be greater than this value.

[0031] Additional note: When the main control unit detects that the energy storage module is fully charged, the elevator will stop running; it will automatically resume normal operation once the energy storage module's charge level is less than full. Even when fully charged, the energy storage module should have sufficient storage space to cope with the forced charging during motor generation, preventing overcharging and damage to the module.

[0032] When the mains power fails, the controller sends a power-off signal to the frequency converter, causing the frequency converter to use the energy storage module for power supply. The energy storage module supplies power to the elevator system, ensuring the normal operation of the elevator.

[0033] In this example, the main control unit has a power supply protection function. When the motor is generating electricity through braking, the electrical energy is transmitted to the energy storage module via the frequency converter, saving energy and achieving energy recovery. Initially, the energy storage module is usually fully charged. If the main control unit detects that the energy storage module is fully charged, it will stop the elevator, and the car will run at low speed to the nearest floor, opening the door operator to dissipate some of the electricity in the energy storage module, and then reporting a fault to indicate the current status. If the main control unit detects that the energy storage module is not fully charged, the elevator will operate normally. The purpose of this operation is that when the motor is generating electricity through braking, the electrical energy is transmitted to the energy storage module via the frequency converter. If the energy storage module is fully charged, the continuous transmission of electrical energy will damage it. Therefore, the energy storage module should not be fully charged; it should have sufficient storage space to cope with the forced charging during motor generation, preventing overcharging and damage to the energy storage module. In existing elevator structures, the electrical energy generated by the motor during braking is transferred to a resistor box. In this example, a resistor box can be omitted, and the motor's electrical energy can be directly transferred to an energy storage module to store electrical energy and achieve energy saving, thereby realizing energy recovery and simplifying the structure.

[0034] Under normal mains power conditions, the two power system operating modes are dynamically switched. When the energy storage module has sufficient power, it will be used as the power source. When the energy storage module is determined to have less than half its power, it will switch to low-voltage mains power mode. In this mode, when the motor brakes to generate electricity, the electrical energy is transmitted to the energy storage module through the frequency converter, and the stored electrical energy plays a role in extending the elevator's range and saving energy. In the event of a mains power outage, the entire elevator system can be powered entirely by the energy storage module. In this case, the energy storage module plays a stronger role in extending the elevator's range when the motor generates electricity. When the energy storage module's power is determined to be insufficient to operate the entire elevator system, sufficient power will be reserved to allow the elevator car to move to the nearest floor, the door operator to open, and passengers inside the car to leave. This is especially important in cases where only one person is trapped inside the car during a power outage and no one is home or carrying a mobile phone, ensuring the passenger's safe evacuation.

[0035] The sufficient power in the aforementioned energy storage module can be located at the first power threshold and the second power threshold; the energy storage module is judged to have less than half of its power when the power is located between the second power threshold and the third power threshold.

[0036] Furthermore, when the temperature of the energy storage module exceeds the set value, the main control unit controls the elevator to stop running, and the car reaches the nearest floor at a low speed and opens the door operator. At this time, the energy storage module may be damaged and its lifespan is nearing its end; a fault reminder will be issued to replace the new energy storage module. This fault cannot be automatically reset and requires manual confirmation to reset.

[0037] Furthermore, the main control unit can record the cumulative running time of the elevator. When the set cumulative running time of the elevator is reached, the main control unit issues a fault code to prompt the user to replace the energy storage module. Alternatively, when the home elevator is in continuous operation mode, if the number of times the energy storage module's power is less than the fourth power threshold is greater than the set value, the main control unit issues a fault code to prompt the user to replace the energy storage module.

[0038] By setting up controllers and energy storage modules, the operating voltage of the motor and gantry crane is kept below 56V. For example, the brake control uses DC24V (originally 110 / 220V), and the maximum input voltage of the motor is 32V. The motor is a permanent magnet synchronous motor. In this case, the motor is modified to be suitable for low voltage electricity. The technical means adopted is to reduce the number of turns. Reducing the number of turns will reduce the back EMF. The reduced back EMF will reduce the rated voltage accordingly. In addition, in order to ensure the slot fill factor, the number of enameled wires is increased and the number of parallel branches is increased, which can ensure that the rated torque remains unchanged (meeting the rated requirements).

[0039] Specifically: the number of turns per component of the motor is less than or equal to 30; the number of conductors per slot of the motor is less than or equal to 60; the stator coil of the motor is made of multi-strand enameled wire, the wire gauge of the motor coil is n-Φr, the diameter Φ is less than or equal to 0.75mm, and n is less than or equal to 10; the number of parallel branches of the motor is less than or equal to 2.

[0040] The gantry crane system operates at 48V (originally 220V). During power outages, the 220V output to the frequency converter is no longer used; instead, 56V is directly supplied. The low-voltage safety circuit features a speed-regulating electrical drive system with a Safe Torque Cancellation (STO) function as specified in GB / T12668.502—2013, 4.2.2.2. The safety integrity level of this STO function should reach SIL3, and the hardware fault margin should be at least 1. Therefore, a small relay can control it using 24V (originally 110V). Energy feedback: The charging unit converts 220V to 48V to charge the energy storage module, and the energy storage module no longer feeds back to the grid.

[0041] In this example, by setting up a controller, energy storage module, motor, and door operator, the elevator is made compatible with low-voltage power supply. The elevator operates on low-voltage power, which has the following advantages: First, the maximum charging voltage of the 48V energy storage module is 56V, which is very close to 60V. If the voltage exceeds 60V, it will have a serious impact on the human body when contact is made. In other words, 60V is the highest safe voltage, so no additional voltage protection is needed. Low-voltage DC is safer. Second, insulation-related costs are reduced. The insulation of cables and the enameled wire of the motor can be downgraded, which reduces costs.

[0042] The duration of elevator operation varies depending on the capacity of the energy storage module. This invention solves the problem of maintaining normal elevator operation for a certain period of time when the 220V or 380V mains power fails, preventing immediate interruption of elevator operation and avoiding elevator entrapment incidents.

[0043] Furthermore, the controller also includes a voltage conversion unit, which is connected to both the main control unit and the charging unit. The voltage conversion unit is used to convert the voltage of the charging unit. The DC power supply voltage output by the voltage conversion unit includes any one of 12V, 15V, 24V, 32V, 36V, and 48V. For example, the voltage conversion unit converts the DC48V converted by the charging unit into DC24V to supply the power supply terminals of the frequency converter, the door machine, and the energy storage module.

[0044] The controller also includes a terminal block with multiple connectors for connecting to the frequency converter, door operator, and energy storage module. The terminal block also features a brake release button. In case of a fault in the frequency converter or energy storage module, the brake can be released momentarily in the elevator's emergency power mode using this button.

[0045] Furthermore, the controller also includes a detection unit connected to the main control unit. The detection unit is used to detect whether the mains power is interrupted, the power and voltage of the energy storage module, and sends the control results to the main control unit. The main control unit controls the energy storage module to work according to the detection results. For example, if a power interruption is detected, the main control unit controls the energy storage module to supply power to the elevator system; or if the voltage of the energy storage module is detected to be lower than DC48V or the power of the energy storage module is less than 15%, the elevator will stop at the nearest level, the door operator will open, and people can leave the car.

[0046] The energy storage module can be installed in combination with the motor, or in combination with the controller, or installed independently at any location in the shaft. See [link / reference]. Figures 1-3 The energy storage module 1 is located in the space formed by the top of the shaft, the bottom of the shaft, and the wall of the shaft 3, or the distance between the energy storage module and the elevator drive host is less than or equal to 10m, including but not limited to the wall of the shaft 3, on the guide rail, on the host side, on the guide rail bracket, etc.

[0047] The energy storage module includes batteries or capacitors. It can be charged during off-peak hours such as at night and discharged during peak hours to drive the elevator. In normal mode, the battery only starts charging to 90% when its charge level is below 80% (if energy feedback occurs when the battery is fully charged, the inverter, without a braking resistor, will experience voltage rise and is prone to failure, and the battery may burn). The elevator car does not charge the battery while running; charging only occurs when the battery level is below 80% and the elevator is not running (charging while using electricity reduces battery life). The off-peak charging function not only saves electricity but also maintains the battery. When the off-peak charging function is activated, the battery will be charged to 90% when its charge level is below 30% or its voltage is below 48V, and when the car is stopped (using the battery until it is almost fully charged increases battery life).

[0048] In this example, it is suitable for emergency rescue. In the event of a sudden power outage, energy feedback can extend the power supply time, allowing it to operate normally for at least 3 hours. For low-frequency use elevators such as those in villas, the elevator can operate normally for at least 1 day. It can also be used in conjunction with off-peak charging to significantly save users' electricity costs.

[0049] The main control unit of the controller can activate corresponding functions through parameters. In conjunction with local power company preferential policies, charging periods can be set, and the elevator is powered by the energy storage module power supply system during non-charging periods. When the energy storage module voltage is lower than DC48V or the energy storage module charge is less than 30%, the main control unit will disable this function and continue to allow the grid to power the elevator system.

[0050] The controller consists only of a main control unit, a charging unit, a voltage conversion unit, and a terminal block. It separates the frequency converter and power outage rescue module (existing control cabinets house these components, resulting in a bulky design). The controller itself is located within the control cabinet. The frequency converter and power outage rescue module are no longer placed inside the control cabinet; instead, the frequency converter connects to the traction machine and is placed on one side of the machine, eliminating the need for a separate control cabinet. This reduces the size of the control cabinet and facilitates installation.

[0051] The home elevator power supply device in this example, in conjunction with the energy storage module, can combine emergency operation during power outages, electric brake release, and energy feedback functions to achieve emergency rescue, electric brake release, and power supply protection, saving both costs and installation space for the energy feedback device.

[0052] In this example, solar energy, wind energy, and mains power can also be used to power the energy storage module. The energy storage module can also supply power to the external signal box, speed limiter, car top box (operating voltage 24V, 48V), and light curtain (operating voltage 24V).

[0053] Furthermore, the main control unit is also equipped with an interface that connects to an additional device. This interface directly supplies power to the motor's brake, allowing the elevator car to roll away on its own in case of inverter or energy storage module failure, facilitating the replacement of the inverter and energy storage module.

[0054] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A home elevator, characterized in that, The system includes a controller, an energy storage module, a motor, and a door operator. The motor includes a brake and a frequency converter. The controller includes a main control unit and a charging unit connected to the main control unit. The main control unit is connected to the frequency converter, the energy storage module, the door operator, and the brake. The charging unit converts mains power into low-voltage output and is connected to the power supply terminals of the frequency converter, the door operator, and the energy storage module to supply power to these terminals. The energy storage module is connected to the main control unit, the frequency converter, and the door operator to supply power to these terminals. The operating voltage of both the motor and the door operator is less than or equal to 56V; The home elevator has two power supply modes, including: Mains power mode: Mains power is converted into low-voltage output by the charging unit and supplied to the elevator system. When the elevator car is stopped, the charging unit charges the energy storage module; when the elevator car is moving, the charging unit does not charge the energy storage module. Endurance mode: The energy storage module supplies power to the elevator system; The energy storage module's power is divided into a first power threshold, a second power threshold, a third power threshold, and a fourth power threshold. The power value within the first power threshold is greater than the power value within the second power threshold, the power value within the second power threshold is greater than the power value within the third power threshold, and the power value within the third power threshold is greater than the power value within the fourth power threshold. When there is mains power, if the amount of electricity in the energy storage module is greater than or equal to the first power threshold, the elevator system enters the continuous operation mode and begins to consume the power of the energy storage module. When mains power is available, if the amount of electricity in the energy storage module is less than the second power threshold, the elevator system enters mains power mode. When the mains power fails, if the energy storage module's power is greater than the third power threshold, the elevator enters the continuous operation mode; if the energy storage module's power is greater than or equal to the fourth power threshold and less than the third power threshold, the elevator enters the automatic rescue state. In the automatic rescue state, the car can reach the designated floor and the door operator will open the door. If the power in the energy storage module is less than the fourth power threshold, the energy storage module supplies power to the brake, the car reaches the nearest floor, and the door operator opens the door.

2. The home elevator according to claim 1, characterized in that, When the main control unit detects that the energy storage module has a full charge, the elevator stops running; when the energy storage module has a charge less than full, the elevator runs.

3. The home elevator according to claim 1, characterized in that, When the motor brakes and generates electricity, the electrical energy is transmitted to the energy storage module through the frequency converter.

4. The home elevator according to claim 1, characterized in that, When the temperature of the energy storage module exceeds a set value, the main control unit controls the elevator to stop running.

5. The home elevator according to claim 1, characterized in that, The energy storage module is installed in combination with the motor, or in combination with the controller, or the energy storage module is installed separately in the wellbore.

6. The home elevator according to claim 1, characterized in that, The operating voltage of the motor's brake power supply, the motor's power supply, the motor's frequency converter, and the gantry crane is all less than or equal to 56V.

7. The home elevator according to claim 1, characterized in that, The main control unit can record the elevator's cumulative running time. When the set cumulative running time is reached, the main control unit issues a fault code to prompt the user to replace the energy storage module.

8. The home elevator control unit according to claim 7, characterized in that, When the home elevator is in continuous operation mode, if the number of times the energy storage module's power level is lower than the fourth power threshold exceeds a set value, the main control unit will issue a fault code to prompt the user to replace the energy storage module.

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