Air conditioning system, control method, control device and storage medium

Abstract

The invention discloses an air conditioning system, a control method, a control device and a storage medium. The air conditioning system comprises a four-way valve, a hot gas bypass branch and an evaporator pipe. After a refrigerant output by the compressor passes through the oil separator, one path of the refrigerant sequentially passes through the four-way valve, the condenser on the indoor side, the throttling element, the radiator of the IPM module and the evaporator on the outdoor side, and then enters the vapor-liquid separator through the four-way valve again; the other path enters the input end of a hot gas bypass branch, and then flows into a pipeline between the throttling element and a radiator of the IPM through an evaporator pipe at the lower part in the evaporator and the output end of the hot gas bypass branch; the liquid storage caused by the fact that the liquid refrigerant is directly introduced into the vapor-liquid separator can be effectively reduced, and the risk that the IPM module is condensed and the bottom of the evaporator is frozen can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and particularly to an air conditioning system, a control method, a control device and a storage medium. Background Art

[0002] Currently, in the heating condition, in order to alleviate the problem that the lower part of the evaporator is prone to frosting and icing, an air conditioning system diverts a branch from the high-pressure side and leads it into the reserved evaporator pipe at the very bottom of the evaporator, as Figure 1 and Figure 2 shown, and is provided with a hot gas bypass valve. The high-temperature and high-pressure gas condenses into a medium-temperature and medium-pressure refrigerant at the bottom of the evaporator and will pass through the hot gas bypass branch into the gas-liquid separator. At this time, the liquid refrigerant is very easy to be stored in the gas-liquid separator, causing the gas-liquid separator to accumulate refrigerant, thereby reducing the amount of refrigerant circulating in the system and affecting the heating effect of the air conditioning system.

[0003] Currently, the cooling of the IPM module mainly relies on the refrigerant passing through the throttling element from the indoor unit and then leading it into the IPM heat dissipation module. If due to system reasons, such as lack of refrigerant, etc., it is easy to cause the temperature of the refrigerant passing through the throttling element to be lower than the dew point temperature, which will cause the module to condense after leading it into the IPM heat dissipation module. If the dew drops on the main board, it is easy to cause serious consequences such as corrosion and damage of the main board. Summary of the Invention

[0004] In order to solve the deficiencies existing in the prior art, the present invention provides an air conditioning system, a control method, a control device and a storage medium.

[0005] The present invention adopts the following technical solutions:

[0006] In the first aspect of the present application, an air conditioning system is provided, including: a four-way valve, a hot gas bypass branch and an evaporator pipe; the refrigerant output by the compressor passes through an oil separator and then one path sequentially passes through the four-way valve, the condenser on the indoor side, the throttling element, the radiator of the IPM module, the outdoor evaporator, and then enters the gas-liquid separator through the four-way valve again; the other path enters the input end of the hot gas bypass branch, then passes through the evaporator pipe below the interior of the evaporator, and the output end of the hot gas bypass branch flows into the pipeline between the throttling element and the radiator of the IPM module.

[0007] According to the described air conditioning system, the air conditioning system further includes a hot gas bypass valve, which is arranged on one side of the input end of the hot gas bypass branch and is used to control the on-off of the hot gas bypass branch.

[0008] According to the described air - conditioning system, a temperature - sensing bulb of the throttling element is also provided on the output side of the throttling element to obtain the temperature sensed by the throttling element; a defrosting temperature - sensing bulb is provided on the bottom side inside the evaporator to obtain the defrosting sensed temperature; an IPM temperature sensor is provided on the IPM module to obtain the IPM temperature; based on the comparison of the temperature sensed by the throttling element, the defrosting sensed temperature, the IPM module temperature with their respective preset temperatures, the opening and closing of the hot - gas bypass valve are controlled.

[0009] In the second aspect of the present application, a method for controlling an air - conditioning system is provided. Based on the above - described air - conditioning system, the method includes the following steps: obtaining the ambient temperature Te; determining the current heating state of the air - conditioning system load based on the ambient temperature Te and a preset temperature threshold set in advance; controlling the opening and closing of the hot - gas bypass valve based on the heating state of the air - conditioning system load.

[0010] According to the described method for controlling an air - conditioning system, a first preset temperature threshold T1 and a second preset temperature threshold T2 are set; based on the comparison of the first preset temperature threshold T1, the second preset temperature threshold T2 with the ambient temperature Te, the current heating state of the air - conditioning system load is determined; when the ambient temperature Te is greater than or equal to the first preset temperature threshold T1, the air - conditioning system is in a high - load heating state; when the ambient temperature Te is greater than the second preset temperature threshold T2 and less than the first preset temperature threshold T1, the air - conditioning system is in a general - load heating state; when the ambient temperature Te is less than or equal to the second preset temperature threshold T2, the air - conditioning system is in a low - load heating state.

[0011] According to the described method for controlling an air - conditioning system, the temperature Tj sensed by the throttling element, the defrosting sensed temperature Th, and the IPM module temperature Ti are obtained; a third preset temperature threshold T3, a fourth preset temperature threshold T4, and a fifth preset temperature threshold T5 are set; based on the comparison of the temperature Tj sensed by the throttling element with the third preset temperature threshold T3, the comparison of the defrosting sensed temperature Th with the fourth preset temperature threshold T4, and the comparison of the IPM module temperature Ti with the fifth preset temperature threshold T5, it is determined whether the hot - gas bypass valve needs to be opened or closed.

[0012] According to the described method for controlling an air - conditioning system, when the air - conditioning system is in a high - load heating state, it is determined whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3 to control the opening of the hot - gas bypass valve; after the hot - gas bypass valve is opened, it is determined whether the IPM module temperature Ti is greater than the fourth preset temperature threshold T4 to control the closing of the hot - gas bypass valve.

[0013] According to the described air-conditioning system control method, when the temperature Tj sensed by the throttling element is not less than the third preset temperature threshold T3, it is continuously judged whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3; when the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, the hot gas bypass valve is opened; when the temperature Ti of the IPM module is not greater than the fourth preset temperature threshold T4, it is continuously judged whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4; when the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4, the hot gas bypass valve is closed.

[0014] According to the described air-conditioning system control method, when the air-conditioning system is in the general load heating state, it is judged whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5, for controlling the opening of the hot gas bypass valve; after the hot gas bypass valve is opened, it is judged whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5, for controlling the closing of the hot gas bypass valve.

[0015] According to the described air-conditioning system control method, when the temperature Tj sensed by the throttling element is not less than the third preset temperature threshold T3 and the defrosting temperature Th is not less than the fifth preset temperature threshold T5, it is continuously judged whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5; when the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or the defrosting temperature Th is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened; when the temperature Ti of the IPM module is not greater than the fourth preset temperature threshold T4, or the defrosting temperature Th is not greater than the fifth preset temperature threshold T5, it is continuously judged whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5; when the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and the defrosting temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed.

[0016] According to the described air-conditioning system control method, when the air-conditioning system is in the low load heating state, it is judged whether the defrosting temperature Th is less than the fifth preset temperature threshold T5, for controlling the opening of the hot gas bypass valve; after the hot gas bypass valve is opened, it is judged whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5, for controlling the closing of the hot gas bypass valve.

[0017] According to the described air-conditioning system control method, when the defrosting temperature sensor temperature Th is not less than the fifth preset temperature threshold T5, it is cyclically determined whether the defrosting temperature sensor temperature Th is less than the fifth preset temperature threshold T5; when the defrosting temperature sensor temperature Th is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened; when the defrosting temperature sensor temperature Th is not greater than the fifth preset temperature threshold T5, it is cyclically determined whether the defrosting temperature sensor temperature Th is greater than the fifth preset temperature threshold T5; when the defrosting temperature sensor temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed.

[0018] In the third aspect of the present application, a control device based on the air-conditioning system control method is provided, including:

[0019] A signal acquisition module for acquiring the ambient temperature Te, the temperature sensor temperature Tj of the throttling element, the defrosting temperature sensor temperature Th, and the IPM module temperature Ti;

[0020] A load heating state determination module for determining the current load heating state of the air-conditioning system based on the ambient temperature Te and a preset temperature threshold set in advance;

[0021] A hot gas bypass valve opening and closing judgment module for judging whether the hot gas bypass valve needs to be opened or closed based on the comparison between the temperature sensor temperature Tj of the throttling element and the third preset temperature threshold T3, the comparison between the defrosting temperature sensor temperature Th and the fourth preset temperature threshold T4, the comparison between the IPM module temperature Ti and the fifth preset temperature threshold T5, and in combination with the current load heating state of the air-conditioning system;

[0022] A control module for controlling the opening and closing of the hot gas bypass valve.

[0023] In the fourth aspect of the present application, a storage medium is provided. The storage medium includes a stored program, wherein when the program runs, it controls the device where the storage medium is located to execute an air-conditioning system control method.

[0024] Compared with the prior art, the beneficial effects of the present invention at least include:

[0025] The present application designs an air-conditioning system. Without increasing costs, the high-temperature and high-pressure refrigerant flows through the evaporator tube from the input end of the hot gas bypass branch, and then flows into the pipeline between the throttling element and the radiator of the IPM module from the output end of the hot gas bypass branch. This can effectively reduce the liquid refrigerant directly flowing into the gas-liquid separator to cause liquid storage, and can also avoid the risks of IPM module condensation and ice formation at the bottom of the evaporator.

[0026] This application designs an air-conditioning system control method. Based on the comparison between the ambient temperature Te and a preset temperature threshold, the current heating state of the air-conditioning system load is determined. After determining the heating state of the air-conditioning system load, according to the comparison between the temperature Tj sensed by the throttling element and the third preset temperature threshold T3, the comparison between the defrosting temperature Th and the fourth preset temperature threshold T4, and the comparison between the IPM module temperature Ti and the fifth preset temperature threshold T5, it is judged whether the hot gas bypass valve needs to be opened or closed, so as to accurately and efficiently avoid the condensation of the IPM module and the icing at the bottom of the evaporator. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic diagram of the evaporator in the prior art;

[0029] Figure 2 Air-conditioning system diagram in the prior art;

[0030] Figure 3 Air-conditioning system diagram of this application;

[0031] Figure 4 Flowchart of an air-conditioning system control method of this application;

[0032] Figure 5 Flowchart for controlling the opening and closing of the hot gas bypass valve when the system of this application is in a high-load heating state;

[0033] Figure 6 Flowchart for controlling the opening and closing of the hot gas bypass valve when the system of this application is in a general-load heating state;

[0034] Figure 7 Flowchart for controlling the opening and closing of the hot gas bypass valve when the system of this application is in a low-load heating state;

[0035] Figure 8 Block diagram of a control device of this application;

[0036] Figure 9 Process diagram of the working principle of a preferred embodiment of this application;

[0037] Reference Numerals: 1, compressor; 2, defrost temperature sensor; 3, hot gas bypass valve; 4, hot gas bypass branch; 5, throttle element temperature sensor; 6, IPM module; 7, throttle element; 8, evaporator; 9, evaporator tube; 10, oil separator; 11, oil return valve; 12, vapor-liquid separator; 13, condenser; 14, four-way valve. Detailed Embodiment

[0038] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way limits the present disclosure, its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present disclosure without creative efforts belong to the scope of protection of the present disclosure.

[0039] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present disclosure.

[0040] At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0041] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification.

[0042] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0044] This application solves the problem of liquid accumulation caused by directly introducing liquid refrigerant into the vapor-liquid separator by changing the position of the hot gas bypass branch and providing a control method, and introduces the medium-temperature and medium-pressure refrigerant into the radiator of the IPM module to avoid the condensation problem of the IPM module.

[0045] The compressor compresses the low-temperature and low-pressure gaseous refrigerant to form a high-temperature and high-pressure gaseous refrigerant. The gaseous refrigerant is separated from the lubricating oil and the gaseous refrigerant carried out of the compressor by an oil separator. The lubricating oil returns to the compressor through an oil return valve, and the high-temperature and high-pressure gaseous refrigerant enters the condenser through a four-way valve. The condenser condenses the high-pressure gaseous refrigerant to form a high-pressure liquid refrigerant with a decreased temperature. The high-pressure liquid refrigerant becomes a low-temperature and low-pressure two-phase refrigerant after passing through a throttling element. The two-phase refrigerant enters the evaporator through an IPM heat dissipation module for endothermic evaporation and becomes a low-temperature and low-pressure gaseous refrigerant. The gaseous refrigerant passes through the four-way valve and enters the gas-liquid separator, and the separated gaseous refrigerant is introduced into the compressor to perform the above cycle again.

[0046] First Embodiment:

[0047] Regarding the liquid storage problem caused by directly introducing the liquid refrigerant into the gas-liquid separator in this application, and the technical problem of IPM module condensation after the IPM heat dissipation module due to the refrigerant temperature flowing out of the throttling element being lower than the dew point temperature, please refer to Figure 1 and Figure 3 , an embodiment of this application provides an air conditioning system.

[0048] The air conditioning system includes: a four-way valve 14, a hot gas bypass branch 4, and an evaporator tube 9;

[0049] The refrigerant output by the compressor 1 passes through an oil separator 10 and then passes through the four-way valve 14, the condenser 13 on the indoor side, the throttling element 7, the radiator of the IPM module 6, and the outdoor evaporator 8 in sequence, and then enters the gas-liquid separator 12 through the four-way valve 14 again; another path enters the input end of the hot gas bypass branch 4, then flows through the evaporator tube 9 below the interior of the evaporator 8 and the output end of the hot gas bypass branch 4 into the pipeline between the throttling element 7 and the radiator of the IPM module 6.

[0050] The air conditioning system further includes a hot gas bypass valve 3, which is arranged on one side of the input end of the hot gas bypass branch 4 and is used to control the on-off of the hot gas bypass branch.

[0051] A throttling element temperature sensing package 5 is further arranged on the output side of the throttling element 7 and is used to obtain the throttling element sensing temperature.

[0052] A defrosting temperature sensing package 2 is arranged on the inner bottom side of the evaporator 8 and is used to obtain the defrosting sensing temperature.

[0053] An IPM temperature sensor is arranged on the IPM module 6 and is used to obtain the IPM temperature;

[0054] Based on the comparison of the throttling element sensing temperature, the defrosting sensing temperature, the IPM module temperature with their respective preset temperatures, and the combination of the comparisons, the opening and closing of the hot gas bypass valve 3 are controlled.

[0055] An oil separator 10 and a compressor 1 are provided with an oil return valve 11 for guiding lubricating oil back to the compressor 1 and preventing refrigerant from flowing back.

[0056] When it is necessary to prevent condensation of the IPM module 6 and prevent icing of the evaporator 8, this branch is conducted through the hot gas bypass valve 3, and high-temperature and high-pressure refrigerant enters the evaporator tube 9 to prevent the evaporator 8 from icing and neutralize the temperature of the refrigerant flowing out of the throttling element 7, thereby avoiding the risk of condensation of the IPM module 6.

[0057] The hot gas bypass branch 4 leads into the heat dissipation tube of the IPM module 6, which can not only reduce the storage of liquid refrigerant in the gas-liquid separator 12, but also allow medium-temperature and medium-pressure refrigerant to be replenished into the heat dissipation tube of the IPM module 6, increasing the refrigerant pressure and temperature in the heat dissipation tube and preventing condensation of the IPM module.

[0058] Second Embodiment:

[0059] An embodiment of the present application discloses a control method for an air conditioning system. As Figure 4 shown, optionally, the method steps of this embodiment can be executed by a control device.

[0060] The control method includes:

[0061] Step 401, when the air conditioning system is in the heating operation state, obtain the ambient temperature Te;

[0062] The ambient temperature is the temperature of the outdoor environment, which can be detected by the ambient temperature sensor of the air conditioning system.

[0063] Step 402, based on the ambient temperature Te and a preset temperature threshold, determine the current heating state of the air conditioning system load;

[0064] Optionally, the above step 402 can determine the current heating state of the air conditioning system load by comparing the first preset temperature threshold T1 and the second preset temperature threshold T2 preset in advance, based on the comparison between the first preset temperature threshold T1, the second preset temperature threshold T2 and the ambient temperature Te;

[0065] For example, when the ambient temperature Te is greater than or equal to the first preset temperature threshold T1, the air conditioning system is in a high-load heating state;

[0066] When the ambient temperature Te is greater than the second preset temperature threshold T2 and the ambient temperature Te is less than the first preset temperature threshold T1, the air conditioning system is in a general-load heating state;

[0067] When the ambient temperature Te is less than or equal to the second preset temperature threshold T2, the air conditioning system is in a low-load heating state.

[0068] It should be noted that the above method is only an example and does not mean to limit the present disclosure thereto. Those skilled in the art can also use other implementable methods to determine the corresponding parameters.

[0069] Step 403: Based on the heating load state of the air-conditioning system, control the opening and closing of the hot gas bypass valve to prevent condensation of the IPM module and prevent icing of the evaporator.

[0070] When the air-conditioning system is in a high-load heating state, control the opening and closing of the hot gas bypass valve to control the prevention of condensation of the IPM module.

[0071] When the air-conditioning system is in a general-load heating state, control the opening and closing of the hot gas bypass valve to control the prevention of condensation of the IPM module and the prevention of icing of the evaporator.

[0072] When the air-conditioning system is in a low-load heating state, control the opening and closing of the hot gas bypass valve to control the prevention of icing of the evaporator.

[0073] Optionally, obtain the temperature Tj sensed by the throttling element, the temperature Th sensed during defrosting, and the temperature Ti of the IPM module; at the same time, set the third preset temperature threshold T3, the fourth preset temperature threshold T4, and the fifth preset temperature threshold T5.

[0074] Based on the comparison between the temperature Tj sensed by the throttling element and the third preset temperature threshold T3, the comparison between the temperature Th sensed during defrosting and the fourth preset temperature threshold T4, the comparison between the temperature Ti of the IPM module and the fifth preset temperature threshold T5, and the combination of the above comparison methods, determine whether the hot gas bypass valve needs to be opened or closed.

[0075] Optionally, the temperature Tj sensed by the throttling element is obtained through a throttling element temperature sensing package, and the temperature Th sensed during defrosting is obtained through a defrosting temperature sensing package.

[0076] Please refer to Figure 5 , when the air-conditioning system is in a high-load heating state, due to the large moisture content in the air, there is a greater risk of condensation of the IPM module at this time. Control the opening and closing of the hot gas bypass valve to control the prevention of condensation of the IPM module.

[0077] Step 501: Determine whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3 to control the opening of the hot gas bypass valve.

[0078] When the temperature Tj sensed by the throttling element is not less than the third preset temperature threshold T3, then repeatedly determine whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3.

[0079] When the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, the hot gas bypass valve is opened to supplement medium-temperature and medium-pressure refrigerant into the radiator of the IPM module, avoiding the risk of IPM condensation;

[0080] Step 502, after the hot gas bypass valve is opened, determine whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 to control the closing of the hot gas bypass valve;

[0081] When the temperature Ti of the IPM module is not greater than the fourth preset temperature threshold T4, continuously determine whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4;

[0082] When the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4, close the hot gas bypass valve and exit the IPM anti-condensation control.

[0083] Please refer to Figure 6 , when the air-conditioning system is in the general load heating state, there is both a risk of IPM module condensation and a possibility of evaporator frosting and icing. By controlling the opening and closing of the hot gas bypass valve, it is used to achieve the control of IPM module anti-condensation and evaporator anti-icing control;

[0084] Step 601, determine whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5 to control the opening of the hot gas bypass valve;

[0085] When the temperature Tj sensed by the throttling element is not less than the third preset temperature threshold T3 and the defrosting temperature Th is not less than the fifth preset temperature threshold T5, continuously determine whether the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5;

[0086] When the temperature Tj sensed by the throttling element is less than the third preset temperature threshold T3, or the defrosting temperature Th is less than the fifth preset temperature threshold T5, open the hot gas bypass valve to defrost the evaporator and supplement medium-temperature and medium-pressure refrigerant into the radiator of the IPM module, avoiding the condensation risk of the IPM module;

[0087] Step 602, after the hot gas bypass valve is opened, determine whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and the defrosting temperature Th is greater than the fifth preset temperature threshold T5 to control the closing of the hot gas bypass valve;

[0088] When the temperature Ti of the IPM module is not greater than the fourth preset temperature threshold T4, or the defrosting temperature Th is not greater than the fifth preset temperature threshold T5, it is continuously determined whether the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5;

[0089] When the temperature Ti of the IPM module is greater than the fourth preset temperature threshold T4 and the defrosting temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed, and the IPM anti-condensation control and the evaporator anti-icing control are exited.

[0090] Please refer to Figure 7 , when the air-conditioning system is in the low-load heating state, there is no risk of condensation in the IPM module at this time. At this time, it is only determined whether there is a possibility of frosting and icing on the evaporator. By controlling the opening and closing of the hot gas bypass valve, the evaporator anti-icing control is realized;

[0091] Step 701, determine whether the defrosting temperature Th is less than the fifth preset temperature threshold T5 to control the opening of the hot gas bypass valve;

[0092] When the defrosting temperature Th is not less than the fifth preset temperature threshold T5, it is continuously determined whether the defrosting temperature Th is less than the fifth preset temperature threshold T5;

[0093] When the defrosting temperature Th is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened to defrost the evaporator;

[0094] Step 702, after the hot gas bypass valve is opened, determine whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5 to control the closing of the hot gas bypass valve;

[0095] When the defrosting temperature Th is not greater than the fifth preset temperature threshold T5, it is continuously determined whether the defrosting temperature Th is greater than the fifth preset temperature threshold T5;

[0096] When the defrosting temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed, and the evaporator anti-icing control is exited.

[0097] Please refer to Figure 9 , Figure 9 is a working principle process diagram of a preferred embodiment of the present application;

[0098] The working principle:

[0099] When the air-conditioning system is in the heating operation state, the ambient temperature Te is detected by the ambient temperature sensor of the air-conditioning system. If Te≥T1, the air-conditioning system is in the high-load heating state. If T2<Te<T1, the air-conditioning system is in the general-load heating state. If Te≤T2, the air-conditioning system is in the low-load heating state;

[0100] If the air conditioning system is in a high-load heating state, due to the large moisture content in the air, there is a high risk of condensation in the IPM module at this time. If it is detected that the temperature Tj sensed by the throttling element is lower than the third preset temperature threshold T3, the hot gas bypass valve is opened at this time to supplement medium-temperature and medium-pressure refrigerant into the radiator of the IPM module to avoid the risk of IPM condensation. After the hot gas bypass valve is opened, if the temperature Ti of the IPM module is higher than the fourth preset temperature threshold T4, the anti-condensation control is exited and the hot gas bypass valve is closed.

[0101] If the air conditioning system is in a general-load heating state, there is both a risk of IPM module condensation and a possibility of evaporator frosting and icing at this time. If it is detected that the temperature Tj sensed by the throttling element is lower than the third preset temperature threshold T3 or the defrosting temperature Th sensed is lower than the fifth preset temperature threshold T5, the hot gas bypass valve is opened at this time to defrost the evaporator and supplement medium-temperature and medium-pressure refrigerant into the radiator of the IPM module to avoid the risk of IPM condensation. After the hot gas bypass valve is opened, if the defrosting temperature Th is higher than the fifth preset temperature threshold T5 and the temperature Ti of the IPM module is higher than the fourth preset temperature threshold T4, the anti-condensation control is exited and the hot gas bypass valve is closed.

[0102] If the air conditioning system is in a low-load heating state, there is no risk of condensation in the IPM module at this time. At this time, only the possibility of evaporator frosting and icing is judged. If the defrosting temperature Th is lower than the fifth preset temperature threshold T5, the hot gas bypass valve is opened at this time to defrost the evaporator. After the hot gas bypass valve is opened, if the defrosting temperature Th is higher than the fifth preset temperature threshold T5, the anti-icing control is exited and the hot gas bypass valve is closed.

[0103] Third Embodiment:

[0104] Please refer to Figure 8 This application also provides a control device based on the air conditioning system control method, including: a signal acquisition module 801, a load heating state determination module 802, a hot gas bypass valve opening and closing judgment module 803, and a control module 804;

[0105] The signal acquisition module 801 is used to obtain the ambient temperature Te, the temperature Tj sensed by the throttling element, the defrosting temperature Th, and the temperature Ti of the IPM module;

[0106] The load heating state determination module 802 is used to determine the current load heating state of the air conditioning system based on the ambient temperature Te and the preset temperature threshold set in advance;

[0107] The hot gas bypass valve opening / closing judgment module 803 is configured to judge whether the hot gas bypass valve needs to be opened or closed based on the comparison between the temperature Tj sensed by the throttling element and the third preset temperature threshold T3, the comparison between the defrosting temperature Th and the fourth preset temperature threshold T4, the comparison between the IPM module temperature Ti and the fifth preset temperature threshold T5, and the combination of the above comparison methods, and in combination with the current heating state of the air conditioning system load;

[0108] The control module 804 is configured to control the opening and closing of the hot gas bypass valve.

[0109] Fourth Embodiment:

[0110] The present invention also provides a storage medium storing a computer program, which when executed by a processor implements an air conditioning system control method disclosed by the present invention.

[0111] The storage medium can be a tangible device that can hold and store instructions used by an instruction execution device. The storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the above. More specific examples (non-exhaustive list) of the storage medium include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punched card or raised structures in a groove storing instructions thereon, and any suitable combination of the above. The storage medium used herein is not construed as an instantaneous signal itself, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagated through a waveguide or other transmission medium (e.g., optical pulses through an optical fiber cable), or electrical signals transmitted through wires.

[0112] The computer-readable program instructions described herein can be downloaded from the storage medium to various computing / processing devices, or downloaded to an external computer or external storage device through a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, optical fiber transmissions, wireless transmissions, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in the storage medium in each computing / processing device.

[0113] Computer program instructions for performing the operations of the present disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages such as Smalltalk, C++, etc., and conventional procedural programming languages such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, executed as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider). In some embodiments, by using the state information of the computer-readable program instructions to customize an electronic circuit, such as a programmable logic circuit, a field-programmable gate array (FPGA), or a programmable logic array (PLA), the electronic circuit can execute the computer-readable program instructions to implement various aspects of the present disclosure.

[0114] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. An air conditioning system, characterized in that: include: Four-way valve, hot gas bypass branch and evaporator pipe; The refrigerant output by the compressor passes through the oil separator, then passes through the four-way valve, the indoor condenser, the throttling element, the radiator of the IPM module, the outdoor evaporator, and then passes through the four-way valve again to enter the vapor-liquid separator; The other path enters the input end of the hot gas bypass branch, and then flows into the pipeline between the throttling element and the radiator of the IPM module through the evaporator tube at the bottom of the evaporator and the output end of the hot gas bypass branch.

2. An air conditioning system according to claim 1, characterized in that: The air conditioning system further comprises a hot gas bypass valve, which is arranged at one side of the input end of the hot gas bypass branch and is used to control the on-off of the hot gas bypass branch.

3. An air conditioning system according to claim 2, characterized in that: A throttling element temperature sensing package is also provided on the output side of the throttling element for obtaining the temperature of the throttling element; A defrost temperature sensing package is provided on the inner bottom side of the evaporator for obtaining the defrost temperature sensing temperature; An IPM temperature sensor is provided on the IPM module to obtain the IPM temperature; The opening and closing of the hot gas bypass valve is controlled based on the comparison between the throttling element sensing temperature, the defrosting sensing temperature, the IPM module temperature and their respective preset temperatures.

4. An air conditioning system control method, based on the air conditioning system according to claim 3, characterized in that: The following steps are involved: Get the ambient temperature Te; Based on the ambient temperature Te and a preset temperature threshold, determine the current air conditioning system load heating state; Based on the heating load status of the air conditioning system, the opening and closing of the hot gas bypass valve is controlled.

5. The air conditioning system control method according to claim 4, characterized in that: Setting a first preset temperature threshold T1 and a second preset temperature threshold T2; Based on the comparison between the first preset temperature threshold T1, the second preset temperature threshold T2 and the ambient temperature Te, the current air conditioning system load heating state is determined; When the ambient temperature Te is greater than or equal to the first preset temperature threshold T1, the air conditioning system is in a high-load heating state; When the ambient temperature Te is greater than the second preset temperature threshold T2 and the ambient temperature Te is less than the first preset temperature threshold T1, the air conditioning system is in a general load heating state; When the ambient temperature Te is less than or equal to the second preset temperature threshold T2, the air-conditioning system is in a low-load heating state.

6. The air conditioning system control method according to claim 5, characterized in that: Obtain the throttling element temperature Tj, the defrosting temperature Th and the IPM module temperature Ti; Setting a third preset temperature threshold T3, a fourth preset temperature threshold T4 and a fifth preset temperature threshold T5; Based on the comparison between the throttling element temperature sensing temperature Tj and the third preset temperature threshold T3, the comparison between the defrost temperature sensing temperature Th and the fourth preset temperature threshold T4, and the comparison between the IPM module temperature Ti and the fifth preset temperature threshold T5, it is determined whether the hot gas bypass valve needs to be opened or closed.

7. The air conditioning system control method according to claim 6, characterized in that: When the air conditioning system is in a high-load heating state, it is determined whether the throttling element temperature Tj is less than a third preset temperature threshold T3, which is used to control the opening of the hot gas bypass valve; After the hot gas bypass valve is opened, it is determined whether the IPM module temperature Ti is greater than a fourth preset temperature threshold T4, which is used to control the closing of the hot gas bypass valve.

8. The air conditioning system control method according to claim 7, characterized in that: When the throttling element temperature Tj is not less than the third preset temperature threshold T3, it is cyclically determined whether the throttling element temperature Tj is less than the third preset temperature threshold T3; When the throttling element sensing temperature Tj is less than the third preset temperature threshold T3, the hot gas bypass valve is opened; When the IPM module temperature Ti is not greater than the fourth preset temperature threshold T4, it is cyclically determined whether the IPM module temperature Ti is greater than the fourth preset temperature threshold T4; When the IPM module temperature Ti is greater than the fourth preset temperature threshold T4, the hot gas bypass valve is closed.

9. The air conditioning system control method according to claim 6, characterized in that: When the air conditioning system is in the normal load heating state, it is determined whether the throttling element temperature Tj is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5, which is used to control the opening of the hot gas bypass valve; When the hot gas bypass valve is opened, it is determined whether the IPM module temperature Ti is greater than a fourth preset temperature threshold T4 and whether the defrost sensing temperature Th is greater than a fifth preset temperature threshold T5, so as to control the closing of the hot gas bypass valve.

10. The air conditioning system control method according to claim 9, characterized in that: When the throttling element temperature Tj is not less than the third preset temperature threshold T3 and the defrosting temperature Th is not less than the fifth preset temperature threshold T5, it is cyclically determined whether the throttling element temperature Tj is less than the third preset temperature threshold T3, or whether the defrosting temperature Th is less than the fifth preset temperature threshold T5; When the throttling element temperature Tj is less than the third preset temperature threshold T3, or the defrosting temperature Th is less than the fifth preset temperature threshold T5, the hot gas bypass valve is opened; When the IPM module temperature Ti is not greater than the fourth preset temperature threshold T4, or the defrost sensing temperature Th is not greater than the fifth preset temperature threshold T5, it is cyclically determined whether the IPM module temperature Ti is greater than the fourth preset temperature threshold T4 and the defrost sensing temperature Th is greater than the fifth preset temperature threshold T5; When the IPM module temperature Ti is greater than the fourth preset temperature threshold T4 and the defrost sensing temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed.

11. The air conditioning system control method according to claim 6, characterized in that: When the air conditioning system is in a low-load heating state, it is determined whether the defrost sensing temperature Th is less than a fifth preset temperature threshold T5, which is used to control the opening of the hot gas bypass valve; After the hot gas bypass valve is opened, it is determined whether the defrost sensing temperature Th is greater than a fifth preset temperature threshold T5, which is used to control the closing of the hot gas bypass valve.

12. The air conditioning system control method according to claim 11, characterized in that: When the defrost sensing temperature Th is not less than the fifth preset temperature threshold T5, it is cyclically determined whether the defrost sensing temperature Th is less than the fifth preset temperature threshold T5; When the defrost sensing temperature Th is lower than the fifth preset temperature threshold T5, the hot gas bypass valve is opened; When the defrost sensing temperature Th is not greater than the fifth preset temperature threshold T5, the cycle is cut off to determine whether the defrost sensing temperature Th is greater than the fifth preset temperature threshold T5; When the defrost sensing temperature Th is greater than the fifth preset temperature threshold T5, the hot gas bypass valve is closed.

13. A control device based on the air conditioning system control method according to any one of claims 4 to 12, characterized in that: include: Signal acquisition module, used to obtain the ambient temperature Te, the throttling element temperature Tj, the defrost temperature Th and the IPM module temperature Ti; A load heating state determination module is used to determine the current air conditioning system load heating state based on the ambient temperature Te and a preset temperature threshold; The hot gas bypass valve opening and closing judgment module is used to judge whether the hot gas bypass valve needs to be opened or closed based on the comparison between the throttling element temperature Tj and the third preset temperature threshold T3, the defrosting temperature Th and the fourth preset temperature threshold T4, the IPM module temperature Ti and the fifth preset temperature threshold T5, and the current air conditioning system load heating state; The control module is used to control the opening and closing of the hot gas bypass valve.

14. A storage medium, characterized in that: The storage medium includes a stored program, wherein when the program is executed, the device where the storage medium is located is controlled to execute an air conditioning system control method according to any one of claims 4 to 12.

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