Control method of water cooling system of electric pressure cooker

Abstract

The invention provides a control method of a water cooling system of an electric pressure cooker, the control method is applied to the electric pressure cooker, the electric pressure cooker comprises the water cooling system and a top temperature sensor, the water cooling system comprises a water tank and a water pump, and the control method comprises the following steps: after the electric pressure cooker finishes cooking, responding to a water cooling pressure reduction control signal, and starting the water pump; the temperature in the electric pressure cooker is measured through the top temperature sensor, and the cooling speed is determined based on the measurement result; and determining the water quantity in the water tank according to the cooling speed. According to the scheme, control over the water cooling system is achieved in a low-cost mode without the help of additional parts.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a control method for a water cooling system of an electric pressure cooker. Background Art

[0002] The water cooling system of the electric pressure cooker is used to cool down the inside of the electric pressure cooker after cooking. In the related scheme, the water cooling system of the electric pressure cooker includes a water tank assembly, and the water tank assembly includes: a water tank, a water pump, a first magnetic part and a second magnetic part. Among them, the attraction of the first magnetic part and the second magnetic part can control whether the motor of the water pump is working, so that the water pump is started when there is water in the water tank to perform water cooling (pressure reduction). The related scheme can meet the water tank full water detection and control the operation of the water pump, and starting the water pump when there is water in the water tank can avoid the safety hazard of idling of the water pump.

[0003] However, the implementation of related solutions requires the use of additional components such as magnetic parts or reed switches, and structural parts are needed to ensure functionality. The structure is complex, the cost is high, and the structural parts also have the risk of failure. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a control method for a water cooling system of an electric pressure cooker, which is used to control the water cooling system in a low-cost manner without the need for additional components.

[0005] A control method for a water cooling system of an electric pressure cooker is applied to an electric pressure cooker, wherein the electric pressure cooker comprises a water cooling system and a top temperature sensor, wherein the water cooling system comprises a water tank and a water pump, and comprises:

[0006] After the cooking of the electric pressure cooker is finished, in response to a water cooling pressure reduction control signal, the water pump is started;

[0007] Measuring the temperature inside the electric pressure cooker by the top temperature sensor, and determining the cooling speed based on the measurement result;

[0008] The amount of water in the water tank is determined according to the cooling speed.

[0009] In one embodiment, after determining the amount of water in the water tank according to the cooling rate, the method further includes:

[0010] If the amount of water in the water tank is not zero, determining whether the temperature measured by the top temperature sensor is less than a preset temperature threshold;

[0011] If so, turn off the water pump.

[0012] In one embodiment, after determining the amount of water in the water tank according to the cooling rate, the method further includes:

[0013] If the amount of water in the water tank is not zero, determining whether the float valve of the electric pressure cooker is in a descending state;

[0014] If so, turn off the water pump.

[0015] In one embodiment, after determining the amount of water in the water tank according to the cooling rate, the method further includes:

[0016] If the amount of water in the water tank is not zero, the water pump is turned off when the running time of the water pump reaches the target waiting time.

[0017] In one embodiment, the method further comprises:

[0018] Determine whether the running time of the water pump reaches a preset waiting time threshold;

[0019] If so, open the pressure limiting valve of the electric pressure cooker.

[0020] In one embodiment, the method further comprises:

[0021] Determining whether the cooling speed is less than a first speed threshold;

[0022] If so, when the water pump ends its operation, the pressure limiting valve of the electric pressure cooker is opened.

[0023] In one embodiment, determining the amount of water in the water tank according to the cooling rate includes:

[0024] Determining whether the cooling speed reaches a water cooling speed threshold;

[0025] If it is not reached, an alarm prompt message is output, and the alarm prompt message indicates that there is no water in the water tank.

[0026] In one embodiment, after outputting the alarm prompt information, the method further includes:

[0027] In response to the pressure-limiting valve opening instruction, the pressure-limiting valve is opened.

[0028] In one embodiment, after outputting the alarm prompt information, the method further includes:

[0029] In response to a water cooling instruction, restarting the water pump;

[0030] Return to the step of measuring the temperature inside the electric pressure cooker by the top temperature sensor and determining the cooling rate based on the measurement result.

[0031] In one embodiment, determining the cooling rate based on the measurement result includes:

[0032] The cooling speed is determined according to a first measurement result at a first designated time, a second measurement result at a second designated time, and a time difference between the first designated time and the second designated time.

[0033] The present application solution can determine the cooling speed after the water cooling system is started by using the top temperature sensor that already exists in the electric pressure cooker, and then determine the amount of water in the water tank by using the cooling speed. This process does not require the use of additional components such as magnetic parts or reed switches, which reduces the complexity of the structure, and accordingly reduces the risk of failure, and has a low implementation cost.

[0034] In the present application, during the operation of the water cooling system, the gas temperature in the cooking cavity can be measured by the top temperature sensor. The temperature is related to the air pressure in the cooking cavity. The higher the temperature, the higher the air pressure. When the temperature is lower than the temperature threshold, it can be determined that the water cooling system has achieved good cooling and pressure reduction effects, and the water cooling system can be stopped in time to ensure that users have a good user experience.

[0035] In addition, the position state of the float valve can be used to determine whether the cooling is complete, thereby accurately determining the shutdown time point of the water cooling system.

[0036] In order to solve the problem that when there is not much water in the water tank, the water cooling system cools down slowly when it is running, and may run for too long, causing the user to keep waiting and resulting in a bad user experience, the target waiting time limit can be used as a backup measure. When the temperature and pressure reduction inside the cooking chamber are not completed, the water cooling system is controlled to run for the time allowed by the user and then shut down. This avoids the water cooling system from running continuously and causing the user to wait for too long, thereby achieving a good user experience.

[0037] In addition, when the cooling speed does not reach the water volume cooling speed threshold, it can be determined that there is no water in the water tank. At this time, an alarm prompt message can be output to promptly prompt the user to add water to the water tank, avoiding unnecessary waiting for the user, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solution of the embodiments of the present application, the drawings required for use in the embodiments of the present application are briefly introduced below.

[0039] Figure 1 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application;

[0040] Figure 2 A schematic flow chart of a control method for a water cooling system of an electric pressure cooker provided in one embodiment of the present application;

[0041] Figure 3A schematic diagram of the structure of an electric pressure cooker provided in one embodiment of the present application;

[0042] Figure 4 A block diagram of a control device for a water cooling system of an electric pressure cooker provided in one embodiment of the present application.

[0043] icon:

[0044] 31- water tank; 32- water pump; 33- top temperature sensor. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0046] Similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] like Figure 1 As shown, this embodiment provides an electronic device 1, including: at least one processor 11 and a memory 12, Figure 1 A processor 11 is taken as an example. The processor 11 and the memory 12 are connected via a bus 10. The memory 12 stores instructions that can be executed by the processor 11. The instructions are executed by the processor 11 so that the electronic device 1 can execute all or part of the process of the method in the following embodiment. In one embodiment, the electronic device 1 can be a controller of an electric pressure cooker, which is used to execute the control method of the water cooling system of the electric pressure cooker.

[0048] The memory 12 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable red-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, disk or optical disk.

[0049] The present application also provides a computer-readable storage medium, which stores a computer program. The computer program can be executed by the processor 11 to complete the control method of the electric pressure cooker water cooling system provided in the present application.

[0050] See also Figure 2 , is a flow chart of a control method of a water cooling system for an electric pressure cooker provided in an embodiment of the present application, such as Figure 2 As shown, the method may include the following steps 210 to 230.

[0051] Step 210: After the electric pressure cooker finishes cooking, in response to the water cooling and pressure reduction control signal, the water pump is started.

[0052] The solution is applied to an electric pressure cooker, which includes a water cooling system and a top temperature sensor. The water cooling system includes a water tank and a water pump, which are used to cool the inside of the electric pressure cooker with water; the top temperature sensor is used to detect the internal temperature of the electric pressure cooker.

[0053] See also Figure 3 , is a schematic diagram of the structure of an electric pressure cooker provided in an embodiment of the present application, such as Figure 3 As shown, a water pump 32 is provided at the bottom of the electric pressure cooker, and a water tank 31 is provided on the side wall. The water pump 32 and the water tank 31 constitute a water cooling system. A top temperature sensor 33 is provided under the upper cover of the electric pressure cooker. When the cover is closed, the top temperature sensor 33 can measure the temperature of the air in the cooking cavity of the electric pressure cooker. The higher the measured temperature, the higher the air pressure inside the electric pressure cooker; conversely, the lower the measured temperature, the lower the air pressure inside the electric pressure cooker.

[0054] After the electric pressure cooker finishes cooking, a water cooling and pressure reduction signal can be automatically triggered to start the water pump, or the water cooling and pressure reduction signal can be triggered in response to the user operating the touch panel of the electric pressure cooker or through voice, remote control, etc., so as to start the water pump. After starting the water pump, if there is water in the water tank, the water cooling and temperature reduction process can be entered.

[0055] Step 220: Measure the temperature inside the electric pressure cooker through the top temperature sensor, and determine the cooling speed based on the measurement result.

[0056] The top temperature sensor can be used to measure the temperature inside the electric pressure cooker at multiple time points, and the cooling rate can be determined based on at least two temperatures measured and the time between different measurement time points.

[0057] Step 230: Determine the amount of water in the water tank according to the cooling rate.

[0058] When there is no water in the water tank, the water cooling system cannot actually start, and the cooling speed is the slowest. When there is water in the water tank but the amount of water is small, the water cooling system can start, and the water in the water tank will be recycled during operation. At this time, the heat dissipation is slow due to the small amount of water, so the cooling speed is slow. When there is water in the water tank and the amount of water is sufficient, the water cooling system can start, and the sufficient amount of water dissipates heat quickly, so the cooling speed is the fastest.

[0059] After the cooling speed is obtained, the amount of water in the water tank can be determined according to the speed of the cooling speed.

[0060] Through the above measures, the temperature sensor on the top of the electric pressure cooker can be used to determine the cooling speed after the water cooling system is started, and then the amount of water in the water tank can be determined based on the cooling speed. This process does not require additional components such as magnetic parts or reed switches, which reduces the complexity of the structure and, accordingly, the risk of failure, and has a low implementation cost.

[0061] In one embodiment, after executing step 230, if the amount of water in the water tank is not zero, the temperature measured by the top temperature sensor can be obtained during the operation of the water cooling system. Here, the temperature can be obtained in real time or periodically. The cycle length can be configured as needed, such as: 1 second, 3 seconds, 5 seconds, etc.

[0062] After obtaining the temperature measured by the top temperature sensor, it can be determined whether the temperature is less than a preset temperature threshold. The temperature threshold can be configured based on experience, and the temperature threshold is the temperature that needs to be cooled by the water cooling system. In one case, if the temperature is not less than the temperature threshold, the temperature measured by the top temperature sensor can continue to be obtained. In another case, if the temperature is less than the temperature threshold, the water pump can be turned off.

[0063] Through this measure, it is possible to determine whether to stop the operation of the water cooling system based on the current cooling results, ensuring that the water cooling system achieves good cooling and pressure reduction effects after executing the water cooling process. During the water cooling process, the easily measurable temperature is used to actively determine whether the water pump can be turned off, and the time to turn off the water pump is objectively determined, thereby minimizing the user's waiting time and improving the user experience.

[0064] In one embodiment, after executing step 230, if the amount of water in the water tank is not zero, during the operation of the water cooling system, it can be determined whether the float valve of the electric pressure cooker is in a descending state. The float valve of the electric pressure cooker can be in a descending state (at this time, the outside atmosphere is connected to the cooking chamber, and the cooking chamber is at normal pressure) and a floating state (when the amount of steam generated by the cooking chamber is greater than a certain value, the buoyancy generated during the discharge process of the float valve causes the float valve to float. At this time, the cooking chamber is not connected to the atmosphere, and heating continues, and the cooking chamber will be pressurized). During the cooling process in the cooking chamber, the air pressure is also reduced accordingly. If the pressure is released, the float valve will fall under the action of gravity and return to the descending state. By setting a sensor for detecting the position of the float valve, the position state of the float valve can be detected in a timely and effective manner.

[0065] On the one hand, if the float valve is in an upward state, it means that the air pressure and temperature in the cooking chamber are still high and need to be cooled down. On the other hand, if the float valve is in a downward state, it means that the air pressure and temperature in the cooking chamber have dropped. At this time, the water pump can be turned off to stop the operation of the water cooling system.

[0066] Through this measure, the position state of the float valve can be used to accurately determine whether the temperature reduction in the cooking cavity is complete, thereby accurately determining the shutdown time point of the water cooling system. The scheme of determining whether the temperature reduction is complete by the position state of the float valve can be operated independently, or it can be operated together with the scheme of detecting the temperature by the top temperature sensor to determine whether the temperature reduction is complete. When the two schemes exist at the same time, when it can be determined in any one of the schemes that the air pressure and temperature in the cooking cavity drop, the water pump can be turned off, thereby ensuring that the water cooling system stops running in time after the temperature and air pressure in the cooking cavity drop.

[0067] In one embodiment, after executing step 230, if the amount of water in the water tank is not zero, the water cooling system can be operated. However, when the amount of water in the water tank is not large, the cooling speed of the water cooling system is slow during operation, and it may run for too long, causing the user to wait continuously and resulting in a poor user experience. To solve this problem, based on the solution of detecting the temperature through the top temperature sensor to determine whether the cooling is completed, or based on the combination of the solution of detecting the temperature through the top temperature sensor to determine whether the cooling is completed and the solution of determining whether the cooling is completed by the position state of the float valve, the operation time of the water pump can be limited by the target waiting time.

[0068] After starting the water pump, the running time of the water pump can be timed, and it can be determined in real time whether the running time reaches the target waiting time. Here, the target waiting time can be an empirical value, which represents the maximum water cooling time that the user can tolerate while waiting for the water to cool down when using the electric pressure cooker. On the one hand, if the running time of the water pump does not reach the target waiting time, it can continue to run until the running time of the water pump reaches the target waiting time, or until it is determined that the water pump can be shut down according to other solutions. On the other hand, if the running time of the water pump reaches the target waiting time, the water pump can be turned off.

[0069] Through this measure, the water pump can be controlled to stop running according to the running time of the water pump, and the limit condition of the target waiting time is used as a backup measure. When the temperature and pressure reduction inside the cooking chamber are not completed, the water cooling system is controlled to run for the time allowed by the user and then shut down. This avoids the water cooling system from running continuously and causing the user to wait for too long, thereby achieving a good user experience.

[0070] In one embodiment, when there is not much water in the water tank, the water is more likely to heat up after absorbing heat, thereby reaching a high temperature state faster. Therefore, the higher the water temperature in the water tank, the less effective the heat absorption effect during cooling, which further affects the pressure reduction (cooling) speed. Considering that relying solely on a water cooling system to reduce pressure may not be ideal, it may cause users to wait too long, resulting in a bad user experience. Alternatively, because the pressure reduction speed is too slow, the pressure in the cooking cavity cannot be reduced to a safe value, and there is residual pressure. To solve the above problems, a pressure limiting valve can be used for combined pressure relief. Here, the pressure limiting valve can release the gas in the cooking cavity when it is open, thereby reducing the air pressure in the cooking cavity.

[0071] In the scheme of comparing the temperature measured by the top temperature sensor with the temperature threshold to determine whether to turn off the water pump, or in the scheme of determining whether to turn off the water pump by detecting the position state of the float valve, it can be determined whether the running time of the water pump reaches the preset waiting time threshold. The waiting time threshold can be configured as needed. When there is a large amount of water in the water tank, when the running time of the water pump reaches the waiting time threshold, the pressure in the cooking chamber can be reduced.

[0072] On the one hand, if the running time does not reach the waiting time threshold, no processing is required. On the other hand, if the running time reaches the waiting time threshold, it means that the pressure reduction effect of the water cooling system is not ideal. At this time, the pressure limiting valve of the electric pressure cooker can be opened, and the pressure limiting valve can be combined with the pressure limiting valve for joint pressure relief to accelerate the pressure reduction process of the cooking chamber.

[0073] Through the above measures, it is possible to determine whether the pressure reduction effect of the water cooling system is ideal based on the running time of the water pump, so that in the case of unsatisfactory pressure reduction, the pressure limiting valve can be combined to release the pressure and accelerate the pressure reduction process of the cooking chamber. In this case, when the pressure reduction effect of the water cooling system is not good, the pressure reduction speed can be increased, the user's waiting time can be reduced, and the user experience can be improved.

[0074] In one embodiment, after obtaining the cooling speed, it can be determined whether the cooling speed is less than a first speed threshold. Here, the first speed threshold can be configured as needed, and the first speed threshold represents the cooling speed that the water cooling system should achieve when there is enough water in the water tank.

[0075] In one case, if the cooling speed is not less than the first speed threshold, no processing is performed. In another case, if the cooling speed is less than the first speed threshold, it means that the cooling speed is slow, and accordingly, the pressure reduction effect is not ideal. At this time, after the water pump ends its operation, the pressure limiting valve of the electric pressure cooker can be opened to release the pressure through the pressure limiting valve to avoid residual pressure in the cooking area.

[0076] In one embodiment, when executing step 230, it can be determined whether the cooling speed reaches the water cooling speed threshold. The water cooling speed threshold is the minimum cooling speed that can be achieved by the water cooling system when there is water in the water tank. The water cooling speed threshold can be configured based on experience. For example, the water cooling speed threshold is 2°C / min.

[0077] In one case, if the cooling speed reaches the water cooling speed threshold, it can be said that there is water in the water tank, and the water cooling process is being executed. In another case, if the cooling speed does not reach the water cooling speed threshold, it can be said that the water cooling system is not working, that is, there is no water in the water tank. In this case, an alarm prompt message can be output, and the alarm prompt message indicates that there is no water in the water tank. The alarm prompt message can be output through the display panel or audio device carried by the electric pressure cooker itself, or through a user terminal (such as a mobile phone, tablet computer, host, etc.) connected to the electric pressure cooker. The alarm prompt message can be voice, text, multimedia, etc.

[0078] Through this measure, it is possible to accurately determine whether there is water in the water tank based on the water cooling speed threshold, and promptly remind the user to add water when there is no water. In this case, the user can be reminded in time when there is no water in the water tank, and through effective interaction, the user can avoid unnecessary waiting, thereby improving the user experience.

[0079] In one embodiment, after the alarm prompt information is output, the user may directly trigger the pressure limiting valve opening instruction by touching the panel or by voice, remote control, etc. After receiving the pressure limiting valve opening instruction, it can be determined that the pressure needs to be released by opening the pressure limiting valve, and at this time, the pressure limiting valve is opened.

[0080] Through this measure, when there is no water in the water tank, the temperature and pressure can be lowered by opening the pressure limiting valve, thereby increasing the speed of cooling and reducing the pressure in the cooking cavity, reducing the user's waiting time, and improving the user experience.

[0081] In one embodiment, after the alarm prompt information is output, the user can add water to the water tank and trigger the water cooling instruction by touching the panel or by voice, remote control, etc. After receiving the water cooling instruction, the water pump can be restarted in response to the water cooling instruction, and the process returns to step 220.

[0082] Through this measure, after the user adds water and triggers the water cooling instruction, the water cooling system can be restarted for water cooling. In addition, after starting the water cooling, the process returns to step 220, and further subsequent processing can be performed according to the water volume in the water tank.

[0083] In one embodiment, when determining the cooling speed based on the measurement results, the cooling speed can be determined according to a first measurement result at a first specified time, a second measurement result at a second specified time, and a time difference between the first specified time and the second specified time.

[0084] Here, the first designated time and the second designated time can be configured as needed. Exemplarily, the first designated time is the 5th minute after the water pump is turned on, and the second designated time is the 10th minute after the water pump is turned on.

[0085] The cooling rate can be obtained by subtracting the second measurement result from the first measurement result and dividing the temperature difference by the above time difference.

[0086] Figure 4 is a block diagram of a control device for a water cooling system of an electric pressure cooker according to an embodiment of the present invention. Figure 4 As shown, the device may include:

[0087] A starting module 410 is used to start the water pump in response to a water cooling pressure reduction control signal after the cooking of the electric pressure cooker is finished;

[0088] A measuring module 420, configured to measure the temperature inside the electric pressure cooker through the top temperature sensor, and determine a cooling rate based on the measurement result;

[0089] The determination module 430 is used to determine the amount of water in the water tank according to the cooling speed.

[0090] The implementation process of the functions and effects of each module in the above-mentioned device is specifically described in the implementation process of the corresponding steps in the above-mentioned control method of the water cooling system of the electric pressure cooker, and will not be repeated here.

[0091] In several embodiments provided in the present application, the disclosed devices and methods may also be implemented in other ways. The device embodiments described above are merely schematic, for example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram may represent a module, a program segment or a part of a code, and a module, a program segment or a part of a code contains one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the box may also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they may sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flowchart, and the combination of boxes in the block diagram and / or the flowchart, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0093] If the function is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

Claims

1. A control method for a water cooling system of an electric pressure cooker, applied to an electric pressure cooker, wherein the electric pressure cooker comprises a water cooling system and a top temperature sensor, wherein the water cooling system comprises a water tank and a water pump, and wherein: include: After the cooking of the electric pressure cooker is finished, in response to a water cooling pressure reduction control signal, the water pump is started; Measuring the temperature inside the electric pressure cooker by the top temperature sensor, and determining the cooling speed based on the measurement result; The amount of water in the water tank is determined according to the cooling speed.

2. The method according to claim 1, characterized in that After determining the amount of water in the water tank according to the cooling speed, the method further includes: If the amount of water in the water tank is not zero, determining whether the temperature measured by the top temperature sensor is less than a preset temperature threshold; If so, turn off the water pump.

3. The method according to claim 1, characterized in that: After determining the amount of water in the water tank according to the cooling speed, the method further includes: If the amount of water in the water tank is not zero, determining whether the float valve of the electric pressure cooker is in a descending state; If so, turn off the water pump.

4. The method according to any one of claims 1 to 3, characterized in that: After determining the amount of water in the water tank according to the cooling speed, the method further includes: If the amount of water in the water tank is not zero, the water pump is turned off when the running time of the water pump reaches the target waiting time.

5. The method according to any one of claims 2 to 3, characterized in that: The method further comprises: Determine whether the running time of the water pump reaches a preset waiting time threshold; If so, open the pressure limiting valve of the electric pressure cooker.

6. The method according to any one of claims 1 to 3, characterized in that: The method further comprises: Determining whether the cooling speed is less than a first speed threshold; If so, when the water pump ends its operation, the pressure limiting valve of the electric pressure cooker is opened.

7. The method according to claim 1, characterized in that The step of determining the amount of water in the water tank according to the cooling speed includes: Determining whether the cooling speed reaches a water cooling speed threshold; If it is not reached, an alarm prompt message is output, and the alarm prompt message indicates that there is no water in the water tank.

8. The method according to claim 7, characterized in that After outputting the alarm prompt information, the method further includes: In response to the pressure-limiting valve opening instruction, the pressure-limiting valve is opened.

9. The method according to claim 7, characterized in that: After outputting the alarm prompt information, the method further includes: In response to a water cooling instruction, restarting the water pump; Return to the step of measuring the temperature inside the electric pressure cooker by the top temperature sensor and determining the cooling rate based on the measurement result.

10. The method according to claim 1, characterized in that The step of determining the cooling rate based on the measurement result comprises: The cooling speed is determined according to a first measurement result at a first designated time, a second measurement result at a second designated time, and a time difference between the first designated time and the second designated time.

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