CN114811839B

CN114811839B - Central air conditioner, control method and device of central air conditioner and readable storage medium

Info

Publication number: CN114811839B
Application number: CN202210504373.7A
Authority: CN
Inventors: 张毅; 杨志华; 刘雅岚; 贺斌; 曾华杰
Original assignee: Midea Group Co Ltd; Chongqing Midea General Refrigeration Equipment Co Ltd
Current assignee: Meitong Energy Technology Chongqing Co ltd; Midea Group Co Ltd; Chongqing Midea General Refrigeration Equipment Co Ltd
Priority date: 2022-05-10
Filing date: 2022-05-10
Publication date: 2023-06-02
Anticipated expiration: 2042-05-10
Also published as: CN114811839A

Abstract

The invention provides a central air conditioner, a control method and a device of the central air conditioner and a readable storage medium, wherein the control method of the central air conditioner comprises the following steps: collecting a first parameter value and a second parameter value of a central air conditioner; determining an actual limit value of the second parameter value according to the comparison result of the first parameter value and the first limit value; controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limiting value; wherein the first parameter value and the second parameter value are different and associated. When the second parameter value reaches the actual limit value, the central air conditioner is controlled to execute corresponding protection action, and the second parameter value does not reach the original set limit value. By adjusting the second parameter value in advance, the problem that abnormal operation of the system occurs when the second parameter value reaches the original set limit value can be avoided.

Description

Central air conditioner, control method and device of central air conditioner and readable storage medium

Technical Field

The invention belongs to the technical field of air conditioning equipment, and particularly relates to a central air conditioner, a control method of the central air conditioner, a control device of the central air conditioner and a readable storage medium.

Background

In order to ensure that the central air conditioner can stably run, a load limiting value needs to be set for part of parameters in the central air conditioner, and when the parameters reach the load limiting value, the load limiting action is executed. However, when certain parameters reach the load limiting value, a problem of abnormal operation of the system may have occurred, and even if the load limiting action is performed, abnormal operation of the system may not be prevented, resulting in limited load limiting effect.

Disclosure of Invention

The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

In view of this, in a first aspect, the present invention proposes a control method of a central air conditioner, including: collecting a first parameter value and a second parameter value of a central air conditioner; determining an actual limit value of the second parameter value according to the comparison result of the first parameter value and the first limit value; controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limiting value; wherein the first parameter value and the second parameter value are different and associated.

The control method of the central air conditioner provided by the invention needs to collect the first parameter value and the second parameter value in the central air conditioner in the running process of the central air conditioner, then compares the first parameter value with the first limit value, and determines the actual limit value aiming at the second parameter value according to the comparison result. And comparing the second parameter value with the actual limiting value to determine whether the second parameter value is close to the actual limiting value, thereby determining whether the central air conditioner needs to execute the related protection function or not, and determining the running state of the central air conditioner according to the mode.

Note that, the first parameter value and the second parameter value mentioned above refer to parameter values for a certain component in the central air conditioner, however, since a plurality of components in the central air conditioner may each have a respective parameter value, the target component for collecting the parameter values is not specifically limited in the present invention, and the control method of the central air conditioner in the present invention is applicable to the component having the target parameter value in the central air conditioner. For example, the target component of the collected parameters may be a compressor or a heat exchanger in a central air conditioner, etc.

The first parameter value and the second parameter value are different, namely different parameter values in the central air conditioner are collected, for example, the first parameter value is a current value of the heat exchanger, and the second parameter value is a water outlet temperature value of the heat exchanger. It is noted that the first and second acquisition values are associated parameters, e.g. there may be a causal relationship between the first and second parameter values, a proportional or inversely proportional relationship between the first and second parameter values, etc.

According to the comparison result of the first parameter value and the first limit value, the value of the first parameter value can be obtained, so that the actual limit value of the second parameter value can be determined according to the comparison result. For example, the closer the first parameter value is to the first limit value, the more likely the second parameter value will reach the limit value, and in order to be able to adjust the second parameter value in time, the original set limit value for the second parameter value needs to be changed. When the second parameter value reaches the actual limit value, the central air conditioner is controlled to execute corresponding protection action, and the second parameter value does not reach the original set limit value. By adjusting the second parameter value in advance, the problem that abnormal operation of the system occurs when the second parameter value reaches the original set limit value can be avoided, the second parameter value is adjusted in time under the condition that the second parameter value does not reach the severe condition, the operation stability of the system is improved, and the failure rate of the system is reduced.

Through the comparison result of the first parameter value and the first limit value, whether the second parameter value is about to be abnormal or not can be early warned, so that the actual limit value can be timely determined, and the central air conditioner can be operated more safely and reliably.

The action protection for the second parameter value may be to perform a load limiting action.

In addition, according to the control method of the central air conditioner in the technical scheme provided by the invention, the control method also has the following additional technical characteristics:

in the above technical solution, determining the actual limit value of the second parameter value according to the comparison result of the first parameter value and the first limit value includes: in case the first parameter value is smaller than the product of the first limiting value and the first protection coefficient, the actual limiting value is equal to the product of the second limiting value and the first limiting coefficient; in the case that the first parameter value is greater than the product of the first limit value and the first protection coefficient, and the first parameter value is less than the product of the first limit value and the second protection coefficient, the actual limit value is equal to the product of the second limit value and the second limit coefficient; the first protection coefficient is smaller than the second protection coefficient, and the first limit coefficient is larger than the second limit coefficient; the second limit value is a set limit value for the second parameter value.

In this embodiment, since the first protection coefficient is smaller than the second protection coefficient, the first parameter value is smaller than the product of the first limit value and the first protection coefficient, and the first parameter value is relatively smaller. In the case where the first parameter value is larger than the product of the first limit value and the first protection coefficient and the first parameter value is smaller than the first limit value and the second protection coefficient, the second parameter value is relatively larger.

The second limit value is a set limit value of the second parameter value, that is, the second limit value belongs to a limit value preset for the second parameter value, and when the second limit value reaches the preset limit value, a system fault may already be caused, so that an actual limit value needs to be determined.

Since the first limiting coefficient is larger than the second limiting coefficient, the actual limiting value is relatively larger when the actual limiting value is the product of the second limiting value and the first limiting coefficient. When the actual limit value is the product of the second limit value and the second limit coefficient, the actual limit value is relatively small.

From the above analysis, it is known that the actual limit value is larger when the first parameter value is smaller, and the actual limit value is smaller when the first parameter value is larger. When the first parameter value is relatively smaller, the system is not indicated to reach the time when the protection action is required to be executed, and the first parameter value is associated with the second parameter value, so that the second parameter value is also in a relatively safe range, the protection action does not need to be executed in advance, and the actual limit value can be relatively larger at the moment, so that the situation that the protection action is executed in advance due to normal operation of the system is avoided. When the first parameter value is relatively large, the system is close to the range where the protection action needs to be executed, meanwhile, the second parameter value is also in the relatively dangerous range, in order to ensure that the system can timely make the protection action, the actual limit value needs to be reduced, compared with the condition that the second parameter value reaches the set limit value, when the second parameter value reaches the actual limit value, the system makes the protection action, and the operation parameters of the system can be adjusted in advance, so that the second parameter value is adjusted, and when the second parameter value does not reach the worse condition, the second parameter value is adjusted timely, thereby being beneficial to improving the operation stability of the system.

In any of the above solutions, determining the actual limit value of the second parameter value according to the comparison result between the first parameter value and the first limit value, further includes: in the case that the first parameter value is greater than the product of the first limit value and the second protection coefficient, and the first parameter value is less than the first limit value, the actual limit value is equal to the product of the second limit value and the third limit coefficient; controlling the central air conditioner to operate in a system protection mode under the condition that the first parameter value is larger than or equal to a first limit value; wherein the second limiting coefficient is greater than the third limiting coefficient.

In this embodiment, the second parameter value is relatively small when the first parameter value is larger than the product of the first limit value and the first protection coefficient and the first parameter value is smaller than the first limit value and the second protection coefficient. In the case where the first parameter value is larger than the first limit value and the second protection coefficient and smaller than the first limit value, the second parameter value is relatively larger at this time.

Since the second limiting coefficient is larger than the third limiting coefficient, the actual limiting value is relatively large when the actual limiting value is the product of the third limiting value and the first limiting coefficient. When the actual limit value is the product of the second limit value and the first limit coefficient, the actual limit value is relatively small.

According to the analysis, when the first parameter value is close to the first limit value, the system is closer to the range where the protection action needs to be executed, and the second parameter value is in the relatively dangerous range, so that the actual limit value needs to be further reduced in order to ensure that the system can make the protection action in time.

According to the invention, three gears are set for the actual limiting value, and the actual limiting value is further reduced, so that a protection action can be further performed in advance, and compared with the mode of setting two gears, the situation that the second parameter value changes faster and the protection action is not performed can be prevented. Thus, when the first parameter value is closer to the first limit value, the actual limit value is reduced, and the operation stability of the system is further improved. Of course, in other designs, two gears or more than three gears may be provided for the actual limit value.

When the first parameter value is greater than or equal to the first limit value, it is indicated that the first parameter value has reached a dangerous range, and because the first parameter value is associated with the second parameter value, the second parameter value has also reached a dangerous range, which is indicated that the load limiting action does not have a good effect. In order to avoid the system from continuing to be abnormal and generating faults, the central air conditioner needs to be controlled to enter a system protection mode. The system protection mode is not limited to shutdown or outputting reminding information, and a worker can check and maintain the central air conditioner in time after receiving the reminding information.

In any of the above technical solutions, controlling the operation state of the central air conditioner according to the comparison result of the second parameter value and the actual limit value includes: under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and the first threshold value coefficient, controlling the central air conditioner to operate in a load reduction mode so as to reduce the second parameter value; under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and the second threshold value coefficient, controlling the central air conditioner to operate in a load limiting mode; wherein the first threshold coefficient is greater than the second threshold coefficient.

In this embodiment, since the first threshold coefficient is larger than the second threshold coefficient, the second parameter value is relatively larger when the second parameter value reaches the product of the actual limit value and the first threshold coefficient. The second parameter value is relatively small when it reaches the product of the actual limit value and the second threshold coefficient.

When the second parameter value reaches the product of the actual limit value and the first threshold value coefficient, the central air conditioner is controlled to operate in the load reduction mode because the second parameter value is relatively large. For example, the first parameter value is a current value of the heat exchanger, and the second parameter value is a water outlet temperature value of the heat exchanger. And when the outlet water temperature value is higher, the current value of the heat exchanger is reduced, so that the outlet water temperature value is reduced, and the running stability of the system is ensured.

When the second parameter value reaches the product of the actual limit value and the second threshold coefficient, the central air conditioner is controlled to operate in the limit mode at the moment because the second parameter value is relatively smaller. For example, the current value of the heat exchanger is kept unchanged, so that the outlet water temperature value is prevented from being further increased.

In any of the above technical solutions, controlling the operation state of the central air conditioner according to the comparison result between the second parameter value and the actual limit value, further includes: under the condition that the second parameter value is smaller than or equal to the product of the actual limiting value and the third threshold value coefficient, controlling the central air conditioner to exit the load limiting mode; wherein the second threshold coefficient is greater than the third threshold coefficient.

In the technical scheme, because the second threshold coefficient is larger than the third threshold coefficient, when the second parameter value does not reach the product of the actual limiting value and the third threshold coefficient, the value of the second parameter value is smaller, namely, the distance between the second parameter value and the actual limiting value is larger, and the load limiting of the central air conditioner is not needed at the moment, so that the load limiting mode can be exited, and the stable operation of the system is ensured.

In any of the foregoing solutions, the first parameter value includes at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value; the second parameter value includes at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value.

In the technical scheme, the acquisition object of the winding temperature value is a winding in the motor. The collection objects of the condensing pressure value and the evaporating pressure value are refrigerants. The collection object of the current value can be the current value of any functional component in the central air conditioner. The collection object of the power value can be the power value of any functional component in the central air conditioner. The load value may be a load value of any functional component in the central air conditioner, and may be expressed as an absolute value or a relative value of power or torque. The collection object of the frozen water inlet temperature value and the frozen water outlet temperature value is a water chilling unit in the central air conditioner. The collection object of the cooling inlet water temperature value and the cooling outlet water temperature value is a cooling tower.

The first parameter value and the second parameter value may be two kinds of parameter values, and it should be noted that the first parameter value and the second parameter value are selected by selecting different parameters, and the two parameters need to have an association relationship.

In a second aspect, the present invention provides a control device for a central air conditioner, including: the acquisition module acquires a first parameter value and a second parameter value of the central air conditioner; the determining module is used for determining an actual limit value of the second parameter value according to a comparison result of the first parameter value and the first limit value; the control module is used for controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limiting value; wherein the first parameter value and the second parameter value are different and associated.

In the running process of the central air conditioner, the first parameter value and the second parameter value in the central air conditioner are required to be collected, then the first parameter value is compared with the first limit value, and the actual limit value for the second parameter value is determined according to the comparison result. And comparing the second parameter value with the actual limiting value to determine whether the second parameter value is close to the actual limiting value, thereby determining whether the central air conditioner needs to execute the related protection function or not, and determining the running state of the central air conditioner according to the mode.

In the above technical solution, the determining module is specifically configured to: in case the first parameter value is smaller than the product of the first limiting value and the first protection coefficient, the actual limiting value is equal to the product of the second limiting value and the first limiting coefficient; in the case that the first parameter value is greater than the product of the first limit value and the first protection coefficient, and the first parameter value is less than the product of the first limit value and the second protection coefficient, the actual limit value is equal to the product of the second limit value and the second limit coefficient; the first protection coefficient is smaller than the second protection coefficient, and the first limit coefficient is larger than the second limit coefficient; the second limit value is a set limit value for the second parameter value.

In any of the above solutions, the determining module is further configured to: in the case that the first parameter value is greater than the product of the first limit value and the second protection coefficient, and the first parameter value is less than the first limit value, the actual limit value is equal to the product of the second limit value and the third limit coefficient; controlling the central air conditioner to operate in a system protection mode under the condition that the first parameter value is larger than or equal to a first limit value; wherein the second limiting coefficient is greater than the third limiting coefficient.

In any of the above technical solutions, the control module is specifically configured to: under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and the first threshold value coefficient, controlling the central air conditioner to operate in a load reduction mode so as to reduce the second parameter value; under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and the second threshold value coefficient, controlling the central air conditioner to operate in a load limiting mode; wherein the first threshold coefficient is greater than the second threshold coefficient.

In any of the above solutions, the control module is further configured to: under the condition that the second parameter value is smaller than or equal to the product of the actual limiting value and the third threshold value coefficient, controlling the central air conditioner to exit the load limiting mode; wherein the second threshold coefficient is greater than the third threshold coefficient.

In any of the foregoing embodiments, the parameters in the first parameter value include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooled water inlet temperature and cooled water outlet temperature; the parameters in the second parameter values include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooling water inlet temperature and cooling water outlet temperature.

In a third aspect, the present invention provides a control device for a central air conditioner, including: the controller and the memory, wherein, the memory stores programs or instructions, and the controller realizes the steps of the control method in any technical scheme when executing the programs or instructions in the memory. And can realize the same technical effects, and are not described in detail herein.

In a fourth aspect, the present invention proposes a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement the steps of the control method according to any of the above-mentioned aspects. And can realize the same technical effects, and are not described in detail herein.

In a fifth aspect, the present invention provides an evaporative cooling water system comprising: a control device according to any one of the above aspects; and/or a readable storage medium as in the above-described aspects. And can realize the same technical effects, and are not described in detail herein.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 shows one of flowcharts of a control method of a central air conditioner in an embodiment of the present invention;

FIG. 2 is a second flowchart of a control method of a central air conditioner according to an embodiment of the present invention;

FIG. 3 is a third flowchart of a control method of a central air conditioner according to an embodiment of the present invention;

fig. 4 shows one of schematic block diagrams of a control device of a central air conditioner in an embodiment of the present invention;

Fig. 5 shows a second schematic block diagram of a control device of a central air conditioner in an embodiment of the present invention.

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.

A central air conditioner, a control method of the central air conditioner, a control apparatus of the central air conditioner, and a readable storage medium provided according to some embodiments of the present invention are described below with reference to fig. 1 to 5.

As shown in fig. 1, in some embodiments of the present invention, a control method of a central air conditioner is provided, including:

step 102, collecting a first parameter value and a second parameter value of a central air conditioner;

step 104, obtaining an actual limit value of the second parameter value based on the comparison result of the first parameter value and the first limit value;

And step 106, controlling the operation state of the central air conditioner based on the comparison result of the second parameter value and the actual limit value.

The first parameter value is different from the second parameter value and the first parameter value and the second parameter value are associated.

In the control method of the central air conditioner provided by the embodiment, the first parameter value and the second parameter value in the central air conditioner are required to be collected in the running process of the central air conditioner, then the first parameter value is compared with the first limit value, and the actual limit value for the second parameter value is determined according to the comparison result. And comparing the second parameter value with the actual limiting value to determine whether the second parameter value is close to the actual limiting value, thereby determining whether the central air conditioner needs to execute the related protection function or not, and determining the running state of the central air conditioner according to the mode.

In the above embodiment, the step of obtaining the actual limit value of the second parameter value based on the comparison result of the first parameter value and the first limit value includes: based on the product of the first limit value and the first protection coefficient being greater than the first parameter value, the actual limit value is the product of the second limit value and the first limit coefficient; based on the product of the first limiting value and the first protection coefficient being smaller than the first parameter value and the product of the first limiting value and the second protection coefficient being larger than the first parameter value, the actual limiting value is the product of the second limiting value and the second limiting coefficient.

The second protection coefficient is larger than the first protection coefficient, and the second limit coefficient is smaller than the first limit coefficient; the second limit value belongs to a set limit value for the second parameter value.

In this embodiment, since the first protection coefficient is smaller than the second protection coefficient, in the case where the first parameter value is smaller than the product of the first limit value and the first protection coefficient, the first parameter value is relatively smaller. In the case where the first parameter value is larger than the product of the first limit value and the first protection coefficient and the first parameter value is smaller than the first limit value and the second protection coefficient, the second parameter value is relatively larger.

In any of the above embodiments, the step of obtaining the actual limit value of the second parameter value based on the comparison result of the first parameter value and the first limit value further includes: based on the product of the first limit value and the second protection coefficient being smaller than the first parameter value and the first limit value being greater than the first parameter value, the actual limit value is the product of the second limit value and the third limit coefficient; and based on the first limiting value being smaller than or equal to the first parameter value, the central air conditioner operates in a system protection mode.

The third limiting coefficient is smaller than the second limiting coefficient.

In this embodiment, in the case where the first parameter value is larger than the product of the first limit value and the first protection coefficient, and the first parameter value is smaller than the first limit value and the second protection coefficient, the second parameter value is relatively smaller at this time. In the case where the first parameter value is larger than the first limit value and the second protection coefficient and smaller than the first limit value, the second parameter value is relatively larger at this time.

In any of the above embodiments, the step of controlling the operation state of the central air conditioner based on the comparison result of the second parameter value and the actual limit value includes: based on the product of the actual limiting value and the first threshold value coefficient being smaller than or equal to the second parameter value, the central air conditioner operates in a load reduction mode, so that the second parameter value is reduced; and based on the product of the actual limiting value and the second threshold value coefficient being smaller than or equal to the second parameter value, the central air conditioner operates in the load limiting mode. Wherein the second threshold coefficient is smaller than the first threshold coefficient.

In any of the above embodiments, the step of controlling the operation state of the central air conditioner based on the comparison result of the second parameter value and the actual limit value further includes: and based on the product of the actual limiting value and the third threshold value coefficient being greater than or equal to the second parameter value, the central air conditioner exits the load limiting mode. Wherein the third threshold coefficient is smaller than the second threshold coefficient.

In this embodiment, since the second threshold coefficient is larger than the third threshold coefficient, when the second parameter value does not reach the product of the actual limit value and the third threshold coefficient, the value of the second parameter value is smaller, that is, the difference between the distance of the second parameter value and the actual limit value is larger, and the load limiting of the central air conditioner is not needed, so that the load limiting mode can be exited, and the stable operation of the system is ensured.

In any of the above embodiments, the first parameter value comprises at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value; the second parameter value includes at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value.

In this embodiment, the object of collection of the winding temperature values is a winding in the motor. The collection objects of the condensing pressure value and the evaporating pressure value are refrigerants. The collection object of the current value can be the current value of any functional component in the central air conditioner. The collection object of the power value can be the power value of any functional component in the central air conditioner. The load value may be a load value of any functional component in the central air conditioner, and may be expressed as an absolute value or a relative value of power or torque. The collection object of the frozen water inlet temperature value and the frozen water outlet temperature value is a water chilling unit in the central air conditioner. The collection object of the cooling inlet water temperature value and the cooling outlet water temperature value is a cooling tower.

As shown in fig. 2, in one possible embodiment, the control method of the central air conditioner includes:

step 202, collecting a first parameter value;

step 204, the unit in the central air conditioner operates;

step 206, performing step 208 if the product of the first limit value and the first protection coefficient is greater than the first parameter value, and performing step 210 if not;

step 208, the actual limiting value is the product of the second limiting value and the first limiting coefficient;

step 210, if the product of the first limit value and the first protection coefficient is smaller than the first parameter value, and if the product of the first limit value and the second protection coefficient is larger than the first parameter value, step 212 is executed, otherwise step 214 is executed; wherein the second protection factor is greater than the first protection factor;

step 212, the actual limiting value is the product of the second limiting value and the second limiting coefficient; wherein the second limiting coefficient is smaller than the first limiting coefficient;

step 214, if the product of the first limit value and the second protection coefficient is smaller than the first parameter value, and the first limit value is larger than the first parameter value, step 216 is executed, and if not, step 218 is executed;

Step 216, the actual limiting value is the product of the second limiting value and the third limiting coefficient; wherein the third limiting coefficient is smaller than the second limiting coefficient;

step 218, the first limit value is less than or equal to the first parameter value, if yes, step 220 is executed, if not, ending;

step 220, the central air conditioner operates in a system protection mode.

When the second parameter value reaches the actual limit value, the central air conditioner is controlled to execute corresponding protection action, and the second parameter value does not reach the original set limit value. By adjusting the second parameter value in advance, the problem that abnormal operation of the system occurs when the second parameter value reaches the original set limit value can be avoided, the second parameter value is adjusted in time under the condition that the second parameter value does not reach the severe condition, the operation stability of the system is improved, and the failure rate of the system is reduced.

As shown in fig. 3, in one possible embodiment, the control method of the central air conditioner includes:

Step 302, collecting a second parameter value;

step 304, running a unit in a central air conditioner;

step 306, the product of the actual limit value and the first threshold coefficient is smaller than or equal to the second parameter value, if yes, step 308 is executed, and if not, step 310 is executed;

step 308, the central air conditioner operates in a load reduction mode;

step 310, the product of the actual limit value and the second threshold coefficient is less than or equal to the second parameter value, if yes, step 312 is executed, and if not, step 314 is executed; wherein the second threshold coefficient is less than the first threshold coefficient;

step 312, the central air conditioner operates in a load limiting mode;

step 314, if the product of the actual limit value and the third threshold coefficient is greater than or equal to the second parameter value, executing step 316, otherwise, ending; wherein the third threshold coefficient is less than the second threshold coefficient;

step 316, the central air conditioner exits the load limiting mode.

Through the mode, the running mode of the central air conditioner is adjusted, and the stable running of the system is ensured.

As shown in fig. 4, in some embodiments of the present invention, a control apparatus 400 of a central air conditioner is provided, including:

the acquisition module 410 acquires a first parameter value and a second parameter value of the central air conditioner;

A determining module 420, configured to obtain an actual limit value of the second parameter value based on a comparison result of the first parameter value and the first limit value;

the control module 430 controls an operation state of the central air conditioner based on a comparison result of the second parameter value and the actual limit value. The first parameter value is different from the second parameter value and the first parameter value and the second parameter value are associated.

In the above embodiment, the determining module is specifically configured to: in the case that the first parameter value is smaller than the product of the first limiting value and the first protection coefficient, based on the product of the first limiting value and the first protection coefficient being larger than the first parameter value, the actual limiting value is the product of the second limiting value and the first limiting coefficient; based on the product of the first limiting value and the first protection coefficient being smaller than the first parameter value and the product of the first limiting value and the second protection coefficient being larger than the first parameter value, the actual limiting value is the product of the second limiting value and the second limiting coefficient.

In any of the above embodiments, the determining module is further configured to: based on the product of the first limit value and the second protection coefficient being smaller than the first parameter value and the first limit value being greater than the first parameter value, the actual limit value is the product of the second limit value and the third limit coefficient; and based on the first limiting value being smaller than or equal to the first parameter value, the central air conditioner operates in a system protection mode.

The third limiting coefficient is smaller than the second limiting coefficient.

In any of the foregoing embodiments, the control module is specifically configured to: based on the product of the actual limiting value and the first threshold value coefficient being smaller than or equal to the second parameter value, the central air conditioner operates in a load reduction mode, so that the second parameter value is reduced; and based on the product of the actual limiting value and the second threshold value coefficient being smaller than or equal to the second parameter value, the central air conditioner operates in the load limiting mode. Wherein the second threshold coefficient is smaller than the first threshold coefficient.

In any of the above embodiments, the control module is further configured to: and based on the product of the actual limiting value and the third threshold value coefficient being greater than or equal to the second parameter value, the central air conditioner exits the load limiting mode. Wherein the third threshold coefficient is smaller than the second threshold coefficient.

In any of the above embodiments, the parameters in the first parameter value include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooled water inlet temperature and cooled water outlet temperature; the parameters in the second parameter values include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooling water inlet temperature and cooling water outlet temperature.

As shown in fig. 5, in an embodiment of the present invention, a control device 500 of a central air conditioner is provided, including: a controller 510 and a memory 520, wherein the memory 520 stores a program or instructions, and the controller 510 implements the steps of the control method in any of the embodiments described above when executing the program or instructions in the memory 520, and can achieve the same technical effects.

In an embodiment of the present invention, a readable storage medium is provided, on which a program or an instruction is stored, which when executed by a processor, implements the steps of the control method in any of the above embodiments, and can achieve the same technical effects.

In an embodiment of the present invention, there is provided an evaporative cooling water system including: the control device as in any one of the above embodiments; and/or a readable storage medium as in the above embodiments, and can achieve the same technical effects.

In the present invention, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A control method of a central air conditioner, comprising:

collecting a first parameter value and a second parameter value of the central air conditioner;

determining an actual limit value of the second parameter value according to the comparison result of the first parameter value and the first limit value;

controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limit value;

wherein the first parameter value and the second parameter value are different and associated;

the determining the actual limiting value of the second parameter value according to the comparison result of the first parameter value and the first limiting value comprises the following steps:

in the case that the first parameter value is smaller than the product of the first limiting value and the first protection coefficient, the actual limiting value is equal to the product of the second limiting value and the first limiting coefficient;

in the case that the first parameter value is greater than the product of the first limit value and the first protection coefficient, and the first parameter value is less than the product of the first limit value and the second protection coefficient, the actual limit value is equal to the product of the second limit value and the second limit coefficient;

Wherein the first protection factor is smaller than the second protection factor, and the first limiting factor is larger than the second limiting factor;

the second limit value is a set limit value for the second parameter value;

and controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limit value, wherein the running state comprises the following steps:

controlling the central air conditioner to operate in a load reduction mode so as to reduce the second parameter value under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and a first threshold value coefficient;

controlling the central air conditioner to operate in a load limiting mode under the condition that the second parameter value is larger than or equal to the product of the actual limiting value and a second threshold value coefficient;

wherein the first threshold coefficient is greater than the second threshold coefficient.

2. The control method according to claim 1, wherein the determining the actual limit value of the second parameter value based on the comparison result of the first parameter value and the first limit value further comprises:

in the case where the first parameter value is greater than the product of the first limit value and the second protection coefficient, and the first parameter value is less than the first limit value, the actual limit value is equal to the product of the second limit value and a third limit coefficient;

Controlling the central air conditioner to operate in a system protection mode under the condition that the first parameter value is greater than or equal to the first limit value;

wherein the second limiting coefficient is greater than the third limiting coefficient.

3. The control method according to claim 1 or 2, characterized in that the controlling the operation state of the central air conditioner according to the comparison result of the second parameter value and the actual limit value further comprises:

controlling the central air conditioner to exit the load limiting mode under the condition that the second parameter value is smaller than or equal to the product of the actual limiting value and a third threshold value coefficient;

wherein the second threshold coefficient is greater than the third threshold coefficient.

4. The control method according to claim 1, wherein,

the first parameter value includes at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value;

the second parameter value includes at least one of: winding temperature value, condensing pressure value, evaporating pressure value, current value, power value, load value, frozen water inlet temperature value, frozen water outlet temperature value, cooled water inlet temperature value and cooled water outlet temperature value.

5. A control device of a central air conditioner, characterized by comprising:

the acquisition module acquires a first parameter value and a second parameter value of the central air conditioner;

the determining module is used for determining an actual limit value of the second parameter value according to a comparison result of the first parameter value and the first limit value;

the control module is used for controlling the running state of the central air conditioner according to the comparison result of the second parameter value and the actual limit value;

the determining module is specifically configured to:

The second limit value is a set limit value for the second parameter value;

the control module is specifically used for:

6. The control device of claim 5, wherein the determination module is further configured to:

7. The control device of claim 5 or 6, wherein the control module is further configured to:

8. The control device according to claim 5, wherein,

the parameters in the first parameter values include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooled water inlet temperature and cooled water outlet temperature;

the parameters in the second parameter values include: winding temperature, condensing pressure, evaporating pressure, current, power, load, frozen water inlet temperature, frozen water outlet temperature, cooling water inlet temperature and cooling water outlet temperature.

9. A control device of a central air conditioner, characterized by comprising:

a controller and a memory, wherein the memory has stored therein a program or instructions which when executed by the controller performs the steps of the method according to any of claims 1 to 4.

10. A readable storage medium, characterized in that it stores thereon a program or instructions which, when executed by a processor, implement the steps of the method according to any of claims 1 to 4.

11. A central air conditioner, comprising:

the control device according to any one of claims 5 to 9; and/or

The readable storage medium of claim 10.