Control method of air conditioning system and air conditioning system

Abstract

The present application provides a kind of control method of air conditioning system and air conditioning system, help to ensure the safety and the effectiveness of clean operation of system.In the control method of air conditioning system of the present application, air conditioning system includes outdoor unit and the indoor unit with the refrigerant circuit of the outdoor unit, air conditioning system has the cleaning mode including multiple stages to the inside of indoor unit is cleaned, the control method of air conditioning system includes: abnormal information acquisition step, obtains the abnormal information in the process that air conditioning system executes cleaning mode;Abnormal information judging step, determines the abnormal type according to the abnormal information obtained in abnormal information acquisition step;Stage judging step, determines the stage where cleaning mode is located;And subsequent processing step, according to the abnormal type determined in abnormal information judging step and the stage where cleaning mode is located determined in stage judging step, to determine whether to stop or pause cleaning mode.

Description

TECHNICAL FIELD

[0001] The present application relates to a control method of an air conditioning system and an air conditioning system. BACKGROUND

[0002] After the indoor unit of the air conditioning system is used for a long time, dust will be attached to the interior of the machine, especially to the heat exchanger, which provides sufficient nutrients for the growth of bacteria. Moreover, after the indoor unit is operated in the cooling mode or the dehumidifying mode, the humidity inside the machine is relatively high, which provides an excellent environment for the growth of bacteria. In the indoor unit of the air conditioning system, the growth of bacteria and mildew in the interior of the machine will cause the air blown out to harm the health of the user. When the growth of bacteria and mildew in the interior of the machine is serious, it will also block the apertures of the air outlet grilles and the like, reduce the air volume, and affect the use of the indoor unit.

[0003] In view of the above, there is a technology that makes the indoor unit pass through the four stages of dew formation (uses condensate water to take away dust on the surface of the heat exchanger) → frost formation (makes dust, impurities and the like be stripped from the surface of the heat exchanger) → heating (defrosting, secondary cleaning, and realizes high-temperature sterilization while removing the stripped dust and impurities from the heat exchanger) → ventilation (dries the heat exchanger while reducing the temperature) in sequence by adjusting the operating state of the air conditioning system, so as to realize the cleaning and sterilization of the interior of the machine (see Patent Document 1).

[0004] PRIOR ART DOCUMENT

[0005] Patent Document 1: Chinese Patent No. CN109489189A

[0006] However, when the above technology is used, the operating state of the air conditioning system needs to be switched multiple times, and the air conditioning system is prone to failure in the extreme operating state in which the indoor unit is immediately heated after frost formation. Similarly, the air conditioning system is also prone to failure when operated in extreme (extremely cold or extremely hot) weather conditions.

[0007] In the conventional air conditioning system, if an abnormality occurs during the cooling, heating, air supply and the like, it is usually determined whether the system is stopped according to the type of the abnormality, and the operation is resumed after the abnormality is eliminated. However, when an abnormality occurs in a function mode such as cleaning and mildew prevention that requires continuous operation in multiple steps, the continuity will be destroyed if the operation is stopped, and the function will not be realized. SUMMARY

[0008] The present application is completed in view of the above problems, and aims to provide a control method of an air conditioning system and an air conditioning system, which helps to ensure the safety and effectiveness of the cleaning operation of the system.

[0009] To achieve the above object, the present application provides a control method of an air conditioning system, the air conditioning system including an outdoor unit and an indoor unit forming a refrigerant circuit with the outdoor unit, the air conditioning system having a cleaning mode including a plurality of stages for cleaning an inside of the indoor unit, wherein the control method includes: an abnormality information acquisition step of acquiring abnormality information during execution of the cleaning mode by the air conditioning system; an abnormality information determination step of determining an abnormality type based on the abnormality information acquired in the abnormality information acquisition step; a stage determination step of determining a stage in which the cleaning mode is located; and a subsequent processing step of determining whether to stop or suspend the cleaning mode based on the abnormality type determined in the abnormality information determination step and the stage in which the cleaning mode is located determined in the stage determination step.

[0010] Here, the "stop" means that the cleaning mode is not continued after being interrupted, and the "suspend" means that the cleaning mode is continued after being interrupted.

[0011] According to the control method of the air conditioning system of the present application, the control method includes: an abnormality information acquisition step of acquiring abnormality information during execution of the cleaning mode by the air conditioning system; an abnormality information determination step of determining an abnormality type based on the abnormality information acquired in the abnormality information acquisition step; a stage determination step of determining a stage in which the cleaning mode is located; and a subsequent processing step of determining whether to stop or suspend the cleaning mode based on the abnormality type determined in the abnormality information determination step and the stage in which the cleaning mode is located determined in the stage determination step. Therefore, it is easy to avoid the air conditioning system from malfunctioning due to switching multiple times when the switching is not required, to ensure the safety of the system, and to prevent the air conditioning system from being switched when the switching is not required, which can destroy the continuity of the cleaning mode, and to stop the air conditioning system in time when stopping is required, to ensure the effectiveness of the cleaning mode, to prevent the system from doing useless work, and to achieve energy saving.

[0012] In addition, in the control method of the air conditioning system of the present application, it is preferable that the cleaning mode includes a first cleaning mode, and the first cleaning mode sequentially executes a frosting stage, a defrosting stage, and a drying stage.

[0013] According to the control method of the air conditioning system of the present application, the cleaning operation can be achieved by using the simple first cleaning mode, and in particular, in the frosting stage, the dust impurities and the like are wrapped by frost and attached to the heat exchanger of the indoor unit, in the defrosting stage, the dust impurities and the like flow into the drain pan of the indoor unit with water and are discharged to the outside of the indoor unit, and in the drying stage, the inside of the indoor unit is subjected to drying treatment, so that the heat exchanger of the indoor unit is cleaned while keeping the inside of the indoor unit dry.

[0014] Further, in the control method of the air conditioning system of the present application, preferably, in the subsequent processing step, in the case where it is judged that the abnormality type does not affect the continuity of the cleaning mode, the air conditioning system is caused to continue or pause the execution of the cleaning mode, on the other hand, in the case where it is judged that the abnormality type affects the continuity of the cleaning mode, the air conditioning system is caused to stop the execution of the cleaning mode.

[0015] Here, as the abnormality type that does not affect the continuity of the cleaning mode, there are, for example, an alarm, a display of a fault code, etc., and as the abnormality type that affects the continuity of the cleaning mode, there are, for example, a thermo-off and a shutdown, etc.

[0016] According to the control method of the air conditioning system of the present application, by determining whether to cause the air conditioning system to stop or pause the cleaning mode depending on whether the abnormality type affects the continuity of the cleaning mode, it is easier to avoid the air conditioning system from malfunctioning due to the switching of the operation mode such as the stop of the operation, etc., in the case where it is not necessary, to ensure the safety of the system, and it is easier to prevent the continuity of the cleaning mode from being broken due to the switching of the operation mode such as the stop of the operation, etc., in the case where it is not necessary, and it is possible to cause the air conditioning system to stop in time when it is necessary, to prevent the system from doing useless work, and to achieve energy saving.

[0017] Further, in the control method of the air conditioning system of the present application, preferably, in the subsequent processing step, in the case where the time length T1 required for the elimination of the abnormality type is less than a preset time length Tpd, it is judged that the abnormality type does not affect the continuity of the cleaning mode, on the other hand, in the case where the time length T1 required for the elimination of the abnormality type is the preset time length Tpd or more, it is judged that the abnormality type affects the continuity of the cleaning mode.

[0018] According to the control method of the air conditioning system of the present application, even if the abnormality type is similar to a thermo-off and a shutdown, as long as the time length T1 required for the elimination thereof is less than the preset time length Tpd, it is regarded as not affecting the continuity of the cleaning mode, and the air conditioning system is caused to continue the execution of the cleaning operation, and thus, it is possible to further ensure the continuity of the cleaning operation.

[0019] Further, in the control method of the air conditioning system of the present application, preferably, the cleaning mode includes a second cleaning mode, and the second cleaning mode includes a dewing stage, a stop stage, a supply air stage and a heating stage, which are executed in this order.

[0020] According to the control method of the air conditioning system of the present application, it is possible to adjust the temperature and humidity of the internal environment of the indoor unit by using the second cleaning mode, to destroy the living and breeding environment of mold and bacteria, and thus, to perform a thorough mold and bacteria removal treatment on the inside of the indoor unit.

[0021] Further, in the control method of the air conditioning system of the present application, preferably, in the case where the phase determined in the phase determining step is the dewing phase, in the subsequent processing step, in the case where it is determined that the abnormality type does not affect the continuity of the cleaning mode, the air conditioning system is caused to continue or suspend the cleaning mode, and on the other hand, in the case where it is determined that the abnormality type affects the continuity of the cleaning mode, the air conditioning system is caused to stop the cleaning mode.

[0022] According to the control method of the air conditioning system of the present application, in the case where the phase determined in the phase determining step is the dewing phase, it is easier to avoid the air conditioning system from malfunctioning due to switching multiple times when it is not necessary to switch, to ensure the safety of the system, and it is easier to prevent the air conditioning system from switching when it is not necessary to switch, resulting in the continuity of the cleaning mode being broken, and the air conditioning system can be stopped in time when it is necessary to stop, to ensure the effectiveness of the cleaning mode, to prevent the system from doing useless work, and to achieve energy saving.

[0023] Further, in the control method of the air conditioning system of the present application, preferably, in the subsequent processing step, in the case where the time required for elimination of the abnormality type T1 is less than the preset time Tpd, it is determined that the abnormality type does not affect the continuity of the cleaning mode, and on the other hand, in the case where the time required for elimination T1 is the preset time Tpd or more, it is determined that the abnormality type affects the continuity of the cleaning mode.

[0024] According to the control method of the air conditioning system of the present application, as described above, even if the abnormality type is similar to thermo-off and shutdown, as long as the time required for elimination T1 is less than the preset time Tpd, it is considered that the abnormality type does not affect the continuity of the cleaning mode, and the air conditioning system is caused to continue the cleaning operation, and thus the continuity of the cleaning operation can be further ensured.

[0025] Further, in the control method of the air conditioning system of the present application, preferably, in the case where the air conditioning system is caused to suspend the cleaning mode in the subsequent processing step, after the abnormality is eliminated, whether to restart or continue the second cleaning mode is determined according to the operation time of the dewing phase or the humidity inside the indoor unit.

[0026] Here, the so-called "restart" means that the second cleaning mode is performed again, for example, the fixed time of the dewing phase is 20 minutes, and the dewing is suspended for 2 minutes due to an abnormality, and after the abnormality is eliminated, the dewing of 20 minutes is performed again to start the second cleaning mode from the beginning, which is different from the continued operation in which the dewing is performed for the remaining time (i.e., 18 minutes) to continue the second cleaning mode.

[0027] The control method of the air conditioning system according to the present application judges whether to restart the second cleaning mode according to the operation time length of the dewing stage or the humidity inside the indoor unit, so that thorough mildew-proof and sterilization treatment can be performed on the interior of the indoor unit.

[0028] In addition, in the control method of the air conditioning system according to the present application, preferably, the air conditioning system comprises a plurality of indoor units, in the case where the cleaning mode is simultaneously performed on two or more indoor units, if part of the indoor units has an abnormality, the remaining indoor units have no abnormality or although having an abnormality, the abnormality type is judged to not affect the continuity of the cleaning mode, the remaining indoor units are allowed to continue to keep the cleaning mode.

[0029] The control method of the air conditioning system according to the present application can ensure that the indoor unit in normal operation can be subjected to thorough mildew-proof and sterilization treatment.

[0030] In addition, in order to achieve the above object, the present application provides an air conditioning system comprising: an outdoor unit and an indoor unit forming a refrigerant circuit with the outdoor unit; and a control unit for controlling the operation of the air conditioning system, wherein the control unit controls the operation of the air conditioning system according to the above-mentioned control method of the air conditioning system.

[0031] (EFFECTS OF THE INVENTION)

[0032] According to the present application, the control method of the air conditioning system comprises: an abnormality information acquisition step of acquiring abnormality information in the process of performing the cleaning mode by the air conditioning system; an abnormality information judgment step of judging the abnormality type according to the abnormality information acquired in the abnormality information acquisition step; a stage judgment step of judging the stage in which the cleaning mode is located; and a subsequent treatment step of determining whether to stop or pause the cleaning mode according to the abnormality type determined in the abnormality information judgment step and the stage in which the cleaning mode is located determined in the stage judgment step. Therefore, it is easy to avoid the air conditioning system from malfunctioning due to multiple switching without the need for switching such as stopping operation, to ensure the safety of the system, and to prevent the air conditioning system from being switched without the need for switching such as stopping operation, which leads to the continuity of the cleaning mode being destroyed, and to make the air conditioning system stop in time when needed, to ensure the effectiveness of the cleaning mode, to prevent the system from doing useless work, and to achieve energy saving. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a schematic diagram of a refrigerant circuit of an air conditioning system according to an embodiment of the present application.

[0034] Figure 2 is a flow chart of an abnormality treatment of an air conditioning system according to an embodiment of the present application.

[0035] (Explanation of Symbols)

[0036] 1 Air conditioning system

[0037] 100 Outdoor unit

[0038] 101 Compressor

[0039] 102 Four-way valve

[0040] 103 Outdoor heat exchanger

[0041] 104 Outdoor fan

[0042] 105 Outdoor expansion valve

[0043] 106 Accumulator

[0044] 200 Indoor unit

[0045] 201 Indoor heat exchanger

[0046] 202 Indoor fan

[0047] 203 Indoor expansion valve

[0048] 300 Control unit

[0049] 401, 402 Connection pipe DETAILED DESCRIPTION

[0050] Hereinafter, an air conditioning system according to an embodiment of the present application will be described with reference to the accompanying drawings. Figure 1 and Figure 2 The air conditioning system according to the embodiment of the present application will be described, wherein Figure 1 is a schematic view showing a refrigerant circuit of the air conditioning system according to the embodiment of the present application, Figure 2 is a flowchart showing an abnormality process of the air conditioning system according to the embodiment of the present application.

[0051] (Structure of air conditioning system)

[0052] As shown in Figure 1 , the air conditioning system 1 according to the embodiment includes an outdoor unit 100 and an indoor unit 200 which form a refrigerant circuit with the outdoor unit 100, and a control unit 300 which controls the operation of the air conditioning system 1.

[0053] Here, the outdoor unit 100 is connected to the indoor unit 200 through the communication pipes 401, 402, thereby forming a refrigerant circuit. Also, in the outdoor unit 100, a compressor 101 that discharges refrigerant after pressurizing the same, a four-way valve 102 that controls the flow direction of the refrigerant in the refrigerant circuit, an outdoor heat exchanger 103 that functions as a condenser or an evaporator of the refrigerant, an outdoor fan 104 that blows air to the outdoor heat exchanger 103, an outdoor adjusting valve 105 that adjusts the pressure, flow rate, and the like of the refrigerant flowing therethrough, and a reservoir 106 that absorbs liquid components contained in the refrigerant returned to the compressor 101 are provided. Also, in the indoor unit 200, an indoor heat exchanger 201 that functions as a condenser or an evaporator of the refrigerant, an indoor fan 202 that blows air to the indoor heat exchanger 201, and an indoor adjusting valve 203 that adjusts the pressure, flow rate, and the like of the refrigerant flowing therethrough are provided. Also, the control unit 300 can be provided in the indoor unit 200 or independently of the indoor unit 200.

[0054] (Operations of the air conditioning system)

[0055] The operation modes of the air conditioning system 1 of the present embodiment include a normal mode and a cleaning mode. The normal mode includes a cooling operation and a heating operation, and the cleaning mode is for cleaning the inside of the indoor unit 200 and includes a normal cleaning operation (i.e., a first cleaning mode) and a deep cleaning operation (i.e., a second cleaning mode).

[0056] (Cooling operation)

[0057] When the cooling operation is performed, the four-way valve 102 is switched to the state shown by the solid line in FIG. 2. Figure 1

[0058] In the above state, the refrigerant discharged from the compressor 101 in the outdoor unit 100 flows into the outdoor heat exchanger 103 through the four-way valve 102, exchanges heat with outdoor air blown by the outdoor fan 104 to be cooled (i.e., the outdoor heat exchanger 103 functions as a condenser), and then flows through the outdoor adjusting valve 105 and out of the outdoor unit 100.

[0059] The refrigerant that has flowed out of the outdoor unit 100 flows into the indoor unit 200 through the communication pipe 401, flows through the indoor adjusting valve 203, and flows into the indoor heat exchanger 201, exchanges heat with indoor air blown by the indoor fan 202 to cool the indoor air (i.e., the indoor heat exchanger 201 functions as an evaporator), and then flows out of the indoor unit 200. ​

[0060] The refrigerant flowing out of the indoor unit 200 flows into the storage tank 106 via the four-way valve 102, and then returns to the compressor 101.

[0061] <Heating operation>

[0062] When the cooling operation is performed, the four-way valve 102 is switched to Figure 1 the state shown by the dotted line.

[0063] In the above state, the refrigerant, which is injected after being pressurized by the compressor 101 in the outdoor unit 100, flows through the four-way valve 102, and then flows out of the outdoor unit 100.

[0064] The refrigerant flowing out of the outdoor unit 100 flows into the indoor unit 200 via the communication pipe 402, and flows into the indoor heat exchanger 201, where it exchanges heat with indoor air sent by the indoor fan 202 to heat the indoor air (i.e., the indoor heat exchanger 201 functions as a condenser), and then flows through the indoor regulating valve 203 and flows out of the indoor unit 200.

[0065] The refrigerant flowing out of the indoor unit 200 flows into the outdoor unit 100 via the communication pipe 401, and flows through the outdoor regulating valve 105 to flow into the outdoor heat exchanger 103, where it exchanges heat with outdoor air sent by the outdoor fan 104 to be heated (i.e., the outdoor heat exchanger 103 functions as an evaporator), and then flows into the storage tank 106 via the four-way valve 102, and finally returns to the compressor 101.

[0066] <Normal cleaning operation>

[0067] The normal cleaning operation (i.e., the first cleaning mode) includes a frosting stage, a defrosting stage, and a drying stage, which are performed in sequence, wherein in the frosting stage, the air conditioning system 1 performs a cooling operation in which the indoor heat exchanger 201 functions as an evaporator, in the defrosting stage, the air conditioning system 1 performs a heating operation in which the indoor heat exchanger 201 functions as a condenser, and can also perform a blowing operation in which the indoor fan 202 sends air to the indoor heat exchanger 201, and in the drying stage, the air conditioning system 1 performs a blowing operation in which the indoor fan 202 sends air to the indoor heat exchanger 201, and can also perform a heating operation in which the indoor heat exchanger 201 functions as a condenser, thereby cleaning the indoor heat exchanger 201 and achieving drying of the interior of the indoor unit.

[0068] <Deep cleaning operation>

[0069] The deep cleaning operation (i.e., the second cleaning mode) includes a condensation stage, a stop stage, an air supply stage, and a heating stage, executed sequentially. During the condensation stage, the air conditioning system 1 operates in cooling mode, using the indoor heat exchanger 201 as an evaporator. During the air supply stage, the air conditioning system 1 operates in air supply mode, with the indoor fan 202 blowing air into the indoor heat exchanger 201. During the heating stage, the air conditioning system 1 operates in heating mode, using the indoor heat exchanger 201 as a condenser. Furthermore, during the condensation stage, the secondary side of the indoor heat exchanger 201 is humidified through cooling operation. During the stop stage, the compressor 101 stops, and the primary side of the indoor heat exchanger 201 is humidified. Conversely, during the air supply stage, a first dehumidification is achieved through air supply operation, and during the heating stage, a second dehumidification is achieved through heating operation. Thus, within a set time, the relative humidity inside the indoor unit is reduced to a certain level, ensuring the indoor unit is dry and inhibiting the growth and reproduction of mold and bacteria.

[0070] (Main characteristics of air conditioning systems)

[0071] In the air conditioning system 1 of this embodiment, the following is performed: Figure 2 The abnormality handling shown includes: an abnormality information acquisition step ST1, in which the control unit 300 acquires abnormality information during the execution of the cleaning mode in the air conditioning system 1; an abnormality information judgment step ST2, in which the control unit 300 judges the abnormality type based on the abnormality information acquired in the abnormality information acquisition step ST1; a stage judgment step ST3, in which the control unit 300 judges the stage in which the cleaning mode is located; and a subsequent processing step ST4, in which the control unit 300 determines whether to stop or pause the cleaning mode based on the abnormality type determined in the abnormality information judgment step ST2 and the stage in which the cleaning mode is located determined in the stage judgment step ST3.

[0072] Furthermore, in subsequent processing step ST4, if the abnormal type does not affect the continuity of the cleaning mode, the control unit 300 causes the air conditioning system 1 to continue executing the cleaning mode; on the other hand, if the abnormal type affects the continuity of the cleaning mode, the control unit 300 causes the air conditioning system 1 to stop or suspend the execution of the cleaning mode.

[0073] Here, anomalies that do not affect the continuity of the cleaning mode include alarms and displaying fault codes, while anomalies that affect the continuity of the cleaning mode include thermal shutdown and shutdown.

[0074] For example, as shown in Table 1 below, in the case where the air conditioning system 1 executes the first cleaning mode, if the control unit 300 judges that the abnormality type is a hot shutdown in the abnormality information judging step ST2, and judges that the stage in which the cleaning mode is located is the frost formation stage in the stage judging step ST3, the cleaning mode is suspended (at this time, the air conditioning system 1 executes the refrigeration operation, and the effect of suspending the cleaning mode on the cleaning mode is small, and after the trouble is eliminated, the refrigeration operation can be continued or restarted). In contrast, as shown in Table 1 below, in the case where the air conditioning system 1 executes the first cleaning mode, if the control unit 300 judges that the abnormality type is a hot shutdown in the abnormality information judging step ST2, and judges that the stage in which the cleaning mode is located is the defrosting stage or the drying stage in the stage judging step ST3, the cleaning mode is stopped.

[0075] On the other hand, as shown in Table 2 below, in the case where the air conditioning system 1 executes the second cleaning mode, if the control unit 300 judges that the abnormality type is a hot shutdown in the abnormality information judging step ST2, and judges that the stage in which the cleaning mode is located is one of the dew formation stage and the stop stage in the stage judging step ST3, the cleaning mode is suspended (at this time, the air conditioning system 1 humidifies the inside of the indoor unit through the dew formation stage and the stop stage, and the effect of suspending the cleaning mode on the cleaning mode is small, and after the trouble is eliminated, the second cleaning mode can be continued when it is ensured that the relative humidity inside the indoor unit satisfies the set condition). In contrast, as shown in Table 2 below, in the case where the air conditioning system 1 executes the second cleaning mode, if the control unit 300 judges that the abnormality type is a hot shutdown in the abnormality information judging step ST2, and judges that the stage in which the cleaning mode is located is one of the air supply stage and the heating stage in the stage judging step ST3, the cleaning mode is stopped (the air supply stage and the heating stage dehumidify the inside of the indoor unit by cooperation of the temperature and the humidity inside the indoor unit, and since it is necessary to reduce the relative humidity inside the indoor unit to a certain degree within a set time, the cleaning effect is affected by the occurrence of an abnormality in these two stages; that is, if an abnormality occurs in the air supply stage and the heating stage which affects the continuity of the mode, for example, the indoor unit or the air conditioning system is suspended for a certain period of time, after the trouble is eliminated, the relative humidity inside the indoor unit has changed, and the requirement that the relative humidity inside the indoor unit is reduced to a certain degree within a set time cannot be satisfied, and thus the second cleaning mode cannot be continued after the trouble is eliminated).

[0076] Table 1 (corresponding to the first cleaning mode)

[0077]

[0078] Table 2 (corresponding to the second cleaning mode)

[0079]

[0080] And, in the case that the air conditioning system 1 executes the first cleaning mode, if the air conditioning system 1 is suspended from executing the cleaning mode in the subsequent processing step ST4 due to an abnormality in the frosting stage, after the abnormality is eliminated, the control unit 300 determines whether to restart the first cleaning mode according to the running time length of the frosting stage or the humidity inside the indoor unit. On the other hand, in the case that the air conditioning system 1 executes the second cleaning mode, if the air conditioning system 1 is suspended from executing the cleaning mode in the subsequent processing step ST4 due to an abnormality in the dewing stage, after the abnormality is eliminated, the control unit 300 determines whether to restart or continue the second cleaning mode according to the running time length of the dewing stage or the humidity inside the indoor unit. For example, the fixed time length of the frosting or dewing stage is 20 minutes, the abnormality suspension is 2 minutes, after the abnormality is eliminated, the frosting or dewing of 20 minutes is performed again, or the frosting or dewing is performed for the remaining time length (i.e. 18 minutes).

[0081] In addition, the abnormality type whose elimination required time length T1 is less than the preset time length Tpd can also be regarded as the abnormality type that does not affect the continuity of the cleaning mode. That is, it can also be that, in the subsequent processing step ST4, in the case that the elimination required time length T1 of the abnormality type is less than the preset time length Tpd, the control unit 300 determines that the abnormality type does not affect the continuity of the cleaning mode, and on the other hand, in the case that the elimination required time length T1 is the preset time length Tpd or above, the control unit 300 determines that the abnormality type affects the continuity of the cleaning mode. For example, in the case that the air conditioning system 1 executes the second cleaning mode, if the indoor heat exchanger 201 is continuously below -2℃ for 2 minutes due to an abnormality in the dewing stage, the control unit 300 determines that the abnormality type does not affect the continuity of the cleaning mode, and continues the cleaning operation after the temperature rises; on the contrary, in the case that the air conditioning system 1 executes the second cleaning mode, if the indoor heat exchanger 201 is continuously below -5℃ for 10 minutes due to an abnormality in the dewing stage, the control unit 300 determines that the abnormality type affects the continuity of the cleaning mode, and suspends the cleaning operation (here, in order to prevent the indoor heat exchanger from freezing).

[0082] (Main technical effects of the present embodiment)

[0083] According to the air conditioning system 1 of the embodiment, the abnormality processing is performed, which includes: an abnormality information acquisition step ST1, in which the control unit 300 acquires abnormality information in the process of executing the cleaning mode by the air conditioning system 1; an abnormality information judgment step ST2, in which the control unit 300 judges the abnormality type according to the abnormality information acquired in the abnormality information acquisition step ST1; a stage judgment step ST3, in which the control unit 300 judges the stage in which the cleaning mode is located; and a subsequent processing step ST4, in which the control unit 300 judges whether to stop or pause the cleaning mode according to the abnormality type determined in the abnormality information judgment step ST2 and the stage in which the cleaning mode is located determined in the stage judgment step ST3. Therefore, it is easy to avoid the air conditioning system 1 from malfunctioning due to the switching multiple times without the need of switching such as stopping operation, ensure the safety of the system, and it is easy to prevent the air conditioning system 1 from being switched without the need of switching such as stopping operation, which leads to the continuity of the cleaning mode being destroyed, and the air conditioning system 1 can be stopped in time when needed, ensure the effectiveness of the cleaning mode, prevent the system from doing useless work, and achieve energy saving.

[0084] The present application has been described above with reference to the drawings; obviously, the specific implementation of the present application is not limited to the above-described embodiments.

[0085] For example, in the above-described embodiments, the air conditioning system 1 only includes one indoor unit 200, but is not limited thereto, and the air conditioning system can also include multiple indoor units. In this case, preferably, in the case that the cleaning mode is executed by two or more indoor units at the same time, 1) if the outdoor unit is abnormal and affects the continuity of the cleaning mode, the air conditioning system is stopped, and each indoor unit stops executing the cleaning mode; 2) if the outdoor unit is normal, part of the indoor units are abnormal and affect the continuity of the cleaning mode, and the remaining indoor units are not abnormal or are abnormal but the abnormality type does not affect the continuity of the cleaning mode, the part of the indoor units are stopped from executing the cleaning mode, and the remaining indoor units continue to maintain the cleaning mode; 3) if the outdoor unit and the indoor unit are both normal, and the environment temperature of part of the indoor units is abnormal (for example, the environment temperature in the heating stage is greater than 36℃), the part of the indoor units are stopped from executing the cleaning mode, and the remaining indoor units continue to maintain the cleaning mode.

[0086] It should be understood that, within the scope of the present application, each part and step in the embodiments can be freely combined, or each part and step in the embodiments can be appropriately deformed or omitted.

Claims

1. A control method of an air conditioning system, the air conditioning system (1) including an outdoor unit (100) and an indoor unit (200) forming a refrigerant circuit with the outdoor unit, the air conditioning system having a cleaning mode including a plurality of stages for cleaning an interior of the indoor unit, characterized by, comprises: an abnormality information acquisition step (ST1) of acquiring abnormality information during execution of the cleaning mode by the air conditioning system; an abnormality information determination step (ST2) of determining an abnormality type based on the abnormality information acquired in the abnormality information acquisition step; a stage determination step (ST3) of determining a stage in which the cleaning mode is located; and a subsequent processing step (ST4) of determining whether to stop or suspend the cleaning mode based on the abnormality type determined in the abnormality information determination step and the stage in which the cleaning mode is located determined in the stage determination step, the cleaning mode includes a first cleaning mode, the first cleaning mode sequentially executes a frost formation stage, a defrosting stage, and a drying stage, in the subsequent processing step, the air conditioning system is caused to continue or suspend the cleaning mode in a case where it is determined that the abnormality type does not affect continuity of the cleaning mode, and on the other hand, the air conditioning system is caused to stop execution of the cleaning mode in a case where it is determined that the abnormality type affects continuity of the cleaning mode.

2. The control method of an air conditioning system according to claim 1, wherein in the subsequent processing step, it is determined that the abnormality type does not affect continuity of the cleaning mode in a case where a time length Tl required for elimination of the abnormality type is less than a predetermined time length Tpd, and on the other hand, it is determined that the abnormality type affects continuity of the cleaning mode in a case where the time length Tl required for elimination is Tpd or more.

3. The control method of an air conditioning system according to claim 1, wherein in a case where the air conditioning system is caused to suspend execution of the cleaning mode in the subsequent processing step, whether to restart the first cleaning mode is determined based on a running time length of the frost formation stage or a humidity inside the indoor unit after elimination of the abnormality.

4. The control method of an air conditioning system according to claim 1, wherein the air conditioning system includes a plurality of the indoor units, in a case where two or more of the indoor units execute the cleaning mode at the same time, if some of the indoor units have an abnormality, the remaining indoor units are caused to continue to maintain the cleaning mode without having an abnormality or even though having an abnormality, it is determined that the abnormality type does not affect continuity of the cleaning mode. comprises:

5. A control method of an air conditioning system, the air conditioning system (1) including an outdoor unit (100) and an indoor unit (200) that forms a refrigerant circuit with the outdoor unit, the air conditioning system having a cleaning mode including a plurality of stages that cleans an interior of the indoor unit, characterized by, an abnormality information acquisition step (ST1) of acquiring abnormality information during execution of the cleaning mode by the air conditioning system; an abnormality information determination step (ST2) of determining an abnormality type based on the abnormality information acquired in the abnormality information acquisition step; a stage determination step (ST3) of determining a stage in which the cleaning mode is located; and a subsequent processing step (ST4) of determining whether to stop or suspend the cleaning mode based on the abnormality type determined in the abnormality information determination step and the stage in which the cleaning mode is located determined in the stage determination step, the cleaning mode includes a second cleaning mode, the second cleaning mode sequentially executes a frost formation stage, a defrosting stage, and a drying stage, ​ the second cleaning mode sequentially executes a dewing stage, a stopping stage, a blowing stage, and a heating stage, in the case where the stage determined in the stage determining step is the dewing stage, in the subsequent processing step, in the case where it is determined that the abnormality type does not affect the continuity of the cleaning mode, the air conditioning system is caused to continue or pause the execution of the cleaning mode, on the other hand, in the case where it is determined that the abnormality type affects the continuity of the cleaning mode, the air conditioning system is caused to stop the execution of the cleaning mode. 6.The control method of an air conditioning system according to claim 5, wherein in the subsequent processing step, in the case where the time required for the elimination of the abnormality type T1 is less than a preset time Tpd, it is determined that the abnormality type does not affect the continuity of the cleaning mode, on the other hand, in the case where the time required for the elimination T1 is the preset time Tpd or more, it is determined that the abnormality type affects the continuity of the cleaning mode. 7.The control method of an air conditioning system according to claim 5, wherein in the case where the air conditioning system is caused to pause the execution of the cleaning mode in the subsequent processing step, after the elimination of the abnormality, whether to restart or continue the second cleaning mode is determined according to the operation time of the dewing stage or the humidity inside the indoor unit. 8.The control method of an air conditioning system according to claim 5, wherein the air conditioning system includes a plurality of the indoor units, in the case where two or more of the indoor units execute the cleaning mode at the same time, if part of the indoor units have an abnormality, the remaining indoor units do not have an abnormality or although having an abnormality, it is determined that the abnormality type does not affect the continuity of the cleaning mode, the remaining indoor units are caused to continue to maintain the cleaning mode.

9. An air conditioning system (1) comprising: an outdoor unit (100) and an indoor unit (200) forming a refrigerant circuit with the outdoor unit; and a control unit (300) that controls the operation of the air conditioning system, characterized by the control unit controls the operation of the air conditioning system according to the control method of an air conditioning system according to any one of claims 1 to 8.

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