A compressor control method, an electrical appliance, a computer device and a readable storage medium

Abstract

The present invention provides a control method, an electrical appliance, a computer device and a readable storage medium for a compressor. A control method for a compressor includes obtaining the operating frequency of the compressor and judging whether the compressor is in a low-frequency operating state and does not exceed the frequency change threshold within a target time period according to the operating frequency; if so, obtaining the corresponding preset frequency according to the operating frequency; obtaining the power of the compressor, and at the preset frequency, when the power reaches the corresponding preset power, the compressor runs for a corresponding preset time and then shuts down. The corresponding preset power is less than the preset threshold. The control method for the compressor can control the compressor to shut down at a certain frequency, so that the compressor will not have a liquid hammer phenomenon, thereby avoiding the occurrence of abnormal noise, protecting the compressor, improving the care effect, and improving the user experience.

Description

Technical Field

[0001] The present invention relates to the field of laundry equipment, and in particular to a control method for a compressor, an electrical appliance, a computer device and a readable storage medium. Background Art

[0002] With the development of science and technology, people's living standards are getting higher and higher, household appliances are becoming more and more complete, and washing machines have become an indispensable tool in people's lives, bringing great convenience to people in life. People's requirements for washing machines are also getting higher and higher, shifting from washing and drying to washing and care, and the application of heat pump washing machines is also increasing. Along with this are the problems exposed by the compressor during the application process.

[0003] If the compressor is in low-frequency operation for a long time, the refrigerant will not be able to fully react and will be sucked into the machine by the compressor, resulting in the phenomenon that the liquid refrigerant and / or lubricating oil is sucked into the compressor cylinder with the gas and damages the intake valve plate, or after entering the cylinder, it is not quickly discharged during the exhaust process, and is compressed when the piston approaches the top dead center, resulting in instantaneous high hydraulic pressure, that is, liquid hammer, which will cause the oil to return in time and cause abnormal noise. When the compressor is used in air conditioners, a timing method is used to prevent the occurrence of liquid hammer, but when it is used in washing machines, it is difficult to control the time because the time and stage of low-frequency operation are uncertain. Summary of the invention

[0004] The first object of the present invention is to provide a control method for a compressor, which can control the compressor to shut down at a certain frequency so that liquid hammer will not occur in the compressor, thereby avoiding the occurrence of abnormal noise, protecting the compressor, improving the care effect, and improving the user experience.

[0005] The second object of the present invention is to provide an electrical appliance for implementing the above control method.

[0006] A third object of the present invention is to provide a computer device for implementing the above-mentioned compressor control method.

[0007] A fourth object of the present invention is to provide a readable storage medium for implementing the above-mentioned compressor control method.

[0008] To achieve the above object, the present invention provides a control method for a compressor, including obtaining the operating frequency of the compressor and judging whether the compressor is in a low-frequency operating state according to the operating frequency and whether the operating frequency does not exceed the frequency change threshold within a target time period; if so, obtaining the corresponding preset frequency according to the operating frequency; obtaining the power of the compressor, and at the preset frequency, when the power reaches the corresponding preset power, the compressor runs for a corresponding preset time and then shuts down. The corresponding preset power is less than the preset threshold.

[0009] It can be seen from the above scheme that if the compressor is in a low-frequency working state for a long time, the refrigerant will not be able to fully react, and will be sucked into the machine by the compressor, causing liquid hammer. Before this, the power of the compressor will gradually increase. When the power reaches the preset threshold, the compressor is about to have liquid hammer. If the compressor is turned off only when the power reaches the preset threshold, there is a possibility of abnormal noise due to untimely shutdown. Therefore, before the power reaches the preset threshold, it runs for a certain period of time at the preset power. At this time, it can effectively ensure that the power is close to the preset threshold but is turned off before reaching the preset threshold. At this time, turning off the compressor can timely avoid liquid hammer. This control method can control the compressor to shut down at a certain frequency so that the compressor will not have liquid hammer, thereby avoiding the occurrence of abnormal noise, protecting the compressor, improving the care effect, and improving the user experience.

[0010] A preferred solution is that the number of preset frequencies is more than two, the values ​​of the multiple preset frequencies gradually increase, and each preset frequency corresponds to a preset power and a preset time; at each preset frequency, when the power reaches the preset power corresponding to the preset frequency, the compressor runs for a preset time corresponding to the preset frequency and then turns off.

[0011] A further solution is that when the operating frequency is between two adjacent preset frequencies, the preset frequency obtained is the smaller preset frequency of the two adjacent preset frequencies.

[0012] It can be seen that when the operating frequency is between two adjacent preset frequencies, it is processed at a lower frequency, that is, the smaller preset frequency is taken as the obtained preset frequency, which can protect the compressor.

[0013] A preferred solution is that if the compressor is in a low-frequency operating state and the operating frequency variation range within the target time period exceeds the frequency variation threshold, the compressor is shut down after reaching the remaining operating time; the operating frequency includes a first operating frequency, a second operating frequency, a third operating frequency, and an nth operating frequency that gradually increase; the remaining operating time of the compressor is calculated by the following formula: f(x)=k1(t1 / p1)+k2(t2 / p2)+k3(t3 / p3)+…+kn(tn / pn); wherein p1 is the corresponding frequency of the compressor at the first operating frequency power, t1 is the time the compressor runs at power p1, p2 is the power corresponding to the compressor at the second operating frequency, t2 is the time the compressor runs at power p2, p3 is the power corresponding to the compressor at the third operating frequency, t3 is the time the compressor runs at power p3, pn is the power corresponding to the compressor at the nth operating frequency, tn is the time the compressor runs at power pn; f(x) is a preset value, t1, t2, t3, tn can all be 0 and one of them is the remaining operating time, k1+k2+k3+……+kn=1, k1 > k2 > k3> … > kn.

[0014] It can be seen from this that if the frequency of the compressor changes during operation, and the frequency after the change is still in a low-frequency operating state, then follow this step to eliminate local errors through the proportional coefficient to better protect the compressor, and calculate the remaining operating time of the compressor through the above steps.

[0015] To achieve the above second objective, the present invention provides an electrical appliance, the electrical appliance comprising a processor, and the processor is used to implement the above compressor control method when executing a program stored in a memory.

[0016] To achieve the third objective, the present invention provides a computer device, which includes a processor, and the processor is used to implement the above-mentioned compressor control method when executing a program stored in a memory.

[0017] To achieve the fourth objective, the present invention provides a readable storage medium having a program stored thereon, and when the program is executed by a processor, the above-mentioned compressor control method is implemented. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of an embodiment of a method for controlling a compressor of the present invention.

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0020] Embodiment of the electrical appliance and control method thereof:

[0021] The electrical appliance in this embodiment is a washing machine, which includes a processor. The processor is used to implement the compressor control method described below when executing a program stored in a memory.

[0022] The compressor control method comprises the following steps:

[0023] See also Figure 1 First, step S1 is executed to obtain the operating frequency of the compressor, and then step S2 is executed to determine whether the compressor is in a low-frequency operating state according to the operating frequency. If the compressor is in a low-frequency operating state and the operating frequency does not exceed the frequency change threshold within the target time period, step S3 is executed to obtain the corresponding preset frequency according to the operating frequency. Generally, when the operating frequency is lower than 30Hz, the compressor is determined to be in a low-frequency operating state.

[0024] Then, step S4 is performed to obtain the power of the compressor. At the preset frequency, when the power reaches the corresponding preset power, the compressor runs for the corresponding preset time and then shuts down. The corresponding preset powers are all less than the preset threshold. When the power reaches the preset threshold, the compressor has a risk of liquid hammer.

[0025] There are more than two preset frequencies, and the multiple preset frequencies are respectively a first preset frequency a1, a second preset frequency a2, ... and an Nth preset frequency aN, which are gradually increasing in value. Under the first preset frequency a1, when the power reaches the first preset power b1, the compressor runs for the first preset time n1 and then turns off; under the second preset frequency a2, when the power reaches the second preset power b2, the compressor runs for the second preset time n2 and then turns off; under the Nth preset frequency aN, when the power reaches the Nth preset power bN, the compressor runs for the Nth preset time nN and then turns off, as shown in the following table.

[0026] Compressor corresponding preset frequency / Hz Preset power / W Preset time / min a1 b1 n1 a2 b2 n2 ...... ...... ...... aN Bn n

[0027] Optionally, the values ​​of the parameters in the above table are as follows:

[0028] Compressor corresponding preset frequency / Hz Preset power / W Preset time / min 5 60 10 10 70 15 15 80 20

[0029] That is, when the preset frequency is 5Hz, after the power reaches 60W, the compressor will run for another 10 minutes before shutting down; when the preset frequency is 10Hz, after the power reaches 70W, the compressor will run for another 15 minutes before shutting down; when the preset frequency is 15Hz, after the power reaches 80W, the compressor will run for another 20 minutes before shutting down. The washing machine controller obtains the corresponding preset power and preset time in the above table according to its operating frequency, and the values ​​of the corresponding parameters of different washing machines may be different.

[0030] In addition, during operation, when the operating frequency is between two adjacent preset frequencies in the above table, in order to protect the compressor, it is processed according to the lower preset frequency, that is, the preset frequency obtained is the smaller preset frequency of the two adjacent preset frequencies.

[0031] If the compressor is in a low frequency operation state and the change range of the operating frequency within the target time period exceeds the frequency change threshold, step S5 is executed, and the compressor is shut down after reaching the remaining operating time. The operating frequency includes a first operating frequency, a second operating frequency, a third operating frequency, ... and an nth operating frequency that gradually increase. The remaining running time of the compressor is calculated by the following formula: f(x)=k1(t1 / p1)+k2(t2 / p2)+k3(t3 / p3)+…+kn(tn / pn); wherein p1 is the power corresponding to the compressor at the first operating frequency, t1 is the time the compressor runs at power p1, p2 is the power corresponding to the compressor at the second operating frequency, t2 is the time the compressor runs at power p2, p3 is the power corresponding to the compressor at the third operating frequency, t3 is the time the compressor runs at power p3, pn is the power corresponding to the compressor at the nth operating frequency, and tn is the time the compressor runs at power pn; f(x) is a preset value. Optionally, the value of f(x) can be 0.15. The value of this value varies for different washing machine models. t1, t2, t3, and tn can all be 0 and one of them is the remaining running time. k1+k2+k3+…+kn=1, k1 > k2 > k3 > … > kn.

[0032] It can be seen from the above that if the compressor is in a low-frequency working state for a long time, the refrigerant will not be able to fully react, and will be sucked into the machine by the compressor, causing liquid hammer. Before this, the power of the compressor will gradually increase. When the power reaches the preset threshold, the compressor is about to experience liquid hammer. If the compressor is not turned off until the power reaches the preset threshold, there is a possibility of abnormal noise due to untimely shutdown. Therefore, before the power reaches the preset threshold, it runs for a certain period of time at the preset power. At this time, it can effectively ensure that the power is close to the preset threshold but is turned off before reaching the preset threshold. At this time, turning off the compressor can timely avoid liquid hammer. This control method can control the compressor to shut down at a certain frequency so that the compressor will not experience liquid hammer, thereby avoiding the occurrence of abnormal noise, protecting the compressor, improving the care effect, and improving the user experience.

[0033] Computer device embodiment:

[0034] The computer device of the present invention is a controller inside the appliance, including a processor and a memory, such as a single chip microcomputer including a central processing unit, etc. Moreover, the processor is used to implement the steps of the above-mentioned compressor control method when executing the computer program stored in the memory.

[0035] For example, a computer program may be divided into one or more modules, one or more modules are stored in a memory and executed by a processor to complete each module of the present invention. One or more modules may be a series of computer program instruction segments capable of completing a specific function, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0036] The processor referred to in the present invention may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the electrical appliance, and uses various interfaces and lines to connect various parts of the entire electrical appliance.

[0037] The memory can be used to store computer programs and / or modules. The processor realizes various functions of the appliance by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the appliance (such as audio data, a phone book, etc.), etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0038] Readable storage medium embodiment:

[0039] If the computer program stored in the memory of an appliance such as a washing machine is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a readable storage medium. When the computer program is executed by a processor, it can implement each step of the above-mentioned compressor control method.

[0040] The computer program includes computer program code, which may be in source code form, object code form, executable file or some intermediate form, etc. Computer readable media may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0041] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling a compressor, characterized in that: include: The operating frequency of the compressor is obtained, and according to the operating frequency, it is determined whether the compressor is in a low-frequency operating state and the operating frequency does not exceed a frequency change threshold within a target time period; If yes, obtain the corresponding preset frequency according to the operating frequency, and look up the table to obtain the preset power and the corresponding preset time corresponding to the preset frequency; Acquire the power of the compressor, and under the preset frequency, when the power reaches the corresponding preset power, control the compressor to run for a corresponding preset time, and shut down the compressor before the power of the compressor reaches a preset threshold, and the corresponding preset power is less than the preset threshold; The number of the preset frequencies is more than two, the values ​​of the multiple preset frequencies gradually increase, and each of the preset frequencies corresponds to a preset power and a preset time; At each preset frequency, when the power reaches the preset power corresponding to the preset frequency, the compressor runs for a preset time corresponding to the preset frequency and then shuts down.

2. A compressor control method according to claim 1, characterized in that: When the operating frequency is between two adjacent preset frequencies, the acquired preset frequency is the smaller preset frequency of the two adjacent preset frequencies.

3. A compressor control method according to claim 1 or 2, characterized in that: If the compressor is in a low-frequency operation state and the variation range of the operating frequency within the target time period exceeds the frequency variation threshold, the compressor is shut down after the remaining operating time is reached; The operating frequencies include a first operating frequency, a second operating frequency, a third operating frequency, ... and an nth operating frequency which gradually increase; The remaining operating time of the compressor is calculated by the following formula: f(x)=k1(t1 / p1)+k2(t2 / p2)+k3(t3 / p3)+……+kn(tn / pn); Wherein, p1 is the power corresponding to the compressor at the first operating frequency, t1 is the time when the compressor runs at the power p1, p2 is the power corresponding to the compressor at the second operating frequency, t2 is the time when the compressor runs at the power p2, p3 is the power corresponding to the compressor at the third operating frequency, t3 is the time when the compressor runs at the power p3, pn is the power corresponding to the compressor at the nth operating frequency, and tn is the time when the compressor runs at the power pn; f(x) is a preset value, t1, t2, t3, tn can all be 0 and one of them is the remaining running time, k1+k2+k3+…+kn=1, k1>k2>k3>…>kn.

4. An electrical appliance, characterized in that The electrical appliance comprises a processor, and the processor is used to implement a compressor control method according to any one of claims 1 to 3 when executing a program stored in a memory.

5. A computer device, characterized in that: The computer device comprises a processor, and the processor is used to implement a compressor control method according to any one of claims 1 to 3 when executing a program stored in a memory.

6. A readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, a compressor control method according to any one of claims 1 to 3 is implemented.

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