Air conditioner and control method thereof

Abstract

The invention discloses an air conditioner and a control method thereof.The air conditioner comprises a refrigerant circulation loop, an electronic expansion valve, an indoor fan, an outdoor fan, an outdoor environment temperature sensor, an indoor environment temperature sensor, an indoor coil pipe temperature sensor, an exhaust pressure sensor and a controller; the current corresponding outdoor environment temperature is obtained, when the outdoor environment temperature exceeds a first preset temperature threshold value, the air conditioner is controlled to execute a refrigeration control strategy under the high-temperature environment, and the difference value between the indoor environment temperature and the simulated air outlet temperature is reduced by adjusting the operation states of a compressor and an outdoor fan; the purpose of improving the air outlet temperature of the air conditioner is achieved, so that the actual requirement of a user can be met, and the somatosensory comfort of the user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner and a control method thereof. Background Art

[0002] In a high-temperature environment, the user's demand for the refrigeration of the air conditioner and the sensitivity to the outlet air temperature will increase significantly. Therefore, the lower the outlet air temperature of the air conditioner, the greater the temperature difference formed with the environment, the more direct the human body sensation, and the stronger the comfort.

[0003] However, a high-temperature environment will cause an increase in the load of the air conditioner and a more severe working environment. This may not only reduce the refrigeration capacity of the air conditioner, but also cause the current and system pressure of the air conditioner to be limited, so that its operating frequency cannot be too high. At the same time, the operating frequency and capacity demand of the air conditioner are usually related to the air volume setting of its indoor unit. The smaller the air volume, the lower its operating frequency and capacity demand.

[0004] In the related art, during the design stage of the air conditioner, it is based on a limited number of standard working conditions, and these standard working conditions cannot fully reflect the actual user's usage environment and space. In actual use, the parameters set under the standard working conditions cannot exert the best performance. Therefore, in a high-temperature environment, the cooling capacity output of the air conditioner is often difficult to meet the user's body sensation requirements, and the outlet air temperature of the air conditioner cannot be improved, thus unable to improve the user's body sensation comfort. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. For this purpose, the object of the present invention is to provide an air conditioner and a control method thereof.

[0006] An air conditioner proposed by the present invention includes: a refrigerant circulation circuit that enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an expansion valve, and an evaporator, where one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an electronic expansion valve provided between the condenser and the evaporator, and the electronic expansion valve is configured to increase the flow resistance of the refrigerant passing through the electronic expansion valve when its opening degree decreases, and decrease the flow resistance of the refrigerant passing through the electronic expansion valve when its opening degree increases; an indoor fan for driving indoor air to pass through the indoor heat exchanger by rotation so that the refrigerant exchanges heat with the indoor air; an outdoor fan for driving outdoor air to pass through the outdoor heat exchanger by rotation so that the refrigerant exchanges heat with the outdoor air; an outdoor ambient temperature sensor for detecting the outdoor ambient temperature; an indoor ambient temperature sensor for detecting the indoor ambient temperature; an indoor coil temperature sensor for detecting the indoor coil temperature; an exhaust pressure sensor for detecting the exhaust pressure of the compressor; a controller, and the controller is configured to: when the air conditioner is turned on for refrigeration operation, obtain the current corresponding outdoor ambient temperature, and when the outdoor ambient temperature exceeds a first preset temperature threshold, control the air conditioner to execute a refrigeration control strategy under high temperature environment; wherein, when executing the refrigeration control strategy under high temperature environment, the controller is configured to: determine the simulated air outlet temperature of the air conditioner according to the indoor coil temperature; determine the difference between the indoor ambient temperature and the simulated air outlet temperature; when the difference reaches or exceeds a first preset difference threshold, control the air conditioner to maintain the current operating state; when the difference does not reach the first preset difference threshold, determine a first temperature correction coefficient according to the difference, and obtain the exhaust pressure of the compressor; when the exhaust pressure does not reach a preset pressure threshold, obtain the operating frequency of the compressor, and control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to make it decrease; when the exhaust pressure reaches or exceeds the preset pressure threshold, then obtain the rotational speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to make it decrease.

[0007] In addition, the air conditioner according to the embodiment of the present invention may further have the following additional technical features:

[0008] Further, when determining the first temperature correction coefficient according to the difference, the controller is configured to: determine the corresponding first temperature correction coefficient according to the temperature range where the difference is located, where different temperature ranges correspond to different first temperature correction coefficients, and different temperature ranges and their corresponding first temperature correction coefficients are stored in the air conditioner, and the magnitude of the temperature difference is inversely proportional to the value of the first temperature correction coefficient.

[0009] Further, when determining the simulated air outlet temperature of the air conditioner according to the indoor coil temperature, the controller is configured to perform the following operations:

[0010] T1 = K1 * T3 + B;

[0011] where T1 is the simulated air outlet temperature, K1 is a preset second temperature correction coefficient, T3 is the indoor coil temperature, and B is a preset intercept.

[0012] Further, when controlling the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient, the controller is configured to: when the operating frequency of the compressor does not reach the preset frequency upper limit threshold, increase the operating frequency of the compressor according to the first temperature correction coefficient, and control the compressor to operate at the increased operating frequency until after operating for a first preset time, return to the step of determining the difference between the indoor environment temperature and the simulated air outlet temperature; when the operating frequency of the compressor reaches or exceeds the preset frequency upper limit threshold, obtain the rotational speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient.

[0013] Further, when increasing the operating frequency of the compressor according to the first temperature correction coefficient, the controller is configured to: when the increased operating frequency exceeds the preset frequency upper limit threshold, limit the increased operating frequency to the preset frequency upper limit threshold.

[0014] Further, when controlling the compressor to operate at the increased operating frequency, the controller is further configured to: determine the exhaust superheat degree corresponding to the increased operating frequency, and control the opening degree of the electronic expansion valve according to the exhaust superheat degree.

[0015] Further, when controlling the operating state of the outdoor fan according to the rotation speed of the outdoor fan and the first temperature correction coefficient, the controller is configured to: when the rotation speed of the outdoor fan does not reach the preset rotation speed upper limit threshold, increase the rotation speed of the outdoor fan according to the first temperature correction coefficient, and control the outdoor fan to operate at the increased rotation speed until after operating for a second preset time, return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature; when the rotation speed of the outdoor fan reaches or exceeds the preset rotation speed upper limit threshold, obtain the rotation speed of the indoor fan, and control the operating state of the indoor fan according to the rotation speed of the indoor fan and the first temperature correction coefficient.

[0016] Further, when controlling the outdoor fan to operate at the increased rotation speed, the controller is configured to: when the increased rotation speed exceeds the preset rotation speed upper limit threshold, limit the increased rotation speed to the preset rotation speed upper limit threshold.

[0017] Further, when controlling the operating state of the indoor fan according to the rotation speed of the indoor fan and the first temperature correction coefficient, the controller is configured to: when the rotation speed of the indoor fan exceeds the preset rotation speed lower limit threshold, decrease the rotation speed of the indoor fan according to the first temperature correction coefficient, and control the indoor fan to operate at the decreased rotation speed until after operating for a third preset time, return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature; when the rotation speed of the indoor fan does not exceed the preset rotation speed lower limit threshold, control the air conditioner to maintain the current operating state.

[0018] Further, when controlling the indoor fan to operate at the decreased rotation speed, the controller is configured to: when the decreased rotation speed exceeds the preset rotation speed lower limit threshold, increase the decreased rotation speed to the preset rotation speed lower limit threshold.

[0019] According to the air conditioner of the embodiment of the present invention, when the air conditioner starts cooling operation, by comparing the current corresponding outdoor ambient temperature with the first preset temperature threshold, when the outdoor ambient temperature exceeds the first preset temperature threshold, the air conditioner is controlled to execute the cooling control strategy in a high-temperature environment, that is, the simulated air outlet temperature and the indoor ambient temperature of the air conditioner are obtained, and the difference between the indoor ambient temperature and the simulated air outlet temperature is determined. According to the difference, a first temperature correction coefficient is determined. When the exhaust pressure does not reach the preset pressure threshold, the operating state of the compressor is controlled according to the operating frequency of the compressor and the first temperature correction coefficient. When the exhaust pressure reaches or exceeds the preset pressure threshold, the operating state of the outdoor fan is controlled according to the rotational speed of the outdoor fan and the first temperature correction coefficient. By adjusting the operating states of the compressor and the outdoor fan, the difference between the indoor ambient temperature and the simulated air outlet temperature is reduced, so as to achieve the purpose of improving the air outlet temperature of the air conditioner, thereby meeting the actual needs of users and improving the user's body feeling comfort level.

[0020] In view of the above problems, the present invention also proposes a control method for an air conditioner, which is used for the air conditioner described in any of the above embodiments. The method includes the following steps: when the air conditioner starts cooling operation, obtain the current corresponding outdoor ambient temperature. When the outdoor ambient temperature exceeds the first preset temperature threshold, control the air conditioner to execute the cooling control strategy in a high-temperature environment; wherein, when executing the cooling control strategy in a high-temperature environment, it includes: determining the simulated air outlet temperature of the air conditioner according to the indoor coil temperature; determining the difference between the indoor ambient temperature and the simulated air outlet temperature; when the difference reaches or exceeds the first preset difference threshold, control the air conditioner to maintain the current operating state; when the difference does not reach the first preset difference threshold, determine a first temperature correction coefficient according to the difference, and obtain the exhaust pressure of the compressor; when the exhaust pressure does not reach the preset pressure threshold, obtain the operating frequency of the compressor, and control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature; when the exhaust pressure reaches or exceeds the preset pressure threshold, obtain the rotational speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature.

[0021] According to the control method of an air conditioner according to an embodiment of the present invention, when the air conditioner is turned on for cooling operation, by comparing the current corresponding outdoor ambient temperature with a first preset temperature threshold, when the outdoor ambient temperature exceeds the first preset temperature threshold, the air conditioner is controlled to execute a cooling control strategy in a high-temperature environment, that is, the simulated air outlet temperature and the indoor ambient temperature of the air conditioner are obtained, and the difference between the indoor ambient temperature and the simulated air outlet temperature is determined. A first temperature correction coefficient is determined according to the difference. When the exhaust pressure does not reach the preset pressure threshold, the operating state of the compressor is controlled according to the operating frequency of the compressor and the first temperature correction coefficient. When the exhaust pressure reaches or exceeds the preset pressure threshold, the operating state of the outdoor fan is controlled according to the rotational speed of the outdoor fan and the first temperature correction coefficient. By adjusting the operating states of the compressor and the outdoor fan, the difference between the indoor ambient temperature and the simulated air outlet temperature is reduced, so as to achieve the purpose of improving the air outlet temperature of the air conditioner, thereby meeting the actual needs of users and improving the user's body feeling comfort.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a controller according to an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;

[0027] Figure 4 is a flowchart of a control method of an air conditioner according to an embodiment of the present invention;

[0028] Figure 5 is a general flowchart of a control method of an air conditioner according to an embodiment of the present invention;

[0029] Figure 6 is a flowchart of controlling the operating state of a compressor according to the operating frequency of the compressor and the first temperature correction coefficient according to an embodiment of the present invention;

[0030] Figure 7 is a flowchart of controlling the operating state of an outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient according to an embodiment of the present invention;

[0031] Figure 8 It is a flowchart for controlling the operating state of an indoor fan according to the rotational speed of the indoor fan and a first temperature correction coefficient according to an embodiment of the present invention. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0034] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0035] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0036] An embodiment of the present invention provides an air conditioner 10, referring to Figure 1 , the air conditioner 10 includes a refrigeration system for exchanging heat with indoor air to meet the refrigeration or heating requirements.

[0037] The refrigeration system includes a compressor, a condenser, an electronic expansion valve 12, and an evaporator. In the present invention, the air conditioner 10 performs the refrigeration cycle of the air conditioner 10 by using the compressor, the condenser, the electronic expansion valve 12, and the evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0038] The compressor compresses the refrigerant gas in a high-temperature and high-pressure 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.

[0039] The electronic expansion valve 12 expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the electronic expansion valve 12 and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor.

[0040] The evaporator can achieve a refrigeration effect by performing a heat exchange with the material to be cooled by utilizing the latent heat of evaporation of the refrigerant. Throughout the cycle, the air conditioner 10 can adjust the temperature of the indoor space.

[0041] The outdoor unit 2 of the air conditioner 10 refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit 1 of the air conditioner 10 includes an indoor heat exchanger, and the electronic expansion valve 12 can be provided in the indoor unit 1 or the outdoor unit 2.

[0042] The indoor heat exchanger and the outdoor heat exchanger serve as a condenser or an evaporator. When the indoor heat exchanger serves as a condenser, the air conditioner 10 serves as a heater in the heating mode. When the indoor heat exchanger serves as an evaporator, the air conditioner 10 serves as a cooler in the cooling mode.

[0043] The air conditioner 10 in the present invention includes an indoor unit 1 and an outdoor unit 2. The indoor unit 1 and the outdoor unit 2 can be set as an integrated machine or a split machine. The indoor unit 1 can be set as a wall-mounted type, a ceiling type, a duct type, etc., and the indoor unit 1 is installed on the top or ceiling of the indoor room.

[0044] Refer to Figure 1 , taking the indoor wall-mounted unit as an example, the indoor wall-mounted unit is usually installed at positions such as the indoor wall surface. Again, for example, the indoor cabinet unit (not shown in the figure) is also a form of the indoor unit 1 of the indoor unit 1.

[0045] Taking the split machine as an example, the air conditioner 10 includes an indoor unit 1 and an outdoor unit 2. Among them, the outdoor unit 2 is usually set outdoors for heat exchange with the indoor environment.

[0046] In addition, as shown in the figure, the air conditioner 10 is equipped with a controller 71 to control the operation of various components inside the air conditioner 10, so that each component of the air conditioner 10 operates to achieve various predetermined functions of the air conditioner 10. Among them, a control device 200 is also attached to the air conditioner 10. Exemplarily, the control device 200 is specifically set as a remote controller, and the remote controller has a function of communicating with the controller 71 using, for example, infrared rays or other communication methods. The remote controller is used for users to perform various controls on the air conditioner 10, realizing the interaction between the user and the air conditioner 10.

[0047] In the embodiment of the present invention, the indoor unit 1 of the air conditioner 10 is installed at the top or upper part of the room. Generally speaking, the installation height of the indoor unit 1 is higher than the user's activity area. The indoor unit 1 includes an air return opening and an air outlet communicating with the room. Indoor air enters the indoor unit 1 through the air return opening and flows back into the room through the air outlet.

[0048] In the refrigerant circulation circuit of the present invention, the refrigerant circulates in a circuit composed of a compressor, a condenser, an electronic expansion valve 12, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger. The indoor heat exchanger is used to exchange heat with the air inside the indoor unit 1, and the outdoor heat exchanger of the outdoor unit 2 is used to exchange heat with the air inside the outdoor unit 2, so as to meet the cooling or heating requirements of the air conditioner 10.

[0049] The indoor unit 1 also includes an indoor fan. The indoor fan is arranged near the air return opening or the air outlet of the indoor heat exchanger and is used to send the heat-exchanged air into the room. The indoor fan includes multiple gears and is used to change the air outlet speed of the air flow at the air outlet.

[0050] An air deflector is arranged at the position of the air outlet. By changing the relative rotation angle between the air deflector and the air outlet, the outflow direction of the air flowing through the air outlet is adjusted, thereby affecting the air temperature stratification in the room.

[0051] In the embodiment shown in the present invention, the air conditioner 10 further includes a controller 71. The controller 71 refers to a device that can generate an operation control signal according to the instruction operation code and the timing signal to instruct the air conditioner 10 to execute a control instruction. For example, in response to the power-on or power-off instruction issued by the user received, the controller 71 can perform operations related to the object selected by the power-on or power-off instruction.

[0052] The embodiment of the present invention also provides a schematic diagram of the hardware structure of the controller 71, as Figure 2 shown. The controller 71 includes a processor 83. Optionally, it further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82, and the communication interface 84 are connected through a bus 81.

[0053] The processor 83 can be a central processing unit (CPU), a general-purpose processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 718, a programmable logic device (PLD), or any combination thereof. The processor 83 can also be any other device with processing capabilities, such as a circuit, a device, or a software module. The processor 83 can also include multiple CPUs, and the processor 83 can be a single-core (single CPU) processor 83 or a multi-core (multi CPU) processor 83. The processor 83 here can refer to one or more devices, circuits, or processing cores for processing data (such as computer program instructions).

[0054] The memory 82 can be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and instructions, a random access memory 82 (RAM), or other types of dynamic storage devices that can store information and instructions. It can also be an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CD ROM), or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), a magnetic disk storage medium, or any other medium that can be used to carry or store the desired program code in the form of instructions or data structures and can be accessed by a computer. The embodiments of the present invention do not impose any restrictions on this. The memory 82 can exist independently or be integrated with the processor 83. Among them, the memory 82 can contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, thereby implementing the control method of the air conditioner provided by the embodiments of the present invention.

[0055] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 84 can be a module, a circuit, a transceiver, or any device capable of implementing communication.

[0056] The bus 81 can be a peripheral component interconnect (PCI) bus 81, an extended industry standard architecture (EISA) bus 81, or the like. The bus 81 can be divided into an address bus 81, a data bus 81, a control bus 81, etc. For ease of representation, Figure 2 it is only represented by a thick line in the figure, but it does not mean that there is only one bus 81 or one type of bus 81.

[0057] The following refers to Figures 3 - 8 describe an air conditioner and its control method according to an embodiment of the present invention.

[0058] Figure 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention. As Figure 3 shown, an air conditioner 10 includes: a refrigerant circulation circuit 11, an electronic expansion valve 12, an indoor fan 13, an outdoor fan 14, an outdoor ambient temperature sensor 15, an indoor ambient temperature sensor 16, an indoor coil temperature sensor 17, a discharge pressure sensor 18, and a controller 71.

[0059] Among them, the refrigerant circulation circuit 11 enables the refrigerant to perform a refrigeration cycle in a circuit composed of a compressor, a condenser, an expansion valve, and an evaporator. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; the electronic expansion valve 12 is provided between the condenser and the evaporator. The electronic expansion valve 12 is configured to increase the flow resistance of the refrigerant passing through the electronic expansion valve 12 when its opening degree decreases, and decrease the flow resistance of the refrigerant passing through the electronic expansion valve 12 when its opening degree increases; the indoor fan 13 is configured to drive the indoor air to pass through the indoor heat exchanger by rotation, so that the refrigerant exchanges heat with the indoor air; the outdoor fan 14 is configured to drive the outdoor air to pass through the outdoor heat exchanger by rotation, so that the refrigerant exchanges heat with the outdoor air; the outdoor ambient temperature sensor 15 is configured to detect the outdoor ambient temperature; the indoor ambient temperature sensor 16 is configured to detect the indoor ambient temperature; the indoor coil temperature sensor 17 is configured to detect the indoor coil temperature; the discharge pressure sensor 18 is configured to detect the discharge pressure of the compressor.

[0060] The controller 71 is configured to: when the air conditioner 10 is turned on for cooling operation, obtain the current corresponding outdoor ambient temperature, and when the outdoor ambient temperature exceeds the first preset temperature threshold, control the air conditioner 10 to execute a cooling control strategy in a high-temperature environment.

[0061] Among them, when implementing the refrigeration control strategy in a high-temperature environment, the controller 71 is configured to: determine the simulated air outlet temperature of the air conditioner 10 according to the indoor coil temperature; determine the difference between the indoor ambient temperature and the simulated air outlet temperature; when the difference reaches or exceeds the first preset difference threshold, control the air conditioner 10 to maintain the current operating state; when the difference does not reach the first preset difference threshold, determine the first temperature correction coefficient according to the difference, and obtain the discharge pressure of the compressor; when the discharge pressure does not reach the preset pressure threshold, obtain the operating frequency of the compressor, and control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to make it decrease; when the discharge pressure reaches or exceeds the preset pressure threshold, obtain the rotation speed of the outdoor fan 14, and control the operating state of the outdoor fan 14 according to the rotation speed of the outdoor fan 14 and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to make it decrease.

[0062] In the embodiment, when the air conditioner 10 starts refrigeration operation, the current corresponding outdoor ambient temperature is obtained through the outdoor ambient temperature sensor 15. When the outdoor ambient temperature exceeds the first preset temperature threshold, for example, the outdoor ambient temperature is denoted as T2, and the first preset temperature threshold is denoted as t1 and t1 is 40 °C. Among them, the first preset temperature threshold t1 can be set according to different requirements, that is, when T2≥t1, the controller 71 will determine that the current environment is a high-temperature environment and control the air conditioner 10 to implement the refrigeration control strategy in a high-temperature environment.

[0063] Specifically, when the air conditioner 10 implements the refrigeration control strategy in a high-temperature environment, the controller 71 determines the simulated air outlet temperature of the air conditioner 10 according to the indoor coil temperature. Among them, the simulated air outlet temperature can reflect the cooling capacity that the air conditioner 10 can provide in the current operating state. Then, calculate the difference between the indoor ambient temperature and the simulated air outlet temperature. For example, the indoor ambient temperature is denoted as T4, and the simulated air outlet temperature is denoted as T1. Among them, the simulated air outlet temperature T1 can be understood as the air outlet temperature felt by the user during actual use. This temperature is generally selected as the temperature 2 meters away from the air outlet of the air conditioner 10, and can also be set according to the actual installation conditions.

[0064] The difference between the indoor environmental temperature T4 and the simulated air outlet temperature T1 is denoted as △T, i.e., △T = T4 - T1. The first preset difference threshold is denoted as t2 and t2 is 10°C. When the difference △T reaches or exceeds the first preset difference threshold t2, i.e., △T ≥ t2, the controller 71 controls the air conditioner 10 to maintain the current operating state. When the difference △T does not reach the first preset difference threshold t2, i.e., △T < t2, it can be understood that the current cooling effect cannot meet the demand. Therefore, the first temperature correction coefficient is further determined according to the difference △T. The first temperature correction coefficient is denoted as K2. At the same time, the controller 71 also acquires the exhaust pressure of the compressor. The exhaust pressure is denoted as P. Among them, the exhaust pressure P can be an important parameter for evaluating the working state of the compressor and the performance of the refrigeration system. If the exhaust pressure P does not reach the preset pressure threshold, the preset pressure threshold is denoted as Pmax, i.e., P < Pmax, it means that the compressor still has sufficient potential to improve the cooling effect. In this case, the controller 71 acquires the operating frequency of the compressor and controls the operating state of the compressor in combination with the first temperature correction coefficient K2 to increase the cooling capacity, thereby reducing the difference between the indoor environmental temperature T4 and the simulated air outlet temperature T1. If the exhaust pressure of the compressor reaches or exceeds the preset pressure threshold, i.e., P ≥ Pmax, it means that the compressor has approached its working limit and cannot improve the cooling effect by adjusting the compressor anymore. At this time, the controller 71 acquires the rotation speed of the outdoor fan 14 and controls the operating state of the outdoor fan 14 in combination with the first temperature correction coefficient K2 to improve the heat dissipation efficiency of the outdoor heat exchanger, thereby indirectly enhancing the cooling effect and further reducing the difference between the indoor environmental temperature T4 and the simulated air outlet temperature T1.

[0065] Through such a control strategy, the controller 71 can accurately adjust the operating state of the air conditioner 10 in a high-temperature environment, ensure that the cooling effect reaches the best, while maintaining the stable operation and energy efficiency optimization of the air conditioner 10, and improve the user's body feeling comfort.

[0066] In an embodiment of the present invention, when determining the first temperature correction coefficient according to the difference △T, the controller 71 is configured to: determine the corresponding first temperature correction coefficient K2 according to the temperature range where the difference △T is located. Among them, different temperature ranges correspond to different first temperature correction coefficients K2, and different temperature ranges and their corresponding first temperature correction coefficients K2 are stored in the air conditioner 10. The magnitude of the temperature difference is inversely proportional to the value of the first temperature correction coefficient K2.

[0067] Specifically, the controller 71 pre-sets multiple temperature ranges, and each temperature range has a corresponding first temperature correction coefficient K2. Different temperature ranges and their corresponding first temperature correction coefficients K2 are stored in the air conditioner 10 for quick call when needed. After the controller 71 calculates the difference ΔT, according to the temperature range where the difference ΔT is located, the corresponding first temperature correction coefficient K2 can be determined.

[0068] Since the magnitude of the temperature difference is inversely proportional to the value of the first temperature correction coefficient K2. In other words, the smaller the temperature difference, the larger the value of the first temperature correction coefficient K2; the larger the temperature difference, the smaller the value of the first temperature correction coefficient K2. Herein, the first temperature correction coefficient K2 is a non-zero positive integer.

[0069] For example, the temperature range where the difference ΔT is located is (t2, t3], and t3 is generally taken as 6°C, that is, t2 > ΔT ≥ t3. When t2 > ΔT ≥ t3, the first temperature correction coefficient K2 is determined to be 1, that is, K2 = 1; when ΔT < t3, the first temperature correction coefficient K2 is determined to be 2, that is, K2 = 2. Thus, by determining the corresponding first temperature correction coefficient K2 according to the temperature range where the difference ΔT is located, more accurate refrigeration control can be achieved in a high-temperature environment, providing a more comfortable air outlet temperature for users and improving the user's body feeling comfort.

[0070] In an embodiment of the present invention, when determining the simulated air outlet temperature of the air conditioner 10 according to the indoor coil temperature, the controller 71 is configured to perform the following operation:

[0071] T1 = K1 * T3 + B;

[0072] Wherein, T1 is the simulated air outlet temperature, K1 is a preset second temperature correction coefficient, T3 is the indoor coil temperature, and B is a preset intercept, which is a preset known quantity.

[0073] In the embodiment, when determining the simulated air outlet temperature of the air conditioner 10 according to the indoor coil temperature, the calculation can be performed according to the relational expression between the indoor coil temperature and the simulated air outlet temperature, that is, T1 = K1 * T3 + B. Wherein, T1 is the simulated air outlet temperature, K1 is a preset second temperature correction coefficient, which is used to adjust the influence of the indoor coil temperature T3 on the simulated air outlet temperature T1; T3 is the indoor coil temperature, and the indoor coil temperature T3 is obtained by the indoor coil temperature sensor 17 and used as a known input value; B is a preset intercept, and the preset intercept B is also a known quantity.

[0074] Specifically, at different wind speeds, the air volume (i.e., wind speed) is different, and the feeling on the body surface is also different. The corresponding second temperature correction coefficient K1 and preset intercept B can be set respectively for each wind speed. This usually requires measuring the actual outlet air temperature at different wind speeds and comparing it with the indoor coil temperature T3 to obtain the optimal second temperature correction coefficient K1 and preset intercept B. This method of refining the second temperature correction coefficient K1 and preset intercept B makes the calculated simulated outlet air temperature T1 more accurate, thereby achieving precise refrigeration control.

[0075] In an embodiment of the present invention, when controlling the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient K2, the controller 71 is configured to: when the operating frequency of the compressor does not reach the preset frequency upper limit threshold, increase the operating frequency of the compressor according to the first temperature correction coefficient K2, and control the compressor to operate at the increased operating frequency until after operating for the first preset time, return to the step of determining the difference between the indoor environmental temperature T4 and the simulated outlet air temperature T1; when the operating frequency of the compressor reaches or exceeds the preset frequency upper limit threshold, obtain the rotation speed of the outdoor fan 14, and control the operating state of the outdoor fan 14 according to the rotation speed of the outdoor fan 14 and the first temperature correction coefficient K2.

[0076] Specifically, when the operating frequency of the compressor does not reach the preset frequency upper limit threshold, for example, the operating frequency of the compressor is denoted as F, and the preset frequency upper limit threshold is denoted as Fmax. The controller 71 increases the operating frequency F of the compressor according to the first temperature correction coefficient K2. The increased operating frequency can enable the compressor to generate greater refrigeration capacity and accelerate the cooling process.

[0077] After the compressor operates at the increased operating frequency F for the first preset time, the controller 71 will return to the step of determining the difference between the indoor environmental temperature T4 and the simulated outlet air temperature T1 to re-detect the current refrigeration efficiency and demand, so as to adjust the operating state of the compressor according to the new difference.

[0078] On the other hand, when the operating frequency F of the compressor reaches or exceeds the preset frequency upper limit threshold Fmax, that is, F≥Fmax, it indicates that the compressor is already in a high-load operating state. In this case, if the operating frequency F of the compressor is continuously increased, it may cause damage to the air conditioner 10. Therefore, the controller 71 instead obtains the rotation speed of the outdoor fan 14 and controls the operating state of the outdoor fan 14 according to the rotation speed of the outdoor fan 14 and the first temperature correction coefficient K2.

[0079] Among them, the operating frequency F of the compressor is not limited by the upper limit frequency corresponding to the indoor air volume and temperature range, but is restricted and controlled by protective frequency reduction due to exhaust gas temperature, current, module temperature, etc. In these protective frequency reduction measures, if there are conflicts, they will be executed according to the priority to ensure that the compressor can be protected from damage in a timely and effective manner under abnormal conditions.

[0080] In an embodiment of the present invention, when the operating frequency F of the compressor is increased according to the first temperature correction coefficient K2, the controller 71 is configured to: when the increased operating frequency exceeds the preset frequency upper limit threshold Fmax, limit the increased operating frequency to the preset frequency upper limit threshold.

[0081] In the embodiment, when the operating frequency F of the compressor is increased according to the first temperature correction coefficient K2, if the increased operating frequency exceeds the preset frequency upper limit threshold Fmax, the controller 71 limits the increased operating frequency to the preset frequency upper limit threshold Fmax, rather than operating at the calculated excessive frequency. By limiting the operating frequency F of the compressor, it can be ensured that the compressor will not be damaged due to overload, while ensuring the stability of the system and preventing the system from becoming unstable due to the excessive operating frequency F of the compressor, thereby extending the service life of the air conditioner 10.

[0082] For example, the current operating frequency F of the compressor is 40 Hz, and the first temperature correction coefficient K2 is 1. The operating frequency of the compressor is increased according to the first temperature correction coefficient K2, that is, 2K2 is added to the current operating frequency F of the compressor, and the increased operating frequency is denoted as F1. Then, the increased operating frequency is F1 = F + 2K2. Substituting the known values, F1 = 40 + 2*1 = 42. If the increased operating frequency F1 exceeds the preset frequency upper limit threshold Fmax, that is, F1 > Fmax, then the increased operating frequency F1 is limited to the preset frequency upper limit threshold Fmax.

[0083] In an embodiment of the present invention, when controlling the compressor to operate at the increased operating frequency F1, the controller 71 is further configured to: determine the superheat degree of the exhaust gas corresponding to the increased operating frequency F1, and control the opening degree of the electronic expansion valve 12 according to the superheat degree of the exhaust gas.

[0084] In the embodiment, after the controller 71 determines the increased operating frequency F1, it obtains the superheat degree of the exhaust gas corresponding to this frequency, and the opening degree of the electronic expansion valve 12 is adjusted according to the superheat degree of the exhaust gas. Among them, the opening degree of the electronic expansion valve 12 directly affects the refrigerating capacity, and further affects the refrigerating effect of the evaporator and the compressor. Therefore, controlling the opening degree of the electronic expansion valve 12 according to the superheat degree of the exhaust gas can ensure that the compressor maintains the best operating state and realizes the stable operation of the compressor.

[0085] Specifically, the increased operating frequency F1 has a corresponding exhaust superheat degree, for example, denoted as the target superheat degree, to ensure that the compressor operates in the best state. Then, the actual superheat degree is detected and compared with the target superheat degree. According to the comparison result, the opening degree of the electronic expansion valve 12 is controlled, so that the actual superheat degree reaches the target superheat degree, thereby realizing the stable operation of the compressor and helping to improve the refrigeration performance of the air conditioner 10.

[0086] In an embodiment of the present invention, when controlling the operating state of the outdoor fan 14 according to the rotation speed of the outdoor fan 14 and the first temperature correction coefficient K2, the controller 71 is configured to: when the rotation speed of the outdoor fan 14 does not reach the preset rotation speed upper limit threshold, the rotation speed of the outdoor fan 14 is increased according to the first temperature correction coefficient K2, and the outdoor fan 14 is controlled to operate at the increased rotation speed until after operating for a second preset time, return to the step of determining the difference between the indoor ambient temperature T4 and the simulated air outlet temperature T1; when the rotation speed of the outdoor fan 14 reaches or exceeds the preset rotation speed upper limit threshold, obtain the rotation speed of the indoor fan 13, and control the operating state of the indoor fan 13 according to the rotation speed of the indoor fan 13 and the first temperature correction coefficient K2.

[0087] In the embodiment, when the rotation speed of the outdoor fan 14 does not reach the preset rotation speed upper limit threshold, for example, the rotation speed of the outdoor fan 14 is denoted as N 外 , and the preset rotation speed upper limit threshold is denoted as N 外max , that is, N 外 < N 外max At this time, the controller 71 increases the rotation speed of the outdoor fan 14 according to the first temperature correction coefficient K2, so as to improve the heat dissipation capacity of the air conditioner 10 by increasing the rotation speed of the outdoor fan 14.

[0088] After the controller 71 controls the outdoor fan 14 to operate at the increased rotation speed for a second preset time, it returns to the step of determining the difference between the indoor ambient temperature T4 and the simulated air outlet temperature T1, so as to adjust the control strategy according to the new environmental conditions. Through this cyclic process, the outdoor fan 14 can maintain the best operating state.

[0089] If the rotation speed of the outdoor fan 14 reaches or exceeds the preset rotation speed upper limit threshold, that is, N 外 ≥ N 外max At this time, increasing the rotation speed of the outdoor fan 14 can no longer meet the heat dissipation requirement of the air conditioner 10. In this case, the controller 71 will obtain the rotation speed of the indoor fan 13 and control the operating state of the indoor fan 13 according to the rotation speed of the indoor fan 13 and the first temperature correction coefficient K2.

[0090] In one embodiment of the present invention, when controlling the outdoor fan 14 to operate at the increased speed, the controller 71 is configured to: when the increased speed exceeds the preset speed upper limit threshold, limit the increased speed to the preset speed upper limit threshold.

[0091] Specifically, when controlling the outdoor fan 14 to operate at the increased speed, if the increased speed exceeds the preset speed upper limit threshold, the increased speed is denoted as N1 for example, that is, N1 > N 外max at this time, the controller 71 will immediately take measures to limit the increased speed N1 to the preset speed upper limit threshold N 外max .

[0092] For example, the current speed of the outdoor fan 14 is 800 rpm, and the first temperature correction coefficient K2 is 1. The speed of the outdoor fan 14 is increased according to the first temperature correction coefficient K2, that is, on the basis of the current speed N 外 of the outdoor fan 14, add 10K2, then the calculated increased speed N1 = 800 + 10 * 1 = 810.

[0093] If the increased speed N1 exceeds the preset speed upper limit threshold N 外max , that is, N 外max < 810, then the outdoor fan 14 will operate according to the preset speed upper limit threshold N 外max to ensure that while the air conditioner 10 meets the operation requirements, the risk caused by too high speed of the indoor fan 14 is avoided, such as damage to the outdoor fan 14 or system overload, thus ensuring the stability and safety of the air conditioner 10.

[0094] In one embodiment of the present invention, when controlling the operating state of the indoor fan 13 according to the speed of the indoor fan 13 and the first temperature correction coefficient K2, the controller 71 is configured to: when the speed of the indoor fan 13 exceeds the preset speed lower limit threshold, reduce the speed of the indoor fan 13 according to the first temperature correction coefficient K2, and control the indoor fan 13 to operate at the reduced speed until after running for the third preset time, return to the step of determining the difference between the indoor environmental temperature T4 and the simulated air outlet temperature T1; when the speed of the indoor fan 13 does not exceed the preset speed lower limit threshold, control the air conditioner 10 to maintain the current operating state.

[0095] In the embodiment, when the speed of the indoor fan 13 exceeds the preset speed lower limit threshold, for example, the speed of the indoor fan 13 is denoted as N 内 , the preset speed lower limit threshold is denoted as N 内min , that is, N 内 > N 内min at this time, the controller 71 will start a speed reduction process, and reduce the speed N of the indoor fan 13 according to the first temperature correction coefficient K2内 is reduced.

[0096] After the controller 71 controls the indoor fan 13 to operate at the reduced rotational speed for a third preset time, it returns to the step of determining the difference between the indoor ambient temperature T4 and the simulated air outlet temperature T1, so as to re-evaluate the difference between the indoor ambient temperature T4 and the simulated air outlet temperature T1, facilitating adjusting the operating state of the indoor fan 13 according to the new difference, ensuring that the air conditioner 10 operates in an optimal state, and thus providing a more comfortable indoor environment.

[0097] On the other hand, if the rotational speed N of the indoor fan 13 内 does not exceed the preset rotational speed lower limit threshold, that is, N 内 ≤N 内min at this time, the rotational speed N of the indoor fan 13 at this time 内 is appropriate and does not need to be adjusted. Therefore, the air conditioner 10 maintains the current operating state.

[0098] In an embodiment of the present invention, when controlling the indoor fan 13 to operate at the reduced rotational speed, the controller 71 is configured to: when the reduced rotational speed exceeds the preset rotational speed lower limit threshold, raise the reduced rotational speed to the preset rotational speed lower limit threshold.

[0099] In the embodiment, when the controller 71 controls the indoor fan 13 to operate at the reduced rotational speed, during the operation, the controller 71 will also check whether the reduced rotational speed exceeds the preset rotational speed lower limit threshold N 内min , for example, record the reduced rotational speed as N2. If the reduced rotational speed exceeds the preset rotational speed lower limit threshold N 内min , that is, N2≤N 内min , then the controller 71 raises the reduced rotational speed to the preset rotational speed lower limit threshold N 内min , and operates according to the preset rotational speed lower limit threshold N 内min , which can prevent the rotational speed N of the indoor fan 13 内 from being too low, resulting in a decline in the performance of the air conditioner 10, improving the safety of the air conditioner 10. In addition, restricting the rotational speed lower limit helps to maintain the comfort of the indoor environment, thereby enhancing the user experience.

[0100] For example, the current rotational speed N of the indoor fan 13 内 is 1000 rpm, and the first temperature correction coefficient K2 is 2. The rotational speed of the indoor fan 13 is reduced according to the first temperature correction coefficient K2, that is, subtract 10K2 from the current rotational speed N of the indoor fan 13 内 . Then the calculated reduced rotational speed N2 = N 内 -10K2. Substituting the known values, the calculated reduced rotational speed N2 = 980 rpm.

[0101] If the obtained reduced rotational speed N2 exceeds the preset rotational speed lower limit threshold, i.e., 980 ≤ N 内min , then the rotational speed N of the indoor fan 13 内 will operate according to the preset rotational speed lower limit threshold N 内min to avoid the situation that the reduced rotational speed N2 of the indoor fan 13 is excessively reduced, which affects the comfort of the indoor environment. By raising the reduced rotational speed N2 of the indoor fan 13 to the preset rotational speed lower limit threshold N 内min , it can ensure that the indoor fan 13 provides a relatively comfortable indoor environment for users, enables the air conditioner 10 to operate in an optimal state, and improves the user experience.

[0102] For the air conditioner 10 according to an embodiment of the present invention, when the air conditioner starts the cooling operation, by comparing the current corresponding outdoor ambient temperature with the first preset temperature threshold, when the outdoor ambient temperature exceeds the first preset temperature threshold, the air conditioner is controlled to execute the cooling control strategy in a high-temperature environment, that is, the simulated air outlet temperature and the indoor ambient temperature of the air conditioner are obtained, and the difference between the indoor ambient temperature and the simulated air outlet temperature is determined. According to the difference, the first temperature correction coefficient is determined. When the exhaust pressure does not reach the preset pressure threshold, the operating state of the compressor is controlled according to the operating frequency of the compressor and the first temperature correction coefficient. When the exhaust pressure reaches or exceeds the preset pressure threshold, the operating state of the outdoor fan is controlled according to the rotational speed of the outdoor fan and the first temperature correction coefficient. By adjusting the operating states of the compressor and the outdoor fan, the difference between the indoor ambient temperature and the simulated air outlet temperature is reduced, so as to achieve the purpose of improving the air outlet temperature of the air conditioner, thereby meeting the actual needs of users and improving the user's body sensation comfort.

[0103] A further embodiment of the present invention also discloses a control method for an air conditioner, which is used for the air conditioner in any of the above embodiments, as Figure 4 shown. This method includes the following steps:

[0104] When the air conditioner starts the cooling operation, obtain the current corresponding outdoor ambient temperature. When the outdoor ambient temperature exceeds the first preset temperature threshold, control the air conditioner to execute the cooling control strategy in a high-temperature environment.

[0105] Among them, when executing the cooling control strategy in a high-temperature environment, it specifically includes steps S1 - step S6.

[0106] Step S1, determine the simulated air outlet temperature of the air conditioner according to the indoor coil temperature.

[0107] Step S2, determine the difference between the indoor ambient temperature and the simulated air outlet temperature.

[0108] Step S3, when the difference reaches or exceeds the first preset difference threshold, control the air conditioner to maintain the current operating state.

[0109] Step S4, when the difference does not reach the first preset difference threshold, determine the first temperature correction coefficient according to the difference, and obtain the exhaust pressure of the compressor.

[0110] Step S5, when the exhaust pressure does not reach the preset pressure threshold, obtain the operating frequency of the compressor, and control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient, so as to adjust the difference between the indoor environment temperature and the simulated air outlet temperature.

[0111] Step S6, when the exhaust pressure reaches or exceeds the preset pressure threshold, obtain the rotational speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient, so as to adjust the difference between the indoor environment temperature and the simulated air outlet temperature.

[0112] In a specific embodiment, reference can be made to Figure 5 the overall flowchart of the control method of the air conditioner shown, and this process at least includes Step S11 - Step S25.

[0113] Step S11, the air conditioner starts refrigeration operation.

[0114] Step S12, obtain the current corresponding outdoor ambient temperature.

[0115] Step S13, determine whether the outdoor environment exceeds the first preset temperature threshold. If so, execute Step S14; if not, execute Step S15.

[0116] Step S14, control the air conditioner to execute the refrigeration control strategy in a high-temperature environment.

[0117] Step S15, operate in the normal mode, that is, do not execute the refrigeration control strategy in a high-temperature environment.

[0118] Step S16, determine whether the difference between the indoor environment temperature and the simulated air outlet temperature reaches or exceeds the first preset difference threshold. If so, execute S17; if not, execute Step S18.

[0119] Step S17, control the air conditioner to maintain the current operating state.

[0120] Step S18, determine the corresponding first temperature correction coefficient according to the temperature range where the difference is located, and obtain the exhaust pressure of the compressor.

[0121] Step S19, determine whether the difference is within the temperature range. If so, execute Step S20; if not, execute Step S21.

[0122] Step S20, the value of the first temperature correction coefficient is on the small side.

[0123] Step S21, the value of the first temperature correction coefficient is on the high side.

[0124] Step S22, determine whether the exhaust pressure reaches a preset pressure threshold. If so, execute S23; if not, execute step S24.

[0125] Step S23, obtain the rotation speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotation speed of the outdoor fan and the first temperature correction coefficient.

[0126] Step S24, obtain the operating frequency of the compressor, and control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient.

[0127] Step S25, adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to make it decrease.

[0128] In an embodiment of the present invention, when determining the first temperature correction coefficient according to the difference, it includes: determining the corresponding first temperature correction coefficient according to the temperature range where the difference is located, where different temperature ranges correspond to different first temperature correction coefficients, and different temperature ranges and their corresponding first temperature correction coefficients are stored in the air conditioner, and the magnitude of the temperature difference is inversely proportional to the value of the first temperature correction coefficient.

[0129] In an embodiment of the present invention, when determining the simulated air outlet temperature of the air conditioner according to the indoor coil temperature, the following operation is performed:

[0130] T1 = K1 * T3 + B;

[0131] where T1 is the simulated air outlet temperature, K1 is a preset second temperature correction coefficient, T3 is the indoor coil temperature, and B is a preset intercept.

[0132] In an embodiment of the present invention, when controlling the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient, it includes: when the operating frequency of the compressor does not reach the preset frequency upper limit threshold, increase the operating frequency of the compressor according to the first temperature correction coefficient, and control the compressor to operate at the increased operating frequency until after running for the first preset time, return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature; when the operating frequency of the compressor reaches or exceeds the preset frequency upper limit threshold, obtain the rotation speed of the outdoor fan, and control the operating state of the outdoor fan according to the rotation speed of the outdoor fan and the first temperature correction coefficient.

[0133] In an embodiment of the present invention, when increasing the operating frequency of the compressor according to the first temperature correction coefficient, it includes: when the increased operating frequency exceeds the preset frequency upper limit threshold, limit the increased operating frequency to the preset frequency upper limit threshold.

[0134] In one embodiment of the present invention, when controlling the compressor to operate at the increased operating frequency, it includes: determining the superheat degree of exhaust corresponding to the increased operating frequency, and controlling the opening degree of the electronic expansion valve according to the superheat degree of exhaust.

[0135] In a specific embodiment, referring to Figure 6 the flowchart of controlling the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient shown in the figure, this process includes steps S31 - step S40.

[0136] Step S31, determine whether the operating frequency of the compressor reaches or exceeds the preset frequency upper limit threshold. If so, execute step S32; if not, execute step S39.

[0137] Step S32, increase the operating frequency of the compressor according to the first temperature correction coefficient.

[0138] Step S33, the increased operating frequency exceeds the preset frequency upper limit threshold.

[0139] Step S34, limit the increased operating frequency to the preset frequency upper limit threshold.

[0140] Step S35, control the compressor to operate at the increased operating frequency.

[0141] Step S36, determine the superheat degree of exhaust corresponding to the increased operating frequency, and control the opening degree of the electronic expansion valve according to the superheat degree of exhaust.

[0142] Step S37, operate for the first preset time.

[0143] Step S38, return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature.

[0144] Step S39, obtain the rotational speed of the outdoor fan.

[0145] Step S40, control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient.

[0146] In one embodiment of the present invention, when controlling the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient, it includes: when the rotational speed of the outdoor fan does not reach the preset rotational speed upper limit threshold, increase the rotational speed of the outdoor fan according to the first temperature correction coefficient, and control the outdoor fan to operate at the increased rotational speed until after operating for the second preset time, then return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature; when the rotational speed of the outdoor fan reaches or exceeds the preset rotational speed upper limit threshold, obtain the rotational speed of the indoor fan, and control the operating state of the indoor fan according to the rotational speed of the indoor fan and the first temperature correction coefficient.

[0147] In one embodiment of the present invention, when controlling the outdoor fan to operate at the increased speed, it includes: when the increased speed exceeds the preset speed upper limit threshold, the increased speed is limited to the preset speed upper limit threshold.

[0148] In a specific embodiment, referring to Figure 7 the flowchart shown for controlling the operating state of the outdoor fan according to the speed of the outdoor fan and the first temperature correction coefficient, this process includes steps S51 - step S59.

[0149] Step S51, determine whether the speed of the outdoor fan reaches or exceeds the preset speed upper limit threshold. If so, execute step S52; if not, execute step S58.

[0150] Step S52, increase the speed of the outdoor fan according to the first temperature correction coefficient.

[0151] Step S53, the increased speed exceeds the preset speed upper limit threshold.

[0152] Step S54, limit the increased speed to the preset speed upper limit threshold.

[0153] Step S55, control the outdoor fan to operate at the increased speed.

[0154] Step S56, operate for a second preset time.

[0155] Step S57, return to the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature.

[0156] Step S58, obtain the speed of the indoor fan.

[0157] Step S59, control the operating state of the indoor fan according to the speed of the indoor fan and the first temperature correction coefficient.

[0158] In one embodiment of the present invention, when controlling the indoor fan to operate at the reduced speed, it includes: when the reduced speed exceeds the preset speed lower limit threshold, increase the reduced speed to the preset speed lower limit threshold; when the speed of the indoor fan does not exceed the preset speed lower limit threshold, control the air conditioner to maintain the current operating state.

[0159] In one embodiment of the present invention, when controlling the indoor fan to operate at the reduced speed, it includes: when the reduced speed exceeds the preset speed lower limit threshold, increase the reduced speed to the preset speed lower limit threshold.

[0160] In a specific embodiment, referring to Figure 8 the flowchart shown for controlling the operating state of the indoor fan according to the rotational speed of the indoor fan and the first temperature correction coefficient, this process includes steps S61 - step S68.

[0161] Step S61, determine whether the rotational speed of the indoor fan reaches or exceeds the preset rotational speed lower limit threshold. If so, execute step S62; if not, execute step S68.

[0162] Step S62, reduce the rotational speed of the outdoor fan according to the first temperature correction coefficient.

[0163] Step S63, the reduced rotational speed exceeds the preset rotational speed lower limit threshold.

[0164] Step S64, increase the reduced rotational speed to the preset rotational speed lower limit threshold.

[0165] Step S65, control the indoor fan to operate at the reduced rotational speed.

[0166] Step S66, operate for a third preset time.

[0167] Step S67, return to the step of determining the difference between the indoor environment temperature and the simulated air outlet temperature.

[0168] Step S68, control the air conditioner to maintain the current operating state.

[0169] According to the control method of the air conditioner in the embodiment of the present invention, when the air conditioner is turned on for cooling operation, by comparing the current corresponding outdoor environment temperature with the first preset temperature threshold, when the outdoor environment temperature exceeds the first preset temperature threshold, control the air conditioner to execute the cooling control strategy in a high-temperature environment, that is, obtain the simulated air outlet temperature and the indoor environment temperature of the air conditioner, and determine the difference between the indoor environment temperature and the simulated air outlet temperature. Determine the first temperature correction coefficient according to the difference. When the exhaust pressure does not reach the preset pressure threshold, control the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient. When the exhaust pressure reaches or exceeds the preset pressure threshold, control the operating state of the outdoor fan according to the rotational speed of the outdoor fan and the first temperature correction coefficient. By adjusting the operating states of the compressor and the outdoor fan, reduce the difference between the indoor environment temperature and the simulated air outlet temperature, achieve the purpose of improving the air outlet temperature of the air conditioner, thereby meeting the actual needs of users and improving the user's body feeling comfort.

[0170] It should be noted that when the control method of the air conditioner according to the embodiment of the present invention controls the air conditioner, its specific implementation manner is similar to that of the air conditioner according to the embodiment of the present invention. For details, please refer to the description of the air conditioner part. To reduce redundancy, it will not be elaborated here.

[0171] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0172] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that: include: A refrigerant circulation loop, wherein the refrigerant performs a refrigeration cycle in a loop consisting of a compressor, a condenser, an expansion valve, and an evaporator, wherein one of the condenser and the evaporator is an outdoor heat exchanger and the other is an indoor heat exchanger; an electronic expansion valve, disposed between the condenser and the evaporator, the electronic expansion valve being used to increase the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is reduced, and to reduce the flow resistance of the refrigerant passing through the electronic expansion valve when the opening degree of the electronic expansion valve is increased; An indoor fan, used to drive the indoor air to pass through the indoor heat exchanger by rotating, so that the refrigerant and the indoor air can exchange heat; An outdoor fan is used to drive outdoor air to pass through the outdoor heat exchanger by rotating so that the refrigerant and the outdoor air can exchange heat; Outdoor ambient temperature sensor, used to detect outdoor ambient temperature; Indoor ambient temperature sensor, used to detect indoor ambient temperature; Indoor coil temperature sensor, used to detect indoor coil temperature; An exhaust pressure sensor, used to detect the exhaust pressure of the compressor; A controller, wherein the controller is configured to: when the air conditioner is turned on for cooling operation, obtain the current corresponding outdoor environment temperature, and when the outdoor environment temperature exceeds a first preset temperature threshold, control the air conditioner to execute a cooling control strategy under a high temperature environment; Wherein, when executing the refrigeration control strategy in the high temperature environment, the controller is configured as follows: Determining a simulated air outlet temperature of the air conditioner according to the indoor coil temperature; Determining a difference between the indoor ambient temperature and the simulated air outlet temperature; When the difference reaches or exceeds a first preset difference threshold, controlling the air conditioner to maintain a current operating state; When the difference does not reach the first preset difference threshold, determining a first temperature correction coefficient according to the difference, and obtaining the exhaust pressure of the compressor; When the exhaust pressure does not reach the preset pressure threshold, the operating frequency of the compressor is obtained, and the operating state of the compressor is controlled according to the operating frequency of the compressor and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to reduce it; When the exhaust pressure reaches or exceeds the preset pressure threshold, the speed of the outdoor fan is obtained, and the operating state of the outdoor fan is controlled according to the speed of the outdoor fan and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature to reduce it.

2. The air conditioner according to claim 1, characterized in that: When determining the first temperature correction coefficient according to the difference, the controller is configured to: The corresponding first temperature correction coefficient is determined according to the temperature range in which the difference is located, wherein different temperature ranges correspond to different first temperature correction coefficients, and different temperature ranges and their corresponding first temperature correction coefficients are stored in the air conditioner, and the size of the temperature difference is inversely proportional to the value of the first temperature correction coefficient.

3. The air conditioner according to claim 1, characterized in that: When determining the simulated air outlet temperature of the air conditioner according to the indoor coil temperature, the controller is configured to perform the following operations: T1=K1*T3+B; Wherein, T1 is the simulated air outlet temperature, K1 is the preset second temperature correction coefficient, T3 is the indoor coil temperature, and B is the preset intercept.

4. The air conditioner according to claim 1, characterized in that: When controlling the operating state of the compressor according to the operating frequency of the compressor and the first temperature correction coefficient, the controller is configured as follows: When the operating frequency of the compressor does not reach the preset frequency upper limit threshold, the operating frequency of the compressor is increased according to the first temperature correction coefficient, and the compressor is controlled to operate at the increased operating frequency until it runs for a first preset time, and then the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature is returned; When the operating frequency of the compressor reaches or exceeds a preset frequency upper limit threshold, the rotation speed of the outdoor fan is obtained, and the operating state of the outdoor fan is controlled according to the rotation speed of the outdoor fan and the first temperature correction coefficient.

5. The air conditioner according to claim 4, characterized in that: When the operating frequency of the compressor is increased according to the first temperature correction coefficient, the controller is configured as follows: When the increased operating frequency exceeds the preset frequency upper limit threshold, the increased operating frequency is limited to the preset frequency upper limit threshold.

6. The air conditioner according to claim 4, characterized in that: When controlling the compressor to operate at the increased operating frequency, the controller is further configured to: The exhaust gas superheat corresponding to the increased operating frequency is determined, and the opening of the electronic expansion valve is controlled according to the exhaust gas superheat.

7. The air conditioner according to claim 4, characterized in that: When controlling the operating state of the outdoor fan according to the rotation speed of the outdoor fan and the first temperature correction coefficient, the controller is configured as follows: When the speed of the outdoor fan does not reach the preset speed upper limit threshold, the speed of the outdoor fan is increased according to the first temperature correction coefficient, and the outdoor fan is controlled to run at the increased speed until it runs for a second preset time, and then the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature is returned; When the rotation speed of the outdoor fan reaches or exceeds the preset upper speed threshold, the rotation speed of the indoor fan is acquired, and the operation state of the indoor fan is controlled according to the rotation speed of the indoor fan and the first temperature correction coefficient.

8. The air conditioner according to claim 7, characterized in that: When controlling the outdoor fan to run at the increased speed, the controller is configured as follows: When the increased speed exceeds the preset speed upper limit threshold, the increased speed is limited to the preset speed upper limit threshold.

9. The air conditioner according to claim 7, characterized in that: When controlling the operating state of the indoor fan according to the rotation speed of the indoor fan and the first temperature correction coefficient, the controller is configured as follows: When the speed of the indoor fan exceeds a preset speed lower limit threshold, the speed of the indoor fan is reduced according to the first temperature correction coefficient, and the indoor fan is controlled to operate at the reduced speed until it runs for a third preset time, and then the step of determining the difference between the indoor ambient temperature and the simulated air outlet temperature is returned; When the rotation speed of the indoor fan does not exceed the preset rotation speed lower limit threshold, the air conditioner is controlled to maintain the current operating state.

10. The air conditioner according to claim 9, characterized in that: When controlling the indoor fan to operate at a reduced speed, the controller is configured to: When the reduced speed exceeds the preset speed lower limit threshold, the reduced speed is increased to the preset speed lower limit threshold.

11. A method for controlling an air conditioner, characterized in that: For the air conditioner according to any one of claims 1 to 10, the method comprises the following steps: When the air conditioner is turned on for cooling operation, obtaining the current corresponding outdoor environment temperature, and when the outdoor environment temperature exceeds a first preset temperature threshold, controlling the air conditioner to execute a cooling control strategy under a high temperature environment; Wherein, when executing the refrigeration control strategy in the high temperature environment, it includes: Determining a simulated air outlet temperature of the air conditioner according to the indoor coil temperature; Determining a difference between the indoor ambient temperature and the simulated air outlet temperature; When the difference reaches or exceeds a first preset difference threshold, controlling the air conditioner to maintain a current operating state; When the difference does not reach the first preset difference threshold, determining a first temperature correction coefficient according to the difference, and obtaining the exhaust pressure of the compressor; When the exhaust pressure does not reach the preset pressure threshold, the operating frequency of the compressor is obtained, and the operating state of the compressor is controlled according to the operating frequency of the compressor and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature; When the exhaust pressure reaches or exceeds the preset pressure threshold, the speed of the outdoor fan is obtained, and the operating state of the outdoor fan is controlled according to the speed of the outdoor fan and the first temperature correction coefficient to adjust the difference between the indoor ambient temperature and the simulated air outlet temperature.

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