Air conditioner and control method thereof

Abstract

The embodiment of the application discloses an air conditioner and a control method thereof, relates to the technical field of air conditioners, and aims to solve the problem that the air conditioner cannot accurately run a suitable operation mode when the outdoor environment temperature is in an intermediate temperature range. The air conditioner comprises an outdoor unit, an indoor unit, a refrigerant circulation loop, a compressor, a four-way valve, a first temperature sensor, a second temperature sensor and a controller. The controller is configured to: when the air conditioner is started, acquire an operation mode at the end of the last operation of the air conditioner, a first suction temperature detected by the first temperature sensor and a first outdoor environment temperature detected by the second temperature sensor; in the case that the first outdoor environment temperature is within a preset environment temperature range and the operation mode at the end of the last operation of the air conditioner is an automatic operation mode, determine a target operation mode of the air conditioner according to the first suction temperature; and control the air conditioner to run in the target operation mode.

Description

Technical Field

[0001] This application relates to the field of air conditioner technology, and in particular to an air conditioner and its control method. Background Technology

[0002] With the continuous improvement of living standards, air conditioners have gradually become a common household appliance. By judging the outdoor ambient temperature, the air conditioner operates in either cooling or heating mode to keep the indoor temperature within the user's comfortable range. However, when the air conditioner is in automatic mode, if the outdoor ambient temperature is in the intermediate temperature range, the system may misjudge the temperature, causing it to operate in heating mode when it should be in cooling mode.

[0003] Therefore, how to accurately and reasonably select the operating mode when the air conditioner is in automatic mode to improve the user experience has become an urgent problem to be solved. Summary of the Invention

[0004] This application provides an air conditioner and its control method to solve the problem that the air conditioner cannot accurately operate in a suitable operating mode when the outdoor ambient temperature is in the intermediate temperature range.

[0005] To achieve the above objectives, this application adopts the following technical solution.

[0006] In a first aspect, embodiments of this application provide an air conditioner, comprising: an outdoor unit including an outdoor heat exchanger; an indoor unit including an indoor heat exchanger; wherein the outdoor heat exchanger and the indoor heat exchanger function as a condenser and an evaporator, respectively; a refrigerant circulation loop for controlling the circulation of refrigerant in a loop consisting of a compressor, condenser, expansion valve, four-way valve, and evaporator; a compressor for compressing refrigerant gas and discharging it to the condenser; a four-way valve for controlling the refrigerant flow direction in the refrigerant circulation loop; a first temperature sensor disposed at the air intake of the indoor unit for detecting the intake temperature; a second temperature sensor disposed at the outdoor unit for detecting the outdoor ambient temperature; and a controller configured to: when the air conditioner is started, acquire the operating mode at the end of the previous operation of the air conditioner, the first intake temperature detected by the first temperature sensor, and the first outdoor ambient temperature detected by the second temperature sensor; if the first outdoor ambient temperature is within a preset ambient temperature range and the operating mode at the end of the previous operation of the air conditioner was an automatic operating mode, determine the target operating mode of the air conditioner based on the first intake temperature; and control the air conditioner to operate in the target operating mode.

[0007] The technical solution provided in this application provides at least the following beneficial effects: This technical solution uses parameters such as the operating mode at the end of the previous run, the suction temperature at the start of this run, and the difference in suction temperature before and after the current run to determine the target operating mode of the air conditioner through multiple judgment methods. This judgment method is more accurate and better reflects the actual needs of the user. Simultaneously, by controlling the air conditioner to operate in the target operating mode, the most suitable operating mode can be implemented under different conditions, resulting in a more comfortable indoor temperature and a better user experience.

[0008] In some embodiments, the controller is configured to determine the target operating mode of the air conditioner based on a first intake temperature, specifically configured to: acquire a second intake temperature of the air conditioner; the second intake temperature is used to indicate the intake temperature at the end of the last operation of the air conditioner; when the first intake temperature is greater than or equal to a first preset threshold, and the difference between the first intake temperature and the second intake temperature is greater than or equal to a second preset threshold, the target operating mode of the air conditioner is determined to be a cooling operating mode.

[0009] In some embodiments, the controller is configured to determine the target operating mode of the air conditioner based on a first intake temperature, specifically configured to determine the target operating mode of the air conditioner as a heating operating mode when the first intake temperature is less than a first preset threshold.

[0010] In some embodiments, the controller is configured to determine the target operating mode of the air conditioner based on a first intake temperature, specifically configured to: when the difference between the first intake temperature and the second intake temperature is less than a second preset threshold, obtain the state of the four-way valve at the end of the last operation of the air conditioner; wherein the state of the four-way valve includes an open state or a closed state; and determine the target operating mode of the air conditioner based on the state of the four-way valve.

[0011] In some embodiments, the controller is configured to determine the target operating mode of the air conditioner based on the state of the four-way valve. Specifically, it is configured to: determine the target operating mode of the air conditioner as a cooling operating mode when the four-way valve is in a closed state; and determine the target operating mode of the air conditioner as a heating operating mode when the four-way valve is in an open state and the first suction temperature is less than a first preset threshold.

[0012] In some embodiments, the controller is configured to determine the target operating mode of the air conditioner based on the state of the four-way valve. Specifically, it is configured to: when the four-way valve is in the open state, if the first suction temperature is less than a first preset threshold, determine the target operating mode of the air conditioner as a heating operating mode; or, if the first suction temperature is greater than or equal to the first preset threshold, control the air conditioner to operate in a heating operating mode; when the duration of the air conditioner operating in the heating operating mode reaches a first preset duration, control the compressor to operate at a target operating frequency, the target operating mode being determined based on the first suction temperature; when the duration of the compressor operating at the target operating frequency reaches the first preset duration, acquire a third suction temperature detected by a first temperature sensor; if the difference between the first suction temperature and the third suction temperature is greater than or equal to a third preset threshold, determine the target operating mode of the air conditioner as a cooling operating mode.

[0013] In some embodiments, the controller is further configured to: acquire a second outdoor ambient temperature of the air conditioner; the second outdoor ambient temperature is used to indicate the outdoor ambient temperature at the end of the last operation of the air conditioner; when the first outdoor ambient temperature is within a preset ambient temperature range, and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is greater than or equal to a fourth preset threshold, if the operating mode at the end of the last operation of the air conditioner was a heating operating mode, determine that the target operating mode of the air conditioner is a cooling operating mode; or, if the operating mode at the end of the last operation of the air conditioner was a cooling operating mode, determine that the target operating mode of the air conditioner is a heating operating mode.

[0014] In some embodiments, the controller is further configured to: when the first outdoor ambient temperature is within a preset ambient temperature range and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is less than a fourth preset threshold, if the operating mode at the end of the last operation of the air conditioner was a heating operating mode, determine that the target operating mode of the air conditioner is a heating operating mode; or, if the operating mode at the end of the last operation of the air conditioner was a cooling operating mode, determine that the target operating mode of the air conditioner is a cooling operating mode.

[0015] In some embodiments, the controller is further configured to: determine the target operating mode of the air conditioner as a cooling operating mode when the first outdoor ambient temperature is greater than or equal to the maximum temperature value in the preset ambient temperature range; or determine the target operating mode of the air conditioner as a heating operating mode when the first outdoor ambient temperature is less than or equal to the minimum temperature value in the preset ambient temperature range.

[0016] Secondly, embodiments of this application provide a control method for an air conditioner, comprising: when the air conditioner is started, acquiring the operating mode, a first intake temperature, and a first outdoor ambient temperature at the end of the last operation of the air conditioner; if the first outdoor ambient temperature is within a preset ambient temperature range and the operating mode at the end of the last operation of the air conditioner is an automatic operating mode, determining a target operating mode of the air conditioner based on the first intake temperature; and controlling the air conditioner to operate in the target operating mode.

[0017] Thirdly, embodiments of this application provide a controller, including: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes any of the air conditioner control methods provided in the second aspect.

[0018] Fourthly, embodiments of this application provide a computer-readable storage medium including computer instructions that, when executed on a computer, cause the computer to perform the methods provided in the second aspect and possible implementations.

[0019] Fifthly, embodiments of the present invention provide a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the methods provided in the second aspect and possible implementations.

[0020] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor or may be packaged separately from the controller's processor; this application does not impose any limitations on this.

[0021] The beneficial effects described in aspects two through five of this application can be referred to the analysis of the beneficial effects of aspect one, and will not be repeated here. Attached Figure Description

[0022] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0023] Figure 1 This is a schematic diagram of the composition of an air conditioner provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of a throttling device provided in an embodiment of this application;

[0025] Figure 3This is a schematic diagram of another throttling device provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the circuit structure of an air conditioner provided in an embodiment of this application;

[0027] Figure 5 This application provides a schematic diagram of the structure of an indoor unit.

[0028] Figure 6 A schematic diagram illustrating the refrigerant flow direction in an air conditioner, provided as an embodiment of this application;

[0029] Figure 7 A hardware configuration block diagram of an air conditioner provided in an embodiment of this application;

[0030] Figure 8 A flowchart of a control method for an air conditioner provided in an embodiment of this application;

[0031] Figure 9 A flowchart illustrating another air conditioner control method provided in this application embodiment;

[0032] Figure 10 A flowchart illustrating another air conditioner control method provided in this application embodiment;

[0033] Figure 11 A flowchart illustrating another air conditioner control method provided in this application embodiment;

[0034] Figure 12 A flowchart illustrating another air conditioner control method provided in this application embodiment;

[0035] Figure 13 A flowchart illustrating another air conditioner control method provided in this application embodiment. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0040] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0041] In this application, the air conditioner performs a refrigeration cycle by using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air.

[0042] In some embodiments, the compressor compresses the refrigerant gas in a conditioned state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0043] In some embodiments, the expansion valve expands the liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve and returns the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves a cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0044] In some embodiments, the outdoor unit of an air conditioner refers to the portion of the refrigeration cycle that includes a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in either the indoor or outdoor unit.

[0045] In some embodiments, the indoor heat exchanger and the outdoor heat exchanger serve as either a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0046] In existing technologies, when air conditioners are running in automatic mode, they cannot accurately and reasonably select the operating mode, resulting in unsuitable indoor temperatures and a reduced user experience.

[0047] Based on this, this application provides an air conditioner, including: an outdoor unit including an outdoor heat exchanger; an indoor unit including an indoor heat exchanger; wherein, the outdoor heat exchanger and the indoor heat exchanger, one functions as a condenser and the other as an evaporator; a refrigerant circulation loop for controlling the circulation of refrigerant in a loop consisting of a compressor, condenser, expansion valve, four-way valve, and evaporator; a compressor for compressing refrigerant gas and discharging it to the condenser; a four-way valve for controlling the refrigerant flow direction in the refrigerant circulation loop; a first temperature sensor disposed at the air intake of the indoor unit for detecting the intake temperature; a second temperature sensor disposed at the outdoor unit for detecting the outdoor ambient temperature; and a controller configured to: when the air conditioner is started, acquire the operating mode at the end of the previous operation of the air conditioner, the first intake temperature detected by the first temperature sensor, and the first outdoor ambient temperature detected by the second temperature sensor; if the first outdoor ambient temperature is within a preset ambient temperature range and the operating mode at the end of the previous operation of the air conditioner was automatic operation mode, determine the target operating mode of the air conditioner based on the first intake temperature; and control the air conditioner to operate in the target operating mode.

[0048] In this way, the air conditioner can operate in the most suitable mode under different conditions, making the indoor temperature more comfortable and improving the user experience.

[0049] The embodiments provided in this application will now be described in detail with reference to the accompanying drawings.

[0050] Figure 1 This is a schematic diagram illustrating the composition of an air conditioner, as exemplarily provided in an embodiment of this application. Figure 1 As shown, the air conditioner 1 includes an outdoor unit 2, an indoor unit 3, a remote control 4, and a controller 1000. Figure 1 (Not shown in the image).

[0051] In some embodiments, the outdoor unit 2, typically installed outdoors, is used for heat exchange with the indoor environment. Additionally, in Figure 1 In the diagram, outdoor unit 2 is located on the opposite side of indoor unit 3, separated by wall WL. Outdoor unit 2 is represented by a dashed line.

[0052] In some embodiments, the indoor unit 3, taking a wall-mounted unit as an example, is typically installed on an indoor wall surface such as WL. Another example is a floor-standing unit (…). Figure 1 (Not shown in the image) is also a type of indoor unit.

[0053] In some embodiments, the remote controller 4 has the function of communicating with the controller 1000, for example, using infrared or other communication methods. The remote controller 4 is used by the user to perform various controls on the air conditioner 1, realizing interaction between the user and the air conditioner 1.

[0054] Figure 2 This is a schematic diagram of a throttling device provided in an embodiment of this application. Figure 2 As shown, the throttling device 21 includes an expansion valve 211. There is a pipe connection between the outdoor unit 2 and the indoor unit 3, and the expansion valve 211 is installed on the pipe between the indoor unit 3 and the outdoor unit 2. The pipe, also known as the gas-liquid pipe, includes: a gas pipe for transporting gaseous refrigerant and a liquid pipe for transporting two-phase refrigerant.

[0055] In some embodiments, the throttling device 21 is used to regulate the fluid flow rate in the air conditioning gas-liquid pipe and to regulate the refrigerant flow rate. The expansion valve 211 is used to regulate the refrigerant supply in the pipe. The expansion valve 211 can be independent of the outdoor unit 2.

[0056] In some embodiments, the expansion valve 211 may also be part of the outdoor unit 2 (e.g., Figure 3 As shown), Figure 3 This is a schematic diagram of another throttling device provided in accordance with an exemplary embodiment of this application.

[0057] In addition, outdoor unit 2, throttling device 21, and indoor unit 3 are all connected to controller 1000 via communication. Figure 1 (not shown in the image), and performs related operations according to the instructions of the controller 1000.

[0058] Taking expansion valve 211, which is part of outdoor unit 2, as an example, Figure 4 This is a schematic diagram of the circuit structure of an air conditioner provided in an embodiment of this application. Figure 4 As shown, the air conditioner 1 also includes a refrigerant circuit 10.

[0059] In some embodiments, a vapor compression refrigeration cycle can be performed through refrigerant circulation in refrigerant circuit 10. A refrigerant circuit 10 for refrigerant circulation is formed by connecting pipes to the indoor unit 3 and the outdoor unit 2.

[0060] In some embodiments, the refrigerant circuit 10 includes a compressor 11, an outdoor heat exchanger 13, an expansion valve 211, a receiver 14, and an indoor heat exchanger 15. The indoor heat exchanger 15 and the outdoor heat exchanger 13 function as condensers or evaporators. The compressor 11 draws in refrigerant through its suction port and discharges the internally compressed refrigerant to the indoor heat exchanger 15 through its discharge port.

[0061] In some embodiments, the outdoor heat exchanger 13 has a first inlet / outlet for allowing refrigerant to flow through a receiver 14 between the receiver 14 and the suction inlet of the compressor 11, and a second inlet / outlet for allowing refrigerant to flow between the receiver 13 and the expansion valve 211. The outdoor heat exchanger 13 uses heat transfer tubes connected between the second inlet / outlet and the first inlet / outlet of the outdoor heat exchanger 13. Figure 4 (Not shown) The refrigerant flowing in the container exchanges heat with the outdoor air.

[0062] In some embodiments, an expansion valve 211 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 15. The expansion valve 211 functions to expand and depressurize the refrigerant flowing between the outdoor heat exchanger 13 and the indoor heat exchanger 15. The expansion valve 211 is configured to change its opening degree; by decreasing the opening degree, the flow resistance of the refrigerant flowing through the expansion valve 211 increases, and by increasing the opening degree, the flow resistance of the refrigerant flowing through the expansion valve 211 decreases. Such an expansion valve 211 expands and depressurizes the refrigerant flowing from the indoor heat exchanger 15 towards the outdoor heat exchanger 13 during heating operation. Furthermore, even if the states of other components installed in the refrigerant circuit 10 remain unchanged, the flow rate of the refrigerant flowing in the refrigerant circuit 10 will change when the opening degree of the expansion valve 211 changes.

[0063] In some embodiments, the indoor heat exchanger 15 has a second inlet for allowing liquid refrigerant to flow between it and the expansion valve 211, and a first inlet for allowing gaseous refrigerant to flow between it and the outlet of the compressor 11. The indoor heat exchanger 15 uses heat transfer tubes connected between the second inlet and the first inlet of the indoor heat exchanger 15. Figure 4 (Not shown) The refrigerant flowing in the container exchanges heat with the indoor air.

[0064] In some embodiments, a receiver 14 is disposed between the outdoor heat exchanger 13 and the suction inlet of the compressor 11. In the receiver 14, the refrigerant flowing from the outdoor heat exchanger 13 to the compressor 11 is separated into gaseous refrigerant and liquid refrigerant. Furthermore, gaseous refrigerant is mainly supplied from the receiver 14 to the suction inlet of the compressor 11.

[0065] In some embodiments, the outdoor unit 2 further includes an outdoor fan 22 that generates an airflow of outdoor air through the outdoor heat exchanger 13 to promote the flow of air through the heat transfer tubes ( Figure 4The refrigerant flowing in the fan (not shown) exchanges heat with the outdoor air. The outdoor fan 22 is driven by an outdoor fan motor 22A that can change its speed.

[0066] In some embodiments, the indoor unit 3 includes an indoor fan 31 that generates an airflow of indoor air through the indoor heat exchanger 15 to promote the flow of air through the heat transfer tubes. Figure 4 The refrigerant flowing in the fan (not shown) exchanges heat with the indoor air. The indoor fan 31 is driven by an indoor fan motor 31A that can change its speed.

[0067] Figure 5 This is a structural schematic diagram of an indoor unit provided as an embodiment of this application. Figure 5 The indoor unit 3 shown also includes a housing 32, an air filter 33, a horizontal baffle 34, a horizontal baffle 35, and a vertical baffle 36.

[0068] In some embodiments, the housing 32 is a box shape that extends elongatedly in the longitudinal direction (hereinafter also referred to as the left-right direction) and has multiple openings. An intake 37 is provided on the top surface of the housing 32. Driven by the indoor fan 31, indoor air near the intake 37 is drawn into the interior of the housing 32 through the intake 37. The indoor air drawn in from the intake 37 passes through an air filter 33 provided on the top surface of the housing 32, and is then delivered to the indoor fan 31 through the indoor heat exchanger 15.

[0069] In some embodiments, an outlet 38 is formed on the bottom surface of the housing 32. The outlet 38 is connected to the interior of the housing 32 via a continuous vortex flow path 38B from the indoor fan 31. Indoor air drawn in from the intake 37 undergoes heat exchange with the indoor heat exchanger 15 and is then blown out through the outlet 38 to the indoor RS via the vortex flow path 38B. A lower flow path surface 38A is provided on the rear side of the vortex flow path 38B. The cross-sectional shape of the lower flow path surface 38A depicts a curve that moves away from the center of rotation of the indoor fan 31 as it rotates.

[0070] In some embodiments, a horizontal baffle 34 and a horizontal baffle 35 extending longitudinally in the left-right direction are provided on the outlet 38. The horizontal baffle 34 and the horizontal baffle 35 are rotatably mounted on the housing 32. The horizontal baffle 34 and the horizontal baffle 35 are configured such that they can be independently rotated about their respective rotation centers extending in the left and right directions using a horizontal baffle drive motor provided for each horizontal baffle. Furthermore, the horizontal baffle 34 and the horizontal baffle 35 can adjust the vertical direction of the air blown out of the outlet 38, individually or cooperatively.

[0071] In some embodiments, a plurality of vertical baffles 36 having planes intersecting the left-right direction are provided deep within the outlet 38. A vertical baffle drive motor can be used to rotate the vertical baffles 36 left and right about a rotation center extending in the vertical direction (intersecting the left-right direction). These vertical baffles 36 adjust the airflow direction from the outlet 38 left and right.

[0072] Figure 6 This is a schematic diagram illustrating the refrigerant flow direction in an air conditioner according to an exemplary embodiment of this application. Figure 6 As shown.

[0073] In some embodiments, when the air conditioner is in cooling mode, terminals d and c of the four-way valve 114 are connected, and terminals e and s are connected. In this case, the outdoor heat exchanger 13 acts as a condenser, and the indoor heat exchanger 15 acts as an evaporator. Refrigerant in the compressor 11 flows into the outdoor heat exchanger 13 through terminals d and c of the four-way valve 114, releases heat in the outdoor heat exchanger 13, and then flows out of the outdoor unit through the expansion valve 211 and into the indoor unit. The refrigerant flowing into the indoor unit passes through the indoor heat exchanger 15, which acts as an evaporator. The refrigerant absorbs heat at the indoor heat exchanger 15, lowering the water-side temperature. Subsequently, the refrigerant in the indoor unit flows into the gas-liquid separator 113 through terminals e and s of the four-way valve 114, and then flows back to the compressor 11, forming a refrigeration cycle.

[0074] In some embodiments, when the air conditioner is in heating mode, the d-end and e-end of the four-way valve 114 are connected, and the c-end and s-end are connected. In this case, the outdoor heat exchanger 13 acts as the evaporator, and the indoor heat exchanger 15 acts as the condenser. Refrigerant in the compressor 11 flows into the indoor unit through the d-end and e-end of the four-way valve 114, passes through the indoor heat exchanger 15 (which acts as the condenser), and releases heat in the refrigerant. Water flowing from the water side passes through the indoor heat exchanger 15. Because the refrigerant releases heat during this process, heat exchange occurs in the water at the indoor heat exchanger 15, causing the water temperature to rise. After flowing out of the indoor heat exchanger 15, the refrigerant enters the outdoor heat exchanger 13 and absorbs heat. Subsequently, the refrigerant flows through the c-end and s-end of the four-way valve 114 into the gas-liquid separator 113, and then flows back to the compressor 11, forming a heating cycle.

[0075] Figure 7 This is a hardware configuration block diagram of the air conditioner 1 provided in this application according to an exemplary embodiment. Figure 7 As shown, the air conditioner 1 may also include the following two items: a communicator 1002 and a memory 1003.

[0076] In some embodiments, the communicator 1002 is used to establish communication connections with other network entities, such as establishing communication connections with terminal devices. The communicator 1002 may include a radio frequency (RF) module, a cellular module, a wireless fidelity (WIFI) module, and a GPS module, etc. Taking an RF module as an example, the RF module can be used for signal reception and transmission; specifically, it sends received information to the controller 1000 for processing; additionally, it transmits signals generated by the controller 1000. Typically, the RF circuit may include, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier (LNA), a duplexer, etc.

[0077] In some embodiments, the memory 1003 may be used to store software programs and data. The controller 1000 executes various functions of the air conditioner 1 and data processing by running the software programs or data stored in the memory 1003. The memory 1003 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. The memory 1003 stores an operating system that enables the air conditioner 1 to run. In this application, the memory 1003 may store the operating system and various application programs, and may also store code that executes the control method of the air conditioner 1 provided in the embodiments of this application.

[0078] Those skilled in the art will understand that Figure 7 The hardware structure shown does not constitute a limitation on the air conditioner 1. The air conditioner 1 may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0079] In the embodiments shown in this application, controller 1000 refers to a device that can generate operation control signals according to instruction opcodes and timing signals, instructing air conditioner 1 to execute control commands. Exemplarily, controller 1000 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. Controller 1000 can also be other devices with processing functions, such as circuits, devices, or software modules; this application does not impose any limitations on this.

[0080] In addition, the controller 1000 can be used to control the various components inside the air conditioner 1 so that each component can operate to achieve the predetermined functions of the air conditioner 1.

[0081] Figure 8 This is a flowchart illustrating a control method for an air conditioner provided in an embodiment of this application. Figure 8 As shown, the method includes:

[0082] S101. When the air conditioner is started, the controller obtains the operating mode, first suction temperature and first outdoor ambient temperature at the end of the last operation of the air conditioner.

[0083] Optionally, when the air conditioner is started, the controller may periodically acquire the first intake temperature detected by the first temperature sensor and the first outdoor ambient temperature detected by the second temperature sensor for a first preset duration.

[0084] It should be noted that the first preset duration is set and stored in the memory by the air conditioner manufacturer. The first preset duration may vary between different manufacturers, and this application does not limit it.

[0085] The operating mode at the end of the last operation of the air conditioner includes cooling operation mode, heating operation mode, or automatic operation mode.

[0086] It should be noted that when the air conditioner is turned on, if its current operating mode is automatic, and the outdoor ambient temperature is not clearly defined or is in the intermediate temperature range, the air conditioner may operate in a mode that does not meet the user's needs. In this case, it is necessary to comprehensively determine the appropriate operating mode for the air conditioner based on the operating mode of the last run, the first suction temperature, and the first outdoor ambient temperature.

[0087] S102. When the first outdoor ambient temperature is within the preset ambient temperature range and the air conditioner was in automatic operation mode at the end of its last operation, the controller determines the target operation mode of the air conditioner based on the first suction temperature.

[0088] Figure 9 A flowchart illustrating another control method for an air conditioner provided in this application embodiment. Figure 9 As shown, the method includes:

[0089] S102A1, The controller obtains the second suction temperature of the air conditioner.

[0090] In some embodiments, when the first outdoor ambient temperature is within a preset ambient temperature range and the operating mode of the air conditioner at the end of its last operation was automatic operation mode, the second suction temperature of the air conditioner is obtained.

[0091] The second intake temperature is used to indicate the intake temperature at the end of the last operation of the air conditioner.

[0092] S102A2 When the first intake temperature is greater than or equal to the first preset threshold, and the difference between the first intake temperature and the second intake temperature is greater than or equal to the second preset threshold, the target operating mode of the air conditioner is determined to be the cooling operating mode.

[0093] It should be noted that the preset ambient temperature range, the first preset threshold, and the second preset threshold are set and stored in the memory by the air conditioner manufacturer. The preset ambient temperature range, the first preset threshold, and the second preset threshold may vary between different manufacturers, and this application does not limit them.

[0094] Optionally, the preset ambient temperature range can be (X, Y), the first preset threshold can be 0, and the second preset threshold can be W.

[0095] Optionally, when the first outdoor ambient temperature T a1 Within the range (X, Y), and when the air conditioner's last operation ended in automatic mode, if the first suction temperature T i1 Greater than or equal to 0, and the first inhalation temperature and the second inhalation temperature T i2 The difference between them |ΔT i1 If W is greater than or equal to W, the target operating mode of the air conditioner is determined to be the cooling operating mode.

[0096] For example, when X < T a1 If T < Y and the air conditioner's operating mode was automatic at the end of its last run, then... i1 ≥0 and |ΔT i1 |≥W, the target operating mode of the air conditioner is determined to be the cooling operating mode.

[0097] S102A3, when the first outdoor ambient temperature is within the preset ambient temperature range and the operating mode of the air conditioner at the end of the last operation was automatic operation mode, when the first suction temperature is less than the first preset threshold, the target operating mode of the air conditioner is determined to be heating operation mode.

[0098] Optionally, when the first outdoor ambient temperature T a1 Within the range (X, Y), and when the air conditioner's last operation ended in automatic mode, if the first suction temperature T i1 If the value is less than 0, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0099] For example, when X < T a1 If T < Y and the air conditioner's operating mode was automatic at the end of its last run, then... i1<0, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0100] S102A4. When the first outdoor ambient temperature is within the preset ambient temperature range and the operating mode of the air conditioner at the end of the last operation is automatic operation mode, when the difference between the first suction temperature and the second suction temperature is less than the second preset threshold, the state of the four-way valve at the end of the last operation of the air conditioner is obtained; the target operating mode of the air conditioner is determined based on the state of the four-way valve.

[0101] The four-way valve can be in either an open or closed state.

[0102] Optionally, when the first outdoor ambient temperature T a1 Within the range of (X, Y), and when the operating mode of the air conditioner at the end of the last operation was automatic, if the difference between the first suction temperature and the second suction temperature is less than the second preset threshold, the state of the four-way valve at the end of the last operation of the air conditioner is obtained.

[0103] For example, when X < T a1 <Y and the air conditioner's operating mode at the end of its last run was automatic, if |ΔT i1 |<W, retrieves the status of the four-way valve at the end of the last operation of the air conditioner.

[0104] Figure 10 A flowchart illustrating another control method for an air conditioner provided in this application embodiment. Figure 10 As shown, the method includes:

[0105] S102A41, The controller obtains the status of the four-way valve at the end of the last operation of the air conditioner.

[0106] S102A42. When the four-way valve is in the closed state, determine the target operating mode of the air conditioner as the cooling operating mode.

[0107] S102A43. When the four-way valve is in the open state, if the first suction temperature is less than the first preset threshold, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0108] Optionally, when the first outdoor ambient temperature is within the preset ambient temperature range, and the air conditioner's operating mode at the end of its last operation was automatic, if the difference between the first suction temperature and the second suction temperature is less than the second preset threshold, the four-way valve is in the open state and T... i1 <0, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0109] For example, when X < T a1<Y and the air conditioner's operating mode at the end of its last run was automatic, if |ΔT i1 |<W, the four-way valve is in the open state and T i1 <0, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0110] S102A44. When the four-way valve is in the open state, if the first suction temperature is greater than or equal to the first preset threshold, the controller controls the air conditioner to operate in heating mode.

[0111] S102A45. When the duration of the air conditioner's operation in heating mode reaches the first preset duration, the controller controls the compressor to operate at the target operating frequency for the first preset duration.

[0112] It should be noted that the preset duration is set by the air conditioner manufacturer and stored in the memory. The preset duration may vary between different manufacturers, and this application does not limit it.

[0113] Optionally, the preset duration can be T minutes.

[0114] The target operating frequency is determined based on the first inhalation temperature.

[0115] Optionally, the target operating frequency of the compressor can be calculated using formula (1), as shown in formula (1):

[0116] Hz n =Hz n-1 -|ΔT i |*a Formula (1)

[0117] Among them, Hz n-1 Let be the compressor frequency when the air conditioner starts up, and 'a' be a constant.

[0118] It should be noted that 'a' is a value set by the air conditioner manufacturer and stored in the memory. The value of 'a' can vary between different manufacturers, and this application does not limit it.

[0119] For example, when T i1 When the temperature is ≥0, the controller controls the air conditioner to operate in heating mode for T minutes, and then determines the target operating frequency (Hz) of the compressor based on the first suction temperature. n .

[0120] S102A46. When the compressor has been running at the target operating frequency for a period of time that reaches the first preset duration, the controller obtains the third suction temperature.

[0121] S102A47. When the difference between the first intake temperature and the third intake temperature is greater than or equal to the third preset threshold, the controller determines that the target operating mode of the air conditioner is the cooling operating mode.

[0122] It should be noted that the third preset threshold is set and stored in the memory by the air conditioner manufacturer. The third preset threshold can vary between different manufacturers, and this application does not limit it.

[0123] Optionally, the third preset threshold can be V.

[0124] Optionally, when the compressor operates at Hz n After running at a frequency of T minutes, if the first intake temperature T i1 T between the third inhalation temperature i2 The difference |ΔT i2 When the value is greater than or equal to the third preset threshold V, the target operating mode of the air conditioner is determined to be the cooling operating mode.

[0125] For example, when the compressor operates at Hz n After running at a frequency of T minutes, if |ΔT i2 If |≥V, the target operating mode of the air conditioner is determined to be the cooling operating mode.

[0126] S102A48, If the first inhalation temperature T i1 Between the third inhalation temperature T i2 The difference |ΔT i2 When the value is less than the third preset threshold V, the controller determines that the target operating mode of the air conditioner is the heating operating mode.

[0127] For example, when the compressor operates at Hz n After running at a frequency of T minutes, if |ΔT i2 If | < V, the target operating mode of the air conditioner is determined to be the heating operating mode.

[0128] Figure 11 A flowchart illustrating another control method for an air conditioner provided in this application embodiment. Figure 11 As shown, the method includes:

[0129] S102B1, The controller obtains the second outdoor ambient temperature of the air conditioner.

[0130] S102B2 When the first outdoor ambient temperature is within the preset ambient temperature range, and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is greater than or equal to the fourth preset threshold, if the operating mode of the air conditioner at the end of the last operation was the heating operating mode, the controller determines that the target operating mode of the air conditioner is the cooling operating mode.

[0131] The second outdoor ambient temperature is used to indicate the outdoor ambient temperature at the end of the last operation of the air conditioner.

[0132] It should be noted that the fourth preset threshold is set and stored in the memory by the air conditioner manufacturer. The fourth preset threshold may vary between different manufacturers, and this application does not limit it.

[0133] Optionally, the fourth preset threshold can be Z.

[0134] For example, when X < T a1 <Y and the first outdoor ambient temperature T a1 With the second outdoor ambient temperature T a2 The difference between them |ΔT a |greater than or equal to the fourth preset threshold Z, i.e., |ΔT a When |≥Z, if the air conditioner's operating mode at the end of the last operation was heating mode, the controller determines the air conditioner's target operating mode as cooling mode.

[0135] S102B3 When the first outdoor ambient temperature is within the preset ambient temperature range, and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is greater than or equal to the fourth preset threshold, if the operating mode of the air conditioner at the end of the last operation was the cooling operating mode, the controller determines that the target operating mode of the air conditioner is the heating operating mode.

[0136] For example, when X < T a1 <Y and|ΔT a When |≥Z, if the air conditioner's operating mode at the end of the last operation was cooling mode, the controller determines the air conditioner's target operating mode as heating mode.

[0137] S102B4 When the first outdoor ambient temperature is within the preset ambient temperature range, and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is less than the fourth preset threshold, if the operating mode of the air conditioner at the end of the last operation was the heating operating mode, the controller determines that the target operating mode of the air conditioner is the heating operating mode.

[0138] For example, when X < T a1 <Y and|ΔT a When | < Z, if the air conditioner's operating mode at the end of the last operation was heating mode, the controller determines the air conditioner's target operating mode as heating mode.

[0139] S102B5 When the first outdoor ambient temperature is within the preset ambient temperature range, and the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is less than the fourth preset threshold, if the operating mode of the air conditioner at the end of the last operation was the cooling operation mode, the controller determines that the target operating mode of the air conditioner is the cooling operation mode.

[0140] For example, when X < T a1 <Y and|ΔTa When | < Z, if the air conditioner's operating mode at the end of its last operation was cooling mode, the controller determines the air conditioner's target operating mode as cooling mode.

[0141] Figure 12 A flowchart illustrating another control method for an air conditioner provided in this application embodiment. Figure 12 As shown, the method includes:

[0142] S102C1, the controller obtains the first outdoor ambient temperature.

[0143] Optionally, the controller can obtain the first outdoor ambient temperature via a second temperature sensor.

[0144] S102C2. When the first outdoor ambient temperature is greater than or equal to the maximum temperature value in the preset ambient temperature range, the controller determines that the target operating mode of the air conditioner is the cooling operating mode.

[0145] For example, when T a1 When ≥Y, the controller determines the target operating mode of the air conditioner as the cooling operating mode.

[0146] S102C3. When the first outdoor ambient temperature is less than or equal to the minimum temperature value in the preset ambient temperature range, the controller determines that the target operating mode of the air conditioner is the heating operating mode.

[0147] For example, when T a1 When the value is less than X, the controller determines that the target operating mode of the air conditioner is the cooling operating mode.

[0148] S103, The controller controls the air conditioner to operate in the target operating mode.

[0149] In some embodiments, once the target operating mode of the air conditioner is determined, the controller controls the air conditioner to operate in the target operating mode.

[0150] For example, when the target operating mode of the air conditioner is determined to be the cooling operating mode, the controller controls the air conditioner to operate in the cooling operating mode.

[0151] For example, when the target operating mode of the air conditioner is determined to be the heating operating mode, the controller controls the air conditioner to operate in the heating operating mode.

[0152] The technical solution provided in this application provides at least the following beneficial effects: This technical solution uses parameters such as the operating mode at the end of the last operation of the air conditioner, the suction temperature, and the difference between the suction temperature and the previous temperature, to determine the target operating mode of the air conditioner using multiple judgment methods. This judgment method is more accurate and better reflects the actual needs of the user. Simultaneously, by controlling the air conditioner to operate in the target operating mode, the air conditioner can run in the most suitable mode under different conditions, making the indoor temperature more comfortable and improving the user experience.

[0153] In some embodiments, the above method can also be achieved through methods such as Figure 13 The method shown is implemented as follows. Figure 13 As shown, the method includes:

[0154] S1, Air conditioner is in automatic operation mode.

[0155] S2, the outdoor ambient temperature T when the air conditioner is started this time. a1 When the value is ≤X, the controller controls the air conditioner to operate in heating mode.

[0156] S3, the outdoor ambient temperature T when the air conditioner is started this time. a1 When ≥Y, the controller controls the air conditioner to operate in cooling mode.

[0157] S4. When the outdoor ambient temperature X < T when the air conditioner is started this time. a1 When <Y, retrieve the operating mode at the end of the last run of the air conditioner.

[0158] S5. If the air conditioner's operating mode was cooling or heating when it last ended, and the difference between the first and second outdoor ambient temperatures is |ΔT a When | < Z, the controller controls the air conditioner to operate in the same mode as when the air conditioner last ended.

[0159] For example, if the air conditioner's operating mode was cooling mode when it last finished operating and |ΔT a |<Z, the controller controls the air conditioner's cooling operation mode.

[0160] For example, if the air conditioner's operating mode was heating mode at the end of its last operation and |ΔT a |<Z, the controller controls the air conditioner's heating mode.

[0161] S6. If the air conditioner was in cooling or heating mode at the end of its last operation, and the difference between the outdoor ambient temperature at the end of the last operation and the outdoor ambient temperature at the start of this operation is |ΔT aWhen |≥Z, the controller controls the air conditioner to operate in the opposite mode to the operating mode at the end of the last operation.

[0162] For example, if the operating mode was cooling operation mode at the end of the last run and |ΔT a |≥Z, the controller controls the air conditioner's heating mode.

[0163] For example, if the operating mode was heating mode at the end of the last run and |ΔT a |≥Z, the controller controls the air conditioner to operate in cooling mode.

[0164] S7. If the air conditioner was in automatic mode when it last finished operating, when the first suction temperature T i1 ≥0, and the first inhalation temperature and the second inhalation temperature T i2 The difference between them |ΔT i1 When |≥W, the controller controls the air conditioner to operate in cooling mode.

[0165] S8. If the air conditioner was in automatic mode when it last finished running, when T i1 When the value is less than 0, the controller controls the air conditioner to operate in heating mode.

[0166] S9. If the air conditioner was in automatic mode when it last finished running, when |ΔT i1 When | < W, obtain the status of the four-way valve at the end of the last operation of the air conditioner.

[0167] S10. If the four-way valve is in the open state, the controller controls the air conditioner to operate in cooling mode.

[0168] S11. If the four-way valve is in the closed state, when T i1 When the value is less than 0, the controller controls the air conditioner to operate in heating mode.

[0169] S12. If the four-way valve is in the closed state, when T i1 When the value is ≥0, after the air conditioner has been running for T minutes, adjust the compressor's operating frequency to Hz. n The compressor operates at Hz n The frequency runs for T minutes.

[0170] Optional, Hz n It can be calculated using the formula (1) above, and will not be repeated here.

[0171] S13, when the compressor operates at Hz n The difference between the intake temperature after T minutes of operation and the intake temperature at the start of this air conditioner operation |ΔT i2When | < V, the controller controls the air conditioner to operate in cooling mode.

[0172] S14, when the compressor operates at Hz n After running at a frequency of T minutes, the difference between the current intake temperature and the intake temperature at the time of this air conditioner startup is |ΔT|. i2 When |≥V, the controller controls the air conditioner to operate in heating mode.

[0173] This invention also provides a computer-readable storage medium including computer-executable instructions that, when executed on a computer, cause the computer to perform the method provided in the above embodiments.

[0174] This invention also provides a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can implement the methods provided in the above embodiments.

[0175] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this invention can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0176] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0177] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely exemplary; for instance, the division of modules or units is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed between each other may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate; components shown as units may be one physical unit or multiple physical units, i.e., they may be located in one place or distributed in multiple different places. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0178] Furthermore, the functional units in the various embodiments of this invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0179] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An air conditioner, characterized in that, include: Outdoor unit, including outdoor heat exchanger; The indoor unit includes an indoor heat exchanger; wherein, the outdoor heat exchanger and the indoor heat exchanger, one functions as a condenser and the other as an evaporator; The refrigerant circulation loop is used to control the circulation of refrigerant in the circuit consisting of the compressor, condenser, expansion valve, four-way valve, and evaporator. A compressor is used to compress refrigerant gas and discharge it to the condenser. A four-way valve is used to control the refrigerant flow direction in the refrigerant circulation loop; The first temperature sensor is located at the air intake of the indoor unit and is used to detect the intake temperature. The second temperature sensor is installed in the outdoor unit to detect the outdoor ambient temperature; The controller is configured as follows: When the air conditioner is started, the operating mode at the end of the last operation of the air conditioner, the first suction temperature detected by the first temperature sensor, and the first outdoor ambient temperature detected by the second temperature sensor are obtained. When the first outdoor ambient temperature is within a preset ambient temperature range, and the air conditioner was in automatic operation mode at the end of its last operation, the second intake temperature detected by the air conditioner through the first temperature sensor is obtained; the second intake temperature is used to indicate the intake temperature at the end of the last operation of the air conditioner. When the first intake temperature is greater than or equal to the first preset threshold, and the difference between the first intake temperature and the second intake temperature is greater than or equal to the second preset threshold, the target operating mode of the air conditioner is determined to be the cooling operating mode. Control the air conditioner to operate in the target operating mode.

2. The air conditioner according to claim 1, characterized in that, The controller is configured to determine the target operating mode of the air conditioner based on the first intake temperature, specifically configured as follows: When the first intake temperature is less than the first preset threshold, the target operating mode of the air conditioner is determined to be the heating operating mode.

3. The air conditioner according to claim 1, characterized in that, The controller is configured to determine the target operating mode of the air conditioner based on the first intake temperature, specifically configured as follows: When the difference between the first intake temperature and the second intake temperature is less than a second preset threshold, the state of the four-way valve at the end of the last operation of the air conditioner is obtained; wherein, the state of the four-way valve includes an open state or a closed state; The target operating mode of the air conditioner is determined based on the state of the four-way valve.

4. The air conditioner according to claim 3, characterized in that, The controller is configured to determine the target operating mode of the air conditioner based on the state of the four-way valve, specifically configured as follows: When the four-way valve is in the closed state, the target operating mode of the air conditioner is determined to be the cooling operating mode; When the four-way valve is in the open state, if the first intake temperature is less than the first preset threshold, the target operating mode of the air conditioner is determined to be the heating operating mode.

5. The air conditioner according to claim 3, characterized in that, The controller is configured to determine the target operating mode of the air conditioner based on the state of the four-way valve, specifically configured as follows: When the four-way valve is in the open state, if the first suction temperature is greater than or equal to the first preset threshold, the air conditioner is controlled to operate in heating mode. When the duration of the air conditioner operating in the heating mode reaches a first preset duration, the compressor is controlled to operate at a target operating frequency, the target operating mode being determined based on the first suction temperature; When the compressor operates at the target operating frequency for a period of time that reaches the first preset duration, the third suction temperature detected by the first temperature sensor is obtained; If the difference between the first intake temperature and the third intake temperature is greater than or equal to a third preset threshold, then the target operating mode of the air conditioner is determined to be the cooling operating mode.

6. The air conditioner according to claim 1, characterized in that, The controller is also configured to: When the first outdoor ambient temperature is within a preset ambient temperature range, and the air conditioner was in cooling or heating mode at the end of its last operation, the second outdoor ambient temperature of the air conditioner is obtained; the second outdoor ambient temperature is used to indicate the outdoor ambient temperature at the end of the last operation of the air conditioner. When the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is greater than or equal to the fourth preset threshold, if the operating mode of the air conditioner at the end of the last operation was the heating operating mode, the target operating mode of the air conditioner is determined to be the cooling operating mode. or, If the air conditioner was in cooling mode when it last ended, the target operating mode of the air conditioner is determined to be heating mode. When the first outdoor ambient temperature is within a preset ambient temperature range, and the absolute value of the difference between the first outdoor ambient temperature and the second outdoor ambient temperature is less than a fourth preset threshold, if the operating mode at the end of the last operation of the air conditioner was the heating operating mode, then the target operating mode of the air conditioner is determined to be the heating operating mode; or... If the air conditioner was in cooling mode when it last ended, then the target operating mode of the air conditioner is determined to be cooling mode.

7. The air conditioner according to claim 1, characterized in that, The controller is also configured to: When the first outdoor ambient temperature is greater than or equal to the maximum temperature value in the preset ambient temperature range, the target operating mode of the air conditioner is determined to be the cooling operating mode. Alternatively, when the first outdoor ambient temperature is less than or equal to the minimum temperature value in the preset ambient temperature range, the target operating mode of the air conditioner is determined to be the heating operating mode.

8. A control method for an air conditioner, characterized in that, The method includes: When the air conditioner is started, the operating mode, first suction temperature and first outdoor ambient temperature at the end of the last operation of the air conditioner are obtained. When the first outdoor ambient temperature is within a preset ambient temperature range, and the air conditioner was in automatic operation mode at the end of its last operation, the second intake temperature detected by the air conditioner through the first temperature sensor is obtained; the second intake temperature is used to indicate the intake temperature at the end of the last operation of the air conditioner. When the first intake temperature is greater than or equal to the first preset threshold, and the difference between the first intake temperature and the second intake temperature is greater than or equal to the second preset threshold, the target operating mode of the air conditioner is determined to be the cooling operating mode. Control the air conditioner to operate in the target operating mode.

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