CN115342562B - Compressor control method for refrigerator and refrigerator - Google Patents
Compressor control method for refrigerator and refrigerator Download PDFInfo
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- CN115342562B CN115342562B CN202110521996.0A CN202110521996A CN115342562B CN 115342562 B CN115342562 B CN 115342562B CN 202110521996 A CN202110521996 A CN 202110521996A CN 115342562 B CN115342562 B CN 115342562B
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
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
Technical Field
The present application relates to refrigerator control, and more particularly, to a compressor control method for a refrigerator and a refrigerator.
Background
The inverter refrigerator refers to a refrigerator using an inverter compressor. The rotation speed of the variable frequency compressor is not fixed and can be adjusted according to the refrigerating state. Under the working condition of higher storage temperature, the rotating speed of the compressor is increased, so that the aim of reducing the temperature as soon as possible is fulfilled; under the working condition of lower storage temperature, the rotating speed of the compressor is reduced, and the temperature can be kept stable. The variable frequency refrigerator has low power consumption and good mute effect, and frequent start and stop of the compressor are avoided.
The safety protection mechanism of the compressor is used for ensuring the safe operation of the refrigerator, and when the temperature of the motor or the temperature of the compressor exceeds a set temperature, the compressor is controlled to stop, so that the effect of protecting the compressor is achieved. However, this overheat protection measure causes frequent starting of the compressor, and even increases the wear of the compressor when severe, reducing the service life of the compressor, resulting in a decrease in the reliability of the refrigerator.
Disclosure of Invention
An object of the present application is to provide a compressor control method for a refrigerator and a refrigerator which avoid frequent start and stop of a compressor.
A further object of the present application is to improve the energy consumption efficiency of a refrigerator.
It is a further object of the present application to provide a compressor with smoother modulation.
In particular, the present application provides a compressor control method for a refrigerator, the control method comprising:
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.
Optionally, in the case that the actual power is greater than the maximum value of the preset limited frequency modulation power range, the method further includes:
judging whether the actual power is larger than a preset power protection threshold value, wherein the power protection threshold value is larger than the maximum value of the frequency modulation limiting power range;
if so, the speed of the compressor is reduced and the rate of speed reduction is configured to be a second rate of speed, and the second rate of speed is greater than the first rate of speed.
Optionally, in the case that the actual power is greater than the power protection threshold, if the rotation speed set value is smaller than a preset first low speed threshold, the compressor is controlled to stop.
Alternatively, in the case where the actual power is greater than the maximum value of the limit frequency modulation power range, if it occurs that the actual rotational speed of the compressor is less than the preset second low speed threshold, the compressor is controlled to stop.
Optionally, 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 after the condition that the actual power of the compressor in the continuous running state is smaller than the minimum value of the limited frequency modulation power range occurs, the restarting times are cleared.
Optionally, in the case that the actual power is determined to be less than the minimum value of the preset limited frequency modulation power range, the method further includes: and adjusting the rotation speed of the compressor by taking the rotation speed set value as a target value.
Optionally, the step of adjusting the rotation speed of the compressor with the rotation speed set value as the target value includes:
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 speed, wherein the third speed regulating speed is larger than the fourth speed regulating speed.
Optionally, 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.
Optionally, the step of determining the rotational speed setting of the compressor comprises:
collecting operation parameters of a refrigerator;
inquiring a preset corresponding table to obtain a 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 preset with the corresponding relation between the set freezing temperature, the operating environment temperature and the rotating speed set value.
According to another aspect of the present application, there is also provided a refrigerator including:
a compressor; and
and a controller including a memory and a processor, wherein the memory stores a machine executable program that when executed by the processor implements any one of the above compressor control methods for the refrigerator.
According to the compressor control method for the refrigerator and the refrigerator, when the actual power of the compressor is in the preset limit frequency modulation power range, the actual rotating speed of the compressor is compared with the rotating 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. The limit frequency modulation power range may be set according to the normal operation power of the compressor, i.e., the limit frequency modulation power range is a numerical range higher than the normal operation power of the compressor. In this limited modulated power range, the compressor speed is only allowed to be turned down, while an up-regulation is prohibited, thereby avoiding further increases in compressor power.
Further, the control method of the compressor for the refrigerator and the refrigerator further judge whether the actual power is larger than a preset power protection threshold or not under the condition that the actual power is larger than the maximum value of the preset limit frequency modulation power range, and rapidly reduce the rotating speed of the compressor when the actual power is larger than the preset power protection threshold so as to avoid direct stop of the compressor.
Furthermore, the control method of the compressor for the refrigerator and the refrigerator control the compressor to stop according to the actual frequency of the compressor in an extreme state, so that serious faults of the compressor in an abnormal state are avoided.
Furthermore, the control method of the compressor for the refrigerator and the refrigerator optimize the restarting strategy after the abnormal shutdown of the compressor, so that the compressor can be restored to normal operation to a certain extent.
The above, as well as additional objectives, advantages, and features of the present application will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present application when read in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the application will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a schematic block diagram of a refrigerator according to an embodiment of the present application;
fig. 2 is a schematic view of a compressor control method for a refrigerator according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of voltage signal acquisition in a compressor control method for a refrigerator according to an embodiment of the present application; and
fig. 4 is a schematic circuit diagram of current signal acquisition in a compressor control method for a refrigerator according to an embodiment of the present application.
Detailed Description
The refrigerator of the embodiment can be a storage device with a refrigerating system, so that food or other storage objects can be kept in a constant low-temperature state. The refrigeration system may be a conventional compression refrigeration system that provides refrigeration to the storage compartment, for example, in the form of direct cooling and/or air cooling, to provide the storage compartment with a desired storage temperature.
The refrigeration system may be a refrigeration cycle system composed of a compressor, a condenser, a throttle device, an evaporator, and the like. The evaporator is configured to provide cooling directly or indirectly to the storage compartment. Since the overall structure of the refrigerator, the refrigeration system itself is well known to those skilled in the art and is easy to implement, the inventive aspects of the present application are not masked and obscured.
Fig. 1 is a schematic block diagram of a refrigerator 10 according to one embodiment of the present application. The refrigerator 10 of the present embodiment may generally include a compressor 130 and a controller 100.
The compressor 130 is driven by a motor to rotate as power of the refrigeration cycle, extracts vapor in the evaporator, and increases pressure and temperature of the refrigerant vapor through compression, thereby creating a condition for transferring heat of the refrigerant vapor to an external environment medium, i.e., compressing the low-temperature low-pressure refrigerant vapor to a high-temperature high-pressure state. The rotation speed of the compressor 130 can be adjusted by a 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. I.e. the frequency of the power supply is proportional to the rotational speed of the compressor 130 (the ratio being determined by the number of electrodes of the motor). For example, for a practical inverter compressor, the rotation speed n=30×f. Wherein f is the power supply frequency and is controlled and regulated by the frequency conversion board, and 60Hz corresponds to 1800 revolutions per second. The rotation speed adjustment of the compressor 130 may adjust the discharge amount (refrigerant flow rate) accordingly, thereby further adjusting the cooling amount.
The controller 100 includes a memory 120 and a processor 110, wherein the memory 120 stores a machine executable program that when executed by the processor 110 implements any one of the compressor control methods for a refrigerator of the present embodiment. The machine-executable program used to perform the methods of the present embodiments may be assembly instructions, instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages. Memory 120 may be a tangible device that may hold and store instructions for use by processor 110 and may be implemented by various computer-readable storage media. The processor 110 employs an execution device having a certain data processing capability, such as a single-chip microcomputer, an embedded processor, a microprocessor, etc.
Fig. 2 is a schematic view of a compressor control method for a refrigerator according to an embodiment of the present application. The compressor control method for a refrigerator of the present embodiment may generally include:
step S202, obtaining the actual power and the actual rotation speed of a compressor, and determining a rotation speed set value of the compressor;
step S204, judging whether the actual power belongs to a preset limit frequency modulation power range;
step S206, comparing the actual rotation speed of the compressor with the rotation speed set value when the actual power belongs to the preset limit frequency modulation power range (namely, when the actual power is more than or equal to the minimum value of the limit frequency modulation power range and less than or equal to the maximum value of the limit frequency modulation power range);
step S208, maintaining the actual rotation speed under the condition that the actual rotation speed is smaller than the rotation speed set value;
in step S210, in the case that 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 the target value, and the speed reduction rate is configured as the first speed regulation rate.
In the method of the embodiment, under the condition that the actual power of the compressor is in a preset limit frequency modulation power range, comparing the actual rotating speed of the compressor with a rotating 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.
The limit frequency modulation power range may be set according to the normal operation power of the compressor, i.e., the limit frequency modulation power range is a numerical range higher than the normal operation power of the compressor. Within this limited modulated power range, the compressor is only allowed to turn down, while an up-turn is prohibited, thereby avoiding further increases in compressor power.
For example, for a compressor whose general operation power does not exceed 200W, a numerical range around 200W may be used as the limit frequency modulation power range, and specifically 197W to 204W may be set. Within the limited frequency modulated power range of 197W to 204W, the compressor may be considered to be potentially overrun in power. In this case, the rotation speed of the compressor is only allowed to be adjusted down, but is prohibited from being adjusted up, thereby avoiding further increase in the compressor power, so that the compressor can be stably operated. Further, the deceleration rate may be configured to a preset first deceleration rate, for example, 5 revolutions per 200ms, to ensure as smooth adjustment of the compressor as possible. In general, by smooth down-conversion, the compressor power can be restored to a normal power range below the limited frequency modulation power range.
It should be noted that, in the present embodiment, the exemplary values are only exemplified as specific application examples, and those skilled in the art may configure the corresponding values according to the specifications of the compressor and the like.
The obtaining the actual power of the compressor in step S202 may be obtained by collecting a 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 electrical signal includes a voltage signal and a current signal.
Fig. 3 is a schematic circuit diagram of voltage signal acquisition in a compressor control method for a refrigerator according to an embodiment of the present application, and fig. 4 is a schematic circuit diagram of current signal acquisition in a compressor control method for a refrigerator according to an embodiment of the present application.
According to the calculation formula of the power: power = voltage = current, the actual power of the compressor can be calculated from the supply voltage and supply current of the compressor. To improve accuracy, both the voltage signal and the current signal may preferably be sampled with high accuracy a/D (e.g., using 12-bit a/D conversion). In the voltage acquisition circuit, the OVP is used to connect one a/D converter, thereby providing a voltage signal to the a/D converter. In the current acquisition circuit, the I_line is used for connecting with the other path of A/D converter, so as to provide a current signal for the A/D converter. The a/D conversion may use a built-in a/D conversion function of the processor.
Under a general working condition, the compressor is powered by an industrial frequency power supply, namely, 220V alternating current power supply can be generally adopted for power supply, and the voltage VDC is about 310V after rectification and filtration. The divided signal output from the OVP is about 2.5V through the series divided voltages of R1, R2, R3, R4. R5 and C1 are respectively used for stabilizing and limiting current.
In the current signal acquisition circuit, the I_shot is connected with a common end of three lower bridge arms of an IGBT driving a compressor in a frequency converter VVF to obtain a power supply current signal. Since the current signal is weak, the current signal acquisition circuit amplifies by using a discharge circuit composed of RS, R6, R7, R8, R9, R10, R11, C2 and an operational amplifier OP, for example, an amplification circuit with 5 times of amplification factor may be provided. The current signal can be converted into corresponding voltage for A/D sampling after the amplification processing of the amplifier. For compressors where the supply current generally does not exceed 5A, the current signal acquisition circuit may be configured to correspond to a 2.5V voltage output when the current is 0 and to a 5V voltage output when the current is 5A. If the current exceeds 5A, then overcurrent protection is deemed necessary.
The voltage and current after sampling can be calculated by the processor to obtain the actual power.
The actual rotational speed of the compressor may be determined based on the output frequency of the inverter, the frequency being proportional to the rotational speed of the compressor (the ratio being determined by the number of electrodes of the motor). For example, for a practical inverter compressor, the rotational speed n=30×f, f is the power supply frequency, and is controlled and adjusted by the inverter board, and 60Hz corresponds to 1800 revolutions per second.
The rotation speed set value of the compressor is generally set according to the refrigerating state of the refrigerator, and the refrigerating capacity is correspondingly changed due to the change of the rotation speed of the compressor, so that the refrigerating capacity can be provided by increasing the rotation speed of the compressor during normal operation of the compressor. In this embodiment, the step of determining the rotation speed set point of the compressor may include: collecting operation parameters of a refrigerator; and inquiring a preset corresponding table to obtain a rotating speed set value corresponding to the operating parameter, wherein the operating parameter can comprise the set freezing temperature of the refrigerator and the operating environment temperature of the refrigerator, and the corresponding table is preset with the corresponding relation between the set freezing temperature, the operating environment temperature and the rotating speed set value.
Table 1 is a specific example of a correspondence table in the compressor control method for a refrigerator of the present embodiment.
TABLE 1
As can be seen from table 1, as the ring temperature RT increases and the freezing set temperature decreases, the amount of cooling required for the refrigerator increases, and at this time, the rotation speed of the compressor can be increased accordingly. Correspondingly, as the ring temperature RT decreases and the freezing set temperature increases, the refrigerating capacity required by the refrigerator decreases, and at this time, the rotation speed of the compressor can be correspondingly reduced. The values in the table are only examples, and those skilled in the art can configure the corresponding values according to the specifications of the compressor and the refrigerator.
The set rotational speed shown in table 1 is a manner of adjusting the compressor power in the normal operation range. For a compressor with a normal operating power of not more than 200W, a power range of less than 197W may be used as a normal operating range, and in this operating range, when a deviation occurs between the actual rotational speed of the compressor and the set rotational speed, the actual rotational speed may be adjusted accordingly.
That is, in the case where it is determined that the actual power is smaller than the minimum value of the preset limit frequency modulation power range, the rotation speed of the compressor may be adjusted with the rotation speed set value as the target value. Specifically, if the actual rotation speed is smaller than the rotation speed set value, the actual rotation speed is increased at a third speed regulation rate; if the actual rotational speed is greater than the rotational speed set point, the actual rotational speed is reduced at a fourth pacing rate, wherein the third pacing rate is greater than the fourth pacing rate, i.e., the ramp-up rate may be greater than the ramp-down rate. For example, the third pacing rate may be 5 revolutions per 200 milliseconds while the rotational speed is increased, and the fourth pacing rate may be 2 revolutions per 200 milliseconds. By the adjusting mode, the compressor can run more smoothly, and excessive loss caused by too fast speed regulation is avoided. The third speed regulation rate is larger than the fourth speed regulation rate, so that the running characteristics of the compressor can be more met, and the energy consumption of the compressor can be reduced.
And under the condition that the actual power is larger than the maximum value of the preset limiting frequency modulation power range, further judging whether the actual power is larger than a preset power protection threshold value, and if the actual power is larger than the power protection threshold value, directly reducing the rotating speed of the compressor. The power protection threshold is greater than the maximum value of the limited chirped power range, which may be configured in advance according to a test, for example, for a compressor with a general operating power of not more than 200W, where the limited chirped power range is set to 197W to 204W, the power protection threshold may be set to 210W. I.e. the compressor power is reduced directly by a deceleration as soon as the actual power of the compressor exceeds 210W. In this case, the falling rate is configured to be a second regulation rate, and the second regulation rate is greater than the first regulation rate, and the state of the compressor is stabilized by rapid frequency falling. For example, the power of the compressor can be reduced by 8 turns every 200 milliseconds as much as possible without stopping the machine.
And under the condition that the actual power is larger than the power protection threshold, if the rotating speed set value is smaller than a preset first low-speed threshold, controlling the compressor to stop. The first low speed threshold may be preconfigured according to the operating conditions of the compressor. For example, for the compressor shown in table 1, 1800 revolutions may be set. If the actual rotational speed of the compressor is below the first low speed threshold and the actual power is still above the power protection threshold, the compressor may be considered abnormal and may be shut down directly.
In case the actual power is greater than the maximum value of the limited modulated power range, the compressor shutdown may also be controlled if it occurs that the actual rotational speed of the compressor is less than a preset second low speed threshold. The second low speed threshold may also be preconfigured according to the operation of the compressor, and may be set to be the same as or different from the first low speed threshold. For example, for the compressor shown in table 1, 1800 revolutions may be set as well. In this case, it is considered that no further deceleration is required, so that the compressor can be directly stopped.
The forced stoppage occurs only in the case where it is determined that the abnormal state of the compressor occurs. Namely, the compressor can be forcibly stopped only in an extreme state, and the protection stop rate is greatly lower than that of the existing compressor protection measures, so that the loss of the compressor is reduced, and the reliability of the compressor is improved.
After the compressor is controlled to stop, the compressor can be restarted after a set time, and the restarting times of the compressor are counted; stopping restarting the compressor and outputting an alarm signal after the restarting times exceed a set time threshold; and after the condition that the actual power of the compressor in the continuous running state is smaller than the minimum value of the limited frequency modulation power range occurs, the restarting times are cleared. For example, when the compressor is forcibly stopped due to an overrun of power, the compressor may be restarted after a set time (which may be set to 10s to 50s, for example, 30 s), and the fault is removed by automatic restart.
If the number of times the compressor is repeatedly forcibly stopped due to the power overrun exceeds a threshold number of times (may be set to 2 to 10 times, for example, 5 times) after the restart, it may be considered that the compressor has failed to be removed by the automatic restart, at which time the restart of the compressor is stopped, and an alarm signal may be output for timely maintenance. If the abnormality of the compressor is eliminated through restarting, that is, the actual power of the compressor stably runs in a numerical range below the minimum value of the limited frequency modulation power range, the restarting times can be cleared, and the normal operation of the compressor is restored.
The control logic of the above compressor control method is described below for one specific example. For example, for a specific compressor with a normal operating power of no more than 200W, a limited fm power range of 197W to 204W, a power protection threshold of 210W, and a rotational speed set point as shown in table 1, the control logic may be:
if the actual power of the compressor exceeds 210W, the compressor starts to slow down, and the speed is reduced by 8 revolutions every 200 milliseconds. If the set rotation speed is lower than 1800 revolutions, the compressor can be considered not to continue to reduce the speed, and the compressor can be directly controlled to stop.
During the compressor deceleration, if the actual power is less than 204W, the limited frequency modulated power range (197W to 204W) is entered. If the actual rotation speed of the compressor is lower than 1800 revolutions, the compressor can be directly controlled to stop without continuously reducing the speed.
If the forced compressor shutdown situation described above occurs, an attempt may be made to restart the compressor after 30 seconds. If the compressor is repeatedly forcibly stopped more than 5 times due to power overrun, restart is not attempted.
When the abnormal state of the compressor is eliminated by restarting, that is, after the compressor is restarted, the actual power is stabilized below 197W, the restarting times can be cleared, and the normal operation of the compressor is restored.
In the limited frequency modulation power range of 197W to 204W, if the set rotation speed of the compressor is less than the actual rotation speed, 5 rotations are reduced every 200 milliseconds until the set rotation speed of the compressor is reached. If the set rotation speed is larger than the actual rotation speed, the actual rotation speed is maintained, and the speed is not increased.
And when the actual power of the compressor is recovered to be less than 197W, the rotation speed of the compressor is adjusted by taking the rotation speed set value as a target value. When the speed is required to be increased, 5 turns are increased every 200 milliseconds; when a deceleration is required, 2 revolutions per 200 milliseconds are reduced.
It should be noted that the values in the present embodiment are merely examples, and those skilled in the art may configure the corresponding values according to the specifications of the compressor and the actual test results.
According to the control method for the refrigerator compressor, when the power of the compressor is slightly high and the frequency modulation power range is limited, the speed of the compressor is limited to prevent the power of the compressor from further increasing, the compressor is maintained to stably run, the direct stop of the compressor is avoided as much as possible, and the abnormal start and stop times of the compressor are greatly reduced. The restarting strategy after the abnormal shutdown of the compressor is optimized, so that the compressor can be restored to normal operation to a certain extent. And meanwhile, when the compressor cannot automatically recover to be normal, the restarting of the compressor is stopped, so that the failure is prevented from deteriorating, and the timely maintenance is facilitated.
By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the application have been shown and described herein in detail, many other variations or modifications of the application consistent with the principles of the application may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the application. Accordingly, the scope of the present application 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.
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| CN202110521996.0A CN115342562B (en) | 2021-05-13 | 2021-05-13 | Compressor control method for refrigerator and refrigerator |
| PCT/CN2021/139645 WO2022237172A1 (en) | 2021-05-13 | 2021-12-20 | Compressor control method for refrigerator and refrigerator |
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| CN202110521996.0A CN115342562B (en) | 2021-05-13 | 2021-05-13 | Compressor control method for refrigerator and refrigerator |
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| CN115342562B true CN115342562B (en) | 2023-08-15 |
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| WO (1) | WO2022237172A1 (en) |
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|---|---|
| WO2022237172A1 (en) | 2022-11-17 |
| CN115342562A (en) | 2022-11-15 |
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