Air conditioner control method, device, air conditioner and storage medium

Abstract

The present invention discloses an air conditioner control method, device, air conditioner, and storage medium, belonging to the technical field of air conditioners. The present invention controls the compressor of the air conditioner to operate at a preset frequency and records the operating time of the compressor; when the operating time reaches a first lower limit, obtains the exhaust temperature of the compressor and the temperature of the heat exchanger; determines the temperature difference between the exhaust temperature and the temperature of the heat exchanger; adjusts the operating frequency of the compressor based on the temperature difference, determines the exhaust superheat of the compressor based on the difference between the exhaust temperature and the temperature of the heat exchanger, and uses the compressor exhaust superheat as a judgment condition after the minimum operating time is met. The combined judgment of the two ensures effective oil lubrication protection of the compressor while optimizing the time it takes for the air conditioner to reach stable operation from startup under different operating conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an air conditioner control method and device, an air conditioner, and a storage medium. Background Art

[0002] Currently, when air conditioning systems are started up in heating mode after being left idle for an extended period in low outdoor temperatures, especially extremely low temperatures, poor oil lubrication is a common cause of compressor sintering. This is because the compatibility of the air conditioning system's lubricant and refrigerant is negatively correlated with decreasing temperatures. As the outdoor temperature continues to drop, refrigerant in the lubricant in the outdoor unit's condenser precipitates, depositing in the outdoor unit's heat exchanger piping. When the air conditioner is started up in heating mode, the refrigerant's operating temperature in the outdoor unit's heat exchanger drops below ambient temperature, exacerbating the sintering of the refrigerant. When the refrigerant circulates back to the compressor, it only brings back a small amount of lubricant, resulting in insufficient oil lubrication and sintering.

[0003] Most of the current solutions are designed from the following aspects: preset expansion valve opening at startup, and change the expansion valve opening after forced operation for a preset time. After startup, the preset frequency is forced to run, and the frequency can be changed after the preset time is met. The preset parameters under the existing scheme are all based on a small number of samples. After forced operation of fixed parameters, the air-conditioning system can reach a certain stable oil circulation state. The preset parameters are determined by judging whether the lubricating oil level in the compressor body meets the design requirements at this time. The problem with the current solution is that due to different actual use environments, the time required for the compressor to reach the target oil lubrication conditions varies. In order to ensure reliability, the preset time of running the preset protection frequency is often too long. This results in the air conditioner taking too long from startup to reaching the target frequency under actual use conditions.

[0004] The above content is only used to assist in understanding the technical solution of the present invention and does not constitute an admission that the above content is prior art. Summary of the Invention

[0005] The main purpose of the present invention is to provide an air conditioner control method, device, air conditioner and storage medium, aiming to solve the technical problem of the prior art that the air conditioner takes a long time from startup to stable operation.

[0006] To achieve the above object, the present invention provides an air conditioner control method, which includes the following steps:

[0007] Controlling the compressor of the air conditioner to operate at a preset frequency and recording the operating time of the compressor;

[0008] When the operating time reaches a first lower limit, obtaining the exhaust temperature of the compressor and the temperature of the heat exchanger;

[0009] determining a temperature difference between the exhaust gas temperature and the temperature of the heat exchanger; and

[0010] The operating frequency of the compressor is adjusted according to the temperature difference.

[0011] Optionally, adjusting the operating frequency of the compressor according to the temperature difference includes:

[0012] When the temperature difference is greater than a preset difference threshold, the operating frequency of the compressor is increased according to a preset amplitude.

[0013] Optionally, adjusting the operating frequency of the compressor according to the temperature difference includes:

[0014] When the temperature difference is less than or equal to a preset difference threshold, controlling the compressor to continue running at the preset frequency and recording the running time; and

[0015] When the operating time reaches a first upper limit, the operating frequency of the compressor is increased according to a preset amplitude.

[0016] Optionally, after increasing the operating frequency of the compressor according to a preset amplitude, the method further includes:

[0017] comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency;

[0018] When the current operating frequency is lower than the target operating frequency, controlling the compressor to operate at the current operating frequency and recording the operating time;

[0019] When the operating time reaches a second lower limit, obtaining the exhaust temperature of the compressor and the temperature of the heat exchanger;

[0020] determining a temperature difference between the exhaust gas temperature and the heat exchanger temperature; and

[0021] The current operating frequency continues to be adjusted according to the temperature difference.

[0022] Optionally, the continuing to adjust the current operating frequency according to the temperature difference includes:

[0023] When the temperature difference is greater than the preset difference threshold, the current operating frequency is increased according to a preset amplitude, and the process returns to the step of comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency.

[0024] Optionally, the continuing to adjust the current operating frequency according to the temperature difference includes:

[0025] When the temperature difference is less than or equal to a preset difference threshold, controlling the compressor to continue operating at the current operating frequency and recording the operating time; and

[0026] When the operating time reaches the second upper limit, the current operating frequency is increased according to a preset amplitude, and the step of comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency is returned to be executed.

[0027] Optionally, after comparing the current operating frequency of the compressor after frequency upgrading with the target operating frequency, the method further includes:

[0028] When the current operating frequency is greater than the target operating frequency, the compressor is controlled to stop frequency increase, and the compressor is controlled to operate according to the target operating frequency.

[0029] In addition, to achieve the above-mentioned object, the present invention further provides an air conditioner control device, the air conditioner control device comprising:

[0030] a recording module, configured to control the compressor of the air conditioner to operate at a preset frequency and record the operating time of the compressor;

[0031] an acquisition module, configured to acquire the exhaust temperature of the compressor and the temperature of the heat exchanger when the operating time reaches a first lower limit;

[0032] a calculation module for determining a temperature difference between the exhaust gas temperature and the temperature of the heat exchanger; and

[0033] An adjustment module is used to adjust the operating frequency of the compressor according to the temperature difference.

[0034] In addition, to achieve the above-mentioned purpose, the present invention also proposes an air conditioner, which includes: a memory, a processor, and an air conditioner control program stored in the memory and running on the processor, and the air conditioner control program is configured to implement the air conditioner control method described above.

[0035] In addition, to achieve the above-mentioned purpose, the present invention further proposes a storage medium, on which an air conditioner control program is stored. When the air conditioner control program is executed by a processor, the air conditioner control method as described above is implemented.

[0036] The present invention controls the compressor of the air conditioner to operate at a preset frequency and records the operating time of the compressor; when the operating time reaches a first lower limit, obtains the exhaust temperature of the compressor and the temperature of the heat exchanger; determines the temperature difference between the exhaust temperature and the temperature of the heat exchanger; adjusts the operating frequency of the compressor according to the temperature difference, determines the exhaust superheat of the compressor by the exhaust temperature and the temperature of the heat exchanger, and after the minimum operating time is met, uses the exhaust superheat of the compressor as a judgment condition. The combined judgment of the two ensures effective oil lubrication protection of the compressor while optimizing the time from startup to stable operation of the air conditioner under different usage conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 1 is a schematic structural diagram of an air conditioner in a hardware operating environment according to an embodiment of the present invention;

[0038] Figure 2 1 is a flow chart of a first embodiment of an air conditioner control method according to the present invention;

[0039] Figure 3 This is a schematic diagram of the structure of an air conditioner in an embodiment of the air conditioner control method of the present invention;

[0040] Figure 4 1. It is a flow chart of a second embodiment of the air conditioner control method of the present invention;

[0041] Figure 5 1. It is a flow chart of a third embodiment of the air conditioner control method of the present invention;

[0042] Figure 6 FIG. 1 is a structural block diagram of a first embodiment of an air conditioner control device according to the present invention.

[0043] Description of Reference Numerals

[0044] 1 Inverter compressor 6 Refrigeration throttle valve 2 Four-way valve 7 Filter 3 Condenser 8 evaporator 31 Upper fan 81 Internal fan 32 Downwind fan 82 Indoor pipe temperature sensor 33 Outdoor pipe temperature sensor 9 Vapor-liquid separator 34 External ambient temperature sensor 10 solenoid valve 4 Filter 11 capillary 5 Heating throttle valve

[0045] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0046] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] Reference Figure 1 , Figure 1 This is a schematic diagram of the air conditioner structure of the hardware operating environment involved in the embodiment of the present invention.

[0048] like Figure 1As shown, the air conditioner may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the user interface 1003 may optionally include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (RAM) memory, or a stable non-volatile memory (NVM), such as a disk memory. The memory 1005 may optionally be a storage device independent of the aforementioned processor 1001.

[0049] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the air conditioner, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0050] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module and an air conditioner control program.

[0051] exist Figure 1 In the air conditioner shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the air conditioner of the present invention can be set in the air conditioner, and the air conditioner calls the air conditioner control program stored in the memory 1005 through the processor 1001, and executes the air conditioner control method provided by the embodiment of the present invention.

[0052] The embodiment of the present invention provides an air conditioner control method, referring to Figure 2 , Figure 2 FIG1 is a flow chart of a first embodiment of an air conditioner control method according to the present invention.

[0053] In this embodiment, the air conditioner control method includes the following steps:

[0054] Step S10: controlling the compressor of the air conditioner to operate at a preset frequency, and recording the operating time of the compressor.

[0055] In this embodiment, the execution subject of this embodiment may be the air conditioner control device, which has functions such as data processing, data communication, and program execution. The air conditioner control device may be a controller within the air conditioner. Of course, other devices with similar functions may also be used, and this implementation condition does not limit this. For ease of explanation, this embodiment uses the air conditioner control device as an example.

[0056] Currently, when air conditioning systems are started up in heating mode after being left idle for an extended period in low outdoor temperatures, especially extremely low temperatures, poor oil lubrication is a common cause of compressor sintering. This is because the compatibility of the air conditioning system's lubricant and refrigerant is negatively correlated with decreasing temperatures. As the outdoor temperature continues to drop, refrigerant in the lubricant in the outdoor unit's condenser precipitates, depositing in the outdoor unit's heat exchanger piping. When the air conditioner is started up in heating mode, the refrigerant's operating temperature in the outdoor unit's heat exchanger drops below ambient temperature, exacerbating the sintering of the refrigerant. When the refrigerant circulates back to the compressor, it only brings back a small amount of lubricant, resulting in insufficient oil lubrication and sintering.

[0057] Most of the current solutions are designed from the following aspects: preset expansion valve opening at startup, and change the expansion valve opening after forced operation for a preset time. After startup, the preset frequency is forced to run, and the frequency can be changed after the preset time is met. The preset parameters under the existing scheme are all based on a small number of samples. After forced operation of fixed parameters, the air-conditioning system can reach a certain stable oil circulation state. The preset parameters are determined by judging whether the lubricating oil level in the compressor body meets the design requirements at this time. The problem with the current solution is that due to different actual use environments, the time required for the compressor to reach the target oil lubrication conditions varies. In order to ensure reliability, the preset time of running the preset protection frequency is often too long. This results in the air conditioner taking too long from startup to reaching the target frequency under actual use conditions.

[0058] In order to solve the above technical problems, in this embodiment, the compressor exhaust superheat is introduced as a judgment condition for frequency increase. After the minimum operating time is met, the compressor exhaust superheat is used as a judgment condition to control the frequency of the compressor.

[0059] In the specific implementation, this embodiment first proposes an air conditioner structure, such as Figure 3 As shown, Figure 3The air conditioner shown in the figure includes an indoor side and an outdoor side. The indoor side includes an evaporator 8, an indoor fan 81, and an indoor pipeline temperature sensor 82. The outdoor side includes a variable-frequency compressor 1, a four-way valve 2, a condenser 3, an upper fan 31, a lower fan 32, an outdoor pipeline temperature sensor 33, an outdoor ambient temperature sensor 34, a filter 4, a heating throttle valve 5, a refrigeration throttle valve 6, a filter 7, a gas-liquid separator 9, a solenoid valve 10, and a capillary tube 11.

[0060] It should be noted that the current solution not only takes a long time for the air conditioner to reach stable operation, but there are also obvious differences in the lubrication conditions of the compressor oil for starting in the refrigeration and heating operating conditions, which are not distinguished in the current solution. However, in this embodiment, different operating conditions can be distinguished.

[0061] Specifically, when the air conditioner is in the heating operating condition, when the compressor operates at the preset frequency Hz1 for the preset time t1, the evaporator temperature T2 and the exhaust temperature T are detected 排 , when T 排 -T2 > ΔT heat, it means that the compressor has reached sufficient exhaust superheat, the lubrication effect of the compressor oil is good, and the first-stage frequency of the oil level protection ends. The compressor frequency rises by the preset value + ΔHz; when T 排 -T2 ≤ ΔT heat, the expansion valve is opened too large, the refrigerant flow rate is insufficient, and there is a risk of lubricating oil remaining in the system. The compressor continues to operate at the preset frequency Hz1 for the preset time t 1max preset, and the compressor frequency rises by the preset value ΔHz. When the target frequency > Hz1 + ΔHz, when the compressor operates at Hz1 + ΔHz for the preset time t2, when T 排 -T2 > ΔT heat, the second-stage frequency of the oil level protection ends, and the compressor frequency continues to rise by ΔHz; when T 排 -T2 ≤ ΔT heat, the compressor operates at Hz1 + ΔHz for the preset time t 2max preset, and the compressor frequency continues to rise by the preset value ΔHz. When the target frequency < Hz1 + ΔHz + ΔHz, the compressor operates at the target frequency, and the frequency no longer rises, and the oil level protection control ends. When the target frequency > Hz1 + ΔHz + ΔHz, continue to execute the compressor frequency increase step until the target frequency is reached.

[0062] In the refrigeration operating condition, when the compressor operates at the preset frequency Hz1 for the preset time t1, the condenser temperature T3 and the exhaust temperature T are detected 排 , when T 排 -T3 > ΔT cold, it means that the compressor has reached sufficient exhaust superheat, the lubrication effect of the compressor oil is good, and the first-stage frequency of the oil level protection ends. The compressor frequency rises by the preset value + ΔHz; when T 排- When ΔT cold ≤ T3, the expansion valve opens too much, the refrigerant flow rate is insufficient, and there is a risk that lubricating oil remains in the system. The compressor operates at the preset frequency Hz1 for the time t 1max After presetting, the compressor frequency rises by the preset value ΔHz. When the target frequency > Hz1 + ΔHz, when the compressor operates at Hz1 + ΔHz for the time t2 preset, when T 排 - When ΔT cold > T3, the second-stage frequency of the oil level protection ends, and the compressor frequency continues to rise by ΔHz. When T 排 - When ΔT cold ≤ T2, the compressor operates at Hz1 + ΔHz for the time t 2max After presetting, the compressor frequency continues to rise by the preset value ΔHz. When the target frequency < Hz1 + ΔHz, the compressor operates at the target frequency, the frequency no longer rises, and the oil level protection control ends. When the target frequency > Hz1 + ΔHz + ΔHz, continue to execute the compressor frequency increase step until the target frequency is reached.

[0063] In a specific implementation, after meeting the minimum running time, the compressor discharge superheat is used as a determination condition to control the frequency of the compressor. Therefore, in this embodiment, after the air conditioner is started, the running duration of the compressor is monitored in real time and recorded. After the compressor is started in this embodiment, it operates at a preset frequency, and this preset frequency can be set accordingly according to actual needs, and this embodiment does not limit this.

[0064] Step S20: When the running duration reaches the first lower limit duration, obtain the discharge temperature of the compressor and the temperature of the heat exchanger.

[0065] In a specific implementation, after obtaining the running duration of the compressor, in this embodiment, the running duration is compared with the first lower limit duration, and the first lower limit duration is also the minimum running duration that the compressor needs to meet. This duration can be set accordingly according to actual needs, and this embodiment does not limit this. After reaching the first lower limit duration, further obtain the discharge temperature of the compressor and the temperature of the heat exchanger. The discharge temperature of the compressor and the temperature of the heat exchanger are used to determine the superheat of the compressor during operation.

[0066] Step S30: Determine the temperature difference between the discharge temperature and the temperature of the heat exchanger.

[0067] It should be noted that after obtaining the discharge temperature and the temperature of the heat exchanger, in this embodiment, the superheat of the compressor is determined by calculating the temperature difference between the discharge temperature and the temperature of the heat exchanger. For example, assume the discharge temperature is T 排 , the temperature of the heat exchanger is T2, compare T 排 - T2 with ΔT heat. If T 排-T2>△Thot, indicating that the compressor has achieved sufficient exhaust superheat.

[0068] Step S40: adjusting the operating frequency of the compressor according to the temperature difference.

[0069] In a specific implementation, based on the temperature difference, it can be judged whether the compressor oil lubrication effect is good or there is a risk of lubricating oil remaining in the system, and then the operating frequency of the compressor is adjusted based on this. The adjustment of the compression operating frequency in this embodiment is not limited to increasing the operating frequency of the compressor.

[0070] This embodiment controls the compressor of the air conditioner to operate at a preset frequency and records the operating time of the compressor; when the operating time reaches a first lower limit, obtains the exhaust temperature of the compressor and the temperature of the heat exchanger; determines the temperature difference between the exhaust temperature and the temperature of the heat exchanger; adjusts the operating frequency of the compressor according to the temperature difference, determines the exhaust superheat of the compressor by the exhaust temperature and the temperature of the heat exchanger, and uses the compressor exhaust superheat as a judgment condition after the minimum operating time is met. The combined judgment of the two ensures effective oil lubrication protection of the compressor while optimizing the time it takes for the air conditioner to reach stable operation from startup under different usage conditions.

[0071] refer to Figure 4 , Figure 4 FIG. 1 is a flow chart of a second embodiment of an air conditioner control method according to the present invention.

[0072] Based on the first embodiment, in the air conditioner control method of this embodiment, step S40 specifically includes:

[0073] Step S401: when the temperature difference is greater than a preset difference threshold, increasing the operating frequency of the compressor according to a preset amplitude.

[0074] It should be noted that, in this embodiment, corresponding control can be performed for the cooling condition and the heating condition respectively, and the heating condition will be taken as an example for description.

[0075] Under the heating condition, when the temperature difference is greater than the preset difference threshold, it means that the compressor has reached a sufficient exhaust superheat and the compressor oil lubrication effect is good. In this case, in this embodiment, the operating frequency of the compressor is increased according to the preset amplitude. In this embodiment, the preset difference threshold under the heating condition is △Theat, and the preset amplitude is △Hz. That is, when the temperature difference is greater than △Theat, the operating frequency of the compressor is increased by △Hz. The preset difference threshold and the preset amplitude can be set accordingly according to actual needs, and there is no restriction on this in this embodiment.

[0076] Furthermore, if the temperature difference is less than or equal to the preset difference threshold, the expansion valve is opened too much, the refrigerant flow rate is insufficient, and there is a risk of lubricating oil remaining in the system. In this case, the present embodiment continues to control the compressor to continue to operate at the preset frequency initially set, while recording the operating time. After reaching a certain operating time, that is, when the first upper limit time is reached, the operating frequency of the compressor is increased according to the preset amplitude. Among them, the first upper limit time is greater than the first lower limit time, and can be set according to actual needs. This is not limited in the present embodiment. For example, the compressor is controlled to continue to operate at the preset frequency f0. When the operating time reaches the first upper limit time t 1max When the compressor is running at high speed, the frequency of the compressor will be increased.

[0077] It should be noted that the process under cooling conditions is similar to the above process, the difference being that under cooling conditions, the temperature difference is compared with a preset difference threshold ΔTcold, and ΔThot is greater than ΔTcold.

[0078] This embodiment uses the superheat of the compressor as a judgment condition for the compressor frequency increase. While ensuring effective oil lubrication protection of the compressor, it optimizes the time it takes for the air conditioner to reach stable operation from startup under different usage conditions. By distinguishing between different practical conditions during cooling and heating, the oil lubrication protection of the compressor is implemented more scientifically.

[0079] refer to Figure 5 , Figure 5 FIG. 4 is a flow chart of a third embodiment of an air conditioner control method according to the present invention.

[0080] Based on the above second embodiment, a third embodiment of an air conditioner control method of the present invention is proposed. In this embodiment, after step S401, the method further includes:

[0081] Step S402: Compare the current operating frequency of the compressor after frequency upgrading with the target operating frequency.

[0082] After the compressor is up-converted, this embodiment further obtains the current operating frequency of the up-converted compressor and then compares this operating frequency with the target operating frequency. Specifically, if the current operating frequency of the up-converted compressor is greater than the target operating frequency, this embodiment stops up-converting the compressor and controls the compressor to operate at the target operating frequency. For example, if the current operating frequency of the up-converted compressor is fr+△Hz and the target operating frequency is f0, when fr+△Hz>f0, the up-converting is stopped and the compressor is controlled to operate at the target operating frequency f0.

[0083] Step S403: When the current operating frequency is lower than the target operating frequency, the compressor is controlled to operate according to the current operating frequency, and the operating time is recorded.

[0084] In a specific implementation, if the current operating frequency of the compressor after frequency conversion is lower than the target operating frequency, in this embodiment, the current operating frequency of the compressor needs to be further increased. Before continuing the frequency conversion, in this embodiment, the compressor needs to be controlled to continue operating at the current operating frequency after frequency conversion, and the operating time is recorded. For example, if the current operating frequency of the compressor after frequency conversion is fr+△Hz and the target operating frequency is f0, when fr+△Hz<f0, the compressor will continue to be controlled to operate at fr+△Hz.

[0085] Step S404: When the operating time reaches a second lower limit, the exhaust temperature of the compressor and the temperature of the heat exchanger are obtained.

[0086] It should be noted that after the running time reaches the second lower limit, the judgment of the exhaust superheat of the compressor is performed. For example, the compressor is controlled to run according to fr+△Hz. When the running time reaches t 2min , and then obtain the exhaust temperature of the compressor and the temperature of the heat exchanger, wherein the second lower limit time length is less than the first lower limit time length.

[0087] Step S405: Determine the temperature difference between the exhaust gas temperature and the temperature of the heat exchanger.

[0088] Step S406: Continue adjusting the current operating frequency according to the temperature difference.

[0089] In a specific implementation, if the temperature difference is greater than the preset difference threshold, the compressor is directly frequency-upgraded according to the preset amplitude, for example, the current operating frequency of the compressor after frequency upgradation is increased from fr+△Hz to fr+△Hz+△Hz. On the contrary, if the temperature difference is less than or equal to the preset difference threshold, then in this embodiment, the compressor is continued to be controlled to continue to operate at the current operating frequency after frequency upgradation, while recording the operating time. After reaching a certain operating time, that is, when the second upper limit time is reached, the operating frequency of the compressor is increased according to the preset amplitude, wherein the second upper limit time is greater than the second lower limit time, and can be set according to actual needs. This is not limited in this embodiment. For example, the compressor is controlled to continue to operate at the preset frequency fr+△Hz. When the operating time reaches the second upper limit time t 2max When the frequency of the compressor is increased, the current operating frequency is increased from fr+△Hz to fr+△Hz+△Hz.

[0090] Furthermore, after completing the secondary frequency up-conversion, in this embodiment, the current operating frequency of the compressor after the secondary frequency up-conversion continues to be compared with the target operating frequency, and based on the comparison result, the above-mentioned method is continued to be executed, and so on. For example, after the current operating frequency of the compressor after the frequency up-conversion is increased from fr+△Hz to fr+△Hz+△Hz, in this embodiment, fr+△Hz+△Hz is compared with the target operating frequency f0. If fr+△Hz+△Hz is greater than f0, the frequency up-conversion is stopped and the compressor operation is controlled according to the target operating frequency f0. If it is less than f0, the frequency up-conversion is continued and fr+△Hz+△Hz is increased to fr+△Hz+△Hz+△Hz. In this embodiment, the compressor frequency control logic under cooling and heating conditions is similar, and both can adopt the method described in this embodiment.

[0091] This embodiment compares the operating frequency of the compressor with the target frequency and accurately controls the compressor frequency based on the comparison result, so that the compressor oil lubrication protection time during the startup phase of the compressor can be changed accordingly according to different usage conditions, allowing the air conditioner to achieve stable operation more quickly.

[0092] In addition, an embodiment of the present invention further provides a storage medium on which an air conditioner control program is stored. When the air conditioner control program is executed by a processor, the steps of the air conditioner control method described above are implemented.

[0093] Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0094] Reference Figure 6 , Figure 6 FIG. 1 is a structural block diagram of a first embodiment of an air conditioner control device according to the present invention.

[0095] like Figure 6 As shown, the air conditioner control device proposed in the embodiment of the present invention includes:

[0096] The recording module 10 is used to control the compressor of the air conditioner to operate at a preset frequency and record the operating time of the compressor.

[0097] In this embodiment, the execution subject of this embodiment may be the air conditioner control device, which has functions such as data processing, data communication, and program execution. The air conditioner control device may be a controller within the air conditioner. Of course, other devices with similar functions may also be used, and this implementation condition does not limit this. For ease of explanation, this embodiment uses the air conditioner control device as an example.

[0098] Currently, when air conditioning systems are started up in heating mode after being left idle for an extended period in low outdoor temperatures, especially extremely low temperatures, poor oil lubrication is a common cause of compressor sintering. This is because the compatibility of the air conditioning system's lubricant and refrigerant is negatively correlated with decreasing temperatures. As the outdoor temperature continues to drop, refrigerant in the lubricant in the outdoor unit's condenser precipitates, depositing in the outdoor unit's heat exchanger piping. When the air conditioner is started up in heating mode, the refrigerant's operating temperature in the outdoor unit's heat exchanger drops below ambient temperature, exacerbating the sintering of the refrigerant. When the refrigerant circulates back to the compressor, it only brings back a small amount of lubricant, resulting in insufficient oil lubrication and sintering.

[0099] Most of the current solutions are designed from the following aspects: preset expansion valve opening at startup, and change the expansion valve opening after forced operation for a preset time. After startup, the preset frequency is forced to run, and the frequency can be changed after the preset time is met. The preset parameters under the existing scheme are all based on a small number of samples. After forced operation of fixed parameters, the air-conditioning system can reach a certain stable oil circulation state. The preset parameters are determined by judging whether the lubricating oil level in the compressor body meets the design requirements at this time. The problem with the current solution is that due to different actual use environments, the time required for the compressor to reach the target oil lubrication conditions varies. In order to ensure reliability, the preset time of running the preset protection frequency is often too long. This results in the air conditioner taking too long from startup to reaching the target frequency under actual use conditions.

[0100] In order to solve the above technical problems, in this embodiment, the compressor exhaust superheat is introduced as a judgment condition for frequency increase. After the minimum operating time is met, the compressor exhaust superheat is used as a judgment condition to control the frequency of the compressor.

[0101] In the specific implementation, this embodiment first proposes an air conditioner structure, such as Figure 3 As shown, Figure 3 The air conditioner shown in the figure includes an indoor side and an outdoor side. The indoor side includes an evaporator 8, an indoor fan 81 and an indoor pipe temperature sensor 82. The outdoor side includes a variable frequency compressor 1, a four-way valve 2, a condenser 3, an upper fan 31, a lower fan 32, an outdoor pipe temperature sensor 33, an external ambient temperature sensor 34, a filter 4, a heating throttle valve 5, a cooling throttle valve 6, a filter 7, a vapor-liquid separator 9, a solenoid valve 10 and a capillary tube 11.

[0102] It should be noted that the current solution not only takes a long time for the air conditioner to achieve stable operation, but also has obvious differences in the compressor oil lubrication conditions for starting cooling and heating conditions. The current solution does not distinguish between them, but this embodiment can distinguish between different working conditions.

[0103] Specifically, when the air conditioner is in the heating mode, when the compressor operates at the preset frequency Hz1 for the preset time t1, the evaporator temperature T2 and the exhaust temperature T are detected 排 , when T 排 - T2 > ΔT heat, it indicates that the compressor has reached a sufficient exhaust superheat degree, the lubrication effect of the compressor oil is good, and the first-stage frequency of the oil level protection ends. The compressor frequency rises by the preset value + ΔHz; when T 排 - T2 ≤ ΔT heat, the expansion valve opens too much, the refrigerant flow rate is insufficient, and there is a risk of lubricating oil remaining in the system. The compressor continues to operate at the preset frequency Hz1 for the preset time t 1max preset, and then the compressor frequency rises by the preset value ΔHz. When the target frequency > Hz1 + ΔHz, when the compressor operates at Hz1 + ΔHz for the preset time t2, when T 排 - T2 > ΔT heat, the second-stage frequency of the oil level protection ends, and the compressor frequency continues to rise by ΔHz; when T 排 - T2 ≤ ΔT heat, after the compressor operates at Hz1 + ΔHz for the preset time t 2max preset, the compressor frequency continues to rise by the preset value ΔHz. When the target frequency < Hz1 + ΔHz, the compressor operates at the target frequency and the frequency no longer rises, and the oil level protection control ends. When the target frequency > Hz1 + ΔHz + ΔHz, continue to execute the compressor frequency increase step until the target frequency is reached.

[0104] In the cooling mode, when the compressor operates at the preset frequency Hz1 for the preset time t1, the condenser temperature T3 and the exhaust temperature T are detected 排 , when T 排 - T3 > ΔT cold, it indicates that the compressor has reached a sufficient exhaust superheat degree, the lubrication effect of the compressor oil is good, and the first-stage frequency of the oil level protection ends. The compressor frequency rises by the preset value + ΔHz; when T 排 - T3 ≤ ΔT cold, the expansion valve opens too much, the refrigerant flow rate is insufficient, and there is a risk of lubricating oil remaining in the system. The compressor operates at the preset frequency Hz1 for the preset time t 1max preset, and then the compressor frequency rises by the preset value ΔHz. When the target frequency > Hz1 + ΔHz, when the compressor operates at Hz1 + ΔHz for the preset time t2 (because the oil lubrication condition is good at startup, t1 preset > t2 preset), when T 排 - T3 > ΔT cold, the second-stage frequency of the oil level protection ends, and the compressor frequency continues to rise by ΔHz. When T 排 - T2 ≤ ΔT cold, the compressor operates at Hz1 + ΔHz for the preset time t 2maxAfter the preset, the compressor frequency continues to rise by a preset value △Hz. When the target frequency < Hz1 + △Hz, the compressor operates at the target frequency, and the frequency no longer rises, and the oil level protection control ends. When the target frequency > Hz1 + △Hz + △Hz, the compressor frequency increase step is continued until the target frequency is reached.

[0105] In a specific implementation, after meeting the minimum running time, the compressor discharge superheat degree is used as a determination condition to control the frequency of the compressor. Therefore, in this embodiment, after the air conditioner is started, the running duration of the compressor is monitored in real time and recorded. After the compressor is started in this embodiment, it operates at a preset frequency, and the preset frequency can be set accordingly according to actual requirements, and this embodiment does not limit this.

[0106] An acquisition module 20, configured to acquire the discharge temperature of the compressor and the temperature of the heat exchanger when the running duration reaches a first lower limit duration.

[0107] In a specific implementation, after obtaining the running duration of the compressor, in this embodiment, the running duration is compared with a first lower limit duration, and the first lower limit duration is also the minimum running duration that the compressor needs to meet, and this duration can be set accordingly according to actual requirements, and this embodiment does not limit this. After reaching the first lower limit duration, the discharge temperature of the compressor and the temperature of the heat exchanger are further acquired, and the discharge temperature of the compressor and the temperature of the heat exchanger are used to determine the heat degree during the operation of the compressor.

[0108] A calculation module 30, configured to determine the temperature difference between the discharge temperature and the temperature of the heat exchanger.

[0109] It should be noted that after obtaining the discharge temperature and the temperature of the heat exchanger, in this embodiment, the superheat degree of the compressor is determined by calculating the temperature difference between the discharge temperature and the temperature of the heat exchanger. For example, assume the discharge temperature is T 排 , the temperature of the heat exchanger is T2, compare T 排 - T2 with △T heat. If T 排 - T2 > △T heat, it means that the compressor reaches a sufficient discharge superheat degree.

[0110] An adjustment module 40, configured to adjust the operating frequency of the compressor according to the temperature difference.

[0111] In a specific implementation, based on the temperature difference, it can be judged whether the oil lubrication effect of the compressor is good or there is a risk of lubricating oil remaining in the system, and then based on this, the operating frequency of the compressor is adjusted. The adjustment of the compression operating frequency in this embodiment is not limited to increasing the operating frequency of the compressor.

[0112] This embodiment controls the compressor of the air conditioner to operate at a preset frequency and records the operating time of the compressor; when the operating time reaches a first lower limit, obtains the exhaust temperature of the compressor and the temperature of the heat exchanger; determines the temperature difference between the exhaust temperature and the temperature of the heat exchanger; adjusts the operating frequency of the compressor according to the temperature difference, determines the exhaust superheat of the compressor by the exhaust temperature and the temperature of the heat exchanger, and uses the compressor exhaust superheat as a judgment condition after the minimum operating time is met. The combined judgment of the two ensures effective oil lubrication protection of the compressor while optimizing the time it takes for the air conditioner to reach stable operation from startup under different usage conditions.

[0113] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can make settings as needed, and the present invention does not impose any limitation on this.

[0114] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of it according to actual needs to achieve the purpose of the embodiment scheme, and no limitation is made here.

[0115] In addition, for technical details not fully described in this embodiment, reference can be made to the air conditioner control method provided in any embodiment of the present invention, and will not be repeated here.

[0116] In addition, it should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0117] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0118] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, or of course by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0119] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for controlling an air conditioner, characterized in that: The air conditioner control method includes: Controlling the compressor of the air conditioner to operate at a preset frequency and recording the operating time of the compressor; When the operating time reaches a first lower limit, obtaining the exhaust temperature of the compressor and the temperature of the heat exchanger; determining a temperature difference between the exhaust gas temperature and the temperature of the heat exchanger; and adjusting the operating frequency of the compressor according to the temperature difference; The adjusting the operating frequency of the compressor according to the temperature difference includes: When the temperature difference is greater than a preset difference threshold, increasing the operating frequency of the compressor according to a preset amplitude; When the temperature difference is less than or equal to a preset difference threshold, controlling the compressor to continue running at the preset frequency and recording the running time; and When the operating time reaches a first upper limit, increasing the operating frequency of the compressor according to a preset amplitude; comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency; When the current operating frequency is lower than the target operating frequency, controlling the compressor to operate at the current operating frequency and recording the operating time; When the operating time reaches a second lower limit, obtaining the exhaust temperature of the compressor and the temperature of the heat exchanger; determining a temperature difference between the exhaust gas temperature and the heat exchanger temperature; and The current operating frequency continues to be adjusted according to the temperature difference.

2. The air conditioner control method according to claim 1, wherein: The step of continuing to adjust the current operating frequency according to the temperature difference includes: When the temperature difference is greater than the preset difference threshold, the current operating frequency is increased according to a preset amplitude, and the process returns to the step of comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency.

3. The air conditioner control method according to claim 1, wherein: The step of continuing to adjust the current operating frequency according to the temperature difference includes: When the temperature difference is less than or equal to a preset difference threshold, controlling the compressor to continue operating at the current operating frequency and recording the operating time; and When the operating time reaches the second upper limit, the current operating frequency is increased according to a preset amplitude, and the step of comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency is returned to be executed.

4. The air conditioner control method according to claim 1, wherein: After comparing the current operating frequency of the compressor after frequency increase with the target operating frequency, the method further includes: When the current operating frequency is greater than the target operating frequency, the compressor is controlled to stop frequency increase, and the compressor is controlled to operate according to the target operating frequency.

5. An air conditioner control device, characterized in that: The air conditioner control device comprises: a recording module, configured to control the compressor of the air conditioner to operate at a preset frequency and record the operating time of the compressor; an acquisition module, configured to acquire the exhaust temperature of the compressor and the temperature of the heat exchanger when the operating time reaches a first lower limit; a calculation module for determining a temperature difference between the exhaust gas temperature and the temperature of the heat exchanger; and an adjustment module, configured to adjust the operating frequency of the compressor according to the temperature difference; The adjustment module is further configured to increase the operating frequency of the compressor according to a preset amplitude when the temperature difference is greater than a preset difference threshold; The adjustment module is further configured to control the compressor to continue operating at the preset frequency and record the operating time when the temperature difference is less than or equal to a preset difference threshold; and When the operating time reaches a first upper limit, increasing the operating frequency of the compressor according to a preset amplitude; comparing the current operating frequency of the compressor after the frequency increase with the target operating frequency; When the current operating frequency is lower than the target operating frequency, controlling the compressor to operate at the current operating frequency and recording the operating time; When the operating time reaches a second lower limit, obtaining the exhaust temperature of the compressor and the temperature of the heat exchanger; determining a temperature difference between the exhaust gas temperature and the heat exchanger temperature; and The current operating frequency continues to be adjusted according to the temperature difference.

6. An air conditioner, characterized in that: The air conditioner includes a memory, a processor, and an air conditioner control program stored in the memory and running on the processor, wherein the air conditioner control program is configured to implement the air conditioner control method according to any one of claims 1 to 4.

7. A storage medium, characterized in that: The storage medium stores an air conditioner control program, and when the air conditioner control program is executed by the processor, the air conditioner control method according to any one of claims 1 to 4 is implemented.

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