Control method of air conditioner and related device

Abstract

The embodiment of the application discloses a control method of an air conditioner and related equipment, wherein the control method of the air conditioner comprises the following steps: acquiring a compressor suction pressure; determining an operation state of an evaporator based on the compressor suction pressure; and adjusting a control parameter of the compressor based on the operation state of the evaporator. The control method provided by the embodiment of the application can obtain the operation state of the evaporator in the room only by the compressor suction pressure, does not need to depend on the communication relationship between the evaporator and the compressor, does not need to depend on the communication relationship between the evaporator and the condenser, can still protect the evaporator in the case that the evaporator cannot communicate with the compressor, greatly improves the cost of air conditioner control, and is beneficial to improving the compatibility of the air conditioner.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of air conditioners, and in particular, to an air conditioner control method, an air conditioner control device, a computer readable storage medium, and an air conditioner. BACKGROUND

[0002] If the evaporator temperature is too low during use of the air conditioner, the evaporator will produce too much condensate water, and the condensate water will even freeze due to the influence of low temperature, affecting the refrigeration efficiency and service life of the air conditioner. In the current technology, a temperature sensor is only arranged on the evaporator to detect the temperature of the evaporator. However, when the evaporator and the outdoor unit do not have a communication relationship or the temperature sensor at the evaporator is damaged, the outdoor unit cannot obtain the operating state of the evaporator, and thus cannot perform low-temperature protection of the evaporator. SUMMARY

[0003] The present application aims to at least solve one of the problems in the prior art or related art.

[0004] To this end, a first aspect of the present application provides an air conditioner control method.

[0005] A second aspect of the present application provides an air conditioner control device.

[0006] A third aspect of the present application provides a computer readable storage medium.

[0007] A fourth aspect of the present application provides an air conditioner.

[0008] Therefore, according to a first aspect of embodiments of the present application, an air conditioner control method is provided, comprising:

[0009] obtaining a compressor suction pressure;

[0010] determining an operating state of an evaporator based on the compressor suction pressure;

[0011] adjusting a control parameter of the compressor based on the operating state of the evaporator.

[0012] In a feasible implementation, the step of determining the operating state of the evaporator based on the compressor suction pressure comprises:

[0013] obtaining a suction saturation temperature of the compressor based on the compressor suction pressure;

[0014] determining the operating state of the evaporator based on the suction saturation temperature.

[0015] In an embodiment, the step of determining the operation state of the evaporator based on the suction saturation temperature of the compressor comprises:

[0016] When the suction saturation temperature is less than a first threshold value and greater than or equal to a second threshold value, the operation state is determined as a first operation state.

[0017] The step of adjusting the control parameter of the compressor based on the operation state of the evaporator comprises:

[0018] When the operation state is the first operation state, the operation frequency of the compressor is decreased.

[0019] In an embodiment, the step of decreasing the operation frequency of the compressor comprises:

[0020] The operation frequency of the compressor is decreased by a first percentage every preset period.

[0021] In an embodiment, the step of decreasing the operation frequency of the compressor further comprises:

[0022] An operation mode of the air conditioner is obtained.

[0023] When the air conditioner is in a cooling mode and the frequency of the compressor is lower than a third threshold value, the frequency adjustment of the compressor is stopped.

[0024] When the air conditioner is in a heating mode and the frequency of the compressor is lower than a fourth threshold value, the frequency adjustment of the compressor is stopped.

[0025] The fourth threshold value is greater than the third threshold value.

[0026] In an embodiment, the step of determining the operation state of the evaporator based on the suction saturation temperature of the compressor comprises:

[0027] When the suction saturation temperature is less than a second threshold value, the operation state is determined as a second operation state.

[0028] The step of adjusting the control parameter of the compressor based on the operation state of the evaporator comprises:

[0029] When the operation state is the second operation state, the compressor is controlled to stop.

[0030] In an embodiment, the step of controlling the compressor to stop when the operation state is the second operation state comprises:

[0031] A continuous time length during which the evaporator continuously operates in the second operation state is detected.

[0032] in a case that the continuous duration exceeds a first duration and the continuous running duration of the compressor exceeds a second duration, controlling the compressor to stop;

[0033] The method further comprises:

[0034] in a case that the compressor is controlled to stop, generating an evaporator low-temperature fault alarm.

[0035] In an available implementation, the control method further comprises:

[0036] in a case that the compressor is controlled to stop for more than a third duration, controlling the compressor to start and issuing a fault clearing information.

[0037] According to a second aspect of the embodiments of the present application, a control device of an air conditioner is provided, comprising:

[0038] a memory, which stores a computer program;

[0039] a processor, which executes the computer program;

[0040] The processor, when executing the computer program, implements the control method of any of the above technical solutions.

[0041] According to a third aspect of the embodiments of the present application, a computer readable storage medium is provided, which stores a computer program, and implements the control method of any of the above technical solutions.

[0042] According to a third aspect of the embodiments of the present application, an air conditioner is provided, comprising the control device of the above technical solution.

[0043] Compared with the prior art, the present application at least has the following beneficial effects: the control method of the air conditioner provided by the embodiments of the present application acquires the suction pressure of the compressor, and then judges the working state of the evaporator based on the suction pressure of the compressor, and adjusts the control parameter of the compressor based on the working state of the evaporator, so that the working parameter of the compressor can be adapted to the working state of the evaporator, and the evaporator can be protected, especially when the temperature of the evaporator is too low, the control parameter of the compressor can be actively adjusted to reduce the temperature of the evaporator, and the protection of the evaporator is realized. The control method provided by the embodiments of the present application acquires the suction pressure of the compressor, and only needs to acquire the working state of the evaporator in the room through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, the cost of air conditioner control is greatly improved, and the compatibility of the air conditioner is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the present application. Furthermore, the same reference numerals in different drawings identify the same elements. In the drawings:

[0045] Figure 1 a schematic step flow chart of a control method of an air conditioner according to an embodiment of the present application;

[0046] Figure 2 a schematic step flow chart of a control method of an air conditioner according to another embodiment of the present application;

[0047] Figure 3 a schematic step flow chart of a control method of an air conditioner according to yet another embodiment of the present application;

[0048] Figure 4 a structural block diagram of a control device of an air conditioner according to an embodiment of the present application;

[0049] Figure 5 a structural block diagram of a computer readable storage medium according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to better understand the above technical solutions, the technical solutions of the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific features in the embodiments of the present application and the embodiments are detailed descriptions of the technical solutions of the embodiments of the present application, and are not limitations of the technical solutions of the present application. In the case of no conflict, the technical features in the embodiments of the present application and the embodiments can be combined with each other.

[0051] According to a first aspect of the embodiments of the present application, a control method of an air conditioner is provided, comprising:

[0052] Step 101: obtaining the suction pressure of the compressor. A pressure sensor can be arranged at the suction port of the compressor, which can directly detect and obtain the suction pressure of the compressor, so that the obtaining of the suction pressure of the compressor is simple and direct, the accuracy of the original data can be guaranteed, and the controller of the air conditioner can be conveniently collected and obtained.

[0053] Step 102: determining the working state of the evaporator based on the suction pressure of the compressor. It can be understood that the greater the obtained suction pressure value of the compressor, the higher the temperature of the evaporator, and the lower the suction pressure value of the compressor, the lower the temperature of the evaporator. Based on this, the working state of the evaporator can be determined by the suction pressure of the compressor.

[0054] Step 103: adjusting the control parameter of the compressor based on the working state of the evaporator. The control parameter of the compressor is determined based on the working state of the evaporator, which can make the working parameter of the compressor adapt to the working state of the evaporator, and protect the evaporator, especially when the temperature of the evaporator is too low, the control parameter of the compressor can be adjusted to reduce the temperature of the evaporator, thereby protecting the evaporator.

[0055] The control method of the air conditioner provided by the embodiment of the present application takes into account that in some cases, the evaporator in the room may not have a communication connection with the compressor and the condenser outside the room, and on this basis, the temperature of the evaporator detected by the temperature sensor arranged at the evaporator cannot be transmitted to the compressor, and the working frequency of the compressor cannot be adapted to the temperature of the evaporator, and the evaporator cannot be protected from low temperature.

[0056] It can be understood that in some examples, the air conditioner can be connected to the evaporator, the condenser and the compressor through a controller, in which case if the temperature sensor at the evaporator is damaged, the controller cannot obtain the temperature of the evaporator, at which time the working state of the evaporator can be protected by collecting the suction pressure of the compressor through the control method provided by the present application; the air conditioner can also include an indoor controller and an outdoor controller, the indoor controller is connected to the evaporator, and the outdoor controller is connected to the compressor and the condenser, so that when the outdoor controller and the indoor controller do not have a connection relationship, the outdoor controller cannot collect the temperature of the evaporator in the room, in which case the outdoor controller can collect the suction pressure of the compressor to protect the working state of the evaporator.

[0057] On this basis, the control method of the air conditioner provided in the application first acquires the suction pressure of the compressor, then judges the working state of the evaporator based on the suction pressure of the compressor, and then adjusts the control parameter of the compressor based on the working state of the evaporator, so that the working parameter of the compressor can be adapted to the working state of the evaporator, and the evaporator can be protected, especially when the temperature of the evaporator is too low, the control parameter of the compressor can be actively adjusted to reduce the temperature of the evaporator, and the protection of the evaporator is realized. The control method provided in the embodiments of the application acquires the suction pressure of the compressor, and only needs to acquire the working state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor or the temperature sensor at the evaporator is damaged, the evaporator can still be protected, greatly improving the cost of air conditioner control, and being conducive to improving the compatibility of the air conditioner without relying on the communication relationship between the evaporator, the compressor and the condenser. In the case that the evaporator and the compressor and the controller of the air conditioner do not have a communication relationship, the evaporator can still be protected, greatly improving the cost of air conditioner control, and being conducive to improving the compatibility of the air conditioner.

[0058] It can be understood that in the prior art, in order to reduce the noise of the air conditioner, the compressor is usually arranged outdoors, and when the signal transmitter of the evaporator is damaged, the evaporator can not be able to communicate with the compressor. When the evaporator is connected to the outdoor compressor by a wired manner, the damage or breakage of the cable can also cause the evaporator to be unable to communicate with the compressor. Similarly, if the compressor and the evaporator come from different suppliers, i.e. the compressor and the indoor evaporator belong to different brands, there is also a possibility that they cannot communicate with each other. Based on this, the application only needs to acquire the working state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, greatly improving the cost of air conditioner control, and being conducive to improving the compatibility of the air conditioner.

[0059] The control method provided in the application takes into account that the temperature change speed of the medium in the passage between the evaporator and the suction port of the compressor is relatively fast, and in the case that the evaporator and the outdoor compressor do not have a communication connection relationship, the outdoor compressor cannot acquire the temperature at the outlet of the evaporator, and the pressure fluctuation of the medium between the evaporator and the suction port of the compressor is relatively small. Therefore, collecting the suction pressure of the compressor can be equivalent to the working temperature of the evaporator.

[0060] In some examples, the step of determining the operation state of the evaporator based on the compressor suction pressure comprises: obtaining a suction saturation temperature of the compressor based on the compressor suction pressure; and determining the operation state of the evaporator based on the suction saturation temperature.

[0061] The suction saturation temperature of the compressor can be obtained based on the compressor suction pressure. The suction saturation temperature can represent the temperature of the evaporator in the indoor space. It can be understood that the lower the suction saturation temperature, the lower the temperature of the evaporator, and the higher the suction saturation temperature, the higher the temperature of the evaporator. After the compressor suction pressure is equivalent to the temperature, the operation state of the evaporator is determined, which is more intuitive and accurate.

[0062] It can be understood that there is a corresponding relationship between the pressure and the saturation temperature of the medium. After the suction pressure of the compressor is obtained by the pressure sensor, the suction saturation temperature of the compressor can be determined based on the corresponding relationship between the pressure and the saturation temperature of the medium.

[0063] In some examples, the step of determining the operation state of the evaporator based on the suction saturation temperature of the compressor comprises: determining that the operation state is a first operation state when the suction saturation temperature is less than a first threshold value and greater than or equal to a second threshold value.

[0064] The first threshold value and the second threshold value can be set. The operation state of the evaporator is determined by comparing the suction saturation temperature with the threshold values, which can simplify the processing amount of the processor of the air conditioner and improve the response efficiency of the air conditioner.

[0065] When the suction saturation temperature is less than the first threshold value and greater than or equal to the second threshold value, it indicates that the operation temperature of the evaporator in the indoor space is low. In this case, the control parameters of the compressor should be adjusted to protect the evaporator at low temperature.

[0066] It can be understood that the second threshold value is less than the first threshold value, and the specific values of the first threshold value and the second threshold value can be related to the type of refrigerant in the air conditioner. The first threshold value can be 0℃ to 5℃, and the second threshold value can be -5℃ to -10℃.

[0067] In some examples, the step of adjusting the control parameters of the compressor based on the operation state of the evaporator comprises: reducing the operation frequency of the compressor when the operation state is the first operation state.

[0068] When the suction saturation temperature is less than the first threshold value and greater than or equal to the second threshold value, it indicates that the operating temperature of the indoor evaporator is low, and in this case, the control parameter of the compressor should be adjusted for low-temperature protection of the evaporator. Reducing the operating frequency of the compressor can reduce the temperature of the evaporator through the circulation of the refrigerant, which can reduce the probability of the evaporator being too low in temperature, avoid water condensation or icing of the evaporator, improve the service life of the evaporator, and improve user experience.

[0069] In some examples, the step of reducing the operating frequency of the compressor includes: reducing the operating frequency of the compressor by a first percentage every preset period.

[0070] The preset period can be set, and the frequency reduction operation of the compressor is performed every preset period. On the one hand, this can avoid a sudden reduction in the frequency of the compressor, allow adjustment and reaction time for the compressor, ensure safe operation of the compressor, and improve the service life of the compressor. On the other hand, controlling the frequency adjustment of the compressor in the form of a percentage can gradually reduce the frequency of the compressor, without excessively affecting the refrigeration or heating effect of the air conditioner, avoiding excessive fluctuations in the indoor ambient temperature, and improving user experience.

[0071] In some examples, the preset period can be 20s to 50s, and the first percentage can be 10% to 20%. Such settings can avoid a sudden reduction in the frequency of the compressor, allow adjustment and reaction time for the compressor, ensure safe operation of the compressor, and improve the service life of the compressor. Gradually reducing the frequency of the compressor can not excessively affect the refrigeration or heating effect of the air conditioner, avoid excessive fluctuations in the indoor ambient temperature, and improve user experience.

[0072] In some examples, the step of reducing the operating frequency of the compressor further includes: obtaining the operating mode of the air conditioner; stopping the frequency adjustment of the compressor when the air conditioner is in a cooling mode and the frequency of the compressor is lower than a third threshold value; stopping the frequency adjustment of the compressor when the air conditioner is in a heating mode and the frequency of the compressor is lower than a fourth threshold value; and the fourth threshold value is greater than the third threshold value.

[0073] It is considered that if the frequency of the compressor is reduced without limitation, the compressor will not be able to perform normal refrigeration and heating operation, which will affect user experience. Therefore, the operating mode of the air conditioner is obtained first, and then the minimum frequency of the compressor is controlled based on the different operating modes, which can ensure normal refrigeration and heating of the air conditioner and can ensure user comfort.

[0074] Specifically, in the cooling mode, if the frequency of the compressor is lower than the third threshold value, the compressor stops reducing the frequency, and the compressor can be maintained at the current operating frequency.

[0075] Specifically, in the heating mode, if the frequency of the compressor is lower than the fourth threshold value, the compressor stops reducing the frequency, and the compressor can be maintained at the current operating frequency.

[0076] The fourth threshold value is greater than the third threshold value, which is considered that the cooling efficiency of the air conditioner is relatively higher than the heating efficiency. Therefore, if the air conditioner is in the heating mode, the compressor should be maintained at a certain frequency to ensure the heating efficiency.

[0077] In some examples, the third threshold value can be 15 Hz to 20 Hz, and the fourth threshold value can be 22 Hz to 27 Hz. In this way, the minimum frequency of the operation of the compressor can be set to ensure the cooling or heating effect of the air.

[0078] In some examples, the step of determining the operating state of the evaporator based on the suction saturation temperature of the compressor includes: when the suction saturation temperature is less than the second threshold value, determining that the operating state is the second operating state.

[0079] The second threshold value can be set to determine the operating state of the evaporator by comparing the suction saturation temperature with the threshold value, which can simplify the processing amount of the processor of the air conditioner and improve the response efficiency of the air conditioner.

[0080] When the suction saturation temperature is less than the second threshold value, it indicates that the operating temperature of the evaporator in the room is very low. In this case, the control parameters of the compressor should be adjusted in time to protect the evaporator from low temperature.

[0081] It can be understood that the value of the second threshold value is related to the type of refrigerant in the air conditioner, and the value of the second threshold value can be -5℃ to -10℃.

[0082] In some examples, the step of adjusting the control parameters of the compressor based on the operating state of the evaporator includes: in the case where the operating state is the second operating state, controlling the compressor to stop.

[0083] When the suction saturation temperature is less than the second threshold value, it indicates that the operating temperature of the evaporator in the room is very low. In this case, the compressor can be controlled to stop to adjust the operating state of the evaporator in time, so that the temperature of the evaporator can be adjusted as soon as possible, to avoid the evaporator from being too low in temperature and generating more condensate and icing, to improve the service life of the evaporator and improve the user experience.

[0084] In some examples, when the operation state is the second operation state, the step of controlling the compressor to stop includes: detecting a continuous time length during which the evaporator continuously operates in the second operation state; and controlling the compressor to stop when the continuous time length exceeds a first time length and a continuous running time length of the compressor exceeds a second time length. The method further includes: generating an evaporator low-temperature fault warning when the compressor is controlled to stop.

[0085] The operation time length of the compressor and the time length during which the evaporator operates in the second operation state can be counted. When the operation time length of the compressor exceeds the second time length and the continuous time length during which the evaporator operates in the second operation state exceeds the first time length, it is considered that the evaporator has a very low temperature, and the compressor should be controlled to stop and an evaporator low-temperature fault warning should be generated. Further, the control of the air conditioner can receive the evaporator low-temperature fault warning and display the evaporator low-temperature fault warning on a display screen of the air conditioner.

[0086] The compressor is controlled to stop only when the operation time length of the compressor exceeds the second time length and the continuous time length during which the evaporator operates in the second operation state exceeds the first time length, which can avoid misjudgment caused by low suction pressure of the compressor at the beginning of the air conditioner being turned on, and can improve the stability of the operation of the air conditioner.

[0087] It can be understood that the continuous time length during which the evaporator operates in the second operation state refers to a time period during which the evaporator continuously operates in the second operation state. If the evaporator does not operate in the second operation state at a certain time point, the continuous time length should be reset to zero to avoid misjudgment of the air conditioner.

[0088] In some examples, the second time length is greater than the first time length. The first time length can be 3 min to 6 min, and the second time length can be 10 min to 16 min. Such a setting can reduce the probability of misjudgment of the air conditioner.

[0089] In some examples, the control method further includes: controlling the compressor to start and issuing a fault clearing information after the compressor is stopped for more than a third time length.

[0090] After the compressor is stopped for more than the third time length, it is considered that the temperature of the evaporator in the room can return to a normal value, and therefore the compressor can be controlled to start again to perform refrigeration or heating operation, and the fault clearing information is issued. The control of the air conditioner can receive the evaporator low-temperature fault information and display the evaporator low-temperature fault warning on a display screen of the air conditioner.

[0091] As shown in FIG. 1, Figure 2 In some examples, the control method of the air conditioner provided by the embodiments of the present application includes:

[0092] Step 201: detecting the suction pressure of the compressor and obtaining the suction saturation temperature based on the suction pressure of the compressor. A pressure sensor can be arranged at the suction port of the compressor, which can directly detect the suction pressure of the compressor, so that the suction pressure of the compressor is simple and direct to obtain, which can guarantee the accuracy of the original data and facilitate the controller of the air conditioner to collect and obtain. Based on the suction pressure of the compressor, the suction saturation temperature of the compressor can be obtained, and the suction saturation temperature can represent the temperature of the indoor evaporator. It can be understood that the lower the suction saturation temperature, the lower the temperature of the evaporator, and the higher the suction saturation temperature, the higher the temperature of the evaporator. After the suction pressure of the compressor is equivalent to the temperature, the operating state of the evaporator is determined, which is more intuitive and accurate. It can be understood that there is a corresponding relationship between pressure and medium saturation temperature. After the suction pressure of the compressor is obtained by the pressure sensor, the suction saturation temperature of the compressor can be determined by the corresponding relationship between pressure and medium saturation temperature.

[0093] Step 202: determining whether the suction saturation temperature is less than the first threshold value, if yes, executing step 203, if not, ending. When the suction saturation temperature is less than the first threshold value, it indicates that the operating temperature of the indoor evaporator is low, and in this case, the control parameters of the compressor should be adjusted to protect the evaporator at low temperature.

[0094] As shown in Figure 3 Step 203: every time a preset period is passed, the operating frequency of the compressor is reduced by a first percentage. The preset period can be set, and the compressor performs a frequency reduction operation every preset period. On the one hand, it can avoid sudden reduction of the frequency of the compressor, can give the compressor adjustment and reaction time, can guarantee the safe operation of the compressor, and can improve the service life of the compressor; on the other hand, the frequency of the compressor is controlled in the form of percentage, which can gradually reduce the frequency of the compressor, and will not excessively affect the refrigeration or heating effect of the air conditioner, avoid the indoor environment temperature fluctuation, and improve the user experience.

[0095] In some examples, the preset period can be 40s, and the first percentage can be 15%.

[0096] The control method provided by the embodiment of the application only needs to obtain the operating state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, which greatly improves the cost of air conditioner control and improves the compatibility of the air conditioner.

[0097] In some examples, the control method of the air conditioner provided by the embodiments of the present application comprises:

[0098] Step 301: detecting the suction pressure of the compressor and obtaining the suction saturation temperature based on the suction pressure of the compressor. A pressure sensor can be arranged at the suction port of the compressor, which can directly detect and obtain the suction pressure of the compressor, so that the acquisition of the suction pressure of the compressor is simple and direct, the accuracy of the original data can be guaranteed, and the controller of the air conditioner can be facilitated to collect and obtain. The suction saturation temperature of the compressor can be obtained based on the suction pressure of the compressor, and the suction saturation temperature can represent the temperature of the evaporator in the room. It can be understood that the lower the suction saturation temperature, the lower the temperature of the evaporator, and the higher the suction saturation temperature, the higher the temperature of the evaporator. After the suction pressure of the compressor is equivalent to the temperature, the operating state of the evaporator is determined, which is more intuitive and accurate. It can be understood that there is a corresponding relationship between the pressure and the saturation temperature of the medium. After the suction pressure of the compressor is obtained by the pressure sensor, the suction saturation temperature of the compressor can be determined based on the corresponding relationship between the pressure and the saturation temperature of the medium.

[0099] Step 302: determining whether the suction saturation temperature is less than a second threshold value, if yes, executing step 303, if not, ending. When the suction saturation temperature is less than the second threshold value, it indicates that the operating temperature of the evaporator in the room is very low, and the control parameters of the compressor should be adjusted in time to protect the evaporator from low temperature.

[0100] Step 303: detecting the continuous time length that the evaporator continuously operates in the second operating state.

[0101] Step 304: determining whether the continuous time length exceeds a first time length and the continuous running time length of the compressor exceeds a second time length, if yes, executing step 305, if not, resetting the determination, and then executing step 303. The operating time length of the compressor can be counted, and the time length of the evaporator in the second operating state can be counted. When the operating time length of the compressor exceeds the second time length and the time length of the evaporator in the second state exceeds the first time length, it is considered that the temperature of the evaporator is very low, and the compressor should be stopped and an evaporator low temperature fault warning should be generated in this case. Further, the control of the air conditioner can receive the evaporator low temperature fault and display the evaporator low temperature fault warning on the display screen of the air conditioner. Only when the operating time length of the compressor exceeds the second time length and the time length of the evaporator in the second state exceeds the first time length, the compressor is stopped, which can avoid misjudgment caused by low suction pressure of the compressor at the beginning of the air conditioner, and can improve the stability of the operation of the air conditioner.

[0102] Step 305: controlling the compressor to stop and generating an evaporator low temperature fault warning.

[0103] Step 306: Determine whether the compressor shutdown time exceeds the third duration. If yes, proceed to step 307; otherwise, proceed to step 305.

[0104] Step 307: Control the compressor to start and issue a fault clearing message. After the compressor has been off for more than three hours, it can be assumed that the indoor evaporator temperature has returned to normal. Therefore, the compressor can be restarted to perform cooling or heating operations, and a fault clearing message can be issued. The air conditioner's control system can receive the evaporator low temperature fault information and display the evaporator low temperature fault warning on the air conditioner's display screen.

[0105] The control method provided in this application embodiment can know the operating status of the indoor evaporator simply by the compressor suction pressure. It does not rely on the communication relationship between the evaporator and the compressor, nor on the communication relationship between the evaporator and the condenser. Even when the evaporator cannot communicate with the compressor, it can still protect the evaporator, which greatly improves the cost of air conditioner control and helps to improve the compatibility of the air conditioner.

[0106] like Figure 4 As shown, a control device for an air conditioner according to a second aspect of an embodiment of this application includes: a memory 401 storing a computer program; and a processor 402 executing the computer program; wherein, when executing the computer program, the processor 402 implements the control method of any of the above-mentioned technical solutions.

[0107] The control device for the air conditioner provided in this application takes into account that, in some cases, the indoor evaporator may not have a communication connection with the outdoor compressor and condenser. Based on this, the temperature of the evaporator detected by the temperature sensor installed at the indoor evaporator will not be transmitted to the compressor, the operating frequency of the compressor will not be able to adapt to the temperature of the evaporator, and the evaporator will not be able to be protected against low temperature.

[0108] On this basis, the control device of the air conditioner provided in the application first acquires the suction pressure of the compressor, then judges the working state of the evaporator based on the suction pressure of the compressor, and then adjusts the control parameter of the compressor based on the working state of the evaporator, so that the working parameter of the compressor can be adapted to the working state of the evaporator, and the evaporator can be protected, especially when the temperature of the evaporator is too low, the control parameter of the compressor can be actively adjusted to reduce the temperature of the evaporator, and the protection of the evaporator is realized. The control method provided in the embodiments of the application acquires the suction pressure of the compressor, and only needs to obtain the working state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, greatly improving the cost of air conditioner control and improving the compatibility of the air conditioner.

[0109] It can be understood that, in order to reduce the noise of the air conditioner in the prior art, the compressor is usually arranged outdoors, and when the signal transmitter of the evaporator is damaged, the evaporator can not be able to communicate with the compressor; when the evaporator is connected to the outdoor compressor through a wired manner, the damage or breakage of the cable can also cause the evaporator to be unable to communicate with the compressor; similarly, if the compressor and the evaporator come from different suppliers, that is, the compressor and the indoor evaporator belong to different brands, there is also a possibility that they cannot communicate with each other. Based on this, the application only needs to obtain the working state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, greatly improving the cost of air conditioner control and improving the compatibility of the air conditioner.

[0110] The control device provided in the application considers that the temperature change speed of the medium on the path between the evaporator and the suction port of the compressor is relatively fast, and in the case that the evaporator and the outdoor compressor do not have a communication connection relationship, the outdoor compressor cannot obtain the temperature of the outlet of the evaporator, and the pressure fluctuation of the medium between the evaporator and the suction port of the compressor is relatively small, so collecting the suction pressure of the compressor can be equivalent to the working temperature of the evaporator.

[0111] As shown in Figure 5 According to the third aspect of the embodiments of the application, a computer readable storage medium 501 is provided, and the computer readable storage medium 501 stores a computer program 502, and the control method of any of the above technical solutions is realized.

[0112] The computer readable storage medium provided by the embodiment of the present application considers that in some cases, the indoor evaporator can not be in communication connection with the outdoor compressor and condenser, and on this basis, the evaporator temperature detected by the temperature sensor arranged at the indoor evaporator cannot be transmitted to the compressor, and the operation frequency of the compressor cannot be adapted to the temperature of the evaporator, and the evaporator cannot be protected at low temperature.

[0113] On this basis, the computer readable storage medium provided by the present application first acquires the suction pressure of the compressor, then judges the operation state of the evaporator based on the suction pressure of the compressor, and adjusts the control parameter of the compressor based on the operation state of the evaporator, so that the working parameter of the compressor can be adapted to the operation state of the evaporator, and the evaporator can be protected, especially when the temperature of the evaporator is too low, the control parameter of the compressor can be actively adjusted to reduce the temperature of the evaporator, and the protection of the evaporator is realized. The control method provided by the embodiment of the present application acquires the suction pressure of the compressor, and only needs to acquire the operation state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, which greatly improves the cost of air conditioner control and is beneficial to improve the compatibility of the air conditioner.

[0114] It can be understood that in order to reduce the noise of the air conditioner in the prior art, the compressor is usually arranged outdoors, and when the signal transmitter of the evaporator is damaged, the evaporator can not be able to communicate with the compressor. When the evaporator is connected to the outdoor compressor through a wired manner, the damage or breakage of the cable can also cause the evaporator to be unable to communicate with the compressor. Similarly, if the compressor and the evaporator come from different suppliers, that is, the compressor and the indoor evaporator belong to different brands, there is also a possibility that they cannot communicate with each other. Based on this, the present application only needs to acquire the operation state of the indoor evaporator through the suction pressure of the compressor, without relying on the communication relationship between the evaporator and the compressor, and without relying on the communication relationship between the evaporator and the condenser. In the case that the evaporator cannot communicate with the compressor, the evaporator can still be protected, which greatly improves the cost of air conditioner control and is beneficial to improve the compatibility of the air conditioner.

[0115] The computer readable storage medium provided by the present application considers that the temperature of the medium changes relatively fast in the passage between the evaporator and the suction port of the compressor, and in the case that the evaporator and the outdoor compressor are not in communication connection, the outdoor compressor cannot acquire the temperature of the outlet of the evaporator, and the pressure fluctuation of the medium between the evaporator and the suction port of the compressor is relatively small, so collecting the suction pressure of the compressor can be equivalent to the operation temperature of the evaporator.

[0116] According to a fourth aspect of the embodiments of the present application, an air conditioner is provided, comprising the control device of the above technical solution.

[0117] The air conditioner provided by the present application comprises the control device of the above technical solution, so the controller provided by the present application has all the beneficial effects of the control device, which will not be described here.

[0118] In some examples, the air conditioner further comprises a compressor and a pressure sensor, the pressure sensor is arranged at a suction port of the compressor, and the control device obtains the suction pressure of the compressor through the pressure sensor.

[0119] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation of the present application.

[0120] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like indicate that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0121] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A control method for an air conditioner, characterized in that, include: Obtain the compressor suction pressure; The operating status of the evaporator is determined based on the compressor suction pressure; Adjust the control parameters of the compressor based on the operating status of the evaporator; The step of determining the operating status of the evaporator based on the compressor suction pressure includes: Based on the compressor suction pressure, the suction saturation temperature of the compressor is obtained; The operating state of the evaporator is determined based on the suction saturation temperature; the step of determining the operating state of the evaporator based on the compressor suction saturation temperature includes: When the intake saturation temperature is less than the first threshold and greater than or equal to the second threshold, the operating state is determined to be the first operating state. The step of adjusting the control parameters of the compressor based on the operating status of the evaporator includes: When the operating state is the first operating state, the operating frequency of the compressor is reduced; The step of reducing the operating frequency of the compressor includes: After each preset cycle, the operating frequency of the compressor is reduced by a first percentage.

2. The control method according to claim 1, characterized in that, The step of reducing the operating frequency of the compressor further includes: Obtain the operating mode of the air conditioner; When the air conditioner is in cooling mode and the compressor frequency is below the third threshold, the compressor frequency adjustment is stopped. When the air conditioner is in heating mode and the compressor frequency is below the fourth threshold, the compressor frequency adjustment is stopped. The value of the fourth threshold is greater than that of the third threshold.

3. The control method according to claim 1, characterized in that, The step of determining the operating status of the evaporator based on the compressor suction saturation temperature includes: When the intake saturation temperature is less than the second threshold, the operating state is determined to be the second operating state; The steps for adjusting the control parameters of the compressor based on the operating status of the evaporator include: When the operating state is the second operating state, the compressor is controlled to stop.

4. The control method according to claim 3, characterized in that, When the operating state is the second operating state, the step of controlling the compressor to stop includes: The duration for which the evaporator remains in the second operating state is detected. If the continuous duration exceeds the first duration and the continuous running duration of the compressor exceeds the second duration, the compressor is controlled to stop. The method further includes: When the compressor is shut down, an evaporator low-temperature fault alarm is generated.

5. The control method according to claim 4, characterized in that, The control method further includes: After the compressor has been shut down for more than three hours, the compressor is controlled to start and a fault clearing message is sent.

6. A control device for an air conditioner, characterized in that, include: Memory, which stores computer programs; The processor executes the computer program; Wherein, when the processor executes the computer program, it implements the control method as described in any one of claims 1 to 5.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that implements the control method as described in any one of claims 1 to 5.

8. An air conditioner, characterized in that, include: The control device as described in claim 6.

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