A control method, device, system and storage medium for a multi-channel chiller

Abstract

The present invention discloses a control method, device, system and storage medium for a multi-channel chiller. The control method includes: obtaining the current state parameters and target state parameters of the branch pipeline; determining the current control mode according to the relative size relationship between the current state parameters and the target state parameters, and each control mode is preset with multiple groups of preset PID parameter groups; selecting at least one group of target PID parameter groups from the preset PID parameter groups in the current control mode, and regulating the current state parameters according to at least one group of target PID parameter groups until the current state parameters are equal to the target state parameters. With the above scheme, during the operation of the chiller, PID adjustment parameters that match the current state of each branch pipeline of the chiller can be selected, so that the current state parameters can quickly and accurately reach the target state parameters, thereby improving the accuracy of the state parameter regulation of each pipeline of the chiller and expanding the application scope of the multi-channel chiller.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of chillers, and in particular to a control method, device, system and storage medium for a multi-channel chiller. Background Art

[0002] As a temperature control device, multi-channel chillers are widely used in various manufacturing fields. At present, the main pipeline of a multi-channel chiller is generally connected to multiple branch pipelines, and each branch pipeline can be used to control the temperature (for example, cooling or heating) of different equipment or different areas of the equipment. During the application of the multi-channel chiller, the state parameters in each branch pipeline need to be adjusted to the target state parameters required by the user. In the prior art, the adjustment accuracy of the state parameters corresponding to each pipeline of the multi-channel chiller is poor, which is difficult to meet the needs of some solutions with high requirements for the accuracy of the state parameters. Summary of the invention

[0003] In view of this, the present invention provides a control method, device, system and storage medium for a multi-channel chiller to improve the accuracy of regulating the state parameters of each pipeline of the chiller and expand the application scope of the multi-channel chiller.

[0004] In a first aspect, an embodiment of the present invention provides a control method for a multi-channel chiller, comprising:

[0005] Acquire current state parameters and target state parameters of the branch pipeline; the state parameters of the branch pipeline include at least temperature parameters, flow parameters and pressure parameters;

[0006] The current control mode is determined according to the relative size relationship between the current state parameter and the target state parameter; wherein the branch pipeline has multiple control modes, and multiple groups of preset PID parameter groups are preset in each of the control modes, and at least two of the PID parameter groups preset in the control modes have different adjustment amplitudes for the state parameters;

[0007] At least one target PID parameter group is selected from the preset PID parameter group under the current control mode, and the current state parameter is regulated according to at least one target PID parameter group until the current state parameter is equal to the target state parameter.

[0008] In a second aspect, an embodiment of the present invention further provides a control device for a multi-channel chiller, comprising:

[0009] A state parameter acquisition module, used to acquire current state parameters and target state parameters of the branch pipeline; the state parameters of the branch pipeline include flow parameters and pressure parameters;

[0010] A current control mode determination module is used to determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter; wherein the branch pipeline has multiple control modes, each of the control modes has multiple groups of preset PID parameter groups, and the preset PID parameter groups in different control modes are different;

[0011] A state parameter adjustment module is used to select at least one target PID parameter group from the preset PID parameter group under the current control mode, and adjust the current state parameter according to at least one target PID parameter group until the current state parameter is equal to the target state parameter.

[0012] In a third aspect, an embodiment of the present invention further provides a multi-channel chiller system, comprising:

[0013] one or more processors;

[0014] A storage device for storing one or more programs;

[0015] When the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the multi-channel chiller provided by the embodiment of the present invention.

[0016] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for the multi-channel chiller provided in an embodiment of the present invention.

[0017] The embodiment of the present invention provides a control method for a multi-channel chiller, firstly obtaining the current state parameters and target state parameters of the branch pipeline; secondly determining the current control mode according to the relative size relationship between the current state parameters and the target state parameters, wherein the branch pipeline has multiple control modes, and multiple groups of preset PID parameter groups are preset in each control mode, and there are at least two control modes in which the preset PID parameter groups have different adjustment amplitudes for the state parameters; then selecting at least one group of target PID parameter groups from the preset PID parameter groups in the current control mode, and adjusting the current state parameters according to at least one group of target PID parameter groups until the current state parameters are equal to the target state parameters. With the above scheme, during the operation of the chiller, PID adjustment parameters matching the current state of each branch pipeline of the chiller can be selected, so that the current state parameters can quickly and accurately reach the target state parameters, thereby improving the accuracy of the state parameter regulation of each pipeline of the chiller and expanding the application scope of the multi-channel chiller. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of a control method for a multi-channel chiller provided in Embodiment 1 of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a multi-channel chiller provided by an embodiment of the present invention;

[0020] Figure 3 A control logic diagram of a control method for a multi-channel chiller provided in Embodiment 2 of the present invention;

[0021] Figure 4 A schematic flow chart of a control method for a multi-channel chiller provided in Embodiment 3 of the present invention;

[0022] Figure 5 A control mode interface diagram provided by an embodiment of the present invention;

[0023] Figure 6 A schematic flow chart of a control method for a multi-channel chiller provided in Embodiment 4 of the present invention;

[0024] Figure 7 A schematic structural diagram of a control device for a multi-channel chiller provided in Example 6 of the present invention. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0026] It should be mentioned before discussing exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe various operations (or steps) as sequential processes, many operations therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to methods, functions, procedures, subroutines, subprograms, etc. In addition, the embodiments in the present invention and the features in the embodiments can be combined with each other without conflict.

[0027] The term “including” and its variations used in the present invention are open inclusions, that is, “including but not limited to.” The term “based on” means “based at least in part on.” The term “one embodiment” means “at least one embodiment.”

[0028] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish the corresponding contents, and are not used to limit the order or interdependence.

[0029] It should be noted that the modifications of "one" and "plurality" mentioned in the present invention are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0030] Embodiment 1

[0031] Figure 1 A flow chart of a control method for a multi-channel chiller provided in Example 1 of the present invention is provided. The method can be applied to adjusting state parameters of a multi-channel chiller. The method can be executed by a control device for a multi-channel chiller provided in an embodiment of the present invention, wherein the device can be implemented by software and / or hardware. For example, the control device can be a programmable logic controller (PLC), etc., but is not limited to this; the control device can be stored in or integrated in a multi-channel chiller system.

[0032] Figure 2 A schematic diagram of a multi-channel chiller provided in an embodiment of the present invention can be referred to Figure 2 The multi-channel chiller (hereinafter referred to as "chiller") comprises a chiller housing 1, a main pipeline 2, and a plurality of branch pipelines 3. The chiller housing 1 contains cooling liquid and a temperature control device 4. The plurality of branch pipelines 3 are arranged in parallel and are respectively connected to the main pipeline 2. The cooling liquid flows out from the liquid outlet 10 of the chiller housing 1 ( Figure 2 The direction of the arrow in the middle indicates the flow direction of the coolant), and enters each branch pipe 3 through the first parallel node a of the main pipe 2; each branch pipe 3 is provided with a device to be temperature-adjusted 5, which may be a motor, a battery or a manufacturing device, etc., but is not limited thereto. The coolant flowing through each branch pipe 3 is heat-exchanged with the device to be temperature-adjusted 5 and then converges at the second parallel node b, and then flows back to the chiller housing 1 through the return liquid port 11 of the chiller housing 1. Among them, a bypass pipe 6 is also connected between the first parallel node a and the second parallel node b, and the bypass pipe 6 is arranged in parallel with each branch pipe 3.

[0033] like Figure 1 As shown, a control method for a multi-channel chiller provided in Embodiment 1 of the present invention comprises the following steps:

[0034] S110. Obtain current state parameters and target state parameters of the branch pipeline.

[0035] The state parameters of the branch pipelines include at least temperature parameters, flow parameters and pressure parameters. The current state parameters of the branch pipelines can be obtained based on the sensors set in each branch pipeline. Figure 2 As shown, the current temperature parameter can be collected by the temperature sensor 7 , the current flow parameter can be collected by the flow sensor 8 , and the current pressure parameter can be collected by the pressure sensor 9 .

[0036] It should be noted that the current state parameter and the target state parameter should be state parameters of the same type. For example, if the current state parameter is the current temperature parameter, the target state parameter is the target temperature parameter; if the current state parameter is the current flow parameter, the target state parameter is the target flow parameter; if the current state parameter is the current pressure parameter, the target state parameter is the target pressure parameter.

[0037] When using a chiller for cooling, the user can input various target state parameters in the chiller control interface, such as target temperature parameters, target flow parameters, and target pressure parameters. The target state parameters are the state parameters when the chiller reaches a stable working state.

[0038] It is understandable that, during the process of the chiller starting up and reaching a stable working state, the various state parameters of each branch pipe are constantly changing. In this embodiment, the current state parameters of the branch pipe can be obtained in real time based on the sensor in the branch pipe, and the target state parameters input by the user can be obtained at the same time.

[0039] S120: Determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter.

[0040] Among them, the branch pipeline has multiple control modes, and each control mode is preset with multiple groups of preset PID parameter groups. There are at least two control modes in which the preset PID parameter groups have different adjustment ranges for the state parameters. The control mode refers to the control method required for the branch pipeline when adjusting the current state parameter to the target state parameter. Exemplarily, if the difference between the current state parameter and the target state parameter is large, the current state parameter can be adjusted to the target state parameter by a large margin to increase the control rate. At this time, the branch pipeline can correspond to one control mode; if the difference between the current state parameter and the target state parameter is small, the current state parameter can be adjusted to the target state parameter by a small margin to avoid excessive adjustment of the state parameter. At this time, the branch pipeline can correspond to another control mode. Of course, in actual application, the division method of the adjustment mode is not limited to this, and those skilled in the art can divide different control modes according to actual needs.

[0041] A variety of control modes can be divided in the research and development design stage of the chiller control device, and each control mode corresponds to at least one group (two) of state parameters. In the actual application process, a control mode corresponding to a group of state parameters with the same relative size relationship as the current state parameters and the target state parameters can be determined, and this control mode is the current control mode.

[0042] It should be noted that the same control mode may correspond to multiple groups of state parameters, wherein the adjustment amplitude and / or adjustment direction between two state parameters in each group of state parameters are the same.

[0043] Furthermore, in an embodiment of the present invention, a Proportional-Integral-Differentiation (PID) algorithm may be used to adjust the current state parameters. PID control is to compare the collected data with a reference value, and then use the difference to calculate a new input value. The purpose of this new input value is to allow the system data to reach or remain at the reference value. Multiple groups of preset PID parameter groups may be preset in each control mode. The preset PID parameter groups may include adjustment parameters such as a proportional adjustment coefficient (Kp), an integral adjustment coefficient (Ki) and a differential adjustment coefficient (Kd), an upper limit value of a state parameter, a lower limit value of a state parameter, and a proportional coefficient. At least one adjustment parameter in different preset PID parameters is different.

[0044] In addition, since different control modes reflect the relative relationship between the current state parameters and the target state parameters, in this embodiment, different preset PID parameter groups can be set under different control modes, and each preset PID parameter group is used to quickly and accurately adjust the current state parameters to the target state parameters under the corresponding control mode.

[0045] Further, the preset PID parameter group corresponding to each adjustment mode can be obtained in advance based on testing or algorithms. It is understandable that, in general, in the research and development design stage of the chiller control device, the R&D personnel can set the various state parameters of the chiller branch pipe to change within a certain range according to user needs. For example, for a chiller, the highest temperature, lowest temperature, highest pressure, lowest pressure, highest flow rate and lowest flow rate that can be reached in its branch pipe can all be pre-designed and determined. In this embodiment, in each control mode, the optimal PID parameter group required for adjusting various state parameters between any two parameter values ​​(such as the first temperature parameter value and the second temperature parameter value) can be obtained in advance. The optimal PID parameter group is a set of preset PID parameter groups; the first temperature parameter value can be quickly and accurately adjusted to the second temperature parameter value using the optimal PID parameter group. Since the state parameter has a certain range of values, the preset PID parameter groups corresponding to different state parameters should also be multiple groups. After obtaining multiple groups of preset PID parameter groups, the multiple groups of preset PID parameter groups are pre-stored.

[0046] S130, selecting at least one target PID parameter group from the preset PID parameter groups in the current control mode, and controlling the current state parameters according to the at least one target PID parameter group until the current state parameters are equal to the target state parameters.

[0047] Furthermore, at different working moments of the chiller, the relative size between the current state parameter and the target state is different, that is, the current control mode may be different. In this embodiment, at least one set of target PID parameter groups matching the current state parameter and the target state parameter can be selected from the multiple sets of preset PID parameter groups corresponding to the current control mode, and then the current state parameter is adjusted according to the selected target PID parameter group, so that the current state parameter gradually approaches the target state parameter and finally stabilizes at the target state parameter.

[0048] Under this setting method, the most suitable PID parameter group can be selected according to the real-time operating status of the branch pipeline. During the entire control process, the state parameters of the branch pipeline may be adjusted according to multiple PID parameter groups so that the current state parameters can accurately reach the target state parameters. This greatly improves the problem of poor adjustment accuracy caused by selecting only one PID parameter group in the entire control process in the prior art.

[0049] A control method for a multi-channel chiller provided in the first embodiment of the present invention first obtains the current state parameters and target state parameters of the branch pipeline; secondly, the current control mode is determined according to the relative size relationship between the current state parameters and the target state parameters, wherein the branch pipeline has multiple control modes, and multiple groups of preset PID parameter groups are preset in each control mode, and there are at least two control modes in which the preset PID parameter groups have different adjustment ranges for the state parameters; then, at least one group of target PID parameter groups is selected from the preset PID parameter groups in the current control mode, and the current state parameters are adjusted according to at least one group of target PID parameter groups until the current state parameters are equal to the target state parameters. Using the above method, it is possible to select PID adjustment parameters that match the current state of each branch pipeline of the chiller, so that the current state parameters can quickly and accurately reach the target state parameters, thereby improving the accuracy of the state parameter regulation of each pipeline of the chiller and expanding the application scope of the multi-channel chiller.

[0050] Based on the above embodiment, a variant embodiment of the above embodiment is proposed. It should be noted that in order to make the description concise, only the differences from the above embodiment are described in the variant embodiment.

[0051] Embodiment 2

[0052] In this embodiment, the branch pipeline has an ascending control mode, a descending control mode or a constant control mode; in the ascending control mode, multiple groups of first preset PID parameter groups are preset, in the descending control mode, multiple groups of second preset PID parameter groups are preset, and in the constant control mode, multiple groups of third preset PID parameter groups are preset, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the first preset PID parameter group, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the second preset PID parameter group. The above S120, determining the current control mode according to the relative size relationship between the current state parameter and the target state parameter, can be further refined as follows: when the current state parameter is smaller than the target state parameter, and the difference between the target state parameter and the current state parameter is greater than the first preset difference, it is determined that the branch pipeline is in the ascending control mode; when the current state parameter is greater than the target state parameter, and the difference between the current state parameter and the target state parameter is greater than the first preset difference, it is determined that the branch pipeline is in the descending control mode; when the difference between the current state parameter and the target state parameter is less than or equal to the first preset difference, it is determined that the branch pipeline is in the constant control mode. The above S130, selecting at least one group of target PID parameters from the preset PID parameter groups in the current control mode, and adjusting the current state parameters according to the at least one group of target PID parameter groups until the current state parameters are equal to the target state parameters, can be further refined as: when the current control mode is the ascending control mode, selecting at least one group of first target PID parameter groups from multiple groups of first preset PID parameter groups, and adjusting the current state parameters according to the at least one group of first target PID parameter groups until the current state parameters are equal to the target state parameters; when the current control mode is the descending control mode, selecting at least one group of second target PID parameter groups from multiple groups of second preset PID parameter groups, and adjusting the current state parameters according to the at least one group of second target PID parameter groups until the current state parameters are equal to the target state parameters; when the current control mode is the constant control mode, selecting at least one group of third target PID parameter groups from multiple groups of third preset PID parameter groups, and adjusting the current state parameters according to the at least one group of third target PID parameter groups until the current state parameters are equal to the target state parameters.

[0053] Among them, in the increasing control mode, the target state parameter is larger and the current state parameter is smaller, and the current state parameter needs to be controlled to increase by a larger margin; in the decreasing control mode, the target state parameter is smaller and the current state parameter is larger, and the current state parameter needs to be controlled to decrease by a larger margin; in the constant control mode, the current state parameter and the target state parameter are close, and the current state parameter needs to be controlled to decrease (or increase) by a smaller margin.

[0054] Therefore, the first preset PID parameter group preset in the ascending control mode and the second preset PID parameter group preset in the descending control mode both have a larger adjustment range for the state parameters, and the adjustment directions of the two are opposite; the third preset PID parameter group preset in the constant control mode has a relatively small adjustment range for the state parameters.

[0055] Figure 3 A control logic diagram of a control method for a multi-channel chiller provided in the second embodiment of the present invention is shown in FIG. Figure 3 As shown, a control method for a multi-channel chiller provided in the second embodiment of the present invention includes the following steps: first, the current state parameter and the target state parameter of the branch pipeline are obtained. This step is the same as in the above embodiment and will not be repeated here. Further, if the current state parameter is less than the target state parameter, and the difference between the two (referring to the larger target state parameter minus the smaller current state parameter) is greater than the first preset difference, it is considered that the branch pipeline is in the rising control mode; in the rising control mode, at least one group of first target state PID parameter groups matching the current state parameter and the target state parameter are selected from the first preset PID parameter group, and the current state parameter is adjusted according to the first target state PID parameter group. If the current state parameter is greater than the target state parameter, and the difference between the two (referring to the larger current state parameter minus the smaller target state parameter) is greater than the first preset difference, it is considered that the branch pipeline is in the falling control mode; in the falling control mode, at least one group of second target state PID parameter groups matching the current state parameter and the target state parameter are selected from the second preset PID parameter group, and the current state parameter is adjusted according to the second target state PID parameter group. If the current state parameter is slightly different from the target state parameter, for example, the difference between the two is less than or equal to the first preset difference, it is considered that the branch pipeline is in the constant control mode; in the constant control mode, at least one third target state PID parameter group matching the current state parameter and the target state parameter is selected from the third preset PID parameter group, and the current state parameter is adjusted according to the third target state PID parameter group. Further, it is determined whether the current state parameter is equal to the target state parameter. If so, it works stably under the target state parameter. If not, the above control process is continued.

[0056] Among them, the embodiment of the present invention does not limit the size of the first preset difference, and those skilled in the art can set it according to actual needs. It can be seen from the above that the state parameters of the branch pipeline include temperature parameters, flow parameters, and pressure parameters, etc. For different types of state parameters, the first preset difference is also different. Exemplarily, if you want to adjust the temperature parameter, the first preset difference should be a temperature value, such as 0.1~2℃, but not limited to this; if you want to adjust the flow parameter, the first preset difference should be a flow value, such as 0.1L / min~2L / min, but not limited to this; if you want to adjust the pressure parameter, the first preset difference should be a pressure value, such as 10~50KPa, but not limited to this.

[0057] For example, taking the temperature parameter as an example, if the target temperature parameter is 20°C and the current temperature parameter is 40°C, it can be determined that the branch pipeline is in the descending control mode. At this time, the target PID parameter group matching 40 to 20°C can be selected from the descending control mode, and the current temperature parameter can be adjusted according to the target PID parameter group; further, when the current temperature parameter reaches 22°C, the control mode is changed to the constant control mode. At this time, the target PID parameter group matching 22 to 20°C can be selected from the constant control mode, and the current temperature parameter can continue to be adjusted according to the target PID parameter group until the current temperature parameter reaches 20°C. The flow parameters and pressure parameters are similar to the above process and will not be described in detail.

[0058] It is understandable that the initial state parameters of each branch pipe when the chiller is started are generally quite different from the target state parameters. By adopting the technical solution in this embodiment, the target state parameters will go through at least two control modes from the initial state parameter adjustment, that is, they will be adjusted according to at least two sets of target PID parameter groups.

[0059] The technical solution in the second embodiment of the present invention can match a suitable target PID parameter group to each state parameter starting from the initial state parameter by dividing the control mode into an ascending control mode, a descending control mode and a constant control mode, and presetting the PID parameter group corresponding to each control mode. The existence of the constant control mode and the corresponding third preset PID parameter group can further ensure the precise control of the state parameters, avoiding the problem of insufficient or excessive regulation.

[0060] Embodiment 3

[0061] In this embodiment, multiple state parameter ranges are preset in each control mode, and the state parameter ranges correspond to the preset PID parameter groups one by one. Based on this, the "selecting at least one target PID parameter group from multiple preset PID parameter groups under the current control mode" in S130 in the above-mentioned embodiment 1 can be further refined into S231, determining the state parameter ranges to which the current state parameter and the target state parameter belong, and making all state parameter ranges covered by the current state parameter to the target state parameter the target state parameter range; S232, calling the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0062] Figure 4 A flow chart of a control method for a multi-channel chiller provided in the third embodiment of the present invention can be referred to Figure 4 In this embodiment, the control method includes:

[0063] S210: Obtain current state parameters and target state parameters of the branch pipeline.

[0064] S220: Determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter.

[0065] Among them, under the same control mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach can be divided into multiple state parameter ranges in order of numerical value, each state parameter range includes multiple state parameters, and the state parameter range and the preset PID parameter group are in a one-to-one correspondence. Under the same control mode, the number of state parameter ranges and preset PID parameter groups is not limited and can be set according to actual needs. For example, Figure 5 A control mode interface diagram provided by an embodiment of the present invention, such as Figure 5 As shown, in the ascending control mode, four first state parameter ranges (respectively labeled ① to ④) and four first preset PID parameter groups (respectively labeled 1 to 4) corresponding to the four first state parameter ranges can be set; in the descending control mode, four second state parameter ranges (respectively labeled ⑤ to ⑧) and four second preset PID parameter groups (respectively labeled 5 to 8) corresponding to the four second state parameter ranges can be set; in the constant control mode, four third state parameter ranges (respectively labeled ⑨ to ⑨) can be set ), and four third preset PID parameter groups (numbered 9 to 12 respectively) corresponding one by one to the four third state parameter ranges, but the actual setting method is not limited to this.

[0066] Still taking the temperature parameter as an example, if the minimum value of the temperature parameter can reach -20℃ and the maximum value can reach 120℃, then in the rising control mode, the four first temperature parameter ranges are -20~10℃, 10℃~40℃, 40~80℃, and 80~120℃ respectively. The boundary temperature parameter values ​​of two adjacent first preset temperature PID parameter groups in the same control mode are 10℃, 40℃, and 80℃ respectively. The division method of the temperature parameter range in the falling control mode and the constant control mode is the same as that in the rising control mode, but for the same temperature parameter range, the corresponding preset temperature PID parameter group in the falling control mode (or constant control mode) is different from that in the rising control mode.

[0067] For the flow parameter, if the minimum value of the flow parameter can be 5L / min and the maximum value can be 40L / min, then the four first flow parameter ranges in the ascending control mode are 0-5L / min, 5-15L / min, 15-25L / min, and 25-40L / min. The boundary flow parameter values ​​of the two adjacent first preset flow PID parameter groups in the same control mode are 5L / min, 15L / min, and 25L / min. The division method of the flow parameter range in the descending control mode and the constant control mode is the same as that in the ascending control mode, but for the same flow parameter range, the corresponding preset flow PID parameter group in the descending control mode (or constant control mode) is different from that in the ascending control mode.

[0068] For the pressure parameter, if the minimum value of the pressure parameter can be 0KPa and the maximum value can be 500KPa, the four first pressure parameter ranges in the rising control mode are 0-100KPa, 100-200KPa, 200-300KPa, and 300-500KPa respectively. The boundary pressure parameter values ​​of the two adjacent first preset pressure PID parameter groups in the same control mode are 100KPa, 200KPa, and 300KPa respectively. The division method of the pressure parameter range in the falling control mode and the constant control mode is the same as that in the rising control mode, but for the same pressure parameter range, the corresponding preset pressure PID parameter group in the falling control mode (or constant control mode) is different from that in the rising control mode.

[0069] S231, determine the state parameter ranges to which the current state parameter and the target state parameter belong, and define the entire state parameter range from the current state parameter to the target state parameter as the target state parameter range.

[0070] Further, it is determined in which state parameter range the current state parameter and the target state parameter are respectively located in the current control mode. If the current state parameter and the target state parameter are located in the same state parameter range (for example, the first state parameter range ②), the first state parameter range ② is defined as the target state parameter range; if the current state parameter range and the target state parameter range are located in different state parameter ranges (for example, the current state parameter is located in the first state parameter range ②, and the target state parameter is located in the first state parameter range ④), the first state parameter range ② to the first state parameter range ④ are defined as the target state parameter range.

[0071] S232. Call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0072] Further, a preset PID parameter group corresponding to the target state parameter range is selected as the target PID parameter group. Exemplarily, if the target state parameter range is the first state parameter range ②, the first target PID parameter group 2 is called, and if the target state parameter range is the first state parameter range ② to the first state parameter range ④, the first target PID parameter group 2 to the first target PID parameter group 4 are called as the target PID parameter group.

[0073] S233. Adjust the current state parameters according to at least one set of target PID parameter groups until the current state parameters are equal to the target state parameters.

[0074] Correspondingly, when the target PID parameter group is a group, the adjustment is performed according to the target PID parameter group; when the target PID parameter group is multiple groups, the current state parameters are adjusted according to the arrangement order of the target PID parameter groups. Exemplarily, if the target PID parameter group is the first target PID parameter group 2, the current state parameters are adjusted according to the first target PID parameter group 2; if the target PID parameter group is the first target PID parameter group 2 to the first target PID parameter group 4, the current state parameters are adjusted according to the first target PID parameter group 2 to the first target PID parameter group 4. If the control mode changes, the target PID parameter group under the changed control mode is called in the above manner, and the current state parameters are continuously adjusted until the current state parameters reach the target state parameters.

[0075] Embodiment 4

[0076] Figure 6A flowchart of a control method for a multi-channel chiller provided in the fourth embodiment of the present invention, in this embodiment, before executing S110 in the above embodiment 1 and obtaining the current state parameters and target state parameters of the branch pipeline, the following steps may also be performed: S300, determining the current working mode of the chiller, the types of state parameters regulated in different working modes are different; S301, determining the state parameters to be regulated according to the current working mode. S110 in the above embodiment 1 and obtaining the current state parameters and target state parameters of the branch pipeline can be further refined as follows: S311, obtaining the current state parameters and target state parameters of the branch pipeline that match the current working mode.

[0077] like Figure 6 As shown, the control method of this embodiment includes:

[0078] S300: Determine the current working mode of the chiller.

[0079] Among them, according to actual needs, the chiller includes different working modes, such as pressure control mode and flow control mode. It can be understood that in different working modes of the chiller, the types of state parameters that need to be adjusted are different. For example, the pressure control mode refers to the process of the chiller reaching the target temperature parameter, mainly controlling the pressure in the branch pipe to maintain at the target pressure parameter; the flow control mode refers to the process of the chiller reaching the target temperature parameter, mainly controlling the flow of a branch pipe to maintain at the target flow parameter. Generally, the user will input the required working mode when using the chiller. In this embodiment, the current working mode of the chiller set by the user can be detected and determined.

[0080] S301. Determine the state parameters to be adjusted according to the current working mode.

[0081] Furthermore, the state parameters that need to be adjusted in the current working mode are determined.

[0082] S311. Obtain current state parameters and target state parameters of the branch pipeline that matches the current working mode.

[0083] Furthermore, if the current working mode is the flow control mode, the current flow parameter and the target flow parameter are obtained; if the current working mode is the pressure control mode, the current pressure parameter and the target pressure parameter are obtained.

[0084] S320: Determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter.

[0085] S330, selecting at least one target PID parameter group from the preset PID parameter groups in the current control mode, and controlling the current state parameters according to the at least one target PID parameter group until the current state parameters are equal to the target state parameters.

[0086] Further, in the same manner as in the above embodiment, the current state parameters matching the current working mode are adjusted. The specific adjustment process is the same as in the above embodiment and will not be described in detail here.

[0087] Optionally, as a refinement of Example 4, the working mode may include a flow control mode and a pressure control mode. In the flow control mode, the flow parameters of the branch pipeline are regulated, and in the pressure control mode, the pressure parameters of the branch pipeline are regulated; the multiple control modes include multiple flow control modes and multiple pressure control modes; in the flow control mode, multiple groups of preset flow PID parameter groups are preset, and in the pressure control mode, multiple groups of preset pressure PID parameter groups are preset; S311 in the above Example 4, obtaining the current state parameters and target state parameters of the branch pipeline matching the current working mode, can be further refined as: when the current working mode is the flow control mode, obtaining the current flow parameters and target flow parameters of the branch pipeline; when the current working mode is the pressure control mode, obtaining the current pressure parameters and target pressure parameters of the branch pipeline; S320, determining the current control mode according to the relative size relationship between the current state parameters and the target state parameters, can be further refined as: when the current working mode is the flow control mode, determining the control mode according to the current flow parameters and the target flow parameters. The current flow control mode under the flow mode; when the current working mode is the pressure control mode, the current pressure control mode under the pressure control mode is determined according to the current pressure parameter and the target pressure parameter; S330, select at least one group of target PID parameters from the preset PID parameter group under the current control mode, and control the current state parameters according to at least one group of target PID parameter groups until the current state parameters are equal to the target state parameters, which can be further refined as: when the current working mode is the flow control mode, select at least one group of target flow PID parameters from multiple groups of preset flow PID parameter groups under the current flow control mode, and control the current flow parameters according to at least one group of target flow PID parameter groups until the current flow parameters reach the target flow parameters; when the current working mode is the pressure control mode, select at least one group of target pressure PID parameter groups from multiple groups of preset pressure PID parameter groups under the current pressure control mode, and control the current pressure parameters according to the target pressure PID parameter group until the current pressure parameters reach the target pressure parameters.

[0088] One point that needs to be explained is that the chiller is a temperature control device. During the operation of the chiller, the adjustment of the temperature parameters in its pipeline is a necessary adjustment step. Therefore, this embodiment does not further explain the temperature control mode, but only introduces the control method under the flow control and pressure control modes in detail.

[0089] Furthermore, in both the flow control mode and the pressure control mode, the branch pipeline can be in the rising control mode, the falling control mode or the constant control mode. In the flow control mode, the rising control mode of the branch pipeline is the rising flow control mode, the falling control mode is the falling flow control mode, and the constant control mode is the constant flow control mode; each flow control mode has multiple sets of preset flow PID parameter groups preset. In the pressure control mode, the rising control mode of the branch pipeline is the rising pressure control mode, the falling control mode is the falling pressure control mode, and the constant control mode is the constant pressure control mode, and each pressure control mode has multiple sets of preset pressure PID parameter groups preset.

[0090] The division of the flow control mode or the pressure control mode can refer to the division method of the control mode given in Example 1, and will not be described in detail here. In addition, the setting method of the corresponding preset flow PID parameter group and preset pressure PID parameter group under the flow control mode or the pressure control mode can also refer to Example 1.

[0091] Furthermore, in the flow control mode, the current flow parameters and the target flow parameters are obtained and compared. When the relative size relationship between the current flow parameters and the target flow parameters meets the relationship between the flow parameters in the increasing control mode in the above-mentioned embodiment 2, it can be determined that the current flow control mode enters the increasing flow control mode; when the relative size relationship between the current flow parameters and the target flow parameters meets the relationship between the flow parameters in the decreasing control mode in the above-mentioned embodiment 2, it can be determined that the current flow control mode enters the decreasing flow control mode; when the relative size relationship between the current flow parameters and the target flow parameters meets the relationship between the flow parameters in the constant control mode in the above-mentioned embodiment 2, it can be determined that the current flow control mode enters the constant flow control mode.

[0092] Correspondingly, in the pressure control mode, the current pressure parameter and the target pressure parameter are obtained and compared. When the relative size relationship between the current pressure parameter and the target pressure parameter meets the relationship between the pressure parameters in the increasing control mode in the above-mentioned embodiment 2, it can be determined that the current pressure control mode enters the increasing pressure control mode; when the relative size relationship between the current pressure parameter and the target pressure parameter meets the relationship between the pressure parameters in the decreasing control mode in the above-mentioned embodiment 2, it can be determined that the current pressure control mode enters the decreasing pressure control mode; when the relative size relationship between the current pressure parameter and the target pressure parameter meets the relationship between the pressure parameters in the constant control mode in the above-mentioned embodiment 2, it can be determined that the current pressure control mode enters the constant pressure control mode.

[0093] Furthermore, at least one set of target flow PID parameter groups (target pressure PID parameter groups) matching the current flow parameters (current pressure parameters) and the target flow parameters (target pressure parameters) are selected from the current flow control mode (current pressure control mode) corresponding to the flow control mode (pressure control mode), and then the current flow parameters (current pressure parameters) are regulated according to the target flow PID parameter group (target pressure PID parameter group), so that the current flow parameters (current pressure parameters) quickly and accurately reach the target flow parameters (target pressure parameters).

[0094] Optionally, in an optional embodiment of the present invention, S130 in the above-mentioned embodiment one, controlling the current state parameter according to at least one set of target PID parameter groups until the current state parameter is equal to the target state parameter, can be further refined as: controlling the opening of the electronic control valve in the branch pipeline according to at least one set of target PID parameter groups until the current state parameter is equal to the target state parameter.

[0095] Specifically, Figure 2 As shown, an electronic control valve 12 is installed in each branch pipeline 3, and the electronic control valve 12 can be used to control the current state parameter. In this embodiment, the adjustment parameters of the target PID parameter group may include the opening of the electronic control valve 12, and then the current state parameter (including the current temperature parameter, the current flow parameter or the current pressure parameter) is regulated by adjusting the opening of the electronic control valve 12.

[0096] For example, if the current flow parameter or the current pressure parameter in the branch pipeline needs to be increased, the opening of the electronic control valve can be increased, otherwise the opening of the electronic control valve can be reduced.

[0097] Embodiment 5

[0098] Optionally, in this embodiment, in addition to the step process in Embodiment 1, further additions may be made after S130: obtaining the current pressure value and target pressure value range of the main pipeline; determining the main pipeline target PID parameter group required for the main pipeline according to the current pressure value and the target pressure value range; and regulating the opening of the bypass valve in the bypass pipeline according to the main pipeline target PID parameter group until the current pressure value reaches the target pressure value range.

[0099] Those skilled in the art will understand that during the operation of the chiller, in addition to stabilizing parameters such as the flow rate and pressure in the branch pipe at the target values, the pressure in the main pipe should also be maintained within a safe pressure value range to improve the operating reliability and service life of the chiller and its components (such as water pumps, control valves and sensors, etc.) and reduce the number of chiller failures.

[0100] The target pressure value range of the main pipeline is the safety pressure value range, which can generally be set before the chiller leaves the factory or by the user. The embodiment of the present invention does not limit its specific value range.

[0101] Based on the above considerations, in this embodiment, Figure 2 As shown, the current pressure value of the main pipeline 2 can be obtained based on the pressure sensor 9 provided in the main pipeline 2, and the set target pressure value range of the main pipeline 2 can be obtained at the same time.

[0102] Furthermore, the main pipeline target PID parameter group can be determined according to the relative size relationship between the current pressure value and at least one target pressure value in the target pressure value range. The main pipeline target PID parameter group is the most preferred main pipeline PID parameter group required to adjust the current pressure value to at least one target pressure value in the target pressure value range.

[0103] As in the first embodiment, multiple sets of optimal main pipeline PID parameter groups when adjusting between multiple sets of different pressure values ​​can be obtained in advance based on tests or algorithms, and the multiple sets of main pipeline PID parameter groups can be pre-stored. In the actual control process, the main pipeline target PID parameter group that matches the current pressure value and at least one target pressure value can be called. Then, the current pressure value in the main pipeline is regulated according to the main pipeline target PID parameter group.

[0104] Further, continue to refer to Figure 2 Since the bypass pipe 6 is located between the two parallel nodes of the main pipe 2, the coolant flow in the bypass pipe 6 is related to the pressure of the main pipe 2. Therefore, in this embodiment, the opening of the bypass valve 13 in the bypass pipe 6 can be regulated according to the main pipe target PID parameter group so that the current pressure value meets the target pressure value range, ensuring that the pressure in the main pipe is always kept within a reasonable and safe range during the operation of the chiller.

[0105] Embodiment 6

[0106] Figure 7 Schematic diagram of the structure of a control device for a multi-channel chiller provided in Embodiment 6 of the present invention, the device is used to execute the control method for a multi-channel chiller provided in any embodiment of the present invention, such as Figure 7 As shown, the device comprises:

[0107] The state parameter acquisition module 100 is used to acquire the current state parameters and target state parameters of the branch pipeline; the state parameters of the branch pipeline include flow parameters and pressure parameters;

[0108] The current control mode determination module 200 is used to determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter; wherein the branch pipeline has multiple control modes, and each control mode has multiple groups of preset PID parameter groups, and the preset PID parameter groups in different control modes are different;

[0109] The state parameter adjustment module 300 is used to select at least one target PID parameter group from the preset PID parameter group in the current control mode, and adjust the current state parameter according to the at least one target PID parameter group until the current state parameter is equal to the target state parameter.

[0110] The control device of the multi-channel chiller provided in this embodiment can select PID adjustment parameters that match the current state of each branch pipe of the chiller, so that the current state parameters can quickly and accurately reach the target state parameters, thereby improving the accuracy of regulating the state parameters of each pipe of the chiller and expanding the application scope of the multi-channel chiller.

[0111] Further, in a further refined embodiment, the branch pipeline may have an ascending control mode, a descending control mode or a constant control mode; in the ascending control mode, multiple groups of first preset PID parameter groups are preset, in the descending control mode, multiple groups of second preset PID parameter groups are preset, and in the constant control mode, multiple groups of third preset PID parameter groups are preset, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the first preset PID parameter group, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the second preset PID parameter group;

[0112] The current control mode determination module 200 can also be used to determine that the branch pipeline is in an ascending control mode when the current state parameter is less than the target state parameter and the difference between the target state parameter and the current state parameter is greater than a first preset difference; determine that the branch pipeline is in a descending control mode when the current state parameter is greater than the target state parameter and the difference between the current state parameter and the target state parameter is greater than the first preset difference; determine that the branch pipeline is in a constant control mode when the difference between the current state parameter and the target state parameter is less than or equal to the first preset difference.

[0113] The state parameter adjustment module 300 can also be used to select at least one first target PID parameter group from multiple first preset PID parameter groups when the current control mode is an ascending control mode, and adjust the current state parameter according to the at least one first target PID parameter group until the current state parameter is equal to the target state parameter; when the current control mode is a descending control mode, select at least one second target PID parameter group from multiple second preset PID parameter groups, and adjust the current state parameter according to the at least one second target PID parameter group until the current state parameter is equal to the target state parameter; when the current control mode is a constant control mode, select at least one third target PID parameter group from multiple third preset PID parameter groups, and adjust the current state parameter according to the at least one third target PID parameter group until the current state parameter is equal to the target state parameter.

[0114] On the basis of the above optimization, multiple state parameter ranges are preset in each control mode, and the state parameter ranges correspond to the preset PID parameter groups one by one; the state parameter adjustment module may include a state parameter range determination unit and a target PID parameter group calling unit. The state parameter range determination unit is used to determine the state parameter ranges to which the current state parameter and the target state parameter belong, and to make all state parameter ranges covered by the current state parameter to the target state parameter the target state parameter range. The target PID parameter group calling unit calls the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0115] Based on the above optimization, the control device may also include a current working mode judgment module, which is used to judge the current working mode of the chiller; a state parameter type determination module, which is used to determine the state parameters to be adjusted according to the current working mode; the state parameter acquisition module 100 can also be used to obtain the current state parameters and target state parameters of the branch pipeline matching the current working mode.

[0116] The control device of the multi-channel chiller can execute the control method of the multi-channel chiller provided by any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the control method, which will not be described in detail one by one in this embodiment.

[0117] Embodiment 7

[0118] Embodiment 7 of the present invention provides a multi-channel chiller system, which includes: one or more processors and a storage device; the processor in the system may be one or more; the storage device is used to store one or more programs; the one or more programs are executed by one or more processors, so that the one or more processors implement a control method for a multi-channel chiller as in any one of the embodiments of the present invention.

[0119] The storage device in the system is a computer-readable storage medium that can be used to store one or more programs, which can be software programs, computer executable programs, and modules, such as program instructions / modules corresponding to the control method of the multi-channel chiller provided in Embodiment 1 or 2 of the present invention. The processor executes various functional applications and data processing of the system by running the software programs, instructions, and modules stored in the storage device, that is, implementing the control method of the multi-channel chiller in the above method embodiment.

[0120] The storage device may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the system, etc. In addition, the storage device may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the storage device may further include a memory remotely arranged relative to the processor, and these remote memories may be connected to the system via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0121] Embodiment 8

[0122] Embodiment 8 of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the program is used to execute the control method of the multi-channel chiller provided by any embodiment of the present invention.

[0123] The computer storage medium of the embodiment of the present invention may adopt any combination of one or more computer-readable media. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples (non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a flash memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the above. The computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, device or device.

[0124] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to: electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0125] The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, radio frequency (RF), etc., or any suitable combination of the above.

[0126] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0127] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control method for a multi-channel chiller, the multi-channel chiller comprising: A water chiller housing, a main pipeline, and a plurality of branch pipelines, wherein the water chiller housing stores cooling liquid and a temperature regulating device, the plurality of branch pipelines are arranged in parallel and are respectively connected to the main pipeline, the cooling liquid flows out from the liquid outlet of the water chiller housing, passes through the first parallel node of the main pipeline and enters each branch pipeline, each branch pipeline is provided with a device to be temperature regulated, the cooling liquid flowing through each branch pipeline performs heat exchange with the device to be temperature regulated and then flows back to the water chiller housing through the return liquid outlet of the water chiller housing, characterized in that it comprises: Acquire current state parameters and target state parameters of the branch pipeline; the state parameters of the branch pipeline include at least temperature parameters, flow parameters and pressure parameters; The current control mode is determined according to the relative size relationship between the current state parameter and the target state parameter; wherein the branch pipeline has multiple control modes, and multiple groups of preset PID parameter groups are preset in each of the control modes, and at least two of the preset PID parameter groups preset in the control modes have different adjustment amplitudes for the state parameters; Selecting at least one target PID parameter group from the preset PID parameter group under the current control mode, and regulating the current state parameter according to at least one target PID parameter group until the current state parameter is equal to the target state parameter; In each of the control modes, a plurality of state parameter ranges are preset, and the state parameter ranges correspond one-to-one to the preset PID parameter groups; Selecting at least one target PID parameter group from the plurality of preset PID parameter groups under the current control mode includes: Determine the state parameter ranges to which the current state parameter and the target state parameter belong respectively; let all the state parameter ranges covered from the current state parameter to the target state parameter be the target state parameter range; Calling the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group; Under the same control mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach is divided into multiple state parameter ranges in order of numerical value, each state parameter range includes multiple state parameters, and the state parameter range has a one-to-one correspondence with the preset PID parameter group.

2. The control method according to claim 1, characterized in that: The branch pipeline has an ascending control mode, a descending control mode or a constant control mode; in the ascending control mode, multiple groups of first preset PID parameter groups are preset, in the descending control mode, multiple groups of second preset PID parameter groups are preset, and in the constant control mode, multiple groups of third preset PID parameter groups are preset, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the first preset PID parameter group, and the adjustment range of the state parameter by the third preset PID parameter group is smaller than the adjustment range of the state parameter by the second preset PID parameter group; Determining the current control mode according to the relative magnitude relationship between the current state parameter and the target state parameter includes: When the current state parameter is less than the target state parameter, and the difference between the target state parameter and the current state parameter is greater than a first preset difference, determining that the branch pipeline is in the ascending control mode; When the current state parameter is greater than the target state parameter, and the difference between the current state parameter and the target state parameter is greater than the first preset difference, determining that the branch pipeline is in the decreasing control mode; When the difference between the current state parameter and the target state parameter is less than or equal to the first preset difference, determining that the branch pipeline is in the constant control mode; Selecting at least one set of target PID parameters from the preset PID parameter group in the current control mode, and regulating the current state parameters according to at least one set of the target PID parameter group until the current state parameters are equal to the target state parameters, including: When the current control mode is the ascending control mode, selecting at least one first target PID parameter group from the plurality of first preset PID parameter groups, and regulating the current state parameter according to the at least one first target PID parameter group until the current state parameter is equal to the target state parameter; When the current control mode is the descending control mode, selecting at least one second target PID parameter group from the plurality of second preset PID parameter groups, and regulating the current state parameter according to the at least one second target PID parameter group until the current state parameter is equal to the target state parameter; When the current control mode is the constant control mode, at least one third target PID parameter group is selected from the multiple third preset PID parameter groups, and the current state parameter is regulated according to at least one third target PID parameter group until the current state parameter is equal to the target state parameter.

3. The control method according to claim 1, characterized in that: Before obtaining the current state parameter and the target state parameter of the branch pipeline, the method further includes: Determine the current working mode of the chiller, where the types of state parameters regulated in different working modes are different; Determining the state parameter to be adjusted according to the current working mode; Obtaining the current state parameters and target state parameters of the branch pipeline includes: The current state parameter and the target state parameter of the branch pipeline matching the current working mode are obtained.

4. The control method according to claim 3, characterized in that: The working mode includes a flow control mode and a pressure control mode. In the flow control mode, the flow parameter of the branch pipeline is regulated, and in the pressure control mode, the pressure parameter of the branch pipeline is regulated. The multiple control modes include multiple flow control modes and multiple pressure control modes; multiple groups of preset flow PID parameter groups are preset in the flow control mode, and multiple groups of preset pressure PID parameter groups are preset in the pressure control mode; Acquiring the current state parameter and the target state parameter of the branch pipeline matching the current working mode includes: When the current working mode is the flow control mode, the current flow parameter and the target flow parameter of the branch pipeline are obtained; when the current working mode is the pressure control mode, the current pressure parameter and the target pressure parameter of the branch pipeline are obtained; Determining the current control mode according to the relative magnitude relationship between the current state parameter and the target state parameter includes: When the current working mode is the flow control mode, the current flow control mode in the flow control mode is determined according to the current flow parameter and the target flow parameter; when the current working mode is the pressure control mode, the current pressure control mode in the pressure control mode is determined according to the current pressure parameter and the target pressure parameter; Selecting at least one set of target PID parameters from the preset PID parameter group in the current control mode, and regulating the current state parameters according to at least one set of the target PID parameter group until the current state parameters are equal to the target state parameters, including: When the current working mode is the flow control mode, selecting at least one target flow PID parameter group from the multiple preset flow PID parameter groups in the current flow control mode, and regulating the current flow parameter according to at least one target flow PID parameter group until the current flow parameter reaches the target flow parameter; When the current working mode is the pressure control mode, at least one group of target pressure PID parameter groups is selected from the multiple groups of preset pressure PID parameter groups in the current pressure control mode, and the current pressure parameter is regulated according to the target pressure PID parameter group until the current pressure parameter reaches the target pressure parameter.

5. The control method according to claim 1, characterized in that: Regulating the current state parameter according to at least one set of the target PID parameter groups until the current state parameter is equal to the target state parameter, comprising: The opening of the electronic control valve in the branch pipeline is regulated according to at least one set of the target PID parameter groups until the current state parameter is equal to the target state parameter.

6. The control method according to claim 1, characterized in that: Also includes: The coolant flowing through each branch pipe is heat exchanged with the temperature-adjusted equipment and then converges at the second parallel node. A bypass pipe is also connected between the first parallel node and the second parallel node, and the bypass pipe is arranged in parallel with each branch pipe. Get the current pressure value and target pressure value range of the main pipeline; Determine a main pipeline target PID parameter group required for the main pipeline according to the current pressure value and the target pressure value range; The opening of the bypass valve in the bypass pipeline is regulated according to the main pipeline target PID parameter group until the current pressure value reaches the target pressure value range.

7. A control device for a multi-channel chiller, the multi-channel chiller comprising: A water chiller housing, a main pipeline, and a plurality of branch pipelines, wherein the water chiller housing stores cooling liquid and a temperature regulating device, the plurality of branch pipelines are arranged in parallel and are respectively connected to the main pipeline, the cooling liquid flows out from the liquid outlet of the water chiller housing, passes through the first parallel node of the main pipeline and enters each branch pipeline, each branch pipeline is provided with a device to be temperature regulated, the cooling liquid flowing through each branch pipeline performs heat exchange with the device to be temperature regulated and then flows back to the water chiller housing through the return liquid outlet of the water chiller housing, characterized in that it comprises: A state parameter acquisition module, used to acquire current state parameters and target state parameters of the branch pipeline; the state parameters of the branch pipeline include flow parameters and pressure parameters; A current control mode determination module is used to determine the current control mode according to the relative size relationship between the current state parameter and the target state parameter; wherein the branch pipeline has multiple control modes, each of the control modes has multiple groups of preset PID parameter groups preset, and the preset PID parameter groups preset in different control modes are different; a state parameter adjustment module, configured to select at least one target PID parameter group from the preset PID parameter group under the current control mode, and adjust the current state parameter according to at least one target PID parameter group until the current state parameter is equal to the target state parameter; In each of the control modes, a plurality of state parameter ranges are preset, and the state parameter ranges correspond one-to-one to the preset PID parameter groups; The state parameter adjustment module includes a state parameter range determination unit and a target PID parameter group calling unit; The state parameter range determination unit is used to determine the state parameter ranges to which the current state parameter and the target state parameter belong, and to define all state parameter ranges covered from the current state parameter to the target state parameter as the target state parameter range; The target PID parameter group calling unit calls the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group; Among them, under the same control mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach is divided into multiple state parameter ranges in order of numerical value, each state parameter range includes multiple state parameters, and the state parameter range has a one-to-one correspondence with the preset PID parameter group.

8. A multi-channel chiller system, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the control method of the multi-channel chiller as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the control method of the multi-channel chiller as described in any one of claims 1 to 6 is implemented.

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