Electronic expansion valve out-of-step control method and device and computer readable storage medium

Abstract

The embodiment of the invention discloses an out-of-step control method and device for an electronic expansion valve and a computer readable storage medium, and relates to the technical field of out-of-step control. When the change trend of the exhaust temperature value and the exhaust superheat degree meets the preset trend, it is judged that the electronic expansion valve is in an out-of-step state; if the exhaust superheat degree meets a first preset condition, the electronic expansion valve is controlled to execute a first reset action; and if the exhaust superheat degree meets a second preset condition, the electronic expansion valve is controlled to execute a second reset action. Therefore, by receiving the opening signal of the electronic expansion valve, the out-of-step is judged according to the exhaust temperature, the superheat degree trend and the preset conditions, the reset action is executed, the stability of the heat pump system is guaranteed, and the operation performance is improved. Equipment damage and system shutdown caused by out-of-step of the electronic expansion valve are avoided, the adjusting precision can be improved, the refrigerant flow can be accurately adjusted and controlled, the system adaptability is enhanced, and the system adapts to various working conditions.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of out-of-step control, and in particular to a method and device for out-of-step control of an electronic expansion valve and a computer-readable storage medium. Background Art

[0002] The electronic expansion valve is the most commonly used throttling component in the air conditioning system. Due to the motor control speed, load torque, rotor inertia, accumulation of impurities in the system, etc., the rotor may not fully rotate to the predetermined position of the control pulse given by the controller, resulting in a loss of step. For low-temperature air source heat pumps, especially the economizer enthalpy increase air supply system, the outdoor ambient temperature below -20℃ requires extremely high control accuracy of the main electronic expansion valve. If there is a loss of step during operation, or even cumulative loss of step, it will cause the system to lose control, resulting in high power consumption, low heating efficiency, high exhaust temperature, compressor liquid return and other adverse consequences.

[0003] In the related art, the commonly used electronic expansion valve reset action belongs to passive reset control, which is generally performed once when the unit is in standby, fault shutdown, shutdown, first startup, etc. If the unit is started for a long time and there is a long-term accumulated out-of-step phenomenon, the unit operation parameters will be abnormal and cannot be automatically diagnosed. Summary of the invention

[0004] The embodiments of the present disclosure provide an electronic expansion valve out-of-step control method, device and computer-readable storage medium, aiming to solve one of the technical problems in the related art at least to a certain extent.

[0005] In a first aspect, an embodiment of the present disclosure provides an electronic expansion valve out-of-step control method, which is applied to a heat pump system. The method includes:

[0006] Receive the continuous action signal of the electronic expansion valve opening;

[0007] When the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a step-out state;

[0008] If the exhaust gas superheat satisfies a first preset condition, controlling the electronic expansion valve to perform a first resetting action;

[0009] If the exhaust gas superheat satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

[0010] In a second aspect, the embodiment of the present disclosure further provides an electronic expansion valve out-of-step control device, the device comprising:

[0011] A receiving module, used for receiving a continuous action signal of the electronic expansion valve;

[0012] A judgment module, used for judging that the electronic expansion valve is in a step-out state when the variation trends of the exhaust temperature value and the exhaust superheat degree meet the preset trends;

[0013] A first control module, configured to control the electronic expansion valve to perform a first reset action if the exhaust gas superheat satisfies a first preset condition;

[0014] The second control module is used to control the electronic expansion valve to perform a second resetting action if the exhaust gas superheat satisfies a second preset condition.

[0015] In a third aspect, an embodiment of the present disclosure further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps in the above-mentioned electronic expansion valve out-of-step control method when executed by the processor.

[0016] In a fourth aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the above-mentioned electronic expansion valve out-of-step control method are implemented.

[0017] In a fifth aspect, the embodiments of the present disclosure further provide a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. The processor of the computer device reads the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method provided in various optional implementations of the embodiments of the present disclosure.

[0018] In the disclosed embodiment, first, a continuous action signal of the electronic expansion valve opening is received, and then when the trend of changes in the exhaust temperature value and the exhaust superheat meets the preset trend, it is determined that the electronic expansion valve is in a state of loss of step, and then if the exhaust superheat meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust superheat meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving a continuous action signal of the electronic expansion valve opening, the loss of step is determined according to the exhaust temperature, superheat trend and preset conditions, and a reset action is performed to ensure the stability of the heat pump system and improve the operating performance. Avoiding equipment damage and system shutdown caused by the loss of step of the electronic expansion valve can improve the adjustment accuracy, accurately control the refrigerant flow, enhance the system adaptability, and adapt to various working conditions.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a flow chart of a method for controlling an out-of-step electronic expansion valve provided in the first embodiment of the present disclosure;

[0022] Figure 2 is a flow chart of a method for controlling an out-of-step electronic expansion valve provided in a second embodiment of the present disclosure;

[0023] Figure 3 is a flow chart of a method for controlling an electronic expansion valve out-of-step according to a third embodiment of the present disclosure;

[0024] Figure 4 is a flow chart of a method for controlling an out-of-step electronic expansion valve provided in a fourth embodiment of the present disclosure;

[0025] Figure 5 It is a flow chart of the self-diagnosis and reset function of an electronic expansion valve out of step;

[0026] Figure 6 is a structural schematic diagram of an electronic expansion valve out-of-step control device provided in an embodiment of the present disclosure;

[0027] Figure 7 It is a schematic diagram of the structure of an electronic device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0028] Some embodiments of the present disclosure will be described in detail here, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Various changes, modifications and equivalents of the methods, devices and / or systems described herein will become apparent after understanding the present disclosure. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but can be changed as becomes apparent after understanding the present disclosure, except for operations that must be performed in a specific order. In addition, for clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0030] It should be noted that the execution subject of the electronic expansion valve out-of-step control method of this embodiment may be an electronic expansion valve out-of-step control device, which may be configured in any type of electronic equipment and is not limited here.

[0031] In the disclosed embodiment, the “electronic expansion valve out-of-step control device” is used as the execution subject to execute the “electronic expansion valve out-of-step control method” for illustration, and no limitation is made herein.

[0032] It should be noted that the description order of the following embodiments is not intended to limit the priority order of the embodiments.

[0033] Figure 1 It is a flow chart of the electronic expansion valve out-of-step control method provided according to the first embodiment of the present disclosure.

[0034] like Figure 1 As shown, the method includes:

[0035] Step 101, receiving a continuous opening action signal of an electronic expansion valve.

[0036] In the disclosed embodiment, the electronic expansion valve is a key component of the heat pump unit, which is responsible for regulating the flow of refrigerant entering the evaporator, thereby ensuring the efficient operation of the heat pump system. The electronic expansion valve allows the medium-temperature and high-pressure gaseous refrigerant to become a low-temperature and low-pressure liquid refrigerant through its throttling, and then the liquid refrigerant absorbs heat in the evaporator to achieve a cooling effect. The electronic expansion valve controls the valve flow through the change of superheat on one side of the evaporator to prevent insufficient utilization of the evaporator area and liquid knocking of the compressor.

[0037] The continuous opening action signal indicates that the opening of the electronic expansion valve continues to move according to a certain change trend, for example, the opening continues to be opened larger or the opening continues to be closed smaller, which is not limited here.

[0038] For example, if an action signal indicating that the opening of the electronic expansion valve is continuously increasing is received, it means that the opening of the electronic expansion valve is currently monitored to be continuously increasing.

[0039] It is understandable that if the heat pump system receives the continuous action signal of the electronic expansion valve opening, it can determine whether the electronic expansion valve is out of step according to the subsequent steps. That is, the heat pump system receiving the continuous action signal of the electronic expansion valve opening can serve as a trigger condition for the subsequent steps.

[0040] Step 102: When the variation trends of the exhaust gas temperature value and the exhaust gas superheat satisfy the preset trends, it is determined that the electronic expansion valve is in a step-out state.

[0041] Among them, the exhaust temperature can be the temperature of the high-temperature gaseous refrigerant discharged after the compressor compresses the refrigerant from the low-temperature gaseous refrigerant. It is an important parameter in the refrigeration system and is directly related to the performance and stability of the system. The exhaust temperature has an important impact on the efficiency and life of the compressor. High exhaust temperature will cause the refrigerant to overheat inside the compressor, reduce the refrigeration efficiency and increase energy consumption. In addition, too high exhaust temperature will also increase the thermal stress of the internal components of the compressor and shorten the service life of the compressor.

[0042] Among them, the exhaust superheat can be used to measure whether the temperature of the refrigerant gas discharged from the compressor is higher than the saturation temperature corresponding to its pressure. It is an important thermodynamic parameter in refrigeration and heat pump systems, used to describe the temperature conditions of the refrigerant in different states in the system. As an example, the exhaust superheat can be obtained by subtracting the exhaust temperature from the high-pressure saturation temperature.

[0043] It should be noted that the variation trend of the exhaust temperature value and the exhaust superheat degree may satisfy the preset trend, that is, the exhaust temperature value continues to decrease and the exhaust superheat degree continues to decrease. In other embodiments, the variation trend of the exhaust temperature value and the exhaust superheat degree may satisfy the preset trend, that is, the exhaust temperature value continues to increase and the exhaust superheat degree continues to increase.

[0044] For different electronic expansion valve opening continuous action signals, the preset trends that the exhaust temperature value and the exhaust superheat need to meet may be different.

[0045] As a possible implementation method, when the heat pump system does not start the enthalpy increase mode, the heat pump system receives an action signal that the opening of the electronic expansion valve is continuously closed. Then, when the changing trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step. Specifically, if the changing trends of the exhaust temperature value and the exhaust superheat are both decreasing, the preset trends are met, and it is judged that the electronic expansion valve is in a state of out-of-step.

[0046] Among them, the enthalpy increase mode can be a working mode adopted by the heat pump system to improve energy efficiency, which improves efficiency by increasing the enthalpy value in the cooling or heating cycle.

[0047] Among them, receiving the signal that the opening of the electronic expansion valve is continuously decreasing indicates that the opening of the electronic expansion valve is continuously decreasing. If the change trends of the exhaust temperature value and the exhaust superheat are both decreasing, it means that the preset trend is met.

[0048] It should be noted that when the electronic expansion valve is not in enthalpy increase mode, it may not be accurate or efficient enough to regulate the flow of refrigerant. If the electronic expansion valve continues to close at this time, the refrigerant flow through the expansion valve will decrease. The reduction in refrigerant flow will cause insufficient refrigerant in the evaporator, which will not be able to fully absorb heat, and thus reduce the exhaust temperature and exhaust superheat of the equipment. In this case, the electronic expansion valve is out of step, which means that its action is inconsistent with the expected control target, resulting in a decrease in system performance.

[0049] Step 103: If the exhaust gas superheat satisfies a first preset condition, the electronic expansion valve is controlled to perform a first reset action.

[0050] The out-of-step state of the electronic expansion valve can be divided into severe out-of-step or non-severe out-of-step, which is not limited here.

[0051] It should be noted that serious out-of-step and non-serious out-of-step have different impacts, so different out-of-step control methods can be used, that is, the heat pump system can use different preset actions to perform out-of-step control.

[0052] The first preset condition may be a judgment condition indicating that the electronic expansion valve is seriously out of step. If the heat pump system detects that the exhaust gas superheat satisfies the first preset condition, it indicates that the electronic expansion valve may be seriously out of step.

[0053] The first resetting action may be a resetting action that needs to be performed when the electronic expansion valve is in a serious state of loss of step.

[0054] As a possible implementation method, if the exhaust gas superheat is greater than the reference exhaust gas superheat, the heat pump system determines that the exhaust gas superheat satisfies the first preset condition, and then the electronic expansion valve can be controlled to perform a first reset action, specifically:

[0055] Control the heat pump system to execute shutdown action;

[0056] The electronic expansion valve is reset according to a preset first reset number.

[0057] It should be noted that if the heat pump system is turned on in the enthalpy increase mode, when the electronic expansion valve is reset, the reset action may be performed on the main electronic expansion valve, that is, the main electronic expansion valve.

[0058] Specifically, when the electronic expansion valve is in a state of out-of-step, if the exhaust superheat corresponding to the device is greater than the reference exhaust superheat, the heat pump system can determine that the degree of out-of-step of the electronic expansion valve is severe.

[0059] The reference exhaust gas superheat can be determined based on a conventional exhaust gas superheat, such as 140% of a conventional exhaust gas superheat. The range of conventional exhaust gas superheat varies depending on the specific type and operating conditions of the refrigeration system. Generally speaking, in normal refrigeration system operation, the exhaust gas superheat will remain within a relatively stable range.

[0060] As a possible implementation method, the device is a heat pump heater, and the device can obtain a reference exhaust superheat associated with the current ambient temperature and the current water outlet temperature of the device based on a preset mapping relationship.

[0061] It should be noted that the ambient temperature, outlet water temperature, and exhaust superheat can be used as three key parameters, respectively as the X, Y, and Z axes, to establish a one-to-one correspondence between them. For example, a three-dimensional coordinate system is established with the ambient temperature as the X axis, the outlet water temperature as the Y axis, and the reference exhaust superheat as the Z axis. The device can determine the corresponding reference exhaust superheat based on the current ambient temperature and the current outlet water temperature of the device.

[0062] Optionally, if the heat pump system detects that the electronic expansion valve is seriously out of step, it is first necessary to immediately force shutdown and then perform repairs.

[0063] The first number of resets may be a preset number of resets required to be performed when the electronic expansion valve is in a serious out-of-step state, for example, 2 times, which is not limited here.

[0064] Specifically, each time the electronic expansion valve is reset and controlled, the following implementation method may be adopted.

[0065] Optionally, based on the maximum number of steps of the electronic expansion valve, the electronic expansion valve can be controlled to open to a preset number of steps and close to a preset number of steps in succession, where the preset number of steps is the maximum pulse multiplied by a preset multiple, and then the electronic expansion valve is restored to the initial opening.

[0066] The preset multiple may be 1, 2, 3 or any multiple, and may be set based on actual experience, and is not limited here.

[0067] It should be noted that the maximum pulse of electronic expansion valves of different models may be different, for example, some may be 500B, and some may be 550B, which is not limited here.

[0068] The preset number of steps is the amplitude of the action set according to the maximum pulse. If the preset multiple is 2, it means that the preset number of steps is 2 times the maximum pulse. For example, if the maximum pulse is 500B and the preset multiple is 2, the preset number of steps can be set to 1000B, which is not limited here.

[0069] Specifically, the electronic expansion valve may be first controlled to open to a preset number of steps, then controlled to close to a preset number of steps, and finally the electronic expansion valve may be restored to an initial opening.

[0070] For example, the electronic expansion valve will receive an action command to open wide, and the preset number of steps is set to twice the maximum pulse of the electronic expansion valve, that is, 2F(max). Here, F(max) refers to the maximum pulse that the electronic expansion valve can receive. For example, if the maximum pulse of a certain model of electronic expansion valve is 500B, then in this step, the electronic expansion valve will receive an action command to open wide by 1000B (that is, 2×500B). By executing this step, it can be ensured that the valve core or actuator of the electronic expansion valve can move fully, thereby possibly eliminating the problem of out-of-step caused by valve core jamming or actuator failure.

[0071] After that, the electronic expansion valve performs a closing action, and the closing amplitude is 2F(max). The electronic expansion valve will receive a closing action instruction, and the number of closing steps is also set to twice the maximum pulse of the electronic expansion valve, that is, 2F(max). This corresponds to the opening action in the previous step, and is intended to further eliminate possible out-of-step problems by moving the valve core or actuator in the opposite direction. By executing this step, the responsiveness of the electronic expansion valve can be further verified and its normal working state can be attempted to be restored. After completing the above-mentioned opening and closing actions, the electronic expansion valve will be adjusted back to a preset initial opening. This initial opening is usually determined based on system requirements and the design characteristics of the electronic expansion valve, and is intended to ensure that the system can operate in a relatively stable state when it is turned on. Therefore, by restoring to the initial opening, it can be ensured that the electronic expansion valve can start working in a suitable state when it is turned on, which helps to stabilize the operation of the system and improve energy efficiency.

[0072] It should be noted that if the first reset number is 2 times, it means that the electronic expansion valve needs to repeat the above reset steps twice to ensure the accuracy of the reset.

[0073] Step 104: If the exhaust gas superheat satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

[0074] Optionally, if the exhaust superheat is less than or equal to the reference exhaust superheat, it is determined that the exhaust superheat satisfies the second preset condition, and then the electronic expansion valve can be controlled to perform a second reset action, specifically:

[0075] When the compressor frequency of the heat pump system is reduced to the target frequency, the electronic expansion valve is reset according to a preset second reset number of times.

[0076] It should be noted that if the heat pump system is turned on in the enthalpy increase mode, when the electronic expansion valve is reset, the reset action may be performed on the main electronic expansion valve, that is, the main electronic expansion valve.

[0077] The second preset condition may be a judgment condition indicating that the electronic expansion valve is in a non-serious out-of-step state. If the heat pump system detects that the exhaust gas superheat satisfies the second preset condition, it indicates that the electronic expansion valve may be in a non-serious out-of-step state.

[0078] The second resetting action may be a resetting action that needs to be performed when the electronic expansion valve is in a non-serious out-of-step state.

[0079] The target frequency refers to the compressor frequency range that the equipment should maintain during normal operation, or it may be a specific frequency value, which is not limited here.

[0080] It should be noted that during the cooling or heating cycle, especially in a low temperature and high humidity environment, the evaporator surface of the heat pump system may frost. Frosting will affect the heat exchange efficiency, so the heat pump system will perform defrosting operations regularly to restore the performance of the heat exchanger. Among them, it is usually necessary to reduce the compressor frequency of the heat pump system during the defrosting operation.

[0081] It can be understood that if the compressor frequency of the heat pump system is reduced to the target frequency and the exhaust superheat is less than or equal to the reference exhaust superheat, it means that the overall operating state of the electronic expansion valve is still within an acceptable range, and the normal operation of the electronic expansion valve can be restored through a reset operation.

[0082] The second number of resets may be a preset number of resets required to be performed when the electronic expansion valve is in a non-serious out-of-step state, such as 1 time, which is not limited here.

[0083] It can be understood that by timely resetting the electronic expansion valve that is not seriously out of step, the reduction in cooling / heating capacity and energy efficiency loss caused by valve body out of step can be reduced, thereby improving the overall stability and performance of the system and avoiding user discomfort and increased system downtime caused by direct shutdown.

[0084] It should be noted that the specific steps for resetting the electronic expansion valve may refer to the above step 103 and will not be described in detail here.

[0085] In the disclosed embodiment, first, a continuous action signal of the electronic expansion valve opening is received, and then when the trend of changes in the exhaust temperature value and the exhaust superheat meets the preset trend, it is determined that the electronic expansion valve is in a state of loss of step, and then if the exhaust superheat meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust superheat meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving a continuous action signal of the electronic expansion valve opening, the loss of step is determined according to the exhaust temperature, superheat trend and preset conditions, and a reset action is performed to ensure the stability of the heat pump system and improve the operating performance. Avoiding equipment damage and system shutdown caused by the loss of step of the electronic expansion valve can improve the adjustment accuracy, accurately control the refrigerant flow, enhance the system adaptability, and adapt to various working conditions.

[0086] Figure 2 It is a flow chart of the electronic expansion valve out-of-step control method provided according to the second embodiment of the present disclosure.

[0087] like Figure 2 As shown, the method includes:

[0088] Step 201, when the heat pump system is not in the enthalpy increase mode, receiving an action signal for the electronic expansion valve to continue to open.

[0089] Among them, the enthalpy increase mode can be a working mode adopted by the heat pump system to improve energy efficiency, which improves efficiency by increasing the enthalpy value in the cooling or heating cycle.

[0090] In the embodiment of the present disclosure, the received action signal for the electronic expansion valve to be continuously opened may be an action signal for the main electronic expansion valve to be continuously opened.

[0091] Step 202: If the exhaust gas temperature value and the exhaust gas superheat degree both show an increasing trend, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state.

[0092] It can be understood that if the above step 201 is satisfied, when the exhaust temperature value and the exhaust superheat value have an increasing trend, it means that the preset trend is satisfied.

[0093] It should be noted that when the electronic expansion valve is not in the enthalpy increase mode, its regulation performance may be poor. If the electronic expansion valve (main electronic expansion valve) continues to open, the refrigerant flow through the electronic expansion valve (main electronic expansion valve) will increase. Excessive refrigerant flow will cause too much refrigerant in the evaporator, which will not evaporate in time, and then the exhaust temperature and exhaust superheat of the equipment will increase. This situation also indicates that the action of the electronic expansion valve (main electronic expansion valve) is inconsistent with the expected control target, that is, it is in a state of out of step.

[0094] Step 203: If the exhaust gas superheat satisfies a first preset condition, the electronic expansion valve is controlled to perform a first reset action.

[0095] Step 204: If the exhaust gas superheat satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

[0096] It should be noted that the specific implementation of steps 203 and 204 can refer to the above embodiment and will not be described in detail here.

[0097] In the disclosed embodiment, first, when the heat pump system does not start the enthalpy increase mode, it receives an action signal that the opening of the electronic expansion valve is continuously opened. If the exhaust temperature value and the exhaust superheat are both increasing, the preset trend is met, and the electronic expansion valve is judged to be in a state of loss of step. If the exhaust superheat meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action. If the exhaust superheat meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. In this way, the loss of step problem of the electronic expansion valve when the heat pump system does not start the enthalpy increase mode can be accurately identified to avoid system operation disorders caused by loss of step, such as overheating and damage of components. Through the two-stage reset action, the state of the expansion valve can be corrected in time to ensure stable operation of the system, improve system energy efficiency, and reduce maintenance costs.

[0098] Figure 3 It is a flow chart of the electronic expansion valve out-of-step control method provided according to the third embodiment of the present disclosure.

[0099] like Figure 3 As shown, the method includes:

[0100] Step 301: When the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, an action signal of continuously decreasing the opening of the main electronic expansion valve is received.

[0101] Among them, the enthalpy increase mode can be a working mode adopted by the heat pump system to improve energy efficiency, which improves efficiency by increasing the enthalpy value in the cooling or heating cycle.

[0102] Optionally, the electronic expansion valve includes a main electronic expansion valve and an auxiliary electronic expansion valve.

[0103] It should be noted that in the enthalpy increase mode, the main electronic expansion valve can accurately adjust the refrigerant flow to optimize system performance. If the main electronic expansion valve is continuously closed and the auxiliary electronic expansion valve is not activated, the refrigerant flow through the main electronic expansion valve will be significantly reduced.

[0104] Step 302: If the exhaust gas temperature value increases and the exhaust gas superheat decreases, the preset trend is met and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0105] It should be noted that if step 301 is met, the refrigerant in the evaporator will be insufficient and unable to absorb heat effectively, thereby increasing the exhaust temperature of the equipment (because the compressor requires more work to compress less refrigerant) and reducing the exhaust superheat (because the refrigerant temperature at the evaporator outlet is low). In this case, the main electronic expansion valve is out of step, which means that it has not been accurately adjusted according to the requirements of energy efficiency improvement, so it can be determined that the main electronic expansion valve is in an out-of-step state.

[0106] Step 303: If the exhaust gas superheat satisfies a first preset condition, the main electronic expansion valve is controlled to perform a first reset action.

[0107] Step 304: If the exhaust gas superheat satisfies a second preset condition, the main electronic expansion valve is controlled to perform a second reset action.

[0108] In the disclosed embodiment, first, when the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, it receives the action signal of the main electronic expansion valve opening continuously closing. If the exhaust temperature value increases and the exhaust superheat decreases, the preset trend is met, and the main electronic expansion valve is judged to be in a state of out-of-step. If the exhaust superheat satisfies the first preset condition, the main electronic expansion valve is controlled to perform the first reset action. If the exhaust superheat satisfies the second preset condition, the main electronic expansion valve is controlled to perform the second reset action. In this way, the main electronic expansion valve can be accurately judged to be out of step in the enthalpy increase mode, and the system hidden dangers caused by the abnormal opening can be discovered in time to prevent the system performance degradation and component damage caused by out-of-step. Through the two-stage reset action, the system operation can be optimized, the energy efficiency can be improved, and the maintenance frequency and cost can be reduced.

[0109] Figure 4 It is a flow chart of the electronic expansion valve out-of-step control method provided according to the fourth embodiment of the present disclosure.

[0110] like Figure 4 As shown, the method includes:

[0111] Step 401, when the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, a main electronic expansion valve opening continuously opens and an action signal is received.

[0112] Among them, the enthalpy increase mode can be a working mode adopted by the heat pump system to improve energy efficiency, which improves efficiency by increasing the enthalpy value in the cooling or heating cycle.

[0113] Optionally, the electronic expansion valve includes a main electronic expansion valve and an auxiliary electronic expansion valve.

[0114] It should be noted that, in the enthalpy increase mode, if the main electronic expansion valve is continuously opened and the auxiliary electronic expansion valve is not actuated, the refrigerant flow through the main electronic expansion valve will increase significantly.

[0115] Step 402: If the exhaust gas temperature value decreases and the exhaust gas superheat increases, the preset trend is met and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0116] It should be noted that if step 401 is satisfied, there will be too much refrigerant in the evaporator, and part of the refrigerant may not evaporate in time and accumulate in the evaporator. The accumulated refrigerant will reduce the efficiency of the evaporator and may cause the compressor to inhale too much liquid refrigerant, thereby reducing the exhaust temperature of the equipment (because the compressor compresses less refrigerant and the compression work of the liquid refrigerant is low) and increasing the exhaust superheat (because the refrigerant temperature at the evaporator outlet is high and contains more liquid refrigerant), indicating that the action of the main electronic expansion valve is inconsistent with the expected control target, that is, it is in a state of out-of-step.

[0117] Step 403: If the exhaust gas superheat satisfies a first preset condition, the main electronic expansion valve is controlled to perform a first reset action.

[0118] Step 404: If the exhaust gas superheat satisfies a second preset condition, the main electronic expansion valve is controlled to perform a second reset action.

[0119] In the disclosed embodiment, first, when the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, the main electronic expansion valve receives a continuous opening action signal. If the exhaust temperature value decreases and the exhaust superheat increases, the preset trend is met, and the main electronic expansion valve is judged to be in a state of loss of step. If the exhaust superheat meets the first preset condition, the main electronic expansion valve is controlled to perform the first reset action. If the exhaust superheat meets the second preset condition, the main electronic expansion valve is controlled to perform the second reset action. It can effectively ensure the stable operation of the heat pump system, accurately identify the loss of step of the main electronic expansion valve, and avoid system abnormalities caused by loss of step, such as component damage, operating failure, etc. At the same time, through the reset action under different preset conditions, the refrigerant flow rate can be finely adjusted, the system energy efficiency can be improved, and the maintenance cost can be reduced.

[0120] Figure 5 This is a flow chart of the self-diagnosis and reset function of an electronic expansion valve out of step. Figure 5 As shown, first, the exhaust temperature and exhaust superheat are constantly monitored. Then, if the enthalpy increase mode is not turned on and the electronic expansion valve continuous action signal is received, the main electronic expansion valve can be considered to be in a state of out-of-step when the following two conditions are met. 1. The continuous action signal is a continuous closing action signal, and the exhaust temperature and exhaust superheat are both reduced; 2. The continuous action signal is a continuous opening action signal, and the exhaust temperature and exhaust superheat are both increased. Otherwise, it means that the main electronic expansion valve is not in a state of out-of-step.

[0121] If the enthalpy increase mode is turned on, the opening of the auxiliary electronic expansion valve does not change, and the continuous action signal of the main electronic expansion valve is received, the main electronic expansion valve can be considered to be in a state of out-of-step when the following two conditions are met. 1. The continuous action signal is a continuous closing action signal, the exhaust temperature value increases, and the exhaust superheat decreases; 2. The continuous action signal is a continuous opening action signal, the exhaust temperature value decreases, and the exhaust superheat increases. Otherwise, it means that the main electronic expansion valve is not in a state of out-of-step.

[0122] Further, when the main electronic expansion valve is in a state of out-of-step, it is determined whether the exhaust superheat is greater than the reference exhaust superheat. If so, it means that the main electronic expansion valve is seriously out of step, and the first preset condition is met, and then the main electronic expansion valve is controlled to perform the first reset action. If not, it means that the main electronic expansion valve is not seriously out of step, and the second preset condition is met, and then the main electronic expansion valve is controlled to perform the second reset action.

[0123] In order to facilitate better implementation of the electronic expansion valve out-of-step control method disclosed herein, the present disclosure also provides an electronic expansion valve out-of-step control device based on the electronic expansion valve out-of-step control method described above. The meanings of the terms are the same as those in the electronic expansion valve out-of-step control method described above, and the specific implementation details can refer to the description in the method embodiment.

[0124] See also Figure 6 , Figure 6 : is a structural schematic diagram of an electronic expansion valve out-of-step control device provided in an embodiment of the present disclosure, the electronic expansion valve out-of-step control device 600 comprises:

[0125] A receiving module 610, for receiving a continuous action signal of the electronic expansion valve;

[0126] A judgment module 620 is used to judge that the electronic expansion valve is in a step-out state when the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends;

[0127] A first control module 630, configured to control the electronic expansion valve to perform a first reset action if the exhaust gas superheat satisfies a first preset condition;

[0128] The second control module 640 is configured to control the electronic expansion valve to perform a second resetting action if the exhaust gas superheat satisfies a second preset condition.

[0129] Optionally, the receiving module includes:

[0130] A first receiving unit is used to receive an action signal indicating that the opening of the electronic expansion valve is continuously reduced when the heat pump system is not in the enthalpy increase mode;

[0131] The corresponding judgment module includes:

[0132] The first judgment unit is used to judge that the electronic expansion valve is in a state of out-of-step if the variation trends of the exhaust temperature value and the exhaust superheat are both decreasing, and the preset trend is satisfied.

[0133] Optionally, the receiving module includes:

[0134] A second receiving unit is used to receive an action signal indicating that the electronic expansion valve continues to open when the heat pump system is not in the enthalpy increase mode;

[0135] Then, the corresponding judgment module includes:

[0136] The second judgment unit is used to judge that the electronic expansion valve is in a step-out state if the change trends of the exhaust temperature value and the exhaust superheat are both increasing, and the preset trend is satisfied.

[0137] Optionally, the receiving module includes:

[0138] The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve;

[0139] A third receiving unit is used to receive an action signal of continuously decreasing the opening of the main electronic expansion valve when the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change;

[0140] Then, the corresponding judgment module includes:

[0141] The third judgment unit is used to judge that the main electronic expansion valve is in a state of out-of-step if the exhaust temperature value increases and the exhaust superheat decreases, thus satisfying the preset trend.

[0142] Optionally, the receiving module includes:

[0143] The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve;

[0144] A fourth receiving unit is used to receive an action signal of continuously increasing the opening of the main electronic expansion valve when the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change;

[0145] Then, the corresponding judgment module includes:

[0146] The fourth judgment unit is used to judge that the main electronic expansion valve is in a state of out-of-step if the exhaust temperature value decreases and the exhaust superheat increases, thereby satisfying the preset trend.

[0147] Optionally, the first control module is specifically configured to:

[0148] If the exhaust gas superheat is greater than a reference exhaust gas superheat, it is determined that the exhaust gas superheat satisfies a first preset condition;

[0149] Then, the controlling the electronic expansion valve to perform the first resetting action is specifically:

[0150] Controlling the heat pump system to perform a shutdown action;

[0151] The electronic expansion valve is reset according to a preset first reset number.

[0152] Optionally, the second control module is specifically used for:

[0153] If the exhaust gas superheat is less than or equal to the reference exhaust gas superheat, it is determined that the exhaust gas superheat satisfies a second preset condition;

[0154] Then, the controlling the electronic expansion valve to perform the second resetting action is specifically:

[0155] When the compressor frequency of the heat pump system is reduced to the target frequency, the electronic expansion valve is reset according to a preset second reset number of times.

[0156] Optionally, resetting the electronic expansion valve includes:

[0157] Based on the maximum number of steps of the electronic expansion valve, controlling the electronic expansion valve to open to a preset number of steps and close to the preset number of steps in sequence, wherein the preset number of steps is the maximum pulse multiplied by a preset multiple;

[0158] The electronic expansion valve is restored to an initial opening degree.

[0159] In the disclosed embodiment, first, a continuous action signal of the electronic expansion valve opening is received, and then when the trend of changes in the exhaust temperature value and the exhaust superheat meets the preset trend, it is determined that the electronic expansion valve is in a state of loss of step, and then if the exhaust superheat meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust superheat meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving a continuous action signal of the electronic expansion valve opening, the loss of step is determined according to the exhaust temperature, superheat trend and preset conditions, and a reset action is performed to ensure the stability of the heat pump system and improve the operating performance. Avoiding equipment damage and system shutdown caused by the loss of step of the electronic expansion valve can improve the adjustment accuracy, accurately control the refrigerant flow, enhance the system adaptability, and adapt to various working conditions.

[0160] In addition, the present disclosure also provides an electronic device, such as Figure 7 As shown, it shows a schematic diagram of the structure of the electronic device involved in the present disclosure, specifically:

[0161] The electronic device may include components such as a processor 701 with one or more processing cores, a memory 702 with one or more computer-readable storage media, a power supply 703, and an input unit 704. Those skilled in the art will appreciate that Figure 7 The electronic device structure shown in the figure does not constitute a limitation on the electronic device, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0162] The processor 701 is the control center of the electronic device. It uses various interfaces and lines to connect various parts of the entire electronic device. By running or executing software programs and / or modules stored in the memory 702, and calling data stored in the memory 702, it performs various functions of the electronic device and processes data, thereby monitoring the electronic device as a whole. Optionally, the processor 701 may include one or more processing cores; preferably, the processor 701 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 701.

[0163] The memory 702 can be used to store software programs and modules. The processor 701 executes various functional applications and data processing by running the software programs and modules stored in the memory 702. The memory 702 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device, etc. In addition, the memory 702 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Accordingly, the memory 702 may also include a memory controller to provide the processor 701 with access to the memory 702.

[0164] The electronic device also includes a power supply 703 for supplying power to each component. Preferably, the power supply 703 can be logically connected to the processor 701 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. The power supply 703 can also include any components such as one or more DC or AC power supplies, recharging systems, power supply device debugging circuits, power converters or inverters, and power status indicators.

[0165] The electronic device may further include an input unit 704, which may be used to receive input digital or character information and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.

[0166] Although not shown, the electronic device may further include a display unit, etc., which will not be described in detail herein. Specifically in this embodiment, the processor 701 in the electronic device will load the executable files corresponding to the processes of one or more application programs into the memory 702 according to the following instructions, and the processor 701 will run the application programs stored in the memory 702, thereby implementing the steps in any one of the electronic expansion valve out-of-step control methods provided in the embodiments of the present disclosure.

[0167] In the disclosed embodiment, first, a continuous action signal of the electronic expansion valve opening is received, and then when the trend of changes in the exhaust temperature value and the exhaust superheat meets the preset trend, it is determined that the electronic expansion valve is in a state of loss of step, and then if the exhaust superheat meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust superheat meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving a continuous action signal of the electronic expansion valve opening, the loss of step is determined according to the exhaust temperature, superheat trend and preset conditions, and a reset action is performed to ensure the stability of the heat pump system and improve the operating performance. Avoiding equipment damage and system shutdown caused by the loss of step of the electronic expansion valve can improve the adjustment accuracy, accurately control the refrigerant flow, enhance the system adaptability, and adapt to various working conditions.

[0168] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0169] A person of ordinary skill in the art will appreciate that all or part of the steps in the various methods of the above embodiments may be completed by instructions, or by controlling related hardware through instructions. The instructions may be stored in a computer-readable storage medium and loaded and executed by a processor.

[0170] To this end, the present disclosure provides a computer-readable storage medium having a computer program stored thereon. The computer program can be loaded by a processor to execute the steps in any one of the electronic expansion valve out-of-step control methods provided in the present disclosure.

[0171] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0172] The computer-readable storage medium may include: a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0173] Since the instructions stored in the computer-readable storage medium can execute the steps in any one of the electronic expansion valve out-of-step control methods provided in the present disclosure, the beneficial effects that can be achieved by any one of the electronic expansion valve out-of-step control methods provided in the present disclosure can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0174] The above is a detailed introduction to an electronic expansion valve out-of-step control method, device and computer-readable storage medium provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An electronic expansion valve out-of-step control method, applied to a heat pump system, characterized in that: include: Receive the continuous action signal of the electronic expansion valve opening; When the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a step-out state; If the exhaust gas superheat satisfies a first preset condition, controlling the electronic expansion valve to perform a first resetting action; If the exhaust gas superheat satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

2. The method according to claim 1, characterized in that The receiving of the electronic expansion valve opening continuous action signal comprises: When the heat pump system is not in enthalpy increase mode, receiving an action signal indicating that the opening of the electronic expansion valve is continuously reduced; Then, when the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, specifically: If the variation trends of the exhaust temperature value and the exhaust superheat are both decreasing, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state.

3. The method according to claim 1, characterized in that The receiving of the electronic expansion valve opening continuous action signal comprises: When the heat pump system is not in enthalpy increase mode, receiving an action signal indicating that the electronic expansion valve continues to open wide; Then, when the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, specifically: If the variation trends of the exhaust temperature value and the exhaust superheat are both increasing, the preset trend is met, and it is determined that the electronic expansion valve is in a state of out-of-step.

4. The method according to claim 1, characterized in that: The receiving of the electronic expansion valve opening continuous action signal comprises: The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve; When the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, an action signal of continuously decreasing the opening of the main electronic expansion valve is received; Then, when the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, specifically: If the exhaust temperature value increases and the exhaust superheat decreases, the preset trend is met and it is determined that the main electronic expansion valve is in a state of out-of-step.

5. The method according to claim 1, characterized in that The receiving of the continuous action signal of the electronic expansion valve comprises: The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve; When the heat pump system starts the enthalpy increase mode and the opening of the auxiliary electronic expansion valve does not change, an action signal of continuously increasing the opening of the main electronic expansion valve is received; Then, when the variation trends of the exhaust temperature value and the exhaust superheat meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, specifically: If the exhaust gas temperature value decreases and the exhaust gas superheat increases, the preset trend is met and it is determined that the main electronic expansion valve is in a state of out-of-step.

6. The method according to claim 1, characterized in that If the exhaust gas superheat satisfies a first preset condition, controlling the electronic expansion valve to perform a first reset action includes: If the exhaust gas superheat is greater than a reference exhaust gas superheat, it is determined that the exhaust gas superheat satisfies a first preset condition; Then, the controlling the electronic expansion valve to perform the first resetting action is specifically: Controlling the heat pump system to perform a shutdown action; The electronic expansion valve is reset according to a preset first reset number.

7. The method according to claim 1, characterized in that If the exhaust gas superheat satisfies a second preset condition, controlling the electronic expansion valve to perform a second resetting action includes: If the exhaust gas superheat is less than or equal to the reference exhaust gas superheat, it is determined that the exhaust gas superheat satisfies a second preset condition; Then, the controlling the electronic expansion valve to perform the second resetting action is specifically: When the compressor frequency of the heat pump system is reduced to the target frequency, the electronic expansion valve is reset according to a preset second reset number of times.

8. The method according to claim 6 or 7, characterized in that: The resetting of the electronic expansion valve comprises: Based on the maximum number of steps of the electronic expansion valve, controlling the electronic expansion valve to open to a preset number of steps and close to the preset number of steps in sequence, wherein the preset number of steps is the maximum pulse multiplied by a preset multiple; The electronic expansion valve is restored to an initial opening degree.

9. An electronic expansion valve out-of-step control device, characterized in that: include: A receiving module, used for receiving a continuous action signal of the electronic expansion valve; A judgment module, used for judging that the electronic expansion valve is in a step-out state when the variation trends of the exhaust temperature value and the exhaust superheat degree meet the preset trends; A first control module, configured to control the electronic expansion valve to perform a first reset action if the exhaust gas superheat satisfies a first preset condition; The second control module is used to control the electronic expansion valve to perform a second resetting action if the exhaust gas superheat satisfies a second preset condition.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a plurality of instructions, and the instructions are suitable for being loaded by a processor to execute the steps in the method according to any one of claims 1 to 8.

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