Control method and device of air conditioning unit and computer readable storage medium

Abstract

The invention provides a control method and device of an air conditioning unit and a computer readable storage medium. The method comprises the steps that under the condition that a shutdown instruction of the air conditioning unit is received, the operation mode of the air conditioning unit is determined, the opening degree of electronic expansion valves of the air conditioning unit is adjusted to the preset opening degree according to the operation mode, and the electronic expansion valves comprise the heating electronic expansion valve and the indoor unit electronic expansion valve; after the opening degree of the electronic expansion valve is adjusted to the preset opening degree, the pressure difference value of the air conditioning unit is obtained, and the pressure difference value is the difference value between the pressure of a compressor exhaust port of the air conditioning unit and the pressure of an indoor unit inlet pipe; and controlling the air conditioning unit to be shut down under the condition that the pressure difference value is smaller than the preset difference value. Before the air conditioning unit is shut down every time, the opening degree of the electronic expansion valve is adjusted according to the operation mode of the air conditioning unit, so that the system pressure is balanced, and the problem that in the prior art, when the air conditioning unit has high pressure difference, loss of air conditioning components is accelerated due to direct shutdown is solved.

Description

Technical Field

[0001] The present application relates to the technical field of air-conditioning unit control, and in particular, to a control method and device for an air-conditioning unit, a computer-readable storage medium, and an air-conditioning unit. Background Art

[0002] The main working mode of the air conditioning unit is to compress the refrigerant through the compressor. The evaporation temperature of the refrigerant under high pressure is low, and the refrigeration is carried out by absorbing heat through the evaporation of the refrigerant. In order to ensure the operation effect of the air conditioner, the pipeline between the indoor and outdoor units needs to be completely sealed. Therefore, during the operation of the compressor, the pressure of the entire refrigeration system is different. The pressure at the exhaust of the compressor will be very high, while the pressure after throttling will be very low.

[0003] After the air-conditioning unit is controlled to shut down directly, as the external unit thermal electronic expansion valve and the indoor unit electronic expansion valve are directly closed, the pressure difference in the system will not return to the initial state as the unit is shut down. During the next unit startup, due to the pressure imbalance in the system, the unit startup process may cause damage to the strength of system components and accelerate the aging of components. Summary of the invention

[0004] The main purpose of the present application is to provide a control method, device, computer-readable storage medium and air-conditioning unit for an air-conditioning unit, so as to at least solve the problem in the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a control method for an air-conditioning unit is provided, comprising: upon receiving a shutdown command of the air-conditioning unit, determining the operating mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operating mode, wherein the electronic expansion valve comprises a heating electronic expansion valve and an indoor unit electronic expansion valve; after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure; and controlling the air-conditioning unit to shut down when it is determined that the pressure difference is less than the preset difference.

[0006] Optionally, the opening of the electronic expansion valve of the air-conditioning unit is adjusted to a preset opening according to the operating mode, including: when the operating mode is a cooling mode, controlling the opening of the heating electronic expansion valve of the air-conditioning unit to decrease to a first preset opening at a first preset rate, and controlling the opening of the indoor unit electronic expansion valve to be adjusted to a second preset opening; when the operating mode is a heating mode, controlling the opening of the heating electronic expansion valve of the air-conditioning unit to decrease to a third preset opening at a second preset rate, and controlling the opening of the indoor unit electronic expansion valve to decrease to a fourth preset opening at a third preset rate.

[0007] Optionally, the method further includes: upon receiving a start-up instruction of the air-conditioning unit, acquiring the pressure of the compressor exhaust port, and controlling the start-up of the air-conditioning unit at least according to the pressure of the compressor exhaust port.

[0008] Optionally, the air-conditioning unit is controlled to be turned on at least according to the compressor exhaust port pressure, including: obtaining the compressor exhaust temperature, and determining whether the compressor exhaust port pressure is greater than a preset pressure when determining that the compressor exhaust temperature is greater than or equal to a first preset temperature; when the compressor exhaust port pressure is greater than the preset pressure, adjusting the opening of the heating electronic expansion valve to a fifth preset opening, and continuing to detect the compressor exhaust port pressure until the compressor exhaust port pressure is less than or equal to the preset pressure, and then controlling the air-conditioning unit to be turned on.

[0009] Optionally, the air-conditioning unit is controlled to be turned on at least according to the compressor exhaust port pressure, including: obtaining the temperature of the oil temperature sensing bag, and determining whether the compressor exhaust port pressure is greater than the preset pressure when determining that the oil temperature sensing bag temperature is greater than or equal to a second preset temperature, wherein the oil temperature sensing bag is arranged at the bottom of the compressor; when the compressor exhaust port pressure is greater than the preset pressure, adjusting the opening of the electronic expansion valve to the first preset opening, and continuing to detect the compressor exhaust port pressure until the compressor exhaust port pressure is less than or equal to the preset pressure, controlling the air-conditioning unit to be turned on.

[0010] Optionally, after acquiring the compressor exhaust temperature, the method further includes: when it is determined that the compressor exhaust temperature is less than the first preset temperature, heating the compressor until the compressor exhaust temperature is greater than or equal to the first preset temperature.

[0011] Optionally, after the compressor exhaust pressure is less than or equal to the preset pressure, the method further includes: obtaining the indoor unit humidity of the air-conditioning unit, and determining whether the indoor unit humidity is less than the preset humidity; when it is determined that the indoor unit humidity is less than the preset humidity, controlling the air-conditioning unit to turn on.

[0012] According to another aspect of the present application, a control device for an air-conditioning unit is provided, comprising: an adjusting unit, for determining an operating mode of the air-conditioning unit upon receiving a shutdown command of the air-conditioning unit, and adjusting the opening of an electronic expansion valve of the air-conditioning unit to a preset opening according to the operating mode, wherein the electronic expansion valve comprises a heating electronic expansion valve and an indoor unit electronic expansion valve; an acquiring unit, for acquiring a pressure difference of the air-conditioning unit after adjusting the opening of the electronic expansion valve to the preset opening, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure; a first control unit, for controlling the air-conditioning unit to shut down when it is determined that the pressure difference is less than the preset difference.

[0013] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the control methods for the air-conditioning unit.

[0014] According to another aspect of the present application, an air-conditioning unit is provided, comprising: a controller for executing any one of the control methods for the air-conditioning unit.

[0015] By applying the technical solution of the present application, when receiving a shutdown command of the air-conditioning unit, the operation mode of the air-conditioning unit is determined, and the opening of the electronic expansion valve of the air-conditioning unit is adjusted to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve; after adjusting the opening of the electronic expansion valve to the preset opening, the pressure difference of the air-conditioning unit is obtained, wherein the pressure difference is the difference between the compressor exhaust port pressure of the air-conditioning unit and the indoor unit inlet pipe pressure; when it is determined that the pressure difference is less than the preset difference, the air-conditioning unit is controlled to shut down. By adjusting the opening of the electronic expansion valve according to the operation mode of the air-conditioning unit before shutting down each time to balance the system pressure, the problem of the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 A hardware structure block diagram of a mobile terminal for executing a control method for an air-conditioning unit provided in an embodiment of the present application is shown;

[0018] Figure 2A schematic flow chart of a control method for an air-conditioning unit provided according to an embodiment of the present application is shown;

[0019] Figure 3 A shutdown control flow chart of an air-conditioning unit in a cooling mode according to an embodiment of the present application is shown;

[0020] Figure 4 A shutdown control flow chart of an air conditioner unit in a heating mode according to an embodiment of the present application is shown;

[0021] Figure 5 A control flow chart before starting the air conditioning unit provided in an embodiment of the present application is shown;

[0022] Figure 6 A structural block diagram of a control device for an air-conditioning unit provided according to an embodiment of the present application is shown.

[0023] The above drawings include the following reference numerals:

[0024] 102, processor; 104, memory; 106, transmission device; 108, input and output devices. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] As introduced in the background technology, the prior art directly shuts down the air-conditioning unit when a high pressure difference exists, which accelerates the loss of air-conditioning components. In order to solve the problem that the prior art directly shuts down the air-conditioning unit when a high pressure difference exists, which accelerates the loss of air-conditioning components, the embodiments of the present application provide a control method and device for an air-conditioning unit, a computer-readable storage medium and an air-conditioning unit.

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 FIG. 1 is a hardware structure block diagram of a mobile terminal of a method for controlling an air conditioning unit according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is for illustration only and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0031] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the control method of the air conditioning unit in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The above-mentioned specific examples of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a control method for an air-conditioning unit running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0033] Figure 2 FIG. 1 is a flow chart of a control method for an air conditioning unit according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0034] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0035] Among them, the operating modes of the air-conditioning unit include cooling mode and heating mode. The opening of the electronic expansion valve is adjusted according to the different operating modes of the air-conditioning unit. This is more conducive to balancing the pressure between the indoor and outdoor units and avoiding the problem of loss of air-conditioning components.

[0036] Taking refrigeration as an example, when the compressor is close to full load and running stably, the exhaust pressure is generally in the range of 2.5-3MPa, and the suction pressure is generally in the range of 0.8-1.5Mpa. Under normal circumstances, after applying the shutdown command to the indoor unit, the outdoor unit first stops the operation of the compressor, and then the outdoor unit valve and the indoor unit valve are gradually reduced to 0. However, even if the compressor stops operating, since the system pipeline is sealed, after the outdoor unit valve and the indoor unit valve are reduced to 0, there is still a pressure difference in the pipeline from the indoor unit to the outdoor unit. During the next startup process, as the outdoor unit valve opens, the pressure difference in the pipeline is transmitted to the compressor as the electronic expansion valve opens. The compressor may be affected by the initial pressure difference during operation, which is not conducive to the normal operation of the compressor and will accelerate the mechanical damage of the compressor.

[0037] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0038] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0039] The preset difference may be set according to the safety conditions of the components of the air-conditioning unit. For example, the preset difference may be set to 0.1 MPa.

[0040] Through this embodiment, when a shutdown command of the air-conditioning unit is received, the operation mode of the air-conditioning unit is determined, and the opening of the electronic expansion valve of the air-conditioning unit is adjusted to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve; after adjusting the opening of the electronic expansion valve to the preset opening, the pressure difference of the air-conditioning unit is obtained, wherein the pressure difference is the difference between the compressor exhaust port pressure of the air-conditioning unit and the indoor unit inlet pipe pressure; when it is determined that the pressure difference is less than the preset difference, the air-conditioning unit is controlled to shut down. By adjusting the opening of the electronic expansion valve according to the operation mode of the air-conditioning unit before shutting down each time to balance the system pressure, the problem of the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components is solved.

[0041] During the specific implementation process, the opening of the electronic expansion valve of the air-conditioning unit is adjusted to a preset opening according to the above-mentioned operating mode, including: when the above-mentioned operating mode is a cooling mode, the opening of the heating electronic expansion valve of the air-conditioning unit is controlled to decrease to a first preset opening at a first preset rate, and the opening of the indoor unit electronic expansion valve is controlled to be adjusted to a second preset opening; when the above-mentioned operating mode is a heating mode, the opening of the heating electronic expansion valve of the air-conditioning unit is controlled to decrease to a third preset opening at a second preset rate, and the opening of the indoor unit electronic expansion valve is controlled to decrease to a fourth preset opening at a third preset rate.

[0042] Assuming that the maximum valve opening of the heating electronic expansion valve and the indoor unit electronic expansion valve of the air-conditioning unit is 480pls, the first preset rate can be set to 40pls / s, the second preset rate can be set to 20pls / s, the third preset rate can be set to 40pls / s, the first preset opening can be set to 120pls, the second preset opening can be set to 100pls, the third preset opening can be set to 100pls, and the fourth preset opening can be set to 120pls.

[0043] This method controls the outdoor compressor to stop operating when the indoor unit receives a shutdown signal and is in cooling mode, and the heating electronic expansion valve reduces the valve opening at a speed of 40pls / s until it reaches 120pls, and the indoor unit electronic expansion valve is reduced to 100pls; when the indoor unit receives a shutdown signal and is in heating mode, the heating electronic expansion valve first reduces the valve opening at a speed of 20pls / s, stops after reaching 100pls, and the indoor unit electronic expansion valve reduces the valve opening at a speed of 40pls / s until it reaches 120pls. In this way, when the compressor stops operating, the problem of liquid return caused by a sudden decrease in pressure can be avoided.

[0044] Specifically, the method further includes: upon receiving a start-up instruction of the air-conditioning unit, obtaining the pressure at the exhaust port of the compressor, and controlling the start-up of the air-conditioning unit at least according to the pressure at the exhaust port of the compressor.

[0045] The method detects the compressor exhaust pressure before the air conditioner is turned on, which can prevent the problem of high pressure difference between the indoor unit and the outdoor unit when the air conditioner unit is turned on, thereby preventing damage to the components of the air conditioner unit.

[0046] More specifically, the air-conditioning unit is started up at least according to the compressor exhaust pressure, including: obtaining the compressor exhaust temperature, and determining whether the compressor exhaust pressure is greater than the preset pressure when it is determined that the compressor exhaust temperature is greater than or equal to the first preset temperature; when the compressor exhaust pressure is greater than the preset pressure, adjusting the opening of the heating electronic expansion valve to a fifth preset opening, and continuing to detect the compressor exhaust pressure until the compressor exhaust pressure is less than or equal to the preset pressure, and then controlling the air-conditioning unit to start up.

[0047] Among them, the first preset temperature can be set to 40°C, the preset pressure can be set to 1.1Mpa, and the fifth preset opening is 120pls;

[0048] In this method, if the pressure at the compressor exhaust port is higher than the preset pressure, the heating electronic expansion valve will be opened to 120pls. Since the system is connected, if there is a pressure difference in the compressor, the high pressure in the compressor will be released into the pipeline system. When the pressure of the pressure sensor drops to the preset value, the unit can be started.

[0049] The reason why most of the existing air-conditioning units quickly close the electronic expansion valve after shutting down is to prevent the refrigerant on the high-pressure side from flowing into the low-pressure suction side due to the pressure difference after the compressor stops running, resulting in liquid refrigerant when the compressor starts and liquid hammer. This method does not close the electronic expansion valve for the first time when the air-conditioning unit is shut down. Since the main cause of this problem is the liquid storage in the compressor, in order to prevent the above situation from occurring, it is necessary to detect the exhaust temperature of the compressor. When the exhaust temperature is greater than or equal to 40°C, the compressor will return liquid appropriately. After the refrigerant and compressor oil are mixed in this state, starting the compressor will not directly cause damage to the unit. At this time, the unit can be started directly without the risk of liquid hammer.

[0050] Furthermore, the start-up of the air-conditioning unit is controlled at least according to the pressure at the exhaust port of the compressor, including: obtaining the temperature of the oil temperature sensing bag, and determining whether the pressure at the exhaust port of the compressor is greater than the preset pressure when determining that the temperature of the oil temperature sensing bag is greater than or equal to the second preset temperature, wherein the oil temperature sensing bag is arranged at the bottom of the compressor; when the pressure at the exhaust port of the compressor is greater than the preset pressure, adjusting the opening of the electronic expansion valve to the first preset opening, and continuing to detect the pressure at the exhaust port of the compressor until the pressure at the exhaust port of the compressor is less than or equal to the preset pressure, controlling the start-up of the air-conditioning unit.

[0051] This method can also determine the oil temperature. An oil temperature sensor is arranged at the bottom of the compressor. Since the oil temperature is at the bottom of the compressor, it is closer to the actual temperature of the refrigerant, so the preset value should be set lower. When the oil temperature sensor is used as the judgment, the preset value T = 38°C. If the oil temperature ≥ T, the unit can be started directly and the above-mentioned high-pressure difference starting process can be performed. If the oil temperature is < T, before the high-pressure difference starting process is performed, electric heating must be used to heat the compressor. When the oil temperature ≥ T, the electric heating belt stops working.

[0052] Furthermore, after obtaining the compressor exhaust temperature, the method further includes: when it is determined that the compressor exhaust temperature is lower than the first preset temperature, heating the compressor until the compressor exhaust temperature is greater than or equal to the first preset temperature.

[0053] In the case where the method detects that the compressor exhaust temperature is less than the first preset temperature, the compressor needs to be heated by an electric heating belt until the compressor exhaust temperature is greater than or equal to the first preset temperature. This avoids the risk of liquid hammer when the air conditioning unit is directly started.

[0054] Specifically, after the compressor exhaust pressure is less than or equal to the preset pressure, the method further includes: obtaining the indoor unit humidity of the air-conditioning unit, and determining whether the indoor unit humidity is less than the preset humidity; when it is determined that the indoor unit humidity is less than the preset humidity, controlling the air-conditioning unit to turn on.

[0055] In this method, since the indoor valve of the air-conditioning unit will not be turned to 0pls immediately after being shut down, after the unit receives the shutdown command, in the cooling mode, some low-temperature liquid refrigerant may enter the indoor unit. The liquid refrigerant will evaporate and absorb heat in the indoor heat exchanger, causing condensation on the heat exchanger fins. If the unit is started again in a short time, there will be a risk of water blowing. Therefore, before starting the air-conditioning unit, it is necessary to detect the humidity of the indoor unit. Multi-split indoor units are generally equipped with humidity sensors. When the humidity received by the indoor sensor is greater than or equal to 75%, the air-conditioning unit will not start even if it receives the startup command. The indoor unit can only start when the condensed water on the indoor heat exchanger fins falls into the water tray and the humidity received by the humidity sensor is lower than 75%.

[0056] In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the control method of the air-conditioning unit of the present application will be described in detail below in combination with specific embodiments.

[0057] This embodiment relates to a specific control method for an air conditioning unit, which specifically includes the following contents:

[0058] Taking the cooling mode as an example, when the compressor is close to full load and the operation is stable, the exhaust pressure is generally in the range of 2.5-3MPa, and the suction pressure is generally in the range of 0.8-1.5Mpa. Under normal circumstances, after the shutdown command is applied to the indoor unit, the outdoor unit first stops the operation of the compressor, and then the outdoor unit valve and the indoor unit valve are gradually reduced to 0. However, even if the compressor stops operating, since the system pipeline is sealed, after the outdoor unit valve and the indoor unit valve are reduced to 0, there is still a pressure difference in the pipeline from the indoor unit to the outdoor unit. During the next startup process, as the outdoor unit valve opens, the pressure difference in the pipeline is transmitted to the compressor as the electronic expansion valve opens. The compressor may be affected by the initial pressure difference during operation, which is not conducive to the normal operation of the compressor and will accelerate the mechanical damage of the compressor.

[0059] By detecting the pressure in the pipeline, the electronic expansion valves of the indoor and outdoor units are adjusted before the unit is started to balance the system pressure. To implement this control method, a pressure sensor A needs to be installed at the compressor exhaust port of the air-conditioning unit, and corresponding pressure sensors 1, 2, and 3 need to be arranged on the inlet pipe of each indoor unit. The specific implementation method is as follows:

[0060] like Figure 3 As shown, in cooling mode, the air conditioner shuts down after running smoothly. At this time, the detection pressure of the air conditioner pressure sensor A should be the exhaust pressure of the air conditioner, that is, high pressure. At this time, in order to relieve pressure, the heating electronic expansion valve of the outdoor unit cannot be closed immediately. Assuming that the maximum valve opening of the heating electronic expansion valve and the indoor unit electronic expansion valve of the air conditioner is 480pls, the opening of the outdoor unit electronic expansion valve should be fully open after the cooling operation is stable. When the indoor unit receives the shutdown signal, the outdoor unit compressor stops operating, and the heating electronic expansion valve reduces the valve opening at a speed of 40pls / s until it reaches 120pls, and the indoor unit electronic expansion valve is reduced to 100pls. After a period of time, if the pressure difference detected by pressure sensor A and pressure sensors 1, 2, and 3 is within 0.1Mpa, the valve steps of the indoor unit electronic expansion valve and the heating electronic expansion valve are adjusted to 0, and the system pressure is balanced at this time.

[0061] like Figure 4As shown, in the heating mode, after stable operation, the indoor unit electronic expansion valve will usually be fully opened, and the heating electronic expansion valve will be opened at a smaller degree to ensure the throttling capacity. After the heating operation is stable, the machine will be shut down. Since the compressor stops running, in order to prevent the sudden decrease in pressure from causing liquid return, the heating electronic expansion valve will first reduce the valve opening at a speed of 20pls / s, and stop after 100pls. The indoor unit electronic expansion valve will reduce the valve opening at a speed of 40pls / s until it is reduced to 120pls. After a period of time, if the pressure difference detected by pressure sensor A and pressure sensors 1, 2, and 3 is detected to be within 0.1Mpa, the valve steps of the indoor unit electronic expansion valve and the heating electronic expansion valve are adjusted to 0, and the system pressure is balanced at this time.

[0062] like Figure 5 As shown, before the next start of the air-conditioning unit, the outdoor unit receives the start-up signal from the indoor unit, and the pressure sensor A and pressure sensors 1, 2, and 3 transmit the detected values ​​to the main control module, and the initial pressure value is preset. Assume that the preset value is P. The system balance pressure of units with different capacities is different. Assume that the preset value is 1.1Mpa. If the pressure P1 detected by the pressure sensor A is higher than the preset value P, the heating electronic expansion valve is opened to 120pls. Since the system is connected, if there is a pressure difference in the compressor, the high pressure in the compressor will be released into the pipeline system. When the pressure of the pressure sensor drops to the preset value, the unit can be started.

[0063] In addition to the control method before starting mentioned above, this embodiment also proposes another startup method before starting the indoor unit without fully opening the indoor unit, which mainly adjusts the pressure in the system by controlling the electronic expansion valve of the indoor unit.

[0064] Before starting, the outdoor unit receives the start-up signal from indoor unit No. 1, and pressure sensor 1 detects the pressure of the indoor unit. If the value of pressure sensor 1 is greater than the preset value P, the electronic expansion valves of the other three indoor units that are not turned on are opened to 50pls. After 10s, the value P1 of pressure sensor 1 is re-detected and compared with the preset value P. If the difference in the value of pressure sensor 1 is within 0.1MPa, the opening of the electronic expansion valves of the three indoor units that are not turned on is closed to 0pls, and the unit meets the start-up conditions and starts.

[0065] In addition, the reason why most air conditioners in the prior art quickly close the electronic expansion valve after shutting down is to prevent the refrigerant on the high-pressure side from flowing into the low-pressure suction side due to the pressure difference after the compressor stops running, resulting in liquid refrigerant being present when the compressor starts, causing liquid hammer. However, the control method of this embodiment does not close the electronic expansion valve immediately when the air conditioner is shut down. In order to prevent the above situation from happening, a control program needs to be added before starting.

[0066] Since the main cause of this problem is the accumulation of liquid in the compressor, the exhaust temperature T1 of the compressor is detected before starting the machine, and a temperature preset value T is set. Assuming T = 40°C, when the exhaust temperature is 40°C, the compressor will return liquid appropriately. After the refrigerant and compressor oil are mixed in this state, the compressor startup will not directly cause damage to the unit. At this time, the unit can be started directly without the risk of liquid hammer. If the exhaust temperature T1 of the unit's compressor is ≥T, the unit can be started directly and the above-mentioned high-pressure difference startup process is carried out. If the exhaust temperature T1 of the unit is <T, before the high-pressure difference startup process is carried out, the compressor needs to be heated with an electric heating belt. When T1 ≥T, the electric heating belt stops working, and then the above-mentioned high-pressure difference startup process is carried out. In addition, the oil temperature can also be judged by arranging an oil temperature sensing bag at the bottom of the compressor. The oil temperature displayed by the sensing bag is T2. Since the oil temperature is at the bottom of the compressor, it is closer to the actual temperature value of the refrigerant, so the preset value should be set lower. When the oil temperature sensing bag is used as the judgment, the preset value T = 38°C. If the oil temperature T2≥T, the unit can be started directly and the above-mentioned high-pressure difference starting process can be carried out. If T2<T, before the high-pressure difference starting process is carried out, electric heating is required to heat the compressor. When T2≥T, the electric heating belt stops working.

[0067] Since the indoor valve will not be turned to 0pls immediately after the unit is shut down, after the unit receives the shutdown command, in the cooling mode, some low-temperature liquid refrigerant may enter the indoor unit. The liquid refrigerant will evaporate and absorb heat in the indoor heat exchanger, causing condensation on the heat exchanger fins. If the unit is started again in a short time, there will be a risk of water blowing. Therefore, before starting the unit, it is necessary to detect the humidity of the indoor unit. Multi-split indoor units are generally equipped with humidity sensors. When the humidity received by the indoor sensor is greater than or equal to 75%, the unit will not start even if it receives a startup command. The indoor unit can only start when the condensed water on the indoor heat exchanger fins falls to the water tray and the humidity received by the humidity sensor is lower than 75%.

[0068] This embodiment adjusts the opening of the electronic expansion valve according to the operating mode of the air-conditioning unit to balance the system pressure before each shutdown and startup of the air-conditioning unit, thereby solving the problem in the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components.

[0069] The embodiment of the present application also provides a control device for an air-conditioning unit. It should be noted that the control device for the air-conditioning unit of the embodiment of the present application can be used to execute the control method for the air-conditioning unit provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions thereof will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0070] The following is an introduction to the control device of the air-conditioning unit provided in the embodiment of the present application.

[0071] Figure 6 Schematic diagram of a control device for an air conditioning unit according to an embodiment of the present application. Figure 6 As shown, the device comprises:

[0072] The regulating unit 61 is used to determine the operation mode of the air-conditioning unit when receiving the shutdown command of the air-conditioning unit, and adjust the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0073] The acquisition unit 62 is used to acquire the pressure difference of the air-conditioning unit after adjusting the opening of the electronic expansion valve to the preset opening, wherein the pressure difference is the difference between the exhaust pressure of the compressor of the air-conditioning unit and the inlet pressure of the indoor unit;

[0074] The first control unit 63 is used to control the air conditioning unit to shut down when it is determined that the pressure difference is less than a preset difference.

[0075] In this embodiment, the regulating unit is used to determine the operation mode of the air-conditioning unit when receiving the shutdown command of the air-conditioning unit, and adjust the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve; the acquiring unit is used to acquire the pressure difference of the air-conditioning unit after adjusting the opening of the electronic expansion valve to the preset opening, wherein the pressure difference is the difference between the compressor exhaust port pressure of the air-conditioning unit and the indoor unit inlet pipe pressure; the first control unit is used to control the air-conditioning unit to shut down when it is determined that the pressure difference is less than the preset difference. By adjusting the opening of the electronic expansion valve according to the operation mode of the air-conditioning unit before shutting down each time to balance the system pressure, the problem of the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components is solved.

[0076] As an optional scheme, the adjustment unit includes a first control module and a second control module; the first control module is used to control the opening of the heating electronic expansion valve of the above-mentioned air-conditioning unit to decrease to a first preset opening at a first preset rate when the above-mentioned operating mode is a cooling mode, and control the opening of the above-mentioned indoor unit electronic expansion valve to be adjusted to a second preset opening; the second control module is used to control the opening of the heating electronic expansion valve of the above-mentioned air-conditioning unit to decrease to a third preset opening at a second preset rate when the above-mentioned operating mode is a heating mode, and control the opening of the indoor unit electronic expansion valve to decrease to a fourth preset opening at a third preset rate.

[0077] In an optional solution, the device also includes a second control unit, which is used to obtain the exhaust pressure of the compressor upon receiving a start-up instruction of the air-conditioning unit, and control the start-up of the air-conditioning unit at least according to the exhaust pressure of the compressor.

[0078] An optional scheme, the second control unit includes a first determination module and a first adjustment module; the first determination module is used to obtain the compressor exhaust temperature, and when it is determined that the compressor exhaust temperature is greater than or equal to the first preset temperature, determine whether the compressor exhaust port pressure is greater than the preset pressure; the first adjustment module is used to adjust the opening of the heating electronic expansion valve to a fifth preset opening when the compressor exhaust port pressure is greater than the preset pressure, and continue to detect the compressor exhaust port pressure until the compressor exhaust port pressure is less than or equal to the preset pressure, and control the air-conditioning unit to start up.

[0079] An optional solution, the second control unit includes a second determination module and a second adjustment module; the second determination module is used to obtain the temperature of the oil temperature sensing bag, and when it is determined that the temperature of the oil temperature sensing bag is greater than or equal to the second preset temperature, determine whether the pressure at the exhaust port of the compressor is greater than the preset pressure, wherein the oil temperature sensing bag is arranged at the bottom of the compressor; the second adjustment module is used to adjust the opening of the electronic expansion valve to the first preset opening when the pressure at the exhaust port of the compressor is greater than the preset pressure, and continue to detect the pressure at the exhaust port of the compressor until the pressure at the exhaust port of the compressor is less than or equal to the preset pressure, and control the air-conditioning unit to start up.

[0080] In an optional scheme, the second control unit also includes a heating processing module, which is used to, after obtaining the compressor exhaust temperature, perform heating processing on the compressor when it is determined that the compressor exhaust temperature is less than the first preset temperature, until the compressor exhaust temperature is greater than or equal to the first preset temperature.

[0081] An optional solution, the second control unit also includes an acquisition module and a third control module; the acquisition module is used to obtain the indoor unit humidity of the above-mentioned air-conditioning unit after the above-mentioned compressor exhaust port pressure is less than or equal to the above-mentioned preset pressure, and determine whether the above-mentioned indoor unit humidity is less than the preset humidity; the third control module is used to control the above-mentioned air-conditioning unit to start up when it is determined that the above-mentioned indoor unit humidity is less than the above-mentioned preset humidity.

[0082] The control device of the air conditioning unit includes a processor and a memory. The adjustment unit, the acquisition unit and the first control unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0083] An embodiment of the present invention provides an air conditioning unit, comprising: a controller, configured to execute any one of the above-mentioned control methods for the air conditioning unit.

[0084] Specifically, the control method of the air conditioning unit includes:

[0085] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0086] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0087] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0088] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the kernel parameters can be adjusted to solve the problem of the prior art that the air conditioner unit is directly shut down when there is a high pressure difference, which will accelerate the loss of air conditioner components.

[0089] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0090] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, a device where the computer-readable storage medium is located is controlled to execute the control method of the air-conditioning unit.

[0091] Specifically, the control method of the air conditioning unit includes:

[0092] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0093] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0094] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0095] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the control method of the air-conditioning unit is executed when the program is run.

[0096] Specifically, the control method of the air conditioning unit includes:

[0097] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0098] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0099] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0100] An embodiment of the present invention provides an electronic device, the device comprising a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0101] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0102] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0103] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0104] The devices in this article can be servers, PCs, PADs, mobile phones, etc.

[0105] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0106] Step S201, when receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve;

[0107] Step S202, after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust pressure of the air-conditioning unit and the indoor unit inlet pressure;

[0108] Step S203, when it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

[0109] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0110] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0111] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0112] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0113] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0114] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0115] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0116] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0117] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0118] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0119] 1) A control method of an air-conditioning unit of the present application comprises: upon receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve comprises a heating electronic expansion valve and an indoor unit electronic expansion valve; after adjusting the opening of the electronic expansion valve to the preset opening, obtaining the pressure difference of the air-conditioning unit, wherein the pressure difference is the difference between the compressor exhaust port pressure of the air-conditioning unit and the indoor unit inlet pipe pressure; and controlling the air-conditioning unit to shut down when it is determined that the pressure difference is less than the preset difference. By adjusting the opening of the electronic expansion valve according to the operation mode of the air-conditioning unit before shutting down each time to balance the system pressure, the problem of the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components is solved.

[0120] 2) A control device for an air-conditioning unit of the present application comprises: an adjusting unit, which is used to determine the operation mode of the air-conditioning unit upon receiving a shutdown command of the air-conditioning unit, and adjust the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve comprises a heating electronic expansion valve and an indoor unit electronic expansion valve; an acquiring unit, which is used to acquire the pressure difference of the air-conditioning unit after adjusting the opening of the electronic expansion valve to the preset opening, wherein the pressure difference is the difference between the compressor exhaust port pressure of the air-conditioning unit and the indoor unit inlet pipe pressure; a first control unit, which is used to control the air-conditioning unit to shut down when it is determined that the pressure difference is less than the preset difference. By adjusting the opening of the electronic expansion valve according to the operation mode of the air-conditioning unit before each shutdown of the air-conditioning unit to balance the system pressure, the problem of the prior art that directly shutting down the air-conditioning unit when there is a high pressure difference will accelerate the loss of air-conditioning components is solved.

[0121] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for an air conditioning unit, characterized in that: include: In the case of receiving a shutdown command of the air-conditioning unit, determining the operation mode of the air-conditioning unit, and adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve; After adjusting the opening of the electronic expansion valve to the preset opening, obtaining a pressure difference of the air-conditioning unit, wherein the pressure difference is a difference between a compressor exhaust pressure of the air-conditioning unit and an indoor unit inlet pressure; When it is determined that the pressure difference is less than a preset difference, the air conditioning unit is controlled to shut down.

2. The method according to claim 1, characterized in that: Adjusting the opening of the electronic expansion valve of the air-conditioning unit to a preset opening according to the operation mode includes: When the operation mode is the cooling mode, the opening of the heating electronic expansion valve of the air-conditioning unit is controlled to decrease to a first preset opening at a first preset rate, and the opening of the indoor unit electronic expansion valve is controlled to be adjusted to a second preset opening; When the operating mode is the heating mode, the opening of the heating electronic expansion valve of the air-conditioning unit is controlled to decrease from a second preset rate to a third preset opening, and the opening of the indoor unit electronic expansion valve is controlled to decrease from a third preset rate to a fourth preset opening.

3. The method according to claim 1, characterized in that The method further comprises: When a start-up instruction of the air-conditioning unit is received, the pressure of the compressor exhaust port is obtained, and the start-up of the air-conditioning unit is controlled at least according to the pressure of the compressor exhaust port.

4. The method according to claim 3, characterized in that Controlling the air conditioning unit to start up at least according to the compressor exhaust pressure, comprising: Acquire the compressor exhaust temperature, and when it is determined that the compressor exhaust temperature is greater than or equal to a first preset temperature, determine whether the compressor exhaust port pressure is greater than a preset pressure; When the pressure at the compressor exhaust port is greater than the preset pressure, the opening of the heating electronic expansion valve is adjusted to the fifth preset opening, and the compressor exhaust port pressure is continuously detected until the compressor exhaust port pressure is less than or equal to the preset pressure, and the air-conditioning unit is controlled to start up.

5. The method according to claim 3, characterized in that: Controlling the air conditioning unit to start up at least according to the compressor exhaust pressure, comprising: Obtaining the temperature of the oil temperature sensing package, and determining whether the pressure at the exhaust port of the compressor is greater than the preset pressure when determining that the temperature of the oil temperature sensing package is greater than or equal to the second preset temperature, wherein the oil temperature sensing package is arranged at the bottom of the compressor; When the pressure at the compressor exhaust port is greater than the preset pressure, the opening of the electronic expansion valve is adjusted to a first preset opening, and the pressure at the compressor exhaust port is continuously detected until the pressure at the compressor exhaust port is less than or equal to the preset pressure, and the air-conditioning unit is controlled to start up.

6. The method according to claim 4, characterized in that After obtaining the compressor exhaust temperature, the method further includes: When it is determined that the compressor exhaust temperature is lower than the first preset temperature, the compressor is heated until the compressor exhaust temperature is higher than or equal to the first preset temperature.

7. The method according to claim 4, characterized in that When the compressor exhaust pressure is less than or equal to the preset pressure, the method further includes: The indoor unit humidity of the air-conditioning unit is obtained, and it is determined whether the indoor unit humidity is less than a preset humidity; if it is determined that the indoor unit humidity is less than the preset humidity, the air-conditioning unit is controlled to start up.

8. A control device for an air conditioning unit, characterized in that: include: an adjusting unit, configured to determine an operating mode of the air-conditioning unit upon receiving a shutdown command of the air-conditioning unit, and adjust the opening of an electronic expansion valve of the air-conditioning unit to a preset opening according to the operating mode, wherein the electronic expansion valve includes a heating electronic expansion valve and an indoor unit electronic expansion valve; an acquisition unit, configured to acquire a pressure difference value of the air-conditioning unit after adjusting the opening of the electronic expansion valve to the preset opening, wherein the pressure difference value is a difference between a compressor exhaust port pressure and an indoor unit inlet pipe pressure of the air-conditioning unit; The first control unit is used to control the air conditioning unit to shut down when it is determined that the pressure difference is less than a preset difference.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the control method for the air-conditioning unit according to any one of claims 1 to 7.

10. An air conditioning unit, characterized in that: include: A controller, used to execute the control method of the air conditioning unit according to any one of claims 1 to 7.

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