A four-way valve reversal abnormality detection method, device, equipment and storage medium

Abstract

Embodiments of the present application disclose a four-way valve reversing abnormality detection method, device, equipment and storage medium; the water temperature difference value and the coil environment temperature difference value of the heat pump unit in the current working mode are obtained; it is judged whether the water temperature difference value and the coil environment temperature difference value are in the first parameter range corresponding to the current working mode; if in the first parameter range, the unit operating parameter of the heat pump unit is obtained, and it is judged whether the unit operating parameter is in the second parameter range corresponding to the current working mode; if in the second parameter range, the four-way valve reversing restart operation is carried out, and it is re-judged whether the water temperature difference value and the coil environment temperature difference value are in the first parameter range corresponding to the current working mode, if the water temperature difference value and the coil environment temperature difference value are in the first parameter range, the four-way valve reversing abnormality is judged; the problem of low accuracy of four-way valve abnormality detection can be solved, the accuracy of four-way valve abnormality detection is improved, and the abnormal false alarm rate of unit system is reduced.

Description

Technical Field

[0001] This application relates to the field of heat pump unit control technology, and in particular to a method, device, equipment and storage medium for detecting abnormal switching of a four-way valve. Background Technology

[0002] The four-way valve is a crucial component of a heat pump air conditioner. The air source heat energy system uses this valve to switch between cooling and heating modes, thus meeting users' indoor temperature requirements in different seasons. When the four-way valve malfunctions, the cooling or heating mode of the air source heat energy system will not operate normally, severely impacting normal user experience. Therefore, the reliability of the four-way valve's switching is paramount to the overall reliability of the air source heat energy system.

[0003] The existing method for detecting abnormal switching of four-way valves analyzes the temperature difference between the outlet and inlet water temperatures and compares this difference with a temperature threshold. If the temperature difference is greater than or equal to the threshold, the four-way valve is considered to be abnormally switching. This method of detecting abnormalities by analyzing the temperature difference between the outlet and inlet water temperatures has low accuracy. The temperature threshold is preset and stored as a default value in the system. However, the preset temperature threshold may not meet the unified judgment conditions for all operating modes under all conditions. For example, the four-way valve switching may be normal under low-frequency, low-load operation or under conditions of reduced heating capacity at extremely low temperatures, but if the temperature difference between the outlet and inlet water temperatures is greater than or equal to the temperature threshold, the unit may falsely report an abnormal four-way valve switching, triggering fault protection and causing the unit to stop abnormally under normal operating conditions. Summary of the Invention

[0004] This application provides a method, apparatus, device, and storage medium for detecting abnormal switching of a four-way valve, which can solve the problem of low accuracy in detecting abnormal switching of four-way valves, improve the accuracy of abnormal switching of four-way valves, and reduce the false alarm rate of abnormal switching of unit systems.

[0005] In a first aspect, embodiments of this application provide a method for detecting abnormal switching of a four-way valve, comprising:

[0006] Obtain the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current operating mode;

[0007] Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0008] If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the unit operating parameters of the heat pump unit are obtained, and it is determined whether the unit operating parameters are within the range of the second parameter corresponding to the current working mode.

[0009] If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet and outlet water temperature difference and the coil ambient temperature difference are re-determined to be within the range of the first parameter corresponding to the current working mode. If the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal.

[0010] Furthermore, the unit operating parameters include the compressor frequency value;

[0011] If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated to see if they are within the range of the first parameter corresponding to the current operating mode. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal, including:

[0012] When the heat pump unit is in heating or cooling mode, if the compressor frequency value is greater than or equal to a preset first threshold, the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve.

[0013] Alternatively, when the heat pump unit is in heating or cooling mode, if the compressor frequency value is less than a preset first threshold, the compressor frequency value is adjusted to the preset first threshold, and then the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve.

[0014] Reacquire the inlet and outlet water temperature difference and coil ambient temperature difference of the heat pump unit under the current heating or cooling mode.

[0015] Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0016] If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the four-way valve is determined to be abnormally switching.

[0017] Furthermore, the unit operating parameters include the compressor frequency value;

[0018] If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated to see if they are within the range of the first parameter corresponding to the current operating mode. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal, including:

[0019] When the heat pump unit is in defrost mode, if the compressor frequency value is equal to the preset second threshold, the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve.

[0020] Reacquire the inlet and outlet water temperature difference and coil ambient temperature difference of the heat pump unit under the current defrosting mode;

[0021] Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0022] If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the four-way valve is determined to be abnormally switching.

[0023] Furthermore, the inlet and outlet water temperature difference is the difference between the inlet water temperature and the outlet water temperature, and the coil ambient temperature difference is the difference between the coil temperature and the ambient temperature.

[0024] The step of determining whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current working mode includes:

[0025] When the heat pump unit is in heating mode, determine whether the temperature difference between the inlet and outlet water is greater than or equal to zero.

[0026] If the temperature difference between the inlet and outlet water is greater than or equal to zero, then determine whether the temperature difference of the coil environment is greater than zero.

[0027] If the temperature difference of the coil environment is greater than zero, then the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter.

[0028] Furthermore, when the heat pump unit is in heating mode, determining whether the inlet and outlet water temperature difference is greater than or equal to zero includes:

[0029] If the temperature difference between the inlet and outlet water is less than zero, then the return air temperature and coil temperature of the heat pump unit are obtained.

[0030] The return gas coil temperature difference value is obtained based on the difference between the return gas temperature and the coil temperature.

[0031] If the temperature difference value of the return air coil is greater than the preset third threshold, then determine whether the temperature difference value of the coil environment is greater than zero.

[0032] If the temperature difference of the coil environment is greater than zero, then the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter.

[0033] Furthermore, determining whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode includes:

[0034] When the heat pump unit is in cooling mode or defrosting mode, determine whether the temperature difference between the inlet and outlet water is less than or equal to zero.

[0035] If the temperature difference between the inlet and outlet water is less than or equal to zero, then determine whether the temperature difference between the coil environment and the coil is less than zero.

[0036] If the temperature difference of the coil environment is less than zero, then whether the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter corresponding to the current working mode.

[0037] Furthermore, when the heat pump unit is in cooling mode, after determining whether the inlet and outlet water temperature difference is less than or equal to zero, the following steps are taken:

[0038] If the temperature difference between the inlet and outlet water is greater than zero, then the return air temperature and the antifreeze pipe temperature of the heat pump unit are obtained.

[0039] The return air antifreeze temperature difference value is obtained based on the difference between the return air temperature and the antifreeze pipe temperature.

[0040] If the return air antifreeze temperature difference value is greater than the preset fourth threshold, then determine whether the coil environment temperature difference value is less than zero;

[0041] If the temperature difference of the coil environment is less than zero, whether the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter corresponding to the current working mode.

[0042] Furthermore, after determining whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode, the process includes:

[0043] If the inlet and outlet water temperature difference and the coil environment temperature difference are not within the range of the first parameter corresponding to the current working mode, the inlet and outlet water temperature difference and the coil environment temperature difference are re-determined every preset time interval to see if they are within the range of the first parameter.

[0044] If the results of the judgments exceed the preset number of times and the results of the judgments are all outside the range of the first parameter, then there is no abnormality in the switching of the four-way valve and the judgment is terminated.

[0045] In a second aspect, embodiments of this application provide a four-way valve directional switching abnormality detection device, comprising:

[0046] The temperature acquisition module is used to acquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current operating mode.

[0047] The first judgment module is used to determine whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0048] The second judgment module is used to obtain the unit operating parameters of the heat pump unit if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, and to determine whether the unit operating parameters are within the range of the second parameter corresponding to the current working mode.

[0049] The third judgment module is used to perform a four-way valve reversal restart operation if the unit operating parameters are within the range of the second parameter, and to re-determine whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current working mode. If the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversal is determined to be abnormal.

[0050] Furthermore, the unit operating parameters include the compressor frequency value; the third judgment module includes a first restart unit, a first temperature acquisition unit, a first judgment unit, and a second judgment unit;

[0051] The first restart unit is used to energize the four-way valve for a preset time and then de-energize it when the heat pump unit is in heating mode or cooling mode, if the compressor frequency value is greater than or equal to a preset first threshold, so as to realize the reversing restart of the four-way valve.

[0052] Alternatively, when the heat pump unit is in heating or cooling mode, if the compressor frequency value is less than a preset first threshold, the compressor frequency value is adjusted to the preset first threshold, and then the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve.

[0053] The first temperature acquisition unit is used to reacquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current heating mode or cooling mode.

[0054] The first judgment unit is used to determine whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0055] The second judgment unit is used to determine that the four-way valve switching is abnormal if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter.

[0056] Furthermore, the unit operating parameters include the compressor frequency value; the third judgment module includes a second restart unit, a second temperature acquisition unit, a third judgment unit, and a fourth judgment unit;

[0057] The second restart unit is used to, when the heat pump unit is in defrost mode, if the compressor frequency value is equal to a preset second threshold, energize the four-way valve for a preset time and then de-energize it to achieve the reversing restart of the four-way valve;

[0058] The second temperature acquisition unit is used to reacquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current defrosting mode;

[0059] The third judgment unit is used to determine whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode;

[0060] The fourth judgment unit is used to determine that the four-way valve switching is abnormal if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter.

[0061] Furthermore, the inlet and outlet water temperature difference is the difference between the inlet water temperature and the outlet water temperature, and the coil ambient temperature difference is the difference between the coil temperature and the ambient temperature.

[0062] The first judgment module includes a fifth judgment unit, a sixth judgment unit, and a seventh judgment unit;

[0063] The fifth judgment unit is used to determine whether the temperature difference between the inlet and outlet water is greater than or equal to zero when the heat pump unit is in heating mode.

[0064] The sixth judgment unit is used to determine whether the temperature difference of the coil environment is greater than zero if the temperature difference between the inlet and outlet water is greater than or equal to zero.

[0065] The seventh judgment unit is used to determine if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter if the temperature difference between the coil environment and the coil environment are greater than zero.

[0066] Furthermore, the first judgment module also includes a third temperature acquisition unit, a first calculation unit, an eighth judgment unit, and a ninth judgment unit;

[0067] The third temperature acquisition unit is used to acquire the return air temperature and coil temperature of the heat pump unit if the temperature difference between the inlet and outlet water is less than zero.

[0068] The first calculation unit is used to obtain the return gas coil temperature difference value based on the difference between the return gas temperature and the coil temperature;

[0069] The eighth judgment unit is used to determine whether the ambient temperature difference of the coil is greater than zero if the temperature difference value of the return air coil is greater than a preset third threshold.

[0070] The ninth judgment unit is used to determine if the temperature difference between the coil environment and the coil environment is within the range of the first parameter if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are greater than zero.

[0071] Furthermore, the first judgment module also includes a tenth judgment unit, an eleventh judgment unit, and a twelfth judgment unit;

[0072] The tenth judgment unit is used to determine whether the inlet and outlet water temperature difference is less than or equal to zero when the heat pump unit is in cooling mode or defrosting mode.

[0073] The eleventh judgment unit is used to determine whether the temperature difference of the coil environment is less than zero if the temperature difference between the inlet and outlet water is less than or equal to zero.

[0074] The twelfth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode if the coil environment temperature difference is less than zero.

[0075] Furthermore, the first judgment unit also includes a fourth temperature acquisition unit, a second calculation unit, a thirteenth judgment unit, and a fourteenth judgment unit;

[0076] The fourth temperature acquisition unit is used to acquire the return air temperature and antifreeze pipe temperature of the heat pump unit if the temperature difference between the inlet and outlet water is greater than zero.

[0077] The second calculation unit is used to obtain the return air antifreeze temperature difference value based on the difference between the return air temperature and the antifreeze pipe temperature;

[0078] The thirteenth judgment unit is used to determine whether the coil environment temperature difference is less than zero if the return air antifreeze temperature difference value is greater than the preset fourth threshold.

[0079] The fourteenth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode if the coil environment temperature difference is less than zero.

[0080] Furthermore, the device also includes a fourth judgment module and a fifth judgment module;

[0081] The fourth judgment module is used to re-judge whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter at preset time intervals if the inlet and outlet water temperature difference and the coil environment temperature difference are not within the range of the first parameter corresponding to the current working mode.

[0082] The fifth judgment module is used to determine that the four-way valve switching is not abnormal and to terminate the judgment when the judgment results for more than a preset number of times are all that the inlet and outlet water temperature difference and the coil environment temperature difference are not within the range of the first parameter.

[0083] In a third aspect, embodiments of this application provide a four-way valve directional switching anomaly detection device, comprising:

[0084] Memory and one or more processors;

[0085] The memory is used to store one or more programs;

[0086] When the one or more programs are executed by the one or more processors, the one or more processors implement the four-way valve commutation anomaly detection method as described in the first aspect.

[0087] In a fourth aspect, embodiments of this application provide a storage medium for storing computer-executable instructions, which, when executed by a computer processor, are used to perform the four-way valve swivel anomaly detection method as described in the first aspect.

[0088] In this embodiment, when the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range, and the unit operating parameters are within the second parameter range, a four-way valve reversing and restarting operation is performed. The inlet water temperature difference and the coil ambient temperature difference are then re-determined to see if they are within the first parameter range. If the inlet and outlet water temperature differences and the ambient temperature difference are still within the first parameter range, the four-way valve reversing is determined to be abnormal. By employing the aforementioned technical means, when the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range, and the unit operating parameters are within the second parameter range, a re-judgment is performed after a four-way valve reversal and restart operation. This avoids the problem of low accuracy in four-way valve anomaly detection. The second judgment after the four-way valve reversal and restart avoids classifying recoverable four-way valve misalignment as anomaly. Only when the result of the second judgment after the four-way valve reversal and restart still shows that the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range is the four-way valve reversal anomaly finally determined. This improves the accuracy of four-way valve reversal anomaly detection, reduces the false alarm rate of the heat pump unit, and reduces the number of operational errors caused by false alarms, thereby lowering the overall failure rate of the heat pump unit. Attached Figure Description

[0089] Figure 1 This is a flowchart of a method for detecting abnormal switching of a four-way valve provided in an embodiment of this application;

[0090] Figure 2 This is a schematic diagram of the connections of various devices in a heat pump unit provided in an embodiment of this application;

[0091] Figure 3 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in heating mode, provided in an embodiment of this application.

[0092] Figure 4 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in a cooling mode, provided in an embodiment of this application.

[0093] Figure 5 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in defrosting mode, provided in an embodiment of this application.

[0094] Figure 6 This is a schematic diagram of the structure of a four-way valve reversing abnormality detection device provided in an embodiment of this application;

[0095] Figure 7 This is a schematic diagram of the structure of a four-way valve reversing abnormality detection device provided in an embodiment of this application. Detailed Implementation

[0096] To make the objectives, technical solutions, and advantages of this application clearer, specific embodiments of this application will be described in further detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely for explaining this application and not for limiting it. It should also be noted that, for ease of description, only the parts relevant to this application are shown in the drawings, not all of them. Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but may also have additional steps not included in the drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0097] The method, apparatus, equipment, and storage medium for detecting abnormal four-way valve reversing provided in this application aim to re-evaluate the valve after restarting its reversing operation when the inlet water temperature difference and the coil ambient temperature difference are within a first parameter range, and the unit operating parameters are within a second parameter range. This avoids misclassifying recoverable incomplete reversing as abnormal. Only when the second evaluation after restarting the valve shows the inlet water temperature difference and the coil ambient temperature difference are still within the first parameter range is the valve reversing abnormality finally determined. This improves the accuracy of four-way valve abnormality detection and reduces the false alarm rate of the unit system. In contrast, traditional four-way valve reversing abnormality detection methods typically analyze the temperature difference between the outlet and inlet water temperatures, comparing this difference to a temperature threshold. If the temperature difference is greater than or equal to the threshold, the valve is considered abnormal. This method of detecting four-way valve anomalies based on the temperature difference between the outlet and inlet water temperatures has low accuracy. The temperature difference threshold is preset and stored as a default value in the system. However, this preset threshold may not meet the unified judgment conditions for all operating modes under all conditions. For example, the four-way valve switching action may be normal under low-frequency, low-load operation or ultra-low temperature heating capacity reduction conditions, but if the temperature difference between the outlet and inlet water temperatures is greater than or equal to the temperature difference threshold, the unit will falsely report a four-way valve switching anomaly, triggering fault protection and causing the unit to stop abnormally during normal operation. Therefore, this application provides a four-way valve switching anomaly detection method to solve the problem of low accuracy in existing four-way valve switching anomaly detection methods.

[0098] Figure 1 A flowchart of a four-way valve reversing anomaly detection method provided in this application embodiment is given. The four-way valve reversing anomaly detection method provided in this embodiment can be executed by a four-way valve reversing anomaly detection device. This four-way valve reversing anomaly detection device can be implemented by software and / or hardware. The four-way valve reversing anomaly detection device can be composed of two or more physical entities, or it can be composed of a single physical entity. Generally, the four-way valve reversing anomaly detection device can be a terminal device, such as a computer device.

[0099] The following description uses a computer device as the main body for implementing the four-way valve reversing anomaly detection method. (Refer to...) Figure 1 The specific methods for detecting abnormal switching of the four-way valve include:

[0100] S101. Obtain the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current operating mode.

[0101] The four-way valve is one of the important components of a heat pump air conditioner. The air source heat energy system uses the four-way valve to switch between cooling and heating modes, thereby meeting the user's requirements for indoor temperature in different seasons. Figure 2 This is a schematic diagram of the connection of various devices in a heat pump unit provided in an embodiment of this application, with reference to... Figure 2 The heat pump unit includes a shell-and-tube heat exchanger 10, a four-way valve 20, an electronic expansion valve 30, a compressor 40, and a finned heat exchanger 50. The shell-and-tube heat exchanger 10 is connected to the first end of the four-way valve 20 and the first end of the electronic expansion valve 30; the second end of the electronic expansion valve 30 is connected to the finned heat exchanger 50. The second and third ends of the four-way valve 20 are connected to the compressor 40, and the fourth end is connected to the finned heat exchanger 50. The shell-and-tube heat exchanger 10 is equipped with an inlet water temperature sensor, an outlet water temperature sensor, and an antifreeze temperature sensor. The finned heat exchanger 50 is equipped with a coil temperature sensor, an ambient temperature sensor, and a compressor return gas temperature sensor. The inlet water temperature sensor detects the inlet water temperature, the outlet water temperature sensor detects the outlet water temperature, the antifreeze temperature sensor detects the antifreeze pipe temperature, the coil temperature sensor detects the coil temperature, the ambient temperature sensor detects the ambient temperature, and the compressor return gas temperature sensor detects the return gas temperature.

[0102] After the compressor starts for a preset time, the inlet water temperature, outlet water temperature, coil temperature, and ambient temperature of the heat pump unit in the current operating mode are acquired. The inlet and outlet water temperature difference is obtained based on the difference between the inlet and outlet water temperatures. The coil and ambient temperature difference is obtained based on the difference between the coil temperature and the ambient temperature. Preliminary judgment of four-way valve reversal abnormalities is made using the acquired inlet and outlet water temperature differences and coil and ambient temperature differences.

[0103] It should be noted that the operating modes include heating mode, cooling mode, and defrosting mode.

[0104] S102. Determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode.

[0105] Based on the obtained inlet and outlet water temperature difference and coil ambient temperature difference, a preliminary judgment on the four-way valve switching anomaly is performed. Specifically, it checks whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode. If these values ​​are not within the first parameter range, the judgment result indicates that the four-way valve switching is not abnormal. Then, after a preset time interval, the judgment is repeated to check whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode. If these values ​​are within the first parameter range, step S103 is executed for further judgment.

[0106] In one embodiment, when the heat pump unit is in heating mode, it is determined whether the temperature difference between the inlet and outlet water is greater than or equal to zero. If the temperature difference is greater than or equal to zero, it is determined whether the temperature difference between the coil environment and the inlet / outlet water is greater than or equal to zero. If the temperature difference is greater than zero, then the temperature difference between the inlet / outlet water and the temperature difference between the coil environment are within the first parameter range corresponding to the heating mode, and step S103 is executed for further determination. If the temperature difference between the coil environment and the inlet / outlet water is less than or equal to zero, then after waiting for a preset time interval, the determination of whether the temperature difference between the inlet / outlet water and the temperature difference between the coil environment are within the first parameter range corresponding to the current heating mode is executed again.

[0107] In one embodiment, when the heat pump unit is in heating mode, it is determined whether the temperature difference between the inlet and outlet water is greater than or equal to zero. If the temperature difference is less than zero, the return air temperature and coil temperature of the heat pump unit are obtained. The return air coil temperature difference is obtained based on the difference between the return air temperature and the coil temperature. If the return air coil temperature difference is greater than a preset third threshold, it is determined whether the coil ambient temperature difference is greater than zero. If the coil ambient temperature difference is greater than zero, the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the heating mode, and step S103 is executed for further determination. If the return air coil temperature difference is less than or equal to the preset third threshold, after waiting for a preset time interval, the determination of whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current heating mode is executed again, and step S103 is executed. If the temperature difference between the coil and the ambient temperature is less than or equal to zero, then after waiting for a preset time interval, the judgment will be executed again to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil and the ambient temperature are within the range of the first parameter corresponding to the current heating mode.

[0108] In one embodiment, the preset time interval is 15 seconds, that is, after waiting for 15 seconds, the judgment is re-executed to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current heating mode.

[0109] In one embodiment, the preset third threshold is 20°C.

[0110] In one embodiment, when the heat pump unit is in command mode or defrost mode, it is determined whether the inlet and outlet water temperature difference is less than or equal to zero. If the inlet and outlet water temperature difference is less than or equal to zero, it is determined whether the coil ambient temperature difference is less than zero. If the coil ambient temperature difference is less than zero, then the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (cooling mode or defrost mode), and step S103 is executed for further determination. If the coil ambient temperature difference is greater than or equal to zero, then after waiting for a preset time interval, the determination of whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (cooling mode or defrost mode) is executed again.

[0111] In one embodiment, when the heat pump unit is in command mode, it is determined whether the inlet and outlet water temperature difference is less than or equal to zero. If the inlet and outlet water temperature difference is greater than zero, the return gas temperature and antifreeze pipe temperature of the heat pump unit are obtained. The return gas antifreeze temperature difference is obtained based on the difference between the return gas temperature and the antifreeze pipe temperature. If the return gas antifreeze temperature difference is greater than a preset fourth threshold, it is determined whether the coil ambient temperature difference is less than zero. If the coil ambient temperature difference is less than zero, the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current cooling mode, and S103 is executed for further judgment. If the coil ambient temperature difference is greater than or equal to zero, after waiting for a preset time interval, the judgment on whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current cooling mode is executed again.

[0112] In one embodiment, the preset time interval is 15 seconds, that is, after waiting for 15 seconds, the judgment is re-executed to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current heating mode.

[0113] In one embodiment, the preset fourth threshold is 20°C.

[0114] As described above, by determining whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode, if both are within this range, a preliminary judgment is made that the four-way valve switching is abnormal. By simultaneously judging the inlet / outlet water temperature difference and the coil ambient temperature difference, the low accuracy caused by relying solely on the inlet / outlet water temperature difference is avoided. This increases the dimensionality of the four-way valve switching anomaly judgment, thereby improving the accuracy of four-way valve anomaly detection.

[0115] S103. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then obtain the unit operating parameters of the heat pump unit and determine whether the unit operating parameters are within the range of the second parameter corresponding to the current working mode.

[0116] Once a four-way valve reversing malfunction is confirmed, the valve will be replaced to allow the heat pump unit to resume normal operation. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, a preliminary judgment of a four-way valve reversing malfunction is made. However, since the inlet / outlet water temperature difference and the coil ambient temperature difference may be due to incomplete reversing, directly determining a reversing malfunction and replacing the valve would be wasteful. Therefore, a secondary judgment is needed to determine if the four-way valve reversing is malfunctioning. By acquiring the heat pump unit's operating parameters and determining whether these parameters are within the second parameter range corresponding to the current operating mode, a secondary judgment of four-way valve reversing malfunction detection is performed based on the judgment result. In summary, by determining that the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the operating mode, further judgment is performed using the heat pump unit's operating parameters to repair recoverable malfunctions caused by improper four-way valve reversing operation, thereby improving the accuracy of four-way valve malfunction detection.

[0117] S104. If the unit operating parameters are within the range of the second parameter, then the four-way valve switching restart operation is performed, and the inlet and outlet water temperature difference and the coil ambient temperature difference are re-determined to be within the range of the first parameter corresponding to the current working mode. If the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, then the four-way valve switching is determined to be abnormal.

[0118] If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode, the unit's operating parameters are acquired, and it is determined whether these parameters are within the second parameter range corresponding to the current operating mode. If the operating parameters are within the second parameter range, a four-way valve reversing restart operation is performed. For example, this can be achieved by energizing the four-way valve for a preset time and then de-energizing it. After the four-way valve reversing restart operation is completed, the inlet / outlet water temperature difference and the coil ambient temperature difference of the heat pump unit under the current operating mode are acquired again, and it is re-determined whether these parameters are within the first parameter range corresponding to the current operating mode. If, after the four-way valve reversing restart, the re-determined parameters are still within the first parameter range corresponding to the current operating mode, the four-way valve reversing is deemed abnormal.

[0119] After completing the four-way valve reversal and restart operation, the inlet and outlet water temperature difference and the coil ambient temperature difference of the heat pump unit in the current operating mode are re-acquired, and it is re-determined whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode. If, after completing the four-way valve reversal and restart, the result of the re-determination is that the inlet and outlet water temperature difference and the coil ambient temperature difference are not within the first parameter range corresponding to the current operating mode, then it is determined that the four-way valve reversal is not abnormal, and after waiting for the preset time interval, the determination of whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current cooling mode is performed again. By restarting the four-way valve, recoverable anomalies such as improper four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are reassessed. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are not within the range of the first parameter, the four-way valve anomaly is determined to be a recoverable anomaly such as improper four-way valve reversal. Since the anomaly has been repaired by restarting the four-way valve, it is finally determined that there is no anomaly in the four-way valve reversal. This avoids the need to replace the four-way valve due to misjudgment based on recoverable anomalies, saving the cost of replacing the four-way valve and thus reducing the overall operation and maintenance cost of the heat pump unit.

[0120] In one embodiment, the unit operating parameters include the compressor frequency value. When the heat pump unit is in heating or cooling mode, if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (heating or cooling mode), the compressor frequency value of the heat pump unit is acquired, and it is determined whether the compressor frequency value is greater than or equal to a preset first threshold. If the compressor frequency value is greater than or equal to the preset first threshold, a four-way valve reversing restart operation is performed. For example, the four-way valve reversing restart is achieved by energizing the four-way valve for a preset time and then de-energizing it. After the four-way valve reversing restart operation is completed, the inlet / outlet water temperature difference and the coil ambient temperature difference of the heat pump unit in the current heating or cooling mode are acquired again; it is determined whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (heating or cooling mode); if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, the four-way valve reversing is determined to be abnormal. By restarting the four-way valve, recoverable anomalies such as incomplete four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are re-evaluated. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range, it is determined that the four-way valve anomaly is not a recoverable anomaly such as incomplete four-way valve reversal. Therefore, the four-way valve reversal is ultimately determined to be abnormal, thereby improving the accuracy of four-way valve reversal anomaly detection.

[0121] In one embodiment, the unit operating parameters include the compressor frequency value. When the heat pump unit is in heating or cooling mode, if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (heating or cooling mode), the compressor frequency value of the heat pump unit is acquired, and it is determined whether the compressor frequency value is greater than or equal to a preset first threshold. If the compressor frequency value is less than the preset first threshold, the compressor frequency value is adjusted to the preset first threshold value, and then a four-way valve reversing restart operation is performed. For example, the four-way valve reversing restart is achieved by energizing the four-way valve for a preset time and then de-energizing it. After the four-way valve reversing restart operation is completed, the inlet / outlet water temperature difference and the coil ambient temperature difference of the heat pump unit in the current heating or cooling mode are acquired again; it is determined whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode (heating or cooling mode); if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, the four-way valve reversing is determined to be abnormal. By restarting the four-way valve, recoverable anomalies such as incomplete four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are re-evaluated. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range, it is determined that the four-way valve anomaly is not a recoverable anomaly such as incomplete four-way valve reversal. Therefore, the four-way valve reversal is ultimately determined to be abnormal, thereby improving the accuracy of four-way valve reversal anomaly detection.

[0122] In one embodiment, when the heat pump unit is in heating mode or cooling mode, after completing the four-way valve reversal and restart operation, the inlet and outlet water temperature difference value and the coil ambient temperature difference value of the heat pump unit in the current heating mode or cooling mode are re-acquired; it is determined whether the inlet and outlet water temperature difference value and the coil ambient temperature difference value are within the first parameter range corresponding to the current working mode (heating mode or cooling mode); if the inlet and outlet water temperature difference value and the coil ambient temperature difference value are within the first parameter range, it is determined that the four-way valve reversal is abnormal. By restarting the four-way valve, recoverable anomalies such as improper four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are reassessed. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are not within the range of the first parameter, the four-way valve anomaly is determined to be a recoverable anomaly such as improper four-way valve reversal. Since the anomaly has been repaired by restarting the four-way valve, it is finally determined that there is no anomaly in the four-way valve reversal. This avoids the need to replace the four-way valve due to misjudgment based on recoverable anomalies, saving the cost of replacing the four-way valve and thus reducing the overall operation and maintenance cost of the heat pump unit.

[0123] In one embodiment, the preset first threshold is 48 Hz.

[0124] In one embodiment, the four-way valve can be switched and restarted by energizing it for 10 seconds and then de-energizing it.

[0125] In one embodiment, the unit operating parameters include the compressor frequency value. When the heat pump unit is in defrost mode, if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current defrost mode, the compressor frequency value of the heat pump unit is acquired, and it is determined whether the compressor frequency value is equal to a preset second threshold. If the compressor frequency value is equal to the preset second threshold, a four-way valve reversing restart operation is performed. For example, the four-way valve reversing restart is achieved by energizing the four-way valve for a preset time and then de-energizing it. After the four-way valve reversing restart operation is completed, the inlet / outlet water temperature difference and the coil ambient temperature difference of the heat pump unit in the current defrost mode are acquired again; it is determined whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current defrost mode; if the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, the four-way valve reversing is determined to be abnormal. By restarting the four-way valve, recoverable anomalies such as incomplete four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are re-evaluated. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range, it is determined that the four-way valve anomaly is not a recoverable anomaly such as incomplete four-way valve reversal. Therefore, the four-way valve reversal is ultimately determined to be abnormal, thereby improving the accuracy of four-way valve reversal anomaly detection.

[0126] In one embodiment, when the heat pump unit is in defrost mode, after completing the four-way valve reversal and restart operation, the inlet and outlet water temperature difference value and the coil ambient temperature difference value of the heat pump unit in the current defrost mode are re-acquired; it is determined whether the inlet and outlet water temperature difference value and the coil ambient temperature difference value are within the first parameter range corresponding to the current defrost mode; if the inlet and outlet water temperature difference value and the coil ambient temperature difference value are within the first parameter range, it is determined that the four-way valve reversal is abnormal. By restarting the four-way valve, recoverable anomalies such as improper four-way valve reversal can be eliminated. At this time, the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment are reassessed. If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are not within the range of the first parameter, the four-way valve anomaly is determined to be a recoverable anomaly such as improper four-way valve reversal. Since the anomaly has been repaired by restarting the four-way valve, it is finally determined that there is no anomaly in the four-way valve reversal. This avoids the need to replace the four-way valve due to misjudgment based on recoverable anomalies, saving the cost of replacing the four-way valve and thus reducing the overall operation and maintenance cost of the heat pump unit.

[0127] In one embodiment, the preset second threshold is 70 Hz.

[0128] In one embodiment, step S102 determines whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode. If these values ​​are not within the range, the system re-determines whether they are within the range at preset intervals. If the results of more than a preset number of determinations all indicate that the inlet / outlet water temperature difference and the coil ambient temperature difference are not within the range of the first parameter range corresponding to the current operating mode, the system determines that the four-way valve reversal is not abnormal and terminates the determination. If the results of a preset number of determinations all indicate that the four-way valve reversal is not abnormal, it is assumed that there is no abnormality after the four-way valve reversal, and the determination is terminated to avoid resource waste caused by continuous determination, thereby saving operation and maintenance costs.

[0129] Figure 3 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in heating mode, provided in an embodiment of this application. (Refer to...) Figure 3 The specific methods for detecting abnormal switching of the four-way valve include:

[0130] S201. After the compressor starts for the preset time, the number of judgments is reset.

[0131] When the heat pump unit is running in heating mode, after the compressor starts for a preset time, for example, 3 minutes after starting, the number of judgments is reset to zero and S202 is executed.

[0132] S202, Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold number.

[0133] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is greater than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 8 counts. If the count exceeds the preset threshold, step S215 is executed. If the count is less than or equal to the preset threshold, step S203 is executed.

[0134] S203. Determine whether the inlet water temperature is greater than or equal to the outlet water temperature.

[0135] Determine if the inlet water temperature of the heat pump unit is greater than or equal to the outlet water temperature. If the inlet water temperature is greater than or equal to the outlet water temperature, proceed to step S204. If the inlet water temperature is less than the outlet water temperature, proceed to step S205.

[0136] S204. Determine if the coil temperature is higher than the ambient temperature.

[0137] If the inlet water temperature of the heat pump unit is greater than or equal to the outlet water temperature, it is determined that the current operating status does not match the preset operating mode, i.e., the current operating status does not match the preset heating mode. This indicates that there may be an abnormality in the four-way valve reversal. The coil temperature is then checked to determine if it is greater than the ambient temperature. The difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversal. If the coil temperature is greater than the ambient temperature, S206 is executed; if the coil temperature is less than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversal, and S202 is re-executed.

[0138] S205. Determine whether the difference between the return gas temperature and the coil temperature is greater than the preset third threshold.

[0139] If the inlet water temperature of the heat pump unit is lower than the outlet water temperature, in order to further confirm whether there is an abnormality in the four-way valve reversal, it is necessary to determine this step by using the difference between the return air temperature and the coil temperature. Therefore, if the inlet water temperature of the heat pump unit is lower than the outlet water temperature, it is determined whether the difference between the return air temperature and the coil temperature is greater than a preset third threshold. For example, the preset third threshold can be set to 20℃. If the difference between the return air temperature and the coil temperature is greater than the preset third threshold, then S204 is executed; if the difference between the return air temperature and the coil temperature is less than or equal to the preset third threshold, then it is determined that there is no abnormality in the four-way valve reversal, and then S202 is re-executed.

[0140] S206, Perform feedback action.

[0141] Perform the feedback action, reset the number of judgments to zero, and execute S207.

[0142] S207. Determine whether the compressor frequency value is greater than or equal to the preset first threshold.

[0143] Based on the judgment result of S204, when the coil temperature is higher than the ambient temperature, a feedback action is executed: the judgment count is reset to zero, and the current compressor frequency value is obtained. This compressor frequency value is compared with a preset first threshold to determine whether the compressor frequency value is greater than or equal to the preset first threshold. For example, the preset first threshold can be set to 48 Hz. When the compressor frequency value is less than the preset first threshold, S208 is executed. When the compressor frequency value is greater than or equal to the preset first threshold, S209 is executed.

[0144] S208. Adjust the compressor frequency value to the preset first threshold.

[0145] When the compressor frequency value is less than the preset first threshold, the compressor frequency value is adjusted to the preset first threshold and S209 is executed.

[0146] When the compressor frequency value is greater than or equal to the preset first threshold, the current compressor frequency value is maintained and S209 is executed.

[0147] S209. Perform the four-way valve reversal and restart operation.

[0148] When the compressor frequency value is greater than or equal to a preset first threshold, a four-way valve reversing and restarting operation is performed. For example, this can be achieved by energizing the four-way valve for 10 seconds and then de-energizing it. After completing the four-way valve reversing and restarting operation, step S210 is executed.

[0149] S210, Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold number.

[0150] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is greater than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 8 counts. If the count exceeds the preset threshold, step S215 is executed. If the count is less than or equal to the preset threshold, step S211 is executed.

[0151] S211. Determine whether the inlet water temperature is greater than or equal to the outlet water temperature.

[0152] Determine if the inlet water temperature of the heat pump unit is greater than or equal to the outlet water temperature. If the inlet water temperature is greater than or equal to the outlet water temperature, execute S212. If the inlet water temperature is less than the outlet water temperature, execute S213.

[0153] S212. Determine if the coil temperature is higher than the ambient temperature.

[0154] If the inlet water temperature of the heat pump unit is greater than or equal to the outlet water temperature, it is determined that the current operating status does not match the preset operating mode, i.e., the current operating status does not match the preset heating mode. This indicates that there may be an abnormality in the four-way valve reversal. The coil temperature is then checked to determine if it is greater than the ambient temperature. The difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversal. If the coil temperature is greater than the ambient temperature, step S214 is executed; if the coil temperature is less than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversal, and step S210 is re-executed.

[0155] S213. Determine whether the difference between the return gas temperature and the coil temperature is greater than the preset third threshold.

[0156] If the inlet water temperature of the heat pump unit is lower than the outlet water temperature, in order to further confirm whether there is an abnormality in the four-way valve reversal, it is necessary to determine this step by using the difference between the return gas temperature and the coil temperature. Therefore, if the inlet water temperature of the heat pump unit is lower than the outlet water temperature, it is determined whether the difference between the return gas temperature and the coil temperature is greater than a preset third threshold. For example, the preset third threshold can be set to 20℃. If the difference between the return gas temperature and the coil temperature is greater than the preset third threshold, then S212 is executed; if the difference between the return gas temperature and the coil temperature is less than or equal to the preset third threshold, then it is determined that there is no abnormality in the four-way valve reversal, and S210 is re-executed.

[0157] S214. The unit has stopped operating, indicating a four-way valve reversing fault.

[0158] According to the judgment result of S212, if the coil temperature is higher than the ambient temperature, it is determined that the four-way valve is abnormally switching. In this case, the operation of the heat pump unit needs to be stopped, and a fault in the four-way valve switching will be indicated so that the four-way valve can be replaced.

[0159] S215, Terminate judgment.

[0160] If the number of judgments exceeds a preset threshold, such as more than 8 times, it is considered that there is no abnormality in the four-way valve switching and that there will be no abnormality in the four-way valve switching in subsequent operation, so the judgment is terminated.

[0161] As described above, when the heat pump unit is operating in heating mode, after the compressor starts, a preliminary judgment is made on whether there is an abnormality in the four-way valve reversing based on a comprehensive comparison of the inlet water temperature, outlet water temperature, return gas temperature, coil temperature, and ambient temperature. If an abnormality is initially determined to be present in the four-way valve, a four-way valve reversing restart operation is performed to eliminate the abnormality that can be recovered by restarting the four-way valve. Then, a final judgment is made on whether there is an abnormality in the four-way valve reversing based on a comprehensive comparison of the inlet water temperature, outlet water temperature, return gas temperature, coil temperature, and ambient temperature. This improves the accuracy of four-way valve reversing abnormality detection and reduces the overall failure rate of the heat pump unit.

[0162] Figure 4 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in a cooling mode, provided in an embodiment of this application. (Refer to...) Figure 4 The specific methods for detecting abnormal switching of the four-way valve include:

[0163] S301. After the compressor starts for the preset time, the number of judgments is reset.

[0164] When the heat pump unit is running in cooling mode, after the compressor starts for a preset time, for example, 3 minutes after starting, the number of judgments will be reset to zero and S302 will be executed.

[0165] S302, Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold.

[0166] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is less than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 8 counts. If the count exceeds the preset threshold, step S315 is executed. If the count is less than or equal to the preset threshold, step S303 is executed.

[0167] S303. Determine whether the inlet water temperature is less than or equal to the outlet water temperature.

[0168] Determine if the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature. If the inlet water temperature is less than or equal to the outlet water temperature, execute S304. If the inlet water temperature is greater than the outlet water temperature, execute S305.

[0169] S304. Determine if the coil temperature is lower than the ambient temperature.

[0170] If the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature, it is determined that the current operating status does not match the preset operating mode, i.e., the current operating status does not match the preset cooling mode. This indicates that there may be an abnormality in the four-way valve reversing. The coil temperature is then checked to see if it is lower than the ambient temperature. The difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversing. If the coil temperature is lower than the ambient temperature, S306 is executed; if the coil temperature is greater than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversing, and S302 is re-executed.

[0171] S305. Determine whether the difference between the return gas temperature and the antifreeze pipe temperature is greater than the preset fourth threshold.

[0172] If the inlet water temperature of the heat pump unit is higher than the outlet water temperature, in order to further confirm whether there is an abnormality in the four-way valve reversal, it is necessary to determine this step by using the difference between the return gas temperature and the antifreeze pipe temperature. Therefore, if the inlet water temperature of the heat pump unit is higher than the outlet water temperature, it is determined whether the difference between the return gas temperature and the antifreeze pipe temperature is greater than a preset fourth threshold. For example, the preset fourth threshold can be set to 20℃. If the difference between the return gas temperature and the antifreeze pipe temperature is greater than the preset fourth threshold, then S304 is executed; if the difference between the return gas temperature and the antifreeze pipe temperature is less than or equal to the preset fourth threshold, then it is determined that there is no abnormality in the four-way valve reversal, and then S302 is re-executed.

[0173] S306, Perform feedback action.

[0174] Perform the feedback action, reset the number of judgments to zero, and execute S307.

[0175] S307. Determine whether the compressor frequency value is greater than or equal to the preset first threshold.

[0176] Based on the judgment result of S304, when the coil temperature is lower than the ambient temperature, a feedback action is executed: the judgment count is reset to zero, and the current compressor frequency value is obtained. This compressor frequency value is compared with a preset first threshold to determine whether the compressor frequency value is greater than or equal to the preset first threshold. For example, the preset first threshold can be set to 48 Hz. When the compressor frequency value is less than the preset first threshold, S308 is executed. When the compressor frequency value is greater than or equal to the preset first threshold, S309 is executed.

[0177] S308. Adjust the compressor frequency value to the preset first threshold.

[0178] When the compressor frequency value is less than the preset first threshold, the compressor frequency value is adjusted to the preset first threshold and S309 is executed.

[0179] When the compressor frequency value is greater than or equal to the preset first threshold, the current compressor frequency value is maintained and S309 is executed.

[0180] S309. Perform a four-way valve reversal and restart operation.

[0181] When the compressor frequency value is greater than or equal to a preset first threshold, a four-way valve reversing and restarting operation is performed. For example, this can be achieved by energizing the four-way valve for 10 seconds and then de-energizing it. After completing the four-way valve reversing and restarting operation, step S310 is executed.

[0182] S310. Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold.

[0183] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is less than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 8 counts. If the count exceeds the preset threshold, step S315 is executed. If the count is less than or equal to the preset threshold, step S311 is executed.

[0184] S311. Determine whether the inlet water temperature is less than or equal to the outlet water temperature.

[0185] Determine if the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature. If the inlet water temperature is less than or equal to the outlet water temperature, execute S312. If the inlet water temperature is greater than the outlet water temperature, execute S313.

[0186] S312. Determine if the coil temperature is lower than the ambient temperature.

[0187] If the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature, it is determined that the current operating status does not match the preset operating mode, i.e., the current operating status does not match the preset cooling mode. This indicates that there may be an abnormality in the four-way valve reversal. The coil temperature is then checked to determine if it is lower than the ambient temperature. The difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversal. If the coil temperature is lower than the ambient temperature, S314 is executed; if the coil temperature is greater than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversal, and S310 is re-executed.

[0188] S313. Determine whether the difference between the return gas temperature and the antifreeze pipe temperature is greater than the preset fourth threshold.

[0189] If the inlet water temperature of the heat pump unit is higher than the outlet water temperature, further confirmation of whether there is an abnormality in the four-way valve reversal requires a step-by-step determination using the difference between the return gas temperature and the antifreeze pipe temperature. Therefore, if the inlet water temperature of the heat pump unit is higher than the outlet water temperature, it is determined whether the difference between the return gas temperature and the antifreeze pipe temperature is greater than a preset fourth threshold. For example, the preset fourth threshold can be set to 20℃. If the difference between the return gas temperature and the antifreeze pipe temperature is greater than the preset fourth threshold, then S312 is executed; if the difference between the return gas temperature and the antifreeze pipe temperature is less than or equal to the preset fourth threshold, then it is assumed that there is no abnormality in the four-way valve reversal, and S310 is re-executed.

[0190] S314. The unit has stopped operating, indicating a four-way valve reversing fault.

[0191] According to the judgment result of S312, if the coil temperature is lower than the ambient temperature, it is determined that the four-way valve is abnormally switching. In this case, the operation of the heat pump unit needs to be stopped, and a fault in the four-way valve switching will be indicated so that the four-way valve can be replaced.

[0192] S315, Terminate judgment.

[0193] If the number of judgments exceeds a preset threshold, such as more than 8 times, it is considered that there is no abnormality in the four-way valve switching and that there will be no abnormality in the four-way valve switching in subsequent operation, so the judgment is terminated.

[0194] As described above, when the heat pump unit is operating in cooling mode, after the compressor starts, a preliminary judgment is made on whether there is an abnormality in the four-way valve reversing based on a comprehensive comparison of the inlet water temperature, outlet water temperature, return gas temperature, antifreeze pipe temperature, coil temperature, and ambient temperature. If an abnormality is initially determined in the four-way valve, a four-way valve reversing restart operation is performed to eliminate the abnormality that can be recovered by restarting the four-way valve. Then, a final judgment is made on whether there is an abnormality in the four-way valve reversing based on a comprehensive comparison of the inlet water temperature, outlet water temperature, return gas temperature, antifreeze pipe temperature, coil temperature, and ambient temperature. This improves the accuracy of four-way valve reversing abnormality detection and reduces the overall failure rate of the heat pump unit.

[0195] Figure 5 This is a flowchart of a method for detecting abnormal reversing of a four-way valve in defrosting mode, provided in an embodiment of this application. (Refer to...) Figure 5 The specific methods for detecting abnormal switching of the four-way valve include:

[0196] S401. After the defrost mode starts for a preset time, the number of judgments and the defrost base number are reset.

[0197] When the heat pump unit is running in defrost mode, after a preset time after entering defrost mode, for example, 1 minute after entering defrost mode, the number of judgments and the defrost base number will be reset to zero, and S402 will be executed.

[0198] S402, Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold.

[0199] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is less than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 4 counts. If the count exceeds the preset threshold, step S413 is executed. If the count is less than or equal to the preset threshold, step S403 is executed.

[0200] It should be noted that in defrost mode, the unit's operation changes faster than in heating or cooling modes. Therefore, the preset number of defrost cycles is set less than the corresponding preset number of cycles for heating or cooling modes. For example, the preset number of cycles for heating or cooling modes is set to 8, while the preset number of cycles for defrost mode is set to 4.

[0201] S403. Determine whether the inlet water temperature is less than or equal to the outlet water temperature.

[0202] Determine if the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature. If the inlet water temperature is less than or equal to the outlet water temperature, execute S404. If the inlet water temperature is greater than the outlet water temperature, execute S402.

[0203] S404. Increase the defrost base by 1, and determine whether the defrost base is greater than 2.

[0204] If the inlet water temperature is less than or equal to the outlet water temperature, it is determined to be an abnormal defrost. The defrost base number is then increased by 1, and it is determined whether the defrost base number is greater than 2. If the defrost base number is less than or equal to 2, S402 is executed again; if the defrost base number is greater than 2, S405 is executed.

[0205] S405. Determine if the coil temperature is lower than the ambient temperature.

[0206] If the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature, it is determined that the current operating state is not normal defrosting, and the defrosting base value is increased by 1. When the defrosting base value exceeds a certain value (e.g., exceeding 2), it indicates that there may be an abnormality in the four-way valve reversal. The coil temperature is then checked to determine if it is lower than the ambient temperature, and the difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversal. If the coil temperature is lower than the ambient temperature, S406 is executed; if the coil temperature is greater than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversal, and S402 is re-executed.

[0207] S406, Perform feedback action.

[0208] Perform the feedback action, reset the number of judgments and the defrost baseline to zero, and execute S407.

[0209] When the heat pump unit is in defrost mode, the compressor frequency value is generally a fixed preset second threshold, such as 70 Hz. After the feedback action is executed, the current compressor frequency value is maintained and S407 is executed.

[0210] S407, Perform the four-way valve reversal and restart operation.

[0211] Maintain the compressor frequency value equal to the preset second threshold and perform a four-way valve reversing restart operation. For example, this can be achieved by energizing the four-way valve for 10 seconds and then de-energizing it. After completing the four-way valve reversing restart operation, execute step S408.

[0212] S408. Increment the number of judgments by 1, and determine whether the number of judgments is greater than a preset threshold number.

[0213] Every preset time interval (e.g., 15 seconds), the system checks whether the inlet water temperature is less than or equal to the outlet water temperature, increments the count by 1, and checks whether the count exceeds a preset threshold. For example, the preset threshold is set to 4 counts. If the count exceeds the preset threshold, step S413 is executed. If the count is less than or equal to the preset threshold, step S409 is executed.

[0214] It should be noted that in defrost mode, the unit's operation changes faster than in heating or cooling modes. Therefore, the preset number of defrost cycles is set less than the corresponding preset number of cycles for heating or cooling modes. For example, the preset number of cycles for heating or cooling modes is set to 8, while the preset number of cycles for defrost mode is set to 4.

[0215] S409. Determine whether the inlet water temperature is less than or equal to the outlet water temperature.

[0216] Determine if the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature. If the inlet water temperature is less than or equal to the outlet water temperature, execute S410. If the inlet water temperature is greater than the outlet water temperature, execute S408.

[0217] S410, increment the defrost base by 1, and determine whether the defrost base is greater than 2.

[0218] If the inlet water temperature is less than or equal to the outlet water temperature, it is determined to be an abnormal defrost. The defrost base number is then increased by 1, and it is determined whether the defrost base number is greater than 2. If the defrost base number is less than or equal to 2, S408 is executed again; if the defrost base number is greater than 2, S411 is executed.

[0219] S411. Determine if the coil temperature is lower than the ambient temperature.

[0220] If the inlet water temperature of the heat pump unit is less than or equal to the outlet water temperature, it is determined that the current operating state is not normal defrosting, and the defrosting base value is increased by 1. When the defrosting base value exceeds a certain value (e.g., exceeding 2), it indicates that there may be an abnormality in the four-way valve reversal. The coil temperature is then checked to determine if it is lower than the ambient temperature, and the difference between the coil temperature and the ambient temperature is used to further determine if there is an abnormality in the four-way valve reversal. If the coil temperature is lower than the ambient temperature, S412 is executed; if the coil temperature is greater than or equal to the ambient temperature, it is assumed that there is no abnormality in the four-way valve reversal, and S408 is re-executed.

[0221] S412, Unit stops operating, indicating a four-way valve reversing fault.

[0222] According to the judgment result of S411, if the coil temperature is lower than the ambient temperature, it is determined that the four-way valve is abnormally switching. In this case, the operation of the heat pump unit needs to be stopped, and a four-way valve switching fault will be indicated so that the four-way valve can be replaced.

[0223] S413, Terminate judgment.

[0224] If the number of judgments exceeds a preset threshold, such as more than 4 times, it is considered that there is no abnormality in the four-way valve switching and that there will be no abnormality in the four-way valve switching in subsequent operation, so the judgment is terminated.

[0225] As described above, when the heat pump unit is operating in cooling mode, after the compressor starts, a preliminary judgment is made on whether there is an abnormality in the four-way valve reversal based on a comprehensive comparison of the inlet water temperature, outlet water temperature, coil temperature, and ambient temperature. If an abnormality is initially determined in the four-way valve, a four-way valve reversal restart operation is performed to eliminate the abnormality that can be recovered by restarting the four-way valve. Then, a final judgment is made on whether there is an abnormality in the four-way valve reversal based on a comprehensive comparison of the inlet water temperature, outlet water temperature, coil temperature, and ambient temperature. This improves the accuracy of four-way valve reversal abnormality detection, reduces the false alarm rate of the heat pump unit, and reduces the number of times the heat pump unit malfunctions due to false alarms, thereby reducing the overall failure rate of the heat pump unit.

[0226] As described above, when the difference between the inlet water temperature and the difference between the coil ambient temperature are within the first parameter range, and the unit operating parameters are within the second parameter range, the four-way valve is reversed and restarted. The difference between the inlet water temperature and the difference between the coil ambient temperature is then re-evaluated to see if they are within the first parameter range. If the difference between the inlet and outlet water temperatures and the ambient temperature are still within the first parameter range, the four-way valve is judged to be abnormal. By employing the aforementioned technical means, when the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range, and the unit operating parameters are within the second parameter range, a re-judgment is performed after a four-way valve reversal and restart operation. This avoids the problem of low accuracy in four-way valve anomaly detection. The second judgment after the four-way valve reversal and restart avoids classifying recoverable four-way valve misalignment as anomaly. Only when the result of the second judgment after the four-way valve reversal and restart still shows that the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range is the four-way valve reversal anomaly finally determined. This improves the accuracy of four-way valve reversal anomaly detection, reduces the false alarm rate of the heat pump unit, and reduces the number of operational errors caused by false alarms, thereby lowering the overall failure rate of the heat pump unit.

[0227] Based on the above embodiments, Figure 6 This is a schematic diagram of a four-way valve reversing abnormality detection device provided in an embodiment of this application. (Reference) Figure 6 The four-way valve reversing abnormality detection device provided in this embodiment specifically includes: a temperature acquisition module 21, a first judgment module 22, a second judgment module 23, and a third judgment module 24.

[0228] Among them, the temperature acquisition module 21 is used to acquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current working mode;

[0229] The first judgment module 22 is used to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode;

[0230] The second judgment module 23 is used to obtain the unit operating parameters of the heat pump unit if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range, and to determine whether the unit operating parameters are within the second parameter range corresponding to the current working mode.

[0231] The third judgment module 24 is used to perform a four-way valve reversal restart operation if the unit operating parameters are within the second parameter range, and to re-determine whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current working mode. If the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, the four-way valve reversal is judged to be abnormal.

[0232] Furthermore, the unit operating parameters include the compressor frequency value; the third judgment module 24 includes a first restart unit, a first temperature acquisition unit, a first judgment unit, and a second judgment unit;

[0233] The first restart unit is used to energize the four-way valve for a preset time and then de-energize it when the heat pump unit is in heating or cooling mode and the compressor frequency value is greater than or equal to a preset first threshold, so as to realize the reversal and restart of the four-way valve.

[0234] Alternatively, when the heat pump unit is in heating or cooling mode, if the compressor frequency is less than the preset first threshold, the compressor frequency will be adjusted to the preset first threshold, and then the four-way valve will be energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve.

[0235] The first temperature acquisition unit is used to reacquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment in the current heating or cooling mode.

[0236] The first judgment unit is used to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode.

[0237] The second judgment unit is used to determine that the four-way valve switching is abnormal if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range.

[0238] Furthermore, the unit operating parameters include the compressor frequency value; the third judgment module 24 includes a second restart unit, a second temperature acquisition unit, a third judgment unit, and a fourth judgment unit;

[0239] The second restart unit is used to energize the four-way valve for a preset time and then de-energize it when the heat pump unit is in defrost mode and the compressor frequency value is equal to the preset second threshold, so as to realize the reversal restart of the four-way valve.

[0240] The second temperature acquisition unit is used to reacquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current defrosting mode.

[0241] The third judgment unit is used to determine whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode.

[0242] The fourth judgment unit is used to determine that the four-way valve switching is abnormal if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the first parameter range.

[0243] Furthermore, the inlet and outlet water temperature difference is the difference between the inlet water temperature and the outlet water temperature, and the coil ambient temperature difference is the difference between the coil temperature and the ambient temperature.

[0244] The first judgment module 22 includes a fifth judgment unit, a sixth judgment unit, and a seventh judgment unit;

[0245] The fifth judgment unit is used to determine whether the temperature difference between the inlet and outlet water is greater than or equal to zero when the heat pump unit is in heating mode.

[0246] The sixth judgment unit is used to determine whether the ambient temperature difference of the coil is greater than zero if the temperature difference between the inlet and outlet water is greater than or equal to zero.

[0247] The seventh judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the first parameter range if the coil environment temperature difference is greater than zero.

[0248] Furthermore, the first judgment module 22 also includes a third temperature acquisition unit, a first calculation unit, an eighth judgment unit, and a ninth judgment unit;

[0249] The third temperature acquisition unit is used to acquire the return air temperature and coil temperature of the heat pump unit if the temperature difference between the inlet and outlet water is less than zero.

[0250] The first calculation unit is used to obtain the return gas coil temperature difference value based on the difference between the return gas temperature and the coil temperature.

[0251] The eighth judgment unit is used to determine whether the ambient temperature difference of the coil is greater than zero if the temperature difference value of the return air coil is greater than the preset third threshold.

[0252] The ninth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the first parameter range if the coil environment temperature difference is greater than zero.

[0253] Furthermore, the first judgment module 22 also includes a tenth judgment unit, an eleventh judgment unit, and a twelfth judgment unit;

[0254] The tenth judgment unit is used to determine whether the temperature difference between the inlet and outlet water is less than or equal to zero when the heat pump unit is in cooling mode or defrosting mode.

[0255] The eleventh judgment unit is used to determine whether the ambient temperature difference of the coil is less than zero if the temperature difference between the inlet and outlet water is less than or equal to zero.

[0256] The twelfth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode if the coil environment temperature difference is less than zero.

[0257] Furthermore, the first judgment unit also includes a fourth temperature acquisition unit, a second calculation unit, a thirteenth judgment unit, and a fourteenth judgment unit;

[0258] The fourth temperature acquisition unit is used to acquire the return air temperature and antifreeze pipe temperature of the heat pump unit if the temperature difference between the inlet and outlet water is greater than zero.

[0259] The second calculation unit is used to obtain the return gas antifreeze temperature difference value based on the difference between the return gas temperature and the antifreeze pipe temperature.

[0260] The thirteenth judgment unit is used to determine whether the temperature difference of the coil environment is less than zero if the return air antifreeze temperature difference is greater than the preset fourth threshold.

[0261] The fourteenth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode if the coil environment temperature difference is less than zero.

[0262] Furthermore, the device also includes a fourth judgment module and a fifth judgment module;

[0263] The fourth judgment module is used to re-judge whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the first parameter range at preset time intervals if the inlet and outlet water temperature difference and the coil environment temperature difference are not within the first parameter range corresponding to the current working mode.

[0264] The fifth judgment module is used to determine if the inlet / outlet water temperature difference and the coil ambient temperature difference are both outside the range of the first parameter after a preset number of judgments. In this case, the four-way valve switching is not abnormal, and the judgment process terminates.

[0265] As described above, when the difference between the inlet water temperature and the difference between the coil ambient temperature are within the first parameter range, and the unit operating parameters are within the second parameter range, the four-way valve is reversed and restarted. The difference between the inlet water temperature and the difference between the coil ambient temperature is then re-evaluated to see if they are within the first parameter range. If the difference between the inlet and outlet water temperatures and the ambient temperature are still within the first parameter range, the four-way valve is judged to be abnormal. By employing the aforementioned technical means, when the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range, and the unit operating parameters are within the second parameter range, a re-judgment is performed after a four-way valve reversal and restart operation. This avoids the problem of low accuracy in four-way valve anomaly detection. The second judgment after the four-way valve reversal and restart avoids classifying recoverable four-way valve misalignment as anomaly. Only when the result of the second judgment after the four-way valve reversal and restart still shows that the inlet water temperature difference and the coil ambient temperature difference are within the first parameter range is the four-way valve reversal anomaly finally determined. This improves the accuracy of four-way valve reversal anomaly detection, reduces the false alarm rate of the heat pump unit, and reduces the number of operational errors caused by false alarms, thereby lowering the overall failure rate of the heat pump unit.

[0266] The four-way valve reversing abnormality detection device provided in this application embodiment can be used to execute the four-way valve reversing abnormality detection method provided in the above embodiment, and has corresponding functions and beneficial effects.

[0267] This application provides a four-way valve reversing abnormality detection device, referring to... Figure 7 The four-way valve directional change anomaly detection device includes: a processor 31, a memory 32, a communication module 33, an input device 34, and an output device 35. The number of processors and the number of memories in the four-way valve directional change anomaly detection device can be one or more. The processor, memory, communication module, input device, and output device of the four-way valve directional change anomaly detection device can be connected via a bus or other means.

[0268] The memory 32, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the four-way valve switching anomaly detection method described in any embodiment of this application (e.g., the temperature acquisition module, first judgment module, second judgment module, and third judgment module in the four-way valve switching anomaly detection device). The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a function; the data storage area may store data created based on the use of the device, etc. Furthermore, the memory may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0269] The communication module 33 is used for data transmission.

[0270] The processor 31 executes various functional applications and data processing of the device by running software programs, instructions and modules stored in the memory, thereby realizing the above-mentioned four-way valve swivel abnormality detection method.

[0271] Input device 34 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the device. Output device 35 may include display devices such as a display screen.

[0272] The four-way valve reversing anomaly detection device provided above can be used to execute the four-way valve reversing anomaly detection method provided in the above embodiments, and has the corresponding functions and beneficial effects.

[0273] This application embodiment also provides a storage medium storing computer-executable instructions. When executed by a computer processor, these computer-executable instructions are used to perform a four-way valve reversing anomaly detection method. The four-way valve reversing anomaly detection method includes: acquiring the inlet and outlet water temperature difference and the coil ambient temperature difference of a heat pump unit under the current operating mode; determining whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within a first parameter range corresponding to the current operating mode; if the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, acquiring the heat pump unit's operating parameters and determining whether the unit's operating parameters are within a second parameter range corresponding to the current operating mode; if the unit's operating parameters are within the second parameter range, performing a four-way valve reversing restart operation and re-determining whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range corresponding to the current operating mode; if the inlet and outlet water temperature difference and the coil ambient temperature difference are within the first parameter range, determining that the four-way valve reversing is abnormal.

[0274] Storage medium – any type of memory device or storage device. The term “storage medium” is intended to include: mounting media, such as CD-ROM, floppy disk, or magnetic tape devices; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM, etc.; non-volatile memory, such as flash memory, magnetic media (e.g., hard disk or optical storage); registers or other similar types of memory elements, etc. Storage medium may also include other types of memory or combinations thereof. Furthermore, storage medium may reside in a first computer system in which the program is executed, or it may reside in a different second computer system connected to the first computer system via a network (such as the Internet). The second computer system can provide program instructions to the first computer for execution. The term “storage medium” can include two or more storage media residing in different locations (e.g., in different computer systems connected via a network). Storage medium may store program instructions (e.g., specifically implemented as a computer program) executable by one or more processors.

[0275] Of course, the computer-executable instructions stored in the storage medium provided in the embodiments of this application are not limited to the four-way valve reversing abnormality detection method as described above, but can also execute related operations in the four-way valve reversing abnormality detection method provided in any embodiment of this application.

[0276] The four-way valve reversing anomaly detection device, storage medium, and four-way valve reversing anomaly detection equipment provided in the above embodiments can execute the four-way valve reversing anomaly detection method provided in any embodiment of this application. For technical details not described in detail in the above embodiments, please refer to the four-way valve reversing anomaly detection method provided in any embodiment of this application.

[0277] The above description is merely a preferred embodiment and the technical principles employed in this application. This application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions that can be made by those skilled in the art will not depart from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the claims.

Claims

1. A method for detecting abnormal switching of a four-way valve, characterized in that, include: Obtain the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current operating mode; Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode; If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the unit operating parameters of the heat pump unit are obtained, and it is determined whether the unit operating parameters are within the range of the second parameter corresponding to the current working mode. If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated to see if they are within the range of the first parameter corresponding to the current operating mode. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal. The step of determining whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode includes: when the heat pump unit is in cooling mode or defrosting mode, determining whether the temperature difference between the inlet and outlet water is less than or equal to zero. When the heat pump unit is in cooling mode, after determining whether the inlet and outlet water temperature difference is less than or equal to zero, the following steps are taken: if the inlet and outlet water temperature difference is greater than zero, the return gas temperature and the antifreeze pipe temperature of the heat pump unit are obtained, and the return gas antifreeze temperature difference is obtained based on the difference between the return gas temperature and the antifreeze pipe temperature; if the return gas antifreeze temperature difference is greater than a preset fourth threshold, the coil environment temperature difference is determined to be less than zero; if the coil environment temperature difference is less than zero, the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode.

2. The method according to claim 1, characterized in that, The unit operating parameters include the compressor frequency value; If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated to see if they are within the range of the first parameter corresponding to the current operating mode. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal, including: When the heat pump unit is in heating or cooling mode, if the compressor frequency value is greater than or equal to a preset first threshold, the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve. Alternatively, when the heat pump unit is in heating or cooling mode, if the compressor frequency value is less than a preset first threshold, the compressor frequency value is adjusted to the preset first threshold, and then the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve. Reacquire the inlet and outlet water temperature difference and coil ambient temperature difference of the heat pump unit under the current heating or cooling mode. Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode; If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the four-way valve is determined to be abnormally switching.

3. The method according to claim 1, characterized in that, The unit operating parameters include the compressor frequency value; If the unit's operating parameters are within the range of the second parameter, a four-way valve reversing and restarting operation is performed, and the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated to see if they are within the range of the first parameter corresponding to the current operating mode. If the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal, including: When the heat pump unit is in defrost mode, if the compressor frequency value is equal to the preset second threshold, the four-way valve is energized for a preset time and then de-energized to achieve the reversal and restart of the four-way valve. Reacquire the inlet and outlet water temperature difference and coil ambient temperature difference of the heat pump unit under the current defrosting mode; Determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode; If the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, then the four-way valve is determined to be abnormally switching.

4. The method according to claim 1, characterized in that, The inlet and outlet water temperature difference is the difference between the inlet water temperature and the outlet water temperature, and the coil ambient temperature difference is the difference between the coil temperature and the ambient temperature. The step of determining whether the inlet / outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current working mode includes: When the heat pump unit is in heating mode, determine whether the temperature difference between the inlet and outlet water is greater than or equal to zero. If the temperature difference between the inlet and outlet water is greater than or equal to zero, then determine whether the temperature difference of the coil environment is greater than zero. If the temperature difference of the coil environment is greater than zero, then the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter.

5. The method according to claim 4, characterized in that, When the heat pump unit is in heating mode, determining whether the inlet and outlet water temperature difference is greater than or equal to zero includes: If the temperature difference between the inlet and outlet water is less than zero, then the return air temperature and coil temperature of the heat pump unit are obtained. The return gas coil temperature difference value is obtained based on the difference between the return gas temperature and the coil temperature. If the temperature difference value of the return air coil is greater than the preset third threshold, then determine whether the temperature difference value of the coil environment is greater than zero. If the temperature difference of the coil environment is greater than zero, then the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter.

6. The method according to claim 1, characterized in that, When the heat pump unit is in cooling mode or defrost mode, determining whether the inlet and outlet water temperature difference is less than or equal to zero includes: If the temperature difference between the inlet and outlet water is less than or equal to zero, then determine whether the temperature difference between the coil environment and the coil is less than zero. If the temperature difference of the coil environment is less than zero, then whether the temperature difference between the inlet and outlet water and the temperature difference of the coil environment are within the range of the first parameter corresponding to the current working mode.

7. The method according to claim 1, characterized in that, After determining whether the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter corresponding to the current working mode, the process includes: If the inlet / outlet water temperature difference and the coil ambient temperature difference are not within the range of the first parameter corresponding to the current working mode, the inlet / outlet water temperature difference and the coil ambient temperature difference are re-evaluated every preset time interval to determine whether they are within the range of the first parameter. If the results of the judgments exceed the preset number of times and the results of the judgments are all outside the range of the first parameter, then there is no abnormality in the switching of the four-way valve and the judgment is terminated.

8. A four-way valve reversing abnormality detection device, characterized in that, include: The temperature acquisition module is used to acquire the temperature difference between the inlet and outlet water of the heat pump unit and the temperature difference between the coil environment under the current operating mode. The first judgment module is used to determine whether the inlet and outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode; The second judgment module is used to obtain the unit operating parameters of the heat pump unit if the temperature difference between the inlet and outlet water and the temperature difference between the coil environment are within the range of the first parameter, and to determine whether the unit operating parameters are within the range of the second parameter corresponding to the current working mode. The third judgment module is used to perform a four-way valve reversing and restarting operation if the unit operating parameters are within the range of the second parameter, and to re-determine whether the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter corresponding to the current working mode. If the inlet and outlet water temperature difference and the coil ambient temperature difference are within the range of the first parameter, the four-way valve reversing is determined to be abnormal. The first judgment module further includes a tenth judgment unit, which is used to determine whether the temperature difference between the inlet and outlet water is less than or equal to zero when the heat pump unit is in cooling mode or defrosting mode. The first judgment unit also includes a fourth temperature acquisition unit, a second calculation unit, a thirteenth judgment unit, and a fourteenth judgment unit; The fourth temperature acquisition unit is used to acquire the return air temperature and antifreeze pipe temperature of the heat pump unit if the temperature difference between the inlet and outlet water is greater than zero. The second calculation unit is used to obtain the return air antifreeze temperature difference value based on the difference between the return air temperature and the antifreeze pipe temperature; The thirteenth judgment unit is used to determine whether the coil environment temperature difference is less than zero if the return air antifreeze temperature difference value is greater than the preset fourth threshold. The fourteenth judgment unit is used to determine whether the inlet / outlet water temperature difference and the coil environment temperature difference are within the range of the first parameter corresponding to the current working mode if the coil environment temperature difference is less than zero.

9. A four-way valve reversing abnormality detection device, characterized in that, include: Memory and one or more processors; The memory is used to store one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the method as described in any one of claims 1-7.

10. A storage medium for storing computer-executable instructions, characterized in that, The computer-executable instructions, when executed by a processor, are used to perform the method as described in any one of claims 1-7.

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