Air conditioner and temperature zone control method for air conditioner

Abstract

The present invention discloses an air conditioner and a temperature zone control method for the air conditioner. Upon receiving a preset temperature zone control instruction, the outdoor temperature of the outdoor environment is obtained; when the outdoor temperature is within a preset outdoor normal temperature range, the outdoor fan is controlled to start at a preset high speed; the opening of the expansion valve is set to a preset first opening value, and the temperature difference between the current coil temperature of the outdoor coil and the re-acquired current outdoor temperature of the outdoor environment is calculated; when the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude; when the calculated temperature difference is less than the first threshold and not less than the preset second threshold, the outdoor fan and the expansion valve are maintained in operation with current parameters. This application can maximize the overall performance of the air conditioner, avoid energy waste, reduce shutdown protection, and maintain normal operation of the entire machine.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air conditioner and a temperature zone control method for the air conditioner. Background Art

[0002] When a fixed-speed air conditioner is operating normally for cooling, its outdoor fan speed and throttling effect are fixed and cannot be adjusted according to the outdoor ambient temperature or the outdoor heat exchange efficiency. If a fixed-speed air conditioner starts cooling when the outdoor ambient temperature is high, if the outdoor fan starts too slowly, the system will not be able to quickly exchange heat, causing the pressure of the entire unit to rise rapidly and the entire unit to trigger system protection. If a fixed-speed air conditioner starts cooling when the outdoor ambient temperature is low, if it runs at a higher speed, the outdoor heat exchanger will not be able to exchange heat effectively, resulting in relatively low system pressure and the inability to fully utilize the system's capacity. Moreover, due to the excessively high outdoor fan speed, the power consumption will also increase significantly, which is not conducive to energy conservation.

[0003] Existing control methods for fixed-speed air conditioners fail to stabilize the air conditioner within the appropriate condenser temperature range to maximize overall performance, resulting in significant energy waste. Furthermore, in extreme ambient temperatures, various protections may trigger, causing the entire unit to malfunction. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide an air conditioner and a temperature zone control method for the air conditioner, which can maximize the overall performance of the air conditioner, avoid energy waste, reduce shutdown protection, and maintain normal operation of the entire machine.

[0005] To achieve the above object, an embodiment of the present invention provides an air conditioner, comprising:

[0006] a refrigerant circuit in which refrigerant circulates sequentially through 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;

[0007] An outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger;

[0008] Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil;

[0009] An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment;

[0010] The controller is configured as:

[0011] Upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment;

[0012] When the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed;

[0013] Setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment;

[0014] When the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude;

[0015] When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, maintaining the outdoor fan and the expansion valve to operate with current parameters;

[0016] The first threshold is greater than the second threshold.

[0017] Preferably, the controller is further configured to:

[0018] When the calculated temperature difference is less than the second threshold and greater than a preset third threshold, the outdoor fan is kept running with current parameters, the opening of the expansion valve is reduced by a preset third amplitude, and the temperature difference is recalculated;

[0019] The second threshold is greater than the third threshold.

[0020] Furthermore, the controller is further configured to:

[0021] When the calculated temperature difference is not greater than the third threshold, calculating a duration during which the temperature difference is not greater than the third threshold;

[0022] When the calculated duration is not less than the preset first duration, the rotation speed of the outdoor fan is reduced by a preset fourth amplitude, the opening of the expansion valve is reduced by a preset fifth amplitude, and the temperature difference is recalculated.

[0023] As a preferred solution, the controller is further configured to:

[0024] When the outdoor temperature is within a preset outdoor high temperature range, the outdoor fan is controlled to start at a preset high speed, and after the outdoor fan is running, the speed of the outdoor fan is increased to a maximum speed;

[0025] Setting the opening of the expansion valve to a preset second opening value, and obtaining the coil temperature of the outdoor coil;

[0026] When the coil temperature is in a preset coil high temperature range, increasing the opening of the expansion valve by the second amplitude;

[0027] The outdoor high temperature range has no intersection with the outdoor normal temperature range, and the second opening value is higher than the first opening value.

[0028] Furthermore, the controller is further configured to:

[0029] When the current coil temperature is not in the coil high temperature range, the outdoor fan and the expansion valve are kept operating with current parameters.

[0030] Preferably, the controller is further configured to:

[0031] After the outdoor fan is started, re-obtaining the current outdoor temperature of the outdoor environment;

[0032] When the re-acquired current outdoor ambient temperature is still within the outdoor high temperature range, the rotational speed of the outdoor fan is increased to a maximum rotational speed.

[0033] Preferably:

[0034] When the outdoor temperature is within a preset low outdoor temperature range, the outdoor fan is controlled to start at a preset medium speed;

[0035] Setting the opening of the expansion valve to a preset third opening value, and calculating a temperature difference between a current coil temperature of the outdoor coil and a current outdoor temperature of the outdoor environment;

[0036] When the calculated temperature difference is not less than a preset fourth threshold, increasing the opening of the expansion valve by a preset sixth amplitude and recalculating the temperature difference;

[0037] When the calculated temperature difference is less than the fourth threshold value and not less than a preset fifth threshold value, the outdoor fan and the expansion valve are kept running with current parameters and the temperature difference is recalculated;

[0038] The third opening value is lower than the first opening value, and the fourth threshold is greater than the fifth threshold.

[0039] As an improvement to the above solution, the controller is further configured to:

[0040] When the calculated temperature difference is less than the fifth threshold value and greater than a preset sixth threshold value, the speed of the outdoor fan is reduced by a preset seventh amplitude, the opening of the expansion valve is reduced by a preset eighth amplitude, and the temperature difference is recalculated;

[0041] The fifth threshold is greater than the sixth threshold.

[0042] Furthermore, the controller is further configured to:

[0043] When the calculated temperature difference is not greater than the sixth threshold, calculating a duration during which the temperature difference is not greater than the sixth threshold;

[0044] When the calculated duration is not less than the preset second duration, the rotation speed of the outdoor fan is reduced by a preset ninth amplitude, the opening of the expansion valve is reduced by a preset tenth amplitude, and the temperature difference is recalculated.

[0045] An embodiment of the present invention further provides a temperature zone control method for an air conditioner, the air conditioner comprising:

[0046] a refrigerant circuit in which refrigerant circulates sequentially through 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;

[0047] An indoor fan, used to drive the indoor air to exchange heat with the indoor heat exchanger and then send it out from the air outlet;

[0048] An outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger;

[0049] Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil;

[0050] An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment;

[0051] Controller;

[0052] The method comprises:

[0053] Upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment;

[0054] When the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed;

[0055] Setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment;

[0056] When the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude;

[0057] When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, maintaining the outdoor fan and the expansion valve to operate with current parameters;

[0058] The first threshold is greater than the second threshold.

[0059] Compared with the prior art, the air conditioner and the temperature zone control method of the air conditioner disclosed by the present invention include: a refrigerant circuit, in which the refrigerant circulates through a compressor, a condenser, an expansion valve and an evaporator in sequence; one of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger; an outdoor fan is used to drive the outdoor air to exchange heat with the outdoor heat exchanger; an outdoor coil temperature sensor is used to detect the coil temperature of the outdoor coil; an outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment; a controller is configured to: obtain the outdoor temperature of the outdoor environment when receiving a preset temperature zone control instruction; when the outdoor temperature is When the temperature is within a preset outdoor normal temperature range, the outdoor fan is controlled to start at a preset high speed; the opening of the expansion valve is set to a preset first opening value, and the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment is calculated; when the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude; when the calculated temperature difference is less than the first threshold and not less than a preset second threshold, the outdoor fan and the expansion valve are kept running at the current parameters; wherein the first threshold is greater than the second threshold. This application can maximize the overall performance of the air conditioner, avoid energy waste, reduce shutdown protection, and maintain normal operation of the entire machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention in one implementation manner;

[0061] Figure 2 is a partial structural diagram of a refrigerant circuit of an air conditioner according to an embodiment of the present invention;

[0062] Figure 3 is a partial structural diagram of an air conditioner in another embodiment of the present invention;

[0063] Figure 4 1 is a schematic structural diagram of an outdoor heat exchanger provided in an embodiment of the present invention;

[0064] Figure 5 This is a flow chart of the work performed by the controller provided by the present invention in the first embodiment;

[0065] Figure 6 is a flowchart of specific execution steps of the controller provided by the present invention in the first embodiment;

[0066] Figure 7 is a flowchart of specific execution steps of the controller provided by the present invention in the second embodiment;

[0067] Figure 8 is a flowchart of specific execution steps of the controller provided by the present invention in the third embodiment;

[0068] Figure 9 is a flowchart of specific execution steps of the controller provided by the present invention in the fourth embodiment;

[0069] Figure 10 It is a flowchart of specific execution steps of the controller provided by the present invention in the fifth embodiment. DETAILED DESCRIPTION

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are also within the scope of protection of the present invention.

[0071] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0072] 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 the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0073] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0074] See also Figure 1, is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention under one embodiment. The embodiment of the present invention provides an air conditioner 100, comprising an indoor unit 110 and an outdoor unit 120. The indoor unit 110 is typically located indoors and may be in the form of an indoor wall-mounted unit, an indoor cabinet unit, or the like. The outdoor unit 120 is typically located outdoors and is used for heat exchange in the indoor environment. The air conditioner 100 has a refrigerant circuit 130. By circulating the refrigerant in the refrigerant circuit 130, a vapor compression refrigeration cycle can be performed. Connecting pipes are used to connect the indoor unit 110 and the outdoor unit 120 to form a refrigerant circuit for circulating the refrigerant.

[0075] See also Figure 2 , is a partial structural diagram of the refrigerant circuit of the air conditioner in an embodiment of the present invention. In this application, the air conditioner performs the refrigeration cycle of the air conditioner by using a compressor 131, an indoor heat exchanger 132, an expansion valve 133 and an outdoor heat exchanger 134. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the conditioned and heat-exchanged air. Among them, the indoor heat exchanger 132 is usually provided in the indoor unit 110, the compressor 131 and the outdoor heat exchanger 134 are usually provided in the outdoor unit 120, and the expansion valve 133 can be provided in the indoor unit 110 or the outdoor unit 120. The indoor heat exchanger 132 and the outdoor heat exchanger 134 serve as a condenser or an evaporator. When the indoor heat exchanger 132 serves as a condenser, the air conditioner serves as a heater in the heating mode, and when the indoor heat exchanger 132 serves as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0076] The outdoor heat exchanger of the air conditioner is equipped with an outdoor fan, and the indoor heat exchanger is equipped with an indoor fan.

[0077] Compressor 131 compresses high-temperature, high-pressure refrigerant gas and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, releasing heat to the surrounding environment through the condensation process. Expansion valve 133 expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in expansion valve 133 and returns the low-temperature, low-pressure refrigerant gas to compressor 131. The evaporator achieves a cooling effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. Throughout this cycle, the air conditioner can adjust the temperature of the indoor space.

[0078] Fixed-speed air conditioners are equipped with a fixed-speed compressor. During normal cooling operation, the outdoor fan speed and throttling effect are fixed and cannot be adjusted according to the outdoor ambient temperature or outdoor heat exchange efficiency. As a result, when the outdoor ambient temperature and outdoor heat exchange efficiency change, the air conditioner system fluctuates significantly, and the air conditioner cannot be stabilized within the appropriate condenser temperature range, thereby maximizing the overall performance of the air conditioner, resulting in significant energy waste. In extreme ambient temperatures, various protection measures may be triggered, causing the entire unit to malfunction. At the same time, the constant fluctuation of the air conditioner system will also affect the indoor heat exchange effect, thereby affecting user comfort.

[0079] In an embodiment provided by the present invention, the air conditioner comprises:

[0080] a refrigerant circuit in which refrigerant circulates sequentially through 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;

[0081] An indoor fan, used to drive the indoor air to exchange heat with the indoor heat exchanger and then send it out from the air outlet;

[0082] An outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger;

[0083] Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil;

[0084] An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment;

[0085] Controller;

[0086] Specifically, see Figure 3 , is a partial structural diagram of an air conditioner in another embodiment of the present invention. The air conditioner 100 includes a refrigerant circuit 130. The refrigerant in the refrigerant circuit 130 circulates through a compressor 131, an indoor heat exchanger 132, an expansion valve 133 and an outdoor heat exchanger 134 in sequence. One of the condenser and the evaporator is an outdoor heat exchanger, and the other is an indoor heat exchanger.

[0087] The air conditioner further includes an outdoor fan 301, which is configured and installed with the outdoor heat exchanger. The outdoor fan 301 is used to drive outdoor air to perform heat exchange with the outdoor heat exchanger.

[0088] The air conditioner further includes an outdoor coil temperature sensor 302, which is used to detect the temperature of the outdoor coil. The outdoor coil temperature sensor 302 is installed in the middle of the outdoor heat exchanger and can provide relatively accurate feedback on the condensing temperature of the outdoor heat exchanger. Figure 4 , is a schematic diagram of the structure of an outdoor heat exchanger provided by an embodiment of the present invention. The outdoor coil temperature sensor 302 is installed in the middle of the outdoor coil 401 and can accurately detect the condensing temperature of the outdoor coil.

[0089] The air conditioner further comprises an outdoor temperature sensor 303, which is used to detect the outdoor temperature of the outdoor environment. Figure 4 The outdoor temperature sensor 303 is placed on the upper part of the outdoor heat exchanger. A fixing buckle fixes the outdoor environment sensor and detects the ambient temperature by detecting its return air.

[0090] The air conditioner further includes a controller 140. Figure 5 , is a flow chart of the work performed by the controller provided by the present invention in the first embodiment; the controller is used to perform the following control steps:

[0091] Step S1, upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment;

[0092] Step S2, when the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed;

[0093] Step S3, setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment;

[0094] Step S4: when the calculated temperature difference is not less than a preset first threshold, increasing the speed of the outdoor fan by a preset first amplitude, and increasing the opening of the expansion valve by a preset second amplitude;

[0095] Step S5: When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, keep the outdoor fan and the expansion valve running with current parameters;

[0096] In the embodiment of the present invention, see Figure 6 , is a flowchart of the specific execution steps of the controller provided by the present invention in the first embodiment. The temperature zone control of the air conditioner requires the following steps.

[0097] Step S601: receiving a preset temperature zone control instruction. That is, upon receiving the preset temperature zone control instruction, performing temperature zone control in response to the temperature zone control instruction.

[0098] It should be noted that the temperature zone control instruction is specifically a trigger instruction set by the air conditioner for temperature zone control. It can be generated by the user actively triggering a button set on the remote control, or the controller can automatically trigger the generation of the temperature zone control instruction based on the execution conditions set by the user and when the current conditions meet the execution conditions. The execution conditions can specifically be an execution time interval, in which case the current condition is the current time.

[0099] Step S602: Obtain the outdoor temperature T of the outdoor environment w That is, the outdoor temperature at the current moment is obtained through the outdoor temperature sensor.

[0100] Step S603, determine the outdoor temperature T w Whether the temperature is within [21℃, 43℃);

[0101] It should be noted that in this embodiment, [21°C, 43°C) is used as the outdoor normal temperature range to illustrate the working principle of the controller. In other embodiments, the ambient temperature of the air conditioner is divided into temperature ranges according to different outdoor ambient temperatures, and the outdoor normal temperature range can be set to other values.

[0102] If yes, go to step S604;

[0103] Step S604, controlling the outdoor fan to start at a speed of 800 rpm;

[0104] Step S605, the opening of the expansion valve is set to 160 steps. That is, when the air conditioner is in the normal temperature range, the outdoor fan is started at high speed, and the opening of the expansion valve is 160 steps.

[0105] The speed of the outdoor fan can be freely switched between 0-890 rpm, with 800 rpm as high-speed wind, 700 rpm as medium-speed wind, and 460 rpm as low-speed wind. Since it is a variable frequency machine, its speed can be freely adjusted and calculated by proportion.

[0106] It should be noted that in this embodiment, 800 rpm is used as the high speed of the outdoor fan, and 160 steps is used as the first opening value of the expansion valve. In other embodiments, the high speed and the first opening value can be set to other values.

[0107] Step S606: Calculate the current temperature difference ΔT. That is, obtain the current coil temperature T of the outdoor coil. L And the current outdoor temperature T of the outdoor environment w ; Calculate the temperature difference ΔT between the current coil temperature and the current outdoor temperature, ΔT = T L -T w .

[0108] Step S607, determining whether the temperature difference ΔT ≥ 18°C ​​is established;

[0109] If yes, go to step S608;

[0110] If not, execute step S609;

[0111] Step S608: Increase the speed of the outdoor fan by 10%, increase the opening of the expansion valve by 10%, run for 5 minutes, and return to step S603.

[0112] It should be noted that, in this embodiment, 10% is used as the first amplitude and the second amplitude. In other embodiments, the first amplitude and the second amplitude can be set or adjusted according to actual conditions.

[0113] The outdoor coil temperature TL and the outdoor ambient temperature T w The system is judged by the temperature difference ΔT. When the temperature difference ΔT ≥ 18°C, it means that the system pressure is relatively high and the external fan speed needs to be increased quickly. The fan speed needs to be increased by a higher percentage and the opening of the electronic expansion valve needs to be increased to reduce the system pressure and make the temperature difference below 18°C ​​to ensure the safety and reliability of the system.

[0114] Step S609, determining whether 15≤ΔT<18°C holds;

[0115] If yes, go to step S610;

[0116] It should be noted that, in this embodiment, step S607 is executed first, and then step S609 is executed. In other embodiments, the order of executing step S607 and step S609 is not fixed. Step S609 may be executed first, and then step S607, or they may be executed simultaneously.

[0117] Step S610: Keep the outdoor fan and the expansion valve running at the current parameters for 5 minutes, and return to step S603.

[0118] It should be noted that in this embodiment, the first threshold and the second threshold are determined to be 18° C. and 15° C. respectively. In other embodiments, the first threshold and the second threshold can be adjusted according to actual conditions, but the first threshold is greater than the second threshold.

[0119] When cooling in the normal temperature range, since the air conditioner operates in this temperature range most of the time, the main purpose of the air conditioner operation is to maximize the heat exchange performance of the air conditioner while ensuring the system pressure is within a reasonable range, thereby improving the heat exchange capacity of the air conditioner. w It may change with the changes in the external environment. By calculating the temperature difference between the two, we can more accurately ensure that the heat exchange temperature difference between the two is within a reasonable range. For example, if T L The temperature is fixed in a range, for example, 50-61°C. At the beginning, Tw is 38℃, at this time T L is 55℃. Within this range, if T w Reduced to 22℃, then T L If it is still maintained at 50℃, the temperature difference between the two will be 28℃, which will greatly waste the optimal heat exchange temperature difference. L With T w The temperature difference between them can ensure the best heat exchange temperature difference and maximize the capabilities of the machine.

[0120] Therefore, it is necessary to ensure the outdoor coil temperature T L and outdoor ambient temperature T w There is a reasonable temperature difference range between them, so that the heat exchange effect of the outdoor heat exchanger can be maximized. When exchanging heat in the normal temperature zone, it is necessary to adjust the speed of the outdoor fan and the opening of the electronic expansion valve to make the outdoor coil temperature TL and the outdoor ambient temperature T w The temperature difference is kept at 15℃~18℃, at which time the maximum boundary value of the system pressure is when the outdoor ambient temperature T w At 43°C, the outdoor coil temperature T L The logical maximum temperature is 61°C. Software calculations and actual experimental data show that when the outdoor coil temperature TL is 61°C, the refrigerant pressure for R410A is 3.811 MPa, and the refrigerant pressure for R32 is 3.920 MPa. Both pressures never exceed 4.0 MPa, a relatively reasonable pressure range for normal air conditioner operation. This prevents frequent compressor starts and stops, minimizing compressor wear and extending the life of the compressor, thereby extending the life of the air conditioner.

[0121] In another embodiment of the present invention, the controller is further configured to:

[0122] When the calculated temperature difference is less than the second threshold and greater than a preset third threshold, the outdoor fan is kept running with current parameters, the opening of the expansion valve is reduced by a preset third amplitude, and the temperature difference is recalculated;

[0123] The second threshold is greater than the third threshold.

[0124] When implementing this embodiment, see Figure 7 , is a flow chart of the specific execution steps of the controller provided by the present invention in the second embodiment. The temperature zone control of the air conditioner requires the following steps.

[0125] When it is determined in step S609 of the previous embodiment that 15≤ΔT<18°C is not established, that is, when the determination result of step S609 is negative, step S701 is executed;

[0126] Step S701, determine whether 5<ΔT<15℃ is established;

[0127] If yes, go to step S702;

[0128] It should be noted that, in this embodiment, step S607 is executed first, then step S609, and then step S701. In other embodiments, the order of executing steps S607, S609, and S701 is not fixed and they may be executed simultaneously.

[0129] Step S702: Keep the outdoor fan running with the current parameters, and reduce the opening of the expansion valve by 5%, run for 5 minutes, and return to step S603.

[0130] It should be noted that in this embodiment, the second threshold and the third threshold are determined to be 15° C. and 5° C. respectively. In other embodiments, the second threshold and the third threshold can be adjusted according to actual conditions, but the second threshold is greater than the third threshold.

[0131] When the temperature difference ΔT is within the range of (5°C, 15°C), the system pressure, while low, remains within a relatively reasonable range. Therefore, the outdoor heat exchanger's heat transfer efficiency is maintained, and the system pressure is increased by reducing the valve opening. The speed will continue at the initial high-speed wind speed, with no speed adjustment. The valve opening will continue to decrease by 10 steps from the initial 160 steps.

[0132] In another embodiment of the present invention, the controller is further configured to:

[0133] When the calculated temperature difference is not greater than the third threshold, calculating a duration during which the temperature difference is not greater than the third threshold;

[0134] When the calculated duration is not less than the preset first duration, the rotation speed of the outdoor fan is reduced by a preset fourth amplitude, the opening of the expansion valve is reduced by a preset fifth amplitude, and the temperature difference is recalculated.

[0135] When implementing this embodiment, see Figure 7 , the temperature zone control of the air conditioner requires the following steps.

[0136] When it is determined in step S701 of the previous embodiment that 5<ΔT<15° C. is not established, that is, when the determination result of step S701 is no, step S703 is executed;

[0137] Step S703, calculating the duration t when the temperature difference ΔT≤5°C. That is, when the temperature difference ΔT≤5°C, calculating the duration t when the temperature difference ΔT≤5°C;

[0138] Step S704, determine whether the duration t≥3mins is established;

[0139] If not, return to step S703;

[0140] If yes, go to step S705;

[0141] It should be noted that, in this embodiment, step S607 is executed first, then step S609, then step S701, and finally step S703. In other embodiments, the order of executing steps S607, step S609, step S701 and step S703 is not fixed and can also be performed simultaneously.

[0142] Step S705: Reduce the speed of the outdoor fan by 3%, and reduce the opening of the expansion valve by 3%, run for 5 minutes, and return to step S603.

[0143] It should be noted that in this embodiment, the second threshold and the third threshold are determined to be 15° C. and 5° C. respectively. In other embodiments, the second threshold and the third threshold can be adjusted according to actual conditions, but the second threshold is greater than the third threshold.

[0144] It should be noted that, in this embodiment, 3% is used as the fourth amplitude and the fifth amplitude. In other embodiments, the fourth amplitude and the fifth amplitude can be set or adjusted according to actual conditions.

[0145] When the temperature difference is ≤5℃ and lasts for not less than 3 minutes, it means that the system pressure is at a low level and the heat exchange effect of the system's outdoor heat exchanger is too large. It is necessary to reduce the outdoor fan speed. Since a higher heat exchange is still required at this time, the fan speed needs to be reduced by a lower percentage and the valve opening needs to be reduced to increase the system pressure so that the compressor can perform its performance under reasonable pressure. It also means that a higher outdoor fan speed is not needed at this time. By reducing its speed, the power of the entire machine can be reduced, saving electricity.

[0146] In another embodiment of the present invention, the controller is further configured to:

[0147] When the outdoor temperature is within a preset outdoor high temperature range, the outdoor fan is controlled to start at a preset high speed, and after the outdoor fan is running, the speed of the outdoor fan is increased to a maximum speed;

[0148] Setting the opening of the expansion valve to a preset second opening value, and obtaining the coil temperature of the outdoor coil;

[0149] When the coil temperature is in a preset coil high temperature range, increasing the opening of the expansion valve to a maximum opening;

[0150] The outdoor high temperature range has no intersection with the outdoor normal temperature range, and the second opening value is higher than the first opening value.

[0151] As a preferred embodiment, see Figure 8 , is a flow chart of specific execution steps of the controller provided by the present invention in the third embodiment. The temperature zone control of the air conditioner requires the following steps.

[0152] In step S603, the outdoor temperature T is determined. w If the temperature is not within the range of [21°C, 43°C), that is, if the judgment result of step S603 is no, step S801 is executed;

[0153] Step S801, determine T w Whether it is within [43℃, +∞)?

[0154] If yes, go to step S802;

[0155] For outdoor ambient temperature T w According to different outdoor ambient temperatures, the ambient temperature of the air conditioner is divided into three temperature intervals, which are divided into high temperature zone (T w ≥43℃), normal temperature zone (21≤T w <43℃), low temperature zone (T w <21℃). Since the actual operating requirements of the air conditioner are different in different temperature ranges, it is necessary to continuously adjust the fan speed and the opening of the electronic expansion valve.

[0156] It should be noted that in this embodiment, [43°C, +∞) is used as the outdoor high temperature range to illustrate the working principle of the controller. In other embodiments, the ambient temperature of the air conditioner is divided into temperature ranges according to different outdoor ambient temperatures, and the outdoor high temperature range can be set to other values.

[0157] Step S802: Control the outdoor fan to start at a speed of 800 rpm, and after the outdoor fan is running, increase the speed of the outdoor fan to a maximum speed;

[0158] Step S803, the opening of the expansion valve is set to 250 steps. That is, when the air conditioner is in the normal temperature range, the outdoor fan is started at high speed and quickly increased to the maximum wind speed, and the opening of the expansion valve is 250 steps.

[0159] The speed of the outdoor fan can be freely switched between 0-890 rpm, with 800 rpm as high-speed wind, 700 rpm as medium-speed wind, and 460 rpm as low-speed wind. Since it is a variable frequency machine, its speed can be freely adjusted and calculated by proportion.

[0160] It should be noted that in this embodiment, 800 rpm is used as the high speed of the outdoor fan, and 250 steps is used as the second opening value of the expansion valve. In other embodiments, the high speed and the second opening value can be set to other values.

[0161] Step S804: Obtain the coil temperature T of the outdoor coil L .

[0162] Step S805: Determine the coil temperature T L Whether ≥65℃ is established;

[0163] If yes, go to step S806;

[0164] Step S806: Increase the opening of the expansion valve by the second amplitude, run for 5 minutes, and return to step S603.

[0165] It should be noted that, in this embodiment, 10% is used as the second amplitude. In other embodiments, the second amplitude can be set or adjusted according to actual conditions.

[0166] When operating the cooling system in a high temperature area, the high outdoor ambient temperature results in poor heat exchange in the system, which will cause a significant increase in system pressure. At this time, the main purpose of the air conditioner operation is to ensure that the system pressure is within a reasonable range, maximize the safety and stability of the air conditioner, and prevent the air conditioner from frequently starting the compressor due to excessive system pressure, causing significant changes in the heat exchange of the indoor heat exchanger, thereby affecting user comfort.

[0167] Therefore, when cooling in high temperature areas, the outdoor fan will start at high speed and reach the designed maximum operating speed in the shortest time, so that the heat exchange performance of the outdoor heat exchanger of the air conditioner can be brought into play to the greatest extent, and the system pressure can be reduced to the greatest extent, avoiding the following situation: when the air conditioner is turned on and running, the outdoor fan speed increases slowly, causing the system pressure to rise rapidly, causing the air conditioner to shut down due to system pressure protection and unable to operate normally. According to software calculations and actual experimental data, the outdoor coil temperature T L At 65℃, for traditional R410A refrigerant, the corresponding system pressure is about 4.163MPa, and for R32 refrigerant, the corresponding system pressure is about 4.284MPa. The system pressures at this time are relatively high. If the compressor is operated in a high temperature and high pressure environment for a long time, it will be detrimental to the compressor. It will wear out the compressor to the greatest extent, shorten the service life of the compressor, and thus shorten the service life of the air conditioner.

[0168] Therefore, the outdoor ambient temperature T wWhen the temperature is ≥43℃, the outdoor fan starts at high speed and quickly increases to the maximum design operating speed. The initial opening of the electronic expansion valve is 250 steps. Then the outdoor coil temperature T L When the outdoor coil temperature TL is ≥ 65°C, it indicates that the system pressure is high and the electronic expansion valve opening needs to be increased quickly to reduce throttling and thus lower the system pressure.

[0169] In another embodiment of the present invention, the controller is further configured to:

[0170] When the current coil temperature is not in the coil high temperature range, the outdoor fan and the expansion valve are kept operating with current parameters.

[0171] When implementing this embodiment, see Figure 8 In step S805 of the previous embodiment, the coil temperature T is determined. L When ≥65°C is not established, that is, when the judgment result of step S805 is no, step S807 is executed;

[0172] Step S807: Keep the outdoor fan and the expansion valve running at the current parameters for 5 minutes, and return to step S603.

[0173] When the outdoor coil temperature T L When the temperature is less than 65℃, it indicates that the system pressure is still within the allowable range and the system is operating normally according to the current speed and valve opening.

[0174] In another embodiment of the present invention, the controller is further configured to:

[0175] After the outdoor fan is started, re-obtaining the current outdoor temperature of the outdoor environment;

[0176] When the re-acquired current outdoor ambient temperature is still within the outdoor high temperature range, the rotational speed of the outdoor fan is increased to a maximum rotational speed.

[0177] In the specific implementation of this embodiment, after the outdoor fan is running, the controller increases the speed of the outdoor fan to the maximum speed, specifically including:

[0178] When the outdoor temperature detected by the outdoor temperature sensor reaches T w When the temperature is ≥43℃, the outdoor fan will be quickly started with high-speed wind as the target;

[0179] Then, the outdoor sensor is used to re-detect the current outdoor temperature of the outdoor environment. If the re-obtained current outdoor ambient temperature is still 43°C, the outdoor fan is directly operated at the maximum speed target of 890 rpm.

[0180] When cooling in high-temperature areas, the outdoor fan will start at high speed and reach the designed maximum operating speed in the shortest time, so that the heat exchange performance of the air conditioner's outdoor heat exchanger can be brought into play to the greatest extent and the system pressure can be reduced to the greatest extent.

[0181] In another embodiment of the present invention, the controller is further configured to:

[0182] When the outdoor temperature is within a preset low outdoor temperature range, the outdoor fan is controlled to start at a preset medium speed;

[0183] Setting the opening of the expansion valve to a preset third opening value, and calculating a temperature difference between a current coil temperature of the outdoor coil and a current outdoor temperature of the outdoor environment;

[0184] When the calculated temperature difference is not less than a preset fourth threshold, increasing the opening of the expansion valve by a preset sixth amplitude and recalculating the temperature difference;

[0185] When the calculated temperature difference is less than the fourth threshold value and not less than a preset fifth threshold value, the outdoor fan and the expansion valve are kept running with current parameters and the temperature difference is recalculated;

[0186] The third opening value is lower than the first opening value, and the fourth threshold is greater than the fifth threshold.

[0187] When implementing this embodiment, see Figure 9 , is a flow chart of the specific execution steps of the controller provided by the present invention in the fourth embodiment. The temperature zone control of the air conditioner requires the following steps.

[0188] In step S801, the outdoor temperature T is determined. w When the temperature is not [43°C, +∞), that is, when the judgment result of step S801 is no, step S901 is executed;

[0189] Step S901, control the outdoor fan to start at a speed of 700 rpm; that is, the outdoor temperature T w When the temperature is within (-∞, 21°C), the outdoor fan is controlled to start at a preset medium speed;

[0190] Step S902, the opening of the expansion valve is set to 130 steps. That is, when the air conditioner is in the low temperature range, the outdoor fan is started at a medium speed, and the opening of the expansion valve is 130 steps.

[0191] The speed of the outdoor fan can be freely switched between 0-890 rpm, with 800 rpm as high-speed wind, 700 rpm as medium-speed wind, and 460 rpm as low-speed wind. Since it is a variable frequency machine, its speed can be freely adjusted and calculated by proportion.

[0192] It should be noted that in this embodiment, 700 rpm is used as the medium speed of the outdoor fan, and 130 steps is used as the second opening value of the expansion valve. In other embodiments, the medium speed and the second opening value can be set to other values.

[0193] Step S903: Calculate the current temperature difference. That is, obtain the current coil temperature T of the outdoor coil. L And the current outdoor temperature T of the outdoor environment w ; Calculate the temperature difference ΔT between the current coil temperature and the current outdoor temperature, ΔT = T L -T w .

[0194] Step S904, determining whether the temperature difference ΔT ≥ 25°C is established;

[0195] If yes, go to step S905;

[0196] If not, execute step S906;

[0197] Step S905: Increase the opening of the expansion valve by 3%, run for 5 minutes, and return to step S603.

[0198] It should be noted that, in this embodiment, 3% is used as the sixth amplitude. In other embodiments, the sixth amplitude can be set or adjusted according to actual conditions.

[0199] When the temperature difference is ≥25℃, it means that the system pressure is relatively high. Since the outdoor ambient temperature Tw is not high, the reason why the system pressure is so high at this time is mainly because the opening of the electronic expansion valve is small, resulting in excessive system pressure. Therefore, the main thing is to increase the valve opening to reduce the system pressure and ensure the normal operation of the system.

[0200] Step S906, determining whether 15<ΔT<25℃ holds true;

[0201] If yes, go to step S907;

[0202] It should be noted that, in this embodiment, step S801 is executed first, and then step S901 is executed. In other embodiments, the order of executing step S801 and step S901 is not fixed. Step S801 may be executed first, and then step S901, or they may be executed simultaneously.

[0203] Step S907: Keep the outdoor fan and the expansion valve running at the current parameters for 5 minutes, and return to step S603.

[0204] When 15<ΔT<25℃, the system pressure is within a relatively reasonable range, which means that the compressor performance can be maximized and the system can operate normally and stably. At this time, the system operates according to the current speed and valve opening.

[0205] It should be noted that in this embodiment, the fourth threshold and the fifth threshold are respectively determined to be 25° C. and 15° C.; in other embodiments, the fourth threshold and the fifth threshold may be adjusted according to actual conditions, but the fourth threshold is greater than the fifth threshold.

[0206] When cooling in the low-temperature zone, the overall pressure of the air-conditioning system is low due to the low outdoor ambient temperature. In this temperature zone, the demand for the air-conditioning cooling capacity is relatively low. At this time, the main purpose of the air-conditioning system is to avoid the air-conditioning system pressure being too low, which cannot maximize the performance of the compressor and cause unnecessary energy waste. At the same time, since the outdoor heat exchanger of the air-conditioning system does not require too high a heat exchange capacity at this time, the speed of the outdoor fan can be appropriately reduced, which not only increases the system pressure, but also reduces the motor power by reducing the speed, thereby reducing the power of the entire machine and saving electricity.

[0207] In another embodiment of the present invention, the controller is further configured to:

[0208] When the calculated temperature difference is less than the fifth threshold value and greater than a preset sixth threshold value, the speed of the outdoor fan is reduced by a preset seventh amplitude, the opening of the expansion valve is reduced by a preset eighth amplitude, and the temperature difference is recalculated;

[0209] The fifth threshold is greater than the sixth threshold.

[0210] When implementing this embodiment, see Figure 10 , is a flowchart of the specific execution steps of the controller provided by the present invention in the fifth embodiment. The temperature zone control of the air conditioner requires the following steps.

[0211] When it is determined in step S906 of the previous embodiment that 15<ΔT<25° C. is not established, that is, when the determination result of step S906 is negative, step S1001 is executed;

[0212] Step S1001, determine whether 5<ΔT<15℃ is established;

[0213] If yes, execute step S1002;

[0214] It should be noted that, in this embodiment, step S904 is executed first, then step S906, and then step S1001. In other embodiments, the order of executing steps S904, S906, and S1001 is not fixed and they can be performed simultaneously.

[0215] Step S1002, reducing the rotation speed of the outdoor fan by 5%, and reducing the opening of the expansion valve by 5%, running for 5 minutes, and returning to step S603.

[0216] It should be noted that, in this embodiment, the fifth threshold and the sixth threshold are respectively determined to be 15° C. and 5° C.; in other embodiments, the fifth threshold and the sixth threshold may be adjusted according to actual conditions, but the fifth threshold is greater than the sixth threshold.

[0217] When the temperature difference ΔT is in the range of (5℃, 15℃), it means that the system pressure is at a relatively low level. The outdoor fan speed can be reduced by a lower percentage. The air conditioner system pressure can be increased by quickly reducing the outdoor fan speed and reducing the valve opening. At this time, the speed will slowly decrease to the low-speed wind block according to the starting medium-speed wind, and will be reduced by 5% of the medium-speed wind. At the same time, the valve opening will be reduced by 10 steps based on the initial 130 steps.

[0218] In another embodiment of the present invention, the controller is further configured to:

[0219] When the calculated temperature difference is not greater than the sixth threshold, calculating a duration during which the temperature difference is not greater than the sixth threshold;

[0220] When the calculated duration is not less than the preset second duration, the rotation speed of the outdoor fan is reduced by a preset ninth amplitude, the opening of the expansion valve is reduced by a preset tenth amplitude, and the temperature difference is recalculated.

[0221] When implementing this embodiment, see Figure 10 , the temperature zone control of the air conditioner requires the following steps.

[0222] When it is determined in step S1001 of the previous embodiment that 5<ΔT<15° C. is not established, that is, when the determination result of step S1001 is no, step S1003 is executed;

[0223] Step S1003, calculating the duration t when the temperature difference ΔT≤5°C. That is, when the temperature difference ΔT≤5°C, calculating the duration t when the temperature difference ΔT≤5°C;

[0224] Step S1004, determine whether the duration t≥2mins is established;

[0225] If not, return to step S1003;

[0226] If yes, execute step S1005;

[0227] It should be noted that in this embodiment, step S904 is executed first, then step S906, then step S1001, and then step S1003. In other embodiments, the order of executing steps S904, step S906, step S1001 and step S1003 is not fixed and can also be performed simultaneously.

[0228] Step S1005: Reduce the speed of the outdoor fan by 5%, and reduce the opening of the expansion valve by 5%, run for 5 minutes, and return to step S603.

[0229] It should be noted that, in this embodiment, the sixth threshold is determined to be 5° C.; in other embodiments, the sixth threshold may be adjusted according to actual conditions.

[0230] It should be noted that, in this embodiment, 5% is used as the ninth amplitude and the tenth amplitude. In other embodiments, the ninth amplitude and the tenth amplitude can be set or adjusted according to actual conditions.

[0231] When the temperature difference is ≤5℃ and lasts for not less than 2 minutes, it means that the system pressure is at a low level. In order to increase the system pressure and reduce the operating power of the air conditioner and save electricity, the outdoor fan speed can be reduced by a higher percentage to quickly reduce the outdoor fan speed and reduce the valve opening.

[0232] An embodiment of the present invention further provides a temperature zone control method for an air conditioner, which is applied to an air conditioner, wherein the air conditioner includes a refrigerant circuit, wherein a refrigerant circulates sequentially through 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;

[0233] An indoor fan, used to drive the indoor air to exchange heat with the indoor heat exchanger and then send it out from the air outlet;

[0234] An outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger;

[0235] Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil;

[0236] An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment;

[0237] Controller;

[0238] The method comprises:

[0239] Upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment;

[0240] When the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed;

[0241] Setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment;

[0242] When the calculated temperature difference is not less than a preset first threshold, the rotation speed of the outdoor fan is increased by a preset first amplitude, the opening of the expansion valve is increased by a preset second amplitude, and the temperature difference is recalculated;

[0243] When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, the outdoor fan and the expansion valve are kept running with current parameters and the temperature difference is recalculated;

[0244] The first threshold is greater than the second threshold.

[0245] It should be noted that the temperature zone control method for an air conditioner provided in an embodiment of the present invention has the same process steps as those executed by the controller of an air conditioner in the above embodiment, and the working principles and beneficial effects of the two correspond one to one, so they will not be repeated here.

[0246] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium, and when executed, the program can include the processes in the above-described method embodiments. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0247] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also regarded as the protection range of the present invention.

Claims

1. An air conditioner, characterized in that: include: a refrigerant circuit in which refrigerant circulates sequentially through 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 outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger; Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil; An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment; The controller is configured as: Upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment; When the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed; Setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment; When the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude; When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, maintaining the outdoor fan and the expansion valve to operate with current parameters; wherein the first threshold is greater than the second threshold; The controller is further configured to: When the outdoor temperature is within a preset outdoor high temperature range, the outdoor fan is controlled to start at a preset high speed, and after the outdoor fan is running, the speed of the outdoor fan is increased to a maximum speed; Setting the opening of the expansion valve to a preset second opening value, and obtaining the coil temperature of the outdoor coil; When the coil temperature is in a preset coil high temperature range, increasing the opening of the expansion valve by the second amplitude; The outdoor high temperature range has no intersection with the outdoor normal temperature range, and the second opening value is higher than the first opening value.

2. The air conditioner according to claim 1, wherein The controller is further configured to: When the calculated temperature difference is less than the second threshold and greater than a preset third threshold, the outdoor fan is kept running with current parameters, the opening of the expansion valve is reduced by a preset third amplitude, and the temperature difference is recalculated; The second threshold is greater than the third threshold.

3. The air conditioner according to claim 2, wherein: The controller is further configured to: When the calculated temperature difference is not greater than the third threshold, calculating a duration during which the temperature difference is not greater than the third threshold; When the calculated duration is not less than the preset first duration, the rotation speed of the outdoor fan is reduced by a preset fourth amplitude, the opening of the expansion valve is reduced by a preset fifth amplitude, and the temperature difference is recalculated.

4. The air conditioner according to claim 1, wherein The controller is further configured to: When the current coil temperature is not in the coil high temperature range, the outdoor fan and the expansion valve are kept operating with current parameters.

5. The air conditioner according to claim 1, wherein The controller is further configured to: After the outdoor fan is started, re-obtaining the current outdoor temperature of the outdoor environment; When the re-acquired current outdoor ambient temperature is still within the outdoor high temperature range, the rotational speed of the outdoor fan is increased to a maximum rotational speed.

6. The air conditioner according to claim 1, wherein: The controller is further configured to: When the outdoor temperature is within a preset low outdoor temperature range, the outdoor fan is controlled to start at a preset medium speed; Setting the opening of the expansion valve to a preset third opening value, and calculating a temperature difference between a current coil temperature of the outdoor coil and a current outdoor temperature of the outdoor environment; When the calculated temperature difference is not less than a preset fourth threshold, increasing the opening of the expansion valve by a preset sixth amplitude and recalculating the temperature difference; When the calculated temperature difference is less than the fourth threshold value and not less than a preset fifth threshold value, the outdoor fan and the expansion valve are kept running with current parameters and the temperature difference is recalculated; The third opening value is lower than the first opening value, and the fourth threshold is greater than the fifth threshold.

7. The air conditioner according to claim 6, wherein: The controller is further configured to: When the calculated temperature difference is less than the fifth threshold value and greater than a preset sixth threshold value, the speed of the outdoor fan is reduced by a preset seventh amplitude, the opening of the expansion valve is reduced by a preset eighth amplitude, and the temperature difference is recalculated; The fifth threshold is greater than the sixth threshold.

8. The air conditioner according to claim 7, wherein: The controller is further configured to: When the calculated temperature difference is not greater than the sixth threshold, calculating a duration during which the temperature difference is not greater than the sixth threshold; When the calculated duration is not less than the preset second duration, the rotation speed of the outdoor fan is reduced by a preset ninth amplitude, the opening of the expansion valve is reduced by a preset tenth amplitude, and the temperature difference is recalculated.

9. A method for controlling temperature zones of an air conditioner, characterized in that: The air conditioner comprises: a refrigerant circuit in which refrigerant circulates sequentially through 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 indoor fan, used to drive the indoor air to exchange heat with the indoor heat exchanger and then send it out from the air outlet; An outdoor fan, used to drive outdoor air to perform heat exchange with the outdoor heat exchanger; Outdoor coil temperature sensor, used to detect the coil temperature of the outdoor coil; An outdoor temperature sensor is used to detect the outdoor temperature of the outdoor environment; Controller; The method comprises: Upon receiving a preset temperature zone control instruction, obtaining the outdoor temperature of the outdoor environment; When the outdoor temperature is within a preset outdoor normal temperature range, controlling the outdoor fan to start at a preset high speed; Setting the opening of the expansion valve to a preset first opening value, and calculating the temperature difference between the current coil temperature of the outdoor coil and the current outdoor temperature of the outdoor environment; When the calculated temperature difference is not less than a preset first threshold, the speed of the outdoor fan is increased by a preset first amplitude, and the opening of the expansion valve is increased by a preset second amplitude; When the calculated temperature difference is less than the first threshold value and not less than a preset second threshold value, maintaining the outdoor fan and the expansion valve to operate with current parameters; wherein the first threshold is greater than the second threshold; When the outdoor temperature is within a preset outdoor high temperature range, the outdoor fan is controlled to start at a preset high speed, and after the outdoor fan is running, the speed of the outdoor fan is increased to a maximum speed; Setting the opening of the expansion valve to a preset second opening value, and obtaining the coil temperature of the outdoor coil; When the coil temperature is in a preset coil high temperature range, increasing the opening of the expansion valve by the second amplitude; The outdoor high temperature range has no intersection with the outdoor normal temperature range, and the second opening value is higher than the first opening value.

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