Control method of air conditioning system and air conditioning system

Abstract

The invention discloses a control method of an air conditioning system and the air conditioning system.The control method of the air conditioning system comprises the steps that when the air conditioning system operates, the load coefficient of an outdoor unit and the load coefficient of an indoor unit are obtained; determining a load ratio according to the load coefficient of the outdoor unit and the load coefficient of the indoor unit; judging whether the load ratio is greater than a preset value or not; and if the load ratio is larger than a preset value, it is judged that the risk of transmission sound generation exists, and the load coefficient of the outdoor unit and / or the load coefficient of the indoor unit are / is adjusted so as to reduce the risk of transmission sound generation. By dynamically monitoring and adjusting the load coefficient of the outdoor unit and the load coefficient of the indoor unit, the transmission sound risk generated during operation of the air conditioning system is effectively prevented and reduced, and the user experience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method of an air conditioning system and an air conditioning system. Background Art

[0002] With the increasing popularity of air conditioners and the improvement of people's living standards, people are paying more and more attention to the noise problem of air conditioners. For variable frequency air conditioners, when the load of the air conditioning system is large, the speed of the compressor is high. At this time, the noise, vibration of the compressor, and the pressure pulsation caused by the periodic exhaust of the compressor are relatively intense. In this state, not only will the noise on the outdoor unit side be relatively high, but the noise will also be transmitted to the indoor unit side through the online pipe, generating transmission sound, affecting the user experience. Summary of the invention

[0003] The purpose of the present invention is to provide a control method and an air-conditioning system, aiming to solve the problem in the prior art that when the outdoor unit of the air-conditioning system has a large load, it is easy to generate transmission sound, thereby affecting the user experience.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] The present invention provides a control method for an air conditioning system, wherein the air conditioning system comprises an indoor unit and an outdoor unit, and the method comprises:

[0006] When the air conditioning system is running, the load factor of the outdoor unit and the load factor of the indoor unit are obtained;

[0007] determining a load ratio according to a load factor of the outdoor unit and a load factor of the indoor unit;

[0008] Determining whether the load ratio is greater than a preset value;

[0009] If the load ratio is greater than a preset value, it is determined that there is a risk of transmission sound generation, and the load factor of the outdoor unit and / or the load factor of the indoor unit are adjusted to reduce the risk of transmission sound generation.

[0010] Optionally, when the air conditioning system is running, obtaining the load factor of the outdoor unit and the load factor of the indoor unit includes:

[0011] Get the current compressor frequency and exhaust temperature of the air conditioning system;

[0012] Matching the compressor frequency with a preset frequency load coefficient table to determine the frequency load coefficient a corresponding to the interval to which the compressor frequency belongs; the frequency load coefficient table stores a plurality of compressor frequency intervals and the frequency load coefficient corresponding to each compressor frequency interval;

[0013] Matching the exhaust temperature with a preset exhaust temperature coefficient table to determine an exhaust temperature coefficient b corresponding to the exhaust temperature interval; the exhaust temperature coefficient table stores a plurality of exhaust temperature intervals and an exhaust temperature coefficient corresponding to each exhaust temperature interval;

[0014] Calculate the load factor λ of the outdoor unit according to the following formula:

[0015] λ=a+b+λ0, where λ0 is the load factor compensation value of the outdoor unit.

[0016] Optionally, when the air conditioning system is running, obtaining the load factor of the outdoor unit and the load factor of the indoor unit includes:

[0017] Get the current internal fan speed R of the air conditioning system;

[0018] Calculate the load factor γ of the indoor unit according to the following formula:

[0019] γ=c×R+γ0, where c is the speed coefficient and γ0 is the load factor compensation value of the indoor unit.

[0020] Optionally, determining the load ratio according to the load factor of the outdoor unit and the load factor of the indoor unit includes:

[0021] Calculate the load ratio δ as follows:

[0022] δ=λ / γ+δ0

[0023] Among them, λ is the load factor of the outdoor unit, γ is the load factor of the indoor unit, and δ0 is the load ratio compensation value.

[0024] Optionally, the adjusting the load factor of the outdoor unit and / or the load factor of the indoor unit includes:

[0025] Determining whether the air conditioning system is in a silent mode or a sleep mode;

[0026] If the air conditioning system is in a silent mode or a sleep mode, reducing the load factor of the outdoor unit;

[0027] If the air conditioning system is not in the silent mode and the sleep mode, the load factor of the indoor unit is increased.

[0028] Optionally, reducing the load factor of the outdoor unit includes:

[0029] Increase the opening of the electronic expansion valve of the air-conditioning system, and / or reduce the frequency of the compressor of the air-conditioning system.

[0030] Optionally, the increasing the load factor of the indoor unit includes:

[0031] Increase the internal fan speed of the air conditioning system.

[0032] Optionally, after adjusting the load factor of the outdoor unit and / or the load factor of the indoor unit, the method further comprises:

[0033] After a period of time t1, the current load ratio of the air conditioning system is recalculated, and it is determined whether the current load ratio is greater than a preset value;

[0034] If the current load ratio is greater than the preset value, continue to adjust the load factor of the outdoor unit and / or the load factor of the indoor unit;

[0035] If the current load ratio is less than or equal to the preset value, return to recalculate and judge.

[0036] Optionally, each time the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, the adjustment range is within a preset range.

[0037] The present invention also provides an air-conditioning system, comprising: an indoor unit and an outdoor unit, and also comprising a controller, wherein the controller is used to execute the control method of the air-conditioning system as described in any one of claims 1-9.

[0038] The embodiment of the present invention provides a control method of an air-conditioning system and an air-conditioning system, wherein the control method of the air-conditioning system includes: when the air-conditioning system is running, obtaining the load factor of the outdoor unit and the load factor of the indoor unit; determining the load ratio according to the load factor of the outdoor unit and the load factor of the indoor unit; judging whether the load ratio is greater than a preset value; if the load ratio is greater than the preset value, judging that there is a risk of transmission sound generation, and adjusting the load factor of the outdoor unit and / or the load factor of the indoor unit to reduce the risk of transmission sound generation. The present invention effectively prevents and reduces the risk of transmission sound generated when the air-conditioning system is running by dynamically monitoring and adjusting the load factor of the outdoor unit and the load factor of the indoor unit, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0040] Figure 1 A schematic diagram of a flow chart of a method for controlling an air conditioning system provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of a sub-process of a method for controlling an air-conditioning system provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of another sub-process of the control method of the air-conditioning system provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of another sub-process of the control method of the air-conditioning system provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of another sub-process of the control method of the air-conditioning system provided by an embodiment of the present invention;

[0045] Figure 6 A flow chart of the control logic of the control method of the air conditioning system provided by the embodiment of the present invention;

[0046] Figure 7 A flow chart of the control logic for reducing the risk of transmission sound generation provided by an embodiment of the present invention;

[0047] Figure 8 A schematic diagram of the device structure of an air conditioning system provided in an embodiment of the present invention.

[0048] Description of the symbols in the figure:

[0049] 100, indoor unit; 101, indoor fan; 102, indoor heat exchanger; 103, indoor sensor;

[0050] 200, outdoor unit; 201, compressor; 202, outdoor heat exchanger; 203, exhaust temperature sensor; 204, throttling device;

[0051] 300. Controller. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0054] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0055] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0056] See also Figure 1 , Figure 1 A flow chart of a control method of an air conditioning system provided in an embodiment of the present invention, the air conditioning system includes an indoor unit and an outdoor unit, and the method includes steps S101 to S104:

[0057] S101. When the air conditioning system is running, obtain a load factor of an outdoor unit and a load factor of an indoor unit;

[0058] In this embodiment, the load factor is used to describe the working intensity or energy consumption of equipment (such as outdoor units and indoor units) under specific working conditions, and it reflects the load state of the equipment during actual operation.

[0059] In one embodiment, if Figure 2 As shown, the step S101 includes steps S201 to S204:

[0060] S201, obtaining the current compressor frequency and exhaust temperature of the air conditioning system;

[0061] S202, matching the compressor frequency with a preset frequency load coefficient table to determine a frequency load coefficient a corresponding to the interval to which the compressor frequency belongs; the frequency load coefficient table stores a plurality of compressor frequency intervals and a frequency load coefficient corresponding to each compressor frequency interval;

[0062] S203, matching the exhaust temperature with a preset exhaust temperature coefficient table to determine an exhaust temperature coefficient b corresponding to the exhaust temperature interval; the exhaust temperature coefficient table stores a plurality of exhaust temperature intervals and an exhaust temperature coefficient corresponding to each exhaust temperature interval;

[0063] S204. Calculate the load factor λ of the outdoor unit according to the following formula:

[0064] λ=a+b+λ0, where λ0 is the load factor compensation value of the outdoor unit.

[0065] In this embodiment, it is first necessary to obtain the current operating frequency and exhaust temperature of the compressor in the air-conditioning system. In step S202, the preset frequency load factor table is a tool for allocating corresponding frequency load factors according to different intervals of the compressor frequency. This factor reflects the workload of the compressor at different frequencies. In this step, the system will compare the currently obtained compressor frequency with the intervals in the table, find the best matching interval, and determine the frequency load factor a corresponding to the interval.

[0066] In step S203, similarly, the preset exhaust temperature coefficient table is also a tool for allocating corresponding exhaust temperature coefficients according to different exhaust temperature intervals. This coefficient reflects the workload of the compressor at different exhaust temperatures. In this step, the system compares the currently acquired exhaust temperature with the intervals in the table, finds the best matching interval, and determines the exhaust temperature coefficient b corresponding to the interval.

[0067] In step S204, the total load factor λ of the outdoor unit is calculated based on the aforementioned determined frequency load factor a, exhaust temperature coefficient b and a preset outdoor unit load factor compensation value λ0.

[0068] The calculation formula is: λ=a+b+λ0. Among them, λ0 is the load factor compensation value of the outdoor unit, which is used to adjust or compensate the calculation result of the load factor.

[0069] Through the above steps, the air conditioning system can dynamically calculate the load factor λ of the outdoor unit, which reflects the workload of the outdoor unit under the current working conditions. This information is of great significance for optimizing the operation strategy of the air conditioning system, improving energy efficiency, and preventing transmission noise.

[0070] In addition, it should be noted that the preset frequency load factor table and exhaust temperature factor table should be customized or adjusted according to the specific model of the air-conditioning system, working environment and other factors to ensure the accuracy and reliability of the calculation results.

[0071] In one embodiment, if Figure 3 As shown, the step S101 also includes steps S301 to S302:

[0072] S301, obtaining the current internal fan speed R of the air conditioning system;

[0073] S302. Calculate the load factor γ of the indoor unit according to the following formula:

[0074] γ=c×R+γ0, where c is the speed coefficient and γ0 is the load factor compensation value of the indoor unit.

[0075] In this embodiment, it is first necessary to obtain the current internal fan speed R of the air-conditioning system. The internal fan speed R is an important indicator reflecting the indoor air flow speed and circulation efficiency.

[0076] In step S302, the system uses a preset formula to calculate the load factor γ of the indoor unit. This formula takes into account the speed R of the indoor fan and two preset constants: the speed coefficient c and the indoor unit load factor compensation value γ0. The speed coefficient c reflects the coefficient of the relationship between the indoor fan speed R and the indoor unit load. The indoor unit load factor compensation value γ0 is used to adjust or compensate for the constant of the load factor calculation result.

[0077] The calculation formula of the load factor γ of the indoor unit converts the indoor fan speed R into the load factor γ of the indoor unit, thereby reflecting the working load of the indoor unit under the current working conditions.

[0078] Through the above steps, the air-conditioning system can dynamically calculate the load factor γ of the indoor unit. This factor is of great significance for optimizing the operation strategy of the air-conditioning system and ensuring indoor comfort.

[0079] It should be noted that the preset speed coefficient c and the indoor unit load coefficient compensation value γ0 should be customized or adjusted according to the specific model of the air-conditioning system, the working environment and other factors to ensure the accuracy and reliability of the calculation results. It should be noted that the internal fan speed R is preset according to the wind speed under different operating states of the prototype (such as cooling state, heating state). After the user sets different wind speeds, the internal fan speed R is adjusted to the corresponding speed. The adjustment of the internal fan speed R in this application is adjusted on the preset speed of the air-conditioning system.

[0080] S102, determining a load ratio according to a load factor of the outdoor unit and a load factor of the indoor unit;

[0081] In this embodiment, the system first obtains the load factor λ of the outdoor unit calculated in step S204 and the load factor γ of the indoor unit calculated in step S302. Then, the system uses a preset formula or method to calculate the ratio between the two load factors, i.e., the load ratio. This ratio reflects the relative relationship between the outdoor unit and the indoor unit in terms of workload.

[0082] Furthermore, through the load ratio, the system can determine whether the load between the outdoor unit and the indoor unit is balanced. If the load ratio deviates from the preset range, it means that there is a problem with the air conditioning system. For example, the load on the outdoor side of the air conditioning system is significantly higher than the load on the indoor side. In this state, the noise of the outdoor unit may be transmitted to the indoor unit through the online pipe, increasing the risk of transmission sound and affecting the user experience.

[0083] In one embodiment, the step S102 includes step S401:

[0084] S401. Calculate the load ratio δ as follows:

[0085] δ=λ / γ+δ0

[0086] Among them, λ is the load factor of the outdoor unit, γ is the load factor of the indoor unit, and δ0 is the load ratio compensation value.

[0087] In this embodiment, the load ratio δ is calculated according to the above formula. By monitoring and analyzing the load ratio, the load relationship between the outdoor unit and the indoor unit in the air-conditioning system can be identified, and it can be determined whether there is a problem of load imbalance between the outdoor unit and the indoor unit, and corresponding optimization measures can be taken.

[0088] S103, determining whether the load ratio is greater than a preset value;

[0089] In this embodiment, the air conditioning system compares the previously calculated load ratio δ with a preset value δ1. This preset value δ1 is usually set based on the performance requirements of the air conditioning system, noise control standards, user preferences, etc. If the load ratio δ is greater than the preset value δ1, this may mean that the current working state of the air conditioning system may cause a higher noise level, and in particular, may increase the risk of transmission sound.

[0090] S104. If the load ratio is greater than a preset value, it is determined that there is a risk of transmission sound generation, and the load factor of the outdoor unit and / or the load factor of the indoor unit are adjusted to reduce the risk of transmission sound generation.

[0091] In this embodiment, if δ>δ1, it means that the load of the outdoor unit is significantly higher than that of the indoor unit. In this state, the noise of the outdoor unit may be transmitted to the indoor unit through the online pipe, increasing the risk of transmission sound and affecting the user experience. Therefore, the air conditioning system needs to take measures to reduce the risk of transmission sound. The load factor of the outdoor unit and / or the indoor unit can be adjusted. The specific method is described in detail in the following steps.

[0092] When adjusting the load factor, the air conditioning system needs to consider multiple factors, such as energy efficiency, indoor and outdoor temperature difference, user comfort requirements, etc., to ensure that the overall performance of the system and the user experience are not affected while reducing the risk of transmitted sound.

[0093] It should be noted that the air conditioning system should monitor the load ratio in real time. Once the load ratio exceeds the preset value, the adjustment mechanism should be activated immediately to ensure a quick response. When adjusting the load factor of the outdoor unit and / or the load factor of the indoor unit, excessive reduction should be avoided to avoid system performance degradation or increased energy consumption.

[0094] In one embodiment, if Figure 4 As shown, in the step S104, the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, including steps S501 to S503:

[0095] S501, determining whether the air conditioning system is in a silent mode or a sleep mode;

[0096] S502: if the air conditioning system is in silent mode or sleep mode, reducing the load factor of the outdoor unit;

[0097] S503: If the air-conditioning system is not in the silent mode or the sleep mode, increase the load factor of the indoor unit.

[0098] In this embodiment, it is first necessary to determine the working mode of the air conditioning system set by the user. If the air conditioning system is set to silent mode or sleep mode, it means that the user has a high requirement for indoor noise. In this working mode, the air conditioning system will perform a corresponding control process.

[0099] In step S502, if the air conditioning system is in silent mode or sleep mode, in order to reduce noise and energy consumption, the air conditioning system will take measures to reduce the load of the outdoor unit and reduce the load factor of the outdoor unit.

[0100] In step S503, if the air conditioning system is not in silent mode or sleep mode, the load factor of the indoor unit is increased. If the system is not set to silent mode or sleep mode, it means that the user has relatively low requirements for indoor noise, so the load factor of the indoor unit will be increased. However, it should be noted that increasing the load factor of the indoor unit may increase the noise output and energy consumption of the system. Therefore, when making such adjustments, the air conditioning system needs to comprehensively consider the user's comfort requirements, energy efficiency goals and noise control standards.

[0101] In one embodiment, in the step S502, reducing the load factor of the outdoor unit includes step S601:

[0102] S601. Increase the opening of the electronic expansion valve of the air-conditioning system, and / or reduce the frequency of the compressor of the air-conditioning system.

[0103] In this embodiment, the transmission sound is generated when the compressor noise is transmitted to the indoor side through the connection pipe when the air conditioning system load is large. When the compressor frequency P and the exhaust temperature T are reduced, the load of the outdoor unit is reduced, which can fundamentally avoid the generation of the transmission sound. The exhaust temperature T is determined by controlling the opening F of the electronic expansion valve. Increasing the opening of the electronic expansion valve will reduce the exhaust temperature T.

[0104] Specifically, the electronic expansion valve is a key component for controlling the refrigerant flow in the air conditioning system. By increasing the opening of the electronic expansion valve by F1, the outlet temperature of the air conditioning system compressor is reduced, that is, the exhaust temperature T is reduced. By reducing the compressor frequency by P1, the air conditioning system can reduce the speed and power output of the compressor, so that the compression amount of the refrigerant is reduced, which helps to reduce the noise output of the air conditioning system.

[0105] In one embodiment, in the step S503, increasing the load factor of the indoor unit includes step S701:

[0106] S701, increasing the speed of the internal fan of the air conditioning system.

[0107] In this embodiment, the indoor unit is not in silent mode or sleep mode, indicating that the user has relatively low requirements for the noise level of the indoor side, and the speed of the indoor fan can be adjusted. In the air conditioning system, the indoor fan (also called the indoor fan or the air supply fan) is responsible for delivering the air cooled or heated by the evaporator into the room, thereby achieving temperature regulation. The speed of the indoor fan directly affects the amount of air supply, which in turn affects the speed of change of the indoor temperature and the cooling or heating capacity of the air conditioning system.

[0108] By increasing the speed of the indoor fan by R1, the air-conditioning system can increase the air supply, increase the load of the indoor unit, and speed up the change of indoor temperature. It can balance the load difference between the outdoor unit and the indoor unit to a certain extent, and effectively avoid the risk of possible transmission sound.

[0109] In one embodiment, if Figure 5 As shown, in the step S104, after the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, steps S801 to S803 are included:

[0110] S801, after a period of time t1, recalculate the current load ratio of the air conditioning system, and determine whether the current load ratio is greater than a preset value;

[0111] S802: If the current load ratio is greater than a preset value, continue to adjust the load factor of the outdoor unit and / or the load factor of the indoor unit;

[0112] S803: If the current load ratio is less than or equal to the preset value, return to recalculate and judge.

[0113] In this embodiment, the time interval t1 is a preset time period, which is used to ensure that the air conditioning system has enough time to respond to the last adjustment and reflect the actual effect after the adjustment. Then the current load ratio δ2 of the air conditioning system is recalculated, and the recalculated load ratio δ2 is compared with the preset value δ1 to determine whether the current load ratio δ2 is greater than the preset value δ1. In step S802, if the current load ratio δ2 is greater than the preset value δ1, it means that the load difference between the outdoor unit and the indoor unit of the air conditioning system is still large, and it is necessary to continue to adjust the load factor of the outdoor unit and / or the indoor unit as in steps S501 to S503.

[0114] In step S803, if the current load ratio is less than or equal to the preset value, it means that the air-conditioning system is already in a relatively ideal working state, that is, the loads on the outdoor unit and the indoor unit are relatively uniform, and there is no risk of generating transmission sound. At this time, the system will not make new adjustments immediately, but will wait for the next time interval t1 to arrive, and then recalculate the load ratio and make a judgment.

[0115] In one embodiment, the control method of the air conditioning system includes step S901:

[0116] S901. Each time the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, the adjustment range is within a preset range.

[0117] In this embodiment, the adjustment amplitude refers to the amount or proportion of the load factor change each time the load factor is adjusted. This amplitude should be small enough to ensure that the system can smoothly transition to a new working state without causing excessive shock or instability. F1, P1 and R1 are preset values ​​of the air conditioning system.

[0118] In one embodiment, the load factor compensation value λ0 of the outdoor unit, the load factor compensation value γ0 of the indoor unit, the load ratio compensation value δ0, the load ratio preset value δ1, the frequency adjustment amount P1, the electronic expansion valve opening adjustment amount F1, the indoor fan speed adjustment amount R1, and the time t1 can be set differently according to the differences in the air-conditioning systems; the speed coefficient c can be set differently according to the differences in the shells of the indoor units.

[0119] In summary, if Figure 6As shown in the figure, it is a control logic flow chart of the control method of the air conditioning system, and the control logic is described in detail: after the air conditioning system is turned on and operated, the current compressor frequency P, exhaust temperature T and internal fan speed R of the air conditioning system are obtained; then, the load factor λ of the outdoor unit is determined according to the compressor frequency P and the exhaust temperature T, and the load factor γ of the indoor unit is determined according to the internal fan speed R. Specifically, according to the interval where the current compressor frequency P is located, the frequency load factor a is obtained, such as when the compressor frequency P is in the range of [20Hz, 30Hz), the frequency load factor a is 0.25; according to the interval where the current exhaust temperature T is located, the exhaust temperature coefficient b is obtained, such as when the exhaust temperature T is in the range of [40℃, 50℃), the frequency load factor b is 0.45. The load factor λ of the outdoor unit is a+b+λ0, where λ0 is the load factor compensation value of the outdoor unit, which needs to be preset for the air conditioning system. The load factor of the indoor unit γ=c×R+γ0, where: c is the speed coefficient. Since the speed change has different effects on the load such as the indoor unit air volume under different indoor unit shells, the speed coefficient c needs to be preset for the indoor unit shell; γ0 is the load factor compensation value of the indoor unit, which needs to be preset for the air-conditioning system.

[0120] Next, the load ratio δ is determined according to the load factor λ of the outdoor unit and the load factor γ of the indoor unit. Specifically, δ=λ / γ+δ0, where δ0 is the load ratio compensation value. Since the functions of the indoor heat exchanger and the outdoor heat exchanger are interchanged in the cooling or heating mode, the load ratio of the air-conditioning system in the normal state is different, so δ0 needs to be preset according to the operation mode of the air-conditioning system.

[0121] Finally, determine whether the value of the load ratio δ is greater than the preset value δ1. When δ>δ1, it means that the load of the outdoor unit of the air-conditioning system is significantly higher than the load of the indoor unit. In this state, the noise of the outdoor unit may be transmitted to the inside through the online pipe, that is, transmission sound is generated, affecting the user experience. At this time, it is necessary to enter the anti-transmission sound control step, that is, adjust the load factor of the outdoor unit and / or the load factor of the indoor unit to reduce the risk of transmission sound. When δ≤δ1, it means that the outdoor and indoor loads of the air-conditioning system are relatively uniform at this time, and there is no risk of transmission sound. It is not necessary to enter the anti-transmission sound control step, so no action is required. Then, after waiting for a period of time, you can return to obtain the current compressor frequency P, exhaust temperature T and indoor fan speed R of the air-conditioning system, and continue to judge.

[0122] like Figure 7As shown in the figure, a control logic flow chart for reducing the risk of transmission sound is provided. The control logic is described in detail: Determine whether the indoor unit is currently in silent mode or sleep mode. When the indoor unit is set to silent mode or sleep mode, it means that the user has a high requirement for the noise on the indoor side. If the speed of the indoor fan is increased, the wind noise on the indoor side will become louder, which is contrary to the user's needs. Therefore, when the indoor unit is set to silent mode or sleep mode, the opening F of the electronic expansion valve is increased and the compressor frequency P is reduced. As mentioned above, transmission sound is generated when the load of the air-conditioning system is large and the noise of the compressor is transmitted to the indoor side through the online pipe. When the compressor frequency P and the exhaust temperature T are reduced, the load on the outdoor side is reduced, which can fundamentally avoid the generation of transmission sound. However, in order to avoid excessive impact on the cooling or heating effect of the air conditioner, the compressor frequency P and the exhaust temperature T should be gradually adjusted to avoid a large impact on the cooling or heating effect of the air-conditioning system, which will affect the user experience. When the indoor unit is not in silent mode or sleep mode, it means that the user has a relatively low requirement for the noise on the indoor side, and the speed R of the indoor fan can be adjusted. When the speed R of the indoor fan increases, the load of the indoor unit increases, which can balance the load difference between the outdoor unit and the indoor unit to a certain extent, and the wind sound on the indoor side will also become louder at this time, covering up the possible transmission sound. After time t1, the load ratio δ is recalculated to obtain the current load ratio δ2, and it is determined whether the current load ratio δ2 is greater than the preset value δ1. Since the exhaust temperature of the air-conditioning system changes slowly, after the adjustment of the above steps, it is necessary to calculate the load ratio of the air-conditioning system after a period of time t1. When the adjusted load ratio δ2≤δ1, it means that the load of the outdoor unit and the indoor unit of the air-conditioning system is relatively uniform at this time, and there is no risk of transmission sound. If the adjusted load ratio δ2 is still greater than δ1, it means that the load difference between the outdoor unit and the indoor unit of the air-conditioning system is still large at this time, and it is necessary to continue to adjust until the load ratio δ2≤δ1.

[0123] The embodiment of the present invention also provides an air conditioning system, such as Figure 8 As shown, it includes an indoor unit 100 and an outdoor unit 200, and also includes a controller 300, and the controller 300 is used to execute the control method as described above.

[0124] Furthermore, the air conditioning system also includes: a compressor 201, an outdoor heat exchanger 202, an exhaust temperature sensor 203 and a throttling device 204 connected to the outdoor unit 200; and an indoor fan 101, an indoor heat exchanger 102 and an indoor sensor 103 connected to the indoor unit 100.

[0125] Specifically, the controller 300 is responsible for executing the control steps of transmitting sound, specifically adjusting the load factor of the outdoor unit 200 and the load factor of the indoor unit 100. The compressor 201 is responsible for compressing the refrigerant to increase its temperature and pressure, providing power for the refrigeration or heating cycle. In the refrigeration mode, the low-temperature and low-pressure refrigerant gas is sucked in by the compressor 201 and pressurized to become a high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant will release heat to the external environment through the outdoor heat exchanger 202 and become a low-temperature and low-pressure liquid. The low-temperature and low-pressure liquid refrigerant becomes a low-temperature and low-pressure gas, and the low-temperature and low-pressure refrigerant gas is sucked in by the compressor 201 again, and the cycle is repeated, thereby achieving a refrigeration effect. In the heating mode, the outdoor heat exchanger 202 absorbs heat from the outside. The exhaust temperature sensor 203 is used to monitor the temperature of the refrigerant discharged by the compressor 201 in real time. The throttling device 204 is provided with an electronic expansion valve, which plays a role in adjusting the refrigerant flow to change the exhaust temperature. The indoor fan 101 is responsible for sending the air processed by the indoor heat exchanger 102 into the room, bringing a comfortable temperature experience to the user. In the cooling mode, the indoor heat exchanger 102 absorbs the heat in the room and brings it to the outdoor unit 200 for release through the refrigerant; in the heating mode, the opposite is true. The indoor sensor 103 can detect indoor parameters such as temperature and humidity, and provide the controller with accurate indoor environment data.

[0126] It should be noted that those skilled in the art can clearly understand that the specific implementation process of the above-mentioned system and each unit can refer to the corresponding description in the aforementioned method embodiment, and for the convenience and brevity of description, it will not be repeated here.

[0127] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A control method for an air conditioning system, the air conditioning system comprising an indoor unit and an outdoor unit, characterized in that: The method comprises: When the air conditioning system is running, the load factor of the outdoor unit and the load factor of the indoor unit are obtained; determining a load ratio according to a load factor of the outdoor unit and a load factor of the indoor unit; Determining whether the load ratio is greater than a preset value; If the load ratio is greater than a preset value, it is determined that there is a risk of transmission sound generation, and the load factor of the outdoor unit and / or the load factor of the indoor unit are adjusted to reduce the risk of transmission sound generation.

2. The control method of the air conditioning system according to claim 1, characterized in that: When the air conditioning system is running, obtaining the load factor of the outdoor unit and the load factor of the indoor unit includes: Get the current compressor frequency and exhaust temperature of the air conditioning system; Matching the compressor frequency with a preset frequency load coefficient table to determine the frequency load coefficient a corresponding to the interval to which the compressor frequency belongs; the frequency load coefficient table stores a plurality of compressor frequency intervals and the frequency load coefficient corresponding to each compressor frequency interval; Matching the exhaust temperature with a preset exhaust temperature coefficient table to determine an exhaust temperature coefficient b corresponding to the exhaust temperature interval; the exhaust temperature coefficient table stores a plurality of exhaust temperature intervals and an exhaust temperature coefficient corresponding to each exhaust temperature interval; Calculate the load factor λ of the outdoor unit according to the following formula: λ=a+b+λ0, where λ0 is the load factor compensation value of the outdoor unit.

3. The control method of the air conditioning system according to claim 1, characterized in that: When the air conditioning system is running, obtaining the load factor of the outdoor unit and the load factor of the indoor unit includes: Get the current internal fan speed R of the air conditioning system; Calculate the load factor γ of the indoor unit according to the following formula: γ=c×R+γ0, where c is the speed coefficient and γ0 is the load factor compensation value of the indoor unit.

4. The control method of the air conditioning system according to claim 1, characterized in that: The determining the load ratio according to the load factor of the outdoor unit and the load factor of the indoor unit includes: Calculate the load ratio δ as follows: δ=λ / γ+δ0 Among them, λ is the load factor of the outdoor unit, γ is the load factor of the indoor unit, and δ0 is the load ratio compensation value.

5. The control method of the air conditioning system according to claim 1, characterized in that: The adjusting the load factor of the outdoor unit and / or the load factor of the indoor unit includes: Determining whether the air conditioning system is in a silent mode or a sleep mode; If the air conditioning system is in a silent mode or a sleep mode, reducing the load factor of the outdoor unit; If the air conditioning system is not in the silent mode and the sleep mode, the load factor of the indoor unit is increased.

6. The control method of the air conditioning system according to claim 5, characterized in that: The reducing the load factor of the outdoor unit includes: Increase the opening of the electronic expansion valve of the air-conditioning system, and / or reduce the frequency of the compressor of the air-conditioning system.

7. The control method of the air conditioning system according to claim 5, characterized in that: The step of increasing the load factor of the indoor unit comprises: Increase the internal fan speed of the air conditioning system.

8. The control method of the air conditioning system according to claim 1, characterized in that: After the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, the method further comprises: After a period of time t1, the current load ratio of the air conditioning system is recalculated, and it is determined whether the current load ratio is greater than a preset value; If the current load ratio is greater than the preset value, continue to adjust the load factor of the outdoor unit and / or the load factor of the indoor unit; If the current load ratio is less than or equal to the preset value, return to recalculate and judge.

9. The control method of the air conditioning system according to claim 8, characterized in that: Each time the load factor of the outdoor unit and / or the load factor of the indoor unit is adjusted, the adjustment range is within a preset range.

10. An air conditioning system, characterized in that: include: The indoor unit and the outdoor unit also include a controller, and the controller is used to execute the control method according to any one of claims 1-9.

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