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

Abstract

The embodiment of the disclosure discloses an electronic expansion valve step-out control method and device and a computer readable storage medium, relates to the technical field of step-out control, and the method comprises the following steps: receiving an electronic expansion valve opening degree continuous action signal; 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 a step-out state; if the high pressure meets the first preset condition, the electronic expansion valve is controlled to execute the first reset action; if the high pressure meets the second preset condition, the electronic expansion valve is controlled to execute the second reset action. Therefore, by monitoring the electronic expansion valve opening degree and the exhaust temperature, the high and low pressures, the step-out condition can be accurately identified, and system failure caused by step-out can be avoided. According to different preset conditions of the high pressure, two-stage reset actions are executed, the expansion valve can quickly return to normal work, the system stability can be maintained, the operation efficiency can be improved, and the maintenance cost can be reduced.

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 an air conditioning system. Due to reasons such as motor control speed, load torque, rotor inertia, and system impurity accumulation, the rotor may not be completely rotated to the predetermined position of the control pulse given by the controller, thereby causing step-out.

[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 scenarios such as standby, fault shutdown, shutdown, and first start of the unit. If the unit is running for a long time, and if there is a long-term accumulated step-out phenomenon, the unit operating parameters may be abnormal, and automatic diagnosis may be impossible. 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 partially solve one of the technical problems in the related art.

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

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

[0007] when the change trends of the exhaust gas temperature value, the low pressure, and the high pressure meet preset trends, determining that the electronic expansion valve is in a step-out state;

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

[0009] if the high pressure 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, which includes:

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

[0012] a determining module configured to, when the change trends of the exhaust gas temperature value, the low pressure, and the high pressure meet preset trends, determine that the electronic expansion valve is in a step-out state;

[0013] The first control module is configured to control the electronic expansion valve to perform a first reset action if the high-pressure pressure meets a first preset condition.

[0014] The second control module is configured to control the electronic expansion valve to perform a second reset action if the high-pressure pressure meets a second preset condition.

[0015] In a third aspect, the embodiments of the present disclosure further provide an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is executed by the processor to implement the steps in the electronic expansion valve step-out control method.

[0016] In a fourth aspect, the embodiments of the present disclosure further provide a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps in the electronic expansion valve step-out control method.

[0017] In a fifth aspect, the embodiments of the present disclosure further provide a computer program product or a computer program, which comprises 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 enable the computer device to perform the method provided in various optional implementation manners of the embodiments of the present disclosure.

[0018] In the embodiments of the present disclosure, first, a signal of an electronic expansion valve opening degree continuous action is received, then when the change trend of the exhaust temperature value, the low-pressure pressure and the high-pressure pressure meets a preset trend, it is determined that the electronic expansion valve is in a step-out state, then if the high-pressure pressure meets a first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high-pressure pressure meets a second preset condition, the electronic expansion valve is controlled to perform a second reset action. In this way, by monitoring the electronic expansion valve opening degree and the exhaust temperature, the low-pressure pressure and the high-pressure pressure, the step-out condition can be accurately identified, and system failure caused by step-out can be avoided. According to different preset conditions of the high-pressure pressure, two-stage reset actions are performed, the expansion valve can be quickly restored to normal operation, the system stability can be maintained, the operation efficiency can be improved, and the maintenance cost can be reduced.

[0019] It should be understood that the general description above and the detailed description below 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 in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[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 functional flowchart of an electronic expansion valve actively identifying reset;

[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 herein with reference to the drawings, in which the examples are shown. 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 a study of the following description. For instance, the order of the operations described herein is merely an example, and is not intended to be limiting, as changes can be made to the order of the operations, except where the order of the operations must be performed as described, as will become apparent after a study of the present disclosure. Additionally, the description of features known in the art can be omitted in the interest of brevity and conciseness.

[0029] The implementations described in some embodiments of the present disclosure below do not represent all implementations consistent with the present disclosure. Instead, they are merely examples of apparatuses 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 of the present embodiment can be an electronic expansion valve step-out control device, which can be configured in any type of electronic device, and is not limited herein.

[0031] In the embodiments of the present disclosure, the electronic expansion valve step-out control method will be executed by a heat pump system as the execution subject, and the present disclosure is not limited thereto.

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

[0034] As shown in FIG. 1, the method comprises the following steps. Figure 1

[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 high-temperature and high-pressure gaseous refrigerant become low-temperature and low-pressure liquid refrigerant 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 superheat change on the evaporator side to prevent the phenomenon 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, the low pressure and the high pressure 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 and is 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 increase the thermal stress of the internal components of the compressor, shortening the service life of the compressor.

[0042] The low-pressure pressure refers to the pressure on the low-pressure side of the refrigeration system during operation, that is, the suction pressure or evaporation pressure. It is the gas pressure in the suction chamber of the compressor. In the refrigeration system, the low-pressure pressure usually exists in the pipeline from the outlet of the expansion valve to the evaporator and then to the suction port of the compressor. The measurement of the low-pressure pressure is usually carried out on the process port of the outdoor unit gas valve, and the low-pressure pressure is obtained during refrigeration operation.

[0043] The high-pressure pressure refers to the pressure on the high-pressure side of the refrigeration system during operation, that is, the exhaust pressure or condensation pressure. It is the pressure at the exhaust port of the compressor. In the refrigeration system, the high-pressure 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 the high-pressure pressure is also usually carried out on the process port of the outdoor unit gas valve, but the high-pressure pressure is obtained during heating operation.

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

[0045] In other embodiments, the change trend of the exhaust temperature value and the exhaust superheat satisfying the preset trend can also be that the exhaust temperature value increases, the low-pressure pressure increases and the high-pressure pressure decreases. Alternatively, the change trend of the exhaust temperature value and the exhaust superheat satisfying the preset trend can also be that the exhaust temperature value decreases, the low-pressure pressure decreases and the high-pressure pressure increases, which is not limited herein.

[0046] For different opening continuous action signals of the electronic expansion valve, the preset trend that the exhaust temperature value, the low-pressure pressure and the high-pressure pressure need to satisfy can be different.

[0047] As an example, when the heat pump system does not start the enthalpy increasing mode, the electronic expansion valve opening continuous small action signal is received, and when the change trend of the exhaust temperature value, the low-pressure pressure and the high-pressure pressure satisfies the preset trend, it is judged that the electronic expansion valve is in a step-out state, specifically;

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

[0049] 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.

[0050] The electronic expansion valve opening degree continues to decrease, indicating that the opening degree of the electronic expansion valve is continuously decreasing.

[0051] It should be noted that the decrease of the opening degree of the main electronic expansion valve reduces the refrigerant flow into the evaporator, slows down the evaporation of the refrigerant in the evaporator, and reduces the heat absorbed, so the exhaust temperature of the compressor decreases. Due to the decrease of the refrigerant flow, the pressure of the refrigerant in the evaporator (i.e. the low-pressure pressure) increases because the refrigerant in the evaporator does not have enough time to evaporate and reduce the pressure. With the decrease of the refrigerant flow, the refrigerant in the condenser also decreases, resulting in a decrease in the condensing pressure (i.e. the high-pressure pressure), which can be judged that the electronic expansion valve may be out of step because it does not adjust the refrigerant flow according to the expected opening degree.

[0052] Step 103, if the high-pressure pressure meets the first preset condition, the electronic expansion valve is controlled to perform a first reset action.

[0053] The step-out state of the electronic expansion valve can be divided into serious step-out or non-serious step-out, which is not limited here.

[0054] It should be noted that the effects of serious step-out and non-serious step-out are different, so different step-out control methods can be used, i.e. the heat pump system can use different preset actions for step-out control.

[0055] The first preset condition can be a judgment condition indicating that the electronic expansion valve is in a serious step-out state. If the heat pump system detects that the high-pressure pressure meets the first preset condition, it means that the electronic expansion valve can be in a serious step-out state.

[0056] The first reset action can be a reset action that needs to be performed when the electronic expansion valve is in a serious step-out state.

[0057] Optionally, if the high-pressure pressure is greater than the reference high-pressure pressure, it is judged that the high-pressure pressure meets the first preset condition;

[0058] The electronic expansion valve is controlled to perform a first reset action, specifically;

[0059] The heat pump system is controlled to perform a 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 in the enthalpy increasing mode, the electronic expansion valve can be reset when the electronic expansion valve is in the serious step loss state.

[0062] Optionally, if the heat pump system detects that the electronic expansion valve is in the serious step loss state, the heat pump system needs to be immediately forced to shut down and then repaired.

[0063] The first reset number can be a preset number of resets that need to be performed when the electronic expansion valve is in the serious step loss state, such as 2, which is not limited here.

[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 be opened to a preset number of steps and closed to a preset number of steps 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 and is not limited here.

[0067] It should be noted that the maximum pulse of different types of electronic expansion valves can be different, such as 500B and 550B, which are not limited here.

[0068] The preset number of steps is the action amplitude set according to the maximum pulse. If the preset multiple is 2, 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, which is not limited here.

[0069] Specifically, the electronic expansion valve can be controlled to be opened to a preset number of steps and then closed to a preset number of steps, and finally the electronic expansion valve can be restored to the 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, i.e., 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, the electronic expansion valve will receive an open action instruction of 1000B (i.e., 2x500B) in this step. By performing this step, it can be ensured that the valve core or actuator of the electronic expansion valve can be fully moved, thereby possibly eliminating the step loss problem caused by the valve core sticking 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 closing amplitude is set to be 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 step loss 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 opening and closing actions described above are completed, the electronic expansion valve is 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 run in a relatively stable state when starting. Thus, by returning to the initial opening, 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 perform the above reset steps twice to ensure the accuracy of the reset.

[0073] Step 104, if the high pressure meets the second preset condition, control the electronic expansion valve to perform the second reset action.

[0074] Optionally, if the high pressure is less than or equal to the reference high pressure, it is judged that the high pressure meets the second preset condition, and then the electronic expansion valve is controlled to perform the 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.

[0075] It should be noted that if the heat pump system starts 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 electronic expansion valve.

[0076] Wherein, the target frequency refers to the compressor frequency range that the device should maintain during normal operation, or it can also be a specific frequency value, which is not limited here.

[0077] It should be noted that in the refrigeration or heating cycle, especially in a low-temperature and high-humidity environment, the surface of the evaporator of the heat pump system may be frosted. Frosting can affect heat exchange efficiency, so the heat pump system will periodically defrost to restore the performance of the heat exchanger. During the defrosting operation, the compressor frequency of the heat pump system is usually reduced.

[0078] It can be understood that if the compressor frequency of the heat pump system is reduced to the target frequency, and the high-pressure pressure is less than or equal to the reference high-pressure pressure, it indicates that the overall operation state of the electronic expansion valve is still within the acceptable range, and the normal work of the electronic expansion valve can be attempted to be restored through the reset operation.

[0079] The second reset number can be a pre-set reset number required when the electronic expansion valve is in a non-severe step-out state, for example, can be 1, which is not limited herein.

[0080] It can be understood that by resetting the electronic expansion valve in a non-severe step-out state in a timely manner, the decrease in refrigeration / heating capacity and energy efficiency loss caused by valve body step-out can be reduced, thereby improving the overall stability and performance of the system, and avoiding user discomfort and increase in system downtime caused by direct shutdown.

[0081] 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 described herein.

[0082] 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 temperature value, the low-pressure pressure and the high-pressure pressure meets the pre-set trend, it is judged that the electronic expansion valve is in a step-out state, then if the high-pressure pressure meets the first pre-set condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high-pressure pressure meets the second pre-set condition, the electronic expansion valve is controlled to perform a second reset action. Thus, by monitoring the electronic expansion valve opening degree and the exhaust temperature, the low-pressure pressure and the high-pressure pressure, the step-out condition can be accurately identified to avoid system failure caused by step-out. According to the two-stage reset action performed according to different pre-set conditions of the high-pressure pressure, the normal work of the expansion valve can be quickly restored, the system stability can be maintained, the operation efficiency can be improved, and the maintenance cost can be reduced.

[0083] Figure 2 is a flowchart of an electronic expansion valve step-out control method provided according to a second embodiment of the present disclosure.

[0084] As shown in Figure 2 , the method comprises:

[0085] Step 201, when the heat pump system does not start the enthalpy increasing mode, an electronic expansion valve opening degree continuous opening action signal is received.

[0086] 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.

[0087] In the embodiments of the present disclosure, the received electronic expansion valve opening degree continuous opening action signal can be a main electronic expansion valve opening degree continuous opening action signal.

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

[0089] It should be noted that, under normal circumstances, when the electronic expansion valve (here, it can be the main electronic expansion valve) receives a continuous opening-up action signal of the opening degree, more refrigerant should enter the evaporator. This will increase the evaporation amount in the evaporator and absorb more heat, so that the low-pressure pressure will increase, and the amount of refrigerant delivered to the condenser after being compressed by the compressor will also increase, and the high-pressure pressure will also change accordingly, but it is generally within a normal range, and 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 pressure decreases, and the high-pressure pressure increases, this is contrary to the normal expectation. This indicates that the electronic expansion valve (main electronic expansion valve) receives a continuous opening-up action signal of the opening degree, but actually does not effectively increase the refrigerant flow, and it is likely that a step-out occurs, which causes the electronic expansion valve to fail to normally adjust the opening degree according to the instruction, thereby causing abnormal changes in the system pressure and temperature.

[0091] Step 203, if the high-pressure pressure meets a first preset condition, a first reset action of the electronic expansion valve is controlled.

[0092] Step 204, if the high-pressure pressure meets a second preset condition, a second reset action of the electronic expansion valve is controlled.

[0093] It should be noted that the specific implementation of steps 203 and 204 can refer to the above embodiments, and will not be described here.

[0094] In the embodiments of the present disclosure, first, when the heat pump system does not start the enthalpy increasing mode, a continuous opening-up action signal of the opening degree of the electronic expansion valve is received, then if the exhaust temperature value increases, the low-pressure pressure decreases, and the high-pressure pressure increases, the preset trend is met, and it is judged that the electronic expansion valve is in a step-out state, then if the high-pressure pressure meets a first preset condition, a first reset action of the electronic expansion valve is controlled, and then if the high-pressure pressure meets a second preset condition, a second reset action of the electronic expansion valve is controlled. Therefore, when the heat pump system does not start the enthalpy increasing mode, the opening degree of the electronic expansion valve and the real-time monitoring of the exhaust temperature, the low-pressure pressure, and the high-pressure pressure are performed, the step-out condition is accurately identified, the reset action is performed in stages according to the high-pressure pressure, the normal work of the electronic expansion valve can be quickly restored, the system stability is ensured, and the failure probability and maintenance cost are reduced.

[0095] Figure 3 is a flowchart of an electronic expansion valve step-out control method provided according to a third embodiment of the present disclosure.

[0096] As shown in Figure 3 , the method comprises:

[0097] Step 301, when the heat pump system starts the enthalpy increasing mode, the auxiliary electronic expansion valve opening degree does not change, and a signal of continuously reducing the main electronic expansion valve opening degree is received.

[0098] 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.

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

[0100] It should be noted that in the enthalpy increasing state, the system usually increases the refrigerant flow entering the evaporator to improve the heating efficiency. If the main electronic expansion valve opening degree is continuously reduced at this time, similar changes to the non-enthalpy increasing state will occur, but the exhaust temperature may be more complex due to the enthalpy effect (may increase or decrease, depending on the comprehensive effect of the enthalpy increasing degree and the main electronic expansion valve reduction). The low-pressure pressure increases and the high-pressure pressure decreases, which are similar to the non-enthalpy increasing state, but due to the influence of enthalpy, these changes may be more significant or different. If the observed changes do not match the expectations and are not caused by other system faults, it can be judged that the main electronic expansion valve is in a step-out state.

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

[0102] Step 304, if the high-pressure pressure meets 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 embodiments, which will not be described here.

[0104] 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 a signal of continuously reducing the main electronic expansion valve opening degree is received, if the exhaust temperature value increases, the low-pressure pressure increases, and the high-pressure pressure decreases, the preset trend is met, and it is judged that the main electronic expansion valve is in a step-out state, then if the high-pressure pressure meets the first preset condition, the main electronic expansion valve is controlled to perform a first reset action, and then if the high-pressure pressure meets the second preset condition, the main electronic expansion valve is controlled to perform a second reset action. Thus, in the enthalpy increasing mode of the heat pump system, this strategy can accurately judge the step-out by monitoring the main electronic expansion valve opening degree and the changes of the exhaust temperature, the high and low pressure. The reset action is performed in stages according to the high-pressure pressure, which can correct the abnormality in time, ensure the stable operation of the system, avoid faults, improve the performance of the system, and reduce the maintenance cost.

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

[0106] As shown in Figure 4 , the method comprises:

[0107] Step 401, when the heat pump system is in an enthalpy-increasing mode, the auxiliary electronic expansion valve opening degree does not change, and a signal of continuously opening the main electronic expansion valve is received.

[0108] 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.

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

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

[0111] It should be noted that if the electronic expansion valve is in the enthalpy-increasing mode, the main electronic expansion valve is continuously opened, and in this case, if the main electronic expansion valve is continuously opened and the exhaust temperature decreases (which is usually not the expected result of the enthalpy-increasing state), at the same time, the changes of the low-pressure pressure and the high-pressure pressure are opposite to the above analysis (i.e., the low-pressure pressure decreases, and the high-pressure pressure increases), which usually indicates that the control of the main electronic expansion valve does not match the actual demand of the system, and such abnormal change can indicate that the main electronic expansion valve is out of step.

[0112] Step 403, if the high-pressure pressure meets a first preset condition, a first reset action of the main electronic expansion valve is controlled.

[0113] Step 404, if the high-pressure pressure meets a second preset condition, a second reset action of the main electronic expansion valve is controlled.

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

[0115] In the embodiments of the present disclosure, firstly, 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 continuously opens large action signal is received, then if the exhaust temperature value decreases, the low pressure decreases and the high pressure increases, the preset trend is met, it is judged that the main electronic expansion valve is in a step-out state, then if the high pressure meets the first preset condition, the main electronic expansion valve is controlled to execute the first reset action, and then if the high pressure meets the second preset condition, the main electronic expansion valve is controlled to execute the second reset action. Thus, when the system is running, the main electronic expansion valve opening degree, the exhaust temperature and the high and low pressure are monitored in real time. If abnormal changes are captured, it can be accurately judged whether the main electronic expansion valve is out of step. After determining that it is out of step, different preset conditions are set according to the high pressure, and the reset action is executed in stages. This not only quickly restores the expansion valve to a normal working state, avoids the loss of control of refrigerant flow caused by step-out, but also maintains stable system pressure, improves overall energy efficiency and reduces energy consumption. At the same time, the number of shutdowns caused by faults is reduced, the maintenance cost is reduced, and the service life of the equipment is prolonged.

[0116] Figure 5 The functional flowchart for the active identification of the electronic expansion valve reset is shown in Figure 5 The functional flowchart for the step-out self-diagnosis reset of the electronic expansion valve is shown in Figure 5 As shown, firstly, the exhaust temperature value, the low pressure and the high pressure are monitored in real time. Then, if the enthalpy increasing mode is not started, and the electronic expansion valve continuously action signal is received, then 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 continuously action signal is a continuously small action signal, the exhaust temperature value decreases, the low pressure increases, and the high pressure decreases; 2, the continuously action signal is a continuously large action signal, the exhaust temperature value increases, the low pressure decreases, and the high pressure increases. Otherwise, it indicates that the main electronic expansion valve is not in a step-out state.

[0117] If the enthalpy increasing mode is started, the auxiliary electronic expansion valve opening degree does not change, and the electronic expansion valve continuously action signal is received, then 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 continuously action signal is a continuously small action signal, the exhaust temperature value increases, the low pressure increases, and the high pressure decreases; 2, the continuously action signal is a continuously large action signal, the exhaust temperature value decreases, the low pressure decreases, and the high pressure increases. Otherwise, it indicates that the main electronic expansion valve is not in a step-out state.

[0118] Further, in the case that the main electronic expansion valve is in a step-out state, it is judged whether the high pressure is greater than the reference high pressure. If yes, it indicates that the main electronic expansion valve is seriously out of step, the first preset condition is met, and then the main electronic expansion valve is controlled to execute the first reset action. If not, it indicates that the main electronic expansion valve is not seriously out of step, the second preset condition is met, and then the main electronic expansion valve is controlled to execute the second reset action.

[0119] To facilitate better implementation of the electronic expansion valve step-out control method of the present disclosure, the present disclosure also 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.

[0120] 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:

[0121] The receiving module 610 is configured to receive an electronic expansion valve continuous action signal.

[0122] The determining module 620 is configured to determine that the electronic expansion valve is in a step-out state when the change trends of the exhaust temperature value, the low-pressure pressure, and the high-pressure pressure meet a preset trend.

[0123] The first control module 630 is configured to control the electronic expansion valve to perform a first reset action if the high-pressure pressure meets a first preset condition.

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

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

[0126] receive an electronic expansion valve opening degree continuous closing action signal when the heat pump system does not start the enthalpy increasing mode.

[0127] Therefore, the determining module is specifically configured to:

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

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

[0130] receive an electronic expansion valve opening degree continuous opening action signal when the heat pump system does not start the enthalpy increasing mode.

[0131] Therefore, the determining module is specifically configured to:

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

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

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

[0135] When the enthalpy-increasing mode of the heat pump system is started, the opening degree of the auxiliary electronic expansion valve does not change, and a signal of continuously reducing the opening degree of the main electronic expansion valve is received.

[0136] The judgment module is specifically configured to:

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

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

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

[0140] When the enthalpy-increasing mode of the heat pump system is started, the opening degree of the auxiliary electronic expansion valve does not change, and a signal of continuously reducing the opening degree of the main electronic expansion valve is received.

[0141] The judgment module is specifically configured to:

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

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

[0144] If the high-pressure pressure is greater than a reference high-pressure pressure, it is judged that the high-pressure pressure meets a first preset condition.

[0145] The electronic expansion valve is controlled to perform a first reset action, specifically:

[0146] The heat pump system is controlled 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 pressure is less than or equal to the reference high-pressure pressure, it is judged that the high-pressure pressure meets a second preset condition.

[0150] The electronic expansion valve is controlled to perform a second reset action, specifically:

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

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

[0153] 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 the maximum pulse multiplied by a preset multiple.

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

[0155] 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 temperature value, the low pressure and the high pressure meets a preset trend, it is judged that the electronic expansion valve is in a step loss state, then if the high pressure meets a first preset condition, the electronic expansion valve is controlled to perform a first reset action, and then if the high pressure meets a second preset condition, the electronic expansion valve is controlled to perform a second reset action. Therefore, by monitoring the electronic expansion valve opening degree and the exhaust temperature, the high and low pressure, the step loss condition can be accurately identified, and system failure caused by step loss can be avoided. According to different preset conditions of the high pressure, two-stage reset actions are performed, which can quickly restore the normal work of the expansion valve, maintain system stability, improve operation efficiency, and reduce maintenance cost.

[0156] In addition, the present disclosure also provides an electronic device, such as Figure 7 As shown in the figure, the structure of the electronic device related to the present disclosure is shown, in particular:

[0157] The electronic device can include 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, etc. Those skilled in the art can understand that Figure 7 The structure of the electronic device shown in the figure does not constitute a limitation on the electronic device, and can include more or fewer components than the figure, or combine certain components, or different component arrangements. Among them:

[0158] The processor 701 is the control center of the electronic device, which connects all parts of the electronic device through various interfaces and lines, executes the software programs and / or modules stored in the memory 702 and the data stored in the memory 702, and processes the data of the electronic device, so as to monitor the whole 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.

[0159] The memory 702 can be used to store software programs and modules, and the processor 701 can execute 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.), and the like; and 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 the processor 701 with access to the memory 702.

[0160] The electronic device also includes a power supply 703 for supplying power to various components. Preferably, the power supply 703 can be logically connected to the processor 701 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 703 can also include one or more direct current or alternating current power supplies, a recharging system, a power supply device debugging circuit, a power supply converter or inverter, a power supply state indicator, and the like.

[0161] The electronic device can also include an input unit 704, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0162] Although not shown, the electronic device can also include a display unit, etc., 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 programs stored in the memory 702 by the processor 701, so as to realize the steps in any electronic expansion valve out-of-step control method provided by the present disclosure.

[0163] In the embodiments of the present disclosure, first, the electronic expansion valve opening degree continuous action signal is received, then 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 a step-out state, 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 electronic expansion valve opening degree and the exhaust temperature, the high and low pressure, the step-out condition can be accurately identified, and system failure caused by step-out can be avoided. According to the two-stage reset action performed according to different preset conditions of the high pressure, the expansion valve can be quickly restored to normal operation, the system stability can be maintained, the operation efficiency can be improved, and the maintenance cost can be reduced.

[0164] The specific implementation of each operation can be seen from the foregoing embodiments, and will not be described here.

[0165] 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 controlling related hardware by the instructions, which can be stored in a computer readable storage medium and loaded and executed by a processor.

[0166] Therefore, 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 one of the electronic expansion valve step-out control methods provided by the present disclosure.

[0167] The specific implementation of each operation can be seen from the foregoing embodiments, and will not be described here.

[0168] 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.

[0169] Since the instructions stored in the computer readable storage medium can execute the steps in any one of the electronic expansion valve step-out control methods provided by the present disclosure, the beneficial effects of any one of the electronic expansion valve step-out control methods provided by the present disclosure can be achieved, which will be described in detail in the foregoing embodiments and will not be described here.

[0170] The above describes in detail the electronic expansion valve step-out control method, device, electronic device and computer readable storage medium provided by the present disclosure. The principles and implementation manners of the present disclosure are described by using 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 can be changed. In conclusion, the content of the specification 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 application relates to a method for controlling an electronic expansion valve of a heat pump system. The method comprises the following steps: receiving an electronic expansion valve opening degree continuous action signal; when the change trend of the exhaust temperature value, the low-pressure pressure and the high-pressure pressure meets a preset trend, judging that the electronic expansion valve is in a step-out state; if the high-pressure pressure meets a first preset condition, controlling the electronic expansion valve to perform a first reset action; if the high-pressure pressure meets a second preset condition, controlling the electronic expansion valve to perform a second reset action; the receiving of the electronic expansion valve opening degree continuous action signal comprises the following steps: when the heat pump system does not start the enthalpy increasing mode, receiving an electronic expansion valve opening degree continuous closing action signal; and then, when the change trend of the exhaust temperature value, the low-pressure pressure and the high-pressure pressure meets a preset trend, judging that the electronic expansion valve is in a step-out state, specifically, if the exhaust temperature value decreases, the low-pressure pressure increases and the high-pressure pressure decreases, the preset trend is met, and it is judged that the electronic expansion valve is in a step-out state; the receiving of the electronic expansion valve opening degree continuous action signal comprises the following steps: when the heat pump system does not start the enthalpy increasing mode, receiving an electronic expansion valve opening degree continuous opening action signal; and then, when the change trend of the exhaust temperature value, the low-pressure pressure and the high-pressure pressure meets a preset trend, judging that the electronic expansion valve is in a step-out state, specifically, if the exhaust temperature value increases, the low-pressure pressure decreases and the high-pressure pressure increases, the preset trend is met, and it is judged that the electronic expansion valve is in a step-out state; the controlling of the electronic expansion valve to perform the first reset action when the high-pressure pressure meets the first preset condition comprises the following steps: if the high-pressure pressure is greater than a reference high-pressure pressure, it is judged that the high-pressure pressure meets the first preset condition; and then, the controlling of the electronic expansion valve to perform the first reset action is specifically: controlling the heat pump system to perform a shutdown action; and resetting the electronic expansion valve according to a preset first reset number; 2. The method of claim 1, wherein, the controlling of the electronic expansion valve to perform the second reset action when the high-pressure pressure meets the second preset condition comprises the following steps: if the high-pressure pressure is less than or equal to the reference high-pressure pressure, it is judged that the high-pressure pressure meets the second preset condition; and then, the controlling of the electronic expansion valve to perform the second reset action is specifically: when the compressor frequency of the heat pump system is reduced to a target frequency, resetting the electronic expansion valve according to a preset second reset number. the receiving of the electronic expansion valve opening degree continuous action signal comprises the following steps: 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 temperature value, the low-pressure pressure and the high-pressure pressure meets a preset trend, judging that the electronic expansion valve is in a step-out state, specifically, 3. The method of claim 1, wherein, if the exhaust temperature value increases, the low-pressure pressure increases and the high-pressure pressure decreases, the preset trend is met, and it is judged 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 the following steps: 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, the auxiliary electronic expansion valve opening degree does not change, and a main electronic expansion valve opening degree continuously increases action signal is received; when the exhaust temperature value, the low-pressure pressure, and the high-pressure pressure change trends meet preset trends, determining that the electronic expansion valve is in a step-out state, specifically, if the exhaust temperature value decreases, the low-pressure pressure decreases, and the high-pressure pressure increases, the preset trends are met, and it is determined that the main electronic expansion valve is 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, controlling the electronic expansion valve 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, comprises: 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 the exhaust temperature value, the low-pressure pressure, and the high-pressure pressure change trends meet preset trends; a first control module configured to control the electronic expansion valve to perform a first resetting action if the high-pressure pressure meets a first preset condition; a second control module configured to control the electronic expansion valve to perform a second resetting action if the high-pressure pressure meets a second preset condition; the receiving module is specifically configured to receive an electronic expansion valve opening degree continuously decreasing action signal when the heat pump system does not start the enthalpy-increasing mode, and the determining module is specifically configured to determine that the electronic expansion valve is in a step-out state if the exhaust temperature value decreases, the low-pressure pressure increases, and the high-pressure pressure decreases; the receiving module is specifically 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, and the determining module is specifically configured to determine that the electronic expansion valve is in a step-out state if the exhaust temperature value increases, the low-pressure pressure decreases, and the high-pressure pressure increases; the first control module is specifically configured to determine that the high-pressure pressure meets the first preset condition if the high-pressure pressure is greater than a reference high-pressure pressure, and the control of the electronic expansion valve to perform the first resetting action specifically comprises: controlling the heat pump system to perform a shutdown action and resetting the electronic expansion valve according to a preset first resetting number; the second control module is specifically configured to determine that the high-pressure pressure meets the second preset condition if the high-pressure pressure is less than or equal to the reference high-pressure pressure, and the control of the electronic expansion valve to perform the second resetting action specifically comprises: resetting the electronic expansion valve according to a preset second resetting number when a compressor frequency of the heat pump system decreases 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.

Images