Air conditioner and control method thereof

Abstract

The invention relates to the technical field of air conditioners, particularly provides an air conditioner and a control method thereof, and aims to solve the problems that in the prior art, when an air conditioner is started at low temperature in winter, the frequency increasing speed of a compressor is low, so that cold air prevention time is long, and user experience is affected. In order to achieve the purpose, the control method comprises the steps that when the air conditioner operates in a heating mode, the first environment temperature of the indoor space is obtained; comparing the first environment temperature with a first threshold value; and controlling the air conditioner to operate the first cold air prevention strategy or the second cold air prevention strategy based on the comparison result. According to the method, the specific cold air prevention strategy is determined based on the first environment temperature, so that the cold air prevention time can be shortened as much as possible while cold air blowing of a user is avoided and the cold air prevention requirement is met, and then the user experience is improved.

Description

Technical Field

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

[0002] Air conditioners have entered more and more families because they can adjust the temperature of the indoor space, cooling the indoor space in summer and heating the indoor space in winter. In winter, since the temperature of the indoor space is usually low, at the initial stage of the air conditioner running in the heating mode, the temperature of the air sent out by the air conditioner is usually low, resulting in poor user experience.

[0003] For this reason, currently many air conditioners usually have a cold air prevention function. The outdoor unit operates normally, and the indoor unit will only start normally after the temperature of the first coil of the indoor heat exchanger rises to a certain temperature. During the cold air prevention stage, the outdoor fan and the compressor of the air conditioner operate normally, and the indoor fan stops rotating. In this case, if the frequency increase speed of the compressor is too fast, the heat dissipation of the indoor heat exchanger will be poor due to the stop of the indoor fan, which will further lead to too high pressure in the refrigerant system. Therefore, during this process, the compressor is usually controlled to increase the frequency at a lower speed to avoid too high pressure in the refrigerant system.

[0004] However, a low frequency increase speed of the compressor will result in less heating capacity provided, a slower temperature rise speed of the first coil of the indoor heat exchanger, and further a longer cold air prevention stage, seriously affecting the user experience.

[0005] Correspondingly, the art needs a new technical solution to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the above technical problems, that is, to solve the problem in the prior art that when the air conditioner starts at low temperature in winter, the cold air prevention time is long due to the slow frequency increase speed of the compressor, affecting the user experience.

[0007] In a first aspect, the present invention provides a control method for an air conditioner, and the control method includes:

[0008] When the air conditioner operates in the heating mode, obtaining the first ambient temperature of the indoor space;

[0009] Comparing the first ambient temperature with a first threshold;

[0010] Controlling the air conditioner to operate a first cold air prevention strategy or a second cold air prevention strategy based on the comparison result.

[0011] In a preferred technical solution of the above control method, "controlling the air conditioner to operate a first cold air prevention strategy or a second cold air prevention strategy based on the comparison result" further includes:

[0012] If the first ambient temperature is greater than the first threshold, control the air conditioner to operate the first anti-cold wind strategy.

[0013] In a preferred technical solution of the above control method, the air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes a casing, an indoor heat exchanger is disposed inside the casing, and the casing has an air inlet and an air outlet.

[0014] The first anti-cold wind strategy includes:

[0015] Control the outdoor unit to operate;

[0016] Obtain the first coil temperature of the indoor heat exchanger and the first air outlet temperature at the air outlet;

[0017] Based on the first ambient temperature, the first coil temperature, and the first air outlet temperature, control the operation of the indoor unit.

[0018] In a preferred technical solution of the above control method, the indoor unit includes a casing, the casing has an air inlet and an air outlet, a first guide plate is disposed at the air inlet, the first guide plate is configured to be able to open or close the air inlet, a second guide plate is disposed at the air outlet, the second guide plate is configured to be able to open or close the air outlet, and an indoor fan is disposed inside the casing. The indoor fan is configured to enable the air in the indoor space to enter the casing through the air inlet and enable the air in the casing to be sent into the indoor space through the air outlet.

[0019] "Based on the first ambient temperature, the first coil temperature, and the first air outlet temperature, control the operation of the indoor unit" further includes:

[0020] Compare the first coil temperature with a second threshold;

[0021] Based on the comparison result between the first coil temperature and the second threshold, control the operation of the indoor fan;

[0022] While or after controlling the operation of the indoor fan, selectively control the opening of the first guide plate and the second guide plate based on the first ambient temperature, the first coil temperature, and the first air outlet temperature.

[0023] In a preferred technical solution of the above control method, "Based on the comparison result between the first coil temperature and the second threshold, control the operation of the indoor fan" further includes:

[0024] If the first coil temperature is greater than the second threshold, control the indoor fan to operate at a preset speed.

[0025] In a preferred technical solution of the above control method, "selectively controlling the opening of the first guide plate and the second guide plate based on the first ambient temperature, the first coil temperature, and the first air outlet temperature" further includes:

[0026] Calculating a first difference between the first coil temperature and the first ambient temperature;

[0027] If the first difference is greater than a third threshold value and the first air outlet temperature is greater than a fourth threshold value, then control the first guide plate and the second guide plate to open.

[0028] In a preferred technical solution of the above control method, the control method further includes:

[0029] While or after controlling the first guide plate and the second guide plate to open, acquire again the second ambient temperature of the indoor space, the second coil temperature of the indoor heat exchanger, and the second air outlet temperature at the air outlet;

[0030] Control the opening or closing of the first guide plate and the second guide plate based on the second ambient temperature, the second coil temperature, and the second air outlet temperature.

[0031] In a preferred technical solution of the above control method, "controlling the opening or closing of the first guide plate and the second guide plate based on the second ambient temperature, the second coil temperature, and the second air outlet temperature" further includes:

[0032] Calculating a second difference between the first air outlet temperature and the first ambient temperature, and a third difference between the second coil temperature and the second ambient temperature;

[0033] If the second difference is less than a fifth threshold value, then control the first guide plate and the second guide plate to close;

[0034] If the third difference is greater than a sixth threshold value, then control the first guide plate and the second guide plate to open.

[0035] In a preferred technical solution of the above control method, the air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes a housing having an air inlet and an air outlet. A first guide plate is provided at the air inlet, and the first guide plate is configured to be able to open or close the air inlet. A second guide plate is provided at the air outlet, and the second guide plate is configured to be able to open or close the air outlet. An indoor fan is provided inside the housing, and the indoor fan is configured to be able to allow the air in the indoor space to enter the housing through the air inlet and to send the air in the housing into the indoor space through the air outlet.

[0036] "Based on the comparison result, controlling the air conditioner to operate the first anti-cold wind strategy or the second anti-cold wind strategy" further includes:

[0037] If the first ambient temperature is less than or equal to the first threshold value, controlling the air conditioner to operate the second anti-cold wind strategy, where the second anti-cold wind strategy includes:

[0038] Controlling the outdoor unit to operate;

[0039] Obtaining the first coil temperature of the indoor heat exchanger;

[0040] When the first coil temperature is greater than the seventh threshold value, controlling the first deflector and the second deflector to open and controlling the indoor fan to operate.

[0041] In the technical solution of the present invention, when the air conditioner operates in the heating mode, the first ambient temperature is obtained, and then based on the comparison result between the first ambient temperature and the first threshold value, the air conditioner is controlled to operate the first anti-cold wind strategy or the second anti-cold wind strategy. That is to say, the present invention determines the specific anti-cold wind strategy according to the first ambient temperature, so that while avoiding the user from being blown by cold wind and meeting the requirements of anti-cold wind, the anti-cold wind time can be shortened as much as possible, thereby improving the user experience.

[0042] If the first ambient temperature is greater than the first threshold value, controlling the air conditioner to operate the first anti-cold wind strategy. Specifically, the first anti-cold wind strategy includes: controlling the outdoor unit to operate, obtaining the first coil temperature and the first air outlet temperature of the indoor heat exchanger. When the first coil temperature is greater than the second threshold value, controlling the indoor fan to operate at a lower preset speed, and making the air in the indoor unit flow through the operation of the indoor fan, appropriately reducing the first coil temperature of the indoor heat exchanger to prevent the pressure of the refrigerant system from being too high. At the same time or after controlling the operation of the indoor fan, calculating the first difference between the first coil temperature and the first ambient temperature. When the first difference is greater than the third threshold value and the first air outlet temperature is greater than the fourth threshold value, it means that the temperature of the air sent out by the indoor unit is relatively high at this time, and the air blown to the user is hot air. At this time, controlling the first deflector and the second deflector to open, the anti-cold wind stage ends, and the air conditioner enters the normal heating mode, sending hot air into the indoor space to increase the temperature of the indoor space. In this way, based on the monitoring of the first ambient temperature, the first coil temperature, and the first air outlet temperature, the operation of the indoor fan, the first deflector, and the second deflector is controlled, and the indoor unit can be turned on without the coil temperature of the indoor heat exchanger rising to a high enough level, and the heating mode can be normally operated as soon as possible, shortening the anti-cold wind duration and effectively improving the user experience.

[0043] While or after controlling the opening of the first air deflector and the second air deflector, when the second difference between the second air outlet temperature and the second ambient temperature is less than the fifth threshold value, it indicates that the second air outlet temperature is relatively close to the second ambient temperature and the second air outlet temperature is on the low side. This also means that the heating capacity provided by the indoor heat exchanger is not sufficient at this time. At this time, the first air deflector and the second air deflector are controlled to close, and the external air supply is paused to avoid affecting the user experience due to the low air supply temperature. When the third difference between the second coil temperature and the second ambient temperature is greater than the sixth threshold value, it indicates that the second coil temperature is already relatively high at this time and can provide sufficient heating capacity to well increase the temperature of the air. At this time, the first air deflector and the second air deflector are controlled to open to supply air to the indoor space. Through such a control method, when the air conditioner can provide sufficient heating capacity, the first air deflector and the second air deflector are opened to increase the temperature of the indoor space, and when the heating capacity is insufficient, the first air deflector and the second air deflector are closed to prevent cold air from being blown to the user. In this way, it can not only meet the demand of preventing cold air, but also quickly turn on the heating mode when meeting the heating demand, effectively shortening the cold air prevention time and improving the user experience.

[0044] In a second aspect, the present invention further provides an air conditioner, which includes a control module for executing the control method described in any of the foregoing solutions.

[0045] It should be noted that this air conditioner has all the technical effects of the foregoing control method and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The preferred embodiments of the present invention will be described below by taking an air duct machine as an example and in conjunction with the accompanying drawings, in which:

[0047] Figure 1 is a schematic structural diagram of the indoor unit of an air duct machine according to an embodiment of the present invention;

[0048] Figure 2 is a flowchart of the control method of an air duct machine according to an embodiment of the present invention;

[0049] Figure 3 is a control flowchart of the first cold air prevention strategy according to an embodiment of the present invention.

[0050] List of reference numerals:

[0051] 1. Machine shell; 11. Air inlet; 12. Air outlet; 13. First air deflector; 14. Second air deflector; 2. Indoor fan; 3. Indoor heat exchanger. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] 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 principles 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.

[0053] It should be noted that in the description of this 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 components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific situations. In addition, the terms "first" to "seventh" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] Currently, when an air conditioner starts in low temperature in winter, to avoid the user from blowing cold air, usually the outdoor unit is operated first, and the indoor unit will be started only after the temperature of the first coil of the indoor heat exchanger rises to a certain temperature. However, in this process, since the indoor fan stops rotating, if the frequency increase speed of the compressor is too fast, it will cause the pressure of the refrigerant system to be too high. Therefore, during the cold air prevention stage, the compressor usually increases its frequency at a lower speed. However, this will result in an overly long cold air prevention stage, affecting the user experience. For this reason, the air conditioner of the present invention controls the operation of the first cold air prevention strategy or the second cold air prevention strategy based on the comparison result between the first ambient temperature and the first threshold value, so as to be able to shorten the cold air prevention time and improve the user experience while avoiding the user from blowing cold air and meeting the requirements of cold air prevention.

[0055] Such as Figure 1As 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 a throttling element (such as an electronic expansion valve, etc.). The indoor unit includes a casing 1, an indoor fan 2, and an indoor heat exchanger 3 disposed within the casing 1. The refrigerant of the refrigerant system circulates between the compressor, the outdoor heat exchanger, the throttling element, and the indoor heat exchanger 3 through refrigerant pipes. The casing 1 has an air inlet 11 and an air outlet 12. A first guide plate 13 is provided at the air inlet 11, and a second guide plate 14 is provided at the air outlet 12. A first driving motor and a second driving motor are configured within the indoor unit. The power output end of the first driving motor is connected to the first guide plate 13, and the power output end of the second driving motor is connected to the second guide plate 14. 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, under the action of the indoor fan, enters the casing through the air inlet 11, exchanges heat with the indoor heat exchanger, is heated or cooled, and then returns to the indoor space through the air outlet 12, thereby achieving the purpose of heating or cooling.

[0056] It should be noted that Figure 1 the first guide plate 13 and the second guide plate 14 shown in

[0057] are provided as louvers. Obviously, the first guide plate 13 and the second guide plate 14 may not be louvers, but may be set 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.

[0058] In addition, the indoor unit is further configured with a first temperature sensor and a second temperature sensor. Among them, the first temperature sensor is disposed at a position close to the indoor heat exchanger and is used to detect the coil temperature of the indoor heat exchanger. The second temperature sensor is disposed at a position close to the air outlet and is used to detect the air outlet temperature at the air outlet.

[0059] It should be noted that the first temperature sensor, the second temperature sensor, and the indoor temperature sensor can be, but are not limited to, thermal resistors, thermocouples, etc. Among them, the thermal resistor is made of 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, the second temperature sensor, and the indoor temperature sensor are not limited, as long as they can respectively detect the coil temperature of the indoor heat exchanger, the air outlet temperature at the air outlet, and the ambient temperature of the indoor space.

[0060] 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 indoor temperature sensor, and can control the air duct machine to operate the first anti-cold wind strategy or the second anti-cold wind strategy based on the comparison result between the first ambient temperature and the first threshold, can control the indoor unit to operate based on the first ambient temperature, the first coil temperature, and the first air outlet temperature when the first ambient temperature is greater than the first threshold, and can also control the outdoor unit to operate when the first ambient temperature is less than or equal to the first threshold, and control the first guide plate and the second guide plate to open and control the indoor fan to operate when the first coil temperature is greater than the seventh threshold, etc.

[0061] 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 this application, or also a functional module or functional unit of a general controller.

[0062] The following combines Figure 2 and Figure 3 to elaborate on possible implementation manners of the control method of the present invention.

[0063] As Figure 2 shown, in a possible implementation manner, the control method of the present invention includes:

[0064] S100: When the air duct machine operates in the heating mode, obtain the first ambient temperature;

[0065] S101: Judge whether the first ambient temperature is greater than the first threshold. If so, execute S103; if not, execute S102;

[0066] S102: Control the air duct machine to operate the second anti-cold wind strategy;

[0067] S103: Control the air duct machine to operate the first anti-cold wind strategy.

[0068] In S100, when the air duct machine operates in the heating mode, it indicates that the current ambient temperature is relatively low. At this time, the ambient temperature of the indoor space is obtained through the above-mentioned indoor temperature sensor.

[0069] In S101, based on the first ambient temperature obtained in S100, it is judged whether it is greater than the first threshold.

[0070] If the first ambient temperature is less than or equal to the first threshold, for example, the first threshold is 10°C and the first ambient temperature is 5°C. In this case, it indicates that the first ambient temperature is relatively low at this time. Then, the air duct machine is controlled to operate the second anti-cold wind strategy, that is, S102 is executed.

[0071] Specifically, the second anti-cold wind strategy includes: controlling the outdoor unit to operate, obtaining the first coil temperature of the indoor heat exchanger, and controlling the first guide plate and the second guide plate to open and the indoor fan to operate when the first coil temperature is greater than the seventh threshold. That is to say, when the first ambient temperature is less than or equal to the first threshold, first control the outdoor unit to operate, that is, control the compressor and the outdoor fan to operate, the throttling element is opened, the refrigerant is compressed by the compressor to obtain a high-temperature and high-pressure refrigerant, releases heat at the indoor heat exchanger to obtain a low-temperature and high-pressure refrigerant, is decompressed by the throttling element, and absorbs heat at the outdoor heat exchanger to obtain a low-temperature and low-pressure refrigerant, and then returns to the compressor, so as to circulate. As the refrigerant circulates in the refrigerant system, the first coil temperature of the indoor heat exchanger gradually increases. When the first coil temperature rises to be greater than the seventh threshold, for example, the first coil temperature is 30°C and the seventh threshold is 28°C, it indicates that the first coil temperature is high enough at this time to effectively increase the temperature of the air after heat exchange with it, and there is no need to let the user blow cold air. At this time, the above-mentioned first drive motor and the second drive motor are controlled to operate to open the first guide plate and the second guide plate, that is, open the air inlet and the air outlet, and at the same time control the indoor fan to operate, so that the air in the indoor space enters the casing through the air inlet, exchanges heat with the indoor heat exchanger, and the heated air returns to the indoor space through the air outlet, thereby increasing the temperature of the indoor space. The temperature of the air sent out through the air outlet is significantly higher than the temperature of the indoor space, and the user will not feel the cold air blowing, achieving the purpose of preventing cold air. It should be noted that in this case, the rotation speed of the indoor fan can be a pre-set rotation speed, or the rotation speed when the air duct machine was last operated, or the rotation speed determined by the control module of the air duct machine according to the preset temperature and the first ambient temperature, etc.

[0072] If the first ambient temperature is greater than the first threshold, for example, the first threshold is 10°C and the first ambient temperature is 12°C. In this case, it indicates that the first ambient temperature is not particularly low at this time. Then, the air duct machine is controlled to operate the first anti-cold wind strategy, that is, S103 is executed.

[0073] Specifically, the first cold air prevention strategy includes: controlling the operation of the outdoor unit, obtaining the first coil temperature and the first air outlet temperature of the indoor heat exchanger, and controlling the operation of the indoor unit based on the first ambient temperature, the first coil temperature, and the first air outlet temperature. That is to say, when the first ambient temperature is greater than the first threshold, first control the operation of the outdoor unit, which means controlling the operation of the compressor and the outdoor fan and opening the throttling element, so that the refrigerant circulates between the compressor, the indoor heat exchanger, and the outdoor heat exchanger. During the refrigerant circulation process, the first coil temperature of the indoor heat exchanger gradually increases, and the first air outlet temperature at the air outlet also gradually increases. At this time, the indoor unit is in the off state, which means the first guide plate and the second guide plate are closed and the indoor fan is not operating. In this case, control the operation of the indoor unit based on the first ambient temperature, the first coil temperature, and the first air outlet temperature. It should be noted that the operation of the indoor unit includes the operation of the indoor fan, the first guide plate, and the second guide plate.

[0074] Next, in conjunction with Figure 3 to elaborate on the possible implementation methods for controlling the indoor unit in the first cold air prevention strategy of the present application.

[0075] As Figure 3 shown, in a possible implementation manner, the control method of the present invention includes:

[0076] S200: Obtain the first coil temperature of the indoor heat exchanger;

[0077] S201: Determine whether the first coil temperature is greater than the second threshold. If so, execute S202; if not, return to execute S200;

[0078] S202: Control the indoor air duct unit to operate at a preset speed;

[0079] S203: Calculate the first difference between the first coil temperature and the first ambient temperature;

[0080] S204: Determine whether the first difference is greater than the third threshold. If so, execute S205; if not, return to execute S200;

[0081] S205: Obtain the first air outlet temperature at the air outlet;

[0082] S206: Determine whether the first air outlet temperature is greater than the fourth threshold. If so, execute S207; if not, return to execute S205;

[0083] S207: Control the first guide plate and the second guide plate to open;

[0084] S208: Obtain the second ambient temperature and the second air outlet temperature;

[0085] S209: Calculate the second difference between the second air outlet temperature and the second ambient temperature;

[0086] S210: Determine whether the second difference is less than the fifth threshold. If so, execute S211; if not, execute S208.

[0087] S211: Control the first guide plate and the second guide plate to close.

[0088] S212: Obtain the temperature of the second coil.

[0089] S213: Calculate the third difference between the temperature of the second coil and the second ambient temperature.

[0090] S214: Determine whether the third difference is greater than the sixth threshold. If so, execute S207; if not, execute S212.

[0091] In S200, the first coil temperature of the indoor heat exchanger is obtained through the above-mentioned first temperature sensor.

[0092] In S201, based on the first coil temperature obtained in S200, determine whether the first coil temperature is greater than the second threshold.

[0093] If the first coil temperature is less than or equal to the second threshold, it indicates that the coil temperature of the indoor heat exchanger is still relatively low at this time. Then, return to execute S200 to continue obtaining the first coil temperature of the indoor heat exchanger.

[0094] If the first coil temperature is greater than the second threshold, for example, the first coil temperature is 15 °C and the second threshold is 10 °C, it indicates that the coil temperature of the indoor heat exchanger has risen at this time. Then, control the indoor fan to operate at a preset speed, that is, execute S202. The operation of the indoor fan enables the air in the casing to circulate, appropriately reducing the first coil temperature of the indoor heat exchanger to prevent the pressure of the refrigerant system from being too high. Preferably, the preset speed is the lowest speed of the indoor fan. For example, the preset speed is 300 r / min. Obviously, the preset speed can also be other values slightly higher than the lowest speed, as long as the indoor fan can operate normally at this preset speed when the first guide plate and the second guide plate are closed.

[0095] In S203, based on the first coil temperature obtained in S200 and the first ambient temperature obtained in S100, calculate the first difference. It should be noted that the first difference is the value obtained by subtracting the first ambient temperature from the first coil temperature.

[0096] In S204, based on the first difference calculated in S203, determine whether the first difference is greater than the third threshold.

[0097] If the first difference is less than or equal to the third threshold, for example, the first difference is -1°C and the third threshold is 1°C, it indicates that the coil temperature of the indoor heat exchanger is still relatively low at this time and cannot effectively increase the temperature of the air exchanging heat with it. In this case, return to execute S200 to continue obtaining the coil temperature of the indoor heat exchanger.

[0098] If the first difference is greater than the third threshold, for example, the first difference is 3°C and the third threshold is 1°C, it indicates that the coil temperature of the indoor heat exchanger is already relatively high at this time and can increase the temperature of the air exchanging heat with it. And in this situation, with the operation of the indoor fan, the temperature at the air outlet has risen. At this time, obtain the first air outlet temperature at the air outlet through the above-mentioned second temperature sensor, that is, execute S205.

[0099] In S206, based on the first air outlet temperature obtained in S205, determine whether the first air outlet temperature is greater than the fourth threshold.

[0100] If the first air outlet temperature is less than or equal to the fourth threshold, for example, the first air outlet temperature is 15°C and the fourth threshold is 27°C, it indicates that the coil temperature of the indoor heat exchanger is not high enough at this time, the temperature of the air after exchanging heat with it is still relatively low, and it is still relatively cold when blowing on the body. At this time, continue to obtain the first air outlet temperature at the air outlet through the above-mentioned second temperature sensor, that is, return to execute S205.

[0101] If the first air outlet temperature is greater than the fourth threshold, for example, the first air outlet temperature is 29°C and the fourth threshold is 27°C, it indicates that the temperature of the air sent out by the indoor unit is already relatively high at this time, and it is hot air when blowing on the user. At this time, control the first guide plate and the second guide plate to open, that is, execute S207. That is to say, the cold air prevention stage ends, and without waiting for the coil temperature of the indoor heat exchanger to rise to a high enough level, the air duct machine can be controlled to enter the normal heating mode, send hot air into the indoor space, increase the indoor environment temperature, and effectively shorten the cold air prevention duration.

[0102] It should be noted that although the above is described in the way of first comparing the first difference with the third threshold and then comparing the first air outlet temperature with the fourth threshold, that is, first executing S203 and S204 and then executing S205 and S206, it is obviously only an exemplary description. Obviously, it is also possible to first execute S205 and S206 and then execute S203 and S204. Of course, it is also possible to execute S203 and S204, S205 and S206 simultaneously, that is, execute S203 and S205 simultaneously, and execute S204 and S206 simultaneously.

[0103] It should be noted that it is also possible to control the opening of the indoor fan, the first deflector, and the second deflector based on the first ambient temperature, the first coil temperature, and the first outlet air temperature in other ways. For example, when the first coil temperature is greater than the first ambient temperature, control the indoor fan to operate at a preset speed, regardless of the magnitude of the first difference, and only control the first deflector and the second deflector to open when the first outlet air temperature is greater than the fourth threshold, etc. Without departing from the basic principle of the present application, as long as the cold air prevention duration can be effectively shortened and at the same time the user can be prevented from being blown by cold air.

[0104] In S208, after controlling the first deflector and the second deflector to open, the air in the indoor space enters the casing under the action of the indoor fan, the air volume flowing through the indoor heat exchanger increases, the temperature of the air after exchanging heat with the indoor heat exchanger may decrease, and the temperature of the indoor space may be slightly increased when the heated air returns to the indoor space. At this time, the second ambient temperature of the indoor space and the second outlet air temperature at the air outlet are respectively obtained through the above-mentioned room temperature sensor and the second temperature sensor.

[0105] In S209, a second difference is calculated based on the second ambient temperature and the second outlet air temperature obtained in S208. It should be noted that the second difference is the value obtained by subtracting the second ambient temperature from the second outlet air temperature.

[0106] In S210, based on the second difference obtained in S209, it is determined whether the second difference is less than the fifth threshold.

[0107] If the second difference is greater than or equal to the fifth threshold, for example, the second difference is 6°C and the fifth threshold is 1°C, it means that the outlet air temperature is relatively appropriate, higher than the ambient temperature, and the user will not feel cold air, and the temperature of the indoor space can be effectively increased. At this time, continue to monitor the second ambient temperature and the second outlet air temperature, that is, return to execute S208.

[0108] If the second difference is less than the fifth threshold, for example, the second difference is 0°C and the fifth threshold is 1°C, it means that the outlet air temperature is on the low side, which also means that the heating capacity provided by the indoor heat exchanger is not enough at this time. At this time, control the first deflector and the second deflector to close, that is, execute S211. Pause the outward air supply to avoid affecting the user experience due to the low air supply temperature.

[0109] In S212, after closing the first deflector and the second deflector, the compressor and the indoor fan operate normally, and the coil temperature of the indoor heat exchanger will gradually increase. At this time, continue to obtain the coil temperature of the indoor heat exchanger through the above-mentioned first temperature sensor.

[0110] In S213, based on the second coil temperature obtained in S212 and the second ambient temperature obtained in S208, calculate a third difference. It should be noted that this third difference is the value obtained by subtracting the second ambient temperature from the second coil temperature.

[0111] In S214, based on the third difference calculated in S213, determine whether this third difference is greater than a sixth threshold.

[0112] If this third difference is less than or equal to the sixth threshold, for example, the third difference is 0°C and the sixth threshold is 5°C, it indicates that the coil temperature of the indoor heat exchanger is still relatively low at this time. Then, continue to keep the first guide plate and the second guide plate closed, and continue to monitor the coil temperature of the indoor heat exchanger, which means returning to execute S212.

[0113] If this third difference is greater than the sixth threshold, for example, the third difference is 8°C and the sixth threshold is 5°C, it indicates that the coil temperature of the indoor heat exchanger is already relatively high at this time, and it can provide sufficient heating capacity to effectively increase the temperature of the air. Then, control the first guide plate and the second guide plate to open, which means returning to execute S207. Open the air inlet and the air outlet, introduce the air in the indoor space into the casing through the indoor fan, and send it out through the air outlet after heating. The temperature of the sent-out air is effectively increased, and the user will not feel cold, thereby effectively increasing the temperature of the indoor space.

[0114] It should be noted that it is also possible to control the opening and closing of the first guide plate and the second guide plate based on the second ambient temperature, the second coil temperature, and the second air outlet temperature in other ways. For example, control the first guide plate and the second guide plate to close when the second air outlet temperature is less than or equal to the second ambient temperature, and control the first guide plate and the second guide plate to open when the second coil temperature is greater than the second ambient temperature, etc. As long as it can avoid the user from being blown by cold air without deviating from the basic principle of this application.

[0115] Obviously, after controlling the first guide plate and the second guide plate to open, it is also possible not to detect the ambient temperature and the air outlet temperature, that is, it is possible not to execute S208 to S214 after executing S207.

[0116] It should be noted that although the above is described in the way of first comparing the second difference with the fifth threshold and then comparing the third difference with the sixth threshold, that is, first executing S208 to S211 and then executing S212 to S214, obviously this is only an exemplary description, and it is obviously also possible to first execute S212 to S214 and then execute S208 to S211.

[0117] It should be noted that the specific values of the above parameters such as the first ambient temperature, the first coil temperature, the first air outlet temperature, the first difference, the second difference, the third difference, the first threshold, the second threshold, the third threshold, the fourth threshold, the fifth threshold, the sixth threshold, the seventh threshold, and the preset rotational speed are merely exemplary descriptions and not restrictive. Without departing from the basic principle of the present application, those skilled in the art can flexibly select the specific values of these parameters according to the specific application scenarios, as long as it can avoid the user from being blown by cold air and shorten the cold air prevention time.

[0118] Through the above control method, based on the monitoring of the first ambient temperature, the first coil temperature, and the first air outlet temperature, the operation of the indoor fan, the first deflector, and the second deflector is controlled. It is not necessary for the coil temperature of the indoor heat exchanger to rise to a sufficiently high level to turn on the indoor unit. The heating mode can be normally operated as soon as possible, and the cold air prevention duration can be shortened. And after the first deflector and the second deflector are turned on, based on the further monitoring of the ambient temperature, the air outlet temperature, and the coil temperature, it can effectively avoid the user from being blown by cold air and can also turn on the heating mode as soon as possible, thereby effectively improving the user experience.

[0119] It should be noted that the first cold air prevention strategy can also be that when the air duct machine operates in the heating mode, the outdoor unit is controlled to operate, and at the same time, the indoor fan is controlled to operate, the first deflector and the second deflector are opened, and the air supply direction of the second deflector is upward.

[0120] In summary, in the preferred technical solution of the present invention, when the first ambient temperature is greater than the first threshold, the outdoor unit is made to operate, and when the first coil temperature is greater than the second threshold, the indoor fan is turned on. Then, when the first difference between the first coil temperature and the first ambient temperature is greater than the third threshold and the first air outlet temperature is greater than the fourth threshold, the first deflector and the second deflector are opened, and the cold air prevention stage ends. The air duct machine can enter the normal heating mode within a short time while avoiding the user from being blown by cold air. At the same time, after the first deflector and the second deflector are opened, the ambient temperature, the air outlet temperature, and the coil temperature are detected in real time, so as to better avoid the user from being blown by cold air. When the first ambient temperature is less than or equal to the first threshold, the outdoor unit is first made to operate, and after the coil temperature of the indoor heat exchanger rises to be greater than the seventh threshold, the indoor unit is made to operate, and the cold air prevention stage ends. Through such a control method, the cold air prevention strategy of the air duct machine can be adjusted according to the actual ambient temperature, while meeting the requirements of cold air prevention, the cold air prevention time is shortened as much as possible, and the user experience is effectively improved.

[0121] In addition, the present invention further provides an air conditioner, which includes a control module, and the control module is used to execute the control method described in any of the foregoing solutions.

[0122] It should be noted that the air conditioner has all the technical effects of the foregoing control method and will not be elaborated herein.

[0123] In the above embodiments, although the various steps are described in the above order, those skilled in the art can understand that in order to achieve the effects of this embodiment, the 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 this application.

[0124] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying 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 all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioner, characterized in that, The control method includes: When the air conditioner operates in the heating mode, obtaining the first ambient temperature of the indoor space; Comparing the first ambient temperature with a first threshold; Based on the comparison result, controlling the air conditioner to operate a first anti-cold wind strategy or a second anti-cold wind strategy.

2. The control method according to claim 1, wherein "Based on the comparison result, controlling the air conditioner to operate a first anti-cold wind strategy or a second anti-cold wind strategy" further includes: If the first ambient temperature is greater than the first threshold, controlling the air conditioner to operate the first anti-cold wind strategy.

3. The control method according to claim 2, wherein The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes a casing, an indoor heat exchanger is provided inside the casing, and the casing has an air inlet and an air outlet. The first anti-cold wind strategy includes: Controlling the outdoor unit to operate; Obtaining the first coil temperature of the indoor heat exchanger and the first air outlet temperature at the air outlet; Based on the first ambient temperature, the first coil temperature, and the first air outlet temperature, controlling the operation of the indoor unit.

4. The control method according to claim 3, characterized in that, A first guide plate is provided at the air inlet, the first guide plate is configured to be able to open or close the air inlet, a second guide plate is provided at the air outlet, the second guide plate is configured to be able to open or close the air outlet, and an indoor fan is provided inside the casing. The indoor fan is configured to enable the air in the indoor space to enter the casing through the air inlet and enable the air in the casing to be sent into the indoor space through the air outlet. "Based on the first ambient temperature, the first coil temperature, and the first air outlet temperature, controlling the operation of the indoor unit" further includes: Comparing the first coil temperature with a second threshold; [[ID= ​ 5. The control method according to claim 4, characterized in that, ​ ​ 6. The control method according to claim 4, characterized in that ​ ​ ​ 7. The control method according to claim 6, wherein ​ ​ ​ 8. The control method according to claim 7, wherein "Controlling the opening or closing of the first air deflector and the second air deflector based on the second ambient temperature, the second coil temperature, and the second air outlet temperature" further includes: Calculating a second difference between the first air outlet temperature and the first ambient temperature, and a third difference between the second coil temperature and the second ambient temperature; If the second difference is less than a fifth threshold, controlling the first air deflector and the second air deflector to close; If the third difference is greater than a sixth threshold, controlling the first air deflector and the second air deflector to open.

9. The control method according to claim 1, wherein The air conditioner includes an indoor unit and an outdoor unit. The indoor unit includes a housing having an air inlet and an air outlet. A first air deflector is provided at the air inlet and is configured to open or close the air inlet. A second air deflector is provided at the air outlet and is configured to open or close the air outlet. An indoor fan is provided inside the housing and is configured to allow air in the indoor space to enter the housing through the air inlet and to send the air in the housing into the indoor space through the air outlet. "Controlling the air conditioner to operate a first anti-cool draft strategy or a second anti-cool draft strategy based on the comparison result" further includes: If the first ambient temperature is less than or equal to the first threshold, controlling the air conditioner to operate the second anti-cool draft strategy, where the second anti-cool draft strategy includes: Controlling the outdoor unit to operate; Obtaining a first coil temperature of the indoor heat exchanger; When the first coil temperature is greater than a seventh threshold, controlling the first air deflector and the second air deflector to open and controlling the indoor fan to operate.

10. An air conditioner, characterized in that, The air conditioner includes a control module for executing the control method according to any one of the above claims 1-9.

Images