CN111780488A - Compressor control method and device capable of effectively adjusting rotating speed and refrigeration equipment - Google Patents
Compressor control method and device capable of effectively adjusting rotating speed and refrigeration equipment Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005057 refrigeration Methods 0.000 title claims abstract description 8
- 101150085390 RPM1 gene Proteins 0.000 claims description 21
- 101100361281 Caenorhabditis elegans rpm-1 gene Proteins 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 2
- 238000004134 energy conservation Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
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- 101100361283 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPM2 gene Proteins 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/02—Timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a compressor control method and device for effectively adjusting rotating speed and refrigeration equipment, wherein the method comprises the following steps: detecting the load change condition of the current operation period; determining the operation parameters of the current operation period according to the load change condition; wherein the operation parameters at least comprise an operation time parameter and an operation rotating speed parameter; and determining the starting rotating speed of the next operation period according to the operation parameters. The invention solves the problems that the control rule of the variable frequency compressor is fixed and the current operation parameters are not effectively utilized in the prior art, and realizes energy conservation and consumption reduction.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a compressor control method and device for effectively adjusting rotating speed and refrigeration equipment.
Background
With the development of the inverter technology and the wide application of the inverter compressor driving technology in the field of refrigerators, the inverter refrigerators are increasingly diversified. The frequency control and conversion refrigerator technology integrates the frequency conversion driving technology and the control rule on the frequency conversion board, the frequency conversion board directly drives and controls the frequency conversion compressor, and the main control board is not needed to output signals to the frequency conversion board. The structure and the control specification of the frequency conversion refrigerator are simplified, the cost of the refrigerator is reduced, and the market competitiveness of the product is improved.
The control rule of the machine-controlled variable frequency compressor used at present is that the initial rotating speed of the compressor, the operation speed-up time, the operation speed-up rate and the startup rate of the whole machine are preset, and when the speed-up time is reached, the compressor increases the operating rotating speed parameter at a specified rate until the whole machine stably operates according to the preset startup rate. Under this control rule, the rotational speed utilization ratio of compressor is low, and the frequency conversion advantage can't fully embody.
Aiming at the problems that the control rule of the frequency conversion compressor is fixed and the current operation parameters are not effectively utilized in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a compressor control method and device for effectively adjusting the rotating speed and refrigeration equipment, and aims to at least solve the problems that in the prior art, the control rule of a variable frequency compressor is fixed and the current operating parameters are not effectively utilized.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided a compressor control method including: detecting the load change condition of the current operation period; determining the operation parameters of the current operation period according to the load change condition; wherein the operation parameters at least comprise an operation time parameter and an operation rotating speed parameter; and determining the starting rotating speed of the next operation period according to the operation parameters.
Further, the load change condition at least comprises: load reduction and load increase; the runtime includes at least: an actual running time tp and a preset running time ts; the operating speed parameters at least include: the average value Vi of the rotational speed and the increment Va of the rotational speed.
Further, determining the operation parameters of the current operation period according to the load change condition includes: when the load change condition is load reduction, the rotating speed of the compressor in the current operation period is RPM1, the operation time of the compressor at the rotating speed RPM1 is t1, the actual operation time tp is t1, and the average rotating speed Vi is RPM 1.
Further, determining the operation parameters of the current operation period according to the load change condition, further comprising: when the load change condition is load increase, the rotating speed of the compressor in the current operation period is RPM1 … RPMn, the operation time of the compressor at the rotating speed RPM1 … RPMn is t1 … tn, the actual operation time tp is t1+ … + tn, and the average rotating speed Vi is ((RPM1 t1) + … + (RPMn) t)/(t 1+ … + tn); wherein n is more than or equal to 2.
Further, determining the operation parameters of the current operation period according to the load change condition, further comprising: calculating the operation rate of the compressor in the current operation period; wherein the operation rate is the ratio of the actual operation time tp to the preset operation time ts; determining a rotation speed increment Va according to the operation rate; wherein, a corresponding relation table of the rotating speed increment Va and the operating rate is preset.
Further, determining the starting rotation speed of the next operation period according to the operation parameters comprises: the starting rotational speed Vs for the next operating cycle is determined by the following formula: vs ═ Vi ═ ((η ═ ts-tp) + tp)/ts) + Va; wherein eta is a reduction coefficient.
Further, before detecting the load change condition of the current operation cycle, the method further comprises: and after the compressor is electrified and started to operate, the compressor operates at a preset maximum rotating speed until the temperature controller is disconnected.
Further, after determining the starting rotation speed of the next operation period according to the operation parameters, the method further comprises the following steps: detecting whether the starting rotating speed of the next operating period is consistent with a preset rotating speed or not; and if the current running period is inconsistent with the preset running period, continuously detecting the load change condition of the current running period until the starting rotating speed of the next running period is consistent with the preset rotating speed.
According to another aspect of an embodiment of the present invention, there is provided a compressor control apparatus including: the detection module is used for detecting the load change condition of the current operation period; the calculation module is used for determining the operation parameters of the current operation period according to the load change condition; wherein the operation parameters at least comprise an operation time parameter and an operation rotating speed parameter; and the determining module is used for determining the starting rotating speed of the next operation period according to the operation parameters.
According to a further aspect of an embodiment of the present invention, there is provided a refrigeration apparatus including the compressor control device as described above.
According to a further aspect of embodiments of the present invention there is provided a storage medium containing computer executable instructions which when executed by a computer processor are for performing a compressor control method as described above.
The invention provides a variable frequency control method, which determines the operation parameters of the current operation period, such as the operation time and the operation rotating speed parameter, according to the load change condition of the current operation period, and determines the starting rotating speed of the next operation period according to the operation parameters. The rotating speed parameter of the next starting operation is calculated in the mode and is circularly calculated according to the rotating speed parameter, the refrigerating capacity of the compressor is automatically compensated, the compressor stably operates at the required rotating speed under different environmental temperatures, and therefore the refrigerating efficiency of the compressor is improved, and the purposes of energy conservation and consumption reduction are achieved.
Drawings
FIG. 1 is an alternative flow chart of a compressor control method according to an embodiment of the present invention;
FIG. 2 is an alternative schematic illustration of the change in speed as the compressor load is reduced in accordance with an embodiment of the present invention;
FIG. 3 is an alternative schematic illustration of the change in speed as the compressor load increases in accordance with an embodiment of the present invention;
FIG. 4 is an alternative schematic illustration of the change in speed at start-up of the compressor according to an embodiment of the present invention; and
fig. 5 is an alternative configuration block diagram of a compressor control apparatus according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
In the preferred embodiment 1 of the present invention, a compressor control method is provided, which can be directly applied to various inverter compressors. In particular, fig. 1 shows an alternative flow chart of the method, which, as shown in fig. 1, comprises the following steps S102-S106:
s102: detecting the load change condition of the current operation period;
s104: determining the operation parameters of the current operation period according to the load change condition; wherein the operation parameters at least comprise operation time and operation rotating speed parameters;
s106: and determining the starting rotating speed of the next operation period according to the operation parameters.
In the above embodiment, a frequency conversion control method is provided, in which an operation parameter, such as an operation time and an operation rotation speed parameter, of a current operation cycle is determined according to a load change condition of the current operation cycle, and a start rotation speed of a next operation cycle is determined according to the operation parameter. The rotating speed parameter of the next starting operation is calculated in the mode and is circularly calculated according to the rotating speed parameter, the refrigerating capacity of the compressor is automatically compensated, the compressor stably operates at the required rotating speed under different environmental temperatures, and therefore the refrigerating efficiency of the compressor is improved, and the purposes of energy conservation and consumption reduction are achieved.
The load change situation at least comprises: load reduction and load increase; the runtime includes at least: an actual running time tp and a preset running time ts; the operating speed parameters at least include: the average value Vi of the rotational speed and the increment Va of the rotational speed.
The above operation parameters are calculated in different manners according to the load change, and when the load change is load reduction, the operation is stopped after the compressor is operated for time tp, so that the rotation speed of the compressor in the current operation period is RPM1, the operation time of the compressor at the rotation speed RPM1 is t1, the actual operation time tp is t1, and the average value Vi of the rotation speeds is RPM 1.
When the load change condition is load increase, the rotation speed of the compressor needs to be increased after the compressor is operated at the first rotation speed for a period of time so as to meet the requirement, the rotation speed increasing stage may comprise a plurality of stages, namely the rotation speed of the compressor in the current operation period is RPM1 … RPMn, the operation time of the compressor at the rotation speed RPM1 … RPMn is t1 … tn, the actual operation time tp is t1+ … + tn, and the average value Vi of the rotation speeds is ((1 t1) + … + (RPMn + tn))/(t1+ … + tn); wherein n is more than or equal to 2.
Further, determining the operation parameters of the current operation period according to the load change condition, further comprising: calculating the operation rate of the compressor in the current operation period; wherein the operation rate is the ratio of the actual operation time tp to the preset operation time ts; determining a rotation speed increment Va according to the operation rate; wherein, a corresponding relation table of the rotating speed increment Va and the operating rate is preset. The table below shows a table of the speed increment Va versus the operating rate of the actual operating time tp and the preset operating time ts in a preferred embodiment of the invention.
TABLE 1
| Operation ratio tp/ts (%) | Va(rpm) |
| 0～30 | -800 |
| 31～50 | -300 |
| 51～100 | 0 |
| 101～200 | 0 |
| 201～299 | 300 |
| ＞300 | 800 |
The speed increment helps to quickly increase or decrease the compressor speed if the current operating cycle is too short (no load) or the load change is too great. If the operating time deviation tp/ts is large, the adjusting amplitude of the rotating speed of the compressor is increased, and when tp/ts is less than 50%, the rotating speed of the compressor is rapidly reduced; when tp/ts is more than 200%, the rotating speed of the compressor is rapidly increased; the compressor speed increment will be added or subtracted to the starting speed calculation for the compressor for the next operating cycle.
After the operation parameters are determined, determining the starting rotating speed of the next operation period according to the operation parameters, comprising the following steps: the starting rotational speed Vs for the next operating cycle is determined by the following formula: vs ═ Vi ═ ((η ═ ts-tp) + tp)/ts) + Va; wherein eta is a reduction coefficient.
The following examples are given for illustrative purposes:
as shown in fig. 2, when the load of the compressor is reduced (such as the tank temperature is reduced, the ambient temperature is reduced, etc.), and the current operation period operation time tp of the compressor is less than the preset operation time ts (i.e., tp < ts), and the operation rotation speed in the current operation period is only RPM1, the operation rotation speed Vs of the next operation period will be reduced, and the operation rotation speed Vs of the next operation period is calculated based on the operation time tp and the average rotation speed of the current operation period, so as to avoid the large fluctuation of the compressor rotation speed control, an amplitude reduction coefficient η is added, and the following table is used for calculation (for example):
TABLE 2
As shown in fig. 3, when the compressor load increases (such as the ring temperature increases, the heat load is put in, etc.), and the current operation period operation time tp of the compressor exceeds the preset operation time ts (i.e., tp > ts), the compressor rotation speed is gradually increased until the thermostat is turned off.
When the operation rotation speeds in the current operation period include RPM1, RPM2 and RPM3 … …, the operation rotation speed Vs of the next operation period is calculated based on the operation time tp and the average rotation speed of the current operation period, in order to avoid large fluctuation of the compressor rotation speed control, an amplitude reduction coefficient η is added, and the following table is used for calculation (for example):
TABLE 3
In a preferred embodiment of the present invention, before detecting the load change condition of the current operation cycle, the method further includes: and after the compressor is electrified and started to operate, the compressor operates at a preset maximum rotating speed until the temperature controller is disconnected. As shown in fig. 4, the first two cycles of the refrigerator power-on start-up operation, the compressor is started and operated at the maximum allowable speed until the temperature controller is turned off.
After determining the starting rotating speed of the next operation period according to the operation parameters, the method further comprises the following steps: detecting whether the starting rotating speed of the next operating period is consistent with a preset rotating speed or not; and if the current running period is inconsistent with the preset running period, continuously detecting the load change condition of the current running period until the starting rotating speed of the next running period is consistent with the preset rotating speed.
And calculating the next starting running rotating speed parameter by using a preset press running time ts and a damping coefficient eta according to the recorded preset running time and the actual running time through an operational formula and circularly calculating according to the next starting running rotating speed parameter. The variable frequency compressor runs under a stable working condition, the running speed parameter fluctuation of the variable frequency compressor is small, the low-speed running utilization rate is high, and the purpose of saving energy of the whole machine is achieved. Under the condition that the working condition changes, the next starting rotating speed is adjusted through the operation parameters, so that the next starting rotating speed is closer to the condition and the preset operation rotating speed parameters until the preset operation rotating speed parameters are completely attached.
Example 2
Based on the compressor control method provided in the above embodiment 1, there is also provided a compressor control device in a preferred embodiment 2 of the present invention, and specifically, fig. 5 shows an alternative structural block diagram of the device, and as shown in fig. 5, the device includes:
a detecting module 502, configured to detect a load change condition of a current operating period;
a calculating module 504, connected to the detecting module 502, for determining the operation parameters of the current operation period according to the load change condition; wherein the operation parameters at least comprise operation time and operation rotating speed parameters;
a determining module 506, connected to the calculating module 504, is configured to determine a starting rotation speed of the next operation cycle according to the operation parameter.
In the above embodiment, a frequency conversion control method is provided, in which an operation parameter, such as an operation time and an operation rotation speed parameter, of a current operation cycle is determined according to a load change condition of the current operation cycle, and a start rotation speed of a next operation cycle is determined according to the operation parameter. The rotating speed parameter of the next starting operation is calculated in the mode and is circularly calculated according to the rotating speed parameter, the refrigerating capacity of the compressor is automatically compensated, the compressor stably operates at the required rotating speed under different environmental temperatures, and therefore the refrigerating efficiency of the compressor is improved, and the purposes of energy conservation and consumption reduction are achieved.
The load change situation at least comprises: load reduction and load increase; the runtime includes at least: an actual running time tp and a preset running time ts; the operating speed parameters at least include: the average value Vi of the rotational speed and the increment Va of the rotational speed.
When the load change condition is load reduction, the rotating speed of the compressor in the current operation period is RPM1, the operation time of the compressor at the rotating speed RPM1 is t1, the actual operation time tp is t1, and the average rotating speed Vi is RPM 1.
When the load change condition is load increase, the rotating speed of the compressor in the current operation period is RPM1 … RPMn, the operation time of the compressor at the rotating speed RPM1 … RPMn is t1 … tn, the actual operation time tp is t1+ … + tn, and the average rotating speed Vi is ((RPM1 t1) + … + (RPMn) t)/(t 1+ … + tn); wherein n is more than or equal to 2.
The calculation module 504 includes: the calculating unit is used for calculating the operation rate of the compressor in the current operation period; wherein the operation rate is the ratio of the actual operation time tp to the preset operation time ts; a determining unit for determining a rotation speed increment Va according to the operation rate; wherein, a corresponding relation table of the rotating speed increment Va and the operating rate is preset.
The determination module 506 includes: the starting rotational speed Vs for the next operating cycle is determined by the following formula: vs ═ Vi ═ ((η ═ ts-tp) + tp)/ts) + Va; wherein eta is a reduction coefficient.
Further, the apparatus further comprises: and the starting module is used for running at a preset maximum rotating speed until the temperature controller is disconnected after the compressor is powered on and started to run before the load change condition of the current running period is detected.
The adjusting module is used for detecting whether the starting rotating speed of the next operating period is consistent with the preset rotating speed or not after the starting rotating speed of the next operating period is determined according to the operating parameters; and if the starting rotating speed is not consistent with the preset rotating speed, repeating the compressor control method until the starting rotating speed of the next operation period is consistent with the preset rotating speed.
With regard to the apparatus in the above embodiments, the specific manner in which each unit and each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail herein.
Example 3
Based on the compressor control device provided in the above embodiment 2, there is also provided in a preferred embodiment 3 of the present invention a refrigeration apparatus including the compressor control device as described above.
In the above embodiment, a frequency conversion control method is provided, in which an operation parameter, such as an operation time and an operation rotation speed parameter, of a current operation cycle is determined according to a load change condition of the current operation cycle, and a start rotation speed of a next operation cycle is determined according to the operation parameter. The rotating speed parameter of the next starting operation is calculated in the mode and is circularly calculated according to the rotating speed parameter, the refrigerating capacity of the compressor is automatically compensated, the compressor stably operates at the required rotating speed under different environmental temperatures, and therefore the refrigerating efficiency of the compressor is improved, and the purposes of energy conservation and consumption reduction are achieved.
Example 4
Based on the compressor control method provided in embodiment 1 above, there is also provided in a preferred embodiment 4 of the present invention a storage medium containing computer-executable instructions for performing the compressor control method as described above when executed by a computer processor.
In the above embodiment, a frequency conversion control method is provided, in which an operation parameter, such as an operation time and an operation rotation speed parameter, of a current operation cycle is determined according to a load change condition of the current operation cycle, and a start rotation speed of a next operation cycle is determined according to the operation parameter. The rotating speed parameter of the next starting operation is calculated in the mode and is circularly calculated according to the rotating speed parameter, the refrigerating capacity of the compressor is automatically compensated, the compressor stably operates at the required rotating speed under different environmental temperatures, and therefore the refrigerating efficiency of the compressor is improved, and the purposes of energy conservation and consumption reduction are achieved.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (11)
1. A compressor control method, comprising:
detecting the load change condition of the current operation period;
determining the operation parameters of the current operation period according to the load change condition; wherein the operating parameters at least comprise an operating time parameter and an operating speed parameter;
and determining the starting rotating speed of the next operation period according to the operation parameters.
2. The method of claim 1, wherein the load change condition comprises at least: load reduction and load increase; the runtime parameters include at least: an actual running time tp and a preset running time ts; the operating speed parameters at least include: the average value Vi of the rotational speed and the increment Va of the rotational speed.
3. The method of claim 2, wherein determining the operating parameter for the current operating cycle based on the load change condition comprises:
when the load change condition is load reduction, the rotating speed of the compressor in the current operation period is RPM1, the operation time of the compressor at the rotating speed RPM1 is t1, the actual operation time tp is t1, and the average rotating speed Vi is RPM 1.
4. The method of claim 2, wherein determining the operating parameter for the current operating cycle based on the load change condition further comprises:
when the load change condition is load increase, the rotating speed of the compressor in the current operation period is RPM1 … RPMn, the running time of the compressor at the rotating speed RPM1 … RPMn is t1 … tn, the actual running time tp is t1+ … + tn, and the average rotating speed Vi is ((RPM1 t1) + … + (RPMn) tn))/(t1+ … + tn); wherein n is more than or equal to 2.
5. The method of claim 2, wherein determining the operating parameter for the current operating cycle based on the load change condition further comprises:
calculating the operation rate of the compressor in the current operation period; wherein the operation rate is a ratio of the actual operation time tp to the preset operation time ts; determining the rotation speed increment Va according to the operation rate; wherein, a corresponding relation table of the rotating speed increment Va and the operation rate is preset.
6. The method of claim 2, wherein determining a starting rotational speed for a next operating cycle based on the operating parameter comprises:
the starting rotational speed Vs of the next operating cycle is determined by the following formula:
vs ═ Vi ═ ((η ═ ts-tp) + tp)/ts) + Va; wherein eta is a reduction coefficient.
7. The method of claim 1, prior to detecting a load change condition for a current operating cycle, further comprising:
and after the compressor is electrified and started to operate, the compressor operates at a preset maximum rotating speed until the temperature controller is disconnected.
8. The method of claim 1, further comprising, after determining a starting rotational speed for a next operating cycle based on the operating parameter:
detecting whether the starting rotating speed of the next operating period is consistent with a preset rotating speed or not;
and if the current running period is inconsistent with the preset running period, continuously detecting the load change condition of the current running period until the starting rotating speed of the next running period is consistent with the preset rotating speed.
9. A compressor control apparatus, comprising:
the detection module is used for detecting the load change condition of the current operation period;
the calculation module is used for determining the operation parameters of the current operation period according to the load change condition; wherein the operating parameters at least comprise an operating time parameter and an operating speed parameter;
and the determining module is used for determining the starting rotating speed of the next operation period according to the operation parameters.
10. A refrigeration apparatus, characterized by comprising a compressor control device as claimed in claim 9.
11. A storage medium containing computer executable instructions for performing the compressor control method of any one of claims 1 to 8 when executed by a computer processor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112460910A (en) * | 2020-12-07 | 2021-03-09 | 珠海格力电器股份有限公司 | Control method of refrigerator compressor and refrigerator |
| CN113915917A (en) * | 2021-04-12 | 2022-01-11 | 海信（山东）冰箱有限公司 | Refrigerator, variable frequency compressor and control method thereof |
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