Refrigerator and control method of refrigerator

Abstract

The invention discloses a refrigerator and a control method of the refrigerator, and relates to the technical field of refrigerators, the refrigerator comprises an inverter compressor configured to adjust the operation rotating speed of the inverter compressor in response to a control instruction of a controller; the controller is configured to generate an update flag bit when the first time length is greater than the first preset time length if the update flag bit of the optimal rotating speed is not detected during startup operation aiming at any startup period when the inverter compressor is not powered on for the first time; during startup operation, if the update flag bit is detected, and the first startup period and the second startup period are adjacent startup periods, the operation rotating speed is controlled according to the second operation duration of the inverter compressor; and during startup operation, if the update flag bit is detected and the first startup period and the second startup period are not adjacent startup periods, updating the optimal rotating speed according to the first startup rate, and deleting the update flag bit. By means of the refrigerator, the rotating speed adaptability and the long-term operation performance of the refrigerator can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, and in particular to a refrigerator and a control method of the refrigerator. BACKGROUND

[0002] In the current refrigerator field, mechanical variable frequency refrigerators without a ring temperature sensor greatly reduce production and manufacturing costs while ensuring the basic functions of variable frequency operation, and gradually become one of the mainstream options for mechanical temperature control type refrigeration products.

[0003] Currently, the refrigerator without a ring temperature sensor usually takes the start-up rate (the ratio of the running time of the variable frequency compressor in the last start-up period to the total time of the period) as the core basis for speed regulation. That is, the running speed of the variable frequency compressor is adjusted according to the start-up rate of the last start-up period. If the start-up rate is high, the running speed is gradually increased from a lower preset running speed to adapt to a large load, and if the start-up rate is low, the running speed is gradually reduced to achieve energy saving.

[0004] However, when facing a load mutation (such as frequent door opening and closing, adding storage of hot food), which requires strong cooling demand for cooling, gradually adjusting the speed from the fixed preset running speed will make the variable frequency compressor have a long speed update period and a lagging cooling response, and the energy is wasted due to invalid speed operation. SUMMARY

[0005] The present application provides a refrigerator and a control method of the refrigerator, which can solve the problem of poor speed adaptability and long-term operation performance of the refrigerator without a ring temperature sensor.

[0006] In a first aspect, a refrigerator is provided, comprising: a variable frequency compressor configured to adjust the running speed of the variable frequency compressor in response to a control instruction of a controller; the controller is configured to: for any start-up period of the variable frequency compressor other than the first power-on, when the variable frequency compressor is running, if an update flag of the optimal speed is not detected, the first time duration of the variable frequency compressor running at the optimal speed is counted; the start-up period includes the running time and standby time of the variable frequency compressor; the update flag is used to indicate that the controller updates the optimal speed in the next start-up period; if the first time duration is greater than a first preset time duration, the update flag is generated; adjusting the optimal speed of the variable frequency compressor to the highest speed to run until the refrigerator meets the preset gear stop requirement and enters the standby state; If the update flag of the preferred rotating speed is detected and the first start-up period and the second start-up period in which the update flag is generated are adjacent start-up periods, the variable frequency compressor is controlled to operate at the preferred rotating speed when the variable frequency compressor is started to operate. The second running duration of the variable frequency compressor is counted when the variable frequency compressor is started to operate. The running rotating speed of the variable frequency compressor is controlled according to the second running duration until the refrigerator meets the gear stop requirement and enters the standby state. If the update flag of the preferred rotating speed is detected and the first start-up period and the second start-up period are not adjacent start-up periods, the variable frequency compressor is controlled to operate at the preferred rotating speed when the variable frequency compressor is started to operate. The first start-up probability of the third start-up period is obtained; the third start-up period is the last start-up period of the first start-up period. The running rotating speed of the variable frequency compressor is controlled according to the first start-up probability, and the preferred rotating speed is updated and the update flag is deleted when a new preferred rotating speed is obtained.

[0007] In the above technical solution, for any start-up period of the variable frequency compressor that is not the first power-on, since the update flag is used to indicate that the controller updates the preferred speed in the next start-up period, if the update flag of the preferred speed is not detected, it indicates that the variable frequency compressor can meet the refrigeration demand when running at the preferred speed in the last start-up period, and thus there is no need to update the preferred speed in the current start-up period. Alternatively, the controller updates the preferred speed again in the last start-up period, and at this time there is also no need to update the preferred speed. Based on this, the controller can control the variable frequency compressor to run at the preferred speed and count the first duration of running. The start-up period includes the start-up running time and standby time of the variable frequency compressor. Then, when the first duration is greater than the first preset duration, it can be considered that the refrigerator has a load mutation (such as frequent door opening and closing, addition of stored hot food), which causes the refrigeration demand to increase, and running at the preferred speed for the first preset duration will still not meet the refrigeration demand. Based on this, it can be considered that the preferred speed does not meet the requirements, and thus the above update flag can be generated to regenerate the preferred speed that matches the load mutation. In order to quickly meet the refrigeration demand, the preferred speed of the variable frequency compressor can be adjusted to the highest speed at the same time, and the refrigerator enters the standby state after meeting the preset gear stop requirement. When the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up period and the second start-up period in which the update flag is generated are adjacent start-up periods, it indicates that the controller considers that the preferred speed does not match the load mutation scenario in the last start-up period (the second start-up period). At this time, since the update of the preferred speed needs to be adjusted based on the accurate start-up rate, the controller can control the variable frequency compressor to run at the preferred speed and count the second running duration of the variable frequency compressor, and control the running speed of the variable frequency compressor according to the second running duration, until the refrigerator meets the gear stop requirement and enters the standby state, providing a reference start-up rate for quickly adjusting a new energy-saving running speed (new preferred speed). When the variable frequency compressor is running, if the update flag of the preferred speed is detected, it can be considered that the controller needs to update the preferred speed. And since the first start-up period and the second start-up period are not adjacent start-up periods, and the third start-up period is the last start-up period of the first start-up period, and the first start-up rate is the ratio of the second duration of the variable frequency compressor running in the third start-up period to the total duration of the period, the first start-up rate of the third start-up period can be obtained as the reference start-up rate of the preferred speed. Finally, when the new preferred speed is not obtained, the controller can first control the variable frequency compressor to run at the original preferred speed, control the running speed of the variable frequency compressor based on the first start-up rate, and update the original preferred speed when a new preferred speed is obtained during the running of the variable frequency compressor, and delete the update flag.Furthermore, the controller directly operates and adjusts based on the preferred speed to obtain a new preferred speed. This eliminates the need to start from a high speed (in related technologies, when the operating time is long, the inverter compressor speed will increase to a high speed to meet cooling demand), thus shortening the speed update cycle. Moreover, by obtaining the new preferred speed and deleting the update flag, the scenario where the preferred speed was not detected can be re-executed in subsequent operating cycles. Therefore, through the aforementioned layered operating rate adaptation adjustment and operating cycle adaptation control logic, the speed adaptability and long-term operating performance of the sensorless refrigerator can be comprehensively improved.

[0008] Secondly, a control method for a refrigerator is provided, applied to the refrigerator of the first aspect. The refrigerator includes an inverter compressor, which adjusts its operating speed in response to control commands from a controller. The control method for the refrigerator includes: For any startup cycle of the variable frequency compressor that is not powered on for the first time, if the update flag of the preferred speed is not detected when the variable frequency compressor is running, the first duration of the variable frequency compressor running at the preferred speed is counted; the startup cycle includes the startup running time and standby time of the variable frequency compressor; the update flag is used to instruct the controller to update the preferred speed in the next startup cycle; If the first duration is longer than the first preset duration, an update flag is generated; Adjust the inverter compressor to its optimal speed and run it at the highest speed until the refrigerator meets the preset shutdown requirements and then enters standby mode; When the variable frequency compressor is started up, if the update flag of the preferred speed is detected, and the first start-up cycle and the second start-up cycle that generated the update flag are adjacent start-up cycles, then the variable frequency compressor is controlled to run at the preferred speed; the first start-up cycle is the start-up cycle in which the variable frequency compressor is currently running. The second running time of the variable frequency compressor after startup is recorded. The operating speed of the inverter compressor is controlled according to the second running time until the refrigerator meets the requirements for stopping at the set position and then enters the standby state. If the preferred speed update flag is detected when the variable frequency compressor is started up, and the first start-up cycle and the second start-up cycle are not adjacent start-up cycles, then the variable frequency compressor is controlled to run at the preferred speed. Obtain the first boot rate of the third boot cycle; the third boot cycle is the previous boot cycle of the first boot cycle; The operating speed of the variable frequency compressor is controlled according to the first start-up rate, and when a new preferred speed is obtained, the preferred speed is updated and the update flag is deleted.

[0009] Thirdly, a computer-readable storage medium is provided, which stores a computer program that, when run by a refrigerator, causes the refrigerator to perform the refrigerator control method of the second aspect.

[0010] Fourthly, a computer program product is provided, comprising: a computer program that, when run by a refrigerator, causes the refrigerator to execute the refrigerator control method of the second aspect.

[0011] It is understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0012] Figure 1 This is a timing interaction diagram of a refrigerator control method in a refrigerator according to an embodiment of this application; Figure 2 This is a schematic diagram illustrating an application scenario in which the speed of a variable frequency compressor is adjusted during any startup cycle other than the initial power-on in a related technology. Figure 3 This is a schematic diagram illustrating an application scenario of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in one embodiment of this application; Figure 4 This is a schematic diagram illustrating one implementation method of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in one embodiment of this application; Figure 5 This is a schematic diagram illustrating one implementation of a refrigerator control method for determining a new preferred rotation speed in one embodiment of this application; Figure 6 This is a schematic diagram illustrating one implementation method of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in another embodiment of this application; Figure 7 This is a schematic diagram illustrating one implementation method of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in another embodiment of this application; Figure 8 This is a schematic diagram illustrating one implementation of updating the optimal rotation speed in a refrigerator control method provided in this application embodiment; Figure 9 This is a schematic diagram illustrating an application scenario of adjusting the speed of a variable frequency compressor during initial power-on in related technologies; Figure 10 This is a schematic diagram illustrating an implementation method for adjusting the speed of the variable frequency compressor during the initial power-on operation of a refrigerator control method provided in one embodiment of this application; Figure 11 This is a schematic diagram illustrating an application scenario of adjusting the speed of the variable frequency compressor during the initial power-on operation of a refrigerator control method provided in one embodiment of this application. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B; "and / or" in this text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0014] Hereinafter, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0015] Specific details, such as particular system architectures and techniques, are set forth for illustrative purposes and not for limitation, to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted to avoid unnecessary detail that could obscure the description of this application.

[0016] In the current refrigerator industry, mechanical inverter refrigerators without ambient temperature sensors have become one of the mainstream choices for mechanical temperature control refrigeration products because they eliminate the need for temperature sensors, corresponding wiring harnesses, and complex control modules, while ensuring the basic functions of inverter operation and significantly reducing production and manufacturing costs.

[0017] Currently, refrigerators without ambient temperature sensors typically use the operating rate (the ratio of the inverter compressor's running time in the previous operating cycle to the total cycle time) as the core basis for speed adjustment. That is, the operating speed of the inverter compressor is adjusted according to the operating rate of the previous operating cycle. If the operating rate is high, the operating speed is gradually increased from a lower preset speed to adapt to the large load; if the operating rate is low, the operating speed is gradually decreased to achieve energy saving.

[0018] However, when faced with sudden load changes (such as frequent door opening and closing, or the addition of stored hot food) that require strong cooling, gradually increasing or decreasing the speed from a fixed preset operating speed will result in a long speed update cycle for the variable frequency compressor, a delayed cooling response, and energy waste due to ineffective speed operation.

[0019] Therefore, in order to improve the speed adaptability and long-term operating performance of sensorless refrigerators, please refer to [link / reference needed]. Figure 1 , Figure 1This is a timing interaction diagram of a refrigerator control method in a refrigerator according to an embodiment of this application, as shown below. Figure 1 As shown, the variable frequency compressor is configured to: adjust the operating speed of the variable frequency compressor in response to control commands from the controller; the controller is configured to perform the following steps: S101. For any startup cycle of the variable frequency compressor that is not powered on for the first time, if the update flag of the preferred speed is not detected when the variable frequency compressor is running, the first duration of the variable frequency compressor running at the preferred speed is counted.

[0020] The start-up cycle includes the start-up time and standby time of the variable frequency compressor. The update flag is used to instruct the controller to update the preferred speed in the next start-up cycle.

[0021] In one embodiment, the aforementioned first power-on refers to the initial operating state when the refrigerator is powered on for the first time after the entire unit has been powered off. At this time, the control board completes system initialization, and the inverter compressor starts from a completely stopped state, which is distinct from non-first power-on (when the inverter compressor runs after being in standby mode). The non-first power-on defined in this step focuses on the control logic of the inverter compressor's normal start-up operation and standby cycle.

[0022] The aforementioned start-up cycle refers to the complete operating cycle of the inverter compressor from the start of operation to the next start-up. It is the basic control unit of the refrigerator refrigeration system and includes two continuous stages: the inverter compressor start-up operation stage and the inverter compressor standby stage. The duration of a complete start-up cycle is the sum of the start-up operation time and the standby time.

[0023] The above-mentioned preferred speed is the optimal variable frequency compressor speed for the current operating conditions, determined by the refrigerator through dynamic iterative adaptation and stable operation verification. It is not a fixed preset speed, but a dynamic speed that takes into account both cooling effect and energy saving target, and can be iteratively updated according to load changes (such as opening and closing the door, adding food).

[0024] The aforementioned update flag is an internal identifier signal of the controller, used to indicate whether the preferred speed needs to be updated in the next startup cycle. Generating this update flag indicates that the current preferred speed cannot meet the cooling demand after a sudden change in load, and readjustment is required. Deleting this flag indicates that the preferred speed has been updated, and the new preferred speed can be used directly in the next startup cycle.

[0025] The update flag can be a number (e.g., 0 or 1) or a letter, without restriction.

[0026] The aforementioned first duration refers to the cumulative time the controller has recorded during which the inverter compressor has continuously operated at the current preferred speed in scenarios where no update flag is detected. This duration can be used to determine whether cooling demand has increased or whether the load has changed abruptly. Specifically, the first duration directly determines whether the preferred speed update process is triggered.

[0027] The start-up time is the actual cooling time of the inverter compressor within one operating cycle after it starts, until the refrigerator reaches the shutdown condition of the set temperature control level and the inverter compressor stops running. The standby time is the time the entire unit enters standby mode after the inverter compressor stops running, until the internal temperature of the refrigerator rises back to meet the start-up conditions of the inverter compressor, at which point the inverter compressor starts again; during this stage, there is no cooling operation.

[0028] It should be noted that for any startup cycle of the inverter compressor that is not the first power-on, the controller first checks for an update flag. If no update flag is detected, it indicates that the optimal speed of the previous startup cycle is sufficient to meet the cooling requirements, and no immediate update is needed. Therefore, the inverter compressor can be controlled to continue operating at this optimal speed, and the first operating time can be statistically analyzed to detect whether the refrigerator experiences a sudden load change (such as frequent door opening and closing, or the addition of hot food). This triggers the subsequent update flag process, ensuring stable and energy-efficient operation under normal conditions while also responding quickly to sudden load changes and avoiding lag in cooling response.

[0029] S102. If the first duration is greater than the first preset duration, then an update flag is generated.

[0030] In one embodiment, the first preset duration can be set according to actual conditions and is not limited thereto. For example, the first preset duration can be 60 minutes.

[0031] Understandably, if the first duration exceeds the first preset duration, it indicates that the refrigerator is currently experiencing a sudden load change, with a significant increase in cooling demand, and the current optimal speed is no longer sufficient to meet the cooling requirements. At this point, the controller generates an update flag to mark the current optimal speed as invalid, instructing the controller to readjust and update the optimal speed in the next startup cycle, providing a trigger basis for the subsequent speed adjustment process to adapt to the new load.

[0032] It should be noted that when the first duration is less than or equal to the first preset duration, it can be assumed that the refrigerator has not experienced a sudden load change during the current startup cycle, and the preferred rotation speed can meet the cooling requirements. Therefore, there is no need to generate an update flag. In this case, the above S101 step will still be executed in the next startup cycle.

[0033] S103. Adjust the inverter compressor to the optimal speed and run it at the highest speed until the refrigerator meets the preset shutdown requirements and then enters standby mode.

[0034] In one embodiment, the maximum speed refers to the maximum operating speed allowed by the hardware design of the inverter compressor, which is the upper limit of the inverter compressor's cooling capacity. At the maximum speed, the inverter compressor's cooling efficiency and cooling capacity both reach their peak, enabling it to reduce the temperature inside the refrigerator as quickly as possible. This is the ultimate speed for coping with sudden load changes (such as frequent door opening and closing, or the addition of hot food) that force cooling demand.

[0035] The shutdown requirement can be the shutdown temperature condition corresponding to the temperature control setting set in advance on the refrigerator, or the corresponding running time condition (when the running time is equal to the preset running time, the shutdown requirement is met; different temperature control settings correspond to different preset running times), and there are no restrictions on this.

[0036] For example, different settings correspond to different target shutdown temperatures (such as the refrigerator setting corresponding to 4℃ shutdown and the freezer setting corresponding to -18℃ shutdown). When the temperature inside the refrigerator drops to the target temperature set for that setting, the shutdown requirement for that setting is met.

[0037] The aforementioned standby state refers to the state where the inverter compressor stops running and the whole machine enters a low-power waiting state. At this time, the inverter compressor does not perform any cooling action. Only the refrigerator temperature control system monitors the temperature inside the refrigerator in real time. When the temperature rises back to the inverter compressor's start-up threshold, the inverter compressor will start running again. This is the normal pause phase of the refrigerator's cooling cycle.

[0038] It should be noted that if the current optimal speed is determined to be insufficient to meet the enhanced cooling demand, the controller directly adjusts the inverter compressor speed to the maximum speed. This utilizes the peak cooling capacity of the maximum speed to rapidly lower the temperature until the refrigerator's internal temperature reaches the stop temperature corresponding to the user-set setting. Once the stop temperature requirement is met, the inverter compressor stops running and enters standby mode. This not only quickly resolves the cooling lag issue after sudden load changes but also ensures timely shutdown and standby after achieving the cooling target, avoiding unnecessary high-speed energy waste.

[0039] In another embodiment, reference is made to Figure 2 , Figure 2 This is a schematic diagram illustrating an application scenario in related technologies where the speed of a variable frequency compressor is adjusted during any startup cycle, not the initial power-on. Figure 2The horizontal axis represents the test time (minutes), recording the entire cycle of the refrigerator from stable operation and sudden load change to speed adjustment. The left side of the vertical axis represents the internal temperature (°C), visually reflecting the temperature fluctuations inside the refrigerator, while the right side represents the inverter compressor power (W). Since power is positively correlated with the inverter compressor speed, it indirectly reflects the operating speed of the inverter compressor. Among them, the curve marked by number 1 is the power curve, indirectly reflecting the increase and decrease of speed; the curve marked by number 2 is the internal temperature of the refrigerator, visually presenting the temperature fluctuations and cooling process after a sudden load change; the dot corresponding to number 3 is the moment of sudden load change simulating the addition of hot food, at which point the internal temperature rises sharply, triggering forced cooling demand.

[0040] When a refrigerator experiences a sudden load change, the relevant technology detects the forced cooling demand and typically employs a control logic that gradually increases the frequency in small increments. Only after multiple small frequency increases fail to reach the required shutdown temperature does the inverter compressor speed (curve 1) increase to its maximum speed to output maximum cooling capacity. Once the internal temperature of the refrigerator (curve 2) drops to the shutdown temperature, the frequency is gradually reduced from the maximum speed to a low-speed, energy-efficient, and stable state adapted to the new operating conditions.

[0041] However, the above control methods have several drawbacks: First, the forced cooling response is delayed, and the step-by-step frequency increase prevents the inverter compressor from quickly outputting a large cooling capacity, resulting in a large temperature rise and a long cooling cycle inside the unit, making it impossible to freeze food in a timely manner. Second, there is a significant waste of additional energy. During the process of step-by-step frequency reduction from the highest speed to the new energy-saving speed, a large number of ineffective speed operation phases prolong the adjustment cycle, leading to a substantial increase in the load power consumption (the increase in energy consumption related to user usage). Third, the speed regulation efficiency is low. The step-by-step adjustment logic, which relies on the runtime, has a long iteration cycle for the optimal speed under new loads, making it impossible to quickly lock in a stable speed suitable for the operating conditions, thus weakening the energy-saving advantages of the inverter compressor.

[0042] In this embodiment, directly adjusting the inverter compressor to its maximum speed achieves the refrigerator's rapid cooling requirement. Specifically, refer to... Figure 3 , Figure 3 This is a schematic diagram illustrating an application scenario of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in one embodiment of this application. Figure 3 The horizontal axis represents the test time (minutes), the left side of the vertical axis represents the internal temperature (°C), and the right side represents the inverter compressor operating speed (RPM). The curve marked with number 1 is a power curve indirectly reflecting the inverter compressor's operating speed, showing the process of the compressor's speed increase and decrease; the curve marked with number 2 is the internal temperature curve, reflecting the fluctuation and cooling trend of the refrigerator's internal temperature after a sudden load change; number 3 marks the moment of the sudden load change simulating the addition of hot food, which is the node triggering forced cooling demand and speed adjustment.

[0043] Based on the dot marked with the number 3, it can be seen that before the sudden load change, the inverter compressor is stably operating at a low speed for energy saving. This speed has accumulated stable operation and has been marked as the optimal speed. The temperature inside the chamber fluctuates smoothly, indicating a stable cooling phase with high efficiency and energy saving. After the load is applied, the controller quickly identifies the forced cooling demand, and the inverter compressor speed curve corresponding to number 1 directly increases to a higher speed, outputting a large cooling capacity. This drives the temperature inside the chamber corresponding to the curve of number 2 to drop rapidly, completing rapid cooling and then entering standby mode. Thus, it not only meets the user's need for rapid cooling but also avoids the extra energy consumption caused by ineffective adjustments, achieving a dual improvement in cooling response speed and energy saving effect.

[0044] S104. When the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up cycle and the second start-up cycle that generates the update flag are adjacent start-up cycles, then the variable frequency compressor is controlled to run at the preferred speed.

[0045] The first start-up cycle is the current start-up cycle of the variable frequency compressor.

[0046] In one embodiment, the first start-up cycle refers to the cycle in which the variable frequency compressor is currently starting up. It is a complete control loop that the controller is processing, which includes the start-up time of the variable frequency compressor and the subsequent standby time, i.e., the current start-up cycle.

[0047] Conversely, the second startup cycle refers to the startup cycle preceding the one that generates the update flag, which is the cycle immediately preceding the first startup cycle. During the second startup cycle, the controller determines that the original preferred speed cannot meet the cooling demand, and thus generates an update flag to indicate that the preferred speed needs to be updated in the next cycle (i.e., the current first startup cycle).

[0048] Understandably, when the controller detects an update flag in the current first startup cycle, and this update flag was generated in the adjacent second startup cycle, it can be assumed that the second startup cycle has determined that the original preferred speed does not match the forced cooling demand. However, accurate updates to the preferred speed rely on accurate operating data (such as the operating rate). Therefore, the controller can first control the inverter compressor to operate at the original preferred speed. On the one hand, this maintains the basic cooling capacity and prevents the internal temperature from running out of control. On the other hand, it records the inverter compressor's operating time in this cycle (the second operating time), providing data support for subsequent adjustments to the new preferred speed based on the operating rate. This ensures the accuracy of subsequent speed updates and avoids blind adjustments.

[0049] S105, the second running time of the variable frequency compressor after startup.

[0050] S106. Control the operating speed of the inverter compressor according to the second running time until the refrigerator meets the shutdown requirements and enters the standby state.

[0051] In one embodiment, the second runtime refers to the cumulative time the inverter compressor actually runs within the current first start-up cycle, as counted by the controller. (Refer to...) Figure 3 A complete startup cycle consists of runtime and standby time: runtime corresponds to the peak period of curve 1 in the figure (e.g., the time from time a to time b), which is the time period when the inverter compressor starts up and outputs cooling capacity; standby time corresponds to the stable low period of the red curve (the smooth interval between peaks, e.g., the time from time b to time c), which is the time period when the refrigerator enters standby mode and the internal temperature slowly rises. The sum of the two durations is the total duration of a complete startup cycle.

[0052] It should be noted that during the first start-up cycle, while the inverter compressor runs at its original preferred speed, the controller continuously accumulates the second running time. This duration is used to determine whether the current operating speed can efficiently meet the cooling demand. Subsequently, based on the second running time, the controller can dynamically adjust the inverter compressor speed (if the duration is too long, the frequency is slightly increased to enhance cooling; if the duration is moderate, it is maintained or finely adjusted) to gradually reduce the internal temperature to the required shutdown level. After cooling is completed, the inverter compressor stops and enters standby mode. This process ensures the continuity of basic cooling after sudden load changes and lays the foundation for subsequent iterations of the new preferred speed based on the start-up rate using precise running time data, avoiding energy waste from ineffective speed adjustments and shortening the adaptation cycle of the new preferred speed.

[0053] S107. When the variable frequency compressor is running, if the update flag of the preferred speed is detected and the first start-up cycle and the second start-up cycle are not adjacent start-up cycles, the variable frequency compressor is controlled to run at the preferred speed.

[0054] In one embodiment, the above-mentioned non-adjacent startup cycles refer to the second startup cycle that generates the update flag bit (i.e., the historical cycle that triggers the preferred speed update), which is separated from the currently running first startup cycle by at least one complete startup cycle, and the two are not in a close successor cycle relationship.

[0055] For example, if the second power-on cycle is the Nth power-on cycle and the first power-on cycle is the N+2th cycle, with an N+1th cycle in between, then the two are not adjacent power-on cycles, which is different from adjacent power-on cycles (for example, the second power-on cycle is the Nth cycle and the first power-on cycle is the N+1th cycle, with no interval).

[0056] It should be noted that when the controller detects an update flag in the current first startup cycle, but this update flag comes from an earlier, non-adjacent second startup cycle, it indicates that the load change scenario triggered by the update flag (such as the addition of a hot load) has passed for at least one startup cycle, and new operating data has been generated in between. The old load demand corresponding to the original update flag may have changed. At this time, the controller first controls the inverter compressor to run at the original preferred speed to maintain basic cooling capacity and avoid the temperature inside the unit from getting out of control due to blindly adjusting the speed. Also, it collects the actual operating data of the current first startup cycle (such as running time and subsequent startup rate) based on the latest operating conditions rather than outdated old load scenarios, providing a basis for subsequent precise adjustment of the new preferred speed, ensuring that the speed update matches the current actual cooling demand, and avoiding ineffective adjustments and energy waste.

[0057] S108, Obtain the first boot rate of the third boot cycle.

[0058] The third startup cycle is the startup cycle preceding the first startup cycle. Specifically, the third startup cycle refers to the complete startup cycle preceding the currently running first startup cycle, that is, the complete cycle of the inverter compressor's startup, operation, and standby immediately preceding the first startup cycle. It is the cycle closest to the current operating condition and the cycle from which the latest operating data can be obtained, and is distinct from the earlier second startup cycle that generates the update flag.

[0059] The aforementioned first start-up rate refers to the ratio of the operating time of the inverter compressor to the total duration of that cycle (operating time + standby time) within the third operating cycle. It is an indicator that quantifies the refrigerator's cooling load within the third cycle. A higher first start-up rate indicates stronger cooling demand and a larger load in that third operating cycle; a lower first start-up rate indicates weaker cooling demand and a smaller load, providing a load reference for optimal speed adjustment.

[0060] Understandably, when the controller detects the update flag and the first and second startup cycles are not adjacent, the second startup cycle that generated the update flag has become outdated, and the corresponding old load demand may have changed. Therefore, the controller instead obtains the first startup rate from the latest previous startup cycle (the third startup cycle). This first startup rate accurately quantifies the current actual cooling load, replacing the old load data. This provides a reliable basis for subsequent adjustments to the optimal speed to adapt to the new operating conditions, avoiding lag in cooling response or ineffective energy consumption caused by blind adjustments.

[0061] S109. Control the operating speed of the variable frequency compressor according to the first start-up rate, and update the preferred speed when a new preferred speed is obtained, and delete the update flag bit.

[0062] In one embodiment, the first operating rate is the ratio of the inverter compressor's operating time to the total cycle time in the third operating cycle (the previous operating cycle), directly reflecting the strength of the cooling load in the previous operating cycle. If the first operating rate is high, it indicates that the inverter compressor operated for a large proportion of the previous operating cycle, indicating strong cooling demand and a large load. The controller can increase the inverter compressor's operating speed to enhance cooling capacity and match the current forced cooling demand. If the first operating rate is low, it indicates that the inverter compressor operated for a small proportion of the previous operating cycle, indicating weak cooling demand and a small load. The controller can reduce the inverter compressor's operating speed to cut unnecessary energy consumption and return to energy-saving operation.

[0063] As an example, during the process of adjusting the speed based on the operating rate, the controller can continuously monitor the operating status of the inverter compressor. When a certain adjusted operating speed can stably meet the cooling demand of the current operating conditions (such as small temperature fluctuations inside the unit, stable operating time of the inverter compressor, and no frequent start-stops), while also taking into account energy-saving goals (the speed should not be too high to avoid energy waste, nor too low to avoid frequent operation), and simultaneously meeting preset stable operating conditions (such as maintaining this speed for multiple consecutive cycles and achieving a cumulative stable operating time target), this speed is confirmed as the new preferred speed. In other words, the new preferred speed is the optimal speed adapted to the latest load, replacing the original old preferred speed.

[0064] It should be noted that the controller first dynamically adjusts the inverter compressor speed based on the latest first start-up rate. During the adjustment process, it filters and confirms a new optimal speed suitable for the current operating conditions. Then, it updates the original optimal speed to this new optimal speed and deletes the update flag, marking the complete completion of this optimal speed update process. This process ensures that the inverter compressor speed accurately matches the current actual cooling demand, avoiding energy waste and cooling lag caused by blind adjustments. Furthermore, by deleting the flag, it allows the refrigerator to return to a normal, stable, and energy-efficient operating state based on the new optimal speed, completing a full control closed loop of load identification, speed adjustment, and optimal speed iteration.

[0065] In another embodiment, the update flag must be retained if a new preferred speed is not obtained. In this case, the update flag for the preferred speed will still be detected when entering the next startup cycle.

[0066] As an example, taking the 5th cycle as the second start-up cycle N=5, the refrigerator triggers a sudden load change due to the addition of hot food. The original preferred speed a can no longer meet the cooling demand, and the controller generates an update flag to mark "preferred speed needs to be updated".

[0067] In the 6th cycle (N+1=6), the first start-up cycle is the 6th cycle, which is adjacent to the 5th cycle. At this time, the controller will detect the update flag of the preferred speed, but the controller does not need to perform the preferred speed update. It only maintains the operating speed control of the inverter compressor for normal refrigeration and retains the update flag.

[0068] However, in the 7th cycle (N+2=7), the first start-up cycle is the 7th cycle, which is not adjacent to the 5th cycle (N=5) where the update flag is generated (interval is 6 cycles). At this time, under non-adjacent start-up cycles, it starts operating at the original preferred speed. When the inverter compressor starts in the 7th cycle (the current first start-up cycle), the controller detects the update flag, and since the 7th cycle is not adjacent to the 5th cycle (the second start-up cycle), it controls the inverter compressor to operate at the original preferred speed 'a' to maintain basic cooling capacity, while preparing for the subsequent collection of the latest operating condition data.

[0069] Meanwhile, the previous cycle of the 7th cycle is the 6th cycle (i.e., the third power-on cycle), and the controller can calculate the first power-on rate of the 6th cycle.

[0070] At this point, in the 7th cycle, the controller can first control the variable frequency compressor speed based on the first start-up rate (e.g., from the preferred speed a to the operating speed a1). If the operating speed a1 is determined to be the new preferred speed in the 7th cycle, the preferred speed can be updated and the update flag bit deleted. Otherwise, if the operating speed a1 is not determined to be the new preferred speed in the 7th cycle, the update flag bit will remain until a new first start-up cycle (the 8th cycle, the new first start-up cycle N+3=8) begins.

[0071] In cycle 8, the controller still detects the update flag, and cycle 8 and cycle 5 (the second start-up cycle) are still not adjacent (intervals of cycles 6 and 7). The controller will continue to control the inverter compressor to run at the preferred speed 'a', and will again obtain the first start-up rate of the previous cycle (cycle 7, the new third start-up cycle) of cycle 8, and will adjust the operating speed to 'a2' again. At this time, it will re-determine whether the operating speed 'a2' is the new preferred speed. If it is determined that 'a2' is the new preferred speed, the original preferred speed 'a' will be updated to 'a2', and the update flag will be deleted, completing the entire iterative update process of the preferred speed. Otherwise, steps S107-S109 above will be executed again.

[0072] In this embodiment, for any startup cycle of the inverter compressor that is not the first power-on, since the update flag is used to instruct the controller to update the preferred speed in the next startup cycle, if the update flag for the preferred speed is not detected, it indicates that the inverter compressor was able to meet the cooling demand when running at the preferred speed in the previous startup cycle, and therefore there is no need to update the preferred speed in the current startup cycle. Alternatively, if the controller updated the preferred speed again in the previous startup cycle, there is also no need to update the preferred speed in this case. Based on this, the controller can control the inverter compressor to run at the preferred speed and count the first running time. Here, the startup cycle includes the startup running time and standby time of the inverter compressor. Subsequently, when the first time is longer than a first preset time, it can be considered that the refrigerator has experienced a sudden load change (such as frequent door opening and closing, or the addition of stored hot food) leading to an increased cooling demand. At this time, running at the preferred speed for the first preset time will still not be able to meet the cooling demand. Based on this, it can be considered that the preferred speed does not meet the requirements, and therefore, the aforementioned update flag can be generated to regenerate the preferred speed to match the load change. Furthermore, to quickly meet cooling demands, the inverter compressor's optimal speed can be simultaneously adjusted to its highest speed until the refrigerator meets the preset shutdown requirement and enters standby mode. Also, if an update flag for the optimal speed is detected during inverter compressor operation, and the first startup cycle and the second startup cycle that generated the update flag are adjacent startup cycles, it indicates that the controller considered the optimal speed to be mismatched with a sudden load change in the previous startup cycle (the second startup cycle). In this case, since updating the optimal speed requires adjustment based on an accurate operating rate, the controller can control the inverter compressor to operate at the optimal speed, record the second startup duration of the inverter compressor, and control the compressor's operating speed based on the second startup duration until the refrigerator meets the shutdown requirement and enters standby mode, providing a reference operating rate for quickly adjusting to a new energy-saving operating speed (the new optimal speed). Furthermore, if an update flag for the optimal speed is detected during inverter compressor operation, it indicates that the controller needs to update the optimal speed. Furthermore, since the first and second start-up cycles are not adjacent, and the third start-up cycle is the preceding start-up cycle of the first start-up cycle, the first start-up rate is the ratio of the second operating time of the variable frequency compressor in the third start-up cycle to the total cycle time. Therefore, the first start-up rate of the third start-up cycle can be obtained as a reference start-up rate for the optimal speed. Finally, the controller can control the variable frequency compressor to run at the original optimal speed before obtaining a new optimal speed, and control the operating speed of the variable frequency compressor based on the first start-up rate. After obtaining a new optimal speed during the operation of the variable frequency compressor, the original optimal speed is updated, and the update flag is deleted. Thus, the controller directly operates and adjusts based on the optimal speed to obtain a new optimal speed, eliminating the need to start from a high speed and shortening the speed update cycle.Furthermore, by obtaining the new optimal speed and deleting the update flag, the scenario where the optimal speed was not detected can be re-executed in subsequent startup cycles. Thus, through the aforementioned layered startup rate adaptation adjustment and startup cycle adaptation control logic, the speed adaptability and long-term operating performance of the sensorless refrigerator can be comprehensively improved.

[0073] In another embodiment, the controller can also be based on, for example... Figure 4 The steps S401-S402 shown control the operating speed of the variable frequency compressor. Details are as follows: S401. If the second running time is greater than the second preset time and the current running speed of the variable frequency compressor is less than the maximum speed, then the current running speed of the variable frequency compressor is added to the first preset speed to obtain a new current running speed.

[0074] In one embodiment, the second preset duration is a time threshold preset by the controller, used to determine the refrigeration adaptability of the current inverter compressor operating speed. For example, the second preset duration can be 60 minutes.

[0075] In adjacent start-up cycles, if the second running time of the inverter compressor at the original preferred speed exceeds the threshold, it indicates that the cooling capacity of the current operating speed is insufficient to quickly meet the cooling demand, and the cooling efficiency needs to be enhanced by increasing the frequency.

[0076] It should be noted that if the current operating speed of the inverter compressor is lower than the preset maximum speed, it indicates that there is still room for increasing the current operating speed, and the cooling capacity can be enhanced by increasing the operating speed. When both of the above conditions are met, the controller can increase the current operating speed of the inverter compressor by a first preset speed, gradually increasing the cooling capacity. This avoids the energy waste caused by directly increasing to the maximum speed, and can quickly improve the cooling efficiency until the shutdown conditions are met, providing accurate data support for subsequent iterations to select a new optimal speed.

[0077] S402. If the second running time is less than or equal to the second preset time, and / or the current running speed of the variable frequency compressor is equal to the maximum speed, then control the variable frequency compressor to maintain the current running speed.

[0078] In one embodiment, if the second running time is less than or equal to the second preset time, it indicates that the cooling capacity of the current operating speed matches the cooling demand, the cooling efficiency meets the standard, and there is no need to increase the frequency. Furthermore, if the variable frequency compressor is currently operating at its maximum speed, it indicates that the speed limit has been reached, there is no room for increasing the frequency, and it can only maintain operation.

[0079] In one embodiment, the above steps serve to stably collect real operating data at the current operating speed, maintain the speed to ensure the accuracy of the second operating time statistics, provide a reliable basis for subsequent calculation of reference start-up rate and iteration of new energy-saving optimal speed, and avoid distortion of operating data due to arbitrary adjustment of speed.

[0080] It should be noted that when the update flag of the preferred speed is detected, and the first start-up cycle and the second start-up cycle that generated the update flag are adjacent start-up cycles, the purpose of controlling the operating speed through the above steps S401-S402 is not for rapid cooling, but to collect an accurate reference start-up rate for iterating a new energy-saving preferred speed. If the second running time is longer than the second preset time and the speed is directly increased to the maximum speed, the actual running time of the inverter compressor will be significantly shortened, causing the statistical running time to fail to accurately reflect the real load. Consequently, the start-up rate calculated based on this distorted running time will also deviate from the actual operating conditions, ultimately failing to iterate an energy-saving preferred speed suitable for long-term operating conditions.

[0081] At this time, when the second power-on cycle that generates the update flag is adjacent to the first power-on cycle, the method of slightly increasing the first preset speed can not only gradually verify the speed adaptability and correct the cooling efficiency, but also ensure the validity of the running time data and ensure the accuracy of the subsequent reference power-on rate.

[0082] In this embodiment, when the second running time is greater than the second preset time but has not reached the maximum speed, the frequency is increased slightly to gradually verify and optimize the cooling adaptability while ensuring the validity of the operating data. Furthermore, when the second running time is less than or equal to the second preset time, and / or the current operating speed of the inverter compressor is equal to the maximum speed, the speed is kept stable to ensure accurate statistics of the second running time and subsequent reference operating rate. This provides reliable data support for iteratively adapting to new energy-saving optimal speeds under long-term operating conditions, avoiding data distortion caused by direct frequency increases and reducing energy waste from ineffective speed adjustments.

[0083] In another embodiment, the controller can also be based on, for example... Figure 5 The steps S501-S505 shown control the operating speed of the variable frequency compressor. Details are as follows: S501. Determine the target operating speed based on the first operating rate.

[0084] S502. Adjust the operating speed of the variable frequency compressor to the target operating speed.

[0085] In one embodiment, the target operating speed can be the speed obtained by adjusting the current operating speed by the controller. For example, the controller can pre-set multiple operating rate ranges and set a speed adjustment value for each operating rate range. Then, the speed adjustment value corresponding to the first operating rate is determined and superimposed with the current operating speed to obtain the aforementioned target operating speed.

[0086] In one embodiment, the controller can generate a control command for the target operating speed and send it to the variable frequency compressor to instruct the variable frequency compressor to adjust the operating speed to the target operating speed.

[0087] S503, Statistical analysis of the cumulative time the variable frequency compressor operates at the target speed during multiple start-up cycles.

[0088] S504. If the cumulative duration is greater than or equal to the third preset duration, the target operating speed is determined as the new preferred speed.

[0089] S505. If the cumulative duration is less than the third preset duration, the target operating speed will not be determined as the new preferred speed.

[0090] In one embodiment, the cumulative duration refers to the total actual operating time of the variable frequency compressor at the target operating speed (the temporary operating speed calculated based on the first operating rate) in multiple operating cycles, after the update flag is generated and the first uptime calculation is completed. The cumulative duration is the sum of the operating times at the target operating speed in all participating operating cycles, used to verify whether the target operating speed enables stable operation of the variable frequency compressor.

[0091] The aforementioned third preset duration is a fixed time threshold (e.g., 12h) built into the controller, which serves as a standard for determining whether the target operating speed can be upgraded to the new preferred speed.

[0092] It should be noted that a single start-up cycle is usually shorter than the third preset duration. In this case, the target operating speed determined by a single start-up cycle cannot reflect the refrigerator's long-term actual load.

[0093] It should be added that when the cumulative duration corresponding to the target operating speed is less than the third preset duration, it proves that the target operating speed has not passed the long-term stability verification and does not meet the conditions for upgrading to the preferred speed. At this time, the controller can execute cyclic iterative control logic.

[0094] For example, in the current first start-up cycle, the inverter compressor can continuously run at the current target operating speed until the refrigerator's shutdown requirement is met, at which point it stops and enters a normal standby state. In the next start-up cycle, the inverter compressor starts up again. Since the update flag has not been deleted, the controller will re-execute the entire judgment process, obtain the latest first start-up rate from the previous start-up cycle, and recalculate and generate a new target operating speed. Then, the controller can drive the inverter compressor to run at the new target operating speed and independently count the runtime of this new target operating speed. Furthermore, if the new target operating speed is the same as the target operating speed of the previous start-up cycle, the second runtime of the same target operating speed in each first start-up cycle can be accumulated to obtain the corresponding cumulative duration, which is then compared with a third preset duration for judgment. Finally, the above iterative, statistical, and judgment processes are repeated until the cumulative duration corresponding to a certain target operating speed meets the condition of ≥ the third preset duration. At this point, it is marked as the new preferred speed, the update flag is deleted, the iterative process is exited, and the system returns to the normal energy-saving operation mode.

[0095] In this embodiment, the target operating speed is determined based on a first start-up rate, and the inverter compressor is adjusted to operate at that target speed. The cumulative duration of this adjustment over multiple start-up cycles is then recorded. Subsequently, using a third preset duration as a threshold, the target operating speed is not determined as the new preferred speed if the cumulative duration is less than the third preset duration; otherwise, the target operating speed is determined as the new preferred speed only if the cumulative duration is greater than or equal to the third preset duration. This ensures that the speed adjustment aligns with the latest cooling load conditions and eliminates temporary operating condition interference through multi-cycle cumulative verification, ensuring the long-term stability and adaptability of the new preferred speed. This effectively balances cooling demand and energy-saving goals while avoiding setting temporarily adaptable or unstable speeds as preferred speeds.

[0096] In another embodiment, the controller can also be based on, for example... Figure 6 The steps S601-S605 shown control the operating speed of the variable frequency compressor based on the first start-up rate. Details are as follows: S601. If the first start-up rate is between the preset second start-up rate and the third start-up rate, then the preferred speed is determined as the target operating speed.

[0097] In one embodiment, the second start-up rate and the third start-up rate are two preset start-up rate thresholds used to classify the cooling load level. The second start-up rate is a low load threshold, and the third start-up rate is a high load threshold. The relationship between the first start-up rate and the two thresholds directly corresponds to different speed adjustment strategies.

[0098] S602. If the first start-up rate is less than the second start-up rate, and the stop speed of the variable frequency compressor during the third start-up cycle is greater than the preset minimum speed, then the preferred speed is subtracted from the second preset speed to obtain the target operating speed.

[0099] S603. If the first operating rate is less than the second operating rate, and the shutdown speed is equal to the minimum speed, then the shutdown speed is determined as the target operating speed.

[0100] S604. If the first start-up rate is greater than the third start-up rate, the preferred speed and the third preset speed are added together to obtain the target operating speed.

[0101] S605. Adjust the preferred speed to the target operating speed.

[0102] In one embodiment, the aforementioned shutdown speed is the instantaneous speed at which the inverter compressor stops operating when it meets the shutdown requirements in the third start-up cycle (the cycle preceding the first start-up cycle). It is a reference speed reflecting the refrigeration adaptation status at the end of the previous cycle. Furthermore, the minimum speed is the minimum operating speed allowed by the inverter compressor's design. It is the lower limit to ensure the refrigerator's basic refrigeration capacity, and the speed must not fall below this value to avoid insufficient refrigeration.

[0103] The second preset speed is a preset fixed frequency reduction step size, used to slightly reduce the speed in low-load scenarios to achieve energy-saving optimization. The third preset speed is a preset fixed frequency increase step size, used to slightly increase the speed in high-load scenarios to enhance cooling capacity.

[0104] The second preset speed can be equal to, less than, or greater than the third preset speed; there is no limitation on this. For example, the third preset speed is greater than the second preset speed. For instance, the third preset speed can be 300 rpm, and the second preset speed can be 150 rpm.

[0105] It should be noted that in step S602, when a new target operating speed is obtained after reducing the second preset speed, if the new target operating speed is less than the minimum speed, then the minimum speed needs to be determined as the new target operating speed.

[0106] In this embodiment, by setting the third preset speed for frequency increase to be greater than the second preset speed for frequency decrease, differentiated optimization of cooling demand response and energy-saving regulation can be achieved. In high-load scenarios, increasing the frequency by a larger step size can quickly increase the speed of the inverter compressor, enhance cooling capacity, efficiently respond to forced cooling demand, and avoid cooling lag. In low-load scenarios, decreasing the frequency by a smaller step size can accurately and smoothly optimize the speed, gradually achieving energy savings while ensuring basic cooling capacity, avoiding insufficient cooling due to excessive frequency decrease, and simultaneously ensuring the stability and accuracy of speed regulation.

[0107] In one embodiment, the controller precisely determines the target operating speed in four scenarios based on the interval relationship between the first, second, and third operating rates: when the first operating rate is between the second and third operating rates, the shutdown speed of the previous cycle is directly used as the target operating speed; when the first operating rate is less than the second operating rate, if the shutdown speed is higher than the minimum speed, the preferred speed is subtracted from the second preset speed; if it equals the minimum speed, the shutdown speed is directly adopted; when the first operating rate is greater than the third operating rate, the preferred speed and the third preset speed are added together, and finally the inverter compressor is adjusted to the determined target operating speed. Furthermore, by dividing the operating rate intervals, precise speed adjustment is achieved for different scenarios, which not only meets the cooling needs of different loads but also adjusts the speed in small increments with fixed steps to avoid drastic speed fluctuations. At the same time, the reasonableness of the adjustment is ensured by relying on reference values ​​such as the shutdown speed and the minimum speed. This effectively improves the accuracy of speed adaptation, balances cooling performance and energy saving, adapts to the operating characteristics of refrigerators without ambient temperature sensors, and optimizes long-term operational stability.

[0108] In another embodiment, after controlling the operating speed of the variable frequency compressor according to the first start-up rate, the controller can also determine the operating speed according to, for example, the speed of the variable frequency compressor according to ... Figure 7 The steps S701-S703 shown below re-adjust the target operating speed. Details are as follows: S701. Determine the third operating time of the variable frequency compressor within the first start-up cycle.

[0109] S702. If the third running time is greater than the fourth preset time and the target running speed is less than the maximum speed, then the target running speed is added to the fourth preset speed to obtain a new target running speed.

[0110] S703. If the third running time is less than or equal to the fourth preset time, and / or the target running speed is equal to the maximum speed, then control the variable frequency compressor to maintain the target running speed.

[0111] In one embodiment, the third running time is the actual running time of the variable frequency compressor within the current first start-up cycle. It is an indicator for judging the cooling adaptability of the current target operating speed and is used to evaluate whether the speed can efficiently meet the cooling demand of the current cycle.

[0112] The aforementioned fourth preset duration is a time threshold preset by the controller, used to determine the cooling efficiency at the target operating speed. If the third operating duration exceeds this threshold, it indicates that the inverter compressor's cooling capacity at the target operating speed is insufficient in the current first start-up cycle, and the cooling efficiency needs to be optimized by increasing the frequency. For example, the aforementioned fourth preset duration can be 60 minutes.

[0113] The aforementioned fourth preset speed is a preset fixed frequency ramp step size, used to slightly increase the target operating speed when the cooling efficiency is insufficient, gradually enhancing the cooling capacity while ensuring the stability of speed regulation. For example, the aforementioned fourth preset speed can be 300 rpm.

[0114] In this embodiment, the rotational speed is precisely adjusted according to different scenarios by comparing the third running time with the fourth preset time and combining the relationship between the first operating speed and the maximum speed. When the third running time is too long and the maximum speed is not reached, the frequency is increased slightly by the fourth preset speed to gradually optimize the cooling adaptability. When the third running time is less than or equal to the fourth preset time, and / or the target operating speed is equal to the maximum speed, the target operating speed is kept stable to ensure the accuracy of the third running time statistics. This provides reliable data support for subsequent iterations of new optimal speeds, avoiding the distortion of operating data caused by direct and large frequency increases, while effectively improving cooling efficiency and balancing cooling performance and energy saving.

[0115] As an example, regarding steps S107-S109, and the above... Figures 5-7 The flowchart is referenced. Figure 8 , Figure 8 This is a flowchart illustrating a refrigerator control method provided in one embodiment of this application, used to describe an example of steps S107-S109. Specifically, for a scenario where an update flag indicating a preferred operating speed is detected, and the first and second operating cycles are not adjacent, the inverter compressor is controlled to operate at the preferred operating speed. Next, the first operating rate of the third operating cycle is obtained, and it is determined whether the first operating rate is between the second and third operating rates. If yes, the target operating speed is set to the minimum operating speed; if no, it is further determined whether the first operating rate is less than the second operating rate; if the first operating rate is less than the second operating rate, it is further determined whether the shutdown speed is greater than the minimum operating speed; if yes, the target operating speed = preferred operating speed - second preset speed; if no, the target operating speed = minimum speed; if the first operating rate is not less than the second operating rate, the target operating speed = preferred operating speed + third preset speed. After determining the target operating speed, the inverter compressor speed can be adjusted to the target operating speed. Next, the third operating time of the variable frequency compressor within the first start-up cycle is determined. It is then checked whether this third operating time is greater than the fourth preset time and whether the target speed is less than the maximum speed. If so, the new target operating speed is set to the original target speed plus the fourth preset speed, and the process returns to the step of adjusting the variable frequency compressor speed. If not, the variable frequency compressor is controlled to maintain the current target speed. Finally, the cumulative time the variable frequency compressor operates at the target operating speed across multiple start-up cycles is calculated, and it is determined whether the cumulative time is greater than or equal to the third preset time. If so, the target operating speed is set as the new preferred speed, and the update flag is deleted. Otherwise, the update flag is retained, and the above process continues in the next start-up cycle.

[0116] In another embodiment, for any startup cycle of the variable frequency compressor that is not the first power-on, the controller can also control the variable frequency compressor to run at a preset oiling speed for a fifth preset time during startup. After the fifth preset time, the speed of the variable frequency compressor is adjusted to a preferred speed.

[0117] The aforementioned preset oiling speed is a preset operating speed designed for the lubrication system, which is different from the conventional refrigeration operating speed. Its speed parameters match the oil supply characteristics of the internal oil circuit of the variable frequency compressor, which can quickly and efficiently deliver lubricating oil to the core moving friction pairs such as bearings and pistons, ensuring adequate lubrication.

[0118] The aforementioned fifth preset duration is a fixed time that ensures the variable frequency compressor completes sufficient lubrication at a preset oiling speed. This duration is set based on the variable frequency compressor structure, lubricant properties, environmental conditions, etc., and can ensure that a stable oil film is established in the oil circuit, covering all friction parts. For example, the aforementioned fifth preset duration can be 30 seconds.

[0119] In this embodiment, by running at a preset oiling speed for a fifth preset time during the startup phase, a stable lubricating oil film can be quickly established in the initial stage of variable frequency compressor startup. This avoids dry or semi-dry friction caused by insufficient residual oil in the oil circuit or failure of the oil film to recover during startup, effectively reducing wear on moving parts and extending the service life of the variable frequency compressor. At the same time, ensuring sufficient lubrication before switching to the preferred speed balances lubrication protection with the efficiency and stability of subsequent refrigeration operation.

[0120] In one embodiment, the above examples are all for the operation control of any start-up cycle of the variable frequency compressor that is not powered on for the first time. For the start-up cycle of the first power-on, refer to Figure 9 , Figure 9 This is a schematic diagram illustrating an application scenario of adjusting the speed of an inverter compressor during initial power-on in related technologies. The horizontal axis represents time (minutes), covering 0-210 minutes, completely recording the entire temperature-up cycle from initial cooling to temperature stabilization after the refrigerator's initial power-on. The left vertical axis represents temperature (°C), ranging from -50°C to 130°C, characterizing the temperature changes in the refrigerator's core cooling compartment. The right vertical axis represents power / current (power is in watts, current corresponds to the scale on the right), ranging from -320 to 320, simultaneously reflecting the power and current fluctuations of the inverter compressor and the entire unit.

[0121] Upon initial power-on, a sharp power overload peak was observed (exceeding 280W, with some models exceeding 300W), followed by a rapid decline, eventually stabilizing at a normal operating power level of approximately 130W, fully demonstrating the power change process from overload to stability. Furthermore, curve 2 exhibits a completely consistent trend with curve 1, showing a synchronous current peak at the initial power-on stage, which then synchronously decreases to a stable state as the power drops, directly reflecting the synchronous overload and stability changes of the current with power fluctuations.

[0122] Curve 3 initially represents the ambient temperature, which drops rapidly as the inverter compressor operates, eventually stabilizing in the range of -20℃ to -30℃. It represents the temperature change curve of the refrigerator's freezer compartment and other refrigeration chambers, reflecting the refrigeration process from ambient temperature to the target low temperature and maintaining a steady state.

[0123] In related technologies, the variable frequency compressor initially operates at the oil-lubricating speed to ensure lubrication, and then directly jumps to the maximum allowable speed for continuous operation. This logic directly causes curve changes: because the oil-lubricating speed operation time is too short, the pressure on both the suction and discharge sides of the variable frequency compressor refrigeration system is not balanced before the frequency is forcibly increased to the maximum speed, causing the power (curve 1) and current (curve 2) to be momentarily overloaded, resulting in sharp peaks; as the system gradually stabilizes, the power and current quickly drop back to steady-state levels; while the peak power stage corresponds to the high-load, powerful cooling of the variable frequency compressor, so the temperature curve (curve 3) drops rapidly. After the power and current stabilize, the temperature also gradually stabilizes to the target low-temperature range, forming a linkage change in power / current, which first reaches an overload peak and then stabilizes, and temperature, which first rapidly rises and then stabilizes.

[0124] Based on the above explanation, when a momentary power overload occurs, the refrigerator's maximum power exceeds 280W (some even exceed 300W), while the power after stabilization is only about 130W, a significant difference between the peak power and the steady-state value. This phenomenon of current overload and power overload will require additional investment in safety compliance (such as strengthening electrical safety design and selecting protection devices to cope with overload), thus optimizing product costs.

[0125] Therefore, in order to avoid power overload during initial power-on, the controller can, according to, Figure 10 The steps S1001-S1004 shown control the speed of the inverter compressor upon initial power-on. Details are as follows: S1001. If it is detected that the refrigerator is being powered on for the first time, control the inverter compressor to run at the preset oiling speed for the sixth preset time.

[0126] In one embodiment, the preset oiling speed and its function have already been explained above and will not be repeated here. It should be noted that the sixth preset duration can be the same as or longer than the fifth preset duration; there is no limitation on this.

[0127] S1002. After the sixth preset time, adjust the preset oiling speed to the preset transition speed.

[0128] The preset transition speed is greater than the preset lubrication speed, but less than the maximum speed.

[0129] In one embodiment, the preset transition speed is a preset operating speed of the variable frequency compressor that is between the preset lubrication speed and the maximum allowable speed. Its speed level is higher than the lubrication speed (to meet basic refrigeration needs) and lower than the maximum speed (to avoid sudden changes in system load). It is used as a buffer speed between the lubrication stage and the high-load refrigeration stage, allowing the variable frequency compressor refrigeration system (suction and discharge pressure, internal oil circuit) to gradually adapt to the higher load operating state, avoiding pressure imbalance and power / current overload problems caused by directly jumping to the maximum speed.

[0130] It should be noted that after the variable frequency compressor completes the sixth preset time of oiling speed operation (completing initial lubrication and establishing a stable oil film), the speed adjustment action is performed to adjust the operating speed of the variable frequency compressor from the preset oiling speed to the preset transition speed. By increasing the speed, a transition is prepared for subsequent refrigeration operation under higher loads, ensuring uninterrupted lubrication while avoiding system shock caused by a sudden increase in speed.

[0131] S1003. If the fourth running time of the inverter compressor is longer than the seventh preset time, the preset transition speed is adjusted to the highest speed until the refrigerator meets the preset shutdown requirements and then enters the standby state.

[0132] S1004. If the fourth running time of the inverter compressor is less than or equal to the seventh preset time, the preset transition speed is maintained until the refrigerator meets the preset shutdown requirements and enters standby mode, or the fourth running time is greater than the seventh preset time.

[0133] In one embodiment, the seventh preset time period is a preset threshold used to determine whether the refrigeration system (pressures on both the suction and discharge sides, and internal oil circuits) has achieved sufficient balance and stability when the variable frequency compressor is running at a preset transition speed. As an example, the seventh preset time period can be 30 minutes.

[0134] It should be noted that the purpose of controlling the inverter compressor to operate at a transitional speed is to ensure that the refrigerator has a high cooling capacity while allowing the refrigerator to reach a stable equilibrium between the pressure on both sides of the refrigeration system and the peak current and power of the inverter compressor before adjusting to the highest speed. This avoids excessive current and power overload, which could damage the refrigerator's electrical system. Furthermore, this can reduce investment in heat dissipation for the control board and the use of related consumables.

[0135] In one embodiment, reference is made toFigure 11 , Figure 11 This is a schematic diagram illustrating an application scenario of adjusting the speed of a variable frequency compressor in a refrigerator control method provided in another embodiment of this application. (Refer to...) Figure 11 The horizontal axis represents time (minutes), ranging from 0 to 210 minutes, recording the entire operating cycle of the refrigerator from initial power-on, through cooling, temperature stabilization, and compressor shutdown. The left vertical axis represents temperature (°C), ranging from -40°C to 110°C, characterizing the temperature change trend of the refrigerator's core cooling compartment (such as the freezer compartment), reflecting the cooling temperature stabilization and steady-state effects. The right vertical axis represents power (W), ranging from -30W to 300W, synchronously reflecting the power fluctuations during the operation of the inverter compressor (the current curve and power curve show completely consistent trends), demonstrating load changes at different speed stages.

[0136] Curves 1 and 2 are power / current curves (corresponding to the right vertical axis, curve 1 is power and curve 2 is current, with the same trend), and curve 3 is the cabin temperature curve (corresponding to the left vertical axis, such as the freezer). Their changes match the initial power-on control logic.

[0137] Specifically, in the initial lubrication stage, the controller detects that the refrigerator is powered on for the first time and controls the variable frequency compressor to run at the preset oiling speed for the sixth preset time. In this stage, the lubricating oil film is established, and the power / current curves (1, 2) show the first sharp peak (the operating power corresponding to the oiling speed). The temperature curve (3) only drops slightly. Because the oiling stage is mainly for lubrication, the refrigeration efficiency is low.

[0138] During the transition speed switching phase, after the sixth preset time, the controller adjusts the speed of the variable frequency compressor from the preset oiling speed to the preset transition speed (between the oiling speed and the maximum speed). During this phase, the transition speed is higher than the oiling speed, the cooling load increases, the power / current curves (1, 2) show a second peak (the amplitude is slightly lower than the first peak), and the temperature curve (3) begins to drop rapidly, entering the effective cooling phase.

[0139] During the transition speed operation and frequency increase phase, the controller monitors the fourth operating time of the variable frequency compressor at the transition speed and compares it with the seventh preset time. If the fourth operating time is greater than the seventh preset time (indicating that the suction and discharge pressure and oil circuit of the refrigeration system have been fully balanced), the controller will adjust the transition speed to the highest speed. During this phase, the power / current curves (1, 2) remain at a high and stable level (high load refrigeration power at the highest speed), and the temperature curve (3) drops rapidly, quickly falling to the target low temperature until the preset shutdown conditions are met. The power / current drops to the controller's standby power consumption level, and the temperature stabilizes in the target range of around -30℃.

[0140] If the fourth running time is less than or equal to the seventh preset time, the controller maintains the transition speed, the power / current curves (1, 2) maintain a stable power level corresponding to the transition speed, and the temperature curve (3) continues to decline gradually until the shutdown condition is met and the system is put into standby mode. Alternatively, if the fourth running time exceeds the seventh preset time, the frequency will be increased to the highest speed to complete the remaining cooling, and the system will eventually achieve a stable temperature shutdown.

[0141] In this embodiment, upon initial power-on, the inverter compressor is controlled to run at a preset oiling speed for a sixth preset duration. This quickly establishes a stable lubricating oil film, providing sufficient lubrication protection for the inverter compressor's startup. Subsequently, the speed is adjusted to a preset transition speed between the oiling speed and the maximum speed, forming a speed buffer transition and preventing a sudden increase in speed from impacting the refrigeration system. Finally, by combining the fourth and seventh preset durations of the inverter compressor's operation, the frequency is increased to the maximum speed only after the system pressure and oil circuit are fully stable. This effectively avoids the problems of power current overload and accelerated wear of moving parts caused by increasing the frequency before the system is balanced. It also allows for timely enhancement of refrigeration efficiency at the maximum speed after stabilization, quickly meeting the refrigeration requirements of the refrigerator's preset settings, optimizing the refrigeration effect and overall operational reliability after initial power-on.

[0142] In another embodiment, upon detecting that the refrigerator is operating for the first time, an update flag bit also needs to be generated. During the next startup cycle after the first power-on, the preferred rotation speed is a preset preferred rotation speed.

[0143] In one embodiment, the aforementioned preset preferred speed can be the default speed preset at the factory when the refrigerator leaves the factory, which serves as the initial operating reference for the inverter compressor. In the absence of historical operating data and optimized preferred speed, it provides a standardized initial speed basis for the start-up and operation of the inverter compressor, and is the basic reference speed for speed control logic.

[0144] The next start-up cycle after the first power-on operation refers to the start-up cycle when the refrigerator restarts the inverter compressor for the first time after completing the complete operation process of the first power-on (from starting cooling to meeting the shutdown conditions and entering standby). This is due to the cooling demand such as the rise in the compartment temperature. It is the first non-first power-on start-up cycle after the first power-on.

[0145] It should be noted that the next power-on cycle after the initial power-on is not the initial power-on cycle and has an update flag bit; therefore, step S104 will be executed, proceeding to the above-mentioned steps. Figures 1-8 Control process.

[0146] In this embodiment, by generating an update flag bit when the refrigerator is first powered on, and setting the preferred speed to a preset preferred speed in the next startup cycle, a stable reference speed is provided for the initial stage where there is no historical operating data, avoiding control logic anomalies caused by the lack of a preferred speed. This ensures the smooth start-up and operation of the inverter compressor in the startup cycle after the first power-on, and provides an initial foundation for subsequent speed optimization processes based on the operating rate. This ensures that the entire speed control logic is executed orderly and reliably from the initial stage, improving the consistency and stability of the overall machine operation.

[0147] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0148] In another embodiment, such as Figure 1 As shown, the refrigerator can be used to implement the refrigerator control method described in the above method embodiments.

[0149] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A refrigerator characterized by comprising: The method comprises the following steps: a variable frequency compressor configured to adjust the running speed of the variable frequency compressor in response to the control instruction of a controller; the controller is configured to: for any start-up period of the variable frequency compressor other than the first power-on, when the variable frequency compressor is running, if the update flag of the preferred speed is not detected, the first duration of the variable frequency compressor running at the preferred speed is counted; the start-up period includes the running time and standby time of the variable frequency compressor; the update flag is used to indicate that the controller updates the preferred speed in the next start-up period; if the first duration is greater than the first preset duration, the update flag is generated; adjust the preferred speed of the variable frequency compressor to the highest speed until the refrigerator meets the preset gear stop requirement and enters the standby state; when the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up period and the second start-up period in which the update flag is generated are adjacent start-up periods, control the variable frequency compressor to run at the preferred speed; the first start-up period is the start-up period of the current running of the variable frequency compressor; count the second running duration of the variable frequency compressor running; control the running speed of the variable frequency compressor according to the second running duration until the refrigerator meets the gear stop requirement and enters the standby state; when the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up period and the second start-up period are not adjacent start-up periods, control the variable frequency compressor to run at the preferred speed; obtain the first start-up probability of the third start-up period; the third start-up period is the last start-up period of the first start-up period; control the running speed of the variable frequency compressor according to the first start-up probability, and update the preferred speed and delete the update flag if a new preferred speed is obtained.

2. The refrigerator according to claim 1, characterized in that, The controller controls the running speed of the variable frequency compressor according to the second running duration, which is configured to: if the second running duration is greater than the second preset duration, and the current running speed of the variable frequency compressor is less than the highest speed, add the current running speed of the variable frequency compressor and the first preset speed to obtain a new current running speed; if the second running duration is less than or equal to the second preset duration, and / or the current running speed of the variable frequency compressor is equal to the highest speed, control the variable frequency compressor to maintain the current running speed.

3. The refrigerator according to claim 1, characterized in that, The controller controls the running speed of the variable frequency compressor according to the first start-up probability, which is configured to: determine the target running speed according to the first start-up probability; adjust the running speed of the variable frequency compressor to the target running speed; count the cumulative duration of the variable frequency compressor running at the target running speed in multiple start-up periods; if the cumulative duration is greater than or equal to the third preset duration, determine the target running speed as the new preferred speed; If the accumulated time length is less than the third preset time length, the target running speed is not determined as a new preferred speed.

4. The refrigerator according to claim 3, characterized in that, The controller is configured to determine a target running speed according to the first start-up probability, and the controller is configured to: If the first start-up probability is between a second preset start-up probability and a third preset start-up probability, the preferred speed is determined as the target running speed; If the first start-up probability is less than the second preset start-up probability, and a stop running speed of the variable frequency compressor during the third start-up period is greater than a preset minimum speed, the target running speed is obtained by subtracting a second preset speed from the preferred speed; If the first start-up probability is less than the second preset start-up probability, and the stop running speed is equal to the minimum speed, the stop running speed is determined as the target running speed; If the first start-up probability is greater than the third preset start-up probability, the target running speed is obtained by adding a third preset speed to the preferred speed; The preferred speed is adjusted to the target running speed.

5. The refrigerator according to claim 4, characterized in that, The third preset speed is greater than the second preset speed.

6. The refrigerator according to claim 3, characterized in that, After the controller controls the running speed of the variable frequency compressor according to the first start-up probability, the controller is further configured to: determine a third running time length during which the variable frequency compressor runs in the first start-up period; If the third running time length is greater than a fourth preset time length, and the target running speed is less than a maximum speed, the target running speed is added to a fourth preset speed to obtain a new target running speed; If the third running time length is less than or equal to the fourth preset time length, and / or the target running speed is equal to the maximum speed, the variable frequency compressor is controlled to maintain the target running speed.

7. The refrigerator according to any one of claims 1 to 6, characterized in that, The controller is further configured to: for any start-up period of the variable frequency compressor other than the first start-up period, when the variable frequency compressor is started and runs, the variable frequency compressor is controlled to run at a preset oiling speed for a fifth preset time length; after the fifth preset time length, the speed of the variable frequency compressor is adjusted to the preferred speed.

8. The refrigerator according to any one of claims 1 to 6, characterized in that, The controller is further configured to: If it is detected that the refrigerator is started for the first time, the variable frequency compressor is controlled to run at a preset oiling speed for a sixth preset time length; after the sixth preset time length, the preset oiling speed is adjusted to a preset transition speed; the preset transition speed is greater than the preset oiling speed and less than a maximum speed; If a fourth running time length of the variable frequency compressor is greater than a seventh preset time length, the preset transition speed is adjusted to the maximum speed until the refrigerator meets a preset gear stop requirement and enters a standby state; If the fourth running time length of the variable frequency compressor is less than or equal to the seventh preset time length, the preset transition speed is maintained until the refrigerator meets the preset gear stop requirement and enters the standby state, or the fourth running time length is greater than the seventh preset time length.

9. The refrigerator according to claim 8, characterized in that, The controller is further configured to: when it is detected that the refrigerator is started for the first time, the update flag is generated; in the next start-up period of the first start-up period, the preferred speed is a preset preferred speed. 10.A control method of a refrigerator, characterized by, The application is applied to a refrigerator, the refrigerator comprising a variable frequency compressor for adjusting the running speed of the variable frequency compressor in response to the control instruction of a controller; the control method of the refrigerator comprises: For any start-up cycle of the variable frequency compressor after the first power-on, when the variable frequency compressor is running, if the update flag of the preferred speed is not detected, the first duration of the variable frequency compressor running at the preferred speed is counted; the start-up cycle comprises the running time and standby time of the variable frequency compressor; the update flag is used to indicate that the controller updates the preferred speed in the next start-up cycle; If the first duration is greater than the first preset duration, the update flag is generated; The preferred speed of the variable frequency compressor is adjusted to the highest speed until the refrigerator meets the preset gear stop requirement and enters the standby state; When the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up cycle and the second start-up cycle in which the update flag is generated are adjacent start-up cycles, the variable frequency compressor is controlled to run at the preferred speed; the first start-up cycle is the start-up cycle in which the variable frequency compressor is currently running; The second running duration of the variable frequency compressor is counted; The running speed of the variable frequency compressor is controlled according to the second running duration until the refrigerator meets the gear stop requirement and enters the standby state; When the variable frequency compressor is running, if the update flag of the preferred speed is detected, and the first start-up cycle and the second start-up cycle are not adjacent start-up cycles, the variable frequency compressor is controlled to run at the preferred speed; The first start-up probability of the third start-up cycle is obtained; the third start-up cycle is the last start-up cycle of the first start-up cycle; The running speed of the variable frequency compressor is controlled according to the first start-up probability, and the preferred speed is updated and the update flag is deleted if a new preferred speed is obtained.

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