A control method and control device of a compressor, a storage medium and a refrigerator

Abstract

This application provides a compressor control method, control device, storage medium, and refrigerator. The compressor control method, applied to a refrigerator, includes: when the compressor meets preset operating conditions, controlling the compressor to increase a preset speed based on the current speed; acquiring a first power during the process of increasing the preset speed; determining a target speed based on the first power; and adjusting the compressor's operating speed according to the target speed. The compressor control method provided in this application utilizes a first power that reflects the load size to determine a target speed that matches the load, and adjusts the compressor's operating speed accordingly. This achieves matching the compressor speed to the load size, improves the accuracy of load detection and the energy utilization rate of the refrigerator, and allows for faster adjustment.

Description

Technical Field

[0001] This application belongs to the field of compressor technology, and in particular relates to a compressor control method, control device, storage medium and refrigerator. Background Technology

[0002] The speed control of existing inverter refrigerator compressors is usually based on the difference between the actual temperature of the refrigerator compartment and the set temperature, and the appropriate speed is matched in a preset speed table. However, the difference between the actual temperature of the refrigerator compartment and the set temperature can only roughly reflect the refrigerator load, and cannot accurately obtain the refrigerator load, resulting in low energy utilization of the refrigerator. Summary of the Invention

[0003] This application provides a compressor control method, control device, storage medium, and refrigerator to solve the problem that existing refrigerator compressors match a suitable speed in a preset speed table based on the difference between the actual temperature of the refrigerator compartment and the set temperature, resulting in low energy utilization of the refrigerator.

[0004] This application provides a compressor control method applied to a refrigerator, the method comprising:

[0005] Once the compressor meets the preset operating conditions, control the compressor to increase the preset speed based on the current speed;

[0006] Obtain the first power during the process of the compressor increasing the preset speed;

[0007] The target speed is determined based on the first power, and the compressor is controlled to operate at the target speed.

[0008] Optionally, before controlling the compressor to increase the preset speed based on the current speed, the method further includes:

[0009] When the compressor is started, control the compressor to run at a first speed;

[0010] If the actual speed of the compressor is the same as the first speed within a first preset time period, then the compressor is determined to meet the preset operating conditions.

[0011] Optionally, determining the target rotational speed based on the first power includes:

[0012] The second power of the compressor during a first preset time period at a first speed is obtained;

[0013] Calculate the power difference between the first power and the second power;

[0014] The target rotational speed is determined based on the power difference.

[0015] Optionally, determining the target rotational speed based on the power difference includes:

[0016] Based on the mapping table between power and speed, the target speed corresponding to the power difference is determined.

[0017] Optionally, obtaining the first power during the process of the compressor increasing the preset speed includes:

[0018] Obtain the power interval within each start-stop cycle during the process of the compressor increasing the preset speed;

[0019] The average value of the power in the multiple intervals is calculated to obtain the first power.

[0020] Optionally, after controlling the compressor to operate at the target speed, the method further includes:

[0021] If the compressor runs for longer than a second preset duration, then the compressor is determined to meet the preset operating conditions.

[0022] Optionally, after controlling the compressor to operate at the target speed, the method further includes:

[0023] The cumulative number of times the compressor's operating speed is adjusted within a third preset time period;

[0024] If the number of adjustments exceeds the preset number, the compressor is controlled to operate at a second speed.

[0025] This application embodiment also provides a compressor control device applied to a refrigerator, the device comprising:

[0026] The speed-up module is configured to control the compressor to increase the preset speed based on the current speed after the compressor meets the preset operating conditions;

[0027] The power acquisition module is configured to acquire the first power during the process of the compressor increasing the preset speed;

[0028] The control module is configured to determine a target speed based on the first power and control the compressor to operate at the target speed.

[0029] This application embodiment also provides a storage medium for use in a refrigerator, wherein the storage medium stores control instructions, and when the control instructions are executed by a processor, the compressor control method described above is implemented.

[0030] This application also provides a refrigerator, including:

[0031] compressor;

[0032] A controller configured to perform the compressor control method as described above.

[0033] The compressor control method provided in this application embodiment requires the compressor to overcome the load during acceleration. Therefore, it acquires the first power during the acceleration process, which reflects the load size. Generally, the larger the load, the larger the first power, and vice versa. By using this first power to determine the target speed that matches the load, the compressor's operating speed is adjusted accordingly. This achieves matching the compressor speed to the load size, improving the accuracy of load detection and the energy efficiency of the refrigerator. Compared to traditional control methods that adjust the compressor speed based on the difference between the actual temperature and the set temperature of the refrigerator compartment, the control method provided in this application embodiment can detect the refrigerator's load during the compressor startup phase and adaptively adjust the compressor's operating speed based on the load. This results in faster adjustment, saves time in acquiring and determining the compartment and ambient temperatures, and achieves a higher degree of matching between the compressor's operating speed and the refrigerator's load. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0035] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings. In the following description, the same reference numerals denote the same parts.

[0036] Figure 1 This is a usage scenario diagram of the compressor control method provided in the embodiments of this application.

[0037] Figure 2 A flowchart of a compressor control method provided in an embodiment of this application.

[0038] Figure 3 This is a structural diagram of the compressor control device provided in an embodiment of this application.

[0039] Figure 4 This is a structural diagram of an electronic device provided in an embodiment of this application.

[0040] Figure 5 An interactive diagram of a refrigerator provided in an embodiment of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] In the description of the embodiments of this application, "module" and "processor" can include hardware, software, or a combination of both. A module can include hardware circuitry, various suitable sensors, communication ports, and memory, and may also include software components, such as program code, or a combination of software and hardware. A processor can be a central processing unit, a microprocessor, a digital signal processor, or any other suitable processor. The processor has data and / or signal processing capabilities. The processor can be implemented in software, in hardware, or a combination of both. Non-transitory computer-readable storage media includes any suitable medium capable of storing program code, such as magnetic disks, hard disks, optical disks, flash memory, read-only memory, random access memory, etc.

[0043] This application provides a compressor control method, control device, storage medium, and refrigerator to solve the problem that existing refrigerator compressors match a suitable speed in a preset speed table based on the difference between the actual temperature of the refrigerator compartment and the set temperature, resulting in low energy utilization of the refrigerator. The following will be described in conjunction with the accompanying drawings.

[0044] The compressor control method provided in this application is applied to a refrigerator. Please refer to [link / reference]. Figure 1 and Figure 2 , Figure 1 This is a usage scenario diagram of the compressor control method provided in the embodiments of this application. Figure 2 A flowchart of a compressor control method provided in this application embodiment, the method including the following steps:

[0045] Step S101: When the compressor meets the preset operating conditions, control the compressor to increase the preset speed based on the current speed;

[0046] Step S102: Obtain the first power during the process of the compressor increasing the preset speed;

[0047] Step S103: Determine the target speed based on the first power and control the compressor to run at the target speed.

[0048] The compressor control method provided in this application embodiment requires the compressor to overcome the load during acceleration. Therefore, it acquires the first power during the acceleration process, which reflects the load size. Generally, the larger the load, the larger the first power, and vice versa. By using this first power to determine the target speed that matches the load, the compressor's operating speed is adjusted accordingly. This achieves matching the compressor speed to the load size, improving the accuracy of load detection and the energy efficiency of the refrigerator. Compared to traditional control methods that adjust the compressor speed based on the difference between the actual temperature and the set temperature of the refrigerator compartment, the control method provided in this application embodiment can detect the refrigerator's load during the compressor startup phase and adaptively adjust the compressor's operating speed based on the load. This results in faster adjustment, saves time in acquiring and determining the compartment and ambient temperatures, and achieves a higher degree of matching between the compressor's operating speed and the refrigerator's load.

[0049] Optionally, before controlling the compressor to increase the preset speed based on the current speed in step S101, the method further includes: after the compressor starts, controlling the compressor to run at a first speed; if the actual speed of the compressor is the same as the first speed within a first preset time period, then it is determined that the compressor meets the preset operating conditions.

[0050] Specifically, the compressor can be a permanent magnet synchronous motor (PMSM), which employs a back-EMF sensorless control algorithm. The sensorless control principle based on back-EMF primarily utilizes the back-EMF generated during motor operation to estimate rotor position and speed. In a PMSM, when the rotor rotates, a back-EMF is generated in the non-conducting phase windings. By detecting the terminal voltage of these non-conducting phase windings and processing it appropriately, the back-EMF information can be extracted, thereby estimating the rotor's position and speed. Specifically, when the motor operates at a certain speed, the waveform and phase of its back-EMF are closely related to the rotor position. By detecting the zero-crossing point or peak point of the back-EMF, the relative position of the rotor can be determined. Simultaneously, combined with the motor's electrical parameters and operating status, the absolute position and speed of the rotor can be further estimated. However, the drawbacks of this control principle include a small amplitude and low signal-to-noise ratio of the back-EMF when the motor is running at low speeds, leading to a decrease in the accuracy of rotor position and speed estimation.

[0051] Therefore, when the motor is first turned on, the motor speed is relatively low, resulting in a small back electromotive force amplitude. This reduces the accuracy of rotor position and speed estimation. In other words, when the motor speed is low, the accuracy of speed and power acquisition is also low. Therefore, after the compressor is turned on, it is first controlled to reach the first speed. When the compressor runs at the first speed for a first preset time, it indicates that the compressor is in a stable state. At this time, the back electromotive force amplitude is relatively large, and the accuracy of compressor speed and power acquisition is relatively high. It is then determined that the compressor meets the preset operating conditions. Subsequently, the compressor is controlled to increase the preset speed based on the first speed, and the first power during the compressor acceleration process is obtained to ensure the accuracy of the first power acquisition, thereby ensuring the accuracy of refrigerator load acquisition and further improving the accuracy of refrigerator load detection.

[0052] Optionally, determining the target speed based on the first power in step S103 includes: obtaining the second power of the compressor operating at the first speed for a first preset time; calculating the power difference between the first power and the second power; and determining the target speed based on the power difference. Wherein, the second power is less than the first power.

[0053] Since different compressors have different parameters and different loads during each operation, and even at the same speed, the power of the compressor may vary due to differences in ambient temperature and room temperature, in order to eliminate power fluctuations caused by different compressor parameters and loads, the second power of the compressor when it is running stably at the first speed before speed-up is calculated, and the power difference between the second power and the first power of the compressor when it increases the preset speed based on the first speed is calculated. The target speed is determined by this power difference, thereby improving the accuracy of load detection.

[0054] Optionally, determining the target speed based on the power difference includes: determining the target speed corresponding to the power difference based on a mapping table between power and speed.

[0055] The power-speed mapping table here can be a preset mapping table obtained through multiple experiments. In this mapping table, each power range corresponds to a set speed that matches it. That is, when the measured power difference belongs to one of the power ranges, the set speed corresponding to that power range is the optimal speed of the compressor under the current load. When the compressor runs at this set speed, the compressor's energy conversion rate is the highest.

[0056] Optionally, obtaining the first power during the compressor's increase in preset speed in step S102 includes: obtaining the interval power within each start-stop cycle during the compressor's increase in preset speed; and calculating the average of multiple interval powers to obtain the first power.

[0057] This involves acquiring the power of each start-stop interval during the compressor's acceleration process and calculating the average power of multiple intervals. This average power is the first power. By calculating the average power of multiple intervals, the accuracy of power acquisition during the compressor's acceleration process is improved, preventing the power acquisition results from being unreal-time or inaccurate due to current fluctuations or other factors.

[0058] Optionally, after controlling the compressor to run at the target speed in step S103, the method further includes: if the compressor running time exceeds the second preset time, then it is determined that the compressor meets the preset operating conditions.

[0059] After the compressor's operating speed is adjusted to the target speed, if the user continues to store food in the refrigerator compartment or keeps the refrigerator door open for an extended period of time while the compressor is running at the target speed, the refrigerator's load will increase based on the load when the compressor's speed is adjusted. Therefore, the adjusted target speed may not be able to meet the cooling capacity required by the increased load. In this case, the compressor may run for more than the second preset time without reaching the shutdown point. That is, the current compressor speed cannot achieve the expected cooling effect within the preset time. Therefore, when the compressor's running time exceeds the second preset time, it is determined that the compressor meets the preset operating conditions. Then, the compressor speed is increased again to re-detect the refrigerator's current load and match the target speed that is suitable for the refrigerator's current load, thereby improving the refrigerator's energy efficiency.

[0060] Of course, the preset operating conditions also include when the compressor starts. This means that when the compressor starts, it can be determined that the compressor meets the preset operating conditions. Then, by increasing the speed of the compressor to obtain the first power, the load of the refrigerator is detected and matched with the target speed that is suitable for the load. This adjustment method has simpler control logic and lower hardware requirements.

[0061] It is understood that the compressor control method provided in this application embodiment has three preset operating conditions: when the compressor starts, when the compressor starts and controls the compressor to run at a first speed for a first preset time, and when the compressor runs for a longer than a second preset time after adjusting the compressor's operating speed to a target speed. When the compressor meets one of these operating conditions, the compressor can be controlled to speed up and the load can be detected.

[0062] Preferably, when the compressor meets the operating condition of running at a first speed for a first preset time after starting, the compressor is then controlled to speed up and the load is detected. If the compressor's operating time exceeds a second preset time after adjusting the compressor's operating speed to the target speed, the compressor is again controlled to speed up and the load is detected. At this point, the target speed and load are optimally matched during compressor operation, and the target speed can be adjusted accordingly when the load fluctuates.

[0063] Optionally, after controlling the compressor to operate at the target speed in step S103, the method further includes: accumulating the number of times the compressor's operating speed is adjusted within a third preset time period; if the number of adjustments is greater than the preset number, then controlling the compressor to operate at a second speed. The third preset time period is longer than the second preset time period. Specifically, the second speed can be the compressor's maximum speed.

[0064] When the compressor's operating speed is adjusted more times within the third preset time period than the preset number of times, it indicates that the compressor is adjusting more frequently within the third preset time period. During this period, the refrigerator load may fluctuate significantly. In order to save computing power and meet the cooling requirements of the load as soon as possible, the compressor is directly controlled to run at the second speed, which is the compressor's highest speed, thereby ensuring the preservation effect of the food in the compartment.

[0065] Optionally, after controlling the compressor to run at the second speed, the method further includes: clearing the currently accumulated number of adjustments, and re-accumulating the number of adjustments within a third preset time period based on the time corresponding to the clearing operation.

[0066] This application also provides a compressor control device applied to a refrigerator; please refer to [link / reference]. Figure 3 , Figure 3 This is a structural diagram of a compressor control device provided in an embodiment of this application. The device includes a speed-up module 1, a power acquisition module 2, and a control module 3. The speed-up module 1 is configured to control the compressor to increase a preset speed based on the current speed after the compressor meets preset operating conditions; the power acquisition module 2 is configured to acquire a first power during the process of the compressor increasing the preset speed; and the control module 3 is configured to determine a target speed based on the first power and control the compressor to run at the target speed.

[0067] This application also provides an electronic device 4, please refer to... Figure 4 , Figure 4 The present application provides a structural diagram of an electronic device 4, which includes a memory 41, a processor 42, and a computer program 411 stored in the memory 41 and executable on the processor 42. The electronic device 4 includes a memory 41, a processor 42, and a computer program 411 stored in the memory 41 and executable on the processor 42. The processor 42 executes the computer program 411 to implement the compressor control method described above.

[0068] This application embodiment also provides a storage medium applied to a refrigerator. The storage medium stores control instructions, which, when executed by the processor 42, implement the compressor control method described above.

[0069] This application also provides a refrigerator; please refer to [link / reference]. Figure 5 , Figure 5The interactive diagram of the refrigerator provided in this application embodiment includes a compressor and a controller. The controller is configured to execute the compressor control method as described above. It is understood that a compressor is a driven fluid machine that raises low-pressure gas to high-pressure gas, and is the heart of the refrigeration system. It draws in low-temperature, low-pressure refrigerant gas through the suction pipe, compresses it by a piston driven by a motor, and then discharges high-temperature, high-pressure refrigerant gas through the exhaust pipe, providing power for the refrigeration cycle.

[0070] In some examples, a permanent magnet synchronous variable frequency (PMSC) compressor can be selected. Its core feature is the use of a permanent magnet synchronous motor for drive, with the motor speed adjusted by a frequency converter, thereby achieving efficient operation and precise control of the compressor. The rotor of the PMSC motor is equipped with permanent magnets, and the stator has coils. When the stator coils are energized, a rotating magnetic field is generated, causing the permanent magnets to rotate under the influence of the magnetic field, thus driving the motor rotor. The frequency converter adjusts the motor speed by changing the power supply frequency and voltage. The frequency converter adjusts the motor speed in real time according to system requirements, thereby achieving precise control of the compressor. PMSC compressors can be scroll compressors, screw compressors, or piston compressors, etc. By adjusting the motor speed, the compressor's discharge capacity and cooling capacity can be flexibly adjusted to adapt to different operating conditions. PMSC compressors typically feature high efficiency and energy saving, high starting torque, small size, compact structure, stable operation, low noise, and high control precision.

[0071] For example, the computer program 411 may be divided into one or more modules / units, which are stored in the memory 41 and executed by the processor 42 to complete the present invention. The one or more modules / units may be a series of computer program 411 instruction segments capable of performing a specific function, which describe the execution process of the computer program 411 in the electronic device 4.

[0072] Electronic device 4 can be a desktop computer, laptop, handheld computer, cloud server, or other electronic device 4. Electronic device 4 may include, but is not limited to, processor 42 and memory 41. For example, electronic device 4 may also include input / output devices, network access devices, buses, etc.

[0073] The processor 42 can be a central processing unit (CPU), or other general-purpose processors 42, digital signal processors 42 (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor 42 can be a microprocessor 42, or any conventional processor 42, etc.

[0074] In the embodiments provided by this invention, it should be understood that the disclosed device / electronic device 4 and method can be implemented in other ways. For example, the embodiments of device / electronic device 4 described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. Multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0076] If integrated modules / units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program may include computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. Computer-readable media may include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in a computer-readable medium may be appropriately added to or subtracted according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media may not include electrical carrier signals and telecommunication signals.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0078] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0079] The control method, control device, storage medium, and refrigerator of the compressor provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A control method of a compressor applied to a refrigerator, characterized by, The method comprises: When the compressor meets the preset working condition, the compressor is controlled to increase the preset rotating speed based on the current rotating speed; A first power during the process of increasing the preset rotating speed of the compressor is obtained; A target rotating speed is determined according to the first power, and the compressor is controlled to operate at the target rotating speed; Before the control of the compressor to increase the preset rotating speed based on the current rotating speed, the method further comprises: After the compressor is started, the compressor is controlled to operate at a first rotating speed; If the actual rotating speed of the compressor is the same as the first rotating speed within a first preset time length, it is determined that the compressor meets the preset working condition; The determination of the target rotating speed according to the first power comprises: A second power during the process that the compressor operates at the first rotating speed within the first preset time length is obtained; A power difference value between the first power and the second power is calculated; The target rotating speed is determined according to the power difference value; The determination of the target rotating speed according to the power difference value comprises: According to a mapping relationship table of power and rotating speed, the target rotating speed corresponding to the power difference value is determined; The obtaining of the first power during the process of increasing the preset rotating speed of the compressor comprises: An interval power within each start-stop cycle during the process of increasing the preset rotating speed of the compressor is obtained; An average value of a plurality of interval powers is calculated to obtain the first power.

2. The control method of the compressor according to claim 1, characterized by, After the control of the compressor to operate at the target rotating speed, the method further comprises: If the operating time length of the compressor exceeds a second preset time length, it is determined that the compressor meets the preset working condition.

3. The control method of the compressor according to claim 1, characterized by, After the control of the compressor to operate at the target rotating speed, the method further comprises: The adjustment times of the operating rotating speed of the compressor within a third preset time length are accumulated; If the adjustment times are greater than a preset number of times, the compressor is controlled to operate at a second rotating speed, and the second rotating speed is the highest rotating speed of the compressor.

4. A control device of a compressor applied to a refrigerator, characterized by, The device comprises: A speed-up module configured to control the compressor to increase the preset rotating speed based on the current rotating speed when the compressor meets the preset working condition; before the control of the compressor to increase the preset rotating speed based on the current rotating speed, the device further comprises: after the compressor is started, the compressor is controlled to operate at a first rotating speed; if the actual rotating speed of the compressor is the same as the first rotating speed within a first preset time length, it is determined that the compressor meets the preset working condition; A power obtaining module configured to obtain a first power during the process of increasing the preset rotating speed of the compressor; the obtaining of the first power during the process of increasing the preset rotating speed of the compressor comprises: an interval power within each start-stop cycle during the process of increasing the preset rotating speed of the compressor is obtained; an average value of a plurality of interval powers is calculated to obtain the first power; The control module is configured to determine a target rotating speed according to the first power and control the compressor to operate at the target rotating speed; the determination of the target rotating speed according to the first power comprises: acquiring a second power of the compressor operating at a first rotating speed for a first preset time length; calculating a power difference value of the first power and the second power; determining a target rotating speed according to the power difference value; the determination of the target rotating speed according to the power difference value comprises: determining the target rotating speed corresponding to the power difference value according to a mapping relationship table of power and rotating speed.

5. A storage medium for use in a refrigerator, characterized by The storage medium stores control instructions, and the control instructions are executed by the processor to implement the control method of the compressor in any one of claims 1-3.

6. A refrigerator characterized by comprising: Comprises: A compressor; A controller configured to execute the control method of the compressor in any one of claims 1 to 3.

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