Control method and device of solar air conditioner and solar air conditioning system

Abstract

This invention relates to the field of air conditioning technology, and provides a control method, device, and solar air conditioning system for a solar-powered air conditioner. The method includes: when the solar-powered air conditioner is in operation mode powered by a solar power module, acquiring the current operating frequency of the compressor and the current ambient temperature; determining, based on the current operating frequency and ambient temperature, that a low-frequency oil return trigger condition is met; responding to the low-frequency oil return trigger condition, executing an oil return control operation, which includes controlling the compressor to increase its operating frequency from the current frequency to a target frequency; and activating an auxiliary power supply unit to provide compensating power to the compressor. By determining that the low-frequency oil return trigger condition is met based on the compressor's current operating frequency and ambient temperature, when executing oil return control, the compressor is increased to a target frequency lower than the standard oil return frequency, improving user comfort during the air conditioner's oil return process; simultaneously, the auxiliary power supply unit is activated to provide compensating power, ensuring the reliability of the compressor's oil return process.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a control method, device, and solar air conditioning system for a solar air conditioner. Background Technology

[0002] With the continuous development of new energy technologies, solar energy, as a clean and renewable energy source, has been gradually applied to household appliances such as air conditioners. Solar air conditioners convert solar energy into electrical energy through photovoltaic modules, providing some or all of the power required for the air conditioner's operation, offering advantages such as energy saving and environmental protection. Especially under operating conditions with relatively low ambient temperatures (such as below 35℃), the heat load of the air conditioner is relatively small, and the solar power generation is sufficient to support the normal operation of the entire air conditioner, thus achieving an operation mode that relies entirely on solar power.

[0003] During air conditioner operation, the compressor's lubricating oil is circulated and discharged along with the refrigerant. To ensure the compressor's long-term stable and reliable operation, the lubricating oil is returned to the compressor through a refrigeration cycle. However, the existing lubricating oil return process can easily cause fluctuations in indoor ambient temperature, affecting user comfort. Summary of the Invention

[0004] This invention provides a control method, device, and solar air conditioning system for a solar air conditioner, which solves the problem that the return process of lubricating oil in the prior art can easily cause indoor temperature fluctuations, and achieves the goal of maintaining a stable indoor temperature while ensuring the reliability of compressor oil return.

[0005] This invention provides a control method for a solar-powered air conditioner, the solar-powered air conditioner including a compressor, a solar power supply module connected to the compressor, and an auxiliary power supply unit, the method including: When the solar air conditioner is in operation mode powered by the solar power module, the current operating frequency of the compressor and the current ambient temperature are obtained; Based on the current operating frequency and the current ambient temperature, it is determined that the low-frequency oil return trigger condition is met. In response to the low-frequency oil return trigger condition, an oil return control operation is performed, which includes: controlling the compressor to increase from the current operating frequency to a target frequency; and activating the auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

[0006] According to a control method for a solar-powered air conditioner provided by the present invention, the step of determining whether a low-frequency oil return trigger condition is met based on the current operating frequency and the current ambient temperature includes: If the current ambient temperature is lower than the first temperature threshold and the current operating frequency is lower than the first frequency threshold for a first preset duration, it is determined that the low-frequency oil return trigger condition is met.

[0007] According to a control method for a solar-powered air conditioner provided by the present invention, the step of activating the auxiliary power supply unit to provide compensating power to the compressor includes: Determine the target drive torque required for the compressor to operate at the target frequency; Determine the maximum output torque of the solar power module under the current operating conditions; Determine the torque difference between the target driving torque and the maximum output torque; The auxiliary power supply unit is controlled to output compensation power corresponding to the torque difference to the compressor.

[0008] According to a control method for a solar-powered air conditioner provided by the present invention, the oil return control operation further includes: Increase the speed of the outdoor fan.

[0009] According to a control method for a solar-powered air conditioner provided by the present invention, increasing the speed of the outdoor fan includes: Based on the power value of the compensation power output by the auxiliary power supply unit, the outdoor fan speed is controlled to increase; wherein, the power value of the compensation power is positively correlated with the target speed of the outdoor fan after it is increased.

[0010] According to a control method for a solar-powered air conditioner provided by the present invention, the oil return control operation further includes: Reduce the indoor fan speed and / or adjust the opening of the electronic expansion valve.

[0011] According to a control method for a solar-powered air conditioner provided by the present invention, the method for determining the target frequency includes: Based on the preset mapping relationship between ambient temperature and oil return frequency, the oil return frequency corresponding to the current ambient temperature is determined as the target frequency; In the mapping relationship, the oil return frequency corresponding to a lower ambient temperature is higher than the oil return frequency corresponding to a higher ambient temperature.

[0012] According to a control method for a solar-powered air conditioner provided by the present invention, after responding to the low-frequency oil return trigger condition, the method further includes: Obtain the current fluctuation amplitude of the compressor; If the current fluctuation amplitude is less than a preset stability threshold and continues for a second preset duration, the oil return control operation is terminated.

[0013] The present invention also provides a control device for a solar air conditioner, the solar air conditioner including a compressor, a solar power supply module connected to the compressor, and an auxiliary power supply unit, the device including: The acquisition module is used to acquire the current operating frequency of the compressor and the current ambient temperature when the solar air conditioner is in the operating mode powered by the solar power module; The judgment module is used to determine whether the low-frequency oil return trigger condition is met based on the current operating frequency and the current ambient temperature. An execution module is configured to perform an oil return control operation in response to the low-frequency oil return trigger condition. The oil return control operation includes: controlling the compressor to increase from the current operating frequency to a target frequency; and activating the auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

[0014] The present invention also provides a solar-powered air conditioner, comprising: compressor; Solar power module; Auxiliary power supply unit; The controller is configured to perform the control method for the solar air conditioner as described in any of the above.

[0015] The control method for a solar-powered air conditioner provided by this invention determines whether the low-frequency oil return trigger condition is met based on the compressor's current operating frequency and ambient temperature when the solar-powered air conditioner is in solar-powered operation mode. During oil return control, the compressor is raised to a target frequency lower than the standard oil return frequency, which can reduce indoor temperature fluctuations caused by oil return operation, thereby improving the user's comfort experience during the air conditioner's oil return process. At the same time, the auxiliary power supply unit is activated to provide compensation power, which can ensure that the compressor obtains sufficient driving torque at the target frequency to complete the effective oil return action, thereby maintaining a stable indoor temperature while ensuring the reliability of compressor oil return. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is one of the flowcharts illustrating the control method for a solar-powered air conditioner provided by the present invention.

[0018] Figure 2This is the second flowchart illustrating the control method for the solar air conditioner provided by this invention.

[0019] Figure 3 This is a schematic diagram of the control device for the solar air conditioner provided by the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] The following is combined with Figures 1 to 3 The control method of the solar air conditioner of the present invention is described.

[0023] An embodiment of the first aspect of the present invention provides a control method for a solar-powered air conditioner, such as... Figure 1 As shown, the method includes the following steps: Step 100: When the solar air conditioner is in operation mode powered by the solar power module, obtain the current operating frequency of the compressor and the current ambient temperature.

[0024] The solar-powered air conditioner includes an air conditioner body, a solar power supply module, and an auxiliary power supply unit. The solar power supply module and the auxiliary power supply unit are respectively connected to the air conditioner body and are used to provide working power to the air conditioner body. The air conditioner body includes a compressor, and the solar power supply module and the auxiliary power supply unit are respectively connected to the compressor.

[0025] The operation mode of a solar-powered air conditioner, powered by a solar power module, can be as follows: In cooling mode, when the outdoor ambient temperature is in the low to medium range (typically not exceeding 35°C, for example, between 20°C and 35°C), the building's heat load is low, the cooling capacity required by the air conditioner is reduced, and the compressor's operating power is correspondingly lower. Simultaneously, under suitable sunlight conditions, the photovoltaic modules of the solar power module operate at optimal efficiency, and their output power is sufficient to meet the overall operating power consumption of the air conditioner under the current low to medium load. Therefore, under the combined effect of this ambient temperature and sunlight conditions, the solar power module can independently provide the electrical energy required for the air conditioner's operation.

[0026] Step 200: Based on the current operating frequency and current ambient temperature, determine whether the low-frequency oil return trigger condition is met.

[0027] Understandably, when the solar air conditioner is in operation mode powered by the solar power module, it obtains the compressor's current operating frequency and the current ambient temperature in real time to determine whether the low-frequency oil return trigger condition is met.

[0028] For example, by comparing whether the compressor's current operating frequency is lower than a preset first frequency threshold and whether the current ambient temperature is lower than a preset first temperature threshold, if both conditions are met, it is determined that the low-frequency oil return trigger condition has been entered. This low-frequency oil return trigger condition is used to identify the operating state of the compressor, which is characterized by poor lubricating oil return and difficulty in oil return due to prolonged low-frequency operation, when the solar power module is the power source and the air conditioner body is under low heat load.

[0029] Step 300: In response to the low-frequency return oil trigger condition, perform the return oil control operation.

[0030] The oil return control operation includes: controlling the compressor to increase from the current operating frequency to the target frequency; and starting the auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than the preset standard oil return frequency.

[0031] Understandably, after determining that the low-frequency oil return trigger condition is met, the corresponding oil return control operation is executed. The oil return control operation first controls the compressor to increase its operating frequency from the current frequency to a target frequency. This target frequency is lower than the standard oil return frequency set for oil return in conventional air conditioning systems, used to reduce sudden changes in cooling capacity caused by the frequency jump. Simultaneously, the auxiliary power supply unit is activated to provide additional compensating power to the compressor. This compensates for the drive torque shortfall caused by the limited output power of the solar power module under current sunlight, which cannot independently support the compressor's stable operation at the target frequency. This ensures that the oil return process is completed effectively and smoothly.

[0032] It should be noted that existing solar power modules typically address oil return requirements by directly increasing the compressor to a higher fixed frequency (standard oil return frequency) or by forcibly increasing the frequency using solar power. This approach is prone to insufficient oil return due to insufficient driving torque when the solar power module output is limited. Forcibly increasing the frequency can also cause indoor temperature fluctuations, affecting comfort. This invention uses a collaborative control method that determines the oil return trigger condition based on ambient temperature and operating frequency. After triggering, it controls the compressor to operate at a target frequency lower than the standard oil return frequency, while simultaneously activating the auxiliary power supply unit to compensate for torque shortfalls. This reduces interference with indoor temperature stability while ensuring effective oil return, and overcomes the limitations of insufficient solar power through auxiliary power compensation. Therefore, it improves the operational reliability and energy efficiency of the solar air conditioner while maintaining user comfort.

[0033] The control method for a solar-powered air conditioner provided in this invention determines whether the low-frequency oil return trigger condition is met based on the compressor's current operating frequency and ambient temperature when the solar-powered air conditioner is in solar-powered operation mode. During oil return control, the compressor is raised to a target frequency lower than the standard oil return frequency, which reduces indoor temperature fluctuations caused by the oil return operation, thereby improving user comfort during the air conditioner's oil return process. Simultaneously, the auxiliary power supply unit is activated to provide compensation power, ensuring that the compressor obtains sufficient driving torque at the target frequency to complete the effective oil return action, thus maintaining stable indoor temperature while ensuring the reliability of compressor oil return.

[0034] In one embodiment of the present invention, step 200, determining whether the low-frequency oil return triggering condition is met based on the current operating frequency and the current ambient temperature, may specifically include the following: If the current ambient temperature is lower than the first temperature threshold and the current operating frequency is lower than the first frequency threshold for a continuous first preset duration, it is determined that the low-frequency oil return trigger condition is met.

[0035] Understandably, when the current ambient temperature is detected to be lower than the preset first temperature threshold, and the compressor operating frequency is continuously lower than the preset first frequency threshold, and this state is maintained for a first preset duration, it is determined that the low-frequency oil return trigger condition is met. This can identify the working scenario where the compressor is in a low-frequency operating state for a long time under the power of the solar power module, resulting in a decrease in lubricating oil return efficiency and difficulty in oil return, and provide a basis for judgment for subsequent oil return control operations.

[0036] It should be noted that the setting of the first frequency threshold is mainly based on the critical frequency at which the compressor may experience poor oil return under long-term low-frequency operation, and can be comprehensively determined by combining the compressor model, lubricating oil characteristics, and pipeline design. The setting of the first temperature threshold is related to the upper limit of outdoor temperature at which the solar power module can independently support the operation of the air conditioner under sunlight conditions, and is optimized by combining local climate data, photovoltaic module efficiency, and air conditioning load characteristics. In this embodiment, the first frequency threshold is 30 Hz, the first temperature threshold is 35 degrees Celsius, and the first preset duration is 6 hours.

[0037] It should be noted that when the ambient temperature is greater than or equal to the first temperature threshold, the air conditioner typically operates under a high heat load. Under this condition, the compressor operates at a higher frequency due to increased cooling demand. The lubricating oil maintains good circulation with the high-speed flowing refrigerant, preventing accumulation in the pipes and thus avoiding triggering the low-frequency oil return trigger condition based on low-frequency operation. Simultaneously, higher ambient temperatures are usually accompanied by more abundant sunlight, correspondingly enhancing the output capacity of the solar power module. This provides sufficient driving torque to the compressor, further reducing the risk of oil return difficulties due to insufficient solar power.

[0038] In one embodiment of the present invention, step 300, the method for determining the target frequency may include the following: Based on the preset mapping relationship between ambient temperature and oil return frequency, the oil return frequency corresponding to the current ambient temperature is determined as the target frequency.

[0039] In the mapping relationship, the oil return frequency corresponding to lower ambient temperatures is higher than that corresponding to higher ambient temperatures.

[0040] Understandably, the target frequency is determined by querying a preset mapping relationship between ambient temperature and oil return frequency. Based on the real-time collected ambient temperature, the corresponding oil return frequency is matched from this mapping relationship and set as the target frequency for this oil return control. In this mapping relationship, the oil return frequency value corresponding to each ambient temperature is pre-calibrated. The lower the ambient temperature, the higher the oil return frequency; that is, lower ambient temperatures correspond to higher oil return frequencies, and higher ambient temperatures correspond to lower oil return frequencies. This balances the oil return effect and operational stability under different environmental conditions.

[0041] In this embodiment, the standard oil return frequency is 40Hz. The control module of the solar air conditioner has a pre-stored lookup table that defines the mapping relationship between ambient temperature and oil return frequency. Specific data is shown in Table 1 below.

[0042] Table 1

[0043] For example, the solar-powered air conditioner is operating in cooling mode and is powered by a solar power module. The current ambient temperature is 28°C, and the compressor is currently operating at 25Hz, a state it has maintained for 7 hours. At this point, the current ambient temperature of 28°C is below the first temperature threshold (35°C), and the operating frequency of 25Hz is below the first frequency threshold (30Hz), and this has continued for more than the first preset duration (6 hours), thus meeting the low-frequency oil return trigger condition. Referring to the mapping table, the current ambient temperature of 28°C falls within the temperature range [25, 30), corresponding to an oil return frequency of 33Hz. Therefore, the compressor frequency is increased from 25Hz to 33Hz, and the auxiliary power supply unit is simultaneously activated to provide compensation power. Thus, at lower ambient temperatures (28°C), a relatively higher oil return frequency (33Hz) can generate a stronger refrigerant flow rate, thereby more effectively promoting lubricant return; while at higher ambient temperatures (e.g., 33°C), a lower target frequency (30Hz) is used to minimize disturbance to the indoor temperature, achieving a balance between oil return effect and user comfort.

[0044] In one embodiment of the present invention, such as Figure 2 As shown, in step 300, starting the auxiliary power supply unit to provide compensating power to the compressor may include the following steps: Step 310: Determine the target drive torque required for the compressor to operate at the target frequency.

[0045] Step 320: Determine the maximum output torque of the solar power module under the current operating conditions.

[0046] Step 330: Determine the torque difference between the target driving torque and the maximum output torque.

[0047] Step 340: Control the auxiliary power supply unit to output compensation power corresponding to the torque difference to the compressor.

[0048] Understandably, the calculation involves determining the target drive torque required for the compressor to operate at the target frequency; evaluating the maximum output torque that the solar power module can continuously provide under the current operating conditions based on real-time parameters such as current light intensity and photovoltaic module operating temperature; comparing the two torque values ​​to calculate the difference between the target drive torque and the maximum output torque of the solar power module, which represents the torque gap caused by insufficient solar power supply; and based on this torque difference, controlling the auxiliary power supply unit (such as mains power or energy storage battery system) to output a compensation current of appropriate magnitude and phase to provide the compressor with compensation power to make up for the torque gap, ensuring that the compressor obtains sufficient and stable drive torque at the target frequency to complete effective oil return.

[0049] For example, under a certain operating condition, the target frequency is determined to be 30Hz, and the target drive torque required for the compressor to operate stably at this frequency is calculated to be T1 = 2.5 N·m. Simultaneously, the current illuminance is obtained from the photovoltaic sensor as 600 W / m². 2 Based on the operating temperature of the solar power module (45℃), the maximum output torque that the solar power module can continuously provide under the current operating conditions is assessed to be T2 = 1.8 N·m. The torque difference ΔT = T1 - T2 = 2.5 - 1.8 = 0.7 N·m is calculated. Based on this torque difference of 0.7 N·m and the electrical characteristics of the compressor drive circuit (such as the relationship between voltage, current and torque), the compensation current required by the auxiliary power supply unit (energy storage battery) is calculated to be I = 1.2 A, and corresponding control commands are issued to ensure that the compressor obtains a stable driving force at the target frequency, effectively completes the oil return action, and avoids excessive output of the auxiliary power supply unit, thereby improving system energy efficiency.

[0050] In one embodiment of the present invention, step 300, the oil return control operation may further include the following: Increase the speed of the outdoor fan.

[0051] Understandably, when the oil return control operation is executed, it controls the compressor to increase its operating frequency from the current frequency to the target frequency, and simultaneously starts the auxiliary power supply unit to output compensating power to the compressor, thus providing sufficient drive torque even when solar power supply is insufficient. At the same time, it increases the speed of the outdoor fan, putting it into a high-speed operation state to enhance the heat dissipation capacity of the condenser side and accelerate the dissipation of heat around the electronic control components (such as the control circuit board). This effectively offsets the increased circuit load and heat generation caused by the combined output torque of the solar energy and the auxiliary power supply unit, preventing the electronic control components from affecting reliability or triggering protection due to excessive temperature rise.

[0052] Optionally, increasing the speed of the outdoor fan can specifically include the following: Based on the power value of the compensation power output by the auxiliary power supply unit, the outdoor fan speed is controlled to increase; wherein, the power value of the compensation power is positively correlated with the target speed of the outdoor fan after it is increased.

[0053] Understandably, the power output of the auxiliary power supply unit is monitored in real time, and the operating speed of the outdoor fan is dynamically adjusted based on the power output. There is a positive correlation between the power output of the auxiliary power supply unit and the target speed that the outdoor fan needs to achieve after being increased. That is, the greater the power output of the auxiliary power supply unit, the greater the torque gap that needs to be compensated, and the greater the additional heat loss generated by the system. Therefore, the target speed of the outdoor fan is set accordingly higher, thereby achieving a match between the heat dissipation intensity and the actual heat load of the system. This ensures effective heat dissipation, maintains stable temperature of the electronic control components, and improves overall energy efficiency.

[0054] In one embodiment of the present invention, step 300, the oil return control operation may further include the following: Reduce the indoor fan speed and / or adjust the opening of the electronic expansion valve.

[0055] Understandably, during the oil return control operation, the following auxiliary adjustments can be implemented simultaneously: reduce the operating speed of the indoor fan to reduce the disturbance to the indoor temperature caused by the additional cooling output due to the increased compressor frequency during the oil return period; adjust the opening of the electronic expansion valve, for example, by appropriately increasing the opening to reduce the high-pressure side pressure and increase the refrigerant flow rate, thereby promoting the circulation and return efficiency of the lubricating oil.

[0056] In one embodiment of the present invention, step 300, after responding to the low-frequency return oil triggering condition, further includes the following: Obtain the current fluctuation amplitude of the compressor; if the current fluctuation amplitude is less than the preset stable threshold and continues for a second preset duration, terminate the oil return control operation.

[0057] Understandably, after responding to the low-frequency oil return trigger condition and executing the oil return control operation, the process also includes monitoring and judging the completion status of the oil return process. Specifically, the real-time operating current of the compressor is continuously acquired and the current fluctuation amplitude is calculated. When the current fluctuation amplitude is detected to drop below a preset stability threshold, and this stable state continues for a second preset duration, it is determined that the lubricating oil has fully returned and the compressor operation has returned to stability, and the oil return control operation is then terminated. In this way, by using current stability, a physical quantity reflecting the compressor load and lubrication status, accurate judgment of the end point of the oil return process is achieved, avoiding the problems of insufficient oil return or excessive operation that may occur with control based on a fixed duration, thereby ensuring the reliability of the oil return process.

[0058] The control device for the solar air conditioner provided by the present invention is described below. The control device for the solar air conditioner described below can be referred to in correspondence with the control method for the solar air conditioner described above.

[0059] A second aspect of the present invention provides a control device for a solar-powered air conditioner, wherein the solar-powered air conditioner includes a compressor, a solar power supply module connected to the compressor, and an auxiliary power supply unit, such as... Figure 3 As shown, the device includes an acquisition module 301, a judgment module 302, and an execution module 303; wherein: The acquisition module 301 is used to acquire the current operating frequency of the compressor and the current ambient temperature when the solar air conditioner is in the operating mode powered by the solar power module.

[0060] The judgment module 302 is used to determine whether the low-frequency oil return trigger condition is met based on the current operating frequency and the current ambient temperature.

[0061] The execution module 303 is used to perform oil return control operations in response to low-frequency oil return triggering conditions. The oil return control operations include: controlling the compressor to increase from the current operating frequency to the target frequency; and starting the auxiliary power supply unit to provide compensation power to the compressor; wherein the target frequency is lower than the preset standard oil return frequency.

[0062] A third aspect of the present invention provides a solar air conditioner, which includes a compressor, a solar power module, an auxiliary power supply unit, and a controller, the controller being configured to execute the control method of the solar air conditioner provided in any of the above embodiments.

[0063] Figure 4 An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 4 As shown, the electronic device may include a processor 410, a communications interface 420, a memory 430, and a communication bus 440, wherein the processor 410, communications interface 420, and memory 430 communicate with each other via the communication bus 440. The processor 410 can call logical instructions in the memory 430 to execute a control method for the solar air conditioner. This method includes: when the solar air conditioner is in operation mode powered by a solar power module, acquiring the current operating frequency of the compressor and the current ambient temperature; determining, based on the current operating frequency and current ambient temperature, that a low-frequency oil return trigger condition is met; and, in response to the low-frequency oil return trigger condition, executing an oil return control operation, which includes: controlling the compressor to increase from the current operating frequency to a target frequency; and activating an auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

[0064] Furthermore, the logical instructions in the aforementioned memory 430 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0065] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method for the solar air conditioner provided by the above methods. The method includes: when the solar air conditioner is in an operating mode powered by a solar power module, acquiring the current operating frequency of the compressor and the current ambient temperature; determining, based on the current operating frequency and the current ambient temperature, that a low-frequency oil return trigger condition is met; and, in response to the low-frequency oil return trigger condition, performing an oil return control operation, the oil return control operation including: controlling the compressor to increase from the current operating frequency to a target frequency; and activating an auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

[0066] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a control method for a solar air conditioner provided by the methods described above. The method includes: when the solar air conditioner is in an operating mode powered by a solar power module, acquiring the current operating frequency of the compressor and the current ambient temperature; determining, based on the current operating frequency and the current ambient temperature, that a low-frequency oil return trigger condition is met; and, in response to the low-frequency oil return trigger condition, performing an oil return control operation, the oil return control operation including: controlling the compressor to increase from the current operating frequency to a target frequency; and activating an auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

[0067] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0068] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of various embodiments or some parts of embodiments.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control method for a solar-powered air conditioner, characterized in that, The solar-powered air conditioner includes a compressor, a solar power module connected to the compressor, and an auxiliary power supply unit. The method includes: When the solar air conditioner is in operation mode powered by the solar power module, the current operating frequency of the compressor and the current ambient temperature are obtained; Based on the current operating frequency and the current ambient temperature, it is determined that the low-frequency oil return trigger condition is met. In response to the low-frequency oil return trigger condition, an oil return control operation is performed, which includes: controlling the compressor to increase from the current operating frequency to a target frequency; and activating the auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

2. The control method for a solar-powered air conditioner according to claim 1, characterized in that, The determination of whether the low-frequency oil return trigger condition is met based on the current operating frequency and the current ambient temperature includes: If the current ambient temperature is lower than the first temperature threshold and the current operating frequency is lower than the first frequency threshold for a first preset duration, it is determined that the low-frequency oil return trigger condition is met.

3. The control method for a solar-powered air conditioner according to claim 1, characterized in that, The step of activating the auxiliary power supply unit to provide compensating power to the compressor includes: Determine the target drive torque required for the compressor to operate at the target frequency; Determine the maximum output torque of the solar power module under the current operating conditions; Determine the torque difference between the target driving torque and the maximum output torque; The auxiliary power supply unit is controlled to output compensation power corresponding to the torque difference to the compressor.

4. The control method for a solar-powered air conditioner according to claim 3, characterized in that, The oil return control operation also includes: Increase the speed of the outdoor fan.

5. The control method for a solar-powered air conditioner according to claim 4, characterized in that, The method of increasing the speed of the outdoor fan includes: Based on the power value of the compensation power output by the auxiliary power supply unit, the outdoor fan speed is controlled to increase; wherein, the power value of the compensation power is positively correlated with the target speed of the outdoor fan after it is increased.

6. The control method for a solar-powered air conditioner according to claim 1, characterized in that, The oil return control operation also includes: Reduce the indoor fan speed and / or adjust the opening of the electronic expansion valve.

7. The control method for a solar-powered air conditioner according to claim 1, characterized in that, The methods for determining the target frequency include: Based on the preset mapping relationship between ambient temperature and oil return frequency, the oil return frequency corresponding to the current ambient temperature is determined as the target frequency; In the mapping relationship, the oil return frequency corresponding to a lower ambient temperature is higher than the oil return frequency corresponding to a higher ambient temperature.

8. The control method for a solar-powered air conditioner according to any one of claims 1 to 7, characterized in that, Following the response to the low-frequency return oil trigger condition, the method further includes: Obtain the current fluctuation amplitude of the compressor; If the current fluctuation amplitude is less than a preset stability threshold and continues for a second preset duration, the oil return control operation is terminated.

9. A control device for a solar-powered air conditioner, characterized in that, The solar-powered air conditioner includes a compressor, a solar power module connected to the compressor, and an auxiliary power supply unit. The device includes: The acquisition module is used to acquire the current operating frequency of the compressor and the current ambient temperature when the solar air conditioner is in the operating mode powered by the solar power module; The judgment module is used to determine whether the low-frequency oil return trigger condition is met based on the current operating frequency and the current ambient temperature. An execution module is configured to perform an oil return control operation in response to the low-frequency oil return trigger condition. The oil return control operation includes: controlling the compressor to increase from the current operating frequency to a target frequency; and activating the auxiliary power supply unit to provide compensating power to the compressor; wherein the target frequency is lower than a preset standard oil return frequency.

10. A solar-powered air conditioning system, characterized in that, include: compressor; Solar power module; Auxiliary power supply unit; The controller is configured to perform the control method of the solar air conditioner as described in any one of claims 1 to 8.

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