Method and device for controlling air conditioner, and air conditioner

Abstract

The present application relates to the technical field of smart home appliances, and discloses a method for controlling an air conditioner. When the air conditioner is in a cooling operation mode and a protection shutdown occurs, the method includes: calculating the temperature change rate of the environment in which the outdoor unit is located within a preset time period before the air conditioner is shut down; determining the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan according to the temperature change rate; controlling the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan; wherein the initial valve opening of the electronic valve is positively correlated with the temperature change rate, the target frequency of the compressor is negatively correlated with the temperature change rate, and the target speed of the outdoor fan is positively correlated with the temperature change rate. The method can reduce the probability of fault shutdown. The present application also discloses a device for controlling an air conditioner and an air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a method and device for controlling an air conditioner, and an air conditioner. Background Art

[0002] The installation conditions of the air conditioner outdoor unit in some buildings are limited. They are installed in relatively closed grilles, which have poor ventilation and are not conducive to air conditioning heat exchange. After the air conditioner cooling function is turned on, the air conditioner outdoor unit continuously discharges heat, causing the ambient temperature in the closed space to quickly rise to a higher temperature. The condensation temperature of the air conditioner outdoor unit is too high, resulting in excessive system pressure, causing the air conditioner to shut down repeatedly, resulting in poor cooling effect, affecting user experience, and also shortening the service life of the air conditioner.

[0003] The related art discloses a control method for an air conditioner, including: if the outdoor ambient temperature is greater than a first preset temperature value and less than a second preset temperature value, controlling the air conditioner to enter a first target mode, wherein the air conditioner maintains a rated cooling capacity in the first target mode; if the outdoor ambient temperature is greater than a second preset temperature value, controlling the air conditioner to enter a second target mode, wherein the air conditioner maintains a normal operating state in the second target mode. According to the collected outdoor ambient temperature data, each execution module is adjusted so that the air conditioner can achieve coupling control of each execution module such as an internal fan, an external fan, a compressor, and an expansion valve when cooling at high temperature.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] Although this technology can reduce the chance of shutdown and improve the cooling effect when the outdoor ambient temperature is high, the control logic of this technology is complex. In addition, when the outdoor unit of the air conditioner is installed in a relatively closed grille and is in cooling mode, the ambient temperature of the outdoor unit often rises sharply. The relevant technology cannot be adjusted quickly in a short period of time, which may still lead to repeated protection shutdowns and easily cause faulty shutdowns. Therefore, the relevant technology is prone to cause faulty shutdowns.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a method and device for controlling an air conditioner, and an air conditioner, which can reduce the occurrence of faulty shutdowns.

[0009] In some embodiments, when the air conditioner is in a cooling operation mode and a protective shutdown occurs, the method for controlling the air conditioner includes: calculating the temperature change rate of the environment in which the outdoor unit is located within a preset time period before the air conditioner shuts down; determining the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan according to the temperature change rate; controlling the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan; wherein the initial valve opening of the electronic valve is positively correlated with the temperature change rate, the target frequency of the compressor is negatively correlated with the temperature change rate, and the target speed of the outdoor fan is positively correlated with the ambient temperature change rate.

[0010] In some embodiments, the device for controlling an air conditioner includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned method for controlling an air conditioner when running the program instructions.

[0011] In some embodiments, an air conditioner includes an air conditioner main body; and the above-mentioned device for air conditioner control is installed in the air conditioner main body.

[0012] The method and device for controlling an air conditioner and the air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0013] In the case of a protection shutdown of the outdoor unit, it may be due to the rapid change of the ambient temperature of the outdoor unit, resulting in excessive system pressure and shutdown. It is usually set that after three protection shutdowns in ten minutes, the air conditioner enters a fault shutdown and no longer restarts automatically. By judging the speed of change of the ambient temperature of the outdoor unit in the preset time period before the shutdown, it can be known whether the protection shutdown of the outdoor unit may be caused by the excessively high ambient temperature of the outdoor unit. In the case that the ambient temperature of the outdoor unit changes too quickly and the temperature is too high, the adjustment of the compressor frequency and the opening of the electronic valve cannot adapt to the rapid temperature change, and a protection shutdown will occur. After the outdoor unit automatically restarts again, the initial valve opening of the outdoor unit's electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan are re-determined according to the speed of change of the ambient temperature. The faster the ambient temperature changes, the larger the initial valve opening of the electronic valve, the smaller the target frequency of the compressor, and the higher the target speed of the outdoor fan. In this way, the heat discharged during the restart of the outdoor unit is reduced, the speed of change of the ambient temperature is reduced, and the probability of the protection shutdown is reduced, thereby reducing the probability of the fault shutdown, and the control logic is simple.

[0014] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0016] Figure 1 is a schematic diagram of a method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0017] Figure 2 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0018] Figure 3 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0019] Figure 4 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0020] Figure 5 is a schematic diagram of another method for controlling an air conditioner provided by an embodiment of the present disclosure;

[0021] Figure 6 is a schematic diagram of a device for controlling an air conditioner provided by an embodiment of the present disclosure;

[0022] Figure 7 It is a schematic diagram of an air conditioner provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0024] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0025] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0026] Unless otherwise stated, the term "plurality" means two or more.

[0027] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0028] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0029] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0030] Additionally, the term "setting" should be interpreted broadly.

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0032] The embodiment of the present disclosure provides an air conditioner, including an indoor unit, an outdoor unit, and a processor. The processor can calculate the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down, determine the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan according to the temperature change rate, and control the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0033] In combination with the above-mentioned air conditioner, the present disclosure provides a method for controlling the air conditioner. Figure 1 As shown, when the air conditioner is in cooling operation mode and a protection shutdown occurs, the method includes:

[0034] S101, the processor calculates the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down.

[0035] S102, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan according to the temperature change rate.

[0036] S103, the processor controls the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan.

[0037] After the air conditioner shuts down for protection, it will automatically restart after a period of time. After the air conditioner restarts, the air conditioner is controlled to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan.

[0038] Among them, the initial valve opening of the electronic valve is positively correlated with the temperature change rate, the target frequency of the compressor is negatively correlated with the temperature change rate, and the target speed of the external fan is positively correlated with the temperature change rate.

[0039] In the disclosed embodiment, when the outdoor unit is shut down for protection, it may be because the temperature of the environment where the outdoor unit is located changes too fast, resulting in shutdown due to excessive system pressure. It is usually set that after three protection shutdowns in ten minutes, the air conditioner enters a fault shutdown and no longer restarts automatically. By judging the speed of change of the ambient temperature of the outdoor unit in the preset time period before the shutdown, it can be known whether the protection shutdown of the outdoor unit may be caused by the excessively high ambient temperature of the outdoor unit. In the case where the ambient temperature of the outdoor unit changes too fast and the temperature is too high, the adjustment of the compressor frequency and the opening of the electronic valve cannot adapt to the excessively fast temperature change, and a protective shutdown will occur. After the outdoor unit is automatically restarted again, the initial valve opening of the electronic valve of the outdoor unit, the target frequency of the compressor, and the target speed of the outdoor fan are re-determined according to the speed of change of the ambient temperature. The faster the ambient temperature changes, the larger the initial valve opening of the electronic valve, the smaller the target frequency of the compressor, and the higher the target speed of the outdoor fan. In this way, the heat discharged during the restart of the outdoor unit is reduced, the speed of change of the ambient temperature is reduced, and the probability of the protective shutdown is reduced, thereby reducing the probability of the occurrence of the fault shutdown, and the control logic is simple.

[0040] Optionally, the processor calculates the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down, including: the processor obtains the first ambient temperature of the environment where the outdoor unit is located at a first time point and the second ambient temperature of the environment where the outdoor unit is located at a second time point; wherein the first time point is the start-up time point, and the second time point is the shutdown time point. The temperature change rate is calculated according to the first time point, the first ambient temperature, the second time point and the second ambient temperature. In this way, the temperature change between the startup time and the shutdown time can better reflect the temperature change rate of the environment where the outdoor unit is located after the air conditioner is turned on, and the operation time of the outdoor unit and the change of the ambient temperature can be calculated, and the ambient temperature change rate is calculated according to the change of the ambient temperature and the operation time. Thus, the initial valve opening of the electronic valve of the outdoor unit, the target frequency of the compressor and the target speed of the outdoor fan are re-determined according to the situation of the ambient temperature change speed. The operation of the air conditioner according to the re-determined initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan can reduce the heat discharged by the outdoor unit during the restart of operation, reduce the change rate of the ambient temperature, and reduce the probability of protective shutdown. Furthermore, the probability of failure-related downtime can be reduced.

[0041] Combination Figure 2 As shown, the embodiment of the present disclosure provides another method for controlling an air conditioner. When the air conditioner is in a cooling operation mode and a protection shutdown occurs, the method includes:

[0042] S201, the processor obtains a first ambient temperature of the environment where the outdoor unit is located at a first time point and a second ambient temperature of the environment where the outdoor unit is located at a second time point; wherein the first time point is a startup time point, and the second time point is a shutdown time point.

[0043] S202, the processor calculates the temperature change rate according to the first time point, the first ambient temperature, the second time point and the second ambient temperature.

[0044] S203, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan according to the temperature change rate.

[0045] S204, the processor controls the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan.

[0046] Among them, the initial valve opening of the electronic valve is positively correlated with the temperature change rate, the target frequency of the compressor is negatively correlated with the temperature change rate, and the target speed of the external fan is positively correlated with the temperature change rate.

[0047] In the disclosed embodiment, the temperature change between the startup time and the shutdown time can better reflect the temperature change rate of the ambient temperature of the outdoor unit after the air conditioner is started, and the operation time of the outdoor unit and the change of the ambient temperature can be calculated, and the ambient temperature change rate is calculated according to the change of the ambient temperature and the operation time. Thus, the initial valve opening of the electronic valve of the outdoor unit, the target frequency of the compressor and the target speed of the outdoor fan are re-determined according to the speed of change of the ambient temperature. The operation of the air conditioner according to the re-determined initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan can reduce the heat discharged by the outdoor unit during the restart of operation, reduce the change rate of the ambient temperature, and reduce the probability of protective shutdown. Furthermore, the probability of fault shutdown can be reduced.

[0048] Optionally, the processor calculates the temperature change rate according to the first time point, the first ambient temperature, the second time point and the second ambient temperature, including: the processor calculates the ambient temperature difference ΔT=T2-T1 according to the first ambient temperature and the second ambient temperature; the processor calculates the running time t=t2-t1 according to the first time point and the second time point; the processor calculates the temperature change rate S=ΔT / t according to the ambient temperature difference and the running time; wherein T1 is the first ambient temperature, T2 is the second ambient temperature, t1 is the first time point, and t2 is the second time point. For example, the air conditioner is turned on at 08:20 and the protection shutdown time is 08:35. Then, the first time point is 08:20 and the second time point is 08:35. This is only an exemplary description. For example, the first time point is 08:25, the first ambient temperature is 35°C, the second time point is 08:35, and the second ambient temperature is 65°C. Then, ΔT is 30°C, t is 10min, and S=30°C / 10min=3°C / min. In this way, the temperature change rate can be calculated. Therefore, the initial valve opening of the outdoor unit's electronic valve, the compressor target frequency, and the outdoor fan target speed can be re-determined according to the temperature change rate. The air conditioner can be operated according to the re-determined initial valve opening of the electronic valve, the compressor target frequency, and the outdoor fan target speed, which can reduce the heat discharged by the outdoor unit during the restart of operation, reduce the speed of change of the ambient temperature, and reduce the probability of protective shutdown. In addition, the probability of fault shutdown can be reduced.

[0049] Optionally, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan according to the temperature change rate, including: when S1<S≤S2, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan according to the outdoor ambient temperature. When S2<S≤S3, the processor determines the initial valve opening of the electronic valve and the target frequency of the compressor according to the outdoor ambient temperature, and determines the maximum speed of the outdoor fan as the target speed of the outdoor fan. When S>S3, the processor determines the maximum valve opening of the electronic valve as the initial valve opening of the electronic valve, determines the minimum operating frequency of the compressor as the target frequency of the compressor, and determines the maximum speed of the outdoor fan as the target speed of the outdoor fan. Wherein, S is the temperature change rate, S1 is the first temperature change rate threshold, S2 is the second temperature change rate threshold, S3 is the third temperature change rate threshold, and S1<S2<S3. Optionally, S1 is 1°C, S2 is 2°C, and S3 is 4°C. The faster the temperature changes, the smaller the regulating effect of the air conditioner on the compressor exhaust temperature through the control logic before the shutdown on the electronic valve opening, compressor frequency, and external fan speed. Therefore, according to different temperature change speeds, the corresponding electronic valve initial valve opening, compressor target frequency, and external fan target speed are determined. The air conditioner can be operated according to the determined electronic valve initial valve opening, compressor target frequency, and external fan target speed. After the air conditioner is shut down for protection and restarted, it can run stably, the change rate of the compressor exhaust temperature is slowed down, and the change of the system pressure is slowed down. Therefore, while reducing the probability of protective shutdown, it also reduces the impact on the cooling effect of the air conditioner.

[0050] Optionally, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan according to the outdoor ambient temperature, including: the processor determines the first valve opening corresponding to the outdoor ambient temperature according to a preset first mapping relationship, and calculates the initial valve opening of the electronic valve according to the following formula: K0=K1+ΔK1; wherein K0 is the initial valve opening of the electronic valve, K1 is the first valve opening, and ΔK1 is the first preset valve opening. The processor determines the compressor frequency corresponding to the outdoor ambient temperature as the compressor target frequency according to a preset second mapping relationship. The processor determines the outdoor fan speed corresponding to the outdoor ambient temperature as the outdoor fan target speed according to a preset third mapping relationship. The first mapping relationship is a one-to-one correspondence between the outdoor ambient temperature and the first valve opening stored in the air conditioner. For example, when the outdoor ambient temperature is between 20°C and 25°C, the corresponding first valve opening is 120 steps. The second mapping relationship is a one-to-one correspondence between the outdoor ambient temperature and the compressor target frequency stored in the air conditioner. For example, when the outdoor ambient temperature is between 20°C and 25°C, the corresponding compressor target frequency is 80Hz. The third mapping relationship is a one-to-one correspondence between the outdoor ambient temperature and the target speed of the outdoor fan stored in the air conditioner. For example, when the outdoor ambient temperature is between 20°C and 25°C, the corresponding target speed of the outdoor fan is 400r / min. The first preset valve opening is a parameter stored in the air conditioner, which can be set and modified according to demand. The value range of the first preset valve opening is [20 steps, 40 steps]. Optionally, the first preset valve opening is 20 steps, 30 steps or 40 steps. For example, the first valve opening is 120 steps, and the first preset valve opening is 30 steps, then the initial valve opening is 120 steps + 30 steps = 150 steps. In this way, the air conditioner is restarted after protection shutdown and runs with a larger initial valve opening, which can slow down the change rate of the compressor exhaust temperature and the change of the system pressure. Thereby, the probability of protection shutdown is reduced.

[0051] Optionally, the processor determines the initial valve opening of the electronic valve and the target frequency of the compressor according to the outdoor ambient temperature, including: the processor determines the second valve opening corresponding to the outdoor ambient temperature according to a preset first mapping relationship, and calculates the initial valve opening of the electronic valve according to the following formula: K0=K2+ΔK2; wherein K0 is the initial valve opening of the electronic valve, K2 is the second valve opening, and ΔK2 is the second preset valve opening. The processor determines the compressor frequency corresponding to the outdoor ambient temperature as the compressor target frequency according to the preset second mapping relationship. The first mapping relationship is a one-to-one correspondence between the outdoor ambient temperature and the first valve opening stored in the air conditioner. For example, when the outdoor ambient temperature is between 20°C and 25°C, the corresponding first valve opening is 120 steps. The second mapping relationship is a one-to-one correspondence between the outdoor ambient temperature and the compressor target frequency stored in the air conditioner. For example, when the outdoor ambient temperature is between 20°C and 25°C, the corresponding compressor target frequency is 80Hz. The first preset valve opening is a parameter stored in the air conditioner, which can be set and modified according to demand. The value range of the second preset valve opening is [40 steps, 80 steps]. Optionally, the second preset valve opening is 40 steps, 60 steps or 80 steps. For example, if the second valve opening is 160 steps and the second preset valve opening is 60 steps, the initial valve opening is 160 steps + 60 steps = 220 steps. In this way, the air conditioner is restarted after protection shutdown and runs with a larger initial valve opening, which can slow down the change rate of the compressor exhaust temperature and the change of the system pressure. Thus, the probability of protection shutdown is reduced.

[0052] Optionally, the method further includes: in the case of S1<S≤S2, the processor controls the air conditioner to run for a first preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan. In the case of S2<S≤S3, the processor controls the air conditioner to run for a second preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan. In the case of S3<S≤S4, the processor controls the air conditioner to run for a third preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan. In the case of S>S4, the processor controls the air conditioner to run for a fourth preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan. Wherein, S is the temperature change speed, S1 is the first temperature change speed threshold, S2 is the second temperature change speed threshold, S3 is the third temperature change speed threshold, S4 is the fourth temperature change speed threshold, the fourth preset time is greater than or equal to the third preset time, the third preset time is greater than the second preset time, and the second preset time is greater than or equal to the first preset time. In the case of S≤S1, the air conditioner is operated according to the control logic before it is shut down. In the case of S>S1, after the air conditioner has been running for a preset time, it is operated according to the control logic before it is shut down. In the case where the temperature change rate is less than or equal to S1, it means that the air conditioner's protection shutdown is not caused by excessive changes in the ambient temperature of the outdoor unit, so the air conditioner still runs according to the control logic before it is shut down after it is restarted. Optionally, S1 is 1°C, S2 is 2°C, S3 is 4°C, and S4 is 6°C. The value range of the first preset time length is [2min, 3min]. Optionally, the first preset time length is 2min, 2.5min or 3min. The value range of the second preset time length is [2min, 3min]. Optionally, the second preset time length is 2min, 2.5min or 3min. The value range of the third preset time length is [5min, 10min]. Optionally, the third preset time length is 5min, 8min or 10min. The value range of the fourth preset time length is [5min, 10min]. Optionally, the fourth preset time is 5 minutes, 8 minutes or 10 minutes. In this way, by controlling the air conditioner to run for a preset time according to the initial valve opening, target frequency and target speed of the external fan, the air conditioner can be made to run stably after protection shutdown and restart, the change rate of the compressor exhaust temperature is slowed down, and the change of the system pressure is slowed down. After the air conditioner runs for a preset time, it runs according to the control logic before the air conditioner is shut down, so that the cooling operation effect of the air conditioner can be guaranteed.

[0053] Combination Figure 3 As shown, the embodiment of the present disclosure provides another method for controlling an air conditioner. When the air conditioner is in a cooling operation mode and a protection shutdown occurs, the method includes:

[0054] S301, the processor calculates the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down.

[0055] S302, the processor determines whether S satisfies S1<S≤S2. If yes, execute steps S303 to S304. Otherwise, execute step S305.

[0056] S303, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan according to the outdoor ambient temperature.

[0057] S304, the processor controls the air conditioner to run for a first preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0058] S305, the processor determines whether S satisfies S2<S≤S3. If yes, execute steps S306 to S308. Otherwise, execute step S309.

[0059] S306: The processor determines an initial electronic valve opening and a compressor target frequency according to the outdoor ambient temperature.

[0060] S307: The processor determines the maximum speed of the external fan as the target speed of the external fan.

[0061] S308, the processor controls the air conditioner to run for a second preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0062] S309, the processor determines whether S satisfies S3<S≤S4. If yes, execute steps S310 to S313. Otherwise, execute step S314.

[0063] S310: The processor determines the maximum valve opening as the initial valve opening of the electronic valve.

[0064] S311: The processor determines the minimum operating frequency as the compressor target frequency.

[0065] S312: The processor determines the maximum speed of the external fan as the target speed of the external fan.

[0066] S313, the processor controls the air conditioner to run for a third preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0067] S314, the processor determines whether S satisfies S>S4. If so, steps S315 to S318 are executed. Otherwise, step S319 is executed.

[0068] S315: The processor determines the maximum valve opening as the initial valve opening of the electronic valve.

[0069] S316: The processor determines the minimum operating frequency as the compressor target frequency.

[0070] S317: The processor determines the maximum speed of the external fan as the target speed of the external fan.

[0071] S318, the processor controls the air conditioner to run for a fourth preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0072] S319, the processor operates according to the control logic before the air conditioner is shut down.

[0073] Wherein, S is the temperature change rate, S1 is the first temperature change rate threshold, S2 is the second temperature change rate threshold, S3 is the third temperature change rate threshold, and S4 is the fourth temperature change rate threshold.

[0074] In the disclosed embodiment, by controlling the air conditioner to run for a preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the external fan, the air conditioner can be made to run stably after the protection shutdown and restart, the change rate of the compressor exhaust temperature is slowed down, and the change of the system pressure is slowed down. Thus, the probability of the protective shutdown is reduced. Furthermore, the probability of the occurrence of fault shutdown can be reduced. After the air conditioner runs for a preset time, it runs according to the control logic before the air conditioner is shut down, which can ensure the cooling operation effect of the air conditioner.

[0075] Optionally, before the processor controls the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan, the method further includes: the processor reduces the closing speed of the electronic valve; and / or, the processor increases the opening speed of the electronic valve; and / or, the processor reduces the frequency increase speed of the compressor. During the operation of the air conditioner, it is necessary to adjust the valve opening of the electronic valve in real time so that the exhaust temperature of the compressor reaches the target exhaust temperature. If the exhaust temperature of the compressor is higher than the target exhaust temperature, it is necessary to increase the opening of the electronic valve to reduce the exhaust temperature of the compressor. If the exhaust temperature of the compressor is lower than the target exhaust temperature, it is necessary to reduce the opening of the electronic valve to increase the exhaust temperature of the compressor. The speed at which the opening of the electronic valve is increased is the valve opening speed, and the speed at which the opening of the electronic valve is reduced is the valve closing speed. When the exhaust temperature of the compressor is greater than the target exhaust temperature, the exhaust temperature of the compressor can be reduced more quickly by increasing the opening speed of the electronic valve, so as to avoid the exhaust temperature of the compressor being in an excessively high state for a long time and triggering a protection shutdown. When the exhaust temperature of the compressor is lower than the target exhaust temperature, the exhaust temperature of the compressor can be prevented from rising too fast by reducing the closing speed of the electronic valve, which may cause the exhaust temperature to be too high and trigger a protective shutdown. During the operation of the air conditioner, the operating frequency of the compressor will increase and decrease according to the outdoor ambient temperature of the air conditioner. The faster the compressor increases, the greater the pressure of the system, which is more likely to trigger a protective shutdown. In the case of S>S1, reduce the closing speed of the electronic valve, and / or increase the opening speed of the electronic valve, and / or reduce the frequency increase speed of the compressor. After the air conditioner is protected and automatically restarted, adjust the opening degree of the electronic valve of the air conditioner and the frequency of the compressor according to the adjusted speed. The value range of the closing speed after the valve closing speed is reduced is [0.5s / step, 1s / step]. Optionally, the closing speed after the valve closing speed is reduced is 0.5s / step, 0.8s / step or 1s / step. The value range of the opening speed after the valve opening speed is increased is [15ms / step, 30ms / step]. Optionally, the valve opening speed is increased to 15ms / step, 20ms / step or 30ms / step. The value range of the frequency increase speed is [0.2Hz / s, 0.5Hz / s]. Optionally, the frequency increase speed is reduced to 0.2Hz / s, 0.4Hz / s or 0.5Hz / s. In this way, reducing the valve closing speed can slow down the increase rate of the compressor exhaust temperature, increasing the valve opening speed can quickly reduce the compressor exhaust temperature, and reducing the compressor frequency increase speed can slow down the increase rate of the compressor exhaust temperature. As a result, the system pressure change during the operation of the air conditioner slows down, the change rate of the outdoor unit ambient temperature slows down, and the probability of protection shutdown is reduced.

[0076] Combination Figure 4 As shown, the embodiment of the present disclosure provides another method for controlling an air conditioner. When the air conditioner is in a cooling operation mode and a protection shutdown occurs, the method includes:

[0077] S401, the processor calculates the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down.

[0078] S402, the processor determines the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan according to the temperature change rate.

[0079] S403, the processor reduces the closing speed of the electronic valve; and / or, the processor increases the opening speed of the electronic valve; and / or, the processor reduces the frequency increase speed of the compressor.

[0080] S404, the processor controls the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan.

[0081] In the disclosed embodiment, reducing the valve closing speed can slow down the increase speed of the compressor exhaust temperature, increasing the valve opening speed can quickly reduce the compressor exhaust temperature, and reducing the compressor frequency increase speed can slow down the increase speed of the compressor exhaust temperature. As a result, the system pressure change during the operation of the air conditioner slows down, the change speed of the outdoor unit ambient temperature slows down, and the probability of protection shutdown is reduced.

[0082] During the actual operation of the air conditioner, another method for controlling the air conditioner is as follows Figure 5 When the air conditioner is in cooling operation mode and a protection shutdown occurs, the method includes:

[0083] S501, calculating the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down.

[0084] S502, determine whether S satisfies S1<S≤S2. If yes, execute steps S503 to S507. Otherwise, execute step S508. For example, if S1 is 1℃ / min, S2 is 2℃ / min, and S is 1.5℃ / min, then execute steps S503 to S507. For example, if S1 is 1℃ / min, S2 is 2℃ / min, and S is 3℃ / min, then execute step S508.

[0085] S503: Determine a first valve opening corresponding to the outdoor ambient temperature according to a preset first mapping relationship.

[0086] S504: The first valve opening is increased by the first preset valve opening to determine the initial valve opening. For example, if the first valve opening is 160 steps and the first preset valve opening is 30 steps, the initial valve opening is 190 steps.

[0087] S505: According to a preset second mapping relationship, determine the compressor frequency corresponding to the outdoor ambient temperature as the compressor target frequency.

[0088] S506: According to a preset third mapping relationship, determine the external fan speed corresponding to the outdoor ambient temperature as the external fan target speed.

[0089] S507, controlling the air conditioner to operate for a first preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0090] S508, determine whether S satisfies S2<S≤S3. If yes, execute steps S509 to S513. Otherwise, execute step S514. For example, if S2 is 2℃ / min, S3 is 4℃ / min, and S is 3℃ / min, then execute steps S509 to S513. For example, if S1 is 2℃ / min, S3 is 4℃ / min, and S is 5℃ / min, then execute step S514.

[0091] S509: Determine a second valve opening corresponding to the outdoor ambient temperature according to a preset first mapping relationship.

[0092] S510, the second valve opening is increased by the second preset valve opening to determine the initial valve opening. For example, if the second valve opening is 160 steps and the second preset valve opening is 50 steps, the initial valve opening is 210 steps.

[0093] S511: According to a preset second mapping relationship, determine a compressor frequency corresponding to the outdoor ambient temperature as a compressor target frequency.

[0094] S512: Determine the maximum speed of the external fan as the target speed of the external fan.

[0095] S513, controlling the air conditioner to operate for a second preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0096] S514, determine whether S satisfies S3<S≤S4. If yes, execute steps S515 to S518. Otherwise, execute step S519. For example, if S3 is 4℃ / min, S4 is 6℃ / min, and S is 5℃ / min, then execute steps S515 to S518. For example, if S3 is 4℃ / min, S4 is 6℃ / min, and S is 8℃ / min, then execute step S519.

[0097] S515, determining the maximum valve opening as the initial valve opening of the electronic valve.

[0098] S516: Determine the minimum operating frequency as the compressor target frequency.

[0099] S517: Determine the maximum speed of the external fan as the target speed of the external fan.

[0100] S518, controlling the air conditioner to operate for a third preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0101] S519, determine whether S satisfies S>S4. If so, execute steps S520 to S523. Otherwise, execute step S524. For example, if S4 is 6℃ / min and S is 8℃ / min, then execute steps S520 to S523. For example, if S4 is 6℃ / min and S is 0.5℃ / min, then execute step S524.

[0102] S520: Determine the maximum valve opening as the initial valve opening of the electronic valve.

[0103] S521, determining the minimum operating frequency as the compressor target frequency.

[0104] S522, determining the maximum speed of the external fan as the target speed of the external fan.

[0105] S523, controlling the air conditioner to operate for a fourth preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor, and the target speed of the outdoor fan.

[0106] S524, operating according to the control logic before the air conditioner is shut down.

[0107] Wherein, S is the temperature change rate, S1 is the first temperature change rate threshold, S2 is the second temperature change rate threshold, S3 is the third temperature change rate threshold, and S4 is the fourth temperature change rate threshold.

[0108] Combination Figure 6 As shown, the embodiment of the present disclosure provides another device 300 for controlling an air conditioner, including a processor 100 and a memory 101 storing program instructions. Optionally, the device may also include a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the method for controlling an air conditioner of the above embodiment.

[0109] In addition, the logic instructions in the memory 101 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0110] The memory 101 is a storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 100 executes the function application and data processing by running the program instructions / modules stored in the memory 101, that is, the method for controlling the air conditioner in the above embodiment is implemented.

[0111] The memory 101 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 101 may include a high-speed random access memory and may also include a non-volatile memory.

[0112] Combination Figure 7 As shown, an embodiment of the present disclosure provides an air conditioner 200, including an air conditioner body, and the above-mentioned device 300 for controlling the air conditioner. The device 300 for controlling the air conditioner is installed in the air conditioner body. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. It can be understood by those skilled in the art that the device 300 for controlling the air conditioner can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0113] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned method for controlling an air conditioner.

[0114] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0115] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0116] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0117] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0118] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0119] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling an air conditioner, characterized in that: When the air conditioner is in cooling operation mode and a protection shutdown occurs, the method includes: Calculating the temperature change rate of the environment where the outdoor unit is located within a preset time period before the air conditioner is shut down; comprising: obtaining a first ambient temperature of the environment where the outdoor unit is located at a first time point and a second ambient temperature of the environment where the outdoor unit is located at a second time point; wherein the first time point is a startup time point, and the second time point is a shutdown time point; calculating the temperature change rate according to the first time point, the first ambient temperature, the second time point and the second ambient temperature; Determine the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan according to the temperature change rate; including: in the case of S1<S≤S2, determine the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan according to the outdoor ambient temperature; in the case of S2<S≤S3, determine the initial valve opening of the electronic valve and the target frequency of the compressor according to the outdoor ambient temperature, and determine the maximum speed of the outdoor fan as the target speed of the outdoor fan; in the case of S>S3, determine the maximum valve opening of the electronic valve as the initial valve opening of the electronic valve, determine the minimum operating frequency of the compressor as the target frequency of the compressor, and determine the maximum speed of the outdoor fan as the target speed of the outdoor fan; wherein S is the temperature change rate, S1 is the first temperature change rate threshold, S2 is the second temperature change rate threshold, S3 is the third temperature change rate threshold, and S1<S2<S3; Controlling the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan; The initial valve opening of the electronic valve is positively correlated with the temperature change rate, the target frequency of the compressor is negatively correlated with the temperature change rate, and the target speed of the external fan is positively correlated with the temperature change rate.

2. The method according to claim 1, characterized in that: Calculating the temperature change rate according to the first time point, the first ambient temperature, the second time point, and the second ambient temperature includes: Calculating an ambient temperature difference ΔT=T2-T1 according to the first ambient temperature and the second ambient temperature; Calculate the running time t=t2-t1 according to the first time point and the second time point; Calculate the temperature change rate S=ΔT / t according to the ambient temperature difference and the operating time; Wherein, T1 is the first ambient temperature, T2 is the second ambient temperature, t1 is the first time point, and t2 is the second time point.

3. The method according to claim 1, characterized in that The step of determining the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan according to the outdoor ambient temperature includes: According to a preset first mapping relationship, a first valve opening corresponding to the outdoor ambient temperature is determined, and the initial valve opening of the electronic valve is calculated according to the following formula: K0=K1+ΔK1; wherein K0 is the initial valve opening of the electronic valve, K1 is the first valve opening, and ΔK1 is the first preset valve opening; According to a preset second mapping relationship, determining a compressor frequency corresponding to the outdoor ambient temperature as the compressor target frequency; According to a preset third mapping relationship, the external fan speed corresponding to the outdoor ambient temperature is determined as the external fan target speed.

4. The method according to claim 1, characterized in that: Determining the initial valve opening of the electronic valve and the target frequency of the compressor according to the outdoor ambient temperature includes: According to the preset first mapping relationship, the second valve opening corresponding to the outdoor ambient temperature is determined, and the initial valve opening of the electronic valve is calculated according to the following formula: K0=K2+ΔK2; wherein K0 is the initial valve opening of the electronic valve, K2 is the second valve opening, and ΔK2 is the second preset valve opening; According to a preset second mapping relationship, a compressor frequency corresponding to the outdoor ambient temperature is determined as the compressor target frequency.

5. The method according to any one of claims 1 to 4, characterized in that: Also includes: In the case of S1<S≤S2, the air conditioner is controlled to run for a first preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan; In the case of S2<S≤S3, the air conditioner is controlled to run for a second preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan; In the case of S3<S≤S4, the air conditioner is controlled to run for a third preset time according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the external fan; In the case of S>S4, the air conditioner is controlled to operate for a fourth preset time period according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan; Among them, S is the temperature change rate, S1 is the first temperature change rate threshold, S2 is the second temperature change rate threshold, S3 is the third temperature change rate threshold, S4 is the fourth temperature change rate threshold, the fourth preset time length is greater than or equal to the third preset time length, the third preset time length is greater than the second preset time length, and the second preset time length is greater than or equal to the first preset time length.

6. The method according to claim 5, characterized in that Before controlling the air conditioner to operate according to the initial valve opening of the electronic valve, the target frequency of the compressor and the target speed of the outdoor fan, the method further includes: Reduce the closing speed of the electronic valve; and / or, Increase the opening speed of the electronic valve; and / or, Reduce the compressor's ramp-up speed.

7. A device for controlling an air conditioner, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for controlling an air conditioner according to any one of claims 1 to 6 when running the program instructions.

8. An air conditioner, characterized in that: include: Air conditioner body; and, The device for controlling an air conditioner according to claim 7 is installed in the air conditioner body.

Images