Compressor starting control method and device, variable frequency air conditioner and storage medium

Abstract

The invention relates to the technical field of compressors, and discloses a compressor starting control method which comprises the following steps: in response to a compressor starting instruction, injecting current to drag a rotor to operate; in the first current stage, a first angle of a compressor rotor is obtained; in the second current stage, a second angle of the compressor rotor is obtained; under the condition that the difference value between the first angle and the second angle is smaller than or equal to a difference value threshold value, switching to a closed-loop control stage for operation; wherein the first current stage and the second current stage belong to open-loop control stages. And a compressor starting instruction is received, current is directly injected to drag the rotor to operate, and meanwhile rotor positioning is carried out to determine the opportunity of switching to enter the closed-loop control stage. Therefore, the rotor is positioned in the open-loop dragging process, so that the starting time of the compressor is shortened, and meanwhile, the open-loop dragging stage is kept, and the loading capacity is guaranteed. The invention further discloses a device for compressor starting control, the variable frequency air conditioner and a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of compressors, for example, to a method, a device, a variable frequency air conditioner and a storage medium for compressor startup control. Background Art

[0002] In variable frequency air conditioners, the common compressor startup control method mainly includes three processes: rotor positioning process, open-loop startup process and closed-loop startup process. After power-on startup, the motor rotor of the compressor is first positioned within a specific time, and the rotor is positioned to the zero position; after positioning is completed, the motor rotor is dragged at a constant speed or from zero speed to reach a certain speed; finally, it switches from open loop to closed loop operation. This method takes a lot of time in the positioning and dragging stages, resulting in a long startup time.

[0003] In order to shorten the startup time of the compressor, a method for compressor startup control is provided in the related art, including: realizing rotor position estimation during the stationary phase of the compressor, and directly starting in a closed loop after the rotor position is determined.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] Although the startup time of the compressor is shortened, the load-carrying capacity of the compressor is weakened due to the lack of the dragging stage.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a method, an apparatus, a variable frequency air conditioner and a storage medium for compressor startup control, so as to shorten the startup time of the compressor while ensuring the load capacity of the compressor startup.

[0009] In some embodiments, the method includes: in response to a compressor start command, injecting current to drive the rotor to operate; in a first current stage, obtaining a first angle of the compressor rotor; in a second current stage, obtaining a second angle of the compressor rotor; when the difference between the first angle and the second angle is less than or equal to a difference threshold, switching to a closed-loop control stage; wherein the first current stage and the second current stage both belong to an open-loop control stage.

[0010] Optionally, the first current stage is a rising stage in which the current continues to increase when the current injection starts, and the second current stage is a dragging stage in which the rotor is dragged to accelerate after the rising stage.

[0011] Optionally, obtaining the second angle of the compressor rotor includes: within a first preset time period, at set time intervals, locating the position of the compressor rotor to obtain the second angle.

[0012] Optionally, in response to a compressor start command, injecting current to drag the rotor to operate includes: in response to the compressor start command, determining a target angle of the compressor rotor to be 0; and dragging the rotor to operate according to the target angle of the compressor rotor.

[0013] Optionally, after obtaining the second angle of the rotor, it also includes: when the difference between the first angle and the second angle is greater than a difference threshold, obtaining the current speed of the compressor rotor; when the current speed of the compressor rotor is less than the first speed threshold, issuing a loss of step warning.

[0014] Optionally, after obtaining the current rotational speed of the rotor, the method further includes: when the current rotational speed of the compressor rotor is greater than or equal to a first rotational speed threshold, switching into closed-loop startup.

[0015] Optionally, in response to the compressor start command, after injecting current to drive the rotor to run, it also includes: obtaining the rotational speed of the compressor rotor; when the rotational speed of the compressor rotor reaches a second rotational speed threshold, controlling the compressor to switch to a closed-loop control stage.

[0016] Optionally, the compressor further includes a current analysis module, and the method further includes: monitoring the internal current condition of the compressor through the current analysis module; and controlling the compressor to shut down when an overcurrent fault occurs inside the compressor.

[0017] In some embodiments, the device includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned device for compressor startup control when running the program instructions.

[0018] In some embodiments, the variable frequency air conditioner includes: a variable frequency air conditioner body; and the above-mentioned device for compressor startup control is installed on the variable frequency air conditioner body.

[0019] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, the above-mentioned method for compressor startup control is executed.

[0020] The method, device, variable frequency air conditioner and storage medium for compressor startup control provided by the embodiments of the present disclosure can achieve the following technical effects:

[0021] The startup process of the compressor is divided into two parts: an open-loop control stage and a closed-loop control stage. After receiving the compressor startup command, it directly enters the open-loop dragging stage, and injects current to drag the compressor rotor to run. In the first current stage and the second current stage, the angles of the compressor rotor are detected respectively to obtain the first angle and the second angle. If the first angle and the second angle meet the requirement that the difference is less than the difference threshold, it means that the positioning of the rotor position is relatively accurate. At this time, it can be switched to the closed-loop control stage for closed-loop startup. In this way, the rotor position is positioned simultaneously during the open-loop dragging process, which is conducive to shortening the startup time of the compressor, while retaining the open-loop dragging stage and ensuring the load-carrying capacity of the compressor startup.

[0022] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0024] Figure 1 is a schematic diagram of a method for compressor startup control provided by an embodiment of the present disclosure;

[0025] Figure 2 is a schematic diagram of a compressor startup phase provided by an embodiment of the present disclosure;

[0026] Figure 3 is a schematic diagram of a logic algorithm for compressor rotor positioning provided by an embodiment of the present disclosure;

[0027] Figure 4 is a schematic diagram of another logic algorithm for compressor rotor positioning provided by an embodiment of the present disclosure;

[0028] Figure 5 is a schematic diagram of another method for compressor startup control provided by an embodiment of the present disclosure;

[0029] Figure 6 is a schematic diagram of a device for compressor startup control provided by an embodiment of the present disclosure;

[0030] Figure 7 It is a schematic diagram of a variable frequency air conditioner provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to be able 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 is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Unless otherwise stated, the term "plurality" means two or more.

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0035] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0036] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0037] In variable frequency air conditioners, the common compressor startup control method mainly includes three processes: rotor positioning process, open-loop startup process and closed-loop startup process. After power-on startup, the motor rotor of the compressor is first positioned within a specific time, and the rotor is positioned to the zero position; after positioning is completed, the motor rotor is dragged at a constant speed or from zero speed to reach a certain speed; finally, it switches from open loop to closed loop operation. This method takes a lot of time in the positioning and dragging stages, resulting in a long startup time.

[0038] In order to shorten the startup time of the compressor, a method for compressor startup control is provided in the related art, including: realizing rotor position estimation during the compressor stationary phase, and directly starting in a closed loop after the rotor position is determined. However, although this method shortens the startup time of the compressor, the load-carrying capacity of the compressor startup is weakened due to the lack of the drag phase.

[0039] Combination Figure 1As shown, the embodiment of the present disclosure provides a method for compressor startup control.

[0040] S101, the processor injects current to drive the rotor to operate in response to a compressor start instruction.

[0041] S102: In a first current phase, the processor obtains a first angle of the compressor rotor.

[0042] S103, in the second current stage, the processor obtains a second angle of the compressor rotor. The first current stage and the second current stage both belong to the open-loop control stage.

[0043] S104: When the difference between the first angle and the second angle is less than or equal to the difference threshold, switching to the closed-loop control stage.

[0044] By adopting the method for compressor startup control provided by the embodiment of the present disclosure, the startup process of the compressor is divided into two parts: an open-loop control stage and a closed-loop control stage. After receiving the compressor startup command, it directly enters the open-loop dragging stage, and injects current to drag the compressor rotor to operate. In the first current stage and the second current stage, the angles of the compressor rotor are detected respectively to obtain the first angle and the second angle. If the first angle and the second angle meet the requirement that the difference is less than the difference threshold, it means that the positioning of the rotor position is relatively accurate. At this time, it can be switched to the closed-loop control stage for closed-loop startup. In this way, the rotor position is positioned simultaneously during the open-loop dragging process, which is conducive to shortening the startup time of the compressor, while retaining the open-loop dragging stage and ensuring the load-carrying capacity of the compressor startup.

[0045] Optionally, the first current stage is a rising stage in which the current continues to increase when the current injection starts, and the second current stage is a dragging stage in which the rotor is dragged to accelerate after the rising stage.

[0046] The method for compressor startup control provided by the embodiment of the present disclosure can be divided into two processes and three stages. Figure 2 As shown, starting from the beginning of current injection, the startup process is divided into one stage, two stages and three stages. Among them, the first stage is the rising stage when the current continues to increase when the current injection begins, that is, the first current stage mentioned above. The second stage corresponds to the second current stage mentioned above, which is the dragging stage after the current rises, dragging the compressor rotor to accelerate until the rotor speed reaches the open-loop starting speed. The first and second stages belong to the open-loop control stage, that is, the open-loop dragging process. The third stage corresponds to the closed-loop control stage, that is, the closed-loop startup process.

[0047] The open-loop starting speed is the preset maximum speed of the rotor acceleration. The open-loop starting speed has a value range of 5 Hz to 30 Hz. For example, it is 10 Hz, 15 Hz, 20 Hz, etc. In this way, it can avoid excessive noise during the compressor startup process caused by too high rotor speed.

[0048] Optionally, in response to the compressor start command, injecting current to drive the rotor to run includes: in response to the compressor start command, the processor determines that the target angle of the compressor rotor is 0, and drives the rotor to run according to the target angle of the compressor rotor. Figure 3 As shown, when a compressor start command is received, the Id current command is 0, and a current is added to the Iq axis to open the loop and drive the current to rise, so that the compressor rotor rotates to the zero position within a set time. The set time is, for example, 0.5 seconds.

[0049] Combination Figure 3 As shown, the processor obtains the first angle of the compressor rotor, including: injecting high-frequency current on the α and β axes after the current loop, and converting the voltage command value U α and U β Input to SVPWM (Space Vector Pulse-Width-Modulation). The feedback current signal is analyzed in the single resistor current sampling, and the angle is identified after bandpass filtering to obtain the first angle of the compressor rotor.

[0050] Furthermore, the processor performs angle identification to obtain a first angle of the compressor rotor, including: the processor determines the first angle of the compressor rotor according to the high-frequency current and the high-frequency voltage equation of the motor.

[0051] The high frequency current is

[0052]

[0053] The high-frequency voltage equation of the motor is

[0054]

[0055] Among them, u α 、u β are the high frequency voltages in the α and β axes, L m is the common mode inductance of the compressor stator, L n is the differential mode inductance of the compressor stator.

[0056] At the same time, due to the salient polarity characteristics of the motor, L m =(L d +L q ) / 2; L n =(L d -L q) / 2.

[0057] Among them, L d is the d-axis inductance, L q is the q-axis inductance, and θ is the first angle of the compressor rotor.

[0058] The first angle θ of the compressor rotor can be determined based on the high-frequency current and the high-frequency voltage equation of the motor.

[0059] The identification process of the second angle may be performed in the same manner as the identification process of the first angle.

[0060] Optionally, the difference threshold may be a preset fixed threshold, which is set according to actual application requirements. Alternatively, the processor determines the difference threshold according to the first angle.

[0061] More specifically, the processor determines the difference threshold according to the first angle, including: the processor determines the difference threshold as the product of the first angle and a set ratio. The set ratio may be 20%. In this way, the difference threshold changes accordingly with the change of the first angle, adapts to the actual operation situation, and has higher accuracy.

[0062] Optionally, the processor obtains the second angle of the compressor rotor including: locating the compressor rotor position at every set time interval within a first preset time length to obtain the second angle. The first preset time length is greater than the set time interval and can be set to an integer multiple of the time interval. In this way, within the first preset time length, multiple second angles can be obtained, and the second angles are compared with the first angle one by one until the difference between the two satisfies a difference threshold value that is less than or equal to a preset difference threshold value.

[0063] Optionally, after the processor responds to the compressor start instruction and injects current to drive the rotor to run, it also includes: the processor monitors the speed of the compressor rotor, and when the speed of the compressor rotor reaches a second speed threshold, the processor controls the compressor to switch to a closed-loop control stage.

[0064] Among them, the second speed threshold is the open-loop startup speed pre-set in the algorithm. The open-loop startup speed is the maximum speed in the rotor acceleration phase. Hertz can represent the number of times the rotor rotates per second, and here Hertz is used to represent the speed of the compressor rotor. In this case, exemplarily, the value range of the second speed threshold is 5Hz to 30Hz, including 10Hz, 15Hz, 20Hz, etc. Among them, the second speed threshold is preferably 10Hz. Setting the second speed threshold in this way can avoid excessive noise caused by excessive rotor speed when the compressor starts.

[0065] Generally, during the rotor acceleration process, a second angle can be measured whose difference with the first angle is less than the difference threshold. If the conditions are still not met after the entire rotor acceleration process, it will directly switch to the closed-loop control stage to avoid a long startup time. At this time, the speed of the compressor rotor is already high, and the allowable angle deviation is large. Even if the second angle fails to meet the set angle requirement, the correction of the identification angle can be completed in the closed-loop control stage. Therefore, directly entering the closed-loop control stage will not cause the compressor to lose step, which will lead to the failure of the compressor to start.

[0066] Combination Figure 4 As shown, optionally, after the compressor switches to the closed-loop control stage, the method for compressor startup control also includes: the processor identifies the compressor rotor angle based on the back electromotive force. The back electromotive force contains angle and speed information, so the position of the rotor can be observed based on the back electromotive force. Specifically, taking the actual system as a reference and establishing a state observation model based on the actual system, the control quantity or parameter of the observation model is corrected by observing the deviation between the state and the actual state and combining a certain control law, so that the observed state follows the actual state, and the estimated value of the back electromotive force or magnetic flux can be obtained, thereby extracting the motor rotor position and speed.

[0067] Continue to combine Figure 4 As shown, after the processor identifies the compressor rotor angle based on the back electromotive force, the obtained compressor rotor angle is input into the algorithm again to achieve closed-loop control, thereby continuously correcting the rotor angle and reducing the error of rotor angle identification.

[0068] Combination Figure 5 As shown, the embodiment of the present disclosure provides another method for compressor startup control, comprising:

[0069] S501: The processor injects current to drive the rotor to operate in response to a compressor start instruction.

[0070] S502: In a first current phase, the processor obtains a first angle of the compressor rotor.

[0071] S503, in the second current stage, the processor obtains a second angle of the compressor rotor. The first current stage and the second current stage both belong to the open-loop control stage.

[0072] S504: The processor determines whether the difference between the first angle and the second angle is less than or equal to a difference threshold.

[0073] If yes, execute step S505; if no, execute step S506.

[0074] S505, the processor controls the compressor to switch to the closed-loop control stage.

[0075] S506: The processor obtains the current rotation speed of the compressor rotor.

[0076] S507: The processor determines whether the current rotation speed of the compressor rotor is less than a first rotation speed threshold.

[0077] If yes, execute step S508; if no, execute step S509.

[0078] S508: The processor issues a step-out warning.

[0079] S509, the processor controls the compressor to switch to the closed-loop control stage.

[0080] If the closed-loop control stage is forced to start when the error is large, the startup will be out of step. That is, when the rotor angle is detected in the closed-loop control stage, the detected rotor angle deviation exceeds the limit value. When the compressor rotor speed is high, the allowable out-of-step deviation is large, and the rotor detection angle deviation can be corrected in the closed-loop control stage. When the compressor rotor speed is low, the angle deviation is difficult to be effectively corrected in the closed-loop control stage.

[0081] Therefore, when the current speed of the compressor rotor is less than the first speed threshold, a step-out warning is issued and the closed-loop control stage is not allowed to be entered to avoid step-out. When the current speed of the compressor rotor is greater than or equal to the first speed threshold, the closed-loop control stage can be directly entered. At this time, the deviation of the rotor angle can be corrected in the closed-loop control stage, which can shorten the startup time of the compressor to a greater extent.

[0082] Optionally, after the processor issues a step-out warning, the processor continues to execute step S503, and in the second current stage, the processor obtains a second angle of the compressor rotor. The second angle is updated, and the first angle and the second angle are compared again until the difference between the two is less than the difference threshold, or the speed of the compressor rotor reaches the first speed threshold.

[0083] Hertz can represent the number of times the rotor rotates per second. Here Hertz is used to represent the speed of the compressor rotor.

[0084] Optionally, the first speed threshold is determined in a manner including: the processor determines the first speed threshold to be a preset fixed speed. Exemplarily, the first speed threshold may be 5 Hz.

[0085] Optionally, the first speed threshold is determined by: the processor determines the first speed threshold according to the open-loop startup speed preset in the algorithm. The open-loop startup speed is the highest speed in the rotor acceleration phase. More specifically, the first speed threshold can be set as a set ratio of the first speed threshold. In this way, different first speed thresholds are set according to different open-loop speeds, so that the first speed threshold is adapted to the actual situation of the current compressor and more accurately reflects the operation of the compressor rotor.

[0086] Optionally, the ratio is set to 40% to 60%, for example, 50%. That is, when the open-loop starting speed is 10 Hz, the first speed threshold can be set to 5 Hz.

[0087] Optionally, in step S509, after the processor controls the compressor to switch to the closed-loop control stage, the method for compressor startup control further includes: in the case of compressor out of step, controlling the compressor to stop, and restarting the startup step again after 3 minutes. That is, after 3 minutes, injecting current again to drive the rotor to run.

[0088] Optionally, the compressor further includes a current analysis module. Specifically, the current analysis module is a single resistor sampling current analysis module.

[0089] Optionally, the method for compressor startup control further includes: detecting the current condition inside the compressor through a current analysis module; and controlling the compressor to stop when an overcurrent fault occurs inside the compressor. In this way, the overcurrent fault can be monitored in time during the startup process to avoid damage to the compressor.

[0090] Combination Figure 6 As shown, the embodiment of the present disclosure provides a device for compressor startup control, including a processor (processor) 60 and a memory (memory) 61. Optionally, the device may also include a communication interface (CommunicationInterface) 62 and a bus 63. Among them, the processor 60, the communication interface 62, and the memory 61 can communicate with each other through the bus 63. The communication interface 62 can be used for information transmission. The processor 60 can call the logic instructions in the memory 61 to execute the method for compressor startup control of the above embodiment.

[0091] In addition, the logic instructions in the above-mentioned memory 61 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.

[0092] The memory 61 is a storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 60 executes the function application and data processing by running the program instructions / modules stored in the memory 61, that is, the method for compressor startup control in the above embodiment is implemented.

[0093] The memory 61 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 61 may include a high-speed random access memory and may also include a non-volatile memory.

[0094] Combination Figure 7 As shown, the embodiment of the present disclosure provides a variable frequency air conditioner 100, including: a variable frequency air conditioner body, and the above-mentioned device 200 for compressor startup control, which is installed on the variable frequency air conditioner body. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. It can be understood by those skilled in the art that the device 200 for compressor startup control can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0095] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for compressor startup control.

[0096] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0097] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0098] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words 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 the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, 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 part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0099] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in 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. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0100] 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 schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be 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 may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0101] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for compressor startup control, characterized in that: include: In response to a compressor start command, injecting current to drive the rotor to operate; In a first current phase, obtaining a first angle of the compressor rotor; In a second current phase, a second angle of the compressor rotor is obtained; When the difference between the first angle and the second angle is less than or equal to the difference threshold, switching to the closed-loop control stage; Among them, the first current stage and the second current stage both belong to the open-loop control stage.

2. The method according to claim 1, characterized in that The first current stage is a rising stage in which the current continues to increase when the current injection starts, and the second current stage is a dragging stage in which the rotor is dragged to accelerate after the rising stage.

3. The method according to claim 2, characterized in that Obtaining the second angle of the compressor rotor includes: During the first preset time period, the compressor rotor position is located at every set time interval to obtain a second angle.

4. The method according to claim 1, characterized in that In response to a compressor start command, injecting current to drive the rotor to operate includes: In response to a compressor start command, determining a target angle of the compressor rotor to be 0; The rotor is dragged to operate according to the target angle of the compressor rotor.

5. The method according to claim 1, characterized in that After obtaining the second angle of the rotor, the method further includes: When the difference between the first angle and the second angle is greater than a difference threshold, obtaining a current rotation speed of the compressor rotor; When the current rotation speed of the compressor rotor is less than the first rotation speed threshold, a step-out warning is issued.

6. The method according to claim 5, characterized in that After obtaining the current speed of the rotor, it also includes: When the current rotation speed of the compressor rotor is greater than or equal to the first rotation speed threshold, closed-loop startup is performed.

7. The method according to any one of claims 1 to 6, characterized in that: The compressor further includes a current analysis module, and the method further includes: Monitor the internal current of the compressor through the current analysis module; In the event of an overcurrent fault inside the compressor, the compressor is controlled to shut down.

8. A device for compressor startup control, characterized in that: The system comprises a processor and a memory storing program instructions, wherein the processor is configured to execute the method for compressor startup control according to any one of claims 1 to 7 when running the program instructions.

9. A variable frequency air conditioner, characterized in that: include: Inverter air conditioner body; The device for compressor startup control as claimed in claim 8 is installed on the variable frequency air conditioner body.

10. A storage medium storing program instructions, characterized in that: When the program instructions are executed, the method for compressor startup control according to any one of claims 1 to 7 is executed.

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