WO2020215771A1

WO2020215771A1 - Variable-frequency air conditioner control method and device, and variable-frequency air conditioner

Info

Publication number: WO2020215771A1
Application number: PCT/CN2019/127700
Authority: WO
Inventors: 罗荣邦; 许文明
Original assignee: 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2019-04-26
Filing date: 2019-12-24
Publication date: 2020-10-29
Also published as: CN111854084A

Abstract

A variable-frequency air conditioner control method and device, and a variable-frequency air conditioner. The variable-frequency air conditioner control method comprises: determining the target frequency f of the running of an air conditioner according to an outdoor ambient temperature Tao; and determining a relationship between the target frequency f and the winding demarcation point frequency f4 of the motor of an air-conditioning compressor, determining a motor winding mode and an oil return and pause policy of the air conditioner according to the relationship between the target frequency f and the winding demarcation point frequency f4, and in the process of adjusting the frequency of the air conditioner from the winding demarcation point frequency f4 to the target frequency f, inserting an oil return and pause platform. Therefore, the present invention can combine the target frequency f of the air conditioner with the state switching of a coil winding and the oil return control of the air conditioner, thereby precisely controlling the running of the air conditioner and improving the energy efficiency of the running of the air conditioner.

Description

Control method and control device of inverter air conditioner and inverter air conditioner

This application is filed based on a Chinese patent application with an application number of 201910345360.8 and an application date of April 26, 2019, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by reference.

Technical field

This application relates to the technical field of air conditioners, for example, to a control method, a control device and an inverter air conditioner of an inverter air conditioner.

Background technique

At present, with the development of economy and the improvement of living standards, people have a higher demand for inverter air conditioners with better comfort adjustment and energy saving.

The air conditioner compressor of the existing air conditioner will resonate with the casing, the motor, the pipeline, etc. when running at certain frequencies, resulting in poor noise and excessive pipeline stress. When the air conditioner is protected and released, it should run slowly to stabilize the system. However, with the different outdoor and outside working conditions, the internal unit has different operating loads. For some special situations, the operation of the air conditioner compressor will be unstable. This may cause the air conditioner compressor to fail to operate normally, resulting in unstable operation of the compressor.

Summary of the invention

In order to have a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not a general comment, nor is it intended to determine key/important components or describe the protection scope of these embodiments, but serves as a preface to the detailed description that follows.

The embodiment of the present disclosure proposes a control method, a control device, and an inverter air conditioner for an inverter air conditioner, which can combine the target frequency f of the air conditioner with the state switching of the coil windings, and at the same time insert the oil return pause platform to return the oil to realize the air conditioner Fine control of the operation, while ensuring the oil return of the air conditioner, and improving the energy efficiency of the air conditioner.

According to an aspect of the embodiments of the present disclosure, there is provided a control method of an inverter air conditioner.

In some optional embodiments, the method includes:

Determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

Determine the relationship between the target frequency f and the winding demarcation point frequency f4, and determine the air conditioning motor winding mode and oil return pause strategy according to the relationship between the target frequency f and the winding demarcation point frequency f4.

According to an aspect of the embodiments of the present disclosure, there is provided a control device for an inverter air conditioner.

In some optional embodiments, the device includes:

The calculation module is configured to determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

The judgment module is configured to judge the relationship between the target frequency f and the winding demarcation point frequency f4;

The control module is configured to determine the motor winding mode and the oil return pause strategy of the air conditioner according to the relationship between the target frequency f and the winding demarcation point frequency f4, and insert the return signal when the air conditioner frequency is adjusted from the winding demarcation point frequency f4 to the target frequency f Oil standstill platform.

According to an aspect of an embodiment of the present disclosure, an inverter air conditioner is provided.

In some optional embodiments, the inverter air conditioner includes the aforementioned control device.

Some technical solutions provided by the embodiments of the present disclosure can achieve the following technical effects:

The relationship between the target frequency f and the winding boundary frequency f4 can be combined with the winding mode switching of the coil, and the winding mode of the motor coil can be adjusted according to the relationship between the target frequency f and the winding boundary frequency f4, so that the air conditioner is in the frequency adjustment process The operating frequency of the air conditioner can always be matched with the winding mode of the coil, which can not only reduce the starting current of the motor, but also realize the large torque output of the motor, realize the fine control of the air conditioner operation, and improve the energy efficiency of the air conditioner. At the same time, since the oil return pause platform is inserted during the air conditioner frequency conversion process, the air conditioner can be controlled to return oil during the air conditioner frequency conversion process, avoiding insufficient oil return during the air conditioner frequency conversion process and causing compressor damage, and forming effective protection for the compressor operation.

The above general description and the following description are only exemplary and explanatory, and are not used to limit the application.

Description of the drawings

One or more embodiments are exemplified by the accompanying drawings. These exemplified descriptions and drawings do not constitute a limitation on the embodiments. Elements with the same reference numbers in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

Fig. 1 is a flowchart of a control method of an inverter air conditioner according to an embodiment of the present disclosure;

FIG. 2 is another flowchart of a control method of an inverter air conditioner according to an embodiment of the present disclosure;

Fig. 3 is a schematic diagram of an embodiment of a control device for an inverter air conditioner according to an embodiment of the present disclosure;

4 is a schematic diagram of another embodiment of a control device for an inverter air conditioner according to an embodiment of the present disclosure;

5 is a schematic diagram of another embodiment of a control device for an inverter air conditioner according to an embodiment of the present disclosure;

6 is a schematic diagram of a calculation module of a control device of an inverter air conditioner according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of an electronic device provided by an embodiment of the present disclosure.

Reference signs:

10-calculation module; 20-judgment module; 30-control module; 40-frequency comparison module; 50-wind speed comparison module; 60-real-time detection module; 100-processor; 101-memory; 102-communication interface; 103 -bus.

Detailed ways

In order to have a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The attached drawings are for reference and explanation purposes only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a number of details are used to provide a sufficient understanding of the disclosed embodiments. However, without these details, one or more embodiments can still be implemented. In other cases, in order to simplify the drawings, well-known structures and devices may be simply shown.

With reference to Figure 1, an embodiment of the present disclosure provides a control method of an inverter air conditioner, including:

S1: Determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

Optionally, for example, the cooling mode can be selected to start, the air conditioner can be provided with a real-time detection module 60, a calculation module 10, a judgment module 20, and a control module 30. The real-time detection module 60 obtains the outdoor ambient temperature Tao through a temperature sensor. Other modules directly obtain the outdoor ambient temperature, and then calculate the target frequency f through the calculation module 10.

S2. Determine the relationship between the target frequency f and the winding demarcation point frequency f4 of the motor of the air-conditioning compressor, and determine the motor winding mode and oil return pause strategy of the air conditioner according to the relationship between the target frequency f and the winding demarcation point frequency f4. When the frequency is adjusted from the winding demarcation point frequency f4 to the target frequency f, the oil return pause platform is inserted.

In the embodiments of the present disclosure, a temperature detection device such as a temperature sensor can be used to obtain the outdoor ambient temperature Tao, and then the calculation module calculates the target frequency f of the air conditioning operation according to the outdoor ambient temperature Tao, and then the judgment module determines the target frequency f and the winding boundary Point the relationship between the frequency f4, and send the judgment result to the control module 10, and the control module 10 determines the motor winding mode according to the judgment result; finally, the determination module determines the motor winding mode according to the control command issued by the control module 10. When the target frequency f is greater than the winding demarcation point frequency f4, first run the air conditioner frequency to the winding demarcation point frequency f4, and then switch the motor winding mode. After the motor winding mode switch is completed, change the air conditioning frequency from the winding demarcation point frequency f4 Adjust to the target frequency f. During the adjustment, insert the oil return pause platform to perform oil return treatment to ensure the reliability and stability of compressor operation.

When using this control method to control the inverter air conditioner, the relationship between the target frequency f and the winding boundary frequency f4 can be combined with the winding mode switching of the coil, according to the relationship between the target frequency f and the winding boundary frequency f4 Adjust the winding mode of the motor coil so that the operating rate of the air conditioner can always match the winding mode of the coil during the frequency adjustment process, which can not only reduce the motor starting current, but also realize the large torque output of the motor, and realize the operation of the air conditioner. Fine control to improve the energy efficiency of air conditioning. At the same time, since the oil return pause platform is inserted during the air conditioner frequency conversion process, the air conditioner can be controlled to return oil during the air conditioner frequency conversion process, avoiding insufficient oil return during the air conditioner frequency conversion process and causing compressor damage, and forming effective protection for the compressor operation.

The above-mentioned winding demarcation point frequency f4 can be set by the user according to actual motor parameters, or can be directly calculated and determined by the controller or the like.

In the embodiment of the present disclosure, the target frequency f=F*K, where F is the rated operating frequency of the air conditioner, K is the frequency coefficient, and K is related to the ambient temperature.

The above-mentioned air conditioner operation state can be cooling or heating.

The step of inserting the oil return pause platform when the air conditioner frequency is adjusted from the winding demarcation point frequency f4 to the target frequency f includes: if the target frequency f is greater than the winding demarcation point frequency f4, control the motor to select the first winding mode, in the first winding mode Run the air conditioner frequency to the winding demarcation point frequency f4; after the air conditioner frequency reaches the winding demarcation point frequency f4, control the motor to select the second winding mode, and run the air conditioner frequency to the target frequency f in the second winding mode; The oil return pause platform is inserted during the frequency from the winding demarcation point frequency f4 to the target frequency f.

The step of inserting the oil return pause platform during the process of operating the air conditioner frequency from the winding demarcation point frequency f4 to the target frequency f includes: after the air conditioner frequency reaches the winding demarcation point frequency f4, operating the air conditioning frequency to the first frequency at the first frequency modulation speed V1 A frequency f1 enters the first oil return pause platform and continues for t1; after the first oil return pause platform ends, the air-conditioning frequency is operated at the second frequency modulation speed V2 to the second frequency f2, enters the second oil return pause platform and Continue for t2 time; after the end of the second oil return pause platform, run the air conditioning frequency to the third frequency f3 at the third frequency modulation speed V3, enter the third oil return pause platform and continue for t3 time; end at the third oil return pause platform After that, the air conditioner frequency is operated to the target frequency f at the fourth frequency modulation speed V4, wherein the motor winding of the air conditioner compressor is set as the first winding with larger impedance and the second winding with smaller impedance, and the first winding is set The winding boundary frequency of the winding and the second winding is f4, the frequency of the first oil return pause platform is f1, the frequency of the second oil return pause platform is f2, and the frequency of the third oil return pause platform is f3, f1, f2, and f3 Both are greater than f4.

Specifically, set the winding mode of the motor to star type and triangle type, set its demarcation point frequency f4, set the winding switching demarcation point frequency f4 to 65Hz (adjustable according to the motor winding parameters), and switch the position through the winding switch part Describe the winding structure of the motor to make it choose star or delta connection. Set the first frequency of the first oil return pause platform to f1 (adjustable at 75Hz) and time as the first pause time t1 (adjustable at 1min); The second frequency of the oil return pause platform is f2 (adjustable at 85 Hz) and the time is the second pause time t2 (adjustable for 1 min); the third frequency of the third oil return pause platform is f3 (adjustable at 95 Hz) and the time is the third pause Time t3 (1min adjustable).

As shown in Figure 2, in some embodiments, the method further includes: S101, correcting the target frequency f according to the windshield of the outdoor fan of the air conditioner. When the wind speed of the outdoor fan windshield of the air conditioner is r≤r1, the target frequency is corrected negatively. ; When r>r2, the target frequency is corrected in the positive direction, where r1 and r2 are the preset wind speed values.

When the air conditioner outdoor unit has different windshields, after the target frequency f obtained by the above calculation, the target frequency f is corrected according to the windshield of the air conditioner outdoor fan; when the wind speed of the air conditioner outdoor fan windshield r≤r1, the target frequency is corrected negatively , To prevent condensation or freezing; when r1<r≤r2, the target frequency is not corrected; when r>r2, the target frequency is positively corrected to prevent overheating and reduce the output of the evaporator.

Optionally, when there is a windshield on the outdoor unit of the air conditioner, f=F*K+c, where F is the rated frequency of air conditioner operation, K is the frequency coefficient, K is related to the outdoor ambient temperature, c is the frequency correction value, 0＜K＜ 1.

For example, take K=0.5, and set the outdoor fan windshield to mute, low wind, medium wind, high wind, and strong. The corresponding speed r is 500rpm, 800rpm, 1200rpm, 1500rpm, 1700rpm (rpm is the abbreviation of Revolutions Per minute, is R/min); The preset wind speed value r1 is 900rpm and r2 is 1500rpm.

According to f=F*K+c, according to the current wind speed of the outdoor fan windshield, c is determined, f is calculated, and then in step S2, if f is determined to be less than f4, the star winding method is selected to control the air conditioning compressor to adjust the frequency to the target Frequency f. During this process, the frequency modulation speed of the air-conditioning compressor can run to the target frequency f at 0.5 Hz/s. Conversely, if the calculated f is greater than or equal to f4, first select the star winding mode and make the air-conditioning compressor run at 0.5 Hz/s to the winding boundary frequency f4. At this moment, the control is switched to the delta winding connection, and the The air conditioner compressor is tuned to the target frequency f. In this process, you can choose to adjust the frequency at a constant speed or to the target frequency.

Optionally, in step S2, the motor and the air-conditioning compressor are connected through a winding switching part, the winding structure of the motor is switched by the winding switching part, and the control is controlled according to the results of determining the magnitude of f and f4 The winding switching unit switches operations.

The motor is a three-phase motor having three-phase windings of U-phase, V-phase, and W-phase. Two terminals of each phase winding of the motor are connected to the winding switching part, and the winding switching part switches the connection of the terminals, To switch to star winding connection as the first winding method or delta winding connection as the second winding method.

Optionally, when the outdoor unit of the air conditioner has no windshield, that is, in silent mode, the target frequency f=F*K, where F is the rated operating frequency of the air conditioner, K is the frequency coefficient, K is related to the outdoor ambient temperature, and 0<K<1.

For example, take K=0.5, and set the mute speed of the outdoor fan r=500rpm (rpm is the abbreviation of Revolutions Per minute, which is revolutions per minute).

According to f=F*K, determine the target frequency f, where F=200Hz, K is 0.5, f is 100HZ, and then in step S2, it is determined that f is greater than f4, then the star winding method is selected to control the air-conditioning compressor frequency adjustment to The target frequency f. In this process, the frequency modulation speed of the air-conditioning compressor can run to the target frequency f at 0.5 Hz/s. Conversely, if the calculated f is greater than or equal to f4, first select the star winding mode and make the air-conditioning compressor run at 0.5 Hz/s to the winding boundary frequency f4. At this moment, the control is switched to the delta winding connection, and the The air-conditioning compressor is tuned to the target frequency f. In this process, you can choose to adjust the frequency to the target frequency at a constant speed. The frequency modulation here can be up-frequency or down-frequency, which needs to be determined by referring to the relationship between the current operating frequency of the air conditioner and f and f4.

The embodiment of the present disclosure provides a control device for an inverter air conditioner.

With reference to Figure 3, in some embodiments, the control device of the inverter air conditioner includes:

The calculation module 10 is configured to determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

The determining module 20 is configured to determine the relationship between the target frequency f and the winding demarcation point frequency f4;

The control module 30 is configured to determine the motor winding mode and the oil return pause strategy of the air conditioner according to the relationship between the target frequency f and the winding demarcation point frequency f4, and insert it when the air conditioner frequency is adjusted from the winding demarcation point frequency f4 to the target frequency f The oil return stalls the platform.

In this embodiment, the calculation module 10 calculates the target frequency f based on the obtained outdoor ambient temperature Tao, the judgment module 20 judges the magnitude relationship between f and f4 according to the calculated target frequency f, and the control module 30 judges according to the judgment module 20 If the result is that f is less than f4, control the air conditioner compressor to select the first winding mode of the motor and run the air conditioner compressor to the target frequency f. If the judgment result is that f is greater than or equal to f4, control the air conditioner compressor to select the first winding mode of the motor (star Type winding mode), make the air conditioner compressor run to the winding boundary frequency f4, switch to the second winding mode connection (delta winding mode), make the air conditioner compressor run to the target frequency f, and insert three in the process A platform for oil return pause.

In this embodiment, according to the judgment result of the judgment module 20 that f is greater than f4, the control module 30 first selects the first winding mode and runs the air-conditioning compressor to the winding boundary frequency f4, and then switches to the second winding mode. , And then continue to run the compressor, and run the air-conditioning compressor to the first oil return pause platform for the first pause time t1, and after the first pause time expires, make the air-conditioning compressor run to the second oil return pause platform for the second pause Time t2: After the second pause time is over, the air conditioner compressor is run to the third oil return pause platform for the third pause time t3; after the third pause time is over, the air conditioner compressor is run to the target frequency f.

As shown in Figure 4, in some embodiments, the device further includes:

The frequency comparison module 40 is configured to compare the operating frequency of the air conditioner compressor with the winding boundary frequency f4, obtain the comparison result, and send it to the control module 30;

The control module 30 controls the motor winding mode and operating frequency of the air-conditioning compressor according to the received comparison result of the frequency comparison module 40, and continuously controls the operating frequency of the air-conditioning compressor.

In this embodiment, after the judgment module 20 judges the magnitude results of f and f4, the frequency comparison module 40 compares the operating frequency of the air-conditioning compressor with the winding boundary frequency f4, and compares the result It is sent to the control module 30, and the control module 30 controls the motor winding mode of the air conditioner compressor according to the comparison result, and then controls the operating frequency of the air conditioner compressor to run to the target frequency value.

As shown in Figure 4, in some embodiments, the device further includes:

The wind speed comparison module 50 is configured to compare the windshield wind speed of the outdoor unit of the air conditioner with a preset wind speed, obtain a comparison result, and send it to the control module 30;

The control module 30 corrects the target frequency f according to the comparison result of the wind speed comparison module 50.

In this embodiment, on the basis of the frequency comparison module 40 described above, the comparison result obtained by the wind speed comparison module 50 may also be sent to the control module 30, and the control module 30 is based on the comparison result of the wind speed comparison module 50 The target frequency is corrected. The judgment module 20 judges the magnitude relationship between f and f4 according to the revised target frequency f, and then sends it to the control module 30. The control module 30 controls the motor winding mode of the air-conditioning compressor according to the judgment result, and then controls the air-conditioning compressor The running frequency of running to the target frequency value.

As shown in Figure 5, in some embodiments, the device further includes:

The real-time detection module 60 is configured to detect the operating frequency, windshield wind speed, and outdoor ambient temperature of the air conditioner compressor in real time, and send the detected outdoor ambient temperature to the calculation module 10, and the detected air conditioner The operating frequency of the compressor is sent to the frequency comparison module 40, and the detected windshield wind speed of the air conditioner compressor is sent to the wind speed comparison module 50 respectively.

In this embodiment, the frequency comparison module 40 and the wind speed comparison module 50 can detect the operating frequency and windshield wind speed of the air conditioner compressor in real time through the real-time detection module 60 to obtain corresponding parameters, and the calculation module 10 can also use the real-time detection module 60 The outdoor ambient temperature detected in real time acquires the corresponding parameters.

As shown in FIG. 6, in some embodiments, the calculation module 10 is configured to calculate the target frequency f according to the result of the outdoor ambient temperature Tao.

In this embodiment, the outdoor ambient temperature Tao is first obtained through the outdoor ambient temperature sensor, and then the calculation module 10 calculates the target frequency f through Tao. The calculation formula for the target frequency f has been explained in the above method embodiment. This will not repeat them one by one.

The embodiment of the present disclosure provides an inverter air conditioner.

The embodiment of the present disclosure also provides an inverter air conditioner, including the above-mentioned control device.

The embodiment of the present disclosure also provides an inverter air conditioner, including: at least one processor; and

A memory that is communicatively connected with at least one processor; wherein the memory stores instructions that can be executed by at least one processor, and when the instructions are executed by at least one processor, the at least one processor executes the aforementioned control method.

The embodiment of the present disclosure also provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above-mentioned control method.

The embodiments of the present disclosure also provide a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by a computer, The computer executes the above control method.

The aforementioned computer-readable storage medium may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The embodiment of the present disclosure also provides an electronic device, the structure of which is shown in FIG. 7, and the electronic device includes:

At least one processor (processor) 100, one processor 100 is taken as an example in FIG. 3; and a memory (memory) 101 may also include a communication interface (Communication Interface) 102 and a bus 103. Among them, the processor 100, the communication interface 102, and the memory 101 can communicate with each other through the bus 103. The communication interface 102 can be used for information transmission. The processor 100 may call logic instructions in the memory 101 to execute the control method of the foregoing embodiment.

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

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 functional applications and data processing by running software programs, instructions, and modules stored in the memory 101, that is, implements the control method in the foregoing method embodiment.

The memory 101 may include a program storage area and a data storage area. 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.

The technical solutions of the embodiments of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to enable a computer device (which can be a personal computer, a server, or a network). Equipment, etc.) execute all or part of the steps of the method described in the embodiments of the present disclosure. The aforementioned storage medium may 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 disk, etc. A medium that can store program codes, or it can be a transient storage medium.

The above description and drawings fully illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The embodiments only represent possible changes. Unless explicitly required, individual components and functions are optional, and the order of operations can be changed. Parts and features of some embodiments may be included in or substituted for parts and features of other embodiments. The scope of the embodiments of the present disclosure includes the entire scope of the claims and all available equivalents of the claims. When used in this application, although the terms "first", "second", etc. may be used in this application to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without changing the meaning of the description, the first element can be called the second element, and similarly, the second element can be called the first element, as long as all occurrences of the "first element" are renamed consistently and all occurrences "Second component" can be renamed consistently. The first element and the second element are both elements, but they may not be the same element. Moreover, the terms used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms of "a" (a), "one" (an) and "the" (the) are intended to also include plural forms . Similarly, the term "and/or" as used in this application refers to any and all possible combinations of one or more of the associated lists. In addition, when used in this application, the term "comprise" (comprise) and its variants "comprises" and/or including (comprising) and the like refer to the stated features, wholes, steps, operations, elements, and/or The existence of components does not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and/or groups of these. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other same elements in the process, method, or device that includes the element. In this article, each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, see the descriptions in the method parts for relevant points.

Those skilled in the art may be aware that the units and algorithm steps of the examples described in the embodiments disclosed in this specification 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 constraint conditions of the technical solution. The technicians may use different methods for each specific application to realize the described functions, but such realization should not be considered as going beyond the scope of the embodiments of the present disclosure. The technicians can clearly understand that, for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which is not repeated here.

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

The flowcharts and block diagrams in the drawings show the possible implementation architecture, functions, and operations of the system, method, and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, program segment, or part of the code, and the module, program segment, or part of the code contains one or more functions for realizing the specified logical function. Executable instructions. In some alternative implementations, the functions marked in the block may also occur in a different order from the order marked in the drawings. For example, two consecutive blocks can actually be executed in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. Each block in the block diagram and/or flowchart, and the combination of the blocks in the block diagram and/or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by dedicated hardware Realized in combination with computer instructions.

Claims

A control method of an inverter air conditioner, characterized in that it comprises:

Determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

Determine the relationship between the target frequency f and the winding boundary frequency f4 of the motor of the air-conditioning compressor;

Determine the motor winding mode and oil return pause strategy of the air conditioner according to the relationship between the target frequency f and the winding boundary frequency f4, and insert the oil return pause platform when the air conditioner frequency is adjusted from the winding boundary frequency f4 to the target frequency f.
The method according to claim 1, characterized in that inserting the oil return pause platform during the process of adjusting the air conditioner frequency from the winding demarcation point frequency f4 to the target frequency f comprises:

In the case where the target frequency f is greater than the winding demarcation point frequency f4, control the motor to select the first winding mode, and operate the air conditioner frequency to the winding demarcation point frequency f4 in the first winding mode;

After the air conditioner frequency reaches the winding boundary frequency f4, control the motor to select the second winding mode, and run the air conditioner frequency to the target frequency f in the second winding mode;

Insert the oil return pause platform during the process of running the air conditioner frequency from the winding demarcation point frequency f4 to the target frequency f.
The control method of the inverter air conditioner according to claim 2, characterized in that, inserting the oil return pause platform during the operation of the air conditioner frequency from the winding demarcation point frequency f4 to the target frequency f comprises:

After the air conditioner frequency reaches the winding dividing point frequency f4, run the air conditioner frequency to the first frequency f1 at the first frequency modulation speed V1, enter the first oil return stop platform and continue for t1;

After the first oil return pause platform ends, run the air conditioner frequency to the second frequency f2 at the second frequency modulation speed V2, enter the second oil return pause platform and continue for t2;

After the second oil return pause platform ends, run the air conditioner frequency to the third frequency f3 at the third frequency modulation speed V3, enter the third oil return pause platform and continue for t3;

After the third oil return pause platform ends, run the air conditioner frequency to the target frequency f at the fourth frequency modulation speed V4;

Among them, the motor windings of the air conditioner compressor are the first winding mode with larger impedance and the second winding mode with smaller impedance. The frequency of the first oil return pause platform is f1, the frequency of the second oil return pause platform is f2, The frequency of the three-return oil stop platform is f3, and f1, f2, and f3 are all greater than f4.
The method according to claim 1, further comprising:

Correct the target frequency f according to the windshield of the outdoor fan of the air conditioner. When the wind speed of the windshield of the outdoor fan of the air conditioner is r≤r1, the target frequency is corrected negatively; when r>r2, the target frequency is corrected positively;

Among them, r1 and r2 are preset wind speed values.
A control device for an inverter air conditioner, characterized in that it comprises:

The calculation module is configured to determine the target frequency f of air conditioning operation according to the outdoor ambient temperature Tao;

The judgment module is configured to judge the relationship between the target frequency f and the winding demarcation point frequency f4;

The control module is configured to determine the motor winding mode and the oil return pause strategy of the air conditioner according to the relationship between the target frequency f and the winding demarcation point frequency f4, and insert the return signal when the air conditioner frequency is adjusted from the winding demarcation point frequency f4 to the target frequency f Oil standstill platform.
The device according to claim 5, further comprising:

The frequency comparison module is configured to compare the operating frequency of the air conditioner compressor with the frequency of the oil return stop platform, obtain the comparison result, and send it to the control module;

The time comparison module is configured to compare the operating time of the air-conditioning compressor with the preset oil return pause time, obtain the comparison result, and send it to the control module;

The control module is further configured to control the motor winding mode and operating frequency of the air conditioner compressor according to the comparison result of the frequency comparison module, and then continuously control the operation of the air conditioner compressor according to the comparison result of the time comparison module frequency.
The device according to claim 6, further comprising:

The wind speed comparison module is configured to compare the windshield wind speed of the outdoor unit of the air conditioner with a preset wind speed, obtain a comparison result, and send it to the control module;

The control module corrects the target frequency f according to the comparison result of the wind speed comparison module.
The device according to claim 7, further comprising:

The real-time detection module is configured to detect the operating frequency, operating time, windshield wind speed and outdoor ambient temperature of the air-conditioning compressor in real time, and send the detected outdoor ambient temperature to the calculation module, and the detected air-conditioning compressor The operating frequency of the air conditioner is sent to the frequency comparison module, the detected operating time of the air conditioner compressor is sent to the time comparison module, and the detected windshield wind speed of the air conditioner compressor is sent to the wind speed comparison module. Module.
The device according to claim 5, wherein the control module is further configured to control the motor to select the first winding mode and run the air conditioner frequency in the first winding mode if the target frequency f is greater than the winding demarcation point frequency f4 To the winding demarcation point frequency f4; after the air conditioner frequency reaches the winding demarcation point frequency f4, control the motor to select the second winding mode and run the air conditioner frequency to the target frequency f in the second winding mode; when the air conditioning frequency is from the winding demarcation point When the frequency f4 runs to the target frequency f, the oil return pause platform is inserted.
An inverter air conditioner, characterized by comprising the device according to any one of claims 5 to 9.