Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioning system and a control method thereof, and aims to solve the problems that an existing adjusting mode has great influence on refrigeration and heating, and resonance elimination cannot be guaranteed. In order to achieve the purpose, the control method comprises the step that the rotating speed of the outdoor fan is determined according to the difference value of the frequency of the compressor and the frequency of the outdoor fan. And if the absolute value of the difference value between the frequency of the compressor and the frequency of the outdoor fan is smaller than a first preset value, the rotating speed of the outdoor fan is adjusted according to the working mode of the air conditioning system. The mode of adjusting the rotating speed of the outdoor fan is adopted for the first time, and the influence on the user experience can be reduced; the mode of adjusting the frequency of the compressor is adopted for secondary adjustment, the adjusting period can be shortened, and it is avoided that due to frequent adjustment, the air conditioner system operates unstably, and the use experience of a user is greatly influenced.

Description

Technical Field

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

[0002] Air conditioners have become essential electrical appliances in families and office buildings. In order to be more energy-efficient and adaptable to various working conditions, existing air conditioners are basically variable-frequency air conditioners. During the operation of the outdoor unit of a variable-frequency air conditioner, since the compressor frequency and the speed of the outdoor fan are constantly changing, resonance is inevitable at a certain frequency, and seriously, it will be transmitted to the indoor side through the connecting pipe, causing complaints from users.

[0003] Existing air conditioners avoid resonance noise by compressor frequency hopping, that is, by reducing or increasing the compressor frequency under specific working conditions to avoid the original frequency to achieve the purpose of reducing resonance noise. However, simply adjusting the compressor frequency will affect the cooling or heating effect, and it cannot guarantee whether resonance can be effectively avoided and the noise caused by resonance can be reduced after adjustment.

[0004] Therefore, there is an urgent need for an air conditioning system and a control method thereof to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problems that the existing adjustment method has a greater impact on cooling and heating and cannot guarantee the elimination of resonance.

[0006] In a first aspect, the present invention provides a control method for an air conditioning system, the air conditioning system includes a compressor and an outdoor fan, and the control method includes:

[0007] Determine the speed of the outdoor fan according to the difference between the frequency of the compressor and the frequency of the outdoor fan.

[0008] In a specific embodiment of the control method for the above air conditioning system, "determine the speed of the outdoor fan according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes:

[0009] If the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than a first preset value, adjust the speed of the outdoor fan according to the working mode of the air conditioning system.

[0010] In a specific embodiment of the control method for the above air conditioning system, "adjust the speed of the outdoor fan according to the working mode of the air conditioning system" includes:

[0011] If the air conditioning system is in the heating mode, reduce the speed of the outdoor fan; preferably, the reduction amount of the speed of the outdoor fan is determined according to the current speed of the outdoor fan; and / or

[0012] If the air - conditioning system is in the cooling mode, increase the rotational speed of the outdoor fan; preferably, the increase amount of the rotational speed of the outdoor fan is determined according to the current rotational speed of the outdoor fan.

[0013] In a specific implementation manner of the control method of the above - mentioned air - conditioning system, after the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan.

[0014] In a specific implementation manner of the control method of the above - mentioned air - conditioning system, "after the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes:

[0015] After the rotational speed of the outdoor fan is adjusted and runs for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than a second preset value, the outdoor fan runs at the current rotational speed; wherein, the second preset value is greater than the first preset value.

[0016] In a specific implementation manner of the control method of the above - mentioned air - conditioning system, "after the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes:

[0017] After the rotational speed of the outdoor fan is adjusted and runs for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, the outdoor fan resumes to the initial rotational speed and adjusts the frequency of the compressor;

[0018] Preferably, "adjust the frequency of the compressor" includes: increase the frequency of the compressor.

[0019] In a specific implementation manner of the control method of the above - mentioned air - conditioning system, in a specific implementation manner of the control method of the above - mentioned air - conditioning system, the increased value of the frequency of the compressor is determined according to the frequency of the compressor and the frequency of the outdoor fan;

[0020] Preferably, when the frequency of the compressor is greater than the frequency of the outdoor fan, the frequency of the compressor is increased by the first preset value;

[0021] When the frequency of the compressor is less than the frequency of the outdoor fan, the frequency of the compressor is increased by 2× the first preset value.

[0022] In the specific implementation of the control method of the above air conditioning system, "after adjusting the speed of the outdoor fan, determining the speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes:

[0023] After the speed of the outdoor fan is adjusted and operates for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than a first preset value, the outdoor fan maintains its current speed and the frequency of the compressor is adjusted.

[0024] Preferably, "adjusting the frequency of the compressor" includes: increasing the frequency of the compressor.

[0025] In the specific implementation of the control method of the above air conditioning system, the increased value of the frequency of the compressor is determined according to the frequency of the compressor and the frequency of the outdoor fan;

[0026] Preferably, when the frequency of the compressor is greater than the initial frequency of the outdoor fan, the frequency of the compressor is increased by the first preset value;

[0027] When the frequency of the compressor is less than the initial frequency of the outdoor fan, the frequency of the compressor is increased by 2× the first preset value.

[0028] In a second aspect, the present invention provides an air conditioning system, which includes a control module configured to be able to execute the control method of the air conditioning system as described above.

[0029] In the case of adopting the above technical solution, the control method of the present invention includes: determining the speed of the outdoor fan according to the difference between the frequency of the compressor and the frequency of the outdoor fan. Specifically, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than a first preset value, the speed of the outdoor fan is adjusted according to the working mode of the air conditioning system. The speed of the outdoor fan is adjusted first. Although the adjustment of the speed of the outdoor fan will affect the heating or cooling effect, the impact is relatively small, and the impact on the user experience is relatively small compared to adjusting the frequency of the compressor. Therefore, the method of adjusting the speed of the outdoor fan is adopted first for adjustment.

[0030] If the air conditioning system is in the heating mode, the speed of the outdoor fan is reduced. Reducing the speed of the outdoor fan can reduce the energy consumption of the air conditioning system. Although reducing the speed of the outdoor fan may cause a slight reduction in the heating capacity, the reduction in the heating capacity is very small and will not have a substantial impact on the user's experience. Therefore, it is preferable to reduce the speed of the outdoor fan to reduce the overall energy consumption of the air conditioning system.

[0031] If the air - conditioning system is in the cooling mode, increase the rotational speed of the outdoor fan. Increasing the rotational speed of the outdoor fan can enhance the heat - exchange capacity of the outdoor heat exchanger, increasing the heat released by the outdoor heat exchanger, reducing the temperature of the refrigerant flowing to the indoor heat exchanger, enhancing the heat - exchange capacity of the indoor heat exchanger, ensuring sufficient cooling in the room, and guaranteeing the user experience.

[0032] After the rotational speed of the outdoor fan is adjusted and operated for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than the second preset value, the outdoor fan operates at the current rotational speed; where the second preset value is greater than the first preset value. The absolute value of the difference being greater than the second preset value means that the difference between the frequency of the compressor and the frequency of the outdoor fan is large, and the compressor and the outdoor fan will not resonate and will not generate excessive noise. Since the vibration frequency of the outdoor fan is mainly affected by the rotational speed of the outdoor fan, but other aspects can also affect the vibration frequency. Moreover, after the rotational speed of the outdoor fan is adjusted, the vibration frequency of the outdoor fan is not very stable. Therefore, when the absolute value of the difference is greater than the second preset value, maintaining the current state of operation can avoid generating errors.

[0033] After the rotational speed of the outdoor fan is adjusted and operated for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, the outdoor fan maintains the current rotational speed and adjusts the frequency of the compressor. Specifically, increase the frequency of the compressor; after the frequency of the compressor is increased, it can ensure that the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than the first preset value, preventing the compressor and the outdoor fan from resonating. Moreover, after this adjustment, the compressor and the outdoor fan will not resonate, shortening the adjustment cycle; ensuring the stability of the operation of the air - conditioning system.

[0034] At this time, only increasing the frequency of the compressor without adjusting the rotational speed of the outdoor fan can ensure that the absolute value of the difference after adjustment will be greater than the first preset value, reducing the adjustment cycle. Moreover, increasing the frequency will also enhance the cooling or heating capacity of the air - conditioning system, guaranteeing the user experience.

[0035] In summary, first adopting the method of adjusting the rotational speed of the outdoor fan for adjustment can reduce the impact on the user experience; then, adopting the method of adjusting the frequency of the compressor for adjustment can shorten the adjustment cycle, avoiding the instability of the operation of the air - conditioning system caused by frequent adjustment, which has a greater impact on the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following describes the preferred embodiments of the present invention with reference to the accompanying drawings, where:

[0037] Figure 1 is a flowchart of the main steps of the control method of the air - conditioning system provided in Embodiment 1 of the present invention;

[0038] Figure 2 It is a flowchart showing the detailed steps of the control method of the air conditioning system provided in the first embodiment of the present invention. Specific Embodiments

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0040] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0042] This embodiment discloses an air conditioning system, which includes an outdoor heat exchanger, a throttling element, and an indoor heat exchanger connected in sequence.

[0043] In this embodiment, the throttling element is specifically an electronic expansion valve; in other embodiments, the throttling element can also be a thermal expansion valve or a two-way throttling valve, etc., as long as it can play the role of regulating the flow rate and throttling.

[0044] This air conditioning system further includes a control module. The throttling element is communicatively connected to the control module. The control module can control the opening degree of the control valve to control the refrigerant flow rate flowing through the throttling element; thereby controlling the cooling or heating capacity of the air conditioning system.

[0045] The air-conditioning system further includes a compressor and a four-way valve. The suction port of the compressor is connected to the first interface of the four-way valve, and the discharge port is connected to the second interface of the four-way valve; the side of the outdoor heat exchanger away from the control valve is connected to the third interface of the four-way valve, and the side of the indoor heat exchanger away from the throttling element is connected to the fourth interface of the four-way valve; by changing the state of the four-way valve, the operating mode of the air-conditioning system is switched. The four-way valve is communicatively connected to the control module, and the control module controls the state of the four-way valve, thereby adjusting the operating mode of the air-conditioning system.

[0046] In addition, the air-conditioning system further includes a gas-liquid separator. The inlet of the gas-liquid separator is connected to the first interface of the four-way valve, and the discharge port of the gas-liquid separator is connected to the suction port of the compressor. The gaseous refrigerant discharged from the gas-liquid separator is sucked in by the compressor. The refrigerant flowing into the gas-liquid separator from the first interface of the four-way valve, where the liquid refrigerant is separated and remains in the gas-liquid separator. Under the action of the subsequent flowing gaseous refrigerant, the liquid refrigerant in the gas-liquid separator absorbs the heat in the gaseous refrigerant and vaporizes, then flows out from the discharge port of the gas-liquid separator, flows into the suction port of the compressor, and is sucked in by the compressor for compression.

[0047] The air-conditioning system further includes a gas-side stop valve and a liquid-side stop valve. The gas-side stop valve is arranged between the fourth interface of the four-way valve and the indoor heat exchanger. The liquid-side stop valve is arranged between the indoor heat exchanger and the throttling element.

[0048] In order to better achieve environmental protection, the refrigerant filled in the air-conditioning system is mostly a combustible refrigerant. When refrigerant leakage occurs on the indoor heat exchanger side, by closing the gas-side stop valve and the liquid-side stop valve, the refrigerant leakage on the outdoor heat exchanger and compressor sides can be effectively avoided, the refrigerant leakage amount can be reduced, and further the occurrence probability of safety accidents can be reduced. Since the refrigerant on the outdoor heat exchanger and compressor sides is retained in the air-conditioning system, when refrigerant is refilled after maintenance, the refrigerant filling amount can be reduced, and the maintenance cost can be lowered. When refrigerant leakage occurs on the outdoor heat exchanger side, by closing the gas-side stop valve and the liquid-side stop valve, the refrigerant leakage on the indoor heat exchanger side can be effectively avoided, and further the occurrence probability of safety accidents can be reduced; since the refrigerant on the indoor heat exchanger side is retained in the air-conditioning system, when refrigerant is refilled after maintenance, the refrigerant filling amount can be reduced, and the maintenance cost can be lowered.

[0049] In the refrigeration mode, the first interface and the fourth interface of the four-way valve are connected, and the second interface and the third interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the second interface and the third interface and then flows to the outdoor heat exchanger, where heat exchange occurs to absorb the cold in the air, reducing the high-temperature refrigerant to a low-temperature refrigerant; after flowing out of the outdoor heat exchanger, it flows through the throttling element and the liquid-side stop valve to the indoor heat exchanger for heat exchange; at the indoor heat exchanger, the low-temperature liquid refrigerant absorbs the heat in the air and vaporizes to cool the indoor environment. After flowing out of the indoor heat exchanger, it flows back to the compressor through the gas-side stop valve, the first interface and the fourth interface of the four-way valve, and the gas-liquid separator for compression again; for the next cycle.

[0050] In the heating mode, the second interface and the fourth interface of the four-way valve are connected, and the first interface and the third interface are connected; the high-temperature and high-pressure refrigerant flowing out of the compressor flows through the second interface and the fourth interface, and then through the gas-side stop valve to the outdoor heat exchanger, where heat exchange occurs in the indoor heat exchanger, and the high-temperature gaseous refrigerant releases heat to heat the indoor environment; after the high-temperature gaseous refrigerant releases heat in the indoor heat exchanger, it becomes a low-temperature liquid refrigerant. The refrigerant flowing out of the indoor heat exchanger flows through the liquid-side stop valve and then to the electronic expansion valve, and then to the outdoor heat exchanger for heat exchange; the low-temperature liquid refrigerant absorbs heat at the outdoor heat exchanger to become a low-temperature gaseous refrigerant. After flowing out of the outdoor heat exchanger, the refrigerant flows back to the compressor through the first interface and the third interface of the four-way valve and the gas-liquid separator for compression again; for the next cycle.

[0051] In the defrosting mode, it operates in the heating mode before the defrosting mode. That is, the high-temperature and high-pressure refrigerant flowing out of the compressor passes through the second interface and the fourth interface, and then flows through the gas-side stop valve to the outdoor heat exchanger for heat exchange in the indoor heat exchanger. The high-temperature gaseous refrigerant releases heat to heat the indoor environment; after the high-temperature gaseous refrigerant releases heat in the indoor heat exchanger, it becomes a low-temperature liquid refrigerant. The refrigerant flowing out of the indoor heat exchanger passes through the liquid-side stop valve and then flows to the electronic expansion valve, and then flows to the outdoor heat exchanger for heat exchange; the low-temperature liquid refrigerant absorbs heat at the outdoor heat exchanger to become a low-temperature gaseous refrigerant. After the refrigerant flows out of the outdoor heat exchanger, it flows back to the compressor through the first interface, the third interface of the four-way valve, and the gas-liquid separator for compression again. Then, it switches to the flow mode of the refrigeration mode for defrosting, that is, the high-temperature and high-pressure refrigerant flowing out of the compressor passes through the second interface and the third interface and then flows to the outdoor heat exchanger for heat exchange to absorb the cold in the air, reducing the high-temperature refrigerant to a low-temperature refrigerant; after flowing out of the outdoor heat exchanger, it passes through the throttling element and the liquid-side stop valve and flows to the indoor heat exchanger for heat exchange; at the indoor heat exchanger, the low-temperature liquid refrigerant absorbs the heat in the air and vaporizes to cool the indoor environment. After flowing out of the indoor heat exchanger, it flows back to the compressor through the gas-side stop valve, the first interface and the fourth interface of the four-way valve, and the gas-liquid separator for compression again. When controlling the refrigerant flow in the defrosting mode according to the refrigeration mode, only the refrigerant flow is controlled, but the outdoor fan and the indoor fan do not operate. The non-operation of the outdoor fan can accelerate the defrosting of the outdoor heat exchanger. Specifically, when the outdoor fan does not operate, the heat at the outdoor heat exchanger will not be carried away by the cold wind outdoors, and the heat released by the refrigerant can be used for defrosting as much as possible, which can accelerate the defrosting speed.

[0052] The non-operation of the indoor fan can ensure a relatively small impact on the indoor temperature, thus ensuring the user experience; since the indoor heat exchanger absorbs the indoor heat at this time, although turning on the indoor fan can accelerate the heat exchange speed of the indoor heat exchanger, it will blow cold air into the room, which has a greater impact on the user experience. Therefore, without turning on the indoor fan, only the air near the indoor heat exchanger will cool down, but without the blowing of the indoor fan, its fluidity is poor; the impact on the temperature of other indoor areas is relatively small, and the user experience can be ensured as much as possible.

[0053] The air-conditioning system further includes a frost amount sensor disposed on the outdoor heat exchanger for detecting whether the outdoor heat exchanger is frosted and the amount of frost on the outdoor heat exchanger. Among them, the frost amount sensor is communicatively connected to the control module. When the frost amount sensor detects the frost amount on the outdoor heat exchanger, it transmits a signal to the control module, and the control module determines whether it reaches a certain thickness. After reaching a certain thickness, the control module controls the air-conditioning system to turn on the defrosting mode for defrosting.

[0054] The air conditioning system further includes a first frequency sensor and a second frequency sensor. The first frequency sensor is disposed on the outdoor fan and is used to detect the vibration frequency of the outdoor fan. The second frequency sensor is disposed on the compressor and is used to detect the frequency of the compressor. The first frequency sensor and the second frequency sensor are both communicatively connected to the control module and can transmit the detected frequency information to the control module. In addition, the frequency of the compressor can be controlled by the driving module of the compressor. Information of the driving module can be obtained, and then the frequency of the compressor can be determined. Since there is a certain error in external detection relative to internal control information, in this embodiment, data of the driving module is selected to determine the frequency of the compressor according to the data of the driving module.

[0055] The control module is further configured to be capable of executing the control method of the air conditioning system, such as Figure 1 shown, the control method includes the following main steps:

[0056] S001. Obtain the frequency of the compressor and the frequency of the outdoor fan;

[0057] S002. Calculate the difference between the frequency of the compressor and the frequency of the outdoor fan;

[0058] S003. Determine the rotational speed of the outdoor fan according to the difference.

[0059] Among them, step S003 "Determine the rotational speed of the outdoor fan according to the difference" includes:

[0060] If the absolute value of the difference is less than a first preset value, the rotational speed of the outdoor fan is adjusted according to the working mode of the air conditioning system.

[0061] When the absolute value of the difference is less than the first preset value, it means that the difference between the frequency of the compressor and the frequency of the outdoor fan is small, and the compressor and the outdoor fan are very likely to resonate, resulting in excessive noise of the outdoor unit, and in severe cases, it will be transmitted to the indoor unit side through the pipeline, resulting in a poor user experience. When the absolute value of the difference is less than the first preset value, adjusting the rotational speed of the outdoor fan can change the vibration frequency of the outdoor fan, and further increase the absolute value of the difference to avoid resonance between the two.

[0062] In addition, when the absolute value of the difference is less than the first preset value, the rotational speed of the outdoor fan is adjusted first. Although the adjustment of the rotational speed of the outdoor fan will affect the heating or cooling effect, the impact is small, and the impact on the user experience is relatively small compared to adjusting the frequency of the compressor. Therefore, the method of adjusting the rotational speed of the outdoor fan is adopted first for adjustment.

[0063] Specifically, "Adjust the rotational speed of the outdoor fan according to the working mode of the air conditioning system" specifically includes:

[0064] If the air conditioning system is in the heating mode, the rotational speed of the outdoor fan is reduced. The amount of reduction in the rotational speed of the outdoor fan is determined according to the current rotational speed of the outdoor fan. Specifically, the rotational speed of the outdoor fan is reduced by a first preset rotational speed, and the first preset rotational speed is determined according to the current rotational speed of the outdoor fan. Specifically, the mapping relationship between the first preset rotational speed and the rotational speed of the outdoor fan can be determined through experiments, or data simulation can be performed according to a digital model, and regression analysis can be carried out to obtain it.

[0065] Although in this embodiment, the rotational speed of the outdoor fan is reduced by the first preset rotational speed, this is not a limitation on the present invention. On the premise of not deviating from the principle of the present invention, in other embodiments, the rotational speed of the outdoor fan can be reduced by a first preset percentage value, where the first preset percentage value is determined according to the current rotational speed of the outdoor fan. Specifically, the mapping relationship between the first preset percentage value and the rotational speed of the outdoor fan can be determined through experiments, or data simulation can be performed according to a digital model, and regression analysis can be carried out to obtain it. All of these do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0066] Reducing the rotational speed of the outdoor fan can reduce the energy consumption of the air conditioning system. Although reducing the rotational speed of the outdoor fan may cause a slight reduction in the heating capacity, the reduction in the heating capacity is very small and will not have a substantial impact on the user's experience. Therefore, it is preferred to reduce the rotational speed of the outdoor fan to reduce the overall energy consumption of the air conditioning system. In addition, by determining the amount of reduction in the rotational speed of the outdoor fan in the above manner, after the rotational speed of the outdoor fan is reduced, the absolute value of the difference between the frequency of the outdoor fan and the frequency of the compressor can be increased as much as possible, avoiding readjustment.

[0067] "Adjusting the rotational speed of the outdoor fan according to the operating mode of the air conditioning system" includes:

[0068] If the air conditioning system is in the cooling mode, the rotational speed of the outdoor fan is increased. The amount of increase in the rotational speed of the outdoor fan is determined according to the current rotational speed of the outdoor fan. Specifically, the rotational speed of the outdoor fan is increased by a second preset rotational speed, and the second preset rotational speed is determined according to the current rotational speed of the outdoor fan. Specifically, the mapping relationship between the second preset rotational speed and the rotational speed of the outdoor fan can be determined through experiments, or data simulation can be performed according to a digital model, and regression analysis can be carried out to obtain it.

[0069] Although in this embodiment, the rotational speed of the outdoor fan increases by a second preset rotational speed, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, the rotational speed of the outdoor fan can be increased by a second preset proportional value, where the second preset proportional value is determined according to the current rotational speed of the outdoor fan. Specifically, the mapping relationship between the second preset proportional value and the rotational speed of the outdoor fan can be determined through experiments, or data simulation can be performed based on a digital model and regression analysis can be carried out to obtain it. These do not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0070] When the rotational speed of the outdoor fan increases, the heat exchange capacity of the outdoor heat exchanger can be enhanced, the heat released by the outdoor heat exchanger increases, the temperature of the refrigerant flowing to the indoor heat exchanger decreases, the heat exchange capacity of the indoor heat exchanger is enhanced, ensuring sufficient cooling capacity indoors and guaranteeing the user experience. In addition, by determining the increase in the rotational speed of the outdoor fan in the above manner, after the rotational speed of the outdoor fan decreases, the absolute value of the difference between the frequency of the outdoor fan and the frequency of the compressor can be increased as much as possible, avoiding re-regulation.

[0071] After adjusting the rotational speed of the outdoor fan, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan.

[0072] Among them, "after adjusting the rotational speed of the outdoor fan, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" specifically includes:

[0073] After the rotational speed of the outdoor fan is adjusted and operates for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than a second preset value, the outdoor fan maintains its current rotational speed; where the second preset value is greater than the first preset value.

[0074] The absolute value of the difference being greater than the second preset value means that the difference between the frequency of the compressor and the frequency of the outdoor fan is large, and the compressor and the outdoor fan will not resonate and will not generate excessive noise. Since the vibration frequency of the outdoor fan is mainly affected by the rotational speed of the outdoor fan, but other aspects will also affect the vibration frequency. Moreover, after the rotational speed of the outdoor fan is adjusted, the vibration frequency of the outdoor fan is not very stable. Therefore, when the absolute value of the difference is greater than the second preset value, maintaining the current state of operation can avoid generating errors.

[0075] In addition, "after adjusting the rotational speed of the outdoor fan, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" also includes the following detailed steps:

[0076] After the outdoor fan runs at an adjusted speed for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, the outdoor fan maintains its current speed and the frequency of the compressor is adjusted. Specifically, the frequency of the compressor is increased; and the increase value of the compressor frequency is specifically determined according to the magnitudes of the compressor frequency and the outdoor fan frequency. When the compressor frequency is greater than the outdoor fan frequency, the compressor frequency is increased by the first preset value; when the compressor frequency is less than the outdoor fan frequency, the compressor frequency is increased by twice the first preset value. After the compressor frequency is increased, it can ensure that the difference between the compressor frequency and the outdoor fan frequency is greater than the first preset value, so that the compressor and the outdoor fan will not resonate. Moreover, after this adjustment, the compressor and the outdoor fan will not resonate, shortening the adjustment period; ensuring the stability of the air-conditioning system operation.

[0077] At this time, only the frequency of the compressor is increased without adjusting the speed of the outdoor fan, which can ensure that the absolute value of the difference after adjustment will be greater than the first preset value, reducing the adjustment period. Moreover, increasing the frequency will also enhance the cooling or heating capacity of the air-conditioning system, ensuring the user experience.

[0078] First, adjusting the speed of the outdoor fan can reduce the impact on the user experience; then, adjusting the compressor frequency can shorten the adjustment period, avoiding frequent adjustments that may make the air-conditioning system operate unstably and have a greater impact on the user experience.

[0079] "After adjusting the speed of the outdoor fan, determining the speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" also includes the following detailed steps:

[0080] After the outdoor fan runs at an adjusted speed for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is not less than the first preset value and not greater than the second preset value, continue to run for the first preset duration in the current state. After the operation is completed, judge the relationship between the absolute value of the difference and the first preset value and the second preset value again.

[0081] After the outdoor fan runs at an adjusted speed for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value,

[0082] As Figure 2 shown, the control method of this air-conditioning system includes the following detailed steps:

[0083] S01. Obtain the frequency of the compressor and the frequency of the outdoor fan;

[0084] S02. Calculate the difference between the frequency of the compressor and the frequency of the outdoor fan;

[0085] S03. Determine whether the absolute value of the difference is less than the first preset value. If so, proceed to step S04;

[0086] S04. Determine whether the air conditioning system is in the heating mode; if so, reduce the rotational speed of the outdoor fan; and proceed to step S06 after the first preset duration; if not, proceed to step S05;

[0087] S05. Determine whether the air conditioning system is in the cooling mode; if so, increase the rotational speed of the outdoor fan; and proceed to step S06 after the first preset duration;

[0088] S06. Obtain the frequency of the compressor and the frequency of the outdoor fan;

[0089] S07. Calculate the difference between the frequency of the compressor and the frequency of the outdoor fan;

[0090] S08. Determine whether the absolute value of the difference is less than the first preset value. If so, proceed to step S010; if not, proceed to step S09;

[0091] S09. Determine whether the absolute value of the difference is greater than the second preset value. If so, operate in the current state; if not, operate in the current state for the first preset duration and then proceed to step S06 again.

[0092] S010. Determine whether the frequency of the compressor is greater than the frequency of the outdoor fan; if so, increase the frequency of the compressor by the first preset value; if not, increase the frequency of the compressor by twice the first preset value.

[0093] Embodiment 2

[0094] This embodiment discloses a control method for an air conditioning system, which is basically the same as the control method in Embodiment 1.

[0095] The difference lies in that "after the rotational speed of the outdoor fan is adjusted and operated for the first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, the outdoor fan maintains the current rotational speed and the frequency of the compressor is adjusted".

[0096] In this embodiment, "after adjusting the rotational speed of the outdoor fan, determining the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes: after the rotational speed of the outdoor fan is adjusted and operates for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than a first preset value, the outdoor fan returns to the initial rotational speed, and the frequency of the compressor is adjusted. Herein, the initial rotational speed refers to the rotational speed before the first adjustment. And the frequency of the compressor increases. The specific increase value of the frequency of the compressor is determined according to the magnitudes of the frequency of the compressor and the frequency of the outdoor fan. When the frequency of the compressor is greater than the initial frequency of the outdoor fan, the frequency of the compressor increases by a first preset value; when the frequency of the compressor is less than the initial frequency of the outdoor fan, the frequency of the compressor increases by twice the first preset value. After the frequency of the compressor increases, it can ensure that the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than the first preset value, so that the compressor and the outdoor fan will not generate resonance. Moreover, after this adjustment, resonance between the compressor and the outdoor fan can be avoided, shortening the adjustment period; and the stability of the air-conditioning system operation is ensured.

[0097] At this time, only increasing the frequency of the compressor and restoring the rotational speed of the outdoor fan to the initial rotational speed can ensure that the absolute value of the difference after adjustment will be greater than the first preset value, reducing the adjustment period. Moreover, increasing the frequency will also enhance the refrigeration or heating capacity of the air-conditioning system, ensuring the user experience.

[0098] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning system, characterized in that, The air conditioning system includes a compressor and an outdoor fan, and the control method includes: Determine the rotational speed of the outdoor fan according to the difference between the frequency of the compressor and the frequency of the outdoor fan.

2. The control method according to claim 1, characterized in that, "Determine the rotational speed of the outdoor fan according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes: If the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than a first preset value, then adjust the rotational speed of the outdoor fan according to the operating mode of the air conditioning system.

3. The control method according to claim 2, wherein "Adjust the rotational speed of the outdoor fan according to the operating mode of the air conditioning system" includes: If the air conditioning system is in the heating mode, then reduce the rotational speed of the outdoor fan; preferably, the reduction amount of the rotational speed of the outdoor fan is determined according to the current rotational speed of the outdoor fan; and / or If the air conditioning system is in the cooling mode, then increase the rotational speed of the outdoor fan; preferably, the increase amount of the rotational speed of the outdoor fan is determined according to the current rotational speed of the outdoor fan.

4. The control method according to claim 2, characterized in that After the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan.

5. The control method according to claim 4, characterized in that, "After the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes: After the rotational speed adjustment of the outdoor fan runs for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is greater than a second preset value, then the outdoor fan runs at the current rotational speed; wherein, the second preset value is greater than the first preset value.

6. The control method according to claim 4, wherein "After the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes: After the rotational speed adjustment of the outdoor fan runs for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, then the outdoor fan resumes to the initial rotational speed and adjusts the frequency of the compressor; Preferably, "adjust the frequency of the compressor" includes: increasing the frequency of the compressor.

7. The control method according to claim 6, characterized in that The increased value of the frequency of the compressor is determined according to the frequency of the compressor and the frequency of the outdoor fan; Preferably, when the frequency of the compressor is greater than the frequency of the outdoor fan, the frequency of the compressor is increased by the first preset value; When the frequency of the compressor is less than the frequency of the outdoor fan, then the frequency of the compressor is increased by 2× the first preset value.

8. The control method according to claim 4, characterized in that "After the rotational speed of the outdoor fan is adjusted, determine the rotational speed of the outdoor fan and / or the frequency of the compressor according to the difference between the frequency of the compressor and the frequency of the outdoor fan" includes: After the rotational speed adjustment of the outdoor fan runs for a first preset duration, if the absolute value of the difference between the frequency of the compressor and the frequency of the outdoor fan is less than the first preset value, then the outdoor fan runs at the current rotational speed and adjusts the frequency of the compressor. Preferably, "adjusting the frequency of the compressor" includes: increasing the frequency of the compressor.

9. The control method according to claim 8, wherein The increased value of the frequency of the compressor is determined according to the frequency of the compressor and the frequency of the outdoor fan; Preferably, when the compressor frequency is greater than the initial frequency of the outdoor fan, the frequency of the compressor is increased by the first preset value; When the compressor frequency is less than the initial frequency of the outdoor fan, the frequency of the compressor is increased by 2 × the first preset value.

10. An air conditioning system, characterized in that, It includes a control module, and the control module is configured to be capable of executing the control method of the air conditioning system according to any one of claims 1-9.

Images