Control method of air conditioner and air conditioner

Abstract

The invention relates to the field of air conditioners, particularly provides a control method of an air conditioner and the air conditioner, and aims to solve the problem that an existing air conditioner cannot efficiently operate on the premise of preventing frosting. In order to achieve the purpose, the control method of the air conditioner comprises the steps that in a heating mode, a defrosting program is controlled to be started; after the defrosting program is started, the actual low pressure is obtained; adjusting a preset target high pressure based on the actual low pressure and the first low pressure; based on the adjusted target high pressure, a compressor is controlled to operate; wherein the first low pressure is the saturation pressure corresponding to the current dew point temperature. According to the control method, the frosting condition of the air conditioner and the operation condition of the air conditioner can be effectively combined, and it is guaranteed that the air conditioner can operate efficiently on the premise that frosting is prevented.

Description

Technical Field

[0001] The present invention relates to the field of air conditioners, and in particular provides a control method of an air conditioner and an air conditioner. Background Art

[0002] In heating mode, and when the outdoor humidity is high, in order to reduce excessive frosting, the air conditioner needs to be controlled to perform frequent defrosting operations, but the defrosting operation will interrupt heating and cause unwanted refrigerant noise to the user.

[0003] During the defrost operation, in order to avoid interrupting heating and reduce the refrigerant noise during the defrost operation, the current defrost solution includes controlling the operation of the compressor based on parameters such as the evaporation temperature. However, this solution may not be able to ensure a reasonable balance between defrosting and air-conditioning operation, that is, the air conditioner cannot guarantee efficient operation while being able to prevent frost.

[0004] Accordingly, the art requires a new air conditioner control method and air conditioner to solve the above problems. Summary of the invention

[0005] The present invention aims to solve the above technical problem, that is, to solve the problem that the existing air conditioner cannot guarantee efficient operation under the premise of preventing frost.

[0006] In a first aspect, the present invention provides a method for controlling an air conditioner, comprising: in a heating mode, obtaining an actual low pressure of the air conditioner; adjusting a preset target high pressure based on the actual low pressure and a first low pressure; and controlling the operation of a compressor based on the adjusted target high pressure; wherein the first low pressure is a saturated pressure corresponding to a current dew point temperature.

[0007] The preset target high pressure is adjusted based on the actual low pressure and the first low pressure, and the compressor operates according to the adjusted target high pressure, so that the actual low pressure and the target high pressure of the air conditioner can be within a reasonable range, and since the first low pressure is the saturation pressure corresponding to the current dew point temperature, the frosting condition of the unit can be reflected by the relationship between the actual low pressure and the first low pressure. Therefore, the above control method can effectively combine the frosting condition of the air conditioner with the operating condition of the air conditioner, to ensure that the air conditioner can operate efficiently while preventing frosting.

[0008] In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "adjusting the preset target high pressure based on the actual low pressure and the first low pressure" further includes: comparing the actual low pressure with the first low pressure; when the actual low pressure is less than the first low pressure, controlling the preset target high pressure to be reduced by a first adjustment value.

[0009] In the preferred technical solution of the control method of the above-mentioned air conditioner, after the step of "controlling the preset target high-pressure pressure to be reduced by a first adjustment value", the control method also includes: judging the size of the lowered target high-pressure pressure and the preset high-pressure minimum value; when the lowered target high-pressure pressure is greater than the high-pressure minimum value, continuing to control the target high-pressure pressure to be reduced by the first adjustment value; and / or when the lowered target high-pressure pressure is less than the high-pressure minimum value, controlling the target high-pressure pressure to increase to the high-pressure minimum value.

[0010] In the preferred technical solution of the control method of the above-mentioned air conditioner, the control method also includes: comparing the actual low pressure and the second low pressure; when the actual low pressure is greater than the second low pressure, controlling the preset target high pressure to increase by a second adjustment value; wherein the second low pressure is equal to the sum of the first low pressure and a first preset value, and the first preset value is a positive number.

[0011] In the preferred technical solution of the control method of the above-mentioned air conditioner, after the step of "controlling the preset target high pressure to increase the second adjustment value", the control method also includes: judging the size of the actual low pressure and the third low pressure; when the actual low pressure is greater than the second low pressure and less than the third low pressure, continuing to control the target high pressure to increase the second adjustment value until the actual low pressure is greater than or equal to the third low pressure; wherein the third low pressure is equal to the sum of the first low pressure and the second preset value, and the second preset value is a positive number and greater than the first preset value.

[0012] In the preferred technical solution of the control method of the air conditioner, the control method further comprises: obtaining the outdoor environmental humidity when the compressor is started; and controlling the frequency increase speed of the compressor based on the outdoor environmental humidity.

[0013] When the compressor starts, it is necessary to quickly increase the frequency of the compressor for rapid heating. However, the disadvantage of quickly increasing the frequency of the compressor is that the low pressure drops too much at the beginning of the compressor startup. Under high humidity conditions, many factors will cause the outdoor heat exchanger (evaporator) to frost, thus creating conditions for the outdoor heat exchanger to frost easily. Therefore, when the compressor starts, based on the outdoor ambient humidity, controlling the frequency increase speed of the compressor can ensure the effective operation of the air conditioning unit on the basis of delaying frosting, so that the air conditioning can achieve an effective balance between delaying frosting and ensuring heating.

[0014] In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "controlling the frequency increase speed of the compressor based on the outdoor ambient humidity" further includes: when the outdoor ambient humidity is greater than a first preset humidity value and less than a second preset humidity value, controlling the frequency increase speed of the compressor to decrease as the outdoor ambient humidity increases.

[0015] In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "controlling the frequency increase speed of the compressor based on the outdoor ambient humidity" further includes: when the outdoor ambient humidity is less than or equal to the first preset humidity value or greater than or equal to the second preset humidity value, controlling the frequency increase speed of the compressor to remain unchanged.

[0016] In the preferred technical solution of the control method of the above-mentioned air conditioner, the step of "obtaining the actual low-pressure pressure of the air conditioner in heating mode" further includes: in heating mode, obtaining the outdoor ambient temperature; when the outdoor ambient temperature is greater than or equal to 0°C and less than or equal to a preset temperature, obtaining the actual low-pressure pressure of the air conditioner; wherein the preset temperature is determined based on an evaporation temperature greater than 0°C.

[0017] In the preferred technical solution of the above-mentioned air conditioner control method, the current dew point temperature is determined based on the following method: obtaining the outdoor ambient temperature and the outdoor ambient humidity; and determining the current dew point temperature based on the outdoor ambient temperature and the outdoor ambient humidity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0019] Figure 1 is a main flow chart of the control method of the air conditioner of the present invention;

[0020] Figure 2 is a graph showing the relationship between the frequency increase speed and relative humidity during the start-up phase of the compressor of the air conditioner of the present invention;

[0021] Figure 3 It is a possible logic diagram of the control method of the air conditioner of the present invention. DETAILED DESCRIPTION

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios, which do not deviate from the principles of the present invention and are within the scope of protection of the present invention.

[0023] In order to solve the problem that the existing air conditioner cannot guarantee efficient operation under the premise of preventing frost. The present invention provides a control method for an air conditioner, which is preferably a multi-split air conditioner, and of course it can also be a one-to-one air conditioner, and the present invention does not limit its specific form. Among them, the air conditioner of the present invention includes an outdoor temperature sensor and an outdoor humidity sensor, the outdoor temperature sensor is used to collect the outdoor ambient temperature, and the outdoor humidity sensor is used to collect the outdoor ambient humidity. The outdoor temperature sensor and the outdoor humidity sensor are preferably arranged on the outdoor unit of the air conditioner, such as at the air outlet of the outdoor unit. The present invention can be provided with a first pressure sensor at the outlet of the compressor, wherein the first pressure sensor is used to obtain the high pressure. A second pressure sensor can be provided at the outlet of the evaporator, and the second pressure sensor is used to obtain the actual low pressure. Of course, this is not restrictive. The second pressure sensor can also be provided at the air intake of the compressor, etc. Of course, the first pressure sensor and the second pressure sensor can also be not provided, but the high pressure and the low pressure can be calculated by temperature. As long as the low pressure and the high pressure can be obtained, these acquisition methods do not deviate from the principle of the present invention and are within the protection scope of the present invention. The control method of the air conditioner of the present invention is introduced below.

[0024] like Figure 1 As shown, the control method of the air conditioner of the present invention includes the following steps.

[0025] Step S100: In heating mode, obtaining the actual low pressure of the air conditioner.

[0026] The user can send a heating instruction through a terminal or a control panel, etc., so that the air conditioner receives the heating instruction, and the air conditioner runs the heating mode after receiving the heating instruction, wherein the terminal can be a remote control, or an APP set on a mobile terminal such as a mobile phone, tablet or computer, or a fixed terminal. Of course, the above introduction is only one of the conditions for running the heating mode. For example, the air conditioner can also automatically execute the heating mode after a certain condition is met, such as automatically executing the heating mode when a certain preset time is reached, etc. These adjustments do not deviate from the principles of the present invention and are within the scope of protection of the present invention. Specifically, in the heating mode, after the compressor starts up, for example, ten minutes after the compressor starts up, when it enters normal operation, the actual low pressure pressure can be obtained through the second pressure sensor introduced above.

[0027] Step S200: adjusting a preset target high pressure based on the actual low pressure and the first low pressure.

[0028] The first low pressure is the saturated pressure corresponding to the current dew point temperature. For example, in step S100, in addition to obtaining the actual low pressure of the air conditioner, the outdoor ambient temperature and the outdoor ambient humidity are also obtained, so as to determine the current dew point temperature based on the outdoor ambient temperature and the outdoor ambient humidity. Specifically, if the dew point temperature a=17.27℃,b=237.7℃. Or you can The above RH is the outdoor environment humidity, RH can be specifically relative humidity, and T is the outdoor environment temperature. Of course, the enthalpy-humidity diagram can also be used to determine the dew point temperature. For example, the intersection of the isotherm and the relative humidity line on the enthalpy-humidity diagram can be determined as the dew point temperature.

[0029] Step S300: Based on the adjusted target high pressure, the compressor is controlled to operate, that is, the frequency of the compressor is adjusted based on the adjusted target high pressure.

[0030] The advantages of the above control method are: the preset target high pressure is adjusted based on the actual low pressure and the first low pressure, and then the compressor operates according to the adjusted target high pressure, so that the actual low pressure and the target high pressure of the air conditioner can be within a reasonable range, and since the first low pressure is the saturation pressure corresponding to the current dew point temperature, the frosting condition of the unit can be reflected through the relationship between the actual low pressure and the first low pressure. Therefore, the above control method can effectively combine the frosting condition of the air conditioner with the operating condition of the air conditioner, ensuring that the air conditioner can operate efficiently while preventing frosting.

[0031] Possibly, step S200 further includes:

[0032] Step S201: Compare the actual low pressure with the first low pressure.

[0033] Step S202: When the actual low pressure is less than the first low pressure, controlling the preset target high pressure to decrease by a first adjustment value.

[0034] For example, when the actual low pressure is less than the first low pressure, the preset target high pressure is controlled to be reduced by 20 kPa, so that the compressor operates based on the reduced target high pressure, causing the compressor to reduce frequency, thereby increasing the actual low pressure of the air conditioner. When the actual low pressure is greater than or equal to the first low pressure, the preset target high pressure is no longer controlled to be reduced, thereby delaying the frosting of the air-conditioning unit.

[0035] Step S203: Determine the magnitude of the reduced target high pressure and the preset high pressure minimum value.

[0036] The preset minimum high pressure value is the bottom line that can ensure the efficient operation of the air conditioner heating, which can be obtained based on experience or experiments. Possibly, the minimum high pressure value is ≥ 2.4MPa, and the minimum high pressure value can be equal to the preset target high pressure minus the preset value, and the preset value should be greater than the first adjustment value.

[0037] Step S204: When the reduced target high pressure is greater than the minimum high pressure value, continue to control the target high pressure to be reduced by the first adjustment value.

[0038] Step S205: When the reduced target high pressure is less than the minimum high pressure value, the target high pressure is controlled to increase to the minimum high pressure value.

[0039] It should be noted that both step S204 and step S205 are performed when the actual low pressure is less than the first low pressure, and when the actual low pressure is greater than or equal to the first low pressure, the target high pressure is no longer controlled to be reduced. That is, when the actual low pressure is less than the first low pressure, the preset target high pressure is reduced by the first adjustment value each time it is reduced, and after each reduction of the target high pressure, the compressor performs frequency adjustment based on the reduced high pressure, and when the actual low pressure is greater than or equal to the first low pressure, the frequency of the compressor is no longer adjusted. For example, after the preset target high pressure is reduced once, the actual low pressure is greater than or equal to the first low pressure, and the frequency of the compressor is no longer adjusted, so as to avoid the unnecessary further reduction of the target high pressure, thereby ensuring that the air conditioner can guarantee the efficient operation of the air conditioner to the maximum extent on the basis of delaying frosting. In addition, in order to ensure the efficient operation of the air conditioner, when the reduced target high pressure is less than the high pressure minimum value, the target high pressure is controlled to increase to the high pressure minimum value, so that the air conditioner adjusts the frequency of the compressor based on the high pressure minimum value, thereby delaying the frosting of the air conditioner as much as possible on the basis of ensuring that the air conditioner can operate efficiently.

[0040] Possibly, the control method of the present invention further comprises:

[0041] Step S400: comparing the actual low pressure with the second low pressure.

[0042] The second low pressure is equal to the sum of the first low pressure and a first preset value, and the first preset value is a positive number. The first preset value can be obtained based on experience or experiments, for example, the first preset value is 20 kPa.

[0043] Step S500: When the actual low pressure is greater than the second low pressure, controlling the preset target high pressure to increase by a second adjustment value.

[0044] When the actual low pressure is greater than the second low pressure, it means that the output capacity of the air-conditioning unit is insufficient while ensuring that the air-conditioning unit is not frosted. At this time, the target high pressure needs to be increased to increase the frequency of the compressor operation.

[0045] Possibly, after step S500, the control method of the present invention further includes the following steps:

[0046] Step S600: Determine the magnitude of the actual low pressure and the third low pressure.

[0047] Step S700: When the actual low pressure is greater than the second low pressure and less than the third low pressure, continue to control the target high pressure to increase by the second adjustment value until the actual low pressure is greater than or equal to the third low pressure.

[0048] The third low pressure is equal to the sum of the first low pressure and the second preset value, and the second preset value is a positive number and greater than the first preset value. The second preset value can be obtained based on experiments or experience, for example, the second preset value is 40 kPa. The second adjustment value is obtained based on experiments or experience or a formula, for example, the second adjustment value is 10 kPa.

[0049] That is to say, when the actual low pressure is greater than the second low pressure and less than the third low pressure, the air conditioning unit is not frosted, but the actual low pressure of the air conditioner is relatively high, while the target high pressure is relatively low, and the maximum capacity of the compressor cannot be exerted. Therefore, the target high pressure is increased by the amplitude of the second adjustment value, thereby increasing the frequency of the compressor and increasing the output. The increasing method is to gradually increase the target high pressure by the amplitude of the second adjustment value, and each time the target high pressure is increased, the compressor is controlled to operate at the adjusted target high pressure, and then it is determined whether the actual low pressure is greater than or equal to the third low pressure. When it is satisfied, it proves that the air conditioner has been adjusted to the optimal output, and the target high pressure is no longer increased.

[0050] Possibly, when the actual low pressure is greater than or equal to the first low pressure and less than or equal to the second low pressure, the air conditioning unit is not frosted, the compressor operates normally, and the frequency of the compressor is not adjusted.

[0051] As a possible implementation, in order to prevent oscillation, the outdoor ambient temperature is obtained every 60 minutes. When the outdoor ambient temperature is greater than or equal to 0°C and less than or equal to the preset temperature, the actual low pressure of the air conditioner is obtained, and then steps S200 to S700 are executed. The preset temperature is determined based on an evaporation temperature greater than 0°C, which can be obtained based on experiments or formulas. For example, when the evaporation temperature is greater than 0°C, the outdoor ambient temperature is measured to obtain an outdoor ambient temperature corresponding to the evaporation temperature greater than 0°C. For example, when the outdoor ambient temperature range is above 10°C, the evaporation temperature is maintained above 0°C, and the air conditioner will not have a frosting problem, and the preset temperature is 10°C. In addition, under sub-zero temperature conditions, there is almost no moisture in the air, and frosting proceeds very slowly. In order to avoid unnecessary capacity reduction during heating operation, the lower limit condition of the outdoor ambient temperature is set to 0°C.

[0052] As a possible implementation, the control method of the present invention further includes the following steps:

[0053] Step S801: When the compressor is started, the outdoor ambient humidity is obtained.

[0054] Step S802: Based on the outdoor ambient humidity, control the frequency increase speed of the compressor.

[0055] When the compressor is started, that is, in the initial stage of the compressor start-up, such as within the preset time range after the compressor is started, it is quite necessary to quickly increase the frequency of the compressor for rapid heating. However, the disadvantage of quickly increasing the frequency of the compressor is that the low pressure drops too much in the initial stage of the compressor start-up. Under high humidity conditions, many factors will cause frost on the outdoor heat exchanger (evaporator), thus creating conditions for the outdoor heat exchanger to frost easily. Therefore, when the compressor is started, based on the outdoor environmental humidity, controlling the frequency increase speed of the compressor can ensure the effective operation of the air-conditioning unit on the basis of delaying frosting, so that the air-conditioning can achieve an effective balance between delaying frosting and ensuring heating. Among them, the above-mentioned outdoor environmental humidity is preferably relative humidity.

[0056] As a possible implementation, step S802 further includes:

[0057] When the outdoor ambient humidity is greater than a first preset humidity value and less than a second preset humidity value, the frequency increase speed of the compressor is controlled to decrease as the outdoor ambient humidity increases.

[0058] For example, Figure 2As shown in the figure below, when the outdoor ambient humidity is greater than 40% and less than 80%, the outdoor heat exchanger of the air conditioner is prone to frost. At this time, the frequency increase speed of the compressor is controlled to decrease with the increase of the outdoor ambient humidity, so as to prevent the excessive drop of the actual low pressure and delay the occurrence of frost. For example, in the figure below, the B value is the multiple of the frequency increase speed reduction, and the larger the value, the smaller the frequency increase speed. For example, B of 4 means 1 / 4 of the normal frequency increase speed. This value may vary depending on the characteristics of the product sample.

[0059] When the outdoor ambient humidity is less than or equal to the first preset humidity value or greater than or equal to the second preset humidity value, the frequency increase speed of the compressor is controlled to remain unchanged.

[0060] When the outdoor ambient humidity is less than or equal to the first preset humidity value or greater than or equal to the second preset humidity value, the air conditioner usually does not have the conditions for frosting. At this time, in order to ensure efficient heating of the air conditioner, the frequency increase speed of the compressor is controlled to remain unchanged, that is, the original frequency increase speed is maintained.

[0061] As a possible implementation, Figure 3 As shown, the control method of the air conditioner of the present invention comprises the following steps:

[0062] Step S901: In heating mode, obtain the outdoor ambient temperature T.

[0063] Step S902: Determine whether 0°C ≤ T ≤ 10°C is established. If yes, execute step S903; if no, return to execute step S901.

[0064] Step S903: Obtain the actual low pressure.

[0065] Step S904: Determine whether the actual low pressure is less than the first low pressure. If yes, execute step S905; otherwise, execute step S909.

[0066] Step S905: Control the preset target high pressure to decrease by 20Kpa.

[0067] Step S906: Determine whether the lowered target high pressure is greater than the low pressure value. If yes, execute step S908; otherwise, execute step S907.

[0068] Step S907: Based on the minimum high pressure value, control the compressor to operate.

[0069] Step S908: adjust the frequency of the compressor based on the adjusted target high pressure, and then return to execute step S904.

[0070] Step S909: Determine whether the actual low pressure> the first low pressure+20Kpa? If yes, execute step S910; if no, execute step S913.

[0071] Step S9010: Control the preset target high pressure to increase by 10Kpa.

[0072] Step S9011: adjusting the frequency of the compressor based on the adjusted target high pressure.

[0073] Step S9012: Determine whether the actual low pressure> the first low pressure+40Kpa? If yes, execute step S913; if no, return to execute step S910.

[0074] Step S9013: Control the compressor frequency to remain unchanged.

[0075] Those skilled in the art can understand that the above-mentioned air conditioner includes some well-known structures, such as a processor, a controller, a memory, etc., wherein the memory includes but is not limited to a random access memory, a flash memory, a read-only memory, a programmable read-only memory, a volatile memory, a non-volatile memory, a serial memory, a parallel memory or a register, etc., and the processor includes but is not limited to a CPLD / FPGA, a DSP, an ARM processor, a MIPS processor, etc. In order to unnecessarily obscure the embodiments of the present disclosure, these well-known structures are not shown in the drawings.

[0076] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, It is characterized in that The control method comprises: In heating mode, obtaining the actual low pressure of the air conditioner; adjusting a preset target high pressure based on the actual low pressure and the first low pressure; controlling the operation of the compressor based on the adjusted target high pressure; The first low pressure is the saturation pressure corresponding to the current dew point temperature.

2. The air conditioner control method according to claim 1, It is characterized in that The step of “adjusting a preset target high pressure based on the actual low pressure and the first low pressure” further includes: Comparing the actual low pressure with the first low pressure; When the actual low pressure is less than the first low pressure, the preset target high pressure is controlled to decrease by a first adjustment value.

3. The air conditioner control method according to claim 2, It is characterized in that After the step of "controlling the preset target high pressure to reduce the first adjustment value", the control method further includes: Determine the magnitude of the reduced target high pressure and the preset high pressure minimum value; When the reduced target high pressure is greater than the high pressure minimum value, continue to control the target high pressure to be reduced by the first adjustment value; and / or When the reduced target high pressure is less than the high pressure minimum value, the target high pressure is controlled to increase to the high pressure minimum value.

4. The air conditioner control method according to claim 1, It is characterized in that The control method further comprises: Comparing the actual low pressure with the second low pressure; When the actual low pressure is greater than the second low pressure, controlling the preset target high pressure to increase by a second adjustment value; The second low pressure is equal to the sum of the first low pressure and a first preset value, and the first preset value is a positive number.

5. The air conditioner control method according to claim 4, It is characterized in that After the step of "controlling the preset target high pressure to increase the second adjustment value", the control method further includes: Determine the magnitude of the actual low pressure and the third low pressure; When the actual low pressure is greater than the second low pressure and less than the third low pressure, continue to control the target high pressure to increase by the second adjustment value until the actual low pressure is greater than or equal to the third low pressure; The third low pressure is equal to the sum of the first low pressure and a second preset value, and the second preset value is a positive number and greater than the first preset value.

6. The air conditioner control method according to claim 1, It is characterized in that The control method further comprises: When the compressor is started, obtaining the outdoor ambient humidity; Based on the outdoor ambient humidity, the frequency increase speed of the compressor is controlled.

7. The air conditioner control method according to claim 6, It is characterized in that The step of "controlling the frequency increase speed of the compressor based on the outdoor ambient humidity" further includes: When the outdoor environment humidity is greater than a first preset humidity value and less than a second preset humidity value, the frequency increase speed of the compressor is controlled to decrease as the outdoor environment humidity increases.

8. The air conditioner control method according to claim 7, It is characterized in that The step of "controlling the frequency increase speed of the compressor based on the outdoor ambient humidity" further includes: When the outdoor environment humidity is less than or equal to the first preset humidity value or greater than or equal to the second preset humidity value, the frequency increase speed of the compressor is controlled to remain unchanged.

9. The method for controlling an air conditioner according to claim 1, It is characterized in that The step of "obtaining the actual low pressure of the air conditioner in the heating mode" further includes: In heating mode, obtain the outdoor ambient temperature; When the outdoor ambient temperature is greater than or equal to 0°C and less than or equal to a preset temperature, obtaining the actual low pressure of the air conditioner; Wherein, the preset temperature is determined based on an evaporation temperature greater than 0°C.

10. The method for controlling an air conditioner according to claim 1, It is characterized in that The current dew point temperature is determined based on the following method: Get the outdoor ambient temperature and outdoor ambient humidity; The current dew point temperature is determined based on the outdoor ambient temperature and the outdoor ambient humidity.

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