Control method of air conditioner, air conditioner and storage medium

Abstract

The invention discloses a control method of an air conditioner, the air conditioner and a storage medium, and relates to the technical field of air conditioners. The method comprises the steps that current change parameters of the air conditioner and the first temperature of a heat exchanger in a condensation state in the air conditioner are obtained; under the condition that the current change parameter and the first temperature meet preset conditions, the air conditioner is controlled to execute pressure protection operation; wherein the preset condition shows that the system pressure of the air conditioner is in an abnormal rising state. The invention aims to reduce the phenomenon of system pressure overrun and improve the reliability of the air conditioner.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to a control method for an air conditioner, an air conditioner, and a storage medium. Background Art

[0002] During the operation of an air conditioner, the refrigerant can circulate in the refrigerant circuit driven by the compressor. When flowing through the heat exchanger, it can exchange heat with the air in the environment to achieve the regulation of the ambient air.

[0003] In the related art, when there is no pressure switch in the refrigerant system of the air conditioner, the exhaust temperature of the compressor is generally monitored to be abnormal or the compressor itself is overloaded and protected, and the machine stops. Such a method has the situation of untimely response, resulting in the system pressure exceeding the maximum allowable pressure, which affects the reliability of the air conditioner. Summary of the Invention

[0004] The main purpose of this application is to provide a control method for an air conditioner, an air conditioner, and a storage medium, aiming to reduce the occurrence of system pressure overlimit and improve the reliability of the air conditioner.

[0005] To achieve the above object, this application proposes a control method for an air conditioner, and the control method for the air conditioner includes:

[0006] Obtain the current change parameter of the air conditioner and the first temperature of the heat exchanger in the air conditioner in a condensing state;

[0007] When the current change parameter and the first temperature meet the preset conditions, control the air conditioner to perform a pressure protection operation;

[0008] Among them, the preset condition indicates that the system pressure of the air conditioner is in an abnormal rising state.

[0009] In an embodiment, the preset condition includes a first condition or a second condition;

[0010] The first condition includes that the first rising rate parameter of the total machine current of the air conditioner is greater than or equal to a first preset threshold, and the first temperature is greater than or equal to a first preset temperature, and the current change parameter includes the first rising rate parameter;

[0011] The second condition includes that the second rising rate parameter of the total machine current of the air conditioner is greater than or equal to a second preset threshold, the third rising rate parameter of the fan current in the air conditioner is greater than or equal to a third preset threshold, and the first temperature is greater than or equal to a second preset temperature, and the current change parameter includes the second rising rate parameter and the third rising rate parameter.

[0012] In an embodiment, the control method for the air conditioner further includes:

[0013] Obtain the ambient temperature of the environment where the air conditioner is located;

[0014] Determine the first preset temperature according to the ambient temperature.

[0015] In one embodiment, the step of determining the first preset temperature according to the ambient temperature includes:

[0016] When the ambient temperature is greater than or equal to a preset ambient temperature, determine the first temperature threshold as the first preset temperature;

[0017] When the ambient temperature is less than the preset ambient temperature, determine the second temperature threshold as the first preset temperature;

[0018] Wherein, the first temperature threshold is less than the second temperature threshold.

[0019] In one embodiment, before the step of controlling the air conditioner to perform a pressure protection operation when the current change parameter and the first temperature meet a preset condition, it further includes:

[0020] When the air conditioner meets the stable operation condition, determine that the preset condition includes the first condition;

[0021] When the air conditioner does not meet the stable operation condition and the compressor of the air conditioner is in a preset frequency limit state, determine that the preset condition includes the second condition.

[0022] In one embodiment, the preset frequency limit state includes that the compressor reduces the frequency or prohibits frequency increase or operates at a frequency less than or equal to the corresponding protection frequency when meeting the overcurrent protection condition.

[0023] In one embodiment, the stable operation conditions include at least one of the following: the frequency deviation value between the target frequency and the actual frequency of the compressor in the air conditioner is less than or equal to a preset threshold, the rotational speed of the fan in the air conditioner is greater than or equal to a preset rotational speed, and the rotational speed of the fan in the air conditioner does not decrease.

[0024] In one embodiment, the step of obtaining the current change parameter of the air conditioner includes:

[0025] When the air conditioner meets the stable operation condition, successively obtain a first current set and a second current set of the air conditioner, the first current set includes at least two first whole-machine currents, and the second current set includes at least two second whole-machine currents;

[0026] Determine a corresponding first current eigenvalue according to at least two first overall unit currents, and determine a corresponding second current eigenvalue according to at least two second overall unit currents;

[0027] Determine the first rising rate parameter according to the first current eigenvalue and the second current eigenvalue.

[0028] In one embodiment, the first current set includes multiple first overall unit currents, and the step of determining a corresponding first current eigenvalue according to at least two first overall unit currents includes:

[0029] Determine the average value of the other current set except the maximum current and the minimum current among the multiple first overall unit currents as the first current eigenvalue; and / or,

[0030] The second current set includes multiple second overall unit currents, and the step of determining a corresponding second current eigenvalue according to at least two second overall unit currents includes:

[0031] Determine the average value of the other current set except the maximum current and the minimum current among the multiple second overall unit currents as the second current eigenvalue.

[0032] In one embodiment, the step of obtaining the current change parameter of the air conditioner includes:

[0033] When the air conditioner does not meet the stable operation condition, and the compressor of the air conditioner is in a preset frequency limit state and reaches the target frequency corresponding to the preset frequency limit state, determine the second rising rate parameter according to the overall unit current data of the air conditioner within the first time period, and determine the third rising rate parameter according to the fan current data of the air conditioner within the second time period.

[0034] In one embodiment, after the step of obtaining the current change parameter of the air conditioner, the following is further included:

[0035] When the first rising rate parameter is less than the first preset threshold, control the air conditioner to maintain the current state of operation; and / or,

[0036] The step of controlling the air conditioner to perform a pressure protection operation includes:

[0037] Control the air conditioner to stop.

[0038] In addition, to achieve the above object, the present application also proposes an air conditioner, which includes: a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the control method of the air conditioner as described above.

[0039] In addition, to achieve the above object, the present application further provides a storage medium, which is a computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, the steps of the control method of the air conditioner as described above are implemented.

[0040] One or more technical solutions proposed by the present application have at least the following technical effects: This solution combines the current change parameters of the air conditioner and the temperature of the condenser in the air conditioner to identify that the system pressure has an abnormal increase, and controls the air conditioner to perform a pressure protection operation, which can achieve early protection when the system pressure abnormally rises, effectively reduce the occurrence of system pressure overlimit phenomena, and improve the reliability of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0042] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0043] Figure 1 It is a schematic diagram of the system structure of the refrigerant system in an embodiment of the air conditioner in the embodiment of the present application;

[0044] Figure 2 It is a schematic diagram of the device structure of the hardware operating environment involved in the control method of the air conditioner in the embodiment of the present application;

[0045] Figure 3 It is a schematic flowchart provided in the first embodiment of the control method of the air conditioner in the present application;

[0046] Figure 4 It is a schematic flowchart provided in the second embodiment of the control method of the air conditioner in the present application.

[0047] The implementation, functional features, and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0049] To better understand the technical solutions of the present application, the following will be described in detail in combination with the accompanying drawings of the specification and the specific embodiments.

[0050] The main solution of the embodiment of this application is: obtaining the current change parameter of the air conditioner and the first temperature of the heat exchanger in the condensation state in the air conditioner; controlling the air conditioner to perform a pressure protection operation when the current change parameter and the first temperature meet a preset condition; wherein, the preset condition indicates that the system pressure of the air conditioner is in an abnormal rising state.

[0051] In this embodiment, for the convenience of description, the air conditioner is used as the execution subject for the following elaboration.

[0052] In the related art, when there is no pressure switch in the refrigerant system of the air conditioner, generally, the abnormal exhaust temperature of the compressor or the compressor itself is overloaded and protected and shuts down. Such a method has the situation of untimely response, resulting in the system pressure exceeding the maximum allowable pressure, affecting the reliability of the air conditioner.

[0053] This application provides the above solution. By combining the current change parameter of the air conditioner and the temperature of the condenser in the air conditioner, it is recognized that the system pressure has an abnormal rise, and the air conditioner is controlled to perform a pressure protection operation, which can realize early protection when the system pressure abnormally rises, effectively reduce the occurrence of the phenomenon of system pressure exceeding the limit, and improve the reliability of the air conditioner.

[0054] The embodiment of this application proposes an air conditioner. The air conditioner can be an integrated air conditioner (such as a mobile air conditioner or a window air conditioner, etc.) or a split air conditioner (such as a wall-mounted air conditioner, a ceiling-mounted air conditioner, a floor-standing air conditioner, a multi-connected air conditioner, etc.), and so on.

[0055] In this embodiment, with reference to Figure 1 and Figure 2 , the air conditioner includes a refrigerant system 200 and a control device 100. The refrigerant system 200 includes a compressor 21 and a first heat exchanger 22, a throttling device 23, and a second heat exchanger 24 that are connected in sequence. A first fan 25 can be correspondingly arranged for the first heat exchanger 22, and the first fan 25 can drive the air in its environment to exchange heat with the first heat exchanger 22. A second fan 26 can be correspondingly arranged for the second heat exchanger 24, and the second fan 26 can drive the air in its environment to exchange heat with the second heat exchanger 24.

[0056] In this embodiment, the first heat exchanger 22 is arranged outdoors, and the second heat exchanger 24 is arranged indoors. In other embodiments, both the first heat exchanger 22 and the second heat exchanger 24 can be arranged indoors.

[0057] In one implementation, the exhaust port of the compressor 21, the first heat exchanger 22, the throttling device 23, the second heat exchanger 24, and the suction port of the compressor 21 are connected in sequence.

[0058] In another implementation, the refrigerant system 200 further includes a reversing component 22 (such as a four-way valve, etc.). The exhaust port of the compressor 21, the suction port of the compressor 21, the first heat exchanger 22, and the second heat exchanger 24 are all connected to the reversing component 22. The reversing component 22 has a first operating state and a second operating state. When the reversing component 22 operates in the first operating state, the exhaust port of the compressor 21 is communicated with the first heat exchanger 22 and the suction port of the compressor 21 is communicated with the second heat exchanger 24. When the reversing component 22 operates in the second operating state, the exhaust port of the compressor 21 is communicated with the second heat exchanger 24 and the suction port of the compressor 21 is communicated with the first heat exchanger 22.

[0059] In this embodiment, a pressure switch is not provided in the refrigerant system.

[0060] The air conditioner further includes a temperature detection module 01, which can be arranged on the first heat exchanger 22 and / or the second heat exchanger 24 to detect the temperature of the heat exchanger.

[0061] The air conditioner further includes an environment detection module 02, which can be arranged in the environment where the air conditioner is located (indoor environment and / or outdoor environment) to detect the environmental state parameters of the environment where the air conditioner is located (such as at least one of environmental temperature, environmental humidity, environmental enthalpy value, etc.).

[0062] Refer to Figure 2 , the above-mentioned compressor 21, the first fan 25, the second fan 26, the reversing component 22, the temperature detection module 01, and the environment detection module 02, etc. are all communicatively connected to the control device 100.

[0063] Among them, the control device 100 includes: at least one processor 1001; and a memory 1002 communicatively connected to the at least one processor 1001, and a timer 1003, etc.; among them, the memory 1002 stores instructions executable by the at least one processor 1001, and the instructions are executed by the at least one processor 1001 to enable the at least one processor 1001 to execute the control method of the air conditioner in the following embodiments.

[0064] Next, refer to Figure 2, which shows a schematic structural diagram of the control device 100 suitable for implementing the embodiments of the present application. The control device 100 in the embodiments of the present application may include, but is not limited to, mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 2 The illustrated control device 100 is merely an example and should not impose any limitations on the functions and usage scope of the embodiments of the present application.

[0065] As Figure 2 shown, the control device 100 may include a processor 1001 (such as a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to the programs stored in the memory 1002. Here, the programs in the memory 1002 may be programs in a read-only memory (ROM: Read Only Memory) or programs loaded from a storage device into a random access memory (RAM: Random Access Memory). In the RAM, various programs and data required for the operation of the control device 100 are also stored. The processor 1001 and the memory 1002 (ROM and RAM) are connected to each other through a bus. An input / output (I / O) interface is also connected to the bus. Generally, the following systems may be connected to the I / O interface: input devices including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; output devices including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; storage devices including, for example, magnetic tapes, hard disks, etc.; and communication devices. The communication device may allow the control device 100 to communicate with other devices wirelessly or wiredly to exchange data. Although the control device 100 with various systems is shown in the figure, it should be understood that it is not required to implement or have all the shown systems. More or fewer systems may be alternatively implemented or had.

[0066] In particular, according to the embodiments disclosed in the present application, the method flows described in the following embodiments can be implemented as computer software programs. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program codes for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from the memory 1002. When the computer program is executed by the processor 1001, the above functions defined in the control method of the air conditioner in the embodiments disclosed in the present application are executed.

[0067] The air conditioner provided by the present application adopts the control method of the air conditioner in the following embodiments, and can solve the technical problem of how to reduce the occurrence of system pressure overlimit phenomena and improve the reliability of the air conditioner. Compared with the prior art, the beneficial effects of the air conditioner provided by the present application are the same as those of the control method of the air conditioner provided in the following embodiments, and other technical features in the air conditioner are the same as those disclosed in the method of the following embodiments, which will not be elaborated here.

[0068] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication, and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device, an air conditioner, etc. that can implement the above functions. Hereinafter, the air conditioner will be used as an example to illustrate this embodiment and the following embodiments.

[0069] Based on this, the embodiments of the present application provide a control method for an air conditioner, referring to Figure 3 , Figure 3 which is a schematic flowchart of the first embodiment of the control method for the air conditioner of the present application.

[0070] In this embodiment, the control method of the air conditioner includes steps S10 to S20:

[0071] Step S10, obtaining the current change parameter of the air conditioner and the first temperature of the heat exchanger in the air conditioner in a condensing state;

[0072] The current change parameter is a parameter reflecting the current change situation of the air conditioner. The current change parameter may include at least one of the following: compressor current change parameter, whole machine current change parameter, fan current change parameter, etc. The type of the current change parameter can be a preset fixed type or a type determined according to the actual operating state of the air conditioner. In this embodiment, the current change parameter is obtained according to the operating state of the air conditioner, and the operating state may include at least one of the following: whether the refrigerant system is in a stable operating state, whether the compressor is in a frequency limit state (the compressor needs to operate within a frequency range less than or equal to the protection frequency or the compressor reduces frequency or prohibits frequency increase, etc.), etc.

[0073] In this embodiment, the operation of the air conditioner is controlled so that the first heat exchanger is in a condensing state and the second heat exchanger is in an evaporating state. The second heat exchanger can be arranged indoors to exchange heat with indoor air. Based on this, the temperature of the first heat exchanger can be obtained as the first temperature. The temperature of the first heat exchanger can include at least one of the following: the inlet temperature of the first heat exchanger, the outlet temperature of the first heat exchanger, the middle temperature of the first heat exchanger, and so on. In this embodiment, the temperature of the first heat exchanger is the outlet temperature of the first heat exchanger.

[0074] Step S20: When the current change parameter and the first temperature meet the preset conditions, control the air conditioner to perform a pressure protection operation; wherein, the preset conditions indicate that the system pressure of the air conditioner is in an abnormal rising state.

[0075] The abnormal rising state means that the current system pressure of the air conditioner is not over-limit, but if the current state is maintained for operation, the system pressure will be over-limit after a set time.

[0076] The preset conditions can include the target parameter ranges required for the current change parameter and the first temperature respectively, or the preset conditions can include the target parameter ranges required for the pressure abnormal risk coefficients corresponding to the current change parameter and the first temperature, and so on.

[0077] The preset conditions can be pre-set fixed conditions, or can be conditions determined according to the actual operating state of the air conditioner. The operating state can include at least one of the following: whether the refrigerant system is in a stable operating state, whether the compressor is in a frequency-limiting state (the compressor needs to operate within a frequency range less than or equal to the preset frequency or the compressor reduces frequency, etc.). Different operating states can correspond to different conditions.

[0078] The pressure protection operation is an operation used to limit the continuous increase of the system pressure. It can include at least one of the following: the compressor stops, the operating frequency of the compressor is limited (the frequency is reduced or limited to operate at a frequency less than or equal to the protection frequency, etc.), the opening degree of the electronic expansion valve is increased, the fan speed is increased, and so on.

[0079] In this embodiment, the pressure protection operation includes the shutdown of the air conditioner. When the preset conditions are met, the air conditioner can be controlled to shut down and the air conditioner can be controlled to output corresponding prompt information.

[0080] Wherein, when the preset conditions are not met, the air conditioner can be controlled to maintain the current state for normal operation and / or return to execute step S10.

[0081] This embodiment provides a control method for an air conditioner. By combining the current change parameter of the air conditioner and the temperature of the condenser in the air conditioner, it is recognized that there is an abnormal increase in the system pressure, and the air conditioner is controlled to perform a pressure protection operation, which can achieve early protection when the system pressure abnormally rises, effectively reduce the occurrence of the system pressure exceeding the limit, and improve the reliability of the air conditioner.

[0082] In a feasible implementation manner, the preset condition includes a first condition or a second condition;

[0083] The first condition includes that the first rising rate parameter of the total current of the air conditioner is greater than or equal to a first preset threshold, and the first temperature is greater than or equal to a first preset temperature. The current change parameter includes the first rising rate parameter;

[0084] The second condition includes that the second rising rate parameter of the total current of the air conditioner is greater than or equal to a second preset threshold, the third rising rate parameter of the fan current in the air conditioner is greater than or equal to a third preset threshold, and the first temperature is greater than or equal to a second preset temperature. The current change parameter includes the second rising rate parameter and the third rising rate parameter.

[0085] In this embodiment, the first preset temperature is greater than the second preset temperature, and the first preset threshold is greater than the second preset threshold.

[0086] The first preset temperature, the second preset temperature, the first preset threshold, the second preset threshold, and the third preset threshold can be preset fixed values or thresholds determined according to the actual working conditions of the air conditioner.

[0087] The first rising rate parameter may include at least one of the following: the current rising amplitude within a unit time, the current rising percentage within a preset time, etc. The second rising rate parameter may include at least one of the following: the current rising amplitude within a unit time, the current rising percentage within a preset time, etc. The third rising rate parameter may include at least one of the following: the current rising amplitude within a unit time, the current rising percentage within a preset time, etc.

[0088] The fan current may include the current of the fan corresponding to the heat exchanger in the condensation state and / or the current of the fan corresponding to the heat exchanger in the evaporation state. In this embodiment, the fan current is the current of the fan corresponding to the heat exchanger in the condensation state.

[0089] When the preset conditions include the first condition, after the step of obtaining the current change parameter of the air conditioner, the following steps are further included: when the first rising rate parameter is less than the first preset threshold, it can be considered that the system pressure of the air conditioner is not in an abnormal rising state at this time, control the air conditioner to maintain the current state of operation, and return to execute step S10. When the first rising rate parameter is greater than or equal to the first preset threshold, the first temperature can be obtained. When the first temperature is greater than or equal to the first preset temperature, control the air conditioner to perform a pressure protection operation; when the first temperature is less than the first preset temperature, control the air conditioner to maintain the current state of operation and return to execute step S10.

[0090] When the preset conditions include the second condition, when the second rising rate parameter is less than the second threshold, and / or when the third rising rate parameter is less than the third preset threshold, and / or when the first temperature is less than the second preset temperature, control the air conditioner to maintain the current state of operation and return to execute step S10.

[0091] In this embodiment, by setting the preset conditions in the above manner, the accurate identification of the abnormal rising state of the system pressure can be ensured, the timeliness of the pressure protection of the air conditioner can be further improved, and further, the phenomenon of system pressure exceeding the limit can be reduced, so as to further improve the reliability of the air conditioner.

[0092] In a feasible implementation manner, the control method of the air conditioner further includes: obtaining the ambient temperature of the environment where the air conditioner is located; determining the first preset temperature according to the ambient temperature.

[0093] The ambient temperature may include the indoor ambient temperature and / or the outdoor ambient temperature. In this embodiment, the ambient temperature is the outdoor ambient temperature.

[0094] Different ambient temperatures correspond to different first preset temperatures, and the ambient temperature and the first preset temperature may be negatively correlated. The corresponding relationship between the ambient temperature and the first preset temperature can be preset in advance, and the corresponding relationship may include forms such as a mapping relationship and a relational expression. Based on this corresponding relationship, the first preset temperature corresponding to the current ambient temperature can be determined.

[0095] In one implementation manner, the temperature range where the ambient temperature is located can be determined, and the first preset temperature can be determined according to the temperature range. In another implementation manner, the ambient temperature can be substituted into a preset relational expression to calculate the first preset temperature.

[0096] In this embodiment, when the ambient temperature is greater than or equal to the preset ambient temperature, the first temperature threshold is determined as the first preset temperature; when the ambient temperature is less than the preset ambient temperature, the second temperature threshold is determined as the first preset temperature; wherein, the first temperature threshold is less than the second temperature threshold.

[0097] In this embodiment, the pressure states of the air conditioner when reliability risks occur in different ambient temperature states are different. Based on this, a first preset temperature is set according to the ambient temperature, which is beneficial to further improving the timeliness of the execution of the pressure protection operation and realizing further improvement of the reliability of the air conditioner.

[0098] In some implementation manners, a second preset temperature may also be determined according to the ambient temperature, and the ambient temperature is negatively correlated with the second preset temperature.

[0099] Based on any of the above embodiments, in the second embodiment of the present application, the same or similar content as the above embodiments can be referred to the above introduction and will not be repeated hereinafter. On this basis, please refer to Figure 4 , before step S20, it further includes:

[0100] Step S01, when the air conditioner meets the stable operation condition, determining that the preset condition includes the first condition;

[0101] Step S02, when the air conditioner does not meet the stable operation condition and the compressor of the air conditioner is in a preset frequency limit state, determining that the preset condition includes the second condition.

[0102] The stable operation condition indicates that the air conditioner is currently in a stable operation state. Among them, the stable operation condition includes at least one of the following: the frequency deviation value between the target frequency and the actual frequency of the compressor in the air conditioner is less than or equal to a preset threshold, the rotation speed of the fan in the air conditioner is greater than or equal to a preset rotation speed, and the rotation speed of the fan in the air conditioner does not decrease. The frequency deviation value is the absolute value of the difference between the target frequency and the actual frequency, and the preset threshold is greater than 0. The fan may include the fan corresponding to the heat exchanger in the condensation state and / or the fan corresponding to the heat exchanger in the evaporation state. In this embodiment, when the frequency deviation value between the target frequency and the actual frequency of the compressor in the air conditioner is less than or equal to the preset threshold, and the rotation speed of the fan in the air conditioner is greater than or equal to the preset rotation speed, and the rotation speed of the fan in the air conditioner does not decrease and the duration is greater than or equal to a preset duration, the stable operation condition is met.

[0103] The preset frequency limit state includes that the air conditioner reduces the frequency or prohibits the frequency increase or operates at a frequency less than or equal to the corresponding protection frequency when meeting the set conditions. The set conditions are the conditions that need to be met for the operating parameters of the air conditioner itself and / or the environmental parameters of the environment where the air conditioner is located to protect the air conditioner when restricting the operation of the compressor. In this embodiment, the set conditions include the overcurrent protection condition, and the overcurrent protection condition may include that the total current of the air conditioner is greater than the upper current threshold.

[0104] The execution order of step S01 or step S02 and the above step S10 is not limited.

[0105] In this embodiment, when the air conditioner is in a stable operation state, the system pressure is identified for abnormal rise by combining the rising rate of the whole-machine current and the temperature of the condenser. When the air conditioner is in a frequency-limiting state, the system pressure is identified for abnormal rise by combining the rising rate of the whole-machine current, the temperature of the condenser, and the rising rate of the fan current, which can ensure accurate identification of abnormal rise of the system pressure whether the compressor is in a stable operation state or a frequency-limiting state, further reduce the risk of system pressure exceeding the limit, and further improve the operation reliability of the air conditioner.

[0106] In other embodiments, when the compressor of the air conditioner is in a preset frequency-limiting state, it can be determined that the preset condition includes a second condition; when the compressor of the air conditioner is not in a preset frequency-limiting state, it can be determined that the preset condition includes a first condition. Alternatively, when the air conditioner does not meet the stable operation condition, it can be determined that the preset condition includes a second condition.

[0107] In other embodiments, the set condition may also include that the exhaust temperature of the compressor is greater than the upper limit exhaust temperature.

[0108] In a feasible implementation manner, the step of obtaining the current change parameter of the air conditioner includes: when the air conditioner meets the stable operation condition, successively obtaining a first current set and a second current set of the air conditioner, where the first current set includes at least two first whole-machine currents, and the second current set includes at least two second whole-machine currents; determining a corresponding first current characteristic value according to at least two first whole-machine currents, and determining a corresponding second current characteristic value according to at least two second whole-machine currents; determining the first rising rate parameter according to the first current characteristic value and the second current characteristic value.

[0109] The interval duration between adjacent detections of at least two first whole-machine currents is a set duration, and the interval duration between adjacent detections of at least two second whole-machine currents is a set duration. In this embodiment, the number of whole-machine currents in the first current set is the same as the number of whole-machine currents in the second current set. In some other implementation manners, the number of whole-machine currents in the first current set may be greater than or less than the number of whole-machine currents in the second current set.

[0110] The first current characteristic value may include at least one of the following: the average value of at least two first whole-machine currents, the maximum value of at least two first whole-machine currents, the minimum value of at least two first whole-machine currents, and so on.

[0111] The second current characteristic value may include at least one of the following: the average value of at least two second whole-machine currents, the maximum value of at least two second whole-machine currents, the minimum value of at least two second whole-machine currents, and so on.

[0112] In this embodiment, the first current set includes multiple first overall unit currents, and the average value of the other current sets except the maximum current and the minimum current among the multiple first overall unit currents is determined as the first current eigenvalue. The second current set includes multiple second overall unit currents, and the average value of the other current sets except the maximum current and the minimum current among the multiple second overall unit currents is determined as the second current eigenvalue.

[0113] In this embodiment, if the first current set is detected first and then the second current set is detected, the ratio of the second current eigenvalue to the first current eigenvalue can be determined, and the difference between this ratio and 1 is determined as the first current rise percentage; alternatively, the difference between the second current eigenvalue and the first current eigenvalue is determined, and the ratio of this difference to the first eigenvalue is determined as the first current rise percentage. The first current rise ratio can be used as the first rise rate parameter, and the first preset threshold is greater than 0. In some other implementation manners, the difference between the second current eigenvalue and the first current eigenvalue can also be used as the first above-mentioned rate parameter.

[0114] In this embodiment, through the above method, it is ensured that the first rise rate parameter can accurately characterize whether there is an abnormal rise in the system pressure, thereby further improving the accuracy of the execution timing of the pressure protection operation and realizing a further improvement in the system reliability.

[0115] In a feasible embodiment, the step of obtaining the current change parameter of the air conditioner includes: when the air conditioner does not meet the stable operation condition and the compressor of the air conditioner is in the preset frequency limit state and reaches the target frequency corresponding to the preset frequency limit state, determining the second rise rate parameter according to the overall unit current data of the air conditioner within the first time period, and determining the third rise rate parameter according to the fan current data of the air conditioner within the second time period.

[0116] In this embodiment, the preset frequency limit state includes the state in which the air conditioner reduces its frequency when the overcurrent protection condition is met. Then, when the compressor is in the preset frequency limit state and the frequency of the compressor drops to the target frequency required for overcurrent protection, the whole-machine current data within the first duration and the fan current data within the second duration can be detected. Both the first duration and the second duration are timed from the initial moment when the frequency of the compressor drops to the target frequency required for overcurrent protection. Among them, the whole-machine current and the fan current can be detected at the initial moment to obtain the initial whole-machine current and the initial fan current. The whole-machine current is detected when the timing duration reaches the first duration to obtain the third whole-machine current, and the fan current is detected when the timing duration reaches the second duration to obtain the first fan current. The second rising rate parameter (such as the second current rising percentage, etc.) is determined according to the third whole-machine current and the initial whole-machine current, and the third rising rate parameter (such as the third current rising percentage, etc.) is determined according to the first fan current and the initial fan current. The second current rising percentage and the third current rising percentage can be determined by analogy with the method for determining the above-mentioned first current rising percentage, which will not be elaborated here.

[0117] The first duration and the second duration can be preset fixed durations, or can be durations determined according to the actual operating conditions of the air conditioner. For example, the first duration and the second duration can be determined according to the target frequency and / or the current deviation value between the upper-limit current and the whole-machine current when the overcurrent protection condition is met, and so on.

[0118] In this embodiment, through the above method, it can be ensured that the second rising rate parameter and the third rising rate parameter in the frequency limit state of the air conditioner can accurately characterize whether there is an abnormal rise in the system pressure, thereby further improving the accuracy of the execution timing of the pressure protection operation and realizing a further improvement in system reliability.

[0119] It should be noted that the above examples are only for understanding the present application and do not constitute a limitation on the control method of the air conditioner of the present application. Based on this technical concept, more forms of simple transformations are within the protection scope of the present application.

[0120] The present application provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, and the computer-readable program instructions are used to execute the control method of the air conditioner in the above embodiment.

[0121] The computer-readable storage medium provided by the present application can be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination of the above. More specific examples of the computer-readable storage medium may include, but are not limited to: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM) or flash memory, optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this embodiment, the computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, device, or component. The program code contained on the computer-readable storage medium can be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0122] The above computer-readable storage medium can be included in an air conditioner; or it can exist independently without being assembled into the air conditioner.

[0123] The above computer-readable storage medium carries one or more programs. When the one or more programs are executed by the air conditioner, the air conditioner is caused to perform the following processes: obtaining the current change parameter of the air conditioner and the first temperature of the heat exchanger in the condensation state in the air conditioner; controlling the air conditioner to perform a pressure protection operation when the current change parameter and the first temperature meet a preset condition; wherein the preset condition indicates that the system pressure of the air conditioner is in an abnormal rising state.

[0124] Computer program code for performing the operations of this application can be written in one or more programming languages or combinations thereof. The above-mentioned programming languages include object-oriented programming languages such as Java, Smalltalk, C++, and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, executed as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (for example, by connecting through the Internet using an Internet service provider).

[0125] The readable storage medium provided by this application is a computer-readable storage medium. The computer-readable storage medium stores computer-readable program instructions (i.e., computer programs) for performing the above-mentioned control method of the air conditioner, and can solve the technical problems of reducing the occurrence of system pressure over-limit phenomena and improving the reliability of the air conditioner. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this application are the same as those of the control method of the air conditioner provided by the above-mentioned embodiment, and will not be elaborated here.

[0126] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of the code, and this module, program segment, or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0127] It should be understood that each part disclosed in this application can be implemented by hardware, software, firmware, or a combination thereof. The modules described in the embodiments of this application can be implemented in software or in hardware. Among them, the name of the module does not constitute a limitation on the unit itself in some cases. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0128] The above are only some embodiments of this application, and thus do not limit the patent scope of this application. Any equivalent structural transformation made under the technical concept of this application by using the content of the specification and drawings of this application, or direct / indirect application in other related technical fields, is included in the patent protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A method for controlling an air conditioner, characterized in that: The control method of the air conditioner comprises: Acquire a current variation parameter of the air conditioner and a first temperature of a heat exchanger in a condensing state in the air conditioner; When the current variation parameter and the first temperature meet a preset condition, controlling the air conditioner to perform a pressure protection operation; The preset condition indicates that the system pressure of the air conditioner is in an abnormally rising state.

2. The air conditioner control method according to claim 1, characterized in that: The preset condition includes the first condition or the second condition; The first condition includes that a first rising rate parameter of the whole current of the air conditioner is greater than or equal to a first preset threshold value, and the first temperature is greater than or equal to a first preset temperature, and the current change parameter includes the first rising rate parameter; The second condition includes that the second rising rate parameter of the whole current of the air conditioner is greater than or equal to the second preset threshold, the third rising rate parameter of the fan current in the air conditioner is greater than or equal to the third preset threshold, and the first temperature is greater than or equal to the second preset temperature, and the current change parameter includes the second rising rate parameter and the third rising rate parameter.

3. The air conditioner control method according to claim 2, characterized in that: The control method of the air conditioner also includes: Obtaining the ambient temperature of the environment where the air conditioner is located; The first preset temperature is determined according to the ambient temperature.

4. The air conditioner control method according to claim 3, characterized in that: The step of determining the first preset temperature according to the ambient temperature comprises: When the ambient temperature is greater than or equal to the preset ambient temperature, determining the first temperature threshold to be the first preset temperature; When the ambient temperature is lower than the preset ambient temperature, determining the second temperature threshold to be the first preset temperature; The first temperature threshold is lower than the second temperature threshold.

5. The air conditioner control method according to claim 2, characterized in that: Before the step of controlling the air conditioner to perform a pressure protection operation when the current variation parameter and the first temperature meet a preset condition, the method further includes: In the case where the air conditioner meets the stable operation condition, determining that the preset condition includes the first condition; In a case where the air conditioner does not meet the stable operation condition and the compressor of the air conditioner is in a preset frequency limiting state, it is determined that the preset condition includes the second condition.

6. The control method of the air conditioner according to claim 5, characterized in that: The preset frequency limiting state includes that the compressor reduces the frequency or prohibits frequency increase or operates at a frequency less than or equal to the corresponding protection frequency when the overcurrent protection condition is met.

7. The air conditioner control method according to claim 5, characterized in that: The stable operating conditions include at least one of the following: a frequency deviation value between a target frequency of the compressor in the air conditioner and an actual frequency of the compressor is less than or equal to a preset threshold, a speed of a fan in the air conditioner is greater than or equal to a preset speed, and a speed of the fan in the air conditioner does not decrease.

8. The method for controlling an air conditioner according to any one of claims 2 to 7, characterized in that: The step of obtaining the current variation parameter of the air conditioner comprises: When the air conditioner meets the stable operation condition, successively acquiring a first current set and a second current set of the air conditioner, wherein the first current set includes at least two first whole machine currents, and the second current set includes at least two second whole machine currents; Determine a corresponding first current characteristic value according to at least two first whole machine currents, and determine a corresponding second current characteristic value according to at least two second whole machine currents; The first rising rate parameter is determined according to the first current characteristic value and the second current characteristic value.

9. The air conditioner control method according to claim 8, characterized in that: The first current set includes a plurality of first whole machine currents, and the step of determining a corresponding first current characteristic value according to at least two first whole machine currents includes: Determine an average value of a set of currents other than the maximum current and the minimum current among the plurality of first whole machine currents as the first current characteristic value; and / or, The second current set includes a plurality of second whole machine currents, and the step of determining a corresponding second current characteristic value according to at least two second whole machine currents includes: An average value of a set of currents other than the maximum current and the minimum current among the plurality of second whole machine currents is determined as the second current characteristic value.

10. The air conditioner control method according to any one of claims 2 to 7, characterized in that: The step of obtaining the current variation parameter of the air conditioner comprises: When the air conditioner does not meet the stable operation conditions and the compressor of the air conditioner is in a preset frequency limiting state and reaches the target frequency corresponding to the preset frequency limiting state, the second rising rate parameter is determined according to the whole machine current data of the air conditioner within the first time period, and the third rising rate parameter is determined according to the fan current data of the air conditioner within the second time period.

11. The air conditioner control method according to any one of claims 2 to 7, characterized in that: After the step of obtaining the current variation parameter of the air conditioner, the method further includes: When the first rising rate parameter is less than the first preset threshold, controlling the air conditioner to maintain the current state of operation; and / or, The step of controlling the air conditioner to perform a pressure protection operation comprises: The air conditioner is controlled to stop.

12. An air conditioner, characterized in that: The air conditioner comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the air conditioner control method according to any one of claims 1 to 11.

13. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the air conditioner control method according to any one of claims 1 to 11 are implemented.

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