Method and device for controlling water chilling unit, water chilling unit and computer readable storage medium

Abstract

The invention relates to the technical field of water chilling units, and discloses a method for controlling a water chilling unit, which comprises the following steps: calculating a first pressure difference value between the pressure of a flash evaporator and the pressure of an evaporator; determining an opening correction value according to the first pressure difference value; and the actual opening degree of the gulp valve is determined according to the opening degree correction value. And determining the air supply pressure of the flash evaporator and the air supply amount required by the compressor by calculating a first pressure difference value between the pressure of the flash evaporator and the pressure of the evaporator. And according to the first pressure difference value, the opening degree of the gulp valve is determined to ensure that the gas supplementing pressure of the flash evaporator can meet the gas supplementing requirement of the compressor. And according to the opening correction value, the adjustment mode of the opening of the gulp valve is determined, so that the control precision of the gas supply pressure of the flash evaporator is improved by adjusting the opening of the gulp valve, and then the working efficiency and reliability of the water chilling unit are guaranteed. The invention further discloses a device for controlling the water chilling unit, the water chilling unit and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of chillers, for example, to a method and device for controlling a chiller, a chiller, and a computer-readable storage medium. Background Art

[0002] With the improvement of living standards, people's requirements for indoor environments are becoming increasingly demanding, and air conditioning is becoming increasingly widespread. Centrifugal chillers, due to their large cooling capacity and high Coefficient of Performance (COP), are widely used in large public buildings. However, the energy consumption of chillers is also very high. Reducing chiller operating energy consumption and improving their efficiency and reliability are key research areas.

[0003] To solve the above problems, a centrifugal chiller energy-saving control method is provided in the related art, comprising the following steps: Step S01, when the unit is started, the controller issues an instruction to adjust the air supply valve opening to 30%; Step S02, when the unit is operating normally, the controller reads the water flow and inlet and outlet water temperatures on the evaporator side, calculates the load rate of the unit, and then makes a judgment: if the load rate of the unit is lower than 30%, proceed to Step S03; Step S03, when the controller issues an instruction, the air supply valve opening is maintained at 30%; if the load rate of the unit is greater than 30%, proceed to Step S04; Step S04, the controller issues an instruction to adjust the air supply valve opening to be linearly related to the unit load rate.

[0004] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0005] To ensure energy savings, the aforementioned solution implemented certain control operations on the air supply valve. However, this simultaneously opened the air supply valve when the chiller was turned on, posing a reliability risk to the chiller's startup.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to ordinary technicians in this field. Summary of the Invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical elements or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] Embodiments of the present disclosure provide a method and apparatus for controlling a chiller, a chiller, and a computer-readable storage medium to improve the control accuracy of the gas replenishment pressure, thereby ensuring the working efficiency of the chiller and the operating reliability of the chiller.

[0009] In some embodiments, the above method includes: calculating a first pressure difference between the flash tank pressure and the evaporator pressure; determining an opening correction value according to the first pressure difference; and determining the actual opening of the gas replenishment valve according to the opening correction value.

[0010] Optionally, determining the actual opening of the gas replenishment valve according to the opening correction value includes: when the opening correction value is less than or equal to the correction threshold, determining that the actual opening of the gas replenishment valve remains unchanged at the current opening value; when the opening correction value is greater than the correction threshold, determining the target opening value of the gas replenishment valve and adjusting the gas replenishment valve to the target opening value.

[0011] Optionally, determining the target opening value of the gas replenishment valve includes: obtaining the current opening value of the gas replenishment valve; calculating the sum of the opening values of the current opening value and the opening correction value; and configuring the sum of the opening values as the target opening value.

[0012] Optionally, determining the target opening value of the gas replenishment valve includes: obtaining the current opening value of the gas replenishment valve; and configuring the product of the current opening value and the opening correction value as the target opening value.

[0013] Optionally, when the opening correction value is greater than the correction threshold, it further includes: determining an adjustment duration according to the first pressure difference; and controlling the gas replenishment valve to operate at the target opening value for the adjustment duration.

[0014] Optionally, determining the opening correction value according to the first pressure difference includes: calculating a second pressure difference between the first pressure difference and the set pressure value; and determining the opening correction value according to the first pressure difference and the second pressure difference.

[0015] Optionally, determining the opening correction value according to the first pressure difference and the second pressure difference includes: determining a correction coefficient according to the first pressure difference; and configuring the product of the correction coefficient and the second pressure difference as the opening correction value.

[0016] In some embodiments, the above apparatus includes: a processor and a memory storing program instructions, and the processor is configured to execute the method for controlling a chiller as described above when running the program instructions.

[0017] In some embodiments, the above chiller includes: a chiller body; and the apparatus for controlling a chiller as described above, which is installed on the chiller body.

[0018] In some embodiments, the above computer-readable storage medium stores program instructions that, when running, execute the method for controlling a chiller as described above.

[0019] The method and device for controlling a chiller, the chiller, and the computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] By calculating the first pressure difference between the flash tank pressure and the evaporator pressure, the make-up air pressure of the flash tank and the required make-up air volume of the compressor are determined. According to the first pressure difference, the opening degree of the make-up air valve is determined to ensure that the make-up air pressure of the flash tank can meet the make-up air demand of the compressor. According to the opening degree correction value, the adjustment method of the make-up air valve opening degree is determined to ensure that the actual opening degree of the make-up air valve after adjustment can reach the make-up air demand of the compressor. Thus, the control accuracy of the flash tank make-up air pressure is improved by adjusting the opening degree of the make-up air valve, and further the working efficiency of the chiller and the operation reliability of the chiller are ensured.

[0021] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 scale limitation, and among them:

[0023] Figure 1 is a schematic diagram of a method for controlling a chiller provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of another method for controlling a chiller provided by an embodiment of the present disclosure;

[0025] Figure 3 is a schematic diagram of another method for controlling a chiller provided by an embodiment of the present disclosure;

[0026] Figure 4 is a schematic diagram of a device for controlling a chiller provided by an embodiment of the present disclosure;

[0027] Figure 5 is a schematic diagram of another device for controlling a chiller provided by an embodiment of the present disclosure;

[0028] Figure 6 is a schematic diagram of a chiller provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order 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 attached drawings are for reference and illustration only 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 full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be shown in a simplified manner to simplify the drawings.

[0030] 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 can 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.

[0031] Unless otherwise specified, the term "plurality" means two or more.

[0032] 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.

[0033] The term "and / or" is a description of the associated relationship of an object and indicates that three relationships can exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0034] 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.

[0035] In addition, the term "set" should be understood in a broad sense.

[0036] 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.

[0037] In the disclosed embodiments, a terminal device refers to an electronic device having a wireless connection function. The terminal device can communicate with a smart home appliance device by connecting to the Internet, or can directly communicate with the smart home appliance device by means of Bluetooth, WiFi, etc. In some embodiments, the terminal device is, for example, a mobile device, a computer, or an in-vehicle device built in a hover vehicle, etc., or any combination thereof. The mobile device may include, for example, a mobile phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, etc., or any combination thereof. Among them, the wearable device includes, for example: a smart watch, a smart bracelet, a pedometer, etc.

[0038] An embodiment of the present disclosure provides a chiller, which includes a compressor, an evaporator, and a flash tank. The flash tank is disposed between the gas replenishing port of the compressor and the evaporator, and the opening degree of the gas replenishing valve is adjusted to meet the gas replenishing requirement of the compressor. When the chiller starts, the gas replenishing valve is in a closed state. When the chiller tends to operate stably, the gas replenishing valve is controlled to gradually open to adapt to the gas replenishing requirements of the compressor under different working conditions, thereby improving the operation reliability of the chiller while optimizing the working efficiency of the chiller and prolonging the service life of the chiller.

[0039] Combined with Figure 1 As shown, an embodiment of the present disclosure provides a method for controlling a chiller, including:

[0040] S110, the processor calculates a first pressure difference between the flash tank pressure and the evaporator pressure.

[0041] S120, the processor determines an opening degree correction value according to the first pressure difference.

[0042] S130, the processor determines the actual opening degree of the gas replenishing valve according to the opening degree correction value.

[0043] By using the method for controlling a chiller provided by the embodiment of the present disclosure, the control accuracy of the gas replenishing pressure can be effectively improved, and further the working efficiency and operation stability of the chiller can be ensured. By calculating the first pressure difference between the flash tank pressure and the evaporator pressure, the gas replenishing pressure of the flash tank and the required gas replenishing amount of the compressor are determined. According to the first pressure difference, the opening degree of the gas replenishing valve is determined to ensure that the gas replenishing pressure of the flash tank can meet the gas replenishing requirement of the compressor. According to the opening degree correction value, the adjustment method of the opening degree of the gas replenishing valve is determined to ensure that the actual opening degree of the gas replenishing valve after adjustment can reach the gas replenishing requirement of the compressor. Thus, the control accuracy of the gas replenishing pressure of the flash tank is improved by adjusting the opening degree of the gas replenishing valve, and further the working efficiency and operation reliability of the chiller are ensured.

[0044] Among them, the flash tank pressure can be obtained from relevant data collected by a sensor disposed at the fluid inlet of the gas replenishing valve. The gas replenishing pressure of the flash tank can be obtained from relevant data collected by a sensor disposed at the gas replenishing port of the compressor.

[0045] Combined with Figure 2 As shown, an embodiment of the present disclosure provides another method for controlling a chiller, including:

[0046] S210, the processor calculates a first pressure difference between the flash tank pressure and the evaporator pressure.

[0047] S220, the processor determines an opening degree correction value according to the first pressure difference.

[0048] S230, the processor determines whether the opening correction value is greater than the correction threshold. If so, step S241 is executed; if not, step S251 is executed.

[0049] S241, the processor determines the target opening value of the air make-up valve.

[0050] S242, the processor adjusts the air make-up valve to the target opening value.

[0051] S251, the processor determines that the target opening value of the air make-up valve is the current opening value.

[0052] S252, the processor controls the air make-up valve to maintain the current opening value.

[0053] By using the method for controlling a chiller provided in the embodiments of the present disclosure, the control accuracy of the air make-up pressure of the flash evaporator can be improved, thereby ensuring the working efficiency of the chiller and the operation reliability of the chiller. When the air make-up amount is close to the air make-up demand of the compressor, if the single opening adjustment of the valve is too large, it is easy to cause the situation that the opening needs to be adjusted repeatedly. Therefore, based on the magnitude relationship between the opening correction value and the correction threshold, it is determined whether there is a risk of excessive adjustment of the current opening. When the opening correction value is less than or equal to the correction threshold, it is considered that adjusting the opening of the valve may result in the need for repeated adjustment. Therefore, at this time, it is determined that the current opening of the air make-up valve can meet the current air make-up demand of the compressor. When there is still a certain gap between the air make-up amount and the air make-up demand of the compressor, a relatively large amount of valve opening can be adjusted at one time to quickly adjust the air make-up amount to the air make-up amount required by the compressor. Therefore, at this time, a larger valve opening value can be determined to ensure the adjustment efficiency of the chiller and the operation reliability of the chiller.

[0054] Optionally, when the processor determines the target opening value of the air make-up valve, it includes: the processor obtains the current opening value of the air make-up valve. The processor calculates the sum of the opening values of the current opening value and the opening correction value. The processor configures the sum of the opening values as the target opening value.

[0055] In this way, by using the sum of the current opening value and the opening correction value as the target opening value, the opening of the air make-up valve can be adjusted quickly. When the current air make-up amount is too much compared with the air make-up amount required by the compressor, this method can ensure the relatively stable operation of the chiller during the adjustment process and make the chiller quickly tend to a stable operation state, further improving the operation efficiency and operation reliability of the chiller.

[0056] Optionally, when the opening correction value is less than or equal to the correction threshold, it further includes: the processor obtains the current opening value of the air make-up valve. The processor configures the product of the current opening value and the opening correction value as the target opening value.

[0057] In this way, the reliability and working efficiency of the chiller can be better ensured. To avoid the situation where the opening of the regulating valve needs to be repeatedly adjusted to stabilize the chiller. Therefore, when the opening correction value is less than or equal to the correction threshold, the opening of the air supplement valve can be adjusted according to a certain proportion of the current opening value of the air supplement valve, so as to avoid the need for further reverse adjustment of the valve opening caused by excessive opening adjustment. That is, the product of the current opening value and the opening correction value is configured as the target opening value, so as to avoid excessive single opening adjustment, and thus more precisely adjust the air supplement amount to meet the optimal requirements of the compressor, further improving the working efficiency of the chiller and ensuring the reliability of the chiller operation.

[0058] At this time, when the opening correction value is less than or equal to the correction threshold, the degree of opening adjustment gradually decreases during each adjustment process of reducing the opening of the air supplement valve, and the degree of opening adjustment gradually increases during each adjustment process of increasing the opening of the air supplement valve.

[0059] Optionally, the processor determines the opening correction value according to the first pressure difference, including: the processor calculates the second pressure difference between the first pressure difference and the set pressure value. The processor determines the opening correction value according to the first pressure difference and the second pressure difference.

[0060] In this way, the opening adjustment of the air supplement valve can be accurately determined. By calculating the second pressure difference between the first pressure difference and the set pressure value, the accuracy of the opening adjustment of the air supplement valve is further improved. Thus, the processor can determine the opening correction value related to the first pressure difference and the second pressure difference based on a preset correspondence such as a table or a curve. Furthermore, the opening adjustment of the air supplement valve is ensured to guarantee the operation efficiency of the chiller.

[0061] The processor determines the opening correction value according to the first pressure difference and the second pressure difference, including: the processor determines the correction coefficient according to the first pressure difference. The processor configures the product of the correction coefficient and the second pressure difference as the opening correction value.

[0062] In this way, the opening adjustment of the air supplement valve can be accurately determined to ensure the reliability of the chiller operation. Through a preset correspondence such as a table or a curve, the correction coefficient corresponding to the first pressure difference is determined. To further improve the accuracy of the opening adjustment of the air supplement valve. The correction coefficient is further optimized by multiplying the correction coefficient by the second pressure difference, so as to ensure that the opening adjustment of the air supplement valve can guarantee the efficiency of the chiller tending to a stable operation state, and at the same time avoid large fluctuations during the adjustment process.

[0063] Specifically, taking the set pressure value as 50 KPa and the processor determining the correction coefficient as 0.2 according to the first pressure difference as an example. If the first pressure difference obtained by the processor by subtracting the evaporator pressure from the flash tank pressure is 65 KPa, then the second pressure difference obtained by subtracting the set pressure value from the first pressure difference is 15 KPa. At this time, the opening correction value is configured according to the product of the correction coefficient and the second pressure difference, which is 3 KPa, that is, the opening correction value is 3%, and it is increased by 3% on the basis of the current opening value. If the first pressure difference obtained by the processor by subtracting the evaporator pressure from the flash tank pressure is 40 KPa, then the second pressure difference obtained by subtracting the set pressure value from the first pressure difference is -10 KPa. At this time, the opening correction value is configured according to the product of the correction coefficient and the second pressure difference, which is -2 KPa, that is, the opening correction value is -2%, and after summing with the current opening value, it indicates that the air make-up valve needs to reduce the opening by 2% on the basis of the current opening value.

[0064] Optionally, after the processor calculates the first pressure difference between the flash tank pressure and the evaporator pressure, it further includes: when the first pressure difference is less than the shutdown threshold, the processor controls the air make-up valve to close and stop the air make-up operation.

[0065] Wherein, the shutdown threshold is used to represent the minimum pressure difference at which the compressor does not require air make-up.

[0066] In this way, when the first pressure difference is less than the shutdown threshold, it indicates that there is no air make-up requirement for the current compressor. At this time, controlling the air make-up valve to close can avoid excessive refrigerant entering the compressor due to the continuous opening of the air make-up valve, thereby increasing the energy consumption of the chiller. At the same time, it can avoid the adverse effects on the service life of the compressor caused by excessive refrigerant flow or pressure. Furthermore, the reliability of the chiller during operation is effectively guaranteed.

[0067] Combined with Figure 3 As shown, another method for controlling a chiller provided by an embodiment of the present disclosure includes:

[0068] S310, the processor calculates the first pressure difference between the flash tank pressure and the evaporator pressure.

[0069] S320, the processor determines the opening correction value according to the first pressure difference.

[0070] S330, the processor determines whether the opening correction value is greater than the correction threshold. If so, step S341 is executed; if not, step S351 is executed.

[0071] S341, the processor determines the target opening value of the air make-up valve.

[0072] S342, the processor adjusts the air make-up valve to the target opening value.

[0073] S351, the processor determines that the target opening value of the air make-up valve is the current opening value.

[0074] S352, the processor controls the air make-up valve to maintain the current opening value.

[0075] S361, the processor determines the adjustment duration according to the first pressure difference.

[0076] S362, the processor obtains the operation duration of the air make-up valve running continuously at the target opening value.

[0077] S363, the processor determines whether the operation duration is greater than the adjustment duration. If so, return to step S310; if not, return to step S362.

[0078] By using the method for controlling a chiller provided in the embodiments of the present disclosure, the control accuracy of the air make-up pressure of the flash evaporator can be improved, thereby ensuring the working efficiency of the chiller and the reliability during the operation of the chiller. To avoid a large impact on the operation of the chiller due to excessive adjustment of the opening of the air make-up valve, the opening of the air make-up valve is adjusted periodically. When the operation duration after the adjustment of the opening of the air make-up valve reaches the adjustment duration, it indicates that adjusting the opening value of the air make-up valve again at this time will not cause a large impact on the operation of the chiller. At the same time, the data collected at this time can also more accurately reflect the operation state of the chiller under the actual working conditions. Therefore, calculate the first pressure difference between the flash evaporator pressure and the evaporator pressure again at this time to determine whether it is necessary to further adjust the opening of the air make-up valve, so as to ensure that the chiller can operate efficiently and reliably. Among them, the value of the adjustment duration is positively correlated with the value of the first pressure difference. Specifically, the value range of the adjustment duration is [5, 15] s.

[0079] In addition, the user can set the upper limit value of the single opening adjustment, that is, the upper limit value of the opening correction value, based on their own usage requirements or the actual working conditions of the chiller. During a single adjustment process, if the obtained opening correction value exceeds the upper limit value, the upper limit value is used as the opening correction value for this adjustment to adjust the opening of the air make-up valve. Among them, the upper limit value of the opening correction value can be |4|%.

[0080] Combined Figure 4 As shown, the embodiments of the present disclosure provide a device 400 for controlling a chiller, including: a calculation module 401, a first determination module 402, and a second determination module 403. The acquisition module 401 is configured to calculate the first pressure difference between the flash evaporator pressure and the evaporator pressure. The first determination module 402 is configured to determine the opening correction value according to the first pressure difference. The second control module 403 is configured to determine the actual opening of the air make-up valve according to the opening correction value.

[0081] By using the device 400 for controlling a chiller provided in the embodiments of the present disclosure, first, a first pressure difference between the flash tank pressure and the evaporator pressure is calculated by the calculation module 401 to determine the gas replenishing pressure of the flash tank and the current gas replenishing amount required by the compressor. Then, according to the first pressure difference, the first determination module 402 determines the opening degree of the gas replenishing valve that can ensure that the gas replenishing pressure of the flash tank can meet the gas replenishing requirement of the compressor. Finally, according to the opening degree correction value, the second control module 403 determines the adjustment method of the opening degree of the gas replenishing valve to ensure that the actual opening degree of the gas replenishing valve after adjustment can reach the gas replenishing requirement of the compressor. Thus, the control accuracy of the gas replenishing pressure of the flash tank is improved by adjusting the opening degree of the gas replenishing valve, and further, the working efficiency and the operation reliability of the chiller are ensured.

[0082] Combined with Figure 5 As shown, the embodiments of the present disclosure provide a device 500 for controlling a chiller, including a processor 501 and a memory 502. Optionally, the device may further include a communication interface 503 and a bus 504. Among them, the processor 501, the communication interface 503, and the memory 502 can complete mutual communication through the bus 504. The communication interface 503 can be used for information transmission. The processor 501 can call the logical instructions in the memory 502 to execute the method for controlling the chiller in the above embodiments.

[0083] In addition, when the logical instructions in the above memory 502 are implemented in the form of software function units and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0084] The memory 502, as 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 502 executes functional applications and data processing by running the program instructions / modules stored in the memory 502, that is, implements the method for controlling the chiller in the above embodiments.

[0085] The memory 502 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 502 may include a high-speed random access memory and may also include a non-volatile memory.

[0086] Combined with Figure 6As shown in the figure, an embodiment of the present disclosure provides a chiller, which includes a chiller main body and the above-mentioned device 400(500) for controlling the chiller. The device 400(500) for controlling the chiller is installed on the chiller main body. The installation relationship described here not only includes being placed inside the chiller, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the device 400(500) for controlling the chiller can be adapted to a feasible chiller main body, thereby implementing other feasible embodiments.

[0087] An embodiment of the present disclosure provides a storage medium storing computer-executable instructions, and the computer-executable instructions are set to execute the above-mentioned method for controlling a chiller.

[0088] The above-mentioned storage medium can be a transient storage medium or a non-transient storage medium.

[0089] The technical solution of an embodiment of the present disclosure can be embodied in the form of a software product. The 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 method described in the embodiment of the present disclosure. The aforementioned storage medium can be a non-transient storage medium, including: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, or it can also be a transient storage medium.

[0090] 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. 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 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 of 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 one..." does not exclude the presence of additional identical elements in the process, method, or device comprising the element. Herein, what each embodiment focuses on may be 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.

[0091] Those skilled in the art can 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 can depend on the specific application and design constraints of the technical solution. The skilled person can 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.

[0092] In the embodiments disclosed herein, 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 displayed or discussed couplings or direct couplings or communication connections to 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 can be or can not be physically separated. The components displayed as units can be or can not be physical units, that is, they can be located in one place or can be 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 physically exist alone, or two or more units can be integrated in one unit.

[0093] 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 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 a specified logical function. In some alternative implementations, the functions marked in the block 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, depending 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, depending on the functions involved. Each block in the block diagram and / or flowchart, and the combination 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 method for controlling a chiller, characterized in that, Comprising: Calculating a first pressure difference between the flash evaporator pressure and the evaporator pressure; Determining an opening correction value according to the first pressure difference; Determining the actual opening of the gas makeup valve according to the opening correction value.

2. The method according to claim 1, characterized in that, The determining the actual opening of the gas makeup valve according to the opening correction value includes: When the opening correction value is less than or equal to the correction threshold, determining that the actual opening of the gas makeup valve remains unchanged at the current opening value; When the opening correction value is greater than the correction threshold, determining the target opening value of the gas makeup valve and adjusting the gas makeup valve to the target opening value.

3. The method according to claim 2, wherein The determining the target opening value of the gas makeup valve includes: Obtaining the current opening value of the gas makeup valve; Calculating the sum of the opening values of the current opening value and the opening correction value; Configuring the sum of the opening values as the target opening value.

4. The method according to claim 2, wherein The determining the target opening value of the gas makeup valve includes: Obtaining the current opening value of the gas makeup valve; Configuring the product of the current opening value and the opening correction value as the target opening value.

5. The method according to claim 2, wherein When the opening correction value is greater than the correction threshold, it further includes: Determining an adjustment duration according to the first pressure difference; Controlling the gas makeup valve to operate at the target opening value for the adjustment duration.

6. The method according to any one of claims 1 to 5, characterized in that The determining the opening correction value according to the first pressure difference includes: Calculating a second pressure difference between the first pressure difference and the set pressure value; Determining the opening correction value according to the first pressure difference and the second pressure difference.

7. The method according to claim 6, characterized in that The determining the opening correction value according to the first pressure difference and the second pressure difference includes: Determining a correction coefficient according to the first pressure difference; Configuring the product of the correction coefficient and the second pressure difference as the opening correction value.

8. A device for controlling a chiller, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to execute the method for controlling a chiller as described in any one of claims 1 to 7 when running the program instructions.

9. A chiller, characterized in that, Comprising: The chiller body; And, 10. A computer-readable storage medium storing program instructions, characterized in that, The device for controlling a chiller as described in claim 8, which is installed on the chiller body. When the program instructions are running, they execute the method for controlling a chiller as described in any one of claims 1 to 7.

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