Refrigerator and control method thereof

Abstract

The application discloses a refrigerator and a control method of the refrigerator, and relates to the technical field of refrigerators. The refrigerator comprises a variable-frequency compressor configured to adjust the running speed of the variable-frequency compressor in response to a control instruction of a controller; and the controller is configured to, for any start-up cycle of the variable-frequency compressor after the first power-on, generate an update flag bit when the first time length is greater than a first preset time length if the update flag bit of the preferred speed is not detected during the start-up operation; control the running speed according to the second running time of the variable-frequency compressor when the update flag bit is detected and the first start-up cycle and the second start-up cycle are adjacent start-up cycles during the start-up operation; and update the preferred speed according to the first start-up cycle and delete the update flag bit when the update flag bit is detected and the first start-up cycle and the second start-up cycle are not adjacent start-up cycles during the start-up operation. Through the above refrigerator, the speed adaptability and long-term operation performance of the refrigerator can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, 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 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 problems 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:

[0007] a variable frequency compressor configured to adjust the running speed of the variable frequency compressor in response to a control instruction of a controller;

[0008] a controller configured to:

[0009] 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;

[0010] if the first time duration is greater than a first preset time duration, the update flag is generated;

[0011] adjusting the optimal speed of the variable frequency compressor to the highest speed until the refrigerator meets the preset gear stop requirement and enters the standby state;

[0012] 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.

[0013] The second operating duration of the variable frequency compressor is counted when the variable frequency compressor is started to operate.

[0014] The operating rotating speed of the variable frequency compressor is controlled according to the second operating duration until the refrigerator meets the gear stop requirement and enters the standby state.

[0015] 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.

[0016] 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.

[0017] The operating 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.

[0018] 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.Further, the controller directly takes the preferred rotation speed as a reference rotation speed for operation and adjustment, obtains a new preferred rotation speed, and can start without a high rotation speed (in related technologies, when the running time is long, the rotation speed of the variable frequency compressor is increased to a high rotation speed to meet the refrigeration demand), thereby shortening the rotation speed updating period. Further, the new preferred rotation speed is obtained and the update flag of the preferred rotation speed is deleted, so that the scenario of the update flag of the preferred rotation speed not being detected can be re-executed in the subsequent start-up period. Further, through the above hierarchical start-up rate adaptive adjustment and start-up period adaptive control logic, the rotation speed adaptability and long-term running performance of the ring temperature sensor-free refrigerator can be comprehensively improved.

[0019] In a second aspect, a control method of a refrigerator is provided, which is applied to the refrigerator of the first aspect. The refrigerator comprises a variable frequency compressor configured to adjust a running rotation speed of the variable frequency compressor in response to a control instruction of a controller. The control method of the refrigerator comprises the following steps.

[0020] For any start-up period of the variable frequency compressor other than the first time of power-on, if the update flag of the preferred rotation speed is not detected when the variable frequency compressor is running, the first time length of the variable frequency compressor running at the preferred rotation speed is counted. The start-up period 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 rotation speed in the next start-up period.

[0021] If the first time length is greater than a first preset time length, the update flag is generated.

[0022] The preferred rotation speed of the variable frequency compressor is adjusted to the highest rotation speed for running until the refrigerator meets the preset gear stop requirement and enters the standby state.

[0023] When the variable frequency compressor is running, if the update flag of the preferred rotation 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 run at the preferred rotation speed. The first start-up period is the start-up period in which the variable frequency compressor is currently running.

[0024] The second running time length of the variable frequency compressor running is counted.

[0025] The running rotation speed of the variable frequency compressor is controlled according to the second running time length until the refrigerator meets the gear stop requirement and enters the standby state.

[0026] When the variable frequency compressor is running, if the update flag of the preferred rotation 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 run at the preferred rotation speed.

[0027] The first start-up rate 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.

[0028] According to the first start-up probability control, the running speed of the variable frequency compressor is controlled, and in the case of obtaining a new optimal speed, the optimal speed is updated, and the update flag bit is deleted.

[0029] In a third aspect, a computer-readable storage medium is provided, and the computer-readable storage medium stores a computer program. When the computer program is run by a refrigerator, the refrigerator performs the control method of the refrigerator in the second aspect.

[0030] In a fourth aspect, a computer program product is provided, and the computer program product includes a computer program. When the computer program is run by a refrigerator, the refrigerator performs the control method of the refrigerator in the second aspect.

[0031] It can be understood that the beneficial effects of the second aspect to the fourth aspect described above can be referred to the related description in the first aspect described above, and will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a timing interaction diagram of a control method of a refrigerator in an embodiment of the present application;

[0033] Figure 2 is an application scenario diagram of adjusting the speed of a variable frequency compressor in any start-up cycle other than the first power-on in the related art;

[0034] Figure 3 is an application scenario diagram of adjusting the speed of a variable frequency compressor in a control method of a refrigerator provided in an embodiment of the present application;

[0035] Figure 4 is a schematic diagram of an implementation of adjusting the speed of a variable frequency compressor in a control method of a refrigerator provided in an embodiment of the present application;

[0036] Figure 5 is a schematic diagram of an implementation of determining a new optimal speed in a control method of a refrigerator provided in an embodiment of the present application;

[0037] Figure 6 is a schematic diagram of an implementation of adjusting the speed of a variable frequency compressor in a control method of a refrigerator provided in another embodiment of the present application;

[0038] Figure 7 is a schematic diagram of an implementation of adjusting the speed of a variable frequency compressor in a control method of a refrigerator provided in another embodiment of the present application;

[0039] Figure 8 is a schematic diagram of an implementation of updating the optimal speed in a control method of a refrigerator provided in an embodiment of the present application;

[0040] Figure 9is a schematic diagram of an application scenario of adjusting the rotating speed of a variable frequency compressor in a first power-on in the related art;

[0041] Figure 10 is a schematic diagram of an implementation of adjusting the rotating speed of a variable frequency compressor in a first power-on running in a control method of a refrigerator in an embodiment of the present application;

[0042] Figure 11 is a schematic diagram of an application scenario of adjusting the rotating speed of a variable frequency compressor in a first power-on running in a control method of a refrigerator in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise specified, " / " represents the meaning of or, for example, A / B can represent A or B; in this document, "and / or" only describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0044] Hereinafter, the terms "first", "second", "third" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more features.

[0045] For the purpose of illustration and not for limitation, specific details such as specific system structures, technologies, etc. are presented in order to thoroughly understand the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details that hinder the description of the present application.

[0046] In the current refrigerator field, mechanical variable frequency refrigerators without temperature sensors can greatly reduce production and manufacturing costs while ensuring the basic functions of variable frequency operation by eliminating temperature sensors, corresponding wiring harnesses and complex control modules, and gradually become one of the mainstream options for mechanical temperature control type refrigeration products.

[0047] 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 the large load. If the start-up rate is low, the running speed is gradually reduced to achieve energy saving.

[0048] However, when facing a load mutation (such as frequent door opening and closing, adding storage of hot food) that requires strong cooling demand, gradually adjusting the speed from the fixed preset running speed will make the variable frequency compressor have a long speed updating period and a lagging cooling response, and the energy is wasted due to invalid speed operation.

[0049] Therefore, in order to improve the speed adaptability and long-term running performance of the refrigerator without a ring temperature sensor, please refer to Figure 1 , Figure 1 is a time sequence interaction diagram of a refrigerator control method in an embodiment of the present application, as shown in Figure 1 The variable frequency compressor is configured to adjust the running speed of the variable frequency compressor in response to the control instruction of the controller. The controller is configured to perform the following steps:

[0050] S101, 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 bit of the optimal speed is not detected, the first time length of the variable frequency compressor running at the optimal speed is counted.

[0051] The start-up period includes the running time and standby time of the variable frequency compressor. The update flag bit is used to indicate that the controller updates the optimal speed in the next start-up period.

[0052] In an embodiment, the first power-on mentioned above refers to the initial running state of the first power-on after the refrigerator is powered off, at which time the control panel completes system initialization and the variable frequency compressor starts from a complete stop state, which is distinguished from the non-first power-on (running after the variable frequency compressor is in standby). The non-first power-on defined in this step focuses on the control logic of the variable frequency compressor in the normal start-up and standby cycle.

[0053] The start-up period mentioned above refers to the complete running cycle of the variable frequency compressor from the start-up running to the next start-up running, which is the basic control unit of the refrigerator refrigeration system and includes two consecutive stages: the start-up running stage of the variable frequency compressor and the standby stage of the variable frequency compressor. The time length of a complete start-up period is the sum of the start-up running time and the standby time.

[0054] The preferred rotating speed is the optimal variable frequency compressor rotating speed adapted to the current working condition determined by dynamic iteration and verified by stable operation of the refrigerator, and is not a fixed preset rotating speed, but a dynamic rotating speed taking into account the refrigeration effect and the energy saving goal, which can be iteratively updated according to the load change (such as opening and closing the door, adding food).

[0055] The update flag is an internal identification signal of the controller, which is used to mark whether the preferred rotating speed needs to be updated in the next start-up period. When the update flag is generated, it indicates that the current preferred rotating speed cannot meet the refrigeration demand after the load mutation, and needs to be adjusted again. When the update flag is deleted, it indicates that the preferred rotating speed has been updated, and the new preferred rotating speed can be directly used in the next start-up period.

[0056] The update flag can be a number (for example, 0 or 1) or a letter, which is not limited.

[0057] The first duration refers to the cumulative time of the variable frequency compressor continuously running at the current preferred rotating speed, which can be determined by the controller in the case where the update flag is not detected. Whether the refrigeration demand is enhanced or the load is mutated can be determined. The first duration can directly determine whether to trigger the preferred rotating speed update process.

[0058] The start-up running time is the actual working refrigeration time of the variable frequency compressor in a start-up period after the variable frequency compressor is started, until the refrigerator reaches the set temperature control gear stop condition, and the variable frequency compressor stops running. The standby time is the time from when the variable frequency compressor stops running to when the refrigerator enters the standby state, until the temperature in the refrigerator rises to meet the variable frequency compressor start condition, and the variable frequency compressor starts again. There is no refrigeration action in this stage.

[0059] It should be noted that for any non-first power-on start-up period of the variable frequency compressor, the controller first detects whether there is an update flag. If the update flag is not detected, it indicates that the preferred rotating speed in the last start-up period can meet the refrigeration demand, and there is no need to update immediately. Therefore, the variable frequency compressor can continue to run at the preferred rotating speed, and the first duration of running can be counted synchronously to detect whether the refrigerator has a load mutation (such as frequent opening and closing of the door, adding hot food) through the first duration, and then trigger the subsequent update flag process, which can ensure stable and energy-saving operation under normal working conditions, and quickly respond to load mutation to avoid refrigeration response lag.

[0060] S102, if the first duration is greater than the first preset duration, an update flag is generated.

[0061] In an embodiment, the first preset duration can be set according to actual conditions, which is not limited. For example, the first preset duration can be 60 minutes.

[0062] It can be understood that the first duration is greater than the first preset duration, indicating that the refrigerator is currently in a load mutation state, the refrigeration demand is greatly enhanced, and the current preferred rotation speed cannot meet the cooling demand. At this time, the controller generates an update flag to mark that the current preferred rotation speed is invalid, indicating that the controller needs to re-adjust and update the preferred rotation speed in the next start-up cycle, providing a trigger basis for subsequent rotation speed adjustment process adapting to new load.

[0063] It should be noted that when the first duration is less than or equal to the first preset duration, it can be considered that in the current start-up cycle, the refrigerator does not occur load mutation, and the preferred rotation speed can meet the refrigeration demand. Further, the update flag can not be generated. At this time, in the next start-up cycle, the above S101 step will still be executed.

[0064] S103, adjusting the preferred rotation speed of the variable frequency compressor to the highest rotation speed to run until the refrigerator meets the preset gear stop requirement and enters the standby state.

[0065] In an embodiment, the highest rotation speed refers to the maximum running rotation speed allowed by the hardware design of the variable frequency compressor, which is the upper limit of the refrigeration capacity of the variable frequency compressor. At the highest rotation speed, the refrigeration efficiency and refrigeration capacity of the variable frequency compressor reach the peak value, and the temperature in the refrigerator can be reduced at the fastest speed, which is the limit rotation speed for coping with the forced refrigeration demand of load mutation (such as frequent opening and closing of the door, addition of hot food).

[0066] The gear stop requirement can be a stop temperature condition corresponding to a temperature control gear set in advance on the refrigerator, or a running time condition (when the running time is equal to the preset running time, it is determined that the gear stop requirement is met, and different temperature control gears correspond to different preset running times), which is not limited.

[0067] For example, different gears correspond to different target stop temperatures (such as 4℃ stop for the refrigeration gear and -18℃ stop for the freezing gear), and when the temperature in the refrigerator drops to the target temperature set by the gear, the gear stop requirement is met.

[0068] The above standby state refers to a state in which the variable frequency compressor stops running and the whole machine enters a low-power waiting state. At this time, the variable frequency compressor has no refrigeration action, and only the refrigerator temperature control system monitors the temperature in the box in real time. When the temperature rises to the variable frequency compressor start threshold, the variable frequency compressor will be started again, which is a normal pause stage of the refrigerator refrigeration cycle.

[0069] It should be noted that, in the case where the current preferred rotation speed cannot meet the enhanced refrigeration demand, the controller directly adjusts the variable frequency compressor rotation speed to the highest rotation speed, which can quickly reduce the temperature by using the peak refrigeration capacity of the highest rotation speed until the temperature in the refrigerator reaches the stop temperature corresponding to the user set level, and after the level stop requirement is met, the variable frequency compressor stops running and enters the standby state. Further, not only does it quickly solve the refrigeration lag problem after load mutation, but it also stops running and enters standby mode in a timely manner after completing the refrigeration target, avoiding unnecessary high-speed energy waste.

[0070] In another embodiment, with reference to Figure 2 , Figure 2 is a schematic diagram of an application scenario for adjusting the rotation speed of a variable frequency compressor in any power-on period other than the first power-on in the related art. Wherein, Figure 2 The horizontal axis of the graph is the test time (minutes), which records the entire cycle from stable operation, load mutation to completion of rotation speed adjustment of the refrigerator; the left vertical axis is the temperature in the box (℃), which directly reflects the temperature fluctuation in the refrigerator, and the right vertical axis is the power of the variable frequency compressor (W), which is positively correlated with the rotation speed of the variable frequency compressor, and can indirectly reflect the high and low rotation speed of the variable frequency compressor. The curve marked by the number 1 is the power curve, which indirectly reflects the change of the rotation speed; the curve marked by the number 2 is the temperature in the refrigerator, which directly presents the temperature fluctuation and the cooling process after the load mutation; the dot marked by the number 3 corresponds to the moment of simulating the input of hot food, at which time the temperature in the box rises suddenly, triggering the forced cooling demand.

[0071] At the moment of load mutation of the refrigerator, the related art detects the forced cooling demand, and usually uses a control logic of gradually increasing the frequency by a small amplitude. After multiple small amplitude frequency adjustments, if the rotation speed of the variable frequency compressor (curve 1) is not increased to the highest rotation speed to output the maximum refrigeration capacity for cooling, the temperature in the refrigerator (curve 2) will not drop to the stop temperature. After the temperature in the refrigerator drops to the stop temperature, the variable frequency compressor is slowly and gradually reduced in frequency from the highest rotation speed, and gradually adjusted to a low rotation speed that adapts to the new working condition.

[0072] However, the above control method has the following defects: first, the forced cooling response is lagging, and the gradual frequency increase causes the variable frequency compressor to be unable to quickly output large refrigeration capacity, the temperature in the box rises sharply, the cooling period is long, and the food cannot be frozen in time; second, the additional energy consumption is serious, and the process of gradually reducing the frequency from the highest rotation speed to the new energy-saving rotation speed prolongs the adjustment period in a large number of invalid rotation speed operation stages, resulting in a large increase in the load power consumption (the energy consumption increment of the user); third, the rotation speed adjustment efficiency is low, and the gradual adjustment logic depends on the running time, the optimal rotation speed under the new load has a long iteration period, and the stable rotation speed that adapts to the working condition cannot be quickly locked, which weakens the energy-saving advantage of the variable frequency compressor.

[0073] In the embodiment, the preferred rotation speed of the variable frequency compressor is directly adjusted to the highest rotation speed operation, so that the rapid refrigeration demand of the refrigerator can be met. Specifically, referring to Figure 3 , Figure 3 is a schematic diagram of an application scenario for adjusting the rotation speed of a variable frequency compressor in a control method of a refrigerator according to an embodiment of the present application. Figure 3 The horizontal axis in the diagram is the test time (minute), and the left side of the vertical axis is the temperature in the box (℃), and the right side is the rotation speed (RPM) of the variable frequency compressor. The curve marked by the number 1 is a power curve that indirectly reflects the rotation speed of the variable frequency compressor, which can show the up and down adjustment process of the rotation speed of the variable frequency compressor. The curve marked by the number 2 is a temperature curve in the box, which reflects the fluctuation and cooling trend of the internal temperature of the refrigerator after the load mutation. The point marked by the number 3 is the moment of load mutation when the simulated hot food is put in, which is the node that triggers the forced cooling demand and the rotation speed adjustment.

[0074] Based on the point marked by the number 3, before the moment of load mutation, the variable frequency compressor is stably in a low rotation speed energy-saving operation state. The rotation speed has been accumulated and stably operated and is marked as the preferred rotation speed. The temperature in the box fluctuates smoothly, and is in a stable refrigeration stage with high efficiency and energy saving. After the load is put in, the controller quickly identifies the forced cooling demand, and the rotation speed curve corresponding to the number 1 directly increases to a higher rotation speed, so as to output a large refrigeration capacity, drive the temperature in the box corresponding to the curve of the number 2 to quickly fall, and complete the rapid refrigeration and enter the standby state. In this way, not only the demand of the user for rapid refrigeration can be met, but also the additional power consumption caused by invalid adjustment can be avoided, so as to realize the bidirectional improvement of the refrigeration response speed and the energy saving effect.

[0075] In S104, when the variable frequency compressor is in operation, if the update flag bit of the preferred rotation speed is detected, and the first start-up period and the second start-up period in which the update flag bit is generated are adjacent start-up periods, the variable frequency compressor is controlled to operate at the preferred rotation speed.

[0076] The first start-up period is the start-up period in which the variable frequency compressor is currently in operation.

[0077] In an embodiment, the first start-up period refers to the period in which the variable frequency compressor is currently performing the start-up operation, which is a complete control cycle containing the current start-up operation time and the subsequent standby time of the variable frequency compressor, that is, the current start-up period is occurring.

[0078] On the contrary, the second start-up period refers to the last start-up period in which the update flag bit is generated, which is the adjacent period before the first start-up period. In the second start-up period, the controller determines that the original preferred rotation speed cannot meet the refrigeration demand, so as to generate the update flag bit, which is used to indicate that the preferred rotation speed needs to be updated in the next period (i.e., the first start-up period).

[0079] It can be understood that when the controller detects the update flag in the current first start-up period, and the update flag is generated by the adjacent last second start-up period, it can be considered that the second start-up period has determined that the original preferred rotation speed does not match the forced cooling demand, but the accurate update of the preferred rotation speed needs to rely on accurate operation data (such as the start-up rate). Therefore, the controller can first control the variable frequency compressor to operate at the original preferred rotation speed, on the one hand to maintain the basic refrigeration capacity and avoid the temperature in the box out of control, and on the other hand to count the second operation time length of the variable frequency compressor in the period, to provide data support for subsequent adjustment of the new preferred rotation speed based on the start-up rate, to ensure the accuracy of the subsequent rotation speed update, and to avoid blind adjustment.

[0080] S105, count the second operation time length of the variable frequency compressor in the start-up operation.

[0081] S106, control the operation rotation speed of the variable frequency compressor according to the second operation time length, until the refrigerator meets the gear stop requirement and enters the standby state.

[0082] In an embodiment, the second operation time length refers to the cumulative time of the actual start-up operation of the variable frequency compressor in the current first start-up period counted by the controller. Referring to Figure 3 , a complete start-up period is composed of an operation time length and a standby time length: the operation time length can correspond to the peak period (for example, the time length from time a to time b) of the digital curve 1 in the figure, that is, the time period during which the variable frequency compressor is started and outputs refrigeration capacity; the standby time length corresponds to the smooth low period (the flat interval between the peaks, for example, the time length from time b to time c) of the red curve, that is, the time period during which the refrigerator enters the standby state and the temperature in the box slowly rises, and the sum of the two time lengths is the total time length of a complete start-up period.

[0083] It should be noted that in the current first start-up period, the variable frequency compressor operates at the original preferred rotation speed, and the controller accumulates the second operation time length of the start-up operation in real time, to determine whether the current operation rotation speed can efficiently meet the refrigeration demand through the time length. Subsequently, the control of the rotation speed according to the second operation time length can dynamically adjust the rotation speed of the variable frequency compressor based on the counted second operation time length (for example, the time length is too long, then the rotation speed is slightly increased to enhance the refrigeration, and the time length is moderate, then the rotation speed is maintained or slightly adjusted), to gradually reduce the temperature in the box to the gear stop requirement, and to complete the refrigeration and then stop the variable frequency compressor to enter the standby state. This process not only guarantees the continuity of the basic refrigeration after the load mutation, but also lays a foundation for subsequent iteration of the new preferred rotation speed based on the start-up rate by using accurate operation time length data, to avoid energy waste caused by invalid rotation speed adjustment, and to shorten the adaptation period of the new preferred rotation speed.

[0084] S107, when the variable frequency compressor is started and operated, if the update flag of the preferred rotation speed is detected, and the first start-up period and the second start-up period are not adjacent start-up periods, then the variable frequency compressor is controlled to operate at the preferred rotation speed.

[0085] In an embodiment, the second start-up period (i.e., the historical period triggering the preferred rotation speed update) which does not generate the update flag bit for the adjacent start-up period, and the currently running first start-up period, are separated by at least one complete start-up period, and are not immediately adjacent to each other.

[0086] For example, if the second start-up period is the Nth start-up period, and the first start-up period is the N+2th period, and the N+1th period is in between, then the two are not adjacent to each other, unlike the adjacent start-up periods (for example, the second start-up period is the Nth, and the first start-up period is the N+1th, without any interval).

[0087] It should be noted that when the controller detects the update flag bit in the current first start-up period, but the update flag bit comes from an earlier, non-adjacent second start-up period, it indicates that the load mutation scenario (such as the hot load being put in) triggered by the update flag bit has passed at least one start-up period, and new working condition data has been generated in between. The old load demand corresponding to the original update flag bit may have changed. At this time, the controller first controls the variable frequency compressor to run at the original preferred rotation speed, with the purpose of maintaining the basic refrigeration capacity and avoiding the loss of control of the temperature in the box due to direct and blind adjustment of the rotation speed; and collecting the actual running data (such as the running time and the subsequent start-up rate) of the current first start-up period, based on the current latest working condition rather than the outdated old load scenario, to provide a basis for subsequent precise adjustment of the new preferred rotation speed, to ensure that the rotation speed update adapts to the current real refrigeration demand, and to avoid invalid adjustment and energy waste.

[0088] S108, acquiring a first start-up rate of a third start-up period.

[0089] The third start-up period is the previous start-up period of the first start-up period. Specifically, the third start-up period refers to the previous complete start-up period of the currently running first start-up period, i.e., the complete cycle immediately before the first start-up period, in which the variable frequency compressor is running and then in standby, and is the period closest to the current working condition, from which the latest running data can be obtained, and is distinguished from the earlier second start-up period which generates the update flag bit.

[0090] The above-mentioned first start-up rate refers to the ratio of the running time of the variable frequency compressor in the third start-up period to the total time of the period (running time + standby time), which is an index quantifying the refrigeration load of the refrigerator in the third period. The higher the first start-up rate, the stronger the refrigeration demand and the larger the load in the third start-up period; the lower the first start-up rate, the weaker the refrigeration demand and the smaller the load, providing a load reference for the preferred rotation speed adjustment.

[0091] It can be understood that when the controller detects that the update flag bit and the first start-up period and the second start-up period are not adjacent, the second start-up period in which the update flag bit is generated is outdated, and the corresponding old load demand can have changed. Therefore, the controller obtains the first start-up rate of the latest last start-up period (third start-up period), accurately quantifies the current real refrigeration load through the first start-up rate, replaces the old load data, provides a reliable basis for subsequent adjustment of the optimal speed that adapts to the new working condition, and avoids refrigeration response lag or invalid energy consumption caused by blind adjustment.

[0092] In S109, the running speed of the variable frequency compressor is controlled according to the first start-up rate, and in the case where a new optimal speed is obtained, the optimal speed is updated, and the update flag bit is deleted.

[0093] In an embodiment, the first start-up rate is the ratio of the running time of the variable frequency compressor to the total time of the third start-up period (last start-up period), which directly reflects the refrigeration load strength of the last start-up period. At this time, if the first start-up rate is high, it indicates that the running time of the variable frequency compressor accounts for a large proportion in the last start-up period, the refrigeration demand is strong, and the load is large. The controller can increase the running speed of the variable frequency compressor to enhance the refrigeration capacity and match the current strong refrigeration demand. If the first start-up rate is low, it indicates that the running time of the variable frequency compressor accounts for a small proportion in the last start-up period, the refrigeration demand is weak, and the load is small. The controller can reduce the running speed of the variable frequency compressor to reduce unnecessary energy consumption and return to an energy-saving running state.

[0094] As an example, in the process of adjusting the speed according to the start-up rate, the controller can continuously monitor the running state of the variable frequency compressor. When a certain running speed after adjustment can stably meet the refrigeration demand of the current working condition (such as small temperature fluctuation in the box, stable running time of the variable frequency compressor, and no frequent start-stop), and takes into account the energy-saving goal (the speed is not too high to avoid energy waste, and not too low to avoid frequent operation), and reaches the preset stable running condition (such as maintaining the speed for a plurality of consecutive periods, and the cumulative stable running time meets the standard), the speed is confirmed as the new optimal speed. That is, the new optimal speed is the optimal speed that adapts to the current latest load, replacing the original old optimal speed.

[0095] It should be noted that the controller first dynamically adjusts the speed of the variable frequency compressor based on the latest first start-up rate, and in the adjustment process, a new optimal speed that adapts to the current working condition is selected and confirmed. Then, the original optimal speed is updated to this new optimal speed, and the update flag bit is deleted, indicating that the current optimal speed update process is completely completed. This process not only accurately matches the variable frequency compressor speed to the current real refrigeration demand, avoiding energy waste and refrigeration lag caused by blind adjustment, but also returns the refrigerator to the normal stable energy-saving running state based on the new optimal speed, completing the complete control loop of load identification, speed adjustment, and optimal speed iteration.

[0096] In another embodiment, the update flag bit needs to be kept when the new preferred rotation speed is not obtained. At this time, the update flag bit of the preferred rotation speed will still be detected when entering the next start-up period.

[0097] As an example, taking the 5th period as the second start-up period N=5, the refrigerator triggers a load mutation due to the input of hot food, and the original preferred rotation speed a cannot meet the refrigeration demand. The controller generates an update flag bit to mark "the preferred rotation speed needs to be updated".

[0098] In the 6th period (N+1=6), at this time, the first start-up period is the 6th period, which is adjacent to the 5th period. At this time, the controller will detect the update flag bit of the preferred rotation speed, but the controller does not need to perform the preferred rotation speed update, only maintains the running rotation speed control of the variable frequency compressor for regular refrigeration, and keeps the update flag bit.

[0099] However, in the 7th period (N+2=7), at this time, the first start-up period is the 7th period, which is not adjacent to the 5th period (N=5) (interval of the 6th period). At this time, the original preferred rotation speed is started to run in the non-adjacent start-up period. When the variable frequency compressor is started in the 7th period (the current first start-up period), the controller detects the update flag bit, and the 7th period is not adjacent to the 5th period (the second start-up period), so the variable frequency compressor is controlled to run at the original preferred rotation speed a to maintain the basic refrigeration capacity, and to prepare for the subsequent collection of the latest working condition data.

[0100] At the same time, the last period of the 7th period is the 6th period (i.e., the third start-up period), and the controller can calculate the first start-up rate of the 6th period.

[0101] At this time, in the 7th period, the controller can first control the rotation speed of the variable frequency compressor based on the first start-up rate (for example, from the preferred rotation speed a to the running rotation speed a1). If the running rotation speed a1 in the 7th period is determined to be the new preferred rotation speed, the preferred rotation speed can be updated and the update flag bit can be deleted. Otherwise, when the running rotation speed a1 in the 7th period is not determined to be the new preferred rotation speed, the update flag bit will still exist until the new first start-up period (the 8th period, the new first start-up period N+3=8) is entered.

[0102] In the 8th cycle, the controller still detects the update flag, and the 8th cycle is still not adjacent to the 5th cycle (the second start-up cycle) (with the 6th and 7th cycles in between). The controller will continue to control the variable frequency compressor to run at the preferred rotation speed a, and again acquire the first start-up probability of the last cycle (the 7th cycle, the new third start-up cycle) of the 8th cycle, and again adjust the running rotation speed to a2. At this time, it will be re-determined whether the running rotation speed a2 is the new preferred rotation speed. When it is determined that a2 is the new preferred rotation speed, the original preferred rotation speed a will be updated to a2, and the update flag will be deleted, and the entire iterative update process of the preferred rotation speed will be completed. Otherwise, the above steps S107-S109 will be executed again.

[0103] In the embodiment, for any start-up period of the variable frequency compressor after the first power-on, since the update flag is used to indicate that the controller updates the preferred rotation speed in the next start-up period, if the update flag of the preferred rotation speed is not detected, it indicates that the variable frequency compressor can meet the refrigeration demand when running at the preferred rotation speed in the last start-up period, and thus there is no need to update the preferred rotation speed in the current start-up period. Alternatively, the controller updates the preferred rotation speed again in the last start-up period, and there is also no need to update the preferred rotation speed at this time. Based on this, the controller can control the variable frequency compressor to run at the preferred rotation speed and count the first duration of running. The start-up period includes the 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, or newly stored hot food), which causes the refrigeration demand to increase. At this time, running at the preferred rotation speed for the first preset duration will still not be able to meet the refrigeration demand. Based on this, it can be considered that the preferred rotation speed does not meet the requirements, and thus the above-mentioned update flag can be generated to re-generate the preferred rotation speed that matches the load mutation. In order to quickly meet the refrigeration demand, the preferred rotation speed of the variable frequency compressor can be adjusted to the highest rotation speed at the same time, 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 rotation 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 rotation 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 rotation 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 rotation speed and count the second running duration of the variable frequency compressor, and control the running rotation 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, thereby providing a reference start-up rate for quickly adjusting a new energy-saving running rotation speed (a new preferred rotation speed). When the variable frequency compressor is running, if the update flag of the preferred rotation speed is detected, it can be considered that the controller needs to update the preferred rotation speed. 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 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 rotation speed. Finally, when the new preferred rotation speed is not obtained, the controller can first control the variable frequency compressor to run at the original preferred rotation speed, control the running rotation speed of the variable frequency compressor based on the first start-up rate, and update the original preferred rotation speed when a new preferred rotation speed is obtained during the running of the variable frequency compressor, and delete the update flag. Thus, the controller directly uses the preferred rotation speed as the reference rotation speed for running and adjusting, and obtains a new preferred rotation speed, which can not need to start from a high rotation speed, thereby shortening the rotation speed update period.And, obtaining the new preferred rotation speed and deleting the update flag, the scenario of the update flag of the preferred rotation speed not being detected can be re-executed in the subsequent start-up period. Furthermore, through the above-mentioned hierarchical start-up rate adaptive adjustment, start-up period adaptive control and other logics, the rotation speed adaptability and long-term running performance of the no-loop temperature sensor refrigerator can be comprehensively improved.

[0104] In another embodiment, the controller can also control the running speed of the variable frequency compressor according to the S401-S402 steps as shown. Figure 4 The details are as follows:

[0105] 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 highest speed, the current running speed of the variable frequency compressor is added to the first preset speed to obtain a new current running speed.

[0106] In an embodiment, the second preset time is a time threshold value preset by the controller for judging the refrigeration adaptability of the current variable frequency compressor running speed. For example, the above-mentioned second preset time can be 60 min.

[0107] In the scenario of the adjacent start-up period, if the second running time of the variable frequency compressor running at the original preferred speed exceeds the threshold value, it indicates that the refrigeration capacity of the current running speed is insufficient to quickly meet the refrigeration demand, and the refrigeration efficiency needs to be enhanced by increasing the frequency.

[0108] It should be noted that if the current running speed of the variable frequency compressor is less than the preset highest speed, it indicates that there is still room for increasing the running speed, and the refrigeration capacity can be enhanced by increasing the running speed. When the above-mentioned two conditions are met, the controller can increase the current running speed of the variable frequency compressor by the first preset speed, gradually enhance the refrigeration capacity, avoid the waste of energy caused by directly increasing to the highest speed, quickly improve the refrigeration efficiency, and provide accurate data support for subsequent iteration of the new preferred rotation speed.

[0109] 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 highest speed, the variable frequency compressor is controlled to maintain the current running speed.

[0110] In an embodiment, when the second running time is less than or equal to the second preset time, it indicates that the refrigeration capacity of the current running speed can match the refrigeration demand, and the cooling efficiency meets the standard, and there is no need to increase the frequency. And, when the current running speed of the variable frequency compressor is the highest speed, it indicates that the upper limit of the rotation speed has been reached, and there is no room for increasing the frequency, and only the running can be maintained.

[0111] In an embodiment, the above steps serve to stabilize the collection of real operation data at the current operation speed, ensure the accuracy of the second operation time length statistics by maintaining the speed, provide reliable basis for subsequent calculation of the reference start-up rate and iteration of the new energy-saving preferred speed, and avoid distortion of the working condition data caused by arbitrary adjustment of the speed.

[0112] It should be noted that when 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, the purpose of controlling the operation speed through the above steps S401-S402 is not to quickly cool, but to collect accurate reference start-up rate for iteration of the new energy-saving preferred speed. If the second operation time length is directly increased to the highest speed when the second operation time length is greater than the second preset time length, the actual operation time length of the variable frequency compressor will be greatly shortened, resulting in that the operation time length cannot accurately reflect the real load. Further, the start-up rate calculated based on the distorted time length will also deviate from the actual working condition, and finally the energy-saving preferred speed adapted to the long-term working condition cannot be iterated.

[0113] At this time, when the second start-up period in which the update flag is generated is adjacent to the first start-up period, the first preset speed is increased by a small amount, which can not only gradually verify the speed adaptability and correct the refrigeration efficiency, but also ensure the effectiveness of the operation time length data and the accuracy of the subsequent reference start-up rate.

[0114] In the present embodiment, when the second operation time length is greater than the second preset time length and has not reached the highest speed, the frequency is increased by a small amount, the refrigeration adaptability is gradually verified and optimized, and the operation data is ensured to be effective. When the second operation time length is less than or equal to the second preset time length, and / or the current operation speed of the variable frequency compressor is equal to the highest speed, the speed is kept stable, the accuracy of the second operation time length and the subsequent reference start-up rate is ensured, reliable data support is provided for iteration of the new energy-saving preferred speed adapted to the long-term working condition, the distortion of the working condition data caused by direct frequency increase is avoided, and the energy waste caused by invalid speed adjustment is reduced.

[0115] In another embodiment, the controller can also control the operation speed of the variable frequency compressor according to the steps S501-S505 as shown in Figure 5 The details are as follows:

[0116] S501, determining the target operation speed according to the first start-up rate.

[0117] S502, adjusting the operation speed of the variable frequency compressor to the target operation speed.

[0118] In an embodiment, the target running speed can be a speed obtained by adjusting the current running speed by the controller. For example, the controller can be pre-provided with a plurality of start-up rate intervals, and a speed adjustment value for each start-up rate interval. Then, the speed adjustment value corresponding to the first start-up rate is determined and superimposed with the current running speed to obtain the target running speed.

[0119] In an embodiment, the controller can generate a control instruction of the target running speed and send it to the variable frequency compressor to instruct the variable frequency compressor to adjust the running speed to the target running speed.

[0120] S503, statistics the cumulative duration of the variable frequency compressor running at the target running speed in multiple start-up cycles.

[0121] S504, if the cumulative duration is greater than or equal to a third preset duration, the target running speed is determined as a new preferred speed.

[0122] S505, if the cumulative duration is less than the third preset duration, the target running speed is not determined as a new preferred speed.

[0123] In an embodiment, the cumulative duration refers to the actual start-up running time of the variable frequency compressor at the target running speed (temporary running speed calculated based on the first start-up rate) in multiple start-up cycles, which is counted and accumulated by the controller after generating the update flag and completing the first start-up rate calculation. The cumulative duration is the sum of the running durations of the target running speed in all start-up cycles participating in the statistics, which is used to verify whether the target running speed can make the variable frequency compressor run stably.

[0124] The third preset duration is a fixed time threshold (for example, 12h) built in the controller, which is used as a standard to determine whether the target running speed can be upgraded to a new preferred speed.

[0125] It should be noted that a single start-up cycle is usually less than the third preset duration, and the target running speed determined by a single start-up cycle cannot reflect the long-term real load of the refrigerator.

[0126] It should be noted that when the cumulative duration corresponding to the target running speed is less than the third preset duration, it proves that the target running speed fails the long-term stability verification and does not have the condition to be upgraded to a preferred speed. At this time, the controller can execute the loop iteration control logic.

[0127] For example, in the current first start-up cycle, the variable frequency compressor can run at the current target running speed until it meets the refrigerator gear stop requirement and stops running, entering the normal standby state. In the next start-up cycle, the variable frequency compressor starts again, and since the update flag is not deleted, the controller will re-execute the entire set of judgment procedures, obtain the latest first start-up rate in the previous start-up cycle, and re-calculate to generate a new target running speed. Then, the controller can drive the variable frequency compressor to run at the new target running speed, and independently count the running time of the new target running speed. Moreover, if the new target running speed is the same as the target running speed in the previous start-up cycle, the second running time of each first start-up cycle running at the same target running speed can be accumulated to obtain the corresponding cumulative time, and then compared with the third preset time again. Finally, the above iteration, statistics, and judgment procedures are repeatedly performed until the cumulative time corresponding to a target running speed meets the condition of ≥ the third preset time, which is determined as the new optimal speed, the update flag is deleted, and the iteration process is exited, returning to the normal energy-saving running mode.

[0128] In the present embodiment, by determining the target running speed based on the first start-up rate, adjusting the variable frequency compressor to run at the target running speed, and counting the cumulative time in multiple start-up cycles. Then, taking the third preset time as the judgment threshold, when the cumulative time is less than the third preset time, the target running speed is not determined as the new optimal speed, and only when the cumulative time is greater than or equal to the third preset time, the target running speed is determined as the new optimal speed. Furthermore, not only does it ensure that the speed adjustment fits the latest refrigeration load working condition, but it also excludes temporary working condition interference through multi-cycle accumulation verification, ensuring that the new optimal speed has long-term stability and adaptability, efficiently balancing refrigeration demand and energy-saving goals, while avoiding setting temporary adaptation and poor stability speed as the optimal speed.

[0129] In another embodiment, the controller can also control the running speed of the variable frequency compressor according to the first start-up rate according to the S601-S605 steps as shown in Figure 6 The details are as follows:

[0130] S601, if the first start-up rate is between the preset second start-up rate and the third start-up rate, the optimal speed is determined as the target running speed.

[0131] In an embodiment, the second start-up rate and the third start-up rate are respectively two preset start-up rate thresholds, used to divide the refrigeration load level, the second start-up rate is the low load threshold, the third start-up rate is the high load threshold, and the interval relationship between the first start-up rate and the two corresponds to different speed adjustment strategies.

[0132] S602, if the first starting probability is less than the second starting probability, and the stop rotation speed of the variable frequency compressor in the third starting cycle is greater than the preset minimum rotation speed, then the target rotation speed is obtained by subtracting the second preset rotation speed from the preferred rotation speed.

[0133] S603, if the first starting probability is less than the second starting probability, and the stop rotation speed is equal to the minimum rotation speed, then the stop rotation speed is determined as the target rotation speed.

[0134] S604, if the first starting probability is greater than the third starting probability, then the target rotation speed is obtained by adding the third preset rotation speed to the preferred rotation speed.

[0135] S605, the preferred rotation speed is adjusted to the target rotation speed.

[0136] In an embodiment, the stop rotation speed is the instantaneous rotation speed of the variable frequency compressor when it stops running in the third starting cycle (the last cycle of the first starting cycle), which is a reference rotation speed reflecting the refrigeration adaptation state at the end of the last cycle. The minimum rotation speed is the minimum running rotation speed allowed by the design of the variable frequency compressor, which is the lower limit of the basic refrigeration capacity of the refrigerator. The rotation speed cannot be lower than this value to avoid insufficient refrigeration.

[0137] The second preset rotation speed is a preset fixed frequency reduction step, which is used to reduce the rotation speed by a small amount in a low load scenario to achieve energy saving optimization. The third preset rotation speed is a preset fixed frequency increase step, which is used to increase the rotation speed by a small amount in a high load scenario to enhance the refrigeration capacity.

[0138] The second preset rotation speed can be equal to, less than, or greater than the third preset rotation speed, which is not limited. For example, the third preset rotation speed is greater than the second preset rotation speed. For example, the third preset rotation speed can be 300 rpm, and the second preset rotation speed can be 150 rpm.

[0139] It should be noted that in the S602 step, after reducing the second preset rotation speed to obtain a new target running speed, if the new target running speed is less than the minimum rotation speed, the minimum rotation speed is determined as the new target running speed.

[0140] In this embodiment, by setting the third preset rotation speed for frequency increase to be greater than the second preset rotation speed for frequency reduction, differential optimization of refrigeration demand response and energy saving adjustment can be achieved. In a high load scenario, the variable frequency compressor can be quickly increased in speed with a larger step to enhance the refrigeration capacity, efficiently respond to strong refrigeration demand, and avoid refrigeration lag. In a low load scenario, the rotation speed can be accurately and gently optimized with a smaller step to gradually achieve energy saving while ensuring the basic refrigeration capacity, avoiding insufficient refrigeration due to excessive frequency reduction, and considering the stability and accuracy of rotation speed adjustment.

[0141] In an embodiment, the controller accurately determines the target running speed according to the interval relationship of the first starting probability, the second starting probability and the third starting probability in four scenarios: when the first starting probability is between the second starting probability and the third starting probability, the last shutdown speed of the last cycle is directly used as the target running speed; when the first starting probability is less than the second starting probability, if the shutdown speed is higher than the minimum speed, the preferred speed is reduced by the second preset speed, and if the shutdown speed is equal to the minimum speed, the shutdown speed is directly used; when the first starting probability is greater than the third starting probability, the preferred speed is added to the third preset speed, and the variable frequency compressor is finally adjusted to the determined target running speed. Further, the interval division of the starting probability is used to realize the accurate speed regulation in different scenarios, which not only meets the refrigeration demand of different loads, but also adjusts the speed with a fixed step and a small amplitude to avoid sharp fluctuations in the speed, and at the same time, the reference values such as the shutdown speed and the minimum speed are used to ensure the rationality of the adjustment. Further, the speed adaptation accuracy can be effectively improved, the refrigeration performance and the energy saving effect are considered, the working condition characteristics of the refrigerator without a ring temperature sensor are adapted, and the long-term operation stability is optimized.

[0142] In another embodiment, after controlling the running speed of the variable frequency compressor according to the first starting probability, the controller can further adjust the target running speed according to the steps S701-S703 as shown in FIG. 7. Figure 7 The details are as follows:

[0143] S701, determining a third running time length of the variable frequency compressor in the first starting cycle.

[0144] S702, if the third running time length is greater than a fourth preset time length, and the target running speed is less than the maximum speed, the target running speed is added to the fourth preset speed to obtain a new target running speed.

[0145] S703, 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.

[0146] In an embodiment, the third running time length is the actual starting time of the variable frequency compressor in the current first starting cycle, which is an index for judging the refrigeration adaptation of the current target running speed, and is used to evaluate whether the speed can efficiently meet the refrigeration demand in the current cycle.

[0147] The fourth preset time length is a time threshold preset by the controller, which is used to judge the refrigeration efficiency of the target running speed. If the third running time length exceeds the threshold, it indicates that the variable frequency compressor has insufficient refrigeration capacity at the target running speed in the current first starting cycle, and the refrigeration efficiency needs to be optimized by frequency increase. Illustratively, the fourth preset time length can be 60 minutes.

[0148] The fourth preset rotating speed is a preset fixed frequency increasing step, which is used to increase the target rotating speed in a small range to gradually enhance the refrigeration capacity while ensuring the stability of the rotating speed adjustment when the refrigeration efficiency is insufficient. For example, the fourth preset rotating speed can be 300 rpm.

[0149] In this embodiment, the rotating speed is accurately adjusted according to different scenes by comparing the third running time with the fourth preset time and combining the relationship between the first running rotating speed and the highest rotating speed. When the third running time is too long and the highest rotating speed is not reached, the rotating speed is increased in a small range at the fourth preset rotating speed to gradually optimize the refrigeration adaptability. When the third running time is less than or equal to the fourth preset time, and / or, the target running rotating speed is equal to the highest rotating speed, the target running rotating speed is kept stable to ensure the accuracy of the third running time, and to provide reliable data support for the subsequent iteration of the new optimal rotating speed, which avoids the distortion of the working condition data caused by directly increasing the rotating speed in a large range, and efficiently improves the refrigeration efficiency, and balances the refrigeration performance and energy saving.

[0150] As an example, for the flowchart of S107-S109 steps and the above Figures 5-7 , Figure 8 , Figure 8 is a flowchart of a refrigerator control method provided in an embodiment of the present application, which is used to describe an example of S107-S109 steps. Specifically, for the scene that the update flag of the optimal 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 run at the optimal rotating speed; then the first start-up rate of the third start-up period is obtained, and it is judged whether the first start-up rate is between the second start-up rate and the third start-up rate. If yes, the target running rotating speed is set as the lowest rotating speed; if no, it is further judged whether the first start-up rate is less than the second start-up rate; if the first start-up rate is less than the second start-up rate, it is further judged whether the stop rotating speed is greater than the lowest rotating speed; if yes, the target running rotating speed = optimal rotating speed-second preset rotating speed, if no, the target running rotating speed = lowest rotating speed; if the first start-up rate is not less than the second start-up rate, the target running rotating speed = optimal rotating speed+third preset rotating speed. After the target running rotating speed is determined, the rotating speed of the variable frequency compressor can be adjusted to the target running rotating speed. Then, the third running time of the variable frequency compressor in the first start-up period is determined, and it is judged whether the third running time is greater than the fourth preset time and the target rotating speed is less than the highest rotating speed. If yes, the new target running rotating speed = original target rotating speed+fourth preset rotating speed and returns to the step of adjusting the rotating speed of the variable frequency compressor; if no, the variable frequency compressor is controlled to run at the current target rotating speed. Finally, the cumulative time of the variable frequency compressor running at the target running rotating speed in multiple start-up periods is counted, and it is judged whether the cumulative time is ≥ third preset time; if yes, the target running rotating speed is set as the new optimal rotating speed and the update flag is deleted, if no, the update flag is kept and the above flow is continued to be executed in the next start-up period.

[0151] In another embodiment, for any start-up period 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 length when the variable frequency compressor is started. Then, after the fifth preset time length, the speed of the variable frequency compressor is adjusted to the optimal speed.

[0152] The preset oiling speed is a preset running speed designed for oil supply of the lubricating system, which is different from the conventional refrigeration running speed. The speed parameter matches the oil supply characteristics of the internal oil circuit of the variable frequency compressor, so that the lubricating oil can be quickly and efficiently delivered to the core moving friction pairs such as bearings and pistons, and the lubrication is ensured to be in place.

[0153] The fifth preset time length is a fixed time length that ensures that the variable frequency compressor completes sufficient lubrication at the preset oiling speed. The time length is set according to the structure of the variable frequency compressor, the properties of the lubricating oil, environmental conditions, etc., and can ensure that the oil circuit establishes a stable oil film and covers all friction parts. For example, the fifth preset time length can be 30s.

[0154] In this embodiment, by running at the preset oiling speed for the fifth preset time length in the start-up phase, a stable lubricating oil film can be quickly established at the initial start-up of the variable frequency compressor, avoiding dry friction or semi-dry friction caused by insufficient residual oil amount in the oil circuit and un-restored oil film at start-up, effectively reducing the wear of moving parts and prolonging the service life of the variable frequency compressor. At the same time, it ensures that the lubrication is sufficient before switching to the optimal speed for running, taking into account the lubrication protection and the efficiency and stability of subsequent refrigeration operation.

[0155] In an embodiment, the above examples are all running controls for any start-up period of the variable frequency compressor that is not the first power-on. For the start-up period of the first power-on, refer to Figure 9 , Figure 9 is a schematic diagram of an application scenario of adjusting the speed of a variable frequency compressor in the first power-on in the related art. The horizontal axis is time (minutes), covering 0-210 minutes, which records the whole temperature drawing period from starting refrigeration to temperature stabilization after the first power-on of the refrigerator. The left vertical axis is temperature (°C), ranging from -50°C to 130°C, which is used to represent the temperature change of the core refrigeration compartment of the refrigerator. The right vertical axis is power / current (power unit: W, current corresponds to the right scale), ranging from -320 to 320, which synchronously reflects the power and current running fluctuations of the variable frequency compressor and the whole machine.

[0156] At the first power-on, the initial sharp power overload peak (up to 280W, individual model up to 300W) is quickly reduced, and finally stabilized at a normal operating power level of about 130W, which presents the complete power change from overload to stable. And curve 2 and curve 1 change trend is completely consistent, the initial power-on period synchronously appears current peak, and the later period synchronously reduces to stable state with the power reduction, which directly reflects the synchronous overload and stable change of current with power fluctuation.

[0157] Curve 3 is initially at ambient temperature, and quickly decreases with the operation of the variable frequency compressor, and finally stabilizes in the range of -20℃ to -30℃, which is the temperature change curve of the refrigeration compartment of the refrigerator freezer, and reflects the refrigeration process from ambient temperature to target low temperature and stable state.

[0158] In the related art, the variable frequency compressor first runs at the oiling speed to ensure lubrication, and then directly jumps to the highest speed allowed by the variable frequency compressor for continuous operation. This logic directly causes the curve change: because the running time at the oiling speed is too short, the variable frequency compressor refrigeration system does not complete the balance of the suction and exhaust pressure, so it is forced to increase the frequency to the highest speed, resulting in instantaneous overload of power (curve 1) and current (curve 2), and a sharp peak value; as the system gradually stabilizes, the power and current quickly fall to a stable level; and the power peak value corresponds to high-load strong refrigeration of the variable frequency compressor, so the temperature curve (curve 3) quickly decreases, and after the power and current are stable, the temperature gradually stabilizes to the target low temperature range, forming a linkage change of power / current first overload peak and then stable, and temperature first quickly increases and then stable.

[0159] Based on the above description, when the power is instantaneously overloaded, the maximum power of the refrigerator is more than 280W (individual more than 300W), and the stable running power is only about 130W, with a large gap between the power peak value and the stable value. This current overload and power overload phenomenon will cause additional safety compliance investment (such as strengthening the electrical safety design, protection device selection, etc. to cope with the overload), and optimize the product cost.

[0160] Therefore, in order to avoid the problem of power overload at the first power-on, the controller can control the speed of the variable frequency compressor at the first power-on according to the S1001-S1004 steps as shown in FIG. 10. Figure 10 The details are as follows:

[0161] S1001, if it is detected that the refrigerator is first powered on, the variable frequency compressor is controlled to run at a preset oiling speed for a sixth preset time.

[0162] In an embodiment, the above-mentioned preset oiling speed and the role have been explained above, and will not be described again. It should be noted that the sixth preset time can be the same as the fifth preset time, or can be greater than the fifth preset time, which is not limited.

[0163] S1002, adjust the preset oiling speed to a preset transition speed after the sixth preset time length.

[0164] The preset transition speed is greater than the preset oiling speed and less than the highest speed.

[0165] In an embodiment, the preset transition speed is a preset operating speed of the variable frequency compressor between the preset oiling speed and the highest allowable speed, which is higher than the oiling speed (to meet the basic refrigeration demand) and lower than the highest speed (to avoid sudden change of system load), and is used as a buffer connection speed between the lubrication stage and the high-load refrigeration stage, so that the variable frequency compressor refrigeration system (suction and exhaust pressures, internal oil circuit) gradually adapts to the operating state of higher load, and avoids pressure imbalance and power / current overload caused by direct jump to the highest speed.

[0166] It should be noted that after the variable frequency compressor completes the oiling speed operation of the sixth preset time length (completes initial lubrication and establishes 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, which can make a transition for subsequent entry into higher-load refrigeration operation by increasing the speed, thereby ensuring uninterrupted lubrication effect and avoiding system impact caused by sudden speed increase.

[0167] S1003, if the fourth operating time length of the variable frequency compressor is greater than a seventh preset time length, the preset transition speed is adjusted to the highest speed for operation until the refrigerator meets the preset gear stop requirement and enters the standby state.

[0168] S1004, if the fourth operating 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 operating time length is greater than the seventh preset time length.

[0169] In an embodiment, the seventh preset time length is a preset time threshold for determining whether the refrigeration system (suction and exhaust pressures on both sides, internal oil circuit) has completed sufficient balance and stability when the variable frequency compressor operates at the preset transition speed. As an example, the seventh preset time length can be 30 minutes.

[0170] It should be noted that the purpose of controlling the variable frequency compressor to operate at the transition speed is to ensure that the refrigerator has high refrigeration capacity, and to adjust to the highest speed after the refrigeration system and the variable frequency compressor suction and exhaust pressures on both sides reach a stable balance state to avoid high current overload and power overload, which can cause damage to the electrical system of the refrigerator. Furthermore, the heat dissipation investment of the control panel can be reduced to a certain extent, and the use of control panel related consumables can be reduced.

[0171] In an embodiment, refer to Figure 11 , Figure 11 is a schematic diagram of an application scenario for adjusting the speed of a variable frequency compressor in a control method of a refrigerator in another embodiment of the present application. Refer to Figure 11 , the horizontal coordinate is time (minutes), ranging from 0 to 210 minutes, and the full cycle running time from starting refrigeration, temperature drawing and cooling to temperature stabilization and variable frequency compressor shutdown after the refrigerator is powered on for the first time is recorded. The left vertical coordinate is temperature (°C), ranging from -40°C to 110°C, which is used to represent the temperature change trend of the core refrigeration compartment (such as the freezer compartment) of the refrigerator, reflecting the refrigeration temperature drawing and steady state effect. The right vertical coordinate is power (W), ranging from -30W to 300W, which synchronously reflects the power fluctuation (the current curve and the power curve trend are completely consistent) in the running process of the variable frequency compressor, reflecting the load change in different speed stages.

[0172] Curves 1 and 2 are power / current curves (corresponding to the right vertical coordinate, curve 1 is power and curve 2 is current, the trend is consistent), and curve 3 is the cabin temperature curve (corresponding to the left vertical coordinate, such as the freezer compartment), which matches the first power-on control logic.

[0173] Specifically, in the initial lubrication stage, the controller detects that the refrigerator is powered on for the first time, controls the variable frequency compressor to run at a preset oiling speed for a sixth preset time, and this stage is to establish the lubricating oil film. The power / current curve (1, 2) appears a first sharp peak value (the running power corresponding to the oiling speed), and the temperature curve (3) only decreases slightly, because the oiling stage is mainly lubrication, and the refrigeration efficiency is low.

[0174] In the transition speed switching stage, the sixth preset time is reached, and 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 highest speed). The transition speed is higher than the oiling speed in this stage, the refrigeration load is improved, the power / current curve (1, 2) appears a second peak value (the amplitude is slightly lower than the first peak value), and the temperature curve (3) starts to rapidly decrease, entering the effective refrigeration stage.

[0175] In the transition speed running and frequency raising stage, the controller monitors the fourth running time of the variable frequency compressor at the transition speed, and compares it with the seventh preset time. If the fourth running time is greater than the seventh preset time (indicating that the refrigeration system suction and exhaust pressure and oil circuit have been fully balanced), the controller adjusts the transition speed to the highest speed for running. In this stage, the power / current curve (1, 2) is maintained at a relatively high and stable level (high load refrigeration power at the highest speed), and the temperature curve (3) accelerates to decrease and rapidly draw down to the target low temperature until the preset gear shutdown condition is met. The power / current decreases to the controller standby power consumption level, and the temperature stabilizes in the target interval of about -30°C.

[0176] If the fourth running duration is less than or equal to the seventh preset duration, the controller maintains the transition speed operation, the power / current curve (1, 2) maintains the stable transition speed corresponding power level, and the temperature curve (3) continues to gently decrease until the stop condition is reached to directly standby, or after the fourth running duration accumulates more than the seventh preset duration during operation, the frequency is increased to the highest speed to complete the remaining refrigeration, and finally the temperature is stably stopped.

[0177] In the embodiment, by controlling the frequency conversion compressor to run at the preset oiling speed for the sixth preset duration at first power-on, a stable lubricating oil film can be quickly established to provide sufficient lubrication protection for the start of the frequency conversion compressor. Subsequently, the speed is adjusted to the preset transition speed between the oiling speed and the highest speed to form a speed buffer connection to avoid the impact of sudden speed increase on the refrigeration system. Finally, in combination with the judgment of the fourth running duration of the frequency conversion compressor and the seventh preset duration, the frequency is increased to the highest speed only after the system pressure and oil circuit are fully stable, which not only effectively avoids the power and current overload and the aggravation of the wear of moving parts caused by the increase of frequency before the system is balanced, but also can strengthen the refrigeration efficiency at the highest speed after stabilization to quickly meet the refrigeration demand of the preset grade of the refrigerator, and optimize the refrigeration effect and the operation reliability of the whole machine after the first power-on.

[0178] In another embodiment, when it is detected that the refrigerator is running for the first power-on, an update flag bit also needs to be generated. In the next start-up cycle of the first power-on, the preferred speed is preferably the preset preferred speed.

[0179] In an embodiment, the above-mentioned preset preferred speed can be the default speed preset at the factory of the refrigerator as the initial running reference of the frequency conversion compressor, which provides a standardized initial speed basis for the start-up operation of the frequency conversion compressor when there is no historical running data and no optimized preferred speed, and is the basic reference speed of the speed control logic.

[0180] The next start-up cycle of the first power-on refers to the first start-up cycle of restarting the frequency conversion compressor due to the refrigeration demand such as the temperature rise in the cabin after the completion of the complete running process (from starting refrigeration to meeting the stop condition to enter standby) of the first power-on, which is the first non-first power-on start-up cycle after the first power-on.

[0181] It should be noted that the next start-up cycle of the first power-on is a non-first power-on start-up cycle, and there is an update flag bit, so the S104 step will be executed to enter the above-mentioned Figures 1-8 control flow.

[0182] In the embodiment, by generating the update flag bit when the refrigerator is powered on for the first time, and setting the preferred rotation speed to the preset preferred rotation speed in the next start-up cycle, a stable reference rotation speed is provided for the initial stage without historical operation data, and control logic abnormalities caused by the absence of the preferred rotation speed are avoided. Further, the smooth start-up and operation of the variable frequency compressor in the start-up cycle after the first power-on can be ensured, and an initial basis is provided for the subsequent rotation speed optimization process based on the start-up rate, ensuring that the entire rotation speed control logic is orderly and reliably executed from the initial stage, and the continuity and stability of the entire machine operation are improved.

[0183] It should be understood that the size of the serial number of each step in the above embodiment does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0184] In another embodiment, as shown in Figure 1 The refrigerator can be used to implement the control method of the refrigerator described in the method embodiment.

[0185] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A refrigerator, characterized in that, include: The variable frequency compressor is configured to adjust its operating speed in response to control commands from the controller; The controller is configured as follows: For any startup cycle of the variable frequency compressor that is not powered on for the first time, if no update flag for the preferred speed is detected during the startup of the variable frequency compressor, the first duration for which the variable frequency compressor runs at the preferred speed is recorded; 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; the preferred speed is the optimal variable frequency compressor speed adapted to the current operating conditions, determined by the refrigerator through dynamic iterative adaptation and after stable operation verification; If the first duration is greater than the first preset duration, then 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 shutdown requirement and then enters standby mode; When the variable frequency compressor is started, 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 variable frequency compressor is controlled according to the second running time until the refrigerator meets the shutdown requirement of the gear and then enters the standby state; When the variable frequency compressor is started, 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, 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.

2. The refrigerator according to claim 1, characterized in that, The controller, which controls the operating speed of the variable frequency compressor according to the second running time, is configured as follows: 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; If the second running time is less than or equal to the second preset time, and / or the current operating speed of the variable frequency compressor is equal to the maximum speed, then the variable frequency compressor is controlled to maintain the current operating speed.

3. The refrigerator according to claim 1, characterized in that, The controller controls the operating speed of the variable frequency compressor according to the first start-up rate, and is configured as follows: The target operating speed is determined based on the first start-up rate; Adjust the operating speed of the variable frequency compressor to the target operating speed; The cumulative duration of operation of the variable frequency compressor at the target operating speed during multiple start-up cycles is calculated. If the cumulative duration is greater than or equal to the third preset duration, then the target operating speed is determined as the new preferred speed; If the cumulative duration is less than the third preset duration, the target operating speed will not be determined as the new preferred speed.

4. The refrigerator according to claim 3, characterized in that, The controller determines the target operating speed based on the first start-up rate and is configured as follows: 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; 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. If the first start-up rate is less than the second start-up rate, and the shutdown speed is equal to the minimum speed, then the shutdown speed is determined as the target operating speed; If the first start-up rate is greater than the third start-up rate, then the preferred speed and the third preset speed are added together to obtain the target operating speed; Adjust the preferred speed to the target operating 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 controlling the operating speed of the variable frequency compressor according to the first start-up rate, the controller is further configured to: Determine the third operating duration of the variable frequency compressor within the first start-up cycle; 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; 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 the variable frequency compressor is controlled to maintain the target running speed.

7. The refrigerator according to any one of claims 1-6, characterized in that, The controller is also configured to: For any startup cycle of the variable frequency compressor that is not powered on for the first time, when the variable frequency compressor is running, the variable frequency compressor is controlled to run at a preset oiling speed for a fifth preset duration. After the fifth preset time period, the speed of the variable frequency compressor is adjusted to the preferred speed.

8. The refrigerator according to any one of claims 1-6, characterized in that, The controller is also configured to: If it is detected that the refrigerator is being powered on for the first time, the inverter compressor is controlled to run at a preset oiling speed for a sixth preset time. After the sixth preset time period, 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 the maximum speed. If the fourth running time of the variable frequency compressor is greater than the seventh preset time, the preset transition speed is adjusted to the highest speed until the refrigerator meets the preset stop requirement and then enters the standby state. If the fourth running time of the variable frequency compressor is less than or equal to the seventh preset time, the preset transition speed is maintained until the refrigerator meets the preset shutdown requirement and enters standby mode, or the fourth running time is greater than the seventh preset time.

9. The refrigerator according to claim 8, characterized in that, The controller is also configured to: When the refrigerator is detected to be running for the first time, the update flag is generated; in the next startup cycle of the first power-on operation, the preferred speed is the preset preferred speed.

10. A method for controlling a refrigerator, characterized in that, Applied to a refrigerator, the refrigerator includes a variable frequency compressor, the variable frequency compressor being used to adjust the operating speed of the variable frequency compressor in response to control commands from a controller; the control method of the refrigerator includes: For any startup cycle of the variable frequency compressor that is not powered on for the first time, if no update flag for the preferred speed is detected during the startup of the variable frequency compressor, the first duration for which the variable frequency compressor runs at the preferred speed is recorded; 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; the preferred speed is the optimal variable frequency compressor speed adapted to the current operating conditions, determined by the refrigerator through dynamic iterative adaptation and after stable operation verification; If the first duration is greater than the first preset duration, then 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 shutdown requirement and then enters standby mode; When the variable frequency compressor is started, 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 variable frequency compressor is controlled according to the second running time until the refrigerator meets the shutdown requirement of the gear and then enters the standby state; When the variable frequency compressor is started, 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, 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.

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