Control method and control device of variable frequency air conditioner and variable frequency air conditioner

[0031] In order to understand the features and technical contents 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 with reference to the accompanying drawings, which are for reference only and are not intended to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, numerous details are provided 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.

[0032] see in combination figure 1 As shown, an embodiment of the present disclosure provides a control method for an inverter air conditioner, including:

[0033] S1, determine the target frequency f of the air conditioner operation according to the outdoor ambient temperature Tao;

[0034] Optionally, for example, the cooling mode can be selected to be turned on, and 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 .

[0035] S2, judging the relationship between the target frequency f and the frequency f4 of the winding boundary point of the motor of the air-conditioning compressor, and controlling the motor winding mode and operating frequency of the air-conditioning compressor according to the comparison result of the frequency comparison module, and adjusting the frequency In the process of , if the air conditioner frequency can be directly adjusted to the target frequency f without passing through the winding boundary frequency f4, the oil return stop platform is inserted twice during the process of adjusting the air conditioner frequency to the target frequency f.

[0036] In the embodiment 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 target frequency f of the air conditioner operation is calculated by the calculation module according to the outdoor ambient temperature Tao, and then the target frequency f and the winding boundary are determined by the judgment module. The relationship between the point frequencies f4 is determined, and the judgment result is sent to the control module 10, which 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.

[0037] When using this control method to control the inverter air conditioner, the relationship between the target frequency f and the winding boundary point frequency f4 can be combined with the switching of the winding mode of the coil, and according to the relationship between the target frequency f and the winding boundary point 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. Precise control to improve the operating energy efficiency of the air conditioner. At the same time, because the oil return stop platform is inserted in the air conditioner frequency conversion process, the air conditioner can be controlled to return oil during the air conditioner frequency conversion process, so as to avoid the compressor damage caused by insufficient oil return during the air conditioner frequency conversion process, and form an effective protection for the compressor operation.

[0038] The above-mentioned winding boundary point frequency f4 can be set by the user according to the actual motor parameters, or can be directly determined by calculation by the controller or the like.

[0039] 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.

[0040] The above-mentioned operating state of the air conditioner may be cooling or heating.

[0041] In the process of frequency adjustment, if the air conditioner frequency can be directly adjusted to the target frequency f without passing through the winding boundary frequency f4, the steps of inserting the oil return stop platform twice during the process of adjusting the air conditioner frequency to the target frequency f include: The frequency f is less than or equal to the frequency f4 of the winding boundary point, control the motor to select the first winding mode, and run the air conditioner frequency to the target frequency f in the first winding mode; insert two loops in the process of running the air conditioner frequency to the target frequency f. Oil standstill platform.

[0042] The step of inserting the oil return stop platform twice in the process of running the operating air conditioner frequency to the target frequency f includes: during the operation process of the air conditioner, running the operating air conditioner frequency to the first frequency f1 at the first frequency modulation speed V1, and entering the first cycle The oil stop platform lasts for t1 time; after the first oil return stop platform ends, the operating air conditioner frequency is run to the second frequency f2 at the second frequency modulation speed V2, and enters the second oil return stop platform and lasts for t2 time; in the second oil return stop platform After the oil return stop platform is over, the operating air conditioner frequency is operated to the target frequency f at the third frequency modulation speed V3.

[0043]In the process of determining the motor winding mode of the air conditioner and the oil return pause strategy, if f is less than or equal to f4, first select the first winding mode and make the air conditioner compressor run to the first oil return pause platform for the first pause time t1. After the first pause time, the air conditioner compressor is operated to the second oil return pause platform for the second pause time t2; after the second pause time, the air conditioner compressor is operated to the target frequency f, wherein the air conditioner compressor is set The motor windings are the first winding with larger impedance and the second winding with smaller impedance, set the winding boundary frequency f4 of the first winding and the second winding, the frequency of the first oil return stop platform is f1, the first The frequency of the second oil return platform is f2, and both f1 and f2 are less than f4.

[0044] Specifically, set the winding mode of the motor to be star type and delta type, set the frequency f4 of the boundary point, set the frequency f4 of the boundary point of winding switching to 65Hz (which can be adjusted according to the parameters of the motor winding), and switch the frequency through the winding switching part. Describe the winding structure of the motor, so that it can choose star or delta connection mode, and set the first frequency of the first oil return pause platform as f1 (adjustable at 35Hz) and the time as the first pause time t1 (adjustable at 1min); second The second frequency of the oil return pause platform is f2 (45Hz adjustable) and the time is the second pause time t2 (1min adjustable).

[0045] like figure 2 As shown, 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 windshield of the outdoor fan of the air conditioner r≤r1, the target frequency is corrected in a negative direction; when r >r2 target frequency positive correction, where r1 and r2 are preset wind speed values.

[0046] When the outdoor unit of the air conditioner 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 outdoor fan of the air conditioner; when the wind speed of the windshield of the outdoor fan of the air conditioner r≤r1, the target frequency is corrected negatively , to prevent condensation or freezing; when r1 r2, the target frequency is corrected positively to prevent excessive superheat and reduce the capacity output of the evaporator.

[0047] Optionally, when there is a windshield in the outdoor unit of the air conditioner, f=F*K+c, 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 c is the frequency correction value, 0 < 1.

[0048] For example, take K=0.5, and set the outdoor fan damper to be silent, low wind, medium wind, high wind, and strong, and the corresponding speed r is 500rpm, 800rpm, 1200rpm, 1500rpm, 1700rpm (rpm is the abbreviation of Revolutions Per minute, it is revolutions per minute.); the preset wind speed values ​​r1 are 900rpm and r2 are 1500rpm.

[0049] According to f=F*K+c, c is determined according to the current wind speed of the windshield of the outdoor fan, and f is calculated, and then in step S2, if it is determined that f is less than or equal to f4, the star winding mode is selected, and the frequency of the air-conditioning compressor is controlled to adjust to the target Frequency f, in this process, the frequency modulation speed of the air conditioner compressor can run to the target frequency f according to 0.5Hz/s. On the contrary, 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 0.5Hz/s to the winding dividing point frequency f4. At this moment, the control is switched to the delta winding connection, and the The air conditioner compressor is frequency-modulated to the target frequency f. During this process, you can choose to adjust the frequency at a constant speed or to the target frequency.

[0050] Optionally, in step S2, the motor and the air-conditioning compressor are connected through a winding switching part, and the winding switching part is used to switch the winding structure of the motor, and control is performed according to the results of judging the magnitudes of f and f4. The winding switching unit switches operations.

[0051] The motor is a three-phase motor having three-phase windings of U-phase, V-phase, and W-phase, and 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 a star winding connection as the first winding method or a delta winding connection as the second winding method.

[0052] Optionally, when the outdoor unit of the air conditioner has no windshield, that is, the silent mode, 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 outdoor ambient temperature, 0

[0053] For example, take K=0.5, and set the rotation speed r=500rpm when the outdoor fan is silent (rpm is the abbreviation of RevolutionsPer minute, which is revolutions per minute).

[0054] According to f=F*K, determine the target frequency f, here F=100Hz, K is 0.5, f is 50HZ, and then it is judged in step S2 that f is less than f4, then select the star winding mode, and control the air conditioner compressor to adjust the frequency to The target frequency f, in this process, the frequency modulation speed of the air conditioner compressor can run to the target frequency f according to 0.5Hz/s. On the contrary, 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 0.5Hz/s to the winding dividing point frequency f4. At this moment, the control is switched to the delta winding connection, and the The air conditioner compressor is frequency-modulated to the target frequency f. During this process, you can choose to adjust the frequency at a constant speed or to the target frequency.

[0055] Embodiments of the present disclosure provide a control device for an inverter air conditioner.

[0056] see in combination image 3 As shown, in some embodiments, the control device of the inverter air conditioner includes:

[0057] The calculation module 10 is configured to determine the target frequency f of the air conditioner operation according to the outdoor ambient temperature Tao;

[0058] The judgment module 20 is configured to judge the relationship between the target frequency f and the winding boundary point frequency f4;

[0059] The control module 30 is configured to determine the motor winding mode of the air conditioner according to the relationship between the target frequency f and the winding boundary point frequency f4 determined by the judgment module.

[0060] In this embodiment, the calculation module 10 calculates the target frequency f according to 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 The result is that f is less than f4, control the air-conditioning compressor to select the first winding mode of the motor and make the air-conditioning compressor run to the target frequency f, and insert two oil return pause platforms during this process. 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 (star winding mode) of the motor, make the air conditioner compressor run to the winding dividing point frequency f4, switch to the second winding mode wiring (delta winding mode), and make the air conditioner compressor operate. Run to target frequency f.

[0061] In this embodiment, according to the judgment result of the judgment module 20, the control module 30 first selects the first winding mode and makes the air conditioner compressor run to the first oil return stop platform for the first stop time t1. After the first pause time, the air conditioner compressor is operated to the second oil return pause platform for the second pause time t2; after the second pause time, the air conditioner compressor is operated to the target frequency f.

[0062] like Figure 4 As shown, in some embodiments, the apparatus further includes:

[0063] The frequency comparison module 40 is configured to compare the operating frequency of the air conditioner compressor with the winding boundary point frequency f4, obtain a comparison result, and send it to the control module 30;

[0064] The control module 30 controls the motor winding mode and operating frequency of the air conditioner compressor according to the received comparison result of the frequency comparison module 40, and continuously controls the operation frequency of the air conditioner compressor.

[0065] In this embodiment, after the judging module 20 judges the magnitudes 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 results. 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 operation frequency of the air conditioner compressor to run to the target frequency value.

[0066] like Figure 4 As shown, in some embodiments, the apparatus further includes:

[0067] The wind speed comparison module 50 is configured to compare the wind speed of the windshield of the outdoor unit of the air conditioner with the preset wind speed, obtain the comparison result, and send it to the control module 30;

[0068] The control module 30 corrects the target frequency f according to the comparison result of the wind speed comparison module 50 .

[0069] In this embodiment, on the basis of the above-mentioned frequency comparison module 40 , the comparison result obtained by the wind speed comparison module 50 can also be sent to the control module 30 , and the control module 30 can send the comparison result according to the wind speed comparison module 50 . To correct the target frequency, 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 operating frequency runs to the target frequency value.

[0070] like Figure 5 As shown, in some embodiments, the apparatus further includes:

[0071] The real-time detection module 60 is configured to detect the operating frequency of the air conditioner compressor, the wind speed of the windshield and the outdoor ambient temperature 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 wind speed of the windshield of the air conditioner compressor is sent to the wind speed comparison module 50 respectively.

[0072] In this embodiment, the above-mentioned frequency comparison module 40 and wind speed comparison module 50 can obtain corresponding parameters by detecting the operating frequency and wind speed of the air conditioner compressor in real time through the real-time detection module 60, and the calculation module 10 can also obtain the corresponding parameters through the real-time detection module 60 Obtain the corresponding parameters from the outdoor ambient temperature detected in real time.

[0073] like Image 6 As shown, 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.

[0074] 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 of the target frequency f has been described in the embodiment of the above method. This will not go into details.

[0075] Embodiments of the present disclosure provide an inverter air conditioner.

[0076] Embodiments of the present disclosure further provide an inverter air conditioner, including the above control device.

[0077] Embodiments of the present disclosure also provide an inverter air conditioner, including: at least one processor; and

[0078] A memory connected in communication with the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and when the instructions are executed by the at least one processor, the at least one processor executes the above-mentioned control method.

[0079] Embodiments of the present disclosure further provide a computer-readable storage medium storing computer-executable instructions, where the computer-executable instructions are configured to execute the above control method.

[0080]Embodiments of the present disclosure also provide a computer program product, where the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, and when the program instructions are executed by a computer, causes The computer executes the above-described control method.

[0081] The above-mentioned computer-readable storage medium may be a transient computer-readable storage medium, and may also be a non-transitory computer-readable storage medium.

[0082] The embodiments of the present disclosure also provide an electronic device, the structure of which is as follows Figure 7 shown, the electronic equipment includes:

[0083] at least one processor (processor) 100, image 3 A processor 100 is taken as an example; and a memory (memory) 101 may also include a communication interface (Communication Interface) 102 and a bus 103. 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 may invoke the logic instructions in the memory 101 to execute the control methods of the above embodiments.

[0084] In addition, the above-mentioned logic instructions in the memory 101 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0085] 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 the software programs, instructions, and modules stored in the memory 101 , that is, to implement the control methods in the above method embodiments.

[0086] The memory 101 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 101 may include high-speed random access memory, and may also include non-volatile memory.

[0087] The technical solutions of the embodiments of the present disclosure may be embodied in the form of software products, and the computer software products are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods described in the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: U disk, removable hard disk, read-only memory (ROM, Read-Onl Memor), random access memory (RAM, Random Access Memor), magnetic disk or A variety of media that can store program codes, such as an optical disc, can also be a temporary storage medium.

[0088] The foregoing description and drawings sufficiently 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 examples are only representative of possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of the disclosed embodiments includes the full scope of the claims, along with 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. For example, without changing the meaning of the description, a first element could be termed a second element, and similarly, a second element could be termed a first element, so long as all occurrences of "the first element" were consistently renamed and all occurrences of "the first element" were named consistently The "second element" can be renamed consistently. The first element and the second element are both elements, but may not be the same element. Also, the terms used in this application are used to describe the embodiments only and not to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a" (a), "an" (an) and "the" (the) are intended to include the plural forms as well, unless the context clearly dictates 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 listings. Additionally, when used in this application, the term "comprise" and its variations "comprises" and/or including and/or the like 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 limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, reference may be made to the description of the method section for relevant parts.

[0089] Those skilled in the art can realize that the units and algorithm steps of each example 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 in hardware or software may depend on the specific application and design constraints of the technical solution. Skilled artisans may use different methods for implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the disclosed embodiments. The skilled person can clearly understand that, for the convenience and brevity of the description, for the specific working process of the above-described systems, devices and units, reference may be made to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

[0090] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to apparatuses, devices, etc.) may be implemented in other ways. For example, the apparatus 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 Either it can be integrated into another system, or some features can be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. This embodiment may be implemented by selecting some or all of the units according to actual needs. In addition, each functional unit in the embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

[0091] 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 present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code that contains one or more functions for implementing the specified logical function(s) executable instructions. In some alternative implementations, the functions noted in the blocks may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented in special purpose hardware-based systems that perform the specified functions or actions, or special purpose hardware implemented in combination with computer instructions.