Control method of electronic expansion valve, controller, air conditioner and storage medium

Abstract

The embodiment of the invention discloses a control method of an electronic expansion valve, a controller, an air conditioner and a storage medium. The current rotating speed of a fan is detected; then, under the condition that the current rotating speed is larger than the preset rotating speed, a reset control identifier of the electronic expansion valve is obtained; and then, when the reset control identifier represents that the reset operation is executed, the electronic expansion valve is reset according to the embodiment of the invention. According to the embodiment of the invention, the electronic expansion valve is reset when the air speed of the fan is greater than the preset rotating speed after the air conditioner is turned on, so that noise generated by resetting of the electronic expansion valve can be covered by wind sound generated by rotation of the fan, and the noise generated by resetting of the electronic expansion valve after the air conditioner is turned off can be avoided; and the influence of noise generated when the electronic expansion valve is reset on a user is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, and in particular to a control method, a controller, an air conditioner and a storage medium for an electronic expansion valve. Background Art

[0002] In the related art, in order to prevent the accumulation of electronic expansion valve out of step and cause control failure, an effective solution is to reset the electronic expansion valve after the air conditioner is turned off. However, since the air conditioner often generates extra noise during the resetting process of the electronic expansion valve, the user experience is affected. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a control method, a controller, an air conditioner and a storage medium for an electronic expansion valve, aiming to reduce the impact of noise generated during the resetting process of the electronic expansion valve on users.

[0004] In a first aspect, an embodiment of the present application provides a method for controlling an electronic expansion valve, comprising the following steps:

[0005] Detect the current speed of the fan;

[0006] When the current speed is greater than the preset speed, a reset control flag of the electronic expansion valve is obtained;

[0007] When the reset control mark indicates that a reset operation is performed, the electronic expansion valve is reset.

[0008] Further, in one embodiment of the present application, after obtaining the reset control flag of the electronic expansion valve, the control method includes the following steps:

[0009] When the reset control flag indicates that the reset operation is not performed, the operating frequency of the compressor is obtained;

[0010] The opening of the electronic expansion valve is adjusted according to the operating frequency.

[0011] Furthermore, in one embodiment of the present application, the control method further includes the following steps:

[0012] When the value of the reset control flag is one, determining that the reset control flag represents the execution of a reset operation;

[0013] When the value of the reset control flag is zero, it is determined that the reset control flag indicates that the reset operation is not performed.

[0014] Further, in one embodiment of the present application, after resetting the electronic expansion valve, the control method further includes the following steps:

[0015] Get the target initial opening;

[0016] Adjust the opening of the electronic expansion valve to the target initial opening;

[0017] The reset control flag is adjusted so that the reset control flag is used to indicate that the reset operation is not performed.

[0018] Furthermore, in one embodiment of the present application, after detecting the current speed of the fan, the control method further includes:

[0019] When the current speed is less than or equal to the preset speed, the target initial opening is obtained;

[0020] Adjust the opening of the electronic expansion valve to the target initial opening.

[0021] Further, in one embodiment of the present application, after resetting the electronic expansion valve, the control method further includes the following steps:

[0022] Count the working hours of the electronic expansion valve;

[0023] When the working time is greater than or equal to the preset time, the reset control flag is adjusted so that the reset control flag is used to indicate the execution of the reset operation.

[0024] Furthermore, in one embodiment of the present application, adjusting the reset control flag further includes the following steps:

[0025] Adjust the value of the reset control flag to one.

[0026] In a second aspect, an embodiment of the present application provides a controller comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method of the electronic expansion valve as described in the first aspect above when running the computer program.

[0027] In a third aspect, an embodiment of the present application provides an air conditioner, comprising a controller as described in the second aspect above.

[0028] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to execute the control method of the electronic expansion valve as described in the first aspect above.

[0029] According to the technical solution of the embodiment of the present application, at least the following beneficial effects are achieved: first, the embodiment of the present application detects the current speed of the fan; then, when the current speed is greater than the preset speed, the embodiment of the present application obtains the reset control mark of the electronic expansion valve; then, when the reset control mark indicates that a reset operation is to be performed, the embodiment of the present application resets the electronic expansion valve. Since the embodiment of the present application resets the electronic expansion valve when the fan speed is greater than the preset speed after the air conditioner is turned on, the wind sound generated by the rotation of the fan can be used to cover the noisy sound of the electronic expansion valve resetting, thereby avoiding the noisy sound of the electronic expansion valve resetting after the air conditioner is turned off, and reducing the impact of the noise during the electronic expansion valve resetting on the user.

[0030] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0032] Figure 1 is a flow chart of a method for controlling an electronic expansion valve provided by an embodiment of the present application;

[0033] Figure 2 is a flow chart of a method for controlling an electronic expansion valve provided by another embodiment of the present application;

[0034] Figure 3 is a flow chart of a method for controlling an electronic expansion valve provided by another embodiment of the present application;

[0035] Figure 4 is a flow chart of a method for controlling an electronic expansion valve provided by another embodiment of the present application;

[0036] Figure 5 is a flow chart of a method for controlling an electronic expansion valve provided by another embodiment of the present application;

[0037] Figure 6 is a flow chart of a method for controlling an electronic expansion valve provided by another embodiment of the present application;

[0038] Figure 7 It is an overall flow chart of a control method of an electronic expansion valve provided by an embodiment of the present application;

[0039] Figure 8 It is a schematic diagram of a controller for executing a control method of an electronic expansion valve provided in one embodiment of the present application. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0041] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0043] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0044] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0045] The electronic expansion valve is a device that uses electrical signals to control the refrigerant flow. It is mainly composed of a drive module, an electrical interface, a motor actuator, and a simple adjustment part. In the refrigeration system, it is installed between the evaporator outlet and the capillary tube, playing an important role in diffusing the refrigerant, controlling the refrigerant flow, achieving variable temperature heat exchange, and maintaining system pressure. It detects the inlet and outlet pressure difference of the evaporator, calculates and controls the outlet pressure, thereby achieving the purpose of controlling the refrigerant flow. When the set pressure difference is reached, the electronic control valve will drive the motor to rotate the clamp chip continuously, change the cross-sectional area of ​​the flow channel, and adjust the refrigerant flow.

[0046] The opening of the electronic expansion valve (Opening of EXV) refers to the parameter that controls the opening degree or opening state of the expansion valve. The commonly used opening range of the electronic expansion valve is usually 0 to 500 steps. These steps are a digital signal used to control the opening degree of the expansion valve. For example, an opening of 0 steps means it is completely closed, and 500 steps means it is fully open. By adjusting the opening of the electronic expansion valve, the flow and pressure of the refrigerant can be adjusted to achieve the desired cooling effect. The control of the electronic expansion valve can be achieved through electronic controllers, sensors and other equipment. According to the control logic and requirements of the system, by changing the opening of the expansion valve, the system can achieve the best cooling effect under different working conditions.

[0047] Out-Of-Step of an electronic expansion valve refers to the phenomenon that the actual valve opening is inconsistent with the set opening due to some reasons during the control process of the electronic expansion valve in the refrigeration or air-conditioning system. Out-of-step is usually caused by the following problems: Mechanical problems: The mechanical components inside the expansion valve cannot open or close accurately due to fatigue, looseness or other failures, affecting the valve opening control. Control problems: Signal transmission, processing or calculation problems in the control system cause cams, delays, etc., resulting in the control signal being unable to be accurately connected to the expansion valve, thereby causing the opening to be repaired. Environmental factors: During the operation of the refrigeration or air-conditioning system, changes and influences of factors such as ambient temperature and humidity may cause deviations in the opening of the expansion valve. The existence of out-of-step problems will cause the system's refrigeration effect to freeze, humidity to increase, or fail to meet design requirements.

[0048] In some cases, resetting the electronic expansion valve is an effective way to prevent the accumulation of out-of-step and control failure in actual operation. When the electronic expansion valve is closed and fully opened, in order to avoid the position of the valve being uncertain due to out-of-step, an interference pulse is generally applied to the valve in the control logic to ensure that the electronic expansion valve is in a state of 0% or 100%, and then the specific opening control is performed. This process will occur when the unit is initialized or the electronic expansion valve is initialized.

[0049] The rotor of the electronic expansion valve is connected to the valve stem and the valve needle. Through the coil excitation, the rotor rotates and drives the valve stem to move up and down to adjust the flow. In order to prevent the valve stem from rotating beyond the range, there are upper and lower limit springs inside. In the actual process, when the valve is closed to 0% or opened to 100%, the solenoid valve will apply an interference pulse to ensure that the electronic expansion valve is completely closed or fully opened. When the solenoid valve applies an interference pulse, the valve stem will squeeze the limit spring to deform it. When the pulse ends, the valve stem will reset under the action of the spring force. In this process, a "clicking" spring sound will be generated. At the same time, the piston will also produce some clicking sounds or slight mechanical collision sounds when it moves or pushes to the reset position, and the components in the electronic expansion valve control circuit will also make sounds, such as the charging and discharging sounds of relays or capacitors.

[0050] In addition, the valve stem of the electronic expansion valve is fixed by two upper and lower positioning springs. Under the excitation of the coil, the rotation of the rotor drives the rotation of the valve stem, thereby adjusting the flow rate. In actual use, it is found that when the valve is about to close, the gas medium sends friction during the throttling process in the valve, and the resistance and airflow disturbance are greatly increased, so eddies in different directions are generated. When the excitation frequency of the eddy current is coupled with the natural frequency of the mechanical element, or with the longitudinal air column acoustic standing wave in the pipeline, the transverse air column oscillation, thermal dynamic shock, pneumatic dynamic shock, pneumatic dynamic compression or other unstable flow to produce pressure waves, resonance will occur and pneumatic noise will be emitted.

[0051] Based on the above situation, the embodiment of the present application proposes a control method, controller, air conditioner and storage medium for an electronic expansion valve, which detects the current speed of the fan; then, when the current speed is greater than the preset speed, the embodiment of the present application will obtain the reset control mark of the electronic expansion valve; then, when the reset control mark indicates the execution of the reset operation, the embodiment of the present application will reset the electronic expansion valve. Since the embodiment of the present application resets the electronic expansion valve when the fan speed is greater than the preset speed after the air conditioner is turned on, the wind sound generated by the rotation of the fan can be used to cover the noise of the electronic expansion valve reset, thereby avoiding the noise of the electronic expansion valve reset after the air conditioner is turned off, and reducing the impact of the noise of the electronic expansion valve reset on the user. At the same time, by starting the reset of the electronic expansion valve at a long interval, the frequency of the noise generated during the electronic expansion valve reset process can be effectively reduced, thereby reducing the frequent nuisance of the noise of the electronic expansion valve reset to the user.

[0052] The following further describes various embodiments of the method for controlling the electronic expansion valve of the present application in conjunction with the accompanying drawings.

[0053] like Figure 1 As shown, Figure 11 is a flow chart of a control method for an electronic expansion valve provided by an embodiment of the present application. The control method for an electronic expansion valve may include but is not limited to step S110, step S120, and step S130.

[0054] Step S110: Detect the current rotation speed of the fan;

[0055] In one embodiment, the current speed of the air conditioner fan can be detected by using a dedicated tachometer tool, which is placed on the shaft of the speed shaft or at the position where the fan blades are connected. The tachometer will display the current speed value by measuring the rotation of the shaft; it can also be installed by installing a Hall sensor near the rotating shaft of the fan. When the fan blades rotate, the magnetic material or magnet on the rotating shaft will pass through the Hall sensor, thereby generating a magnetic field change to generate a signal. By detecting the frequency of these signals, the current speed of the fan can be calculated; it is also possible to install a vibration sensor on the fan equipment, and by detecting the vibration frequency generated when the fan rotates, the rotation frequency of the fan can be indicated according to the change in the vibration frequency. It is also possible to measure the voltage or current signal of the drive transformer, and then infer the feedback of the frequency converter, that is, by detecting the frequency or pulse amount of the voltage or current signal to predict the feedback of the frequency converter, and then accurately detect the current speed of the fan. In addition, the embodiment of the present application can also detect the air outlet speed of the air outlet to determine the speed of the fan.

[0056] It should be noted that the air conditioner fan is an important component in the refrigeration system, which is used to circulate air and adjust the indoor temperature and humidity. It is usually installed in the air conditioning equipment or in the air duct system inside the building. The air conditioner fan can be an indoor fan, which is usually installed in the indoor unit of the split air conditioner or central air conditioning system. The fan blades are driven by the motor to rotate, and the cold air or hot air is sent into the room to adjust the indoor temperature and humidity.

[0057] Step S120: when the current rotation speed is greater than the preset rotation speed, obtaining a reset control flag of the electronic expansion valve;

[0058] Specifically, it is worth noting that the determination of the preset speed can include the following steps: first, detecting the noise volume generated by the electronic expansion valve during the resetting period; then obtaining the wind sound volume of the air-conditioning fan at multiple different test speeds, wherein one test speed corresponds to one wind sound volume; then, screening out the target wind sound volume from the multiple wind sound volumes according to the noise volume; finally, taking the test speed corresponding to the target wind sound volume as the preset speed, thereby being able to accurately and effectively screen out the preset speed that can cover the noise generated by the resetting of the electronic expansion valve.

[0059] Furthermore, the preset speed may be 100 rpm, 200 rpm, 500 rpm, or 1000 rpm, which is not specifically limited in the embodiments of the present application.

[0060] The noise volume generated at different preset speeds can be 20db, 30db, 50db, or 60db, which is not specifically limited in the embodiments of the present application.

[0061] Step S130: When the reset control flag indicates that a reset operation is to be performed, the electronic expansion valve is reset.

[0062] It can be understood that when the reset control identifier indicates that a reset operation is to be performed, that is, the electronic expansion valve may have a fault or an abnormal condition, the electronic expansion valve sends an electronic signal to the air-conditioning control system or the main controller; then the air-conditioning control system receives the electronic signal and determines that the current electronic expansion valve needs to be reset; then the air-conditioning control system sends a reset instruction to the electronic expansion valve through an electronic signal or a control line; then after receiving the reset instruction, the electronic expansion valve performs a reset operation within a specified time, wherein, during the reset and resetting process of the electronic expansion valve, the electronic expansion valve restores its internal components or actuators to the initial position and resumes normal operation, thereby enabling the electronic expansion valve to accurately execute the opening command.

[0063] It should also be noted that the reset control identifier can be represented by Arabic numerals, such as binary number representation, decimal number representation, hexadecimal representation; it can also be represented by natural language, such as Chinese representation, English representation, French representation; it can also be represented by symbols, graphics and charts, such as mathematical symbol representation, symbol representation, chemical formula representation, flow chart representation, data chart representation, which is not specifically limited in the embodiments of the present application.

[0064] like Figure 2 As shown, Figure 2 This is a flow chart of a control method for an electronic expansion valve provided by another embodiment of the present application. After obtaining the reset control flag of the electronic expansion valve in the above step S120, the following steps may include but are not limited to step S210 and step S220.

[0065] Step S210: when the reset control flag indicates that the reset operation is not to be performed, the operating frequency of the compressor is obtained;

[0066] In one embodiment, when the reset control identifier indicates that the reset operation is not performed, the model and parameter specifications of the current air-conditioning compressor are first determined, and then, based on the model and parameter specifications of the air-conditioning compressor, an appropriate detection tool is selected to monitor the operating frequency of the compressor. The detection tool includes a frequency meter, a vibration sensor or other specific compressor testing instruments. Then, the detection tool is correctly connected to the external interface corresponding to the compressor and corresponding adjustments and connections are made, and then the air-conditioning system is started to start the air-conditioning compressor, and the normal operation of all related equipment is checked and its output data is recorded for subsequent frequency measurement; then, during the operation detection process, the detection tool can directly read and record the operating frequency of the current compressor through a visual interface or signal transmission, and then accurately measure the operating frequency of the current compressor for subsequent operations.

[0067] Step S220: adjusting the opening of the electronic expansion valve according to the operating frequency.

[0068] Specifically, the measured air-conditioning compressor frequency data is transmitted to the control system of the air conditioner for data analysis. According to the measured data, the operating frequency change value of the air-conditioning compressor is calculated. Then, according to the result of the compressor frequency change, the air-conditioning control system sends a signal to the electronic expansion valve to adjust the opening of the electronic expansion valve. When the compressor frequency is high, it means that the corresponding air-conditioning refrigeration system has a large cooling demand or the air-conditioning heating system has a large heating demand. Then, the opening of the electronic expansion valve can be increased accordingly to increase the flow rate of the refrigerant or heating agent required by the air-conditioning system. On the contrary, when the compressor frequency is low, it means that the corresponding air-conditioning refrigeration system has a small cooling demand or the air-conditioning heating system has a small heating demand. Then, the opening of the electronic expansion valve can be reduced accordingly to reduce the flow rate of the refrigerant or heating agent required by the air-conditioning system. It should also be noted that adjusting the opening of the electronic expansion valve according to the operating frequency of the air-conditioning compressor is a common control method, which is called variable frequency regulation. By adjusting the flow rate of the refrigerant according to the change of the compressor operating frequency, the stable operation and efficiency of the air-conditioning system can be maintained.

[0069] It should also be noted that the air conditioning control system usually continuously monitors and dynamically adjusts the opening of the electronic expansion valve according to the feedback information of the sensors inside the air conditioner, that is, the air conditioning control system is usually equipped with multiple sensors for monitoring key parameters, such as evaporator outlet temperature, return air temperature, evaporator outlet temperature, pressure, etc. These sensors can provide accurate data for the air conditioning control system to help determine the current real-time working conditions and system performance. Then, based on the data sensors and the preset control strategy, the air conditioning control system will balance the relationship between the evaporator temperature, return air temperature and the set temperature by using an algorithm or control model, and then calculate the current set electronic expansion valve opening. Then, according to the calculated target opening, the air conditioning control system will communicate and control with the controller or regulating device of the electronic expansion valve, and then send a corresponding control signal to adjust the opening of the electronic expansion valve in real time. Finally, when the air conditioning control system adjusts the opening of the electronic expansion valve, the air conditioning control system will monitor the performance parameters of the air conditioning system by continuously monitoring the sensor data and comparing it with the set target value. If the system performance does not meet expectations, the opening of the electronic expansion valve can be readjusted to optimize the control effect, thereby achieving better cooling effect and cooling control.

[0070] In addition, if Figure 3 As shown, Figure 3 This is a flow chart of a control method for an electronic expansion valve provided by another embodiment of the present application. The acquisition of the reset control flag of the electronic expansion valve in the above step S120 may include but is not limited to step S310 and step S320.

[0071] Step S310: when the value of the reset control flag is one, determining that the reset control flag represents the execution of a reset operation;

[0072] Specifically, when the air-conditioning control system detects that the value of the reset control identifier in the electronic expansion valve is one, the air-conditioning control system will perform a data query on the reset control identifier mapping table stored in the memory according to the reset control identifier, and then match the corresponding representation to perform the reset operation, and then convert the matched reset operation information into an electrical signal and send it to the electronic expansion valve, so that the electronic expansion valve performs the reset operation.

[0073] It should be noted that the value of the reset control identifier representing the execution of the reset operation can also be "01" in binary number, "1" in decimal number, "reset", "clear", "RST" in English words, "!", "*", "#" in symbols, "+" in mathematical symbols, and "reset" in Chinese, etc., which are not specifically limited in the embodiments of the present application.

[0074] Step S320: When the value of the reset control flag is zero, it is determined that the reset control flag indicates that the reset operation is not performed.

[0075] Specifically, when the air-conditioning control system detects that the value of the reset control identifier in the electronic expansion valve is zero, the air-conditioning control system will perform a data query on the reset control identifier mapping table stored in the memory according to the reset control identifier, and then match the corresponding representation as not performing the reset operation, and then convert it into an electrical signal to send to the electronic expansion valve, so that the electronic expansion valve does not perform the reset operation.

[0076] It should be noted that the value of the reset control identifier representing the execution of the reset operation can also be "00" in binary number, "0" in decimal number, "unreset", "unclear", "URST" in English words, "&" in symbols, "-" in mathematical symbols, and "not reset" in Chinese, etc., which are not specifically limited in the embodiments of the present application.

[0077] It should also be noted that the above matching information is converted into an electrical signal and sent to the electronic expansion valve, and the electrical signal can be a high or low level to represent the execution of the reset operation or not, for example: a high level indicates the execution of the reset operation information, and a low level indicates the non-execution of the reset operation information, and vice versa. In the process of converting the matching information into an electrical signal and sending it to the electronic expansion, the matching information needs to be encoded and adjusted, and then the matching information is converted by an analog converter (ADC), and its digital signal is converted into a corresponding analog electrical signal, and the converted analog electrical signal is transmitted through an appropriate transmission medium, such as a wire or wireless communication, and then the interface end of the electronic expansion valve decodes the transmitted signal and generates the original electrical signal, and the decoded electrical signal may need to be further processed, such as simulation, amplification or adjustment, and finally, the processed signal is transmitted from the interface end of the electronic expansion valve to the processing controller of the electronic expansion valve.

[0078] In addition, if Figure 4 As shown, Figure 4 This is a flow chart of a control method for an electronic expansion valve provided by another embodiment of the present application. After the electronic expansion valve is reset in step S130, the following steps may include but are not limited to step S410 and step S430.

[0079] Step S410: obtaining a target initial opening;

[0080] Specifically, the air conditioning control system can access the memory through the controller to obtain the target initial opening pre-stored in the memory, wherein the target initial opening is usually the recommended value for the initial opening of the electronic expansion valve provided by the manufacturer. These values ​​are determined according to the system design and performance requirements, and can be used as reference values ​​to determine the target initial opening. The target initial opening can also be determined by testing and calculating the pressure and temperature at the inlet and outlet of the air conditioning system. The target initial opening can also be determined by performing a series of tests and adjustments during the installation or commissioning of the air conditioning system, such as by monitoring the performance indicators of the system during operation (such as refrigeration effect, operating stability, etc.), and gradually adjusting the opening of the electronic expansion valve until the optimal operating state is reached, thereby determining the target initial opening.

[0081] It should also be noted that the target initial opening can be 200 steps, 220 steps, 250 steps, 300 steps, 400 steps, etc., and is not specifically limited in the embodiments of the present application.

[0082] Step S420: adjusting the opening of the electronic expansion valve to a target initial opening;

[0083] Specifically, after the air conditioning control system reads the target initial opening, it converts its adjustment information into a corresponding electrical signal and then sends it to the electronic expansion valve. Then, when the electronic expansion valve receives the corresponding electrical signal, the electronic expansion valve will rotate the adjustment screw on the electronic expansion valve under the control of the voltage or current on the expansion valve, thereby stopping the flow of the refrigerant and closing the electronic expansion valve. When the electronic expansion valve stops working, the electronic expansion valve will automatically execute the reset procedure according to the preset reset logic or control algorithm, and then the electronic expansion valve will control the valve to be fully opened and fully closed, and ensure that the electronic expansion valve is under the effective control of the control system during the reset process through the interference pulse, and then adjust the valve of the electronic expansion valve to the target initial opening. Finally, after completing the reset procedure, the electronic expansion valve will reopen the valve, resume control of the refrigerant flow and start working normally again, and then the electronic expansion valve can be accurately and accurately adjusted to the target initial opening through the control system, effectively solving the problem of the electronic expansion valve losing step.

[0084] It should also be noted that the out-of-step problem of the electronic expansion valve is an abnormal situation, which manifests itself as the input pulse signal cannot make the rotor move to the predetermined position, resulting in the air-conditioning operation state unable to maintain the required pressure and temperature, and even causing overheating or overcooling, which is often manifested as the exhaust temperature and the valve opening adjustment not matching. The out-of-step phenomenon of the electronic expansion valve can be solved by resetting the electronic expansion valve. The electronic expansion valve itself can be checked for faults through resetting. When the electronic expansion valve fails, it will send an alarm message to the air-conditioning control system and then stop the air-conditioning. It can also check the accuracy and stability of the control signal transmitted between the air-conditioning control system and the electronic expansion valve to ensure that the input value is correct and not interfered with. In response to changes in system load, the electronic expansion valve can be reset to restore the response loss to load changes during operation.

[0085] Step S430: adjusting the reset control flag so that the reset control flag is used to indicate that the reset operation is not performed.

[0086] Specifically, after adjusting the electronic expansion valve to the target initial opening through the air-conditioning control system, it is also necessary to change the original reset control flag indicating the execution of the reset operation to an indication that the reset operation is not executed, thereby maintaining the working cycle of the electronic expansion valve reset and the continuous operation of the electronic expansion valve in the air conditioner, reducing human intervention in adjusting the reset process of the electronic expansion valve.

[0087] It should also be noted that the reset control flag may be adjusted to a value indicating that the reset operation is not performed, which may be zero.

[0088] In addition, if Figure 5 As shown, Figure 5 This is a flow chart of a control method for an electronic expansion valve provided by another embodiment of the present application. After the above step S110 detects the current speed of the fan, it may include but is not limited to step S510 and step S520.

[0089] Step S510: when the current speed is less than or equal to the preset speed, obtaining the target initial opening;

[0090] In one embodiment, when the air conditioning control system detects in real time that the current speed of the fan is less than or equal to the preset speed in the air conditioner, the air conditioning control system will read the target initial opening from the memory through the I / O, and then perform data encoding and data adjustment on the target initial opening, and then convert the matching information through the analog converter (ADC), convert its digital signal into a corresponding analog electrical signal, and transmit the converted analog electrical signal through an appropriate transmission medium, such as a wire or wireless communication, and then the interface end of the electronic expansion valve decodes the transmitted signal and generates the original electrical signal. The decoded electrical signal may need to be further processed, such as simulation, amplification or adjustment, and finally, the processed signal is transmitted from the interface end of the electronic expansion valve to the processing controller of the electronic expansion valve.

[0091] Step S520: adjusting the opening of the electronic expansion valve to the target initial opening.

[0092] Specifically, the electronic expansion valve receives the target initial opening electrical signal sent by the corresponding air conditioning control system, and the electronic expansion valve will rotate the adjusting screw on the electronic expansion valve under the control of the voltage or current on the expansion valve, thereby stopping the flow of the refrigerant and closing the electronic expansion valve. When the electronic expansion valve stops working, the electronic expansion valve will automatically execute the reset procedure according to the preset reset logic or control algorithm, and then the electronic expansion valve will control the valve to be fully opened and fully closed, and ensure that the electronic expansion valve is under the effective control of the control system during the reset process through the interference pulse, and then adjust the valve of the electronic expansion valve to the target initial opening, and finally complete the reset procedure, the electronic expansion valve will reopen the valve, restore the control of the refrigerant flow and start working normally again, and then the electronic expansion valve can be accurately adjusted to the target initial opening through the control system, effectively solving the problem of the electronic expansion valve out of step.

[0093] In addition, if Figure 6 As shown, Figure 6 This is a flow chart of a control method for an electronic expansion valve provided by another embodiment of the present application. After resetting the electronic expansion valve in step S130, the following steps may include but are not limited to step S610 and step S620.

[0094] Step S610: Counting the working time of the electronic expansion valve;

[0095] In one embodiment, a scheduled task is first created, and a preset statistical duration is determined in the scheduled task. When the air conditioner is in a powered-on state, the air conditioning control system will call and suspend the above-mentioned scheduled task, and by setting a timer, the working duration of the electronic expansion valve each time it continues to work in the powered-on state is accumulated and counted at intervals of one second. When its working duration does not reach the preset duration of the timer, the above-mentioned scheduled task is always in a suspended state, and the task process enters a suspended queue, thereby ensuring that the scheduled task will not be mistakenly executed before reaching the preset duration of the timer in the powered-on state.

[0096] Step S620: When the working time is greater than or equal to the preset time, the reset control flag is adjusted so that the reset control flag is used to indicate the execution of the reset operation.

[0097] Specifically, when the air-conditioning control system detects that the working time of the electronic expansion valve each time in the power-on state is greater than or equal to the preset time of the timer, the timed task suspended in the air-conditioning control system will be awakened, and then the above-mentioned timed task will be called to adjust the reset control flag to indicate the execution of the reset operation. After the adjustment, the timed task will clear the working time of the electronic expansion valve in the timer, and then enter the suspended state again, waiting for the next working time to meet the preset time of the timer before waking up to execute the task, thereby effectively reducing the frequency of resetting the electronic expansion valve, reducing the wear of the electronic expansion valve caused by resetting, and reducing the service life of the electronic expansion valve. At the same time, it can also effectively reduce the frequency of noise generated during the resetting process of the electronic expansion valve through long intervals.

[0098] It should be noted that the above-mentioned preset duration can be determined by the following steps: obtaining the opening control error of the electronic expansion valve under multiple different test durations, wherein one test duration corresponds to one opening control error; selecting candidate test durations with an opening control error greater than the preset error from multiple test durations; and taking the candidate test duration with the shortest duration as the preset duration. The preset duration can further be 3 days, 4 days, 5 days, or 7 days. The specific preset duration also needs to be determined based on the specific parameters and scale of the current air conditioner, and the optimal preset duration can be obtained through multiple error test analyses.

[0099] Furthermore, the above-mentioned opening control error analysis can use the deviation analysis method to evaluate the accuracy of the opening control by calculating the difference between the actual opening and the expected opening. The deviation can be obtained by subtracting the actual opening from the expected opening. According to the actual situation, the manipulation and tilt of the deviation can be analyzed, and statistical analysis can be performed to evaluate the performance of the control system. The dynamic response analysis method can also be used to observe the output response of the system by stimulating the system with dynamic input signals. From the output response, the system's overshoot, support posture, response time and other performance indicators can be obtained to evaluate and adjust the preset duration of the system's operation; the system modeling and simulation method can also be used to establish a mathematical model of the system and conduct simulation experiments by using system modeling and simulation tools to predict the performance of the system, analyze the source of errors and adjust the preset duration of the system's operation.

[0100] It should also be noted that the reset control flag may be a value of one, which indicates that a reset operation is being performed.

[0101] In addition, if Figure 7 As shown, Figure 7 It is an overall flow chart of a control method for an electronic expansion valve provided by an embodiment of the present application, which may include but is not limited to step S701 and step S710.

[0102] Step S701: Detect the current speed of the fan;

[0103] Step S702: determining whether the current rotation speed is greater than a preset rotation speed;

[0104] Step S703: If the current speed is greater than the preset speed, proceed to step S705;

[0105] Step S704: If the current rotation speed is less than or equal to the preset rotation speed, the target initial opening is obtained, and the opening of the electronic expansion valve is adjusted to the target initial opening.

[0106] Step S705: determining whether the electronic expansion valve reset control flag indicates that a reset operation is to be performed;

[0107] Step S706: if the reset control flag indicates that the reset operation is to be performed, the target initial opening is obtained, the opening of the electronic expansion valve is adjusted to the target initial opening, the reset control flag is adjusted to indicate that the reset operation is not to be performed, and the process proceeds to step S708;

[0108] Step S707: if the reset control flag indicates that the reset operation is not to be performed, directly proceed to step S708;

[0109] Step S708: obtaining the operating frequency of the compressor, and adjusting the opening of the electronic expansion valve according to the operating frequency;

[0110] Step S709: Counting the working time of the electronic expansion valve;

[0111] Step S710: determining whether the working time of the electronic expansion valve is greater than a preset time;

[0112] Step S711: if the working time of the electronic expansion valve is greater than or equal to the preset time, adjusting the reset control flag to indicate that a reset operation is performed;

[0113] Step S712: If the working time of the electronic expansion valve is less than the preset time, no processing is performed;

[0114] Specifically, the specific implementation process of the above overall flow has been specifically described in the above embodiments and will not be repeated here.

[0115] It should also be noted that based on the above Figure 7 The control method of the present application includes but is not limited to the following technical effects:

[0116] 1. By detecting the current speed of the fan; then, when the current speed is greater than the preset speed, the embodiment of the present application will obtain the reset control mark of the electronic expansion valve; then, when the reset control mark indicates the execution of the reset operation, the embodiment of the present application will reset the electronic expansion valve. Since the embodiment of the present application resets the electronic expansion valve when the fan speed is greater than the preset speed after the air conditioner is turned on, the wind sound generated by the rotation of the fan can cover the noisy sound of the electronic expansion valve reset, thereby avoiding the noisy sound of the electronic expansion valve reset after the air conditioner is turned off, and reducing the impact of the noise when the electronic expansion valve is reset on the user.

[0117] 2. In the embodiment of the present application, the reset start of the electronic expansion valve is controlled by the air-conditioning control system at long intervals, which can effectively reduce the frequency of noise generated during the reset process of the electronic expansion valve, thereby reducing the frequent nuisance of the user to the noise during the reset of the electronic expansion valve.

[0118] 3. In the embodiment of the present application, the reset start of the electronic expansion valve is controlled by the air-conditioning control system at long intervals, which can also effectively reduce the frequency of resetting the electronic expansion valve, reduce the wear of the electronic expansion valve caused by resetting, and thus extend the service life of the electronic expansion valve.

[0119] Based on the control methods of the electronic expansion valve in the above-mentioned embodiments, various embodiments of the controller, the air conditioner and the computer-readable storage medium of the present application are respectively proposed below.

[0120] like Figure 8 As shown, Figure 81 is a schematic diagram of a controller for executing a control method for an electronic expansion valve provided by an embodiment of the present application. The controller 100 implemented in the present application includes: a processor 110, a memory 120, and a computer program stored in the memory 120 and executable on the processor 110, wherein: Figure 8 In the figure, a processor 110 and a memory 120 are taken as an example.

[0121] The processor 110 and the memory 120 may be connected via a bus or other means. Figure 8 The example of connecting through bus is taken in the following.

[0122] The memory 120, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 120 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 120 may optionally include a memory 120 remotely arranged relative to the processor 110, and these remote memories 120 may be connected to the controller 100 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0123] It should also be noted that the memory 120 may include one or more storage applications or data, and may also include one or more operating systems, such as Harmony OS TM, RTOS TM, Unix TM, Linux TM, RTLinux TM, etc.

[0124] Those skilled in the art will understand that Figure 8 The device structure shown in the figure does not constitute a limitation on the controller 100, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0125] exist Figure 8 In the controller 100 shown, the processor 110 can be used to call the control program of the electronic expansion valve stored in the memory 120, so as to implement the control method of the electronic expansion valve described above. Specifically, the non-transient software program and instructions required to implement the control method of the electronic expansion valve of the above embodiment are stored in the memory 120, and when executed by the processor 110, the control method of the electronic expansion valve of the above embodiment is executed.

[0126] It is worth noting that since the controller 100 of the embodiment of the present application can execute the control method of the electronic expansion valve of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the controller 100 of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the electronic expansion valve of any of the above-mentioned embodiments.

[0127] In addition, an embodiment of the present application further provides an air conditioner, comprising the controller of the above embodiment.

[0128] It is worth noting that since the air conditioner of the embodiment of the present application includes the controller of the above-mentioned embodiment, and the controller of the above-mentioned embodiment can execute the control method of the electronic expansion valve of any of the above-mentioned embodiments, the specific implementation manner and technical effects of the air conditioner of the embodiment of the present application can refer to the specific implementation manner and technical effects of the control method of the electronic expansion valve of any of the above-mentioned embodiments.

[0129] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above-described electronic expansion valve control method. Figures 1 to 7 The method steps in .

[0130] It is worth noting that since the computer-readable storage medium of the embodiment of the present application can execute the control method of the electronic expansion valve of any of the above-mentioned embodiments, the specific implementation methods and technical effects of the computer-readable storage medium of the embodiment of the present application can refer to the specific implementation methods and technical effects of the control method of the electronic expansion valve of any of the above-mentioned embodiments.

[0131] It will be appreciated by those skilled in the art that all or some of the steps and systems in the methods disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled 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 include, but are not limited to, random access memory (RAM), read-only memory (ROM), electrically erasable programmable read only memory (EEPROM) flash memory or other memory technology, compact disc-read only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cassettes, magnetic tapes, magnetic disks, 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, it is well known to those of ordinary skill in the art that communication media generally include computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0132] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0133] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, apparatuses and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of apparatuses or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0134] It should also be understood that the various implementations provided in the embodiments of the present invention can be combined arbitrarily to achieve different technical effects.

[0135] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions under the shared conditions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A control method for an electronic expansion valve, characterized in that: include: Detect the current speed of the fan; When the current rotation speed is greater than a preset rotation speed, obtaining a reset control flag of the electronic expansion valve; When the reset control mark indicates that a reset operation is performed, the electronic expansion valve is reset.

2. The control method according to claim 1, characterized in that: After obtaining the reset control identifier of the electronic expansion valve, the control method further includes: When the reset control flag indicates that the reset operation is not to be performed, obtaining the operating frequency of the compressor; The opening degree of the electronic expansion valve is adjusted according to the operating frequency.

3. The control method according to claim 2, characterized in that: Also includes: When the value of the reset control flag is one, determining that the reset control flag represents the execution of a reset operation; When the value of the reset control flag is zero, it is determined that the reset control flag represents that a reset operation is not performed.

4. The control method according to claim 1, characterized in that: After resetting the electronic expansion valve, the control method further includes: Get the target initial opening; adjusting the opening of the electronic expansion valve to the target initial opening; The reset control flag is adjusted so that the reset control flag is used to indicate that a reset operation is not performed.

5. The control method according to claim 1, characterized in that: After detecting the current rotation speed of the fan, the control method further includes: When the current rotation speed is less than or equal to the preset rotation speed, obtaining a target initial opening; The opening of the electronic expansion valve is adjusted to the target initial opening.

6. The control method according to claim 1, characterized in that: After resetting the electronic expansion valve, the control method further includes: Counting the working time of the electronic expansion valve; When the working time is greater than or equal to a preset time, the reset control flag is adjusted so that the reset control flag is used to indicate the execution of a reset operation.

7. The control method according to claim 6, characterized in that: The adjusting the reset control flag includes: adjusting a value of the reset control flag to one.

8. A controller, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the control method according to any one of claims 1 to 7 when executing the computer program.

9. An air conditioner, characterized in that: Comprising a controller as claimed in claim 8.

10. A computer-readable storage medium, characterized in that: Computer executable instructions are stored, and the computer executable instructions are used to execute the control method according to any one of claims 1 to 7.

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