CN113959056B - Control method and control device for air conditioner and air conditioner - Google Patents

Abstract

The application relates to the technical field of intelligent household appliances, and discloses a control method for an air conditioner, which comprises the following steps: obtaining the water inlet and outlet temperature of the air conditioner and the current of a compressor of the air conditioner; determining the load regulation speed of the compressor according to the water inlet and outlet temperature and the current; the compressor is controlled to adjust the load at a load adjustment speed. Therefore, the influence of the change of the inlet water temperature and the outlet water temperature on the load adjusting speed of the compressor can be weakened, and the stable operation of the air conditioning unit in the load adjusting process is ensured. The application also discloses a control device for the air conditioner and the air conditioner.

Description

Control method, control device and air conditioner for air conditioner

technical field

The present application relates to the technical field of smart home appliances, for example, to a control method for an air conditioner, a control device and an air conditioner.

Background technique

The water-cooled air-conditioning unit belongs to the indirect refrigeration system. It uses a heat exchanger to exchange heat between water and refrigerant. After the water cools down, it can transfer the cold energy to the air in contact with it, so as to achieve the purpose of cooling. When the user uses the air conditioning unit, a target temperature can be set in advance. When the inlet and outlet water temperature of the air conditioner unit is lower than the target temperature, the air conditioner unit can perform proportional integral differential calculation on the inlet and outlet water temperature to increase the load of the compressor and realize air conditioning. However, when the temperature of the inlet and outlet water changes greatly, the compressor will be loaded rapidly accordingly, which may cause the output of the air conditioning unit to be unstable due to too fast loading or a protection shutdown may occur.

An existing energy-saving control method for an air-conditioning system includes: obtaining the current air-conditioning return water temperature in real time; comparing the current air-conditioning return water temperature with a preset temperature value, and combining the current working mode of the air-conditioning system to obtain a control mode; The control mode outputs the control signal of the loading/unloading module unit in the current loading/unloading cycle; the above steps are repeated until the control signal for maintaining the current number of module units is output.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in related technologies:

The above energy-saving control method can only select one of the loading mode, load shedding mode and maintaining the current working mode according to the return water temperature and working mode of the air conditioner, but it still cannot control the speed of the compressor to adjust the load, so it cannot guarantee that the unit is in load regulation. stable operation during the process.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

Embodiments of the present disclosure provide a control method for an air conditioner, a control device, and an air conditioner, so as to control the speed at which a compressor adjusts a load to ensure stable operation of an air conditioner unit during load adjustment.

In some embodiments, the control method for the air conditioner includes: obtaining the water inlet and outlet temperature of the air conditioner and the current of the compressor of the air conditioner; determining the load adjustment speed of the compressor according to the water inlet and outlet temperature and current; The load is adjusted under the adjustment speed; the inlet and outlet water temperature includes the inlet and outlet water temperature at the current moment and the preset inlet and outlet water temperature, and the current includes the current at the current moment and the current at the previous moment. The current, determining the load adjustment speed of the compressor, includes: determining the current change rate at the current time according to the current at the current time and the current at the previous time; obtaining the current change rate difference and the temperature difference value, the current change rate difference is the difference between the current change rate at the current moment and the preset current change rate, and the temperature difference is the current inlet and outlet water temperature and the preset inlet and outlet water temperature The difference between water temperatures; according to the temperature difference and the current change rate difference, determine the load adjustment speed; according to the temperature difference and the current change rate difference, determine the Load adjustment speed, including: using the temperature difference as the first input parameter, performing proportional integral differential operation to obtain the first proportional integral differential control parameter; using the current change rate difference as the second input parameter, performing proportional integral Differential operation to obtain the second proportional-integral-derivative control parameter; determine the load adjustment speed according to the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter; the compressor includes a For the pulse solenoid valve, determining the load adjustment speed according to the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter includes: determining the change state of the load demand of the air conditioner; according to the Change state, adjust the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter; determine the pulse control signal of the pulse solenoid valve corresponding to the control ratio; according to the pulse control signal that determines the load regulation speed.

In some embodiments, the control device for an air conditioner includes an obtaining module, a determining module and a controlling module. The obtaining module is configured to obtain the inlet and outlet water temperature of the air conditioner and the current of the compressor of the air conditioner; the determination module is configured to determine the load adjustment speed of the compressor according to the inlet and outlet water temperature and the current; the control module is configured to control the compressor The load is adjusted at the load regulation speed; the inlet and outlet water temperature includes the inlet and outlet water temperature at the current moment and the preset inlet and outlet water temperature, the current includes the current at the current moment and the current at the previous moment, and according to the inlet and outlet water temperature and the current, determining the load adjustment speed of the compressor, including: determining the current change rate at the current moment according to the current at the current moment and the current at the previous moment; obtaining the current change rate difference and temperature difference, the current change rate difference is the difference between the current change rate at the current moment and the preset current change rate, and the temperature difference is the current in and out water temperature and the preset current change rate Set the difference between the inlet and outlet water temperatures; determine the load adjustment speed according to the temperature difference and the current change rate difference; determine the load adjustment speed based on the temperature difference and the current change rate difference The load adjustment speed includes: using the temperature difference as a first input parameter, performing a proportional-integral-derivative operation to obtain a first proportional-integral-derivative control parameter; using the current change rate difference as a second input parameter, performing Proportional-integral-derivative operation to obtain a second proportional-integral-derivative control parameter; determine the load adjustment speed according to the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter; the compressor includes For the load pulse solenoid valve, the determination of the load adjustment speed according to the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter includes: determining the change state of the load demand of the air conditioner; The change state is to adjust the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter; determine the pulse control signal of the pulse solenoid valve corresponding to the control ratio; according to the The pulse control signal is used to determine the load regulation speed.

In some embodiments, the control device for an air conditioner includes a processor and a memory storing program instructions. The processor is configured to execute the above-mentioned control method for the air conditioner when executing the program instructions

In some embodiments, the air conditioner includes the above-mentioned control device for air conditioners.

The control method, control device, and air conditioner provided in the embodiments of the present disclosure can achieve the following technical effects:

The load adjustment speed of the compressor is jointly determined by combining the inlet and outlet water temperature of the air conditioner and the current of the compressor, so as to control the compressor to adjust the load at the load adjustment speed. Compared with the prior art, this can weaken the influence of the change of the inlet and outlet water temperature on the load adjustment speed of the compressor, and ensure the stable operation of the air conditioning unit during the load adjustment process.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications and drawings do not constitute a limitation to the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings are not limited to scale and in which:

Fig. 1 is a flowchart of a control method for an air conditioner provided by an embodiment of the present disclosure;

Fig. 2 is a flowchart of a method for determining a load adjustment speed provided by an embodiment of the present disclosure;

Fig. 3 is a schematic diagram of a method for determining the load regulation speed by using proportional integral differential operation provided by an embodiment of the present disclosure;

FIG. 4 is a flow chart of a method for determining a load adjustment speed provided by an embodiment of the present disclosure;

Fig. 5 is a schematic diagram of a control device for an air conditioner provided by an embodiment of the present disclosure;

Fig. 6 is a schematic diagram of a control device for an air conditioner provided by an embodiment of the present disclosure.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first", "second" and the like in the description and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances so as to facilitate the embodiments of the disclosed embodiments described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiments of the present disclosure, the character "/" indicates that the preceding and following objects are an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and/or B means: A or B, or, A and B, these three relationships.

The term "correspondence" may refer to an association relationship or a binding relationship, and the correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

In the embodiments of the present disclosure, a terminal device refers to an electronic device with a wireless connection function. The terminal device can communicate with the above-mentioned smart home appliance by connecting to the Internet, or directly communicate with the above-mentioned smart home appliance through Bluetooth, wifi, etc. Make a communication connection. In some embodiments, the terminal device is, for example, a mobile device, a computer, or a vehicle-mounted device built into a hover vehicle, or any combination thereof. The mobile device may include, for example, a mobile phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, etc., or any combination thereof, wherein the wearable device includes, for example, a smart watch, a smart bracelet, a pedometer, and the like.

Fig. 1 is a flowchart of a control method for an air conditioner provided by an embodiment of the present disclosure. As shown in FIG. 1 , an embodiment of the present disclosure provides a control method for an air conditioner, which may include:

S11. The processor obtains the temperature of the water entering and leaving the air conditioner and the current of the compressor of the air conditioner.

Here, the inlet and outlet water temperature may include the inlet and outlet water temperature at the current moment, the inlet and outlet water temperature at the previous moment, and the preset inlet and outlet water temperature. The current may include the current at the current moment and the current at the previous moment.

Optionally, the embodiments of the present disclosure may provide various implementation manners to obtain the temperature of the water in and out of the air conditioner and the current of the compressor of the air conditioner. The following example illustrates.

In one way, when it is determined that the air conditioner is turned on, the temperature of the water in and out of the air conditioner and the current of the compressor of the air conditioner can be continuously obtained, so as to accurately obtain the temperature and current of the water in and out of the air conditioner at the current moment during the control process, as well as the water in and out of the previous moment. temperature and current.

In another way, when it is determined that the air conditioner is turned on, the temperature of the water in and out of the air conditioner and the current of the compressor of the air conditioner can be obtained periodically, for example, the temperature of the water in and out of the air conditioner and the current of the compressor of the air conditioner can be obtained every 5 minutes. In order to reduce the amount of data processing while maintaining dynamic control. Correspondingly, the inlet and outlet water temperature and current at the previous moment are the inlet and outlet water temperature and current 5 minutes ago.

S12, the processor determines the load adjustment speed of the compressor according to the temperature and current of the incoming and outgoing water.

S13, the processor controls the compressor to adjust the load at the load adjustment speed.

The control method for the air conditioner provided by the embodiments of the present disclosure is used to determine the load adjustment speed of the compressor in combination with the water inlet and outlet temperature of the air conditioner and the current of the compressor, so as to control the compressor to adjust the load at the load adjustment speed. In this way, the influence of the change of the inlet and outlet water temperature on the load adjustment speed of the compressor can be weakened, so as to ensure the stable operation of the air conditioning unit during the load adjustment process.

Fig. 2 is a flow chart of a method for determining a load regulation speed provided by an embodiment of the present disclosure. Fig. 3 is a schematic diagram of a method for determining a load regulation speed by using a proportional integral differential operation provided by an embodiment of the present disclosure.

In Figure 3, T _S is the preset inlet and outlet water temperature, T ₁ is the current inlet and outlet water temperature, p ₁ is the first proportional control parameter, i ₁ is the first integral control parameter, d ₁ is the first differential control parameter , K ₁ is the first proportional-integral-derivative control parameter, i _S is the preset current change rate, i is the current change rate at the current moment, p ₂ is the second proportional control parameter, i ₂ is the second integral control parameter, d ₂ is the second differential control parameter, _K2 is the second proportional integral differential control parameter, and S is the pulse control signal of the pulse solenoid valve corresponding to the control ratio.

Further, as shown in Figure 2 and Figure 3, the processor determines the load adjustment speed of the compressor according to the temperature and current of the water entering and exiting, which may include:

S21. The processor determines the current change rate at the current moment according to the current at the current moment and the current at the previous moment.

Here, the processor can determine the current change rate at the current moment by the following method:

Among them, i is the current change rate at the current moment, I ₁ is the current at the current moment, I ₀ is the current at the previous moment, and t is the duration between the current moment and the previous moment.

S22, the processor obtains the current change rate difference and the temperature difference value, the current change rate difference is the difference between the current change rate at the current moment and the preset current change rate, and the temperature difference is the current moment of the inlet and outlet water temperature and Preset the difference between the inlet and outlet water temperatures.

Here, the preset current change rate and the preset inlet and outlet water temperatures can be preset according to the developer's operating instructions. Specifically, developers can issue operating instructions to set the current change rate and the temperature of the incoming and outgoing water through the control terminal associated with the air conditioner. The aforementioned control terminal may be an air conditioner remote controller, or may be a terminal device that establishes wireless communication with the air conditioner. Optionally, the manner of wireless communication may at least include one or more of Wi-Fi communication, Zigbee protocol communication and Bluetooth communication.

S23. The processor determines the load adjustment speed according to the temperature difference and the current change rate difference.

Optionally, the processor determines the load adjustment speed according to the temperature difference and the current change rate difference, which may include: the processor uses the temperature difference as a first input parameter, and performs a proportional integral differential operation to obtain a first proportional integral differential control parameter; the processor uses the current change rate difference as the second input parameter, and performs proportional integral differential operation to obtain the second proportional integral differential control parameter; the processor according to the first proportional integral differential control parameter and the second proportional integral differential control parameter, Determines the load regulation speed. In this way, using the temperature difference and the current change rate difference to comprehensively control the load adjustment speed can avoid the unstable operation of the air conditioner caused by only using the temperature difference to control the load adjustment speed, and weaken the influence of the change of the inlet and outlet water temperature on the load adjustment speed of the compressor. , to ensure the stable operation of the air conditioning unit in the process of adjusting the load. Moreover, the proportional integral differential control method can be used to quickly, smoothly and accurately adjust the load of the compressor, and achieve good results.

In summary, using the method for determining the load adjustment speed provided by the embodiments of the present disclosure, the load adjustment speed can be determined in combination with the temperature difference and the current change rate difference, and the compressor can be subsequently controlled to adjust the load according to the load adjustment speed to ensure that the unit Stable operation during load regulation.

Fig. 4 is a flow chart of a method for determining a load regulation speed provided by an embodiment of the present disclosure. Further, as shown in FIG. 4, the processor determines the load adjustment speed according to the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter, which may include:

S41. The processor determines the change state of the load demand of the air conditioner.

Optionally, the processor determining the change state of the load demand of the air conditioner may include: the change rate of the inlet water temperature at the current moment is less than or equal to the first change rate threshold, and/or the current change rate at the current moment is less than or equal to the first change rate threshold. In the case of two rate-of-change thresholds, the processor determines that the change state is a steady change; the rate of change of the inlet water temperature at the current moment is greater than the first rate-of-change threshold, and/or the current rate of change at the current moment is greater than the second rate-of-change threshold case, the processor determines that the change of state is a drastic change. When the load demand of the air conditioner changes drastically, the cooling capacity of the air conditioner cannot be adjusted in time, resulting in a large change in the inlet water temperature. In order to stabilize the inlet water temperature, the compressor will quickly adjust the load, causing the compressor current to change drastically. Therefore, by detecting the change rate of the inlet water temperature and/or the current change rate, the change state of the load demand of the air conditioner can be accurately judged.

Here, the processor can determine the rate of change of the inlet water temperature at the current moment in the following manner:

Among them, T is the change rate of the inlet water temperature at the current moment, T ₁ is the inlet water temperature at the current moment, T ₀ is the inlet water temperature at the previous moment, and t is the time length between the current moment and the previous moment.

Optionally, the value range of the first change rate threshold may be 0.1°C/s˜1°C/s.

Optionally, the value range of the second change rate threshold may be 1.0A/s˜1.5A/s.

S42. The processor adjusts the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter according to the change state.

Optionally, the processor adjusts the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter according to the change state, which may include: when the change state is a steady change, the processor increases the control ratio Scale; in case the change state is a drastic change, the processor reduces the control scale.

Here, increasing the control ratio may be reflected in increasing the first proportional-integral-derivative control parameter, and/or decreasing the second proportional-integral-derivative control parameter. Decreasing the control ratio may be reflected in reducing the first proportional-integral-derivative control parameter, and/or increasing the second proportional-integral-derivative control parameter.

When the load demand of the air conditioner changes drastically, the temperature of the inlet and outlet water will also change drastically. At this time, reduce the control ratio, that is, reduce the first proportional-integral-derivative control parameter, and/or increase the second proportional-integral-derivative control parameter, which can use the change of the compressor current to strengthen the control of the load adjustment speed of the compressor and weaken the in-out The influence of water temperature changes on the compressor load adjustment speed ensures the stable operation of the air conditioning unit during the load adjustment process. When the load demand of the air conditioner changes steadily, the temperature of the inlet and outlet water also changes steadily. At this time, increase the control ratio, that is, increase the first proportional-integral-derivative control parameter, and/or decrease the second proportional-integral-derivative control parameter, which can use the change of inlet and outlet water temperature to strengthen the control of the load adjustment speed of the compressor, so that the compression The air conditioner can quickly adjust the load, so that the load demand of the air conditioner can quickly meet the user's requirements and ensure the user's experience.

S43, the processor determines the pulse control signal of the pulse solenoid valve corresponding to the control ratio.

In the actual application process, the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter is 0.4:0.6 as an example, then the processor determines the pulse control signal of the pulse solenoid valve corresponding to the control ratio, which can be Reflected:

S=0.4×K ₁ +0.6×K ₂

Among them, S is the pulse control signal, _K1 is the first proportional-integral-derivative control parameter, and _K2 is the second proportional-integral-derivative control parameter.

Further, when the load demand of the air conditioner remains stable and the compressor is fully loaded, the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter may be 1:0.

S44, the processor determines the load adjustment speed according to the pulse control signal.

Optionally, the processor determines the load adjustment speed according to the pulse control signal, which may include: the processor determines the pulse frequency corresponding to the pulse control signal according to the preset association relationship; the processor uses the value of the pulse frequency as the value of the load adjustment speed ; Wherein, the preset correlation is the correlation between pulse control signals and pulse frequencies corresponding to different control ratios. Since the energization mode of the pulse solenoid valve is pulse energization, the energization time of the pulse solenoid valve can be controlled by adjusting the pulse frequency of the pulse control signal, and then the load adjustment speed can be intelligently controlled.

As an example, the preset correlation between the pulse control signal and the pulse frequency corresponding to different control ratios in the embodiments of the present disclosure may be shown in Table 3-1.

pulse control signal Pulse frequency <![CDATA[S₁]]> <![CDATA[f₁]]> <![CDATA[S₂]]> <![CDATA[f₂]]> <![CDATA[S₃]]> <![CDATA[f₃]]> <![CDATA[S₄]]> <![CDATA[f₄]]>

Table 3-1

Wherein, in the preset correlation, the pulse frequency and the pulse control signal are positively correlated. That is, the stronger the pulse control signal, the higher the pulse frequency; the weaker the pulse control signal, the lower the pulse frequency.

In summary, using the method for determining the load adjustment speed provided by the embodiments of the present disclosure, since the load demand of the air conditioner will affect the temperature of the inlet and outlet water, thereby affecting the load change of the compressor, the temperature difference and current are adjusted according to the change state of the load demand of the air conditioner The control ratio between the change rate difference can weaken the influence of the change of the inlet and outlet water temperature on the load adjustment speed of the compressor, so as to ensure the stable operation of the air conditioning unit during the load adjustment process.

Fig. 5 is a schematic diagram of a control device for an air conditioner provided by an embodiment of the present disclosure. As shown in FIG. 5 , an embodiment of the present disclosure provides a control device for an air conditioner, including an obtaining module 51 , a determining module 52 and a control module 53 . The obtaining module 51 is configured to obtain the temperature of the air-conditioning inlet and outlet water and the current of the compressor of the air conditioner; the determination module 52 is configured to determine the load adjustment speed of the compressor according to the temperature of the inlet and outlet water and the current; the control module 53 is configured to control the compressor Regulates the load at load regulation speed.

Using the control device for air conditioners provided by the embodiments of the present disclosure, through the cooperation of the acquisition module, the determination module and the control module, the influence of the change of the inlet and outlet water temperature on the load adjustment speed of the compressor can be weakened, so as to ensure that the air conditioner unit is adjusting the load. stable operation during the process.

Fig. 6 is a schematic diagram of a control device for an air conditioner provided by an embodiment of the present disclosure. As shown in FIG. 6 , an embodiment of the present disclosure provides a control device for an air conditioner, including a processor (processor) 100 and a memory (memory) 101 . Optionally, the device may also include a communication interface (Communication Interface) 102 and a bus 103. Wherein, the processor 100 , the communication interface 102 , and the memory 101 can communicate with each other through the bus 103 . Communication interface 102 may be used for information transfer. The processor 100 can call the logic instructions in the memory 101 to execute the control method for the air conditioner in the above embodiments.

In addition, the above logic instructions in the memory 101 may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as an independent product.

As a computer-readable storage medium, the memory 101 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 100 executes the program instructions/modules stored in the memory 101 to execute functional applications and data processing, that is, to realize the control method for the air conditioner in the above-mentioned embodiments.

The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include a high-speed random access memory, and may also include a non-volatile memory.

An embodiment of the present disclosure provides an air conditioner, including the above-mentioned control device for an air conditioner.

An embodiment of the present disclosure provides a storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above-mentioned control method for an air conditioner.

The above-mentioned storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.

The technical solutions of the embodiments of the present disclosure can be embodied in the form of software products, which are stored in a storage medium and include one or more instructions to make a computer device (which can be a personal computer, a server, or a network equipment, etc.) to perform all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc. A medium that can store program code, or a transitory storage medium.

The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, procedural, and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Also, the terms used in the present application are used to describe the embodiments only and are not used to limit the claims. As used in the examples and description of the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well unless the context clearly indicates otherwise . Similarly, the term "and/or" as used in this application is meant to include any and all possible combinations of one or more of the associated listed ones. Additionally, when used in this application, the term "comprise" and its variants "comprises" and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these. Without further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of additional identical elements in the process, method or apparatus comprising said element. Herein, what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other. For the method, product, etc. disclosed in the embodiment, if it corresponds to the method part disclosed in the embodiment, then the relevant part can refer to the description of the method part.

Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software may depend on the specific application and design constraints of the technical solution. Said artisans may implement the described functions using different methods for each particular application, but such implementation should not be regarded as exceeding the scope of the disclosed embodiments. The skilled person can clearly understand that for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units may only be a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined Or it can be integrated into another system, or some features can be ignored, or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiments of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the disclosure. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than that disclosed in the description, and sometimes there is no specific agreement between different operations or steps. order. For example, two consecutive operations or steps may, in fact, be performed substantially concurrently, or they may sometimes be performed in the reverse order, depending upon the functionality involved. Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

Claims (7)

1. A control method for an air conditioner, comprising:

obtaining the water inlet and outlet temperature of an air conditioner and the current of a compressor of the air conditioner;

determining a load regulation speed of the compressor according to the water inlet and outlet temperature and the current;

controlling the compressor to adjust a load at the load adjustment speed;

the water inlet and outlet temperature comprises a water inlet and outlet temperature at the current moment and a preset water inlet and outlet temperature, the current comprises a current at the current moment and a current at the previous moment, and the load adjusting speed of the compressor is determined according to the water inlet and outlet temperature and the current, and the method comprises the following steps:

determining the current change rate of the current moment according to the current at the current moment and the current at the previous moment;

obtaining a current change rate difference value and a temperature difference value, wherein the current change rate difference value is a difference value between the current change rate at the current moment and a preset current change rate, and the temperature difference value is a difference value between the water inlet and outlet temperature at the current moment and the preset water inlet and outlet temperature;

determining the load regulation speed according to the temperature difference value and the current change rate difference value;

the determining the load regulation speed according to the temperature difference value and the current change rate difference value comprises the following steps:

taking the temperature difference value as a first input parameter, and performing proportional-integral-derivative operation to obtain a first proportional-integral-derivative control parameter;

taking the current change rate difference value as a second input parameter, and performing proportional-integral-derivative operation to obtain a second proportional-integral-derivative control parameter;

determining the load regulation speed according to the first proportional integral derivative control parameter and the second proportional integral derivative control parameter;

the compressor includes a pulse solenoid valve for regulating a load, the determining the load regulation speed according to the first proportional integral derivative control parameter and the second proportional integral derivative control parameter includes:

determining a change state of the load demand of the air conditioner;

according to the change state, adjusting a control proportion between the first proportional integral derivative control parameter and the second proportional integral derivative control parameter;

determining a pulse control signal of the pulse electromagnetic valve corresponding to the control proportion;

and determining the load adjusting speed according to the pulse control signal.

2. The control method according to claim 1, wherein the determining a change state of the load demand of the air conditioner includes:

determining that the change state is stable change under the condition that the change rate of the water inlet temperature at the current moment is smaller than or equal to a first change rate threshold value and/or the change rate of the current at the current moment is smaller than or equal to a second change rate threshold value;

when the change rate of the water inlet temperature at the current moment is greater than a first change rate threshold value and/or the current change rate at the current moment is greater than a second change rate threshold value, determining that the change state is a severe change;

the determination mode of the water inlet temperature change rate at the current moment comprises the following steps:

wherein T is the water inlet temperature change rate at the current moment, T ₁ T is the water inlet temperature at the current moment ₀ And t is the time length between the current time and the previous time, and is the water inlet temperature at the previous time.

3. The control method according to claim 2, characterized in that the adjusting of the control ratio between the first proportional-integral-derivative control parameter and the second proportional-integral-derivative control parameter according to the change state includes:

increasing the control ratio in the case that the change state is a stable change;

in the case where the change state is a drastic change, the control ratio is reduced.

4. The control method according to claim 1, wherein the determining the load adjustment speed according to the pulse control signal includes:

determining the pulse frequency corresponding to the pulse control signal according to a preset association relation;

taking the value of the pulse frequency as the value of the load adjusting speed;

the preset association relationship is an association relationship between pulse control signals and pulse frequencies corresponding to different control proportions.

5. A control device for an air conditioner, comprising:

an obtaining module configured to obtain an inlet and outlet water temperature of an air conditioner and a current of a compressor of the air conditioner;

a determining module configured to determine a load regulation speed of the compressor based on the inlet and outlet water temperature and the current;

a control module configured to control the compressor to adjust a load at the load adjustment speed;

the water inlet and outlet temperature comprises a water inlet and outlet temperature at the current moment and a preset water inlet and outlet temperature, the current comprises a current at the current moment and a current at the previous moment, and the load adjusting speed of the compressor is determined according to the water inlet and outlet temperature and the current, and the method comprises the following steps:

determining the current change rate of the current moment according to the current at the current moment and the current at the previous moment;

obtaining a current change rate difference value and a temperature difference value, wherein the current change rate difference value is a difference value between the current change rate at the current moment and a preset current change rate, and the temperature difference value is a difference value between the water inlet and outlet temperature at the current moment and the preset water inlet and outlet temperature;

determining the load regulation speed according to the temperature difference value and the current change rate difference value;

the determining the load regulation speed according to the temperature difference value and the current change rate difference value comprises the following steps:

taking the temperature difference value as a first input parameter, and performing proportional-integral-derivative operation to obtain a first proportional-integral-derivative control parameter;

taking the current change rate difference value as a second input parameter, and performing proportional-integral-derivative operation to obtain a second proportional-integral-derivative control parameter;

determining the load regulation speed according to the first proportional integral derivative control parameter and the second proportional integral derivative control parameter;

the compressor includes a pulse solenoid valve for regulating a load, the determining the load regulation speed according to the first proportional integral derivative control parameter and the second proportional integral derivative control parameter includes:

determining a change state of the load demand of the air conditioner;

according to the change state, adjusting a control proportion between the first proportional integral derivative control parameter and the second proportional integral derivative control parameter;

determining a pulse control signal of the pulse electromagnetic valve corresponding to the control proportion;

and determining the load adjusting speed according to the pulse control signal.

6. A control apparatus for an air conditioner comprising a processor and a memory storing program instructions, wherein the processor is configured to perform the control method for an air conditioner according to any one of claims 1 to 4 when executing the program instructions.

7. An air conditioner comprising the control device for an air conditioner according to claim 5 or 6.

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