Air conditioner expansion valve control method and device and air conditioner

Abstract

The invention discloses an expansion valve control method and device of an air conditioner and the air conditioner, and relates to the technical field of air conditioners, and the expansion valve control method of the air conditioner comprises the steps that after the air conditioner is started and runs for a first preset duration, the current running mode of the air conditioner is monitored; if the operation mode is any one of a refrigeration mode, a heating mode and a dehumidification mode, the exhaust temperature of a compressor is monitored, and protection control is conducted on the opening degree of an expansion valve according to the exhaust temperature; and detecting the temperature of an inner disc, and performing protection control on the expansion valve based on the temperature of the inner disc. According to the air conditioner control method and device, reliability protection on the system under the scenes of the refrigeration mode, the heating mode and the dehumidification mode is achieved, the continuous heating or refrigeration requirement of a user is met, and the operation reliability of the air conditioner is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a method and device for controlling an expansion valve of an air conditioner, and the air conditioner. Background Art

[0002] Currently, variable-frequency air conditioners typically use expansion valves as system throttling elements. Compared to throttling elements like capillary tubes, expansion valves offer advantages such as precise flow control, a wide range of adaptability, and high energy efficiency. Compared to fixed-frequency air conditioners, variable-frequency air conditioners have wider operating frequencies, applicable voltages, and operating temperatures. To ensure user comfort, variable-frequency air conditioners operate significantly differently than fixed-frequency air conditioners, especially in low-load and high-load cooling and high-load heating scenarios. Therefore, variable-frequency air conditioner systems require more system protection features to ensure reliable operation. However, current control of variable-frequency air conditioner expansion valves generally lacks operational reliability protection for low-load and high-load cooling and high-load heating scenarios, reducing the reliability of the air conditioner's operation. Summary of the Invention

[0003] To solve the above problems, the present invention provides an expansion valve control method, device and air conditioner for an air conditioner, which realizes reliability protection of the system in cooling mode, heating mode and dehumidification mode scenarios, meets the user's continuous heating or cooling needs, and improves the reliability of the air conditioner operation.

[0004] According to an embodiment of the present invention, on one hand, a method for controlling an expansion valve of an air conditioner is provided, comprising:

[0005] After the air conditioner is turned on and runs for a first preset time, monitoring the current operating mode of the air conditioner;

[0006] If the operating mode is any one of the cooling mode, the heating mode and the dehumidification mode, the exhaust temperature of the compressor is monitored, and the opening of the expansion valve is protectively controlled according to the exhaust temperature;

[0007] An inner disk temperature is detected, and protection control of the expansion valve is performed based on the inner disk temperature.

[0008] By adopting the above technical solution, the operating mode of the air conditioner is monitored, and when the air conditioner is in cooling mode, heating mode or dehumidification mode, the expansion valve is protectively controlled according to the exhaust temperature of the compressor, and the expansion valve is protectively controlled based on the internal disk temperature. This achieves reliability protection of the system under high-load scenarios in cooling mode, heating mode and dehumidification mode, meets the user's continuous heating or cooling needs, and improves the reliability of the air conditioner operation.

[0009] Preferably, the protective control of the opening of the expansion valve according to the exhaust gas temperature includes:

[0010] If the exhaust gas temperature is greater than a first exhaust gas temperature upper limit, the expansion valve is controlled to open rapidly, so that the opening of the expansion valve increases by a first opening; wherein the opening of the expansion valve increases at a first rate;

[0011] If the exhaust temperature is greater than the second exhaust temperature upper limit value and less than or equal to the first exhaust temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

[0012] By adopting the above technical solution, the opening of the expansion valve can be quickly increased when the exhaust temperature is very high to ensure the reliability of the system operation; by controlling the opening of the expansion valve to prohibit it from being closed when the exhaust temperature is high, it can be prevented that the system regulation effect will be deteriorated due to control lag when the subsequent exhaust temperature changes greatly, thereby realizing the pre-regulation of the exhaust temperature.

[0013] Preferably, the protection control of the expansion valve based on the inner disk temperature includes:

[0014] If the inner disk temperature is lower than a first inner disk temperature lower limit, the expansion valve is slowly opened so that the opening of the expansion valve increases to a second opening; wherein the opening of the expansion valve increases at a second rate, and the second rate is lower than the first rate;

[0015] If the inner disk temperature is greater than the first inner disk temperature lower limit value and less than or equal to the second inner disk temperature lower limit value, the expansion valve opening is controlled to be prohibited from being closed.

[0016] By adopting the above technical solution, when the temperature of the inner disk is very low, the expansion valve is opened with slow-rise control, which can avoid local freezing of the indoor heat exchanger and improve the reliability of the air conditioner operation.

[0017] Preferably, the expansion valve control method further includes:

[0018] If the inner disk temperature is greater than a preset inner disk temperature upper limit, the expansion valve is controlled to open rapidly, so that the opening of the expansion valve increases by a third opening; wherein the opening of the expansion valve increases at a third rate, and the third rate is greater than the first rate.

[0019] By adopting the above technical solution, when the detected inner disk temperature is high, the expansion valve opening is controlled to be rapidly opened, which can prevent the inner disk temperature from being too high and ensure the reliability of the air conditioner operation.

[0020] Preferably, the expansion valve control method further includes:

[0021] If the operation mode is the cooling mode or the dehumidification mode, detecting the external disk temperature, and performing protection control on the expansion valve based on the external disk temperature;

[0022] If the operating mode is the heating mode, the process returns to the step of monitoring the current operating mode of the air conditioner.

[0023] By adopting the above technical solution, when the air conditioner operates in cooling mode or dehumidification mode, it enters the external disk protection control mode, and controls the expansion valve based on the external disk temperature to ensure the reliability of the air conditioner operation.

[0024] Preferably, the protection control of the expansion valve based on the external disk temperature includes:

[0025] If the outer disk temperature is greater than a first outer disk temperature upper limit, the expansion valve is rapidly opened to increase the opening of the expansion valve by a fourth opening; wherein the opening of the expansion valve increases at a fourth rate.

[0026] By adopting the above technical solution, when the outer disk temperature of the air conditioner is high in cooling mode or dehumidification mode, the expansion valve opening is controlled to increase rapidly, which can prevent the outer disk temperature from being too high and realize system reliability protection in the high-load dehumidification scenario of the refrigerator.

[0027] Preferably, the protection control of the expansion valve based on the external disk temperature includes:

[0028] If the outer disk temperature is greater than the second outer disk temperature upper limit value and less than the first outer disk temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

[0029] By adopting the above technical solution, when the external disk temperature is high, the opening of the expansion valve is controlled to be prohibited from being closed, which can prevent the external disk temperature from increasing too quickly and affecting the reliability of system operation, thereby improving the stability of air conditioner operation.

[0030] Preferably, the expansion valve control method further includes:

[0031] If the cumulative increase in the opening of the expansion valve within the third preset time period reaches a preset cumulative opening threshold, the control of the opening of the expansion valve is suspended.

[0032] By adopting the above technical solution, when the cumulative increase in the opening of the expansion valve is large within a certain period of time, the control of the expansion valve is suspended to prevent the opening of the expansion valve from increasing too much in a short period of time.

[0033] According to another aspect of an embodiment of the present invention, an expansion valve control device for an air conditioner is provided, comprising:

[0034] a monitoring module, configured to monitor the current operating mode of the air conditioner after the air conditioner has been turned on and operated for a first preset time period;

[0035] a first control module, configured to monitor the exhaust temperature of the compressor when the operating mode is any one of the cooling mode, the heating mode, and the dehumidification mode, and to perform protective control on the opening of the expansion valve according to the exhaust temperature;

[0036] The second control module is used to detect the inner disk temperature and perform protection control on the expansion valve based on the inner disk temperature.

[0037] According to an embodiment of the present invention, another aspect provides an air conditioner, comprising a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the method according to any one of the first aspects.

[0038] The present invention has the following beneficial effects: by monitoring the operating mode of the air conditioner, and protectively controlling the expansion valve according to the exhaust temperature of the compressor when the air conditioner is in cooling mode, heating mode or dehumidification mode, and protectively controlling the expansion valve based on the internal disk temperature, reliability protection of the system is achieved under high-load scenarios in cooling mode, heating mode and dehumidification mode, meeting the user's continuous heating or cooling needs, and improving the reliability of the air conditioner operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0040] The structures, proportions, sizes, etc. illustrated in this specification are intended only to complement the contents disclosed herein and to facilitate understanding and reading by persons familiar with the art. They are not intended to limit the conditions under which the present invention may be implemented and therefore have no substantive technical significance. Any structural modifications, changes in proportions, or adjustments in sizes, without affecting the efficacy and objectives of the present invention, shall still fall within the scope of the technical contents disclosed herein.

[0041] Figure 1 A flow chart of an expansion valve control method for an air conditioner provided by the present invention;

[0042] Figure 2 A flow chart of a variable frequency air conditioner expansion valve control method provided by the present invention;

[0043] Figure 3 This is a structural schematic diagram of an expansion valve control device for an air conditioner provided by the present invention. DETAILED DESCRIPTION

[0044] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0046] This embodiment provides an expansion valve control method for an air conditioner. The method can be applied to an air conditioner. Figure 1 The expansion valve control method of the air conditioner shown in the flowchart mainly includes the following steps S102 to S106:

[0047] Step S102: After the air conditioner is turned on and runs for a first preset time, the current operating mode of the air conditioner is monitored;

[0048] The first preset time period may be in the range of 5 to 10 minutes, preferably 7 minutes. The air conditioner enters a stable operating state after being powered on and running for a period of time. By starting to detect the operating mode, exhaust temperature, and internal disk temperature after the air conditioner has been powered on and running for a period of time, the current operating state of the air conditioner can be detected more accurately, thereby improving the rationality of expansion valve control.

[0049] In one embodiment, the current operating mode may be determined once every period of time (such as every 50 to 70 seconds, preferably 60 seconds) to perform periodic control until the air conditioner is turned off or stopped.

[0050] Step S104: If the operating mode is any one of the cooling mode, the heating mode, and the dehumidification mode, the exhaust temperature of the compressor is monitored, and the opening of the expansion valve is protected and controlled according to the exhaust temperature;

[0051] When the air conditioner is in any of the cooling, heating and dehumidification modes, protective control of the expansion valve begins; the exhaust temperature of the compressor is monitored. Since the compressor is the core component for the reliable operation of the air conditioner, it is necessary to first ensure the reliability of the compressor operation, detect and determine the temperature range of the current exhaust temperature of the compressor, and control the switching speed of the expansion valve according to the temperature range of the current exhaust temperature of the compressor to ensure the reliability of the compressor operation.

[0052] If the operating mode of the air conditioner is ventilation mode or other auxiliary operating mode, the air conditioner operates according to normal control logic without increasing the control of the expansion valve.

[0053] Step S106: Detect the inner disk temperature and perform protection control on the expansion valve based on the inner disk temperature.

[0054] After the expansion valve is controlled based on the exhaust temperature of the compressor, the internal disk protection control is entered, and the expansion valve is controlled according to the temperature range of the detected internal disk temperature.

[0055] The expansion valve control method of the above-mentioned air conditioner provided in this embodiment monitors the operating mode of the air conditioner and protectively controls the expansion valve according to the exhaust temperature of the compressor when the air conditioner is in cooling mode, heating mode or dehumidification mode, and protectively controls the expansion valve based on the internal disk temperature, thereby achieving reliability protection of the system in cooling mode, heating mode and dehumidification mode scenarios, meeting the user's continuous heating or cooling needs, and improving the reliability of the air conditioner operation.

[0056] In one embodiment, this embodiment provides a specific implementation method for protecting and controlling the opening of the expansion valve according to the exhaust gas temperature:

[0057] If the exhaust gas temperature is greater than the first exhaust gas temperature upper limit, the expansion valve is rapidly opened to increase the opening of the expansion valve by a first opening; wherein the opening of the expansion valve increases at a first rate;

[0058] If the exhaust temperature is greater than the second exhaust temperature upper limit value and less than or equal to the first exhaust temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

[0059] The value range of the above-mentioned first exhaust temperature upper limit value can be 95℃~105℃, preferably 100℃; the above-mentioned second exhaust temperature upper limit value is smaller than the first exhaust temperature upper limit value, and the value range of the second exhaust temperature upper limit value can be 90℃~100℃, preferably 95℃.

[0060] The above-mentioned first opening is related to the matching number of the air conditioner and the heating or cooling demand. The value range of the first opening can be 10~20P, preferably 15P. The value range of the above-mentioned first rate can be 0.2P / s~0.3P / s, preferably 0.25P / s. For example, the opening of the expansion valve can be controlled to increase by 15P within 60s.

[0061] In one embodiment, if the cumulative increase in the expansion valve opening reaches a preset cumulative opening threshold within a third preset time period, control of the expansion valve opening is suspended. In the periodic control of the air conditioner expansion valve, if the number of times the expansion valve is rapidly opened based on the exhaust gas temperature reaches a preset number (such as 3 to 5 times, preferably 4 times), that is, the cumulative increase in the expansion valve opening based on the exhaust gas temperature within the third preset time period reaches 50 to 70P, preferably 60P, control of the expansion valve opening is suspended and control of the expansion valve is resumed after the third preset time period.

[0062] When it is detected that the exhaust temperature is greater than the first exhaust temperature upper limit, it indicates that the current exhaust temperature is very high. If the exhaust temperature remains in a high temperature state for a long time, it is easy to affect the reliability and life of the compressor. Therefore, when the exhaust temperature is very high, the opening of the expansion valve is quickly increased to ensure the reliability of the system operation; when it is detected that the exhaust temperature is greater than the second exhaust temperature upper limit and less than or equal to the first exhaust temperature upper limit, it indicates that the current exhaust temperature is high. If the opening of the expansion valve continues to be closed, the exhaust temperature will rise rapidly and affect the reliability of the system operation. Therefore, when the exhaust temperature is high, the opening of the expansion valve is prohibited from being closed, which can prevent the system regulation effect from deteriorating due to control lag when the subsequent exhaust temperature changes significantly, thereby realizing the pre-regulation of the exhaust temperature.

[0063] In one embodiment, this embodiment provides a specific implementation of protection control of the expansion valve based on the inner disk temperature:

[0064] If the inner disk temperature is lower than the first inner disk temperature lower limit, the expansion valve is slowly opened so that the opening of the expansion valve increases to a second opening; wherein the opening of the expansion valve increases at a second rate, which is lower than the first rate;

[0065] If the inner disk temperature is greater than the first inner disk temperature lower limit value and less than or equal to the second inner disk temperature lower limit value, the expansion valve opening is controlled to be prohibited from being closed.

[0066] The lower limit value of the first inner plate temperature may range from 2°C to 7°C, preferably 5°C; the lower limit value of the second inner plate temperature may be greater than the lower limit value of the first inner plate temperature, and the lower limit value of the second inner plate temperature may range from 7°C to 10°C, preferably 8°C.

[0067] The above-mentioned second opening is related to the matching number of the air conditioner and the heating or cooling demand. The value range of the second opening can be 3~5P, preferably 4P. The value range of the above-mentioned second rate can be 0.1P / s~0.3P / s, preferably 0.2P / s. For example, the opening of the expansion valve can be controlled to increase by 4P within 20s.

[0068] In one embodiment, if the cumulative increase in the expansion valve opening reaches a preset cumulative opening threshold within a third preset time period, control of the expansion valve opening is suspended. In the periodic control of the air conditioner expansion valve, if the number of slow opening controls of the expansion valve based on the internal disk temperature reaches a preset number (e.g., 4 to 6 times, preferably 5 times), i.e., the cumulative increase in the expansion valve opening based on the internal disk temperature within the third preset time period reaches 10 to 30P, preferably 20P, control of the expansion valve opening is suspended and control of the expansion valve is resumed after the third preset time period.

[0069] When the internal disk temperature is less than the first internal disk temperature lower limit, it indicates that the overall temperature of the indoor unit heat exchanger is very low. If the expansion valve opening remains unchanged or is closed slightly, the indoor heat exchanger temperature may continue to drop, causing localized icing, which is detrimental to system reliability. However, icing takes time to accumulate, so there is no need to control the expansion valve to open quickly. By using slow-rise control to increase the expansion valve opening when the internal disk temperature is very low, localized icing in the indoor heat exchanger can be avoided, improving the reliability of the air conditioner. When the internal disk temperature is greater than the first internal disk temperature lower limit but less than or equal to the second internal disk temperature lower limit, the internal disk temperature is low but will not cause icing of the indoor heat exchanger. There is no need to control the expansion valve, which avoids affecting the stability of system operation.

[0070] In one embodiment, the method provided in this embodiment further includes:

[0071] If the inner disk temperature is greater than the preset inner disk temperature upper limit, the expansion valve is controlled to open rapidly, so that the opening of the expansion valve increases to a third opening; wherein the opening of the expansion valve increases at a third rate, and the third rate is greater than the first rate.

[0072] The above-mentioned preset upper limit value of the internal disk temperature is lower than the conventional alarm temperature when the internal disk temperature is too high. The value range of the above-mentioned preset upper limit value of the internal disk temperature can be 45°C to 55°C, preferably 50°C; the above-mentioned third opening is related to the matching number of the air conditioner and the heating or cooling demand. The value range of the third opening can be 8 to 12P, preferably 10P. The value range of the above-mentioned third rate can be 0.2P / s to 0.4P / s, preferably 0.3P / s. For example, the opening of the expansion valve can be controlled to increase by 10P within 30s.

[0073] In one embodiment, if the cumulative increase in the expansion valve opening reaches a preset cumulative opening threshold within a third preset time period, control of the expansion valve opening is suspended. In the periodic control of the air conditioner expansion valve, if the number of sudden openings of the expansion valve based on the internal disk temperature reaches a preset number (e.g., 4 to 6 times, preferably 5 times), i.e., the cumulative increase in the expansion valve opening at a third rate based on the internal disk temperature reaches 40 to 60 P, preferably 50 P, within the third preset time period, control of the expansion valve opening is suspended and control of the expansion valve is resumed after the third preset time period.

[0074] When the internal disk temperature is greater than the preset internal disk temperature upper limit, it indicates that the system pressure and pressure difference are at a high level, which is likely to affect the reliability of the compressor operation. By controlling the expansion valve opening to open rapidly when the detected internal disk temperature is high, the internal disk temperature can be prevented from being too high, thereby ensuring the reliability of the air conditioner operation.

[0075] In one embodiment, the method provided in this embodiment further includes:

[0076] If the operating mode is cooling mode or dehumidification mode, the external disk temperature is detected and the expansion valve is protected and controlled based on the external disk temperature;

[0077] If the operating mode is the heating mode, return to the step of monitoring the current operating mode of the air conditioner.

[0078] After controlling the expansion valve opening based on the exhaust temperature and the internal disk temperature, continue to judge the operating mode of the air conditioner. If it is in heating mode, the air conditioner operates according to the normal operating logic and returns to the step of monitoring the current operating mode of the air conditioner. The operating mode of the air conditioner is judged at regular intervals; if it is in cooling mode or dehumidification mode, enter the external disk protection control and control the expansion valve based on the range of the external disk temperature to ensure the reliability of the air conditioner operation.

[0079] In one embodiment, this embodiment provides a specific implementation of protection control of the expansion valve based on the external disk temperature:

[0080] If the outer disk temperature is greater than the first outer disk temperature upper limit, the expansion valve is rapidly opened to increase the opening of the expansion valve to a fourth opening; wherein the opening of the expansion valve increases at a fourth rate.

[0081] The value range of the above-mentioned first external disk temperature upper limit value can be 48℃~58℃, preferably 52℃; the above-mentioned fourth opening degree is related to the matching number of the air conditioner and the heating or cooling demand, and the value range of the fourth opening degree can be 8~12P, preferably 10P. The value range of the above-mentioned third rate can be 0.2P / s~0.4P / s, preferably 0.3P / s. For example, the opening degree of the expansion valve can be controlled to increase by 10P within 30s.

[0082] In one embodiment, if the cumulative increase in the expansion valve opening reaches a preset cumulative opening threshold within a third preset time period, control of the expansion valve opening is suspended. In the periodic control of the air conditioner expansion valve, if the number of times the expansion valve is rapidly opened based on the external disk temperature reaches a preset number (e.g., 4 to 6 times, preferably 5 times), i.e., the cumulative increase in the expansion valve opening at a fourth rate based on the external disk temperature within the third preset time period reaches 40 to 60 P, preferably 50 P, control of the expansion valve opening is suspended and control of the expansion valve is resumed after the third preset time period.

[0083] When the external disk temperature is greater than the first external disk temperature upper limit, it indicates that the system pressure and pressure difference are at a high level, which is likely to affect the reliability of the compressor operation. By controlling the expansion valve opening to increase rapidly when the external disk temperature of the air conditioner is high in cooling mode or dehumidification mode, the external disk temperature can be prevented from being too high, thereby achieving system reliability protection in the high-load dehumidification scenario of the refrigerator.

[0084] If the external disk temperature is greater than the second external disk temperature upper limit value and less than the first external disk temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

[0085] The second outer disk temperature upper limit is lower than the first outer disk temperature upper limit, and the second outer disk temperature upper limit may be in the range of 45°C to 55°C, preferably 49°C. When the outer disk temperature is higher than the second outer disk temperature upper limit but lower than the first outer disk temperature upper limit, if the expansion valve opening is further reduced, the outer disk temperature may increase too quickly, thereby affecting the reliability of the system operation. By controlling the expansion valve opening to prohibit reduction when the outer disk temperature is high, the outer disk temperature may be prevented from increasing too quickly, thereby affecting the reliability of the system operation, thereby improving the stability of the air conditioner operation.

[0086] The expansion valve control method of the air conditioner provided in this embodiment realizes system reliability protection in low-load cooling, high-load heating and high-load heating scenarios by setting a reasonable opening increase rate for the expansion valve according to the operating mode, exhaust temperature, inner disk temperature and outer disk temperature of the air conditioner, meets the user's continuous cooling and heating needs, improves product reliability and added value, and improves system reliability and user comfort experience.

[0087] Corresponding to the expansion valve control method of the air conditioner provided in the above embodiment, the embodiment of the present invention provides an example of applying the above expansion valve control method of the air conditioner to control the expansion valve of the variable frequency air conditioner, see Figure 2 The flow chart of the variable frequency air conditioner expansion valve control method is shown in the figure. The specific steps can be referred to as follows:

[0088] Step 1: Turn on the air conditioner and run it normally for 7 minutes. Then determine whether the operating mode is cooling, heating or dehumidification. If so, enter the special protection control function of the expansion valve.

[0089] If it is other auxiliary operation modes such as ventilation, it will operate according to the normal operation logic of the air conditioner. When the air conditioner is turned on, it will continue to judge periodically until the mode conditions are met, and then enter the special protection control function of the expansion valve.

[0090] Step 2: After entering the expansion valve special protection control function:

[0091] ①Monitor the exhaust temperature of the compressor: If the exhaust temperature T 排气 >100℃, the expansion valve opening is controlled by emergency opening 15P (60s) (i.e. the opening increases by 15P within 60s), and the adjustment is suspended after the module increases by 60P (i.e. 60 steps) within a certain period of time (such as 20 minutes); if 95℃ <

[0092] T 排气 ≤100℃, the expansion valve opening is prohibited from being closed;

[0093] ② Enter the inner disk protection control module, if the inner disk temperature T 内盘 <5℃, the expansion valve opening is controlled by slow increase of 4P(20s) (i.e. the opening increases by 4P within 20s), and normal control is performed after the increase of 20P; if 5℃ < T 内盘 ≤8℃, the expansion valve opening is prohibited from being closed; if the inner disk temperature T 内盘 >

[0094] If the temperature is 50℃, the expansion valve opening is controlled by emergency opening 10P (30s) (i.e. the opening increases by 10P within 30s), and the adjustment is suspended after the module increases by 50P (i.e. 50 steps) within a certain period of time (such as 20 minutes);

[0095] ③ Further judge the operation mode. If it is heating mode, it will run according to the normal operation logic of the air conditioner and perform periodic judgment at regular intervals (such as once every 1 minute); if it is cooling or dehumidification mode, it will enter the external disk protection control module. If the external disk temperature T 外盘 >52℃, the expansion valve opening is controlled by emergency opening 10P (30s) (i.e. the opening increases by 10P within 30s), and the adjustment is suspended after the module increases by 50P (i.e. 50 steps) within a certain period of time (such as 20 minutes);

[0096] If 49℃<T 外盘 ≤52℃, the expansion valve opening is prohibited from being closed;

[0097] Step 3: When the air conditioner is turned on, a judgment is performed every 1 minute until the user turns off the air conditioner and the air conditioner stops.

[0098] Corresponding to the expansion valve control method of the air conditioner provided in the above embodiment, the embodiment of the present invention provides an expansion valve control device for an air conditioner, which can be applied to the air conditioner, see Figure 3 The expansion valve control device of the air conditioner shown in the figure is a schematic diagram of the structure of the expansion valve control device of the air conditioner, which includes the following modules:

[0099] The monitoring module 31 is used to monitor the current operating mode of the air conditioner after the air conditioner is turned on and operated for a first preset time period;

[0100] The first control module 32 is used to monitor the exhaust temperature of the compressor when the operating mode is any one of the cooling mode, the heating mode and the dehumidification mode, and to perform protective control on the opening of the expansion valve according to the exhaust temperature;

[0101] The second control module 33 is used to detect the inner disk temperature and perform protection control on the expansion valve based on the inner disk temperature.

[0102] The expansion valve control device of the above-mentioned air conditioner provided in this embodiment monitors the operating mode of the air conditioner and performs protective control on the expansion valve according to the exhaust temperature of the compressor when the air conditioner is in cooling mode, heating mode or dehumidification mode, and performs protective control on the expansion valve based on the internal disk temperature, thereby realizing reliability protection of the system in cooling mode, heating mode and dehumidification mode scenarios, meeting the user's continuous heating or cooling needs, and improving the reliability of the air conditioner operation.

[0103] In one embodiment, the first control module 32 is configured to perform a rapid opening control on the expansion valve if the exhaust temperature is greater than a first exhaust temperature upper limit value, so that the opening of the expansion valve increases to a first opening degree; wherein the opening of the expansion valve increases at a first rate; and if the exhaust temperature is greater than a second exhaust temperature upper limit value and less than or equal to the first exhaust temperature upper limit value, the opening of the expansion valve is controlled to be prohibited from being closed.

[0104] In one embodiment, the first control module 32 is configured to perform a slow-opening control on the expansion valve if the inner disk temperature is less than a first inner disk temperature lower limit value, so that the opening of the expansion valve increases to a second opening degree; wherein the opening of the expansion valve increases at a second rate, which is less than the first rate; and if the inner disk temperature is greater than the first inner disk temperature lower limit value and less than or equal to the second inner disk temperature lower limit value, the expansion valve opening is controlled to be prohibited from being closed.

[0105] In one embodiment, the above device further comprises:

[0106] The third control module is used to control the expansion valve to open rapidly if the inner disk temperature is greater than a preset inner disk temperature upper limit value, so that the opening of the expansion valve increases to a third opening degree; wherein the opening of the expansion valve increases at a third rate, and the third rate is greater than the first rate.

[0107] The fourth control module is used to detect the external disk temperature if the operating mode is cooling mode or dehumidification mode, and perform protection control on the expansion valve based on the external disk temperature; if the operating mode is heating mode, return to the execution monitoring module.

[0108] The fourth control module is configured to perform rapid opening control on the expansion valve to increase the opening of the expansion valve to a fourth opening if the outer disk temperature is greater than the first outer disk temperature upper limit; wherein the opening of the expansion valve increases at a fourth rate.

[0109] The fourth control module is configured to control the opening of the expansion valve to prohibit closing if the external disk temperature is greater than the second external disk temperature upper limit value and less than the first external disk temperature upper limit value.

[0110] The fifth control module is configured to suspend control of the opening of the expansion valve if the cumulative increase in the opening of the expansion valve within a third preset time period reaches a preset cumulative opening threshold.

[0111] Corresponding to the expansion valve control method of the air conditioner provided in the above embodiment, this embodiment provides an air conditioner, which includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the expansion valve control method of the air conditioner provided in the above embodiment is implemented.

[0112] This embodiment further provides a computer-readable storage medium having a computer program stored thereon. When executed by a processor, the computer program implements the various processes of the aforementioned embodiment of the air conditioner expansion valve control method and achieves the same technical effects. To avoid repetition, the details are not described here. The computer-readable storage medium may be, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0113] Of course, those skilled in the art will understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the control device through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

[0114] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

[0115] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0116] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from the other embodiments. Reference will be made to the common and similar parts between the various embodiments. Regarding the expansion valve control device and air conditioner disclosed in the embodiments, since they correspond to the expansion valve control method for the air conditioner disclosed in the embodiments, the description is relatively simple. For relevant details, refer to the method description.

[0117] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0118] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A method for controlling an expansion valve of an air conditioner, characterized in that: include: After the air conditioner is turned on and runs for a first preset time, monitoring the current operating mode of the air conditioner; If the operating mode is any one of the cooling mode, the heating mode and the dehumidification mode, the exhaust temperature of the compressor is monitored, and the opening of the expansion valve is protectively controlled according to the exhaust temperature; An inner disk temperature is detected, and protection control of the expansion valve is performed based on the inner disk temperature.

2. The expansion valve control method according to claim 1, wherein: The protective control of the opening of the expansion valve according to the exhaust gas temperature includes: If the exhaust gas temperature is greater than a first exhaust gas temperature upper limit, the expansion valve is controlled to open rapidly, so that the opening of the expansion valve increases by a first opening; wherein the opening of the expansion valve increases at a first rate; If the exhaust temperature is greater than the second exhaust temperature upper limit value and less than or equal to the first exhaust temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

3. The expansion valve control method according to claim 2, wherein: The protecting and controlling the expansion valve based on the inner disk temperature includes: If the inner disk temperature is lower than a first inner disk temperature lower limit, the expansion valve is slowly opened so that the opening of the expansion valve increases to a second opening; wherein the opening of the expansion valve increases at a second rate, and the second rate is lower than the first rate; If the inner disk temperature is greater than the first inner disk temperature lower limit value and less than or equal to the second inner disk temperature lower limit value, the expansion valve opening is controlled to be prohibited from being closed.

4. The expansion valve control method according to claim 3, wherein: Also includes: If the inner disk temperature is greater than a preset inner disk temperature upper limit, the expansion valve is controlled to open rapidly, so that the opening of the expansion valve increases by a third opening; wherein the opening of the expansion valve increases at a third rate, and the third rate is greater than the first rate.

5. The expansion valve control method according to claim 1, wherein: Also includes: If the operation mode is the cooling mode or the dehumidification mode, detecting the external disk temperature, and performing protection control on the expansion valve based on the external disk temperature; If the operating mode is the heating mode, the process returns to the step of monitoring the current operating mode of the air conditioner.

6. The expansion valve control method according to claim 5, characterized in that: The protecting and controlling the expansion valve based on the external disk temperature includes: If the outer disk temperature is greater than a first outer disk temperature upper limit, the expansion valve is rapidly opened to increase the opening of the expansion valve by a fourth opening; wherein the opening of the expansion valve increases at a fourth rate.

7. The expansion valve control method according to claim 5, wherein: The protecting and controlling the expansion valve based on the external disk temperature includes: If the outer disk temperature is greater than the second outer disk temperature upper limit value and less than the first outer disk temperature upper limit value, the opening of the expansion valve is controlled so as not to be reduced.

8. The expansion valve control method according to any one of claims 2 to 6, characterized in that: Also includes: If the cumulative increase in the opening of the expansion valve within the third preset time period reaches a preset cumulative opening threshold, the control of the opening of the expansion valve is suspended.

9. An expansion valve control device for an air conditioner, characterized in that: include: a monitoring module, configured to monitor the current operating mode of the air conditioner after the air conditioner has been turned on and operated for a first preset time period; a first control module, configured to monitor the exhaust temperature of the compressor when the operating mode is any one of the cooling mode, the heating mode, and the dehumidification mode, and to perform protective control on the opening of the expansion valve according to the exhaust temperature; The second control module is used to detect the inner disk temperature and perform protection control on the expansion valve based on the inner disk temperature.

10. An air conditioner, characterized in that: The method comprises a computer-readable storage medium storing a computer program and a processor, wherein the computer program, when read and executed by the processor, implements the method according to any one of claims 1 to 8.

Images