Air conditioner evaporator control method and device, air conditioner and computer readable medium

Abstract

The invention relates to an air conditioner evaporator control method and device, an air conditioner and a computer readable medium. The method comprises the steps that in a target operation mode, the temperature difference value is determined according to the inner pipe temperature of an evaporator pipe temperature bulb branch and the anti-freezing temperature, and the refrigerant bias flow grade of an evaporator is determined based on the temperature difference value; the opening degree of an electronic expansion valve is adjusted according to the refrigerant bias flow grade of the evaporator, and when the refrigerant bias flow grade of the evaporator reaches the highest bias flow grade, the operation duration of a compressor is obtained; and if the operation duration of the compressor under the highest bias current grade reaches a preset duration threshold value, the air conditioner is converted into a heating mode, an air guide plate of the air conditioner is controlled to be closed, and an inner fan is controlled to rotate reversely at the lowest rotating speed. The problems of refrigerant bias flow and frost formation of the evaporator are solved, meanwhile, the material cost is controlled, and the comfort of a user is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of air conditioning control technology, and in particular to an air conditioning evaporator control method, device, air conditioner and computer readable medium. Background Art

[0002] In the design and operation of air-conditioning systems, the evaporator is a key component in the refrigeration cycle, and its performance directly affects the overall efficiency and stability of the air conditioner. In traditional solutions, the evaporator of the indoor unit of the air conditioner is usually equipped with only one temperature sensor for monitoring the evaporation temperature. In actual use environments, due to the influence of various factors, such as the indoor evaporator being dirty and blocked, the air inlet being blocked, and the refrigeration or dehumidification operation in a low-temperature environment, the system may cause flow deviation. In the case of flow deviation, the refrigerant flow of each branch is unevenly distributed. The branch with significantly reduced refrigerant may experience severe overheating and increased evaporation temperature. The evaporator temperature of the branch with too much refrigerant will be low. Uneven distribution of refrigerant flow not only leads to a decrease in heat exchange efficiency, but also may cause the problem of frosting on the evaporator.

[0003] The prior art detects parameters such as the indoor ambient temperature, the inner coil temperature (evaporator temperature) and the temperature drop rate. When the temperature difference between the coil temperature and the indoor ambient temperature is less than the set value, the air conditioner is controlled to enter the anti-freeze protection. However, the above scheme does not fully consider the deviation conditions in actual use, such as foreign objects blocking the air inlet or a slight blockage in the branch. At this time, even if the indoor ambient temperature is normal, the set temperature difference value may be too large due to the deviation and the protection cannot be triggered; even if the anti-freeze protection is entered, the hot air blowing in the heating mode will affect the user comfort. In addition, it is also proposed to trigger the anti-freeze protection when the inner coil temperature is lower than the set value. There is also the problem of hot air blowing, which will cause the room temperature to rise rapidly and affect the user comfort. In addition, it is also proposed to defrost by adding bypass pipes, solenoid valves and other components, but this will increase costs.

[0004] It can be seen that the existing technology has not yet proposed an effective solution on how to effectively control the refrigerant deviation in each branch of the evaporator and the resulting frosting problem while ensuring user comfort and controlling air conditioning costs. Summary of the invention

[0005] The present application provides an air conditioner evaporator control method, device, air conditioner and computer-readable medium to solve the technical problems of the above-mentioned prior art in the control method of refrigerant deviation in the air conditioner evaporator and the frosting caused by it, high air conditioning cost due to the increase of auxiliary materials, and poor user comfort due to the obvious perception of temperature increase control.

[0006] According to one aspect of an embodiment of the present application, the present application provides an air conditioning evaporator control method, the method comprising: in a target operating mode, determining a temperature difference based on the inner tube temperature of the evaporator tube temperature bag branch and the anti-freeze entry temperature, and determining the refrigerant bias level of the evaporator based on the temperature difference; adjusting the opening of the electronic expansion valve according to the refrigerant bias level of the evaporator, and obtaining the operating time of the compressor when the refrigerant bias level of the evaporator reaches the highest bias level; if the operating time of the compressor reaches a preset time threshold at the highest bias level, switching the air conditioner to heating mode, and controlling the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed.

[0007] Optionally, in the target operating mode, the temperature difference is determined according to the inner tube temperature of the evaporator tube temperature bag branch and the entry anti-freeze temperature, and the refrigerant bias level of the evaporator is determined based on the temperature difference, including: obtaining the operating mode of the air conditioner, and judging whether the operating mode is the target operating mode, the target operating mode includes a cooling mode and a dehumidification mode; if the operating mode is the cooling mode or the dehumidification mode, obtaining the inner tube temperature of the evaporator tube temperature bag branch; calculating the temperature difference between the inner tube temperature and the entry anti-freeze temperature; determining the temperature difference condition satisfied by the temperature difference, and determining the refrigerant bias level of the evaporator according to the corresponding temperature difference condition.

[0008] Optionally, the refrigerant bias level includes primary bias, secondary bias and tertiary bias with increasing bias degrees, and determining the temperature difference condition satisfied by the temperature difference, and determining the refrigerant bias level of the evaporator according to the corresponding temperature difference condition, includes: comparing the temperature difference with each preset temperature difference range, and judging the preset temperature difference range satisfied by the temperature difference; if the temperature difference satisfies the first preset temperature difference range, judging that the refrigerant bias level is the primary bias; if the temperature difference satisfies the second preset temperature difference range, judging that the refrigerant bias level is the secondary bias; if the temperature difference satisfies the third preset temperature difference range, judging that the refrigerant bias level is the tertiary bias.

[0009] Optionally, the opening of the electronic expansion valve is adjusted according to the refrigerant bias level of the evaporator, and when the refrigerant bias level of the evaporator reaches the highest bias level, the operating time of the compressor is obtained, including: if the refrigerant bias level of the evaporator is the first-level bias, the operation is maintained with the current opening of the electronic expansion valve; if the refrigerant bias level of the evaporator is the second-level bias, the opening of the electronic expansion valve is controlled to increase with the first opening adjustment parameter; if the refrigerant bias level of the evaporator is the third-level bias, the opening of the electronic expansion valve is controlled to increase with the second opening adjustment parameter, and the operating time of the compressor is obtained, wherein the second opening adjustment parameter is greater than the first opening adjustment parameter.

[0010] Optionally, after adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, the method further includes: comparing the inner tube temperature of the evaporator tube temperature bag branch with the entry anti-freeze temperature and the exit anti-freeze temperature; if the inner tube temperature is lower than the entry anti-freeze temperature, it is determined that the air conditioner enters anti-freeze protection, and the outdoor unit of the air conditioner is controlled to shut down; when entering the anti-freeze protection, when it is detected that the inner tube temperature is higher than the exit anti-freeze temperature, the anti-freeze protection is exited, and the outdoor unit of the air conditioner is controlled to start.

[0011] Optionally, the operating time includes continuous operating time and cumulative operating time. If the operating time of the compressor reaches a preset time threshold at the highest bias flow level, the air conditioner is switched to heating mode, and the air guide plate of the air conditioner is controlled to be closed and the indoor fan is reversed at the lowest speed, including: judging whether the continuous operating time of the compressor reaches a first preset time threshold, and judging whether the cumulative operating time of the compressor reaches a second preset time threshold, and the second preset time threshold is greater than the first preset time threshold; if the continuous operating time of the compressor reaches the first preset time threshold, or the cumulative operating time of the compressor reaches the second preset time threshold, the operating mode of the air conditioner is switched to the heating mode, and the air guide plate of the air conditioner is controlled to be closed and the indoor fan is reversed at the lowest speed.

[0012] Optionally, after converting the operating mode of the air conditioner to the heating mode, and controlling the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed, the method also includes: obtaining the inner tube temperature of the evaporator tube temperature bag branch in the heating mode, and judging whether the inner tube temperature exceeds the high temperature protection threshold value; if the inner tube temperature exceeds the high temperature protection threshold value, then after running in the heating mode for a first high temperature setting time, converting to the operating mode before starting the heating mode; if the inner tube temperature does not exceed the high temperature protection threshold value, then after running in the heating mode for a second high temperature setting time, converting to the operating mode before starting the heating mode, and the second high temperature setting time is greater than the first high temperature setting time; obtaining the number of operations switched to the heating mode in a preset unit time, and if the number of operations switched to the heating mode reaches the heating number threshold, issuing an early warning prompt.

[0013] According to another aspect of the embodiment of the present application, the present application provides an air-conditioning evaporator control device, the device comprising: a data acquisition module, for determining a temperature difference according to the inner tube temperature of the evaporator tube temperature bag branch and the entry anti-freeze temperature under a target operating mode, and determining the refrigerant bias level of the evaporator based on the temperature difference; an opening adjustment module, for adjusting the opening of the electronic expansion valve according to the refrigerant bias level of the evaporator, and obtaining the operating time of the compressor when the refrigerant bias level of the evaporator reaches a maximum bias level; an operation control module, for switching the air conditioner to heating mode if the operating time of the compressor reaches a preset time threshold at the highest bias level, and controlling the air guide plate of the air conditioner to close and the internal fan to reverse at a minimum speed.

[0014] According to another aspect of an embodiment of the present application, the present application provides an air conditioner, including a memory, a processor, a communication interface and a communication bus, wherein the memory stores a computer program that can be run on the processor, the memory and the processor communicate through the communication bus and the communication interface, and the processor implements the steps of the air conditioner evaporator control method when executing the computer program.

[0015] According to another aspect of the embodiment of the present application, the present application provides a computer-readable medium having a non-volatile program code executable by a processor, wherein the program code enables the processor to execute the steps of the air conditioner evaporator control method.

[0016] The above technical solution provided by the embodiment of the present application has the following advantages compared with the related art:

[0017] The present application provides an air conditioner evaporator control method, which is conducive to more accurately controlling the refrigerant flow entering the evaporator, improving the heat exchange rate and accurately controlling the air conditioner to enter the anti-freeze protection by determining the refrigerant bias flow level corresponding to the evaporator according to the temperature difference in the target operation mode, and adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level. The increased refrigerant enters the bias flow branch, so that the overheating temperature of the bias flow branch decreases, and finally the flow difference of each branch of the evaporator becomes smaller, and the temperature difference becomes smaller accordingly, thereby solving or alleviating the bias flow problem of the evaporator, ensuring that each branch of the evaporator is not frosted or thinly frosted. Secondly, when the highest bias flow level is reached and the operation time of the compressor reaches the preset time threshold, the air conditioner is switched to the heating mode to defrost, the air guide plate of the air conditioner is controlled to be closed, the hot air will not be blown out from the air outlet, the user will not feel the hot air blowing out, and the internal fan is reversed at the lowest speed, the hot air blown out is small and the hot air will be blown to the evaporator, so that the ice on the evaporator melts quickly, which is more conducive to shortening the heating defrosting time and has less impact on the user's comfort. Furthermore, the entire process is achieved through logical control, without the need to add additional materials, which can control costs and is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technology descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without paying creative labor.

[0019] Figure 1 A schematic diagram of a hardware environment of an optional air-conditioning evaporator control method provided according to an embodiment of the present application;

[0020] Figure 2 A schematic flow chart of an optional air-conditioning evaporator control method provided according to an embodiment of the present application;

[0021] Figure 3 It is an overall control logic diagram of another optional air-conditioning evaporator control method provided according to an embodiment of the present application;

[0022] Figure 4 An optional air conditioning system cooling mode control logic operation diagram provided according to an embodiment of the present application;

[0023] Figure 5 A structural diagram of an optional air-conditioning evaporator control device provided according to an embodiment of the present application;

[0024] Figure 6 A schematic diagram of an optional electronic device structure provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0026] In order to solve the problems mentioned in the background technology, according to one aspect of the embodiments of the present application, an embodiment of an air conditioner evaporator control method is provided.

[0027] like Figure 1 As shown, the above air conditioner evaporator control method can be applied to Figure 1In the hardware environment shown. The system architecture 100 of the hardware environment includes a terminal device 101 and a server 103. The server 103 is connected to the terminal 101 through a network and can be used to provide services for the terminal or a client installed on the terminal. A database 105 can be set on the server or independently of the server to provide data storage services for the server 103. The network can include various connection types, such as wired, wireless communication links or optical fiber cables, etc.

[0028] The user can use the terminal device 101 to interact with the server 103 through the network to receive or send messages, etc. Various communication client applications can be installed on the terminal device 101, such as web browser applications, search applications, instant messaging tools, etc. Among them, the terminal device 101 can be various electronic devices with a display screen and supporting web browsing, including but not limited to smart phones, tablet computers, e-book readers, MP3 players (Moving Picture Experts Group Audio Layer III, dynamic image experts compression standard audio layer 3), MP4 (Moving Picture Experts Group Audio Layer IV, dynamic image experts compression standard audio layer 4) players, laptops and desktop computers, etc. The server 103 can be a server that provides various services, such as a background server that supports the pages displayed on the terminal device 101.

[0029] It should be noted that the air conditioner evaporator control method provided in the embodiment of the present application is generally executed by a server and / or a terminal device, and accordingly, the air conditioner evaporator control device is generally arranged in the server / terminal device. Figure 1 The number of terminal devices, networks and servers in the embodiment is only for illustration. Any number of terminal devices, networks and servers may be provided according to implementation requirements.

[0030] like Figure 2 As shown, Figure 2 A flow chart of an air conditioner evaporator control method provided by an embodiment of the present invention. Taking the air conditioner evaporator control method executed by a server as an example, an air conditioner evaporator control method includes the following steps:

[0031] Step S202, under the target operation mode, a temperature difference is determined according to the inner tube temperature of the evaporator tube temperature bag branch and the anti-freezing temperature, and a refrigerant bias level of the evaporator is determined based on the temperature difference.

[0032] The air conditioner evaporator control method provided in this embodiment is applicable to various types of air conditioners, including wall-mounted air conditioners, floor-standing air conditioners, hidden air conditioners, window air conditioners, central air conditioners, etc.

[0033] In this embodiment, the temperature-sensing bag branch of the evaporator may refer to the only branch of the evaporator with a temperature sensor and is unique. The inner tube temperature refers to the temperature detected by the temperature sensor on the temperature-sensing bag branch. The evaporation temperature refers to the temperature of each branch on the evaporator. The evaporator temperature of the temperature-sensing bag branch is equal to the inner tube temperature. When there is no bias, the evaporation temperature of each branch of the evaporator is basically equal. When there is bias, the evaporator temperature of each branch is different. The target operation mode may refer to the operation mode corresponding to the frost phenomenon of the evaporator, including the cooling mode and the dehumidification mode. The anti-freezing temperature can be pre-set according to the actual situation. In this embodiment, considering that the temperature at which water freezes into ice is 0°C, the anti-freezing temperature can be set to 0°C. Of course, considering the delay in detection, the anti-freezing temperature can also be set to 1°C. The refrigerant bias level can be used to indicate the severity of the refrigerant bias situation. Refrigerant bias situations of different severity correspond to different opening adjustments of the electronic expansion valve.

[0034] In this embodiment, the inner tube temperature of the temperature-sensing bag branch of the air-conditioning evaporator can be obtained in real time or periodically through the temperature detection device, and the temperature difference is calculated according to the inner tube temperature and the anti-freeze entry temperature. Temperature differences of different sizes correspond to different refrigerant bias levels, and then the refrigerant bias level corresponding to the evaporator is determined, and the opening adjustment of the electronic expansion valve is controlled according to the corresponding refrigerant bias level.

[0035] Step S204, adjusting the opening of the electronic expansion valve according to the refrigerant bias level of the evaporator, and obtaining the operating time of the compressor when the refrigerant bias level of the evaporator reaches the highest bias level.

[0036] In this embodiment, after determining the corresponding refrigerant bias level according to different temperature differences, the electronic expansion valve can be adjusted to open different openings at different speeds based on the corresponding refrigerant bias level. The smaller the temperature difference, the more serious the bias situation is, and the electronic expansion valve needs to be opened quickly and the opening is adjusted to be larger, so that more refrigerant can enter the bias branch pipe to quickly alleviate the bias. On the contrary, the larger the temperature difference, the milder the bias situation is, and the electronic expansion valve opening can be slowly opened or the current opening of the electronic expansion valve can be maintained to ensure that a small amount of refrigerant is added or the current refrigerant flow rate is continued to enter the bias branch pipe to alleviate the bias.

[0037] More specifically, the refrigerant flow rate entering the evaporator increases, and the superheat temperature of the bias flow branch decreases. As the amount of refrigerant entering the evaporator increases, the flow difference between the normal branch and the bias flow branch becomes smaller, and the evaporation temperature difference of each branch will also become smaller, thereby solving or alleviating the bias flow of the evaporator, and further making the branches of the evaporator free of frost or lightly frosted. If frost exists, the air conditioner can enter anti-freeze protection in time and quickly melt the light frost. Among them, the above-mentioned bias flow branch refers to a branch where the refrigerant amount is lower than the set refrigerant amount standard range and the inner tube temperature of the evaporator is higher than the set standard temperature range. It can be one or more branches. The temperature sensing bag branch in the present invention belongs to the bias flow branch. The above-mentioned normal branch refers to a branch where the refrigerant amount meets the set refrigerant amount standard range and the inner tube temperature of the evaporator is also within the set standard temperature range. The normal branch can be one or more branches.

[0038] In this embodiment, when it is determined that the refrigerant bias level of the evaporator has reached the highest bias level, it means that the bias is relatively serious. Even if the electronic expansion valve is controlled to open to the maximum, there will still be serious bias, which will lead to the risk of thick frost and incomplete defrosting. The running time of the compressor at the highest bias level can indirectly indicate the degree of bias and frost. In this regard, it can be determined whether it is necessary to switch to the heating mode for defrosting in combination with the running time of the air-conditioning compressor at the highest bias level. Among them, the running time of the compressor at the highest bias level can be counted by a timing device.

[0039] Step S206, if the operation time of the compressor reaches a preset time threshold at the highest bias flow level, the air conditioner is switched to heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is reversed at the lowest speed.

[0040] In this embodiment, the air guide plate of the air conditioner refers to the air guide plate of the indoor unit of the air conditioner, which can control the direction of the air at the air outlet. The indoor fan refers to the motor of the indoor unit of the air conditioner, which can realize heat exchange and air circulation and adjust the indoor temperature. If the operating time of the compressor reaches the preset time threshold at the highest bias flow level, it means that the frost on the evaporator is relatively thick and needs to be defrosted as soon as possible. In this regard, the air conditioner is switched from the cooling mode or the dehumidification mode to the heating mode. After the switching to the heating mode, the air guide plate is closed, which is equivalent to the air outlet being closed, thereby avoiding the hot air from blowing out of the air outlet after the heating mode, affecting the user's comfort. At the same time, the indoor fan is controlled to reverse at the lowest speed. The lower the speed, the smaller the hot air generated and the smaller the impact on comfort. And controlling the indoor fan to reverse can blow the hot air to the evaporator, so that the frost on the evaporator melts quickly. After the frost on the evaporator is completely removed, the air conditioner switches to the original cooling mode or dehumidification mode to continue running.

[0041] In an embodiment of the present invention, under the target operation mode, the refrigerant bias flow level corresponding to the evaporator is determined according to the temperature difference, and the opening of the electronic expansion valve is adjusted accordingly according to the refrigerant bias flow level, which is conducive to more accurate control of the refrigerant flow entering the evaporator, improving the heat exchange rate and accurately controlling the air conditioner to enter anti-freeze protection; and because the refrigerant flow of the normal branch is large enough, and the volume of each branch remains unchanged, the increased refrigerant mainly enters the bias flow branch, so that the overheat temperature of the bias flow branch decreases, and finally the flow difference between the normal branch and the bias flow branch becomes smaller, and the evaporation temperature difference of each branch will also become smaller, thereby solving or alleviating the bias flow problem of the evaporator and ensuring that each branch of the evaporator is not frosted or thinly frosted. Secondly, when the highest bias flow level is reached and the compressor operation time reaches the preset time threshold, the air conditioner can be switched to heating mode for defrosting. The air guide plate of the air conditioner is controlled to be closed, and the hot air will not blow out from the air outlet, so the user will not feel the hot air blowing out. The internal fan is reversed at the lowest speed, and the hot air blown out is small and will be blown to the evaporator, so that the ice on the evaporator melts quickly, which is more conducive to shortening the heating defrosting time and has less impact on user comfort. In addition, through logical control, compared with the method of adding bypass pipes and other components to solve bias flow and defrosting, it is less costly and more practical.

[0042] In an optional embodiment, the above step S202 specifically includes:

[0043] Acquire the operation mode of the air conditioner, and determine whether the operation mode is the target operation mode, where the target operation mode includes a cooling mode and a dehumidification mode;

[0044] If the operation mode is the cooling mode or the dehumidification mode, the inner tube temperature of the evaporator tube temperature bag branch is obtained;

[0045] Calculating the temperature difference between the inner tube temperature and the antifreeze entry temperature;

[0046] The temperature difference condition satisfied by the temperature difference value is determined, and the refrigerant bias level of the evaporator is determined according to the corresponding temperature difference condition.

[0047] In this embodiment, when the air conditioner is turned on and the compressor is started, the current operation mode of the air conditioner can be obtained to determine whether the current operation mode is cooling mode or dehumidification mode. Only in cooling mode and dehumidification mode will the evaporator be frosted. If it is cooling mode or dehumidification mode, the inner tube temperature of the evaporator can be obtained through the temperature detection device on the evaporator tube temperature bag branch.

[0048] Furthermore, the temperature difference can be calculated based on the collected inner tube temperature and the anti-freeze entry temperature to determine the temperature difference condition that is satisfied. Different temperature difference conditions correspond to different refrigerant bias levels. In the present embodiment, the refrigerant bias levels include primary bias, secondary bias and tertiary bias with increasing bias degrees. The opening control degrees of the electronic expansion valves corresponding to the primary bias, secondary bias and tertiary bias are different, and there will also be three different temperature difference conditions corresponding to the primary bias, secondary bias and tertiary bias.

[0049] In this embodiment, in the cooling mode or the dehumidification mode, the inner tube temperature of the evaporator tube temperature bag branch is detected, and it is determined whether the temperature difference between the inner tube temperature and the anti-freeze temperature meets different temperature difference conditions, and then the corresponding refrigerant bias flow level is determined. The opening of the electronic expansion valve is adjusted accordingly according to the refrigerant bias flow level, which is conducive to more accurate control of the refrigerant flow entering the evaporator, improves the heat exchange rate, and is conducive to accurately controlling the air conditioner to enter the anti-freeze protection and quickly defrost.

[0050] In an optional embodiment, in the above steps: determining the temperature difference condition satisfied by the temperature difference value, and determining the refrigerant bias level of the evaporator according to the corresponding temperature difference condition, specifically includes:

[0051] Compare the temperature difference with each preset temperature difference range to determine whether the temperature difference satisfies the preset temperature difference range;

[0052] If the temperature difference satisfies the first preset temperature difference range, it is determined that the refrigerant bias flow level is the first level bias flow;

[0053] If the temperature difference satisfies the second preset temperature difference range, it is determined that the refrigerant bias flow level is the secondary bias flow;

[0054] If the temperature difference satisfies the third preset temperature difference range, it is determined that the refrigerant bias flow level is the third level bias flow.

[0055] In this embodiment, the refrigerant bias flow levels include primary bias flow, secondary bias flow and tertiary bias flow with increasing bias flow degrees. The temperature difference corresponding to the first preset temperature difference range is higher than that of the second preset temperature difference range, and the temperature difference corresponding to the second preset temperature difference range is higher than that of the third preset temperature difference range. The smaller the temperature difference, the more serious the bias flow. Calculate the inner tube temperature (T 内管 ) and the antifreeze temperature (T 进入防冻结温度 ) to determine the severity of the bias flow, including:

[0056] When T is detected 内管 -T 进入防冻结温度> a, it is determined to meet the first preset temperature difference range, and the refrigerant bias level of the evaporator is level one. At this time, the system bias is slight and has little impact on the air conditioning system. The current opening can be maintained and continued to operate. Since the temperature at which water turns into ice is 0°C, T 进入防冻结温度 It can be set at 0°C or set to 1°C considering the delay in detection; a is the first bias current preset value, which can be set to 6-8°C.

[0057] When it is detected that a≤T 内管 -T 进入防冻结温度 <b, it is determined to be in line with the second preset temperature difference range, and the refrigerant bias level of the evaporator is secondary bias. At this time, the system bias is moderate, which may affect the frosting and defrosting of the system. For this, the refrigerant flow needs to be increased. Among them, b is the second bias preset value, which can be set to 4-6℃.

[0058] When T is detected 内管 -T 进入防冻结温度 ≤b, it is judged to be in compliance with the third preset temperature difference range, and the refrigerant bias level of the evaporator is level 3 bias. At this time, the system bias is serious, which is likely to affect the frosting and defrosting of the system. For this, a larger refrigerant flow rate needs to be input.

[0059] It should be noted that the above bias flow preset values ​​are only taken as examples for general situations. Since the actual air-conditioning systems are different, the bias flow preset values ​​may also be different. Therefore, the bias flow preset values ​​can be adaptively adjusted according to the corresponding systems.

[0060] In this embodiment, the refrigerant bias level is determined based on the temperature difference. By accurately judging the refrigerant bias level, it can be ensured that the air-conditioning system can accurately control the opening of the electronic expansion valve in the cooling or dehumidification state, and then accurately control the refrigerant flow entering the bias branch, thereby solving or alleviating the bias situation, and can also perform defrosting to ensure stable operation of the system and improve user comfort.

[0061] In an optional embodiment, the above step S204 specifically includes:

[0062] If the refrigerant bias flow level of the evaporator is the first-level bias flow, the operation is maintained with the current opening of the electronic expansion valve;

[0063] If the refrigerant bias flow level of the evaporator is the secondary bias flow, the opening degree of the electronic expansion valve is controlled to increase by using the first opening degree adjustment parameter;

[0064] If the refrigerant bias level of the evaporator is the third-level bias, the opening of the electronic expansion valve is controlled to increase with the second opening adjustment parameter, and the operating time of the compressor is obtained, wherein the second opening adjustment parameter is greater than the first opening adjustment parameter.

[0065] In this embodiment, corresponding to different refrigerant bias flow levels, the opening control of the electronic expansion valve is different, specifically distinguished by maintaining the original opening, the first opening adjustment parameter and the second opening adjustment parameter. The electronic expansion valve executes relevant commands to different degrees according to the corresponding refrigerant bias flow level.

[0066] In some examples, if the refrigerant bias level of the evaporator is level one, the temperature difference between the branches of the evaporator is small, and usually the maximum temperature difference between the branches is around 4-5°C, which has little impact on the system. However, if the temperature difference decreases further, it will have a greater impact on the air-conditioning system. At this time, the electronic expansion valve is prohibited from opening small, and the current opening of the electronic expansion valve is maintained to continue to operate. Because the bias is small, as the refrigerant flow enters the bias branch, the evaporator temperature of the bias branch will drop, and finally the evaporator temperature of each branch will reach thermal equilibrium until there is no bias, and the air-conditioning system operates stably. When T 内管 >T 进入防冻结温度 When the temperature is above 0℃ or 1℃, the air conditioner indoor unit will not frost and the anti-freeze protection will not be activated. It can continue to cool or dehumidify without affecting the user's comfort.

[0067] In other examples, if the refrigerant bias level of the evaporator is a secondary bias, the temperature difference of each branch of the evaporator is moderate, and the maximum temperature difference of each branch is about 6°C to 8, which may affect the frosting and defrosting of the system. The electronic expansion opening can be adjusted based on the first opening adjustment parameter to slowly open at a speed V1, for example, at 6P / 20s, and the maximum rising opening cannot exceed N1P, for example, cannot exceed 40P. As the electronic expansion valve opens, and the refrigerant flow of the normal branch is large enough, while the volume of each branch remains unchanged, the refrigerant increased by the opening is mainly entered into the bias branch, so that the superheat temperature of the bias branch decreases. The opening of the electronic expansion valve is controlled by the first opening adjustment parameter, and the refrigerant flow entering the evaporator is limited, and the bias may not be completely resolved. Finally, the temperature of each branch evaporator cannot reach thermal equilibrium, and each branch of the evaporator may not frost or frost thinly. However, as the refrigerant flow enters, it gradually becomes stable, and the temperature difference between the normal branch and the biased branch becomes smaller and smaller. The temperature difference is below 4°C. Even if the normal branch has been frosted, the temperature difference between the two is small at this time, and the T of the temperature sensing bag branch is 内管 It will also quickly drop to T 进入防冻结温度 , and then the air conditioner enters anti-freeze protection, which melts the thin frost on the normal branch circuit and prevents freezing and deterioration.

[0068] In other examples, when the refrigerant bias level of the evaporator reaches the third level of bias, the temperature difference between the branches of the evaporator is large. Usually, the maximum temperature difference between the branches can reach about 9°C to 12°C. Severe bias will affect the frosting and defrosting of the system. At this time, the electronic expansion opening is adjusted with the second opening adjustment parameter to quickly open at a speed of V2, such as 6P / 10s, but the maximum rising opening cannot exceed N2P, for example, cannot exceed 60P. As the electronic expansion valve opens faster, the refrigerant flow of the bias branch increases rapidly, and the temperature of the evaporator of the bias branch also drops faster. Finally, the temperature of each branch of the evaporator cannot reach thermal equilibrium. Even after reaching stability, there is still a relatively large difference in temperature between the normal branch and the bias branch, usually above 4°C. At this time, when the normal branch has thick frost, the T of the temperature sensing bag branch 内管 Only then reduced to T 进入防冻结温度 Although the air conditioner has entered anti-freeze protection, there is a risk that the normal branch defrost is not clean. To prevent frost from accumulating over time, the operating time of the air conditioner compressor in the three-level bias flow state can be obtained. The operating mode of the air conditioner can be controlled based on the operating time to defrost as soon as possible without affecting user comfort and ensure normal operation of the system.

[0069] It should be noted that the opening of the electronic expansion valve has a great influence on the system flow and cannot be opened infinitely. Otherwise, too much refrigerant cannot be completely evaporated after entering the evaporator, which can easily cause the compressor to be compressed with liquid and damage the compressor. Therefore, the maximum rising opening needs to be set. For example, the maximum rising opening cannot exceed N2P.

[0070] In this embodiment, when each branch of the evaporator is in the first level of bias flow, maintaining the current opening of the electronic expansion valve can completely solve the bias flow, ensure uniform heat exchange of the evaporator, and thus improve the heat exchange efficiency. When each branch of the evaporator is in the second level of bias flow, the electronic expansion valve is opened based on the first opening adjustment parameter, and when each branch of the evaporator is in the third level of bias flow, the electronic expansion valve is opened based on the second opening adjustment parameter, and the refrigerant flow is increased to different degrees, and the temperature difference of each branch is reduced, thereby solving or alleviating the bias flow of the evaporator, and further ensuring that each branch of the evaporator is not frosted or thinly frosted.

[0071] In an optional embodiment, after the above step S204, the method further includes:

[0072] Comparing the inner tube temperature of the evaporator tube temperature bulb branch with the entry antifreeze temperature and the exit antifreeze temperature;

[0073] If the inner tube temperature is lower than the anti-freezing temperature, it is determined that the air conditioner enters the anti-freezing protection, and the outdoor unit of the air conditioner is controlled to shut down;

[0074] When entering the anti-freeze protection, when it is detected that the inner pipe temperature is higher than the exit anti-freeze temperature, the anti-freeze protection is exited and the air conditioner outdoor unit is controlled to start.

[0075] Combination Figure 3 As shown, in this embodiment, the above-mentioned exit antifreeze temperature corresponds to the temperature for exiting the antifreeze protection, which is a preset value, generally 10-12° C. Since increasing the opening of the electronic expansion valve can slow down the bias flow, there are situations that may not be completely solved, such as in the case of severe bias flow, so the evaporator temperature may continue to drop.

[0076] In some examples, the evaporator T 内管 , when T is detected 内管 ≤T 进入防冻结温度 When the outdoor unit is turned off, the air conditioner enters the anti-freeze protection state, the outdoor unit stops, and the indoor unit continues to operate unchanged. After the outdoor unit stops, the air conditioner does not cool or dehumidify, the evaporation temperature rises, and the frost and ice on the evaporator melt.

[0077] In other examples, continue to detect T 内管 After entering the anti-freeze protection, the evaporation temperature gradually increases. When T 内管 ≥T 退出防冻结温度 , it is determined that the air conditioner has exited the anti-freeze protection. After the air conditioner exits the anti-freeze protection, the outdoor compressor starts, and the air conditioner continues to operate in the original cooling or dehumidification state.

[0078] In this embodiment, when T 内管 ≤T 进入防冻结温度 When the frost is very thin, it can enter the anti-freeze protection in time, quickly melt the thin frost, and alleviate the problem of evaporator deviation and frosting. In addition, it enters the anti-freeze protection when the frost layer is very thin, and will not freeze and cause deterioration. At the same time, when T 内管 ≥T 退出防冻结温度 It can exit the anti-freeze protection in time and maintain the original operation mode, saving energy while ensuring the reliability of system operation and continuously providing users with cooling or dehumidification functions.

[0079] In an optional embodiment, the above step S206 specifically includes:

[0080] Determining whether the continuous operation time of the compressor reaches a first preset time threshold, and determining whether the accumulated operation time of the compressor reaches a second preset time threshold, the second preset time threshold being greater than the first preset time threshold;

[0081] If the continuous operation time of the compressor reaches the first preset time threshold, or the cumulative operation time of the compressor reaches the second preset time threshold, the operation mode of the air conditioner is converted to the heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is reversed at the lowest speed.

[0082] Combination Figure 3 As shown, in this embodiment, when the evaporator reaches the third level of bias flow, the operation time of the compressor begins to be counted, wherein the operation time includes the continuous operation time and the cumulative operation time of the compressor. For the continuous operation time, during the third level of bias flow, if the air conditioner does not have anti-freeze protection, the compressor will continue to run for cooling or dehumidification, and the frost on the evaporator will form quickly and thickly in a short time. For the cumulative operation time, if the anti-freeze protection occurs during the third level of bias flow, the compressor stops running during the anti-freeze protection period, the evaporation temperature rises, and the frost on the evaporator will be partially melted. In this case, the frost in the evaporator becomes thicker and requires a longer time to defrost. By separately counting the continuous operation time and the cumulative operation time of the compressor, it is beneficial to conduct specific analysis for different working conditions, and then it is beneficial to improve the control accuracy of the air conditioner operation. During the statistical operation time, if the compressor stops, the previously counted continuous operation time is reset to zero and converted to the cumulative operation time statistics. After the compressor is restarted, the continuous operation time statistics are restarted.

[0083] Furthermore, if the acquired running time is the continuous running time, it can be determined whether the continuous running time reaches the first preset time threshold; if the acquired running time is the cumulative running time, it can be determined whether the continuous running time reaches the second preset time threshold. Among them, the icing situation during the continuous running time is more serious than the cumulative running time, and timely defrosting is required, so the set first preset time threshold needs to be less than the second preset time threshold.

[0084] In some examples, if the continuous operation time of the compressor reaches the first preset time threshold, or the cumulative operation time of the compressor reaches the second preset time threshold, the operation mode of the air conditioner is switched to the heating mode for defrosting. At this time, the air guide plate is closed, and the internal fan is reversed at the lowest minimum speed to blow hot air to the frozen evaporator, shortening the heating and defrosting time. Closing the air guide plate can prevent hot air from blowing out of the air outlet and onto the user. The user cannot feel the hot air blowing out during the defrosting process, thereby ensuring the user's comfort. For example: 持续运行时长 ≥N1 hour, or t 累积运行时长 ≥N2 hours, it switches to heating mode.

[0085] In other examples, if the continuous operation time of the compressor does not reach the first preset time threshold, or the cumulative operation time of the compressor does not reach the second preset time threshold, the mode is not switched to the heating mode, and the original operation mode is maintained.

[0086] In this embodiment, by obtaining the continuous operation time or cumulative operation time of the compressor under the three-level bias flow state for analysis, it is possible to switch to the heating mode for defrosting in time according to different situations, thereby accelerating the defrosting action. In the heating mode, the air guide plate of the indoor unit is closed, hot air will not blow out from the air outlet, people will not feel the hot air, and the indoor fan runs at the lowest speed, the smaller the hot air generated will be, and the smaller the impact on user comfort will be. After the indoor fan reverses, it will blow the hot air to the evaporator, so that the frost on the evaporator will melt quickly, which is conducive to shortening the heating defrosting time without affecting the user's comfort. After the frost on the evaporator is completely removed, the air conditioner operates in the original cooling state.

[0087] In an optional embodiment, after the operation mode of the air conditioner is converted to the heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is controlled to be reversed at the lowest speed, the method further includes:

[0088] In the heating mode, the inner tube temperature of the evaporator tube temperature bag branch is obtained to determine whether the inner tube temperature exceeds the high temperature protection threshold;

[0089] If the inner tube temperature exceeds the high temperature prevention temperature threshold, the operation is switched to the operation mode before starting the heating mode after running in the heating mode for the first high temperature setting time;

[0090] If the inner tube temperature does not exceed the high temperature prevention temperature threshold, the operation is switched to the operation mode before starting the heating mode after running in the heating mode for a second high temperature setting time, and the second high temperature setting time is longer than the first high temperature setting time;

[0091] The number of times the operation mode is switched to the heating mode within a preset unit time is obtained, and if the number of times the operation mode is switched to the heating mode reaches a heating number threshold, an early warning prompt is issued.

[0092] Combination Figure 3 As shown, in this embodiment, the effect of heating and defrosting is related to the temperature of the inner tube in the heating mode. The higher the temperature of the inner tube, the faster the defrosting; conversely, it takes a longer time. However, considering the comfort of the user, it is necessary to constrain the defrosting time of heating and defrosting to avoid excessive heating after the defrosting is completed, resulting in hot air blowing out. Specifically, the inner tube temperature of the evaporator tube temperature bag branch can be obtained in the heating mode to determine whether it exceeds the high temperature protection threshold, where the high temperature protection threshold is the high temperature limit value that the temperature can reach during the defrosting heating process, which is used as a high temperature reference for the inner tube temperature and can be set to 55-58°C.

[0093] In some examples, when the inner tube temperature is detected to exceed the high temperature protection threshold in the heating mode, the air conditioner stops heating and defrosting after the first high temperature setting time, and switches to the cooling or dehumidification mode before starting the heating mode. The first high temperature setting time can be set to 3 to 5 minutes.

[0094] In other examples, when the inner tube temperature is detected to be lower than the high temperature protection threshold in the heating mode, the air conditioner stops heating and defrosting after the second high temperature setting time, and switches to the cooling or dehumidification mode before starting the heating mode. The second high temperature setting time can be set to 6 to 8 minutes.

[0095] More specifically, when the inner tube temperature exceeds the high temperature protection threshold, it means that the inner tube temperature is higher than the case where the temperature does not exceed the high temperature protection threshold. Therefore, the second high temperature setting time is greater than the first high temperature setting time to ensure that the heating mode is exited in time after the frost on the evaporator is removed, and the original operating mode is restored to continue running to avoid the hot air blowing affecting the user's comfort.

[0096] In this embodiment, the above-mentioned preset unit time can be 12 hours, 24 hours, etc.; the above-mentioned preset number of times is generally taken as 4 to 5 times. Of course, it can also be adaptively adjusted in combination with actual conditions, and is not limited here. By counting the number of operations M of switching to the heating mode for defrosting within the preset unit time, it is determined whether M is greater than or equal to the preset number of times m. If M≥m, the code is reported and stops flashing after a certain length of time or number of times, to achieve an early warning prompt, which is used to remind the user to clean the evaporator or check whether there is a foreign object blocking the air inlet. Among them, the code is only used for reminders, not faults, and the air conditioner will maintain normal operation. In many cases, the evaporator bias is caused by the evaporator being dirty and blocked, and foreign objects blocking the air inlet. If the heating defrost is entered many times, it means that the bias is more serious, which will affect the cooling capacity of the air conditioner. Therefore, by setting relevant codes, the user is reminded to deal with it. Of course, in addition to the flashing prompt, it can also be combined with the sound and light warning method for prompting, or when the air conditioner is controlled in an intelligent way, prompts can be given by sending prompt information and other methods.

[0097] In this embodiment, by comparing the inner tube temperature in the heating mode with the high temperature protection threshold, the duration of high temperature defrosting is controlled for the cases where the temperature exceeds the high temperature protection threshold and the temperature does not exceed the high temperature protection threshold, so as to prevent the high temperature from continuing during the heating and defrosting process, causing hot air to blow out and affecting the user's comfort. In addition, by counting the number of defrosting operations in the heating mode, when the number of operations reaches the heating number threshold, an early warning prompt is given to the user in a timely manner, reminding the user to clean the evaporator or check whether there is any foreign matter blocking the air inlet to avoid affecting the cooling capacity of the air conditioner.

[0098] Combination Figure 4 As shown, in order to more clearly illustrate the technical solution of the present application, the following provides a reference example of the specific control logic operation of the air conditioner in the cooling mode. The control method of the dehumidification mode is the same. The specific process is as follows:

[0099] D1: The air conditioner is turned on, the compressor starts, and it runs in cooling mode.

[0100] D2: After the compressor is started, the air conditioner starts cooling, the evaporation temperature of each branch of the evaporator decreases, and the T of the temperature sensing branch begins to be detected. 内管 .

[0101] D3: Detection of T 内管 With T 进入防冻结温度 The temperature difference is used to judge the severity of the bias flow. The electronic expansion valve executes relevant commands according to different degrees, which are specifically divided into the following: D3.1: When T 内管 -T 进入防冻结温度 >6℃ (in line with the first preset temperature difference range), the system bias is judged to be slight, belonging to the first level bias, and the electronic expansion valve is prohibited from opening small and maintains the current opening. D3.2: When a≤T 内管 -T 进入防冻结温度 <4℃ (in line with the second preset temperature difference range), the system bias current is judged to be medium, belonging to the second level bias current, and the electronic expansion opening is adjusted to open at a speed of V1=6P / 20s. D3.3: When T 内管 -T 进入防冻结温度 ≤b (in line with the third preset temperature difference range), it is determined that the system bias current is serious, belonging to the third level bias current, and the electronic expansion opening is adjusted to open at a speed of V2=6P / 10s.

[0102] D4: Continue to test T 内管 , if T 内管 Continue to decrease, when T 内管 ≤T 进入防冻结温度 When the air conditioner enters anti-freeze protection, the outdoor unit stops, the air conditioner does not cool, the evaporation temperature rises, and the frost on the evaporator melts.

[0103] D5: Continue to test T 内管 After entering the anti-freeze protection, the evaporation temperature rises. When T 内管 ≥T 退出防冻结温度 , the air conditioner exits the anti-freeze protection. After the air conditioner exits the anti-freeze protection, the outdoor unit compressor starts and continues to operate according to the original cooling state.

[0104] D6: After power on, the compressor starts and continues to detect T 内管 , when T is detected 内管 -T 进入防冻结温度≤4℃ and the continuous operation time meets the first preset time threshold, or T 内管 -T 进入防冻结温度 When the temperature is ≤4℃ and the accumulated running time reaches the second preset time threshold, the compressor enters the heating mode to defrost, the indoor air guide plate is closed, and the indoor fan is reversed at the minimum speed. The first preset time threshold is 4 hours, and the second preset time threshold is 6 hours. Considering comfort, the total defrosting time needs to be limited, which is divided into the following two situations: D6.1: When the detection T 内管 ≥T 防高温温度阈值 When the air conditioner runs for the first high temperature setting time, it stops heating and defrosting. The first high temperature setting time is 5 minutes. D6.2: When the detection T 内管 <T 防高温温度阈值 When the air conditioner runs at the second high temperature setting time, it stops heating and defrosting. The second high temperature setting time is 8 minutes.

[0105] D7: After the evaporator is defrosted, the air conditioner exits the heating mode and switches to the original cooling mode to continue running.

[0106] D8: Count the number of deicing operations in the heating mode M, and determine whether the preset number is met. The preset number m is 5 times.

[0107] D9: When M=m=5 times, the code is reported and flashes for 30 seconds before disappearing, reminding the user to clean the evaporator or check whether there is any foreign matter blocking the air inlet.

[0108] In this embodiment, when the bias flow in each branch of the evaporator is relatively light, maintaining the current opening can completely solve the bias flow, allow the evaporator to exchange heat evenly, and improve the heat exchange efficiency. When the bias flow in each branch of the evaporator is moderate, the electronic expansion opening is opened at a speed of 6P / 20s to reduce the temperature difference between each branch and alleviate the frosting of the evaporator. When the frost layer is very thin, the anti-freeze protection can be entered, and it will not freeze and cause deterioration. When the bias flow in each branch of the evaporator is serious, the electronic expansion opening is opened at a speed of V2=6P / 10s, and the heating mode is switched to defrost. At this time, the air guide plate of the indoor unit is closed, and the indoor fan is reversed at the lowest speed, which not only achieves complete defrosting and avoids the risk of unclean frosting, but also blows hot air to the evaporator to melt the ice on the evaporator quickly, and it will not blow out from the air outlet. The user will not feel the hot air and will not affect the comfort. By controlling the duration of continuous high-temperature defrosting, it is possible to prevent continuous high temperature and hot air from blowing out during the heating and defrosting process, which affects user comfort. By counting the number of defrosting operations in the heating mode, it is possible to provide timely early warnings to users, reminding them to clean the evaporator or check whether there are any foreign objects blocking the air inlet.

[0109] According to another aspect of the embodiment of the present application, Figure 5As shown, corresponding to the air-conditioning evaporator control method in the above embodiment, this embodiment provides an air-conditioning evaporator control device, the device comprising:

[0110] The data acquisition module 501 is used to determine the temperature difference between the inner tube temperature of the evaporator tube temperature bag branch and the anti-freezing temperature under the target operation mode, and determine the refrigerant bias level of the evaporator based on the temperature difference;

[0111] The opening adjustment module 503 is used to adjust the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, and when the refrigerant bias flow level of the evaporator reaches the highest bias flow level, obtain the operation time of the compressor;

[0112] The operation control module 505 is used to switch the air conditioner to the heating mode if the operation time of the compressor reaches a preset time threshold at the highest bias flow level, and control the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed.

[0113] It should be noted that the examples and application scenarios implemented by the above modules and corresponding steps are the same, but are not limited to the contents disclosed in the above embodiments. It should be noted that the above modules as part of the device can be run in Figure 1 In the hardware environment shown, it can be implemented by software or by hardware.

[0114] Optionally, the data acquisition module 501 includes: a first judgment submodule, used to obtain the operating mode of the air conditioner, and determine whether the operating mode is the target operating mode, and the target operating mode includes a cooling mode and a dehumidification mode; a temperature acquisition submodule, used to obtain the inner tube temperature of the evaporator tube temperature bag branch if the operating mode is the cooling mode or the dehumidification mode; a calculation submodule, used to calculate the temperature difference between the inner tube temperature and the entry anti-freeze temperature; a comparison submodule, used to determine the temperature difference condition satisfied by the temperature difference, and determine the refrigerant bias level of the evaporator according to the corresponding temperature difference condition.

[0115] Optionally, the comparison submodule includes: a comparison subunit, used to compare the temperature difference with each preset temperature difference range to determine whether the temperature difference satisfies the preset temperature difference range; a first judgment subunit, used to judge whether the refrigerant bias flow level is the first-level bias flow if the temperature difference satisfies the first preset temperature difference range; a second judgment subunit, used to judge whether the refrigerant bias flow level is the second-level bias flow if the temperature difference satisfies the second preset temperature difference range; and a third judgment subunit, used to judge whether the refrigerant bias flow level is the third-level bias flow if the temperature difference satisfies the third preset temperature difference range.

[0116] Optionally, the opening adjustment module 503 includes: a first control submodule, used to maintain the operation with the current opening of the electronic expansion valve if the refrigerant bias flow level of the evaporator is the first-level bias flow; a second control submodule, used to control the opening of the electronic expansion valve to increase with a first opening adjustment parameter if the refrigerant bias flow level of the evaporator is the second-level bias flow; a third control submodule, used to control the opening of the electronic expansion valve to increase with a second opening adjustment parameter if the refrigerant bias flow level of the evaporator is the third-level bias flow, and obtain the operating time of the compressor, wherein the second opening adjustment parameter is greater than the first opening adjustment parameter.

[0117] Optionally, the device also includes: a comparison module, which is used to compare the inner tube temperature of the evaporator tube temperature bag branch with the entry anti-freeze temperature and the exit anti-freeze temperature; a first anti-freeze control module, which is used to determine that the air conditioner enters anti-freeze protection if the inner tube temperature is lower than the entry anti-freeze temperature, and control the air conditioner outdoor unit to shut down; a second anti-freeze control module, which is used to exit the anti-freeze protection and control the air conditioner outdoor unit to start when it detects that the inner tube temperature is higher than the exit anti-freeze temperature under the anti-freeze protection.

[0118] Optionally, the operating duration includes continuous operating duration and cumulative operating duration, and the operation control module 505 includes: a judgment submodule, used to judge whether the continuous operating duration of the compressor reaches a first preset duration threshold, and judge whether the cumulative operating duration of the compressor reaches a second preset duration threshold, and the second preset duration threshold is greater than the first preset duration threshold; an operation control submodule, used to convert the operating mode of the air conditioner to the heating mode if the continuous operating duration of the compressor reaches the first preset duration threshold, or the cumulative operating duration of the compressor reaches the second preset duration threshold, and control the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed.

[0119] Optionally, the device also includes: a judgment module, which is used to obtain the inner tube temperature of the evaporator tube temperature bag branch in the heating mode, and judge whether the inner tube temperature exceeds the high temperature protection threshold; a first mode switching module, which is used to run in the heating mode for a first high temperature setting time and then switch to the operation mode before starting the heating mode if the inner tube temperature exceeds the high temperature protection threshold; a second mode switching module, which is used to run in the heating mode for a second high temperature setting time and then switch to the operation mode before starting the heating mode if the inner tube temperature does not exceed the high temperature protection threshold, and the second high temperature setting time is greater than the first high temperature setting time; an operation times judgment module, which is used to obtain the number of operations switched to the heating mode in a preset unit time, and if the number of operations switched to the heating mode reaches the heating times threshold, an early warning prompt is issued.

[0120] It should be noted here that the suffixes such as module, sub-module, and sub-unit used to represent elements described in the above device are only for the convenience of description of this application and have no specific meanings themselves. Therefore, they can be used in combination.

[0121] According to another aspect of the embodiment of the present application, the present application provides an air conditioner, such as Figure 6 As shown, it includes a memory 601, a processor 603, a communication interface 605 and a communication bus 607. The memory 601 stores a computer program that can be run on the processor 603. The memory 601 and the processor 603 communicate through the communication interface 605 and the communication bus 607. When the processor 603 executes the computer program, the steps of the above-mentioned air conditioning evaporator control method are implemented.

[0122] The memory and processor in the above-mentioned electronic device communicate through a communication bus and a communication interface. The communication bus can be a peripheral component interconnect standard PCI bus or an extended industrial standard structure EISA bus, etc. The communication bus can be divided into an address bus, a data bus, a control bus, etc. The memory can include a random access memory RAM, and can also include a non-volatile memory (non-volatile memory), such as at least one disk storage. Optionally, the memory can also be at least one storage device located away from the above-mentioned processor. The above-mentioned processor can be a general-purpose processor, including a central processing unit CPU, a network processor NP, etc.; it can also be a digital signal processor DSP, an application-specific integrated circuit ASIC, a field programmable gate array FPGA or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0123] According to another aspect of the embodiments of the present application, a computer program product or a computer program is provided, the computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the steps of the air conditioner evaporator control method in any of the above embodiments.

[0124] It is understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or a combination thereof. For hardware implementation, the processing unit may be implemented in one or more application specific integrated circuits, digital signal processors, digital signal processing devices, microprocessors, and other electronic units or a combination thereof for performing the functions described herein. For software implementation, the techniques described herein may be implemented by units that perform the functions described herein. The software code may be stored in a memory and executed by a processor.

[0125] Those skilled in the art can appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0126] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0127] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, each functional unit in each embodiment of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0128] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application can be essentially or partly embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0129] It should be noted that, in this article, relational terms such as first, second, etc. are used only to distinguish one entity or operation from another entity or operation. The terms include, comprise, or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device.

[0130] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An air conditioning evaporator control method, characterized in that: The method comprises: In the target operation mode, a temperature difference is determined according to the inner tube temperature of the evaporator tube temperature bag branch and the inlet antifreeze temperature, and a refrigerant bias level of the evaporator is determined based on the temperature difference; adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, and obtaining the operating time of the compressor when the refrigerant bias flow level of the evaporator reaches a maximum bias flow level; If the operating time of the compressor reaches the preset time threshold at the highest bias flow level, the air conditioner is switched to heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is reversed at the lowest speed.

2. The air conditioning evaporator control method according to claim 1, characterized in that: In the target operation mode, the temperature difference is determined according to the inner tube temperature of the evaporator tube temperature bag branch and the inlet anti-freezing temperature, and the refrigerant bias level of the evaporator is determined based on the temperature difference, including: Acquire the operation mode of the air conditioner, and determine whether the operation mode is the target operation mode, where the target operation mode includes a cooling mode and a dehumidification mode; If the operation mode is the cooling mode or the dehumidification mode, the inner tube temperature of the evaporator tube temperature bag branch is obtained; Calculating the temperature difference between the inner tube temperature and the antifreeze entry temperature; The temperature difference condition satisfied by the temperature difference value is determined, and the refrigerant bias level of the evaporator is determined according to the corresponding temperature difference condition.

3. The air conditioning evaporator control method according to claim 2, characterized in that: The refrigerant bias flow levels include primary bias flow, secondary bias flow and tertiary bias flow with increasing bias flow degrees, and the temperature difference condition satisfied by the temperature difference value is determined, and the refrigerant bias flow level of the evaporator is determined according to the corresponding temperature difference condition, including: Compare the temperature difference with each preset temperature difference range to determine whether the temperature difference satisfies the preset temperature difference range; If the temperature difference satisfies the first preset temperature difference range, it is determined that the refrigerant bias flow level is the first level bias flow; If the temperature difference satisfies the second preset temperature difference range, it is determined that the refrigerant bias flow level is the secondary bias flow; If the temperature difference satisfies the third preset temperature difference range, it is determined that the refrigerant bias flow level is the third level bias flow.

4. The air conditioning evaporator control method according to claim 2, characterized in that: The step of adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, and obtaining the operation time of the compressor when the refrigerant bias flow level of the evaporator reaches a maximum bias flow level, includes: If the refrigerant bias flow level of the evaporator is the first-level bias flow, the operation is maintained with the current opening of the electronic expansion valve; If the refrigerant bias flow level of the evaporator is the secondary bias flow, the opening degree of the electronic expansion valve is controlled to increase by using the first opening degree adjustment parameter; If the refrigerant bias level of the evaporator is the third-level bias, the opening of the electronic expansion valve is controlled to increase with the second opening adjustment parameter, and the operating time of the compressor is obtained, wherein the second opening adjustment parameter is greater than the first opening adjustment parameter.

5. The air conditioning evaporator control method according to any one of claims 1 to 4, characterized in that: After adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, the method further includes: Comparing the inner tube temperature of the evaporator tube temperature bulb branch with the entry antifreeze temperature and the exit antifreeze temperature; If the inner tube temperature is lower than the anti-freezing temperature, it is determined that the air conditioner enters the anti-freezing protection, and the outdoor unit of the air conditioner is controlled to shut down; When entering the anti-freeze protection, when it is detected that the inner pipe temperature is higher than the exit anti-freeze temperature, the anti-freeze protection is exited and the air conditioner outdoor unit is controlled to start.

6. The air conditioning evaporator control method according to any one of claims 1 to 4, characterized in that: The running time includes continuous running time and accumulated running time. If the running time of the compressor reaches a preset time threshold at the highest bias flow level, the air conditioner is switched to heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is controlled to reverse at the lowest speed, including: Determining whether the continuous operation time of the compressor reaches a first preset time threshold, and determining whether the accumulated operation time of the compressor reaches a second preset time threshold, the second preset time threshold being greater than the first preset time threshold; If the continuous operation time of the compressor reaches the first preset time threshold, or the cumulative operation time of the compressor reaches the second preset time threshold, the operation mode of the air conditioner is converted to the heating mode, and the air guide plate of the air conditioner is controlled to be closed and the internal fan is reversed at the lowest speed.

7. The air conditioning evaporator control method according to claim 6, characterized in that: After converting the operation mode of the air conditioner to the heating mode, and controlling the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed, the method further includes: In the heating mode, the inner tube temperature of the evaporator tube temperature bag branch is obtained to determine whether the inner tube temperature exceeds the high temperature protection threshold; If the inner tube temperature exceeds the high temperature prevention temperature threshold, the operation is switched to the operation mode before starting the heating mode after running in the heating mode for the first high temperature setting time; If the inner tube temperature does not exceed the high temperature prevention temperature threshold, the operation is switched to the operation mode before starting the heating mode after running in the heating mode for a second high temperature setting time, and the second high temperature setting time is longer than the first high temperature setting time; The number of times the operation mode is switched to the heating mode within a preset unit time is obtained, and if the number of times the operation mode is switched to the heating mode reaches a heating number threshold, an early warning prompt is issued.

8. An air conditioner evaporator control device, characterized in that: The device comprises: A data acquisition module, used to determine a temperature difference according to an inner tube temperature of a tube temperature bag branch of an evaporator and an inlet antifreeze temperature under a target operation mode, and determine a refrigerant bias level of the evaporator based on the temperature difference; an opening adjustment module, used for adjusting the opening of the electronic expansion valve according to the refrigerant bias flow level of the evaporator, and obtaining the operation time of the compressor when the refrigerant bias flow level of the evaporator reaches the highest bias flow level; The operation control module is used to switch the air conditioner to heating mode if the operating time of the compressor reaches a preset time threshold at the highest bias flow level, and control the air guide plate of the air conditioner to close and the internal fan to reverse at the lowest speed.

9. An air conditioner, comprising a memory, a processor, a communication interface and a communication bus, wherein the memory stores a computer program that can be run on the processor, and the memory and the processor communicate through the communication bus and the communication interface, characterized in that: When the processor executes the computer program, the air conditioner evaporator control method according to any one of claims 1 to 7 is implemented.

10. A computer readable medium having a non-volatile program code executable by a processor, characterized in that: The program code enables the processor to execute the air conditioner evaporator control method according to any one of claims 1 to 7.

Images