Adjusting method and device for electronic expansion valve of air conditioner, air conditioner and medium

Abstract

The invention discloses an adjusting method and device for an electronic expansion valve of an air conditioner, the air conditioner and a medium, the air conditioner further comprises a compressor, and the method comprises the steps that when the target exhaust temperature of the compressor is in a stable state, the actual exhaust temperature of the compressor is obtained; the opening degree of the electronic expansion valve is adjusted according to the actual exhaust temperature every first duration, so that the actual exhaust temperature is close to the target exhaust temperature; and the first duration is updated according to the change trend of the actual exhaust temperature in second duration, and the second duration comprises multiple continuous first durations. Therefore, the influence of exhaust temperature fluctuation can be reduced, and the opening degree adjusting efficiency of the electronic expansion valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioner control, and particularly to a method and device for adjusting an electronic expansion valve of an air conditioner, an air conditioner, and a medium. Background Art

[0002] The electronic expansion valve is a common component in an air conditioning system. During the operation of the air conditioning system, in order to operate under the target required working conditions, the opening of the electronic expansion valve can be adjusted according to the current exhaust temperature of the compressor in the air conditioning system to stabilize the exhaust temperature at the target temperature. However, in this case, the exhaust temperature will show hysteresis due to the influence of the operation of the air conditioning system, resulting in large fluctuations in the exhaust temperature of the compressor during the adjustment of the electronic expansion valve, which affects the opening adjustment of the electronic expansion valve, makes it difficult to maintain the exhaust temperature of the compressor at the target temperature, and reduces the adjustment efficiency of the electronic expansion valve. Summary of the Invention

[0003] The purpose of the present invention is to at least solve one of the technical problems existing in the prior art, and provide a method and device for adjusting an electronic expansion valve of an air conditioner, an air conditioner, and a medium, which can reduce the influence of exhaust temperature fluctuations and improve the adjustment efficiency of the electronic expansion valve opening.

[0004] In a first aspect, an embodiment of the present invention provides a method for adjusting an electronic expansion valve of an air conditioner, where the air conditioner includes a compressor, and the method includes:

[0005] When the target exhaust temperature of the compressor is in a stable state, obtain the actual exhaust temperature of the compressor;

[0006] Every first time period, adjust the opening of the electronic expansion valve according to the actual exhaust temperature so that the actual exhaust temperature approaches the target exhaust temperature;

[0007] Update the first time period according to the change trend of the actual exhaust temperature within a second time period, where the second time period includes a plurality of consecutive first time periods.

[0008] The adjustment method of the electronic expansion valve provided by the embodiment of the present invention has at least the following beneficial effects: The target exhaust temperature of the compressor can characterize the current target operating condition of the air conditioner. Therefore, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period in the subsequent adjustment process of the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening of the electronic expansion valve to tend to be stable while accelerating the actual exhaust temperature to stabilize at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating condition and improve the reliability of the air conditioner operation.

[0009] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the updating of the first time period according to the change trend of the actual exhaust temperature within the second time period includes:

[0010] When there are maximum values or minimum values in the actual exhaust temperature within multiple consecutive first time periods, and all the maximum values and all the minimum values appear alternately, compare the differences between any two extreme values among all the maximum values and all the minimum values to obtain a difference comparison result;

[0011] Adjust the first time period according to the difference comparison result.

[0012] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the adjusting of the first time period according to the difference comparison result includes:

[0013] When the difference comparison result is that the difference between any two maximum values is less than a first preset value and the difference between any two minimum values is less than the first preset value, increase the first time period.

[0014] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the adjusting of the first time period according to the difference comparison result includes:

[0015] When the difference comparison result is that the difference between any one maximum value and any one minimum value is less than a second preset value, increase the first time period.

[0016] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the adjusting of the first time period according to the difference comparison result includes:

[0017] When the difference comparison result shows that the difference between any two of the maximum values is less than a first preset value, the difference between any two of the minimum values is less than the first preset value, and the difference between any one of the maximum values and any one of the minimum values is less than a second preset value, increase the first duration;

[0018] Wherein, the second preset value is greater than the first preset value.

[0019] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the increasing of the first duration includes:

[0020] According to the extreme value occurrence moment of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first duration, obtain a first delay duration;

[0021] Based on the first delay duration, perform an increasing adjustment on the first duration.

[0022] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the obtaining of the first delay duration according to the occurrence moment of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first duration includes:

[0023] According to the duration between the occurrence moment of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first duration and the start moment of the corresponding first duration, obtain a first delay duration.

[0024] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the obtaining of the first delay duration according to the extreme value occurrence moment of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first duration includes:

[0025] Based on multiple consecutive first durations, according to the extreme value occurrence moments of all the maximum values and all the minimum values in the corresponding first durations, obtain multiple second delay durations;

[0026] Perform an average calculation or a weighted summation calculation on all the second delay durations to obtain a first delay duration.

[0027] In the adjustment method of the electronic expansion valve provided by the embodiment of the present invention, the updating of the first duration according to the change trend of the actual exhaust temperature within the second duration includes:

[0028] When the difference between the actual exhaust temperature and the target exhaust temperature is less than a third preset value, update the first duration according to the change trend of the actual exhaust temperature within the second duration.

[0029] In a second aspect, an embodiment of the present invention provides an operation control device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the program to implement the adjustment method of the electronic expansion valve as described in the first aspect embodiment above.

[0030] According to the operation control device provided by the embodiment of the present invention, it has at least the following beneficial effects: The target exhaust temperature of the compressor can represent the current target operating condition of the air conditioner. Therefore, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period in the subsequent adjustment process of the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening of the electronic expansion valve to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating condition and improve the reliability of the air conditioner operation.

[0031] In a third aspect, an embodiment of the present invention provides an air conditioner, including an electronic expansion valve, a compressor, and the operation control device as described in the second aspect embodiment above.

[0032] According to the air conditioner provided by the embodiment of the present invention, it has at least the following beneficial effects: The target exhaust temperature of the compressor can represent the current target operating condition of the air conditioner. Therefore, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period in the subsequent adjustment process of the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening of the electronic expansion valve to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating condition and improve the reliability of the air conditioner operation.

[0033] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to execute the adjustment method of the electronic expansion valve as described in the first aspect embodiment above.

[0034] According to the computer-readable storage medium provided by the embodiments of the present invention, it has at least the following beneficial effects: The target exhaust temperature of the compressor can characterize the current target operating condition of the air conditioner. Therefore, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening degree of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period in the subsequent adjustment process of the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening degree of the electronic expansion valve to tend to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating condition and improve the reliability of the air conditioner operation.

[0035] Other features and advantages of the present invention will be described in the following description, and, in part, will be obvious from the description, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures specifically pointed out in the description, the claims, and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings are used to provide a further understanding of the technical solutions of the present invention, and constitute a part of the description. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation to the technical solutions of the present invention.

[0037] The present invention will be further described below in conjunction with the drawings and embodiments;

[0038] Figure 1 is a flowchart of a method for adjusting an electronic expansion valve of an air conditioner provided by an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of the change of the actual exhaust temperature provided by an embodiment of the present invention;

[0040] Figure 3 is a schematic diagram of the change of the actual exhaust temperature after adjusting the first time period provided by an embodiment of the present invention;

[0041] Figure 4 is provided by an embodiment of the present invention Figure 4 shows a specific process schematic diagram in step S310;

[0042] Figure 5 is provided by an embodiment of the present invention Figure 5A specific process schematic diagram in step S320 shown;

[0043] Figure 6 It is a schematic diagram of the change in the actual exhaust temperature that meets the condition of increasing the first duration provided by an embodiment of the present invention;

[0044] Figure 7 It is a specific process schematic diagram during the process of increasing the first duration provided by an embodiment of the present invention;

[0045] Figure 8 It is provided by an embodiment of the present invention Figure 7 A specific process schematic diagram in step S340 shown;

[0046] Figure 9 It is provided by an embodiment of the present invention Figure 7 A specific process schematic diagram in step S340 shown;

[0047] Figure 10 It is provided by an embodiment of the present invention Figure 1 A specific process schematic diagram in step S300 shown;

[0048] Figure 11 It is provided by an embodiment of the present invention Figure 1 A specific process schematic diagram in step S200 shown;

[0049] Figure 12 It is a schematic diagram of the structure of an operation control device provided by an embodiment of the present invention. Detailed implementation manners

[0050] This part will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the protection scope of the present invention.

[0051] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, understand greater than, less than, exceeding, etc. as not including the number itself, understand above, below, within, etc. as including the number itself, "at least one" means one or more, "at least one of the following" and its similar expressions mean any combination of these items, including any combination of single items or plural items. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0052] It should be noted that in the embodiments of the present invention, terms such as "set", "installed", and "connected" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connected" can be a mechanical connection, an electrical connection, or a connection that allows mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0053] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", and "connected" should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0055] The electronic expansion valve is a common component in air-conditioning systems such as air conditioners and heat pump water heaters. During the operation of the air-conditioning system, in order to operate under the target required working conditions, it is necessary to adjust the refrigerant flow rate in the air-conditioning system accordingly. Therefore, an electronic expansion valve can be used to adjust the refrigerant flow rate, thereby changing the exhaust temperature of the compressor in the air-conditioning system, so that the exhaust temperature of the compressor can be stabilized at the target temperature, that is, it means that the air-conditioning system operates under the target required working conditions. Thus, the opening degree of the electronic expansion valve can be adjusted according to the current exhaust temperature of the compressor in the air-conditioning system to keep the exhaust temperature stable at the target temperature. However, in this case, the exhaust temperature will show hysteresis due to the influence of the operation of the air-conditioning system, resulting in easy fluctuations and large fluctuations in the exhaust temperature of the compressor during the adjustment of the electronic expansion valve, affecting the opening degree adjustment of the electronic expansion valve, and thus making it difficult to maintain the exhaust temperature of the compressor at the target temperature, affecting the reliability of the operation of the air-conditioning system.

[0056] Based on this, the present invention provides a method for adjusting an electronic expansion valve, an operation control device, an air conditioner, and a medium. By monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and taking the first duration as a cycle, the opening degree of the electronic expansion valve is periodically adjusted using the actual exhaust temperature, so that the actual exhaust temperature of the compressor is expected to be close to the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, in order to avoid over-adjusting the opening degree of the electronic expansion valve and causing the actual exhaust temperature to deviate from the target exhaust temperature, the control period of the electronic expansion valve, that is, the first duration, is adjusted and updated according to the change trend of the actual exhaust temperature in the second period, that is, the change trend of the actual exhaust temperature in multiple consecutive first durations. Thus, it is possible to provide a sufficient and appropriate time interval after adjusting the opening degree of the electronic expansion valve for the actual exhaust temperature to tend to be stable, and it is also possible to avoid the control period of the electronic expansion valve being too long and affecting the adjustment efficiency, which helps to reduce the frequent change phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, accelerate the opening degree of the electronic expansion valve to tend to be stable, and at the same time accelerate the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioning system can quickly reach the required target operating condition and improve the reliability of air conditioning operation. The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0057] Referring to Figure 1 , Figure 1 is a flowchart of a method for adjusting an electronic expansion valve of an air conditioner provided by an embodiment of the present invention. The adjustment method includes but is not limited to the following steps:

[0058] Step S100: When the target exhaust temperature of the compressor is in a stable state, obtain the actual exhaust temperature of the compressor.

[0059] Step S200: Every first duration, adjust the opening degree of the electronic expansion valve according to the actual exhaust temperature, so that the actual exhaust temperature approaches the target exhaust temperature.

[0060] Step S300: Update the first duration according to the change trend of the actual exhaust temperature in the second duration.

[0061] It can be understood that the actual exhaust temperature is the real-time temperature value detected by the temperature sensor currently installed at the refrigerant outlet of the compressor. Among them, when the target exhaust temperature is in a stable state, the actual exhaust temperature can be monitored in real time, and the actual exhaust temperature of the compressor can be continuously obtained to calculate the change trend of the actual exhaust temperature obtained in the second duration.

[0062] It can be understood that the target exhaust temperature can be a preset fixed temperature value obtained by acquiring the parameters pre-stored in the memory. For example, when the air conditioner is in the capacity test mode, the target exhaust temperature can adopt a fixed temperature value to test the operating parameters of the air conditioner when it meets the capacity and energy efficiency requirements. Since the target exhaust temperature remains unchanged in this mode, it can be considered that the target exhaust temperature of the compressor is in a stable state at this time.

[0063] In addition, the target exhaust temperature can also be the theoretical value of the exhaust temperature determined according to the current operating conditions of the air conditioner. The characteristic parameters of the current operating conditions of the air conditioner (such as compressor frequency, fan speed, etc.) can be acquired, and the target exhaust temperature can be calculated based on the acquired characteristic parameters. The operating conditions of the air conditioner are determined according to the difference between the ambient temperature and the target temperature. As the air conditioner continuously operates to adjust the ambient temperature to reach the target temperature, the operating conditions of the air conditioner tend to be stable, and thus the target exhaust temperature also tends to be stable. For example, in the current operating conditions of the air conditioner, when the variance of the target exhaust temperature within the preset monitoring duration is less than the preset variance threshold, it can be considered that the target exhaust temperature of the current compressor is in a stable state. Or, within the preset monitoring duration, if the difference between the maximum value and the minimum value of the target exhaust temperature is less than the preset difference threshold, it can also be considered that the target exhaust temperature of the current compressor is in a stable state.

[0064] It can be understood that for each interval of the first duration, the parameter used to adjust the opening degree of the electronic expansion valve can be the actual exhaust temperature obtained within the first duration, or the actual exhaust temperature obtained before and after the first duration. For example, the actual exhaust temperature is continuously detected within the first duration, and multiple actual exhaust temperatures within the first duration are continuously acquired, and the opening degree of the electronic expansion valve is adjusted using the multiple actual exhaust temperatures within the first duration. Another example is that the actual exhaust temperature before the first duration and the current actual exhaust temperature can be acquired, which is equivalent to comprehensively adjusting the electronic expansion valve using the actual exhaust temperature corresponding to the previous adjustment moment and the actual exhaust temperature corresponding to the current adjustment moment. Taking the actual exhaust temperature as the adjustment basis and periodically adjusting the opening degree of the electronic expansion valve can enable the actual exhaust temperature to quickly approach the target exhaust temperature, which helps to improve the reliability of the operation of the air conditioner.

[0065] It is understandable that the change of the exhaust temperature of the compressor requires a response time, that is, after adjusting the opening of the electronic expansion valve, the exhaust temperature of the compressor keeps changing, and it takes a period of response time for the exhaust temperature to stabilize. Depending on the performance of the air conditioner, the value of the current exhaust temperature of the compressor, or the adjustment range of the electronic expansion valve, the time required for the exhaust temperature change to stabilize is different, but currently, the opening of the electronic expansion valve is usually adjusted and controlled at a fixed time interval, that is, a fixed cycle, resulting in the exhaust temperature obtained not being a value in a stable state, and unable to accurately reflect the actual operating conditions of the current air conditioner, and having low reliability. It is difficult to accurately adjust the exhaust temperature that is still in a changing state as the parameter basis for adjusting the electronic expansion valve, that is, the accuracy of the number of steps adjusted by the opening of the electronic expansion valve is low, and it is easy to over-adjust, resulting in rapid changes in the exhaust temperature and difficulty in stabilizing at the target exhaust temperature, which then reacts to the opening control of the electronic expansion valve, causing the electronic expansion valve to oscillate and fluctuate, affecting the stable operation of the air conditioner.

[0066] Reference Figure 2 , Figure 2 Schematic diagram of the change of actual exhaust temperature provided by the embodiment of the present invention. Figure 2 As shown in the figure, when the target exhaust temperature is in a stable state, the target exhaust temperature can be regarded as a fixed temperature value. The actual exhaust temperature changes continuously with the regulation and control of the electronic expansion valve. When the opening of the electronic expansion valve is adjusted for the first time, although the actual exhaust temperature is lower than the target exhaust temperature, the actual exhaust temperature at this time is rising rapidly. Therefore, according to the pre-set control strategy of the electronic expansion valve, the opening of the electronic expansion valve is increased and adjusted to slow down the rising speed of the actual exhaust temperature, in an attempt to stabilize the actual exhaust temperature at the target exhaust temperature.

[0067] After the first time interval, when the second opening adjustment is required, the actual exhaust temperature increases and then decreases due to the increase in the opening of the electronic expansion valve during the last opening adjustment. The actual exhaust temperature is still lower than the target exhaust temperature, and the actual exhaust temperature is on a downward trend. Therefore, according to the preset control strategy, the opening of the electronic expansion valve is reduced. When the opening of the electronic expansion valve is reduced, the actual exhaust temperature will increase and the rate of increase of the actual exhaust temperature will be increased, resulting in the opening of the electronic expansion valve being increased again according to the preset control strategy after the first time interval, so that the actual exhaust temperature fluctuates continuously during the long adjustment process. It can be seen that at the time of adjusting the electronic expansion valve, the actual exhaust temperature is still in a fluctuating state, that is, it has not stabilized. When the actual exhaust temperature at this time is used to adjust the electronic expansion valve, it is difficult to accurately stabilize the actual exhaust temperature at the target exhaust temperature.

[0068] Therefore, by using the change trend of the actual exhaust gas temperature within multiple consecutive first time durations to determine whether the actual exhaust gas temperature is changing towards a direction close to the target exhaust gas temperature, it is equivalent to using the change trend of the actual exhaust gas temperature within the second time duration to determine whether the current actual exhaust gas temperature is in a fluctuating state, determining whether the current first time duration is sufficient to make the change of the actual exhaust gas temperature tend to be stable, and then adjusting the first time duration, that is, adjusting the control period of the electronic expansion valve, so as to be able to provide a sufficient and appropriate time interval to make the actual exhaust gas temperature tend to be stable after adjusting the opening degree of the electronic expansion valve.

[0069] Among them, the change trend of the actual exhaust gas temperature can calculate the corresponding curve slope according to multiple actual exhaust gas temperatures within the first time duration.

[0070] Refer to Figure 3 , Figure 3 FIG. is a schematic diagram of the change of the actual exhaust gas temperature after adjusting the first time duration provided by an embodiment of the present invention. Through the obtained change trend of the actual exhaust gas temperature, it is judged that the current actual exhaust gas temperature is in a fluctuating state, that is, the current first time duration is not sufficient to make the actual exhaust gas temperature tend to be stable after adjusting the opening degree of the electronic expansion valve, so as to adjust the time of the first time duration. As Figure 3 shown, during the first to fourth opening degree adjustments of the electronic expansion valve, the first fixed time T1 is used as the first time duration, and the electronic expansion valve is adjusted periodically. It can be seen that within the time of the first four opening degree adjustments, when the opening degree is adjusted, the actual exhaust gas temperature is still in a rapidly changing trend. Therefore, within the time of the first four opening degree adjustments, the actual exhaust gas temperature shows obvious fluctuations and cannot be stabilized at the target exhaust gas temperature. Therefore, according to the change trend of the actual exhaust gas temperature between the moment of the third opening degree adjustment of the electronic expansion valve and the moment of the fourth opening degree adjustment, the first time duration can be adjusted by delaying, that is, increasing the first time duration and extending the control period of the electronic expansion valve, and using the second fixed time T2 as the new first time duration.

[0071] Therefore, after the fourth opening degree adjustment of the electronic expansion valve, the opening degree adjustment is performed again every second fixed time T2. It can be seen that the actual exhaust gas temperature TC2 corresponding to the second fixed time T2 (i.e., the updated fifth adjustment moment shown in Figure 3 ) from the fourth opening degree adjustment moment is compared with the first fixed time T1 (i.e., as shown in Figure 3The actual exhaust gas temperature TC1 corresponding to the fifth adjustment moment before the update shown is closer to the target exhaust gas temperature, and the rising trend (curve slope) of the actual exhaust gas temperature is gentler, enabling more reliable actual exhaust gas temperature data to be obtained, which helps to more accurately adjust the opening degree of the electronic expansion valve. Therefore, adjusting the control period of the electronic expansion valve based on the change trend of the actual exhaust gas temperature can make the actual exhaust gas temperature tend to be stable after adjusting the opening degree of the electronic expansion valve, avoid over-adjusting the opening degree of the electronic expansion valve and causing the actual exhaust gas temperature to deviate far from the target exhaust gas temperature, and also avoid the control period of the electronic expansion valve being too long and affecting the adjustment efficiency. It helps to reduce the frequent change phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust gas temperature, accelerate the opening degree of the electronic expansion valve to tend to be stable and at the same time accelerate the actual exhaust gas temperature to stabilize at the target exhaust gas temperature, enabling the air-conditioning system to quickly reach the required target operating conditions and improving the reliability of air-conditioning operation.

[0072] It can be understood that due to the hysteresis of the change of the actual exhaust gas temperature, the actual exhaust gas temperature within a single control period of the electronic expansion valve cannot accurately reflect the change of the actual exhaust gas temperature after the adjustment of the electronic expansion valve. Therefore, by continuously obtaining the actual exhaust gas temperature within multiple consecutive first time periods (i.e., the second time period), the change trend of the actual exhaust gas temperature within multiple consecutive control periods of the electronic expansion valve is used to determine whether the change of the actual exhaust gas temperature tends to be stable or the actual exhaust gas temperature is in a fluctuating state during this opening degree adjustment process. If during this opening degree adjustment process, the change of the actual exhaust gas temperature tends to be stable as the number of adjustments increases, it indicates that the current first time period is close to the response time of the change of the actual exhaust gas temperature. Using the current first time period as the control period of the electronic expansion valve can reduce the fluctuation of the actual exhaust gas temperature and help adjust the actual exhaust gas temperature to the target exhaust gas temperature and stabilize at the target exhaust gas temperature. If during this opening degree adjustment process, the change trend of the actual exhaust gas temperature is relatively intense, that is, the actual exhaust gas temperature is in a fluctuating state, it indicates that the current first time period does not provide sufficient time for the actual exhaust gas temperature to tend to be stable, that is, the current first time period is short. Therefore, the first time period can be adjusted to be extended to reduce the fluctuation of the actual exhaust gas temperature. If during this opening degree adjustment process, the change trend of the actual exhaust gas temperature is gentle and remains at a certain temperature value for some time, it can be considered that the current first time period is long. Although the actual exhaust gas temperature reflected after the opening degree adjustment can be obtained more accurately, the adjustment efficiency is low and cannot meet the usage requirements. Therefore, the first time period can be adjusted to be reduced, that is, the control period of the electronic expansion valve is shortened.

[0073] It can be understood that during the process of adjusting the first duration, the analysis of the change trend can be based on all the actually obtained exhaust gas temperatures, that is, including the actually obtained exhaust gas temperatures corresponding to the first durations with different duration values. Equivalently, the second duration can include multiple first durations with different duration values. By using all the actually obtained exhaust gas temperatures in the historical record, a comprehensive analysis of the change trend can be carried out, and the current change trend of the actually obtained exhaust gas temperature can be more accurately inferred, so as to more accurately adjust the first duration.

[0074] It can be understood that the second duration can include multiple first durations that are consecutive and have equal corresponding duration values. During the process of adjusting the first duration, the analysis of the change trend can be based on the actually obtained exhaust gas temperatures within multiple first durations that are consecutive and have equal corresponding duration values. The actually obtained exhaust gas temperatures corresponding to the control cycles with the same time interval can be more intuitively compared and analyzed, and it is easier and more accurate to judge the change trend of the actually obtained exhaust gas temperature. The control cycles with different time intervals indicate that the time interval corresponding to the previous control cycle is unreasonable, and the change trend of the corresponding actually obtained exhaust gas temperature is in a fluctuating state, which is likely to interfere with the analysis of the change trend of the actually obtained exhaust gas temperature corresponding to the subsequent control cycle. At the same time, it can also avoid misanalysis due to the lack of the data sample size (the data volume of the actually obtained exhaust gas temperatures) after the adjustment of the first duration, which affects the accuracy of the opening adjustment. For example, when the number of the first durations that are consecutive and have equal corresponding duration values meets 6, it can be considered that the data sample size of the actually obtained exhaust gas temperatures is sufficient, and it can be more accurately judged whether the actually obtained exhaust gas temperature is fluctuating or whether the change trend of the actually obtained exhaust gas temperature tends to be stable through the change trend of these actually obtained exhaust gas temperatures, so as to determine whether it is necessary to adjust the first duration. Equivalently, after adjusting the first duration (such as extending the first duration), recalculate the number of the first durations, and avoid using the actually obtained exhaust gas temperatures corresponding to the control cycles with different time intervals for analysis.

[0075] Refer to Figure 4 , in the adjustment method provided in the embodiment of the present invention, in Figure 1 the step S300 shown, the step S300 includes step S310 and step S320:

[0076] Step S310: When there are both maximum values or minimum values in the actually obtained exhaust gas temperatures within multiple consecutive first durations, and all the maximum values and all the minimum values appear alternately, compare the differences between any two of all the maximum values and all the minimum values to obtain a difference comparison result.

[0077] Step S320: Adjust the first duration according to the difference comparison result.

[0078] It can be understood that the second duration can be composed of a fixed number of consecutive first durations. However, not all consecutive first durations can be the constituent elements of the second duration. That is to say, the duration between two adjacent moments of updating the first duration is dynamic. The second duration needs to be determined according to the actual exhaust temperature within the first duration. That is, the second duration is determined by selecting multiple consecutive first durations from multiple first durations as the constituent elements of the second duration according to the actual exhaust temperature within each first duration. Therefore, it is necessary to judge according to the actual exhaust temperature of multiple consecutive first durations to determine whether each first duration meets the constituent elements of the second duration and whether there is a second duration among multiple consecutive first durations. Therefore, every time the first duration elapses, not only the opening of the electronic expansion valve is adjusted by using the obtained actual exhaust temperature, but also the maximum temperature and the minimum temperature within the actual exhaust temperature in a first duration before this opening adjustment are obtained. If the maximum temperature or the minimum temperature is not obtained at the moment of opening adjustment, it can be considered that there is a maximum value or a minimum value in the actual exhaust temperature in a first duration before this opening adjustment. Then, it can be further judged whether there are maximum values or minimum values in the corresponding actual exhaust temperatures within multiple (the number can be adjusted according to the actual situation) consecutive first durations before this opening adjustment. Otherwise, it means that the maximum temperature or the minimum temperature is obtained at the moment of opening adjustment, that is, it can be considered that the actual exhaust temperature in a first duration before this opening adjustment is still in a continuous rising or continuous falling trend, and the current actual exhaust temperature is not close to the target exhaust temperature, so there is no need to adjust the first duration.

[0079] Meanwhile, it is also possible to determine whether the extreme value corresponding to the actual exhaust gas temperature within a first duration before the current opening adjustment is opposite to the adjacent extreme value, that is, whether the maximum value and the minimum value appear alternately. If the maximum value and the minimum value do not appear alternately, it indicates that the current actual exhaust gas temperature remains in the rising or falling stage close to the target exhaust gas temperature and is not in a fluctuating state, and there is no need to adjust the first duration. If there are maximum or minimum values in the actual exhaust gas temperature corresponding to multiple consecutive first durations, and all the maximum values and all the minimum values appear alternately, it indicates that the actual exhaust gas temperature is in a fluctuating state within multiple consecutive first durations. By comparing the differences between all the maximum values and all the minimum values, it is possible to determine whether the actual exhaust gas temperature is close to the target exhaust gas temperature, that is, to determine whether the fluctuation converges. Specifically, by comparing the differences between all pairs of maximum values, a first comparison result of all the maximum values can be obtained, and the first comparison result can characterize the stability of the maximum temperature value of the actual exhaust gas temperature. At the same time, by comparing the differences between all pairs of minimum values, a second comparison result of all the minimum values can be obtained, and the second comparison result can characterize the stability of the minimum temperature value of the actual exhaust gas temperature. In addition, by comparing the difference between any one maximum value and any one minimum value, a third comparison result of all the extreme values can be obtained, and the third comparison result can characterize the fluctuation amplitude of the actual exhaust gas temperature. The difference comparison result can be obtained by synthesizing the first comparison result, the second comparison result, and the third comparison result, which can accurately infer whether the change of the actual exhaust gas temperature tends to be stable and whether the fluctuation converges. It is equivalent to that the second duration is multiple consecutive target durations, and there are maximum or minimum values in the actual exhaust gas temperature within the target duration, and all the maximum values and all the minimum values appear alternately.

[0080] When the difference comparison result reflects that the fluctuation of the actual exhaust gas temperature is in a converging state, the first duration can be adjusted to accelerate the stabilization of the actual exhaust gas temperature. Otherwise, it is considered that the fluctuation of the actual exhaust gas temperature may be a situation of gradually stabilizing after the opening adjustment, and there is no need to adjust the first duration, and the current first duration is maintained. Therefore, using the difference comparison result obtained by comparing the differences of multiple extreme values to judge the fluctuation of the actual exhaust gas temperature can help to adjust the first duration more accurately, accelerate the stabilization of the actual exhaust gas temperature, and reduce the oscillation fluctuation of the electronic expansion valve.

[0081] Referring to Figure 5 , in the adjustment method provided in the embodiment of the present invention, in Figure 4 the step S320 shown, the step S320 may include at least one of the steps S321, S322, and S323:

[0082] Step S321: When the difference comparison result is that the difference between any two maximum values is less than the first preset value and the difference between any two minimum values is less than the first preset value, increase the first duration.

[0083] Step S322: When the difference comparison result is that the difference between any one maximum value and any one minimum value is less than the second preset value, increase the first duration.

[0084] Step S323: When the difference comparison result is that the difference between any two maximum values is less than the first preset value, the difference between any two minimum values is less than the first preset value, and the difference comparison result is that the difference between any one maximum value and any one minimum value is less than the second preset value, increase the first duration.

[0085] It can be understood that by extracting any two extreme values from all the maximum values and all the minimum values for difference comparison, when the difference between all the maximum values is less than the first preset value and the difference between all the minimum values is less than the first preset value, it can be considered that within multiple consecutive first durations with equal corresponding duration values, both the temperature maximum value and the temperature minimum value of the actual exhaust temperature tend to be stable, and the change of the actual exhaust temperature is relatively gentle. That is, by increasing the first duration, sufficient time can be provided for the actual exhaust temperature to change slowly, getting closer to the target exhaust temperature, and accelerating the stabilization of the actual exhaust temperature at the target exhaust temperature.

[0086] When any one maximum value is compared with any one minimum value, if the difference between each maximum value and each minimum value is less than the second preset value, it indicates that the fluctuation range of the actual exhaust temperature is small at this time, and it is already close to the target exhaust temperature and fluctuates around the target exhaust temperature. Therefore, by increasing the first duration, sufficient response time can be provided for the actual exhaust temperature to change and stabilize, fully reflecting the opening adjustment effect of the electronic expansion valve, which helps to adjust the opening of the electronic expansion valve.

[0087] In addition, the above multiple comparison results can be comprehensively used as the delay judgment condition for the first duration, that is, only when both the temperature maximum value and the temperature minimum value of the actual exhaust temperature tend to be stable and the fluctuation range of the actual exhaust temperature is small, can it be accurately determined that the actual exhaust temperature is in a state of fluctuating convergence and the adjustment time needs to be extended. Therefore, the first duration is increased. At this time, if it does not meet the condition that the difference between any two maximum values is less than the first preset value, or the difference between any two minimum values is less than the first preset value, or the difference comparison result is that the difference between any one maximum value and any one minimum value is less than the second preset value (the second preset value is greater than the first preset value), it is considered that the current fluctuation of the actual exhaust temperature does not converge and there is no need to extend the adjustment time.

[0088] Specifically, when the actual exhaust gas temperatures within N consecutive first time durations all have extreme values, that is, the second time duration can be composed of multiple first time durations corresponding to the actual exhaust gas temperatures having extreme values, then it can be determined whether the first condition, the second condition, and the third condition are simultaneously satisfied; where N is a natural number greater than 2, the extreme values include maximum values and minimum values, the first condition is: the number of extreme value alternations reaches N - 2, the initial value of the number of extreme value alternations is zero, when the actual exhaust gas temperatures within two adjacent first time durations respectively have a maximum value and a minimum value, the value of the number of extreme value alternations is incremented by one; the second condition is: the difference between any two maximum values and the difference between any two maximum values are both less than a first preset value; the third condition is: the difference between any one maximum value and any one minimum value is less than a second preset value; when the first condition, the second condition, and the third condition are simultaneously satisfied, the first time duration is increased. Wherein, when it is determined to increase the first time duration, the number of extreme value alternations is cleared; at the same time, when the actual exhaust gas temperatures within two adjacent first time durations both have a maximum value or a minimum value, the number of extreme value alternations is cleared.

[0089] Refer to Figure 6 , Figure 6 is a schematic diagram of the change in the actual exhaust gas temperature that satisfies the condition for increasing the first time duration provided by an embodiment of the present invention. As Figure 6 shown, there is a first maximum value TC1 in the actual exhaust gas temperature between the first opening adjustment moment and the second opening adjustment moment, there is a second minimum value TC2 in the actual exhaust gas temperature between the second opening adjustment moment and the third opening adjustment moment, there is a third maximum value TC3 in the actual exhaust gas temperature between the third opening adjustment moment and the fourth opening adjustment moment, there is a fourth minimum value TC4 in the actual exhaust gas temperature between the fourth opening adjustment moment and the fifth opening adjustment moment, and there is a fifth maximum value TC5 in the actual exhaust gas temperature between the fifth opening adjustment moment and the sixth opening adjustment moment, that is, the actual exhaust gas temperatures within 6 consecutive first time durations all have extreme values, and these 6 consecutive first time durations are all spaced apart by a first fixed time T1. At the same time, the number of times the maximum value and the minimum value alternate is 5 times, that is, the number of extreme value alternations reaches 5, satisfying the first condition. Among them, the difference between any two of the first maximum value TC1, the third maximum value TC3, and the fifth maximum value TC5 is less than 1, and the difference between the second minimum value TC2 and the fourth minimum value TC4 is less than 1, that is, the second condition is satisfied. In addition, the difference between any one maximum value (the first maximum value TC1, the third maximum value TC3, and the fifth maximum value TC5) and any one minimum value (the second minimum value TC2 and the fourth minimum value TC4) is less than 3, that is, the third condition is satisfied. At this time, when the first condition, the second condition, and the third condition are simultaneously satisfied, the first time duration is extended to a second fixed time T2. Therefore, after the sixth opening adjustment, the electronic expansion valve is adjusted in terms of its opening every second fixed time T2 (the updated first time duration) according to the actual exhaust gas temperature.

[0090] Referring to Figure 7 , in the adjustment method provided by the embodiment of the present invention, during the process of increasing the first duration, steps S330 and S340 may be included:

[0091] Step S330: Obtain a first delay duration according to the extreme value occurrence time of the maximum or minimum value existing in the actual exhaust temperature within the corresponding first duration.

[0092] Step S340: Increase and adjust the first duration based on the first delay duration.

[0093] It can be understood that in the case where it has been determined that the first duration needs to be extended, by analyzing the extreme value occurrence time of the maximum or minimum value within the first duration, the moment when the maximum effect brought by the opening adjustment of the electronic expansion valve can be determined, that is, the moment when the actual exhaust temperature fluctuates and turns. By extending the corresponding extreme value occurrence time, the extreme value occurrence time can be made closer to the opening adjustment time, which means that when the opening of the electronic expansion valve is adjusted, the actual exhaust temperature is already close to being stable, and it can reflect the maximum effect brought by the opening adjustment of the electronic expansion valve. Therefore, the extreme value occurrence time can be used as the first delay duration to increase and adjust the first duration.

[0094] It should be noted that the first delay duration can be determined according to the positional relationship of the extreme value occurrence time within the corresponding first duration. Specifically, it can be determined according to the duration between the extreme value occurrence time and the start time of the corresponding first duration (i.e., the previous opening adjustment time), or according to the duration between the extreme value occurrence time and the end time of the corresponding first duration (i.e., the current opening adjustment time), or it can also be determined according to the duration between the extreme value occurrence time and the middle node time of the corresponding first duration.

[0095] Referring to Figure 8 , in the adjustment method provided by the embodiment of the present invention, in Figure 7 the shown step S330, step S330 further includes step S350:

[0096] Step S350: Obtain a first delay duration according to the duration between the extreme value occurrence time of the maximum or minimum value existing in the actual exhaust temperature within the corresponding first duration and the start time of the corresponding first duration.

[0097] It can be understood that the first delay duration can be determined based on the duration between the previous opening adjustment time (i.e., the starting time corresponding to the first duration) and the extreme value occurrence time. The extreme value occurrence time can refer to the occurrence time corresponding to the extreme value of the actual exhaust gas temperature within the duration between the previous opening adjustment time and the current opening adjustment time, or it can refer to the occurrence times corresponding to multiple extreme values within the duration between multiple historical opening adjustment times. This extreme value occurrence time is the time when the actual exhaust gas temperature tends to be stable after two consecutive historical opening adjustments, that is, ignoring the influence of the previous opening adjustment, the extreme value occurrence time is the time when the actual exhaust gas temperature changed by the second opening adjustment before the current opening adjustment tends to be stable. Therefore, using the duration between the extreme value occurrence time and the starting time of the corresponding first duration as the first delay duration to compensate the first duration can help make the actual exhaust gas temperature tend to be stable after the opening adjustment. After the update compensation, the actual exhaust gas temperature changed by the previous opening adjustment will tend to be stable within the first duration.

[0098] Referring to Figure 6 , it can be seen that the fifth maximum value TC5 appears at 1 / 3 of the first fixed time T1 between the fifth opening adjustment time and the sixth opening adjustment time. Therefore, the duration between the fifth opening adjustment time and the extreme value occurrence time (i.e., 1 / 3 of the first fixed time T1) can be used as the first delay duration to increase the first duration (the first fixed time T1). The increased first duration is (T1 + 1 / 3T1).

[0099] Referring to Figure 9 , in the adjustment method provided in the embodiment of the present invention, in Figure 7 shown in step S330, step S330 further includes step S360 and step S370:

[0100] Step S360: Based on multiple consecutive first durations, obtain multiple second delay durations according to the extreme value occurrence times of all maximum values and all minimum values in the corresponding first durations.

[0101] Step S370: Perform an average calculation or a weighted summation calculation on all the second delay durations to obtain the first delay duration.

[0102] It can be understood that the first delay duration can also be calculated based on the occurrence times of all extreme values within multiple consecutive first durations. Specifically, multiple second delay durations are determined according to the durations between the initial time and the occurrence time of each extreme value within the corresponding first duration. Then, an average calculation is performed on all the second delay durations, or a weighted summation calculation is performed on all the second delay durations to obtain the first delay duration. Among them, the weight values of the respective second delay durations can increase with the extension of time. For example, as Figure 6 shown, the first maximum value TC1 corresponds to determining the delay duration TP1, the second minimum value TC2 corresponds to determining the delay duration TP2, the third maximum value TC3 corresponds to determining the delay duration TP3, the fourth minimum value TC4 corresponds to determining the delay duration TP4, and the fifth maximum value TC5 corresponds to determining the delay duration TP5. That is, the weight value corresponding to the delay duration TP1 is the smallest, the weight value corresponding to the delay duration TP5 is the largest, and the weight values corresponding to the remaining delay durations increase with time. Furthermore, a weighted summation calculation is performed on all the delay durations based on the weight values of the respective delay durations to obtain the first delay duration.

[0103] Referring to Figure 10 , in the adjustment method provided in the embodiment of the present invention, in Figure 1 the step S300 shown in, the step S300 further includes a step S380:

[0104] Step S380: When the difference between the actual exhaust gas temperature and the target exhaust gas temperature is less than a third preset value, update the first duration according to the change trend of the actual exhaust gas temperature within the second duration.

[0105] It can be understood that in order to avoid excessive adjustment of the first duration, it is necessary to first determine whether the actual exhaust gas temperature is already close to the target exhaust gas temperature, that is, it can be determined whether the difference between the actual exhaust gas temperature and the target exhaust gas temperature is less than a third preset value. When the difference between the actual exhaust gas temperature and the target exhaust gas temperature is less than the third preset value, it indicates that the actual exhaust gas temperature is already close to the target exhaust gas temperature. The change trend of the actual exhaust gas temperature within the second duration can be determined, and then the first duration can be adjusted using the change trend. Since the change trend of the actual exhaust gas temperature depends on the real-time analysis of the continuously acquired actual exhaust gas temperature, adding a prerequisite judgment condition for the analysis of the change trend can help reduce the data processing volume and avoid incorrect adjustment of the first duration, so that the actual exhaust gas temperature deviates from the target exhaust gas temperature. By adjusting the control period of the electronic expansion valve when the actual exhaust gas temperature is close to the target exhaust gas temperature, it is avoided that the time with a fixed time as the control period is too short when approaching the target exhaust gas temperature, which is likely to cause fluctuations in the exhaust gas temperature. Thus, the change trend of the actual exhaust gas temperature is used to determine whether the first duration is too short, and then it is decided whether to extend the first duration.

[0106] Reference Figure 11 , in the adjustment method provided in the embodiments of the present invention, in Figure 1 the step S200 shown, the step S200 may include at least one of the steps S210, S220, S230, and S240:

[0107] Step S210: When the actual exhaust gas temperature is greater than the target exhaust gas temperature, the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fourth preset value and less than the fifth preset value, and the actual exhaust gas temperature shows an upward trend within the corresponding first time period, increase the opening degree of the electronic expansion valve;

[0108] Step S220: When the actual exhaust gas temperature is greater than the target exhaust gas temperature and the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fifth preset value, increase the opening degree of the electronic expansion valve;

[0109] Step S230: When the actual exhaust gas temperature is less than the target exhaust gas temperature, the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fourth preset value and less than the fifth preset value, and the actual exhaust gas temperature shows a downward trend within the corresponding first time period, decrease the opening degree of the electronic expansion valve;

[0110] Step S240: When the actual exhaust gas temperature is less than the target exhaust gas temperature and the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fifth preset value, decrease the opening degree of the electronic expansion valve.

[0111] It can be understood that, according to the magnitude relationship between the actual exhaust gas temperature and the target exhaust gas temperature, the difference between the actual exhaust gas temperature and the target exhaust gas temperature, and / or the change trend of the actual exhaust gas temperature within the corresponding first time period, the opening degree of the electronic expansion valve is adjusted.

[0112] Specifically, the fourth preset value may be 0.5, and the fifth preset value is 1.5. When the difference between the actual exhaust gas temperature and the target exhaust gas temperature is less than the fourth preset value, it can be considered that the fluctuation converges, and the current opening degree of the electronic expansion valve is maintained.

[0113] When the actual exhaust gas temperature is less than the target exhaust gas temperature, the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fourth preset value and less than the fifth preset value, and the actual exhaust gas temperature shows an upward trend within the corresponding first time period, it can be considered that the fluctuation converges, and the actual exhaust gas temperature can slowly rise and stabilize at the target exhaust gas temperature. Therefore, the current opening degree of the electronic expansion valve is maintained.

[0114] When the actual exhaust gas temperature is greater than the target exhaust gas temperature, the difference between the actual exhaust gas temperature and the target exhaust gas temperature is greater than the fourth preset value and less than the fifth preset value, and the actual exhaust gas temperature shows a downward trend within the corresponding first time period, it can be considered that the fluctuation converges, and the actual exhaust gas temperature can slowly decrease and stabilize at the target exhaust gas temperature. Therefore, the opening degree of the current electronic expansion valve is maintained.

[0115] When the difference obtained by subtracting the target exhaust gas temperature from the actual exhaust gas temperature is within the range of [0.5, 1.5], and the actual exhaust gas temperature shows an upward trend within the corresponding first time period, it can be considered that the fluctuation does not converge, and the actual exhaust gas temperature cannot stabilize at the target exhaust gas temperature. Therefore, the opening degree of the current electronic expansion valve is increased to reduce the actual exhaust gas temperature to be close to the target exhaust gas temperature.

[0116] When the difference obtained by subtracting the target exhaust gas temperature from the actual exhaust gas temperature is greater than 1.5, it can be considered that the fluctuation does not converge, and the actual exhaust gas temperature cannot stabilize at the target exhaust gas temperature. Therefore, the opening degree of the current electronic expansion valve is increased.

[0117] When the difference obtained by subtracting the target exhaust gas temperature from the actual exhaust gas temperature is within the range of [-1.5, -0.5], and the actual exhaust gas temperature shows a downward trend within the corresponding first time period, it can also be considered that the fluctuation does not converge, and the actual exhaust gas temperature cannot stabilize at the target exhaust gas temperature. Therefore, the opening degree of the electronic expansion valve is reduced.

[0118] When the difference obtained by subtracting the target exhaust gas temperature from the actual exhaust gas temperature is less than -1.5, it can be considered that the fluctuation does not converge, and the opening degree of the electronic expansion valve can be reduced.

[0119] In a second aspect, referring to Figure 12 , Figure 12 is a schematic structural diagram of an operation control device provided by an embodiment of the present invention. An embodiment of the present invention provides an operation control device 1200, including a memory 1220, a processor 1210, and a computer program stored on the memory 1220 and executable on the processor 1210. The processor 1210 executes the program to implement the adjustment method of the electronic expansion valve of the air conditioner in the first aspect embodiment above. For example, execute Figure 1 the method steps S100, step S200, and step S300 in, or execute Figure 4 the method steps S310 and step S320 in, or execute Figure 5 the method steps S321, step S322, and step S323 in, or execute Figure 7 the method steps S330 and step S340 in, or execute Figure 8 the method step S350 in, or execute Figure 9 the method steps S360 and step S370 in, or execute Figure 10the method step S380 in, or execute Figure 11 the method steps S210, S220, S230 and S240 in.

[0120] According to the operation control device provided by the embodiments of the present invention, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening degree of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period after adjusting the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening degree of the electronic expansion valve to tend to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating conditions and improve the reliability of the air conditioner operation.

[0121] In a third aspect, an embodiment of the present invention provides an air conditioner, including an electronic expansion valve, a compressor, and the operation control device as described in the second aspect embodiment above.

[0122] According to the air conditioner provided by the embodiments of the present invention, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening degree of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period after adjusting the electronic expansion valve to make the actual exhaust temperature tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, and can accelerate the opening degree of the electronic expansion valve to tend to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating conditions and improve the reliability of the air conditioner operation.

[0123] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, and the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the adjustment method of the electronic expansion valve of the air conditioner as described in the first aspect embodiment above, for example, execute Figure 1 the method steps S100, S200, and S300 in, or execute Figure 4 the method steps S310 and S320 in, or execute Figure 5 the method steps S321, S322 and S323 in, or execute Figure 7the method steps S330 and S340 in, or execute Figure 8 the method step S350 in, or execute Figure 9 the method steps S360 and S370 in, or execute Figure 10 the method step S380 in, or execute Figure 11 the method steps S210, S220, S230 and S240 in.

[0124] According to the computer-readable storage medium provided by the embodiments of the present invention, by monitoring the actual exhaust temperature of the compressor in real time when the target exhaust temperature is in a stable state, and adjusting the opening degree of the electronic expansion valve based on the actual exhaust temperature every first time period, the actual exhaust temperature of the compressor can approach the target exhaust temperature. Since the change of the actual exhaust temperature has hysteresis, and using the change trend of the actual exhaust temperature within the second time period to adjust the first time period can provide an appropriate time period after adjusting the electronic expansion valve for the actual exhaust temperature to tend to be stable, which helps to reduce the change fluctuation phenomenon of the electronic expansion valve caused by the fluctuation of the actual exhaust temperature, can accelerate the opening degree of the electronic expansion valve to tend to be stable while accelerating the actual exhaust temperature to be stable at the target exhaust temperature, so that the air conditioner can quickly meet the required target operating conditions and improve the reliability of the air conditioner operation.

[0125] Those of ordinary skill in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware and their appropriate combinations. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium or a non-transitory medium and a communication medium or a transitory medium. As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules or other data. Computer storage media includes but is not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk DVD or other optical disk storage, magnetic cassette, tape, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium generally includes computer-readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0126] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A method for adjusting an electronic expansion valve of an air conditioner, characterized in that, the air conditioner further includes a compressor, and the method includes: When the target exhaust temperature of the compressor is in a stable state, obtain the actual exhaust temperature of the compressor; Every first time period, adjust the opening degree of the electronic expansion valve according to the actual exhaust temperature so that the actual exhaust temperature approaches the target exhaust temperature; Update the first time period according to the change trend of the actual exhaust temperature within a second time period, where the second time period includes a plurality of consecutive first time periods.

2. The adjustment method according to claim 1, characterized in that, the updating the first time period according to the change trend of the actual exhaust temperature within the second time period includes: When there are maximum values or minimum values in the actual exhaust temperature within a plurality of consecutive first time periods, and all the maximum values and all the minimum values appear alternately, perform a difference comparison on any two extreme values among all the maximum values and all the minimum values to obtain a difference comparison result; Adjust the first time period according to the difference comparison result.

3. The adjustment method according to claim 2, characterized in that, the adjusting the first time period according to the difference comparison result includes: When the difference comparison result is that the difference between any two maximum values is less than a first preset value and the difference between any two minimum values is less than the first preset value, increase the first time period.

4. The adjustment method according to claim 2, characterized in that, the adjusting the first time period according to the difference comparison result includes: When the difference comparison result is that the difference between any one maximum value and any one minimum value is less than a second preset value, increase the first time period.

5. The adjustment method according to claim 2, characterized in that, the adjusting the first time period according to the difference comparison result includes: When the difference comparison result is that the difference between any two maximum values is less than a first preset value, the difference between any two minimum values is less than the first preset value, and the difference comparison result is that the difference between any one maximum value and any one minimum value is less than a second preset value, increase the first time period; wherein, the second preset value is greater than the first preset value.

6. The adjustment method according to any one of claims 3 to 5, characterized in that, the increasing the first time period includes: According to the extreme value appearance time of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first time period, obtain a first delay time period; Based on the first delay time period, perform an increasing adjustment on the first time period.

7. The adjustment method according to claim 6, characterized in that, the obtaining a first delay time period according to the extreme value appearance time of the maximum value or the minimum value existing in the actual exhaust temperature in the corresponding first time period includes: Obtain a first delay duration based on the duration between the occurrence time of the maximum or minimum value in the actual exhaust temperature within the corresponding first duration and the start time of the corresponding first duration.

8. The adjustment method according to claim 6, wherein, the obtaining of the first delay duration according to the occurrence time of the maximum or minimum value in the actual exhaust temperature within the corresponding first duration includes: Based on multiple consecutive first durations, obtain multiple second delay durations according to the occurrence times of all the maximum values and all the minimum values in the corresponding first durations; Perform an average calculation or a weighted summation calculation on all the second delay durations to obtain the first delay duration.

9. The adjustment method according to claim 1, wherein, the updating of the first duration according to the change trend of the actual exhaust temperature within the second duration includes: When the difference between the actual exhaust temperature and the target exhaust temperature is less than a third preset value, update the first duration according to the change trend of the actual exhaust temperature within the second duration.

10. An operation control device, wherein, comprises a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the adjustment method of the electronic expansion valve according to any one of claims 1 to 9.

11. An air conditioner, wherein, comprises a compressor, an electronic expansion valve, and the operation control device according to claim 10.

12. A computer-readable storage medium, wherein, the computer-readable storage medium stores computer-executable instructions for causing a computer to execute the adjustment method of the electronic expansion valve according to any one of claims 1 to 9.

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