Control method, device and system of multi-channel cooling-water machine and storage medium

Abstract

The invention discloses a control method, device and system of a multi-channel cooling-water machine and a storage medium. The control method comprises the steps of obtaining a current state parameter and a target state parameter of a branch pipeline; determining a current regulation and control mode according to a relative size relationship between the current state parameter and the target state parameter; determining a state parameter range to which the current state parameter and the target state parameter belong; all state parameter ranges covered by the current state parameter to the target state parameter are set as a target state parameter range; calling a preset PID parameter group corresponding to the target state parameter range as a target PID parameter group; and regulating and controlling 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. In the working process of the cooling-water machine, the regulation and control precision of the state parameters of all the pipelines of the cooling-water machine can be improved, and the application range of the multi-channel cooling-water machine is widened.

Description

[0001] This application is a divisional application of the application with the application date of May 17, 2023, application number 202310555824.4, and patent name "Control Method, Device, System and Storage Medium of a Multi-channel Chiller". Technical Field

[0002] Embodiments of the present invention relate to the technical field of chillers, and in particular, to a control method, device, system and storage medium of a multi-channel chiller. Background Art

[0003] 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 devices or different areas of a device. During the application of a multi-channel chiller, it is necessary to adjust the state parameters in each branch pipeline 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 a multi-channel chiller is poor, and it is difficult to meet the requirements of some solutions with high accuracy requirements for state parameters. Summary of the Invention

[0004] The present invention provides a control method, device, system and storage medium of a multi-channel chiller to improve the accuracy of regulating the state parameters of each pipeline of the chiller and expand the application range of the multi-channel chiller.

[0005] According to an aspect of the present invention, there is provided a control method of a multi-channel chiller, where the multi-channel chiller includes: a chiller box body, a main pipeline, and multiple branch pipelines. Among them, a coolant and a temperature control device are stored in the chiller box body. The multiple branch pipelines are arranged in parallel and are respectively connected to the main pipeline. The coolant flows out from the liquid outlet of the chiller box body, enters each branch pipeline through the first parallel node of the main pipeline, and there are devices to be temperature-controlled in each branch pipeline. After the coolant flowing through each branch pipeline exchanges heat with the device to be temperature-controlled, it flows back to the chiller box body through the liquid return port of the chiller box body. The control method of the multi-channel chiller includes:

[0006] Obtain the current state parameters and target state parameters of the branch pipeline;

[0007] Determine the current regulation mode according to the relative magnitude relationship between the current state parameters and the target state parameters; where, under the same regulation mode, the minimum state parameter that the branch pipeline can reach to the maximum state parameter are divided into multiple state parameter ranges in numerical order, and each state parameter range includes multiple state parameters. The state parameter range has a one-to-one correspondence with a preset PID parameter group;

[0008] Determine the state parameter ranges to which the current state parameter and the target state parameter belong; let all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range;

[0009] Call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group;

[0010] Regulate the current state parameter according to at least one group of the target PID parameter groups until the current state parameter is equal to the target state parameter.

[0011] According to another aspect of the present invention, there is provided a control device for a multi-channel chiller. The multi-channel chiller includes: a chiller cabinet, a main pipeline, and a plurality of branch pipelines. Among them, the chiller cabinet stores a coolant and a temperature adjustment device. The plurality of branch pipelines are arranged in parallel and are respectively communicated with the main pipeline. The coolant flows out from the liquid outlet of the chiller cabinet, enters each branch pipeline through the first parallel node of the main pipeline. Each branch pipeline is provided with a device to be temperature-adjusted. After the coolant flowing through each branch pipeline exchanges heat with the device to be temperature-adjusted, it flows back to the chiller cabinet through the liquid return port of the chiller cabinet. The control device for the multi-channel chiller includes:

[0012] A state parameter acquisition module, configured to acquire the current state parameter and the target state parameter of the branch pipeline;

[0013] A current regulation mode determination module, configured to determine the current regulation mode according to the relative magnitude relationship between the current state parameter and the target state parameter; wherein, under the same regulation mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach are divided into a plurality of state parameter ranges in numerical order, and each state parameter range includes a plurality of state parameters. The state parameter range and the preset PID parameter group are in a one-to-one correspondence relationship;

[0014] A state parameter adjustment module, configured to regulate the current state parameter according to at least one group of the target PD parameter groups until the current state parameter is equal to the target state parameter;

[0015] The state parameter adjustment module includes: a state parameter range determination unit and a target PID parameter group call unit;

[0016] The state parameter range determination unit is configured to determine the state parameter ranges to which the current state parameter and the target state parameter belong; let all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range;

[0017] The target PID parameter group calling unit is configured to call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0018] According to another aspect of the present invention, there is also provided a multi-channel chiller system, which includes:

[0019] One or more processors;

[0020] A storage device for storing one or more programs;

[0021] 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 embodiment of the present invention.

[0022] According to another aspect of the present invention, there is also provided a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the control method of the multi-channel chiller as described in any embodiment of the present invention.

[0023] The technical solution of the embodiment of the present invention includes obtaining the current state parameter and the target state parameter of the branch pipeline; determining the current regulation mode according to the relative magnitude relationship between the current state parameter and the target state parameter; wherein, under the same regulation mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach are divided into multiple state parameter ranges in numerical order, each state parameter range includes multiple state parameters, and there is a one-to-one correspondence between the state parameter range and the preset PID parameter group; determining the state parameter ranges to which the current state parameter and the target state parameter belong; making all the state parameter ranges covered by 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; regulating the current state parameter according to at least one group of target PID parameter groups until the current state parameter is equal to the target state parameter. By 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 parameter can quickly and accurately reach the target state parameter, thereby improving the regulation accuracy of the state parameters of each pipeline of the chiller and expanding the application range of the multi-channel chiller. In summary, the present invention solves the problem in the prior art that the adjustment accuracy of the state parameters corresponding to each pipeline of the multi-channel chiller is poor and it is difficult to meet the requirements of some solutions with high precision requirements for state parameters.

[0024] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a schematic flowchart of a control method for a multi-channel chiller according to Embodiment 1 of the present invention;

[0027] Figure 2 is a schematic structural diagram of a multi-channel chiller according to an embodiment of the present invention;

[0028] Figure 3 is a schematic control logic diagram of a control method for a multi-channel chiller according to Embodiment 2 of the present invention;

[0029] Figure 4 is a schematic flowchart of a control method for a multi-channel chiller according to Embodiment 3 of the present invention;

[0030] Figure 5 is a schematic diagram of a regulation mode interface according to an embodiment of the present invention;

[0031] Figure 6 is a schematic flowchart of a control method for a multi-channel chiller according to Embodiment 4 of the present invention;

[0032] Figure 7 is a schematic structural diagram of a control device for a multi-channel chiller according to Embodiment 6 of the present invention. Detailed Embodiments

[0033] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. Additionally, it should be noted that for the convenience of description, only the parts related to the present invention are shown in the drawings rather than all the structures.

[0034] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts depict the operations (or steps) as sequential processes, many of the operations can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operations are completed, but it can also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc. In addition, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0035] The term "comprising" and its variations used in the present invention are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "an embodiment" means "at least one embodiment".

[0036] 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 the interdependent relationship.

[0037] It should be noted that the modification of "one" and "multiple" mentioned in the present invention is illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly specified in the context, it should be understood as "one or more".

[0038] Embodiment 1

[0039] Figure 1 is a schematic flow chart of a control method for a multi-channel chiller according to Embodiment 1 of the present invention. Refer to Figure 1 , this method is applicable to adjusting the state parameters of a multi-channel chiller. This method can be executed by the control device of the multi-channel chiller provided by the embodiments of the present invention, where 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 thereto; the control device can be stored or integrated in the multi-channel chiller system.

[0040] Figure 2 is a schematic structural diagram of a multi-channel chiller according to an embodiment of the present invention. Refer to Figure 2 , the multi-channel chiller (hereinafter also referred to as "chiller" for short) includes a chiller box body 1, a main pipeline 2, and multiple branch pipelines 3. Among them, the chiller box body 1 stores coolant and a temperature adjustment device 4. The multiple branch pipelines 3 are arranged in parallel and are respectively communicated with the main pipeline 2. The coolant flows out from the liquid outlet 10 of the chiller box body 1 ( Figure 2The direction of the arrow in the figure indicates the flow direction of the coolant. It 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 5 to be temperature-adjusted. The device 5 to be temperature-adjusted can be a motor, a battery, a manufacturing device, etc., but is not limited thereto. The coolant flowing through each branch pipe 3 exchanges heat with the device 5 to be temperature-adjusted and then converges at the second parallel node b, and then flows back into the chiller housing 1 through the liquid return 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.

[0041] As Figure 1 shown, a control method for a multi-channel chiller provided in Embodiment 1 of the present invention includes the following steps:

[0042] S110. Obtain the current state parameters and target state parameters of the branch pipe.

[0043] Among them, the state parameters of the branch pipe at least include temperature parameters, flow parameters, and pressure parameters. The current state parameters of the branch pipe can be obtained based on the sensors arranged in each branch pipe. As Figure 2 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.

[0044] It should be noted that the current state parameters and the target state parameters should be of the same type of state parameters. Exemplarily, 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.

[0045] When the user uses the chiller for cooling, the user can input each target state parameter on the control interface of the chiller, such as inputting the target temperature parameter, the target flow parameter, and the target pressure parameter. The target state parameter is the state parameter when the chiller reaches a stable working state.

[0046] It can be understood that during the process of the chiller starting from startup to reaching a stable working state, the 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 sensors in the branch pipe, and at the same time, the target state parameters input by the user are obtained.

[0047] S120. Determine the current regulation mode according to the relative magnitude relationship between the current state parameters and the target state parameters.

[0048] Among them, the branch pipeline has multiple regulation modes, and multiple groups of preset PID parameter groups are preset under each regulation mode. There are at least two regulation modes in which the adjustment ranges of the PID parameter groups for the state parameters are different. The regulation mode refers to the regulation 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 standard state parameter is large, the current state parameter can be adjusted to the target state parameter with a large amplitude to improve the regulation rate. At this time, the branch pipeline can correspond to one regulation 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 with a small amplitude to avoid excessive adjustment of the state parameter. At this time, the branch pipeline can correspond to another regulation mode. Of course, in the actual application process, the division method of the adjustment mode is not limited to this, and those skilled in the art can divide different regulation modes according to actual needs.

[0049] Multiple regulation modes can be divided in the research and development design stage of the chiller control device, and each regulation mode corresponds to at least one set (two) of state parameters. In the actual application process, a regulation mode corresponding to a set of state parameters with the same relative magnitude relationship as the current state parameter and the target state parameter can be determined, and this regulation mode is the current regulation mode.

[0050] It should be noted that multiple sets of state parameters can correspond to the same regulation mode. Among them, the adjustment ranges and / or adjustment directions between the two state parameters in each set of state parameters are the same.

[0051] Furthermore, in the embodiments of the present invention, the proportional-integral-differential (PID) algorithm can be used to adjust the current state parameter. PID control compares the collected data with a reference value, and then uses this difference to calculate a new input value. The purpose of this new input value is to make the data of the system reach or maintain the reference value. Multiple groups of preset PID parameter groups can be preset under each regulation mode. The preset PID parameter group can 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 the state parameter, a lower limit value of the state parameter, and a proportional coefficient. At least one of the adjustment parameters in different preset PID parameters is different.

[0052] In addition, since different regulation modes reflect the relative relationship between the current state parameter and the target state parameter, in this embodiment, the preset PID parameter groups under different regulation modes can be set to be different, and each preset PID parameter group is used to quickly and accurately adjust the current state parameter to the target state parameter in the corresponding regulation mode.

[0053] Further, the preset PID parameter groups corresponding to the respective adjustment modes can be obtained in advance based on tests or algorithms, etc. It can be understood that, generally, during the R & D and design stage of the chiller control device, R & D personnel can set the various state parameters of the chiller branch pipeline to vary within a certain range according to user requirements. For example, for a chiller, the maximum temperature, minimum temperature, maximum pressure, minimum pressure, maximum flow rate, and minimum flow rate that can be achieved in its branch pipeline can all be designed and determined in advance. In this embodiment, under each regulation mode, the optimal PID parameter group required when various state parameters are adjusted between any two parameter values (for example, the first temperature parameter value and the second temperature parameter value) can be obtained in advance. The optimal PID parameter group is a group of preset PID parameter groups; the first temperature parameter value can be quickly and accurately adjusted to the second temperature parameter value by using the optimal PID parameter group. Since the state parameters have a certain numerical range, there should also be multiple groups of preset PID parameter groups corresponding to different state parameters. After obtaining multiple groups of preset PID parameter groups, the multiple groups of preset PID parameter groups are stored in advance.

[0054] S130. Select at least one target PID parameter group from the preset PID parameter groups in the current regulation mode, and regulate 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.

[0055] Further, at different working times of the chiller, the relative magnitudes between the current state parameter and the target state are different, that is, the current regulation mode may be different. In this embodiment, at least one target PID parameter group that matches the current state parameter and the target state parameter can be selected from the multiple groups of preset PID parameter groups corresponding to the current regulation 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.

[0056] Under this setting method, the most suitable PID parameter group can be selected according to the real-time operation state of the branch pipeline. During the entire regulation process, the state parameters of the branch pipeline may be adjusted according to multiple groups of PID parameter groups, so that the current state parameter accurately reaches the target state parameter, which greatly improves the problem of poor regulation accuracy caused by only selecting one PID parameter group during the entire regulation process in the prior art.

[0057] A control method for a multi-channel chiller provided in Embodiment 1 of the present invention first obtains the current state parameters and target state parameters of the branch pipeline; secondly, determines the current regulation mode according to the relative magnitude relationship between the current state parameters and the target state parameters. Among them, the branch pipeline has multiple regulation modes, and multiple groups of preset PID parameter groups are preset under each regulation mode. There are at least two regulation modes in which the adjustment amplitudes of the preset PID parameter groups for the state parameters are different; then at least one target PID parameter group is selected from the preset PID parameter groups in the current regulation mode, and the current state parameters are regulated according to at least one target PID parameter group 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 regulating the state parameters of each pipeline of the chiller and expanding the application range of the multi-channel chiller.

[0058] On the basis of the above embodiment, a variant embodiment of the above embodiment is proposed. Here, it should be noted that for the sake of brevity of description, only the differences from the above embodiment are described in the variant embodiment.

[0059] Embodiment 2

[0060] In this embodiment, the branch pipeline has an ascending regulation mode, a descending regulation mode, or a constant regulation mode; in the ascending regulation mode, multiple groups of first preset PID parameter groups are preset, in the descending regulation mode, multiple groups of second preset PID parameter groups are preset, and in the constant regulation mode, multiple groups of third preset PID parameter groups are preset. The adjustment range of the third preset PID parameter group for the state parameter is smaller than the adjustment range of the first preset PID parameter group for the state parameter, and the adjustment range of the third preset PID parameter group for the state parameter is smaller than the adjustment range of the second preset PID parameter group for the state parameter. The above S120, determining the current regulation mode according to the relative magnitude relationship between the current state parameter and the target state parameter, can be further refined as follows: 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 the first preset difference, it is determined that the branch pipeline is in the ascending regulation 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 regulation 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 regulation mode. The above S130, selecting at least one group of target PID parameters from the preset PID parameter groups in the current regulation mode and regulating the current state parameter according to at least one group of target PID parameter groups until the current state parameter is equal to the target state parameter, can be further refined as follows: when the current regulation mode is the ascending regulation mode, selecting at least one group of first target PID parameter groups from multiple groups of first preset PID parameter groups and regulating the current state parameter according to at least one group of first target PID parameter groups until the current state parameter is equal to the target state parameter; when the current regulation mode is the descending regulation mode, selecting at least one group of second target PID parameter groups from multiple groups of second preset PID parameter groups and regulating the current state parameter according to at least one group of second target PID parameter groups until the current state parameter is equal to the target state parameter; when the current regulation mode is the constant regulation mode, selecting at least one group of third target PID parameter groups from multiple groups of third preset PID parameter groups and regulating the current state parameter according to at least one group of third target PID parameter groups until the current state parameter is equal to the target state parameter.

[0061] Among them, in the ascending regulation mode, the target state parameter is larger and the current state parameter is smaller, and it is necessary to control the current state parameter to increase by a large margin; in the descending regulation mode, the target state parameter is smaller and the current state parameter is larger, and it is necessary to control the current state parameter to decrease by a large margin; in the constant regulation mode, the current state parameter and the target state parameter are close, and it is necessary to control the current state parameter to decrease (or increase) by a small margin.

[0062] Therefore, the adjustment ranges of the preset first preset PID parameter group in the up-regulation mode and the preset second preset PID parameter group in the down-regulation mode for the state parameters are both large, and the adjustment directions of the two for the state parameters are opposite; the adjustment range of the preset third preset PID parameter group in the constant-regulation mode for the state parameters is relatively small.

[0063] Figure 3 is a control logic schematic diagram of a control method for a multi-channel chiller provided in Embodiment 2 of the present invention. As Figure 3 shown, a control method for a multi-channel chiller provided in Embodiment 2 of the present invention includes the following steps: First, obtain the current state parameter and the target state parameter of the branch pipeline. This step is the same as that in the above embodiment and will not be elaborated 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 up-regulation mode; in the up-regulation mode, select at least one group of first target state PID parameter groups that match the current state parameter and the target state parameter from the first preset PID parameter group, and adjust the current state parameter 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 down-regulation mode; in the down-regulation mode, select at least one group of second target state PID parameter groups that match the current state parameter and the target state parameter from the second preset PID parameter group, and adjust the current state parameter according to the second target state PID parameter group. If the difference between the current state parameter and the target state parameter is relatively small, 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-regulation mode; in the constant-regulation mode, select at least one group of third target state PID parameter groups that match the current state parameter and the target state parameter from the third preset PID parameter group, and adjust the current state parameter according to the third target state PID parameter group. Further, determine whether the current state parameter is equal to the target state parameter. If so, work stably at the target state parameter. If not, continue to execute the above control process.

[0064] Among them, the size of the first preset difference is not limited in the embodiments of the present invention, and those skilled in the art can set it according to actual needs. As can be seen from the above, the state parameters of the branch pipeline include temperature parameters, flow parameters, pressure parameters, etc. For different types of state parameters, the first preset difference is also different. Exemplarily, if the temperature parameter is to be adjusted, the first preset difference should be a temperature value, such as 0.1 to 2 °C, but not limited thereto; if the flow parameter is to be adjusted, the first preset difference should be a flow value, such as 0.1 L / min to 2 L / min, but not limited thereto; if the pressure parameter is to be adjusted, the first preset difference should be a pressure value, such as 10 to 50 KPa, but not limited thereto.

[0065] Exemplarily, 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 down-regulation control mode. At this time, the target PID parameter group matching 40 to 20 °C can be selected from the down-regulation 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 changes 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 parameter and the pressure parameter are similar to the above process and will not be described in detail.

[0066] It can be understood that when the chiller is started, the initial state parameters of each branch pipeline generally differ greatly from the target state parameters. By adopting the technical solution in this embodiment, at least two control modes will be passed from the initial state parameter adjustment to the target state parameter, that is, at least two groups of target PID parameter groups will be used for adjustment.

[0067] In the technical solution of the second embodiment of the present invention, by dividing the up-regulation control mode, the down-regulation control mode and the constant control mode, and presetting the PID parameter groups corresponding to each control mode; suitable target PID parameter groups can be matched for each state parameter starting from the initial state parameter. The existence of the constant control mode and the corresponding third preset PID parameter group can further ensure the precise control of the state parameter and avoid the problems of insufficient adjustment or excessive adjustment.

[0068] Embodiment 3

[0069] In this embodiment, multiple state parameter ranges are also preset for each control mode, and the state parameter ranges correspond one-to-one with the preset PID parameter groups. Based on this, "select at least one target PID parameter group from multiple groups of preset PID parameter groups in the current control mode" in S130 in the first embodiment above can be further refined as follows: S231. Determine the state parameter ranges to which the current state parameter and the target state parameter belong, and make all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range; S232. Call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0070] Figure 4 FIG. is a schematic flowchart of a control method for a multi-channel chiller provided in Embodiment 3 of the present invention, and reference may be made to Figure 4 , in this embodiment, the control method includes:

[0071] S210. Obtain the current state parameter and the target state parameter of the branch pipeline.

[0072] S220. Determine the current control mode according to the relative magnitude relationship between the current state parameter and the target state parameter.

[0073] Among them, in the same control mode, the minimum state parameter that the branch pipeline can reach to the maximum state parameter can be divided into multiple state parameter ranges in numerical order, and each state parameter range includes multiple state parameters. The state parameter range and the preset PID parameter group are in a one-to-one correspondence relationship. In the same control mode, the number of the state parameter range and the preset PID parameter group is not limited and can be set according to actual needs. Exemplarily, Figure 5 FIG. is an interface diagram of a control mode provided in an embodiment of the present invention. As Figure 5 shown, in the up-regulation control mode, four first state parameter ranges (labeled ① to ④ respectively) can be set, and four first preset PID parameter groups (labeled 1 to 4 respectively) corresponding to the four first state parameter ranges; in the down-regulation control mode, four second state parameter ranges (labeled ⑤ to ⑧ respectively) can be set, and four second preset PID parameter groups (labeled 5 to 8 respectively) corresponding to the four second state parameter ranges; in the constant-regulation control mode, four third state parameter ranges (labeled ⑨ to ) can be set, and four third preset PID parameter groups (labeled 9 to 12 respectively) corresponding to the four third state parameter ranges. The actual setting method is not limited to this.

[0074] Still taking the temperature parameter as an example, if the minimum value of the temperature parameter can reach -20°C and the maximum value can reach 120°C, then in the ascending control mode, the four first temperature parameter ranges are -20 to 10°C, 10°C to 40°C, 40 to 80°C, and 80 to 120°C respectively. The boundary temperature parameter values of two adjacent first preset temperature PID parameter groups in the same control mode are 10°C, 40°C, and 80°C respectively. The division methods of the temperature parameter ranges in the descending control mode and the constant control mode are the same as those in the ascending control mode, but for the same temperature parameter range, the corresponding preset temperature PID parameter groups in the descending control mode (or the constant control mode) are different from those in the ascending control mode.

[0075] For the flow rate parameter, if the minimum value of the flow rate parameter can be 5 L / min and the maximum value can reach 40 L / min, then in the ascending control mode, the four first flow rate parameter ranges are 0 to 5 L / min, 5 to 15 L / min, 15 to 25 L / min, and 25 to 40 L / min respectively. The boundary flow rate parameter values of two adjacent first preset flow rate PID parameter groups in the same control mode are 5 L / min, 15 L / min, and 25 L / min respectively. The division methods of the flow rate parameter ranges in the descending control mode and the constant control mode are the same as those in the ascending control mode, but for the same flow rate parameter range, the corresponding preset flow rate PID parameter groups in the descending control mode (or the constant control mode) are different from those in the ascending control mode.

[0076] For the pressure parameter, if the minimum value of the pressure parameter can be 0 KPa and the maximum value can reach 500 KPa, then in the ascending control mode, the four first pressure parameter ranges are 0 to 100 KPa, 100 to 200 KPa, 200 to 300 KPa, and 300 to 500 KPa respectively. The boundary pressure parameter values of two adjacent first preset pressure PID parameter groups in the same control mode are 100 KPa, 200 KPa, and 300 KPa respectively. The division methods of the pressure parameter ranges in the descending control mode and the constant control mode are the same as those in the ascending control mode, but for the same pressure parameter range, the corresponding preset pressure PID parameter groups in the descending control mode (or the constant control mode) are different from those in the ascending control mode.

[0077] S231. Determine the state parameter ranges to which the current state parameter and the target state parameter belong, and let all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range.

[0078] Further, determine in which state parameter range the current state parameter and the target state parameter are respectively located under the current regulation mode. If the current state parameter and the target state parameter are in the same state parameter range (for example, the first state parameter range ②), then define the first state parameter range ② as the target state parameter range; if the current state parameter range and the target state parameter range are in different state parameter ranges (for example, the current state parameter is in the first state parameter range ② and the target state parameter is in the first state parameter range ④), then define the first state parameter range ② to the first state parameter range ④ as the target state parameter range.

[0079] S232. Call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0080] Further, select the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group. Exemplarily, if the target state parameter range is the first state parameter range ②, then call the first target PID parameter group 2; if the target state parameter range is the first state parameter range ② to the first state parameter range ④, then call the first target PID parameter group 2 to the first target PID parameter group 4 as the target PID parameter group.

[0081] S233. Regulate the current state parameter according to at least one group of target PID parameter groups until the current state parameter is equal to the target state parameter.

[0082] Correspondingly, when there is one group of target PID parameter groups, then adjust according to this group of target PID parameter groups; when there are multiple groups of target PID parameter groups, adjust the current state parameter in the order of arrangement of the target PID parameter groups. Exemplarily, if the target PID parameter group is the first target PID parameter group 2, then adjust the current state parameter 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, then adjust the current state parameter according to the first target PID parameter group 2 to the first target PID parameter group 4 in turn. If the regulation mode changes, then call the target PID parameter group under the changed regulation mode in the above manner and continue to adjust the current state parameter until the current state parameter reaches the target state parameter.

[0083] Embodiment 4

[0084] Figure 6It is a schematic flowchart of a control method for a multi-channel chiller provided in Embodiment 4 of the present invention. In this embodiment, before performing S110 in Embodiment 1 above, that is, 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. Different types of state parameters are regulated under different working modes; S301, determining the state parameters to be regulated according to the current working mode. S110 in Embodiment 1 above, that is, obtaining the current state parameters and target state parameters of the branch pipeline, may be further refined as: S311, obtaining the current state parameters and target state parameters of the branch pipeline that match the current working mode.

[0085] As Figure 6 shown, the control method of this embodiment includes:

[0086] S300, determining the current working mode of the chiller.

[0087] Among them, according to actual requirements, the chiller includes different working modes, such as a pressure control mode and a flow control mode. It can be understood that under different working modes of the chiller, different types of state parameters need to be adjusted. For example, the pressure control mode means that during the process of the chiller reaching the target temperature parameter, the pressure in the branch pipeline is mainly controlled to remain at the target pressure parameter; the flow control mode means that during the process of the chiller reaching the target temperature parameter, the flow rate of a branch pipeline is mainly controlled to remain at the target flow rate parameter. Generally, when a user uses the chiller, the required working mode will be input. In this embodiment, the current working mode set by the user can be detected and determined.

[0088] S301, determining the state parameters to be regulated according to the current working mode.

[0089] Furthermore, determine the state parameters that need to be adjusted in the current working mode.

[0090] S311, obtaining the current state parameters and target state parameters of the branch pipeline that match the current working mode.

[0091] Furthermore, if the current working mode is the flow control mode, obtain the current flow rate parameter and the target flow rate parameter; if the current working mode is the pressure control mode, obtain the current pressure parameter and the target pressure parameter.

[0092] S320, determining the current regulation mode according to the relative magnitude relationship between the current state parameter and the target state parameter.

[0093] S330, selecting at least one group of target PID parameter groups from the preset PID parameter groups in the current regulation mode, and regulating the current state parameter according to at least one group of target PID parameter groups until the current state parameter is equal to the target state parameter.

[0094] Further, in the same manner as in the above-mentioned embodiments, the current state parameters matching the current working mode are adjusted. The specific adjustment process is the same as that in the above-mentioned embodiments and will not be elaborated here.

[0095] Optionally, as a refinement of Embodiment 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 regulation modes include multiple flow regulation modes and multiple pressure regulation modes; multiple groups of preset flow PID parameter groups are preset in the flow regulation mode, and multiple groups of preset pressure PID parameter groups are preset in the pressure regulation mode; S311 in Embodiment 4 above, 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 regulation mode according to the relative magnitude 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 current flow regulation mode in the flow control mode according to the current flow parameters and the target flow parameters; when the current working mode is the pressure control mode, determining the current pressure regulation mode in the pressure control mode according to the current pressure parameters and the target pressure parameters; S330, selecting at least one group of target PID parameters from the preset PID parameter groups in the current regulation 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, can be further refined as: when the current working mode is the flow control mode, selecting at least one group of target flow PID parameters from the multiple groups of preset flow PID parameter groups in the current flow regulation mode and regulating 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, selecting at least one group of target pressure PID parameter groups from the multiple groups of preset pressure PID parameter groups in the current pressure regulation mode and regulating the current pressure parameters according to the target pressure PID parameter groups until the current pressure parameters reach the target pressure parameters.

[0096] It should be noted 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, the temperature control mode is not separately elaborated in this embodiment, and only the control methods in the flow control and pressure control modes are introduced in detail.

[0097] Further, in both the flow control mode and the pressure control mode, the branch pipeline can be in the up-regulation mode, the down-regulation mode, or the constant-regulation mode. In the flow control mode, the up-regulation mode of the branch pipeline is the up-flow regulation mode, the down-regulation mode is the down-flow regulation mode, and the constant-regulation mode is the constant-flow regulation mode; multiple groups of preset flow PID parameter sets are preset for each flow regulation mode. In the pressure control mode, the up-regulation mode of the branch pipeline is the up-pressure regulation mode, the down-regulation mode is the down-pressure regulation mode, and the constant-regulation mode is the constant-pressure regulation mode; multiple groups of preset pressure PID parameter sets are preset for each pressure regulation mode.

[0098] The division of the flow regulation mode or the pressure regulation mode can refer to the division method of the regulation mode given in Embodiment 1, and will not be elaborated here. In addition, the setting method of the preset flow PID parameter set and the preset pressure PID parameter set corresponding to the flow regulation mode or the pressure regulation mode can also refer to Embodiment 1.

[0099] Further, in the flow control mode, the current flow parameter and the target flow parameter are obtained and compared. When the relative magnitude relationship between the current flow parameter and the target flow parameter satisfies the relationship of the flow parameter in the up-regulation mode in Embodiment 2 above, it can be determined that the current flow regulation mode enters the up-flow regulation mode; when the relative magnitude relationship between the current flow parameter and the target flow parameter satisfies the relationship of the flow parameter in the down-regulation mode in Embodiment 2 above, it can be determined that the current flow regulation mode enters the down-flow regulation mode; when the relative magnitude relationship between the current flow parameter and the target flow parameter satisfies the relationship of the flow parameter in the constant-regulation mode in Embodiment 2 above, it can be determined that the current flow regulation mode enters the constant-flow regulation mode.

[0100] Correspondingly, in the pressure control mode, the current pressure parameter and the target pressure parameter are obtained and compared. When the relative magnitude relationship between the current pressure parameter and the target pressure parameter satisfies the relationship of the pressure parameter in the up-regulation mode in Embodiment 2 above, it can be determined that the current pressure regulation mode enters the up-pressure regulation mode; when the relative magnitude relationship between the current pressure parameter and the target pressure parameter satisfies the relationship of the pressure parameter in the down-regulation mode in Embodiment 2 above, it can be determined that the current pressure regulation mode enters the down-pressure regulation mode; when the relative magnitude relationship between the current pressure parameter and the target pressure parameter satisfies the relationship of the pressure parameter in the constant-regulation mode in Embodiment 2 above, it can be determined that the current pressure regulation mode enters the constant-pressure regulation mode.

[0101] Further, at least one set of target flow PID parameter groups (target pressure PID parameter groups) that match the current flow parameters (current pressure parameters) and the target flow parameters (target pressure parameters) are selected from the current flow regulation mode (current pressure regulation mode) corresponding to the flow control mode (pressure control mode). Then, the current flow parameters (current pressure parameters) are regulated according to the target flow PID parameter groups (target pressure PID parameter groups), so that the current flow parameters (current pressure parameters) can quickly and accurately reach the target flow parameters (target pressure parameters).

[0102] Optionally, in an alternative embodiment of the present invention, S130 in the above-mentioned first embodiment, regulating 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, can be further refined as: regulating the opening degree of the electronic regulating valve in the branch pipeline according to at least one set of target PID parameter groups until the current state parameters are equal to the target state parameters.

[0103] Specifically, as Figure 2 shown, an electronic regulating valve 12 is installed in each branch pipeline 3, and the electronic regulating valve 12 can be used to regulate the current state parameters. In this embodiment, the adjustment parameters of the target PID parameter group may include the opening degree of the electronic regulating valve 12, and then the current state parameters (including the current temperature parameter, the current flow parameter or the current pressure parameter) are regulated by adjusting the opening degree of the electronic regulating valve 12.

[0104] Exemplarily, if it is necessary to increase the current flow parameter or the current pressure parameter in the branch pipeline, the opening degree of the electronic regulating valve can be increased, and vice versa.

[0105] Embodiment Five

[0106] Optionally, in this embodiment, in addition to the step flow in the first embodiment, it can be further added after S130: obtaining the current pressure value and the 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; regulating the opening degree 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.

[0107] Those skilled in the art can understand that during the operation of the chiller, in addition to stabilizing parameters such as the flow rate and pressure in the branch pipeline at the target values, the pressure in the main pipeline should also be maintained within a safe pressure value range to improve the operation reliability and service life of the chiller and each component in the chiller (such as water pumps, regulating valves, and sensors), and reduce the number of chiller failures.

[0108] Among them, 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 embodiments of the present invention do not limit its specific numerical range.

[0109] For the above considerations, in this embodiment, as Figure 2 shown, the current pressure value of the main pipeline 2 can be obtained based on the pressure sensor 9 set in the main pipeline 2, and at the same time, the target pressure value range of the set main pipeline 2 is obtained.

[0110] Further, the target PID parameter group of the main pipeline can be determined according to the relative magnitude relationship between the current pressure value and at least one target pressure value in the target pressure value range. The target PID parameter group of the main pipeline is the most optimal 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.

[0111] Same as in Embodiment 1, multiple groups of optimal main pipeline PID parameter groups for adjustment between multiple different pressure values can be obtained in advance based on tests or algorithms, etc., and the multiple groups of main pipeline PID parameter groups are pre-stored. During the actual control process, the target PID parameter group of the main pipeline 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 target PID parameter group of the main pipeline.

[0112] Further, continue to refer to Figure 2 , since the bypass pipeline 6 is located between two parallel nodes of the main pipeline 2, the magnitude of the coolant flow rate in the bypass pipeline 6 is related to the pressure of the main pipeline 2. Therefore, in this embodiment, the opening degree of the bypass valve 13 in the bypass pipeline 6 can be regulated according to the target PID parameter group of the main pipeline, so that the current pressure value meets the target pressure value range, ensuring that the pressure in the main pipeline during the operation of the chiller always remains within a reasonable and safe range.

[0113] Embodiment 6

[0114] Figure 7 is a schematic structural diagram of a control device for a multi-channel chiller according to Embodiment 6 of the present invention. This device is used to execute the control method for a multi-channel chiller provided in any embodiment of the present invention. As Figure 7 shown, this device includes:

[0115] A state parameter acquisition module 100, configured 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;

[0116] The current regulation mode determination module 200 is configured to determine the current regulation mode according to the relative magnitude relationship between the current state parameter and the target state parameter; wherein, the branch pipeline has multiple regulation modes, and multiple groups of preset PID parameter groups are preset for each regulation mode, and the preset PID parameter groups are different for different regulation modes;

[0117] The state parameter adjustment module 300 is configured to select at least one group of target PID parameter groups from the preset PID parameter groups in the current regulation mode, and regulate the current state parameter according to the at least one group of target PID parameter groups until the current state parameter is equal to the target state parameter.

[0118] The control device of the multi-channel chiller provided in this embodiment can select the PID adjustment parameters matching the current state of each branch pipeline of the chiller, so that the current state parameter can quickly and accurately reach the target state parameter, thereby improving the accuracy of regulating the state parameters of each pipeline of the chiller and expanding the application range of the multi-channel chiller.

[0119] Further, in a further refined embodiment, the branch pipeline may have an ascending regulation mode, a descending regulation mode or a constant regulation mode; multiple groups of first preset PID parameter groups are preset in the ascending regulation mode, and multiple groups of second preset PID parameter groups are preset in the descending regulation mode, and multiple groups of third preset PID parameter groups are preset in the constant regulation mode. The adjustment range of the third preset PID parameter group for the state parameter is smaller than the adjustment range of the first preset PID parameter group for the state parameter, and the adjustment range of the third preset PID parameter group for the state parameter is smaller than the adjustment range of the second preset PID parameter group for the state parameter;

[0120] The current regulation mode determination module 200 may also be configured to determine that the branch pipeline is in the ascending regulation 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 the first preset difference; determine that the branch pipeline is in the descending regulation 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 the constant regulation mode when the difference between the current state parameter and the target state parameter is less than or equal to the first preset difference.

[0121] The state parameter adjustment module 300 is further configured to, when the current control mode is the up-regulation mode, select at least one group of first target PID parameter groups from multiple groups of first preset PID parameter groups, and regulate the current state parameter according to the at least one group of first target PID parameter groups until the current state parameter is equal to the target state parameter; when the current control mode is the down-regulation mode, select at least one group of second target PID parameter groups from multiple groups of second preset PID parameter groups, and regulate the current state parameter according to the at least one group of second target PID parameter groups until the current state parameter is equal to the target state parameter; when the current control mode is the constant-regulation mode, select at least one group of third target PID parameter groups from multiple groups of third preset PID parameter groups, and regulate the current state parameter according to the at least one group of third target PID parameter groups until the current state parameter is equal to the target state parameter.

[0122] On the basis of the above optimization, multiple state parameter ranges are preset for 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 invocation unit. The state parameter range determination unit is configured to determine the state parameter ranges to which the current state parameter and the target state parameter belong, and make all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range. The target PID parameter group invocation unit invokes the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

[0123] On the basis of the above optimization, the control device may further include a current working mode judgment module for judging the current working mode of the chiller; a state parameter type determination module for determining the state parameter to be regulated according to the current working mode; and the state parameter acquisition module 100 is further configured to acquire the current state parameter and the target state parameter of the branch pipeline matching the current working mode.

[0124] The control device of the above multi-channel chiller can execute the control method of the multi-channel chiller provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the control method. Details are not described in detail one by one in this embodiment.

[0125] Embodiment VII

[0126] Embodiment VII of the present invention provides a multi-channel chiller system, which includes: one or more processors and a storage device; the processors in the system can be one or more; the storage device is used to store one or more programs; the one or more programs are executed by the one or more processors, so that the one or more processors implement the control method of the multi-channel chiller in any one of the embodiments of the present invention.

[0127] The storage device in the system serves as a computer-readable storage medium and can be used to store one or more programs. The programs can be software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the control method of the multi-channel chiller provided in Embodiment 1 or 2 of the present invention. By running the software programs, instructions, and modules stored in the storage device, the processor executes various functional applications and data processing of the system, that is, implements the control method of the multi-channel chiller in the above method embodiments.

[0128] The storage device may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the system, etc. In addition, the storage device may include high-speed random access memory and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage devices. In some instances, the storage device may further include a memory remotely provided with respect to the processor, and these remote memories can be connected to the system through a network. Examples of the above network include but are not limited to the Internet, enterprise intranet, local area network, mobile communication network, and combinations thereof.

[0129] Embodiment 8

[0130] Embodiment 8 of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it is used to execute the control method of the multi-channel chiller provided in any embodiment of the present invention.

[0131] The computer storage medium of the embodiments of the present invention can adopt any combination of one or more computer-readable media. The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the computer-readable storage medium include: an electrical connection having 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 can be any tangible medium that contains or stores a program, and the program can be used by or in combination with an instruction execution system, apparatus, or device.

[0132] A computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal may take various forms, including but not limited to: electromagnetic signals, optical signals, or any suitable combination of the foregoing. The computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device.

[0133] The program code contained on the computer-readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical fiber cable, radio frequency (RF), etc., or any suitable combination of the foregoing.

[0134] The computer program code for performing the operations of the present invention may be written in one or more programming languages or combinations thereof. The programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone 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., by connecting through the Internet using an Internet service provider).

[0135] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A control method for a multi-channel chiller, the multi-channel chiller comprises: a chiller box body, a main pipeline, and multiple branch pipelines. Among them, the chiller box body stores a coolant and a temperature regulating device. The multiple branch pipelines are arranged in parallel and are respectively connected to the main pipeline. The coolant flows out from the liquid outlet of the chiller box body, enters each branch pipeline through the first parallel node of the main pipeline, and temperature regulating devices to be adjusted are arranged in each branch pipeline. The coolant flowing through each branch pipeline exchanges heat with the temperature regulating device to be adjusted and then flows back to the chiller box body through the liquid return port of the chiller box body. It is characterized in that it includes: Obtaining the current state parameters and target state parameters of the branch pipeline; Determining the current regulation mode according to the relative magnitude relationship between the current state parameters and the target state parameters; wherein, under the same regulation mode, the minimum state parameter that the branch pipeline can reach to the maximum state parameter are divided into multiple state parameter ranges in numerical order, and each state parameter range includes multiple state parameters. The state parameter range and the preset PID parameter group are in a one-to-one correspondence relationship; Determining the state parameter ranges to which the current state parameters and the target state parameters belong; making all the state parameter ranges covered by the current state parameters to the target state parameters be the target state parameter range; Invoking the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group; Regulating the current state parameters according to at least one group of the target PID parameter groups until the current state parameters are equal to the target state parameters.

2. The control method according to claim 1, characterized in that, The state parameters of the branch pipeline at least include: temperature parameters, flow parameters, and pressure parameters.

3. The control method according to claim 1, characterized in that, The branch pipeline has an ascending regulation mode, a descending regulation mode, or a constant regulation mode; multiple groups of first preset PID parameter groups are preset under the ascending regulation mode, multiple groups of second preset PID parameter groups are preset under the descending regulation mode, and multiple groups of third preset PID parameter groups are preset under the constant regulation mode. The adjustment amplitude of the third preset PID parameter group for the state parameters is less than the adjustment amplitude of the first preset PID parameter group for the state parameters, and the adjustment amplitude of the third preset PID parameter group for the state parameters is less than the adjustment amplitude of the second preset PID parameter group for the state parameters; The determining the current regulation mode according to the relative magnitude relationship between the current state parameters and the target state parameters 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 the first preset difference, it is determined that the branch pipeline is in the ascending regulation 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 regulation 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 regulation mode; The regulating the current state parameter according to at least one group of the target PID parameter groups until the current state parameter is equal to the target state parameter includes: When the current regulation mode is the ascending regulation mode, select at least one first target PID parameter group from multiple groups of the first preset PID parameter groups, and regulate the current state parameter according to at least one group of the first target PID parameter groups until the current state parameter is equal to the target state parameter; When the current regulation mode is the descending regulation mode, select at least one second target PID parameter group from multiple groups of the second preset PID parameter groups, and regulate the current state parameter according to at least one group of the second target PID parameter groups until the current state parameter is equal to the target state parameter; When the current regulation mode is the constant regulation mode, select at least one third target PID parameter group from multiple groups of the third preset PID parameter groups, and regulate the current state parameter according to at least one group of the third target PID parameter groups until the current state parameter is equal to the target state parameter.

4. 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, further includes: judging the current working mode of the chiller, and different types of state parameters are regulated under different working modes; determining the state parameter to be regulated according to the current working mode; the obtaining the current state parameter and the target state parameter of the branch pipeline includes: obtaining the current state parameter and the target state parameter of the branch pipeline that match the current working mode.

5. The control method according to claim 4, characterized in that, the working mode includes a flow control mode and a pressure control mode, the flow parameter of the branch pipeline is regulated in the flow control mode, and the pressure parameter of the branch pipeline is regulated in the pressure control mode; multiple regulation modes include multiple flow regulation modes and multiple pressure regulation modes; multiple groups of preset flow PID parameter groups are preset in the flow regulation mode, and multiple groups of preset pressure PID parameter groups are preset in the pressure regulation mode; the obtaining the current state parameter and the target state parameter of the branch pipeline that match the current working mode includes: when the current working mode is the flow control mode, obtaining the current flow parameter and the target flow parameter of the branch pipeline; when the current working mode is the pressure control mode, obtaining the current pressure parameter and the target pressure parameter of the branch pipeline; the determining the current regulation 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, determining the current flow regulation mode in the flow control mode according to the current flow parameter and the target flow parameter; When the current working mode is the pressure control mode, determine the current pressure control mode in the pressure control mode according to the current pressure parameter and the target pressure parameter; The step of adjusting 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 includes: When the current working mode is the flow control mode, select at least one set of target flow PID parameters from multiple sets of the preset flow PID parameter groups in the current flow control mode, and adjust the current flow parameter according to at least one set of the target flow PID parameter groups until the current flow parameter reaches the target flow parameter; When the current working mode is the pressure control mode, select at least one set of target pressure PID parameter groups from multiple sets of the preset pressure PID parameter groups in the current pressure control mode, and adjust the current pressure parameter according to the target pressure PID parameter groups until the current pressure parameter reaches the target pressure parameter.

6. The control method according to claim 1, wherein, the step of adjusting 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 includes: Adjusting the opening degree of the electronic control valve in the branch pipeline according to at least one set of the target PID parameter groups until the current state parameter is equal to the target state parameter.

7. The control method according to claim 1, wherein the coolant flowing through each branch pipeline exchanges heat with the device to be temperature-adjusted and then converges at the second parallel node. A bypass pipeline is also connected between the first parallel node and the second parallel node, and the bypass pipeline is arranged in parallel with each branch pipeline. wherein, it further includes: Obtain the current pressure value and the target pressure value range of the main pipeline; Determine the main pipeline target PID parameter group required for the main pipeline according to the current pressure value and the target pressure value range; Adjust the opening degree 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.

8. A control device for a multi-channel chiller, the multi-channel chiller comprises: a chiller box body, a main pipeline, and multiple branch pipelines. Among them, the chiller box body stores coolant and a temperature-adjusting device. The multiple branch pipelines are arranged in parallel and are respectively connected to the main pipeline. The coolant flows out from the liquid outlet of the chiller box body, enters each branch pipeline through the first parallel node of the main pipeline, and temperature-adjusting devices are arranged in each branch pipeline. The coolant flowing through each branch pipeline exchanges heat with the temperature-adjusting device and then flows back to the chiller box body through the liquid return port of the chiller box body. It is characterized by including: a state parameter acquisition module, configured to acquire the current state parameter and the target state parameter of the branch pipeline; A current regulation mode determination module, configured to determine a current regulation mode according to a relative magnitude relationship between the current state parameter and the target state parameter; wherein, under the same regulation mode, the minimum state parameter to the maximum state parameter that the branch pipeline can reach are divided into multiple state parameter ranges in ascending numerical order, and each state parameter range includes multiple state parameters, and there is a one-to-one correspondence between the state parameter ranges and preset PID parameter groups; A state parameter adjustment module, configured to regulate the current state parameter according to at least one group of the target PD parameter groups until the current state parameter is equal to the target state parameter; 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 configured to determine the state parameter ranges to which the current state parameter and the target state parameter belong; and let all the state parameter ranges covered by the current state parameter to the target state parameter be the target state parameter range; The target PID parameter group calling unit is configured to call the preset PID parameter group corresponding to the target state parameter range as the target PID parameter group.

9. A multi-channel chiller system, characterized in that, it includes: 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 according to any one of claims 1-7.

10. A computer-readable storage medium, on which a computer program is stored, characterized in that, when the program is executed by a processor, it implements the control method of the multi-channel chiller according to any one of claims 1-7.

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