Air conditioner and control method and device of outdoor fan thereof

Abstract

The application discloses an air conditioner and a control method and device of an outdoor fan thereof, and the method comprises the following steps: acquiring the temperature of an outdoor heat exchanger; determining the temperature change condition of different time intervals according to the temperature of the outdoor heat exchanger; and generating a fan rotating speed control parameter according to the temperature change condition of the different time intervals to perform a transition response control on the outdoor fan. According to the control method, the transition response control is performed on the outdoor fan according to the temperature of the outdoor heat exchanger, the followability and stability of the outdoor fan are improved, the problems of the air conditioner capacity and comfort reduction caused by the pressure variation and excessive protection control due to the fan vibration are avoided.

Description

Technical Field

[0001] This invention relates to the field of household appliance technology, and in particular to a control method for an outdoor fan in an air conditioner, a control device for an outdoor fan in an air conditioner, an air conditioner, and a computer-readable storage medium. Background Technology

[0002] When the outdoor fan is in cooling mode, commercial air conditioners, typically used in office buildings, are equipped with pressure sensors to monitor the high-pressure of the outdoor heat exchanger. Based on the difference between the detected high-pressure and the target high-pressure value, the fan speed is adjusted to increase or decrease, allowing for constant high-pressure target control. However, residential air conditioners, due to cost constraints, do not have expensive pressure sensors and cannot detect pressure. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, the first objective of this invention is to propose a control method for an outdoor fan in an air conditioner. This method determines the temperature changes over different time intervals based on the temperature of the outdoor heat exchanger and generates fan speed control parameters based on these temperature changes. This provides transient response control for the outdoor fan, improving its responsiveness and stability, and avoiding pressure fluctuations and excessive protective control caused by fan vibration, which could lead to reduced air conditioner capacity and comfort.

[0004] The second objective of this invention is to provide a control device for the outdoor fan in an air conditioner.

[0005] The third objective of this invention is to provide an air conditioner.

[0006] The fourth objective of this invention is to provide a computer-readable storage medium.

[0007] To achieve the above objectives, a first aspect of the present invention provides a control method for an outdoor fan in an air conditioner, comprising: acquiring the temperature of an outdoor heat exchanger; determining temperature changes over different time intervals based on the temperature of the outdoor heat exchanger; and generating fan speed control parameters based on the temperature changes over different time intervals to perform transient response control on the outdoor fan.

[0008] According to the control method for the outdoor fan in an air conditioner of the present invention, the temperature of the outdoor heat exchanger is first acquired. Then, the temperature change at different time intervals is determined based on the temperature of the outdoor heat exchanger. Finally, fan speed control parameters are generated based on the temperature change at different time intervals to perform transient response control on the outdoor fan. Therefore, this method performs transient response control on the outdoor fan based on the temperature of the outdoor heat exchanger, improving the responsiveness and stability of the outdoor fan and avoiding problems such as pressure fluctuations and excessive protective control caused by fan vibration, which lead to reduced air conditioner capacity and comfort.

[0009] In addition, the control method for the outdoor fan in the air conditioner according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to one embodiment of the present invention, when the air conditioner is running in cooling mode, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. This includes: determining a temperature change value over a first time interval when the temperature of the outdoor heat exchanger is lower than a preset protection temperature; determining a temperature change value over a second time interval when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, wherein the second time interval is greater than the first time interval; and controlling the outdoor fan to maintain its current speed when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range.

[0011] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: increasing the outdoor fan speed by a first preset step size when the temperature change value over the first time interval is greater than or equal to the upper limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range; and decreasing the outdoor fan speed by a first preset step size when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range. The absolute values ​​of the upper and lower limits of the first preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference range are equal.

[0012] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over the second time interval is greater than or equal to the upper limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference interval, increasing the speed of the outdoor fan by a second preset step size, wherein the second preset step size is less than the first preset step size; and when the temperature change value over the second time interval is less than or equal to the lower limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference interval, decreasing the speed of the outdoor fan by a second preset step size, wherein the absolute values ​​of the upper and lower limits of the third preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference interval are equal.

[0013] According to one embodiment of the present invention, when the temperature of the outdoor heat exchanger is greater than or equal to a preset protection temperature, the outdoor fan is controlled to operate at a preset maximum speed.

[0014] According to one embodiment of the present invention, when the air conditioner is running in heating mode, the outdoor ambient temperature is also acquired, and when the outdoor ambient temperature is greater than or equal to a preset upper limit outdoor ambient temperature, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan, including: determining the temperature change value over a first time interval; when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, determining the temperature change value over a second time interval, wherein the second time interval is greater than the first time interval; when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range, controlling the outdoor fan to maintain its current speed unchanged.

[0015] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over the first time interval is greater than or equal to the upper limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range, decreasing the speed of the outdoor fan by a first preset step size; and when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, increasing the speed of the outdoor fan by a first preset step size, wherein the absolute values ​​of the upper and lower limits of the first preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference range are equal.

[0016] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over the second time interval is greater than or equal to the upper limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference interval, decreasing the speed of the outdoor fan by a second preset step size, wherein the second preset step size is smaller than the first preset step size; and when the temperature change value over the second time interval is less than or equal to the lower limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference interval, increasing the speed of the outdoor fan by a second preset step size, wherein the absolute values ​​of the upper and lower limits of the third preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference interval are equal.

[0017] According to one embodiment of the present invention, when the outdoor ambient temperature is lower than a preset upper limit outdoor ambient temperature, the outdoor fan is controlled to operate at a preset maximum speed.

[0018] According to an embodiment of the present invention, the above-described method for controlling the outdoor fan in an air conditioner further includes: acquiring the temperature of an indoor heat exchanger; determining a pressure ratio based on the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger; and controlling the rotational speed of the outdoor fan based on the pressure ratio at different time intervals when the pressure ratio is less than or equal to a first preset ratio.

[0019] According to one embodiment of the present invention, controlling the rotational speed of the outdoor fan based on pressure ratios at different time intervals includes: increasing the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a second preset ratio and less than or equal to the first preset ratio; decreasing the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a third preset ratio, wherein the third preset ratio is less than the second preset ratio; and determining the pressure ratio of the second time interval when the pressure ratio of the first time interval is less than or equal to the third preset ratio, and controlling the rotational speed of the outdoor fan based on the pressure ratio of the second time interval, wherein the second time interval is greater than the first time interval.

[0020] According to one embodiment of the present invention, controlling the rotational speed of the outdoor fan based on the pressure ratio of the second time interval includes: when the pressure ratio of the second time interval is greater than a fourth preset ratio and less than or equal to the second preset ratio, increasing the rotational speed of the outdoor fan by a second preset step size, wherein the second preset step size is less than a first preset step size, and the fourth preset ratio is greater than the third preset ratio; when the pressure ratio of the second time interval is greater than or equal to the third preset ratio and less than a fifth preset ratio, decreasing the rotational speed of the outdoor fan by a second preset step size, wherein the fifth preset ratio is less than the fourth preset ratio; and when the pressure ratio of the second time interval is greater than or equal to the fifth preset ratio and less than or equal to the fourth preset ratio, controlling the outdoor fan to maintain its current rotational speed.

[0021] According to one embodiment of the present invention, when the pressure ratio is greater than a first preset ratio, the outdoor fan is controlled to operate at a preset maximum speed.

[0022] To achieve the above objectives, a second aspect of the present invention provides a control device for an outdoor fan in an air conditioner, comprising: a first temperature acquisition module for acquiring the temperature of an outdoor heat exchanger and determining temperature changes at different time intervals based on the temperature of the outdoor heat exchanger; and a control module for generating fan speed control parameters based on the temperature changes at different time intervals to perform transient response control on the outdoor fan.

[0023] According to an embodiment of the present invention, the control device for the outdoor fan in an air conditioner acquires the temperature of the outdoor heat exchanger through a first temperature acquisition module, determines the temperature change over different time intervals based on the temperature of the outdoor heat exchanger, and generates fan speed control parameters based on the temperature change over different time intervals to perform transient response control on the outdoor fan. Therefore, this device performs transient response control on the outdoor fan based on the temperature of the outdoor heat exchanger, improving the responsiveness and stability of the outdoor fan, and avoiding problems such as pressure fluctuations caused by fan vibration, excessive protective control, and consequently, reduced air conditioner capacity and comfort.

[0024] In addition, the control device for the outdoor fan in the air conditioner according to the above embodiments of the present invention may also have the following additional technical features:

[0025] According to one embodiment of the present invention, when the air conditioner is running in cooling mode, the control module generates fan speed control parameters based on temperature changes over different time intervals to perform transient response control on the outdoor fan. Specifically, it is used to: determine a temperature change value over a first time interval when the temperature of the outdoor heat exchanger is lower than a preset protection temperature; determine a temperature change value over a second time interval when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, wherein the second time interval is greater than the first time interval; and control the outdoor fan to maintain its current speed when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range.

[0026] According to one embodiment of the present invention, the control module generates fan speed control parameters based on temperature changes over different time intervals to perform transient response control on the outdoor fan. It is further configured to: increase the outdoor fan speed by a first preset step size when the temperature change value over the first time interval is greater than or equal to the upper limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range; and decrease the outdoor fan speed by a first preset step size when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, wherein the absolute values ​​of the upper and lower limits of the first preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference range are equal.

[0027] According to one embodiment of the present invention, the control module generates fan speed control parameters based on temperature changes over different time intervals to perform transient response control on the outdoor fan. It is further configured to: increase the outdoor fan speed by a second preset step size when the temperature change value over the second time interval is greater than or equal to the upper limit of the third preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference range, wherein the second preset step size is less than the first preset step size; and decrease the outdoor fan speed by a second preset step size when the temperature change value over the second time interval is less than or equal to the lower limit of the third preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference range, wherein the absolute values ​​of the upper and lower limits of the third preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference range are equal.

[0028] According to one embodiment of the present invention, the control module is further configured to control the outdoor fan to operate at a preset maximum speed when the temperature of the outdoor heat exchanger is greater than or equal to a preset protection temperature.

[0029] According to an embodiment of the present invention, the control device for the outdoor fan in the air conditioner further includes: a second temperature acquisition module, the second temperature acquisition module being used to acquire the outdoor ambient temperature when the air conditioner is running in heating mode; the control module generating fan speed control parameters based on temperature changes over different time intervals when the outdoor ambient temperature is greater than or equal to a preset upper limit outdoor ambient temperature, to perform transient response control on the outdoor fan, specifically being used to: determine the temperature change value over a first time interval; determine the temperature change value over a second time interval when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, wherein the second time interval is greater than the first time interval; and control the outdoor fan to maintain its current speed unchanged when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range.

[0030] According to one embodiment of the present invention, the control module generates fan speed control parameters based on temperature changes over different time intervals to perform transient response control on the outdoor fan. It is further configured to: reduce the speed of the outdoor fan by a first preset step size when the temperature change value over the first time interval is greater than or equal to the upper limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range; and increase the speed of the outdoor fan by a first preset step size when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, wherein the absolute values ​​of the upper and lower limits of the first preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference range are equal.

[0031] According to one embodiment of the present invention, the control module generates fan speed control parameters based on temperature changes over different time intervals to perform transient response control on the outdoor fan. It is further configured to: reduce the outdoor fan speed by a second preset step size when the temperature change value over the second time interval is greater than or equal to the upper limit of the third preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference range, wherein the second preset step size is less than the first preset step size; and increase the outdoor fan speed by a second preset step size when the temperature change value over the second time interval is less than or equal to the lower limit of the third preset temperature difference range or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference range, wherein the absolute values ​​of the upper and lower limits of the third preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference range are equal.

[0032] According to one embodiment of the present invention, the control module is further configured to control the outdoor fan to operate at a preset maximum speed when the outdoor ambient temperature is less than a preset upper limit outdoor ambient temperature.

[0033] According to an embodiment of the present invention, the control device for the outdoor fan in the air conditioner described above further includes: a third temperature acquisition module, the third temperature acquisition module being used to acquire the temperature of the indoor heat exchanger; the control module is further used to determine a pressure ratio based on the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger, and when the pressure ratio is less than or equal to a first preset ratio, to control the rotation speed of the outdoor fan according to the pressure ratio at different time intervals.

[0034] According to one embodiment of the present invention, the control module controls the rotational speed of the outdoor fan according to the pressure ratio of different time intervals, specifically configured to: increase the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a second preset ratio and less than or equal to the first preset ratio; decrease the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a third preset ratio, wherein the third preset ratio is less than the second preset ratio; and determine the pressure ratio of the second time interval when the pressure ratio of the first time interval is less than or equal to the third preset ratio, and control the rotational speed of the outdoor fan according to the pressure ratio of the second time interval, wherein the second time interval is greater than the first time interval.

[0035] According to one embodiment of the present invention, the control module controls the rotational speed of the outdoor fan based on the pressure ratio of the second time interval, specifically configured to: increase the rotational speed of the outdoor fan by a second preset step size when the pressure ratio of the second time interval is greater than a fourth preset ratio and less than or equal to the second preset ratio, wherein the second preset step size is less than the first preset step size, and the fourth preset ratio is greater than the third preset ratio; decrease the rotational speed of the outdoor fan by a second preset step size when the pressure ratio of the second time interval is greater than or equal to the third preset ratio and less than a fifth preset ratio, wherein the fifth preset ratio is less than the fourth preset ratio; and control the outdoor fan to maintain its current rotational speed when the pressure ratio of the second time interval is greater than or equal to the fifth preset ratio and less than or equal to the fourth preset ratio.

[0036] According to one embodiment of the present invention, the control module is further configured to control the outdoor fan to operate at a preset maximum speed when the pressure ratio is greater than a first preset ratio.

[0037] To achieve the above objectives, a third aspect of the present invention provides an air conditioner, including a memory, a processor, and a control program for an outdoor fan in the air conditioner stored in the memory and executable on the processor. When the processor executes the control program for the outdoor fan in the air conditioner, it implements the above-described control method for the outdoor fan in the air conditioner.

[0038] According to the air conditioner of the present invention, when the processor executes the control program of the outdoor fan in the air conditioner, the above-mentioned control method of the outdoor fan in the air conditioner is realized, which improves the responsiveness and stability of the outdoor fan and avoids the problems of reduced air conditioner capacity and reduced comfort caused by pressure fluctuations and excessive protection control due to fan vibration.

[0039] To achieve the above objectives, a fourth aspect of the present invention provides a computer-readable storage medium storing a control program for an outdoor fan in an air conditioner, wherein the control program for the outdoor fan in the air conditioner, when executed by a processor, implements the above-described control method for the outdoor fan in the air conditioner.

[0040] According to an embodiment of the present invention, a computer-readable storage medium implements the above-described control method for an outdoor fan in an air conditioner by executing a control program for an outdoor fan in an air conditioner stored thereon via a processor. This improves the responsiveness and stability of the outdoor fan and avoids problems such as reduced air conditioner capacity and decreased comfort caused by pressure fluctuations and excessive protective control due to fan vibration.

[0041] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0042] Figure 1 This is a flowchart of a control method for an outdoor fan in an air conditioner according to an embodiment of the present invention;

[0043] Figure 2 This is a schematic diagram of an air conditioner according to an embodiment of the present invention;

[0044] Figure 3 This is a schematic diagram of the plate fins of a heat exchanger according to a specific embodiment of the present invention;

[0045] Figure 4 for Figure 3 A partial schematic diagram along the AA direction;

[0046] Figure 5 A Morrill line graph according to an embodiment of the present invention;

[0047] Figure 6 This is a time-varying graph of high pressure and condensation temperature according to an embodiment of the present invention;

[0048] Figure 7 A time variation graph of condensing temperature and fan control according to an embodiment of the present invention.

[0049] Figure 8 This is a control flowchart of an outdoor fan in cooling mode according to a specific embodiment of the present invention;

[0050] Figure 9 This is a control flowchart of an outdoor fan in heating mode according to a specific embodiment of the present invention;

[0051] Figure 10 This is a control flowchart of an outdoor fan under pressure ratio protection according to a specific embodiment of the present invention;

[0052] Figure 11 This is a block diagram of the control device for the outdoor fan in an air conditioner according to an embodiment of the present invention;

[0053] Figure 12 This is a block diagram of an air conditioner according to an embodiment of the present invention. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] The following description, with reference to the accompanying drawings, outlines an embodiment of the present invention, including a control method for an outdoor fan in an air conditioner, a control device for an outdoor fan in an air conditioner, an air conditioner, and a computer-readable storage medium.

[0056] Figure 1 This is a flowchart of a control method for an outdoor fan in an air conditioner according to an embodiment of the present invention.

[0057] In one embodiment of the present invention, such as Figure 2 As shown, the air conditioner may include an outdoor unit 100 and an indoor unit 200, which are connected by a liquid piping 300 and a gas piping 400 to form a refrigerant circulation loop. The outdoor unit 100 may include an outdoor gas preventer valve 101, a four-way valve 102, a liquid receiver 103, a compressor 104, an outdoor heat exchanger 105, an outdoor fan 106, an expansion valve 107, and an outdoor liquid preventer valve 108. The indoor unit 200 may include an indoor liquid connection port 201, an indoor heat exchanger 202, an indoor fan 203, and an indoor gas connection port 204. The two ends of the liquid piping 300 are connected to the outdoor liquid preventer valve 108 and the indoor liquid connection port 201, respectively, and the two ends of the gas piping 400 are connected to the indoor gas connection port 204 and the outdoor gas preventer valve 101, respectively.

[0058] The aforementioned four-way valve 102 includes four ports A, B, C, and D, which are respectively connected to the outdoor gas prevention valve 101, the liquid receiver 103, the compressor 104, and the outdoor heat exchanger 105 via pipes, thereby controlling the refrigerant flow direction. The compressor 104 is a driven fluid machine used to upgrade low-pressure gaseous refrigerant to high-pressure gaseous refrigerant. It draws in low-temperature, low-pressure gaseous refrigerant through the suction pipe, and then compresses it by driving the piston through the operation of the motor, discharging high-temperature, high-pressure gaseous refrigerant through the discharge pipe, and providing power for the refrigeration cycle.

[0059] The following continues to refer to... Figure 2The cooling and heating modes of the air conditioner are described in detail.

[0060] When the air conditioner is in cooling mode, gaseous refrigerant enters through the suction port of compressor 104 and is compressed into high-temperature, high-pressure gaseous refrigerant by the piston. This gaseous refrigerant is then discharged through the discharge pipe of compressor 104. Ports C and D of the four-way valve 102 are connected, allowing the high-temperature, high-pressure gaseous refrigerant to flow to the outdoor heat exchanger 105 (which acts as a condenser). There, it exchanges heat with the surrounding air through the outdoor fan 106, condensing into liquid refrigerant. The liquid refrigerant is then depressurized at the expansion valve 107, becoming a two-phase gas-liquid mixture. It then flows through the outdoor anti-drying valve 5 to the outdoor unit 100 and through the liquid distribution pipe 300 to the indoor liquid connection port 201 at the other end. The liquid refrigerant then enters the indoor unit 200 through the indoor liquid connection port 201, enters the indoor heat exchanger 202 (which acts as an evaporator), and exchanges heat with the surrounding air through the indoor fan 203, evaporating into gaseous refrigerant. During this process, the heat in the indoor air is carried away as the liquid refrigerant vaporizes, causing the indoor temperature to drop and thus achieving the purpose of cooling. At this time, the gaseous refrigerant flows out of the indoor unit 200 through the indoor gas connection port 204, and then through the gas piping 400. After passing through the outdoor gas prevention valve 101, port A and port B of the four-way valve, it enters the liquid receiver 103 and returns to the compressor 104, thus forming a complete refrigerant working loop, and thus achieving the cooling work in this cycle.

[0061] When the air conditioner is in heating mode, gaseous refrigerant enters through the suction port of compressor 104 and is compressed into high-temperature, high-pressure gaseous refrigerant by the piston. This gaseous refrigerant is then discharged through the discharge pipe of compressor 104. Ports C and A of the four-way valve 102 are connected. The high-temperature, high-pressure gaseous refrigerant passes through the outdoor gas prevention valve 101 and gas piping 400 to the indoor gas connection port 204, and flows into the indoor heat exchanger 202 (which acts as the condenser) inside the indoor unit 200. It then exchanges heat with the surrounding air through the indoor fan 203, condensing into liquid refrigerant. During this process, the heat released during refrigerant condensation increases the heat of the surrounding air, raising the indoor temperature and thus achieving the heating purpose. Subsequently, the liquid refrigerant flows out of the indoor unit 200 through the indoor liquid connection port 201, flows through the liquid piping 300 to the outdoor anti-refrigerant valve 108 at the other end, and enters the outdoor unit 100. The liquid refrigerant flows into the outdoor heat exchanger 105 (which is the evaporator at this time) through the expansion valve 107, and exchanges heat with the surrounding air through the outdoor fan 106. The liquid refrigerant evaporates into gaseous refrigerant. The gaseous refrigerant flows into the liquid receiver 103 through the ports D and B of the four-way valve 102, and then returns to the compressor 104, thus forming a complete refrigerant working loop. This cycle is used to achieve heating.

[0062] Furthermore, the aforementioned indoor and outdoor heat exchangers can employ traditional plate-fin heat exchangers, microchannel heat exchangers, or plate-fin stacked heat exchangers, etc. Microchannel heat exchangers and plate-fin stacked heat exchangers have smaller internal volumes compared to traditional plate-fin heat exchangers. For example, the structure of the plates and fins that make up a plate-fin stacked heat exchanger is as follows... Figure 3 and Figure 4 As shown, the plate fin is a structure formed by joining two aluminum sheets together. By channeling the refrigerant through tiny flow paths of approximately several thousand to several hundred micrometers, it achieves high heat transfer performance and significantly reduces the amount of refrigerant required in the heat exchanger. When the refrigerant passes through the heat exchanger, liquid refrigerant flows in or out through the liquid manifold of the plate fin, while gaseous refrigerant flows in or out through the gas manifold of the plate fin. For example, when the air conditioner is in cooling mode, gaseous refrigerant flows in through the gas manifold of the outdoor heat exchanger's plate fin and condenses into liquid refrigerant within the outdoor heat exchanger. At this time, the liquid refrigerant flows out through the liquid manifold of the outdoor heat exchanger's plate fin. Simultaneously, in the indoor heat exchanger under the same operating condition, liquid refrigerant flows in through the liquid manifold of the indoor heat exchanger's plate fin, while gaseous refrigerant formed by evaporation in the indoor heat exchanger flows out through the gas manifold of the indoor heat exchanger's plate fin.

[0063] Because traditional finned tube heat exchangers have an inner diameter of about 4 to 10 millimeters, plate-fin stacked heat exchangers have a significantly smaller internal volume compared to traditional finned tube heat exchangers. This results in their inability to quickly absorb changes in refrigerant volume, and they are particularly prone to high-pressure rises under overload conditions, especially when the outdoor air temperature is high. Figure 5 As shown in the Morrillon diagram of an air conditioner according to an embodiment of the present invention, point 1 represents the compressor inlet, point 2 represents the compressor outlet, point 3 represents the expansion valve inlet, and point 4 represents the heat exchanger inlet. The process from point 1 to point 2 represents the gas compression process of the compressor. As shown in the diagram, the temperature and pressure at point 1 are higher than at point 2. Therefore, this process compresses the gaseous refrigerant to achieve temperature and pressure increases, resulting in a high-temperature, high-pressure gaseous refrigerant. The process from point 2 to point 3 represents the condensation process of the high-temperature, high-pressure gaseous refrigerant. The process from point 3 to point 4 represents the decompression process, and the process from point 4 to point 1 represents the evaporation process. The reverse Carnot cycle releases heat to the outdoor air and removes heat from the indoor environment, achieving cooling operation. Conversely, absorbing heat from the outdoor air and releasing heat into the indoor environment achieves heating operation. In the Morrillon diagram, the vertical axis represents pressure. As shown in the diagram, the vertical axis coordinate remains essentially unchanged during the condensation processes at points 2 and 3, therefore, the pressure remains essentially constant during the condensation process. Furthermore, the two-phase region within the Benmoral diagram is the area where liquid and gas coexist during the process of refrigerant condensing from gas to liquid, at which point the temperature remains constant.

[0064] When an air conditioner is in cooling mode, commercial air conditioners, such as those used in office buildings, typically have pressure sensors to monitor the refrigerant pressure in real time. This allows for pressure control based on a pre-set target high pressure. For example, using a pre-set target high pressure as a control threshold, when the pressure value obtained by the pressure sensor exceeds the control threshold, the outdoor fan speed will increase, thereby reducing the high pressure. However, the application of pressure sensors is not suitable for residential air conditioners. Therefore, this embodiment controls the outdoor fan speed by monitoring the condensing temperature. Figure 6 As shown, in the control of condensing temperature target, the responsiveness of refrigerant temperature is worse than that of refrigerant pressure. Therefore, even if the condensing temperature at the same pressure is set as the control threshold from the perspective of refrigerant properties, the time required for temperature detection is longer than that for pressure detection. This results in an overshoot phenomenon, causing a large difference from the target condensing temperature. Temperature changes cannot keep up with pressure changes, and when high pressure rises, the outdoor fan controlled by temperature changes cannot keep up with the rate of pressure increase. This overshoot tendency is particularly pronounced in heat exchangers with smaller internal volumes (such as plate-fin heat exchangers). Furthermore, when controlling the outdoor fan solely based on the condensing temperature change of the heat exchanger, there is a time term in the correlation between the outdoor fan airflow and the condensing temperature. Precise control of the condensing temperature target can easily lead to unstable phenomena such as vibration. To solve these problems, this invention proposes a control method for the outdoor fan in an air conditioner, which can improve the responsiveness and stability of the outdoor fan even using only a temperature sensor.

[0065] like Figure 1 As shown, the control method for the outdoor fan in an air conditioner according to an embodiment of the present invention includes:

[0066] S1, obtain the temperature of the outdoor heat exchanger.

[0067] S2 determines the temperature change over different time intervals based on the temperature of the outdoor heat exchanger. The time interval can be set according to actual conditions.

[0068] S3 generates fan speed control parameters based on temperature changes at different time intervals to provide transient response control for the outdoor fan. The fan speed control parameters corresponding to temperature changes are pre-stored and presented in a data table.

[0069] Specifically, the temperature of the outdoor heat exchanger can be collected in real time by a temperature sensor 1 installed on the outdoor heat exchanger. Then, according to a preset time interval, the temperature change value ΔT within the corresponding time interval is determined to judge the temperature change. Then, the fan speed control parameter corresponding to the temperature change value ΔT is found from a pre-stored data table, and the outdoor fan is controlled by the fan speed control parameter.

[0070] like Figure 7 As shown, in this embodiment, time points T1′, T2′, T3′, and T4′ are used as sampling time points, forming a time interval ΔT′i. The fan speed is controlled by judging the temperature change ΔT corresponding to this time interval ΔT′i. That is, when ΔT exceeds a pre-defined critical value, the outdoor fan is controlled. This allows the condensing temperature, which is significantly deviated from the target value due to overshoot, to be controlled near the target value. Furthermore, in this control process, at least two control times are set to determine fan control changes, corresponding to both rapidly changing and slowly changing control conditions. This ensures stability during normal control while simultaneously enabling fan control to respond to transitional changes.

[0071] In cooling mode, the purpose of the outdoor fan is to promote heat dissipation from the outdoor heat exchanger. Therefore, the fan speed is controlled based on the condensation temperature collected by the outdoor heat exchanger. The temperature change value ΔT mentioned above corresponds to the data table of fan speed control parameters shown in Table 1. Table 1 is as follows:

[0072] Table 1

[0073]

[0074] As shown in Table 1, the outdoor fan speed and airflow are positively correlated. Therefore, adjusting the fan speed can increase or decrease the airflow entering the heat exchanger. The fan speed control is set up with multiple control steps based on the temperature change range (e.g., fan step 1, fan step 2, fan step 3, etc.), and the corresponding outdoor fan speeds are different for each control step. For example, when the air conditioner is in cooling mode, the faster the temperature of the outdoor heat exchanger rises (i.e., the larger the temperature change), the more insufficient the current outdoor fan speed is to meet the heat dissipation demand. The fan speed needs to be increased to increase the outdoor airflow, enhance air circulation, and ensure effective heat dissipation. The fan steps in Table 1 are set based on the increasing trend of temperature change, meaning the fan speed increases incrementally with temperature. For example, the outdoor fan speed in step 1 is 50 rpm, in step 2 it's 80 rpm, and in step 3 it's 110 rpm. In this embodiment, the outdoor fan speed increases by 30 rpm with each fan step. In practical applications, the corresponding fan step can be found based on the collected temperature change value, and then the corresponding outdoor fan speed can be used for real-time control of the outdoor fan. Furthermore, the number of fan steps and the outdoor fan speed can be set according to the actual application.

[0075] The following is a detailed explanation of the process of transient response control of the outdoor fan in response to temperature changes in the outdoor heat exchanger under cooling mode.

[0076] According to one embodiment of the present invention, when the air conditioner is running in cooling mode, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. This includes: determining a temperature change value over a first time interval when the temperature of the outdoor heat exchanger is lower than a preset protection temperature; determining a temperature change value over a second time interval when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, wherein the second time interval is greater than the first time interval; and controlling the outdoor fan to maintain its current speed when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range.

[0077] The preset protection temperature, first time interval, first preset temperature difference range, target condensation temperature, second preset temperature difference range, second time interval, third preset temperature difference range, and fourth preset temperature difference range can be preset and stored according to actual conditions. For example, the preset protection temperature can be the start temperature of the protection control, the first time interval can be 30s, the first preset temperature difference range can be [-5,5], the second preset temperature range can be [-7.5,7.5], the second time interval can be 180s, the third preset temperature difference range can be [-2.5,2.5], and the fourth preset temperature difference range can be [-4.0,4.0].

[0078] Specifically, when the air conditioner is operating in cooling mode, it first collects the temperature of the outdoor heat exchanger through a temperature sensor to obtain the current temperature value t1 of the outdoor heat exchanger. If the current temperature value t1 is less than the preset protection temperature T... max After running continuously for 30 seconds, the current temperature value t2 of the outdoor heat exchanger is collected. At this time, the temperature change value ΔT before and after the first time interval is t2-t1. Then, ΔT is compared with the preset first temperature range a. If ΔT is within temperature range a and t2 is close to the target condensing temperature T, the temperature range is determined. set When the difference between the two values ​​is within the second preset temperature range b, continue working for 180 seconds and obtain the outdoor heat exchanger temperature value t3 after the second time interval. At this time, the temperature change value before and after 180 seconds is ΔT = t3 - t2. Then, compare ΔT with the third preset temperature range c. If ΔT is within the temperature range c and the outdoor heat exchanger temperature t3 is close to the target condensing temperature T, the temperature change is determined. set When the difference between the two values ​​is within the fourth preset temperature range d, the outdoor fan operates according to the original working steps, that is, the speed remains unchanged.

[0079] In addition, it is assumed that the above-mentioned first preset temperature difference range, second preset temperature difference range, third preset temperature difference range and fourth preset temperature difference range can be divided by setting a threshold value that increases in a regular manner. The threshold value of the first preset temperature difference range is ±ΔT1, the threshold value of the second preset temperature difference range is ±ΔT2, the threshold value of the third preset temperature difference range is ±ΔT3, and the threshold value of the fourth preset temperature difference range is ±ΔT4.

[0080] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over a first time interval is greater than or equal to the upper limit of a first preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of a second preset temperature difference interval, increasing the outdoor fan speed by a first preset step size; and when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference interval, decreasing the outdoor fan speed by a first preset step size. The absolute values ​​of the upper and lower limits of the first preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference interval are also equal. The first preset step size can be set according to the actual application; for example, the first preset step size can be 2.

[0081] Specifically, taking the temperature values ​​described in the above embodiments as an example, t1 and t2 are the temperatures of the outdoor heat exchanger obtained before and after 30 seconds (the first time interval). If the ΔT (t2-t1) obtained in the first time interval of 30 seconds is greater than or equal to ΔT1 (the maximum value of the first preset temperature difference range), or if the temperature t2 of the outdoor heat exchanger is greater than or equal to T... set When the difference between the target condensing temperature and the target condensing temperature is greater than or equal to ΔT2 (the maximum value of the second preset temperature difference range), it indicates that the current fan speed cannot meet the current heat dissipation demand. A first preset step size (e.g., 2) is set to increase the outdoor fan speed to improve the heat dissipation effect. Conversely, when ΔT is less than or equal to -ΔT1 (the minimum value of the first preset temperature difference range), or when the outdoor heat exchanger temperature t2 differs from T... set If the difference between the target condensation temperature and the target condensation temperature is less than or equal to -ΔT2 (the minimum value of the second preset temperature difference range), it indicates that the current heat dissipation is too fast, and the outdoor fan speed is reduced by the first preset step size (e.g., 2).

[0082] During operation, the current fan step can be determined based on the outdoor fan's rotational speed, and the first preset step size can be set as the difference between fan steps. For example, based on the establishment of Table 1 above, if the first preset step size is set to 2, and the current outdoor fan step is step 3, and based on the temperature determination, it is necessary to increase the heat dissipation effect of the outdoor heat exchanger by increasing the first preset step size, then fan step 3+2 is added to obtain the target fan step 5. At this time, the outdoor fan is controlled using the outdoor fan speed of 80 rpm in fan step 5. Conversely, if based on the temperature determination, it is necessary to decrease the heat dissipation effect of the outdoor heat exchanger by decreasing the first preset step size, then fan step 3-2 is subtracted to obtain the target fan step 1. At this time, the outdoor fan is controlled using the outdoor fan speed of 50 rpm in fan step 1.

[0083] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over a second time interval is greater than or equal to the upper limit of a third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of a fourth preset temperature difference interval, increasing the outdoor fan speed by a second preset step size; and when the temperature change value over a second time interval is less than or equal to the lower limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference interval, decreasing the outdoor fan speed by a second preset step size. The absolute values ​​of the upper and lower limits of the third preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference interval are also equal. The second preset step size can be set according to the actual application. A second preset step size less than a first preset step size indicates that the difference in outdoor fan speed control generated by the second preset step size is less than the first preset step size.

[0084] Specifically, taking the temperature values ​​described in the above embodiments as an example, t2 and t3 are the temperatures of the outdoor heat exchanger obtained before and after 180s (the second time interval), respectively. If the ΔT (t3-t2) obtained in the second time interval of 180s is greater than or equal to ΔT3 (the maximum value of the third preset temperature difference range), or if the outdoor heat exchanger's t3 and T... set When the difference between the target condensing temperature and the target condensing temperature is greater than or equal to ΔT4 (the maximum value of the fourth preset temperature difference range), it indicates that the current fan speed cannot meet the current heat dissipation demand. A second preset step size (e.g., 1) is set to increase the outdoor fan speed and improve the heat dissipation effect. Conversely, when ΔT is less than or equal to -ΔT3 (the minimum value of the third preset temperature difference range), or when the outdoor heat exchanger temperature t3 differs from T... setIf the difference between the target condensation temperature and the target condensation temperature is less than or equal to -ΔT4 (the minimum value of the fourth preset temperature difference range), it indicates that the current heat dissipation is too fast, and the outdoor fan speed is reduced by the second preset step size (e.g., 1).

[0085] Similarly, the explanations of the second preset step size and the first preset step size are as described in the above embodiments, and will not be repeated here.

[0086] In addition, ΔT1, ΔT2, ΔT3, and ΔT4 can be set according to Table 2 below.

[0087] Table 2

[0088] Temperature range ΔT1 ΔT2 ΔT3 ΔT4 just 5.0 2.5 7.5 4.0 burden -5.0 -2.5 -7.5 -4.0

[0089] A positive ΔT indicates an increasing temperature state, while a negative ΔT indicates a decreasing temperature state.

[0090] According to one embodiment of the present invention, when the temperature of the outdoor heat exchanger is greater than or equal to a preset protection temperature, the outdoor fan is controlled to operate at a preset maximum speed.

[0091] In other words, when the current temperature t1 of the outdoor heat exchanger is greater than or equal to T max At this time, the fan runs at its maximum speed to ensure maximum heat dissipation.

[0092] When the air conditioner is in heating mode, the high-temperature, high-pressure gaseous refrigerant undergoes heat exchange in the indoor heat exchanger, causing its temperature to drop. After passing through the outdoor heat exchanger, it absorbs heat from the ambient environment, vaporizing and returning to the compressor. When the outdoor heat exchanger temperature is low, frost will form on its surface, significantly reducing its heating capacity. Therefore, the heat exchanger temperature should ideally be at least 3°C ​​above the operating temperature. Furthermore, while the outdoor fan can theoretically operate at its maximum speed when the outdoor temperature is low, it's best to control the fan speed by monitoring the evaporation temperature when the outdoor air temperature is high, such as above 10°C. The same approach used in cooling mode can be applied to controlling the outdoor fan in heating mode. In cooling mode, the condensing temperature is used to control the fan speed at its maximum; in heating mode, the outdoor air temperature is used to determine whether to control the fan speed at its maximum.

[0093] The following is a detailed explanation of the process of transient response control of the outdoor fan in response to temperature changes in the outdoor heat exchanger under heating mode.

[0094] According to one embodiment of the present invention, when the air conditioner is running in heating mode, the outdoor ambient temperature is also acquired, and when the outdoor ambient temperature is greater than or equal to a preset upper limit outdoor ambient temperature, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan, including: determining the temperature change value over a first time interval; when the temperature change value over the first time interval is within a first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a second preset temperature difference range, determining the temperature change value over a second time interval, wherein the second time interval is greater than the first time interval; when the temperature change value over the second time interval is within a third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within a fourth preset temperature difference range, controlling the outdoor fan to maintain its current speed unchanged. The preset upper limit outdoor ambient temperature, first time interval, first preset temperature difference range, target condensation temperature, second preset temperature difference range, second time interval, third preset temperature difference range, and fourth preset temperature difference range can be preset and stored according to actual conditions. For example, the first time interval can be 30s, the first preset temperature difference range can be [-5,5], the second preset temperature range can be [-7.5,7.5], the second time interval can be 180s, the third preset temperature difference range can be [-2.5,2.5], and the fourth preset temperature difference range can be [-4.0,4.0].

[0095] Specifically, when the controller is operating in heating mode, it needs to acquire the outdoor ambient temperature via another temperature sensor to obtain the outdoor ambient temperature t1' and collect the current outdoor heat exchanger temperature t2'. If the current outdoor ambient temperature value t1' is less than the upper limit outdoor ambient temperature T... max After running continuously for 30 seconds, the temperature value t3' of the outdoor heat exchanger is collected. At this time, the temperature change value ΔT' before and after the first time interval is t3' - t2'. ΔT' is compared with the preset first temperature range a. If ΔT' is within range a and the temperature t3' of the outdoor heat exchanger is close to the target condensing temperature T... set When the difference between the two values ​​is within the second preset temperature range b, continue working for 180 seconds and obtain the outdoor heat exchanger temperature t4' after the second time interval. At this time, the temperature change value ΔT' within 180 seconds is t4'-t3'. Then, compare ΔT' with the third preset temperature range c. If ΔT' is within temperature range c and the outdoor heat exchanger temperature t4' is close to the target condensing temperature T... set When the difference between the two values ​​is within the fourth preset temperature range d, the outdoor fan operates according to the original working steps, that is, the speed remains unchanged.

[0096] In addition, it is assumed that the above-mentioned first preset temperature difference range, second preset temperature difference range, third preset temperature difference range and fourth preset temperature difference range can be divided by setting a threshold value that increases in a regular manner. The threshold value of the first preset temperature difference range is ±ΔT1, the threshold value of the second preset temperature difference range is ±ΔT2, the threshold value of the third preset temperature difference range is ±ΔT3, and the threshold value of the fourth preset temperature difference range is ±ΔT4.

[0097] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over a first time interval is greater than or equal to the upper limit of a first preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of a second preset temperature difference interval, decreasing the outdoor fan speed by a first preset step size; and when the temperature change value over the first time interval is less than or equal to the lower limit of the first preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference interval, increasing the outdoor fan speed by a first preset step size. The absolute values ​​of the upper and lower limits of the first preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the second preset temperature difference interval are also equal. The first preset step size can be set according to the actual application; for example, the first preset step size can be 2.

[0098] Specifically, taking the temperature values ​​described in the above embodiments as an example, t2' and t3' are the outdoor heat exchanger temperatures obtained before and after 30s (the first time interval), respectively. If the outdoor heat exchanger temperature change value ΔT' (t3'-t2') obtained in the first time interval 30s is greater than or equal to ΔT1 (the maximum value of the first preset temperature difference range), or if the outdoor heat exchanger temperature t3' is greater than or equal to T... set When the difference between the target condensing temperature and the target condensing temperature is greater than or equal to ΔT2 (the maximum value of the second preset temperature difference range), it indicates that the current fan speed cannot meet the current heat dissipation demand. A first preset step size (e.g., 2) is set to increase the outdoor fan speed and improve the heat dissipation effect. Conversely, when ΔT' is less than or equal to -ΔT1 (the minimum value of the first preset temperature difference range), or when the outdoor heat exchanger temperature t3' differs from T... set If the difference between the target condensation temperature and the target condensation temperature is less than or equal to -ΔT2 (the minimum value of the second preset temperature difference range), it indicates that the current heat dissipation is too fast, and the outdoor fan speed is reduced by the first preset step size (e.g., 2).

[0099] During operation, the current fan step of the outdoor fan can be determined based on its rotational speed. A first preset step size can be set as the difference between fan steps. For example, if the first preset step size is set to 2, and the current fan step is step 3, based on the temperature determination, it's necessary to increase the heat dissipation effect of the outdoor heat exchanger by increasing the first preset step size. Therefore, fan step 3 + 2 results in the target fan step 5, where the outdoor fan speed of step 5 (80 rpm) is used for control. Conversely, if the temperature determination indicates a need to decrease the heat dissipation effect of the outdoor heat exchanger, fan step 3 - 2 results in the target fan step 1, where the outdoor fan speed of step 1 (50 rpm) is used for control.

[0100] According to one embodiment of the present invention, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan. The method further includes: when the temperature change value over a second time interval is greater than or equal to the upper limit of a third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of a fourth preset temperature difference interval, decreasing the outdoor fan speed by a second preset step size; and when the temperature change value over a second time interval is less than or equal to the lower limit of the third preset temperature difference interval, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference interval, increasing the outdoor fan speed by a second preset step size. The absolute values ​​of the upper and lower limits of the third preset temperature difference interval are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference interval are also equal. The second preset step size can be set according to the actual application. A second preset step size less than a first preset step size indicates that the difference in outdoor fan speed control generated by the second preset step size is less than the first preset step size.

[0101] Specifically, taking the temperature values ​​described in the above embodiments as an example, t3' and t4' are the outdoor heat exchanger temperatures obtained before and after 180s (the second time interval), respectively. If the ΔT' obtained in the second time interval of 180s (which is t4'-t3') is greater than or equal to ΔT3 (the maximum value of the third preset temperature difference range), or if the outdoor heat exchanger temperature t4' is greater than or equal to T... set If the difference between the target condensing temperature and the target condensing temperature is greater than or equal to ΔT4 (the maximum value of the fourth preset temperature difference range), it indicates that the current heat dissipation is too fast. The second preset step size (e.g., 1) is set to reduce the outdoor fan speed and weaken the heat dissipation effect. Conversely, if ΔT' is less than or equal to -ΔT3 (the minimum value of the third preset temperature difference range), or if the outdoor heat exchanger temperature t4' differs from T... setWhen the difference between the target condensing temperature and the target condensing temperature is less than or equal to -ΔT4 (the minimum value of the fourth preset temperature difference range), the outdoor fan speed is increased by a second preset step size (e.g., 1) to improve the heat dissipation effect. The second preset step size can be implemented according to the application method of the first preset step size in the above-mentioned cooling mode, which will not be elaborated here.

[0102] In addition, in heating mode, the above ΔT1, ΔT2, ΔT3, and ΔT4 can also be specifically set according to Table 2. When the obtained ΔT is positive, it indicates that the temperature is increasing within the corresponding time interval, while a negative value indicates that the temperature is decreasing.

[0103] According to one embodiment of the present invention, when the outdoor ambient temperature is lower than a preset upper limit outdoor ambient temperature, the outdoor fan is controlled to operate at a preset maximum speed.

[0104] In other words, when the obtained outdoor current temperature t1' is less than T max At this time, the fan runs at its maximum speed to ensure maximum heat dissipation.

[0105] When the air conditioner is in cooling mode, the goal is to control the condensing temperature of the outdoor heat exchanger, i.e., the high-pressure temperature. When in heating mode, the goal is to control the evaporating temperature of the outdoor heat exchanger, i.e., the low-pressure temperature. Typically, within the compressor's operating range, in addition to high and low pressure, there is also a specified compression ratio. The compression ratio is usually defined as the ratio of high absolute pressure to low absolute pressure, and operation within a pressure ratio range of 2 to 8 is generally recommended. Therefore, to ensure the effective heat dissipation regulation of the outdoor heat exchanger by the outdoor fan, pressure ratio control is also necessary.

[0106] In the process of controlling the compressor's operating frequency through pressure ratio, if the low-pressure level drops in heating mode, it will lead to a high pressure ratio. In this case, the compressor's protective control will reduce the compressor's operating frequency, thus decreasing its capacity and compromising comfort. On the other hand, in cooling mode, the low-pressure level rises, causing the pressure ratio to drop, which may deviate from the compressor's operating range. Therefore, tightening the indoor expansion valve or similar measures will reduce the compressor's circulation volume, also compromising comfort.

[0107] To address the aforementioned problems, the control method proposed in the embodiments of the present invention will be described in detail below.

[0108] According to an embodiment of the present invention, the above-described method for controlling the outdoor fan in an air conditioner further includes: acquiring the temperature of the indoor heat exchanger; determining a pressure ratio based on the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger; and controlling the rotational speed of the outdoor fan based on the pressure ratio at different time intervals when the pressure ratio is less than or equal to a first preset ratio.

[0109] The first preset ratio can be preset according to the actual situation, and the correspondence between the temperature of the outdoor heat exchanger and the temperature and pressure ratio of the indoor heat exchanger can be stored in advance, as shown in Table 3.

[0110] Table 3

[0111]

[0112]

[0113] Specifically, temperature sensors 1 and 2, installed on the outdoor and indoor heat exchangers respectively, acquire the temperatures of the outdoor and indoor heat exchangers. Then, by retrieving pre-stored data, the corresponding pressure values ​​are obtained based on the acquired outdoor and indoor heat exchanger temperatures, resulting in a pressure ratio ε. When the pressure ratio is determined to be less than a first preset value, the air conditioner continues to operate for a certain time interval t, further acquiring the outdoor and indoor heat exchanger temperatures and obtaining the corresponding pressure ratio ε′. The difference between ε′ and ε is used to obtain the pressure ratio difference Δε for that time interval t, thus obtaining the pressure ratio change relationship and adjusting the speed of the outdoor fan.

[0114] In the pressure ratio calculation process described above, the high-pressure value is obtained by converting the temperature of the heat exchanger undergoing condensation transformation using a temperature sensor, while the low-pressure value is obtained by converting the temperature of the heat exchanger undergoing evaporation transformation using a temperature sensor. This yields a pressure ratio suitable for both cooling and heating modes. A preset pressure ratio range can be set according to the pressure ratio requirements of different modes. When the pressure ratio exceeds the preset range, the outdoor fan speed is adjusted.

[0115] According to one embodiment of the present invention, controlling the rotational speed of an outdoor fan based on pressure ratios at different time intervals includes: increasing the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a second preset ratio and less than or equal to a first preset ratio; decreasing the rotational speed of the outdoor fan by a first preset step size when the pressure ratio of the first time interval is greater than a third preset ratio, wherein the third preset ratio is less than the second preset ratio; and determining the pressure ratio of the second time interval when the pressure ratio of the first time interval is less than or equal to the third preset ratio, and controlling the rotational speed of the outdoor fan based on the pressure ratio of the second time interval.

[0116] The first preset time interval, the second preset time interval, the first preset ratio, the second preset ratio, the third preset ratio, and the first preset step size can be set according to the actual situation. For example, the first time interval can be 30s, the second time interval can be 180s, the first preset ratio can be 8.0, the second preset ratio can be 6.5, the third preset ratio can be 1.8, and the first preset step size can be 2.

[0117] Specifically, when the pressure ratio ε' after a 30-second time interval is greater than ε2 (the second preset ratio) and less than ε1 (the first preset ratio), it indicates that the current heat dissipation effect is poor. The outdoor fan speed is increased by a preset first step size (e.g., 2) to enhance the heat dissipation effect. When the pressure ratio ε' after a 30-second time interval is greater than ε3 (the third preset ratio) and less than or equal to ε2, it indicates excessive heat dissipation and an excessively low temperature. The fan speed is slowed down using the first preset step size (e.g., 2). When the pressure ratio ε after a 30-second time interval is less than or equal to ε3 (the third preset ratio), the operation continues for 180 seconds, and the fan speed is controlled based on the pressure ratio determined after 180 seconds.

[0118] According to one embodiment of the present invention, controlling the rotational speed of an outdoor fan based on a pressure ratio over a second time interval includes: when the pressure ratio over the second time interval is greater than a fourth preset ratio and less than or equal to a second preset ratio, increasing the rotational speed of the outdoor fan by a second preset step, wherein the second preset step is less than a first preset step and the fourth preset ratio is greater than a third preset ratio; and when the pressure ratio over the second time interval is greater than or equal to a third preset ratio and less than a fifth preset ratio, decreasing the rotational speed of the outdoor fan by a second preset step.

[0119] The fifth preset ratio is less than the fourth preset ratio. When the pressure ratio in the second time interval is greater than or equal to the fifth preset ratio and less than or equal to the fourth preset ratio, the outdoor fan is controlled to maintain its current speed. The fourth preset ratio, the fifth preset ratio, and the second preset step size can be set according to actual conditions. The fourth preset pressure ratio can be 5.0, the fifth preset pressure ratio can be 2.0, and the second preset step size can be 1.

[0120] Specifically, when the pressure ratio ε" of the aforementioned 180s (second time interval) is obtained, it is compared with ε2 (second preset ratio) and ε4 (fourth preset ratio). If ε is greater than ε4 and less than or equal to ε2, the fan speed is increased by a second preset step size (e.g., 1) to improve the heat dissipation effect. If ε is greater than or equal to ε3 (third preset ratio) and less than or equal to ε5 (fifth preset ratio), the fan speed is decreased by a second preset step size (e.g., 1) to reduce the heat dissipation effect. If ε is greater than or equal to ε5, the fan continues to operate at its current speed.

[0121] According to one embodiment of the present invention, when the pressure ratio is greater than a first preset ratio, the outdoor fan is controlled to operate at a preset maximum speed.

[0122] In other words, when the current pressure ratio ε is greater than ε1, the outdoor fan maintains its maximum speed to achieve the maximum heat dissipation effect.

[0123] As a specific example of the method for controlling the outdoor fan in a cooling mode of the present invention, Table 4 is shown:

[0124] Table 4

[0125]

[0126] like Figure 8 As shown, the control method for the outdoor fan in cooling mode includes the following steps:

[0127] S101, the air conditioner has started its cooling operation mode.

[0128] S102, Determine whether the outdoor heat exchanger temperature T is greater than or equal to T max If yes, proceed to step S103; otherwise, proceed to step S104.

[0129] S103, Fan = upper limit of fan steps Fmax, return to execute step S102.

[0130] S104. Determine whether the running time t is greater than or equal to the first preset time interval 30s. If yes, proceed to step S105. If no, return to step S102.

[0131] S105, determine whether the temperature change value ΔT after 30 seconds of operation satisfies ΔT greater than or equal to 0 and ΔT greater than or equal to ΔT1, or whether the outdoor heat exchanger temperature T after 30 seconds of operation is greater than or equal to the target condensing temperature T. set The sum of ΔT3 and ΔT3; if yes, proceed to step S106; otherwise, proceed to step S108.

[0132] S106, Fan, number of fan steps = current value + 2.

[0133] S107, timer reset, save current temperature value, return to step S102.

[0134] S108, determine whether ΔT≧0 and ΔT≧ΔT1 or T≧T is satisfied. set +ΔT3. If yes, proceed to step S109; otherwise, proceed to step S110.

[0135] S109, Fan = current value - 2, execute step S107.

[0136] S110, timer reset, save the current temperature value.

[0137] S111, determine whether the 180s (second preset time interval) requirement is met. If yes, proceed to step S112; otherwise, return to step S102.

[0138] S112, determine whether the outdoor heat exchanger temperature difference ΔT after 180s of operation satisfies: ΔT≧0 and ΔT≧ΔT² or T≧T set If +ΔT4 is true, proceed to step S113; otherwise, proceed to step S114.

[0139] S113, Fan = current value + 1, execute step S107.

[0140] S114, determine whether the outdoor heat exchanger temperature difference ΔT after 180s of operation satisfies: ΔT<0 and ΔT≤ΔT2 or T≤T set If +ΔT4 is true, proceed to step S115; otherwise, proceed to step S116.

[0141] S115, Fan = current value - 1, execute step S107.

[0142] S116, Fan = current value, proceed to step S107.

[0143] As a specific example of the control method for the outdoor fan in a heating mode of the present invention, Table 5 below shows:

[0144] Table 5

[0145]

[0146]

[0147] Figure 9 As shown, the control method for the outdoor fan in this heating mode includes the following steps:

[0148] S201, the air conditioner has started heating mode.

[0149] S202, Determine whether the outside air temperature Ta is greater than or equal to the preset upper limit of the outdoor ambient temperature T. a set If yes, proceed to step S203; otherwise, proceed to step S204.

[0150] S203, Fan = upper limit of fan steps Fmax, return to execute step S202.

[0151] S204. Determine whether the running time t is greater than or equal to the first preset time interval 30s. If yes, proceed to step S205. If no, return to step S202.

[0152] S205, determine whether the heat exchanger temperature change value ΔT after 30 seconds of operation satisfies: ΔT≧0 and ΔT≧ΔT1 or T≧T set +ΔT3; If yes, proceed to step S206; otherwise, proceed to step S208.

[0153] S206, Fan, number of fan steps = current value - 2.

[0154] S207, the timer is reset, the current temperature value is saved, and the process returns to step S202.

[0155] S208, determine whether the following conditions are met: ΔT < 0 and ΔT ≤ ΔT1 or T ≤ T set If +ΔT3 is true, proceed to step S209; otherwise, proceed to step S210.

[0156] S209, Fan = current value + 2, execute step S207.

[0157] S210, timer reset, save the current temperature value.

[0158] S211, determine whether the 180s (second preset time interval) requirement is met. If yes, proceed to step S212; otherwise, return to step S202.

[0159] S212, determine whether the outdoor heat exchanger temperature difference ΔT after 180s of operation satisfies: ΔT≧0 and ΔT≧ΔT² or T≧T set If +ΔT4 is true, proceed to step S213; otherwise, proceed to step S214.

[0160] S213, Fan = current value - 1, execute step S207.

[0161] S214, determine whether the outdoor heat exchanger temperature difference ΔT after 180s of operation satisfies: ΔT < 0 and ΔT ≤ ΔT² or T ≤ T set If +ΔT4 is true, proceed to step S215; otherwise, proceed to step S216.

[0162] S215, Fan = current value + 1, execute step S207.

[0163] S216, Fan = current value, execute step S207.

[0164] As a specific example of the control method for outdoor fans using pressure comparison according to the present invention, Table 6 is shown below:

[0165] Table 6

[0166] Priority Control conditions Adding or subtracting steps for blower Control cycle 1 ε > 8.0 Upper limit steps Always 2 6.5 < ε ≤ 8.0 +2 steps 30 seconds 3 1.8 < ε -2 steps 30 seconds 4 5.0 < ε ≤ 6.5 +1 step 180 seconds 5 1.8≤ε2.0 -1 Step 180 seconds 6 2.0≤ε≤5.0 No change -

[0167] At this time, pressure comparison is used for outdoor fans, such as Figure 10 The control method shown specifically includes the following steps:

[0168] S301, the air conditioner has started heating / cooling operation mode.

[0169] S302, determine whether the current pressure ratio ε is greater than 8.0. If yes, proceed to step S303; otherwise, proceed to step S304.

[0170] S303, Fan = upper limit of fan steps Fmax, return to execute step S302.

[0171] S304. Determine whether the running time t is greater than or equal to the first preset time interval 30s. If yes, proceed to step S305. If no, return to step S302.

[0172] S305, determine whether the pressure ratio ε after running for 30 seconds satisfies: 6.5<ε≤8.0. If yes, proceed to step S306; otherwise, proceed to step S308.

[0173] S306, Fan number of fan steps = current value + 2.

[0174] S307, timer reset, save current value, return to execution step S102.

[0175] S308, determine whether the pressure ratio ε satisfies: 1.8 < ε. If yes, proceed to step S309; ​​otherwise, proceed to step S310.

[0176] S309, Fan = current value - 2, execute step S107.

[0177] S310, timer reset, save the current value.

[0178] S311, determine whether the 180s (second preset time interval) requirement is met. If yes, proceed to step S312; otherwise, return to step S302.

[0179] S312, determine whether the pressure ratio ε after 180s of operation satisfies: 5.0<ε≤6.5. If yes, proceed to step S312; otherwise, proceed to step S313.

[0180] S313, Fan = current value + 1, execute step S307.

[0181] S314. Determine whether the pressure ratio ε after 180s of operation satisfies: 1.8≤ε<2.0. If yes, proceed to step S315; otherwise, proceed to step S316.

[0182] S315, Fan = current value - 1, execute step S307.

[0183] S316, Fan = current value, execute step S307.

[0184] In summary, the control method for the outdoor fan in an air conditioner according to an embodiment of the present invention first acquires the temperature of the outdoor heat exchanger, then determines the temperature changes over different time intervals based on the outdoor heat exchanger temperature, and finally generates fan speed control parameters based on the temperature changes over different time intervals to perform transient response control on the outdoor fan. Therefore, this method performs transient response control on the outdoor fan based on the outdoor heat exchanger temperature, improving the responsiveness and stability of the outdoor fan, and avoiding pressure fluctuations and excessive protective control caused by fan vibration, which could lead to reduced air conditioner capacity and comfort.

[0185] Corresponding to the above embodiments, the present invention also proposes a control device for an outdoor fan in an air conditioner.

[0186] like Figure 11 As shown, the control device for the outdoor fan in the air conditioner of this embodiment may include: a first temperature acquisition module 10 and a control module 20.

[0187] The first temperature acquisition module 10 is used to acquire the temperature of the outdoor heat exchanger and determine the temperature change at different time intervals based on the temperature of the outdoor heat exchanger. The control module 20 is used to generate fan speed control parameters based on the temperature change at different time intervals to perform transient response control on the outdoor fan.

[0188] Specifically, the first temperature acquisition module 10 can collect the temperature of the outdoor heat exchanger in real time through a temperature sensor installed on the outdoor heat exchanger. Then, according to a preset time interval, it determines the temperature change value ΔT within the corresponding time interval to judge the temperature change. Then, the control module 20 finds the fan speed control parameter corresponding to the temperature change value ΔT from a pre-stored data table, and uses the fan speed control parameter to control the outdoor fan.

[0189] For example, it is possible Figure 7 The time points T1′, T2′, T3′, and T4′ are used as sampling time points for the first temperature acquisition module. These sampling time points form a time interval ΔT′i. The fan speed is controlled by judging the temperature change ΔT corresponding to this time interval ΔT′i. Specifically, when ΔT exceeds a pre-defined critical value, the control module controls the outdoor fan. This allows the condensing temperature, which may deviate significantly from the target value due to overshoot, to be controlled near the target value. Furthermore, in this control process, at least two control times are set to determine fan control changes, corresponding to both rapidly changing and slowly changing control conditions. This ensures stability during normal control while simultaneously enabling fan control to handle transitional responses.

[0190] It should be noted that for details not disclosed in the control device of the outdoor fan in the air conditioner of the present invention, please refer to the details disclosed in the control method of the outdoor fan in the air conditioner of the above embodiments of the present invention, which will not be repeated here.

[0191] In summary, the outdoor fan control device in the air conditioner according to an embodiment of the present invention acquires the temperature of the outdoor heat exchanger through a first temperature acquisition module, determines the temperature change over different time intervals based on the outdoor heat exchanger temperature, and generates fan speed control parameters based on the temperature change over different time intervals to perform transient response control on the outdoor fan. Therefore, this device performs transient response control on the outdoor fan based on the outdoor heat exchanger temperature, improving the responsiveness and stability of the outdoor fan, and avoiding pressure fluctuations and excessive protective control caused by fan vibration, which could lead to reduced air conditioner capacity and comfort.

[0192] Corresponding to the above embodiments, the present invention also proposes an air conditioner.

[0193] like Figure 12 As shown, the air conditioner 100 of this embodiment includes a memory 110, a processor 120, and a control program for the outdoor fan of the air conditioner stored in the memory 110 and executable on the processor 120. When the processor 120 executes the control program for the outdoor fan of the air conditioner, it implements the above-mentioned control method for the outdoor fan of the air conditioner.

[0194] According to the air conditioner of the present invention, when the processor executes the control program of the outdoor fan in the air conditioner, the above-mentioned control method of the outdoor fan in the air conditioner is realized, which improves the responsiveness and stability of the outdoor fan and avoids the problems of reduced air conditioner capacity and reduced comfort caused by pressure fluctuations and excessive protection control due to fan vibration.

[0195] Corresponding to the above embodiments, the present invention also proposes a computer-readable storage medium.

[0196] The computer-readable storage medium of this invention stores a control program for an outdoor fan in an air conditioner. When the control program for the outdoor fan in an air conditioner is executed by a processor, it implements the above-described control method for the outdoor fan in an air conditioner.

[0197] According to an embodiment of the present invention, a computer-readable storage medium implements the above-described control method for an outdoor fan in an air conditioner by executing a control program for an outdoor fan in an air conditioner stored thereon via a processor. This improves the responsiveness and stability of the outdoor fan and avoids problems such as reduced air conditioner capacity and decreased comfort caused by pressure fluctuations and excessive protective control due to fan vibration.

[0198] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0199] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0200] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0201] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for controlling an outdoor fan in an air conditioner, characterized in that, include: Obtain the temperature of the outdoor heat exchanger; The temperature changes at different time intervals are determined based on the temperature of the outdoor heat exchanger. Fan speed control parameters are generated based on temperature changes at different time intervals to perform transient response control on the outdoor fan. When the air conditioner is running in cooling mode, fan speed control parameters are generated based on temperature changes at different time intervals to perform transient response control on the outdoor fan, including: When the temperature of the outdoor heat exchanger is lower than the preset protection temperature, the temperature change value of the first time interval is determined; When the temperature change value of the first time interval is within the first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within the second preset temperature difference range, the temperature change value of the second time interval is determined, wherein the second time interval is greater than the first time interval; When the temperature change value of the second time interval is within the third preset temperature difference range and the temperature difference between the outdoor heat exchanger and the target condensing temperature is within the fourth preset temperature difference range, the outdoor fan is controlled to maintain its current speed. When the temperature change value in the first time interval is greater than or equal to the upper limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range, the speed of the outdoor fan is increased by the first preset step size. When the temperature change value in the first time interval is less than or equal to the lower limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, the speed of the outdoor fan is reduced by a first preset step size, wherein the absolute value of the upper limit of the first preset temperature difference range is equal to the absolute value of the lower limit of the first preset temperature difference range, and the absolute value of the upper limit of the second preset temperature difference range is equal to the absolute value of the lower limit of the second preset temperature difference range. When the temperature change value in the second time interval is greater than or equal to the upper limit of the third preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference range, the speed of the outdoor fan is increased by a second preset step size, wherein the second preset step size is less than the first preset step size.

2. The method according to claim 1, characterized in that, Generating fan speed control parameters based on temperature changes at different time intervals to perform transient response control on the outdoor fan, and further including: When the temperature change value in the second time interval is less than or equal to the lower limit of the third preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference range, the speed of the outdoor fan is reduced by a second preset step size. The absolute values ​​of the upper and lower limits of the third preset temperature difference range are equal, and the absolute values ​​of the upper and lower limits of the fourth preset temperature difference range are equal.

3. The method according to any one of claims 2-2, characterized in that, When the temperature of the outdoor heat exchanger is greater than or equal to the preset protection temperature, the outdoor fan is controlled to run at the preset maximum speed.

4. The method according to claim 1, characterized in that, When the air conditioner is operating in heating mode, the outdoor ambient temperature is also acquired, and when the outdoor ambient temperature is greater than or equal to a preset upper limit outdoor ambient temperature, fan speed control parameters are generated based on temperature changes over different time intervals to perform transient response control on the outdoor fan, including: Determine the temperature change value for the first time interval; When the temperature change value of the first time interval is within the first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within the second preset temperature difference range, the temperature change value of the second time interval is determined, wherein the second time interval is greater than the first time interval; When the temperature change value of the second time interval is within the third preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within the fourth preset temperature difference range, the outdoor fan is controlled to maintain its current speed.

5. The method according to claim 4, characterized in that, Generating fan speed control parameters based on temperature changes at different time intervals to perform transient response control on the outdoor fan, and further including: When the temperature change value in the first time interval is greater than or equal to the upper limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range, the speed of the outdoor fan is reduced by the first preset step size. When the temperature change value in the first time interval is less than or equal to the lower limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, the rotational speed of the outdoor fan is increased by a first preset step size, wherein the absolute value of the upper limit of the first preset temperature difference range is equal to the absolute value of the lower limit of the first preset temperature difference range, and the absolute value of the upper limit of the second preset temperature difference range is equal to the absolute value of the lower limit of the second preset temperature difference range.

6. The method according to claim 5, characterized in that, Generating fan speed control parameters based on temperature changes at different time intervals to perform transient response control on the outdoor fan, and further including: When the temperature change value in the second time interval is greater than or equal to the upper limit of the third preset temperature difference range or the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference range, the speed of the outdoor fan is reduced by a second preset step size, wherein the second preset step size is less than the first preset step size. When the temperature change value in the second time interval is less than or equal to the lower limit of the third preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the fourth preset temperature difference range, the speed of the outdoor fan is increased by a second preset step size, wherein the absolute value of the upper limit of the third preset temperature difference range is equal to the absolute value of the lower limit of the third preset temperature difference range, and the absolute value of the upper limit of the fourth preset temperature difference range is equal to the absolute value of the lower limit of the fourth preset temperature difference range.

7. The method according to any one of claims 4-6, characterized in that, When the outdoor ambient temperature is lower than the preset upper limit outdoor ambient temperature, the outdoor fan is controlled to operate at the preset maximum speed.

8. The method according to claim 1, characterized in that, Also includes: Obtain the temperature of the indoor heat exchanger; The pressure ratio is determined based on the temperature of the outdoor heat exchanger and the temperature of the indoor heat exchanger; When the pressure ratio is less than or equal to a first preset ratio, the rotational speed of the outdoor fan is controlled according to the pressure ratio at different time intervals.

9. The method according to claim 8, characterized in that, The rotational speed of the outdoor fan is controlled based on the pressure ratio at different time intervals, including: When the pressure ratio in the first time interval is greater than the second preset ratio and less than or equal to the first preset ratio, the rotational speed of the outdoor fan is increased by a first preset step size; When the pressure ratio in the first time interval is greater than the third preset ratio, the speed of the outdoor fan is reduced by a first preset step size, wherein the third preset ratio is less than the second preset ratio; When the pressure ratio of the first time interval is less than or equal to the third preset ratio, the pressure ratio of the second time interval is determined, and the speed of the outdoor fan is controlled according to the pressure ratio of the second time interval, wherein the second time interval is greater than the first time interval.

10. The method according to claim 9, characterized in that, Controlling the speed of the outdoor fan based on the pressure ratio of the second time interval includes: When the pressure ratio in the second time interval is greater than the fourth preset ratio and less than or equal to the second preset ratio, the rotational speed of the outdoor fan is increased by a second preset step size, wherein the second preset step size is less than the first preset step size, and the fourth preset ratio is greater than the third preset ratio. When the pressure ratio in the second time interval is greater than or equal to the third preset ratio and less than the fifth preset ratio, the speed of the outdoor fan is reduced by a second preset step size, wherein the fifth preset ratio is less than the fourth preset ratio. When the pressure ratio in the second time interval is greater than or equal to the fifth preset ratio and less than or equal to the fourth preset ratio, the outdoor fan is controlled to maintain its current rotation speed.

11. The method according to any one of claims 8-10, characterized in that, When the pressure ratio is greater than the first preset ratio, the outdoor fan is controlled to run at the preset maximum speed.

12. A control device for an outdoor fan in an air conditioner, characterized in that, include: The first temperature acquisition module is used to acquire the temperature of the outdoor heat exchanger and determine the temperature change at different time intervals based on the temperature of the outdoor heat exchanger. The control module is used to generate fan speed control parameters based on temperature changes at different time intervals, so as to perform transient response control on the outdoor fan. When the air conditioner is running in cooling mode, fan speed control parameters are generated based on temperature changes at different time intervals to perform transient response control on the outdoor fan, including: When the temperature of the outdoor heat exchanger is lower than the preset protection temperature, the temperature change value of the first time interval is determined; When the temperature change value of the first time interval is within the first preset temperature difference range and the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is within the second preset temperature difference range, the temperature change value of the second time interval is determined, wherein the second time interval is greater than the first time interval; When the temperature change value of the second time interval is within the third preset temperature difference range and the temperature difference between the outdoor heat exchanger and the target condensing temperature is within the fourth preset temperature difference range, the outdoor fan is controlled to maintain its current speed. When the temperature change value in the first time interval is greater than or equal to the upper limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the second preset temperature difference range, the speed of the outdoor fan is increased by the first preset step size. When the temperature change value in the first time interval is less than or equal to the lower limit of the first preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is less than or equal to the lower limit of the second preset temperature difference range, the speed of the outdoor fan is reduced by a first preset step size, wherein the absolute value of the upper limit of the first preset temperature difference range is equal to the absolute value of the lower limit of the first preset temperature difference range, and the absolute value of the upper limit of the second preset temperature difference range is equal to the absolute value of the lower limit of the second preset temperature difference range. When the temperature change value in the second time interval is greater than or equal to the upper limit of the third preset temperature difference range, or when the difference between the temperature of the outdoor heat exchanger and the target condensing temperature is greater than or equal to the upper limit of the fourth preset temperature difference range, the speed of the outdoor fan is increased by a second preset step size, wherein the second preset step size is less than the first preset step size.

13. An air conditioner, characterized in that, The device includes a memory, a processor, and a control program for an outdoor fan in an air conditioner stored in the memory and executable on the processor. When the processor executes the control program for the outdoor fan in the air conditioner, it implements the control method for the outdoor fan in an air conditioner according to any one of claims 1-11.

14. A computer-readable storage medium, characterized in that, It stores a control program for the outdoor fan of the air conditioner, which, when executed by the processor, implements the control method for the outdoor fan of the air conditioner according to any one of claims 1-11.

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