Control method of air conditioning equipment and air conditioning equipment

Abstract

The invention relates to the technical field of air conditioning equipment, in particular to an air conditioning equipment control method and air conditioning equipment, and aims to solve the technical problems that an existing air conditioning equipment control method is poor in expansion valve control precision and cannot effectively adapt to different operation working conditions of the air conditioning equipment, so that the air conditioning equipment is shut down abnormally, and noise is increased. Therefore, the air conditioning equipment comprises a compressor, an outdoor heat exchanger, an electronic expansion valve and an indoor heat exchanger which are sequentially connected in series, and the control method comprises the steps that after the air conditioning equipment is started, the outdoor temperature is obtained; according to the outdoor temperature, the initial opening degree of the corresponding electronic expansion valve is obtained; and the opening degree of the electronic expansion valve is adjusted to the initial opening degree. Through the arrangement, the initial opening degree and the subsequent adjustment amount of the expansion valve can be corrected according to the outdoor temperature so as to adapt to different limiting working conditions of the air conditioning equipment, the control precision and speed of the expansion valve are improved, abnormal shutdown of the air conditioning equipment is prevented, and the operation noise of the air conditioning equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning equipment, and specifically provides a control method and an air conditioning equipment for air conditioning equipment. Background Art

[0002] The expansion valve is an important refrigeration component on the air conditioning equipment. Its main function is to control the superheat of the gaseous refrigerant at the outlet of the evaporator, and then control the refrigerant flow rate entering the evaporator. According to different balancing methods, the expansion valve can be divided into two types: externally balanced and internally balanced. In some special air conditioning systems, due to the evaporator having multiple branches and passing through a shower head distributor, the pressure drop is large, resulting in a large temperature difference between the inlet and outlet of the evaporator.

[0003] Currently, the control of the outdoor unit and the expansion valve of the air conditioner is mostly segmented frequency control. That is, first, the operating frequency of the air conditioner is determined by detecting the ambient temperature, then the rotational speed of the outdoor unit is determined by the ambient temperature and the operating frequency, and at the same time, the opening degree of the expansion valve is determined according to the operating frequency of the outdoor unit, so that each temperature segment only corresponds to a fixed frequency value and a fixed expansion valve opening degree.

[0004] However, the existing control method of the air conditioning equipment has poor control accuracy for the expansion valve, cannot effectively adapt to different operating conditions of the air conditioning equipment, and is prone to technical problems such as abnormal shutdown and increased noise of the air conditioning equipment.

[0005] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Invention

[0006] The present invention aims to solve the above technical problems, that is, the existing control method of the air conditioning equipment has poor control accuracy for the expansion valve, cannot effectively adapt to different operating conditions of the air conditioning equipment, resulting in technical problems such as abnormal shutdown and increased noise of the air conditioning equipment.

[0007] In a first aspect, the present invention provides a control method for an air conditioning equipment. The air conditioning equipment includes a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger connected in series in sequence. The control method includes: after the air conditioning equipment is powered on, obtaining the outdoor temperature; obtaining the initial opening degree of the corresponding electronic expansion valve according to the outdoor temperature; adjusting the opening degree of the electronic expansion valve to the initial opening degree.

[0008] In a preferred technical solution of the above control method, the specific steps of "obtaining the initial opening degree of the corresponding electronic expansion valve according to the outdoor temperature" include: obtaining the target operating frequency of the corresponding compressor according to the outdoor temperature; obtaining the initial opening degree according to the target operating frequency and the outdoor temperature.

[0009] In the preferred technical solution of the above control method, the specific steps of "obtaining the target operating frequency of the compressor corresponding to the outdoor temperature" include: obtaining the theoretical operating frequency of the compressor according to the outdoor temperature; and correcting the theoretical operating frequency according to the outdoor temperature to obtain the target operating frequency.

[0010] In the preferred technical solution of the above control method, the control method further includes: obtaining the coil temperature of the outdoor heat exchanger; calculating the difference between the coil temperature and the outdoor temperature, denoted as the first difference; and selectively increasing the rotational speed of the outdoor fan of the air conditioning device according to the first difference.

[0011] In the preferred technical solution of the above control method, the specific steps of "selectively increasing the rotational speed of the outdoor fan of the air conditioning device according to the first difference" include: comparing the first difference with a first preset value; and selectively increasing the rotational speed of the outdoor fan according to the comparison result.

[0012] In the preferred technical solution of the above control method, the specific steps of "selectively increasing the rotational speed of the outdoor fan according to the comparison result" include: if the first difference is greater than the first preset value, increasing the rotational speed of the outdoor fan; if the first difference is not greater than the first preset value, not increasing the rotational speed of the outdoor fan.

[0013] In the preferred technical solution of the above control method, after the step of "adjusting the opening degree of the electronic expansion valve to the initial opening degree", the control method further includes: obtaining the exhaust temperature of the compressor twice successively within a preset time, denoted as the first exhaust temperature and the second exhaust temperature; obtaining the target exhaust temperature corresponding to the target operating frequency; obtaining the adjustment amount of the electronic expansion valve corresponding to the first exhaust temperature, the second exhaust temperature and the target exhaust temperature; obtaining the target opening degree of the electronic expansion valve corresponding to the initial opening degree and the adjustment amount; and adjusting the opening degree of the electronic expansion valve to the target opening degree.

[0014] In the preferred technical solution of the above control method, after the step of "obtaining the adjustment amount of the electronic expansion valve corresponding thereto", the control method further includes: calculating the difference between the second exhaust temperature and the first exhaust temperature, denoted as the second difference; comparing the second difference with a second preset value; and selectively correcting the adjustment amount according to the comparison result.

[0015] In the preferred technical solution of the above control method, the specific steps of "selectively correcting the adjustment amount according to the comparison result" include: if the second difference is greater than the second preset value, correct the adjustment amount; if the second difference is not greater than the second preset value, do not correct the adjustment amount.

[0016] In a second aspect, the present invention provides an air conditioning device, which includes a controller configured to be able to execute the above control method.

[0017] In the case of adopting the above technical solution, the air conditioning device of the present invention includes a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger connected in series in sequence. The control method of the present invention includes: after the air conditioning device is turned on, obtain the outdoor temperature; according to the outdoor temperature, obtain the initial opening degree of the corresponding electronic expansion valve; adjust the opening degree of the electronic expansion valve to the initial opening degree. Through such a setting, the outdoor temperature is introduced as a control variable to correct the initial opening degree of the electronic expansion valve, improving the accuracy of the initial opening degree, so as to be able to dynamically control the subsequent adjustment amount of the electronic expansion valve through the initial opening degree, improving the control accuracy and response speed of the electronic expansion valve, and further enhancing the adaptability and working efficiency of the air conditioning device under different extreme working conditions, and reducing the operating noise of the air conditioning device.

[0018] Further, the control method of the present invention further includes: obtaining the target operating frequency of the compressor corresponding to the outdoor temperature; obtaining the initial opening degree according to the target operating frequency and the outdoor temperature. Through such a setting, in the process of obtaining the initial opening degree, the target operating frequency of the compressor and the outdoor temperature are jointly used as compensation factors for the initial opening degree, so that the initial opening degree is not only simply associated with the target operating frequency, but also dynamically associated with the outdoor temperature, thereby being able to be corrected according to the change of the outdoor temperature, improving the accuracy and rationality of the initial opening degree.

[0019] Still further, the control method of the present invention further includes: obtaining the theoretical operating frequency of the compressor according to the outdoor temperature; correcting the theoretical operating frequency according to the outdoor temperature to obtain the target operating frequency. Through such a setting, the theoretical operating frequency of the compressor can be dynamically corrected according to the change of the outdoor temperature. Compared with the traditional air conditioning device with a fixed theoretical operating frequency corresponding to each temperature section, this control method makes the corrected target operating frequency more adaptable to the change of the external environment, and can effectively improve the working efficiency and operation stability of the air conditioning device.

[0020] Furthermore, the control method of the present invention further includes: obtaining the coil temperature of the outdoor heat exchanger; calculating the difference between the coil temperature and the outdoor temperature, denoted as the first difference; and selectively increasing the rotational speed of the outdoor fan of the air conditioning device according to the first difference. With such a setting, it is possible to judge the pressure of the outdoor heat exchanger based on the first difference, so as to adjust the speed of the outdoor fan according to the magnitude of the first difference, realize the pressure regulation of the outdoor heat exchanger, and prevent the outdoor unit from abnormal shutdown when the pressure suddenly changes.

[0021] Furthermore, the control method of the present invention further includes: comparing the first difference with a first preset value; and selectively increasing the rotational speed of the outdoor fan according to the comparison result. With such a setting, it is possible to take timely countermeasures when the heat exchange of the outdoor heat exchanger is insufficient and the coil pressure of the outdoor unit suddenly increases, that is, increasing the rotational speed of the outdoor fan, strengthening the heat exchange of the outdoor heat exchanger, reducing the temperature and pressure of the outdoor heat exchanger, and preventing the outdoor unit from abnormal shutdown when the coil pressure suddenly changes.

[0022] Furthermore, the control method of the present invention further includes: if the first difference is greater than the first preset value, increasing the rotational speed of the outdoor fan; if the first difference is not greater than the first preset value, not increasing the rotational speed of the outdoor fan. With such a setting, it is possible to take timely countermeasures when the heat exchange of the outdoor heat exchanger is insufficient and the coil pressure of the outdoor unit suddenly increases, that is, increasing the rotational speed of the outdoor fan, strengthening the heat exchange of the outdoor heat exchanger, reducing the temperature and pressure of the outdoor heat exchanger, and preventing the outdoor unit from abnormal shutdown due to sudden pressure change; when the outdoor unit remains unchanged or changes little, keeping the rotational speed of the outdoor fan unchanged.

[0023] Furthermore, after the step of "adjusting the opening degree of the electronic expansion valve to the initial opening degree", the control method further includes: obtaining the exhaust temperature of the compressor twice successively within a preset time, denoted as the first exhaust temperature and the second exhaust temperature; obtaining the corresponding target exhaust temperature according to the target operating frequency; obtaining the corresponding adjustment amount of the electronic expansion valve according to the first exhaust temperature, the second exhaust temperature and the target exhaust temperature; obtaining the corresponding target opening degree of the electronic expansion valve according to the initial opening degree and the adjustment amount; and adjusting the opening degree of the electronic expansion valve to the target opening degree. With such a setting, first, the target exhaust temperature of the compressor can be obtained, and at the same time, multiple groups of actual exhaust temperatures of the compressor are detected, and the actual exhaust temperature is continuously made to approach the target exhaust temperature to calculate the adjustment amount of the electronic expansion valve, so as to obtain the target opening degree of the electronic expansion valve.

[0024] Furthermore, after the step of "obtaining the adjustment amount of the corresponding electronic expansion valve", the control method further includes: calculating the difference between the second exhaust temperature and the first exhaust temperature, denoted as the second difference; comparing the second difference with a second preset value; and selectively correcting the adjustment amount according to the comparison result. Through such a setting, it is possible to determine whether the temperature rise rate at the compressor exhaust port is abnormal based on the first difference, so as to correct the adjustment amount of the electronic expansion valve according to the temperature rise rate.

[0025] Furthermore, the control method of the present invention further includes: if the second difference is greater than the second preset value, correcting the adjustment amount; if the second difference is not greater than the second preset value, not correcting the adjustment amount. Through such a setting, it is possible to timely correct the adjustment amount of the electronic expansion valve when the exhaust port of the compressor has an abnormal temperature rise, relieve the overall machine pressure, reduce the shutdown risk, and improve the working efficiency and operation stability of the compressor.

[0026] In addition, the air conditioning equipment further provided by the present invention on the basis of the above technical solution has the technical effects possessed by the above control method. Compared with the air conditioning equipment before improvement, the air conditioning equipment of the present invention improves the control accuracy of the expansion valve by detecting the outdoor temperature in real time and dynamically controlling the operating frequency and expansion valve opening of the outdoor unit of the air conditioner according to the detected outdoor temperature in real time. Furthermore, it can more effectively adapt to different operating conditions of the air conditioning equipment, avoid abnormal shutdown of the air conditioning equipment, and suppress operating noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, in which:

[0028] Figure 1 is a schematic structural diagram of the air conditioning equipment of the present invention;

[0029] Figure 2 is a flowchart of the control method of the air conditioning equipment of the present invention;

[0030] Figure 3 is a flowchart of the first embodiment of the control method of the air conditioning equipment of the present invention;

[0031] Figure 4 is a flowchart of the second embodiment of the control method of the air conditioning equipment of the present invention;

[0032] Figure 5 is a flowchart of the third embodiment of the control method of the air conditioning equipment of the present invention.

[0033] List of reference signs:

[0034] 1. Compressor; 2. Outdoor heat exchanger; 3. Electronic expansion valve; 4. Indoor heat exchanger. Detailed implementation manners

[0035] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0036] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "inside", "outside", "above", "below", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0037] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "arranged", "connected", "installed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Based on the technical problem pointed out in the background art that the existing control method of air-conditioning equipment has poor control accuracy for the expansion valve, cannot effectively adapt to different operating conditions of the air-conditioning equipment, and is prone to abnormal shutdown and increased noise of the air-conditioning equipment. For this reason, the present invention provides a control method and an air-conditioning equipment for an air-conditioning equipment, aiming to correct the initial opening degree of the electronic expansion valve by introducing the outdoor temperature as a variable, so as to improve the control accuracy of the initial opening degree, so as to be able to dynamically control the subsequent adjustment amount of the electronic expansion valve through the initial opening degree, improve the control accuracy and response speed of the electronic expansion valve, and further improve the adaptability and working efficiency of the air-conditioning equipment under different extreme conditions, and reduce the operating noise of the air-conditioning equipment.

[0039] Specifically, as Figure 1 and Figure 2 shown, the air-conditioning equipment of the present invention includes a compressor 1, an outdoor heat exchanger 2, an electronic expansion valve 3, and an indoor heat exchanger 4 connected in series in sequence. The control method of the present invention includes:

[0040] S100: After the air-conditioning equipment is started, obtain the outdoor temperature;

[0041] S200: According to the outdoor temperature, obtain the corresponding initial opening degree of the electronic expansion valve;

[0042] S300: Adjust the opening degree of the electronic expansion valve to the initial opening degree.

[0043] During the operation of the air conditioner, the outdoor temperature is an important parameter in the control of the outdoor unit. It not only directly affects the operating frequency of the variable-frequency air conditioner and the rotational speed of the outdoor fan, but also has a significant impact on the overall pressure of the system. At the same time, the operating frequency affects the opening control of the electronic expansion valve 3. In the present invention, after the air-conditioning equipment is turned on, the control system first obtains an initial opening of the electronic expansion valve 3 according to the outdoor temperature, and then adjusts the opening of the electronic expansion valve 3 to the initial opening. Next, on the basis of the initial opening, the subsequent opening of the electronic expansion valve 3 is adjusted according to changes in environmental factors such as the outdoor temperature, thereby improving the temperature adjustment efficiency.

[0044] Exemplarily, the control method of the present invention is directed to air-conditioning equipment with variable-frequency capabilities, outdoor ambient temperature detection capabilities, and system pressure detection capabilities. The outdoor temperature is introduced as a control variable to correct the initial opening of the electronic expansion valve 3, improving the control accuracy of the initial opening, so as to dynamically control the subsequent adjustment amount of the electronic expansion valve 3 according to the initial opening, improving the control accuracy and response speed of the electronic expansion valve 3, and further enhancing the adaptability of the air-conditioning equipment to different extreme working conditions, reducing the operating noise of the air-conditioning equipment, and ensuring the working efficiency and operating stability.

[0045] Preferably, as Figure 1 and Figure 3 shown, the specific steps of "obtaining the initial opening of the corresponding electronic expansion valve according to the outdoor temperature" include:

[0046] S210: Obtain the target operating frequency of the compressor according to the outdoor temperature;

[0047] S220: Obtain the initial opening according to the target operating frequency and the outdoor temperature.

[0048] Exemplarily, the initial opening of the electronic expansion valve 3 is associated with the operating frequency of the compressor 1. Specifically, the initial opening is obtained by substituting the operating frequency into a certain algorithm for calculation. Therefore, to improve the accuracy of the initial opening, it is first necessary to ensure the accuracy of the operating frequency. The control method of the present invention optimizes the method of obtaining the operating frequency to obtain the most ideal operating frequency of the compressor 1, that is, the target operating frequency.

[0049] In the process of obtaining the initial opening of the control method of the present invention, the target operating frequency of the compressor 1 and the outdoor temperature are jointly used as compensation factors for the initial opening, so that the initial opening is not only simply associated with the target operating frequency, but also dynamically associated with the outdoor temperature. By improving the accuracy of the target operating frequency and combining the introduction of the outdoor temperature, the control system can correct it according to the change of the outdoor temperature, thereby improving the accuracy and rationality of the initial opening.

[0050] Preferably, as Figure 1 and Figure 3 shown, the specific steps of "obtaining the target operating frequency of the corresponding compressor according to the outdoor temperature" include:

[0051] S211: Obtain the theoretical operating frequency of the compressor according to the outdoor temperature;

[0052] S212: Modify the theoretical operating frequency according to the outdoor temperature to obtain the target operating frequency.

[0053] Exemplarily, compared with the traditional control method, after obtaining the theoretical operating frequency of the compressor 1 according to the outdoor temperature, the control method of the present invention will also modify the theoretical operating frequency according to the change of the outdoor temperature, and the target operating frequency is obtained after the theoretical operating frequency is modified.

[0054] Compared with the traditional air-conditioning equipment, there is only one fixed theoretical operating frequency in each temperature section, so that the modified target operating frequency is more reasonable and accurate, and can effectively improve the working efficiency and operation stability of the air-conditioning equipment.

[0055] Exemplarily, in a preferred embodiment of the present invention, the outdoor temperature is denoted as Tao, the theoretical operating frequency is denoted as f max, the target operating frequency is denoted as f, the initial opening is denoted as V0, and the frequency coefficient a, the ambient temperature coefficient b, and the outdoor temperature compensation coefficient c are introduced. After starting up, first obtain the theoretical operating frequency f max through the operation comparison table of the theoretical operating frequency and the outdoor temperature, and then judge whether the air-conditioning equipment is in the cooling mode or the heating mode at this time. If it is determined that the air-conditioning equipment is in the cooling mode, the formula c = 1 - |Tao - 35| / 35 is executed to calculate the outdoor temperature compensation coefficient. If it is determined that the air-conditioning equipment is in the heating mode, the formula c = 1 - (Tao - 2) / 45 is executed to calculate the outdoor temperature compensation coefficient.

[0056] After obtaining the outdoor temperature compensation coefficient c, the system substitutes c into the formula f = c * f max to obtain the target operating frequency f, so as to modify the theoretical operating frequency f max. It should be noted that when c > 1, the system defaults the value of c to 1.

[0057] After obtaining the target operating frequency f, the system then substitutes f into the formula V0 = a * f + b * (Tao - 25), and further determines the initial opening of the electronic expansion valve 3.

[0058] Preferably, as Figure 1 , Figure 4 and Figure 5 shown, the control method of the present invention further includes:

[0059] S400: Obtain the coil temperature of the outdoor heat exchanger;

[0060] S500: Calculate the difference between the coil temperature and the outdoor temperature, denoted as the first difference;

[0061] S600: Selectively increase the rotational speed of the outdoor fan of the air conditioning equipment according to the first difference.

[0062] Exemplarily, a temperature sensor is provided near the coil of the outdoor heat exchanger 2, which can obtain the temperature near the coil in real time, that is, the coil temperature. During the operation of the air conditioning equipment, the coil temperature gradually rises and tends to be stable. The system will calculate the difference between the coil temperature and the outdoor temperature in real time, denoted as the first difference. The first difference can accurately reflect the heat exchange situation of the outdoor heat exchanger 2 and the pressure of the outdoor heat exchanger 2. By judging whether the pressure of the outdoor heat exchanger 2 is normal, the rotational speed of the outdoor fan is adjusted to control the pressure of the outdoor heat exchanger 2 within the normal range and prevent the outdoor unit from abnormal shutdown due to sudden pressure change.

[0063] Preferably, as Figure 1 and Figure 4 shown, the specific steps of "selectively increasing the rotational speed of the outdoor fan of the air conditioning equipment according to the first difference" include:

[0064] S610: Compare the first difference with the first preset value;

[0065] S620: Selectively increase the rotational speed of the outdoor fan according to the comparison result.

[0066] The first preset value sets a reasonable temperature difference range between the coil temperature and the outdoor temperature, so as to evaluate the first difference and judge whether the first difference is within a reasonable range. The present invention preferably sets the first preset value to 2.

[0067] When the first difference exceeds the reasonable range, that is, the difference between the coil temperature and the outdoor temperature is greater than 2°C, it indicates that the heat exchange of the outdoor heat exchanger 2 is not sufficient at this time, resulting in a sudden increase in the pressure of the outdoor unit. The control system will take timely countermeasures, that is, increase the rotational speed of the outdoor fan to strengthen the heat exchange of the outdoor heat exchanger 2, so as to reduce the temperature and pressure of the outdoor heat exchanger 2 and prevent the sudden increase in the pressure of the outdoor unit from triggering the pressure switch and causing abnormal shutdown.

[0068] Preferably, as Figure 1 and Figure 4 shown, the specific steps of "selectively increasing the rotational speed of the outdoor fan according to the comparison result" include:

[0069] S621: If the first difference is greater than the first preset value, increase the rotational speed of the outdoor fan;

[0070] S622: If the first difference is not greater than the first preset value, do not increase the rotational speed of the outdoor fan.

[0071] When the first difference is greater than the first preset value, it indicates that the refrigerant heat exchange in the outdoor heat exchanger 2 is not sufficient, and there is too much gaseous refrigerant, resulting in a sharp increase in the pressure at the exhaust port of the compressor 1. The control system will increase the rotational speed of the outdoor fan to improve the heat exchange efficiency of the outdoor heat exchanger 2 and prevent the pressure from rising sharply and triggering the pressure switch, resulting in abnormal shutdown of the compressor 1.

[0072] When the first difference is not greater than the first preset value, it indicates that the refrigerant heat exchange in the outdoor heat exchanger 2 is normal, and the pressure at the exhaust port of the compressor 1 is normal. There is no need to increase the rotational speed of the outdoor fan, and the original rotational speed can be maintained.

[0073] Therefore, the control method of the present invention can take timely countermeasures when the pressure of the outdoor unit suddenly rises, resulting in insufficient heat exchange of the outdoor heat exchanger 2, that is, increase the rotational speed of the outdoor fan, strengthen the heat exchange of the outdoor heat exchanger 2, reduce the temperature and pressure of the outdoor heat exchanger 2, and prevent abnormal shutdown caused by sudden pressure change of the outdoor unit; when the outdoor unit remains unchanged or changes little, keep the rotational speed of the outdoor fan unchanged.

[0074] In a preferred embodiment of the present invention, the initial rotational speed of the outdoor fan is denoted as RPM0, and RPM0 = 300 rpm. The coil temperature of the outdoor heat exchanger 2 is denoted as T1. In the initial stage of the operation of the air conditioning equipment, the system will obtain the coil temperature T1 in real time and compare the coil temperature with the outdoor temperature. When the system detects that the difference between the coil temperature and the outdoor temperature is greater than 2°C, that is, |T1 - Tao| > 2, the rotational speed of the outdoor fan will be gradually increased by 30 rpm each time. When |T1 - Tao| ≤ 2, the existing rotational speed will be maintained unchanged.

[0075] It should be noted that the control stage of the initial opening is executed 6 times, each time for 30 s, so that the initial opening reaches stability.

[0076] Preferably, as Figure 1 and Figure 5 shown, after the step of "adjusting the opening of the electronic expansion valve to the initial opening", the control method of the present invention further includes:

[0077] S700: Obtain the exhaust temperature of the compressor twice successively within a preset time, denoted as the first exhaust temperature and the second exhaust temperature;

[0078] S800: Obtain the corresponding target exhaust temperature according to the target operating frequency;

[0079] S900: Obtain the corresponding adjustment amount of the electronic expansion valve according to the first exhaust temperature, the second exhaust temperature and the target exhaust temperature;

[0080] S1000: Obtain the target opening degree of the corresponding electronic expansion valve according to the initial opening degree and the adjustment amount;

[0081] S1100: Adjust the opening degree of the electronic expansion valve to the target opening degree.

[0082] After the initial opening degree tends to be stable, the system will enter the PID control stage. The PID control stage fine-tunes the initial opening degree according to the changes of different parameters based on the initial opening degree. Its core components include the proportional unit P, the integral unit I, and the differential unit D, as well as the corresponding three control parameters Kp, Ki, and Kd. Their relationship is: P = Kp * e (the influence of the current calculated value on the final change value), I = Ki * e0 (the influence of the previous calculated value on the final change value), D = Kd * (e - e0) (the influence of the two change trends on the final change value), where K is any other numerical calculation coefficient, e is the difference between the actual exhaust gas temperature T1 and the target exhaust gas temperature T0 in the current control cycle. The actual exhaust gas temperature T1 can be measured by the temperature sensor installed at the exhaust port of the compressor 1. The target exhaust gas temperature T0 is obtained by substituting the target operating frequency into a certain algorithm for calculation (i.e., e = T1 - T0). Similarly, e0 is the difference between the actual exhaust gas temperature T1 and the target exhaust gas temperature T0 in the previous control cycle. The exhaust gas temperature and them jointly determine the behavior of the controller. By adjusting these parameters, the optimal control of the system output can be achieved in the PID control stage.

[0083] After entering the PID control stage, the system will first obtain the target exhaust gas temperature of the compressor 1 and continuously detect the actual exhaust gas temperature of the compressor 1. Determine the proportional unit P, the integral unit I, and the differential unit D by calculating the difference between the actual exhaust gas temperature and the target exhaust gas temperature in each control cycle, and then calculate the adjustment amount △V of the electronic expansion valve 3 according to the proportional unit P, the integral unit I, and the differential unit D, that is, △V = P + I + D, so that the actual exhaust gas temperature continuously approaches the target exhaust gas temperature, and finally obtain the target opening degree of the electronic expansion valve 3.

[0084] Preferably, as Figure 1 shown, after the step of "obtaining the adjustment amount of the corresponding electronic expansion valve", the control method of the present invention further includes:

[0085] Calculate the difference between the second exhaust gas temperature and the first exhaust gas temperature, denoted as the second difference;

[0086] Compare the second difference with the second preset value;

[0087] Selectively correct the adjustment amount according to the comparison result.

[0088] By the magnitude of the first difference, it can be determined whether the temperature rise rate at the exhaust port of the compressor 1 is abnormal, so as to correct the adjustment amount of the electronic expansion valve 3 according to the abnormal temperature rise rate. In this solution, by analyzing the operation data of the air conditioning equipment, the second preset value is preferably set to 5.

[0089] Preferably, the specific steps of "selectively correcting the adjustment amount according to the comparison result" include:

[0090] If the second difference is greater than the second preset value, correct the adjustment amount;

[0091] If the second difference is not greater than the second preset value, do not correct the adjustment amount.

[0092] When the second difference is greater than the second preset value, it indicates that the difference between the second exhaust temperature and the first exhaust temperature is greater than 5°C, that is, the exhaust temperature of the compressor 1 rises too fast per unit time, and it is necessary to compensate the opening of the electronic expansion valve 3, that is, V = V0 + △V + 0.5*C, where V is the target opening of the electronic expansion valve 3, V0 is the initial opening of the electronic expansion valve 3, △V is the adjustment amount of the electronic expansion valve 3, and C is the compensation coefficient of the adjustment amount, so as to obtain a more ideal target opening.

[0093] In an embodiment of the present invention, in the case where the second difference is greater than the second preset value, if the outdoor temperature is detected, when the outdoor temperature is less than 35°C, C = 0.23*Tao + 2, and when the outdoor temperature is not less than 35°C, C = 1.2*Tao - 32.

[0094] It should be noted that after the electronic expansion valve 3 is adjusted to the target opening, it needs to be maintained for 10 seconds, and then enter the next control cycle after the opening of the electronic expansion valve 3 tends to be stable.

[0095] Through such a setting, when the exhaust port of the compressor 1 has an abnormal temperature rise, the adjustment amount of the electronic expansion valve 3 can be corrected in a timely manner, relieving the pressure of the whole machine, reducing the risk of shutdown, and improving the working efficiency and operation stability of the compressor 1.

[0096] In addition, the air conditioning equipment further provided by the present invention on the basis of the above technical solution has the technical effects of the above control method due to adopting the above control method. Compared with the air conditioning equipment before improvement, the air conditioning equipment of the present invention dynamically controls the operating frequency and expansion valve opening of the outdoor unit of the air conditioner according to the real-time detected outdoor temperature, improves the control accuracy of the expansion valve, and can thus more effectively adapt to different operating conditions of the air conditioning equipment, avoid abnormal shutdown of the air conditioning equipment, and suppress operating noise.

[0097] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. A control method for an air conditioning device, the air conditioning device comprising a compressor, an outdoor heat exchanger, an electronic expansion valve, and an indoor heat exchanger connected in series in sequence, characterized in that, The control method includes: After the air conditioning equipment is turned on, obtain the outdoor temperature; According to the outdoor temperature, obtain the initial opening degree of the corresponding electronic expansion valve; Adjust the opening degree of the electronic expansion valve to the initial opening degree.

2. The control method according to claim 1, wherein The specific steps of "According to the outdoor temperature, obtain the initial opening degree of the corresponding electronic expansion valve" include: According to the outdoor temperature, obtain the target operating frequency of the corresponding compressor; According to the target operating frequency and the outdoor temperature, obtain the initial opening degree.

3. The control method according to claim 2, wherein The specific steps of "According to the outdoor temperature, obtain the target operating frequency of the corresponding compressor" include: According to the outdoor temperature, obtain the theoretical operating frequency of the compressor; Correct the theoretical operating frequency according to the outdoor temperature to obtain the target operating frequency.

4. The control method according to claim 1, characterized in that The control method further includes: Obtain the coil temperature of the outdoor heat exchanger; Calculate the difference between the coil temperature and the outdoor temperature, denoted as the first difference; According to the first difference, selectively increase the rotational speed of the outdoor fan of the air conditioning equipment.

5. The control method according to claim 4, characterized in that, The specific steps of "According to the first difference, selectively increase the rotational speed of the outdoor fan of the air conditioning equipment" include: Compare the first difference with a first preset value; According to the comparison result, selectively increase the rotational speed of the outdoor fan.

6. The control method according to claim 5, wherein The specific steps of "According to the comparison result, selectively increase the rotational speed of the outdoor fan" include: If the first difference is greater than the first preset value, increase the rotational speed of the outdoor fan; If the first difference is not greater than the first preset value, do not increase the rotational speed of the outdoor fan.

7. The control method according to claim 2, characterized in that, After the step of "Adjust the opening degree of the electronic expansion valve to the initial opening degree", the control method further includes: Obtain the exhaust temperature of the compressor twice successively within a preset time, denoted as the first exhaust temperature and the second exhaust temperature; According to the target operating frequency, obtain the corresponding target exhaust temperature; According to the first exhaust temperature, the second exhaust temperature and the target exhaust temperature, obtain the corresponding adjustment amount of the electronic expansion valve; According to the initial opening degree and the adjustment amount, obtain the corresponding target opening degree of the electronic expansion valve; Adjust the opening degree of the electronic expansion valve to the target opening degree.

8. The control method according to claim 7, wherein After the step of "Obtain the corresponding adjustment amount of the electronic expansion valve", the control method further includes: Calculate the difference between the second exhaust temperature and the first exhaust temperature, denoted as the second difference; Compare the second difference with a second preset value; According to the comparison result, selectively correct the adjustment amount.

9. The control method according to claim 8, characterized in that The specific steps of "According to the comparison result, selectively correct the adjustment amount" include: If the second difference is greater than the second preset value, correct the adjustment amount; If the second difference is not greater than the second preset value, do not correct the adjustment amount.

10. An air conditioning device, characterized in that, The air conditioning equipment includes a controller, and the controller is configured to be able to execute the control method according to any one of claims 1 to 9.

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