Control method and device for water chilling unit and water chilling unit
By calculating the exhaust gas superheat difference value to adjust the electronic expansion valve opening of the chiller unit, the problem of inaccurate control of the electronic expansion valve opening in the prior art is solved, and the efficient operation of the chiller unit is achieved.
Patent Information
- Application Number
- CN202311851421.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-28
- Publication Date
- 2025-07-01
AI Technical Summary
In existing chiller units, the opening control of the electronic expansion valve is difficult to accurately control, resulting in the low operating efficiency of the chiller unit and the inability to adapt to the dynamic changes of the refrigeration system.
By continuously obtaining multiple exhaust gas superheats, the target adjustment value is calculated using the difference between the target exhaust gas superheat and the multiple exhaust gas superheats, and the opening degree of the electronic expansion valve is accurately adjusted.
It realizes precise control of the opening of the electronic expansion valve, improves the operating efficiency and stability of the chiller unit, avoids excessive adjustment, and ensures efficient operation of the chiller unit under dynamic changing conditions.
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Figure CN120232192A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of chillers, for example, to a control method, a device and a chiller for a chiller. Background Art
[0002] Currently, the opening degree of the electronic expansion valve of a chiller (such as a centrifugal chiller) is usually adjusted according to the detection signal of a liquid level gauge arranged on the chiller. Specifically, in the related art, the liquid level gauge detects the real-time refrigerant liquid level of the evaporator or the condenser, and sends the refrigerant liquid level information to the controller, and the controller controls the opening degree of the electronic expansion valve.
[0003] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art: Since the operating state of the refrigeration system of the chiller is dynamically changing, for example, changes in the cooling load, changes in the ambient temperature, etc. may all affect the flow and distribution of the refrigerant. Such dynamic changes easily make the detection result of the liquid level gauge lag behind the change of the actual refrigerant liquid level, resulting in difficulty in accurately controlling the opening degree of the electronic expansion valve, and ultimately resulting in the inconsistency between the actual opening degree of the electronic expansion valve and the target value, and the chiller cannot reach the most efficient operating state.
[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention
[0005] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.
[0006] The embodiments of the present disclosure provide a control method, a device and a chiller for a chiller to more accurately control the opening degree of the electronic expansion valve, so that the chiller reaches a more efficient operating state.
[0007] In some embodiments, the control method for a chiller includes: continuously obtaining a plurality of discharge superheats of the chiller and a target discharge superheat at preset time intervals; wherein the number of the plurality of discharge superheats is greater than or equal to 3; determining a target adjustment value according to the plurality of discharge superheats and the target discharge superheat; adjusting the opening degree of the electronic expansion valve of the chiller according to the target adjustment value.
[0008] Optionally, the plurality of discharge superheats sequentially include a first discharge superheat, a second discharge superheat and a third discharge superheat in chronological order.
[0009] Optionally, determining a target adjustment value according to a plurality of exhaust superheat degrees and a target exhaust superheat degree includes: respectively calculating differences between a first exhaust superheat degree, a second exhaust superheat degree, and a third exhaust superheat degree and the target exhaust superheat degree to obtain corresponding first exhaust superheat degree differences, second exhaust superheat degree differences, and third exhaust superheat degree differences; and determining the target adjustment value according to the first exhaust superheat degree differences, the second exhaust superheat degree differences, and the third exhaust superheat degree differences.
[0010] Optionally, determining the target adjustment value according to the first exhaust superheat degree differences, the second exhaust superheat degree differences, and the third exhaust superheat degree differences includes: when the third exhaust superheat degree difference is greater than a preset difference, calculating △U(K)=Kp×(E(t)-E(t - 1))+Ki×E(t)+Kd×(E(t)-2E(t - 1)+E(t - 2)) to obtain the target adjustment value; where △U(K) is the target adjustment value, E(t) is the third exhaust superheat degree difference, E(t - 1) is the second exhaust superheat degree difference, E(t - 2) is the first exhaust superheat degree difference, Kp is a first adjustment coefficient, Ki is a second adjustment coefficient, and Kd is a third adjustment coefficient; and / or when the third exhaust superheat degree difference is less than or equal to the preset difference, determining a first preset adjustment value as the target adjustment value.
[0011] Optionally, adjusting an opening degree of an electronic expansion valve of a water chiller according to the target adjustment value includes: when an absolute value of the target adjustment value is less than or equal to a second preset adjustment value, adjusting a current opening degree of the electronic expansion valve according to the target adjustment value; and / or when the absolute value of the target adjustment value is greater than the second preset adjustment value, adjusting the current opening degree of the electronic expansion valve according to the second preset adjustment value.
[0012] Optionally, obtaining the second preset adjustment value in the following manner: determining the second preset adjustment value according to a current opening degree of the electronic expansion valve.
[0013] Optionally, adjusting the current opening degree of the electronic expansion valve according to the target adjustment value includes: based on the current opening degree of the electronic expansion valve, controlling the current opening degree of the electronic expansion valve to adjust the target adjustment value at a preset adjustment rate.
[0014] Optionally, obtaining a plurality of exhaust superheat degrees of the water chiller in the following manner: continuously detecting a plurality of exhaust temperatures of a compressor of the water chiller at preset time intervals; respectively calculating △T = Td - Tc to obtain the plurality of exhaust superheat degrees of the water chiller; where △T is the plurality of exhaust superheat degrees, Td is the plurality of exhaust temperatures, and Tc is the saturation temperature.
[0015] In some embodiments, the control device for a chiller includes: an acquisition module configured to continuously obtain multiple superheat degrees of exhaust of the chiller at preset time intervals; wherein, the number of the multiple superheat degrees of exhaust is greater than or equal to 3; a determination module configured to determine a target adjustment value according to the multiple superheat degrees of exhaust and a target superheat degree; and an adjustment module configured to adjust the opening degree of an electronic expansion valve of the chiller according to the target adjustment value.
[0016] In some embodiments, the control device for a chiller includes a processor and a memory storing program instructions, and the processor is configured to execute the control method for a chiller as described above when running the program instructions.
[0017] In some embodiments, a chiller includes: a chiller body; and the control device for a chiller as described above, which is installed on the chiller body.
[0018] The control method for a chiller, the control device for a chiller, and the chiller provided by the embodiments of the present disclosure can achieve the following technical effects:
[0019] The change situation of the superheat degree can be analyzed through multiple superheat degrees of exhaust, and the exhaust temperature situation of the chiller can be determined in a timely manner, so that the opening degree of the electronic expansion valve adjusted according to the multiple superheat degrees of exhaust and the target superheat degree can be more accurate, thereby making the actual opening degree of the electronic expansion valve closer to the target opening degree, and further enabling the chiller to reach a more efficient operating state.
[0020] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. Description of the Drawings
[0021] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a proportional limitation, and among them:
[0022] Figure 1 is a schematic structural diagram of a chiller provided by an embodiment of the present disclosure;
[0023] Figure 2 is a schematic diagram of a control method for a chiller provided by an embodiment of the present disclosure;
[0024] Figure 3 is a schematic diagram of another control method for a chiller provided by an embodiment of the present disclosure;
[0025] Figure 4 is a schematic diagram of a control device for a chiller provided by an embodiment of the present disclosure;
[0026] Figure 5 is a schematic diagram of another control device for a chiller provided by an embodiment of the present disclosure;
[0027] Figure 6 is a structural block diagram of a chiller provided by an embodiment of the present disclosure. Detailed implementation manners
[0028] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are only for reference and illustration purposes and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, numerous details are provided to give a thorough understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other instances, well-known structures and devices may be shown in a simplified manner to simplify the drawings.
[0029] In the description of the embodiments of the present disclosure, the terms "first", "second", etc. in the specification, claims and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that such data may be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.
[0030] Unless otherwise specified, the term "plurality" means two or more.
[0031] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.
[0032] The term "and / or" is a description of the associated relationship of an object, indicating that there can be three relationships. For example, A and / or B means: A or B, or, A and B these three relationships.
[0033] The term "corresponding" may refer to an associated relationship or a binding relationship. A corresponding to B means that there is an associated relationship or a binding relationship between A and B.
[0034] It should be noted that, without conflict, the embodiments in the embodiments of the present disclosure and the features in the embodiments may be combined with each other.
[0035] A control method for a chiller provided by an embodiment of the present disclosure. This control method can be applied to the chiller 1. Figure 1 shows an architecture of the chiller 1. As Figure 1As shown, the chiller 1 includes: a compressor 10, an electronic expansion valve 20, and an electronic control device 30. The electronic control device 30 includes a processor. The processor is used to obtain the operating parameters of the compressor 10, adjust the electronic expansion valve 20 and other electronic control components, so as to realize various functions of the chiller 1.
[0036] Optionally, the chiller 1 further includes a temperature sensor, which is arranged at the exhaust port of the compressor 10 and is used to detect the exhaust temperature of the chiller 1.
[0037] Exemplarily, the chiller 1 includes a centrifugal chiller.
[0038] In the embodiments of the present disclosure, through the determined target adjustment value, the opening degree of the adjusted electronic expansion valve can be made more accurate, so that the chiller reaches a more efficient operating state.
[0039] Combined with Figure 1 the chiller shown, the embodiments of the present disclosure provide a control method for a chiller. The execution subject of this control method can be the processor of the electronic control device, such as Figure 2 shown, this control method includes:
[0040] S201, the processor continuously obtains multiple exhaust superheats of the chiller and the target exhaust superheat at preset time intervals.
[0041] Among them, the exhaust superheat refers to the difference between the exhaust temperature and the saturation temperature at the same pressure. The number of multiple exhaust superheats is greater than or equal to 3.
[0042] Exemplarily, the number of multiple exhaust superheats is equal to 3.
[0043] Exemplarily, multiple exhaust superheats of the chiller are obtained in the following manner: the temperature sensor continuously detects multiple exhaust temperatures of the compressor of the chiller at preset time intervals and transmits the multiple exhaust temperatures to the processor. The processor calculates ΔT = Td - Tc respectively to obtain multiple exhaust superheats of the chiller. Among them, ΔT is multiple exhaust superheats, Td is multiple exhaust temperatures, and Tc is the saturation temperature.
[0044] Exemplarily, the value range of the preset time interval is [2s (seconds), 6s]. Specifically, the preset time interval is set to 3s. In this way, multiple exhaust superheats of the chiller can be obtained in time.
[0045] Exemplarily, the target exhaust superheat can be set according to actual needs. For example, the target exhaust superheat can be set to 8K (Kelvin).
[0046] Exemplarily, the target exhaust superheat is obtained in the following manner:
[0047] M = (F × K + B) × ΔK × Kout
[0048] Wherein, M is the target superheat of exhaust gas, F is the compressor frequency, K is the superheat slope coefficient of exhaust gas, B is the superheat intercept coefficient of exhaust gas, ΔK is the correction coefficient of the indoor ambient temperature and the set temperature difference, and Kout is the correction coefficient of the outdoor ambient temperature. In this way, the target superheat of exhaust gas can be made more accurate, and thus the target adjustment value can be made more precise.
[0049] S202. The processor determines a target adjustment value according to multiple superheats of exhaust gas and the target superheat of exhaust gas.
[0050] S203. The processor adjusts the opening degree of the electronic expansion valve of the chiller according to the target adjustment value.
[0051] Wherein, in the embodiments of the present disclosure, the representation form of the opening degree of the electronic expansion valve includes, but is not limited to, the representation form of percentage. For example, the opening degree of the electronic expansion valve is 50%, 60% or 80%.
[0052] In the embodiments of the present disclosure, the change situation of the superheat can be analyzed through multiple superheats of exhaust gas, and the exhaust gas temperature situation of the chiller can be determined in time, so that the opening degree of the electronic expansion valve adjusted according to multiple superheats of exhaust gas and the target superheat of exhaust gas can be more precise, that is, the opening degree of the electronic expansion valve can be adjusted more precisely, so that the actual opening degree of the electronic expansion valve is closer to the target opening degree, and further the chiller can reach a more efficient operating state.
[0053] Optionally, the multiple superheats of exhaust gas sequentially include a first superheat of exhaust gas, a second superheat of exhaust gas and a third superheat of exhaust gas in chronological order. For example, the superheat of exhaust gas obtained at the current moment is the third superheat of exhaust gas; the superheat of exhaust gas obtained at a preset time length from the current moment is the second superheat of exhaust gas, wherein the moment at a preset time length from the current moment can be marked as the second moment; the superheat of exhaust gas obtained at a preset time length from the second moment is the first superheat of exhaust gas. If the superheat of exhaust gas obtained each time is recorded, then the superheat of exhaust gas recorded this time is the third superheat of exhaust gas, the superheat of exhaust gas recorded last time is the second superheat of exhaust gas, and the superheat of exhaust gas recorded the time before last time is the first superheat of exhaust gas.
[0054] Optionally, the processor determines the target adjustment value according to multiple superheats of exhaust gas and the target superheat of exhaust gas, including: the processor calculates the differences between the first superheat of exhaust gas, the second superheat of exhaust gas and the third superheat of exhaust gas and the target superheat of exhaust gas respectively, and obtains corresponding first superheat difference of exhaust gas, second superheat difference of exhaust gas and third superheat difference of exhaust gas. The processor determines the target adjustment value according to the first superheat difference of exhaust gas, the second superheat difference of exhaust gas and the third superheat difference of exhaust gas.
[0055] Specifically, the first exhaust superheat difference = the first exhaust superheat - the target exhaust superheat.
[0056] Specifically, the second exhaust superheat difference = the second exhaust superheat - the target exhaust superheat.
[0057] Specifically, the third exhaust superheat difference = the third exhaust superheat - the target exhaust superheat.
[0058] For example, if the target exhaust superheat is 10°C, the first exhaust superheat is 15°C, the second exhaust superheat is 8°C, and the third exhaust superheat is 12°C, then: the first exhaust superheat difference: 15°C - 10°C = 5°C; the second exhaust superheat difference: 8°C - 10°C = -2°C; the third exhaust superheat difference: 12°C - 10°C = 2°C.
[0059] In this disclosed embodiment, according to the magnitudes and signs of the first exhaust superheat difference, the second exhaust superheat difference, and the third exhaust superheat difference, it is possible to determine whether the operating state of the current water chiller is close to the target state, and accordingly determine the adjustment direction and amplitude. For example, if all the differences are positive, it indicates that the actual exhaust superheats are all higher than the target exhaust superheat; if all the differences are negative, it indicates that the actual exhaust superheats are all lower than the target exhaust superheat. In this way, the determined target adjustment value can be made more accurate, so that the actual exhaust superheat gradually approaches the target exhaust superheat, and the corresponding exhaust superheat difference will also decrease.
[0060] In addition, by determining multiple exhaust superheat differences, the change situation of the exhaust superheat can be analyzed (for example, in the above example, the change situation of the exhaust superheat is: first decreasing and then increasing). According to the change situation of the exhaust superheat, it can be determined whether the exhaust superheat is increasing or decreasing, so as to further accurately determine the target adjustment value to be adjusted.
[0061] Optionally, the processor determines the target adjustment value according to the first exhaust superheat difference, the second exhaust superheat difference, and the third exhaust superheat difference, including: when the third exhaust superheat difference is greater than the preset difference, the processor calculates △U(K) = Kp×(E(t) - E(t - 1)) + Ki×E(t) + Kd×(E(t) - 2E(t - 1) + E(t - 2)) to obtain the target adjustment value. And / or, when the third exhaust superheat difference is less than or equal to the preset difference, the processor determines the first preset adjustment value as the target adjustment value.
[0062] Wherein, △U(K) is the target adjustment value, E(t) is the third exhaust superheat difference, E(t - 1) is the second exhaust superheat difference, E(t - 2) is the first exhaust superheat difference, Kp is the first adjustment coefficient, Ki is the second adjustment coefficient, and Kd is the third adjustment coefficient.
[0063] Exemplarily, Ki > Kd, Kd > Kp.
[0064] Exemplarily, the value range of Kp is [0, 1]. The value range of Ki is [50, 150]. The value range of Kd is [20, 70]. Specifically, Kp is set to 0.05. Ki is set to 100. Kd is set to 50.
[0065] It can be understood that the target adjustment value △U(K) increases or decreases in proportion to the difference between E(t) and E(t - 1) by the first adjustment coefficient Kp, enabling the electronic expansion valve to be adjusted quickly, so as to quickly approach the target superheat degree of exhaust gas; during this adjustment process, after the system stabilizes, there will always be a deviation between the actual superheat degree of exhaust gas and the target superheat degree of exhaust gas; therefore, the value of E(t) is corrected by the second adjustment coefficient Ki to reduce the deviation between the actual superheat degree of exhaust gas value and the target superheat degree of exhaust gas. During this adjustment process, over-adjustment may occur; therefore, a third adjustment coefficient Kd is further introduced to correct the difference of three samplings, reduce over-adjustment, and make the actual superheat degree of exhaust gas gradually approach the target superheat degree of exhaust gas.
[0066] Exemplarily, the value range of the preset difference is [0.4, 0.6]. Specifically, the preset difference is set to 0.5. In this way, when the difference of the third superheat degree of exhaust gas is less than or equal to the preset difference, it indicates that the third superheat degree of exhaust gas is within the target superheat degree of exhaust gas - superheat degree of exhaust gas dead zone range. When the difference of the third superheat degree of exhaust gas is greater than the preset difference, it indicates that the third superheat degree of exhaust gas is outside the target superheat degree of exhaust gas + superheat degree of exhaust gas dead zone range.
[0067] Exemplarily, the first preset adjustment value is set to 0. That is, it can continue to operate according to the current opening of the electronic expansion valve when the difference of the third superheat degree of exhaust gas is less than or equal to the preset difference.
[0068] In this disclosed embodiment, by calculating the target adjustment value through the above algorithm, the target adjustment value can be made more accurate, thereby realizing real-time adjustment of the opening of the electronic expansion valve, and making the actual superheat degree of exhaust gas continuously approach the target superheat degree of exhaust gas; in the algorithm of this disclosed embodiment, only the differences between the most recent three superheat degrees of exhaust gas and the target superheat degree of exhaust gas are taken, which not only ensures the accuracy of the calculation result, but also has a small calculation amount and relatively better real-time performance.
[0069] Optionally, the processor adjusts the opening degree of the electronic expansion valve of the chiller according to the target adjustment value, including: when the absolute value of the target adjustment value is less than or equal to the second preset adjustment value, the processor adjusts the current opening degree of the electronic expansion valve according to the target adjustment value. And / or, when the absolute value of the target adjustment value is greater than the second preset adjustment value, the processor adjusts the current opening degree of the electronic expansion valve according to the second preset adjustment value.
[0070] It should be noted that the target adjustment value may be a positive value or a negative value. Exemplarily, the processor adjusts the current opening degree of the electronic expansion valve according to the target adjustment value, including: adjusting the target adjustment value on the basis of the current opening degree of the electronic expansion valve. For example, if the target adjustment value is a positive value, then the opening degree is increased on the basis of the current opening degree of the electronic expansion valve; if the target adjustment value is a negative value, then the opening degree is decreased on the basis of the current opening degree of the electronic expansion valve.
[0071] Exemplarily, the second preset adjustment value is obtained in the following manner: the processor determines the second preset adjustment value according to the current opening degree of the electronic expansion valve. Specifically, the processor calculates: the second preset adjustment value = the current opening degree of the electronic expansion valve × the fourth adjustment coefficient. Wherein, the value range of the fourth adjustment coefficient can be [25%, 35%]. More specifically, the value range of the fourth adjustment coefficient can be 30%. That is, the second preset adjustment value = the current opening degree of the electronic expansion valve × 30%.
[0072] In this disclosed embodiment, a range is set for the target adjustment value to be adjusted to avoid excessive adjustment of the opening degree of the electronic expansion valve. The reason is that each time the target adjustment value is increased on the basis of the current opening degree of the electronic expansion valve, the actual exhaust superheat can be increased or decreased to reach the target exhaust superheat. However, it takes a certain amount of time for the change in the exhaust superheat caused by adjusting the current opening degree of the electronic expansion valve, and there will be a certain lag in the performance of the actual exhaust superheat during this period, which is likely to cause excessive adjustment. Therefore, by setting a range for the target adjustment value, the target adjustment value has an adjustment upper limit. In this way, excessive adjustment can be avoided, so that the chiller can reach a more efficient and stable operating state. For example, if the current opening degree of the electronic expansion valve is 50%, then the second preset adjustment value is 15%. If the target adjustment value is 17%, then adjust 15% (the second preset adjustment value) on the basis of the current opening degree of the electronic expansion valve; if the target adjustment value is 13%, then adjust 13% (the target adjustment value) on the basis of the current opening degree of the electronic expansion valve.
[0073] Optionally, the processor adjusts the current opening degree of the electronic expansion valve according to the target adjustment value, including: based on the current opening degree of the electronic expansion valve, the processor controls the current opening degree of the electronic expansion valve to adjust the target adjustment value at a preset adjustment rate.
[0074] Exemplarily, the preset adjustment rate is set according to actual requirements.
[0075] In this disclosed embodiment, by adjusting the target adjustment value at the preset adjustment rate, it is possible to further avoid excessive adjustment, so that the adjustment of the opening degree of the electronic expansion valve is always within a safe and stable range. For example, if the target adjustment value is 20% and the preset adjustment rate is 5% / s, then when adjusting the target adjustment value, it increases by 5% per second and it takes 4 s to complete the adjustment of the current opening degree of the electronic expansion valve.
[0076] It should be noted that the opening degree of the electronic expansion valve needs to be within the range of [0, 100%].
[0077] As Figure 3 shown, this disclosed embodiment provides another control method for a water chiller. The control method includes:
[0078] S301, the processor continuously detects multiple exhaust temperatures of the compressor of the water chiller at preset time intervals.
[0079] S302, the processor respectively calculates △T = Td - Tc to obtain multiple exhaust superheats of the water chiller.
[0080] Among them, the multiple exhaust superheats sequentially include a first exhaust superheat, a second exhaust superheat, and a third exhaust superheat in chronological order.
[0081] S303, the processor respectively calculates the differences between the first exhaust superheat, the second exhaust superheat, and the third exhaust superheat and the target exhaust superheat to obtain corresponding first exhaust superheat differences, second exhaust superheat differences, and third exhaust superheat differences.
[0082] S304, the processor determines whether the third exhaust superheat difference is greater than a preset difference? If so, go to step S305; if not, go to step S306.
[0083] S305, the processor calculates △U(K) = Kp×(E(t) - E(t - 1)) + Ki×E(t) + Kd×(E(t) - 2E(t - 1) + E(t - 2)) to obtain the target adjustment value.
[0084] S306, the processor determines the first preset adjustment value as the target adjustment value.
[0085] S307, the processor determines whether the absolute value of the target adjustment value is greater than a second preset adjustment value? If so, go to step S308; if not, go to step S309.
[0086] S308, the processor adjusts the current opening degree of the electronic expansion valve according to the second preset adjustment value.
[0087] In S309, the processor adjusts the current opening degree of the electronic expansion valve according to the target adjustment value.
[0088] In this embodiment, the implementation process of this method is demonstrated. The opening degree of the electronic expansion valve adjusted according to multiple exhaust superheat degrees and the target exhaust superheat degree can be more accurate, so that the actual opening degree of the electronic expansion valve is closer to the target opening degree, and further enables the water chiller to reach a more efficient operating state. At the same time, over-adjustment is avoided, making the operation of the water chiller safer and more stable.
[0089] Combined with Figure 4 As shown, an embodiment of the present disclosure provides a control device 200 for a water chiller, including an acquisition module 21, a determination module 22, and an adjustment module 23. The acquisition module 21 is configured to continuously obtain multiple exhaust superheat degrees of the water chiller at preset time intervals; wherein, the number of multiple exhaust superheat degrees is greater than or equal to 3; the determination module 22 is configured to determine a target adjustment value according to the multiple exhaust superheat degrees and the target exhaust superheat degree; the adjustment module 23 is configured to adjust the opening degree of the electronic expansion valve of the water chiller according to the target adjustment value.
[0090] Using the control device 200 for a water chiller provided by the embodiment of the present disclosure is beneficial to making the opening degree of the adjusted electronic expansion valve more accurate, so that the actual opening degree of the electronic expansion valve is consistent with the ideal value, and further enables the water chiller to reach a more efficient operating state.
[0091] Combined with Figure 5 As shown, an embodiment of the present disclosure provides a control device 300 for a water chiller, including a processor 500 and a memory 501. Optionally, the device may further include a communication interface 502 and a bus 503. Among them, the processor 500, the communication interface 502, and the memory 501 can complete mutual communication through the bus 503. The communication interface 502 can be used for information transmission. The processor 500 can call the logical instructions in the memory 501 to execute the control method for the water chiller in the above embodiment.
[0092] In addition, when the logical instructions in the above-mentioned memory 501 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.
[0093] The memory 501, being a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 500 executes functional applications and data processing by running the program instructions / modules stored in the memory 501, that is, implements the control method for the water chiller in the above embodiments.
[0094] The memory 501 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 501 may include high-speed random access memory and may also include non-volatile memory.
[0095] Combined with Figure 6 As shown, the embodiments of the present disclosure provide a water chiller 1, including: a water chiller body and the above control device 200(300) for the water chiller. The control device 200(300) for the water chiller is installed on the water chiller body. The installation relationship described here not only includes being placed inside the water chiller body, but also includes installation connections with other components of the water chiller 1, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the control device 200(300) for the water chiller can be adapted to a feasible water chiller main body, thereby implementing other feasible embodiments.
[0096] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above control method for the water chiller.
[0097] The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, such as: USB flash drive, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk, or optical disk, etc., which are various media that can store program codes.
[0098] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing the embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations including one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or device comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.
[0099] Those skilled in the art will realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.
[0100] In the embodiments disclosed in this document, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the couplings or direct couplings or communication connections shown or discussed among each other can be through some interfaces. The indirect couplings or communication connections of devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.
[0101] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.
Claims
1. A control method for a chiller, characterized in that, Including: Continuously obtaining multiple exhaust superheats of a chiller at preset time intervals, as well as a target exhaust superheat; wherein the number of the multiple exhaust superheats is greater than or equal to 3; Determining a target adjustment value according to the multiple exhaust superheats and the target exhaust superheat; Adjusting the opening degree of an electronic expansion valve of the chiller according to the target adjustment value.
2. The control method according to claim 1, characterized in that, The multiple exhaust superheats sequentially include a first exhaust superheat, a second exhaust superheat, and a third exhaust superheat in chronological order; determining the target adjustment value according to the multiple exhaust superheats and the target exhaust superheat includes: Calculating the differences between the first exhaust superheat, the second exhaust superheat, and the third exhaust superheat and the target exhaust superheat respectively, to obtain corresponding first exhaust superheat difference, second exhaust superheat difference, and third exhaust superheat difference; Determining the target adjustment value according to the first exhaust superheat difference, the second exhaust superheat difference, and the third exhaust superheat difference.
3. The control method according to claim 2, wherein Determining the target adjustment value according to the first exhaust superheat difference, the second exhaust superheat difference, and the third exhaust superheat difference includes: When the third exhaust superheat difference is greater than a preset difference, calculating △U(K)=Kp×(E(t)-E(t - 1))+Ki×E(t)+Kd×(E(t)-2E(t - 1)+E(t - 2)) to obtain the target adjustment value; wherein, △U(K) is the target adjustment value, E(t) is the third exhaust superheat difference, E(t - 1) is the second exhaust superheat difference, E(t - 2) is the first exhaust superheat difference, Kp is the first adjustment coefficient, Ki is the second adjustment coefficient, and Kd is the third adjustment coefficient; and / or, When the third exhaust superheat difference is less than or equal to the preset difference, determining the first preset adjustment value as the target adjustment value.
4. The control method according to claim 1, characterized in that Adjusting the opening degree of the electronic expansion valve of the chiller according to the target adjustment value includes: When the absolute value of the target adjustment value is less than or equal to a second preset adjustment value, adjusting the current opening degree of the electronic expansion valve according to the target adjustment value; and / or, When the absolute value of the target adjustment value is greater than the second preset adjustment value, adjusting the current opening degree of the electronic expansion valve according to the second preset adjustment value.
5. The control method according to claim 4, characterized in that, Obtaining the second preset adjustment value in the following manner: Determining the second preset adjustment value according to the current opening degree of the electronic expansion valve.
6. The control method according to claim 4, wherein Adjusting the current opening degree of the electronic expansion valve according to the target adjustment value includes: Based on the current opening degree of the electronic expansion valve, controlling the current opening degree of the electronic expansion valve to adjust the target adjustment value at a preset adjustment rate.
7. The control method according to any one of claims 1 to 6, characterized in that, Obtaining the multiple exhaust superheats of the chiller in the following manner: Continuously detecting multiple exhaust temperatures of a compressor of the chiller at preset time intervals; Calculating △T = Td - Tc respectively to obtain the multiple exhaust superheats of the chiller; wherein, △T is the multiple exhaust superheats, Td is the multiple exhaust temperatures, and Tc is the saturation temperature.
8. A control device for a chiller, characterized in that, Including: An acquisition module configured to continuously obtain multiple exhaust superheats of a chiller at preset time intervals; wherein the number of the multiple exhaust superheats is greater than or equal to 3; A determination module configured to determine a target adjustment value according to the multiple exhaust superheats and the target exhaust superheat; The adjustment module is configured to adjust the opening degree of the electronic expansion valve of the chiller according to the target adjustment value.
9. A control device for a chiller, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the control method for the chiller according to any one of claims 1 to 7 when running the program instructions.
10. A water chiller, characterized in that, Comprising: The chiller body; And, The control device for the chiller according to claim 8 or 9 is installed on the chiller body.