Air conditioner dynamic control method and device in defrosting process and air conditioner

Abstract

The invention provides an air conditioner dynamic control method and device in the defrosting process and an air conditioner. The method comprises the steps that under the condition that the air conditioner is in a heating mode and enters a defrosting mode, the evaporator temperature is obtained to serve as the first target temperature, and the exhaust temperature is obtained to serve as the second target temperature; calculating an instantaneous drop rate of the second target temperature as a first target rate; and judging based on the first target temperature, the second target temperature and the first target rate in sequence, and controlling the air conditioner to enter a corresponding dynamic control mode according to a judgment result so as to regulate and control the opening degree of an electronic expansion valve and the frequency of a compressor. According to the method, by dynamically adjusting the opening degree of the electronic expansion valve and the frequency of the compressor, the defrosting effect is effectively optimized, the air conditioner heating efficiency is improved, and the problem that in the prior art, control based on the frequency of the compressor cannot guarantee that the frequencies of the electronic expansion valve and the compressor change along with the real-time state of the air conditioner in the defrosting process is solved. And the defrosting effect is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning control, and in particular to a method, device, computer-readable storage medium and air conditioner for dynamic control of an air conditioner during a defrosting process. Background Art

[0002] In air conditioning systems, especially heat pump systems, the outdoor heat exchanger (condenser) often frosts due to humidity and low temperature during winter operation. Frosting affects heat exchange efficiency and reduces heating capacity, so regular defrosting is required. Traditional defrosting methods, such as stopping the system for defrosting or defrosting by changing the air conditioning mode (such as switching from heating to cooling), not only cause significant fluctuations in indoor temperature and affect user experience, but also the frequent start-up and shutdown of the compressor during the defrosting process will increase energy consumption and equipment wear.

[0003] In view of the above problems, patent CN107576105B proposes a control method for improving the defrost cycle, wherein the patent adjusts the logic in the defrost process, and when the air conditioner is running in the heating mode, it determines whether to stop and enter the defrost mode according to the frequency of the compressor. Specifically, if the frequency of the compressor is higher than the first predetermined frequency, the system will stop for defrosting, otherwise it will directly enter the defrost mode without stopping.

[0004] However, this method stops the compressor when the frequency is high, which will cause the compressor to take a long time to increase the frequency when it is restarted, thereby prolonging the ineffective heating time. In addition, for variable frequency air conditioners, directly switching modes after defrosting can cause compressor control to lose step, causing quality problems, and insufficient control of parameters during the defrosting process limits the improvement of defrosting efficiency.

[0005] Therefore, the conventional defrosting method in the prior art improves the defrosting efficiency by simply adjusting the compressor operating state and mode switching time, but the following problems still exist in practical applications:

[0006] 1. The frequency adjustment efficiency of the compressor during the defrosting process is low, which affects the defrosting speed and the heating performance of the whole machine.

[0007] 2. Lack of effective control over key parameters in the defrosting process (such as electronic expansion valve opening, refrigerant flow, and exhaust temperature) cannot ensure the rapid and efficient defrosting process.

[0008] 3. The liquid hammer problem that may be caused by liquid refrigerant entering the compressor during the defrosting process was not taken into consideration, and the compressor was not adequately protected.

[0009] In summary, there is an urgent need in the prior art for a method that can effectively control key parameters in the defrosting process to achieve a fast and efficient defrosting process and ensure the reliability of the air conditioner. Summary of the invention

[0010] The main purpose of the present application is to provide a method, device, computer-readable storage medium and air conditioner for dynamic control of air conditioning during the defrosting process, so as to at least solve the problem in the prior art that control based on the compressor frequency during the defrosting process cannot ensure that the frequencies of the electronic expansion valve and the compressor follow the real-time state changes of the air conditioner, resulting in a decrease in the defrosting effect.

[0011] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for dynamic control of an air conditioner during a defrost process is provided, comprising: when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining the instantaneous rate of decrease of the second target temperature to obtain a first target rate; making judgments based on the first target temperature, the second target temperature and the first target rate in sequence, and controlling the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to regulate the opening of the electronic expansion valve of the air conditioner and the frequency of the compressor.

[0012] Optionally, judgments are made based on the first target temperature, the second target temperature and the first target rate in sequence, and the air conditioner is controlled to enter a corresponding dynamic control mode according to the judgment results, including: comparing the first target temperature with the first preset temperature, and when the first target temperature is greater than the first preset temperature, comparing the second target temperature with the second preset temperature, the first preset temperature being less than the second preset temperature; if the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature, reducing the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than a first threshold value and increasing the frequency of the compressor by a first preset step; if the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0013] Optionally, after comparing the first target temperature with the first preset temperature, the method further includes: when the first target temperature is less than or equal to the first preset temperature, comparing the first target temperature with the third preset temperature, and when the first target temperature is greater than the third preset temperature, comparing the second target temperature with the second preset temperature, the third preset temperature being less than the first preset temperature; if the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature, reducing the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than the first threshold value and the frequency of the compressor is maintained unchanged.

[0014] Optionally, after comparing the second target temperature with the second preset temperature, the method further includes: when the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate; if the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at the second preset rate and maintaining the frequency of the compressor unchanged; if the first target rate is less than or equal to the first preset rate, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0015] Optionally, after comparing the first target temperature with the third preset temperature, the method further includes: when the first target temperature is less than or equal to the third preset temperature, comparing the second target temperature with the second preset temperature; if the second target temperature is less than the second preset temperature, increasing the opening of the electronic expansion valve at a third preset rate and maintaining the frequency of the compressor unchanged.

[0016] Optionally, after comparing the second target temperature with the second preset temperature, the method further includes: when the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate; if the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at the second preset rate and reducing the frequency of the compressor by a first preset step; if the first target rate is less than or equal to the first preset rate, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0017] Optionally, after controlling the air conditioner to enter the corresponding dynamic control mode according to the judgment result, the method also includes: real-time monitoring the current change rate of the air conditioner to obtain a second target rate; comparing the first target rate with the first preset rate and comparing the second target rate with the fourth preset rate; if the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate, recording the opening of the electronic expansion valve and the frequency of the compressor at the current moment to obtain the target operating condition; based on the target operating condition, reducing the opening of the electronic expansion valve and reducing the frequency of the compressor at the fifth preset rate until the second target rate is less than the sixth preset rate, and controlling the air conditioner to return to the target operating condition.

[0018] According to another aspect of the present application, a dynamic control device for an air conditioner during a defrost process is provided, the device comprising: an acquisition unit, for acquiring the evaporator temperature of the air conditioner to obtain a first target temperature, acquiring the exhaust temperature of the air conditioner to obtain a second target temperature, and acquiring an instantaneous rate of decrease of the second target temperature to obtain a first target rate when the air conditioner is in a heating mode and has entered a defrost mode; a first control unit, for making judgments based on the first target temperature, the second target temperature and the first target rate in sequence, and controlling the air conditioner to enter a corresponding dynamic control mode according to the judgment result, so as to regulate the opening of the electronic expansion valve of the air conditioner and the frequency of the compressor.

[0019] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0020] According to another aspect of the present application, an air conditioner is provided, comprising: one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the described methods.

[0021] Applying the technical solution of the present application, in the above-mentioned air conditioner dynamic control method during the defrosting process, first, when the air conditioner is in the heating mode and has entered the defrosting mode, the evaporator temperature of the air conditioner is obtained to obtain the first target temperature, the exhaust temperature of the air conditioner is obtained to obtain the second target temperature, the instantaneous rate of decrease of the second target temperature is obtained to obtain the first target rate; then, judgments are made based on the first target temperature, the second target temperature and the first target rate in turn, and the air conditioner is controlled to enter the corresponding dynamic control mode according to the judgment result, so as to regulate the opening of the electronic expansion valve of the air conditioner and the frequency of the compressor. The present application dynamically adjusts the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner during the defrosting process, effectively avoiding the problem of the evaporator temperature being too low or too high during the defrosting process, and improving the defrosting efficiency and the comfort of the air conditioner. Through real-time monitoring and intelligent adjustment, this method can not only respond quickly to environmental changes and ensure the efficient defrosting process, but also effectively reduce energy consumption and extend the service life of the air conditioner, providing users with a more intelligent, energy-saving and comfortable user experience. It solves the problem in the prior art that during the defrosting process, the control based on the compressor frequency cannot ensure that the frequency of the electronic expansion valve and the compressor follows the real-time state changes of the air conditioner, resulting in a decrease in the defrosting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic flow chart of a method for dynamically controlling an air conditioner during a defrosting process provided in accordance with an embodiment of the present application is shown;

[0023] Figure 2 A control logic diagram of a dynamic control mode provided according to an embodiment of the present application is shown;

[0024] Figure 3 A control logic diagram of the diagnosis and protection of liquid hammer phenomenon provided according to an embodiment of the present application is shown;

[0025] Figure 4A structural block diagram of an air conditioning dynamic control device during a defrosting process provided according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0028] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] As introduced in the background technology, there is an urgent need in the prior art for a method that can effectively control key parameters in the defrost process to achieve a fast and efficient defrost process and ensure the reliability of the air conditioner. In order to solve the problem in the prior art that control based on the compressor frequency during the defrost process cannot ensure that the frequencies of the electronic expansion valve and the compressor follow the real-time state changes of the air conditioner, resulting in a decrease in the defrost effect, the embodiments of the present application provide a method, device, computer-readable storage medium and air conditioner for dynamic control of the air conditioner during the defrost process.

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0031] In this embodiment, a method for dynamic control of air conditioning during the defrosting process running on a mobile terminal, a computer terminal or a similar computing device is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 FIG. 1 is a flow chart of a method for dynamically controlling an air conditioner during defrosting according to an embodiment of the present application. Figure 1 As shown, the method comprises the following steps:

[0033] Step S201, when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining an instantaneous decreasing rate of the second target temperature to obtain a first target rate;

[0034] Specifically, the evaporator temperature (T 蒸发 ), get the first target temperature. In the defrost mode, the evaporator temperature will change due to the defrost process, so it is necessary to obtain this temperature in real time. It is mainly used to reflect the defrost temperature range that needs to be reached or maintained, and to guide the subsequent adjustment of the electronic expansion valve and compressor frequency. Get the exhaust temperature and get the second target temperature, the exhaust temperature (T 排 ) reflects the working state of the compressor and the refrigerant temperature in the system, and has a direct impact on the defrosting efficiency. It aims to control the exhaust temperature by adjusting the compressor frequency and the opening of the electronic expansion valve to achieve the purpose of optimizing defrosting and preventing equipment damage. The instantaneous drop rate is calculated based on the second target temperature to obtain the above-mentioned first target rate (V), which is used to reflect the changes in heat exchange efficiency and refrigerant flow during the defrosting process, and is used to guide the adjustment of the opening of the electronic expansion valve to ensure the rapid recovery of the evaporator temperature, thereby accelerating the defrosting process.

[0035] Step S202, makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to adjust the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0036] Specifically, different control modes are entered according to the range of the evaporator temperature, and different sub-modes are further entered according to the second target temperature in different control modes. Then, the operating status of the refrigerant and the load is determined in combination with the above-mentioned first target rate, and then the frequency of the compressor and the opening of the electronic expansion valve are adjusted to perform defrosting.

[0037] In the above embodiment, the present application optimizes the defrosting efficiency and system reliability by adjusting the key parameters in the defrosting process, namely, the opening of the electronic expansion valve and the frequency of the compressor. Through the above logic, the system can flexibly adjust the key parameters in the defrosting process to ensure that the defrosting is both fast and safe, avoiding the inefficiency and equipment damage risks that may exist in the traditional defrosting control method, and improving the heating performance of the air conditioner in a low temperature environment and the user comfort.

[0038] Through this embodiment, first, when the air conditioner is in the heating mode and has entered the defrosting mode, the evaporator temperature of the air conditioner is obtained to obtain the first target temperature, the exhaust temperature of the air conditioner is obtained to obtain the second target temperature, the instantaneous rate of decrease of the second target temperature is obtained to obtain the first target rate; then, judgment is made based on the first target temperature, the second target temperature and the first target rate in turn, and the air conditioner is controlled to enter the corresponding dynamic control mode according to the judgment result, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner. The present application dynamically adjusts the opening of the electronic expansion valve and the compressor frequency of the air conditioner during the defrosting process, effectively avoiding the problem of the evaporator temperature being too low or too high during the defrosting process, and improving the defrosting efficiency and the comfort of the air conditioner. This method can not only respond to environmental changes quickly and ensure the efficient defrosting process through real-time monitoring and intelligent adjustment, but also effectively reduce energy consumption and extend the service life of the air conditioner, providing users with a more intelligent, energy-saving and comfortable use experience, and solving the problem that the control based on the compressor frequency during the defrosting process in the prior art cannot ensure that the frequency of the electronic expansion valve and the compressor follows the real-time state change of the air conditioner, resulting in a decrease in the defrosting effect.

[0039] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, as Figure 2 As shown, the above step S202 includes:

[0040] Step S2021, comparing the first target temperature with the first preset temperature, and if the first target temperature is greater than the first preset temperature, comparing the second target temperature with the second preset temperature, and the first preset temperature is less than the second preset temperature;

[0041] Specifically, the evaporator temperature is first compared with a first preset temperature (recommended value range -10°C to 0°C), and when the evaporator temperature is greater than the first preset temperature, the exhaust temperature is further compared with a second preset temperature (recommended value range 45°C to 65°C).

[0042] In a specific implementation, assuming that the first preset temperature is -10°C and the current first target temperature is -8°C, if the first target temperature is greater than the first preset temperature, the second target temperature will continue to be compared with the second preset temperature.

[0043] Step S2022, if the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature, reducing the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than a first threshold value and increasing the frequency of the compressor by a first preset step;

[0044] In a specific implementation, assuming that the second preset temperature is 50°C, and the above-mentioned first preset temperature is -10°C, and the above-mentioned first target temperature is -8°C, and the above-mentioned second target temperature is 40°C, then the above-mentioned first target temperature is greater than the above-mentioned first preset temperature and the above-mentioned second target temperature is less than the above-mentioned second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, reduces the opening of the above-mentioned electronic expansion valve until the difference between the above-mentioned second target temperature and the above-mentioned second preset temperature is less than the first threshold value (the recommended value range is ±2°C) and increases the frequency of the above-mentioned compressor by the first preset step (the recommended value range is: 3~5Hz).

[0045] It can be understood that the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature, indicating that the evaporator low pressure is high, the refrigerant flow is large, but the exhaust temperature is low. In order to prevent a large amount of refrigerant from entering the compressor in a short period of time to cause liquid hammer, and at the same time to increase the exhaust temperature and increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed, the present application is set to reduce the opening of the electronic expansion valve and increase the compressor frequency.

[0046] Step S2023: if the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature, the opening of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

[0047] In a specific implementation, assuming that the second preset temperature is 50°C, and the above-mentioned first preset temperature is -10°C, and the above-mentioned first target temperature is -8°C, and the above-mentioned second target temperature is 60°C, then the above-mentioned first target temperature is greater than the above-mentioned first preset temperature and the above-mentioned second target temperature is greater than or equal to the above-mentioned second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, maintaining the opening of the above-mentioned electronic expansion valve and the frequency of the above-mentioned compressor unchanged.

[0048] It can be understood that the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature, which means that the low pressure of the evaporator is higher, the refrigerant flow rate is larger and the exhaust temperature is higher. The current defrosting speed is already faster and no intervention is required. It is more appropriate to maintain the electronic expansion valve opening and compressor frequency initially set by the air conditioner.

[0049] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, as Figure 2 As shown, after comparing the first target temperature with the first preset temperature, the method further includes:

[0050] Step S301, when the first target temperature is less than or equal to the first preset temperature, comparing the first target temperature with the third preset temperature, and when the first target temperature is greater than the third preset temperature, comparing the second target temperature with the second preset temperature, the third preset temperature is less than the first preset temperature;

[0051] Specifically, when the above-mentioned first target temperature is less than or equal to the above-mentioned first preset temperature, the evaporator temperature is first further compared with the third preset temperature (recommended value range -20℃~-15℃), and when the evaporator temperature is greater than the above-mentioned third preset temperature, the exhaust temperature is further compared with the second preset temperature (recommended value range 45℃~65℃).

[0052] In a specific implementation, assuming that the first preset temperature is -15°C and the current first target temperature is -13°C, the first target temperature satisfies the condition that it is less than the first preset temperature and greater than the third preset temperature, and the second target temperature is then compared with the second preset temperature.

[0053] Step S302, if the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature, the opening of the electronic expansion valve is reduced until the difference between the second target temperature and the second preset temperature is less than the first threshold and the frequency of the compressor is maintained unchanged.

[0054] In a specific implementation, assuming that the second preset temperature is 50°C and the third preset temperature is -15°C, the first target temperature is -13°C and the second target temperature is 40°C, then the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, reduces the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than the first threshold value and maintains the frequency of the compressor unchanged.

[0055] It is understandable that the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature, indicating that the low pressure of the evaporator is medium, the flow rate of the refrigerant is medium, but the exhaust temperature is low. In order to increase the exhaust temperature, increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed. The present application is set to reduce the opening of the electronic expansion valve, and at the same time, in order to ensure that the refrigerant flow rate of the condenser defrosting continues to maintain a suitable state, the compressor frequency is kept unchanged.

[0056] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, as Figure 2 As shown, after comparing the second target temperature with the second preset temperature, the method further includes:

[0057] Step S401, when the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate;

[0058] Specifically, when the evaporator temperature is greater than the third preset temperature and less than or equal to the first preset temperature and the exhaust temperature is greater than the second preset temperature, the instantaneous drop rate of the exhaust temperature is compared with the first preset rate (recommended value range 10℃ / min~20℃ / min).

[0059] It can be understood that the above operation is to confirm that the exhaust temperature is high enough, and then further detect whether the instantaneous drop rate of the exhaust temperature exceeds the preset rate threshold to determine whether the evaporator temperature drops too fast during the defrosting process (indicating insufficient refrigerant flow).

[0060] Step S402, if the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at a second preset rate and maintaining the frequency of the compressor unchanged;

[0061] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, and the first target rate is greater than the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, increasing the opening of the electronic expansion valve at a second preset rate (the recommended value range is 2 steps / s to 10 steps / s) and maintaining the frequency of the compressor unchanged.

[0062] It can be understood that the above-mentioned first target rate is greater than the above-mentioned first preset rate, indicating that the low pressure of the evaporator is medium and the flow rate of the refrigerant is medium, but the exhaust temperature is high and the exhaust temperature drops rapidly, indicating that the flow rate of the refrigerant is rapidly decreasing, which is insufficient to support the purpose of rapid defrosting. In order to increase the refrigerant flow rate and speed up the defrosting speed, the present application is arranged to gradually increase the opening of the above-mentioned electronic expansion valve and maintain the frequency of the above-mentioned compressor unchanged.

[0063] Step S403: if the first target rate is less than or equal to the first preset rate, the opening of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

[0064] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 10°C / min, and the first target rate is less than or equal to the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0065] It can be understood that the first target rate is less than or equal to the first preset rate, indicating that the low pressure of the evaporator is medium, the flow rate of the refrigerant is medium, the exhaust temperature is high, and the exhaust temperature drops slowly, indicating that the refrigerant flow rate and the heat exchange temperature difference between the exhaust and the condenser are large, which can meet the purpose of rapid defrosting. The opening of the electronic expansion valve and the compressor frequency can maintain the initial design value of the program.

[0066] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, as Figure 2 As shown, after comparing the first target temperature with the third preset temperature, the method further includes:

[0067] Step S501, when the first target temperature is less than or equal to the third preset temperature, comparing the second target temperature with the second preset temperature;

[0068] Specifically, when the first target temperature is less than or equal to the third preset temperature, the exhaust temperature is compared with the second preset temperature (the recommended value range is 45° C. to 65° C.).

[0069] In a specific implementation, assuming that the first preset temperature is -15°C and the current first target temperature is -18°C, and the first target temperature is less than or equal to the third preset temperature, the second target temperature will continue to be compared with the second preset temperature.

[0070] Step S502: if the second target temperature is lower than the second preset temperature, the opening of the electronic expansion valve is increased at a third preset rate and the frequency of the compressor is maintained unchanged.

[0071] In a specific implementation, assuming that the second preset temperature is 50°C and the second target temperature is 40°C, the second target temperature is lower than the second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, the opening of the electronic expansion valve is increased at a third preset rate (the recommended value range is 10 steps / s to 30 steps / s) and the frequency of the compressor is maintained unchanged.

[0072] It is understandable that the second target temperature is lower than the second preset temperature, indicating that the low pressure of the evaporator is low, the flow rate of the refrigerant is small, and the exhaust temperature is low. In order to quickly increase the refrigerant flow rate, increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed, the opening of the electronic expansion valve can be quickly increased until the opening of the electronic expansion valve is opened to the maximum opening. At this time, in order to prevent the compressor motor from overheating and ensure that the refrigerant quickly flows back to the compressor from the condenser, the compressor operating frequency is the initial setting value.

[0073] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, as Figure 2 As shown, after comparing the second target temperature with the second preset temperature, the method further includes:

[0074] Step S601, when the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate;

[0075] Specifically, when the second target temperature is greater than or equal to the second preset temperature, the instantaneous drop rate of the exhaust temperature is compared with the first preset rate (the recommended value range is 10° C. / min to 20° C. / min).

[0076] It is understandable that, assuming that the second target temperature is 70°C and the second preset temperature is 45°C, the instantaneous drop rate of the exhaust temperature is detected to see whether it exceeds the preset rate threshold to determine whether the evaporator temperature drops too fast during the defrosting process.

[0077] Step S602, if the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at the second preset rate and reducing the frequency of the compressor by the first preset step;

[0078] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, and the first target rate is greater than the first preset rate, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, increasing the opening of the electronic expansion valve at a second preset rate (recommended value range 2 steps / s to 10 steps / s) and reducing the frequency of the compressor by the first preset step length (recommended value range 3Hz to 5Hz).

[0079] It is understandable that the above-mentioned first target rate is greater than the above-mentioned first preset rate, indicating that the low pressure of the evaporator is low, the flow rate of the refrigerant is small, the exhaust temperature is high, and the exhaust temperature drops quickly, indicating that the refrigerant flow rate is rapidly decreasing and is insufficient to support the purpose of rapid defrosting. In order to increase the refrigerant flow rate and speed up the defrosting speed, the opening of the electronic expansion valve can be gradually increased. For the compressor, running the compressor at a higher state is not helpful for defrosting and has high power consumption. In order to prevent the compressor motor from overheating and improve reliability and reduce power consumption, the compressor frequency can be reduced.

[0080] Step S603: if the first target rate is less than or equal to the first preset rate, the opening of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

[0081] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 10°C / min, and the first target rate is less than or equal to the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0082] It can be understood that the first target rate is less than or equal to the first preset rate, indicating that the low pressure of the evaporator is low, the exhaust temperature is high, and the exhaust temperature drops slowly, indicating that the refrigerant flow rate and the heat exchange temperature difference between the exhaust and the condenser are large, which can meet the purpose of rapid defrosting. The opening of the electronic expansion valve and the compressor frequency can maintain the initial design value.

[0083] In order to protect the air conditioner in the event of a liquid hammer phenomenon, in an optional implementation, after the air conditioner is controlled to enter a corresponding dynamic control mode according to the determination result, such as Figure 3 As shown, the above method also includes:

[0084] Step S701, real-time monitoring of the current change rate of the air conditioner to obtain a second target rate;

[0085] Specifically, the current change rate (second target rate) is monitored in real time. After the air conditioner is in the defrost mode and enters the dynamic control mode according to the determination results of the evaporator temperature and the compressor exhaust temperature, the air conditioner continues to monitor the current change rate in real time during the operation of the air conditioner. The monitoring of the current change rate is crucial for determining whether the compressor inhales liquid, because when the compressor inhales liquid, due to the incompressibility of the liquid refrigerant, the pressure in the compressor will suddenly increase, which is manifested as a sudden and substantial increase in current.

[0086] Step S702, comparing the first target rate with the first preset rate and comparing the second target rate with the fourth preset rate;

[0087] Specifically, the first target rate is compared with the first preset rate (recommended value range 10℃ / min~20℃ / min), which reflects the efficiency of the defrost process. If the first target rate is greater than the first preset rate, it means that the defrost process is too fast or the refrigerant flow in the system is too much, which may cause additional burden on the compressor. The second target rate is compared with the fourth preset rate (recommended value range 2A / s~4A / s) to reflect the operating status of the compressor. If the second target rate is greater than the fourth preset rate, it means that the compressor may be overloaded or liquid hammered, and immediate measures need to be taken to adjust it.

[0088] Step S703, if the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate, then the opening of the electronic expansion valve and the frequency of the compressor at the current moment are recorded to obtain a target operating condition;

[0089] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, the second target rate is 4A / s, and the fourth preset rate is 3A / s, and the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, records the opening of the electronic expansion valve and the frequency of the compressor at the current moment to obtain the target operating conditions.

[0090] It is understandable that it is necessary to determine whether the exhaust temperature drops too fast and whether the instantaneous current rises too fast. If the conditions are met, it means that the air is carrying liquid and liquid hammer occurs inside the compressor. At this time, emergency protection measures are taken, and since the protection measures are only for emergency treatment and cannot guarantee the efficiency of defrosting, the present application is set to record the current working conditions before taking the protection measures to obtain the target working conditions.

[0091] Step S704, based on the target operating condition, the opening of the electronic expansion valve is reduced and the frequency of the compressor is reduced at a fifth preset rate until the second target rate is less than a sixth preset rate, and the air conditioner is controlled to return to the target operating condition.

[0092] In a specific implementation, the opening of the electronic expansion valve is reduced based on the target working condition and the frequency of the compressor is reduced at the fifth preset rate until the second target rate is less than the sixth preset rate, that is, the opening of the electronic expansion valve is reduced to reduce the flow of the system. The compressor frequency is quickly reduced to reduce the operating current of the compressor to prevent the demagnetization of the compressor motor. And after the electronic expansion valve and the compressor frequency are adjusted, when the instantaneous current change is small, it means that the compressor liquid hammer phenomenon has been alleviated and this protection function can be exited.

[0093] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0094] The embodiment of the present application also provides an air conditioning dynamic control device during the defrosting process. It should be noted that the air conditioning dynamic control device during the defrosting process of the embodiment of the present application can be used to execute the air conditioning dynamic control method for the defrosting process provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0095] The following is an introduction to the air conditioning dynamic control device during the defrosting process provided in an embodiment of the present application.

[0096] Figure 4 is a structural block diagram of an air conditioning dynamic control device during the defrosting process according to an embodiment of the present application. Figure 4 As shown, the device comprises:

[0097] The acquisition unit 10 is used to acquire the evaporator temperature of the air conditioner to obtain the first target temperature, acquire the exhaust temperature of the air conditioner to obtain the second target temperature, acquire the instantaneous decreasing rate of the second target temperature to obtain the first target rate when the air conditioner is in the heating mode and has entered the defrosting mode;

[0098] Specifically, the evaporator temperature (T 蒸发), get the first target temperature. In the defrost mode, the evaporator temperature will change due to the defrost process, so it is necessary to obtain this temperature in real time. It is mainly used to reflect the defrost temperature range that needs to be reached or maintained, and to guide the subsequent adjustment of the electronic expansion valve and compressor frequency. Get the exhaust temperature and get the second target temperature, the exhaust temperature (T 排 ) reflects the working state of the compressor and the refrigerant temperature in the system, and has a direct impact on the defrosting efficiency. It aims to control the exhaust temperature by adjusting the compressor frequency and the opening of the electronic expansion valve to achieve the purpose of optimizing defrosting and preventing equipment damage. The instantaneous drop rate is calculated based on the first target temperature to obtain the above-mentioned first target rate (V), which is used to reflect the changes in heat exchange efficiency and refrigerant flow during the defrosting process, and is used to guide the adjustment of the opening of the electronic expansion valve to ensure the rapid recovery of the evaporator temperature, thereby accelerating the defrosting process.

[0099] The first control unit 20 is used to make judgments based on the first target temperature, the second target temperature and the first target rate in sequence, and control the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0100] Specifically, different control modes are entered according to the range of the evaporator temperature, and different sub-modes are further entered according to the second target temperature in different control modes. Then, the operating status of the refrigerant and the load is determined in combination with the above-mentioned first target rate, and then the frequency of the compressor and the opening of the electronic expansion valve are adjusted to perform defrosting.

[0101] In the above embodiment, the present application optimizes the defrosting efficiency and system reliability by adjusting the key parameters in the defrosting process, namely, the opening of the electronic expansion valve and the frequency of the compressor. Through the above logic, the system can flexibly adjust the key parameters in the defrosting process to ensure that the defrosting is both fast and safe, avoiding the inefficiency and equipment damage risks that may exist in the traditional defrosting control method, and improving the heating performance of the air conditioner in a low temperature environment and the user comfort.

[0102] Through this embodiment, when the air conditioner is in the heating mode and has entered the defrosting mode, the acquisition unit acquires the evaporator temperature of the air conditioner to obtain the first target temperature, acquires the exhaust temperature of the air conditioner to obtain the second target temperature, acquires the instantaneous rate of decrease of the second target temperature to obtain the first target rate; the first control unit makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter the corresponding dynamic control mode according to the judgment result, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner. The present application dynamically adjusts the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner during the defrosting process, effectively avoiding the problem of the evaporator temperature being too low or too high during the defrosting process, and improving the defrosting efficiency and the comfort of the air conditioner. This method can not only respond to environmental changes quickly and ensure the efficient defrosting process through real-time monitoring and intelligent adjustment, but also effectively reduce energy consumption and extend the service life of the air conditioner, providing users with a more intelligent, energy-saving and comfortable use experience, and solving the problem that the control based on the compressor frequency during the defrosting process in the prior art cannot ensure that the frequency of the electronic expansion valve and the compressor follows the real-time state change of the air conditioner, resulting in a decrease in the defrosting effect.

[0103] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, the first control unit includes:

[0104] a comparison module, configured to compare the first target temperature with the first preset temperature, and when the first target temperature is greater than the first preset temperature, compare the second target temperature with the second preset temperature, and the first preset temperature is less than the second preset temperature;

[0105] Specifically, the evaporator temperature is first compared with a first preset temperature (recommended value range -10°C to 0°C), and when the evaporator temperature is greater than the first preset temperature, the exhaust temperature is further compared with a second preset temperature (recommended value range 45°C to 65°C).

[0106] In a specific implementation, assuming that the first preset temperature is -10°C and the current first target temperature is -8°C, if the first target temperature is greater than the first preset temperature, the second target temperature will continue to be compared with the second preset temperature.

[0107] a first control module, configured to reduce the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than a first threshold value and increase the frequency of the compressor by a first preset step if the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature;

[0108] In a specific implementation, assuming that the second preset temperature is 50°C, and the above-mentioned first preset temperature is -10°C, and the above-mentioned first target temperature is -8°C, and the above-mentioned second target temperature is 40°C, then the above-mentioned first target temperature is greater than the above-mentioned first preset temperature and the above-mentioned second target temperature is less than the above-mentioned second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, reduces the opening of the above-mentioned electronic expansion valve until the difference between the above-mentioned second target temperature and the above-mentioned second preset temperature is less than the first threshold value (the recommended value range is ±2°C) and increases the frequency of the above-mentioned compressor by the first preset step (the recommended value range is: 3~5Hz).

[0109] It can be understood that the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature, indicating that the evaporator low pressure is high, the refrigerant flow is large, but the exhaust temperature is low. In order to prevent a large amount of refrigerant from entering the compressor in a short period of time to cause liquid hammer, and at the same time to increase the exhaust temperature and increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed, the present application is set to reduce the opening of the electronic expansion valve and increase the compressor frequency.

[0110] The second control module is used to maintain the opening of the electronic expansion valve and the frequency of the compressor unchanged if the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature.

[0111] In a specific implementation, assuming that the second preset temperature is 50°C, and the above-mentioned first preset temperature is -10°C, and the above-mentioned first target temperature is -8°C, and the above-mentioned second target temperature is 60°C, then the above-mentioned first target temperature is greater than the above-mentioned first preset temperature and the above-mentioned second target temperature is greater than or equal to the above-mentioned second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, maintaining the opening of the above-mentioned electronic expansion valve and the frequency of the above-mentioned compressor unchanged.

[0112] It can be understood that the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature, which means that the low pressure of the evaporator is higher, the refrigerant flow rate is larger and the exhaust temperature is higher. The current defrosting speed is already faster and no intervention is required. It is more appropriate to maintain the electronic expansion valve opening and compressor frequency initially set by the air conditioner.

[0113] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, the device further includes:

[0114] a first comparison unit, configured to compare the first target temperature with the first preset temperature, if the first target temperature is less than or equal to the first preset temperature, based on the first target temperature, with a third preset temperature, and if the first target temperature is greater than the third preset temperature, based on the second target temperature, with the second preset temperature being less than the first preset temperature;

[0115] Specifically, when the above-mentioned first target temperature is less than or equal to the above-mentioned first preset temperature, the evaporator temperature is first further compared with the third preset temperature (recommended value range -20℃~-15℃), and when the evaporator temperature is greater than the above-mentioned third preset temperature, the exhaust temperature is further compared with the second preset temperature (recommended value range 45℃~65℃).

[0116] In a specific implementation, assuming that the first preset temperature is -15°C and the current first target temperature is -13°C, the first target temperature satisfies the condition that it is less than the first preset temperature and greater than the third preset temperature, and the second target temperature is then compared with the second preset temperature.

[0117] The second control unit is used to reduce the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than the first threshold value and the frequency of the compressor is maintained unchanged if the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature.

[0118] In a specific implementation, assuming that the second preset temperature is 50°C and the third preset temperature is -15°C, the first target temperature is -13°C and the second target temperature is 40°C, then the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, reduces the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than the first threshold value and maintains the frequency of the compressor unchanged.

[0119] It is understandable that the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature, indicating that the low pressure of the evaporator is medium, the flow rate of the refrigerant is medium, but the exhaust temperature is low. In order to increase the exhaust temperature, increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed. The present application is set to reduce the opening of the electronic expansion valve, and at the same time, in order to ensure that the refrigerant flow rate of the condenser defrosting continues to maintain a suitable state, the compressor frequency is kept unchanged.

[0120] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, after comparing the second target temperature with the second preset temperature, the method further includes:

[0121] a second comparing unit, configured to compare the first target rate with the first preset rate after comparing the second target temperature with the second preset temperature, if the second target temperature is greater than or equal to the second preset temperature;

[0122] Specifically, when the evaporator temperature is greater than the third preset temperature and less than or equal to the first preset temperature and the exhaust temperature is greater than the second preset temperature, the instantaneous drop rate of the exhaust temperature is compared with the first preset rate (recommended value range 10℃ / min~20℃ / min).

[0123] It can be understood that the above operation is to confirm that the exhaust temperature is high enough, and then further detect whether the instantaneous drop rate of the exhaust temperature exceeds the preset rate threshold to determine whether the evaporator temperature drops too fast during the defrosting process (indicating insufficient refrigerant flow).

[0124] a third control unit, configured to increase the opening of the electronic expansion valve at a second preset rate and maintain the frequency of the compressor unchanged if the first target rate is greater than the first preset rate;

[0125] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, and the first target rate is greater than the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, increasing the opening of the electronic expansion valve at a second preset rate (the recommended value range is 2 steps / s to 10 steps / s) and maintaining the frequency of the compressor unchanged.

[0126] It can be understood that the above-mentioned first target rate is greater than the above-mentioned first preset rate, indicating that the low pressure of the evaporator is medium and the flow rate of the refrigerant is medium, but the exhaust temperature is high and the exhaust temperature drops rapidly, indicating that the flow rate of the refrigerant is rapidly decreasing, which is insufficient to support the purpose of rapid defrosting. In order to increase the refrigerant flow rate and speed up the defrosting speed, the present application is arranged to gradually increase the opening of the above-mentioned electronic expansion valve and maintain the frequency of the above-mentioned compressor unchanged.

[0127] The fourth control unit is used to maintain the opening of the electronic expansion valve and the frequency of the compressor unchanged if the first target rate is less than or equal to the first preset rate.

[0128] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 10°C / min, and the first target rate is less than or equal to the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0129] It can be understood that the first target rate is less than or equal to the first preset rate, indicating that the low pressure of the evaporator is medium, the flow rate of the refrigerant is medium, the exhaust temperature is high, and the exhaust temperature drops slowly, indicating that the refrigerant flow rate and the heat exchange temperature difference between the exhaust and the condenser are large, which can meet the purpose of rapid defrosting. The opening of the electronic expansion valve and the compressor frequency can maintain the initial design value of the program.

[0130] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, the device further includes:

[0131] a third comparing unit, configured to compare the second target temperature with the second preset temperature based on the comparison between the first target temperature and the third preset temperature, if the first target temperature is less than or equal to the third preset temperature;

[0132] Specifically, when the first target temperature is less than or equal to the third preset temperature, the exhaust temperature is compared with the second preset temperature (the recommended value range is 45° C. to 65° C.).

[0133] In a specific implementation, assuming that the first preset temperature is -15°C and the current first target temperature is -18°C, and the first target temperature is less than or equal to the third preset temperature, the second target temperature will continue to be compared with the second preset temperature.

[0134] The fifth control unit is used to increase the opening of the electronic expansion valve at a third preset rate and maintain the frequency of the compressor unchanged if the second target temperature is lower than the second preset temperature.

[0135] In a specific implementation, assuming that the second preset temperature is 50°C and the second target temperature is 40°C, the second target temperature is lower than the second preset temperature. At this time, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, the opening of the electronic expansion valve is increased at a third preset rate (the recommended value range is 10 steps / s to 30 steps / s) and the frequency of the compressor is maintained unchanged.

[0136] It is understandable that the second target temperature is lower than the second preset temperature, indicating that the low pressure of the evaporator is low, the flow rate of the refrigerant is small, and the exhaust temperature is low. In order to quickly increase the refrigerant flow rate, increase the heat exchange temperature difference between the exhaust temperature and the condenser, and speed up the defrosting speed, the opening of the electronic expansion valve can be quickly increased until the opening of the electronic expansion valve is opened to the maximum opening. At this time, in order to prevent the compressor motor from overheating and ensure that the refrigerant quickly flows back to the compressor from the condenser, the compressor operating frequency is the initial setting value.

[0137] In order to achieve flexible adjustment of the electronic expansion valve and the compressor, in an optional implementation, the device further includes:

[0138] a fourth comparing unit, configured to compare the first target rate with the first preset rate based on the comparison between the second target temperature and the second preset temperature, if the second target temperature is greater than or equal to the second preset temperature;

[0139] Specifically, when the second target temperature is greater than or equal to the second preset temperature, the instantaneous drop rate of the exhaust temperature is compared with the first preset rate (the recommended value range is 10° C. / min to 20° C. / min).

[0140] It is understandable that, assuming that the second target temperature is 70°C and the second preset temperature is 45°C, the instantaneous drop rate of the exhaust temperature is detected to see whether it exceeds the preset rate threshold to determine whether the evaporator temperature drops too fast during the defrosting process.

[0141] a sixth control unit, configured to increase the opening of the electronic expansion valve at the second preset rate and reduce the frequency of the compressor by the first preset step if the first target rate is greater than the first preset rate;

[0142] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, and the first target rate is greater than the first preset rate, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, increasing the opening of the electronic expansion valve at a second preset rate (recommended value range 2 steps / s to 10 steps / s) and reducing the frequency of the compressor by the first preset step length (recommended value range 3Hz to 5Hz).

[0143] It is understandable that the above-mentioned first target rate is greater than the above-mentioned first preset rate, indicating that the low pressure of the evaporator is low, the flow rate of the refrigerant is small, the exhaust temperature is high, and the exhaust temperature drops quickly, indicating that the refrigerant flow rate is rapidly decreasing and is insufficient to support the purpose of rapid defrosting. In order to increase the refrigerant flow rate and speed up the defrosting speed, the opening of the electronic expansion valve can be gradually increased. For the compressor, running the compressor at a higher state is not helpful for defrosting and has high power consumption. In order to prevent the compressor motor from overheating and improve reliability and reduce power consumption, the compressor frequency can be reduced.

[0144] The seventh control unit is used to maintain the opening of the electronic expansion valve and the frequency of the compressor unchanged if the first target rate is less than or equal to the first preset rate.

[0145] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 10°C / min, and the first target rate is less than or equal to the first preset rate, the air conditioner adopts a corresponding control strategy based on the judgment result, that is, maintaining the opening of the electronic expansion valve and the frequency of the compressor unchanged.

[0146] It can be understood that the first target rate is less than or equal to the first preset rate, indicating that the low pressure of the evaporator is low, the exhaust temperature is high, and the exhaust temperature drops slowly, indicating that the refrigerant flow rate and the heat exchange temperature difference between the exhaust and the condenser are large, which can meet the purpose of rapid defrosting. The opening of the electronic expansion valve and the compressor frequency can maintain the initial design value.

[0147] In order to protect the air conditioner in the event of liquid hammer, in an optional embodiment, the device further comprises:

[0148] A monitoring unit, configured to monitor the current change rate of the air conditioner in real time to obtain a second target rate after controlling the air conditioner to enter a corresponding dynamic control mode according to the determination result;

[0149] Specifically, the current change rate (second target rate) is monitored in real time. After the air conditioner is in the defrost mode and enters the dynamic control mode according to the determination results of the evaporator temperature and the compressor exhaust temperature, the air conditioner continues to monitor the current change rate in real time during the operation of the air conditioner. The monitoring of the current change rate is crucial for determining whether the compressor inhales liquid, because when the compressor inhales liquid, due to the incompressibility of the liquid refrigerant, the pressure in the compressor will suddenly increase, which is manifested as a sudden and substantial increase in current.

[0150] a fifth comparison unit, configured to compare the first target rate with the first preset rate and to compare the second target rate with the fourth preset rate;

[0151] Specifically, the first target rate is compared with the first preset rate (recommended value range 10℃ / min~20℃ / min), which reflects the efficiency of the defrost process. If the first target rate is greater than the first preset rate, it means that the defrost process is too fast or the refrigerant flow in the system is too much, which may cause additional burden on the compressor. The second target rate is compared with the fourth preset rate (recommended value range 2A / s~4A / s) to reflect the operating status of the compressor. If the second target rate is greater than the fourth preset rate, it means that the compressor may be overloaded or liquid hammered, and immediate measures need to be taken to adjust it.

[0152] an eighth control unit, configured to record the opening degree of the electronic expansion valve and the frequency of the compressor at the current moment to obtain a target operating condition if the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate;

[0153] In a specific implementation, assuming that the first preset rate is 15°C / min, the first target rate is 25°C / min, the second target rate is 4A / s, and the fourth preset rate is 3A / s, and the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate, the air conditioner adopts a corresponding control strategy according to the judgment result, that is, records the opening of the electronic expansion valve and the frequency of the compressor at the current moment to obtain the target operating conditions.

[0154] It is understandable that it is necessary to determine whether the exhaust temperature drops too fast and whether the instantaneous current rises too fast. If the conditions are met, it means that the air is carrying liquid and liquid hammer occurs inside the compressor. At this time, emergency protection measures are taken, and since the protection measures are only for emergency treatment and cannot guarantee the efficiency of defrosting, the present application is set to record the current working conditions before taking the protection measures to obtain the target working conditions.

[0155] A ninth control unit is used to reduce the opening of the electronic expansion valve based on the target operating condition and reduce the frequency of the compressor at a fifth preset rate until the second target rate is less than a sixth preset rate, thereby controlling the air conditioner to return to the target operating condition.

[0156] In a specific implementation, the opening of the electronic expansion valve is reduced based on the target working condition and the frequency of the compressor is reduced at the fifth preset rate until the second target rate is less than the sixth preset rate, that is, the opening of the electronic expansion valve is reduced to reduce the flow of the system. The compressor frequency is quickly reduced to reduce the operating current of the compressor to prevent the demagnetization of the compressor motor. And after the electronic expansion valve and the compressor frequency are adjusted, when the instantaneous current change is small, it means that the compressor liquid hammer phenomenon has been alleviated and this protection function can be exited.

[0157] The air conditioner dynamic control device during the defrosting process includes a processor and a memory. The acquisition unit and the first control unit are stored in the memory as program units, and the processor executes the program units stored in the memory to implement corresponding functions. The modules are all located in the same processor; or, the modules are located in different processors in any combination.

[0158] The processor includes a kernel, which retrieves the corresponding program unit from the memory. One or more kernels can be set, and the defrosting efficiency can be improved by adjusting the kernel parameters.

[0159] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0160] An embodiment of the present invention provides a computer-readable storage medium, which includes a stored program, wherein when the program is running, the device where the computer-readable storage medium is located is controlled to execute the air conditioning dynamic control method during the defrosting process.

[0161] Specifically, the air conditioner dynamic control method during the defrosting process includes:

[0162] Step S201, when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining an instantaneous decreasing rate of the second target temperature to obtain a first target rate;

[0163] Step S202, makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to adjust the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0164] An embodiment of the present invention provides a processor, which is used to run a program, wherein the air-conditioning dynamic control method during the defrosting process is executed when the program is run.

[0165] Specifically, the air conditioner dynamic control method during the defrosting process includes:

[0166] Step S201, when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining an instantaneous decreasing rate of the second target temperature to obtain a first target rate;

[0167] Step S202, makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to adjust the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0168] An embodiment of the present invention provides an air conditioner, the air conditioner comprising a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0169] Step S201, when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining an instantaneous decreasing rate of the second target temperature to obtain a first target rate;

[0170] Step S202, makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to adjust the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0171] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0172] Step S201, when the air conditioner is in a heating mode and has entered a defrost mode, obtaining the evaporator temperature of the air conditioner to obtain a first target temperature, obtaining the exhaust temperature of the air conditioner to obtain a second target temperature, obtaining an instantaneous decreasing rate of the second target temperature to obtain a first target rate;

[0173] Step S202, makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to adjust the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

[0174] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order than here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0175] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0176] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0177] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0178] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0179] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0180] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0181] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0182] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0183] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0184] 1) The air conditioner dynamic control method in the defrosting process of the present application, first, when the air conditioner is in the heating mode and has entered the defrosting mode, the evaporator temperature of the air conditioner is obtained to obtain the first target temperature, the exhaust temperature of the air conditioner is obtained to obtain the second target temperature, the instantaneous rate of decrease of the second target temperature is obtained to obtain the first target rate; then, the determination is made based on the first target temperature, the second target temperature and the first target rate in turn, and the air conditioner is controlled to enter the corresponding dynamic control mode according to the determination result, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner. The present application dynamically adjusts the opening of the electronic expansion valve and the compressor frequency of the air conditioner during the defrosting process, effectively avoiding the problem of the evaporator temperature being too low or too high during the defrosting process, and improving the defrosting efficiency and the comfort of the air conditioner. This method can not only respond to environmental changes quickly and ensure the efficient defrosting process through real-time monitoring and intelligent adjustment, but also effectively reduce energy consumption and extend the service life of the air conditioner, providing users with a more intelligent, energy-saving and comfortable use experience, and solving the problem that the control based on the compressor frequency during the defrosting process in the prior art cannot ensure that the frequency of the electronic expansion valve and the compressor follows the real-time state change of the air conditioner, resulting in a decrease in the defrosting effect.

[0185] 2) The air conditioner dynamic control device in the defrosting process of the present application, the acquisition unit acquires the evaporator temperature of the air conditioner to obtain the first target temperature, acquires the exhaust temperature of the air conditioner to obtain the second target temperature, acquires the instantaneous rate of decrease of the second target temperature to obtain the first target rate when the air conditioner is in the heating mode and has entered the defrosting mode; the first control unit makes judgments based on the first target temperature, the second target temperature and the first target rate in turn, and controls the air conditioner to enter the corresponding dynamic control mode according to the judgment results, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner. The present application dynamically adjusts the opening of the electronic expansion valve and the compressor frequency of the air conditioner during the defrosting process, effectively avoiding the problem of the evaporator temperature being too low or too high during the defrosting process, and improving the defrosting efficiency and the comfort of the air conditioner. This method can not only respond to environmental changes quickly and ensure the efficient defrosting process through real-time monitoring and intelligent adjustment, but also effectively reduce energy consumption and extend the service life of the air conditioner, providing users with a more intelligent, energy-saving and comfortable use experience, and solving the problem that the control based on the compressor frequency during the defrosting process in the prior art cannot ensure that the frequency of the electronic expansion valve and the compressor follows the real-time state change of the air conditioner, resulting in a decrease in the defrosting effect.

[0186] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for dynamic control of air conditioning during defrosting, characterized in that: include: When the air conditioner is in a heating mode and has entered a defrost mode, the evaporator temperature of the air conditioner is obtained to obtain a first target temperature, the exhaust temperature of the air conditioner is obtained to obtain a second target temperature, and the instantaneous decreasing rate of the second target temperature is obtained to obtain a first target rate; Determinations are made based on the first target temperature, the second target temperature and the first target rate in sequence, and the air conditioner is controlled to enter a corresponding dynamic control mode according to the determination results to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

2. The method according to claim 1, characterized in that The method comprises: determining based on the first target temperature, the second target temperature and the first target rate in sequence, and controlling the air conditioner to enter a corresponding dynamic control mode according to the determination result, including: Based on the comparison between the first target temperature and a first preset temperature, and when the first target temperature is greater than the first preset temperature, based on the comparison between the second target temperature and a second preset temperature, the first preset temperature is less than the second preset temperature; If the first target temperature is greater than the first preset temperature and the second target temperature is less than the second preset temperature, reducing the opening of the electronic expansion valve until the difference between the second target temperature and the second preset temperature is less than a first threshold and increasing the frequency of the compressor by a first preset step; If the first target temperature is greater than the first preset temperature and the second target temperature is greater than or equal to the second preset temperature, the opening degree of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

3. The method according to claim 2, characterized in that After comparing the first target temperature with the first preset temperature, the method further includes: When the first target temperature is less than or equal to the first preset temperature, the first target temperature is compared with a third preset temperature, and when the first target temperature is greater than the third preset temperature, the second target temperature is compared with the second preset temperature, and the third preset temperature is less than the first preset temperature; If the first target temperature is greater than the third preset temperature and the second target temperature is less than the second preset temperature, the opening of the electronic expansion valve is reduced until the difference between the second target temperature and the second preset temperature is less than the first threshold and the frequency of the compressor is maintained unchanged.

4. The method according to claim 3, characterized in that After comparing the second target temperature with the second preset temperature, the method further includes: When the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate; If the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at a second preset rate and maintaining the frequency of the compressor unchanged; If the first target rate is less than or equal to the first preset rate, the opening degree of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

5. The method according to claim 4, characterized in that After comparing the first target temperature with the third preset temperature, the method further includes: When the first target temperature is less than or equal to the third preset temperature, comparing the second target temperature with the second preset temperature; If the second target temperature is lower than the second preset temperature, the opening of the electronic expansion valve is increased at a third preset rate and the frequency of the compressor is maintained unchanged.

6. The method according to claim 5, characterized in that After comparing the second target temperature with the second preset temperature, the method further includes: When the second target temperature is greater than or equal to the second preset temperature, comparing the first target rate with the first preset rate; If the first target rate is greater than the first preset rate, increasing the opening of the electronic expansion valve at the second preset rate and reducing the frequency of the compressor by the first preset step; If the first target rate is less than or equal to the first preset rate, the opening degree of the electronic expansion valve and the frequency of the compressor are maintained unchanged.

7. The method according to claim 1, characterized in that After controlling the air conditioner to enter a corresponding dynamic control mode according to the determination result, the method further includes: Real-time monitoring of the current change rate of the air conditioner to obtain a second target rate; comparing the first target rate with a first preset rate and comparing the second target rate with a fourth preset rate; If the first target rate is greater than the first preset rate and the second target rate is greater than the fourth preset rate, the opening degree of the electronic expansion valve and the frequency of the compressor at the current moment are recorded to obtain a target operating condition; Based on the target operating condition, the opening of the electronic expansion valve is reduced and the frequency of the compressor is reduced at a fifth preset rate until the second target rate is less than a sixth preset rate, and the air conditioner is controlled to return to the target operating condition.

8. An air conditioner dynamic control device during defrosting, characterized in that: The device comprises: an acquisition unit, configured to, when the air conditioner is in a heating mode and has entered a defrost mode, acquire an evaporator temperature of the air conditioner to obtain a first target temperature, acquire an exhaust temperature of the air conditioner to obtain a second target temperature, acquire an instantaneous decreasing rate of the second target temperature to obtain a first target rate; The first control unit is used to make judgments based on the first target temperature, the second target temperature and the first target rate in sequence, and control the air conditioner to enter a corresponding dynamic control mode according to the judgment results, so as to regulate the opening of the electronic expansion valve and the frequency of the compressor of the air conditioner.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. An air conditioner, characterized in that: include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 7.

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