CN115342562B - Compressor control method for refrigerator and refrigerator - Google Patents

Abstract

The application provides a compressor control method for a refrigerator and the refrigerator. The compressor control method for the refrigerator includes: acquiring actual power and actual rotation speed of a compressor, and determining a rotation speed set value of the compressor; judging whether the actual power belongs to a preset limited frequency modulation power range or not; if yes, comparing the actual rotation speed of the compressor with a rotation speed set value; maintaining the actual rotation speed under the condition that the actual rotation speed is smaller than the rotation speed set value; in the case where the actual rotation speed is greater than or equal to the rotation speed set value, the rotation speed of the compressor is reduced with the rotation speed set value as a target value, and the speed reduction rate is configured as a first speed regulation rate. By applying the scheme of the application, the frequent start and stop of the compressor are avoided, the energy consumption efficiency of the refrigerator is improved, the frequency modulation of the compressor is smoother, and the reliability and stability of the refrigerator are greatly improved.

Description

Compressor control method for refrigerator and refrigerator

technical field

The invention relates to refrigerator control, in particular to a compressor control method and the refrigerator for the refrigerator.

Background technique

Inverter refrigerators refer to refrigerators that use inverter compressors. The speed of the inverter compressor is not fixed and can be adjusted according to the cooling state. Under the condition of high storage temperature, the speed of the compressor is increased to achieve the purpose of cooling down as soon as possible; under the condition of low temperature of the storage, the speed of the compressor is reduced to keep the temperature stable. The inverter refrigerator has low power consumption and good mute effect, which avoids the frequent start and stop of the compressor.

The safety protection mechanism of the compressor is to ensure the safe operation of the refrigerator. When the temperature of the motor or the temperature of the compressor itself exceeds a set temperature, the compressor is controlled to stop, so as to protect the compressor. However, such overheating protection measures may cause the compressor to start frequently, and even increase the wear and tear of the compressor in serious cases, reduce the service life of the compressor, and cause the reliability of the refrigerator to decline.

Contents of the invention

An object of the present invention is to provide a compressor control method for a refrigerator and a refrigerator that avoid frequent startup and shutdown of the compressor.

A further object of the present invention is to increase the energy efficiency of the refrigerator.

Another further object of the present invention is to make the frequency adjustment of the compressor smoother.

In particular, the present invention provides a compressor control method for a refrigerator, the control method comprising:

Obtain the actual power and actual speed of the compressor, and determine the set value of the compressor's speed;

Judging whether the actual power belongs to the preset limited FM power range;

If so, compare the actual speed of the compressor with the speed set value;

When the actual speed is lower than the set value of the speed, the actual speed is maintained;

In the case that the actual rotating speed is greater than or equal to the set value of the rotating speed, the rotating speed of the compressor is reduced with the set value of the rotating speed being the target value, and the speed reducing rate is configured as the first speed regulation rate.

Optionally, when the actual power is greater than the maximum value of the preset limited FM power range, it also includes:

Judging whether the actual power is greater than the preset power protection threshold, the power protection threshold is greater than the maximum value of the frequency modulation power range;

If so, reduce the rotation speed of the compressor, and the speed reduction rate is configured as the second speed regulation rate, and the second speed regulation rate is greater than the first speed regulation rate.

Optionally, when the actual power is greater than the power protection threshold, if the rotational speed setting value is less than the preset first low-speed threshold, the compressor is controlled to stop.

Optionally, when the actual power is greater than the maximum value of the frequency-adjusted power range, if the actual rotational speed of the compressor is less than a preset second low-speed threshold, the compressor is controlled to stop.

Optionally, after the step of controlling the shutdown of the compressor, the method further includes:

Restart the compressor after the set time, and count the number of restarts of the compressor;

After the number of restarts exceeds the threshold of the set number of times, the restart will be stopped and an alarm signal will be output; and when the actual power of the compressor in the continuous running state is less than the minimum value of the frequency regulation power range, the number of restarts will be cleared.

Optionally, in the case of judging that the actual power is less than the preset minimum value of the limited frequency regulation power range, the method further includes: adjusting the rotation speed of the compressor with the rotation speed set value as the target value.

Optionally, the step of adjusting the rotational speed of the compressor with the rotational speed setting value as a target value includes:

If the actual speed is less than the set value of the speed, the actual speed is increased at the third speed regulation rate;

If the actual speed is greater than the set value of the speed, the actual speed is reduced at a fourth speed regulation rate, wherein the third speed regulation rate is greater than the fourth speed regulation rate.

Optionally, the step of obtaining the actual power of the compressor includes:

Collect the power supply signal of the compressor, and calculate the actual power of the compressor according to the power supply signal.

Optionally, the step of determining the rotational speed setting value of the compressor includes:

Collect the operating parameters of the refrigerator;

Query the pre-configured corresponding table to obtain the corresponding speed setting value of the operating parameters. The operating parameters include the set freezing temperature of the refrigerator and the operating environment temperature of the refrigerator, and the corresponding table is pre-configured with the set freezing temperature, operating environment temperature and rotating speed. Correspondence of setting values.

According to another aspect of the present invention, there is also provided a refrigerator, which includes:

compressor; and

A controller, the controller includes a memory and a processor, wherein the memory stores a machine-executable program, and when the machine-executable program is executed by the processor, any one of the above compressor control methods for a refrigerator is realized.

In the compressor control method for refrigerators of the present invention and the refrigerator, when the actual power of the compressor is within the preset limited frequency modulation power range, the actual rotational speed of the compressor is compared with the rotational speed set value; when the actual rotational speed is less than In the case of the speed setting value, the actual speed is maintained; when the actual speed is greater than or equal to the speed setting value, the speed of the compressor is reduced with the speed setting value as the target value, and the speed reduction rate is configured as the first speed regulation rate. The limited frequency modulation power range can be set according to the normal operating power of the compressor, that is, the limited frequency modulation power range is a value range higher than the normal operating power of the compressor. Within the limited frequency modulation power range, the compressor speed is only allowed to be adjusted downwards, and the upward adjustment is prohibited, so as to avoid further increase of the compressor power.

Furthermore, the compressor control method and refrigerator used in refrigerators of the present invention further judge whether the actual power is greater than the preset power protection threshold when the actual power is greater than the maximum value of the preset limited frequency modulation power range. When the power is greater than the preset power protection threshold, the speed of the compressor is quickly reduced to avoid direct shutdown of the compressor.

Furthermore, the compressor control method for a refrigerator of the present invention and the refrigerator control the compressor to shut down according to the actual frequency of the compressor in an extreme state, so as to avoid serious failure of the compressor in an abnormal state.

Furthermore, the compressor control method and refrigerator used in the refrigerator of the present invention optimize the restart strategy after the compressor stops abnormally, and can restore the compressor to normal operation to a certain extent.

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic block diagram of a refrigerator according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a compressor control method for a refrigerator according to an embodiment of the present invention;

3 is a schematic diagram of a circuit for collecting voltage signals in a compressor control method for a refrigerator according to an embodiment of the present invention; and

Fig. 4 is a schematic diagram of a circuit for collecting current signals in a compressor control method for a refrigerator according to an embodiment of the present invention.

Detailed ways

The refrigerator in this embodiment can be a storage device with a refrigeration system to keep food or other storage items at a constant low temperature. The refrigerating system may be a common compression refrigerating system, which provides cold energy to the storage compartment through, for example, direct cooling and/or air cooling, so that the storage compartment has a desired preservation temperature.

The refrigeration system can be a refrigeration cycle system composed of a compressor, a condenser, a throttling device, and an evaporator. The evaporator is configured to directly or indirectly provide cooling to the storage compartment. Since the overall structure of the refrigerator and the refrigeration system itself are well-known and easy to implement by those skilled in the art, in order not to cover up and obscure the invention point of the present application.

FIG. 1 is a schematic block diagram of a refrigerator 10 according to one embodiment of the present invention. The refrigerator 10 of this embodiment may generally include a compressor 130 and a controller 100 .

The compressor 130, as the power of the refrigeration cycle, is driven and rotated by the motor, extracts the vapor in the evaporator, and increases the pressure and temperature of the refrigerant vapor through compression, creating conditions for transferring the heat of the refrigerant vapor to the external environment medium, and also That is, the low-temperature and low-pressure refrigerant vapor is compressed to a high-temperature and high-pressure state. The rotation speed of the compressor 130 can be adjusted through frequency conversion technology, and the frequency conversion board can adjust the rotation speed of the compressor 130 by changing the power supply frequency of the compressor 130 . That is, the power supply frequency is directly proportional to the rotation speed of the compressor 130 (the ratio is determined by the number of poles of the motor). For example, for an actually used frequency conversion compressor, its rotational speed n=30*f. Among them, f is the power supply frequency, which is controlled and adjusted by the frequency conversion board, and 60Hz corresponds to 1800 revolutions per second. The adjustment of the rotational speed of the compressor 130 can adjust the discharge capacity (refrigerant flow rate) accordingly, thereby further adjusting the cooling capacity.

The controller 100 includes a memory 120 and a processor 110, wherein the memory 120 stores a machine-executable program, and when the machine-executable program is executed by the processor 110, any compressor control method for a refrigerator in this embodiment is implemented. The machine-executable program for performing the method of this embodiment may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or in one or more Source or object code written in any combination of programming languages. The memory 120 may be a tangible device that can hold and store instructions used by the processor 110, and may be implemented by various computer-readable storage media. The processor 110 adopts an execution device with a certain data processing capability, such as a single-chip microcomputer, an embedded processor, a microprocessor, and the like.

FIG. 2 is a schematic diagram of a compressor control method for a refrigerator according to an embodiment of the present invention. The compressor control method for a refrigerator in this embodiment may generally include:

Step S202, obtaining the actual power and actual speed of the compressor, and determining the set value of the compressor's speed;

Step S204, judging whether the actual power belongs to the preset limited FM power range;

Step S206, when the actual power belongs to the preset limited frequency regulation power range (that is, when the actual power is greater than or equal to the minimum value of the limited frequency regulation power range and less than or equal to the maximum value of the limited frequency regulation power range), the actual speed of the compressor and the speed setting value for comparison;

Step S208, in the case that the actual speed is lower than the set value of the speed, maintain the actual speed;

Step S210, in the case that the actual rotational speed is greater than or equal to the rotational speed setting value, reduce the rotational speed of the compressor with the rotational speed setting value as the target value, and configure the deceleration rate as the first speed regulation rate.

In the method of this embodiment, when the actual power of the compressor is within the preset limited frequency modulation power range, the actual speed of the compressor is compared with the speed setting value; when the actual speed is less than the speed setting value, Maintain the actual speed; when the actual speed is greater than or equal to the set value of the speed, reduce the speed of the compressor with the set value of the speed as the target value, and configure the speed reduction rate as the first speed regulation rate.

The limited frequency modulation power range can be set according to the normal operating power of the compressor, that is, the limited frequency modulation power range is a value range higher than the normal operating power of the compressor. Within the range of the limited frequency modulation power, the compressor is only allowed to adjust downwards, but prohibits upward adjustments, so as to avoid further increase of the compressor power.

For example, for a compressor whose general operating power does not exceed 200W, the value range around 200W can be used as the limited frequency modulation power range, which can be specifically set to 197W to 204W. In the limited FM power range of 197W to 204W, the compressor can be considered as possibly over-powered. In this situation, the rotational speed of the compressor is only allowed to be adjusted downwards, and is forbidden to be adjusted upwards, so as to avoid further increase of the compressor power, so that the compressor can run stably. Further, the deceleration rate can be configured as the preset first speed regulation rate, for example, decrement by 5 revolutions every 200 ms, so as to ensure smooth adjustment of the compressor as much as possible. Under normal circumstances, the power of the compressor can be restored to the normal power range below the frequency regulation power range through a smooth frequency reduction.

It should be noted that the numerical values in this embodiment are only examples of specific application examples, and those skilled in the art can configure the corresponding numerical values according to the specifications of the compressor and other conditions.

Acquiring the actual power of the compressor in step S202 may be obtained by collecting the power supply signal of the compressor, which may include collecting the power supply signal of the compressor, and calculating the actual power of the compressor according to the power supply signal. The above electrical signals include voltage signals and current signals.

Fig. 3 is a schematic diagram of a circuit for collecting voltage signals in a compressor control method for a refrigerator according to an embodiment of the present invention, and Fig. 4 is a circuit diagram for collecting current signals in a compressor control method for a refrigerator according to an embodiment of the present invention The schematic diagram of the collected circuit.

According to the power calculation formula: power = voltage * current, the actual power of the compressor can be calculated from the power supply voltage and power supply current of the compressor. In order to improve the precision, both the voltage signal and the current signal can preferably adopt high-precision A/D sampling (for example, adopt 12-bit A/D conversion). In the voltage acquisition circuit, the OVP is used to connect an A/D converter to provide a voltage signal to the A/D converter. In the current acquisition circuit, I_line is used to connect another A/D converter to provide current signal to the A/D converter. A/D conversion can use the built-in A/D conversion function of the processor.

Under normal working conditions, the compressor is powered by a commercial frequency power supply, that is, it can generally be powered by a 220V AC power supply. After rectification and filtering, the voltage VDC is about 310V. After the series voltage division of R1, R2, R3, and R4, the voltage division signal output from OVP is about 2.5V. R5 and C1 are used for voltage regulation and current limiting respectively.

In the current signal acquisition circuit, I_shunt is connected to the common ends of the three lower bridge arms of the IGBT driving the compressor in the frequency converter VVVF to obtain the supply current signal. Due to the weak current signal, the current signal acquisition circuit is amplified by a discharge circuit composed of RS, R6, R7, R8, R9, R10, R11, C2 and operational amplifier OP. For example, an amplifying circuit with a magnification of 5 times can be configured. After being amplified by the amplifier, the current signal can be converted into a corresponding voltage for sampling by the A/D. For compressors whose power supply current generally does not exceed 5A, the current signal acquisition circuit can be configured to correspond to 2.5V voltage output when the current is 0, and correspond to 5V voltage output when the current is 5A. If the current exceeds 5A, it is considered to need overcurrent protection.

The voltage and current after sampling processing can be calculated by the processor to obtain the actual power.

The actual speed of the compressor can be determined according to the output frequency of the inverter, and the frequency is proportional to the speed of the compressor (the ratio is determined by the number of poles of the motor). For example, the rotational speed of an actually used frequency conversion compressor is n=30*f, where f is the power supply frequency, which is controlled and adjusted by the frequency conversion board, and 60 Hz corresponds to 1800 revolutions per second.

The rotational speed setting value of the compressor is generally set according to the cooling state of the refrigerator. As the rotational speed of the compressor changes, the cooling capacity changes accordingly. Therefore, the cooling capacity can be provided by increasing the rotational speed of the compressor when the compressor is operating normally. In this embodiment, the step of determining the rotational speed setting value of the compressor may include: collecting operating parameters of the refrigerator; querying a pre-configured correspondence table to obtain the rotational speed setting value corresponding to the operating parameters, and the operating parameters may include refrigerator setting The freezing temperature and the operating environment temperature of the refrigerator are set, and the correspondence table is pre-configured with the corresponding relationship between the setting freezing temperature, the operating environment temperature and the set value of the rotating speed.

Table 1 is a specific example of the corresponding table in the compressor control method for a refrigerator in this embodiment.

Table 1

It can be seen from Table 1 that with the increase of the ambient temperature RT and the decrease of the freezing set temperature, the cooling capacity required by the refrigerator increases, and the speed of the compressor can be increased accordingly. Correspondingly, as the ambient temperature RT decreases and the freezing set temperature increases, the cooling capacity required by the refrigerator decreases, and at this time, the rotational speed of the compressor can be reduced accordingly. The numerical values in the table are only examples, and those skilled in the art can configure corresponding numerical values according to the specifications of the compressor and the refrigerator.

The set speed shown in Table 1 is the way to adjust the compressor power within the normal operating range. For compressors whose general operating power does not exceed 200W, the power range of less than 197W can be regarded as the normal operating range. Within this operating range, when there is a deviation between the actual speed of the compressor and the set speed, it can be adjusted accordingly.

That is to say, in the case of judging that the actual power is less than the preset minimum value of the limited frequency regulation power range, the rotational speed of the compressor can also be adjusted at the target value of the rotational speed setting value. Specifically, if the actual speed is less than the set value of the speed, the actual speed is increased at the third speed regulation rate; if the actual speed is greater than the speed setting value, the actual speed is reduced at the fourth speed regulation rate, wherein the third speed regulation rate is greater than the fourth Speed regulation rate, that is, the speed-up rate can be greater than the speed-down rate. For example, when the speed is increased, the third speed regulation rate can be increased by 5 revolutions every 200 milliseconds, and the fourth speed regulation rate can be decreased by 2 revolutions every 200 milliseconds. Such an adjustment method can make the compressor run more smoothly and avoid excessive loss caused by excessive speed adjustment. Wherein the third speed regulation rate is greater than the fourth speed regulation speed, which can be more in line with the operating characteristics of the compressor, and is beneficial to reduce the energy consumption of the compressor.

When the actual power is greater than the maximum value of the preset limited frequency modulation power range, it can further determine whether the actual power is greater than the preset power protection threshold, and if the actual power is greater than the power protection threshold, directly reduce the speed of the compressor. The power protection threshold is greater than the maximum value of the limited frequency modulation power range, which can be configured in advance according to the test. For example, for a compressor whose general operating power does not exceed 200W, when the limited frequency modulation power range is set to 197W to 204W, the power protection threshold can be Set to 210W. That is, once the actual power of the compressor exceeds 210W, the power of the compressor is directly reduced by reducing the speed. In this case, the speed reduction rate is configured as the second speed regulation rate, and the second speed regulation rate is greater than the first speed regulation rate, and the state of the compressor is stabilized through rapid frequency reduction. For example, you can reduce 8 revolutions every 200 milliseconds, and try to reduce the power of the compressor without stopping the machine.

When the actual power is greater than the power protection threshold, if the rotational speed setting value is lower than the preset first low-speed threshold, the compressor is controlled to stop. The first low speed threshold may be pre-configured based on compressor operating conditions. For example, for the compressor shown in Table 1, it can be set to 1800 revolutions. If the actual rotational speed of the compressor is lower than the first low-speed threshold but the actual power is still greater than the power protection threshold, it can be considered that the compressor is abnormal, and it can be stopped directly at this time.

In the case that the actual power is greater than the maximum value of the frequency-adjusted power range, if the actual rotational speed of the compressor is less than the preset second low-speed threshold, the compressor may also be controlled to stop. The second low-speed threshold can also be pre-configured according to the operating conditions of the compressor, and it can be set to be the same as or different from the first low-speed threshold. For example, for the compressor shown in Table 1, it can also be set to 1800 revolutions. In this case, it can be considered that no further speed reduction is required, so that the compressor can be stopped directly.

The aforementioned forced shutdown only occurs when it is determined that the compressor is in an abnormal state. That is to say, the compressor will be forced to stop only in extreme conditions, and its protection shutdown rate is much lower than the existing compressor protection measures, thereby reducing the loss of the compressor and improving the reliability of the compressor.

After controlling the compressor to stop, it is also possible to restart the compressor after a set time, and count the number of restarts of the compressor; when the number of restarts exceeds the threshold of the set number of times, stop restarting the compressor and output an alarm signal; and when compression occurs When the actual power in the continuous running state of the machine is less than the minimum value of the frequency regulation power range, the number of restarts will be cleared. For example, when the compressor is forced to stop due to power exceeding the limit, the compressor can be restarted after a set time (can be set to 10s to 50s, such as 30s), and the fault can be eliminated by automatic restart.

If after restarting, the number of times the compressor is forced to stop due to power exceeding the limit exceeds the number threshold (can be set to 2 to 10 times, for example, 5 times), it can be considered that the compressor cannot be automatically restarted to eliminate the fault, and stop at this time Restart the compressor and output an alarm signal for timely maintenance. If the abnormality of the compressor is eliminated by restarting, that is, the actual power of the compressor runs stably within the value range below the minimum value of the frequency regulation power range, then the number of restarts can be cleared to restore the normal operation of the compressor.

For a specific example, the control logic of the above compressor control method is introduced below. For example, for a specific compressor whose normal operating power does not exceed 200W, the limited frequency modulation power range is set to 197W to 204W, the power protection threshold is set to 210W, and the speed setting value is shown in Table 1, the control logic can be:

If the actual power of the compressor exceeds 210W, the compressor starts to decelerate, and the deceleration speed is 8 revolutions every 200 milliseconds. If the speed setting value set at this time is lower than 1800 rpm, it can be considered that the compressor does not need to continue to reduce the speed, and the compressor can be directly controlled to stop.

In the process of reducing the speed of the compressor, if the actual power is less than 204W, enter the limited frequency modulation power range (197W to 204W). If the actual rotational speed of the compressor is lower than 1800 revolutions, the task compressor can also be controlled without continuing to reduce the speed, and the compressor can be directly controlled to stop.

If the above forced compressor shutdown occurs, you can try to restart the compressor after 30 seconds. If the compressor has been forced to stop due to power overrun more than 5 times, it will no longer try to restart.

When the abnormal state of the compressor is eliminated by restarting, that is, after the compressor is restarted, the actual power is stable below 197W, then the number of restarts can be cleared to restore the normal operation of the compressor.

Within the limited frequency modulation power range of 197W to 204W, if the set speed of the compressor is lower than the actual speed, it will decrease by 5 revolutions every 200 milliseconds until it reaches the set speed of the compressor. If the set speed is much higher than the actual speed, the actual speed will be maintained and the speed will not be increased.

When the actual power of the compressor returns to below 197W, adjust the speed of the compressor with the speed setting value as the target value. When the speed needs to be increased, it will be increased by 5 revolutions every 200 milliseconds; when the speed needs to be reduced, it will be reduced by 2 revolutions every 200 milliseconds.

It should be noted that the numerical values in this embodiment are only examples, and those skilled in the art can configure corresponding numerical values according to the specifications of the compressor and actual test results.

In the compressor control method used in refrigerators in this embodiment, when the power of the compressor is slightly higher and reaches the limited frequency modulation power range, the speed of the compressor is limited to avoid further increase of the power of the compressor and maintain the stable operation of the compressor. Avoid the direct shutdown of the compressor, greatly reducing the number of abnormal startup and shutdown of the compressor. By optimizing the restart strategy after the compressor stops abnormally, the compressor can be restored to normal operation to a certain extent. At the same time, when the compressor cannot automatically return to normal, stop and restart the compressor to avoid deterioration of the fault and facilitate timely maintenance.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A compressor control method for a refrigerator, comprising:

acquiring the actual power and the actual rotating speed of the compressor, and determining a rotating speed set value of the compressor;

judging whether the actual power belongs to a preset limited frequency modulation power range or not;

if so, comparing the actual rotation speed of the compressor with the rotation speed set value;

maintaining the actual rotational speed when the actual rotational speed is less than the rotational speed set point;

when the actual rotation speed is greater than or equal to the rotation speed set value, the rotation speed of the compressor is reduced by taking the rotation speed set value as a target value, and the speed reduction rate is configured to be a first speed regulation rate;

and the limited frequency modulation power range is set according to the normal running power of the compressor, and is a numerical range higher than the normal running power of the compressor, and in the limited frequency modulation power range, the compressor only allows down regulation and prohibits up regulation.

2. The compressor control method for a refrigerator according to claim 1, wherein

And under the condition that the actual power is larger than the maximum value of the preset limit frequency modulation power range, the method further comprises the following steps:

judging whether the actual power is larger than a preset power protection threshold value or not, wherein the power protection threshold value is larger than the maximum value of the frequency modulation limiting power range;

if so, the rotational speed of the compressor is reduced, and the rate of reduction is configured to be a second rate of speed, and the second rate of speed is greater than the first rate of speed.

3. The compressor control method for a refrigerator according to claim 2, wherein

And if the actual power is larger than the power protection threshold, controlling the compressor to stop if the rotation speed set value is smaller than a preset first low-speed threshold.

4. The compressor control method for a refrigerator according to claim 2, wherein

And if the actual power is larger than the maximum value of the limit frequency modulation power range, if the actual rotating speed of the compressor is smaller than a preset second low-speed threshold value, controlling the compressor to stop.

5. The compressor control method for a refrigerator according to claim 3 or 4, wherein after the step of controlling the compressor to stop, further comprising:

restarting the compressor after the set time, and counting the restarting times of the compressor;

stopping restarting and outputting an alarm signal after the restarting times exceed a set time threshold; and the restart times are cleared after the condition that the actual power of the compressor in the continuous running state is smaller than the minimum value of the limit frequency modulation power range occurs.

6. The compressor control method for a refrigerator according to claim 1, wherein

And under the condition that the actual power is less than the minimum value of the preset limit frequency modulation power range, the method further comprises the following steps: and adjusting the rotating speed of the compressor by taking the rotating speed set value as a target value.

7. The compressor control method for a refrigerator of claim 6, wherein

The step of adjusting the rotation speed of the compressor by taking the rotation speed set value as a target value comprises the following steps:

if the actual rotating speed is smaller than the rotating speed set value, the actual rotating speed is increased at a third speed regulation rate;

and if the actual rotating speed is larger than the rotating speed set value, reducing the actual rotating speed at a fourth speed regulating rate, wherein the third speed regulating rate is larger than the fourth speed regulating rate.

8. The compressor control method for a refrigerator according to claim 1, wherein the step of obtaining the actual power of the compressor comprises:

and collecting a power supply signal of the compressor, and calculating the actual power of the compressor according to the power supply signal.

9. The compressor control method for a refrigerator according to claim 1, wherein the step of determining a rotational speed set value of the compressor comprises:

collecting operation parameters of the refrigerator;

inquiring a pre-configured corresponding table to obtain the rotating speed set value corresponding to the operating parameter, wherein the operating parameter comprises the set freezing temperature of the refrigerator and the operating environment temperature of the refrigerator, and the corresponding table is pre-configured with the corresponding relation between the set freezing temperature, the operating environment temperature and the rotating speed set value.

10. A refrigerator, comprising:

a compressor; and

a controller including a memory and a processor, wherein the memory stores a machine executable program which when executed by the processor implements the compressor control method for a refrigerator according to any one of claims 1 to 9.