Control method of air conditioner

Abstract

The invention relates to the technical field of air conditioners, particularly provides a control method of an air conditioner, and aims to solve the problem that in the prior art, when an air pipe machine runs in a refrigeration mode, the air supply amount is attenuated, and the refrigeration effect is affected. In order to achieve the purpose, the control method comprises the steps that when the air conditioner operates in a refrigeration mode, whether the air supply amount of an indoor unit is attenuated or not is judged; selectively adjusting operation parameters and / or operation modes of the air conditioner based on the first judgment result; wherein the operation parameters of the air conditioner at least comprise one of the rotating speed of an outdoor fan, the air speed of an indoor fan, the operation frequency of a compressor, the opening degree of an electronic expansion valve and the opening and closing states of a first guide plate and a second guide plate. By adjusting the operation parameters and the operation mode of the air conditioner, the air supply volume of the air conditioner is always kept at the normal air volume, so that a good refrigeration effect is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides a control method for an air conditioner. Background Art

[0002] Ducted air conditioners are widely popular due to their advantages such as affordable price, easy installation, space saving, and good decoration effect, and are increasingly widely used. Ducted air conditioners are usually installed near the ceiling. When the ducted air conditioner is operating, the air in the indoor space enters the air conditioner through the lower air inlet and then blows out through the air outlet provided on the side. Moreover, ducted air conditioners usually adopt medium-high static pressure fans, and the air pressure at the air outlet is usually relatively high, which can quickly make the indoor air flow evenly, and then make the temperature evenly distributed throughout the indoor space.

[0003] However, when the ducted air conditioner operates in the cooling mode in summer, after a long operation time, the air supply volume of the ducted air conditioner will attenuate, thereby affecting the cooling capacity output by the ducted air conditioner and the cooling effect.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the air supply volume of the ducted air conditioner attenuates during operation in the cooling mode in the prior art, affecting the cooling effect.

[0006] The present invention provides a control method for an air conditioner. The air conditioner includes an indoor unit and an outdoor unit. The outdoor unit includes an outdoor fan, a compressor, and an electronic expansion valve. The indoor unit includes a casing and an indoor fan disposed inside the casing. The casing has an air inlet and an air outlet, and a duct is formed between the air inlet and the air outlet. A first guide plate is provided at the air inlet, and a second guide plate is provided at the air outlet. The first guide plate is configured to be able to open or close the air inlet, and the second guide plate is configured to be able to open or close the air outlet.

[0007] The control method includes:

[0008] When the air conditioner operates in the cooling mode, determining whether the air supply volume of the indoor unit has attenuated;

[0009] Based on the first determination result, selectively adjusting the operating parameters and / or operating mode of the air conditioner;

[0010] Wherein, the operating parameters of the air conditioner at least include one of the rotation speed of the outdoor fan, the air speed of the indoor fan, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the opening and closing states of the first guide plate and the second guide plate.

[0011] In the preferred technical solution of the above control method, the step of "selectively adjusting the operating parameters and / or operating mode of the air conditioner based on the first judgment result" further includes:

[0012] When the air supply volume of the indoor unit has attenuated, obtain the wind speed of the indoor fan;

[0013] Judge whether the wind speed is the highest wind speed;

[0014] Adjust the operating parameters and / or operating mode of the air conditioner based on the second judgment result.

[0015] In the preferred technical solution of the above control method, the step of "selectively adjusting the operating parameters and / or operating mode of the air conditioner based on the second judgment result" further includes:

[0016] If the wind speed is not the highest wind speed, increase the wind speed of the indoor fan;

[0017] If the wind speed is the highest wind speed, adjust the operating frequency of the compressor and / or the opening degree of the electronic expansion valve.

[0018] In the preferred technical solution of the above control method, the step of "adjusting the operating frequency of the compressor and / or the opening degree of the electronic expansion valve" further includes:

[0019] Reduce the operating frequency of the compressor and decrease the opening degree of the electronic expansion valve;

[0020] While or after controlling the compressor to operate at the reduced operating frequency and the electronic expansion valve to operate at the reduced opening degree, obtain the pressure of the refrigerant system, and adjust the operating frequency of the compressor and the opening degree of the electronic expansion valve according to the pressure.

[0021] In the preferred technical solution of the above control method, the step of "adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve according to the pressure" further includes:

[0022] If the pressure is less than or equal to the first pressure threshold, or the pressure is greater than or equal to the second pressure threshold, adjust the operating parameters of the air conditioner according to the fuzzy control rule;

[0023] If the pressure is greater than the first pressure threshold and less than the second pressure threshold, continue to control the compressor to operate at the reduced operating frequency and the electronic expansion valve to operate at the reduced opening degree.

[0024] In the preferred technical solution of the above control method, the control method further includes:

[0025] After adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve for a first preset time, adjust the operating parameters of the air conditioner according to the fuzzy control rule, and determine again whether the air supply volume of the indoor unit has still decreased;

[0026] When the air supply volume of the indoor unit still decreases, adjust the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the rotational speed of the outdoor fan, the air speed of the indoor fan, and / or the operating mode of the air conditioner.

[0027] In a preferred technical solution of the above control method, the step of "adjusting the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the air speed of the indoor fan, and / or the operating mode of the air conditioner" further includes:

[0028] Control the first guide plate and the second guide plate to close, control the compressor and the outdoor fan to stop operating, and control the indoor fan to operate at the highest air speed.

[0029] In a preferred technical solution of the above control method, the indoor unit further includes an indoor heat exchanger disposed in the housing, and a pressure sensor is disposed in the air duct near the air outlet.

[0030] The control method further includes:

[0031] After controlling the first guide plate and the second guide plate to close, controlling the compressor and the outdoor fan to stop operating, and controlling the indoor fan to operate at the highest air speed for a second preset time, adjust the operating parameters of the air conditioner according to the fuzzy control rule, and determine again whether the air supply volume of the indoor unit has still decreased;

[0032] When the air supply volume of the indoor unit still decreases, control the first guide plate and the second guide plate to close, adjust the operating mode of the air conditioner to the heating mode, detect the air pressure through the pressure sensor, when the air pressure is greater than or equal to the preset air pressure, control the operating mode of the air conditioner to be adjusted back to the cooling mode, and then when the air outlet temperature at the air outlet is less than the indoor ambient temperature, control the first guide plate and the second guide plate to open.

[0033] In a preferred technical solution of the above control method, the indoor unit further includes an indoor heat exchanger disposed in the housing, and a pressure sensor is disposed in the air duct near the air outlet.

[0034] The step of "adjusting the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the air speed of the indoor fan, and / or the operating mode of the air conditioner" further includes:

[0035] Control the first guide plate and the second guide plate to close, and adjust the operation mode of the air conditioner to the heating mode;

[0036] Detect the wind pressure through the pressure sensor, and when the wind pressure is greater than or equal to the preset wind pressure, control the operation mode of the air conditioner to be adjusted back to the cooling mode;

[0037] Obtain the air outlet temperature and the indoor ambient temperature at the air outlet, and when the air outlet temperature is lower than the indoor ambient temperature, control the first guide plate and the second guide plate to open.

[0038] In a preferred technical solution of the above control method, the indoor unit further includes an indoor heat exchanger disposed in the casing, the indoor heat exchanger is disposed downstream of the indoor fan along the air flow direction, and a pressure sensor is disposed in the air duct near the air outlet,

[0039] The step of "judging whether the air supply volume of the indoor unit has decreased" further includes:

[0040] Detect the wind pressure through the pressure sensor;

[0041] When the wind pressure is less than the preset wind pressure, it is determined that the air supply volume of the indoor unit has decreased; or

[0042] The indoor unit further includes an indoor heat exchanger disposed in the casing, the indoor heat exchanger is disposed upstream of the indoor fan along the air flow direction,

[0043] The step of "judging whether the air supply volume of the indoor unit has decreased" further includes:

[0044] Obtain the temperature of the motor of the indoor fan;

[0045] When the temperature of the motor is greater than the preset temperature, it is determined that the air supply volume of the indoor unit has decreased.

[0046] In the technical solution of the present invention, when the air conditioner operates in the cooling mode, it judges whether the air supply volume of the indoor unit has attenuated, and then selectively adjusts the operating parameters and operating mode of the air conditioner based on the first judgment result, so that the air supply volume is always at a normal air volume. Among them, the operating parameters of the air conditioner at least include one of the rotational speeds of the outdoor fan and the indoor fan, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the opening and closing states of the first guide plate and the second guide plate. That is to say, this application will detect the air supply volume of the indoor unit in real time when the air conditioner operates in the cooling mode, and then adjust the operating parameters and operating mode of the air conditioner in a timely manner according to the first judgment result, removing the factors affecting the air supply volume of the air conditioner, so that the air supply volume of the air conditioner is always at a normal air volume, thereby ensuring a good cooling effect.

[0047] When the air supply volume of the indoor unit has attenuated, first judge whether the wind speed of the indoor fan is the highest wind speed. If the wind speed of the indoor fan is not the highest wind speed, then increase the wind speed of the indoor fan, and blow away the condensed water accumulated on the indoor heat exchanger through a large air volume, so as to avoid affecting the air supply volume due to excessive condensed water and make the air supply volume return to the normal air volume as soon as possible. If the wind speed of the indoor fan is already the highest wind speed, then at this time, adjust the operating frequency of the compressor and the opening degree of the electronic expansion valve. By adjusting the compressor and the electronic expansion valve, reduce the refrigerant circulation volume, so that the amount of refrigerant entering the indoor heat exchanger per unit time is reduced, which can also reduce the condensed water accumulated on the indoor heat exchanger. At the same time, supplemented by the indoor fan operating at the highest wind speed, it can quickly blow away the condensed water accumulated on the indoor heat exchanger, so as to avoid affecting the air supply volume due to excessive condensed water and make the air supply volume return to the normal air volume as soon as possible.

[0048] After adjusting the operating frequency of the compressor and the electronic expansion valve for the first preset time, adjust the operating parameters of the air conditioner according to the fuzzy control rule, that is, make the air conditioner operate according to the parameters before adjustment, and judge again whether the air supply volume of the indoor fan has returned to the normal air volume. If the air supply volume still shows attenuation, it means that the above adjustments to the compressor and the electronic expansion valve have not solved the problem of air volume attenuation. At this time, close the first guide plate and the second guide plate, stop the compressor, and make the indoor fan operate at the highest wind speed to maximize the removal of the condensed water on the indoor heat exchanger, so as to avoid affecting the air supply volume of the indoor unit due to the presence of condensed water and make the air supply volume return to the normal air volume as soon as possible.

[0049] After the foregoing control operation lasts for the second preset time, adjust the operating parameters of the air conditioner according to the fuzzy control rules, that is, make the air conditioner operate according to the parameters before adjustment, and determine again whether the air supply volume of the indoor fan has returned to the normal air volume. If the air supply volume still decays, it indicates that the foregoing adjustments to the compressor and the electronic expansion valve do not solve the problem of air volume decay. At this time, keep the first guide plate and the second guide plate closed, control the compressor and the outdoor fan to start running, and adjust the operating mode of the air conditioner to the heating mode to increase the surface temperature of the indoor heat exchanger, avoid the accumulation of condensed water, and be able to evaporate the condensed water on the surface of the indoor heat exchanger to dry the surface of the indoor heat exchanger. When the air pressure at the air outlet is greater than or equal to the preset air pressure, adjust the operating mode of the air conditioner back to the cooling mode, and control the first guide plate and the second guide plate to open when the air outlet temperature is lower than the indoor ambient temperature. At this time, there is no condensed water on the indoor heat exchanger, and the air supply volume output under the action of the indoor fan also reaches the normal air volume, that is, the air conditioner returns to the normal cooling mode and can provide sufficient cooling capacity to ensure the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The preferred embodiments of the present invention will be described below by taking a ducted air conditioner as an example in conjunction with the drawings, in which:

[0051] Figure 1 is a schematic structural diagram (I) of the indoor unit of a ducted air conditioner according to an embodiment of the present invention;

[0052] Figure 2 is a schematic structural diagram (II) of the indoor unit of a ducted air conditioner according to an embodiment of the present invention;

[0053] Figure 3 is a flowchart of a control method according to an embodiment of the present invention;

[0054] Figure 4 is a control flowchart for adjusting the wind speed of the indoor fan when the air supply volume decays according to an embodiment of the present invention;

[0055] Figure 5 is a control flowchart for adjusting the operating mode of the ducted air conditioner when the air supply volume decays according to an embodiment of the present invention.

[0056] List of reference signs:

[0057] 1. Housing; 11. Air inlet; 12. Air outlet; 13. First guide plate; 14. Second guide plate; 2. Indoor fan; 3. Indoor heat exchanger; 4. Pressure sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] 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. It should be noted that although the air duct machine is taken as an example in this embodiment for illustration, it can obviously also be used in other types of air conditioners such as wall-mounted air conditioners and cabinet air conditioners.

[0059] It should be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms "connected" and "joined" 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 a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0060] Currently, when the air duct machine operates in the cooling mode in summer, after a long operation time, the air supply volume is likely to decay, thereby affecting the cooling effect. For this reason, when the air duct machine of the present invention operates in the cooling mode, once the air supply volume decays, the operating parameters and operating mode of the air duct machine are adjusted to eliminate the factors affecting the air supply volume of the air conditioner, thereby ensuring the cooling effect.

[0061] As Figure 1 and Figure 2 shown, the air duct machine includes an indoor unit and an outdoor unit (not shown). The outdoor unit includes a compressor, an outdoor fan, an outdoor heat exchanger, and an electronic expansion valve. The indoor unit includes a housing 1, an indoor fan 2 and an indoor heat exchanger 3 arranged in the housing 1. The refrigerant of the refrigerant system circulates between the compressor, the outdoor heat exchanger, the electronic expansion valve, and the indoor heat exchanger 3 through the refrigerant pipeline. The housing 1 has an air inlet 11 and an air outlet 12. A first guide plate 13 is arranged at the air inlet 11, and a second guide plate 14 is arranged at the air outlet 12. A first driving motor and a second driving motor are configured in the indoor unit. The power output end of the first driving motor is connected to the first guide plate, and the power output end of the second driving motor is connected to the second guide plate. When the first driving motor operates, it can drive the first guide plate 13 to open or close, thereby opening or closing the air inlet 11. When the second driving motor operates, it can drive the second guide plate 14 to open or close, thereby opening or closing the air outlet 12. When the first guide plate 13 and the second guide plate 14 are opened, the air in the indoor space enters the housing through the air inlet 11 under the action of the indoor fan, exchanges heat with the indoor heat exchanger, and returns to the indoor space through the air outlet 12 after being heated or cooled, so as to achieve the purpose of heating or cooling.

[0062] It should be noted thatFigure 1 and Figure 2 The first guide plate 13 and the second guide plate 14 shown in Figure 2 are arranged as louvers. Obviously, the first guide plate 13 and the second guide plate 14 may not be louvers, but may be arranged in other possible forms such as a plate structure, as long as the air inlet 11 and the air outlet 12 can be opened or closed through the first guide plate 13 and the second guide plate 14.

[0063] A pressure sensor 4 is arranged in the air duct of the air duct machine of the present invention near the air outlet 12, and the pressure sensor 4 is used to detect the air pressure at the air outlet.

[0064] It should be noted that the pressure sensor 4 is usually composed of a pressure-sensitive element and a signal processing unit, and it can be but not limited to a strain type pressure sensor, a piezoelectric pressure sensor, a capacitive pressure sensor, a ceramic pressure sensor, a sapphire pressure sensor, etc.

[0065] In the present invention, the indoor unit is further configured with a first temperature sensor and a second temperature sensor. Among them, the first temperature sensor is arranged near the air outlet and is used to detect the air outlet temperature at the air outlet, and the second temperature sensor is arranged near the air inlet of the air duct machine and is used to detect the ambient temperature of the indoor space.

[0066] It should be noted that the first temperature sensor and the second temperature sensor can be but not limited to a thermal resistor, a thermocouple, etc. Among them, the thermal resistor is made of a semiconductor material, and its resistance value changes with the change of temperature. The thermocouple is composed of two different metal wires connected at one end. When one end of the thermocouple is heated, there is a potential difference in the thermocouple circuit, and then the thermocouple temperature is obtained through voltage-temperature conversion. In this embodiment, the specific types of the first temperature sensor and the second temperature sensor are not limited, as long as the air outlet temperature at the air outlet and the ambient temperature of the indoor space can be detected respectively.

[0067] In the present invention, the air duct machine further includes a control module, which is connected to the indoor unit and the outdoor unit of the air duct machine, the first temperature sensor, the second temperature sensor, and the pressure sensor, and can adjust the operating parameters and operating mode of the air conditioner when the air supply volume of the indoor unit decreases, so as to restore the air supply volume of the indoor unit to the normal air volume.

[0068] It should be noted that physically, this control module can be a control chip possessed by the air duct machine itself, or a controller specifically used to execute the method of the present application, or also a functional module or functional unit of a general controller.

[0069] Next, in combination with Figures 1 to 5 to elaborate on possible implementation manners of the control method of the present invention.

[0070] Such asFigure 3 As shown, in a possible implementation, the control method of the present invention includes:

[0071] S100: When the air duct machine operates in the cooling mode, determine whether the air supply volume of the indoor unit has decreased;

[0072] S101: Selectively adjust the operating parameters and operating mode of the air duct machine based on the first judgment result.

[0073] In S100, when the air duct machine operates in the cooling mode, air exchanges heat with the indoor heat exchanger, and the indoor heat exchanger absorbs heat. Moisture in the air will condense into condensate and accumulate on the surface of the indoor heat exchanger. After a long operation time, the condensate accumulated on the indoor heat exchanger will increase. When there is too much condensate on the indoor heat exchanger, it will cause an increase in wind resistance, which in turn leads to a decrease in the air supply volume of the indoor unit. In order to ensure the cooling capacity, it is then determined whether the air supply volume of the indoor unit has decreased.

[0074] As Figure 1 shown, along the air flow direction, the indoor heat exchanger 3 is arranged on the downstream side of the indoor fan 2. At this time, the wind pressure at the air outlet 12 is detected by the above-mentioned pressure sensor 4. Compare this wind pressure with the preset wind pressure. If this wind pressure is less than the preset wind pressure, it means that the current wind pressure is on the low side and the air supply volume of the indoor unit has decreased. It should be noted that the preset wind pressure is the wind pressure when the air duct machine operates normally under the same working conditions, which can be understood as the wind pressure when there is no condensate on the indoor heat exchanger under the same working conditions.

[0075] As Figure 2 shown, along the air flow direction, the indoor heat exchanger 3 is arranged on the upstream side of the indoor fan 2. At this time, obtain the temperature of the motor of the indoor fan, compare this temperature with the preset temperature. If this temperature is greater than the preset temperature, it means that the current suction resistance is relatively large and the temperature of the motor of the indoor fan has risen. Since the indoor heat exchanger 3 is arranged on the upstream side of the indoor fan 2, then the reason for the increase in suction resistance should be that there is too much condensate accumulated on the indoor heat exchanger 3. And when the air volume becomes small, the heat dissipation of the indoor fan 2 itself will also become poor. This also means that the air supply volume of the indoor unit is smaller than the normal air supply volume and has decreased. It should be noted that the preset temperature is the temperature of the motor of the indoor fan when the air duct machine operates normally under the same working conditions, which can be understood as the temperature of the motor of the indoor fan when there is no condensate on the indoor heat exchanger under the same working conditions.

[0076] Obviously, other possible ways can also be used to determine whether the air supply volume of the indoor unit has decreased. Without departing from the basic principle of the present application, those skilled in the art can flexibly select a specific judgment method according to the specific application scenario, as long as it can accurately determine whether the air supply volume of the indoor unit has decreased.

[0077] In S101, based on the first judgment result in S100, the operation parameters and operation mode of the air duct machine are selectively adjusted. For example, when the air supply volume has not decayed, the air duct machine is controlled to continue operating with the current parameters. When the air supply volume has decayed, the operation parameters and operation mode of the air duct machine are adjusted so that the air supply volume of the indoor unit is always maintained at the normal air volume.

[0078] Obviously, based on the first judgment result, it is also possible to only adjust the operation parameters or operation mode of the air conditioner.

[0079] Through the above control method, based on the first judgment result of whether the air supply volume has decayed, the operation parameters and operation mode are selectively adjusted. When there is condensate accumulated on the indoor heat exchanger of the air duct machine, it is blown away to avoid the formation of wind resistance due to the presence of condensate. When there is no condensate on the indoor heat exchanger, the existing operation state is maintained, so that the air supply volume of the indoor unit is always maintained at the normal air volume, and thus it is possible to ensure that the indoor unit provides sufficient cooling capacity and ensure the cooling effect.

[0080] When the air supply volume has decayed, the air supply volume is restored to the normal air volume by adjusting the operation parameters and operation mode of the air duct machine. The following will Figure 4 and Figure 5 be used to specifically elaborate on the possible implementation manners of adjusting the operation parameters and operation mode of the air duct machine in this application.

[0081] As Figure 4 shown, in a possible implementation manner, the control method of the present invention further includes:

[0082] S200: When the air supply volume has decayed, obtain the wind speed of the indoor fan;

[0083] S201: Determine whether the wind speed is the maximum wind speed. If so, execute S203. If not, execute S202;

[0084] S202: Increase the wind speed of the indoor fan;

[0085] S203: Reduce the operating frequency of the compressor to the minimum operating frequency and reduce the opening degree of the electronic expansion valve to the minimum opening degree;

[0086] S204: Obtain the pressure of the refrigerant system;

[0087] S205: Determine whether the pressure is greater than the first pressure threshold and less than the second pressure threshold. If so, return to execute S204. If not, execute S206;

[0088] S206: Adjust the operation parameters of the air duct machine according to the fuzzy control rules.

[0089] In S200, when the air supply volume decays, obtain the wind speed of the indoor fan.

[0090] In this embodiment, the wind speed of the indoor fan includes three gears: low wind gear, medium wind gear, and high wind gear, and the wind speeds of the low wind gear, medium wind gear, and high wind gear increase gradually. Obviously, the wind speed of the indoor fan can also include four or five or other numbers of gears. Of course, the wind speed of the indoor fan can also be not distinguished by gears.

[0091] In S201, based on the wind speed obtained in S200, determine whether the wind speed is the highest wind speed.

[0092] If the current wind speed is not the highest wind speed, at this time, increase the wind speed of the indoor fan. For example, if the current wind speed is in the medium wind gear, then adjust the wind speed of the indoor fan to the high wind gear, that is, execute S202. Blow away the condensed water accumulated on the indoor heat exchanger through a large air volume, so as to prevent the air supply volume from being affected by excessive condensed water and make the air supply volume return to the normal air volume as soon as possible.

[0093] If the current wind speed is already the highest wind speed and the wind speed of the indoor fan cannot be increased anymore, at this time, reduce the operating frequency of the compressor to the lowest operating frequency and reduce the opening degree of the electronic expansion valve to the minimum opening degree. For example, reduce the operating frequency of the compressor to 25HZ and reduce the opening degree of the electronic expansion valve to 20pls, that is, execute S203. In this way, the circulation amount of the refrigerant can be reduced, the amount of refrigerant entering the indoor heat exchanger per unit time can be reduced, and further the condensed water accumulated on the indoor heat exchanger can be reduced. It should be noted that pls is the unit of the opening degree of the electronic expansion valve. For example, the opening degree range of the electronic expansion valve is 0-480pls.

[0094] It should be noted that it is also possible to only reduce the operating frequency of the compressor to the lowest operating frequency, or only reduce the opening degree of the electronic expansion valve to the minimum opening degree. Obviously, when the wind speed of the indoor fan is already the highest wind speed, it is also possible to reduce the operating frequency of the compressor to an operating frequency other than the lowest operating frequency, such as 30HZ, etc. It is also possible to reduce the opening degree of the electronic expansion valve to an opening degree other than the minimum opening degree, such as 25pls, etc.

[0095] In S204, after reducing the operating frequency of the compressor to the lowest operating frequency and reducing the opening degree of the electronic expansion valve to the minimum opening degree, obtain the pressure of the refrigerant system. It should be noted that the refrigerant system is usually equipped with a pressure detection module, and the pressure of the refrigerant system can be monitored in real time through this pressure detection module.

[0096] Obviously, it is also possible to obtain the pressure of the refrigerant system while reducing the operating frequency of the compressor to the lowest operating frequency and reducing the opening degree of the electronic expansion valve to the minimum opening degree.

[0097] In S205, based on the pressure detected in S204, it is determined whether the pressure is greater than the first pressure threshold and less than the second pressure threshold.

[0098] If the pressure is greater than the first pressure threshold and less than the second pressure threshold, for example, the pressure detected in S204 is 1.0 MPa, the first pressure threshold is 0.85 MPa, and the second pressure threshold is 3.0 MPa. In this case, it indicates that the refrigerant system pressure is normal, and it can continue to operate in the current state. At the same time, continue to monitor the pressure of the refrigerant system through the above-mentioned pressure detection module, that is, execute S204.

[0099] If the pressure is less than or equal to the first pressure threshold or greater than or equal to the second pressure threshold, for example, the pressure detected in S204 is 0.5 MPa and the first pressure threshold is 0.85 MPa, it indicates that the refrigerant system pressure is too high. Another example is that the pressure detected in S204 is 3.5 MPa and the second pressure threshold is 3.0 MPa, which also indicates that the refrigerant system pressure is too high. In this case, when the pressure of the refrigerant system is too high or too low, the system high-pressure protection or low-pressure protection is triggered, causing the air duct machine to exit the current control mode, that is, the compressor no longer operates at the lowest frequency and the electronic expansion valve no longer opens at the minimum opening, but adjusts the operating parameters of the air duct machine according to the fuzzy control rules, that is, execute S206.

[0100] It should be noted that when adjusting the operating parameters of the air hanging machine according to the fuzzy control rules, factors such as the indoor environmental temperature and the set temperature are usually considered. Taking the maximum refrigeration frequency of the compressor as 110 HZ as an example, when the operating load is 50%, the operating frequency of the compressor is between 60 HZ and 70 HZ, and the opening of the electronic expansion valve is between 100 pls and 200 pls. Adjusting the operating parameters according to the fuzzy control rules is a relatively conventional technical means in this field and will not be elaborated in detail in this article.

[0101] Based on the above method, when the wind speed of the indoor fan is not the highest wind speed, increase the wind speed of the indoor fan in order to blow away the condensed water on the indoor heat exchanger through a larger wind speed. When the wind speed of the indoor fan is already the highest wind speed, reduce the operating frequency of the compressor and the opening of the electronic expansion valve to reduce the amount of refrigerant circulating in the refrigerant system, thereby reducing the amount of refrigerant reaching the indoor heat exchanger per unit time and reducing the output cooling capacity, making the condensed water accumulating on the indoor heat exchanger less. At the same time, supplemented by the wind blown by the indoor fan operating at the highest wind speed, the condensed water accumulating on the indoor heat exchanger can be blown away as soon as possible. Through such a control method, the condensed water on the indoor heat exchanger can be minimized as much as possible, avoiding an increase in wind resistance due to excessive condensed water, which in turn affects the air supply volume, so that the air supply volume can be restored to the normal air volume as soon as possible, ensuring the refrigeration effect.

[0102] In a possible implementation, after reducing the operating frequency of the compressor to the minimum operating frequency and reducing the opening degree of the electronic expansion valve to the minimum opening degree for a first preset time, that is, after executing S203 for the first preset time, it means that the air duct machine has been operating at a low frequency for a period of time and has processed the condensate on the indoor heat exchanger. At this time, the operating parameters of the air duct machine are adjusted according to the fuzzy control rules to make the air duct machine operate in a normal refrigeration mode. After the air duct machine operates stably, it is determined again whether the air supply volume of the indoor unit of the air duct machine has returned to normal and whether it is still in a state of air volume attenuation. The method for judging whether the air volume attenuates is generally the same as that in S100 above and will not be elaborated here.

[0103] If the air supply volume of the indoor unit still attenuates, the first guide plate and the second guide plate are controlled to close, stopping the introduction of new air and the supply of air to the indoor space, so that no new condensate will re-accumulate on the indoor heat exchanger. At the same time, the compressor and the outdoor fan are controlled to stop operating, and the indoor fan operates at the highest wind speed, that is, the outdoor unit stops operating, stopping the supply of refrigerant to the indoor heat exchanger, and making the indoor fan blow the surface of the indoor heat exchanger at the highest wind speed, so that the condensate on the indoor heat exchanger can be dried as soon as possible. Through this setting method, while avoiding the generation of new condensate, the condensate that has accumulated on the indoor heat exchanger is dried by the operation of the indoor fan, so that the condensate on the indoor heat exchanger can be reduced or even removed as soon as possible, avoiding an increase in air resistance caused by the presence of condensate, thereby affecting the air supply volume, and enabling the air supply volume to return to the normal air volume as soon as possible to ensure the refrigeration effect.

[0104] It should be noted that when it is determined that the air volume of the indoor unit still attenuates, the operating frequency of the compressor can also be reduced, or the wind speed of the indoor fan can be increased. Of course, it is also possible to only control the first guide plate and the second guide plate to close, or only control the compressor to stop operating and make the indoor fan operate at the highest wind speed, or only control the compressor to stop operating, or only make the indoor fan operate at the highest wind speed.

[0105] After controlling the first guide plate and the second guide plate to close, and controlling the compressor and the outdoor fan to stop operating, and the indoor fan operates at the highest wind speed for a second preset time, in order to better ensure the refrigeration capacity, the air supply volume of the air duct machine is further judged, and the operating parameters and operating mode of the air duct machine are further adjusted according to the judgment result. The following combines Figure 5 to further elaborate on the possible implementation manners of the control method of the present application.

[0106] As Figure 5 shown, in a possible implementation, the control method of the present invention includes:

[0107] S300: Adjust the operating parameters of the air duct machine according to the fuzzy control rules;

[0108] S301: Determine whether the air supply volume of the indoor unit of the air duct machine has still decreased. If so, execute S302; if not, return to execute S300;

[0109] S302: Control the first guide plate and the second guide plate to close, and control the air duct machine to operate in the heating mode;

[0110] S303: Obtain the air pressure at the air outlet;

[0111] S304: Determine whether the air pressure is greater than the preset air pressure. If so, execute S305; if not, execute S303;

[0112] S305: Control the air duct machine to operate in the cooling mode;

[0113] S306: Obtain the air outlet temperature and the indoor ambient temperature at the air outlet;

[0114] S307: Determine whether the air outlet temperature is less than the indoor ambient temperature. If so, execute S308; if not, execute S306;

[0115] S308: Control the first guide plate and the second guide plate to open.

[0116] In S300, after controlling the first guide plate and the second guide plate to close, and controlling the compressor and the outdoor fan to stop running, and the indoor fan to run at the highest speed for a second preset time, it indicates that the outdoor unit has stopped running for some time, the indoor unit has not introduced new air, no new condensate has accumulated on the indoor heat exchanger, and the indoor fan has also run at the highest speed for some time. The condensate on the indoor heat exchanger should have been cleaned up. At this time, adjust the operating parameters of the air duct machine according to the fuzzy control rules to make the air duct machine operate in the normal cooling mode.

[0117] In S301, in order to ensure the cooling effect, determine again whether the air supply volume of the indoor unit of the air duct machine has returned to normal and whether it is still in the state of air volume attenuation. The method of determining whether the air volume has attenuated is roughly the same as that of S100 above, and will not be elaborated here.

[0118] If the air supply volume of the indoor unit has returned to normal, control the air duct machine to continue operating with the current parameters, that is, return to execute S300.

[0119] If the air supply volume of the indoor unit still decays, control the first guide plate and the second guide plate to close, and adjust the operation mode of the air duct machine to the heating mode, that is, execute S302. In this way, no new condensate will accumulate on the indoor heat exchanger. In the heating mode, the surface temperature of the indoor heat exchanger is increased, which can evaporate the existing condensate on the surface of the indoor heat exchanger and dry the surface of the indoor heat exchanger as soon as possible. In this case, since the first guide plate and the second guide plate have been closed, when the air duct machine operates in the heating mode, in order to ensure the normal and stable operation of the air duct machine, the compressor can operate at a lower operating frequency, the electronic expansion valve can be opened with a smaller opening degree, and the indoor fan can operate at a lower rotational speed. For example, the operating frequency of the compressor is 30HZ, the opening degree of the electronic expansion valve is 30pls, and the rotational speed of the indoor fan is at the low wind gear position. Obviously, when the air duct machine operates in the heating mode, the operating parameters of the air duct machine can also be adjusted according to the fuzzy control rules. In this embodiment, the operating parameters of the air duct machine when it operates in the heating mode are not limited.

[0120] In S303, after controlling the air duct machine to operate in the heating mode, detect the air pressure at the air outlet through the above-mentioned pressure sensor, that is, execute S303.

[0121] In S304, based on the air pressure obtained in S303, judge whether the air pressure is greater than or equal to the preset air pressure. It should be noted that the method of obtaining the value of the preset air pressure involved in judging whether the air supply volume decays in S100 is roughly the same as this, and will not be elaborated here.

[0122] If the air pressure is less than the preset air pressure, it means that there is still a certain air resistance. At this time, continue to control the air duct machine to operate in the heating mode and continue to monitor the air pressure at the air outlet, that is, execute S303.

[0123] If the air pressure is greater than the preset air pressure, it means that the air resistance has basically disappeared and there is no condensate on the surface of the indoor heat exchanger. At this time, adjust the operation mode of the air duct machine back to the cooling mode, that is, execute S305. To reduce the temperature of the indoor heat exchanger and prepare for providing cooling capacity to the indoor space. Of course, when the air pressure is equal to the preset air pressure, it also means that the air resistance has basically disappeared. At this time, adjust the operation mode of the air duct machine back to the cooling mode.

[0124] It should be noted that since the first guide plate and the second guide plate are in the closed state, when the air duct machine operates in the cooling mode, in order to ensure the normal and stable operation of the air duct machine, the compressor can operate at a lower operating frequency, the electronic expansion valve can be opened with a smaller opening degree, and the indoor fan can operate at a lower rotational speed. For example, the operating frequency of the compressor is 30HZ, the opening degree of the electronic expansion valve is 30pls, and the rotational speed of the indoor fan is at the low wind gear position. Obviously, when the air duct machine operates in the cooling mode, the operating parameters of the air duct machine can also be adjusted according to the fuzzy control rules. In this embodiment, the operating parameters of the air duct machine when it operates in the cooling mode are not limited.

[0125] In S306, since the heating mode has been run previously and the temperature of the indoor heat exchanger is relatively high, in order to avoid too high an air outlet temperature, at this time, the air outlet temperature at the air outlet and the indoor ambient temperature of the indoor space are respectively obtained through the above-mentioned first temperature sensor and second temperature sensor.

[0126] In S307, based on the air outlet temperature and the indoor ambient temperature obtained in S306, it is judged whether the air outlet temperature is less than the indoor ambient temperature.

[0127] If the air outlet temperature is greater than or equal to the indoor ambient temperature, in this case, the purpose of cooling the indoor space cannot be achieved. At this time, the air duct machine is continuously controlled to operate according to the current parameters, and the air outlet temperature and the indoor ambient temperature are continuously monitored, that is, return to execute S306.

[0128] If the air outlet temperature is less than the indoor ambient temperature, it means that the temperature of the indoor heat exchanger has dropped. At this time, the first guide plate and the second guide plate are controlled to open, that is, execute S308. The purpose of cooling is achieved through the heat exchange between the air and the indoor heat exchanger.

[0129] Based on the above control method, through the adjustment of the operation mode of the air duct machine, the condensed water on the indoor heat exchanger can be better removed, and the increase in air resistance caused by the existence of condensed water can be avoided, thereby affecting the air supply volume, so that the air supply volume of the indoor unit can be restored to the normal air volume as soon as possible, and thus the refrigeration effect can be better ensured.

[0130] It should be noted that after controlling the first guide plate and the second guide plate to close, controlling the compressor and the outdoor fan to stop running, and controlling the indoor fan to run at the highest wind speed, the operation parameters of the air duct machine can also be adjusted only according to this fuzzy control rule, without further judging whether the air supply volume of the indoor unit has decreased.

[0131] It should be noted that after reducing the operating frequency of the compressor to the lowest operating frequency and reducing the opening degree of the electronic expansion valve to the minimum opening degree for the first preset time in S203, after adjusting the operation parameters of the air duct machine according to the fuzzy control rule and running stably, when it is judged again that the air supply volume of the indoor unit of the air duct machine is still in the state of air volume attenuation, the operation parameters of the air duct machine can also not be further adjusted, but directly adjust the operation mode of the air duct machine to the heating mode, while closing the first guide plate and the second guide plate, and then when the air pressure at the air outlet is greater than or equal to the preset air pressure, adjust the operation mode of the air duct machine back to the refrigeration mode, and control the first guide plate and the second guide plate to open when the air outlet temperature at the outlet is less than the indoor ambient temperature.

[0132] Without departing from the basic principles of the present application, those skilled in the art can make flexible selections according to specific application scenarios, as long as the amount of condensate on the indoor heat exchanger can be reduced and the air supply volume can be restored to the normal air volume.

[0133] In a preferred embodiment, when it is determined that the air supply volume has attenuated, if the wind speed of the indoor fan is not the highest wind speed, the wind speed of the indoor fan is increased. If the wind speed of the indoor fan is already the highest wind speed, the operating frequency of the compressor is reduced to the lowest operating frequency, and the opening degree of the electronic expansion valve is reduced to the minimum opening degree. After operating in this state for a first preset time, the operating parameters of the air duct machine are adjusted according to the fuzzy control rules, and then it is determined again whether the air supply volume is still in the attenuated state. If the air supply volume is still attenuated, the first guide plate and the second guide plate are closed, the compressor and the outdoor fan are turned off, and the indoor fan operates at the highest wind speed. After operating in this state for a second preset time, the operating parameters of the air duct machine are adjusted according to the fuzzy control rules, and then it is determined again whether the air supply volume is still in the attenuated state. If the air supply volume is still attenuated, the first guide plate and the second guide plate are closed, the operating mode of the air duct machine is adjusted to the heating mode, and then when the wind pressure at the air outlet is greater than or equal to the preset wind pressure, the operating mode of the air duct machine is adjusted back to the cooling mode, and the first guide plate and the second guide plate are opened when the air outlet temperature is greater than the indoor ambient temperature.

[0134] In summary, in the preferred technical solution of the present invention, when the air duct machine operates in the cooling mode and the air supply volume has attenuated, the rotational speeds of the outdoor fan and the indoor fan of the air duct machine, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the opening and closing states of the first guide plate and the second guide plate are adjusted. By reducing the output cooling capacity and the air blown by the indoor fan, the condensate on the indoor heat exchanger is removed as soon as possible, and the increase in wind resistance caused by the presence of condensate is avoided, so that the air supply volume of the indoor unit can be restored to the normal air volume as soon as possible, thereby ensuring the cooling effect.

[0135] Although the above steps are described in the above sequential order in the above embodiments, those skilled in the art can understand that in order to achieve the effects of this embodiment, different steps do not have to be executed in such an order. They can be executed simultaneously (in parallel) or in a reversed order, and these simple changes are all within the protection scope of the present application.

[0136] So far, the technical solution of the present invention has been described in combination 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 principles 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 all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The air conditioner includes an indoor unit and an outdoor unit. The outdoor unit includes an outdoor fan, a compressor, and an electronic expansion valve. The indoor unit includes a housing and an indoor fan disposed within the housing. The housing has an air inlet and an air outlet, and a duct is formed between the air inlet and the air outlet. A first guide plate is provided at the air inlet, and a second guide plate is provided at the air outlet. The first guide plate is configured to be able to open or close the air inlet, and the second guide plate is configured to be able to open or close the air outlet. The control method includes: When the air conditioner operates in the cooling mode, determining whether the air supply volume of the indoor unit has decreased; Based on the first determination result, selectively adjusting the operating parameters and / or operating mode of the air conditioner; Wherein, the operating parameters of the air conditioner at least include one of the rotational speed of the outdoor fan, the wind speed of the indoor fan, the operating frequency of the compressor, the opening degree of the electronic expansion valve, and the opening and closing states of the first guide plate and the second guide plate.

2. The control method according to claim 1, characterized in that The step of "selectively adjusting the operating parameters and / or operating mode of the air conditioner based on the first determination result" further includes: When the air supply volume of the indoor unit has decreased, obtaining the wind speed of the indoor fan; Determining whether the wind speed is the maximum wind speed; Based on the second determination result, adjusting the operating parameters and / or operating mode of the air conditioner.

3. The control method according to claim 2, wherein The step of "adjusting the operating parameters and / or operating mode of the air conditioner based on the second determination result" further includes: If the wind speed is not the maximum wind speed, increasing the wind speed of the indoor fan; If the wind speed is the maximum wind speed, adjusting the operating frequency of the compressor and / or the opening degree of the electronic expansion valve.

4. The control method according to claim 3, characterized in that The step of "adjusting the operating frequency of the compressor and / or the opening degree of the electronic expansion valve" further includes: Reducing the operating frequency of the compressor and decreasing the opening degree of the electronic expansion valve; While or after controlling the compressor to operate at the reduced operating frequency and the electronic expansion valve to operate at the reduced opening degree, obtaining the pressure of the refrigerant system and adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve according to the pressure.

5. The control method according to claim 4, characterized in that, The step of "adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve according to the pressure" further includes: If the pressure is less than or equal to the first pressure threshold or the pressure is greater than or equal to the second pressure threshold, adjusting the operating parameters of the air conditioner according to the fuzzy control rule; If the pressure is greater than the first pressure threshold and less than the second pressure threshold, continue to control the compressor to operate at the reduced operating frequency and the electronic expansion valve to operate at the reduced opening degree.

6. The control method according to claim 3, wherein The control method further includes: After a first preset time of adjusting the operating frequency of the compressor and the opening degree of the electronic expansion valve, adjusting the operating parameters of the air conditioner according to the fuzzy control rule and determining again whether the air supply volume of the indoor unit still decreases; When the air supply volume of the indoor unit still decays, adjust the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the rotational speed of the outdoor fan, the air speed of the indoor fan, and / or the operating mode of the air conditioner.

7. The control method according to claim 6, characterized in that, The step of "adjusting the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the air speed of the indoor fan, and / or the operating mode of the air conditioner" further includes: Controlling the first guide plate and the second guide plate to close, controlling the compressor and the outdoor fan to stop operating, and controlling the indoor fan to operate at the maximum air speed.

8. The control method according to claim 7, wherein The indoor unit further includes an indoor heat exchanger disposed within the cabinet, and a pressure sensor is disposed in the air duct near the air outlet. The control method further includes: After controlling the first guide plate and the second guide plate to close, controlling the compressor and the outdoor fan to stop operating, and controlling the indoor fan to operate at the maximum air speed for a second preset time, adjust the operating parameters of the air conditioner according to the fuzzy control rule, and determine again whether the air supply volume of the indoor unit still decays; When the air supply volume of the indoor unit still decays, control the first guide plate and the second guide plate to close, adjust the operating mode of the air conditioner to the heating mode, detect the air pressure through the pressure sensor, when the air pressure is greater than or equal to the preset air pressure, control the operating mode of the air conditioner to be adjusted back to the cooling mode, and then when the air outlet temperature at the air outlet is less than the indoor ambient temperature, control the first guide plate and the second guide plate to open.

9. The control method according to claim 6, wherein The indoor unit further includes an indoor heat exchanger disposed within the cabinet, and a pressure sensor is disposed in the air duct near the air outlet. The step of "adjusting the opening and closing states of the first guide plate and the second guide plate, the operating frequency of the compressor, the air speed of the indoor fan, and / or the operating mode of the air conditioner" further includes: Controlling the first guide plate and the second guide plate to close, and adjusting the operating mode of the air conditioner to the heating mode; Detecting the air pressure through the pressure sensor, and when the air pressure is greater than or equal to the preset air pressure, controlling the operating mode of the air conditioner to be adjusted back to the cooling mode; Obtaining the air outlet temperature and the indoor ambient temperature at the air outlet, and when the air outlet temperature is less than the indoor ambient temperature, controlling the first guide plate and the second guide plate to open.

10. The control method according to claim 1, characterized in that, The indoor unit further includes an indoor heat exchanger disposed within the cabinet, the indoor heat exchanger is disposed downstream of the indoor fan along the air flow direction, and a pressure sensor is disposed in the air duct near the air outlet. The step of "determining whether the air supply volume of the indoor unit decays" further includes: Detecting the air pressure through the pressure sensor; When the air pressure is less than the preset air pressure, determining that the air supply volume of the indoor unit decays; or The indoor unit further includes an indoor heat exchanger disposed within the cabinet, and the indoor heat exchanger is disposed upstream of the indoor fan along the air flow direction. The step of "judging whether the air supply volume of the indoor unit has attenuated" further includes: Obtaining the temperature of the motor of the indoor fan; When the temperature of the motor is greater than the preset temperature, determining that the air supply volume of the indoor unit has attenuated.

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