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

Abstract

The embodiment of the present disclosure discloses a kind of electronic expansion valve step-out control method, device and computer readable storage medium, it is related to step-out control technical field, the method comprises: receiving electronic expansion valve opening degree continuous action signal;When the change trend of exhaust temperature value and exhaust superheat degree meets preset trend, it is judged that the electronic expansion valve is in step-out state;If the exhaust superheat degree meets first preset condition, control the electronic expansion valve executes first reset action;If the exhaust superheat degree meets second preset condition, control the electronic expansion valve executes second reset action.Thereby, by receiving electronic expansion valve opening degree signal, according to exhaust temperature, superheat degree trend and preset condition judges step-out, executes reset action, guarantees that heat pump system is stable, improves operating performance.Electronic expansion valve step-out avoids equipment damage, system shutdown, can improve adjustment precision, accurately adjusts refrigerant flow, enhances system adaptability, adapts to various working conditions.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of step-out control, in particular to an electronic expansion valve step-out control method, device and computer readable storage medium. BACKGROUND

[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, system impurity accumulation and other reasons, the rotor may not be completely rotated to the predetermined position of the control pulse given by the controller, thereby causing step-out. For low-temperature air source heat pumps, especially the economizer enthalpy increasing and air supplement system, the control accuracy of the electronic expansion valve of the main circuit is extremely high when the outdoor environment temperature is below-20℃. If step-out occurs during operation, even cumulative step-out, it will lead to system out of control, and further cause large power consumption, low heating energy efficiency, high exhaust temperature, compressor back liquid and other adverse consequences.

[0003] In the related art, the commonly used reset action of the electronic expansion valve is a passive reset control. The reset action of the electronic expansion valve is generally performed only once in the scenarios such as standby, fault shutdown, shutdown and first start of the unit. If the unit is operated for a long time, if there is a long-term cumulative step-out phenomenon, it will cause abnormal operation parameters of the unit and cannot be automatically diagnosed. SUMMARY

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

[0005] In a first aspect, embodiments of the present disclosure provide an electronic expansion valve step-out control method applied to a heat pump system, and the method comprises:

[0006] receiving an electronic expansion valve opening duration action signal;

[0007] when the change trend of the exhaust temperature value and the exhaust superheat degree meets a preset trend, determining that the electronic expansion valve is in a step-out state;

[0008] if the exhaust superheat degree meets a first preset condition, controlling the electronic expansion valve to perform a first reset action;

[0009] if the exhaust superheat degree meets a second preset condition, controlling the electronic expansion valve to perform a second reset action.

[0010] In a second aspect, embodiments of the present disclosure further provide an electronic expansion valve step-out control device, and the device comprises:

[0011] a receiving module configured to receive an electronic expansion valve duration action signal;

[0012] a judging module configured to judge that the electronic expansion valve is in a step-out state when a change trend of the exhaust temperature value and the exhaust superheat degree meets a preset trend;

[0013] a first control module configured to control the electronic expansion valve to perform a first reset action if the exhaust superheat degree meets a first preset condition;

[0014] a second control module configured to control the electronic expansion valve to perform a second reset action if the exhaust superheat degree meets a second preset condition.

[0015] In a third aspect, an electronic device is provided, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program, when executed by the processor, implements the steps in the electronic expansion valve step-out control method described above.

[0016] In a fourth aspect, a computer readable storage medium is provided, which stores a computer program, and the computer program, when executed by a processor, implements the steps in the electronic expansion valve step-out control method described above.

[0017] In a fifth aspect, a computer program product or a computer program is provided, which includes computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions to cause the computer device to perform the method provided in various optional implementations of the embodiments of the present disclosure.

[0018] In the embodiments of the present disclosure, first, an electronic expansion valve opening degree continuous action signal is received, then when a change trend of an exhaust temperature value and an exhaust superheat degree meets a preset trend, it is judged that the electronic expansion valve is in a step-out state, then if the exhaust superheat degree meets a first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust superheat degree meets a second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving the electronic expansion valve opening degree continuous action signal, judging the step-out according to the exhaust temperature, the superheat degree trend and the preset conditions, and performing the reset action, the stability of the heat pump system is ensured, and the operation performance is improved. The step-out of the electronic expansion valve is avoided to cause damage to the equipment and shutdown of the system, the adjustment accuracy is improved, the refrigerant flow is accurately adjusted, the system adaptability is enhanced, and various working conditions are adapted.

[0019] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without any creative effort.

[0021] Figure 1 is a flowchart of an electronic expansion valve step-out control method provided by a first embodiment of the present disclosure;

[0022] Figure 2 is a flowchart of an electronic expansion valve step-out control method provided by a second embodiment of the present disclosure;

[0023] Figure 3 is a flowchart of an electronic expansion valve step-out control method provided by a third embodiment of the present disclosure;

[0024] Figure 4 is a flowchart of an electronic expansion valve step-out control method provided by a fourth embodiment of the present disclosure;

[0025] Figure 5 is a flowchart of an electronic expansion valve step-out self-diagnosis reset function;

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

[0027] Figure 7 is a structural schematic diagram 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 hereinafter, with examples shown in the drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. Various changes, modifications and equivalents of the methods, devices and / or systems described herein will become apparent to those skilled in the art after the understanding of the present disclosure. For example, the order of the operations described herein is merely an example, and is not limited to those set forth herein, but changes can be made, as those skilled in the art will understand after the understanding of the present disclosure, except for the operations that must be performed in a specific order. In addition, the description of features known in the art can be omitted for the sake of clarity and brevity.

[0029] The implementations described in some embodiments of the present disclosure below do not represent all the implementations 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 step-out control method in the embodiment can be an electronic expansion valve step-out control device, which can be configured in any type of electronic device, which is not limited herein.

[0031] In the embodiments of the present disclosure, the electronic expansion valve step-out control method is executed by taking the electronic expansion valve step-out control device as the execution subject, which is not limited herein.

[0032] It should be noted that the sequence of the following embodiments is not limited as the priority order of the embodiments.

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

[0034] As shown in Figure 1 , the method comprises:

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

[0036] In the embodiments of the present disclosure, the electronic expansion valve is a key component in the heat pump unit, which is responsible for adjusting the flow of refrigerant into the evaporator, thereby ensuring the efficient operation of the heat pump system. The electronic expansion valve makes the gaseous refrigerant at medium temperature and high pressure become liquid refrigerant at low temperature and low pressure through throttling, and then the liquid refrigerant absorbs heat in the evaporator to achieve the refrigeration effect. The electronic expansion valve controls the valve flow by the change of superheat degree on the evaporator side, preventing the phenomena of insufficient evaporator area utilization and liquid knock cylinder of the compressor.

[0037] The opening degree continuous action signal indicates that the opening degree of the electronic expansion valve is continuously acting according to a certain change trend, for example, the opening degree is continuously opened or the opening degree is continuously closed, which is not limited herein.

[0038] For example, if the electronic expansion valve opening degree continuous action signal is received, it indicates that the opening degree of the electronic expansion valve is continuously increasing.

[0039] It can be understood that if the heat pump system receives the electronic expansion valve opening degree continuous action signal, 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 electronic expansion valve opening degree continuous action signal can be used as the trigger condition for the subsequent steps.

[0040] Step 102, when the change trend of the exhaust temperature value and the exhaust superheat degree meets the preset trend, determining that the electronic expansion valve is in a step-out state.

[0041] The exhaust temperature can be the temperature of the high-temperature gaseous refrigerant discharged by the compressor after compressing the low-temperature gaseous refrigerant. It is an important parameter in the refrigeration system, directly related to the performance and stability of the system. The exhaust temperature has an important influence on the efficiency and service life of the compressor. High exhaust temperature can cause the refrigerant to overheat inside the compressor, reducing the refrigeration efficiency and increasing the energy consumption. In addition, too high exhaust temperature can also cause the thermal stress of the internal parts of the compressor to increase, shortening the service life of the compressor.

[0042] The exhaust superheat degree can be a measure of the degree to which the temperature of the refrigerant gas discharged by 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 degree can be obtained by subtracting the high-pressure saturation temperature from the exhaust temperature.

[0043] It should be noted that the change trend of the exhaust temperature value and the exhaust superheat degree meeting the preset trend can be that the exhaust temperature value continuously decreases and the exhaust superheat degree continuously decreases. In other embodiments, the change trend of the exhaust temperature value and the exhaust superheat degree meeting the preset trend can be that the exhaust temperature value continuously increases and the exhaust superheat degree continuously increases.

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

[0045] As a possible implementation, when the heat pump system does not start the enthalpy increasing mode, the heat pump system receives the electronic expansion valve opening continuous closing action signal, and 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 a step-out state, specifically: the change trend of the exhaust temperature value and the exhaust superheat degree is reduced, and the preset trend is met, and it is judged that the electronic expansion valve is in a step-out state.

[0046] The enthalpy increasing mode can be a working mode adopted by the heat pump system to improve energy efficiency, by increasing the enthalpy in the refrigeration or heating cycle to improve efficiency.

[0047] Wherein, the electronic expansion valve opening continuous closing signal is received, indicating that the opening of the electronic expansion valve is continuously closing. If the change trend of the exhaust temperature value and the exhaust superheat degree is reduced, it means that the preset trend is met.

[0048] It should be noted that when the electronic expansion valve is not in the enthalpy increasing mode, its regulation of the flow of refrigerant can not be accurate or efficient. If the electronic expansion valve continues to close at this time, the flow of refrigerant through the expansion valve will decrease. The decrease in refrigerant flow will result in insufficient refrigerant in the evaporator, which cannot fully absorb heat, thereby reducing the exhaust temperature and exhaust superheat degree of the device. The electronic expansion valve in this case is out of step, meaning that its action is inconsistent with the expected control target, resulting in a decrease in system performance.

[0049] In step 103, if the exhaust superheat degree meets the first preset condition, the control electronic expansion valve executes the first reset action.

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

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

[0052] Wherein, the first preset condition can be a judgment condition indicating that the electronic expansion valve is in serious out-of-step. If the heat pump system detects that the exhaust superheat degree meets the first preset condition, it means that the electronic expansion valve can be in serious out-of-step.

[0053] Wherein, the first reset action can be a reset action that needs to be executed when the electronic expansion valve is in serious out-of-step.

[0054] As a possible implementation, if the exhaust superheat degree is greater than the reference exhaust superheat degree, the heat pump system determines that the exhaust superheat degree meets the first preset condition, and then can control the electronic expansion valve to execute the first reset action, specifically:

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

[0056] Reset the electronic expansion valve according to a preset first reset number.

[0057] It should be noted that if the heat pump system is in the enthalpy increasing mode, the reset action on the electronic expansion valve can be performed on the main electronic expansion valve, i.e., the main route electronic expansion valve.

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

[0059] The reference exhaust gas superheat degree can be determined according to a conventional exhaust gas superheat degree, such as a conventional exhaust gas superheat degree of 140%. The range of the conventional exhaust gas superheat degree varies with the specific type and operating conditions of the refrigeration system. Generally, in normal refrigeration system operation, the exhaust gas superheat degree is maintained within a relatively stable range.

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

[0061] It should be noted that the ambient temperature, the outlet water temperature, and the exhaust gas superheat degree can be used as three key parameters, respectively as the X, Y, and Z axes, to establish a one-to-one correspondence therebetween. 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 gas superheat degree as the Z axis. The apparatus can determine the corresponding reference exhaust gas superheat degree 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 in serious step-out, it first needs to immediately perform forced shutdown and then perform repair.

[0063] The first reset number can be a preset number of resets that need to be performed when the electronic expansion valve is in serious step-out, such as 2, without being limited thereto.

[0064] Specifically, each time the electronic expansion valve is reset, the following implementation can be adopted.

[0065] Optionally, the electronic expansion valve can be controlled to perform opening to a preset number of steps and closing to a preset number of steps in sequence based on the maximum number of steps of the electronic expansion valve, the preset number of steps being the maximum pulse multiplied by a preset multiple, and then the electronic expansion valve is restored to the initial opening degree.

[0066] The preset multiple can be 1, 2, 3, or any multiple, which can be set according to actual experience, without being limited thereto.

[0067] It should be noted that the maximum pulse of different models of electronic expansion valves can be different, such as 500B and 550B, without being limited thereto.

[0068] The preset number of steps is an action amplitude set according to the maximum pulse. If the preset multiple is 2, it means that the preset number of steps is twice 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, without being limited thereto.

[0069] Specifically, the electronic expansion valve can 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 can be restored to an initial opening degree.

[0070] For example, the electronic expansion valve receives an open action instruction, 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 type of electronic expansion valve is 500B, then in this step, the electronic expansion valve will receive an open action instruction of 1000B (i.e., 2x500B). By performing this step, it can be ensured that the valve core or actuator of the electronic expansion valve can be fully moved, so as to possibly eliminate the out-of-step problem caused by the valve core sticking or actuator failure.

[0071] Then, the electronic expansion valve performs a closing action, and the closing amplitude is 2F(max). The electronic expansion valve receives a closing action instruction, and the closing to the preset number of 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 performing this step, the responsiveness of the electronic expansion valve can be further verified, and an attempt is made to restore its normal working state. After the above opening and closing actions are completed, the electronic expansion valve is adjusted back to a preset initial opening degree. This initial opening degree is usually determined based on system requirements and design characteristics of the electronic expansion valve, and is intended to ensure that the system can run in a relatively stable state when starting. Thus, by restoring to the initial opening degree, it can be ensured that the electronic expansion valve can start working in a suitable state when starting, thereby helping to stabilize the system and improve energy efficiency.

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

[0073] In step 104, if the exhaust gas superheat degree satisfies the second preset condition, the electronic expansion valve is controlled to perform a second reset action.

[0074] Optionally, if the exhaust gas superheat degree is less than or equal to the reference exhaust gas superheat degree, it is judged that the exhaust gas superheat degree 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.

[0076] It should be noted that if the heat pump system is in the enthalpy boost mode, the electronic expansion valve can be reset when the main electronic expansion valve is reset.

[0077] The second preset condition can be a judgment condition indicating that the electronic expansion valve is not in a serious step-out.

[0078] The second reset action can be a reset action that needs to be performed when the electronic expansion valve is not in a serious step-out.

[0079] The target frequency can be a compressor frequency range that the device should maintain during normal operation, or can also be a specific frequency value, which is not limited here.

[0080] It should be noted that in the refrigeration or heating cycle, especially in a low-temperature and high-humidity environment, the evaporator surface of the heat pump system can be frosted. Frosting can affect heat exchange efficiency, so the heat pump system will periodically defrost to restore the performance of the heat exchanger. Generally, the compressor frequency of the heat pump system needs to be reduced during defrosting.

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

[0082] The second reset number can be a preset number of resets that need to be performed when the electronic expansion valve is not in a serious step-out, such as 1, which is not limited here.

[0083] It can be understood that by resetting the electronic expansion valve in a non-serious step-out state in a timely manner, the decline in refrigeration / heating capacity and energy efficiency loss caused by valve step-out 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 of resetting the electronic expansion valve can refer to the above step 103, which will not be repeated here.

[0085] In the embodiments of the present disclosure, first, the continuous opening signal of the electronic expansion valve opening degree is received, then 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 a step-out state, then if the exhaust superheat degree meets the first preset condition, the electronic expansion valve is controlled to perform the first reset action, and finally if the exhaust superheat degree meets the second preset condition, the electronic expansion valve is controlled to perform the second reset action. By receiving the continuous opening signal of the electronic expansion valve opening degree, the step-out state is judged according to the exhaust temperature, the superheat trend and the preset condition, and the reset action is performed to ensure the stability of the heat pump system and improve the operating performance. Avoiding the damage of the equipment and the shutdown of the system caused by the step-out of the electronic expansion valve, the adjustment accuracy can be improved, the refrigerant flow can be accurately adjusted, the system adaptability can be enhanced, and various working conditions can be adapted.

[0086] Figure 2 FIG. 1 is a flow diagram of an electronic expansion valve step-out control method according to a second embodiment of the present disclosure.

[0087] As shown in FIG. 1, the method comprises the following steps. Figure 2

[0088] Step 201, receiving the continuous opening signal of the electronic expansion valve opening degree when the heat pump system does not start the enthalpy increasing mode.

[0089] The enthalpy increasing mode can be a working mode adopted by the heat pump system to improve energy efficiency, and the efficiency is improved by increasing the enthalpy in the refrigeration or heating cycle.

[0090] In the embodiments of the present disclosure, the continuous opening signal of the electronic expansion valve opening degree can be the continuous opening signal of the main electronic expansion valve opening degree.

[0091] Step 202, if the change trend of the exhaust temperature value and the exhaust superheat degree are both rising, the preset trend is met, and it is judged that the electronic expansion valve is in a step-out state.

[0092] It can be understood that if the step 201 is met, when the change trend of the exhaust temperature value and the exhaust superheat degree are both rising, it means that the preset trend is met.

[0093] It should be noted that when the electronic expansion valve is not in the enthalpy increasing mode, its adjustment performance can be poor. If the electronic expansion valve (main electronic expansion valve) is continuously opened, the refrigerant flow through the electronic expansion valve (main electronic expansion valve) will increase. Too much refrigerant flow will cause too much refrigerant in the evaporator, which cannot be evaporated in time, and thus the exhaust temperature and the exhaust superheat degree of the equipment will rise. This situation also indicates that the action of the electronic expansion valve (main electronic expansion valve) is inconsistent with the expected control target, i.e. it is in a step-out state.

[0094] Step 203, if the exhaust superheat degree meets the first preset condition, the electronic expansion valve is controlled to perform the first reset action.​

[0095] Step 204, if the exhaust gas superheat degree meets the second preset condition, the control electronic expansion valve executes the second reset action.

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

[0097] In the embodiments of the present disclosure, first, when the heat pump system does not start the enthalpy increasing mode, the electronic expansion valve opening degree continuous opening action signal is received, then if the exhaust gas temperature value and the exhaust gas superheat degree change trend are both rising, the preset trend is met, it is judged that the electronic expansion valve is in the step-out state, if the exhaust gas superheat degree meets the first preset condition, the electronic expansion valve executes the first reset action, if the exhaust gas superheat degree meets the second preset condition, the electronic expansion valve executes the second reset action. Therefore, the step-out problem of the electronic expansion valve when the heat pump system does not start the enthalpy increasing mode can be accurately identified, and the system running disorder caused by step-out, such as component overheating damage, can be avoided. Through two-stage reset action, the expansion valve state can be corrected in time, the stable operation of the system is ensured, the system efficiency is improved, and the maintenance cost is reduced.

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

[0099] As shown in Figure 3 , the method comprises:

[0100] Step 301, when the heat pump system starts the enthalpy increasing mode and the auxiliary electronic expansion valve opening degree has no change, the main electronic expansion valve opening degree continuous closing action signal is received.

[0101] Wherein, the enthalpy increasing mode can be a working mode adopted by the heat pump system to improve the energy efficiency, and the efficiency is improved by increasing the enthalpy value in the refrigeration or heating cycle.

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

[0103] It should be noted that in the enthalpy increasing mode, the main electronic expansion valve can accurately adjust the flow of refrigerant to optimize the system performance. If the main electronic expansion valve continuously closes at this time and the auxiliary electronic expansion valve does not act, the refrigerant flow through the main electronic expansion valve will be significantly reduced.

[0104] Step 302, if the exhaust gas temperature value rises and the exhaust gas superheat degree decreases, the preset trend is met, and it is judged that the main electronic expansion valve is in the step-out state.

[0105] It should be noted that if step 301 is met, it will result in insufficient refrigerant in the evaporator, which cannot effectively absorb heat, thereby causing the exhaust temperature of the device to rise (because the compressor needs more work to compress less refrigerant) and the exhaust superheat to decrease (because the refrigerant temperature at the outlet of the evaporator is lower). The main electronic expansion valve is out of step in this case, meaning it fails to accurately adjust as required for energy efficiency improvement, so it can be judged that the main electronic expansion valve is in an out-of-step state.

[0106] Step 303, if the exhaust superheat meets the first preset condition, control the main electronic expansion valve to perform a first reset action.

[0107] Step 304, if the exhaust superheat meets the second preset condition, control the main electronic expansion valve to perform a second reset action.

[0108] In the embodiments of the present disclosure, first, when the heat pump system opens the enthalpy increasing mode, the auxiliary electronic expansion valve opening degree does not change, and the main electronic expansion valve opening degree continuous opening action signal is received, then if the exhaust temperature value increases and the exhaust superheat decreases, the preset trend is met, it is judged that the main electronic expansion valve is in an out-of-step state, then if the exhaust superheat meets the first preset condition, the main electronic expansion valve is controlled to perform a first reset action, then if the exhaust superheat meets the second preset condition, the main electronic expansion valve is controlled to perform a second reset action. Thus, the main electronic expansion valve can be accurately judged to be out of step in the enthalpy increasing mode, and the system hidden danger caused by abnormal opening degree can be found in time to prevent system performance degradation and component damage caused by out-of-step. Through two-stage reset action, system operation can also be optimized, energy efficiency can be improved, and maintenance frequency and cost can be reduced.

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

[0110] As shown in Figure 4 , the method comprises:

[0111] Step 401, when the heat pump system opens the enthalpy increasing mode, the auxiliary electronic expansion valve opening degree does not change, and the main electronic expansion valve opening degree continuous opening action signal is received.

[0112] Wherein, the enthalpy increasing mode can be a working mode adopted by the heat pump system to improve energy efficiency, and the efficiency is improved by increasing the enthalpy in the refrigeration or heating cycle.

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

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

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

[0116] It should be noted that if step 401 is met, too much refrigerant in the evaporator 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 suck too much liquid refrigerant, thereby reducing the exhaust temperature of the device (because the compressor compresses less refrigerant and the compression work of the liquid refrigerant is lower) and increasing the exhaust superheat (because the refrigerant temperature at the outlet of the evaporator is higher and contains more liquid refrigerant), indicating that the action of the main electronic expansion valve is inconsistent with the expected control target, i.e. in a step-out state.

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

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

[0119] In the embodiments of the present disclosure, first, when the heat pump system starts the enthalpy increasing mode, the auxiliary electronic expansion valve opening degree does not change, and the main electronic expansion valve opening degree continuous opening action signal is received, then if the exhaust temperature value decreases and the exhaust superheat increases, the preset trend is met, it is judged that the main electronic expansion valve is in a step-out state, then if the exhaust superheat meets the first preset condition, the main electronic expansion valve is controlled to perform a first reset action, then if the exhaust superheat meets the second preset condition, the main electronic expansion valve is controlled to perform a second reset action. It can effectively guarantee the stable operation of the heat pump system, accurately identify the step-out condition of the main electronic expansion valve, avoid system abnormalities caused by step-out, such as component damage, operation failure, etc. At the same time, through the reset action under different preset conditions, fine adjustment of the refrigerant flow is realized, the system energy efficiency is improved, and the maintenance cost is reduced.

[0120] Figure 5 It is a flow chart of an electronic expansion valve step-out self-diagnosis reset function, as shown in Figure 5 The exhaust temperature value and the exhaust superheat are first monitored. Then if the enthalpy increasing mode is not started and the electronic expansion valve continuous action signal is received, the main electronic expansion valve is considered to be in a step-out state when the following two conditions are met. 1, the continuous action signal is a continuous closing action signal, and the exhaust temperature value and the exhaust superheat both decrease; 2, the continuous action signal is a continuous opening action signal, and the exhaust temperature value and the exhaust superheat both increase. Otherwise, it is indicated that the main electronic expansion valve is not in a step-out state.

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

[0122] Further, in the case that the main electronic expansion valve is in a step-out state, it is judged whether the exhaust superheat is greater than the reference exhaust superheat. If yes, it indicates that the main electronic expansion valve is seriously step-out, the first preset condition is met, and then the main electronic expansion valve is controlled to perform the first reset action. If no, it indicates that the main electronic expansion valve is not seriously step-out, 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 better implement the electronic expansion valve step-out control method of the present disclosure, the present disclosure further provides an electronic expansion valve step-out control device based on the above-mentioned electronic expansion valve step-out control method. The meanings of the terms are the same as in the above-mentioned electronic expansion valve step-out control method, and the specific implementation details can be referred to the description in the method embodiment.

[0124] Please refer to Figure 6 , Figure 6 is a structural schematic diagram of an electronic expansion valve step-out control device provided by an embodiment of the present disclosure. The electronic expansion valve step-out control device 600 comprises:

[0125] The receiving module 610 is configured to receive an electronic expansion valve continuous action signal.

[0126] The judging module 620 is configured to judge that the electronic expansion valve is in a step-out state when the change trend of the exhaust temperature value and the exhaust superheat meets a preset trend.

[0127] The first control module 630 is configured to control the electronic expansion valve to perform a first reset action if the exhaust superheat meets a first preset condition.

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

[0129] Optionally, the receiving module comprises:

[0130] The first receiving unit is configured to receive an electronic expansion valve opening degree continuous small action signal when the heat pump system does not start the enthalpy increasing mode.

[0131] The corresponding judging module comprises:

[0132] The first judging unit is configured to determine that the electronic expansion valve is in a step-out state if the exhaust temperature value and the change trend of the exhaust superheat degree both decrease.

[0133] Optionally, the receiving module comprises:

[0134] The second receiving unit is configured to receive an electronic expansion valve opening degree continuously increasing action signal when the heat pump system does not start the enthalpy increasing mode.

[0135] The corresponding judging module comprises:

[0136] The second judging unit is configured to determine that the electronic expansion valve is in a step-out state if the exhaust temperature value and the change trend of the exhaust superheat degree both increase.

[0137] Optionally, the receiving module comprises:

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

[0139] The third receiving unit is configured to receive a main electronic expansion valve opening degree continuously decreasing action signal when the heat pump system starts the enthalpy increasing mode and the auxiliary electronic expansion valve opening degree does not change.

[0140] The corresponding judging module comprises:

[0141] The third judging unit is configured to determine that the main electronic expansion valve is in a step-out state if the exhaust temperature value increases and the exhaust superheat degree decreases.

[0142] Optionally, the receiving module comprises:

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

[0144] The fourth receiving unit is configured to receive a main electronic expansion valve opening degree continuously increasing action signal when the heat pump system starts the enthalpy increasing mode and the auxiliary electronic expansion valve opening degree does not change.

[0145] The corresponding judging module comprises:

[0146] The fourth judging unit is configured to determine that the main electronic expansion valve is in a step-out state if the exhaust temperature value decreases and the exhaust superheat degree increases.

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

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

[0149] If so, the control controls the electronic expansion valve to perform a first reset action, specifically:

[0150] The control controls the heat pump system to perform a shutdown action.

[0151] According to a preset first reset number, the control resets the electronic expansion valve.

[0152] Optionally, a second control module, specifically configured to:

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

[0154] If so, the control controls the electronic expansion valve to perform a second reset action, specifically:

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

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

[0157] Based on the maximum step number of the electronic expansion valve, the control controls the electronic expansion valve to perform opening to a preset step number and closing to the preset step number in sequence, and the preset step number is the maximum pulse multiplied by a preset multiple.

[0158] The control restores the electronic expansion valve to an initial opening degree.

[0159] In the embodiments of the present disclosure, first, an electronic expansion valve opening degree continuous action signal is received, then when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets a preset trend, it is determined that the electronic expansion valve is in a step loss state, then if the exhaust gas superheat degree meets a first preset condition, the control controls the electronic expansion valve to perform a first reset action, and finally if the exhaust gas superheat degree meets a second preset condition, the control controls the electronic expansion valve to perform a second reset action. By receiving the electronic expansion valve opening degree continuous action signal, judging the step loss according to the exhaust gas temperature, superheat degree trend and preset condition, and performing the reset action, the stability of the heat pump system is ensured, and the operation performance is improved. Avoiding the step loss of the electronic expansion valve to damage the equipment and stop the system, the adjustment accuracy can be improved, the refrigerant flow can be accurately adjusted, the system adaptability can be enhanced, and various working conditions can be adapted.

[0160] In addition, the present disclosure also provides an electronic device, as shown in Figure 7 The structure schematic diagram of the electronic device related to the present disclosure is shown, specifically:

[0161] The electronic device can include a processor 701 having one or more processing cores, a memory 702 having one or more computer-readable storage media, a power supply 703, and an input unit 704, etc. Those skilled in the art can understand that Figure 7 The electronic device structure shown in the figure is not a limitation on the electronic device, and can include more or fewer components than shown, or combine certain components, or different component arrangements. Among them:

[0162] The processor 701 is the control center of the electronic device, which connects various parts of the entire electronic device through various interfaces and lines, and performs various functions of the electronic device and processes data by running or executing software programs and / or modules stored in the memory 702, and calling data stored in the memory 702, thereby overall monitoring the electronic device. Optionally, the processor 701 can include one or more processing cores; preferably, the processor 701 can integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application program, etc., and the modem processor mainly processes wireless communication. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 701.

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

[0164] The electronic device also includes a power supply 703 for powering various components, and preferably the power supply 703 can be logically connected to the processor 701 through a power management system, so as to realize the functions of managing charging, discharging, and power consumption management, etc. through the power management system. The power supply 703 can also include one or more direct or alternating current power supplies, recharging systems, power supply device debugging circuits, power supply converters or inverters, power supply state indicators, etc. any components.

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

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

[0167] In the embodiments of the present disclosure, first, an electronic expansion valve opening degree continuous action signal is received, then when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets the preset trend, it is judged that the electronic expansion valve is in a step-out state, then if the exhaust gas superheat degree meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action, and finally if the exhaust gas superheat degree meets the second preset condition, the electronic expansion valve is controlled to perform a second reset action. By receiving the electronic expansion valve opening degree continuous action signal, judging the step-out according to the exhaust gas temperature, superheat degree trend and preset condition, and performing the reset action, the stability of the heat pump system is ensured, and the operating performance is improved. Avoiding the damage of the equipment and the shutdown of the system caused by the step-out of the electronic expansion valve, the adjustment accuracy can be improved, the refrigerant flow can be accurately adjusted, the system adaptability can be enhanced, and various working conditions can be adapted.

[0168] The specific implementation of each of the above operations can be referred to the previous embodiments, which will not be described here.

[0169] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions, or by related hardware controlled by the instructions, which can 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, which stores a computer program capable of being loaded by a processor to execute the steps in any of the electronic expansion valve step-out control methods provided by the present disclosure.

[0171] The specific implementation of each of the above operations can be referred to the previous embodiments, which will not be described here.

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

[0173] Due to the instructions stored in the computer readable storage medium, the steps in any one of the electronic expansion valve step-out control methods provided by the present disclosure can be performed, thus the beneficial effects that can be achieved by any one of the electronic expansion valve step-out control methods provided by the present disclosure can be achieved, which are described in detail in the foregoing embodiments and will not be described here.

[0174] The above describes in detail the electronic expansion valve step-out control method, device and computer readable storage medium provided by the present disclosure, and the principles and implementation manners of the present disclosure are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present disclosure and its core idea. Meanwhile, for those skilled in the art, according to the idea of the present disclosure, the specific implementation manners and application ranges will be changed, and the above description of the present disclosure should not be understood as a limitation of the present disclosure.

Claims

1. A method for out-of-step control of an electronic expansion valve applied to a heat pump system, characterized by, The method comprises the following steps: receiving an electronic expansion valve opening degree continuous action signal; when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets a preset trend, it is determined that the electronic expansion valve is in a step-out state; if the exhaust gas superheat degree meets a first preset condition, a first reset action of the electronic expansion valve is controlled; if the exhaust gas superheat degree meets a second preset condition, a second reset action of the electronic expansion valve is controlled; the receiving of the electronic expansion valve opening degree continuous action signal comprises: when the heat pump system does not start the enthalpy increasing mode, an electronic expansion valve opening degree continuous closing action signal is received; then, when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets a preset trend, it is determined that the electronic expansion valve is in a step-out state, specifically: if the change trend of the exhaust gas temperature value and the exhaust gas superheat degree is both decreasing, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state; the receiving of the electronic expansion valve opening degree continuous action signal comprises: when the heat pump system does not start the enthalpy increasing mode, an electronic expansion valve opening degree continuous opening action signal is received; then, when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets a preset trend, it is determined that the electronic expansion valve is in a step-out state, specifically: if the change trend of the exhaust gas temperature value and the exhaust gas superheat degree is both increasing, the preset trend is met, and it is determined that the electronic expansion valve is in a step-out state; if the exhaust gas superheat degree is greater than a reference exhaust gas superheat degree, it is determined that the exhaust gas superheat degree meets the first preset condition; then, the first reset action of the electronic expansion valve is controlled, specifically: the heat pump system is controlled to perform a shutdown action; and the electronic expansion valve is reset according to a preset first reset number of times; if the exhaust gas superheat degree is less than or equal to the reference exhaust gas superheat degree, it is determined that the exhaust gas superheat degree meets the second preset condition; then, the second reset action of the electronic expansion valve is controlled, 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. the receiving of the electronic expansion valve opening degree continuous action signal comprises:

2. The method of claim 1, wherein, the electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve; when the heat pump system starts the enthalpy increasing mode and the opening degree of the auxiliary electronic expansion valve does not change, a main electronic expansion valve opening degree continuous closing action signal is received; then, when the change trend of the exhaust gas temperature value and the exhaust gas superheat degree meets a preset trend, it is determined that the electronic expansion valve is in a step-out state, specifically: if the exhaust gas temperature value increases and the exhaust gas superheat degree decreases, the preset trend is met, and it is determined that the main electronic expansion valve is in a step-out state. the receiving of the electronic expansion valve opening degree continuous action signal comprises:

3. The method of claim 1, wherein, the electronic expansion valve comprises a main electronic expansion valve and an auxiliary electronic expansion valve; ​ when the heat pump system opens the enthalpy increasing mode, the auxiliary electronic expansion valve opening degree has no change, and a main electronic expansion valve opening degree continuously opening action signal is received; then, the electronic expansion valve is determined to be in a step-out state when a change trend of the exhaust temperature value and the exhaust superheat degree meets a preset trend, and specifically, if the exhaust temperature value decreases and the exhaust superheat degree increases, the preset trend is met, and the main electronic expansion valve is determined to be in a step-out state.

4. The method of claim 1, wherein, the resetting of the electronic expansion valve comprises: based on the maximum step number of the electronic expansion valve, the electronic expansion valve is controlled to successively perform opening to a preset step number and closing to the preset step number, and the preset step number is a maximum pulse multiplied by a preset multiple; the electronic expansion valve is restored to an initial opening degree.

5. An electronic expansion valve step-out control device, applied to a heat pump system, characterized in that, comprise: a receiving module configured to receive an electronic expansion valve continuous action signal; a determining module configured to determine that the electronic expansion valve is in a step-out state when a change trend of an exhaust temperature value and an exhaust superheat degree meets a preset trend; a first control module configured to control the electronic expansion valve to perform a first resetting action if the exhaust superheat degree meets a first preset condition; a second control module configured to control the electronic expansion valve to perform a second resetting action if the exhaust superheat degree meets a second preset condition; the receiving module is specifically configured to receive an electronic expansion valve opening degree continuously closing action signal when the heat pump system does not open the enthalpy increasing mode, and then the determining module is specifically configured to determine that the electronic expansion valve is in a step-out state if change trends of the exhaust temperature value and the exhaust superheat degree are both decreasing and the preset trend is met; the receiving module is specifically configured to receive an electronic expansion valve opening degree continuously opening action signal when the heat pump system does not open the enthalpy increasing mode, and then the determining module is specifically configured to determine that the electronic expansion valve is in a step-out state if change trends of the exhaust temperature value and the exhaust superheat degree are both increasing and the preset trend is met; the first control module is specifically configured to determine that the exhaust superheat degree meets the first preset condition if the exhaust superheat degree is greater than a reference exhaust superheat degree, and then the control of the electronic expansion valve to perform the first resetting action is specifically control of the heat pump system to perform a shutdown action and resetting of the electronic expansion valve according to a preset first resetting number; the second control module is specifically configured to determine that the exhaust superheat degree meets the second preset condition if the exhaust superheat degree is less than or equal to the reference exhaust superheat degree, and then the control of the electronic expansion valve to perform the second resetting action is specifically resetting of the electronic expansion valve according to a preset second resetting number when a compressor frequency of the heat pump system is reduced to a target frequency.

6. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a plurality of instructions, which are suitable for being loaded by a processor to execute the steps in the method of any one of claims 1-4.

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