Control method of air conditioner, air conditioner, and storage medium

Abstract

The application discloses a control method of an air conditioner, the air conditioner and a storage medium. The air conditioner comprises a shell, an indoor air duct is arranged in the shell, an indoor heat exchanger and a first fan are arranged in the indoor air duct, and a fresh air outlet is arranged on the shell and communicated with the indoor air duct. The method comprises the following steps: controlling the air conditioner to operate in a heating mode; when the air conditioner operating in the heating mode reaches a defrosting condition, controlling the first fan to operate in a first steering mode so that indoor air is discharged to an outdoor environment from the fresh air outlet after being exchanged with the indoor heat exchanger, and controlling the air conditioner to operate in a refrigeration mode. The application aims to reduce the fluctuation of indoor temperature during the defrosting process and improve the defrosting efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more particularly to a control method for an air conditioner, an air conditioner, and a storage medium. Background Technology

[0002] As air conditioners become more widely used, their application scenarios are also becoming more diverse. Currently, many air conditioners used in low-temperature environments require defrosting. During defrosting, air conditioners generally operate in cooling mode, with the outdoor heat exchanger in a condensing state, releasing heat to melt the frost on the outdoor unit.

[0003] Currently, during the defrosting process of an air conditioner, the fan in the indoor unit usually stops to prevent the cold energy evaporated by the indoor heat exchanger from lowering the indoor temperature and affecting user comfort. However, this prevents the indoor heat exchanger from exchanging heat, reducing the overall heat exchange output capacity of the system and resulting in low defrosting efficiency of the outdoor unit. Summary of the Invention

[0004] The main objective of this invention is to provide a control method for an air conditioner, an air conditioner, and a storage medium, which aims to reduce indoor temperature fluctuations during the defrosting process while improving defrosting efficiency.

[0005] To achieve the above objectives, the present invention provides a control method for an air conditioner. The air conditioner includes a housing, an indoor air duct is provided inside the housing, an indoor heat exchanger and a first fan are provided inside the indoor air duct, and a fresh air inlet communicating with the indoor air duct is provided on the housing. The control method for the air conditioner includes the following steps:

[0006] Control the air conditioner to operate in heating mode;

[0007] When the air conditioner reaches the defrosting condition during heating operation, the first fan is controlled to operate in the first direction so that the indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment, thereby controlling the air conditioner to operate in cooling mode.

[0008] Optionally, the housing is further provided with an indoor air outlet, and the first fan includes at least an indoor fan corresponding to the indoor air outlet and / or a fresh air fan corresponding to the fresh air inlet. The step of controlling the first fan to operate in a first direction so that the indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment includes:

[0009] Control the indoor fan and / or the fresh air fan to operate in the first direction so that the indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air outlet to the outdoor environment.

[0010] Optionally, the step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment includes:

[0011] Obtain the operating pressure of the air conditioner;

[0012] The target rotational speed of the first fan is determined based on the operating pressure.

[0013] The first fan is controlled to operate at the first direction according to the target speed, so that the exhaust pressure of the air conditioner compressor is greater than or equal to the preset pressure.

[0014] Optionally, the operating pressure includes the return gas pressure and / or discharge pressure of the air conditioner's compressor, and the step of determining the target speed of the first fan based on the operating pressure includes:

[0015] The target rotational speed is determined based on the return pressure and / or the exhaust pressure.

[0016] Optionally, the step of determining the target rotational speed based on the return gas pressure and / or the exhaust gas pressure includes:

[0017] Determine a first pressure difference value between the exhaust pressure and the preset pressure, and determine a second pressure difference value between the exhaust pressure and the return gas pressure;

[0018] The target rotational speed is determined based on the first differential pressure value and the second differential pressure value.

[0019] Optionally, the step of controlling the air conditioner's cooling operation includes:

[0020] Control the compressor of the air conditioner to reduce its frequency and / or control the second fan of the air conditioner located outdoors to reduce its speed;

[0021] Control the air conditioner to switch from heating mode to cooling mode;

[0022] Control the compressor to increase its frequency.

[0023] Optionally, the housing is further provided with an indoor air outlet, and the first fan includes an indoor fan corresponding to the indoor air outlet. Before the step of controlling the first fan to operate in a first direction so that the indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air outlet to the outdoor environment, and controlling the air conditioner to operate in cooling mode, the method further includes:

[0024] When the air conditioner reaches the defrosting condition during heating operation, the air conditioner is controlled to maintain heating operation, the indoor fan is controlled to reduce its speed for a preset time, and / or the air conditioner's compressor is controlled to increase its frequency for a preset time.

[0025] Optionally, the housing is further provided with an indoor air outlet, and the first fan includes an indoor fan corresponding to the indoor air outlet. After the step of controlling the first fan to run in a first direction and controlling the air conditioner to run in cooling mode when the air conditioner reaches the defrosting condition in heating mode, the method further includes:

[0026] Obtain the temperature of the outdoor heat exchanger;

[0027] When the temperature of the outdoor heat exchanger is greater than or equal to the preset temperature, the air conditioner is controlled to operate in heating mode and the indoor fan is controlled to operate in the second direction so that the indoor air exchanges heat with the indoor heat exchanger and is then blown into the room.

[0028] The preset temperature is the minimum temperature that the outdoor heat exchanger is allowed to reach after the air conditioner finishes defrosting.

[0029] Optionally, the first fan further includes a fresh air fan corresponding to the fresh air inlet. Before the step of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in a second direction so that the indoor air exchanges heat with the indoor heat exchanger and is then blown into the room, the method further includes:

[0030] When the outdoor heat exchanger temperature is greater than or equal to the preset temperature, the speed of the fresh air fan and the indoor fan are reduced, and the air conditioner is switched from cooling operation to heating operation.

[0031] Perform the steps of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in the second direction.

[0032] Furthermore, in order to achieve the above objectives, this application also proposes an air conditioner, the air conditioner comprising:

[0033] The housing has an indoor air duct inside and a fresh air inlet connected to the indoor air duct on the housing.

[0034] An indoor heat exchanger is disposed within the housing;

[0035] The first fan is installed in the indoor air duct;

[0036] A control device, wherein the first fan is connected to the control device, the control device comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any of the preceding claims.

[0037] In addition, to achieve the above objectives, this application also proposes a storage medium storing a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for the air conditioner as described in any of the preceding claims.

[0038] This invention proposes a control method for an air conditioner. Based on an air conditioner with an indoor heat exchanger, a first fan, and a fresh air inlet connected to the indoor air duct, this method controls the first fan in the indoor air duct to operate in a first direction and controls the air conditioner to operate in cooling mode when the air conditioner reaches the defrosting conditions during heating operation. Based on the outdoor heat exchanger releasing heat for defrosting during cooling operation, the first fan drives indoor air to exchange heat with the indoor heat exchanger and then discharges it outdoors through the fresh air inlet. This enhances heat exchange in the indoor heat exchanger during defrosting, increases the overall pressure level of the refrigerant system, thereby increasing the compressor's exhaust temperature and raising the refrigerant temperature entering the outdoor heat exchanger. Increased heat release from the outdoor heat exchanger accelerates defrosting. Furthermore, the cool air after heat exchange with the indoor heat exchanger is blown outdoors, not into the room, effectively preventing a significant drop in indoor temperature. This reduces indoor temperature fluctuations during defrosting while improving defrosting efficiency. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the structure of an embodiment of the air conditioner of the present invention located on the indoor side;

[0040] Figure 2 This is a schematic diagram of the hardware structure involved in the operation of an embodiment of the air conditioner of the present invention;

[0041] Figure 3 This is a flowchart illustrating an embodiment of the control method for an air conditioner according to the present invention;

[0042] Figure 4 This is a flowchart illustrating another embodiment of the control method for an air conditioner according to the present invention;

[0043] Figure 5 This is a flowchart illustrating another embodiment of the control method for the air conditioner of the present invention.

[0044] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0045] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0046] The main solution of this invention is as follows: the air conditioner includes a housing, an indoor air duct is provided inside the housing, an indoor heat exchanger and a first fan are provided inside the indoor air duct, and a fresh air inlet communicating with the indoor air duct is provided on the housing. The control method of the air conditioner includes the following steps: controlling the air conditioner to operate in heating mode; when the air conditioner reaches the defrosting condition in heating mode, controlling the first fan to operate in a first direction so that the indoor air exchanges heat with the indoor heat exchanger and is discharged from the fresh air inlet to the outdoor environment, and controlling the air conditioner to operate in cooling mode.

[0047] In existing technology, the fan in the indoor unit of an air conditioner usually stops during the defrosting process to prevent the cold energy evaporated by the indoor heat exchanger from lowering the indoor temperature and affecting user comfort. However, this prevents the indoor heat exchanger from exchanging heat, reducing the overall heat exchange output capacity of the system and resulting in low defrosting efficiency of the outdoor unit.

[0048] The present invention provides the above-mentioned solution, which aims to reduce indoor temperature fluctuations during the defrosting process while improving defrosting efficiency.

[0049] This invention provides an air conditioner. In this embodiment, the air conditioner is a split-type air conditioner. In other embodiments, the air conditioner may also be a single-unit air conditioner, such as a window air conditioner.

[0050] In this embodiment, refer to Figure 1 and Figure 2 The air conditioner includes a housing 1, within which an indoor air duct is installed. An indoor heat exchanger 2 and a first fan are housed within the indoor air duct. The housing 1 has a fresh air inlet 11, an indoor air outlet 12, and a return air inlet 13. The fresh air inlet 11 connects to the outdoor environment and the indoor air duct. Both the indoor air outlet 12 and the return air inlet 13 connect to the indoor environment and the indoor air duct. The first fan is connected to a control device, which can be used to control the operation of the first fan.

[0051] In this embodiment, the first fan includes at least an indoor fan 3 corresponding to the indoor air outlet 12 and / or a fresh air fan 4 corresponding to the fresh air inlet 11. In other embodiments, the first fan may also include the indoor fan 3 corresponding to the indoor air outlet 12 but not the fresh air fan 4 corresponding to the fresh air inlet 11.

[0052] Furthermore, the air conditioner includes a refrigerant circulation loop, which includes a compressor 5, a four-way valve, the aforementioned indoor heat exchanger 2, a throttling device 6, and an outdoor heat exchanger. The outdoor heat exchanger is correspondingly configured with a second fan 7 located outdoors. The compressor 5, the four-way valve 8, the throttling device, and the second fan 7 are all connected to a control device. Specifically, the four-way valve 8 has a first valve position and a second valve position. When the four-way valve 8 is in the first valve position, the air conditioner operates in cooling mode. The refrigerant discharged from the compressor 5 passes sequentially through the outdoor heat exchanger, the throttling device, and the indoor heat exchanger 2 before returning to the compressor 5. The indoor heat exchanger 2 is in an evaporating state, and the outdoor heat exchanger is in a condensing state. When the four-way valve 8 is in the second valve position, the air conditioner operates in heating mode. The refrigerant discharged from the compressor 5 passes sequentially through the indoor heat exchanger 2, the throttling device, and the outdoor heat exchanger before returning to the compressor 5. The indoor heat exchanger 2 is in a condensing state, and the outdoor heat exchanger is in an evaporating state.

[0053] Furthermore, refer to Figure 2 The outdoor heat exchanger is equipped with a temperature sensor 01, which is used to detect the temperature of the outdoor heat exchanger. The temperature sensor 01 is connected to a control device, which can acquire the data detected by the temperature sensor 01.

[0054] Furthermore, refer to Figure 2 The air conditioner may also include a pressure detection module 02, which is located at at least one position on the refrigerant circulation loop to detect the operating pressure of the air conditioner. The pressure detection module 02 is connected to the control device. The pressure detection module 02 may be located at the exhaust port and / or return port of the compressor 5, or at other locations, such as between the throttling device 6 and the indoor heat exchanger 2, or between the throttling device 6 and the outdoor heat exchanger.

[0055] In this embodiment of the invention, reference is made to Figure 2 The control unit of the air conditioner includes a processor 1001 (e.g., CPU), a memory 1002, a timer 1003, etc. The components in the control unit are connected via a communication bus. The memory 1002 can be a high-speed RAM or a stable, non-volatile memory, such as a disk drive. Optionally, the memory 1002 can also be a storage device independent of the aforementioned processor 1001.

[0056] Those skilled in the art will understand that Figure 2 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0057] like Figure 2 As shown, the memory 1002, which serves as a storage medium, may include a control program for an air conditioner. Figure 2In the device shown, the processor 1001 can be used to call the control program of the air conditioner stored in the memory 1002 and execute the relevant steps of the control method of the air conditioner in the following embodiments.

[0058] This invention also provides a control method for an air conditioner, applied to the aforementioned air conditioner.

[0059] Reference Figure 3 This application proposes an embodiment of a control method for an air conditioner. In this embodiment, the air conditioner includes a housing, an indoor air duct is provided inside the housing, an indoor heat exchanger and a first fan are provided inside the indoor air duct, and a fresh air inlet communicating with the indoor air duct is provided on the housing. The control method of the air conditioner includes:

[0060] Step S10: Control the air conditioner to operate in heating mode;

[0061] When the air conditioner is in heating mode, the indoor heat exchanger is in a condensing state and releases heat. Driven by the indoor fan, the indoor air exchanges heat with the indoor heat exchanger and absorbs the heat released by the indoor heat exchanger.

[0062] Step S20: When the air conditioner reaches the defrosting condition during heating operation, the first fan is controlled to operate in the first direction so that the indoor air exchanges heat with the indoor heat exchanger and is discharged from the fresh air inlet to the outdoor environment, and the air conditioner is controlled to operate in cooling mode.

[0063] Defrosting conditions specifically refer to the target conditions that the air conditioner's own state parameters and / or the environmental parameters of the environment in which the air conditioner is located need to be achieved during the air conditioner's heating operation. In this embodiment, the outdoor heat exchanger temperature is detected during the air conditioner's heating operation. When the detected outdoor heat exchanger temperature is lower than a preset temperature, it is determined that the air conditioner's heating operation has reached the defrosting condition, wherein the preset temperature is less than or equal to the freezing point temperature. In other embodiments, the defrosting condition can also be determined when a user-inputted defrosting command is detected during the air conditioner's heating operation.

[0064] When the air conditioner reaches the defrosting condition in heating mode, it can be controlled to immediately switch to cooling mode. After the air conditioner switches to cooling mode, the first fan is controlled to run in the first direction. When the air conditioner reaches the defrosting condition in heating mode, it can also be controlled to switch to cooling mode after a preset time interval. Within the preset time interval, the first fan is controlled to run in the first direction.

[0065] When the air conditioner is in cooling mode, the outdoor heat exchanger is in a condensing state and releases heat. The heat released by the outdoor heat exchanger melts the frost in the outdoor unit.

[0066] In this embodiment, the first fan includes at least an indoor fan and / or a fresh air fan. When the air conditioner reaches the defrost condition during heating operation, the indoor fan and / or fresh air fan are controlled to operate in a first direction. Specifically, when the first fan includes an indoor fan and a fresh air fan, the indoor fan and the fresh air fan operate in the same direction and are both in the first direction. In other embodiments, when the air conditioner reaches the defrost condition during heating operation, the indoor fan may stop operating, and the fresh air fan may operate in the first direction; or, when the air conditioner reaches the defrost condition during heating operation, the fresh air fan may stop operating, and the indoor fan may operate in the first direction. In this case, the indoor fan operates in a second direction during air conditioner heating operation, and switches from the second direction to the first direction when the air conditioner reaches the defrost condition during heating operation.

[0067] During the operation of the first fan in the first direction, the fresh air inlet remains open. Indoor air enters the indoor air duct from the indoor air outlet and / or return air inlet. Driven by the first fan, the indoor air exchanges heat with the indoor heat exchanger in the indoor air duct and is then discharged outdoors from the fresh air inlet.

[0068] During the operation of the first fan in the first direction, the operating speed of the first fan can be a pre-set fixed speed or a speed determined according to the actual operating conditions of the air conditioner. Specifically, the first fan includes an indoor fan and a fresh air fan, and the indoor fan speeds can be the same or different. Specifically, in order to improve the heat exchange efficiency of the indoor heat exchanger and avoid air stagnation in the duct, the indoor fan operates at the first speed in the first direction, and the fresh air fan operates at the second speed in the second direction, where the first speed is greater than the second speed.

[0069] This invention proposes a control method for an air conditioner. Based on an air conditioner with an indoor heat exchanger, a first fan, and a fresh air inlet connected to the indoor air duct, when the air conditioner reaches defrosting conditions during heating operation, the method controls the first fan in the indoor air duct to operate in a first direction and controls the air conditioner to operate in cooling mode. During cooling operation, the outdoor heat exchanger releases heat to defrost. The first fan drives indoor air to exchange heat with the indoor heat exchanger, and the air is then discharged outdoors through the fresh air inlet. This enhances heat exchange in the indoor heat exchanger during defrosting, increases the overall pressure level of the refrigerant system, thereby increasing the compressor's exhaust temperature and raising the refrigerant temperature entering the outdoor heat exchanger. Increased heat release from the outdoor heat exchanger accelerates defrosting. Furthermore, the cool air after heat exchange with the indoor heat exchanger is blown outdoors, not indoors, effectively preventing a significant drop in indoor temperature. This reduces indoor temperature fluctuations during defrosting while improving defrosting efficiency.

[0070] Furthermore, in the above embodiments, the step of controlling the air conditioner's cooling operation includes:

[0071] Control the compressor of the air conditioner to reduce its frequency and / or control the second fan of the air conditioner located outdoors to reduce its speed; control the air conditioner to switch from heating operation to cooling operation; control the compressor to increase its frequency.

[0072] Specifically, in this embodiment, the compressor frequency is reduced to a preset minimum frequency, and the second fan speed is reduced to 0. In other embodiments, the compressor frequency can also be reduced at a first rate, and the second fan speed can also be reduced at a second rate.

[0073] After the air conditioner switches to cooling mode, while or after the compressor's operating frequency is increased, the second fan can either remain off or operate at a speed lower than the set speed.

[0074] In this embodiment, when the air conditioner reaches the defrosting condition during heating operation, before switching from heating to cooling operation, the compressor frequency and / or the outdoor fan speed are reduced to reduce the system pressure during the heat exchange mode switching process. When the air conditioner switches to cooling operation, the compressor frequency is further increased to increase the heat required for defrosting. Based on this, it is beneficial to improve the stability of the air conditioner's heat exchange mode switching process and avoid damage to components in the refrigerant circulation loop.

[0075] Furthermore, based on the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, reference is made to... Figure 4 The step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment includes:

[0076] Step S21: Obtain the operating pressure of the air conditioner;

[0077] The operating pressure is specifically obtained by acquiring the data currently detected by the pressure sensor.

[0078] In this embodiment, the operating pressure includes the return gas pressure and / or discharge pressure of the air conditioner's compressor. In other embodiments, the operating pressure may also be the pressure at other locations in the refrigerant circulation loop besides the compressor's discharge and return gas sides, such as the pressure between the outdoor heat exchanger and the throttling device.

[0079] Step S22: Determine the target rotational speed of the first fan based on the operating pressure;

[0080] Different operating pressures correspond to different target speeds. The target speed is negatively correlated with the operating pressure; that is, the lower the operating pressure, the higher the target speed can be.

[0081] The relationship between operating pressure and target speed can be preset or determined based on the current temperature of the outdoor heat exchanger. Different temperatures correspond to different pressure-speed relationships. This relationship can be expressed through calculation formulas, mapping relationships, etc. Based on this relationship, the target speed corresponding to the current operating pressure can be determined.

[0082] When there is more than one first fan, the target speed includes the first sub-target speed of each first fan. For example, if the first fans include indoor fans and fresh air fans, the target speed includes the first sub-target speed of the indoor fans and the second sub-target speed of the fresh air fans. Specifically, the sub-target speed of each first fan corresponding to the operating pressure can be determined based on the correspondence between the pressure and speed of each first fan. Alternatively, the sub-target speed of the target fan among the first fans can be determined based on the operating pressure, and the sub-target speeds of the other fans in the first fan group (excluding the target fan) can be determined based on the preset speed correspondence between the target fan and other fans, according to the sub-target speed corresponding to the target fan.

[0083] Step S23: Control the first fan to run in the first direction at the target speed so that the exhaust pressure of the air conditioner compressor is greater than or equal to the preset pressure.

[0084] The preset pressure here specifically refers to the minimum discharge pressure of the compressor required to make the increase in outdoor heat exchanger volume per unit time exceed a set value. The preset pressure can be a fixed value or a value determined based on the current outdoor ambient temperature. The preset pressure is less than the maximum pressure on the compressor discharge side allowed for reliable operation of the air conditioner. When the first fan operates at the target speed in the first direction, the compressor discharge pressure is less than the maximum pressure and greater than or equal to the preset pressure.

[0085] When there is more than one first fan, each first fan operates in a first direction according to its corresponding sub-target speed. Specifically, the indoor fan operates in a first direction according to the first sub-target speed, and the fresh air fan operates in a second direction according to the second sub-target speed.

[0086] In this embodiment, the target speed of the first fan is determined based on the operating pressure of the air conditioner. This ensures that when the first fan draws indoor air to the outside at the target speed, the heat exchange efficiency of the indoor heat exchanger is high enough to increase the pressure on the low-pressure side of the compressor. This ensures that the compressor discharge pressure is greater than or equal to the preset pressure, allowing the outdoor heat exchanger to output enough heat to quickly melt the frost on the outdoor unit, thereby further improving the defrosting efficiency of the air conditioner.

[0087] Furthermore, in this embodiment, the target rotational speed of the first fan can be determined based on the return gas pressure and / or the exhaust pressure. Different return gas pressures and / or different exhaust pressures can correspond to different target rotational speeds. Specifically, in this embodiment, a first pressure difference value between the exhaust pressure and a preset pressure is determined, and a second pressure difference value between the exhaust pressure and the return gas pressure is determined; the target rotational speed is determined based on the first pressure difference value and the second pressure difference value.

[0088] In this embodiment, the first pressure difference value can be the calculated result obtained by subtracting a preset pressure from the exhaust pressure. In other embodiments, the first pressure difference value can also be the absolute value of the calculated result obtained by subtracting the preset pressure from the exhaust pressure. In this embodiment, the second pressure difference value can be the calculated result obtained by subtracting the return pressure from the exhaust pressure, and the second pressure difference value can be the calculated result obtained by subtracting the exhaust pressure from the return pressure.

[0089] Different first and second differential pressure values ​​correspond to different target speeds. Specifically, the initial speed can be determined based on the second differential pressure value, the speed correction value can be determined based on the first differential pressure value, and the target speed can be obtained by correcting the initial speed based on the speed correction value.

[0090] In this embodiment, combining the first temperature difference value and the second temperature difference value to determine the target speed is beneficial to improving the accuracy of the determined target speed, ensuring that it can be accurately matched with the current output capacity and heat exchange efficiency improvement requirements of the system, so as to effectively further improve the defrosting efficiency of the air conditioner.

[0091] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, the housing is further provided with an indoor air outlet, and the first fan includes an indoor fan disposed corresponding to the indoor air outlet, as shown in the figure. Figure 5 The step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment, and controlling the air conditioner to operate in cooling mode, is defined as step S202. Before step S202, the following steps are also included:

[0092] Step S201: When the air conditioner reaches the defrosting condition during heating operation, control the air conditioner to maintain heating operation, control the indoor fan to reduce its speed and run for a preset time, and / or control the air conditioner's compressor to increase its frequency and run for a preset time.

[0093] During the heating operation of the air conditioner, the indoor fan operates at its initial speed, and the compressor operates at its initial frequency. In this embodiment, when the air conditioner reaches the defrosting condition during heating operation, within a preset duration for which the air conditioner maintains heating operation, the indoor fan decreases its speed by a preset value based on its initial speed, and the compressor may increase its frequency amplitude based on its initial frequency. In other embodiments, within the preset duration for which the air conditioner maintains heating operation, the indoor fan may decrease its speed at a third rate, and the compressor may increase its frequency at a fourth rate.

[0094] In other embodiments, during the preset duration of the air conditioner maintaining heating operation, the indoor fan may reduce its speed while the compressor maintains its current frequency; or, the indoor fan may maintain its current speed while the compressor increases its frequency.

[0095] In this embodiment, when the air conditioner reaches the defrosting condition, it does not immediately switch to cooling mode for defrosting. Instead, it first increases the heat output of the indoor heat exchanger by reducing the speed of the indoor fan and / or increasing the frequency of the compressor. This can increase the air conditioner's heating supply to the room in a short time, allowing the indoor temperature to rise rapidly. After that, it switches to cooling mode for defrosting. This ensures that even if the air conditioner stops supplying heat to the room during the defrosting process, the difference in indoor ambient temperature before and after defrosting is not significant. This effectively reduces indoor temperature fluctuations caused by the air conditioner's defrosting process, thereby improving the comfort of indoor users during the defrosting process.

[0096] Furthermore, based on any of the above embodiments, another embodiment of the control method for the air conditioner of this application is proposed. In this embodiment, the housing is further provided with an indoor air outlet, the first fan includes an indoor fan corresponding to the indoor air outlet, and after step S20, the method further includes:

[0097] Obtain the outdoor heat exchanger temperature; when the outdoor heat exchanger temperature is greater than or equal to a preset temperature, control the air conditioner to operate in heating mode and control the indoor fan to operate in a second direction so that indoor air exchanges heat with the indoor heat exchanger and is then blown into the room; wherein, the preset temperature is the minimum temperature that the outdoor heat exchanger is allowed to reach when the air conditioner finishes defrosting.

[0098] Specifically, the outdoor heat exchanger temperature is obtained by acquiring the data currently detected by the temperature sensor on the outdoor heat exchanger coil. Specifically, during the defrosting process of the air conditioner in cooling mode, the outdoor heat exchanger temperature can be detected at set intervals.

[0099] When the outdoor heat exchanger temperature is greater than or equal to the preset temperature, it indicates that defrosting is complete. At this time, the air conditioner is controlled to operate in heating mode, and the indoor fan is controlled to operate in the second direction so that indoor air exchanges heat with the indoor heat exchanger and is then blown into the room, allowing the air conditioner to resume heating. When the outdoor heat exchanger temperature is less than the preset temperature, it indicates that defrosting is not yet complete. At this time, the air conditioner can be controlled to return to step S20.

[0100] In this embodiment, the indoor fan adopts different directions during heating and defrosting operation to switch the direction of indoor air flow, thereby ensuring indoor thermal comfort while improving the defrosting efficiency of the air conditioner.

[0101] Furthermore, in this embodiment, the first fan also includes a fresh air fan corresponding to the fresh air inlet. Before the step of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in a second direction so that the indoor air exchanges heat with the indoor heat exchanger and is then blown into the room, the method further includes: when the temperature of the outdoor heat exchanger is greater than or equal to a preset temperature, controlling the speed of the fresh air fan and the indoor fan to decrease, and controlling the air conditioner to switch from cooling operation to heating operation; and executing the step of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in the second direction.

[0102] In this embodiment, the rotational speeds of both the indoor fan and the fresh air fan are reduced to 0. In other embodiments, the rotational speeds of the indoor fan and / or the fresh air fan may also be reduced to other preset minimum rotational speeds greater than 0.

[0103] In this embodiment, before switching to heating operation at the end of the defrosting process, both the indoor fan and the fresh air fan operate at reduced speeds to reduce heat exchange in the indoor heat exchanger and lower system pressure. This ensures the stability of the air conditioner's operation during the switch from cooling to heating operation, thus protecting the air conditioner.

[0104] Furthermore, this embodiment of the invention also proposes a storage medium storing a control program for an air conditioner. When the control program for the air conditioner is executed by a processor, it implements the relevant steps of any embodiment of the control method for the air conditioner described above.

[0105] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0106] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0107] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0108] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes a housing, an indoor air duct is provided inside the housing, an indoor heat exchanger and a first fan are provided inside the indoor air duct, and the housing is provided with a fresh air inlet and an indoor air outlet communicating with the indoor air duct. The first fan includes at least an indoor fan corresponding to the indoor air outlet and / or a fresh air fan corresponding to the fresh air inlet. The control method of the air conditioner includes the following steps: Control the air conditioner to operate in heating mode; When the air conditioner reaches the defrosting condition during heating operation, the first fan is controlled to operate in the first direction so that the indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment, thereby controlling the air conditioner to operate in cooling mode.

2. The control method for an air conditioner as described in claim 1, characterized in that, The step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment includes: Obtain the operating pressure of the air conditioner; The target rotational speed of the first fan is determined based on the operating pressure. The first fan is controlled to operate at the first direction according to the target speed, so that the exhaust pressure of the air conditioner compressor is greater than or equal to the preset pressure.

3. The control method for an air conditioner as described in claim 2, characterized in that, The operating pressure includes the return gas pressure and / or exhaust gas pressure of the air conditioner's compressor, and the step of determining the target speed of the first fan based on the operating pressure includes: The target rotational speed is determined based on the return pressure and / or the exhaust pressure.

4. The control method for an air conditioner as described in claim 3, characterized in that, The step of determining the target rotational speed based on the return gas pressure and / or the exhaust pressure includes: Determine a first pressure difference value between the exhaust pressure and the preset pressure, and determine a second pressure difference value between the exhaust pressure and the return gas pressure; The target rotational speed is determined based on the first differential pressure value and the second differential pressure value.

5. The control method for an air conditioner as described in claim 1, characterized in that, The steps for controlling the cooling operation of the air conditioner include: Control the compressor of the air conditioner to reduce its frequency and / or control the second fan of the air conditioner located outdoors to reduce its speed; Control the air conditioner to switch from heating mode to cooling mode; Control the compressor to increase its frequency.

6. The control method for an air conditioner as described in any one of claims 1 to 5, characterized in that, Before the step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged to the outdoor environment through the fresh air inlet, and controlling the air conditioner to operate in cooling mode, the method further includes: When the air conditioner reaches the defrosting condition during heating operation, the air conditioner is controlled to maintain heating operation, the indoor fan is controlled to reduce its speed and run for a preset time, and / or the air conditioner's compressor is controlled to increase its frequency and run for a preset time.

7. The control method for an air conditioner as described in any one of claims 1 to 5, characterized in that, After the step of controlling the first fan to operate in a first direction so that indoor air exchanges heat with the indoor heat exchanger and is then discharged from the fresh air inlet to the outdoor environment when the air conditioner reaches the defrosting condition in heating mode, the method further includes: Obtain the temperature of the outdoor heat exchanger; When the temperature of the outdoor heat exchanger is greater than or equal to the preset temperature, the air conditioner is controlled to operate in heating mode and the indoor fan is controlled to operate in the second direction so that the indoor air exchanges heat with the indoor heat exchanger and is then blown into the room. The preset temperature is the minimum temperature that the outdoor heat exchanger is allowed to reach after the air conditioner finishes defrosting.

8. The control method for an air conditioner as described in claim 7, characterized in that, Before the step of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in a second direction so that indoor air is exchanged with the indoor heat exchanger and then blown into the room, the method further includes: When the outdoor heat exchanger temperature is greater than or equal to the preset temperature, the speed of the fresh air fan and the indoor fan are reduced, and the air conditioner is switched from cooling operation to heating operation. Perform the steps of controlling the air conditioner to operate in heating mode and controlling the indoor fan to operate in the second direction.

9. An air conditioner, characterized in that, The air conditioner includes: The housing has an indoor air duct inside, and the housing has a fresh air inlet and an indoor air outlet that communicate with the indoor air duct. An indoor heat exchanger is disposed within the housing; A first fan is provided in the indoor air duct, and the first fan includes at least an indoor fan provided corresponding to the indoor air outlet and / or a fresh air fan provided corresponding to the fresh air inlet. A control device, wherein the first fan is connected to the control device, the control device comprising: a memory, a processor, and an air conditioner control program stored in the memory and executable on the processor, wherein the air conditioner control program, when executed by the processor, implements the steps of the air conditioner control method as described in any one of claims 1 to 8.

10. A storage medium, characterized in that, The storage medium stores a control program for an air conditioner, which, when executed by a processor, implements the steps of the control method for an air conditioner as described in any one of claims 1 to 8.

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