Control method, device and readable storage medium of air conditioner

Abstract

The present application relates to the technical field of anti-freezing control of air conditioners, and particularly relates to a control method, equipment and readable storage medium of an air conditioner, which can respectively perform anti-freezing treatment in the process of starting a compressor, in the process of starting refrigeration operation and in the process of refrigeration operation, and can improve the applicability of the anti-freezing treatment compared with the prior art. Moreover, whether the anti-freezing treatment is needed is judged according to the running time length of the compressor, the temperature of the indoor evaporator inlet and the suction temperature of the compressor, compared with a single judgment factor, whether the anti-freezing treatment is needed can be accurately judged, and the accuracy of the anti-freezing treatment can be improved. When the anti-freezing treatment is performed, the temperature of the indoor heat exchanger is improved by controlling multiple factors such as the compressor, the air deflector, the outdoor fan and the indoor fan, compared with a single control factor, the working efficiency of the anti-freezing treatment can be improved.

Description

Technical Field

[0001] This invention relates to the field of anti-freezing control technology for air conditioners, and in particular to a control method, device and readable storage medium for an air conditioner. Background Technology

[0002] An air conditioner is a common electrical device used to regulate indoor temperature, thereby improving indoor comfort or making the indoor environment suitable for storing specific items. The structure of an air conditioner includes an indoor evaporator, an outdoor heat exchanger, and a compressor. The working principle of refrigeration is as follows: the compressor compresses gaseous refrigerant into a high-temperature, high-pressure gaseous refrigerant, which then dissipates heat at the outdoor radiator, resulting in a liquid refrigerant at a preset state of normal temperature and high pressure. The liquid refrigerant then vaporizes and absorbs heat at the indoor evaporator, thus lowering the indoor temperature.

[0003] When the evaporation pressure of the indoor evaporator is too low, or the evaporation rate is too low, the evaporation temperature will be too low, causing icing. When the indoor evaporator freezes, it will affect the service life of the air conditioner, so antifreeze treatment is necessary.

[0004] The existing anti-freezing method involves detecting the temperature of the indoor evaporator coil when the air conditioner is in cooling mode, and initiating anti-freezing treatment when the temperature meets set conditions by reducing the compressor frequency. The drawbacks of this method are: it only performs anti-freezing treatment on the indoor heat exchanger when the air conditioner is in cooling mode, making it inapplicable when the air conditioner is in other cooling modes; the judgment condition is singular, relying solely on the temperature of one coil to determine if the indoor evaporator is freezing, but indoor evaporators typically have multiple coils, and the temperature of one coil only reflects the temperature of its corresponding circuit, not the temperature of the entire indoor evaporator. Therefore, relying on only one coil cannot accurately determine whether the entire indoor evaporator is freezing, leading to poor accuracy in anti-freezing treatment; and the control factor is singular, relying solely on controlling the compressor frequency to increase the indoor heat exchanger temperature to achieve anti-freezing, but this single control factor results in a slower temperature rise for the indoor heat exchanger, reducing efficiency during anti-freezing treatment.

[0005] In summary, existing methods for preventing freezing in air conditioners suffer from poor applicability, low accuracy, and low efficiency. Summary of the Invention

[0006] This invention provides a control method, device, and readable storage medium for an air conditioner, which addresses the problems of low precision, poor accuracy, and low efficiency in the anti-freezing process of existing air conditioners.

[0007] To at least solve the above problems, the present invention provides the following technical solutions:

[0008] A method for controlling an air conditioner includes one or more of the following: anti-freeze control for compressor startup, anti-freeze control for cooling operation activation, and anti-freeze control for cooling operation.

[0009] The anti-freeze control for compressor startup includes:

[0010] During the compressor start-up process, when the compressor's running time and the indoor evaporator inlet temperature meet the first preset conditions, the compressor, air guide plate, outdoor fan and indoor fan are controlled to work in the first preset state to perform anti-freezing treatment.

[0011] The anti-freeze control for the activation of the cooling operation includes:

[0012] During the cooling operation, when the compressor's running time and suction temperature meet the second preset conditions, the compressor, air guide plate, outdoor fan and indoor fan are controlled to work in the second preset state to perform anti-freezing treatment.

[0013] The anti-freeze control for the refrigeration operation includes:

[0014] During the refrigeration operation, when the temperature at the inlet of the indoor evaporator meets the third preset condition, the operating status of the compressor, air guide plate, outdoor fan and indoor fan are controlled according to the temperature at the inlet of the indoor evaporator in order to carry out anti-freezing treatment.

[0015] According to one embodiment of the present invention, the first preset condition includes: after the compressor runs for a first running time, the temperature at the inlet of the indoor evaporator is lower than the first preset temperature for a duration of a first preset duration.

[0016] The first preset state includes: the opening degree of the air guide plate is zero degrees, and the compressor, indoor fan and outdoor fan are stopped.

[0017] According to one embodiment of the present invention, the anti-freeze control for compressor startup further includes:

[0018] When the compressor's shutdown time reaches the first shutdown time and the temperature at the indoor evaporator inlet is greater than the preset inlet temperature, the antifreeze treatment is stopped.

[0019] According to one embodiment of the present invention, the second preset condition includes: after the compressor's running time reaches a second running time, the duration for which the compressor's suction temperature is lower than a second preset temperature reaches a second preset duration;

[0020] The second preset working state is as follows: the air guide plate is open at the preset opening, the compressor and outdoor fan are stopped, and the indoor fan speed is not greater than the first preset speed.

[0021] According to one embodiment of the present invention, the anti-freeze control for activating the refrigeration operation further includes:

[0022] When the compressor's shutdown time reaches the second shutdown time and the compressor's suction temperature is greater than the preset suction temperature, the antifreeze treatment is stopped.

[0023] According to one embodiment of the present invention, the third preset condition is: the temperature at the evaporator inlet is less than the first temperature threshold.

[0024] The step of controlling the operating status of the compressor, air guide plate, outdoor fan, and indoor fan based on the temperature at the inlet of the indoor evaporator includes:

[0025] Based on the relationship between the temperature at the indoor evaporator inlet and the second and third temperature thresholds, control strategies for the compressor, air guide plate, outdoor fan, and indoor fan are obtained.

[0026] The control strategy described above is used to control the opening degree of the air guide plate, the frequency of the compressor, the speed of the indoor fan, and the speed of the outdoor fan.

[0027] According to one embodiment of the present invention, the step of obtaining a control strategy for the compressor, air guide plate, outdoor fan, and indoor fan based on the relationship between the temperature at the indoor evaporator inlet and a second temperature threshold and a third temperature threshold includes:

[0028] When the temperature at the inlet of the indoor evaporator is less than the third preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the first degree, the compressor operates at a higher frequency, and the speeds of both the indoor fan and the outdoor fan are greater than the first speed threshold.

[0029] When the temperature at the inlet of the indoor evaporator is greater than the third preset temperature and less than the second preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the second degree, the compressor frequency remains unchanged, and the speed of both the indoor fan and the outdoor fan is greater than the second speed threshold and less than the first speed threshold.

[0030] When the temperature at the inlet of the indoor evaporator is greater than the second preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the third degree, the compressor frequency is kept at a reduced frequency, and the speed of both the indoor fan and the outdoor fan is less than the second speed threshold.

[0031] According to one embodiment of the present invention, the anti-freeze control of the refrigeration operation further includes: stopping the anti-freeze process when the temperature at the inlet of the indoor evaporator is greater than a first temperature threshold.

[0032] A control device for an air conditioner includes a processor and a memory, wherein the memory stores a computer program for execution on the processor, and when the processor executes the computer program, it implements the control method for the air conditioner as described in any of the above embodiments.

[0033] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the control method for an air conditioner as described in any of the above embodiments.

[0034] The technical solution provided by this invention includes anti-freeze control for compressor startup, anti-freeze control for refrigeration operation startup, and anti-freeze control for refrigeration operation. Anti-freeze treatment can be performed during compressor startup, refrigeration operation startup, and refrigeration operation, respectively, improving the applicability of anti-freeze treatment compared to existing technologies. Furthermore, the need for anti-freeze treatment is determined based on the compressor's operating time, the indoor evaporator inlet temperature, and the compressor's suction temperature. Compared to relying on a single factor, this allows for more accurate determination of whether anti-freeze treatment is needed, improving the accuracy of the anti-freeze treatment. During anti-freeze treatment, the temperature of the indoor heat exchanger is increased by controlling multiple factors, including the compressor, air guide plate, outdoor fan, and indoor fan. Compared to controlling a single factor, this improves the efficiency of the anti-freeze treatment. In summary, the technical solution of this invention improves the applicability, accuracy, and efficiency of anti-freeze treatment.

[0035] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0036] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0037] Figure 1 This is a flowchart of an air conditioner control method according to an embodiment of the present invention;

[0038] Figure 2 This is a flowchart illustrating antifreeze treatment during the cooling operation phase according to an embodiment of the present invention;

[0039] Figure 3This is a schematic diagram of a control strategy based on the temperature at the inlet of an indoor evaporator according to an embodiment of the present invention. Detailed Implementation

[0040] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Figures 1-3 This is a complete or partial flowchart of a control method for an air conditioner according to this application. The control method can determine whether anti-freezing treatment needs to be activated during the compressor startup process, the cooling operation start-up process, and the cooling operation process by using the temperature at the indoor evaporator inlet, the compressor suction temperature, and the compressor running time. When anti-freezing treatment of the indoor evaporator needs to be activated, the method performs anti-freezing treatment on the indoor evaporator by controlling the opening degree of the air guide plate (i.e., the opening angle of the air guide plate), the compressor frequency, and the speed of the indoor fan and the outdoor fan.

[0042] In the technical solution of this application, it is necessary to obtain the temperature of the indoor evaporator inlet, the suction temperature of the compressor, and the compressor running time. Therefore, a first temperature sensor needs to be installed at the inlet of the indoor evaporator to detect the temperature of the indoor evaporator inlet, and a second temperature sensor needs to be installed at the inlet of the compressor to detect the temperature of the indoor evaporator inlet. A timing chip is also installed to obtain the compressor running time. Then, a connection is established between the air conditioner and the signal output terminals of the first and second temperature sensors, as well as between the air conditioner and the control terminal and signal output terminal of the timing chip. When it is necessary to obtain the temperature of the indoor evaporator inlet, the detection data of the first temperature sensor is received. When it is necessary to obtain the suction temperature of the compressor, the detection data of the second temperature sensor is received. When it is necessary to obtain duration information, such as the compressor running time, a signal can be sent to the control terminal of the timing chip at the moment the compressor starts to make the timing chip start timing, and the data output by the signal output terminal of the timing chip is obtained in real time to obtain the timing result, which is the compressor running time.

[0043] Figure 1 The diagram shown is a flowchart of a control method for an air conditioner. The following section will discuss this method in conjunction with... Figure 1 The technical solution of this application is described in detail.

[0044] like Figure 1 As shown, the air conditioner control method of the present invention includes one or more of the following: compressor start-up anti-freeze control, cooling operation start-up anti-freeze control, and cooling operation anti-freeze control. The compressor start-up anti-freeze control is used to prevent freezing of the indoor evaporator during compressor start-up; the cooling operation start-up anti-freeze control is used to prevent freezing of the indoor evaporator during cooling operation start-up; and the cooling operation anti-freeze control is used to prevent freezing of the indoor evaporator during cooling operation. The compressor start-up anti-freeze control, the cooling operation start-up anti-freeze control, and the cooling operation anti-freeze control will be described in detail below.

[0045] The anti-freeze control for the compressor startup mentioned above includes:

[0046] Step S11: During the compressor start-up process, obtain the compressor running time and the evaporator inlet temperature;

[0047] Step S12: Determine whether the compressor's running time and the evaporator inlet temperature meet the first preset condition. If they do, control the compressor, air guide plate, outdoor fan, and indoor fan to operate in the first preset state to perform anti-freezing treatment.

[0048] The anti-freeze control activated during the above-mentioned cooling operation includes:

[0049] Step S21: During the start-up of the refrigeration operation, obtain the compressor's running time and the compressor's suction temperature;

[0050] Step S22: Determine whether the compressor's running time and suction temperature meet the second preset conditions. If they do, control the compressor, air guide plate, outdoor fan, and indoor fan to operate in the second preset state to perform anti-freezing treatment.

[0051] The anti-freeze control for the above-mentioned refrigeration operation includes:

[0052] Step S31: During the refrigeration operation, obtain the temperature of the indoor evaporator inlet;

[0053] Step S32: Determine whether the temperature at the inlet of the indoor evaporator meets the third preset condition. If it does, control the working status of the compressor, air guide plate, outdoor fan and indoor fan according to the temperature at the inlet of the indoor evaporator to carry out anti-freezing treatment.

[0054] As can be seen from the above, the air conditioner control method provided by the present invention can perform antifreeze treatment on the indoor heat exchanger during the compressor startup process, the cooling operation start-up process, and the cooling operation process. Compared with the prior art, which only performs antifreeze treatment during the cooling operation process, it has the advantage of strong adaptability.

[0055] In this embodiment, the temperature at the inlet of the indoor evaporator represents the temperature of the refrigerant entering the indoor evaporator. The higher the temperature of the refrigerant entering the indoor evaporator, the lower the likelihood of the indoor evaporator freezing. The suction temperature of the compressor reflects whether the refrigerant entering the indoor evaporator has completely evaporated during refrigeration evaporation. The lower the suction temperature of the compressor, the lower the temperature at the outlet of the indoor evaporator, and the higher the likelihood of the indoor evaporator freezing. The operating time of the compressor reflects the flow rate of the refrigerant entering the indoor evaporator, ensuring timely freezing treatment in case of freezing.

[0056] Therefore, using the compressor's operating time and the temperature of the refrigerant entering the indoor evaporator as the conditions for initiating antifreeze treatment during compressor startup, the compressor's operating time and suction temperature as the conditions for initiating antifreeze treatment during cooling operation, and the temperature of the indoor evaporator inlet as the conditions for initiating antifreeze treatment during cooling operation can improve the accuracy and timeliness of antifreeze treatment initiation at each stage of the air conditioner.

[0057] Since the compressor frequency affects the temperature of the refrigerant entering the indoor evaporator, the indoor fan speed affects the heat exchange efficiency of the indoor evaporator, thus affecting the temperature of the indoor evaporator, the outdoor heat exchanger speed affects the heat exchange efficiency of the outdoor unit, thus affecting the temperature of the refrigerant entering the indoor evaporator, and the opening of the air guide plate affects the heat dissipation of the indoor evaporator, the compressor frequency, indoor fan speed, outdoor fan speed, and indoor fan speed all affect the temperature of the indoor evaporator. Therefore, in this embodiment, by controlling the compressor, air guide plate, outdoor fan, and indoor fan for anti-freezing treatment, the effect of anti-freezing treatment can be improved.

[0058] In one embodiment, the first preset condition includes: after the compressor has been running for a first operating time, the temperature at the inlet of the indoor evaporator is lower than the first preset temperature for a first preset duration; the first preset state includes: the opening degree of the air guide plate is zero degrees, and the compressor, indoor fan and outdoor fan are stopped.

[0059] In this embodiment, the first running time can be 6 minutes, the first preset temperature can be 0°C, and the first preset duration can be 10 seconds. That is, after the compressor runs for 6 minutes, the temperature of the indoor evaporator inlet is acquired. If the temperature of the indoor evaporator inlet is below 0°C for 10 seconds, the indoor evaporator is considered to be frozen. During the compressor startup process, based on the compressor's operating time and the temperature of the indoor evaporator inlet, it can be accurately determined whether the indoor evaporator needs anti-freezing treatment. When performing anti-freezing treatment, the opening degree of the air guide plate is set to zero degrees and the indoor fan is stopped to reduce the heat dissipation of the indoor evaporator. The outdoor fan and compressor are stopped to prevent low-temperature refrigerant from entering the indoor evaporator, thereby achieving anti-freezing treatment of the indoor evaporator.

[0060] In one embodiment, the anti-freeze control for compressor startup further includes stopping the anti-freeze process when the compressor's shutdown duration reaches a first shutdown duration and the temperature at the indoor evaporator inlet is greater than a preset inlet temperature.

[0061] In this embodiment, the first shutdown duration can be set to 3 minutes, and the preset inlet temperature can be set to 9°C. That is, during the compressor startup process, if the compressor shutdown duration reaches 3 minutes and the indoor evaporator inlet temperature is greater than 9°C, the anti-freeze treatment will stop. This embodiment uses the compressor shutdown duration and the indoor evaporator inlet temperature as the criteria for stopping the anti-freeze treatment, ensuring sufficient anti-freeze protection for the indoor heat exchanger and preventing incomplete anti-freeze treatment.

[0062] In one embodiment, the second preset condition includes: after the compressor's running time reaches the second running time, the duration for which the compressor's suction temperature is lower than the second preset temperature reaches the second preset duration; the second preset working state is: the air guide plate is at a preset opening, the compressor and outdoor fan are stopped, and the indoor fan's speed is not greater than the first preset speed.

[0063] In this embodiment, the second running time can be set to 6 minutes, the second preset temperature can be set to -6℃, the second preset duration can be 10 minutes, the preset opening degree is 10 degrees, and the first preset speed can be set according to requirements. Furthermore, when the indoor fan speed is less than the first preset speed, it can be considered that the indoor fan is running at low speed. That is, through the settings of this embodiment, after the air conditioner has been running in cooling mode for 6 minutes, the compressor's suction temperature is obtained. When the compressor's suction temperature remains below -6℃ for 10 minutes, the air guide plate opening degree is controlled to 10 degrees, the indoor fan runs at low speed, and the compressor and outdoor fan are stopped to increase the temperature of the indoor evaporator and achieve anti-freezing treatment of the indoor evaporator.

[0064] In this embodiment, during the refrigeration operation, the compressor's running time and suction temperature can be used to accurately determine whether the indoor heat exchanger needs antifreeze treatment. When antifreeze treatment is performed, the opening degree of the baffle is controlled to a preset opening degree and the speed of the indoor fan is controlled to be no greater than a first preset speed to reduce heat dissipation from the indoor heat exchanger. The compressor and outdoor fan are stopped to reduce the entry of low-temperature refrigerant into the indoor heat exchanger, thereby achieving antifreeze treatment of the indoor heat exchanger.

[0065] In one embodiment, the anti-freeze control during the start of refrigeration operation further includes: during the anti-freeze process of starting refrigeration operation, obtaining the compressor's shutdown duration and the compressor's suction temperature; when the compressor's shutdown duration reaches a second shutdown duration and the compressor's suction temperature is greater than a preset suction temperature, stopping the anti-freeze process.

[0066] In this embodiment, the second shutdown duration can be set to 10 minutes, and the preset suction temperature can be set to 5°C. That is, during the anti-freeze process while the refrigeration unit is running, if the compressor's shutdown duration reaches 10 minutes and the compressor's suction temperature is greater than 5°C, the anti-freeze process will stop. This configuration ensures adequate anti-freeze protection for the indoor heat exchanger, preventing incomplete anti-freeze treatment.

[0067] In one embodiment, the third preset condition is: the temperature at the indoor evaporator inlet is less than the first temperature threshold; the process of controlling the operating status of the compressor, air guide plate, outdoor fan, and indoor fan based on the temperature at the indoor evaporator inlet is as follows: Figure 2 As shown, it includes:

[0068] Step S301: Obtain the relationship between the indoor evaporator inlet temperature and the second and third temperature thresholds;

[0069] Step S302: Based on the above size relationship, obtain the control strategies for the compressor, air guide plate, outdoor fan and indoor fan;

[0070] Step S303: Use the acquired control strategy to control the opening degree of the air guide plate, the frequency of the compressor, the speed of the indoor fan and the speed of the outdoor fan.

[0071] In this embodiment, the first temperature threshold is greater than the second temperature threshold, and the second temperature threshold is greater than the third temperature threshold. For example, the first temperature threshold can be set to 9°C, the second temperature threshold can be set to 7°C, and the third temperature threshold can be set to 5°C.

[0072] Based on the third preset condition mentioned above, it can be concluded that during the cooling operation of the air conditioner, when the temperature at the inlet of the indoor evaporator is lower than the first temperature threshold, the indoor evaporator is considered to be frozen and anti-freezing treatment is required; otherwise, the indoor evaporator is considered not to be frozen and anti-freezing treatment is not required.

[0073] When antifreeze treatment is required, the control strategies for the compressor, air guide plate, outdoor fan, and indoor fan can be obtained based on the relationship between the temperature at the indoor evaporator inlet and the second and third temperature thresholds. Specifically, when the temperature at the indoor heat exchanger inlet is less than 5℃, greater than or equal to 5℃ but less than 7℃, and greater than or equal to 7℃ but less than 9℃, different control strategies are used to control the opening degree of the air guide plate, the frequency of the compressor, the speed of the indoor fan, and the speed of the outdoor fan, so as to achieve precise control of the antifreeze treatment of the indoor heat exchanger.

[0074] In this embodiment, the temperature of the refrigerant entering the indoor evaporator can be obtained from the temperature at the indoor evaporator inlet. Since the refrigerant temperature is a crucial factor causing the indoor evaporator to freeze, the system can accurately determine whether anti-freezing measures are needed during the air conditioner's cooling operation based on the indoor evaporator inlet temperature. Furthermore, during anti-freezing measures, different control strategies are employed for the compressor, air guide vane, outdoor fan, and indoor fan based on the relationship between the indoor evaporator inlet temperature and the second and third temperature thresholds. This ensures anti-freezing measures are implemented for the indoor heat exchanger under various operating conditions, preventing insufficient anti-freezing protection.

[0075] In one embodiment, the control strategy for the compressor, air guide plate, outdoor fan, and indoor fan is obtained based on the relationship between the temperature at the indoor evaporator inlet and the second and third temperature thresholds. Figure 3 As shown, it includes:

[0076] When the temperature at the indoor evaporator inlet is lower than the third preset temperature, the control strategy is as follows: the air guide vane opening is set to the first degree, the compressor operates at increased frequency, and the speeds of both the indoor and outdoor fans exceed the first speed threshold. In this embodiment, the compressor frequency increase refers to the compressor increasing its frequency according to a set step size, for example, increasing the frequency in steps of 1Hz / 10s; the first opening can be 30 degrees, the first speed threshold can be set according to requirements, and when the speeds of the indoor and outdoor fans exceed the first speed threshold, it can be considered that the indoor and outdoor fans are operating at high speed.

[0077] When the temperature at the indoor evaporator inlet is greater than the third preset temperature but less than the second preset temperature, the control strategy is as follows: the air guide vane opening is the second degree, the compressor frequency remains unchanged, and the speeds of both the indoor and outdoor fans are greater than the second speed threshold and less than the first speed threshold. In this embodiment, the second opening can be 20 degrees, and the first speed threshold can be set according to requirements. When the speeds of the indoor and outdoor fans are greater than the second speed threshold and less than the first speed threshold, it can be considered that the indoor and outdoor fans are operating at medium speed.

[0078] When the temperature at the indoor evaporator inlet exceeds the second preset temperature, the control strategy is as follows: the air guide vane is opened to the third degree, the compressor frequency is reduced, and the speeds of both the indoor and outdoor fans are less than the second speed threshold. In this embodiment, the third degree can be 10 degrees, and the compressor frequency reduction operation means that the compressor reduces its frequency according to a set step size.

[0079] In one embodiment, the anti-freeze control during refrigeration operation further includes: acquiring the temperature of the indoor evaporator inlet during the anti-freeze process, and stopping the anti-freeze process when the temperature of the indoor evaporator inlet exceeds a first temperature threshold. Since it can be assumed that the refrigerant entering the indoor heat exchanger will not freeze when the temperature of the indoor evaporator inlet exceeds the first temperature threshold, stopping the anti-freeze process when the temperature of the indoor evaporator inlet exceeds the first temperature threshold in this embodiment not only prevents the anti-freeze process from being too short and resulting in an unsatisfactory effect, but also prevents the anti-freeze process from being too long and affecting the cooling function of the air conditioner.

[0080] This invention also provides a control device for an air conditioner, which includes a processor, a memory, a communication interface, and a communication bus. The processor, memory, and communication interface communicate with each other via the communication bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer program instructions. The internal memory provides an environment for the operation of the operating system and computer program instructions in the non-volatile storage medium. The communication interface of the above device is used for wired or wireless communication with an external terminal. Wireless communication can be achieved through WIFI, carrier networks, NFC (Near Field Communication), or other technologies. The control device for an air conditioner provided in this embodiment has a memory used to store computer program instructions. When these computer program instructions are executed by the processor, they can implement multiple embodiments of the above-described control method for the air conditioner.

[0081] This invention also provides a computer-readable storage medium. Those skilled in the art will understand that all or part of the processes in the above-described air conditioner control method embodiments can be implemented by computer program instructions to instruct related hardware. These computer program instructions can be stored in a non-volatile computer-readable storage medium. When executed, these computer program instructions can include the processes described in the above-described method embodiments. Any references to memory, storage, databases, or other media used in the embodiments provided by this invention can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0082] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control method for an air conditioner, characterized in that, include: One or more of the following: anti-freeze control for compressor startup, anti-freeze control for refrigeration operation startup, and anti-freeze control for refrigeration operation; The anti-freeze control for compressor startup includes: During the compressor start-up process, when the compressor's running time and the temperature at the indoor evaporator inlet meet the first preset conditions, the compressor, air guide plate, outdoor fan, and indoor fan are controlled to operate in the first preset state to perform anti-freezing treatment. The anti-freeze control for the activation of the cooling operation includes: During the cooling operation, when the compressor's running time and suction temperature meet the second preset conditions, the compressor, air guide plate, outdoor fan and indoor fan are controlled to work in the second preset state to perform anti-freezing treatment. The anti-freeze control for the refrigeration operation includes: During the refrigeration operation, when the temperature at the inlet of the indoor evaporator meets the third preset condition, the working status of the compressor, air guide plate, outdoor fan and indoor fan are controlled according to the temperature at the inlet of the indoor evaporator in order to carry out anti-freezing treatment. The first preset condition includes: after the compressor's running time reaches a first running time, the duration for which the temperature at the inlet of the indoor evaporator is lower than a first preset temperature reaches a first preset duration; The first preset state includes: the opening degree of the air guide plate is zero degrees, and the compressor, indoor fan and outdoor fan are stopped; The second preset condition includes: after the compressor's operating time reaches the second operating time, the duration for which the compressor's suction temperature is lower than the second preset temperature reaches the second preset duration. The second preset state is: the air guide plate is open at the preset opening, the compressor and outdoor fan are stopped, and the indoor fan speed is not greater than the first preset speed; The third preset condition is: the temperature at the evaporator inlet is less than the first temperature threshold. The step of controlling the operating status of the compressor, air guide plate, outdoor fan, and indoor fan based on the temperature at the inlet of the indoor evaporator includes: Based on the relationship between the temperature at the indoor evaporator inlet and the second and third temperature thresholds, control strategies for the compressor, air guide plate, outdoor fan, and indoor fan are obtained. The control strategy described above is used to control the opening degree of the air guide plate, the frequency of the compressor, the speed of the indoor fan, and the speed of the outdoor fan.

2. The control method for an air conditioner according to claim 1, characterized in that, The anti-freeze control for compressor startup also includes: When the compressor's shutdown time reaches the first shutdown time and the temperature at the indoor evaporator inlet is greater than the preset inlet temperature, the antifreeze treatment is stopped.

3. The control method for an air conditioner according to claim 1, characterized in that, The anti-freeze control for the refrigeration operation also includes: When the compressor's shutdown duration reaches the second shutdown duration and the compressor's suction temperature is greater than the preset suction temperature, the antifreeze treatment is stopped.

4. The control method for an air conditioner according to claim 1, characterized in that, The control strategy for the compressor, air guide plate, outdoor fan, and indoor fan is derived based on the relationship between the temperature at the indoor evaporator inlet and the second and third temperature thresholds, including: When the temperature at the inlet of the indoor evaporator is less than the third preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the first degree, the compressor operates at a higher frequency, and the speeds of both the indoor fan and the outdoor fan are greater than the first speed threshold. When the temperature at the inlet of the indoor evaporator is greater than the third preset temperature and less than the second preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the second degree, the compressor frequency remains unchanged, and the speed of both the indoor fan and the outdoor fan is greater than the second speed threshold and less than the first speed threshold. When the temperature at the inlet of the indoor evaporator is greater than the second preset temperature, the control strategy is as follows: the opening degree of the air guide plate is the third degree, the compressor frequency is kept at a reduced frequency, and the speed of both the indoor fan and the outdoor fan is less than the second speed threshold.

5. The control method for an air conditioner according to claim 4, characterized in that, The anti-freeze control for the refrigeration operation also includes stopping the anti-freeze process when the temperature at the inlet of the indoor evaporator is greater than a first temperature threshold.

6. A control device for an air conditioner, characterized in that, The device includes a processor and a memory, wherein the memory stores a computer program for execution on the processor, and when the processor executes the computer program, it implements the control method for an air conditioner as described in any one of claims 1-5.

7. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the control method for the air conditioner as described in any one of claims 1-6.

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