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, the low pressure and the high pressure meets the preset trend, it is judged that the electronic expansion valve is in an out-of-step state; if the high pressure meets a first preset condition, the electronic expansion valve is controlled to execute a first reset action; and if the high pressure meets a second preset condition, the electronic expansion valve is controlled to execute a second reset action. Therefore, by monitoring the opening degree of the electronic expansion valve, the exhaust temperature and the high and low pressure, the out-of-step condition can be accurately recognized, and system faults caused by out-of-step are avoided. Two-stage reset actions are executed according to different preset conditions of high pressure, normal work of the expansion valve can be quickly recovered, system stability is maintained, operation efficiency is improved, and maintenance cost is reduced.

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 air-conditioning systems. Due to reasons such as 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 loss of step.

[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 and includes:

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

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

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

[0009] If the high pressure 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 state of out-of-step when the variation trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends;

[0013] A first control module, configured to control the electronic expansion valve to perform a first reset action if the high pressure 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 high pressure meets 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 opening of the electronic expansion valve is received, and then when the changing trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, and then if the high pressure meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high pressure meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. Thus, by monitoring the opening of the electronic expansion valve, the exhaust temperature, and the high and low pressures, the out-of-step condition can be accurately identified to avoid system failures caused by out-of-step. By performing two-stage reset actions according to different preset conditions of the high pressure pressure, the normal operation of the expansion valve can be quickly restored, the system stability can be maintained, the operating efficiency can be improved, and the maintenance cost can be reduced.

[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 This is the functional flow chart of the electronic expansion valve's active identification and reset;

[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 embodiments of the present disclosure, the “heat pump system” will be 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 temperature, the low pressure and the high pressure meet 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, low pressure refers to the pressure on the low pressure side when the refrigeration system is running, that is, the suction pressure or evaporation pressure. It is the gas pressure in the suction chamber of the compressor. In the refrigeration system, low pressure usually exists in the pipeline from the expansion valve outlet to the evaporator and then to the compressor suction port. The measurement of low pressure is usually carried out on the process port of the outdoor unit gas valve, and it is low pressure during refrigeration operation.

[0043] Among them, high pressure refers to the pressure on the high-pressure side when the refrigeration system is running, that is, the exhaust pressure or condensing pressure. It is the pressure at the exhaust port of the compressor. In the refrigeration system, high pressure usually exists in the pipeline from the exhaust port of the compressor to the condenser and then to the inlet of the expansion valve. The measurement of high pressure is also usually carried out on the process port of the outdoor unit valve, but it is high pressure during heating operation.

[0044] It should be noted that the variation trends of the exhaust temperature value, the low pressure and the high pressure satisfying the preset trend may be that the exhaust temperature value decreases, the low pressure increases and the high pressure decreases. In other embodiments, the variation trends of the exhaust temperature value and the exhaust superheat satisfying the preset trend may be that the exhaust temperature value increases, the low pressure decreases and the high pressure increases.

[0045] In other embodiments, the variation trends of the exhaust temperature value and the exhaust superheat degree may satisfy the preset trend, that is, the exhaust temperature value increases, the low pressure increases, and the high pressure decreases. Alternatively, the variation trends of the exhaust temperature value and the exhaust superheat degree may satisfy the preset trend, that is, the exhaust temperature value decreases, the low pressure decreases, and the high pressure increases, which is not limited here.

[0046] For different electronic expansion valve opening continuous action signals, the preset trends that the exhaust temperature value, the low pressure and the high pressure need to meet may be different.

[0047] As an example, when the heat pump system is not in enthalpy increase mode, and receives an action signal that the opening of the electronic expansion valve is continuously closed, when the variation trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends, it is determined that the electronic expansion valve is in a state of out-of-step, specifically;

[0048] If the exhaust temperature value decreases, the low pressure increases, and the high pressure decreases, the preset trend is met and it is determined that the electronic expansion valve is in a state of out-of-step.

[0049] 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.

[0050] Wherein, receiving a signal indicating that the opening of the electronic expansion valve is continuously decreasing indicates that it is monitored that the opening of the electronic expansion valve is continuously decreasing.

[0051] It should be noted that closing the main electronic expansion valve will reduce the refrigerant flow entering the evaporator, causing the refrigerant in the evaporator to evaporate more slowly and absorb less heat, so the exhaust temperature of the compressor will decrease. As the refrigerant flow decreases, the refrigerant pressure in the evaporator (i.e., low pressure) will rise because the refrigerant in the evaporator does not have enough time to evaporate and reduce the pressure. As the refrigerant flow decreases, the refrigerant in the condenser will also decrease, causing the condensing pressure (i.e., high pressure) to drop. It can be judged that the electronic expansion valve may be out of step because the refrigerant flow is not adjusted according to the expected opening.

[0052] Step 103: If the high pressure satisfies a first preset condition, the electronic expansion valve is controlled to perform a first reset action.

[0053] 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.

[0054] 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.

[0055] 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 high pressure satisfies the first preset condition, it means that the electronic expansion valve may be seriously out of step.

[0056] 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.

[0057] Optionally, if the high pressure is greater than the reference high pressure, it is determined that the high pressure satisfies a first preset condition;

[0058] Then, the electronic expansion valve is controlled to perform a first reset action, specifically:

[0059] Control the heat pump system to execute shutdown action;

[0060] The electronic expansion valve is reset according to a preset first reset number.

[0061] 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.

[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 high pressure satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

[0074] Optionally, if the high-pressure pressure is less than or equal to the reference high-pressure pressure, and it is judged that the high-pressure pressure meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action, specifically; when the compressor frequency of the heat pump system is reduced to the target frequency, the electronic expansion valve is reset according to the preset second reset number of times.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] It is understandable that if the compressor frequency of the heat pump system is reduced to the target frequency and the high pressure is less than or equal to the reference high pressure, it means that the overall operating state of the electronic expansion valve is still within an acceptable range, and an attempt can be made to restore the normal operation of the electronic expansion valve through a reset operation.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] In the disclosed embodiment, first, a continuous action signal of the opening of the electronic expansion valve is received, and then when the changing trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, and then if the high pressure meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high pressure meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. Thus, by monitoring the opening of the electronic expansion valve, the exhaust temperature, and the high and low pressures, the out-of-step condition can be accurately identified to avoid system failures caused by out-of-step. By performing two-stage reset actions according to different preset conditions of the high pressure pressure, the normal operation of the expansion valve can be quickly restored, the system stability can be maintained, the operating efficiency can be improved, and the maintenance cost can be reduced.

[0083] 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.

[0084] like Figure 2 As shown, the method includes:

[0085] 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.

[0086] 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.

[0087] 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.

[0088] Step 202: If the exhaust temperature value increases, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is determined that the electronic expansion valve is in a state of out-of-step.

[0089] It should be noted that under normal circumstances, when the electronic expansion valve (here it can be the main electronic expansion valve) receives the action signal of continuously opening the opening, more refrigerant should enter the evaporator. This will increase the evaporation amount in the evaporator, absorb more heat, and thus the low pressure will increase. At the same time, the amount of refrigerant delivered to the condenser after being compressed by the compressor will increase, and the high pressure will also change accordingly, but it is generally within the normal range. The exhaust temperature will be relatively stable or slightly reduced due to the enhanced heat exchange of the evaporator.

[0090] However, if the exhaust temperature value increases, the low pressure decreases, and the high pressure increases, which is contrary to normal expectations, this indicates that although the electronic expansion valve (main electronic expansion valve) receives a signal to continuously increase the opening, it does not actually effectively increase the refrigerant flow rate. It is likely that a loss of step has occurred, causing it to be unable to adjust the opening normally according to the command, thereby causing abnormal changes in system pressure and temperature.

[0091] Step 203: If the high pressure satisfies a first preset condition, the electronic expansion valve is controlled to perform a first reset action.

[0092] Step 204: If the high pressure satisfies a second preset condition, the electronic expansion valve is controlled to perform a second resetting action.

[0093] 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.

[0094] In the disclosed embodiment, first, when the heat pump system does not start the enthalpy increase mode, it receives the action signal of the electronic expansion valve opening continuously opening, and then if the exhaust temperature value increases, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is judged that the electronic expansion valve is in a state of out-of-step, and then if the high pressure meets the first preset condition, the electronic expansion valve is controlled to perform the first reset action, and then if the high pressure meets the second preset condition, the electronic expansion valve is controlled to perform the second reset action. Therefore, when the heat pump system does not start the enthalpy increase mode, the opening of the electronic expansion valve, the exhaust temperature, and the high and low pressures are monitored in real time, the out-of-step condition is accurately identified, and the reset action is performed in stages according to the high pressure, which can quickly restore the normal operation of the expansion valve, ensure system stability, and reduce the probability of failure and maintenance costs.

[0095] 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.

[0096] like Figure 3 As shown, the method includes:

[0097] 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.

[0098] 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.

[0099] Step 302: If the exhaust temperature value increases, the low pressure increases, and the high pressure decreases, the preset trend is met, and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0100] It should be noted that in the enthalpy increase state, the system usually increases the refrigerant flow entering the evaporator to improve the heating efficiency. If the main electronic expansion valve opening is continuously closed at this time, it will cause changes similar to the non-enthalpy increase state, but the exhaust temperature may be more complicated due to the enthalpy increase effect (it may increase or decrease, depending on the combined effect of the enthalpy increase degree and the main electronic expansion valve closing). The low pressure increases and the high pressure decreases, which are similar to the non-enthalpy increase state, but these changes may be more significant or different due to the influence of enthalpy increase. If the observed changes are not as expected and are not caused by other system failures, it may be judged that the main electronic expansion valve is out of step.

[0101] Step 303: If the high pressure satisfies the first preset condition, the main electronic expansion valve is controlled to perform a first reset action.

[0102] Step 304: If the high pressure satisfies the second preset condition, the main electronic expansion valve is controlled to perform a second reset action.

[0103] It should be noted that the specific implementation of steps 303 and 304 can refer to the above embodiment and will not be described in detail here.

[0104] 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 opening continuously closes the action signal, if the exhaust temperature value increases, the low pressure increases and the high pressure decreases, the preset trend is met, and the main electronic expansion valve is judged to be in a state of loss of step, and then if the high pressure meets the first preset condition, the main electronic expansion valve is controlled to perform the first reset action, and then if the high pressure meets the second preset condition, the main electronic expansion valve is controlled to perform the second reset action. Therefore, in the enthalpy increase mode of the heat pump system, this strategy can accurately judge the loss of step by monitoring the opening of the main electronic expansion valve and the exhaust temperature, high and low pressure changes. Performing the reset action in stages according to the high pressure pressure can correct the abnormality in time, ensure the stable operation of the system, avoid failures, improve system performance, and reduce maintenance costs.

[0105] Figure 4It is a flow chart of the electronic expansion valve out-of-step control method provided according to the fourth embodiment of the present disclosure.

[0106] like Figure 4 As shown, the method includes:

[0107] 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 action signal.

[0108] 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.

[0109] Optionally, the electronic expansion valve includes a main electronic expansion valve and an auxiliary electronic expansion valve.

[0110] Step 402: If the exhaust temperature value decreases, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0111] It should be noted that if the electronic expansion valve is in the enthalpy increase mode, the main electronic expansion valve continues to open. In this case, if the main electronic expansion valve continues to open, but the exhaust temperature decreases (this is usually not the expected result of the enthalpy increase state), and the changes in the low pressure and high pressure are opposite to the above analysis (that is, the low pressure decreases and the high pressure increases), then this usually indicates that the control of the main electronic expansion valve does not meet the actual needs of the system. This abnormal change may indicate that the main electronic expansion valve is out of step.

[0112] Step 403: If the high pressure satisfies a first preset condition, the main electronic expansion valve is controlled to perform a first reset action.

[0113] Step 404: If the high pressure satisfies the second preset condition, the main electronic expansion valve is controlled to perform a second reset action.

[0114] It should be noted that the specific implementation of steps 403 and 404 can refer to the above embodiment and will not be described in detail here.

[0115] 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 opening continues to open the action signal, and then if the exhaust temperature value decreases, the low pressure decreases and the high pressure increases, the preset trend is met, and the main electronic expansion valve is judged to be in a state of out of step, and then if the high pressure meets the first preset condition, the main electronic expansion valve is controlled to perform the first reset action, and then if the high pressure meets the second preset condition, the main electronic expansion valve is controlled to perform the second reset action. Thus, when the system is running, the opening of the main electronic expansion valve, the exhaust temperature, and the high and low pressures are monitored in real time. If an abnormal change is captured, it can be accurately determined whether the main electronic expansion valve is out of step. When the out of step is determined, the reset action is performed in stages according to the different preset conditions set by the high pressure pressure. This can not only quickly restore the expansion valve to a normal working state, avoid the refrigerant flow out of control due to out of step, but also maintain the system pressure stability, improve the overall energy efficiency, and reduce energy consumption. At the same time, the number of shutdowns caused by faults is reduced, maintenance costs are reduced, and the service life of the equipment is extended.

[0116] Figure 5 This is the functional flow chart of the active identification and reset of the electronic expansion valve. 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, low pressure and high pressure are monitored at all times. Then, if the enthalpy increase mode is not turned on and the continuous action signal of the 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 decreases, the low pressure increases, and the high pressure decreases; 2. The continuous action signal is a continuous opening action signal, the exhaust temperature value increases, the low pressure decreases, and the high pressure increases. Otherwise, it means that the main electronic expansion valve is not in a state of out-of-step.

[0117] 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 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, the low pressure increases, and the high pressure decreases; 2. The continuous action signal is a continuous opening action signal, the exhaust temperature value decreases, the low pressure decreases, and the high pressure increases. Otherwise, it means that the main electronic expansion valve is not in a state of out-of-step.

[0118] Further, when the main electronic expansion valve is in a state of out-of-step, it is determined whether the high pressure is greater than the reference high pressure. 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 a 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 a second reset action.

[0119] 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.

[0120] 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:

[0121] A receiving module 610, for receiving a continuous action signal of the electronic expansion valve;

[0122] A judgment module 620, configured to judge that the electronic expansion valve is in a step-out state when the variation trends of the exhaust temperature value, the low pressure and the high pressure meet a preset trend;

[0123] A first control module 630, configured to control the electronic expansion valve to perform a first reset action if the high pressure satisfies a first preset condition;

[0124] The second control module 640 is configured to control the electronic expansion valve to perform a second resetting action if the high pressure satisfies a second preset condition.

[0125] Optionally, the receiving module is specifically used to:

[0126] 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;

[0127] Then, the judgment module is specifically used for:

[0128] If the exhaust temperature value decreases, the low pressure increases, and the high pressure decreases, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state.

[0129] Optionally, the receiving module is specifically used to:

[0130] 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;

[0131] Then, the judgment module is specifically used for:

[0132] If the exhaust temperature value increases, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state.

[0133] Optionally, the receiving module is specifically used to:

[0134] The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve;

[0135] 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;

[0136] Then, the judgment module is specifically used for:

[0137] If the exhaust temperature value increases, the low pressure increases, and the high pressure decreases, the preset trend is met, and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0138] Optionally, the receiving module is specifically used to:

[0139] The electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve;

[0140] 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;

[0141] Then, the judgment module is specifically used for:

[0142] If the exhaust temperature value decreases, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is determined that the main electronic expansion valve is in a state of out-of-step.

[0143] Optionally, the first control module 630 is specifically configured to:

[0144] If the high pressure is greater than the reference high pressure, it is determined that the high pressure satisfies a first preset condition;

[0145] Then, the controlling the electronic expansion valve to perform a first resetting action is specifically:

[0146] Controlling the heat pump system to perform a shutdown action;

[0147] The electronic expansion valve is reset according to a preset first reset number.

[0148] Optionally, the second control module 630 is specifically configured to:

[0149] If the high pressure is less than or equal to the reference high pressure, it is determined that the high pressure meets the second preset condition;

[0150] Then, the controlling the electronic expansion valve to perform a second resetting action is specifically:

[0151] When the compressor frequency of the heat pump system is reduced to a target frequency, the electronic expansion valve is reset according to a preset second reset number of times.

[0152] Optionally, resetting the electronic expansion valve includes:

[0153] 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;

[0154] The electronic expansion valve is restored to an initial opening degree.

[0155] In the disclosed embodiment, first, a continuous action signal of the opening of the electronic expansion valve is received, and then when the changing trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, and then if the high pressure meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high pressure meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. Thus, by monitoring the opening of the electronic expansion valve, the exhaust temperature, and the high and low pressures, the out-of-step condition can be accurately identified to avoid system failures caused by out-of-step. By performing two-stage reset actions according to different preset conditions of the high pressure pressure, the normal operation of the expansion valve can be quickly restored, the system stability can be maintained, the operating efficiency can be improved, and the maintenance cost can be reduced.

[0156] 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:

[0157] 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.

[0158] 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.

[0159] 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.

[0160] 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.

[0161] 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.

[0162] 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.

[0163] In the disclosed embodiment, first, a continuous action signal of the opening of the electronic expansion valve is received, and then when the changing trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step, and then if the high pressure meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high pressure meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. Thus, by monitoring the opening of the electronic expansion valve, the exhaust temperature, and the high and low pressures, the out-of-step condition can be accurately identified to avoid system failures caused by out-of-step. By performing two-stage reset actions according to different preset conditions of the high pressure pressure, the normal operation of the expansion valve can be quickly restored, the system stability can be maintained, the operating efficiency can be improved, and the maintenance cost can be reduced.

[0164] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0165] 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.

[0166] 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.

[0167] The specific implementation of the above operations can be found in the previous embodiments, which will not be described in detail here.

[0168] 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.

[0169] 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.

[0170] The above is a detailed introduction to an electronic expansion valve out-of-step control method, device, electronic 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, the low pressure and the high pressure meet the preset trends, it is judged that the electronic expansion valve is in a state of out-of-step; If the high pressure satisfies a first preset condition, controlling the electronic expansion valve to perform a first resetting action; If the high pressure 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, the low pressure and the high pressure 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 decreases, the low pressure increases, and the high pressure decreases, 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, the low pressure and the high pressure 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, the low pressure decreases, and the high pressure increases, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state.

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, the low pressure and the high pressure 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, the low pressure increases, and the high pressure 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, the low pressure and the high pressure 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 decreases, the low pressure decreases, and the high pressure 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 high pressure satisfies a first preset condition, controlling the electronic expansion valve to perform a first reset action includes: If the high pressure is greater than the reference high pressure, it is determined that the high pressure satisfies a first preset condition; Then, the controlling the electronic expansion valve to perform a 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 high pressure satisfies a second preset condition, controlling the electronic expansion valve to perform a second resetting action includes: If the high pressure is less than or equal to the reference high pressure, it is determined that the high pressure meets the second preset condition; Then, the controlling the electronic expansion valve to perform a second resetting action is specifically: When the compressor frequency of the heat pump system is reduced to a 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 state of out-of-step when the variation trends of the exhaust temperature value, the low pressure and the high pressure meet the preset trends; A first control module, configured to control the electronic expansion valve to perform a first reset action if the high pressure 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 high pressure meets 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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