A refrigeration system and a control method, device and equipment thereof and a storage medium

Abstract

The present disclosure provides a refrigeration system and a control method, device and equipment thereof and a storage medium, belonging to the technical field of refrigeration control, and solves the problems of inaccurate control of the operating parameters of the refrigeration system and high energy consumption; the control method comprises: acquiring the mass of the goods stored in the chamber of the refrigeration equipment, the temperature in the chamber and the ambient temperature of the refrigeration equipment; determining the optimal operating frequency of the compressor according to the mass of the goods and the temperature in the chamber; and determining the optimal opening degree of the electronic expansion valve according to the optimal operating frequency and the ambient temperature, so as to more accurately control the operating parameters of the refrigeration system and reduce energy consumption.

Description

Technical Field

[0001] This disclosure relates to the field of refrigeration control technology, and in particular to a refrigeration system and its control method, apparatus, equipment and storage medium. Background Technology

[0002] Currently, in the operation of refrigeration equipment such as refrigerators and freezers, the operating parameters of the refrigeration system are usually controlled by the temperature inside the refrigeration unit. Taking the compressor in the refrigeration system as an example, when the temperature inside the unit is higher than the upper limit of the temperature range for that unit, the compressor is turned on, and the unit begins to cool down until the temperature inside the unit is within the set temperature range. Then the compressor stops, and this cycle is repeated to maintain the temperature inside the unit within that temperature range.

[0003] However, relying solely on the temperature within the room is insufficient to accurately control the operating parameters of the refrigeration system, resulting in high energy consumption. Summary of the Invention

[0004] This disclosure provides a refrigeration system and its control method, apparatus, equipment, and storage medium; it enables more precise control of the operating parameters of the refrigeration system, thereby reducing energy consumption.

[0005] The technical solution disclosed herein is implemented as follows:

[0006] In a first aspect, this disclosure provides a control method for a refrigeration system, the control method comprising:

[0007] The mass of the items stored in the compartment of the refrigeration equipment, the temperature inside the compartment, and the current ambient temperature of the refrigeration equipment are obtained.

[0008] The optimal operating frequency of the compressor is determined based on the mass of the item and the temperature inside the chamber.

[0009] The optimal opening degree of the electronic expansion valve is determined based on the optimal operating frequency and the ambient temperature.

[0010] Secondly, this disclosure provides a control device for a refrigeration system, the control device comprising: an acquisition unit, a first determination unit, and a second determination unit, wherein...

[0011] The acquisition unit is configured to acquire the mass of the items stored in the compartment of the refrigeration equipment, the temperature of the compartment, and the current ambient temperature of the refrigeration equipment.

[0012] The first determining unit is configured to determine the optimal operating frequency of the compressor based on the mass of the item and the temperature inside the compartment;

[0013] The second determining unit is configured to determine the optimal opening degree of the electronic expansion valve based on the optimal operating frequency and the ambient temperature.

[0014] Thirdly, this disclosure provides a computing device comprising: a processor and a memory; the processor being configured to execute instructions stored in the memory to implement the control method for the cooling system as described in the first aspect.

[0015] Fourthly, this disclosure provides a computer-readable storage medium storing at least one instruction that is executed by a processor to implement the control method of the cooling system as described in the first aspect.

[0016] Fifthly, this disclosure provides a refrigeration system, the refrigeration system comprising: a controller, a compressor, and an electronic expansion valve; wherein,

[0017] The controller is configured to determine the optimal operating frequency of the compressor and the optimal opening degree of the electronic expansion valve based on the control method of the refrigeration system described in the first aspect.

[0018] The compressor and electronic expansion valve are controlled to operate at the optimal operating frequency and optimal opening degree, respectively.

[0019] This disclosure provides a refrigeration system and its control method, apparatus, equipment, and storage medium; the optimal operating frequency of the compressor is determined based on the mass of the items stored in the refrigerator compartment and the compartment temperature, thereby enabling more precise provision of the refrigeration capacity required for the refrigeration process under optimal energy consumption conditions; subsequently, the optimal opening degree of the electronic expansion valve is determined using the optimal operating frequency and ambient temperature, so that the working states of the evaporator and condenser are also adapted to the required refrigeration capacity under optimal energy consumption conditions, enabling more precise control of the operating parameters of the refrigeration system and reducing energy consumption. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the composition of a refrigerator provided in this disclosure.

[0021] Figure 2 This is a flowchart illustrating a control method for a refrigeration system provided in this disclosure.

[0022] Figure 3 A flowchart illustrating the process for determining the optimal operating frequency of the compressor for implementation purposes provided in this disclosure.

[0023] Figure 4 This is a schematic diagram of the process for updating the operating parameters of the refrigeration system during the refrigeration process, as provided in this disclosure.

[0024] Figure 5This is a schematic diagram of the composition of a control device for a refrigeration system provided in this disclosure.

[0025] Figure 6 This is a schematic diagram of the structure of a computing device provided in this disclosure. Detailed Implementation

[0026] The technical solutions in this disclosure will now be clearly and completely described with reference to the accompanying drawings.

[0027] Figure 1 This is a schematic diagram illustrating the composition of an exemplary refrigeration device 1 disclosed herein. The refrigeration device 1 involved in this disclosure may include refrigerators, freezers, and other devices capable of storing items in a refrigerated or frozen state. Figure 1 As shown, the refrigeration device 1 includes a main body 10 with a front opening, a compartment 11 formed in the main body 10 for storing items, a door 12 for opening or closing the front opening of the main body 10, and a refrigeration system 13 for cooling the temperature inside the compartment 11.

[0028] The main body 10 defines the appearance of the refrigeration device 1. Exemplarily, the main body 10 includes an inner housing 101 for forming a compartment and an outer housing 102 coupled to the outside of the inner housing 101. An insulating material is filled between the inner housing 101 and the outer housing 102 to prevent cold air from leaking from the compartment 11.

[0029] For example, compartment 11 can be implemented as a refrigerator compartment for storing items in a refrigerated state, storing items at a temperature above zero degrees Celsius. For instance, in a refrigerated state, the temperature of compartment 11 can be maintained in a temperature range of approximately 1 to 5 degrees Celsius. Furthermore, compartment 11 can also be implemented as a freezer compartment for storing items in a frozen state, storing items at a temperature below zero degrees Celsius. For instance, in a frozen state, the temperature of compartment 11 can be maintained in a temperature range of approximately -13 to -20 degrees Celsius.

[0030] The compartment 11 can be opened or closed through the door 12. After the door 12 is closed, when the temperature inside the compartment 11, which is implemented as a refrigerator compartment, is higher than the temperature range corresponding to the refrigeration state, or when the temperature inside the compartment 11, which is implemented as a freezer compartment, is higher than the temperature range corresponding to the freezing state, the refrigeration system 13 will be activated to lower the temperature inside the compartment 11.

[0031] For example, the refrigeration system 13 includes a compressor 131, a condenser 132, an expansion valve 133, and an evaporator 134. Specifically, the compressor 131 and the condenser 132 may be arranged in the machine room at the lower rear of the main body 10. Figure 1 (Not shown). The expansion valve 133 and the evaporator 134 can be installed in the pipes (not shown) inside the main body 10. Figure 1 (Not shown)

[0032] For example, in conjunction with the components included in the above-described refrigeration system 13, the refrigeration system 13 operates in the following modes during the process of reducing the temperature inside the compartment 11 to within the temperature range corresponding to the refrigeration or freezing state (i.e., the refrigeration process):

[0033] First, compressor 131 compresses the low-pressure gaseous refrigerant to form a high-pressure gaseous refrigerant, and then transmits the high-pressure gaseous refrigerant to condenser 132 through refrigerant pipeline 15 under high pressure.

[0034] Subsequently, the high-pressure gaseous refrigerant is condensed into a high-pressure liquid refrigerant by condenser 132, and during this condensation process, the refrigerant releases latent heat. In some examples, condenser 132 is heated by the latent heat released from the refrigerant; therefore, a cooling fan can be provided. Figure 1 (Not shown in the image) to cool condenser 132.

[0035] Next, expansion valve 133 reduces the pressure of the high-pressure liquid refrigerant, and it can also regulate the amount of refrigerant so that the refrigerant can absorb sufficient heat energy from the evaporator 134. In some examples, expansion valve 133 can be implemented as an electronic expansion valve, in which case it can be controlled by a controller (…). Figure 1 Under the control of (not shown in the image) via the driver ( Figure 1 (Not shown in the image) Adjust the opening or closing state of the expansion valve 133, as well as the degree of opening (which can be simply referred to as the opening degree).

[0036] Finally, the evaporator 134 evaporates the depressurized liquid refrigerant, and during the evaporation process, the refrigerant absorbs latent heat from the evaporator 134 to cool the air surrounding the evaporator 134. In some examples, the refrigeration device 1 also includes a fan 16 that directs the air cooled by the evaporator 134 through the air outlet 17 into the compartment 11 to lower the temperature inside the compartment 11, and returns the flowing air to the vicinity of the evaporator 134 through the return air outlet 18.

[0037] After the evaporation process is complete, the low-pressure gaseous refrigerant formed by the evaporation of the depressurized liquid refrigerant returns to the compressor 131, thus repeating the above refrigeration cycle. In some examples, the pressure generated by the compressor 131 causes the refrigerant to circulate along the condenser 132, expansion valve 133, and evaporator 134.

[0038] During the refrigeration process, the operating parameters of each component of the refrigeration system 13 can be controlled by a controller (not shown in the figure). These operating parameters represent the working parameters of the components during the refrigeration process, such as the operating frequency of the compressor and the opening degree of the electronic expansion valve. Among these operating parameters, the cooling capacity is positively correlated with the operating frequency of the compressor 131, that is, the higher the operating frequency of the compressor 131, the greater the cooling capacity. Related solutions detect the temperature inside compartment 11 and use the detected temperature to control the operating frequency of the compressor 131 to lower the temperature inside compartment 11 to the temperature range corresponding to the refrigeration or freezing state. In the above-mentioned related solutions, controlling a single operating parameter of the refrigeration system based on a single factor does not consider the demand for cooling capacity from other factors. Furthermore, in addition to the operating frequency, the cooling capacity is also related to the operating parameters of the electronic expansion valve. Therefore, the related solutions cannot accurately control the operating parameters of the refrigeration system, resulting in high energy consumption.

[0039] In order to more accurately control the operating parameters of the refrigeration system, this disclosure provides a control method for the refrigeration system. Figure 2 This is a flowchart illustrating the control method. In some examples, Figure 2 The process shown can be implemented by a controller that can control the operating parameters of the refrigeration system 13 of the refrigeration device 1. The controller can be implemented as a processor or computing device and is located inside or outside the refrigeration device 1.

[0040] like Figure 2 As shown, in step S201, the mass of the items stored in the compartment of the refrigeration equipment, the temperature inside the compartment, and the ambient temperature of the refrigeration equipment are obtained.

[0041] Specifically, as mentioned above Figure 1Taking the refrigeration equipment 1 shown as an example, the compartment 11 is usually equipped with shelves or drawers for orderly placement of items. To obtain the mass of the items stored in the compartment of the refrigeration equipment, in some examples, a weighing sensor can be installed under or at the bottom of each shelf or drawer. After collecting the weight data sensed by each sensor, the controller sums the data to obtain the mass of the items stored in the compartment 11 of the refrigeration equipment. In some examples, a weighing sensor can also be installed on the supporting components of the refrigeration equipment (e.g., the legs of the refrigeration equipment). After receiving the weight data sensed by this sensor, the controller can also obtain the mass of the items stored in the compartment 11 of the refrigeration equipment by subtracting the weight of the refrigeration equipment itself. In some examples, a camera can also be installed inside the refrigeration equipment (e.g., on the top of compartment 11 or inside door 12). After the controller acquires the image of the compartment 11 captured by the camera, it identifies the type of items stored in compartment 11 (e.g., milk, apples, etc.) based on the image and estimates the volume of the items. Then, by combining the typical density corresponding to the type of item with the volume of the item, the weight of each item is obtained, and thus the mass of the items stored in compartment 11 of the refrigeration equipment is obtained.

[0042] Furthermore, continuing with the aforementioned Figure 1 Taking the refrigeration device 1 shown as an example, in some examples, a temperature sensor is installed on the inside of the door 12 or the inner wall of the compartment 11. The temperature sensor can detect the temperature inside the compartment and transmit the temperature to the controller.

[0043] In some examples, a temperature sensor is installed on the outside of the door 12. This temperature sensor can detect the current ambient temperature of the cooling device 1 and transmit this ambient temperature to the controller. In some examples, the cooling device 1 may also be equipped with a communication module. The controller communicates with a terminal or server outside the cooling device 1 through the communication module. For example, the communication module communicates with a thermometer within a home's local area network, or it communicates with a weather information server via a wireless mobile network to obtain the current ambient temperature of the cooling device 1. In this disclosure, the communication module can be implemented not only as a wired or wireless communication module, but also as a mobile communication module.

[0044] Understandably, in addition to the examples above, other means of detecting the quality of items stored in a room, the temperature inside the room, and the ambient temperature of the refrigeration equipment are also applicable to this disclosure, and will not be described in detail here.

[0045] In step S202, the optimal operating frequency of the compressor is determined based on the mass of the item and the temperature inside the room.

[0046] In this disclosure, the compressor's operating frequency is used as an exemplary operating parameter of the refrigeration system 13. Specifically, in the refrigeration process (also known as a temperature pull-down process) that lowers the temperature inside the compartment to a temperature range corresponding to the refrigeration or freezing state, the compressor's operating frequency is typically controlled based on the difference between the temperature inside the compartment and the target temperature. This provides the cooling capacity to lower the temperature inside the compartment and the temperature of the stored items within it to the target temperature, which falls within the temperature range corresponding to the refrigeration or freezing state, within a set time threshold. However, when the temperature inside the compartment and the target temperature are the same, the smaller the mass of the stored items, the less cooling capacity is required. If the compressor's operating frequency is controlled solely based on the difference between the temperature inside the compartment and the target temperature, cooling capacity will be wasted when there are fewer items stored in the compartment, leading to increased energy consumption.

[0047] Based on this, in this disclosure, the controller combines the aforementioned difference with the mass of the objects stored in the compartment to determine the total cooling capacity required for the refrigeration process, thereby providing the required cooling capacity more accurately. Subsequently, based on this total cooling capacity and the goal of optimal energy consumption, the operating frequency of the compressor during the refrigeration process is controlled to avoid energy waste.

[0048] In step S203, the optimal opening degree of the electronic expansion valve is obtained based on the optimal operating frequency and the ambient temperature.

[0049] In this disclosure, besides the compressor's operating frequency, the opening degree of the electronic expansion valve serves as another exemplary operating parameter of the refrigeration system 13. Specifically, the optimal operating frequency of the compressor corresponding to the optimal energy consumption described in step S202 represents the cooling capacity demand under optimal energy consumption conditions. To avoid excessively low evaporator pressure or insufficient refrigerant supply under such cooling capacity demand conditions, the opening degree of the electronic expansion valve is adapted to this cooling capacity demand, i.e., adapted to the compressor's optimal operating frequency. Furthermore, ambient temperature affects the condenser's heat exchange efficiency. To address this influencing factor, and to adapt the condenser's heat exchange efficiency to the cooling capacity demand under optimal energy consumption conditions, the opening degree of the electronic expansion valve is adapted to the condenser's heat exchange efficiency, i.e., adapted to the ambient temperature. Combining these two adaptation scenarios, this disclosure controls the opening degree of the electronic expansion valve by combining ambient temperature and the compressor's optimal operating frequency, enabling adaptation to the cooling capacity demand even when the compressor is operating at its optimal frequency.

[0050] against Figure 2The technical solution disclosed herein determines the optimal operating frequency of the compressor based on the mass of the stored items and the temperature of the room, thereby enabling more precise provision of the cooling capacity required for the refrigeration process under optimal energy consumption conditions. Subsequently, the optimal opening degree of the electronic expansion valve is determined using the optimal operating frequency and ambient temperature, so that the working states of the evaporator and condenser are also adapted to the cooling capacity required under optimal energy consumption conditions. This allows the technical solution disclosed herein to more accurately control the operating parameters of the refrigeration system, thereby reducing energy consumption.

[0051] In this disclosure, Figure 2 The technical solution shown controls the operating parameters of the refrigeration system during the refrigeration process, and can be implemented before, during, or after the refrigeration process begins. For example, when the refrigeration equipment is powered on for the first time, if the initial temperature in the room... Temperatures exceeding the threshold temperature required to determine whether to enter the cooling process (i.e., the pull-down process) The controller then controls the refrigeration system of the refrigeration equipment to enter the refrigeration process and implement it. Figure 2 The technical solution shown is used to control the operating parameters of the refrigeration system. Furthermore, even when the refrigeration equipment is not being powered on for the first time, if the initial temperature inside the room... Greater than And if the set duration is maintained (e.g., 3 minutes), then the controller will control the refrigeration system to enter the refrigeration process and implement it. Figure 2 The technical solution shown is used to control the operating parameters of the refrigeration system.

[0052] Figure 3 This is a flowchart illustrating the process of determining the optimal operating frequency of the compressor based on the mass of the item and the temperature inside the compartment, as described in step S202. Figure 3 As shown, the process may include:

[0053] S301: Obtain the total amount of cooling required for the cooling process based on the mass of the items and the temperature inside the room.

[0054] Specifically, to reduce the temperature inside the room from the initial temperature Reduce to target temperature Taking the refrigeration process as an example, when obtaining the total refrigeration capacity required for the refrigeration process, the items stored in the room are considered first. This disclosure is based on the quality of the items. Initial temperature in the room and target temperature The required cooling capacity under ideal conditions can be obtained by the following formula. .

[0055]

[0056] in, This indicates the specific heat capacity of items stored in a room.

[0057] Furthermore, in the actual operating environment of a refrigeration system, heat loss is inevitable; that is, the heat loss caused by the resistance that the freezer must overcome when cooling down. Therefore, the total cooling capacity required for the refrigeration process... In addition to the cooling capacity required under ideal conditions In addition, there is also heat loss in the actual operating environment.

[0058] In detail, the heat loss power under actual conditions is set as follows: The duration of the cooling process is The heat loss in the actual operating environment is The total amount of cooling required for the cooling process Then it is The above-mentioned heat loss power values ​​are calculated based on the heat penetration of the refrigeration equipment, the heat generation of various components of the refrigeration equipment, etc., and are specifically affected by the internal and external temperature difference of the refrigeration equipment, the material of the refrigeration equipment, and the heat generation power of various electronic components of the refrigeration equipment.

[0059] S302: Determine the lower limit of the compressor's operating frequency during the refrigeration process based on the total refrigeration capacity required for the refrigeration process and the upper limit of the refrigeration process duration.

[0060] Specifically, after obtaining the total cooling capacity, the maximum allowable duration of the cooling process under actual conditions is determined, i.e., the upper limit of the cooling process duration. .

[0061] The upper limit of the cooling process duration is obtained. Then, based on the total cooling capacity and the upper limit of the cooling process duration. Determine the lower limit of the compressor's cooling capacity per unit time. For example, total cooling capacity. Duration of the cooling process and the cooling capacity of the compressor per unit time The relationship between them is Based on this relationship, the compressor's cooling capacity per unit time is determined to be... .

[0062] Based on the relationship between the compressor's cooling capacity and power and its operating frequency, the lower limit of the compressor's cooling capacity per unit time is obtained. The corresponding lower limit of the compressor's operating frequency during the refrigeration process For example, the cooling capacity of a compressor per unit time. With the operating frequency of the compressor The relationship between them satisfies the following equation:

[0063]

[0064] in, and These are experimental constants related to the type of refrigerant, compressor construction, and refrigeration system operating conditions (such as evaporation or condensation temperatures). Specifically, The latent heat of vaporization, specific heat capacity of the refrigerant, and compression efficiency of the compressor are positively correlated. In other words, the higher the latent heat of vaporization, specific heat capacity of the refrigerant, and compression efficiency of the compressor, the higher the cooling capacity of the refrigeration system per unit time at the set frequency. The higher. It is related to the operating temperature of the refrigeration system (e.g., ambient temperature), and has a negative correlation. That is, the higher the operating temperature of the refrigeration system (e.g., ambient temperature), the lower the cooling capacity of the refrigeration system per unit time at the set frequency. The lower the value. Based on the above relationship, the lower limit of the compressor's operating frequency during the refrigeration process can be obtained. .

[0065] S303: Find the optimal operating frequency that minimizes energy consumption between the lower limit of the compressor's operating frequency during the refrigeration process and the upper limit of the compressor's operating frequency.

[0066] Specifically, there is an upper limit to the operating frequency of the compressor. When the compressor operates at a certain frequency At this upper limit value The lower limit of the compressor's operating frequency during the refrigeration process In between, that is It can achieve a duration not exceeding the upper limit of the refrigeration process. Provide the total amount of cooling required for the cooling process within the specified time period. .

[0067] The upper limit of the compressor's operating frequency and the lower limit of the operating frequency during the refrigeration process The frequency range formed , In this disclosure, the optimal operating frequency is searched within the frequency range with the goal of minimizing energy consumption.

[0068] For example, energy consumption With the power of the compressor and compressor running time It is related and can be expressed as a formula: In the energy consumption expression, the compressor power... With the operating frequency of the compressor Relevant, and expressed as ,in, and These are experimental constants related to the type of refrigerant, compressor construction, and refrigeration system operating conditions (such as evaporation or condensation temperatures). Specifically, The latent heat of vaporization, specific heat capacity of the refrigerant, and compression efficiency of the compressor are negatively correlated. In other words, the higher the latent heat of vaporization, specific heat capacity of the refrigerant, and compression efficiency of the compressor, the lower the compressor power. The lower. It is positively correlated with ambient temperature; that is, the higher the ambient temperature, the higher the compressor power. The larger the value, the greater the compressor runtime in the energy consumption expression. The duration is the same as the refrigeration process, and is expressed as... .

[0069] In the frequency range [ , In the above energy consumption formula, a search is performed with a step size of 1 Hz, and the energy consumption corresponding to each candidate operating frequency is calculated according to the above energy consumption formula. Then, the candidate operating frequency corresponding to the lowest energy consumption is determined as the optimal operating frequency.

[0070] In accordance with the above Figure 3 The technical solution shown determines the optimal operating frequency of the compressor. Subsequently, in order to adapt the opening degree of the electronic expansion valve to the optimal operating frequency and ambient temperature, this disclosure obtains the optimal opening degree of the electronic expansion valve according to the following formula. :

[0071]

[0072] in, This represents the frequency coefficient of the electronic expansion valve. This represents the experimental constant of the electronic expansion valve. and Calculated from experimental tests of refrigeration equipment. This indicates the current ambient temperature of the refrigeration equipment.

[0073] Regarding the calculation expression for the optimal opening degree mentioned above, it should be noted that the higher the compressor's operating frequency, the more times the refrigerant circulates in the refrigeration system per unit time, and the more refrigerant the system requires. In this case, the electronic expansion valve needs to be set to a higher opening degree. Conversely, the lower the compressor's operating frequency, the lower the electronic expansion valve needs to be set to an lower opening degree. However, there is a linear relationship between the compressor's operating frequency and the optimal opening degree of the electronic expansion valve. Therefore, this disclosure uses the above-mentioned linear function to describe this linear relationship, with the above coefficients... and It can represent the detailed functional relationship of this linear relationship.

[0074] Furthermore, during the experimental testing, when the ambient temperature and initial frequency were set, and the initial temperature and the weight of the stored items were also set to be the same within the same room, the optimal opening degree could be determined by comparing the time required to reach a certain temperature under different opening degrees. Based on the rule that a straight line can be drawn from two points, the optimal opening degree at a given operating frequency could then be determined. Subsequently, by changing the initial frequency and following the same testing method, a second operating frequency and its corresponding optimal opening degree could be obtained. Substituting these two points into the aforementioned calculation expression for the optimal opening degree yielded the coefficient. and Value. In some examples, this can also be achieved by dividing the temperature range into different zones and testing separately for each zone to obtain a more accurate coefficient. and This value is used to improve the accuracy of setting the overall system parameters.

[0075] It should be noted that the optimal operating frequency of the compressor is obtained through the above technical solutions. And the optimal opening degree of the electronic expansion valve After that, the controller can follow and The compressor's operating frequency and the electronic expansion valve's opening are controlled separately during the refrigeration process until the temperature inside the compartment drops to or below the target temperature. When the temperature inside the compartment is less than or equal to the target temperature, it indicates that compartment 11 of the refrigeration equipment is in either refrigeration or freezing mode, and the compressor can be stopped at this point. Thus, the technical solution disclosed herein can more accurately provide the required refrigeration capacity during the refrigeration process and reduce energy waste.

[0076] The above-mentioned embodiments obtained and These are the optimal operating parameters for the refrigeration equipment 1 when the door 12 is not opened during the refrigeration process. However, the refrigeration process of the refrigeration equipment 1 typically lasts for hours. For example, in an unloaded state (without stored items in compartment 11), it takes 2-4 hours to lower the temperature inside compartment 11 from room temperature to the target temperature for refrigeration (e.g., 4 degrees Celsius) or freezing (e.g., -18 degrees Celsius). In a loaded state (with many hot items such as hot food in compartment 11), the refrigeration process may extend to 4-6 hours. During such a long refrigeration process, there will be situations where the door 12 is opened to take items out of compartment 11, or where items are placed inside compartment 11 for storage. When these situations occur, the cooled air inside compartment 11 will leak out of the refrigeration equipment 1, and hot air from the environment surrounding the refrigeration equipment 1 will enter compartment 11, causing the temperature inside compartment 11 to rise, thus requiring more refrigeration capacity to complete the refrigeration process. In addition, the handling of items can cause changes in the quality of items in the room, which can also affect the cooling capacity required for the cooling process.

[0077] In response to the impact caused by opening the door 12 to take or put away items, this disclosure will also update the operating parameters of the refrigeration system 13 during the refrigeration process. Figure 4 This is a schematic diagram illustrating the process of updating the operating parameters of the refrigeration system 13 during the refrigeration process, as provided in this disclosure. Figure 4 As shown, the process may include:

[0078] S401: During the cooling process, the required cooling capacity under ideal conditions at the monitoring time is obtained based on the temperature inside the room at the monitoring time and the mass of the items inside the room at the monitoring time.

[0079] Specifically, during the refrigeration process, by setting monitoring times to acquire the temperature and the mass of items within compartment 11, the system can indicate whether door 12 has been opened during the refrigeration process. In some examples, a contact sensor can be installed on door 12 in the refrigeration unit 1 to detect whether door 12 has been opened and then closed during the refrigeration process. When this signal appears, it indicates that door 12 has undergone an opening and closing operation, and the time when this signal appears is determined as the monitoring time. In some examples, the monitoring time can also be determined according to a set cycle. For example, during the refrigeration process, a monitoring time can be set every 30 minutes, and the temperature and the mass of items within compartment 11 can be acquired at this monitoring time.

[0080] The technical means for acquiring the temperature and the quality of items within the room at monitoring times are the same as those mentioned above. Figure 2The specific implementation method of step S201 in the technical solution shown is the same, and will not be repeated here. Furthermore, the calculation method for the required cooling capacity under ideal conditions corresponding to the monitoring time is also the same as described above. Figure 2 The technical solution shown The calculation methods are similar.

[0081] For example, the duration from the start of the cooling process to the monitoring time is set as follows: At this time, the temperature inside the room is The weight of the items in the room is The required cooling capacity under ideal conditions at the time of this monitoring .

[0082] S402: Determine the first remaining duration based on the required cooling capacity under ideal conditions corresponding to the monitoring time and the compressor's operating frequency at the monitoring time.

[0083] Specifically, the required cooling capacity under ideal conditions at this monitoring time This indicates that during the cooling process, starting from the monitoring time, the temperature of the items in the room will be reduced to the target temperature. The required cooling capacity also needs to be provided. This disclosure is based on the compressor's operating frequency at the monitoring time. and the cooling capacity It can calculate the operating frequency based on the current monitoring time. The time required, that is, from the moment of monitoring, to reduce the item's temperature to the target temperature without updating the compressor's operating frequency. The required duration is defined in this disclosure as the first remaining duration. In detail, the first remaining time The following formula is used to calculate:

[0084]

[0085] in, This indicates that the compressor's operating frequency is The cooling capacity per unit time.

[0086] S403: When the sum of the duration from the start of the cooling process to the monitoring time and the first remaining duration is greater than the upper limit of the cooling process duration, obtain the second remaining duration.

[0087] As described in the aforementioned technical solution, the refrigeration process has a corresponding upper limit on its duration. In this disclosure, the duration from the start of the refrigeration process to the monitoring time is... The remaining time is less than or equal to the upper limit of that time. This indicates that no updates to the refrigeration system's operating parameters are needed. The duration from the start of the refrigeration process to the monitoring time... With the first remaining time Greater than the maximum duration This indicates that the compressor operates at the frequency specified at the monitoring time. The program cannot run within the maximum duration limit. The refrigeration process is completed internally, therefore, the compressor's operating frequency needs to be updated, which in turn requires updating the opening degree of the electronic expansion valve, thereby achieving the upper limit of the time. The cooling process is completed within the time frame. If starting from the monitoring time, it is expected to reach the upper limit of the duration. If the cooling process is completed within a certain timeframe, then the remaining time for the cooling process is the second remaining time. ,and .

[0088] S404: Determine the optimal operating frequency of the compressor and the optimal opening degree of the electronic expansion valve during the second remaining time.

[0089] Specifically, in order to be able to reach the maximum duration limit The refrigeration process is completed within a certain time period. This disclosure updates the operating parameters of the refrigeration system during the second remaining time period. Taking the compressor operating frequency and electronic expansion valve opening degree described in the aforementioned technical solution as examples, according to the aforementioned... Figure 3 The calculation expressions for the optimal operating frequency and optimal opening degree in the scheme shown are used to obtain the optimal operating frequency of the compressor in the second remaining time period. And the optimal opening degree of the electronic expansion valve during the second remaining time. Specifically, the optimal operating frequency of the compressor during the second remaining time period. pass The optimal opening degree of the electronic expansion valve during the second remaining time period was calculated. pass Calculated.

[0090] Based on the aforementioned technical solution, this disclosure conducts comparative experiments on the compressor's operating frequency, the operating parameters of other components in the refrigeration system, and related temperature values ​​under different stored item weights, using the power consumption during the temperature-raising process as the evaluation parameter for the experimental results. In this comparative experiment, the stored items were beverages. The experimental results are shown in Table 1.

[0091] Table 1: Experimental Results

[0092]

[0093] Table 1 shows that, firstly, when the cooling process duration is less than the upper limit, operating the compressor at its maximum frequency during the cooling process is not the most energy-efficient option. Secondly, the most energy-efficient operating frequency of the compressor varies depending on the weight of the items, even when the cooling process duration is less than the upper limit. The results in Table 1 indicate that to achieve the lowest energy consumption, both the compressor's operating frequency during the cooling process and the weight of the items stored in the compartment need to be considered.

[0094] Based on the same inventive concept as the aforementioned technical solutions, this disclosure also provides a control device 50 for a refrigeration system. Figure 5 This is a schematic diagram of the control device 50 of the refrigeration system. (See attached diagram.) Figure 5 The control device 50 of the refrigeration system includes:

[0095] The acquisition unit 501 is configured to acquire the mass of the items stored in the compartment of the refrigeration equipment, the temperature inside the compartment, and the current ambient temperature of the refrigeration equipment.

[0096] The first determining unit 502 is configured to determine the optimal operating frequency of the compressor based on the mass of the item and the temperature inside the compartment;

[0097] The second determining unit 503 is configured to determine the optimal opening degree of the electronic expansion valve based on the optimal operating frequency and the ambient temperature.

[0098] In some examples, the first determining unit 502 is configured to:

[0099] The total amount of cooling required for the cooling process is determined based on the weight of the items and the temperature inside the room.

[0100] The lower limit of the compressor's operating frequency during the refrigeration process is determined based on the total cooling capacity required for the refrigeration process and the upper limit of the refrigeration process duration.

[0101] The optimal operating frequency that minimizes energy consumption is obtained between the lower limit of the compressor's operating frequency during the refrigeration process and the upper limit of the compressor's operating frequency.

[0102] In some examples, the first determining unit 502 is configured to:

[0103] The required cooling capacity under ideal conditions is determined based on the mass of the items, the initial temperature inside the room, and the target temperature of the cooling process.

[0104] Based on the required cooling capacity under ideal conditions and heat loss, the total cooling capacity required for the cooling process is obtained.

[0105] In some examples, the first determining unit 502 is configured to:

[0106] The lower limit of the compressor's cooling capacity power is determined based on the total cooling capacity and the upper limit of the cooling process duration.

[0107] Based on the relationship between the compressor's cooling capacity and power and its operating frequency, the lower limit of the compressor's operating frequency during the cooling process is obtained, corresponding to the lower limit of the compressor's cooling capacity and power.

[0108] In some examples, the first determining unit 502 is configured to:

[0109] Within the frequency range defined by the upper limit of the compressor's operating frequency and the lower limit of the compressor's operating frequency during the refrigeration process, candidate operating frequencies are searched out according to a set step size.

[0110] Obtain the energy consumption corresponding to each candidate operating frequency;

[0111] The candidate operating frequency corresponding to the lowest energy consumption is determined as the optimal operating frequency.

[0112] In some examples, the acquisition unit 501 is also configured to acquire the required cooling capacity under ideal conditions at the monitoring time based on the temperature inside the room at the monitoring time and the mass of the items inside the room at the monitoring time during the cooling process.

[0113] The first determining unit 502 is also configured as follows:

[0114] The first remaining duration is determined based on the cooling capacity required under ideal conditions at the monitoring time and the compressor's operating frequency at the monitoring time.

[0115] When the sum of the duration from the start of the cooling process to the monitoring time and the first remaining duration is greater than the upper limit of the cooling process duration, the second remaining duration is obtained.

[0116] Determine the optimal operating frequency of the compressor during the second remaining time period;

[0117] The second determining unit 503 is also configured to determine the optimal opening degree of the electronic expansion valve during the second remaining time period.

[0118] Please refer to Figure 6 This diagram illustrates a structural block diagram of a computing device 60 provided in an exemplary embodiment of this disclosure. The computing device can be implemented as a controller in the foregoing technical solutions. In some examples, the computing device 60 can receive data based on an accessed wired or wireless network. It is understood that the computing device 60 undertakes the computation and processing work of the technical solutions of this disclosure, and this disclosure does not limit its scope.

[0119] like Figure 6 As shown, the computing device 60 in this disclosure may include one or more components such as a processor 610 and a memory 620.

[0120] Optionally, the processor 610 connects various parts within the computing device using various interfaces and lines, and performs various functions and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 620, and by calling data stored in the memory 620. Optionally, the processor 610 can be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 610 can integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), Neural-network Processing Unit (NPU), and baseband chip. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the content required to be displayed on the touch screen; the NPU is used to implement Artificial Intelligence (AI) functions; and the baseband chip is used to handle wireless communication. It is understandable that the aforementioned baseband chip may not be integrated into the processor 610, but may be implemented using a separate chip.

[0121] The memory 620 may include random access memory (RAM) or read-only memory (ROM). Optionally, the memory 620 may include a non-transitory computer-readable storage medium. The memory 620 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 620 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as touch function, sound playback function, image playback function, etc.), instructions for implementing the various method embodiments described above, etc.; the data storage area may store data created according to the use of the computing device, etc.

[0122] In addition, those skilled in the art will understand that the structure of the computing device shown in the above figures does not constitute a limitation on the computing device. The computing device may include more or fewer components than shown, or combine certain components, or have different component arrangements. For example, the computing device may also include a display screen, camera assembly, microphone, speaker, radio frequency circuit, input unit, sensors (such as accelerometer, angular velocity sensor, light sensor, etc.), audio circuit, WiFi module, power supply, Bluetooth module, etc., which will not be described in detail here.

[0123] This disclosure also provides a computer-readable storage medium storing at least one instruction that is executed by a processor to implement the control method of the refrigeration system as described in the above embodiments.

[0124] This disclosure also provides a computer program product including computer instructions stored in a computer-readable storage medium; a processor of a computing device reads the computer instructions from the computer-readable storage medium and executes the computer instructions, causing the computing device to perform the control method of the cooling system described in the above embodiments.

[0125] Those skilled in the art will recognize that the functions described in this disclosure in one or more of the examples above can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0126] It should be noted that the technical solutions described in this disclosure can be combined arbitrarily as long as they do not conflict.

[0127] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A control method for a refrigeration system, characterized in that, The control method includes: The mass of the items stored in the compartment of the refrigeration equipment, the temperature inside the compartment, and the current ambient temperature of the refrigeration equipment are obtained. The optimal operating frequency of the compressor is determined based on the mass of the item and the temperature inside the chamber. Based on the optimal operating frequency and the ambient temperature, according to Determine the optimal opening degree of the electronic expansion valve; This represents the frequency coefficient of the electronic expansion valve. This represents the experimental constant of the electronic expansion valve. and Calculated from experimental tests of refrigeration equipment. This indicates the current ambient temperature of the refrigeration equipment; The step of determining the optimal operating frequency of the compressor based on the mass of the item and the temperature inside the compartment includes: The total amount of cooling required for the cooling process is obtained based on the mass of the item and the temperature inside the room. The lower limit of the compressor's operating frequency during the refrigeration process is determined based on the total cooling capacity required for the refrigeration process and the upper limit of the refrigeration process duration. The optimal operating frequency that minimizes energy consumption is obtained between the lower limit of the compressor's operating frequency during the refrigeration process and the upper limit of the compressor's operating frequency.

2. The control method according to claim 1, characterized in that, The step of obtaining the total cooling capacity required for the cooling process based on the mass of the item and the temperature inside the room includes: The required cooling capacity under ideal conditions is obtained based on the mass of the item, the initial temperature inside the room, and the target temperature of the cooling process. Based on the required cooling capacity and heat loss under the ideal conditions, the total cooling capacity required for the cooling process is obtained.

3. The control method according to claim 1, characterized in that, The step of determining the lower limit of the compressor's operating frequency during the refrigeration process based on the total refrigeration capacity required and the upper limit of the refrigeration process duration includes: The lower limit of the compressor's cooling capacity power is determined based on the total cooling capacity and the upper limit of the cooling process duration. Based on the relationship between the compressor's cooling capacity and power and its operating frequency, the lower limit of the compressor's operating frequency during the cooling process is obtained, corresponding to the lower limit of the compressor's cooling capacity and power.

4. The control method according to claim 1, characterized in that, Finding the optimal operating frequency that minimizes energy consumption between the lower limit of the compressor's operating frequency during the refrigeration process and the upper limit of the compressor's operating frequency includes: Within the frequency range defined by the upper limit of the compressor's operating frequency and the lower limit of the compressor's operating frequency during the refrigeration process, candidate operating frequencies are searched out according to a set step size. Obtain the energy consumption corresponding to each candidate operating frequency; The candidate operating frequency corresponding to the lowest energy consumption is determined as the optimal operating frequency.

5. The control method according to claim 1, characterized in that, The method further includes: During the refrigeration process, the required refrigeration capacity under ideal conditions corresponding to the monitoring time is obtained based on the temperature of the room at the monitoring time and the mass of the items in the room at the monitoring time. The first remaining duration is determined based on the cooling capacity required under ideal conditions corresponding to the monitoring time and the operating frequency of the compressor at the monitoring time; When the sum of the duration from the start of the cooling process to the monitoring time and the first remaining duration is greater than the upper limit of the cooling process duration, the second remaining duration is obtained; Determine the optimal operating frequency of the compressor and the optimal opening degree of the electronic expansion valve during the second remaining time period.

6. A control device for a refrigeration system, characterized in that, The control device includes: an acquisition unit, a first determination unit, and a second determination unit, wherein... The acquisition unit is configured to acquire the mass of the items stored in the compartment of the refrigeration equipment, the temperature of the compartment, and the current ambient temperature of the refrigeration equipment. The first determining unit is configured to determine the optimal operating frequency of the compressor based on the mass of the item and the temperature inside the compartment; The second determining unit is configured to determine the optimal operating frequency and the ambient temperature according to... Determine the optimal opening degree of the electronic expansion valve; This represents the frequency coefficient of the electronic expansion valve. This represents the experimental constant of the electronic expansion valve. and Calculated from experimental tests of refrigeration equipment. This indicates the current ambient temperature of the refrigeration equipment; The first determining unit is configured to: The total amount of cooling required for the cooling process is obtained based on the mass of the item and the temperature inside the room. The lower limit of the compressor's operating frequency during the refrigeration process is determined based on the total cooling capacity required for the refrigeration process and the upper limit of the refrigeration process duration. The optimal operating frequency that minimizes energy consumption is obtained between the lower limit of the compressor's operating frequency during the refrigeration process and the upper limit of the compressor's operating frequency.

7. A computing device, characterized in that, The computing device includes a processor and a memory; the processor is used to execute instructions stored in the memory to implement the control method of the refrigeration system as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, which is executed by a processor to implement the control method of the refrigeration system as described in any one of claims 1 to 5.

9. A refrigeration system, characterized in that, The refrigeration system includes: a controller, a compressor, and an electronic expansion valve; wherein, The controller is configured to determine the optimal operating frequency of the compressor and the optimal opening degree of the electronic expansion valve based on the control method of the refrigeration system according to any one of claims 1 to 5. The compressor and electronic expansion valve are controlled to operate at the optimal operating frequency and optimal opening degree, respectively.

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