Control method and device of air conditioner and air conditioner

Abstract

The application provides a control method and device of an air conditioner and the air conditioner. The method comprises: acquiring a disc tube temperature and an exhaust temperature of a compressor, or a disc tube temperature and a suction temperature of the compressor; determining an oil temperature overheat degree according to the disc tube temperature, the exhaust temperature and an outer ring correction value, or determining the oil temperature overheat degree according to the disc tube temperature, the suction temperature and the outer ring correction value; the outer ring correction value is positively correlated with an outdoor environment temperature; and if the oil temperature overheat degree is less than a preset overheat threshold, the operating frequency of the compressor is increased and / or the opening degree of an electronic expansion valve is reduced. In the embodiment of the application, the exhaust temperature or the suction temperature is corrected to simulate the actual oil temperature overheat degree. If the oil temperature overheat degree is detected to be low, the operating frequency of the compressor is increased and / or the step number of the electronic expansion valve is reduced, so that the oil temperature overheat degree is increased, the reliability of the compressor operation is ensured, the damage rate is reduced and the service life is prolonged.

Description

Technical Field

[0001] This invention relates to the field of air conditioning comfort control technology, and more specifically, to a control method, device, and air conditioner for an air conditioner. Background Technology

[0002] Currently, air conditioners have requirements for the compressor oil temperature superheat (compressor bottom oil temperature - refrigerant saturation temperature), generally ≥5℃. This is to prevent excessive refrigerant return at low temperatures, which would lead to excessively low compressor oil temperature, oil dilution, and increased compressor wear. However, some air conditioners cannot meet the above oil temperature superheat requirements when operating at low temperatures, resulting in a reduced long-term compressor lifespan and potential damage. Summary of the Invention

[0003] To address the aforementioned problems, embodiments of the present invention provide a control method for an air conditioner. The method includes: acquiring the coil temperature and discharge temperature of the compressor, or the coil temperature and suction temperature of the compressor; determining oil temperature superheat based on the coil temperature, the discharge temperature, and an outer loop correction value, or determining oil temperature superheat based on the coil temperature, the suction temperature, and the outer loop correction value; the outer loop correction value is positively correlated with the outdoor ambient temperature; if the oil temperature superheat is less than a preset superheat threshold, increasing the operating frequency of the compressor and / or reducing the opening of the electronic expansion valve.

[0004] The air conditioner control method provided in this embodiment of the invention uses exhaust temperature or intake temperature correction to simulate the actual oil temperature superheat. If the oil temperature superheat is detected to be too low, the operating frequency of the compressor is increased and / or the number of steps of the electronic expansion valve is reduced, thereby increasing the oil temperature superheat, ensuring the reliability of compressor operation, reducing the damage rate, and extending service life.

[0005] Optionally, the calculation formula for determining the oil temperature superheat based on the coil temperature, the exhaust temperature, and the outer ring correction value is as follows:

[0006] ΔT=T 排气 -T 盘管 -K

[0007] Where ΔT is the oil temperature superheat, T 排气 T is the discharge temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0008] Optionally, the calculation formula for determining the oil temperature superheat based on the coil temperature, the suction temperature, and the outer ring correction value is as follows:

[0009] ΔT=T 吸气 -T 盘管 +K

[0010] Where ΔT is the oil temperature superheat, T 吸气 T is the suction temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0011] The present invention provides a formula for calculating oil temperature superheat, which can be corrected by exhaust temperature and intake temperature to obtain the oil temperature at the bottom of the compressor.

[0012] Optionally, after increasing the operating frequency of the compressor, the method further includes: if the detected oil temperature superheat is greater than or equal to the preset superheat threshold, then restoring the operating frequency of the compressor to the operating frequency before the increase; or, if the compressor operating time is longer than a preset time, then restoring the operating frequency of the compressor to the operating frequency before the increase.

[0013] In this embodiment of the invention, after the oil temperature has risen to superheat level, or after the frequency has been increased for a sufficient period of time, the frequency can be reduced back to the original frequency, thereby ensuring the comfort of using the air conditioner.

[0014] Optionally, the increase in the operating frequency of the compressor is negatively correlated with the oil temperature superheat, or the decrease in the number of steps of the electronic expansion valve is negatively correlated with the oil temperature superheat.

[0015] In this embodiment of the invention, the relationship between the increase value of the operating frequency, the decrease step of the electronic expansion valve, and the oil temperature superheat is defined, so as to adjust the above parameters based on the magnitude of the oil temperature superheat and ensure the reliability of compressor operation.

[0016] Optionally, in the case of compressor refrigeration operation: if T 外环 For temperatures ≥30℃, the value of K ranges from 5 to 10; if 20℃ ≤ T 外环 For temperatures <30℃, the value of K ranges from 3 to 5; if 10℃ ≤ T 外环 For temperatures <20℃, the value of K ranges from 2 to 3; if 10℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环 <0℃, K ranges from 0 to 1; under the condition of hot operation of the compressor: if T 外环 For temperatures ≥17℃, the value of K ranges from 5 to 10; if 7℃ ≤ T 外环 <17℃, K ranges from 3 to 5; if 0℃ ≤ T 外环 <7℃, the value of K ranges from 2 to 3; if -7℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环 <-7℃, the value of K ranges from 0 to 1.

[0017] Optionally, when the compressor is operating in cooling mode: if ΔT < 3℃, the increase in the operating frequency of the compressor is in the range of 5-10Hz, and the decrease in the number of steps of the electronic expansion valve is in the range of 5-10B; if 3℃ ≤ ΔT ≤ 5℃, the operating frequency of the compressor remains unchanged, and the decrease in the number of steps of the electronic expansion valve is in the range of 2-5B; if ΔT > 5℃, the operating frequency of the compressor remains unchanged, and the number of steps of the electronic expansion valve remains unchanged.

[0018] The embodiments of the present invention provide the value range of each parameter, which can be used to calculate the oil temperature superheat, control the compressor frequency and the opening degree of the electronic expansion valve, thereby improving the oil temperature superheat and ensuring the reliability of compressor operation.

[0019] This invention provides a control device for an air conditioner, comprising: an acquisition module for acquiring the coil temperature and discharge temperature of a compressor, or the coil temperature and suction temperature of the compressor; an oil temperature superheat calculation module for determining the oil temperature superheat based on the coil temperature, the discharge temperature, and an outer loop correction value, or for determining the oil temperature superheat based on the coil temperature, the suction temperature, and an outer loop correction value; wherein the outer loop correction value is positively correlated with the outdoor ambient temperature; and a control module for increasing the operating frequency of the compressor and / or decreasing the opening of the electronic expansion valve if the oil temperature superheat is less than a preset superheat threshold.

[0020] This invention provides an air conditioner, including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the above-described method.

[0021] This invention provides a computer-readable storage medium storing a computer program, which is read and executed by a processor to implement the above-described method.

[0022] The control device and air conditioner of the present invention can achieve the same technical effect as the control method of the air conditioner described above. Attached Figure Description

[0023] Figure 1 A schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram of the structure of a control device for an air conditioner according to an embodiment of the present invention is shown. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] This invention provides a control logic for preventing liquid return in a variable frequency air conditioner when it operates in a low-temperature environment, ensuring that the oil temperature superheat meets the requirements without affecting the normal use of the air conditioner.

[0027] The air conditioner is equipped with temperature sensors to detect exhaust temperature, suction temperature, evaporator coil temperature, and condenser coil temperature, and uses an electronic expansion valve for throttling (the valve step is adjustable).

[0028] Since the oil temperature at the bottom of the compressor cannot be detected (a sensor cannot be installed), in this embodiment, the discharge temperature is used to correct the oil temperature at the bottom of the compressor for the high-pressure chamber compressor, and the suction temperature is used to correct the oil temperature at the bottom of the compressor for the low-pressure chamber compressor, which can simulate the actual oil temperature superheat.

[0029] Figure 1 A schematic flowchart of a control method for an air conditioner according to an embodiment of the present invention is shown. The method includes the following steps:

[0030] S102, obtain the compressor coil temperature and discharge temperature, or the compressor coil temperature and suction temperature.

[0031] S104, determine the oil temperature superheat based on the aforementioned coil temperature, exhaust temperature, and outer ring correction value, or determine the oil temperature superheat based on the aforementioned coil temperature, intake temperature, and outer ring correction value. The aforementioned outer ring correction value is positively correlated with the outdoor ambient temperature; the higher the outdoor ambient temperature, the larger the outer ring correction value.

[0032] The oil temperature superheat is the difference between the oil temperature at the bottom of the compressor and the saturation temperature corresponding to the discharge pressure, i.e., oil temperature superheat ΔT = oil temperature at the bottom of the compressor - saturation temperature corresponding to the discharge pressure.

[0033] For high-pressure chamber compressors, the coil is located on the high-pressure exhaust side, allowing for the acquisition of exhaust temperature.

[0034] Bottom oil temperature compared to exhaust temperature T 排气 Slightly lower, can be corrected using an outer ring correction factor K. The higher the outdoor ambient temperature, the greater the difference between the exhaust temperature and the bottom oil temperature, therefore a larger corresponding outer ring correction factor needs to be set; the saturation temperature corresponding to the exhaust pressure and the coil temperature T on the high-pressure side. 盘管 Equivalent to (cooling mode is based on condenser coil temperature T) 外盘 The heating mode is set to evaporator coil temperature T. 内盘 ).

[0035] The calculation formula for determining oil temperature superheat based on coil temperature, exhaust temperature, and outer ring correction value is as follows:

[0036] ΔT=T 排气 -T盘管 -K

[0037] Where ΔT is the oil temperature superheat, T 排气 T is the discharge temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0038] For low-pressure chamber compressors, the coil is located on the low-pressure suction side, allowing for the acquisition of suction temperature. The bottom oil temperature is higher than the suction temperature T. 吸气 Slightly higher, it can be corrected using an outer ring correction factor K. The higher the outdoor ambient temperature, the greater the difference between the intake temperature and the bottom oil temperature, therefore a larger corresponding outer ring correction factor needs to be set; the saturation temperature corresponding to the intake pressure and the coil temperature T on the low-pressure side... 盘管 Equivalent to (refrigeration is the evaporator coil temperature T) 内盘 Heating is the temperature T of the condenser coil. 外盘 ).

[0039] The calculation formula for determining oil temperature superheat based on coil temperature, suction temperature, and outer ring correction value is as follows:

[0040] ΔT=T 吸气 -T 盘管 +K

[0041] Where ΔT is the oil temperature superheat, T 吸气 T is the suction temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0042] For example, in the case of compressor refrigeration operation: if T 外环 For temperatures ≥30℃, the value of K ranges from 5 to 10; if 20℃ ≤ T 外环 For temperatures <30℃, the value of K ranges from 3 to 5; if 10℃ ≤ T 外环 For temperatures <20℃, the value of K ranges from 2 to 3; if 10℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环 <0℃, the value of K ranges from 0 to 1;

[0043] Under the condition of hot operation of the compression mechanism: if T 外环 For temperatures ≥17℃, the value of K ranges from 5 to 10; if 7℃ ≤ T 外环 <17℃, K ranges from 3 to 5; if 0℃ ≤ T 外环 <7℃, the value of K ranges from 2 to 3; if -7℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环 <-7℃, the value of K ranges from 0 to 1.

[0044] S106, if the oil temperature superheat is less than the preset superheat threshold, then increase the compressor operating frequency and / or reduce the number of steps of the electronic expansion valve.

[0045] When the oil temperature is detected to be too low during the operation of the air conditioner, increasing the operating frequency of the compressor and reducing the number of steps of the electronic expansion valve can increase the discharge temperature and suction temperature of the compressor, thereby increasing the oil temperature and ensuring the reliability of the compressor operation.

[0046] Optionally, the increase in the operating frequency of the compressor is negatively correlated with the oil superheat, or the reduction step of the electronic expansion valve is negatively correlated with the oil superheat. The lower the oil superheat, the greater the increase in operating frequency and the greater the reduction step.

[0047] For example, if ΔT < 3℃, the range of the increase in the compressor's operating frequency is 5-10Hz, and the range of the decrease in the number of steps of the electronic expansion valve is 5-10B; if 3℃ ≤ ΔT ≤ 5℃, the compressor's operating frequency remains unchanged, and the range of the decrease in the number of steps of the electronic expansion valve is 2-5B; if ΔT > 5℃, the compressor's operating frequency remains unchanged, and the number of steps of the electronic expansion valve remains unchanged.

[0048] The air conditioner control method provided in this embodiment of the invention uses exhaust temperature or intake temperature correction to simulate the actual oil temperature superheat. If the oil temperature superheat is detected to be too low, the operating frequency of the compressor is increased and / or the number of steps of the electronic expansion valve is reduced, thereby increasing the oil temperature superheat, ensuring the reliability of compressor operation, reducing the damage rate, and extending service life.

[0049] Furthermore, after increasing the compressor's operating frequency and / or reducing the opening of the electronic expansion valve based on the above methods, this embodiment also provides control logic to ensure the comfort of using the air conditioner. The above methods also include:

[0050] If the detected oil temperature superheat is greater than or equal to the preset superheat threshold, the compressor's operating frequency will be restored to the operating frequency before the increase; or, the preset superheat threshold can be 3°C.

[0051] If the compressor runs for longer than a preset duration, the compressor's operating frequency will be restored to its previous operating frequency. For example, the preset duration could be 5 minutes.

[0052] In this embodiment, after the oil temperature has risen to superheat level, or after the frequency has been increased for a sufficient period of time, the frequency can be reduced back to the original frequency to ensure the comfort of using the air conditioner.

[0053] The control logic for cryogenic liquid return in high-pressure chamber compressors and low-pressure chamber compressors is described below.

[0054] (a) For high-pressure chamber compressors

[0055] Oil superheat ΔT = Compressor bottom oil temperature - Saturation temperature corresponding to discharge pressure, where the bottom oil temperature is greater than the discharge temperature T. 排气 Slightly lower, can be corrected using an outer ring correction factor K (the higher the ambient temperature, the greater the difference between exhaust temperature and bottom oil temperature); the saturation temperature corresponding to the exhaust pressure and the coil temperature T on the high-pressure side. 盘管 Equivalent to (refrigeration is the condenser coil temperature T) 外盘 Heating is the evaporator coil temperature T. 内盘 The outer ring correction factor K is determined according to the following table:

[0056]

[0057] The calculation formula is as follows: ΔT = T 排气 -T 盘管 -K

[0058] Where ΔT: oil temperature superheat, T 排气 The discharge temperature of the compressor, T 吸气 The compressor's suction temperature, T 盘管 : Coil temperature of evaporator or condenser (where T) 内盘 For evaporator coil temperature, T 外盘 (Condenser coil temperature).

[0059] During air conditioning operation, after the compressor runs continuously for 5 minutes, adjust the compressor's operating frequency F and the electronic expansion valve opening P according to the oil temperature superheat ΔT as shown in the table below.

[0060] Oil temperature superheat ΔT < 3℃ 3℃≤ΔT≤5℃ ΔT>5℃ F +F1 (Recommended 5-10Hz) 0 0 P -P1 (Recommended 5-10B) -P2 (Recommended 2-5B) 0

[0061] If the compressor's operating frequency increases, the frequency will be restored to the operating frequency before the increase after one of the following two conditions is met, and the oil temperature will be re-evaluated and the cycle will restart after 30 minutes.

[0062] 1) ΔT ≥ 3℃;

[0063] 2) Running time after frequency upscaling ≥ 5 min

[0064] (ii) For low-pressure chamber compressors

[0065] Oil superheat ΔT = Compressor bottom oil temperature - Saturation temperature corresponding to suction pressure, where the bottom oil temperature is greater than the suction temperature T. 吸气 Slightly higher, can be corrected using an outer ring correction factor K (the higher the ambient temperature, the greater the difference between the intake temperature and the bottom oil temperature); the saturation temperature corresponding to the intake pressure and the coil temperature T on the low-pressure side. 盘管 Equivalent to (refrigeration is the evaporator coil temperature T) 内盘 Heating is the temperature T of the condenser coil.外盘 The outer ring correction factor K is determined according to the following table:

[0066]

[0067] The calculation formula is as follows: ΔT = T 吸气 -T 盘管 +K

[0068] During air conditioning operation, after the compressor runs continuously for 5 minutes, adjust the compressor's operating frequency F and the electronic expansion valve opening P according to the oil temperature superheat ΔT as shown in the table below.

[0069] Oil temperature superheat ΔT < 3℃ 3℃≤ΔT≤5℃ ΔT>5℃ F +F1 (Recommended 5-10Hz) 0 0 P -P1 (Recommended 5-10B) -P2 (Recommended 2-5B) 0

[0070] If the compressor's operating frequency increases, the frequency will be restored to the operating frequency before the increase after one of the following two conditions is met, and the oil temperature will be re-evaluated and the cycle will restart after 30 minutes.

[0071] 1) ΔT ≥ 3℃;

[0072] 2) Running time after frequency upscaling ≥ 5 min

[0073] Because the oil temperature at the bottom of the compressor cannot be detected (a sensor cannot be installed), the high-pressure compressor uses discharge temperature for correction, while the low-pressure compressor uses suction temperature for correction, which can simulate the actual oil superheat. When the air conditioner is operating at low temperatures, if the detected oil superheat is too low, the compressor's operating frequency is increased and the electronic expansion valve's steps are reduced. This increases the compressor's discharge and suction temperatures, thereby increasing the oil superheat and ensuring the compressor's operational reliability. Once the oil superheat has increased, the frequency is reduced back to its original level, ensuring the comfort of the air conditioner user.

[0074] Figure 2 A schematic diagram of a control device for an air conditioner according to an embodiment of the present invention is shown. The device includes:

[0075] The acquisition module 201 is used to acquire the coil temperature and discharge temperature of the compressor, or the coil temperature and suction temperature of the compressor.

[0076] The oil temperature superheat calculation module 202 is used to determine the oil temperature superheat based on the coil temperature, the exhaust temperature, and the outer ring correction value, or to determine the oil temperature superheat based on the coil temperature, the intake temperature, and the outer ring correction value; the outer ring correction value is positively correlated with the outdoor ambient temperature;

[0077] The control module 203 is used to increase the operating frequency of the compressor and / or reduce the opening of the electronic expansion valve if the oil temperature superheat is less than a preset superheat threshold.

[0078] The control device for the air conditioner provided in this embodiment of the invention uses exhaust temperature or intake temperature correction to simulate the actual oil temperature superheat. If the oil temperature superheat is detected to be too low, the operating frequency of the compressor is increased and / or the number of steps of the electronic expansion valve is reduced, thereby increasing the oil temperature superheat, ensuring the reliability of compressor operation, reducing the damage rate, and extending service life.

[0079] As a feasible method, the calculation formula for determining the oil temperature superheat based on the coil temperature, the exhaust temperature, and the outer ring correction value is as follows:

[0080] ΔT=T 排气 -T 盘管 -K

[0081] Where ΔT is the oil temperature superheat, T 排气 T is the discharge temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0082] As a feasible method, the calculation formula for determining the oil temperature superheat based on the coil temperature, the suction temperature, and the outer ring correction value is as follows:

[0083] ΔT=T 吸气 -T 盘管 +K

[0084] Where ΔT is the oil temperature superheat, T 吸气 T is the suction temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

[0085] As a possible approach, the control module is further configured to: if the detected oil temperature superheat is greater than or equal to the preset superheat threshold, restore the compressor's operating frequency to the operating frequency before the increase; or, if the compressor's operating time is longer than the preset time, restore the compressor's operating frequency to the operating frequency before the increase.

[0086] As a possible approach, the increase in the operating frequency of the compressor is negatively correlated with the oil temperature superheat, or the decrease in the number of steps of the electronic expansion valve is negatively correlated with the oil temperature superheat.

[0087] As a feasible approach, under the condition that the compressor is operating in refrigeration mode: if T 外环 For temperatures ≥30℃, the value of K ranges from 5 to 10; if 20℃ ≤ T 外环 For temperatures <30℃, the value of K ranges from 3 to 5; if 10℃ ≤ T 外环 For temperatures <20℃, the value of K ranges from 2 to 3; if 10℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环<0℃, K ranges from 0 to 1; under the condition of hot operation of the compressor: if T 外环 For temperatures ≥17℃, the value of K ranges from 5 to 10; if 7℃ ≤ T 外环 <17℃, K ranges from 3 to 5; if 0℃ ≤ T 外环 <7℃, the value of K ranges from 2 to 3; if -7℃ ≤ T 外环 <0℃, K ranges from 1 to 2; if T 外环 <-7℃, the value of K ranges from 0 to 1.

[0088] As a feasible approach, under the condition that the compressor is operating in cooling mode: if ΔT < 3℃, the increase in the operating frequency of the compressor is in the range of 5-10Hz, and the decrease in the number of steps of the electronic expansion valve is in the range of 5-10B; if 3℃ ≤ ΔT ≤ 5℃, the operating frequency of the compressor remains unchanged, and the decrease in the number of steps of the electronic expansion valve is in the range of 2-5B; if ΔT > 5℃, the operating frequency of the compressor remains unchanged, and the number of steps of the electronic expansion valve remains unchanged.

[0089] This invention provides an air conditioner, including a computer-readable storage medium storing a computer program and a processor, wherein the computer program is read and executed by the processor to implement the above-described method.

[0090] This invention also provides a computer-readable storage medium storing a computer program. When the computer program is read and executed by a processor, it implements the method provided in the above embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here. The computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc.

[0091] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0092] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0093] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0094] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Regarding the control device and air conditioner disclosed in the embodiments, since they correspond to the control method of the air conditioner disclosed in the above embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0095] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A control method for an air conditioner, characterized in that, The method includes: Obtain the coil temperature and discharge temperature of the compressor, or the coil temperature and suction temperature of the compressor; The oil temperature superheat is determined based on the coil temperature, the exhaust temperature, and the outer ring correction value, or based on the coil temperature, the intake temperature, and the outer ring correction value; the outer ring correction value is positively correlated with the outdoor ambient temperature. If the oil temperature superheat is less than the preset superheat threshold, the operating frequency of the compressor is increased and / or the opening of the electronic expansion valve is reduced.

2. The method as described in claim 1, characterized in that, The formula for calculating the oil temperature superheat based on the coil temperature, the exhaust temperature, and the outer ring correction value is as follows: ΔT=T 排气 -T 盘管 -K Where ΔT is the oil temperature superheat, T 排气 T is the discharge temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

3. The method as described in claim 1, characterized in that, The formula for calculating the oil temperature superheat based on the coil temperature, the suction temperature, and the outer ring correction value is as follows: ΔT=T 吸气 -T 盘管 +K Where ΔT is the oil temperature superheat, T 吸气 T is the suction temperature of the compressor. 盘管 Where K is the coil temperature of the compressor, and K is the outer loop correction value.

4. The method as described in claim 1, characterized in that, After increasing the operating frequency of the compressor, the method further includes: If the detected oil temperature superheat is greater than or equal to the preset superheat threshold, then the compressor's operating frequency is restored to its previous operating frequency; or, If the compressor runs for longer than a preset duration, the compressor's operating frequency will be restored to its previous operating frequency.

5. The method as described in claim 1, characterized in that, The increase in the operating frequency of the compressor is negatively correlated with the oil temperature superheat, or the decrease in the number of steps of the electronic expansion valve is negatively correlated with the oil temperature superheat.

6. The method as described in claim 2 or 3, characterized in that, When the compressor is operating in refrigeration mode: If T 外环 For temperatures ≥30℃, the value of K ranges from 5 to 10. If 20℃≤T 外环 For temperatures below 30℃, the value of K ranges from 3 to 5. If 10℃≤T 外环 For temperatures below 20℃, the value of K ranges from 2 to 3. If 10℃≤T 外环 <0℃, the value of K ranges from 1 to 2; If T 外环 <0℃, the value of K ranges from 0 to 1; When the compression mechanism is in hot operation: If T 外环 For temperatures ≥17℃, the value of K ranges from 5 to 10. If 7℃≤T 外环 <17℃, the value of K ranges from 3 to 5; If 0℃≤T 外环 <7℃, the value of K ranges from 2 to 3; If -7℃≤T 外环 <0℃, the value of K ranges from 1 to 2; If T 外环 <-7℃, the value of K ranges from 0 to 1; Among them, T 外环 The ambient temperature.

7. The method as described in claim 2 or 3, characterized in that, When the compressor is operating in refrigeration mode: If ΔT < 3℃, the range of the increase in the operating frequency of the compressor is 5-10Hz, and the range of the decrease in the number of steps of the electronic expansion valve is 5-10B. If 3℃≤ΔT≤5℃, the operating frequency of the compressor remains unchanged, and the value range of the reduction of the number of steps of the electronic expansion valve is 2-5B; If ΔT > 5℃, the operating frequency of the compressor remains unchanged, and the number of steps of the electronic expansion valve remains unchanged.

8. A control device for an air conditioner, characterized in that, The device includes: The acquisition module is used to acquire the coil temperature and discharge temperature of the compressor, or the coil temperature and suction temperature of the compressor. The oil temperature superheat calculation module is used to determine the oil temperature superheat based on the coil temperature, the exhaust temperature, and the outer ring correction value, or based on the coil temperature, the intake temperature, and the outer ring correction value; the outer ring correction value is positively correlated with the outdoor ambient temperature; The control module is used to increase the operating frequency of the compressor and / or reduce the opening of the electronic expansion valve if the oil temperature superheat is less than a preset superheat threshold.

9. An air conditioner, characterized in that, The method includes a computer-readable storage medium storing a computer program, which is read and executed by the processor to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when read and executed by a processor, implements the method as described in any one of claims 1-7.

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