Protection control method of air conditioner, air conditioner and computer readable storage medium

Abstract

The invention discloses a protection control method of an air conditioner, the air conditioner and a computer readable storage medium, and the protection control method comprises the steps that operation parameters of the air conditioner are obtained, and the operation parameters comprise at least one of system current, system pressure and system temperature; the opening degree adjusting speed of an electronic expansion valve of the air conditioner is determined according to the operation parameters; and the opening degree of the electronic expansion valve is adjusted at the opening degree adjusting speed, so that the system pressure of the air conditioner is reduced. According to the embodiment of the invention, large pressure fluctuation of the system in the operation process of the air conditioner can be avoided, frequent opening and closing of the bypass pressure relief valve or shutdown of the system are avoided, and the adjusting effect of the air conditioner is improved.

Description

Technical Field

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

[0002] The natural refrigerant carbon dioxide is non-toxic and non-flammable, has stable chemical properties and a wide range of sources. The promotion and application of carbon dioxide refrigerant in cooling and heating equipment (such as air conditioners) is of great significance for improving the greenhouse effect and promoting green and low-carbon social development.

[0003] Carbon dioxide refrigeration or heating mostly uses a transcritical cycle. In the supercritical state, the system pressure is 10-12MPa. Excessive pressure is prone to leakage and the risk of copper pipe explosion. In the related art, a mechanical bypass pressure relief valve is set in the refrigeration or heating system to prevent excessive pressure. When the pressure is higher than the set value, the bypass pressure relief valve automatically opens and the high-pressure refrigerant is relieved to the low-pressure side; when the pressure is lower than a certain set value, the bypass pressure relief valve automatically closes and the system resumes normal operation. During the operation of the system, as long as the pressure reaches the set value, the bypass pressure relief valve will be triggered. The bypass pressure relief valve switching process will cause large system fluctuations and affect the regulation effect of the air conditioner.

[0004] It should be noted that the above contents are only used to assist in understanding the technical problems solved by the present invention, and do not constitute an admission that the above contents are prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a protection control method for an air conditioner, an air conditioner and a computer-readable storage medium, aiming to avoid large system pressure fluctuations during the operation of the air conditioner, avoid frequent switching of the bypass pressure relief valve or system shutdown, and improve the regulation effect of the air conditioner.

[0006] Based on this, the present invention provides a protection control method for an air conditioner, the protection control method for the air conditioner comprising the following steps:

[0007] Acquiring an operating parameter of the air conditioner, wherein the operating parameter includes at least one of a system current, a system pressure, and a system temperature;

[0008] Determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters;

[0009] The opening of the electronic expansion valve is adjusted at the opening adjustment speed.

[0010] Optionally, the step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters comprises:

[0011] Determining the interval in which the operating parameter is located;

[0012] The opening adjustment speed of the electronic expansion valve is determined according to the interval in which the operating parameter is located.

[0013] Optionally, the step of comparing the operating parameter with each interval to determine the interval in which the operating parameter is located includes:

[0014] Obtaining a ratio of the operating parameter to a standard operating parameter;

[0015] When the ratio is greater than or equal to a first preset value, determining that the operating parameter is in a first interval;

[0016] When the ratio is less than or equal to a second preset value, it is determined that the operating parameter is in a second interval, wherein a first opening adjustment speed corresponding to the first interval is greater than a second opening adjustment speed corresponding to the second interval.

[0017] Optionally, the protection control method of the air conditioner further includes:

[0018] Acquiring operating environment parameters of the air conditioner;

[0019] Obtain standard operating parameters corresponding to the operating environment parameters.

[0020] Optionally, the protection control method of the air conditioner further includes:

[0021] Determining a target opening of the electronic expansion valve according to the interval of the operating parameter;

[0022] Adjusting the opening of the electronic expansion valve at the opening adjustment speed includes adjusting the opening of the electronic expansion valve to the target opening at the opening adjustment speed.

[0023] Optionally, after the step of adjusting the opening of the electronic expansion valve at the opening adjustment speed, the method further includes:

[0024] determining the system superheat according to the return air temperature and the evaporation temperature of the air conditioner;

[0025] The operating frequency of the compressor and / or the speed of the indoor fan are adjusted according to the system superheat.

[0026] Optionally, the step of adjusting the operating frequency of the compressor and / or the speed of the indoor fan according to the system superheat comprises:

[0027] When the system superheat is on an upward trend, controlling the compressor at a current operating frequency, and / or increasing the speed of the indoor fan;

[0028] When the system superheat is on a downward trend, the operating frequency of the compressor is increased to a target frequency at a preset speed, and / or the rotation speed of the indoor fan is increased to a target rotation speed.

[0029] Optionally, after the step of obtaining the operating parameters of the air conditioner, the method further includes:

[0030] determining whether the refrigerant of the air conditioner is leaking according to the operating parameters;

[0031] If so, the bypass pressure relief valve arranged in the air conditioning system flow path is controlled to open;

[0032] If not, the step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters is performed.

[0033] The present invention also provides an air conditioner, comprising a memory, a processor, and a protection control program stored in the memory and executable on the processor, wherein the protection control program implements the steps of the protection control method for the air conditioner as described above when executed by the processor.

[0034] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a protection control program, and when the protection control program is executed by a processor, the steps of the protection control method for the air conditioner as described above are implemented.

[0035] The protection control method, device, multi-split unit and readable storage medium of the air conditioner provided by the present invention, in the embodiment of the present invention, during the operation of the air conditioner, the operating parameters are detected to determine whether the system is about to reach a supercritical state, and then the opening of the electronic expansion valve of the air conditioner is adjusted in advance according to the judgment result, and the opening adjustment speed of the electronic expansion valve is increased, so that the system can quickly reduce the pressure and avoid reaching a supercritical state. In this way, it can be avoided that the system pressure is too high and triggers high-pressure protection, so that the system pressure is continuously maintained in a stable state. In this way, it can be avoided that the bypass pressure relief valve is frequently opened and closed due to high pressure triggering, and large system fluctuations are avoided, so as to ensure the normal operation of the air conditioner and improve the regulation effect of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 A schematic diagram of the hardware environment architecture involved in the protection and control method for an air conditioner provided by the present invention;

[0038] Figure 2 A schematic flow chart of a first embodiment of a protection control method for an air conditioner provided by the present invention;

[0039] Figure 3 A schematic flow chart of a second embodiment of the protection control method for an air conditioner provided by the present invention;

[0040] Figure 4 This is a flow chart of a third embodiment of the protection control method for an air conditioner provided by the present invention.

[0041] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0043] The natural refrigerant carbon dioxide is non-toxic and non-flammable, has stable chemical properties and a wide range of sources. The promotion and application of carbon dioxide refrigerant in cooling and heating equipment (such as air conditioners) is of great significance for improving the greenhouse effect and promoting green and low-carbon social development.

[0044] Carbon dioxide refrigeration or heating mostly uses a transcritical cycle. In the supercritical state, the system pressure is 10-12Mpa. Excessive pressure is prone to leakage and the risk of copper pipe explosion. In the related art, a mechanical bypass pressure relief valve is set in the refrigeration or heating system to prevent excessive pressure. When the pressure is higher than the set value, the bypass pressure relief valve automatically opens and the high-pressure refrigerant is relieved to the low-pressure side; when the pressure is lower than a certain set value, the bypass pressure relief valve automatically closes and the system resumes normal operation. During the operation of the system, as long as the pressure reaches the set value, the bypass pressure relief valve will be triggered. The bypass pressure relief valve switching process will cause large system fluctuations and affect the regulation effect of the air conditioner.

[0045] Based on this, an embodiment of the present invention provides a protection control method for an air conditioner, which prevents excessive pressure from triggering high-pressure protection in advance by detecting the operating parameters of the air-conditioning system in real time or at regular intervals, so that the system pressure is continuously maintained in a stable state. In this way, frequent switching of the bypass pressure relief valve triggered by high pressure can be avoided, and large system fluctuations can be avoided. In this way, the normal operation of the air conditioner is guaranteed and the regulation effect of the air conditioner is improved.

[0046] In order to better understand the technical solutions provided by the embodiments of the present invention, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0047] As an implementation method, the hardware environment architecture involved in the protection control method of the air conditioner can be as follows: Figure 1 shown.

[0048] Optionally, the hardware architecture involved in the protection control method of the air conditioner includes the air conditioner or a control device of the air conditioner.

[0049] As an implementation, the air conditioner or control device includes: a processor 101, such as a CPU, a memory 102, and a communication bus 103. The communication bus 103 is used to realize the connection and communication between these components. The processor 101 is used to call an application to perform a control operation.

[0050] The memory 102 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory.

[0051] It can be understood that, in one embodiment, the protection control program for implementing the protection of the air conditioner is stored in the memory 102, or in a computer-readable storage medium, and when the processor 101 calls the protection control program from the memory 102 or the computer-readable storage medium, the following operations are performed:

[0052] Acquiring an operating parameter of the air conditioner, wherein the operating parameter includes at least one of a system current, a system pressure, and a system temperature;

[0053] Determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters;

[0054] The opening of the electronic expansion valve is adjusted at the opening adjustment speed to adjust abnormal parameters of the air conditioner system, such as reducing an excessively high system pressure of the air conditioner.

[0055] Based on the hardware architecture of the above-mentioned air conditioner or mobile device, the following embodiments of the present invention are proposed.

[0056] First embodiment

[0057] Please refer to Figure 2 The protection control method of the air conditioner proposed in the embodiment of the present invention comprises the following steps:

[0058] Step S110, obtaining the operating parameters of the air conditioner;

[0059] Wherein, the operating parameter includes at least one of system current, system pressure and system temperature;

[0060] The embodiments of the present invention relate to high-voltage protection for an air conditioner, and more particularly to high-voltage protection for an air conditioner using carbon dioxide as a refrigerant.

[0061] Optionally, the air conditioner in the embodiment of the present invention realizes cooling or heating based on carbon dioxide. The air conditioner can be used as an all-in-one unit in the kitchen or as a split unit in the bedroom.

[0062] Carbon dioxide cooling or heating mostly uses transcritical cycles. During the operation of the air conditioner, if it is in a supercritical state, the system pressure is 10-12Mpa. Excessive pressure is prone to leakage and the risk of copper pipe explosion. Therefore, when the system pressure is too high, high-pressure protection will be activated, such as shutting down the compressor or opening the bypass pressure relief valve.

[0063] The high-pressure protection method will have a greater impact on the air-conditioning system. For example, if the compressor stops, the system cannot perform cooling / heating normally. After the bypass pressure relief valve is opened, the system will quickly release pressure, resulting in large system fluctuations.

[0064] Based on this, this embodiment detects the operating parameters of the air conditioner in real time or at regular intervals during the operation of the air conditioner, and prevents the system pressure from reaching a supercritical state in advance, thereby avoiding the system from starting high-pressure protection.

[0065] In other embodiments, the control method of the embodiment of the present invention can also be used in systems using other refrigerants.

[0066] Optionally, in this embodiment, the operating parameter includes at least one of a system current, a system pressure, and a system temperature. The system current refers to the whole current of the air conditioner, the system pressure refers to the high pressure pressure of the system, such as the pressure on the high pressure side of the system, and the system temperature refers to the temperature used to determine the refrigerant leakage of the system, including but not limited to the exhaust temperature, the evaporation temperature, etc.

[0067] In this embodiment, the system pressure state is detected by detecting at least one operating parameter, and the system pressure is detected specifically according to the operating parameter corresponding to the pressure detection method adopted by the air conditioner. For example, the air conditioner is equipped with a pressure sensor, and when the pressure sensor is used to detect the system pressure, the operating parameter is the system pressure. If the air conditioner is not provided with a pressure sensor, and the system pressure needs to be detected by the system current, the operating parameter is the system current. Alternatively, when the system pressure needs to be detected by the system temperature, the operating parameter is the system temperature. Optionally, if the air conditioner is equipped with a pressure sensor, the system pressure detected by the pressure sensor is preferentially used as the operating parameter for determining whether the system pressure is too high or whether the system refrigerant is leaking.

[0068] Therefore, in this embodiment, the step of obtaining the operating parameters of the air conditioner also includes obtaining the system pressure. If the system pressure is not obtained, the system current and / or system temperature are obtained, and the system pressure is detected based on the system current and / or system pressure.

[0069] Step S120, determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters;

[0070] In this embodiment, it is possible to identify and judge whether the air conditioning system will soon trigger high-pressure shutdown protection or refrigerant leakage protection based on the operating parameters, and then adjust the electronic expansion valve of the air conditioner in advance and increase the adjustment speed of the electronic expansion valve so that the pressure of the system can quickly reach equilibrium and avoid high-pressure shutdown protection or high-pressure refrigerant leakage.

[0071] For example, in the related art, when the system pressure reaches or approaches the critical value for triggering high-pressure shutdown protection or high-pressure refrigerant leakage according to the operating parameters, the opening of the electronic expansion valve of the air conditioner is controlled to reduce the system pressure. However, it takes time for the electronic expansion valve to open to a certain opening, such as 10 seconds, and the system pressure will continue to rise within 10 seconds. In this way, the system pressure reaches the critical value before the electronic expansion valve opens to a certain opening, and the shutdown protection or high-pressure refrigerant leakage protection is triggered.

[0072] This embodiment increases the opening speed of the electronic expansion valve by increasing the opening speed of the electronic expansion valve to avoid the system pressure from reaching the critical value as much as possible. If the electronic expansion valve opens to the target opening within 3 seconds, the opening speed of the electronic expansion valve is greater than the rising speed of the system pressure, and the high-pressure side pressure is quickly reduced. If the system pressure does not reach the critical value, the shutdown protection or high-pressure refrigerant leakage protection will not be triggered.

[0073] In this embodiment, the opening adjustment speed can be a pre-set fixed value; it can also be divided into multiple values ​​according to the specific numerical values ​​of the operating parameters, and the opening adjustment speeds corresponding to different operating parameters are different. For example, according to the changes in the operating parameters during the operation of the air conditioner, multiple operating parameter intervals are divided, and each interval corresponds to an opening adjustment speed. Then, the opening adjustment speed is determined according to the interval in which the operating parameters are located during the actual operation of the air conditioner.

[0074] For example, the step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters includes:

[0075] Comparing the operating parameter with each interval to determine the interval in which the operating parameter is located;

[0076] The opening adjustment speed of the electronic expansion valve is determined according to the interval in which the operating parameter is located.

[0077] In this embodiment, the opening adjustment speeds of the electronic expansion valve corresponding to different intervals are different, and the larger the value corresponding to the interval is, the larger the corresponding opening adjustment speed is.

[0078] In an optional embodiment, different intervals are set according to the difference from the standard operating parameters, and different intervals correspond to different opening adjustment speeds. For example, when the operating parameters differ greatly from the standard operating parameters, it is defined as the first interval, and when the operating parameters differ less than the standard operating parameters, it is defined as the second interval, wherein the first opening adjustment speed corresponding to the first interval is greater than the second opening adjustment speed corresponding to the second interval. In this embodiment, the difference between the operating parameters and the standard operating parameters is determined based on the ratio of the operating parameters to the standard operating parameters.

[0079] For example, in this embodiment, the step of comparing the operating parameter with each interval to determine the interval in which the operating parameter is located includes:

[0080] Comparing the operating parameters with standard operating parameters to obtain a ratio;

[0081] When the ratio is greater than or equal to a first preset value, determining that the operating parameter is in a first interval;

[0082] When the ratio is less than or equal to a second preset value, it is determined that the operating parameter is in a second interval.

[0083] It should be noted that the standard operating parameters refer to the normal operating parameters of the air-conditioning system when the system is operating normally (the pressure is in a stable state without high pressure).

[0084] When the ratio of the operating parameter to the standard operating parameter is greater than the first preset threshold, it indicates that the system pressure is much higher than the normal value at this time, and the high-pressure shutdown protection or the pressure relief measure (refrigerant leakage protection) will be triggered soon. It is necessary to reduce the system pressure as soon as possible. Therefore, the opening degree of the electronic expansion valve is adjusted at the first opening degree adjustment speed.

[0085] When the ratio of the operating parameter to the standard operating parameter is less than or equal to the first preset threshold, it indicates that the system pressure is high at this time, but the high-pressure shutdown protection or the pressure relief measure or the refrigerant leakage protection will not be triggered. If the opening degree of the electronic expansion valve is adjusted by the first opening degree adjustment value, it will cause greater fluctuations in the system and affect the adjustment effect of the air conditioner. Therefore, a relatively lower speed is adopted to adjust the opening degree of the electronic expansion valve to avoid large fluctuations in the system while the system pressure rises to the critical value, making the system more stable.

[0086] Optionally, in this embodiment, the first preset threshold is greater than or equal to the second preset threshold. Optionally, the range of the first preset threshold or the second preset threshold is 8% < X ≤ 20%, where X is the first preset threshold or the second preset threshold.

[0087] Optionally, in this embodiment, the standard operating parameter can be a fixed value, or the standard operating parameters corresponding to different operating environments are different. Therefore, in this embodiment, it is also necessary to obtain the corresponding standard operating parameter according to the current operating environment parameter of the air conditioner to obtain the standard operating parameter adapted to the current operating environment, and judge the refrigerant leakage situation of the air conditioner based on this standard operating parameter, with higher accuracy.

[0088] Step S130, adjust the opening degree of the electronic expansion valve at the opening degree adjustment speed.

[0089] By the above method, the system pressure of the air conditioner can be effectively reduced.

[0090] In this embodiment, the opening degree of the electronic expansion valve is adjusted to the target opening degree according to the opening degree adjustment speed.

[0091] Optionally, the target opening degree can be a fixed value. For example, according to the set parameters of the air conditioner, the target opening degree of the electronic expansion valve is determined. In this embodiment, the purpose of reducing the system pressure of the air conditioner is achieved by accelerating the adjustment speed of the electronic expansion valve.

[0092] Optionally, the protection control method of the air conditioner further includes:

[0093] Determine the target opening degree of the electronic expansion valve according to the interval where the operating parameter is located.

[0094] Adjust the opening degree of the electronic expansion valve to the target opening degree at the opening degree adjustment speed.

[0095] That is, the target opening degree of the electronic expansion valve varies according to different current operating parameters of the air conditioner. For example, when the current operating parameters of the air conditioner are relatively large, the opening degree of the electronic expansion valve is correspondingly adjusted to be larger, corresponding to the first target opening degree; if the current operating parameters of the air conditioner are relatively small, then it is not necessary to adjust the opening degree of the electronic expansion valve so large, corresponding to the second target opening degree.

[0096] The following takes the system current as the operating parameter to illustrate the specific process of this embodiment.

[0097] During the operation of the air conditioner, obtain the system current and calculate the ratio of the system current to the corresponding standard system current under the same operating environment. If the ratio is greater than the first preset threshold, adjust the opening degree of the electronic expansion valve at the first opening adjustment speed so that the electronic expansion valve quickly opens to the first target opening degree; if the ratio is less than the second preset threshold, adjust the opening degree of the electronic expansion valve at the second opening adjustment speed so that the electronic expansion valve quickly opens to the second target opening degree.

[0098] Optionally, in this example, the first opening adjustment speed is Pts1, 75pps < Pts1 ≤ 95pps; the second opening adjustment speed is Pts2, 45pps < Pts2 ≤ 75pps; the first target opening degree is Pkd1, 300p < Pkd1 ≤ 380p; the second target opening degree is Pkd2, 380p < Pkd2 ≤ 480p.

[0099] During the operation of the air conditioner in this embodiment, by detecting the operating parameters to determine whether the system is about to reach the supercritical state, and then adjusting the opening degree of the electronic expansion valve of the air conditioner in advance according to the judgment result, and increasing the opening adjustment speed of the electronic expansion valve, so that the system quickly reduces pressure and avoids reaching the supercritical state. In this way, it is possible to avoid the system pressure being too high and triggering the high-pressure protection, so that the system pressure can be continuously maintained in a stable state. In this way, it is possible to avoid the high pressure triggering the bypass pressure relief valve to switch frequently or the system to shut down, avoid large system fluctuations, ensure the normal operation of the air conditioner, and improve the adjustment effect of the air conditioner.

[0100] Second Embodiment

[0101] Please refer to Figure 3 , based on the above first embodiment, after the step of adjusting the opening degree of the electronic expansion valve at the opening adjustment speed in the first embodiment, it further includes:

[0102] Step S140, determine the system superheat degree according to the suction gas temperature and the evaporation temperature of the air conditioner;

[0103] Step S150, adjust the operating frequency of the compressor and / or the rotational speed of the indoor fan according to the system superheat degree.

[0104] After the opening of the electronic expansion valve is quickly adjusted to the target opening, the system pressure will be affected and will fluctuate. Based on this, after adjusting the opening of the electronic expansion valve, this embodiment adjusts the operating frequency of the compressor and the speed of the indoor fan, so that not only the system pressure is in a stable state, but also the superheat is in a stable state.

[0105] Optionally, in this embodiment, the adjustment method of the system superheat includes but is not limited to:

[0106] When the system superheat is on an upward trend, controlling the compressor at a current operating frequency, and / or increasing the speed of the indoor fan;

[0107] When the system superheat is on a downward trend, the operating frequency of the compressor is increased to a target frequency at a preset speed, and / or the rotation speed of the indoor fan is increased to a target rotation speed.

[0108] That is, if the system superheat is on an upward trend at this time, the compressor frequency maintains the current frequency, and the fan speed is increased to a higher speed to reduce the system superheat; if the superheat is on a downward trend at this time, the compressor frequency is increased to the target speed at the default speed (the preset speed), and the fan speed is increased to the target speed to maintain the system superheat in a stable state.

[0109] It is understandable that when the increase or decrease of the system superheat is within the preset range, the fluctuation range is determined to be normal, the system is in a stable state, and the control system can operate stably according to the current operating parameters. If it is not within the preset range, return to S110 to readjust and judge.

[0110] Third embodiment

[0111] Please refer to Figure 4 This embodiment is based on all the above embodiments. On the basis of all the above embodiments, after the step of obtaining the operating parameters of the air conditioner, it also includes:

[0112] Step S160, determining whether the refrigerant of the air conditioner is leaking according to the operating parameters;

[0113] If yes, then execute step S170 to control the bypass pressure relief valve disposed in the air conditioning system flow path to open;

[0114] If not, the step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters is performed.

[0115] In this embodiment, after the air conditioner has been running for a preset time, the operating parameters of the air conditioner are obtained, and then it is determined whether the refrigerant of the air conditioner is leaking according to the operating parameters. If it is currently leaking, the bypass pressure relief valve is directly controlled to open, and the pressure is quickly released to prevent the refrigerant from continuing to leak. If the refrigerant is not leaking, the air conditioner is protected and controlled according to the method described in the first and second embodiments above to prevent the air conditioner system pressure fluctuation from causing refrigerant leakage or triggering shutdown protection, etc., so that the system operates in a stable state and improves the regulation effect of the air conditioner.

[0116] Optionally, the preset duration is Ty, 12 minutes <Ty≤20min。

[0117] In this embodiment, if it is determined that the refrigerant has leaked, the system is processed using a refrigerant leakage processing method, which can effectively solve the problem of refrigerant leakage. If the refrigerant has not leaked, the system operating parameters are monitored and the opening adjustment speed of the electronic expansion valve is appropriately adjusted to avoid refrigerant leakage caused by system high pressure, avoid triggering high-pressure protection, and improve the stability of the air-conditioning system.

[0118] The present invention also provides an air conditioner, comprising a memory, a processor, and a protection control program stored in the memory and executable on the processor, wherein the protection control program implements the steps of the protection control method for the air conditioner as described above when executed by the processor.

[0119] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a protection control program, and when the protection control program is executed by a processor, the steps of the protection control method for the air conditioner as described above are implemented.

[0120] It should be noted that 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 specification 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 protection control method for an air conditioner, characterized in that: The protection control method of the air conditioner comprises the following steps: Acquiring an operating parameter of the air conditioner, wherein the operating parameter includes at least one of a system current, a system pressure, and a system temperature; Determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters; The opening of the electronic expansion valve is adjusted at the opening adjustment speed.

2. The protection control method of the air conditioner according to claim 1, characterized in that: The step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters comprises: Determining the interval in which the operating parameter is located; The opening adjustment speed of the electronic expansion valve is determined according to the interval in which the operating parameter is located.

3. The protection control method of the air conditioner according to claim 2, characterized in that: The step of determining the interval in which the operating parameter is located comprises: Obtaining a ratio of the operating parameter to a standard operating parameter; When the ratio is greater than or equal to a first preset value, determining that the operating parameter is in a first interval; When the ratio is less than or equal to a second preset value, it is determined that the operating parameter is in a second interval, wherein a first opening adjustment speed corresponding to the first interval is greater than a second opening adjustment speed corresponding to the second interval.

4. The protection control method for an air conditioner according to claim 3, characterized in that: The protection control method of the air conditioner also includes: Acquiring operating environment parameters of the air conditioner; Obtain standard operating parameters corresponding to the operating environment parameters.

5. The protection control method for an air conditioner according to claim 2, characterized in that: The protection control method for the air conditioner further includes: determining a target opening of the electronic expansion valve according to the interval in which the operating parameter is located; Adjusting the opening of the electronic expansion valve at the opening adjustment speed includes adjusting the opening of the electronic expansion valve to the target opening at the opening adjustment speed.

6. The protection control method for an air conditioner according to any one of claims 1 to 5, characterized in that: After the step of adjusting the opening of the electronic expansion valve at the opening adjustment speed, the method further includes: determining the system superheat according to the return air temperature and the evaporation temperature of the air conditioner; The operating frequency of the compressor and / or the speed of the indoor fan of the air conditioner are adjusted according to the system superheat.

7. The protection control method for an air conditioner according to claim 6, characterized in that: The step of adjusting the operating frequency of the compressor and / or the speed of the indoor fan of the air conditioner according to the system superheat comprises: When the system superheat is on an upward trend, controlling the compressor at a current operating frequency, and / or increasing the speed of the indoor fan; When the system superheat is on a downward trend, the operating frequency of the compressor is increased to a target frequency at a preset speed, and / or the rotation speed of the indoor fan is increased to a target rotation speed.

8. The protection control method for an air conditioner according to claim 1, characterized in that: After the step of obtaining the operating parameters of the air conditioner, the method further includes: determining whether the refrigerant of the air conditioner is leaking according to the operating parameters; If so, the bypass pressure relief valve arranged in the air conditioning system flow path is controlled to open; If not, the step of determining the opening adjustment speed of the electronic expansion valve of the air conditioner according to the operating parameters is performed.

9. An air conditioner, characterized in that: The air conditioner includes a memory, a processor, and a protection control program stored in the memory and executable on the processor. When the protection control program is executed by the processor, the steps of the protection control method for the air conditioner as described in any one of claims 1 to 8 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a protection control program, and when the protection control program is executed by a processor, the steps of the protection control method for the air conditioner according to any one of claims 1 to 8 are implemented.

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