Air conditioning system control method, program product, device and air conditioning system

Abstract

The invention discloses an air conditioning system control method, a program product, a device and an air conditioning system.The lower portion of an indoor heat exchanger in the air conditioning system is provided with a refrigerant concentration sensor, and the method comprises the steps that the refrigerant concentration detected by the refrigerant concentration sensor is obtained; if the refrigerant concentration is larger than or equal to a preset concentration threshold value, it is determined that the air conditioner system is in a current operation mode; and controlling the air conditioning system to execute a refrigerant leakage control action matched with the operation mode. According to the technical scheme, the safety of the air conditioning system can be improved.

Description

Technical Field

[0001] This application belongs to the field of air conditioning system control technology, and in particular relates to an air conditioning system control method, program product, device and air conditioning system. Background Technology

[0002] Currently, the refrigerant used in air conditioning systems does not damage the ozone layer, but it is denser than air and highly flammable and explosive. In some scenarios, such as when the air conditioning system is installed at a low height, if a refrigerant leak occurs, the leaked refrigerant will accumulate at the bottom of the room, and a high concentration could potentially cause combustion or explosion. Therefore, improving the safety of air conditioning systems is an urgent technical problem to be solved. Summary of the Invention

[0003] Embodiments of this application provide an air conditioning system control method, program product, device, and air conditioning system, thereby improving the safety of the air conditioning system.

[0004] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part by practice of this application.

[0005] According to a first aspect of the embodiments of this application, an air conditioning system control method is provided, wherein a refrigerant concentration sensor is installed below the indoor heat exchanger in the air conditioning system, the method comprising: acquiring a refrigerant concentration detected by the refrigerant concentration sensor; if the refrigerant concentration is greater than or equal to a preset concentration threshold, determining that the air conditioning system is in a current operating mode; and controlling the air conditioning system to perform a refrigerant leakage control action that matches the operating mode.

[0006] In some embodiments of this application, based on the foregoing scheme, if the operating mode is a cooling mode, controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode includes: controlling the opening degree of the throttling device in the air conditioning system to zero; and / or controlling the outdoor fan in the air conditioning system to operate at a first preset speed; and / or controlling the compressor in the air conditioning system to operate at a first preset frequency.

[0007] In some embodiments of this application, based on the foregoing scheme, if the operating mode is a heating mode, controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode includes: controlling the opening degree of the throttling device in the air conditioning system to a preset opening degree; after operating in the heating mode for a first preset time, controlling the air conditioning system to switch to cooling mode; in the cooling mode, controlling the opening degree of the throttling device in the air conditioning system to zero; and / or controlling the outdoor fan in the air conditioning system to operate at a second preset speed; and / or controlling the compressor in the air conditioning system to operate at a first preset frequency.

[0008] In some embodiments of this application, based on the foregoing scheme, the method further includes: after a second preset time of operation in cooling mode, or after a third preset time of detection that the low-pressure protection switch in the air conditioning system has been disconnected, controlling the outdoor fan and / or compressor in the air conditioning system to stop operating.

[0009] In some embodiments of this application, based on the foregoing scheme, after controlling the outdoor fan and / or compressor in the air conditioning system to stop operating, the method further includes: controlling the outdoor fan in the air conditioning system to operate at a third preset speed every fourth preset time interval; and / or controlling the compressor in the air conditioning system to operate at a second preset frequency; and controlling the outdoor fan and / or compressor in the air conditioning system to stop operating after the outdoor fan and / or compressor in the air conditioning system has been operating for a fifth preset time.

[0010] In some embodiments of this application, based on the foregoing scheme, before determining the current operating mode of the air conditioning system, the method further includes: controlling the indoor fan in the air conditioning system to operate at a fourth preset speed; controlling the orientation of the horizontal air guide plate of the indoor unit in the air conditioning system to be upward; and controlling the vertical air guide plate of the indoor unit in the air conditioning system to perform a left-right swaying motion.

[0011] In some embodiments of this application, based on the foregoing scheme, after controlling the air conditioning system to perform a refrigerant leakage control action matching the operating mode, the method further includes: if the refrigerant concentration is less than a preset concentration threshold, or after the air conditioning system has performed a refrigerant leakage control action matching the operating mode for a sixth preset time, controlling the indoor fan in the air conditioning system to stop operating.

[0012] Based on the technical solution proposed in this application, the refrigerant concentration detected by the refrigerant concentration sensor installed below the indoor heat exchanger in the air conditioning system is obtained. When the refrigerant concentration is greater than or equal to a preset concentration threshold, the air conditioning system is determined to be in the current operating mode, and the air conditioning system is controlled to perform a refrigerant leakage control action that matches the operating mode. This can prevent excessive refrigerant accumulation caused by refrigerant leakage from the indoor heat exchanger, thereby avoiding excessively high refrigerant concentration and improving the safety of the air conditioning system.

[0013] According to a second aspect of the embodiments of this application, a computer program product is provided, the computer program product including computer instructions stored in a computer-readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform the method as described in the first aspect of the embodiments of this application.

[0014] According to a third aspect of the present application, an air conditioning system control device is provided, the device including one or more processors and one or more memories, the one or more memories storing at least one piece of program code, the at least one piece of program code being loaded and executed by the one or more processors to implement the method as described in the first aspect of the present application.

[0015] According to a fourth aspect of the embodiments of this application, an air conditioning system is provided, the air conditioning system including an air conditioning system control device as described in the third aspect of the embodiments of this application.

[0016] The beneficial effects of the embodiments of the second to fourth aspects described above can be referred to the beneficial effects of the first aspect and the embodiments of the first aspect described above, and will not be repeated here.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0019] Figure 1 An air conditioning system architecture diagram is shown, in which the technical solutions of the embodiments of this application can be applied.

[0020] Figure 2 A flowchart of an air conditioning system control method according to an embodiment of this application is shown;

[0021] Figure 3 A detailed flowchart of the air conditioning system control method in an embodiment of this application is shown;

[0022] Figure 4 A schematic diagram of the structure of the air conditioning system control device in an embodiment of this application is shown. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0025] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0026] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0027] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0028] The technical solution proposed in this application can be applied to the safety control scenarios of air conditioning systems, such as the safety control scenarios of floor-mounted or suspended air conditioning systems. In order to enable those skilled in the art to better understand this application, the following will be combined with Figure 1 A brief explanation of the air conditioning system.

[0029] See Figure 1 The diagram illustrates an air conditioning system architecture that can be applied to the technical solutions of the embodiments of this application.

[0030] like Figure 1As shown, the air conditioning system involved in this application embodiment may include a gas-liquid separator 101, used to separate the liquid refrigerant from the refrigerant to be input into the compressor, the gaseous refrigerant returns to the compressor to continue compression and circulation, and the liquid refrigerant remains in the gas-liquid separator to prevent liquid slugging in the compressor; a compressor 102, used to compress and transport refrigerant; a four-way valve 103, used to switch between cooling mode and heating mode in the air conditioning system; an outdoor heat exchanger 104 (e.g., a condenser), used as a condenser end in cooling mode to dissipate heat from the refrigerant, and as an evaporator end in heating mode to absorb heat from the refrigerant; and an outdoor fan 105, used to drive the outdoor fan. Air passes through the outdoor heat exchanger, which enhances the absorption or release of heat; the throttling device 107 is used to reduce the pressure and temperature of the refrigerant in the air conditioning system; filters 106 and 108 are used to filter impurities in the air conditioning system to prevent them from entering the throttling device, which would reduce its effectiveness or cause it to become clogged; the indoor heat exchanger 110 (such as an evaporator) acts as the evaporator in cooling mode to absorb heat from the refrigerant, and as the condenser in heating mode to dissipate heat from the refrigerant; the indoor fan 109 drives indoor air through the indoor heat exchanger, enhancing the absorption or release of heat.

[0031] In this application, a refrigerant concentration sensor is also installed below the indoor heat exchanger 110 in the air conditioning system. Figure 1 The content does not reflect directional information and is used to detect the refrigerant concentration at the bottom of the indoor heat exchanger.

[0032] The following will continue based on Figure 1 The working principle of the air conditioning system described in this application in cooling mode is briefly explained as follows:

[0033] In cooling mode, the gas-liquid separator 101 separates the liquid portion of the refrigerant and delivers the gaseous refrigerant to the compressor 102. The compressor 102 compresses the low-temperature, low-pressure gaseous refrigerant to obtain a high-temperature, high-pressure gaseous refrigerant. The high-temperature, high-pressure gaseous refrigerant is then input into the outdoor heat exchanger 104 through the D and C ports of the four-way valve 103. Under the action of the outdoor fan 105, heat is efficiently released to the outside, resulting in a medium-temperature, high-pressure liquid refrigerant. After passing through the throttling device 107 (such as an electronic expansion valve), the medium-temperature, high-pressure liquid refrigerant becomes a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant is then input into the indoor heat exchanger 110. Under the action of the indoor fan 109, the refrigerant in the indoor heat exchanger 110 efficiently absorbs heat from the indoor air and evaporates into a low-temperature, low-pressure gaseous refrigerant. As the indoor air absorbs heat, its temperature drops, achieving a cooling effect. Finally, the gaseous refrigerant from the indoor heat exchanger 110 is delivered to the gas-liquid separator 101 through the E and S ports of the four-way valve 103, completing one cycle of the refrigerant in the air conditioning system.

[0034] The following will continue based on Figure 1 The working principle of the air conditioning system described in this application in heating mode is briefly explained as follows:

[0035] In heating mode, the gas-liquid separator 101 separates the liquid portion of the refrigerant and delivers the gaseous refrigerant to the compressor 102. The compressor 102 compresses the low-temperature, low-pressure gaseous refrigerant to obtain a high-temperature, high-pressure gaseous refrigerant. This high-temperature, high-pressure gaseous refrigerant then enters the indoor heat exchanger 110 through ports D and E of the four-way valve 103. Under the action of the indoor fan 109, heat is efficiently released into the room, resulting in a medium-temperature, high-pressure liquid refrigerant. The indoor air absorbs heat from the refrigerant, causing its temperature to rise, thus achieving a warming effect. After passing through the throttling device 107, the medium-temperature, high-pressure liquid refrigerant becomes a low-temperature, low-pressure liquid refrigerant. This low-temperature, low-pressure liquid refrigerant is then input into the outdoor heat exchanger 104. Under the action of the outdoor fan 105, the refrigerant in the outdoor heat exchanger 104 efficiently absorbs heat from the outdoor air and evaporates into a low-temperature, low-pressure gaseous refrigerant. Finally, the gaseous refrigerant from the outdoor heat exchanger 104 is delivered to the gas-liquid separator 101 through the C and S ports of the four-way valve 103, completing one cycle of the refrigerant in the air conditioning system.

[0036] In this application, it should also be noted that the air conditioning systems involved in this application currently largely use finned tube heat exchangers for their indoor heat exchangers. In some cases, the bending radius of the heat transfer tubes is less than 2.5 times the diameter of the heat transfer tube. At the bend, the tube wall is stretched, resulting in a thinner wall thickness and making leakage more likely. The other side of the heat transfer tube is usually formed by welding a semi-circular tube to create a loop. Compared to the bend side, the welded side is more prone to leakage due to issues such as incomplete welding, missed welds, pinholes, and overheating, posing a safety risk. Therefore, this application proposes an air conditioning system control method to improve the safety of the air conditioning system.

[0037] The implementation details of the technical solutions in the embodiments of this application are described in detail below:

[0038] Figure 2 A flowchart of an air conditioning system control method according to an embodiment of this application is shown. The air conditioning system control method can be executed by a device with computing processing capabilities, such as an air conditioning system control device. (Refer to...) Figure 2 As shown, the air conditioning system control method includes at least steps 210 to 230, which are described in detail below:

[0039] In step 210, the refrigerant concentration detected by the refrigerant concentration sensor is obtained.

[0040] In this application, a refrigerant concentration sensor can be installed below the indoor heat exchanger in the air conditioning system. Specifically, in the air conditioning system involved in this application, when floor-mounted, because the refrigerant density is greater than the air density, refrigerant leaking when the indoor fan is not turned on flows towards the base of the air conditioning system due to gravity. When flammable refrigerant leaks from the indoor heat exchanger, it tends to accumulate within 0.6m of the ground. Therefore, the smaller the height of the refrigerant sensor detection port from the base, the shorter the time it takes for the refrigerant leak to be detected by the sensor. To improve the detection rate and alarm time of the refrigerant sensor, the refrigerant sensor can be installed below the welding side of the indoor heat exchanger, close to the connection pipe interface of the air conditioning system. When installed in a pedestal configuration, the height of the air conditioning system connection pipe interface from the base is greater than the height of the refrigerant sensor from the base; preferably, the height of the refrigerant sensor detection port from the indoor unit base is less than 5cm.

[0041] In this application, the refrigerant concentration detected by the refrigerant concentration sensor can be obtained once every time t (the preferred value of time t is 5 seconds).

[0042] Continue to refer to Figure 2 In step 220, if the refrigerant concentration is greater than or equal to a preset concentration threshold, the air conditioning system is determined to be in the current operating mode.

[0043] In this application, if the refrigerant concentration is greater than or equal to a preset concentration threshold, the air conditioning system is determined to be in the current operating mode. In this application, the operating mode may include a cooling mode and a heating mode.

[0044] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different preset concentration thresholds. Therefore, the specific parameter values ​​of the preset concentration thresholds involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0045] In this application, before determining that the air conditioning system is in its current operating mode, a refrigerant leak can be identified if the detected refrigerant concentration is greater than or equal to a preset concentration threshold. In this case, an alarm can be immediately triggered, the air conditioning system buzzer sounds, and the indoor unit indicator displays a fault code to remind the user to perform maintenance and ventilate the system. If an intelligent module is present, it will send a fault message to the terminal reminding the user to open windows for ventilation or automatically open doors and windows to reduce the risk of refrigerant buildup.

[0046] In this application, before determining the current operating mode of the air conditioning system, the following step 221 may also be performed:

[0047] Step 221: Control the indoor fan in the air conditioning system to run at the fourth preset speed.

[0048] In this application, by controlling the indoor fan in the air conditioning system to operate at a fourth preset speed, such as continuously operating at the highest speed of the indoor fan, the accumulated refrigerant can be dispersed in a timely manner, avoiding excessive refrigerant concentration caused by excessive refrigerant accumulation, and improving the safety of the air conditioning system.

[0049] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different fourth preset speeds. Therefore, the specific parameter values ​​of the fourth preset speed involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0050] In this application, before determining the current operating mode of the air conditioning system, the following steps 222 and / or 223 may also be performed:

[0051] Step 222: Control the orientation of the horizontal air guide plate of the indoor unit in the air conditioning system to face upward.

[0052] Step 223: Control the longitudinal air guide vane of the indoor unit in the air conditioning system to perform a left-right swaying motion.

[0053] In this application, by orienting the horizontal air guide vane of the indoor unit of the air conditioning system upward (i.e., towards the ceiling) and / or by having the vertical air guide vane of the indoor unit of the air conditioning system perform a left-right swaying motion, the refrigerant can be dispersed throughout the room under the action of the indoor fan. This further reduces the risk of excessive refrigerant concentration caused by excessive refrigerant accumulation and improves the safety of the air conditioning system.

[0054] Continue to refer to Figure 2 In step 230, the air conditioning system is controlled to perform a refrigerant leakage control action that matches the operating mode.

[0055] In this application, if the air conditioning system is currently operating in cooling mode, the control of the air conditioning system to perform refrigerant leakage control actions matching the operating mode may be performed as follows: Step 231 and / or Step 232 and / or Step 233:

[0056] Step 231: Control the opening degree of the throttling device in the air conditioning system to zero.

[0057] Step 232: Control the outdoor fan in the air conditioning system to run at the first preset speed.

[0058] Step 233: Control the compressor in the air conditioning system to run at a first preset frequency.

[0059] In this application, by controlling the opening degree of the throttling device in the air conditioning system to zero, i.e., closing the throttling device, refrigerant cannot be transported from the outside to the indoor heat exchanger, preventing refrigerant in the outdoor pipeline from leaking into the indoor heat exchanger. Furthermore, this application can also control the outdoor fan in the air conditioning system to operate at a first preset speed, for example, continuously operating at the outdoor fan's maximum speed, which can condense the gaseous refrigerant in the entire air conditioning system into liquid refrigerant. Combined with the throttling device, this liquid refrigerant is blocked in the outdoor air conditioning system pipeline. Furthermore, this application can also control the compressor in the air conditioning system to operate at a first preset frequency, for example, operating at the compressor's maximum frequency, which can accelerate the intake of refrigerant from the indoor heat exchanger pipeline into the compressor for compression, mitigating the degree of refrigerant leakage in the indoor heat exchanger, preventing excessive refrigerant accumulation and resulting in excessively high refrigerant concentration, and improving the safety of the air conditioning system.

[0060] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different first preset speeds and first preset frequencies. Therefore, the specific parameter values ​​of the first preset speed and first preset frequency involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0061] After the second preset time of operation in cooling mode, that is, after the control action according to the steps 231 and / or 232 and / or 233 above, or after the low pressure protection switch of the air conditioning system is detected to be disconnected for a third preset time, it indicates that the amount of refrigerant in the indoor piping of the air conditioning system, such as the indoor heat exchanger piping, is relatively low. At this time, the outdoor fan and / or compressor of the air conditioning system can be controlled to stop running.

[0062] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different second and third preset times. Therefore, the specific parameter values ​​of the second and third preset times involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0063] In this application, if the air conditioning system is currently operating in heating mode, the method for controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode can execute the following steps 234 to 236:

[0064] Step 234: Control the opening degree of the throttling device in the air conditioning system to a preset opening degree.

[0065] Step 235: After the first preset time of operation in heating mode, control the air conditioning system to switch to cooling mode.

[0066] Step 236: In cooling mode, control the opening degree of the throttling device in the air conditioning system to zero; and / or control the outdoor fan in the air conditioning system to run at a second preset speed; and / or control the compressor in the air conditioning system to run at a first preset frequency.

[0067] In this application, since the gaseous refrigerant output from the compressor is first delivered to the indoor heat exchanger in heating mode, the opening degree of the throttling device in the air conditioning system is controlled to a preset opening degree, such as 100%, allowing the liquid refrigerant output from the indoor heat exchanger to be delivered to the outdoor air conditioning system pipeline through the throttling device. After a first preset time of operation in heating mode, i.e., after the opening degree of the throttling device in the air conditioning system is controlled to be the preset opening degree for a first preset time, the air conditioning system is switched to cooling mode by switching the refrigerant delivery direction in the four-way valve. In cooling mode, the opening degree of the throttling device in the air conditioning system is controlled to be zero, and / or the outdoor fan in the air conditioning system is controlled to operate at a second preset speed, and / or the compressor in the air conditioning system is controlled to operate at a first preset frequency.

[0068] In cooling mode, by controlling the opening of the throttling device in the air conditioning system to zero (i.e., closing the throttling device), refrigerant cannot be transported from the outside to the indoor heat exchanger, preventing refrigerant leakage from the outdoor pipes. By controlling the outdoor fan in the air conditioning system to operate at a second preset speed, such as continuously operating at its maximum speed, the gaseous refrigerant in the entire air conditioning system can be condensed into liquid refrigerant. Combined with the throttling device, the liquid refrigerant is blocked in the outdoor air conditioning system pipes. Furthermore, by controlling the compressor in the air conditioning system to operate at a first preset frequency, such as operating at its maximum frequency, the leakage of refrigerant in the indoor heat exchanger can be accelerated and mitigated, preventing excessive refrigerant accumulation and high refrigerant concentration, thus improving the safety of the air conditioning system.

[0069] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different preset opening degrees, first preset time, second preset speed, and first preset frequency. Therefore, the specific parameter values ​​of the preset opening degree, first preset time, second preset speed, and first preset frequency involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0070] After the second preset time of operation in cooling mode, that is, after the control actions of steps 234 to 235 above, or after the low-pressure protection switch of the air conditioning system is detected to be disconnected for a third preset time, it indicates that the amount of refrigerant in the indoor piping of the air conditioning system, such as the indoor heat exchanger piping, is relatively low. At this time, the outdoor fan and / or compressor of the air conditioning system can be controlled to stop running.

[0071] In this application, after controlling the outdoor fan and / or compressor in the air conditioning system to stop operating, the following steps 251 to 252 may also be performed:

[0072] Step 251: Every fourth preset time interval, control the outdoor fan in the air conditioning system to run at a third preset speed, and / or control the compressor in the air conditioning system to run at a second preset frequency.

[0073] Step 252: After the outdoor fan and / or compressor in the air conditioning system has been running for a fifth preset time, control the outdoor fan and / or compressor in the air conditioning system to stop running.

[0074] In this application, the outdoor fan in the air conditioning system is controlled to operate at a third preset speed and / or the compressor in the air conditioning system is controlled to operate at a second preset frequency every fourth preset time interval. This allows the high-pressure refrigerant in the outdoor piping of the air conditioning system, which flows back from the compressor cylinder to the indoor heat exchanger piping, to be drawn back into the compressor for compression and then output back to the outdoor piping of the air conditioning system. After the outdoor fan and / or compressor in the air conditioning system have been running for a fifth preset time, the outdoor fan and / or compressor in the air conditioning system are controlled to stop operating.

[0075] In this way, by repeatedly controlling the outdoor fan in the air conditioning system to run at the third preset speed and / or controlling the compressor in the air conditioning system to run at the second preset frequency, refrigerant leakage caused by the high-pressure refrigerant in the outdoor pipeline flowing back to the indoor heat exchanger through the compressor cylinder can be avoided, excessive refrigerant accumulation can be avoided, and the safety of the air conditioning system can be improved.

[0076] In this application, the second preset frequency may be lower than the first preset frequency.

[0077] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different fourth preset time, fifth preset time, third preset speed, and second preset frequency. Therefore, the specific parameter values ​​of the fourth preset time, fifth preset time, third preset speed, and second preset frequency involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0078] In this application, after controlling the air conditioning system to perform a refrigerant leakage control action that matches the operating mode, the following step 261 can also be performed:

[0079] Step 261: If the refrigerant concentration is less than a preset concentration threshold, or after the air conditioning system executes a refrigerant leakage control action matching the operating mode for a sixth preset time, control the indoor fan in the air conditioning system to stop operating.

[0080] In this application, after the refrigerant concentration is less than a preset concentration threshold, or after the air conditioning system executes a refrigerant leakage control action matching the operating mode for a sixth preset time, it indicates that the risk of refrigerant accumulation is low. At this time, the alarm can be lifted, the indoor fan in the air conditioning system can be stopped, the air conditioning system can be put into standby mode, the throttling device can be closed, and it can be operated to the target opening degree after the next startup.

[0081] It is important to emphasize that the throttling device remains closed throughout the entire refrigerant leak control process.

[0082] In this application, it should be noted that different models or specifications of air conditioning systems can be set with different sixth preset times. Therefore, the specific parameter values ​​of the sixth preset time involved in the technical solution of this application can be set according to actual needs, and this application does not limit them.

[0083] To enable those skilled in the art to better understand this application, the following is combined with Figure 3 The following is an illustration using a specific example:

[0084] See Figure 3 The following is a detailed flowchart of the air conditioning system control method in an embodiment of this application.

[0085] Specifically, this includes steps 301 to 305:

[0086] Step 301: When the refrigerant gas sensor detects that the refrigerant concentration is greater than the preset threshold, the buzzer sounds, the indoor unit light panel displays a fault code, and if there is an intelligent module, the fault is sent to the terminal to remind the user to open the window for ventilation or to automatically open the doors and windows.

[0087] Step 302: Keep the indoor fan running at its highest speed, reverse the direction of the horizontal air guide plate to blow air towards the ceiling, and swing the vertical air guide plate left and right to blow the air out evenly upwards and to the left and right.

[0088] Step 303: In cooling mode, the compressor operates at a frequency of 50 Hz, then the throttling device is turned off. After running for 20 seconds, the compressor and outdoor fan are turned off, and the throttling device remains turned off.

[0089] Step 304: If in heating mode, the electronic throttling device opens to its maximum opening, the compressor frequency drops rapidly to 20Hz, the four-way valve switches quickly, so that after the air conditioning system switches to cooling mode, the compressor frequency rises to 50Hz, and the throttling device is shut off. After running for 20 seconds, the compressor and outdoor fan are turned off, and the throttling device remains shut off.

[0090] Step 305: If the refrigerant gas sensor detects that the refrigerant concentration is less than a threshold, or if the refrigerant leak has lasted for more than 8 hours, the air conditioner malfunctions and locks up, and the indoor fan stops operating. Based on the technical solution proposed in this application, the refrigerant concentration detected by the refrigerant concentration sensor installed below the indoor heat exchanger in the air conditioning system is obtained. When the refrigerant concentration is greater than or equal to a preset concentration threshold, the current operating mode of the air conditioning system is determined, and the air conditioning system is controlled to perform refrigerant leak control actions that match the operating mode. This can prevent excessive refrigerant accumulation caused by refrigerant leakage from the indoor heat exchanger, thereby avoiding excessively high refrigerant concentrations and improving the safety of the air conditioning system.

[0091] This application also provides a computer program product comprising computer instructions stored in a computer-readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform the methods described above.

[0092] Figure 4 A schematic diagram of the structure of the air conditioning system control device in an embodiment of this application is shown.

[0093] Based on the same inventive concept, embodiments of this application also provide an air conditioning system control device. (Reference) Figure 4 The diagram shows a schematic of the structure of an air conditioning system control device according to an embodiment of this application. The air conditioning system control device includes one or more memories 404, one or more processors 402, and at least one computer program (program code) stored in the memory 404 and executable on the processor 402. When the processor 402 executes the computer program, it implements the method described above.

[0094] Among them, Figure 4In this document, a bus architecture (represented by bus 400) is used. Bus 400 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 402 and memory represented by memory 404. Bus 400 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 405 provides an interface between bus 400 and receiver 401 and transmitter 403. Receiver 401 and transmitter 403 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 402 is responsible for managing bus 400 and general processing, while memory 404 can be used to store data used by processor 402 during operation.

[0095] This application also proposes an air conditioning system, which may include, for example, Figure 4 The air conditioning system control device shown.

[0096] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0097] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0098] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0099] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium, including instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0100] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for controlling an air conditioning system, characterized in that, A refrigerant concentration sensor is installed below the indoor heat exchanger in the air conditioning system, and the method includes: Obtain the refrigerant concentration detected by the refrigerant concentration sensor; If the refrigerant concentration is greater than or equal to a preset concentration threshold, then the air conditioning system is determined to be in the current operating mode. Control the air conditioning system to perform refrigerant leakage control actions that match the operating mode.

2. The method according to claim 1, characterized in that, If the operating mode is cooling mode, controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode includes: Control the opening degree of the throttling device in the air conditioning system to zero; and / or Control the outdoor fan in the air conditioning system to operate at a first preset speed; and / or The compressor in the air conditioning system is controlled to operate at a first preset frequency.

3. The method according to claim 1, characterized in that, If the operating mode is heating mode, controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode includes: The opening degree of the throttling device in the air conditioning system is controlled to a preset opening degree; After the heating mode has been running for a first preset time, the air conditioning system is switched to cooling mode. In cooling mode, the opening degree of the throttling device in the air conditioning system is controlled to zero; and / or the outdoor fan in the air conditioning system is controlled to operate at a second preset speed; and / or the compressor in the air conditioning system is controlled to operate at a first preset frequency.

4. The method according to claim 2 or 3, characterized in that, The method further includes: After a second preset time of operation in cooling mode, or after a third preset time of detection that the low-pressure protection switch in the air conditioning system has been disconnected, the outdoor fan and / or compressor in the air conditioning system are controlled to stop operating.

5. The method according to claim 4, characterized in that, After controlling the outdoor fan and / or compressor of the air conditioning system to stop operating, the method further includes: At every fourth preset time interval, the outdoor fan in the air conditioning system is controlled to run at a third preset speed; and / or the compressor in the air conditioning system is controlled to run at a second preset frequency; After the outdoor fan and / or compressor in the air conditioning system has been running for a fifth preset time, the outdoor fan and / or compressor in the air conditioning system are controlled to stop running.

6. The method according to claim 1, characterized in that, Before determining the current operating mode of the air conditioning system, the method further includes: Control the indoor fan in the air conditioning system to operate at a fourth preset speed; The orientation of the horizontal air guide vane of the indoor unit in the air conditioning system is controlled to be upward; The longitudinal air guide vane of the indoor unit in the air conditioning system is controlled to swing left and right.

7. The method according to claim 6, characterized in that, After controlling the air conditioning system to perform refrigerant leakage control actions matching the operating mode, the method further includes: If the refrigerant concentration is less than a preset concentration threshold, or after the air conditioning system executes a refrigerant leakage control action matching the operating mode for a sixth preset time, the indoor fan in the air conditioning system is controlled to stop operating.

8. A computer program product, characterized in that, The computer program product includes computer instructions stored in a computer-readable storage medium and adapted to be read and executed by a processor to cause a computer device having the processor to perform the method as claimed in any one of claims 1 to 7.

9. An air conditioning system control device, characterized in that, The method includes one or more processors and one or more memories, wherein at least one piece of program code is stored in the one or more memories, and the at least one piece of program code is loaded and executed by the one or more processors to implement the method as claimed in any one of claims 1 to 7.

10. An air conditioning system, characterized in that, The air conditioning system includes the air conditioning system control device as described in claim 9.

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