Control method of air treatment system and air treatment system

Abstract

The invention provides a control method of an air treatment system and the air treatment system. Under the condition that the air processing system conducts heating operation, the outdoor environment temperature and the temperature of an outdoor unit heat exchanger are obtained, the rotating speed of a fan of an outdoor unit is increased under the condition that a first preset condition is met, and the first preset condition comprises that the temperature of the outdoor unit heat exchanger is smaller than or equal to a first threshold value; and the outdoor environment temperature and the outdoor unit heat exchanger temperature meet a first preset relation. Therefore, frosting of the outdoor unit can be inhibited or the frosting speed of the outdoor unit can be reduced, the heating time is prolonged, and the heating effect of the air treatment system is guaranteed; and moreover, frequent switching between the heating mode and the defrosting mode is avoided, noise generated by frequent mode switching can be reduced, and the comfort level of a user is improved.

Description

Technical Field

[0001] The present application relates to the field of air treatment systems, and in particular to a control method for an air treatment system and an air treatment system. Background Art

[0002] With the continuous progress of science and technology and the improvement of living standards, people's requirements for living environment are getting higher and higher. Among them, indoor temperature, humidity, noise, etc. are important indicators of living environment. For example, when the air handling system is in heating operation, the temperature of the outdoor environment is low, and the outdoor unit heat exchanger in the air conditioner outdoor unit may be frosted due to the low temperature. For example, after the fins of the outdoor unit are frosted, the fan of the outdoor unit cannot blow air smoothly, which will directly affect the indoor heating effect. When the conditions for entering the defrost mode are met, the air conditioner will perform defrosting. For example, after the four-way valve of the outdoor unit is reversed, high-temperature refrigerant flows through the outdoor unit heat exchanger for defrosting.

[0003] In the prior art, the defrosting process is usually performed immediately when the temperature of the outdoor heat exchanger is lower than the defrosting temperature or when the temperature of the outdoor heat exchanger drops significantly.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] The inventors found that the existing air handling system immediately defrosts when the temperature of the outdoor unit heat exchanger is lower than the defrost temperature or when the temperature of the outdoor unit heat exchanger drops significantly, which causes the air handling system to frequently switch from the heating operation mode to the defrost mode, resulting in poor heating effect; and frequent switching between the heating operation and defrost modes will frequently generate noise, resulting in a poor user experience.

[0006] In order to solve at least one of the above problems, the embodiment of the present application provides a control method of an air handling system and an air handling system. When performing heating operation, increasing the fan speed of the outdoor unit under the condition of satisfying the first preset condition can speed up the air flow inside and outside the outdoor unit, thereby increasing the temperature of the outdoor unit heat exchanger, inhibiting frost formation in the outdoor unit or reducing the speed of frost formation in the outdoor unit, extending the heating time, and ensuring the heating effect of the air handling system; and avoiding frequent switching between the heating mode and the defrosting mode, which can reduce the noise generated by frequent mode switching and improve user comfort.

[0007] According to a first aspect of an embodiment of the present application, a control method for an air treatment system is provided, wherein the air treatment system comprises an outdoor unit and at least one indoor unit, wherein the indoor unit is connected to the outdoor unit via a refrigerant pipeline, and wherein the outdoor unit comprises an outdoor unit heat exchanger and a compressor; the method comprises: when the air treatment system is in heating operation, obtaining the outdoor ambient temperature and the outdoor unit heat exchanger temperature; increasing the fan speed of the outdoor unit when a first preset condition is satisfied, wherein the first preset condition comprises: the outdoor unit heat exchanger temperature is less than or equal to a first threshold value, and the outdoor ambient temperature and the outdoor unit heat exchanger temperature satisfy a first preset relationship.

[0008] According to a second aspect of an embodiment of the present application, an air treatment system is provided, which includes: an outdoor unit, the outdoor unit including an outdoor unit heat exchanger and a compressor; at least one indoor unit, the indoor unit being connected to the outdoor unit via a refrigerant pipeline; and a control module, which executes the method described in the first aspect of the embodiment of the present application.

[0009] One of the beneficial effects of the embodiment of the present application is that: when performing heating operation, the fan speed of the outdoor unit is increased under the condition that the first preset condition is met, which can speed up the air flow between the inside and outside of the outdoor unit, improve the heat exchange performance of the outdoor unit heat exchanger, and thus increase the temperature of the outdoor unit heat exchanger, that is, avoid the temperature of the outdoor unit heat exchanger from being too low, thereby inhibiting frost formation in the outdoor unit or reducing the speed of frost formation in the outdoor unit, extending the heating time, that is, extending the time interval for repeatedly entering the defrost mode, and ensuring the heating effect of the air treatment system;

[0010] In addition, since the time interval for repeatedly entering the defrost mode is extended, frequent switching between the heating mode and the defrost mode is avoided, the noise generated by frequent mode switching can be reduced, and user comfort can be improved;

[0011] In addition, in the first preset condition for determining whether to increase the speed of the outdoor unit fan, not only the temperature of the outdoor unit heat exchanger is taken into consideration, but also the relationship between the temperature of the outdoor unit heat exchanger and the outdoor ambient temperature. This enables the speed of the outdoor unit fan to be increased at the right time, thereby improving the effect of suppressing frosting of the outdoor unit, delaying frosting, or reducing the speed of frosting of the outdoor unit.

[0012] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

[0013] Feature information described and illustrated for one embodiment may be used in one or more other embodiments in the same or similar manner, combined with feature information in other embodiments, or replace feature information in other embodiments.

[0014] It should be emphasized that the term "include / comprises" when used herein refers to the existence of characteristic information, integers, steps or components, but does not exclude the existence or addition of one or more other characteristic information, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Many aspects of the present application may be better understood with reference to the following drawings. The components in the drawings are not drawn to scale, but are only for the purpose of illustrating the principles of the present application. For the convenience of illustrating and describing some parts of the present application, corresponding parts in the drawings may be enlarged or reduced. The elements and feature information described in one drawing or one embodiment of the present application may be combined with the elements and feature information shown in one or more other drawings or embodiments. In addition, in the drawings, similar reference numerals represent corresponding components in several drawings and may be used to indicate corresponding components used in more than one embodiment.

[0016] In the attached picture:

[0017] Figure 1 is a schematic diagram of an air treatment system according to Example 1 of the present application;

[0018] Figure 2 is a block diagram of an implementation of a control method for an air treatment system of Example 2 of the present application;

[0019] Figure 3 It is a flow chart of the control method of the air treatment system of Example 2 of the present application. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] Example 1

[0022] Embodiment 1 of the present application provides an air treatment system.

[0023] Figure 1 Schematic diagram of the air treatment system of Example 1 of the present application. Figure 1 In the figure, the hollow arrows indicate the flow direction of air in the air handling system.

[0024] like Figure 1 As shown, the air treatment system 100 includes: an outdoor unit 130 and at least one indoor unit 140 , the indoor unit 140 is connected to the outdoor unit 130 via a refrigerant pipeline 160 , and the outdoor unit 130 includes an outdoor unit heat exchanger 131 and a compressor 132 .

[0025] In some embodiments, the air treatment system 100 further includes: at least one humidity control module 120 , and the humidity control module 120 is connected to the outdoor unit 140 via a refrigerant pipeline 160 .

[0026] In some embodiments, the air treatment system 100 further includes: at least one floor heating module 180 , and a water heat exchange unit of the floor heating module 180 is connected to the outdoor unit 130 via a refrigerant pipeline 160 .

[0027] In some embodiments, the air handling system 100 further includes an air supply module 110 having a first fan ( Figure 1 not shown).

[0028] For example, Figure 1 As shown, the humidity control module 120 is disposed at the output side of the air supply module 110 , and is used to control the humidity of the air output by the air supply module 110 .

[0029] In some embodiments, the air supply module 110 and the humidity control module 120 are independently arranged, and the air supply module 110 and the humidity control module 120 are connected through an air pipeline 150, and the air pipeline 150 outputs air to each indoor space.

[0030] For example, Figure 1 As shown, the humidity control module 120 is disposed on the output side of the air supply module 110 , and the humidity control module 120 controls the humidity of the air output by the air supply module 110 , for example, the humidity control module 120 can perform humidification processing or dehumidification processing.

[0031] like Figure 1 As shown, the air supply module 110 outputs air to the humidity control module 120 through the air pipeline 150. The humidity control module 120 humidifies the air output by the air supply module 110, and introduces the humidified air into multiple indoor spaces through the air pipeline 150; thereby, the user's comfort can be further improved.

[0032] In some embodiments, the indoor unit 140 is electrically connected to the air supply module 110. For example, the indoor unit 140 is electrically connected to the air supply module 110 via an air conditioning communication line 170.

[0033] In some embodiments, the indoor unit 140 further includes an indoor unit heat exchanger 141 , and the indoor unit heat exchanger 141 in the indoor unit 140 is connected to the outdoor unit 130 via a refrigerant pipeline 160 .

[0034] In some embodiments, the air handling system 100 further includes an outdoor unit 130 , and the outdoor unit 130 has at least one actuator, for example, the actuator includes at least one of a compressor 132 and an outdoor unit heat exchanger 131 .

[0035] For example, the compressor 132 of the outdoor unit 130 inputs the compressed refrigerant to the outdoor unit heat exchanger 131 or to the indoor unit heat exchanger 141 of the indoor unit 140 , or to the humidity control module 120 .

[0036] In some embodiments, the outdoor unit 130 further includes a fan 133. For example, when the speed of the fan 133 in the outdoor unit 130 increases, the air flow between the outdoor unit 130 and the outdoor environment can be accelerated, thereby improving the heat exchange performance between the refrigerant in the outdoor unit heat exchanger 131 and the outdoor environment.

[0037] In addition, when the rotation speed of the fan 133 in the outdoor unit 130 is reduced, the flow of air between the interior of the outdoor unit 130 and the outdoor environment becomes slower, thereby reducing the heat exchange performance between the refrigerant in the outdoor unit heat exchanger 131 and the outdoor environment.

[0038] For example, when the air handling system is in cooling operation, increasing the fan speed in the outdoor unit 130 can further reduce the refrigerant temperature in the outdoor unit heat exchanger 131 .

[0039] In some embodiments, the actuator of the outdoor unit 130 further includes an outdoor unit side expansion valve, and at least one of a fan speed of the outdoor unit and a compressor speed of the outdoor unit can be indirectly controlled by adjusting the outdoor unit side expansion valve.

[0040] In some embodiments, the water heat exchange unit of the floor heating module 180 is connected to the outdoor unit 130 via the refrigerant pipeline 160 , and the floor heating module 180 is connected to the floor heating heat dissipation pipeline 182 of the indoor space via the floor heating water pipeline 181 .

[0041] For example, the outdoor unit 130 and the floor heating module 180 form an air source heat pump water heater, which uses the heat in the air and the operation of the compressor to heat water; the floor heating module 180 may include a water heat exchange unit, and the refrigerant flowing out of the compressor of the outdoor unit 130 enters the water heat exchange unit of the floor heating module 180 through the refrigerant pipeline 160, exchanges heat with the water, thereby achieving the purpose of heating the water, and the heated water is introduced into the floor heating heat dissipation pipeline 182 of the indoor space through the floor heating water pipeline 181 to heat the indoor space.

[0042] In some embodiments, the outdoor unit 130 and the floor heating module 180 are separate types, or the outdoor unit 130 and the floor heating module 180 are integrated.

[0043] In some embodiments, Figure 1 As shown, the conditioning object of the air treatment system of the present application may include multiple indoor spaces, and the air output by the humidity control module 120 after dehumidification can be respectively supplied to the multiple indoor spaces through air pipelines. In each indoor space, an indoor unit 140 is respectively arranged.

[0044] In addition, in some embodiments, the indoor unit 140 may be installed in part of the indoor space, while not installed in part of the indoor space.

[0045] In some embodiments, the air handling system 100 includes an air conditioning system. The air conditioning system may be a commercial air conditioning system or a household air conditioning system.

[0046] In some embodiments, the air conditioning system may include at least one group of outdoor units and at least one indoor unit connected to each group of outdoor units. That is, in the air conditioning system, one or more groups of outdoor units may be included, each group of outdoor units includes at least one outdoor unit; for a group of outdoor units, the group of outdoor units is connected to at least one indoor unit.

[0047] For example, an air conditioning system includes an outdoor unit and an indoor unit connected to the outdoor unit.

[0048] For example, the air conditioning system includes an outdoor unit and at least two indoor units connected to the outdoor unit.

[0049] For example, the air conditioning system includes at least two outdoor units and at least two indoor units connected to the at least two outdoor units.

[0050] For example, a group of outdoor units and at least one indoor unit connected to the group of outdoor units constitute a refrigerant system, or multiple groups of outdoor units and at least one indoor unit respectively connected to the multiple groups of outdoor units constitute multiple refrigerant systems. Thus, the air-conditioning system may include one refrigerant system or multiple refrigerant systems.

[0051] In some embodiments, the outdoor unit and the indoor unit may be air conditioning equipment of various models, types, forms, and capacities. For example, the indoor unit may be in the form of four-sided air outlet, two-sided air outlet, duct unit, ground air outlet, or skirting air outlet; the outdoor unit may be in the form of single fan upper air outlet, double fan upper air outlet, single fan front air outlet, or double fan front air outlet.

[0052] In some embodiments, the air treatment system of the present application also includes network equipment, for example, the network equipment includes a cloud server 201, a router 202, a gateway device 203 (such as a smart gateway) and a wireless access point 204 (access point, AP), etc.

[0053] For example, a wireless access point 204 can be set in each room and connected to the router 202 through a wireless connection (for example, Wi-Fi, etc.); the gateway device 203 is wirelessly connected to the router 202; and the gateway device 203 is electrically connected to the indoor unit 140 or the outdoor unit 130 through the air-conditioning communication line 170; a wireless access point 204 can be set in each indoor space; in addition, in some embodiments, a wireless access point 204 can be set in some indoor spaces, while no wireless access point 204 is set in some indoor spaces.

[0054] For example, the user may control the APP running on the terminal device 205 to control the operation mode of the air treatment system 100 through the network device. For example, the terminal device 205 is the user's smart phone.

[0055] In some embodiments, the air treatment system 100 further includes a control module, and the control module is used to execute the control method of the embodiment of the present application.

[0056] For example, the control module includes one or more of a gateway device, a control substrate, a centralized controller, a wired controller, and a remote controller.

[0057] Next, the control process of the air treatment system 100 according to the embodiment of the present application is described in detail.

[0058] In an embodiment of the present application, when the air treatment system 100 is in heating operation, the outdoor ambient temperature and the outdoor unit heat exchanger temperature are obtained; the fan speed of the outdoor unit 130 is increased when a first preset condition is met, and the first preset condition includes: the outdoor unit heat exchanger temperature is less than or equal to a first threshold value, and the outdoor ambient temperature and the outdoor unit heat exchanger temperature satisfy a first preset relationship.

[0059] Therefore, when performing heating operation, the fan speed of the outdoor unit is increased under the condition that the first preset condition is met, so that the air flow inside and outside the outdoor unit can be accelerated, and the heat exchange performance of the outdoor unit heat exchanger can be improved, thereby increasing the temperature of the outdoor unit heat exchanger, that is, avoiding the temperature of the outdoor unit heat exchanger from being too low, thereby inhibiting frost formation in the outdoor unit or reducing the speed of frost formation in the outdoor unit, and extending the heating time, that is, extending the time interval for repeatedly entering the defrost mode, and ensuring the heating effect of the air handling system;

[0060] In addition, since the time interval for repeatedly entering the defrost mode is extended, frequent switching between the heating mode and the defrost mode is avoided, the noise generated by frequent mode switching can be reduced, and user comfort can be improved;

[0061] In addition, in the first preset condition for determining whether to increase the speed of the outdoor unit fan, not only the temperature of the outdoor unit heat exchanger is taken into consideration, but also the relationship between the temperature of the outdoor unit heat exchanger and the outdoor ambient temperature. This enables the speed of the outdoor unit fan to be increased at the right time, thereby improving the effect of suppressing frosting of the outdoor unit, delaying frosting, or reducing the speed of frosting of the outdoor unit.

[0062] In some embodiments, the first preset relationship includes: T1≤TH1 and T1≤A×T2+B, wherein T1 is the outdoor unit heat exchanger temperature, T2 is the outdoor ambient temperature, TH1 is the first threshold, and A and B are constants.

[0063] For example, the fan speed of the outdoor unit is increased to increase the temperature of the outdoor unit heat exchanger only when the temperature of the outdoor unit heat exchanger is less than or equal to the first threshold and the temperature of the outdoor unit heat exchanger is less than or equal to "the outdoor ambient temperature multiplied by the constant A+offset B".

[0064] Therefore, the air handling system increases the fan speed of the outdoor unit, thereby increasing the temperature of the outdoor unit heat exchanger to suppress or delay frost formation, rather than directly entering the defrost mode. Since the air handling system is still operating in the heating mode when entering the frost suppression mode, there is no need to switch the refrigerant flow direction to enter the defrost mode. The air handling system will not frequently switch between the heating mode and the defrost mode, which can reduce the noise generated by frequent mode switching and improve user comfort.

[0065] In some embodiments, the specific values ​​of the first threshold, constants A and B can be set according to actual conditions or determined by curve fitting, etc., which will be illustrated below in conjunction with embodiments.

[0066] In some embodiments, the first preset condition includes: the outdoor heat exchanger temperature is less than or equal to the first threshold and the outdoor ambient temperature and the outdoor heat exchanger temperature satisfy the first preset relationship for a first preset time.

[0067] Therefore, the fan speed of the outdoor unit will be increased to suppress or delay frost formation only when the temperature of the outdoor unit heat exchanger is less than or equal to the first threshold value, and the temperature of the outdoor unit heat exchanger is less than or equal to "the outdoor ambient temperature multiplied by a constant A + offset B", and lasts for a first preset time. This can further reduce the noise generated by frequent mode switching and improve user comfort.

[0068] The first preset time can be set according to actual conditions. For example, the first preset time can be 3 minutes, 5 minutes, 7 minutes, etc., and this application does not limit this.

[0069] In some embodiments, the outdoor unit heat exchanger temperature includes at least one of a calculated value and a detected value, the calculated value of the outdoor unit heat exchanger temperature is the refrigerant saturation temperature calculated based on the pressure value detected by the low pressure sensor, and the detected value of the outdoor unit heat exchanger temperature is the temperature value detected by the temperature sensor.

[0070] In some embodiments, the temperature of the outdoor unit heat exchanger 131 can be calculated by using the detection value of a pressure sensor disposed on the refrigerant pipeline 160 of the outdoor unit heat exchanger 131. Alternatively, since the refrigerant flow directions are different when the air handling system is in heating operation and when the air handling system is in cooling operation, the temperature of the outdoor unit heat exchanger 131 can be calculated by using the measurement value of a pressure sensor disposed in the corresponding refrigerant flow direction.

[0071] For example, a low-pressure sensor is arranged at the refrigerant pipeline 160 of the outdoor unit heat exchanger 131. For example, when the air treatment system is in heating operation, the refrigerant saturation temperature is calculated using the detection value of the low-pressure sensor arranged on the pipeline at the refrigerant inlet of the compressor as the temperature of the outdoor unit heat exchanger 131. For example, the refrigerant saturation temperature can be calculated based on the pressure value detected by the low-pressure sensor and the comparison relationship between the saturation temperature and pressure of different refrigerant types as the calculated value of the outdoor unit heat exchanger temperature. For the comparison relationship between the pressure value and the refrigerant saturation temperature, please refer to the relevant technology and will not be repeated here.

[0072] For example, the temperature sensor is arranged on the liquid pipe side of the outdoor unit heat exchanger 131. For example, the temperature sensor is arranged on a branch pipe located at the lower side or the middle part of multiple refrigerant branch pipes on the liquid pipe side of the outdoor unit heat exchanger 131. The temperature sensor directly measures the temperature of the refrigerant pipe 160 of the outdoor unit heat exchanger 131 as the detection value of the outdoor unit heat exchanger temperature.

[0073] In some embodiments, the first preset relationship includes at least one of a second preset relationship and a third preset relationship.

[0074] The second preset relationship includes: T1'≤TH1' and T1'≤A1×T2'+B1,

[0075] The third preset relationship includes: T1"≤TH1" and T1"≤A2×T2"+B2,

[0076] Among them, T1' is the calculated value of the outdoor unit heat exchanger temperature, T1" is the detected value of the outdoor unit heat exchanger temperature, TH1' is the first threshold corresponding to the calculated value, TH1" is the first threshold corresponding to the detected value, T2' and T2" are outdoor ambient temperatures, A1, B1, A2, B2 are constants, and TH1'≠TH1", A1≠A2, B1≠B2.

[0077] In some embodiments, when one of the second preset relationship and the third preset relationship is satisfied, it is considered that the first preset relationship is satisfied, and the speed of the outdoor unit fan is increased;

[0078] For example, when the first preset relationship only includes the second preset relationship, or only includes the third preset relationship, when the corresponding second preset relationship or the third preset relationship is satisfied, it is determined that the first preset relationship is satisfied.

[0079] For example, in the case where the first preset relationship includes a second preset relationship and a third preset relationship, when any one of the second preset relationship and the third preset relationship is satisfied, it is determined that the first preset relationship is satisfied.

[0080] Alternatively, when both the second preset relationship and the third preset relationship are satisfied, the first preset relationship is considered to be satisfied, and the speed of the outdoor unit fan is increased;

[0081] For example, in the case where the first preset relationship includes the second preset relationship and the third preset relationship, when the second preset relationship and the third preset relationship are satisfied at the same time, it is determined that the first preset relationship is satisfied.

[0082] Therefore, by setting different first thresholds for the calculated value of the outdoor unit heat exchanger temperature and the detected value of the outdoor unit heat exchanger temperature, the accuracy of judging the frost critical point can be further improved, as well as the accuracy of judging whether to enter the frost suppression mode. This can reduce the noise generated by frequent mode switching and improve user comfort.

[0083] For example, when the outdoor unit heat exchanger temperature includes a calculated value, the above-mentioned first preset relationship is equal to the second preset relationship, that is, the first preset relationship is: T1'≤TH1' and T1'≤A1×T2'+B1, T1' is the calculated value of the outdoor unit heat exchanger temperature, TH1' is the first threshold corresponding to the calculated value, and T2' is the outdoor ambient temperature.

[0084] For example, the outdoor ambient temperature is detected by a temperature sensor installed outdoors.

[0085] In some embodiments, the specific value of the first threshold can be set according to actual conditions, and the specific values ​​of constants A and B can be obtained by curve fitting. For example, by setting the ambient temperature, the limit value of the frosting temperature can be determined, and by setting different ambient temperatures, the limit values ​​of different frosting temperatures can be determined; according to the different set ambient temperatures, the relationship between constants A and B can be obtained, so that the values ​​of A and B can be determined.

[0086] For example, the refrigerant saturation temperature can be calculated based on the pressure value detected by the low-pressure sensor and the comparison relationship between the saturation temperature and pressure of different refrigerant types to obtain the outdoor unit heat exchanger temperature T'.

[0087] For example, when making a judgment based on the calculated value of the outdoor unit heat exchanger temperature, the judgment is made based on the second preset condition, namely: T1”≤TH1” and T1”≤A1×T2”+B1, T1” is the detected value of the outdoor unit heat exchanger temperature, TH1” is the first threshold value corresponding to the detected value, and T2” is the detected outdoor ambient temperature.

[0088] For example, the temperature of the refrigerant pipe 160 of the outdoor heat exchanger 131 is directly measured by a temperature sensor to obtain the outdoor heat exchanger temperature T′.

[0089] In some embodiments, increasing the fan speed of the outdoor unit includes: when the fan speed of the outdoor unit is divided into multiple levels, increasing the fan speed of the outdoor unit by at least one level, or increasing the motor speed of the fan of the outdoor unit by a preset value.

[0090] For example, when the fan of the outdoor unit has multiple gears, the fan gear can be gradually increased; or, when the motor of the fan of the outdoor unit is linearly variable, the motor speed of the fan can be increased by a preset value.

[0091] In some embodiments, after the fan speed of the outdoor unit is increased by at least one level or the motor speed of the fan of the outdoor unit is increased by a preset value, the outdoor ambient temperature and the outdoor unit heat exchanger temperature continue to be obtained and it is determined again whether the first preset condition is met and the fan speed of the outdoor unit is increased again if the first preset condition is met.

[0092] Therefore, by cyclically judging whether the first preset condition is met and increasing the fan speed of the outdoor unit again when the first preset condition is met, until the fan speed reaches a limited value or a maximum value, by gradually increasing the fan speed or gradually increasing the motor speed of the fan by a preset value, the noise generated by the outdoor unit can be avoided from suddenly increasing, thereby reducing the user's discomfort caused by sudden changes in environmental sounds.

[0093] In some embodiments, the method further includes: when the capacity of the outdoor unit is insufficient, increasing at least one of the fan speed and the compressor speed of the outdoor unit; when the capacity of the outdoor unit is sufficient, reducing at least one of the fan speed and the compressor speed of the outdoor unit.

[0094] For example, whether the capacity of the outdoor unit is insufficient is determined based on whether the capacity of the outdoor unit can meet the load demand of the system. For example, when the indoor temperature of the room where the indoor unit is located reaches the set temperature, the capacity of the outdoor unit is considered sufficient; when the indoor temperature of the room where the indoor unit is located cannot reach the set temperature, the capacity of the outdoor unit is considered insufficient; for example, other methods can also be used to determine whether the capacity of the outdoor unit is sufficient, and this application does not limit this.

[0095] In some embodiments, when the capacity of the outdoor unit is insufficient, increasing at least one of the fan speed and the compressor speed of the outdoor unit includes: increasing the compressor speed, and when the capacity of the outdoor unit is still insufficient, increasing the fan speed of the outdoor unit.

[0096] Therefore, when the capacity of the outdoor unit is insufficient, increasing the compressor speed first can quickly increase the capacity of the outdoor unit to meet the load requirements of the system. In addition, the increase in noise level caused by increasing the compressor speed is less than the increase in noise level caused by increasing the fan speed. Therefore, while quickly and effectively increasing the capacity of the outdoor unit, the increase in noise level can also be controlled to a certain extent.

[0097] For example, when the capacity of the outdoor unit is insufficient, and the speeds of the fan and compressor of the outdoor unit have multiple gears, the speed of the compressor of the outdoor unit is first increased by one or more gears. If the capacity of the outdoor unit is still insufficient, the speed of the fan of the outdoor unit is further increased by one or more gears. If the capacity of the outdoor unit is sufficient, the fan speed of the outdoor unit is no longer increased. Alternatively, when the capacity of the outdoor unit is insufficient, and the motors of the fan and compressor of the outdoor unit are linear stepless speed changeable, the motor speed of the compressor can be first increased by one or more units of preset values. If the capacity of the outdoor unit is still insufficient, the motor speed of the fan can be further increased by one or more units of preset values. If the capacity of the outdoor unit is sufficient, the fan speed of the outdoor unit is no longer increased.

[0098] In some embodiments, when the capacity of the outdoor unit is insufficient, the determination of whether the air handling system satisfies the first preset condition is not performed.

[0099] Therefore, when the capacity of the outdoor unit is insufficient, priority is given to ensuring the capacity of the outdoor unit to meet the load demand of the system.

[0100] For example, when the capacity of the outdoor unit is insufficient, the compressor speed is increased. If the capacity of the outdoor unit is still insufficient, the fan speed of the outdoor unit is increased, and whether the air handling system meets the first preset condition is not determined.

[0101] In some embodiments, when the capacity of the outdoor unit is sufficient, at least one of a fan speed and a compressor speed of the outdoor unit is reduced when the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger satisfy a fourth preset relationship.

[0102] In some embodiments, when the capacity of the outdoor unit is sufficient, reducing at least one of the fan speed and the compressor speed of the outdoor unit includes: reducing the fan speed of the outdoor unit, and when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the outdoor unit heat exchanger temperature still satisfy the fourth preset relationship, further reducing the compressor speed.

[0103] Therefore, when the capacity of the outdoor unit is sufficient, the sound value reduced by reducing the fan speed of the outdoor unit by one level or one unit of the preset value is greater than the sound value reduced by reducing the compressor speed of the outdoor unit by one level or one unit of the preset value. Therefore, prioritizing reducing the fan speed of the outdoor unit can further improve the user's comfort.

[0104] For example, when the capacity of the outdoor unit is sufficient, and the speeds of the fan and compressor of the outdoor unit have multiple gears, the fan speed of the outdoor unit is first reduced by one or more gears, and when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the outdoor unit heat exchanger temperature still satisfy the fourth preset relationship, the compressor speed is further reduced. When the capacity of the outdoor unit is insufficient, the compressor speed is no longer reduced; or, when the capacity of the outdoor unit is sufficient, and the motors of the fan and compressor of the outdoor unit are linear stepless speed change, the fan speed of the outdoor unit is first reduced by one or more units of the preset value, and when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the outdoor unit heat exchanger temperature still satisfy the fourth preset relationship, the compressor speed is further reduced by one or more units of the preset value. When the capacity of the outdoor unit is insufficient, the compressor speed is no longer reduced.

[0105] In some embodiments, the fourth preset relationship includes: the outdoor unit heat exchanger temperature is greater than or equal to a second threshold, or the outdoor unit heat exchanger temperature is less than the second threshold, and the difference between the outdoor ambient temperature and the outdoor unit heat exchanger temperature is less than a third threshold.

[0106] Thus, when the capacity of the outdoor unit is sufficient and the possibility of frost formation in the outdoor unit is low, at least one of the fan speed and the compressor speed is reduced, thereby reducing the noise of the outdoor unit and improving the user comfort.

[0107] The specific values ​​of the second threshold and the third threshold can be set according to actual conditions. For example, the second threshold is "1°C" and the third threshold is "3°C". When the temperature of the outdoor unit heat exchanger is greater than or equal to 1°C, the fan speed of the outdoor unit is reduced; or when the temperature of the outdoor unit heat exchanger is less than 1°C and the difference between the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger is less than "3°C", the fan speed of the outdoor unit is reduced.

[0108] In some embodiments, when the air handling system is in heating operation and satisfies a second preset condition, the defrost mode is entered, wherein the second preset condition includes: the temperature of the outdoor unit heat exchanger is less than or equal to a fourth threshold, and the fourth threshold is less than the first threshold.

[0109] Therefore, through the aforementioned control of suppressing or delaying frost formation, the timing of satisfying the outdoor unit heat exchanger temperature being less than or equal to the fourth threshold is extended, and the defrost mode is entered when the outdoor unit heat exchanger temperature is less than or equal to the fourth threshold. When necessary, the air treatment system can be switched from the heating mode to the defrost mode for defrosting, which can reduce the frequency of sudden changes in outdoor unit noise caused by defrosting and improve user comfort.

[0110] For example, in the case where the calculated value of the outdoor unit heat exchanger temperature is the refrigerant saturation temperature calculated based on the pressure value detected by the low-pressure sensor, the refrigerant saturation temperature can be calculated based on the pressure value detected by the low-pressure sensor and the comparison relationship between the saturation temperature and pressure of different refrigerant types to obtain the outdoor unit heat exchanger temperature. The first threshold value is "0°C", and the corresponding fourth threshold value can be "-8°C". When the outdoor unit heat exchanger temperature is less than or equal to -8°C, the defrost mode is entered; or, in the case where the detected value of the outdoor unit heat exchanger temperature is the temperature value detected by the temperature sensor, the temperature of the outdoor unit heat exchanger 131 is directly measured by the temperature sensor to obtain the outdoor unit heat exchanger temperature. The first threshold value is "1°C", and the corresponding fourth threshold value can be "-7°C". When the outdoor unit heat exchanger temperature is less than or equal to -7°C, the defrost mode is entered.

[0111] For example, after entering the defrost mode, after the four-way valve (not shown) of the outdoor unit 130 is switched, the high-temperature refrigerant output by the compressor 132 enters the outdoor unit heat exchanger 131 for defrosting.

[0112] According to the above embodiment, when the heating operation is performed, the fan speed of the outdoor unit is increased under the condition that the first preset condition is met, which can speed up the air flow between the inside and outside of the outdoor unit, improve the heat exchange capacity of the outdoor unit heat exchanger, and thus increase the temperature of the outdoor unit heat exchanger (i.e., increase the refrigerant temperature in the outdoor heat exchanger), that is, avoid the temperature of the outdoor unit heat exchanger being too low, thereby suppressing the frosting of the outdoor unit or reducing the speed of the frosting of the outdoor unit, and extending the heating time, that is, extending the time interval for repeatedly entering the defrost mode, thereby ensuring the heating effect of the air handling system; and, since the time interval for repeatedly entering the defrost mode is extended, frequent switching between the heating mode and the defrost mode is avoided, the noise generated by frequent mode switching can be reduced, and the user comfort can be improved; in addition, in the first preset condition for determining whether to increase the fan speed of the outdoor unit, not only the temperature of the outdoor unit heat exchanger is considered, but also the relationship between the temperature of the outdoor unit heat exchanger and the outdoor ambient temperature is considered, so that the fan speed of the outdoor unit can be increased at an accurate time, thereby improving the effect of suppressing the frosting of the outdoor unit, delaying the frosting, or reducing the speed of the frosting of the outdoor unit.

[0113] Example 2

[0114] Embodiment 2 of the present application provides a control method for an air treatment system, wherein the air treatment system is the air treatment system described in Embodiment 1. The specific structure of the air treatment system can be referred to the description in Embodiment 1, and will not be repeated here.

[0115] Figure 2 is a block diagram of an implementation method of the air treatment system control method of Example 2 of the present application. Figure 2 As shown, the method includes:

[0116] Step 201: When the air handling system is in heating operation, obtaining the outdoor environment temperature and the outdoor unit heat exchanger temperature;

[0117] Step 202: Increase the fan speed of the outdoor unit when a first preset condition is satisfied. The first preset condition includes: the outdoor unit heat exchanger temperature is less than or equal to a first threshold, and the outdoor ambient temperature and the outdoor unit heat exchanger temperature satisfy a first preset relationship.

[0118] In some embodiments, the first preset relationship includes: T1≤TH1 and T1≤A×T2+B, wherein T1 is the outdoor unit heat exchanger temperature, T2 is the outdoor ambient temperature, TH1 is the first threshold, and A and B are constants.

[0119] In some embodiments, the first preset condition includes: the outdoor heat exchanger temperature is less than or equal to the first threshold and the outdoor ambient temperature and the outdoor heat exchanger temperature satisfy the first preset relationship for a first preset time.

[0120] In some embodiments, the outdoor unit heat exchanger temperature includes at least one of a calculated value and a detected value, the calculated value of the outdoor unit heat exchanger temperature is the refrigerant saturation temperature calculated based on the pressure value detected by the low pressure sensor, and the detected value of the outdoor unit heat exchanger temperature is the temperature value detected by the temperature sensor.

[0121] In some embodiments, the first preset relationship includes at least one of a second preset relationship and a third preset relationship, the second preset relationship includes: T1'≤TH1' and T1'≤A1×T2'+B1, the third preset relationship includes: T1"≤TH1" and T1"≤A2×T2"+B2, wherein T1' is the calculated value of the outdoor unit heat exchanger temperature, T1" is the detected value of the outdoor unit heat exchanger temperature, TH1' is the first threshold corresponding to the calculated value, TH1" is the first threshold corresponding to the detected value, T2' and T2" are outdoor ambient temperatures, A1, B1, A2, B2 are constants, and TH1'≠TH1", A1≠A2, B1≠B2.

[0122] In some embodiments, increasing the fan speed of the outdoor unit includes: when the fan speed of the outdoor unit is divided into multiple levels, increasing the fan speed of the outdoor unit by at least one level, or increasing the motor speed of the fan of the outdoor unit by a preset value.

[0123] In some embodiments, after the fan speed of the outdoor unit is increased by at least one level or the motor speed of the fan of the outdoor unit is increased by a preset value, the outdoor ambient temperature and the outdoor unit heat exchanger temperature continue to be obtained and it is determined again whether the first preset condition is met and the fan speed of the outdoor unit is increased again if the first preset condition is met.

[0124] In some embodiments, Figure 2 As shown, the method may also include:

[0125] Step 203: When the capacity of the outdoor unit is insufficient, at least one of the fan speed and the compressor speed of the outdoor unit is increased; when the capacity of the outdoor unit is sufficient, at least one of the fan speed and the compressor speed of the outdoor unit is reduced.

[0126] In some embodiments, step 203 is performed in parallel with steps 201 - 202 .

[0127] In addition, when the capacity of the outdoor unit is insufficient, steps 201-202 may not be performed.

[0128] In some embodiments, in step 203, when the capacity of the outdoor unit is insufficient, increasing at least one of the fan speed and the compressor speed of the outdoor unit includes: increasing the compressor speed, and when the capacity of the outdoor unit is still insufficient, increasing the fan speed of the outdoor unit.

[0129] In some embodiments, when the capacity of the outdoor unit is insufficient, the determination of whether the air handling system satisfies the first preset condition is not performed.

[0130] In some embodiments, when the capacity of the outdoor unit is sufficient, at least one of a fan speed and a compressor speed of the outdoor unit is reduced when the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger satisfy a fourth preset relationship.

[0131] In some embodiments, when the capacity of the outdoor unit is sufficient, reducing at least one of the fan speed and the compressor speed of the outdoor unit includes: reducing the fan speed of the outdoor unit, and when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the outdoor unit heat exchanger temperature still satisfy a fourth preset relationship, further reducing the compressor speed.

[0132] In some embodiments, the fourth preset relationship includes: the outdoor unit heat exchanger temperature is greater than or equal to a second threshold, or the outdoor unit heat exchanger temperature is less than the second threshold, and the difference between the outdoor ambient temperature and the outdoor unit heat exchanger temperature is less than a third threshold.

[0133] In some embodiments, Figure 2 As shown, the method may also include:

[0134] Step 204: When the air handling system is in heating operation and satisfies a second preset condition, enters a defrost mode, wherein the second preset condition includes: the temperature of the outdoor unit heat exchanger is less than or equal to a fourth threshold, and the fourth threshold is less than the first threshold.

[0135] In some embodiments, step 204 is performed in parallel with step 202 .

[0136] In addition, when the second preset condition is met, the defrost mode is directly entered without executing step 202 .

[0137] Figure 3 is a flow chart of a control method of an air treatment system according to Embodiment 2 of the present application. Figure 3 As shown, the method includes:

[0138] Step 301: Determine whether the air handling system is in heating operation; when the determination result is "yes", proceed to step 302; when the determination result is "no", return;

[0139] Step 302: Obtaining the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger;

[0140] Step 303: Determine whether the first preset condition is met. When the judgment result is "yes", go to step 304. When the judgment result is "no", return to step 301 or step 302. For example, the first preset condition includes: the outdoor unit heat exchanger temperature is less than or equal to the first threshold, and the outdoor ambient temperature and the outdoor unit heat exchanger temperature meet the first preset relationship.

[0141] Step 304: increasing the fan speed of the outdoor unit, and returning to step 302 after increasing the fan speed of the outdoor unit; for example, when the fan speed of the outdoor unit is divided into multiple levels, increasing the fan speed of the outdoor unit by at least one level, or increasing the motor speed of the fan of the outdoor unit by a preset value;

[0142] Step 305: Determine whether the capacity of the outdoor unit is sufficient. If the determination result is "yes", proceed to step 307; if the determination result is "no", proceed to step 306;

[0143] Step 306: increasing at least one of the fan speed and the compressor speed of the outdoor unit, for example, increasing the compressor speed first, and then increasing the fan speed of the outdoor unit when the capacity of the outdoor unit is still insufficient; at this time, it is not determined whether the air handling system is in heating operation and whether the first preset condition is met;

[0144] Step 307: Determine whether the outdoor ambient temperature and the outdoor heat exchanger temperature satisfy a fourth preset relationship. When the judgment result is "yes", proceed to step 308; when the judgment result is "no", return to step 305; for example, the fourth preset relationship includes: the outdoor heat exchanger temperature is greater than or equal to the second threshold, or the outdoor heat exchanger temperature is less than the second threshold, and the difference between the outdoor ambient temperature and the outdoor heat exchanger temperature is less than the third threshold;

[0145] Step 308: reducing at least one of the fan speed and the compressor speed of the outdoor unit, for example, first reducing the fan speed of the outdoor unit, and then reducing the compressor speed when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger still satisfy the fourth preset relationship;

[0146] Step 309: Determine whether the second preset condition is met. When the judgment result is "yes", proceed to step 310. When the judgment result is "no", return to step 301 or 302. For example, the second preset condition includes: the temperature of the outdoor unit heat exchanger is less than or equal to the fourth threshold, and the fourth threshold is less than the first threshold.

[0147] Step 310: Perform defrosting processing and return after the defrosting processing is completed.

[0148] In the above embodiment of the present application, steps 303-304, steps 305-308 and steps 309-310 can be executed in parallel. In addition, when step 305 is judged as "no", steps 303 and 304 are no longer executed. In addition, when step 309 is judged as "yes", step 310 is executed, and steps 303 and 304 are no longer executed during the defrosting process. Other possible step processes are not given one by one.

[0149] The specific implementation of the above steps can refer to the relevant records in Example 1, and will not be repeated here.

[0150] According to the above embodiment, when the heating operation is performed, the fan speed of the outdoor unit is increased under the condition that the first preset condition is met, which can speed up the air flow between the inside and outside of the outdoor unit, improve the heat exchange capacity of the outdoor unit heat exchanger, and thus increase the temperature of the outdoor unit heat exchanger (i.e., increase the refrigerant temperature in the outdoor heat exchanger), that is, avoid the temperature of the outdoor unit heat exchanger being too low, thereby suppressing the frosting of the outdoor unit or reducing the speed of the frosting of the outdoor unit, and extending the heating time, that is, extending the time interval for repeatedly entering the defrost mode, thereby ensuring the heating effect of the air handling system; and, since the time interval for repeatedly entering the defrost mode is extended, frequent switching between the heating mode and the defrost mode is avoided, the noise generated by frequent mode switching can be reduced, and the user comfort can be improved; in addition, in the first preset condition for determining whether to increase the fan speed of the outdoor unit, not only the temperature of the outdoor unit heat exchanger is considered, but also the relationship between the temperature of the outdoor unit heat exchanger and the outdoor ambient temperature is considered, so that the fan speed of the outdoor unit can be increased at an accurate time, thereby improving the effect of suppressing the frosting of the outdoor unit, delaying the frosting, or reducing the speed of the frosting of the outdoor unit.

[0151] The embodiment of the present application also provides a computer-readable program, wherein when the program is executed, the program enables the computer to execute the control method of the air treatment system described in Example 2.

[0152] An embodiment of the present application further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer-readable program enables a computer to execute the control method of the air treatment system described in Example 2.

[0153] The above devices and methods of the embodiments of the present application can be implemented by hardware, or by hardware combined with software. The present application relates to such a computer-readable program, which, when executed by a logic component, enables the logic component to implement the above devices or components, or enables the logic component to implement the above methods or steps.

[0154] The embodiments of the present application also relate to a storage medium for storing the above program, such as a hard disk, a magnetic disk, an optical disk, a DVD, a flash memory, etc.

[0155] It should be noted that the limitations of the various steps involved in this application, without affecting the implementation of the specific scheme, are not deemed to limit the order of the steps. The steps written in front can be executed first, or later, or even simultaneously. As long as this scheme can be implemented, it should be regarded as belonging to the scope of protection of this application.

[0156] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

Claims

1. A control method for an air treatment system, the air treatment system comprising an outdoor unit and at least one indoor unit, the indoor unit being connected to the outdoor unit via a refrigerant pipeline, the outdoor unit comprising an outdoor unit heat exchanger and a compressor; It is characterized in that The method comprises: When the air handling system is in heating operation, obtaining the outdoor ambient temperature and the outdoor unit heat exchanger temperature; The fan speed of the outdoor unit is increased when a first preset condition is met, wherein the first preset condition includes: the temperature of the outdoor unit heat exchanger is less than or equal to a first threshold, and the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger meet a first preset relationship.

2. The method according to claim 1, characterized in that: The first preset relationship includes: T1≤TH1 and T1≤A×T2+B, wherein T1 is the outdoor unit heat exchanger temperature, T2 is the outdoor ambient temperature, TH1 is the first threshold, and A and B are constants.

3. The method according to claim 1, characterized in that The first preset condition includes: the outdoor heat exchanger temperature is less than or equal to the first threshold value and the outdoor ambient temperature and the outdoor heat exchanger temperature satisfy the first preset relationship for a first preset time.

4. The method according to claim 1, characterized in that The outdoor unit heat exchanger temperature includes at least one of a calculated value and a detected value. The calculated value of the outdoor unit heat exchanger temperature is the refrigerant saturation temperature calculated according to the pressure value detected by the low pressure sensor, and the detected value of the outdoor unit heat exchanger temperature is the temperature value detected by the temperature sensor.

5. The method according to claim 4, characterized in that The first preset relationship includes at least one of a second preset relationship and a third preset relationship, The second preset relationship includes: T1'≤TH1' and T1'≤A1×T2'+B1, The third preset relationship includes: T1"≤TH1" and T1"≤A2×T2"+B2, Among them, T1' is the calculated value of the outdoor unit heat exchanger temperature, T1" is the detected value of the outdoor unit heat exchanger temperature, TH1' is the first threshold corresponding to the calculated value, TH1" is the first threshold corresponding to the detected value, T2' and T2" are outdoor ambient temperatures, A1, B1, A2, B2 are constants, and TH1'≠TH1", A1≠A2, B1≠B2.

6. The method according to claim 1, characterized in that Increasing the fan speed of the outdoor unit includes: When the fan speed of the outdoor unit is divided into a plurality of levels, the fan speed of the outdoor unit is increased by at least one level, or, The motor speed of the fan of the outdoor unit is increased to a preset value.

7. The method according to claim 6, characterized in that The method further comprises: After increasing the fan speed of the outdoor unit by at least one level or increasing the motor speed of the fan of the outdoor unit by a preset value, continue to obtain the outdoor ambient temperature and the outdoor unit heat exchanger temperature and determine again whether the first preset condition is met and increase the fan speed of the outdoor unit again if the first preset condition is met.

8. The method according to claim 1, characterized in that The method further comprises: When the capacity of the outdoor unit is insufficient, increasing at least one of a fan speed and a compressor speed of the outdoor unit; When the capacity of the outdoor unit is sufficient, at least one of a fan speed and a compressor speed of the outdoor unit is reduced.

9. The method according to claim 8, characterized in that When the capacity of the outdoor unit is insufficient, increasing at least one of a fan speed and a compressor speed of the outdoor unit comprises: The compressor speed is increased, and when the capacity of the outdoor unit is still insufficient, the fan speed of the outdoor unit is further increased.

10. The method according to claim 8, characterized in that When the capacity of the outdoor unit is insufficient, the determination of whether the air handling system satisfies the first preset condition is not performed.

11. The method according to claim 8, characterized in that The method further comprises: When the capacity of the outdoor unit is sufficient, When the outdoor ambient temperature and the outdoor unit heat exchanger temperature satisfy a fourth preset relationship, at least one of a fan speed and a compressor speed of the outdoor unit is reduced.

12. The method according to claim 11, characterized in that When the capacity of the outdoor unit is sufficient, reducing at least one of a fan speed and a compressor speed of the outdoor unit comprises: The fan speed of the outdoor unit is reduced, and when the capacity of the outdoor unit is still sufficient and the outdoor ambient temperature and the temperature of the outdoor unit heat exchanger still satisfy the fourth preset relationship, the compressor speed is further reduced.

13. The method according to claim 11, characterized in that The fourth preset relationship includes: The outdoor unit heat exchanger temperature is greater than or equal to a second threshold, or, The outdoor heat exchanger temperature is less than the second threshold, and a difference between the outdoor ambient temperature and the outdoor heat exchanger temperature is less than a third threshold.

14. The method according to claim 1, characterized in that The method further comprises: When the air handling system is in heating operation and satisfies a second preset condition, the defrost mode is entered, wherein the second preset condition includes: the temperature of the outdoor unit heat exchanger is less than or equal to a fourth threshold, and the fourth threshold is less than the first threshold.

15. An air treatment system, characterized in that: The air handling system comprises: An outdoor unit, the outdoor unit comprising an outdoor unit heat exchanger and a compressor; at least one indoor unit, the indoor unit being connected to the outdoor unit via a refrigerant pipeline; and A control module, which executes the control method described in any one of claims 1-14.

16. The air treatment system according to claim 15, characterized in that The air treatment system further comprises: at least one humidity control module, wherein the humidity control module is connected to the outdoor unit via a refrigerant pipeline; or At least one floor heating module, the water heat exchange unit of the floor heating module is connected to the outdoor unit through a refrigerant pipeline.

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