Method and device for controlling a fresh air valve of a fresh air air conditioner and fresh air air conditioner

Abstract

The present invention provides a method and device for controlling a fresh air valve of a fresh air air conditioner, and a fresh air air conditioner. The method includes the following steps: when the difference between a preset set temperature and an indoor return air temperature falls within different temperature difference ranges, corresponding evaporator pipe temperature preset ranges and corresponding fresh air valve preset openings are respectively determined; real-time detection of the outdoor fresh air temperature, indoor return air temperature, and evaporator pipe temperature; determining the operating mode of the fresh air air conditioner, and determining whether fresh air valve opening conditions are met based on the operating mode and a comparison result between the outdoor fresh air temperature and the indoor return air temperature; if not met, determining the temperature difference range within which the difference between the set temperature and the indoor return air temperature falls, and the evaporator pipe temperature preset range within which the evaporator pipe temperature falls; and adjusting the fresh air valve opening accordingly based on the judgment result of the first judgment step or the second judgment step in combination with the preset relationship in the preset step. The present invention improves the control accuracy of the fresh air valve, which is conducive to maintaining a stable indoor temperature.

Description

Technical Field

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

[0002] As users pay more attention to indoor air quality, fresh air air conditioners with fresh air function are becoming more and more popular. By turning on the fresh air function of the fresh air air conditioner, outdoor air can be brought into the room, achieving indoor and outdoor air circulation, thus ensuring fresh indoor air.

[0003] However, when bringing outdoor air into the room, outdoor heat will also enter the room, which can easily affect the indoor temperature and humidity, thereby destroying the indoor temperature stability and affecting the user experience. Summary of the Invention

[0004] In response to the above problems, the present invention provides a control method and device for a fresh air valve of a fresh air air conditioner and a fresh air air conditioner, which can accurately control the amount of fresh air entering the room, maintain the stability of the indoor temperature, and improve the user experience.

[0005] The present invention provides a method for controlling a fresh air valve of a fresh air air conditioner, comprising the following steps: a preset step: when the difference between the preset set temperature and the indoor return air temperature is in different temperature difference ranges, the corresponding evaporator tube temperature preset ranges and the corresponding fresh air valve preset openings are respectively corresponded; a detection step: real-time detection of the outdoor fresh air temperature, the indoor return air temperature and the evaporator tube temperature; a comparison step: comparing the size relationship between the outdoor fresh air temperature and the indoor return air temperature; a first judgment step: judging the operating mode of the fresh air air conditioner, and judging whether the fresh air air conditioner meets the fresh air valve opening condition based on the operating mode and the comparison result of the comparison step; a second judgment step: if the fresh air air conditioner does not meet the fresh air valve opening condition, judging the temperature difference range of the difference between the set temperature and the indoor return air temperature and the evaporator tube temperature preset range; a control step: adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step combined with the preset relationship in the preset step.

[0006] By combining the operating mode and comparing the outdoor fresh air temperature and the indoor return air temperature, it is possible to preliminarily determine whether to open the fresh air valve; when the conditions for opening the fresh air valve are not met, the opening of the fresh air valve is further adjusted accordingly based on the range of the difference between the set temperature and the indoor return air temperature and the preset range of the evaporator tube temperature, thereby improving the control accuracy of the fresh air valve, maintaining the stability of the indoor temperature, and enhancing the user experience.

[0007] In a preferred embodiment of the present invention, in the control step, the opening of the fresh air valve is adjusted according to the judgment result of the first judgment step, or the opening of the fresh air valve is adjusted accordingly according to the judgment result of the second judgment step combined with the preset relationship in the preset step: in the heating mode, the outdoor fresh air temperature is higher than the indoor return air temperature, and the fresh air air conditioner meets the fresh air valve opening conditions, then the opening of the fresh air valve is increased; in the cooling mode, the outdoor fresh air temperature is lower than the indoor return air temperature, and the fresh air air conditioner meets the fresh air valve opening conditions, then the opening of the fresh air valve is increased.

[0008] According to this technical solution, in cooling or heating mode, the outdoor fresh air temperature is lower or higher than the indoor return air temperature. Increasing the fresh air valve will facilitate the entry of cold or heat into the room, allowing the indoor temperature to reach the set level faster, which can save energy and improve user experience.

[0009] In an optional technical solution of the present invention, in the control step, adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step combined with the preset relationship in the preset step includes:

[0010] According to the temperature difference range between the set temperature and the indoor return air temperature, the corresponding evaporator tube temperature preset range is selected, and the opening of the fresh air valve is adjusted according to the comparison result between the evaporator tube temperature and the evaporator tube temperature preset range.

[0011] According to this technical solution, when determining the temperature difference range of the difference between the set temperature and the indoor return air temperature and the preset range of the evaporator tube temperature, the actual evaporator tube temperature is compared with the preset threshold of the evaporator tube temperature to adjust the opening of the fresh air valve, thereby improving the accuracy of the valve opening adjustment, facilitating precise control of the amount of fresh air entering the room, ensuring the indoor temperature, and improving the user experience.

[0012] In an optional technical solution of the present invention, in the preset step, one temperature difference range corresponds to n evaporator tube temperature preset thresholds, n+1 evaporator tube temperature preset ranges and n+1 fresh air valve preset openings.

[0013] According to this technical solution, by comparing the evaporator tube temperature with multiple evaporator tube temperature preset ranges, each evaporator tube temperature preset range corresponds to a fresh air valve preset opening, thereby improving the accuracy of the fresh air valve opening adjustment.

[0014] In an optional technical solution of the present invention, when the difference between the set temperature and the indoor return air temperature is within a specified temperature difference range, the evaporator tube temperature threshold increases and the preset opening of the fresh air valve increases.

[0015] According to this technical solution, when the evaporator tube temperature is higher or lower, it indicates that the heating or cooling effect is better at this time and can reach the set temperature faster. Correspondingly, the evaporator tube temperature threshold increases, and the preset opening of the fresh air valve also increases, which is conducive to bringing outdoor fresh air into the room to the greatest extent, maintaining the stability of the indoor temperature, and improving the user experience.

[0016] In an optional technical solution of the present invention, in the preset step, when the difference between the set temperature and the indoor return air temperature changes, the preset threshold value of the evaporator tube temperature changes accordingly.

[0017] According to this technical solution, the preset threshold of the evaporator tube temperature is adaptively changed according to the difference between the set temperature and the indoor return air temperature, which can avoid the difference from continuously failing to meet the matching preset range of the evaporator tube temperature, making the preset opening of the fresh air valve unreasonable and unable to accurately adjust the fresh air volume, thereby improving the accuracy of the fresh air volume adjustment.

[0018] In the optional technical solution of the present invention, in the preset step, if the fresh air air conditioner is in heating mode, when the difference between the set temperature and the indoor return air temperature increases, the evaporator tube temperature preset threshold increases; when the difference between the set temperature and the indoor return air temperature decreases, the evaporator tube temperature preset threshold decreases.

[0019] According to this technical solution, when the difference between the set temperature and the indoor return air temperature increases, that is, the heating capacity is poor, and the evaporator tube temperature takes a long time to reach the set temperature. By increasing the preset threshold of the evaporator tube temperature, the evaporator tube temperature can be prevented from reaching the original corresponding preset threshold range of the evaporator tube temperature, thereby reducing the preset opening of the fresh air valve to a lower opening, reducing the amount of fresh air introduced, and allowing the indoor return air temperature to reach the set value more quickly, thereby improving the heating effect. Similarly, when the difference between the set temperature and the indoor return air temperature decreases, it indicates that the heating capacity is still acceptable, and the evaporator tube temperature can rise to the set temperature more quickly. Reducing the preset threshold of the evaporator tube temperature can increase the preset opening of the fresh air valve to a higher opening, thereby increasing the fresh air volume, avoiding excessive increase in the evaporator tube temperature, and maintaining the stability of the indoor temperature.

[0020] In the optional technical solution of the present invention, in the preset step, if the fresh air air conditioner is in cooling mode, when the difference between the set temperature and the indoor return air temperature increases, the preset threshold value of the evaporator tube temperature decreases; when the difference between the set temperature and the indoor return air temperature decreases, the preset threshold value of the evaporator tube temperature increases.

[0021] According to this technical solution, the opening of the fresh air valve can be adaptively adjusted so that the indoor temperature reaches the set temperature faster, thereby improving the user's comfort experience.

[0022] The present invention further provides a control device for a fresh air valve of a fresh air air conditioner and a control method for operating the fresh air valve of the fresh air air conditioner.

[0023] The present invention further provides a fresh air air conditioner, comprising a control device for the fresh air valve of the fresh air air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of the fresh air air conditioner in an embodiment of the present invention.

[0025] Figure 2 This is a first flow chart of a method for controlling a fresh air valve of a fresh air air conditioner in an embodiment of the present invention.

[0026] Figure 3 This is a second flow chart of the method for controlling the fresh air valve of the fresh air air conditioner in an embodiment of the present invention.

[0027] Figure 4 This is a flow chart of a control method for a fresh air air conditioner running at a relatively small opening for a long time in an embodiment of the present invention.

[0028] Figure 5 Schematic diagram of the modular structure of the control device of the fresh air valve of the fresh air air conditioner in an embodiment of the present invention.

[0029] Reference numerals:

[0030] Outdoor unit 11; indoor unit 12; evaporator 121; centrifugal fan 122; fresh air inlet 123; return air inlet 124; filter 1251; sensor device 126; preset module 21; detection module 22; comparison module 23; first judgment module 24; second judgment module 25; control module 26. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] like Figure 1The figure shows a schematic diagram of the structure of a fresh air air conditioner in an embodiment of the present invention. The fresh air air conditioner includes an outdoor unit 11 and an indoor unit 12. The indoor unit 12 is connected to the outdoor unit 11 through a pipe 13. The indoor unit 12 includes an evaporator 121, a centrifugal fan 122, a fresh air inlet 123, and a return air inlet 124. The fresh air inlet 123 is located outdoors and connected to the return air inlet 124 of the indoor unit 12. A flow rate difference is formed between the circulating air blown out of the return air inlet 124 and the outdoor air introduced from the fresh air inlet 123, so that the indoor unit 12 draws fresh air from the fresh air inlet 123 into the room during the return air circulation, thereby improving the indoor air quality and affecting the indoor temperature and humidity. Furthermore, a fresh air valve (not shown in the figure) is provided near the fresh air inlet 123, which can adjust the amount of fresh air entering the room according to the opening of the fresh air valve. Furthermore, the indoor unit also includes a filter 125 and a humidifier 126. The air quality of the fresh air can be improved by filtering the incoming fresh air, and the fresh air can be humidified as needed to ensure the user's comfort experience.

[0033] See also Figure 2 As shown, the present invention provides a method for controlling a fresh air valve of a fresh air air conditioner, comprising the following steps: a preset step: when the difference between the preset set temperature and the indoor return air temperature is within different temperature difference ranges, the corresponding evaporator pipe temperature preset ranges and the corresponding fresh air valve preset openings are respectively determined; a detection step: real-time detection of the outdoor fresh air temperature, the indoor return air temperature, and the evaporator pipe temperature; a comparison step: comparing the magnitude relationship between the outdoor fresh air temperature and the indoor return air temperature; a first judgment step: judging the operating mode of the fresh air air conditioner, and judging whether the fresh air air conditioner meets the fresh air valve opening condition based on the operating mode and the comparison result of the comparison step; a second judgment step: if the fresh air air conditioner does not meet the fresh air valve opening condition, judging the temperature difference range within which the difference between the set temperature and the indoor return air temperature falls and the evaporator pipe temperature preset range within which the evaporator pipe temperature falls; a control step: adjusting the opening of the fresh air valve based on the judgment result of the first judgment step or adjusting the opening of the fresh air valve based on the judgment result of the second judgment step combined with the preset relationship in the preset step. It should be noted that, in this embodiment, adjusting the opening of the fresh air valve refers to adjusting it to the corresponding fresh air valve opening preset value.

[0034] By combining the operating mode and comparing the outdoor fresh air temperature and the indoor return air temperature, it is possible to preliminarily determine whether to open the fresh air valve; when the conditions for opening the fresh air valve are not met, the opening of the fresh air valve is further adjusted accordingly based on the range of the difference between the set temperature and the indoor return air temperature and the preset range of the evaporator tube temperature, thereby improving the control accuracy of the fresh air valve, maintaining the stability of the indoor temperature, and enhancing the user experience.

[0035] In a preferred embodiment of the present invention, in the control step, adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step in combination with the preset relationship in the preset step includes:

[0036] In heating mode, if the outdoor fresh air temperature is higher than the indoor return air temperature and the fresh air air conditioner meets the fresh air valve opening conditions, the opening of the fresh air valve will be increased;

[0037] In cooling mode, if the outdoor fresh air temperature is lower than the indoor return air temperature and the fresh air air conditioner meets the fresh air valve opening conditions, the opening of the fresh air valve will be increased.

[0038] Through the above method, in cooling or heating mode, the outdoor fresh air temperature is lower or higher than the indoor return air temperature. Increasing the fresh air valve is conducive to the entry of cold or heat into the room, so that the indoor temperature reaches the set level faster, which can not only save the energy consumption of the fresh air air conditioner, but also improve the user experience.

[0039] In a preferred embodiment of the present invention, in the control step, adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step combined with the preset relationship in the preset step includes: selecting the corresponding evaporator tube temperature preset threshold value according to the temperature difference range of the difference between the set temperature and the indoor return air temperature, and adjusting the opening of the fresh air valve according to the comparison result of the evaporator tube temperature and the evaporator tube temperature preset threshold value.

[0040] Specifically, when the fresh air air conditioner does not meet the conditions for opening the fresh air valve, it further determines the temperature difference range of the difference between the set temperature and the indoor return air temperature and the evaporator tube temperature preset threshold or evaporator tube temperature preset range corresponding to the temperature difference range, and then compares the actual evaporator tube temperature with the evaporator tube temperature preset threshold or evaporator tube temperature preset range to adjust the opening of the fresh air valve, thereby improving the accuracy of the valve opening adjustment, facilitating precise control of the amount of fresh air entering the room, ensuring the stability of the indoor temperature and the freshness of the indoor air, and improving the user experience.

[0041] In a preferred embodiment of the present invention, in the preset step, one temperature difference range corresponds to n preset evaporator tube temperature thresholds, n+1 preset evaporator tube temperature ranges, and n+1 preset fresh air valve openings. Each preset evaporator tube temperature range corresponds to a preset fresh air valve opening. By comparing the evaporator tube temperature with the multiple preset evaporator tube temperature ranges, the preset evaporator tube temperature range within which the evaporator tube temperature falls is determined, and the appropriate preset fresh air valve opening is selected, thereby improving the accuracy of adjusting the fresh air valve opening.

[0042] In a preferred embodiment of the present invention, when the difference between the set temperature and the indoor return air temperature is within a specified temperature difference range, the evaporator tube temperature threshold increases and the preset opening of the fresh air valve increases. Specifically, in heating mode, when TS-T1 is a fixed value, the higher the evaporator tube temperature, the better the heating effect at this time. In order to maintain the stability of the indoor temperature, a larger amount of fresh air is required. Therefore, when the evaporator tube temperature threshold or the evaporator tube temperature preset range increases, the preset opening of the fresh air valve is correspondingly increased, so that the heating capacity of the fresh air air conditioner matches the fresh air volume. In cooling mode, the lower the evaporator tube temperature, the better the cooling capacity. In order to maintain the stability of the indoor temperature, a larger amount of fresh air is required. Therefore, when the evaporator tube temperature threshold or the evaporator tube temperature preset range increases, the preset opening of the fresh air valve is correspondingly increased, so that the cooling capacity of the fresh air air conditioner matches the fresh air volume, thereby ensuring the stability of the indoor temperature.

[0043] In a preferred embodiment of the present invention, in the preset step, the preset evaporator tube temperature threshold changes accordingly when the difference between the set temperature and the indoor return air temperature changes. Adaptively changing the preset evaporator tube temperature threshold based on the difference between the set temperature and the indoor return air temperature can prevent the difference from continuously failing to meet the matching preset evaporator tube temperature range, which could lead to an unreasonable preset opening of the fresh air valve and an inability to accurately adjust the fresh air volume, thereby improving the accuracy of fresh air volume adjustment.

[0044] In a preferred embodiment of the present invention, in the preset step, if the fresh air air conditioner is in heating mode, the evaporator tube temperature preset threshold is increased when the difference between the set temperature and the indoor return air temperature increases; and the evaporator tube temperature preset threshold is decreased when the difference between the set temperature and the indoor return air temperature decreases. Specifically, in heating mode, when the difference between the set temperature and the indoor return air temperature increases, indicating poor heating capacity, the evaporator tube temperature takes a long time to reach the set temperature. By increasing the evaporator tube temperature preset threshold, the evaporator tube temperature can be prevented from reaching the original corresponding evaporator tube temperature preset threshold range. This can then reduce the opening of the fresh air valve to a lower level, reducing the amount of fresh air introduced, allowing the indoor return air temperature to reach the set value more quickly, and improving the heating effect. Similarly, when the difference between the set temperature and the indoor return air temperature decreases, indicating acceptable heating capacity, the evaporator tube temperature can rise to the set temperature more quickly. Reducing the evaporator tube temperature preset threshold can increase the opening of the fresh air valve to a higher level, thereby increasing the amount of fresh air, preventing the evaporator tube temperature from increasing too quickly, and maintaining a stable indoor temperature.

[0045] In a preferred embodiment of the present invention, in the preset step, if the fresh air air conditioner is in cooling mode, when the difference between the set temperature and the indoor return air temperature increases, the evaporator tube temperature preset threshold is decreased; when the difference between the set temperature and the indoor return air temperature decreases, the evaporator tube temperature preset threshold is increased. Specifically, in cooling mode, when the difference between the set temperature and the indoor return air temperature increases, i.e., the cooling capacity is poor, the evaporator tube temperature takes a long time to reach the set temperature. By reducing the evaporator tube temperature preset threshold, the evaporator tube temperature can be prevented from reaching the originally corresponding higher evaporator tube temperature preset threshold range, thereby reducing the opening of the fresh air valve to a lower opening, reducing the amount of fresh air introduced, and allowing the indoor return air temperature to reach the set value more quickly, thereby improving the cooling effect. Similarly, when the difference between the set temperature and the indoor return air temperature decreases, it indicates that the cooling capacity is still acceptable, and the evaporator tube temperature can be quickly reduced to the set temperature. Reducing the preset threshold of the evaporator tube temperature can increase the opening of the fresh air valve to a higher level, thereby increasing the fresh air volume, avoiding the evaporator tube temperature from dropping too quickly and the indoor temperature from being too low, which is conducive to maintaining the stability of the indoor temperature.

[0046] The above specifically describes the control method of the fresh air valve of the fresh air air conditioner according to the embodiment of the present invention. The following describes the control method of the fresh air valve of the fresh air air conditioner using a specific embodiment in the heating mode.

[0047] There are four preset evaporator tube temperature thresholds, corresponding to five preset evaporator tube temperature ranges and five preset fresh air valve openings, as shown in the table below. Different temperature ranges require different evaporator tube temperature thresholds. The openings of the same gear under different temperature differences can be set to the same or different depending on the actual situation (e.g., A1 and B1 are the same, A2 and B2 are the same, ... A5 and B5 are the same). This embodiment does not impose any restrictions on this. In cooling mode, the changes in the preset evaporator tube temperature thresholds and the preset fresh air valve opening are as described above and will not be repeated here.

[0048]

[0049]

[0050] Definition: The set temperature is TS, the outdoor fresh air temperature is T0, the indoor return air temperature is T1, and the evaporator tube temperature is T2.

[0051] like Figure 3 As shown, when the air conditioner is operating in heating mode and detects T0 ≥ T1, the fresh air valve is adjusted to the maximum opening to bring in as much fresh air as possible. Note: The temperature rises at T0 and T1 are detected in real time.

[0052] When the air conditioner is running in heating mode and detects that T0 < T1, the fresh air volume is intelligently and accurately controlled based on the indoor return air temperature T1, the set temperature TS and the evaporator tube temperature T2, thereby stabilizing the indoor temperature. The details are as follows:

[0053] The air conditioner operates in heating mode, TS>T1, and TS-T1>a. Assume that TS-T1 is a fixed value a, and a is equal to 10 degrees Celsius.

[0054] Assuming the fresh air valve has five preset openings (A1 = 0, A2 = 25%, A3 = 50%, A4 = 75%, A5 = 100%), we can select four evaporator tube temperature preset thresholds to match them. The four evaporator tube temperature preset thresholds are defined as T21, T22, T23, and T24, where T21 < T22 < T23 < T24. These four evaporator tube temperature preset thresholds can be derived from experimental data or theoretical inference. The correspondence between the intervals formed by these four evaporator tube temperature preset thresholds and the five combinations of fresh air valve openings is as follows:

[0055] When the fresh air air conditioner is operating in heating mode and TS>T1, if the detected evaporator tube temperature T2≥T24, it indicates that the evaporator tube temperature T2 is very high and the heating effect is very good. At this time, the air conditioner main control sends a signal to the stepper motor or linear motor that controls the opening of the fresh air valve to adjust the opening of the fresh air valve to the maximum, that is, fully open.

[0056] When the fresh air air conditioner is operating in heating mode and TS>T1, if the detected evaporator tube temperature T2 is between [T23, T24), it indicates that the evaporator tube temperature T2 is relatively high and the heating effect is better. At this time, the air conditioner main control sends a signal to the stepper motor or linear motor that controls the opening of the fresh air valve to adjust the opening of the fresh air valve to 75%.

[0057] When the fresh air air conditioner is operating in heating mode and TS>T1, if the detected evaporator tube temperature T2 is between [T22, T23), it indicates that the evaporator tube temperature T2 is high and the heating effect is good. At this time, the air conditioner main control sends a signal to the stepper motor or linear motor that controls the opening of the fresh air valve to adjust the opening of the fresh air valve to 50%.

[0058] When the fresh air air conditioner is operating in heating mode and TS>T1, if the detected evaporator tube temperature T2 is between [T21, T22), it indicates that the evaporator tube temperature T2 is generally high and the heating effect is average. At this time, the air conditioner main control sends a signal to the stepper motor or linear motor that controls the opening of the fresh air valve to adjust the opening of the fresh air valve to 25%.

[0059] When the fresh air air conditioner is operating in heating mode and TS>T1, if the detected evaporator tube temperature T2<T21, it indicates that the evaporator tube temperature T2 is low and the heating effect is not very good. At this time, the air conditioner main control sends a signal to the stepper motor or linear motor that controls the opening of the fresh air valve to open the opening of the fresh air valve to 0, that is, to close the fresh air outlet.

[0060] It should be noted that in addition to the above five levels, the preset opening of the fresh air valve can also be subdivided into 10% or 5% adjustment accuracy. The corresponding evaporator tube temperature range will also be divided into finer levels and matched with it. The principle is the same as above and will not be repeated here.

[0061] If TS-T1>a is not established, further determine whether a≤TS-T1<b is established. If so, adjust the opening of the fresh air valve accordingly according to the range of the evaporator tube temperature T2.

[0062] If the air conditioner is operating in cooling mode, similar control logic can be used for heating. The fresh air volume can be intelligently and accurately controlled according to the indoor return air temperature T1, the set temperature TS and the evaporator tube temperature T2, so as to stabilize the indoor temperature. This will not be elaborated here.

[0063] Furthermore, in order to prevent the fresh air valve from being closed for a long time or opened to a small degree, affecting the air quality in the room, such as Figure 4 As shown, the control method of the fresh air valve of the fresh air air conditioner further includes: after adjusting the opening of the fresh air valve, detecting the opening of the fresh air valve in real time and recording it as a, and determining the duration of time when the opening of the fresh air valve is 0, if the opening of the fresh air valve is 0 and the duration exceeds nh (e.g., n=2), controlling the opening of the fresh air valve to increase to the maximum, and after the duration exceeds ms (e.g., 180s), restoring the opening of the fresh air valve to the opening a before adjustment;

[0064] If the opening of the fresh air valve is not 0, further, the duration of the fresh air valve opening at 25% is determined. If the fresh air valve opening is 0 and the duration exceeds nh (e.g., n=2), the fresh air valve opening is increased to 75%. After the duration exceeds ms (e.g., 180s), the fresh air valve opening is restored to the opening a before adjustment. It should be noted that the above openings and durations of opening are only examples and can be adjusted by technicians based on actual conditions.

[0065] like Figure 5 As shown, corresponding to the embodiment of the present invention, the present invention further provides a control device for a fresh air valve of a fresh air air conditioner, and a control method for the fresh air valve of the fresh air air conditioner.

[0066] Specifically, the control device of the fresh air valve of the fresh air air conditioner includes:

[0067] A preset module 21, which presets the evaporator tube temperature preset range and the corresponding fresh air valve preset opening when the difference between the set temperature and the indoor return air temperature is in different temperature difference ranges;

[0068] Detection module 22, real-time detection of outdoor fresh air temperature, indoor return air temperature and evaporator pipe temperature;

[0069] The comparison module 23 is in communication with the detection module 22, and the comparison module 23 compares the outdoor fresh air temperature and the indoor return air temperature;

[0070] The first judgment module 24 judges the operation mode of the fresh air air conditioner and judges whether the fresh air air conditioner meets the fresh air valve opening condition according to the operation mode and the comparison result of the comparison step;

[0071] The second judgment module 25 is in communication with the first judgment module 24 and the detection module 22. If the fresh air air conditioner does not meet the fresh air valve opening condition, the second judgment module 25 determines the temperature difference range of the difference between the set temperature and the indoor return air temperature and the evaporator tube temperature preset range;

[0072] The control module 26 is communicatively connected with the first judgment module 24, the second judgment module 25 and the fresh air valve. The control module 26 adjusts the opening of the fresh air valve according to the judgment result of the first judgment step or adjusts the opening of the fresh air valve according to the judgment result of the second judgment step combined with the preset relationship in the preset step.

[0073] The conditions for opening the fresh air valve are: in heating mode, the outdoor fresh air temperature is higher than the indoor temperature; in cooling mode, the outdoor fresh air temperature is lower than the indoor return air temperature.

[0074] The present invention further provides a fresh air air conditioner, comprising a control device for the fresh air valve of the fresh air air conditioner.

[0075] The present invention further provides a computer-readable storage medium storing a computer program, which implements the above-mentioned method for controlling the fresh air valve of the fresh air air conditioner when the computer program is executed by a processor.

[0076] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling a fresh air valve of a fresh air air conditioner, characterized in that: The following steps are involved: Presetting step: when the difference between the set temperature and the indoor return air temperature is within different temperature difference ranges, the corresponding evaporator tube temperature preset ranges and the corresponding fresh air valve preset openings are respectively set, one temperature difference range corresponds to n evaporator tube temperature preset thresholds, n+1 evaporator tube temperature preset ranges and n+1 fresh air valve preset openings, and when the difference between the set temperature and the indoor return air temperature changes, the evaporator tube temperature preset thresholds change accordingly; Detection step: real-time detection of outdoor fresh air temperature, indoor return air temperature and evaporator pipe temperature; Comparison step: comparing the outdoor fresh air temperature and the indoor return air temperature; The first judgment step: judging the operation mode of the fresh air air conditioner, and judging whether the fresh air air conditioner meets the fresh air valve opening condition according to the operation mode and the comparison result of the comparison step; The second judgment step: if the fresh air air conditioner does not meet the fresh air valve opening condition, judging the temperature difference range within which the difference between the set temperature and the indoor return air temperature lies and the evaporator tube temperature preset range within which the evaporator tube temperature lies; Control step: adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step combined with the preset relationship in the preset step.

2. The method for controlling the fresh air valve of the fresh air air conditioner according to claim 1, characterized in that: In the control step, adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step in combination with the preset relationship in the preset step includes: In the heating mode, if the outdoor fresh air temperature is higher than the indoor return air temperature and the fresh air air conditioner meets the fresh air valve opening condition, the opening of the fresh air valve is increased; In the cooling mode, if the outdoor fresh air temperature is lower than the indoor return air temperature and the fresh air air conditioner meets the fresh air valve opening condition, the opening of the fresh air valve is increased.

3. The method for controlling the fresh air valve of a fresh air air conditioner according to claim 1, characterized in that: In the control step, adjusting the opening of the fresh air valve according to the judgment result of the first judgment step or adjusting the opening of the fresh air valve according to the judgment result of the second judgment step in combination with the preset relationship in the preset step includes: According to the temperature difference range of the difference between the set temperature and the indoor return air temperature, the corresponding evaporator tube temperature preset range is selected, and the opening of the fresh air valve is adjusted according to the comparison result of the evaporator tube temperature and the evaporator tube temperature preset range.

4. The method for controlling the fresh air valve of the fresh air air conditioner according to claim 3, characterized in that: When the difference between the set temperature and the indoor return air temperature is within a specified temperature difference range, the evaporator tube temperature threshold increases and the preset opening of the fresh air valve increases.

5. The method for controlling the fresh air valve of the fresh air air conditioner according to claim 4, characterized in that: In the preset step, if the fresh air air conditioner is in heating mode, when the difference between the set temperature and the indoor return air temperature increases, the evaporator tube temperature preset threshold increases; when the difference between the set temperature and the indoor return air temperature decreases, the evaporator tube temperature preset threshold decreases.

6. The method for controlling the fresh air valve of the fresh air air conditioner according to claim 5, characterized in that: In the preset step, if the fresh air air conditioner is in cooling mode, when the difference between the set temperature and the indoor return air temperature increases, the evaporator tube temperature preset threshold decreases; when the difference between the set temperature and the indoor return air temperature decreases, the evaporator tube temperature preset threshold increases.

7. A control device for a fresh air valve of a fresh air air conditioner, characterized in that: A method for controlling the fresh air valve of a fresh air air conditioner according to any one of claims 1 to 6.

8. A fresh air air conditioner, characterized in that: A control device for the fresh air valve of the fresh air air conditioner comprising the control device of claim 7.

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