Electronic expansion valve abnormality determination system, method, and device

Abstract

The application relates to an electronic expansion valve abnormality determination system, method and device, which comprises an electronic expansion valve, a sensing data acquisition module, an environment temperature sensing bag and a control module. The electronic expansion valve is arranged on a refrigerant pipeline of an outdoor unit. The sensing data acquisition module is arranged in the outdoor unit and is used for acquiring sensing data. The environment temperature sensing bag is arranged at a condenser of the outdoor unit and is used for acquiring environment temperature data. The control module communicates with the sensing data acquisition module and the environment temperature sensing bag, and is used for determining whether the electronic expansion valve is abnormal based on the acquired sensing data and environment temperature data. The sensing data acquired by the sensing data acquisition module arranged in the outdoor unit and the environment temperature data acquired by the environment temperature sensing bag are used to determine whether the electronic expansion valve is abnormal, the data acquired by the indoor unit is not used to determine whether the electronic expansion valve is abnormal, and the determination of the abnormal state of the electronic expansion valve under the condition that the indoor unit does not communicate with the outdoor unit is realized.

Description

Technical Field

[0001] This application relates to the field of air conditioning control in the high-end equipment manufacturing industry, and in particular to an electronic expansion valve anomaly detection system, method and device. Background Technology

[0002] Air conditioning systems, as core equipment for modern building environmental control, are widely used in residential, commercial, and industrial sectors. In related technologies, air conditioning units typically achieve precise throttling control of cooling or heating cycles through the coordinated operation of a control module and an electronic expansion valve. Specifically, this control system covers the entire process from indoor evaporator coil temperature acquisition to outdoor unit valve step adjustment, including key aspects such as temperature sensing, data processing, and valve actuation. The success of the electronic expansion valve's step setting directly affects the system's energy efficiency and operational stability.

[0003] However, existing methods for detecting electronic expansion valve malfunctions directly rely on the temperature difference between the indoor evaporator coils, neglecting the special operating condition of units without communication between the indoor and outdoor units. This can lead to the outdoor unit being unable to obtain indoor heat exchanger coil temperature data, thus failing to effectively determine if the electronic expansion valve is malfunctioning. Therefore, for air conditioning systems without communication capabilities, traditional methods have detection blind spots, impacting system fault warnings and load protection, reducing equipment reliability and user experience. Summary of the Invention

[0004] This application provides an electronic expansion valve anomaly determination system, method, and apparatus to solve the problem of not being able to effectively determine whether the electronic expansion valve is abnormal in air conditioning systems without communication.

[0005] In a first aspect, this application provides an electronic expansion valve anomaly determination system, characterized in that it includes: an electronic expansion valve, a sensor data acquisition module, an ambient temperature sensor, and a control module; The electronic expansion valve is installed on the refrigerant pipeline of the outdoor unit; The sensor data acquisition module is installed in the outdoor unit and is used to collect sensor data; The ambient temperature sensor is installed at the condenser of the outdoor unit to collect ambient temperature data. The control module communicates with the sensor data acquisition module and the ambient temperature sensor to determine whether the electronic expansion valve is malfunctioning based on the acquired sensor data and ambient temperature data.

[0006] Optionally, the sensing data acquisition module includes at least one of the following: a pressure sensor and an exhaust temperature sensing bulb; The pressure sensor is installed on the refrigerant line of the outdoor unit to collect pressure data; The exhaust temperature sensor is installed on the refrigerant pipeline of the outdoor unit to collect exhaust temperature data.

[0007] Secondly, this application provides a method for determining anomalies in an electronic expansion valve, characterized in that the method is applied to a control module, the control module being the control module described in claim 1 or 2, and the method comprising: Obtain the number of steps of the electronic expansion valve in the outdoor unit and obtain the sensor data of the outdoor unit; The operating status of the electronic expansion valve is controlled based on the number of steps and sensor data. After running for a preset period of time in the operating state, the electronic expansion valve is determined to be abnormal based on the change in the sensor data.

[0008] Optionally, the steps of obtaining the number of steps for the electronic expansion valve in the outdoor unit include: The number of steps of the electronic expansion valve is continuously sampled to obtain the change in the number of steps of the electronic expansion valve within the first sampling period.

[0009] Optionally, the sensing data includes at least one of pressure data and exhaust temperature data, and acquiring the sensing data of the outdoor unit includes at least one of the following: The pressure data is continuously sampled to obtain the change in the pressure data within the second sampling period; The exhaust temperature data is continuously sampled to obtain the change in the exhaust temperature data within the second sampling period.

[0010] Optionally, controlling the operating state of the electronic expansion valve based on the number of steps and sensor data includes at least one of the following: In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the pressure data being less than a preset first pressure difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively. In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the exhaust temperature data being less than a preset first temperature difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively.

[0011] Optionally, determining whether the electronic expansion valve is malfunctioning based on the change in the sensing data includes: Determine the pressure difference between the pressure data after running for a preset time in the first step and the pressure data after running for a preset time in the second step; If the pressure difference is less than a preset second pressure difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

[0012] Optionally, determining whether the electronic expansion valve is malfunctioning based on the change in the sensing data includes: Determine the temperature difference between the exhaust temperature data after running for a preset time under the first step and the exhaust temperature data after running for a preset time under the second step; If the temperature difference is less than a preset second temperature difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

[0013] Thirdly, this application provides an electronic expansion valve malfunction determination device, characterized in that it includes: The data acquisition module is used to obtain the number of steps of the electronic expansion valve in the outdoor unit and to acquire the sensor data of the outdoor unit. A control module is used to control the operating state of the electronic expansion valve based on the number of steps and sensor data; An anomaly detection module is used to determine whether the electronic expansion valve is abnormal based on the change in the sensor data after running for a preset time in the operating state.

[0014] Fourthly, this application provides an air conditioner, characterized in that it includes an electronic expansion valve malfunction determination system as described in the first aspect.

[0015] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the electronic expansion valve anomaly determination method described in any one of the second aspects above.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art: The system provided in this application determines whether the electronic expansion valve is abnormal by using sensor data collected by the sensor data acquisition module installed on the outdoor unit and ambient temperature data collected by the ambient temperature sensor. This avoids determining whether the electronic expansion valve is abnormal based on data collected by the indoor unit, and enables the determination of the abnormal state of the electronic expansion valve when there is no communication between the indoor and outdoor units. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0020] Figure 1 This is a schematic diagram of an electronic expansion valve anomaly detection system provided in an embodiment of this application.

[0021] Figure 2 A flowchart of an electronic expansion valve anomaly determination method provided in an embodiment of this application.

[0022] Figure 3 A flowchart of an electronic expansion valve anomaly determination method provided in an embodiment of this application.

[0023] Figure 4 A flowchart of an electronic expansion valve anomaly determination method provided in an embodiment of this application.

[0024] Figure 5 This is a structural diagram of an electronic expansion valve anomaly detection device provided in an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures: 1. Variable frequency compressor; 2. Four-way valve; 3. Condenser; 4. Electronic expansion valve; 5. Thermal expansion valve; 6. Evaporator; 7. Outdoor air temperature sensor; 8. Pressure sensor; 9. Exhaust temperature sensor; 10. Ambient temperature sensor; 11. Control module. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] The following disclosure provides numerous different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0028] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0029] Air conditioning systems typically have electronic expansion valves controlled by a control module. However, the number of steps required to set the electronic expansion valve often cannot be automatically determined to be successful. Currently, the technology mainly uses the temperature difference between the indoor evaporator coil and the electronic expansion valve to determine if the electronic expansion valve is malfunctioning. However, for units where the indoor and outdoor units do not communicate, the outdoor unit cannot detect the temperature of the indoor heat exchanger coil, so this method cannot be used to determine if the electronic expansion valve is malfunctioning.

[0030] To address the technical problem in the prior art that outdoor units cannot independently determine whether the electronic expansion valve is malfunctioning, this application provides an electronic expansion valve malfunction determination system, method, and apparatus, which enables outdoor units to independently determine whether the electronic expansion valve is malfunctioning.

[0031] Figure 1 This is a schematic diagram of an electronic expansion valve anomaly detection system provided in an embodiment of this application. Figure 1 As shown, the system is divided into an outdoor unit and an indoor unit. The indoor unit includes a thermal expansion valve 5 and an evaporator 6. The outdoor unit includes a variable frequency compressor 1, a four-way valve 2, a condenser 3, an electronic expansion valve 4, an outdoor air temperature sensor 7, a pressure sensor 8, an exhaust temperature sensor 9, an ambient temperature sensor 10, and a control module 11. The condenser 3 and the fan are located in the same air duct. The pressure sensor 8 and the exhaust temperature sensor 9 belong to the sensor data acquisition module.

[0032] The electronic expansion valve 4 is installed on the refrigerant pipeline of the outdoor unit; The sensor data acquisition module is installed in the outdoor unit and is used to collect sensor data; The ambient temperature sensor 10 is installed at the condenser of the outdoor unit to collect ambient temperature data; The control module communicates with the sensor data acquisition module and the ambient temperature sensor to determine whether the electronic expansion valve is malfunctioning based on the acquired sensor data and ambient temperature data.

[0033] Optionally, the sensing data acquisition module includes at least one of the following: a pressure sensor 8 and an exhaust temperature sensing bulb 9; The pressure sensor 8 is installed on the refrigerant pipeline of the outdoor unit to collect pressure data; The exhaust temperature sensor 9 is installed on the refrigerant pipeline of the outdoor unit to collect exhaust temperature data.

[0034] In this embodiment, for the outdoor unit, with other operating parameters fixed, adjusting the electronic expansion valve 4 to different opening degrees will cause changes in the throttling effect of the electronic expansion valve 4, thereby causing corresponding changes in specific data in the outdoor unit. For example, the pressure data and exhaust temperature data in the refrigerant pipeline will change to corresponding degrees as the electronic expansion valve 4 is adjusted to different opening degrees. If there is no change, or the degree of change does not match the degree of change in the opening of the electronic expansion valve 4, it can be determined that the electronic expansion valve 4 is malfunctioning.

[0035] Therefore, in this embodiment, pressure data is collected by pressure sensor 8 installed in the outdoor unit, and exhaust temperature data is collected by exhaust temperature sensor 9. The system determines whether the electronic expansion valve 4 is malfunctioning based on the degree of change in pressure or exhaust temperature data with respect to the electronic expansion valve 4. Furthermore, since pressure sensor 8 and exhaust temperature sensor 9 are located in the outdoor unit, the control module 11 does not need to communicate with the indoor unit to obtain sensor data from the indoor unit.

[0036] Figure 2 This is a flowchart illustrating a method for determining anomalies in an electronic expansion valve, as provided in an embodiment of this application. Figure 2 As shown, the method is applied to Figure 1 The control module in the system shown includes: 201. Obtain the step count of the electronic expansion valve in the outdoor unit and obtain the sensor data of the outdoor unit; In this embodiment, the first step is to obtain basic data for a preliminary assessment of whether the electronic expansion valve may be malfunctioning. Specifically, this is achieved by monitoring the change in the number of steps of the outdoor unit's electronic expansion valve within a preset sampling period, as well as the change in the outdoor unit system's sensor data within the same or another sampling period, to provide a basis for subsequent anomaly detection. The electronic expansion valve contains a stepper motor that precisely controls the valve opening. The "number of steps" refers to the number of pulse signals controlling the motor's rotation, directly determining the valve needle's opening position and thus precisely regulating the refrigerant flow. A larger number of steps results in a larger valve opening and more refrigerant flowing through. Conversely, a smaller number of steps results in a smaller valve opening and less refrigerant flowing through.

[0037] The change in the number of steps reflects the adjustment range of the electronic expansion valve per unit time, while the change in the sensor data characterizes the degree of impact of this adjustment action on the actual operating state of the system. By acquiring both types of data simultaneously, a preliminary assessment of the electronic expansion valve's operating state can be made from two dimensions: valve action and system response.

[0038] 202, Control the operating state of the electronic expansion valve based on the number of steps and sensor data; In this embodiment, when the change in the number of steps of the outdoor unit's electronic expansion valve exceeds a first preset threshold, and the change in the sensor data is lower than a second preset threshold, it indicates that the electronic expansion valve may be in a potential state of adjustment failure or abnormal response. To effectively verify this abnormal state, the operating state of the electronic expansion valve is further switched to the first step and the second step, respectively. By making the electronic expansion valve operate stably at two different steps, a reliable comparative basis can be provided for subsequent anomaly determination based on the difference in changes in sensor data.

[0039] 203. After running for a preset time in the operating state, determine whether the electronic expansion valve is abnormal based on the change in the sensor data.

[0040] In this embodiment, after running for a preset duration at each step number, sensor data at the end of two different step number operation phases are further collected and compared. Specifically, the regulatory response capability of the electronic expansion valve is evaluated by comparing the sensor data states presented by the system when the electronic expansion valve is at two different preset step number positions. Sensor data is a physical quantity that reflects the key thermodynamic or pressure state in a refrigeration or heating cycle, and its value changes accordingly with the change of the electronic expansion valve step number. Under normal operating conditions, when the valve body switches from one step number to another and runs stably for a period of time, the sensor data should show a significant difference corresponding to the change in step number. Therefore, by calculating and comparing the difference between the sensor data at the end of the first step operation and the sensor data at the end of the second step operation, the actual impact of the regulation action on the system state can be quantified. When the sensor data does not show a significant change corresponding to the change in step number, that is, the actual regulatory capability of the electronic expansion valve is lost or severely insufficient, it can be determined that the electronic expansion valve is abnormal.

[0041] Optionally, upon detecting an anomaly, the system immediately executes a protective control strategy, namely, controlling the outdoor unit to shut down the load to prevent continued operation while the electronic expansion valve is malfunctioning, which could damage critical components such as the compressor or degrade system performance. Simultaneously, it outputs corresponding fault information to inform the user or maintenance personnel to perform repairs. As one implementation method, upon detecting an anomaly, the control module can send a shutdown command to shut down the outdoor unit load and display the corresponding fault code to alert the user.

[0042] Optionally, the steps of obtaining the number of steps for the electronic expansion valve in the outdoor unit include: The number of steps of the electronic expansion valve is continuously sampled to obtain the change in the number of steps of the electronic expansion valve within the first sampling period.

[0043] Optionally, the sensing data includes at least one of pressure data and exhaust temperature data, and acquiring the sensing data of the outdoor unit includes at least one of the following: The pressure data is continuously sampled to obtain the change in the pressure data within the second sampling period; The exhaust temperature data is continuously sampled to obtain the change in the exhaust temperature data within the second sampling period.

[0044] In this embodiment, the outdoor unit control module sets a first sampling period T1 and a second sampling period T2 through its internal timing module. The duration of T2 is slightly longer than that of T1 to ensure that changes in system pressure can fully reflect the response after the valve body actuates. The control module monitors the current step count of the electronic expansion valve in real time, and at the end of each first sampling period T1, it calculates the change in the number of steps of the electronic expansion valve within that first sampling period, ΔN, which is the change in the number of steps.

[0045] Optionally, the control module acquires the pressure data P of the outdoor unit system in real time through a pressure sensor, and calculates the change in system pressure during each second sampling period T2. The aforementioned ΔN and the change in pressure data serve as input data for subsequent judgments.

[0046] Optionally, the control module collects the exhaust temperature data of the outdoor unit system in real time through the exhaust temperature sensor, and calculates the change in exhaust temperature data within each second sampling period T2. The aforementioned ΔN and the change in exhaust temperature data serve as input data for subsequent judgments.

[0047] Optionally, controlling the operating state of the electronic expansion valve based on the number of steps and sensor data includes at least one of the following: In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the pressure data being less than a preset first pressure difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively. In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the exhaust temperature data being less than a preset first temperature difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively.

[0048] In this embodiment, when the change in the number of steps of the outdoor unit's electronic expansion valve exceeds the first preset threshold and the change in pressure data is lower than the first pressure difference threshold, it indicates that although the electronic expansion valve has made a large adjustment in opening, the system pressure data has not changed accordingly, and it may be in a potential state of adjustment failure or abnormal response.

[0049] Optionally, the first pressure difference threshold P1 is not a fixed value, but is determined by the rate of change Δt of the outdoor ambient temperature. 环 Outdoor ambient temperature t 环 The value is determined by both the step count change ΔN and the overall temperature. The control module obtains the temperature t from the outdoor ambient temperature sensor. 环 And calculate its rate of change Δt 环 Based on this, according to the formula P1=ω1·ΔN +ω2·Δt 环 +ω3·t 环 P1 is calculated, where ω1, ω2, and ω3 are dynamic weights. These weights are dynamically adjusted according to the current ambient temperature and valve step to adapt to the system characteristics under different operating conditions.

[0050] When the change in the number of steps of the outdoor unit's electronic expansion valve exceeds the first preset threshold and the change in the exhaust temperature data is lower than the first temperature difference threshold, it indicates that although the electronic expansion valve has made a large adjustment in opening, the system exhaust temperature data has not changed accordingly, and may be in a potential state of adjustment failure or abnormal response.

[0051] Optionally, the first temperature difference threshold t1 is not a fixed value, but is determined by the rate of change Δt of the outdoor ambient temperature. 环 Outdoor ambient temperature t 环 The value is determined by both the step count change ΔN and the overall temperature. The control module obtains the temperature t from the outdoor ambient temperature sensor. 环 And calculate its rate of change Δt 环 Based on this, according to the formula t1=ω4·ΔN +ω5·Δt 环 +ω6·t 环 t1 is calculated, where ω4, ω5, and ω6 are dynamic weights. These weights are dynamically adjusted according to the current ambient temperature and valve step to adapt to the system characteristics under different operating conditions.

[0052] To effectively verify this abnormal state, after meeting the above conditions, this step maintains the outdoor unit's operating parameters, including compressor frequency and outdoor fan speed, unchanged to avoid interference from changes in other operating variables in subsequent judgments. Based on this, the outdoor unit's electronic expansion valve is switched to the first and second steps respectively, and continuously runs for a preset time T3 at each step. By ensuring stable operation of the electronic expansion valve at two different opening degrees, a reliable comparative basis can be provided for subsequent anomaly judgment based on differences in sensor data.

[0053] Specifically, the control module reads the current compressor operating frequency through its internal frequency control module and writes this frequency value into the frequency lock register. Simultaneously, it reads the current outdoor fan speed and writes this speed value into the speed lock register. Throughout the subsequent testing process, both the compressor frequency control loop and the outdoor fan speed control loop use the values ​​in the lock registers as target values, thereby ensuring that the compressor frequency and outdoor fan speed do not change during the electronic expansion valve opening switch and operate for the preset duration.

[0054] Optionally, determining whether the electronic expansion valve is malfunctioning based on the change in the sensing data includes: Determine the pressure difference between the pressure data after running for a preset time in the first step and the pressure data after running for a preset time in the second step; If the pressure difference is less than a preset second pressure difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

[0055] In this embodiment, the difference between the pressure data obtained in the aforementioned steps at the end of the operation of the electronic expansion valve in the first step and the second step is compared with a preset second pressure difference threshold P2. If the difference is less than the second pressure difference threshold P2, it indicates that the system pressure data has not changed significantly with the change of opening degree when the electronic expansion valve is running at different opening degrees. That is, the actual regulating ability of the electronic expansion valve is lost or seriously insufficient. Based on this, it can be determined that the electronic expansion valve is abnormal.

[0056] Preferably, the second pressure difference threshold P2 is determined by the ambient temperature, and the control module has a pre-stored table showing the correspondence between different ambient temperatures and P2.

[0057] Optionally, determining whether the electronic expansion valve is malfunctioning based on the change in the sensing data includes: Determine the temperature difference between the exhaust temperature data after running for a preset time under the first step and the exhaust temperature data after running for a preset time under the second step; If the temperature difference is less than a preset second temperature difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

[0058] In this embodiment, the difference between the exhaust temperature data obtained in the aforementioned steps at the end of the operation of the electronic expansion valve in the first step and the second step is compared with a preset second temperature difference threshold t2. If the difference is less than the second temperature difference threshold t2, it indicates that the exhaust temperature data of the system has not changed significantly with the change of opening degree when the electronic expansion valve is running at different opening degrees. That is, the actual adjustment capability of the electronic expansion valve is lost or seriously insufficient. Based on this, it can be determined that the electronic expansion valve is abnormal.

[0059] Preferably, the second temperature difference threshold t2 is determined by the ambient temperature, and the control module has a pre-stored table showing the correspondence between different ambient temperatures and t2.

[0060] Figure 3 This is a flowchart illustrating a method for determining anomalies in an electronic expansion valve, as provided in an embodiment of this application. Figure 3 As shown, in one possible embodiment, for units without communication, the indoor unit's thermal expansion valve is often used for cooling throttling, and the outdoor unit's electronic expansion valve is often used for heating throttling. When cooling is running, the outdoor unit's electronic expansion valve is set to 480B.

[0061] When the unit is in heating operation, the outdoor unit's electronic expansion valve is freely adjustable. When it is detected that the number of steps ΔN of the outdoor unit's electronic expansion valve changes within the first sampling period T1 is greater than N0, and the difference in the change of the outdoor unit system pressure P(p) within the second sampling period T2 is less than P1, the outdoor unit's operating parameters, such as compressor frequency and outdoor fan speed, are kept unchanged, and the number of steps controlled by the outdoor unit's electronic expansion valve is N1 and N2, each running for a preset duration T3.

[0062] After two T3 time intervals, compare the system pressure P at the end of the interval. 13 and P 23 Is the difference less than P2 (P 13 For pressure data corresponding to N1, P 23 (The pressure data corresponding to N2). If the difference is less than P2, the electronic expansion valve is malfunctioning, shutting off the outdoor unit load. The control module sends a shutdown command to shut off the outdoor unit load, displays the corresponding fault code, and reminds the user to perform maintenance.

[0063] The parameters T1, N0, T2, P1, N1, N2, T3, and P2 are all empirical values. T2 is slightly greater than T1, and P1 is determined by the rate of change of the outdoor ambient temperature Δt. 环 Outdoor ambient temperature t 环 The number of steps ΔN in the change of the outdoor unit's electronic expansion valve within the sampling period T1 determines P1 = ω1. ΔN+ω2 Δt 环 +ω3 t 环 ω1, ω2, and ω3 are dynamic weights, which vary depending on the ambient temperature and the valve step. P2 is determined by the ambient temperature, and different ambient temperatures correspond to different P2 values.

[0064] Figure 4 This is a flowchart illustrating a method for determining anomalies in an electronic expansion valve, as provided in an embodiment of this application. Figure 4 As shown, in one possible embodiment, When the unit is in heating operation, the outdoor unit's electronic expansion valve is freely adjustable. If the change in the number of steps ΔN of the outdoor unit's electronic expansion valve within the first sampling period T1 is greater than N0, and the difference in the change of the outdoor unit's exhaust temperature Td(t) within the second sampling period T2 is less than t... d1 At this time, the outdoor unit's operating parameters, such as compressor frequency and outdoor fan speed, are kept unchanged, and the outdoor unit's electronic expansion valves are controlled to operate for a preset duration T3 for N1 and N2 respectively.

[0065] After two T3 times, compare the exhaust temperature t at the end of the two cycles. 13 and t 23 Is the difference less than t2 (t 13 t represents the exhaust temperature corresponding to N1. 23 (The exhaust temperature corresponding to N2). If the difference is less than t2, the electronic expansion valve is malfunctioning, shutting off the outdoor unit load. The control module sends a shutdown command to shut off the outdoor unit load, displays the corresponding fault code, and reminds the user to perform maintenance.

[0066] The parameters T1, N0, T2, t1, N1, N2, T3, and t2 above are all empirical values. T2 is slightly greater than T1, N0 is determined based on the flow curve of the electronic expansion valve in different systems, and t1 is determined by the rate of change of the outdoor ambient temperature Δt. 环 Outdoor ambient temperature t 环 The number of steps ΔN in the change of the outdoor unit's electronic expansion valve within the sampling period T1 is jointly determined, t1=ω4 ΔN+ω5 Δt 环 +ω6 t 环 ω4, ω5, and ω6 are dynamic weights, which vary depending on the ambient temperature and the valve step. t2 is determined by the ambient temperature, and different ambient temperatures correspond to different t2 values.

[0067] Figure 5 This is a structural diagram of an electronic expansion valve anomaly detection device provided in an embodiment of this application. Figure 5 As shown, the electronic expansion valve anomaly detection device is characterized by comprising: The data acquisition module 510 is used to acquire the number of steps of the electronic expansion valve in the outdoor unit and to acquire the sensor data of the outdoor unit. The control module 520 is used to control the operating state of the electronic expansion valve based on the number of steps and the sensor data; The anomaly detection module 530 is used to determine whether the electronic expansion valve is abnormal based on the change in the sensing data after running for a preset time in the operating state.

[0068] In one possible embodiment, an air conditioner is provided, characterized in that it includes the above-described electronic expansion valve anomaly detection system.

[0069] In one possible embodiment, a computer-readable storage medium is provided having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the above-described method for determining an abnormality of an electronic expansion valve.

[0070] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0071] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0072] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An electronic expansion valve anomaly detection system, characterized in that, include: Electronic expansion valve, sensor data acquisition module, ambient temperature sensor and control module; The electronic expansion valve is installed on the refrigerant pipeline of the outdoor unit; The sensor data acquisition module is installed in the outdoor unit and is used to collect sensor data; The ambient temperature sensor is installed at the condenser of the outdoor unit to collect ambient temperature data. The control module communicates with the sensor data acquisition module and the ambient temperature sensor to determine whether the electronic expansion valve is malfunctioning based on the acquired sensor data and ambient temperature data.

2. The system according to claim 1, characterized in that, The sensor data acquisition module includes at least one of the following: a pressure sensor and an exhaust temperature sensing bulb; The pressure sensor is installed on the refrigerant line of the outdoor unit to collect pressure data; The exhaust temperature sensor is installed on the refrigerant pipeline of the outdoor unit to collect exhaust temperature data.

3. A method for determining anomalies in an electronic expansion valve, characterized in that, The method is applied to a control module, wherein the control module is the control module according to claim 1 or 2, and the method includes: Obtain the number of steps of the electronic expansion valve in the outdoor unit and obtain the sensor data of the outdoor unit; The operating status of the electronic expansion valve is controlled based on the number of steps and sensor data. After running for a preset period of time in the operating state, the electronic expansion valve is determined to be abnormal based on the change in the sensor data.

4. The method according to claim 3, characterized in that, The steps for obtaining the electronic expansion valve in the outdoor unit include: The number of steps of the electronic expansion valve is continuously sampled to obtain the change in the number of steps of the electronic expansion valve within the first sampling period.

5. The method according to claim 4, characterized in that, The sensing data includes at least one of pressure data and exhaust temperature data, and the acquisition of the outdoor unit's sensing data includes at least one of the following: The pressure data is continuously sampled to obtain the change in the pressure data within the second sampling period; The exhaust temperature data is continuously sampled to obtain the change in the exhaust temperature data within the second sampling period.

6. The method according to claim 5, characterized in that, The control of the operating state of the electronic expansion valve based on the number of steps and sensor data includes at least one of the following: In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the pressure data being less than a preset first pressure difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively. In response to the change in the number of steps being greater than a preset number of steps threshold and the change in the exhaust temperature data being less than a preset first temperature difference threshold, the electronic expansion valve of the outdoor unit is controlled to operate in the first step and the second step states, respectively.

7. The method according to claim 6, characterized in that, The step of determining whether the electronic expansion valve is malfunctioning based on the change in the sensor data includes: Determine the pressure difference between the pressure data after running for a preset time under the first step and the pressure data after running for a preset time under the second step; If the pressure difference is less than a preset second pressure difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

8. The method according to claim 6, characterized in that, The step of determining whether the electronic expansion valve is malfunctioning based on the change in the sensor data includes: Determine the temperature difference between the exhaust temperature data after running for a preset time under the first step and the exhaust temperature data after running for a preset time under the second step; If the temperature difference is less than a preset second temperature difference threshold, the electronic expansion valve is determined to be malfunctioning; otherwise, the electronic expansion valve is determined to be normal.

9. An electronic expansion valve malfunction detection device, characterized in that, include: The data acquisition module is used to obtain the number of steps of the electronic expansion valve in the outdoor unit and to acquire the sensor data of the outdoor unit. A control module is used to control the operating state of the electronic expansion valve based on the number of steps and sensor data; An anomaly detection module is used to determine whether the electronic expansion valve is abnormal based on the change in the sensor data after running for a preset time in the operating state.

10. An air conditioner, characterized in that, Includes the electronic expansion valve anomaly detection system as described in claim 1 or 2.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for determining abnormalities of the electronic expansion valve as described in any one of claims 3-8.

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