A fault detection method and device, air conditioning equipment and storage medium

Abstract

Embodiments of the present application disclose a fault detection method, the method comprising: if an air conditioning device receives an exit instruction for indicating the air conditioning device to exit a reference working mode, in response to the exit instruction, controlling m target switch valves in an off state to switch to a conductive state; the reference working mode comprises a refrigeration multi-temperature working mode or a heating multi-temperature working mode, the target switch valve is used to control the flow of refrigerant flowing through an evaporator in an indoor unit of the air conditioning device connected to the target switch valve; determining a target working mode to which the air conditioning device needs to switch from the reference working mode; after controlling the air conditioning device to switch to the target working mode for a first preset time length, acquiring temperature parameters of n evaporators to obtain a first temperature set; based on the first temperature set, determining a fault state of each target switch valve in the m target switch valves. Embodiments of the present application also disclose a fault detection device, an air conditioning device and a storage medium.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a fault detection method, device, air conditioning equipment and storage medium. Background Technology

[0002] With the rapid development of science and technology, air conditioning equipment has become increasingly sophisticated and widely used. To ensure a better user experience, air conditioning systems in heating or cooling modes have evolved from simply blowing cold or hot air directly to dividing the indoor heat exchanger into at least two parts. This allows the air conditioner to simultaneously output air at different temperatures, reducing the possibility of user discomfort. Currently, this division of the indoor heat exchanger into at least two parts is mainly achieved by using normally open solenoid valves on the corresponding sections. These valves control the flow of refrigerant, allowing for the output of air at different temperatures and improving the user experience. However, when the normally open solenoid valve is de-energized and in its normally open state, a significant pressure difference exists between its inlet and outlet. If the pressure at the inlet is too high, the spring of the normally open solenoid valve may not retract after power is cut off, preventing the air from flowing between the inlet and outlet and causing a system malfunction.

[0003] Currently, there is no effective detection method for the above-mentioned fault, which prevents the fault of the solenoid valve spring from retracting from being eliminated in a timely manner.

[0004] Application content

[0005] To address the aforementioned technical problems, this application aims to provide a fault detection method, device, air conditioning equipment, and storage medium. It solves the problem that a stuck solenoid valve controlling the refrigerant's passage through the evaporator in current multi-temperature air conditioning equipment can easily lead to system failures. The application proposes a fault detection method for detecting a stuck solenoid valve, reducing the probability of system failures caused by a stuck solenoid valve.

[0006] The technical solution of this application is implemented as follows:

[0007] In a first aspect, a fault detection method, the method comprising:

[0008] If the air conditioning equipment receives an exit command to instruct the air conditioning equipment to exit the reference operating mode, in response to the exit command, it controls m target switching valves that are in the closed state to switch to the open state; wherein, the reference operating mode includes a cooling multi-temperature operating mode or a heating multi-temperature operating mode, the target switching valve is used to control the flow rate of refrigerant flowing through the evaporator in the indoor unit of the air conditioning equipment connected to the target switching valve, and m is an integer greater than or equal to 1;

[0009] Determine the target operating mode from which the air conditioning equipment needs to switch from the reference operating mode;

[0010] After controlling the air conditioning equipment to switch to the target working mode for a first preset time, the temperature parameters of n evaporators are obtained to obtain a first temperature set; where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target switching valves;

[0011] Based on the first temperature set, the fault state of each of the m target switching valves is determined.

[0012] Secondly, a fault detection device, the device comprising: a control unit, a first determining unit, an acquisition unit, and a second determining unit; wherein:

[0013] The control unit is configured to, in response to an exit command indicating that the air conditioning equipment should exit the reference operating mode, control m target switching valves that are in the closed state to switch to the open state; wherein, the reference operating mode includes a cooling multi-temperature operating mode or a heating multi-temperature operating mode, the target switching valve is configured to control the flow rate of refrigerant flowing through the evaporator in the indoor unit of the air conditioning equipment connected to the target switching valve, and m is an integer greater than or equal to 1;

[0014] The first determining unit is used to determine the target operating mode that the air conditioning equipment needs to switch from the reference operating mode to;

[0015] The acquisition unit is used to control the air conditioning equipment to switch to the target working mode for a first preset time, and then acquire the temperature parameters of n evaporators to obtain a first temperature set; where n is an integer greater than m, and the n evaporators include the evaporators corresponding to m target switching valves;

[0016] The second determining unit is used to determine the fault state of each of the m target switching valves based on the first temperature set.

[0017] Thirdly, an air conditioning device, the device comprising: an indoor unit, an outdoor unit, and a fault detection device as described above.

[0018] Fourthly, a storage medium storing a fault detection program, which, when executed by a processor, implements the steps of the fault detection method as described in any of the preceding claims.

[0019] In this embodiment, if the air conditioning device receives an exit command instructing it to exit the reference operating mode, it responds to the exit command by controlling m target switching valves that are in the conducting state to switch to the conducting state. It then determines the target operating mode from which the air conditioning device needs to switch from the reference operating mode. After a first preset time period for switching to the target operating mode, it acquires the temperature parameters of n evaporators to obtain a first temperature set. Based on the first temperature set, it determines the fault state of each of the m target switching valves. Thus, when the air conditioning device receives an exit command to exit the reference operating mode while operating in the reference mode, it switches the m target switching valves that are in the closed state to the conducting state. After switching the air conditioning device to the target operating mode for a period of time, it collects the temperature parameters of n evaporators. Based on the temperature parameters of the n evaporators, it performs fault analysis on the m target switching valves. This solves the problem in current multi-temperature air conditioning devices where the solenoid valve controlling the refrigerant to pass through the evaporator is stuck, easily leading to system failure. It proposes a fault detection method for detecting stuck solenoid valves, reducing the probability of system failure due to stuck solenoid valves. Attached Figure Description

[0020] Figure 1 Flowchart of the fault detection method provided in the embodiments of this application Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the circuit structure connection of an air conditioning device provided in an embodiment of this application;

[0022] Figure 3 Flowchart of the fault detection method provided in the embodiments of this application Figure 2 ;

[0023] Figure 4 Flowchart of the fault detection method provided in the embodiments of this application Figure 3 ;

[0024] Figure 5 A flowchart illustrating an application embodiment of a fault detection method provided in this application;

[0025] Figure 6 This is a schematic diagram illustrating the application of an air conditioning device according to an embodiment of this application;

[0026] Figure 7 This is a schematic diagram illustrating an application scenario provided in an embodiment of this application.

[0027] Figure 8 Flowchart of another application embodiment of the fault detection method provided in this application;

[0028] Figure 9This is a schematic diagram illustrating the application of another air conditioning device provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram illustrating another application scenario provided by an embodiment of this application;

[0030] Figure 11 A flowchart illustrating an application embodiment of another fault detection method provided in this application;

[0031] Figure 12 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application;

[0032] Figure 13 This is a schematic diagram of the structure of an air conditioning device provided in an embodiment of this application. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0034] The embodiments of this application provide a fault detection method, referring to... Figure 1 As shown, the method is applied to air conditioning equipment, and the method includes the following steps:

[0035] Step 101: If the air conditioning equipment receives an exit command to indicate that the air conditioning equipment should exit the reference working mode, respond to the exit command and control the m target switch valves that are in the closed state to switch to the open state.

[0036] The reference operating mode includes a cooling multi-temperature operating mode or a heating multi-temperature operating mode. The target switching valve is used to control the flow rate of refrigerant flowing through the evaporator of the indoor unit of the air conditioning equipment connected to the target switching valve. m is an integer greater than or equal to 1.

[0037] In this embodiment of the application, in order to ensure the user experience, the air conditioning equipment can simultaneously output cold air or hot air at different temperatures when cooling or heating. This can be achieved by replacing one evaporator with at least two evaporators in the indoor unit of the air conditioning equipment, and installing a switch valve on the evaporator to control the refrigerant passing through each evaporator, so that air at different temperatures can be output through each evaporator.

[0038] The exit command received by the air conditioning unit can be obtained by pressing a physical or virtual button on the indoor unit, sent by a remote control device such as a remote controller, or sent by a controller such as a smart home central control device or a smart mobile terminal device. A multi-temperature cooling mode means that in cooling mode, the indoor unit can simultaneously output at least two temperatures of cool air. Similarly, a multi-temperature heating mode means that in heating mode, the indoor unit can simultaneously output at least two temperatures of hot air. In both multi-temperature cooling and multi-temperature heating modes, the lowest temperature air output is typically positioned at the top of the space. This prevents hot air from rising, ensuring a cool head and warm body temperature for the user, thus improving the user experience.

[0039] When the air conditioning unit is currently operating in either the cooling multi-temperature mode or the heating multi-temperature mode, if it receives an exit command from the user indicating that it must exit the reference mode, it controls m target switching valves that are currently closed to switch to the open state. This allows the air conditioning unit to exit the reference mode and switch to the target mode, ceasing the output of multiple cold or hot airflows. The target switching valve is a valve that controls refrigerant flow; specifically, it can be a solenoid valve, such as a normally open or normally closed solenoid valve. When the target switching valve is a normally open or normally closed solenoid valve, its open / closed state can be controlled by whether or not it is supplied with power. m can be the total number of switching valves in the air conditioning unit used to control the flow of refrigerant through the evaporator. It should be noted that at least one evaporator is not equipped with a switching valve for controlling refrigerant flow. m can also refer to the number of on / off valves in an air conditioning unit used to control the flow rate of refrigerant through the evaporator. In this case, it could mean that all evaporators in the air conditioning unit are connected to the on / off valves used to control the flow rate of refrigerant, or it could mean that some evaporators in the air conditioning unit are connected to the on / off valves used to control the flow rate of refrigerant.

[0040] Step 102: Determine the target operating mode from which the air conditioning equipment needs to switch from the reference operating mode.

[0041] In this embodiment, the target operating mode can be specified in the exit command, or it can be an operating mode that the air conditioning device corresponds to before switching to the reference operating mode, which is not specified in the exit command. Alternatively, it can be an operating mode predicted and analyzed based on the actual application scenario. The specific target operating mode can be determined according to the actual application scenario.

[0042] Step 103: After the air conditioning equipment is switched to the target working mode for a first preset time, obtain the temperature parameters of n evaporators to obtain the first temperature set.

[0043] Where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target on / off valves.

[0044] In this embodiment, the first preset duration can be an empirical value obtained from numerous experiments, such as the duration during which a significant temperature change occurs between an evaporator with refrigerant flowing through it and an evaporator without refrigerant flowing through it. After controlling m target switching valves to the on state for the first preset duration, the temperature parameters of n evaporators are collected by a temperature acquisition device, such as a temperature sensor, installed on the evaporator to obtain a first temperature set, which includes n temperature parameters.

[0045] Step 104: Based on the first temperature set, determine the fault state of each of the m target switching valves.

[0046] In this embodiment, the first temperature set is analyzed to determine the fault state of each of the m target switching valves. In some application scenarios, a comparative analysis of the reference operating mode and the target operating mode can be performed to obtain the analysis results. Then, the first temperature set is analyzed based on the analysis results to determine the fault state of each of the m target switching valves. The fault state of the target switching valve includes two states: fault present and fault-free. Fault present refers to the state where the target switching valve is stuck.

[0047] In this embodiment, if the air conditioning unit receives an exit command instructing it to exit the reference operating mode, it responds to the exit command by controlling m target switching valves that are in the conducting state to switch to the conducting state. After determining the target operating mode from which the air conditioning unit needs to switch from the reference operating mode, it controls the air conditioning unit to switch to the target operating mode for a first preset time, acquires the temperature parameters of n evaporators, obtains a first temperature set, and determines the fault state of each of the m target switching valves based on the first temperature set. Thus, when the air conditioning unit receives an exit command to exit the reference operating mode while operating in the reference operating mode, it switches the m target switching valves that are in the closed state to the conducting state, and after switching the air conditioning unit to the target operating mode for a period of time, it collects the temperature parameters of n evaporators. Based on the temperature parameters of n evaporators, it performs fault analysis on the m target switching valves. This solves the problem that the solenoid valve controlling the refrigerant to pass through the evaporator in current multi-temperature air conditioning units is easily stuck, leading to system failure. A fault detection method for detecting stuck solenoid valves is proposed, reducing the probability of system failure due to stuck solenoid valves.

[0048] Based on the foregoing embodiments, embodiments of this application provide a fault detection method, which is applied to an air conditioning device, and the method includes the following steps:

[0049] Step 201: If the air conditioning equipment receives an exit command to indicate that the air conditioning equipment should exit the reference working mode, respond to the exit command and control the m target switching valves that are in the closed state to switch to the open state.

[0050] The reference operating mode includes a cooling multi-temperature operating mode or a heating multi-temperature operating mode. The target switching valve is used to control the flow rate of refrigerant flowing through the evaporator of the indoor unit of the air conditioning equipment connected to the target switching valve. m is an integer greater than or equal to 1.

[0051] In this embodiment of the application, the user sends an exit command to the air conditioner via the air conditioner remote control device to instruct the air conditioner to exit the reference working mode, such as an exit command to exit the multi-temperature cooling working mode. After receiving the exit command, the air conditioner responds to the exit command and controls m target switching valves that are in the closed state to switch to the open state so that the refrigerant can pass through the target switching valves.

[0052] For example, refer to Figure 2 The diagram shown is a circuit structure schematic of an air conditioning device provided in this application. Figure 2 In the circuit diagram of the air conditioning equipment shown, the indoor unit of the air conditioning equipment includes two evaporators, namely evaporator 1 and evaporator 2. Evaporator 1 is connected to a solenoid valve, while evaporator 2 is not connected to a solenoid valve, which helps to reduce production costs. Figure 2 After receiving an exit command indicating that the air conditioning unit should exit the reference operating mode, the corresponding target switching valve is... Figure 2 The solenoid valve connected to evaporator 1 has a corresponding m value of 1. At this time, the control... Figure 2 The solenoid valve connected to evaporator 1 switches from the closed state to the open state. Among them, Figure 2 The solenoid valve connected to the evaporator 1 can be a normally open solenoid valve. When the normally open solenoid valve is in the closed state, it can be controlled by energizing the normally open solenoid valve, that is, by providing working power.

[0053] Step 202: Determine the target operating mode from which the air conditioning equipment needs to switch from the reference operating mode.

[0054] In this embodiment, if the exit command indicates a target operating mode to which the device needs to switch from the reference operating mode, the air conditioning device parses the exit command and determines the target operating mode. If the exit command does not indicate a target operating mode to which the device needs to switch from the reference operating mode, the air conditioning device determines that the operating mode it is in before switching to the reference operating mode is the target operating mode. In some application scenarios, the air conditioning device can also predict the target operating mode based on the current environment and outdoor environmental parameters such as temperature and / or weather forecast parameters.

[0055] Step 203: After controlling the air conditioning equipment to switch to the target working mode for the first preset time, obtain the temperature parameters of n evaporators to obtain the first temperature set.

[0056] Where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target on / off valves.

[0057] In the embodiments of this application, control Figure 2 After the switch valve in the middle is switched to the conduction state and the air conditioning equipment is switched to the target working mode for a first preset time, such as 3 minutes, the temperature parameter 1 of the evaporator 1 is collected by the temperature sensor 1 and the temperature parameter 2 of the evaporator 2 is collected by the temperature sensor 2, so as to obtain a first temperature set including temperature parameter 1 and temperature parameter 2.

[0058] Step 204: Based on the first temperature set, determine the fault state of each of the m target switching valves.

[0059] In this embodiment of the application, the first temperature set is analyzed to determine the fault state of each target switching valve.

[0060] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 3 As shown, when step 204 is implemented by determining the fault state of each of the m target switching valves based on the reference operating mode, the target operating mode, and the first temperature set, it can be achieved by steps 204a to 204c:

[0061] Step 204a: Determine the first operating mode of the air conditioning equipment's compressor when the air conditioning equipment is operating in the reference operating mode.

[0062] In this embodiment, since the reference operating mode is a multi-temperature cooling operating mode or a multi-temperature heating operating mode, the first operating mode of the compressor corresponds to the cooling operating mode or the heating operating mode.

[0063] Step 204b: Determine the second operating mode of the compressor when the air conditioning equipment is operating in the target operating mode.

[0064] When the air conditioning equipment is operating in the target working mode, the compressor is in operation.

[0065] In this embodiment, the target operating mode of the air conditioning equipment is the operating mode when the compressor is running, that is, the corresponding target operating mode is cooling mode or heating mode, and the corresponding second operating mode of the compressor is cooling operation mode or heating operation mode. It should be noted that when the air conditioning equipment is in fan-operated mode, the compressor is stopped, that is, it is not in operation.

[0066] Step 204c: Based on the first operating mode, the second operating mode, and the first temperature set, determine the fault state of each of the m target switching valves.

[0067] In this embodiment of the application, the first operating mode and the second operating mode are analyzed to obtain the analysis results. Based on the analysis results, the first temperature set is analyzed to determine the fault state of each target switching valve.

[0068] Based on the foregoing embodiments, in other embodiments of this application, step 204c can be implemented by steps a11 to a12:

[0069] Step a11: If the first operating mode is different from the second operating mode, determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to m target switching valves.

[0070] In this embodiment, the first operating mode and the second operating mode are different, which can be understood as the refrigerant flow direction of the air conditioning equipment being different. For example, the first operating mode is a cooling operating mode and the second operating mode is a heating operating mode, or the first operating mode is a heating operating mode and the second operating mode is a cooling operating mode. Only the first temperature set needs to be analyzed to determine the fault state of each target switching valve. Specifically, this can be achieved by determining the first temperature parameters of nm evaporators (excluding the temperature parameters of the evaporators corresponding to the m target switching valves) from the first temperature set, thus obtaining nm first temperature parameters. It should be noted that the nm evaporators (excluding the temperature parameters of the evaporators corresponding to the m target switching valves) may or may not be connected to the switching valves.

[0071] Step a12: Based on nm first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, determine the fault status of the corresponding target switching valve.

[0072] Each of the second temperature parameters belongs to the first temperature set.

[0073] In this embodiment of the application, the first temperature parameters of nm are analyzed and processed to obtain the processing results. Then, the processing results are compared and analyzed with the second temperature parameters of the evaporator corresponding to each target switching valve to determine the fault state of the corresponding target switching valve.

[0074] Based on the foregoing embodiments, in other embodiments of this application, step a12 can be implemented by steps a121 to a123:

[0075] Step a121: Determine the first temperature analysis parameters based on nm first temperature parameters.

[0076] In the embodiments of this application, the method for determining the first temperature analysis parameter based on nm first temperature parameters can be implemented by averaging, or it can be determined by identifying the temperature parameter that appears most frequently among nm first temperature parameters. The specific method can be determined according to the number of nm in the actual application scenario.

[0077] For example, the first temperature parameter corresponding to evaporator 2 is used as the first temperature analysis parameter.

[0078] Step a122: Determine the first absolute value of the first target difference between the first temperature analysis parameter and each second temperature parameter.

[0079] In this embodiment of the application, the first absolute value = |first temperature analysis parameter - each second temperature parameter|, where || is the sign of taking the first absolute value.

[0080] For example, since the first temperature parameter of evaporator 2 is used as the first temperature analysis parameter, it can be determined that the first absolute value = |first temperature analysis parameter - each second temperature parameter| = |first temperature parameter of evaporator 2 - second temperature parameter of evaporator 1|.

[0081] Step a123: Based on each first absolute value, determine the fault state of the corresponding target switching valve.

[0082] In the embodiments of this application, each first absolute value is analyzed to determine the fault state of the target switching valve corresponding to each first absolute value.

[0083] For example, by analyzing the first absolute value of the difference between the first temperature parameter of evaporator 2 and the second temperature parameter of evaporator 1, the fault status of the switching valve connected to evaporator 1 can be determined.

[0084] Based on the foregoing embodiments, in this embodiment of the application, step a123 can be implemented by steps b101 to b102:

[0085] Step b101: From the m target switching valves, determine at least one switching valve whose first absolute value is greater than or equal to a first preset threshold, and obtain a reference switching valve. The first preset threshold is a temperature change threshold obtained from a large number of experiments. The reference switching valve is each of the m target switching valves, that is, the first absolute value of each target switching valve is compared and analyzed with the first preset threshold to determine the fault state of each target switching valve.

[0086] In this embodiment of the application, if the reference switching valve cannot be determined from the m target switching valves, it indicates that all m target switching valves are fault-free.

[0087] Step b102: Determine that the fault status of the reference switch valve is faulty.

[0088] In this embodiment of the application, if the first absolute value of a target switching valve is greater than or equal to a first preset threshold, the fault state of the target switching valve is determined to be faulty; if the first absolute value of a target switching valve is less than the first preset threshold, the fault state of the target switching valve is determined to be fault-free.

[0089] Based on the foregoing embodiments, in other embodiments of this application, step a123 can also be implemented by steps b103 to b107:

[0090] Step b103: Determine at least one switching valve from the m target switching valves whose first absolute value is greater than or equal to a first preset threshold, and obtain a reference switching valve.

[0091] Step b104: Perform the target operation on the reference switch valve.

[0092] The target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch it to the open state.

[0093] In this embodiment, the target operation is to control the reference switch valve to switch to the closed state and then switch it to the open state. The purpose is to give the reference switch valve a pulse voltage impact to resolve the fault of the reference switch valve being stuck.

[0094] Step b105: After performing the target operation on the reference switch valve for the first preset time, the step of obtaining the temperature parameters of n evaporators is executed again to obtain the first temperature set.

[0095] In this embodiment, the first preset duration is an empirical value obtained from numerous experiments. In some application scenarios, the first preset duration can also be an empirical value set by the user based on the actual scenario. After identifying a faulty reference switch valve, the reference switch valve is quickly switched to the closed state and then back to the open state. After performing this operation for the first preset duration, step 203, "obtaining the temperature parameters of n evaporators to obtain the first temperature set," is executed again for cyclical subsequent analysis.

[0096] Step b106: If the first absolute value of the reference switch valve is greater than or equal to the first preset threshold, then repeat the step of performing the target operation on the reference switch valve.

[0097] Step b107: If the number of times the reference switch valve performs the target operation is less than or equal to the preset number, and the first absolute value of the reference switch valve is greater than the first preset threshold, the fault state of the reference switch valve is determined to be fault-free.

[0098] In this embodiment, the preset number of times can be an empirical value obtained from numerous experiments, or it can be set by the user according to actual needs; for example, the preset number of times can be set to 5 times. The number of times the reference switch performs the target operation is also statistically analyzed to facilitate subsequent analysis. For example, if the number of times the reference switch valve performs the target operation is less than or equal to the preset number, and if it is determined that the first absolute value of the reference switch valve is less than the first preset threshold, the fault state of the reference switch valve is determined to be fault-free, and the reference switch valve can remain in the conducting state. In this way, by controlling the target operation of the reference switch valve to quickly turn on and immediately close, the fault problem of the reference switch valve is actively resolved, reducing the possibility of the reference switch valve being stuck and improving the user experience of the air conditioning equipment. When the fault state of the reference switch valve is determined to be fault-free, the reference switch valve is kept in the closed state.

[0099] Based on the foregoing embodiments, in other embodiments of this application, step a123 can also be implemented by steps b108 to b1011:

[0100] Step b108: Determine at least one switching valve from the m target switching valves whose first absolute value is greater than or equal to a first preset threshold, and obtain a reference switching valve.

[0101] Step b109: Perform the target operation on the reference switch valve.

[0102] The target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch it to the open state.

[0103] Step b1010: After performing the target operation on the reference switch valve for the first preset time, collect the temperature parameters of n1 evaporators to obtain the second temperature set.

[0104] Among them, n1 evaporators include the evaporators corresponding to the reference switching valves, and n1 is greater than the number of reference switching valves.

[0105] Step b1011: Determine the fault state of the reference switching valve based on the second temperature set.

[0106] In this embodiment of the application, the second temperature set is analyzed to determine the fault state of the reference switching valve.

[0107] Based on the foregoing embodiments, in other embodiments of this application, the air conditioning device is further used to perform steps b1012 to b1015:

[0108] Step b1012: If the number of times the reference switch valve performs the target operation is greater than the preset number, and the first absolute value of the reference switch valve is greater than or equal to the first preset threshold, control the compressor of the air conditioning equipment to stop working, and open the electronic expansion valve of the air conditioning equipment to the preset opening degree.

[0109] Step b1013: After the compressor has stopped working for a second preset time, perform a setting operation on the reference switch valve.

[0110] The setting operation is the operation of controlling the reference switch valve to switch to the on state.

[0111] In this embodiment, the second preset duration can be obtained based on numerous experiments, ensuring pressure balance across the reference switch valve. When the target operation on the reference switch valve is repeated more than the preset number of times, it indicates that the target operation cannot rule out the problem of the reference switch valve being stuck. At this time, the compressor of the air conditioning unit is paused for the second preset duration to allow the pressure across the reference switch valve to balance. Then, the throttling device of the air conditioning unit is controlled to be at its maximum opening. After the pressure of the air conditioning system is balanced, the reference switch valve is controlled to be closed, i.e., the opening of the reference switch valve is controlled to be 0, ensuring rapid pressure balance across the reference switch valve.

[0112] Step b1014: After the compressor of the air conditioning equipment has been running for a third preset time, collect the fourth temperature parameter of the evaporator corresponding to the reference switch valve, and the fifth temperature parameter of x evaporators outside the evaporator corresponding to the reference switch valve.

[0113] Where x is an integer greater than or equal to 1.

[0114] In this embodiment, the third preset duration is an empirical value obtained from numerous experiments. It can be the same as or different from the first preset duration, and can be determined based on actual circumstances. After the reference switch valve is in the closed state for the third preset duration, the fourth temperature parameter of the evaporator connected to the reference switch valve is collected by the temperature sensor installed on the reference switch valve.

[0115] Step b1015: Based on the fourth temperature parameter and x fifth temperature parameters, determine the fault state of the reference switching valve.

[0116] In this embodiment of the application, based on x fifth temperature parameters, a fifth temperature analysis parameter is determined, and the absolute value of the difference between the fourth temperature parameter and the fifth temperature analysis parameter is calculated. If the absolute value of the difference between the fourth temperature parameter and the fifth temperature analysis parameter is greater than a first preset threshold, the fault state of the reference switching valve is determined to be faulty. If the absolute value of the difference between the fourth temperature parameter and the fifth temperature analysis parameter is less than the first preset threshold, the fault state of the reference switching valve is determined to be fault-free.

[0117] Based on the foregoing embodiments, in other embodiments of this application, step 204c can also be implemented by steps a13 to a14:

[0118] Step a13: If the first operating mode is the same as the second operating mode, obtain the temperature parameters of n evaporators when the exit command is received, and obtain the third temperature set.

[0119] In this embodiment, the first operating mode and the second operating mode being the same means that the refrigerant flow direction of the air conditioning equipment is the same. For example, the compressor is in cooling operation mode in the reference operating mode and also in cooling operation mode in the target operating mode; or the compressor is in heating operation mode in the reference operating mode and also in heating operation mode in the target operating mode. When the first operating mode and the second operating mode are the same, upon receiving the exit command, a third temperature set is obtained based on the n temperature parameters collected from the n evaporators. That is, the temperature parameters stored in the third temperature set are the temperature parameters of the n evaporators before the m target switching valves are in the open state.

[0120] Step a14: Based on the first temperature set and the third temperature set, determine the fault state of each of the m target switching valves.

[0121] In this embodiment of the application, the temperature parameters in the first temperature set and the third temperature set are analyzed to determine the fault state of each of the m target switching valves.

[0122] Based on the foregoing embodiments, in other embodiments of this application, step a14 can be implemented by steps a141 to a146:

[0123] Step a141: From the third temperature set, determine the nm sixth temperature parameters, excluding the temperature parameters of the evaporators corresponding to the m target switching valves.

[0124] Step a142: Based on nm sixth temperature parameters and the seventh temperature parameter of the evaporator corresponding to each target switching valve, determine the first reference temperature parameter of the corresponding target switching valve.

[0125] In the embodiments of this application, the implementation process of step a142 can refer to the implementation process of step b21, and will not be described in detail here.

[0126] Step a143: From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporators corresponding to m target switching valves.

[0127] Step a144: Based on nm first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, determine the second reference temperature parameter of the corresponding target switching valve.

[0128] In the embodiments of this application, the implementation process of step a144 can refer to the implementation process of step b21, and will not be described in detail here.

[0129] Step a145: Determine the first target difference between each first reference temperature parameter and the second reference temperature parameter.

[0130] In this embodiment of the application, the difference between the first reference temperature parameter and the corresponding second reference temperature parameter for each target switching valve is calculated to obtain the first target difference value for each target switching valve.

[0131] Step a146: Based on each first target difference, determine the fault state of the corresponding target switching valve.

[0132] In the embodiments of this application, each first target difference is analyzed to determine the fault state of each target switching valve.

[0133] Based on the foregoing embodiments, in other embodiments of this application, step a142 can be implemented by steps c11 to c12:

[0134] Step c11: Determine the second temperature analysis parameters based on the nm sixth temperature parameters.

[0135] In the embodiments of this application, the implementation process of step c11 can refer to the implementation process of determining the first temperature analysis parameter in step a121, and will not be described in detail here.

[0136] Step c12: Determine the absolute value of the difference between the second temperature analysis parameter and the seventh temperature parameter of the evaporator corresponding to each target switching valve, and obtain the first reference temperature parameter of the corresponding target switching valve.

[0137] Based on the foregoing embodiments, in other embodiments of this application, step a146 can be implemented by steps d101 to d102:

[0138] Step d101: Determine at least one switching valve from the m target switching valves whose first target difference is less than or equal to a second preset threshold, and obtain a reference switching valve.

[0139] Step d102: Determine that the fault status of the reference switching valve is faulty.

[0140] In this embodiment of the application, if the first target difference of the reference switching valve is greater than the second preset threshold, the fault state of the reference switching valve is determined to be fault-free.

[0141] Based on the foregoing embodiments, in other embodiments of this application, step a146 can also be implemented by steps d103 to d107:

[0142] Step d103: Determine at least one switching valve from the m target switching valves whose first target difference is less than or equal to the second preset threshold, and obtain the reference switching valve.

[0143] Step d104: Perform the target operation on the reference switch valve.

[0144] The target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch it to the open state.

[0145] Step d105: After performing the target operation on the reference switch valve for the first preset time, execute the step of obtaining the temperature parameters of n evaporators again to obtain the first temperature set.

[0146] Step d106: If the first target difference of the reference switch valve is less than or equal to the second preset threshold, then repeat the step of performing the target operation on the reference switch valve.

[0147] Step d107: If the number of times the reference switch valve performs the target operation is less than or equal to the preset number, and the first target difference of the reference switch valve is greater than the second preset threshold, the fault status of the reference switch valve is determined to be fault-free.

[0148] Based on the foregoing embodiments, in other embodiments of this application, step a146 can also be implemented by steps d108 to d1011:

[0149] Step d108: Determine at least one switching valve from the m target switching valves whose first target difference is less than or equal to the second preset threshold, and obtain the reference switching valve.

[0150] Step d109: Perform the target operation on the reference switch valve.

[0151] The target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch it to the open state.

[0152] Step d1010: After performing the target operation on the reference switch valve for the first preset time, collect the temperature parameters of n1 evaporators to obtain the second temperature set.

[0153] Among them, n1 evaporators include the evaporators corresponding to the reference switching valves, and n1 is greater than the number of reference switching valves.

[0154] Step d1011: Determine the fault state of the reference switching valve based on the second temperature set.

[0155] Based on the foregoing embodiments, in other embodiments of this application, the air conditioning device is further used to perform steps d1012 to d1015 to achieve the following:

[0156] Step d1012: If the number of times the reference switch valve performs the target operation is greater than the preset number, and the first target difference of the reference switch valve is less than or equal to the first preset threshold, control the compressor of the air conditioning equipment to stop working, and open the electronic expansion valve of the air conditioning equipment to the preset opening degree.

[0157] Step d1013: After the compressor has stopped working for a second preset time, perform the setting operation on the reference switch valve.

[0158] The setting operation is the operation of controlling the reference switch valve to switch to the on state.

[0159] Step d1014: After the compressor of the air conditioning equipment has been running for a third preset time, collect the fourth temperature parameter of the evaporator corresponding to the reference switch valve, and the fifth temperature parameter of x evaporators outside the evaporator corresponding to the reference switch valve.

[0160] Where x is an integer greater than or equal to 1.

[0161] Step d1015: Based on the fourth temperature parameter and x fifth temperature parameters, determine the fault state of the reference switching valve.

[0162] Based on the foregoing embodiments, in other embodiments of this application, steps b1011 and d1011 can be implemented by steps e11 to e14:

[0163] Step e11: From the second temperature set, determine x1 third temperature parameters, excluding the temperature parameters of the evaporator corresponding to the reference switching valve.

[0164] Step e12: Determine the third temperature analysis parameters based on x1 third temperature parameters.

[0165] In the embodiments of this application, the implementation process of step e12 can refer to the implementation process of step c11, and will not be repeated here.

[0166] Step e13: Determine the second absolute value of the first target difference between the third temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switching valve.

[0167] Step e14: If the second absolute value is greater than the first preset threshold, determine that the fault state of the reference switching valve is that a fault exists.

[0168] Based on the foregoing embodiments, in other embodiments of this application, step 204 may also be determined from step a11 ("determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to the m target switching valves"), steps a12, a121-a123, and b101-b102; or from step a11 ("determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to the m target switching valves"), steps a12, a121-a123, and b103-b107; or from step a11 ("determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to the m target switching valves"), steps a12, a121-a123, and b103-b107. The specific implementation process can be achieved through steps a12, a121-a123 and b108-b1011, or steps a111 including "determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to the m target switching valves", steps a12, a121-a123 and b103-b107, or steps a11 including "determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to the m target switching valves", steps a12, a121-a123 and b1012-b1015. The specific implementation process can be referred to the above description, and will not be elaborated here.

[0169] Based on the foregoing embodiments, in other embodiments of this application, step 204 may also be derived from step a13, which involves obtaining the temperature parameters of the n evaporators when the exit command is received, to obtain a third temperature set, steps a14, a141-a146, c11-c12, and d101-d102; or from step a13, which involves obtaining the temperature parameters of the n evaporators when the exit command is received, to obtain a third temperature set, steps a14, a141-a146, c11-c12, and d103-d107; or... This can be achieved by step a13, which involves obtaining the temperature parameters of n evaporators when the exit command is received, to obtain the third temperature set, and steps a14, a141-a146, c11-c12, and d108-d1011, or by step a13, which involves obtaining the temperature parameters of n evaporators when the exit command is received, to obtain the third temperature set, and steps a14, a141-a146, c11-c12, and d1012-d1015. The specific implementation process can be referred to the above description, and no specific limitations are made here.

[0170] Based on the foregoing embodiments, in other embodiments of this application, refer to... Figure 4 As shown, after the air conditioning equipment performs step 204, it is also used to perform steps 205 to 206:

[0171] Step 205: Determine the identification information of the target switching valve whose fault status is faulty.

[0172] In this embodiment of the application, the identification information of the target switching valve can be identity information used to uniquely identify the target switching valve, such as a sorting number corresponding to the order of sorting, or the serial number of the target switching valve, etc.

[0173] Step 206: Display fault message.

[0174] Among them, the fault indication information is used to indicate the identification information of the target switching valve whose fault status is faulty.

[0175] In this embodiment of the application, when it is determined that at least one target switching valve is in a faulty state, the identification information of at least one target switching valve is displayed to prompt the user that at least one target switching valve is faulty, so that the user can quickly locate the fault location and troubleshoot the fault, reduce the possibility of air conditioning equipment system failure, and improve the user experience.

[0176] Based on the foregoing embodiments, this application provides a Figure 2 The implementation process of the fault detection method corresponding to the exit from the dual-temperature cooling mode when the air conditioning equipment is in the dual-temperature cooling mode can be referred to. Figure 5 As shown, the air conditioning equipment's execution process specifically includes the following steps:

[0177] Step 301: Collect the temperature T11 of evaporator 1 and the temperature T21 of evaporator 2, and calculate T1 = |T11 - T21|.

[0178] Step 302: If the first instruction to exit the dual-temperature cooling mode is detected, determine the switching mode to which the air conditioning equipment will switch.

[0179] Step 303: If the working mode is switched to air supply mode, switch the air conditioning equipment to air supply mode, control the compressor to stop for a period of time t, and then disconnect the power supply to the normally open solenoid valve.

[0180] The value of t can be, for example, 1 minute.

[0181] Step 304: Keep the air conditioning unit in air supply mode.

[0182] When the air conditioning unit is in air supply mode, the compressor is in a stopped state.

[0183] Step 305: If the working mode is switched to cooling mode / dehumidification mode, switch the air conditioning equipment to cooling mode / dehumidification mode, control the compressor stop time t1, and disconnect the power supply of the normally open solenoid valve.

[0184] The value of t1 can be, for example, 1 minute. The value of t1 can be the same as or different from the value of t, depending on the actual situation.

[0185] Step 306: Start the compressor and run it in cooling / dehumidification mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T12 - T22|.

[0186] The value of t2 can be, for example, 10 minutes.

[0187] Step 307: Determine whether T2 is less than a1, or whether T1-T2 is greater than a2. If yes, proceed to step 308; otherwise, proceed to step 309.

[0188] Step 308: Maintain the current operating mode of the air conditioning equipment.

[0189] The current operating mode is cooling / dehumidification mode.

[0190] Step 309: Perform the target operation for the normally open solenoid valve.

[0191] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0192] Step 310: Count the number of times the target operation is executed, and determine whether the number is greater than n. If yes, proceed to step 311; otherwise, proceed to step 306.

[0193] The value of n can be 5.

[0194] Step 311: After the compressor stops for t3 hours, control the throttling device to open to its maximum degree.

[0195] The throttling device can be an electronic expansion valve. Correspondingly, controlling the throttling device to open to its maximum degree means controlling the electronic expansion valve to open to its maximum degree.

[0196] Step 312: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T13 - T23|.

[0197] The value of t4 is 3 minutes.

[0198] Step 313: Determine whether T3 is less than b1, or whether T1-T3 is greater than b2. If yes, proceed to step 308; otherwise, proceed to step 314.

[0199] Step 314: Alarm message indicates that the normally open solenoid valve has malfunctioned.

[0200] After the air conditioning equipment performs step 314, it can continue to operate in cooling / heating mode or revert to dual-temperature cooling mode.

[0201] Step 315: If the working mode is switched to heating mode, switch the air conditioning equipment to heating mode, control the compressor to stop for t1 time, and then disconnect the power supply to the normally open solenoid valve.

[0202] The value of t1 can be, for example, 3 minutes.

[0203] Step 316: Start the compressor and run it in heating mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T12 - T22|.

[0204] The value of t2 can be, for example, 10 minutes.

[0205] Step 317: Determine whether T2 is less than c1, or whether T1-T2 is greater than c2. If yes, proceed to step 318; otherwise, proceed to step 319.

[0206] Step 318: Maintain the current operating mode of the air conditioning equipment.

[0207] The current operating mode is heating mode.

[0208] Step 319: Perform the target operation for the normally open solenoid valve.

[0209] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0210] Step 320: Count the number of times the target operation is executed, and determine whether the number is greater than n. If yes, proceed to step 321; otherwise, proceed to step 316.

[0211] Step 321: After the compressor stops for t3 hours, control the throttling device to open to its maximum degree.

[0212] Step 322: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T13 - T23|.

[0213] Step 323: Determine whether T3 is less than d1, or whether T1-T3 is greater than d2. If yes, proceed to step 318; otherwise, proceed to step 324.

[0214] Here, a1, b1, c1, and d1 are thresholds, which can be the same or different. Similarly, a2, b2, c2, and d2 are thresholds, which can be the same or different, depending on the specific circumstances. a1 and a2 are usually different, b1 and b2 are usually different, c1 and c2 are usually different, and d1 and d2 are usually different.

[0215] Step 324: Alarm message: The normally open solenoid valve has malfunctioned.

[0216] After the air conditioning equipment executes step 324, it can continue to operate in cooling / heating mode or revert to dual-temperature cooling mode.

[0217] In this mode, the air conditioning unit enters a dual-temperature cooling operation. A schematic diagram of the refrigerant flow within the air conditioning unit can be found here. Figure 6 As shown in the diagram. A corresponding schematic diagram of the air output from the air conditioning unit can be found here. Figure 7 As shown, the air output from the upper layer of the air conditioning unit is cold air, while the air from the lower layer is not supplied with refrigerant to the evaporator 1 connected to the normally open solenoid valve due to the closure of the normally open solenoid valve. Therefore, the air output from the evaporator 1 is natural cool air.

[0218] Based on the foregoing embodiments, this application provides a Figure 2 The implementation process of the fault detection method corresponding to exiting the dual-temperature heating mode when the air conditioning equipment is in the dual-temperature heating mode can be referred to. Figure 8 As shown, the air conditioning equipment's execution process specifically includes the following steps:

[0219] Step 401: Collect the temperature T11 of evaporator 1 and the temperature T21 of evaporator 2, and calculate T1 = |T21 - T11|.

[0220] Step 402: If the first instruction to exit the dual-temperature heating mode is detected, determine the switching mode to which the air conditioning equipment will switch.

[0221] Step 403: If the working mode is switched to air supply mode, control the air conditioning equipment to switch to air supply mode, control the compressor to stop for a period of time t, and then disconnect the power supply to the normally open solenoid valve.

[0222] Step 404: Keep the air conditioning unit in air supply mode.

[0223] When the air conditioning unit is in air supply mode, the compressor is in a stopped state.

[0224] Step 405: If the working mode is switched to heating mode, control the air conditioning equipment to switch to heating mode, control the compressor to stop for t1 time, and disconnect the power supply to the normally open solenoid valve.

[0225] The value of t1 can be, for example, 1 minute.

[0226] Step 406: Start the compressor and run it in heating mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T22 - T12|.

[0227] The value of t2 can be, for example, 10 minutes.

[0228] Step 407: Determine whether T2 is less than e1, or whether T1-T2 is greater than e2. If yes, proceed to step 408; otherwise, proceed to step 409.

[0229] Step 408: Maintain the current operating mode of the air conditioning equipment.

[0230] The current operating mode is cooling / dehumidification mode.

[0231] Step 409: Perform the target operation for the normally open solenoid valve.

[0232] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0233] Step 410: Count the number of times the target operation is executed, and determine whether the count is greater than n. If yes, proceed to step 411; otherwise, proceed to step 406.

[0234] Step 411: After the compressor stops for t3 hours, control the throttling device to open to its maximum degree.

[0235] The value of t4 can be, for example, 3 minutes.

[0236] Step 412: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T23 - T13|.

[0237] Step 413: Determine whether T3 is less than f1, or whether T1-T3 is greater than f2. If yes, proceed to step 408; otherwise, proceed to step 414.

[0238] Step 414: Alarm message: The normally open solenoid valve has malfunctioned.

[0239] After the air conditioning equipment performs step 414, it can continue to operate in cooling / heating mode or revert to dual-temperature cooling mode.

[0240] Step 415: If the switching mode is cooling / dehumidification mode, switch the air conditioning equipment to cooling / dehumidification mode, control the compressor to stop for t1 time, and then disconnect the power supply to the normally open solenoid valve.

[0241] The value of t1 can be, for example, 3 minutes.

[0242] Step 416: Start the compressor and run it in cooling mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T22 - T12|.

[0243] The value of t2 can be, for example, 10 minutes.

[0244] Step 417: Determine whether T2 is less than g1, and whether T1-T2 is greater than g2. If yes, proceed to step 418; otherwise, proceed to step 419.

[0245] Step 418: Maintain the current operating mode of the air conditioning equipment.

[0246] The current operating mode is heating mode.

[0247] Step 419: Perform the target operation for the normally open solenoid valve.

[0248] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0249] Step 420: Count the number of times the target operation is executed, and determine whether the count is greater than n. If yes, proceed to step 421; otherwise, proceed to step 416.

[0250] Step 421: After the compressor stops for t3 hours, control the throttling device to open to its maximum degree.

[0251] The throttling control device can be an electronic expansion valve. Correspondingly, when controlling the throttling device to open to the maximum degree, the electronic expansion valve is controlled to open to the maximum degree.

[0252] Step 422: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T23 - T13|.

[0253] Step 423: Determine whether T3 is less than h1, or whether T1-T3 is greater than h2. If yes, proceed to step 418; otherwise, proceed to step 424.

[0254] Step 424: Alarm message: The normally open solenoid valve has malfunctioned.

[0255] After executing step 424, the air conditioning unit can continue in cooling / heating mode or revert to dual-temperature heating mode. Here, e1, f1, g1, and h1 are threshold values, which can be the same or different; e2, f2, g2, and h2 are threshold values, which can also be the same or different, depending on the specific circumstances. e1 and e2 are typically different, f1 and f2 are typically different, g1 and g2 are typically different, and h1 and h2 are typically different.

[0256] When the air conditioning unit is in heating dual-temperature operating mode, the corresponding refrigerant flow diagram can be found by referring to... Figure 9 As shown in the diagram. A corresponding schematic diagram of the air output from the air conditioning unit can be found here. Figure 10 As shown, the air output from the upper layer of the air conditioning unit is room temperature airflow, and the air output from the lower layer is hot air.

[0257] Based on the foregoing embodiments, this application provides a Figure 2 The implementation process of the fault detection method corresponding to exiting the dual-temperature heating mode when the air conditioning equipment is in the dual-temperature heating mode can be referred to. Figure 11 As shown, the air conditioning equipment's execution process specifically includes the following steps:

[0258] Step 501: Collect the temperature T11 of evaporator 1 and the temperature T21 of evaporator 2, and calculate T1 = |T21 - T11|.

[0259] Step 502: If the first instruction to exit the dual-temperature heating mode is detected, determine the switching mode to which the air conditioning equipment will switch.

[0260] Step 503: If the working mode is switched to air supply mode, control the air conditioning equipment to switch to air supply mode, control the compressor to stop for a period of time t, and then disconnect the power supply to the normally open solenoid valve.

[0261] Step 504: Keep the air conditioning unit in air supply mode.

[0262] When the air conditioning unit is in air supply mode, the compressor is in a stopped state.

[0263] Step 505: If the working mode is switched to heating mode, control the air conditioning equipment to switch to heating mode, control the compressor to stop for t1 time, and disconnect the power supply to the normally open solenoid valve.

[0264] The value of t1 can be, for example, 1 minute.

[0265] Step 506: Start the compressor and run it in heating mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T22 - T12|.

[0266] The value of t2 can be, for example, 10 minutes.

[0267] Step 507: Determine whether T1-T2 is greater than i. If yes, proceed to step 508; otherwise, proceed to step 509.

[0268] Step 508: Maintain the current operating mode of the air conditioning equipment.

[0269] The current operating mode is cooling / dehumidification mode.

[0270] Step 509: Perform the target operation for the normally open solenoid valve.

[0271] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0272] Step 510: Count the number of times the target operation is executed, and determine whether the count is greater than n. If yes, proceed to step 510; otherwise, proceed to step 506.

[0273] Step 511: After the compressor stops for t4 hours, control the throttling device to open to its maximum degree.

[0274] The value of t4 can be, for example, 3 minutes.

[0275] Step 512: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T23 - T13|.

[0276] Step 513: Determine whether T1-T3 is greater than j. If yes, proceed to step 508; otherwise, proceed to step 514.

[0277] Step 514: Alarm message: The normally open solenoid valve has malfunctioned.

[0278] After the air conditioning equipment performs step 514, it can continue to operate in cooling / heating mode or revert to dual-temperature cooling mode.

[0279] Step 515: If the switching mode is cooling / dehumidification mode, switch the air conditioning equipment to cooling / dehumidification mode, control the compressor to stop for t1 time, and then disconnect the power supply to the normally open solenoid valve.

[0280] The value of t1 can be, for example, 3 minutes.

[0281] Step 516: Start the compressor and run it in cooling mode for t2 hours. Then, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2, and calculate T2 = |T22 - T12|.

[0282] The value of t2 can be, for example, 10 minutes.

[0283] Step 517: Determine if T2 is less than k. If yes, proceed to step 518; otherwise, proceed to step 519.

[0284] Step 518: Maintain the current operating mode of the air conditioning equipment.

[0285] The current operating mode is heating mode.

[0286] Step 519: Perform the target operation for the normally open solenoid valve.

[0287] The target operation is to quickly de-energize the normally open solenoid valve after it is energized.

[0288] Step 520: Count the number of times the target operation is executed, and determine whether the count is greater than n. If yes, proceed to step 521; otherwise, proceed to step 516.

[0289] Step 521: After the compressor stops for t3 hours, control the throttling device to open to its maximum degree.

[0290] The throttling control device can be an electronic expansion valve. Correspondingly, when controlling the throttling device to open to the maximum degree, the electronic expansion valve is controlled to open to the maximum degree.

[0291] Step 522: After the normally open solenoid valve is de-energized for t4 hours, collect the temperature T13 of evaporator 1 and the temperature T23 of evaporator 2, and calculate T3 = |T23 - T13|.

[0292] Step 523: Determine if T3 is less than l. If yes, proceed to step 518; otherwise, proceed to step 524.

[0293] Step 524: Alarm message: The normally open solenoid valve has malfunctioned.

[0294] After executing step 524, the air conditioning unit can continue in cooling / heating mode or revert to dual-temperature heating mode. Here, i, j, k, and l are threshold values, which can be the same or different, depending on the specific circumstances.

[0295] It should be noted that the descriptions of the same steps and contents as in other embodiments in this embodiment can be found in the descriptions in other embodiments, and will not be repeated here.

[0296] In this embodiment, if the air conditioning unit receives an exit command instructing it to exit the reference operating mode, it responds to the exit command by controlling m target switching valves that are in the conducting state to switch to the conducting state. After determining the target operating mode from which the air conditioning unit needs to switch from the reference operating mode, it controls the air conditioning unit to switch to the target operating mode for a first preset time, acquires the temperature parameters of n evaporators, obtains a first temperature set, and determines the fault state of each of the m target switching valves based on the first temperature set. Thus, when the air conditioning unit receives an exit command to exit the reference operating mode while operating in the reference operating mode, it switches the m target switching valves that are in the closed state to the conducting state, and after switching the air conditioning unit to the target operating mode for a period of time, it collects the temperature parameters of n evaporators. Based on the temperature parameters of n evaporators, it performs fault analysis on the m target switching valves. This solves the problem that the solenoid valve controlling the refrigerant to pass through the evaporator in current multi-temperature air conditioning units is easily stuck, leading to system failure. A fault detection method for detecting stuck solenoid valves is proposed, reducing the probability of system failure due to stuck solenoid valves.

[0297] Based on the foregoing embodiments, embodiments of this application provide a fault detection device, referring to... Figure 12 As shown, the fault detection device 6 may include: a control unit 61, a first determining unit 62, an acquisition unit 63, and a second determining unit 64; wherein:

[0298] Control unit 61 is used to control m target switching valves that are in the closed state to the open state if the air conditioning equipment receives an exit command for instructing the air conditioning equipment to exit the reference working mode; wherein, the reference working mode includes a cooling multi-temperature working mode or a heating multi-temperature working mode, the target switching valve is used to control the flow rate of refrigerant flowing through the evaporator in the indoor unit of the air conditioning equipment connected to the target switching valve, and m is an integer greater than or equal to 1.

[0299] The first determining unit 62 is used to determine the target operating mode that the air conditioning equipment needs to switch from from the reference operating mode to.

[0300] The acquisition unit 63 is used to acquire the temperature parameters of n evaporators after the air conditioning equipment switches to the target working mode for a first preset time, and obtain a first temperature set; where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target switching valves;

[0301] The second determining unit 64 is used to determine the fault state of each of the m target switching valves based on the first temperature set.

[0302] In other embodiments of this application, the second determining unit includes: a first determining module and a second determining module; wherein:

[0303] The first determining module is used to determine nm first temperature parameters from the first temperature set, excluding the temperature parameters of the evaporators corresponding to m target switching valves;

[0304] The second determining module is used to determine the fault state of the corresponding target switching valve based on nm first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve; wherein each second temperature parameter belongs to the first temperature set.

[0305] In other embodiments of this application, when the second determining module performs the step of determining the fault state of the corresponding target switching valve based on nm first temperature parameters and the second temperature parameter of the evaporator corresponding to each target switching valve, it can be achieved through the following steps:

[0306] Based on nm first temperature parameters, determine the first temperature analysis parameters;

[0307] Determine the first absolute value of the first target difference between the first temperature analysis parameter and each second temperature parameter;

[0308] Based on each first absolute value, the fault state of the corresponding target switching valve is determined.

[0309] In other embodiments of this application, when the second determining module performs the step of determining the fault state of the corresponding target switching valve based on each first absolute value, it can be achieved through the following steps:

[0310] From m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve;

[0311] The fault status of the reference switching valve is determined to be faulty.

[0312] In other embodiments of this application, when the second determining module performs the step of determining the fault state of the corresponding target switching valve based on each first absolute value, it can be achieved through the following steps:

[0313] From m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve;

[0314] Perform a target operation on the reference switch valve; wherein, the target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch back to the open state;

[0315] After performing the target operation on the reference switching valve for a first preset time, the step of obtaining the temperature parameters of n evaporators and obtaining the first temperature set is executed again.

[0316] If the first absolute value of the reference switching valve is greater than or equal to the first preset threshold, then the steps of performing the target operation on the reference switching valve are repeated.

[0317] If the number of times the reference switch valve performs the target operation is less than or equal to the preset number, and the first absolute value of the reference switch valve is less than the first preset threshold, the fault state of the reference switch valve is determined to be fault-free.

[0318] In other embodiments of this application, when the second determining module performs the step of determining the fault state of the corresponding target switching valve based on each first absolute value, it can be achieved through the following steps:

[0319] From m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve;

[0320] Perform a target operation on the reference switch valve; wherein, the target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch back to the open state;

[0321] After performing the target operation on the reference switch valve for a first preset time, the temperature parameters of n1 evaporators are collected to obtain a second temperature set; wherein, the n1 evaporators include the evaporator corresponding to the reference switch valve, and n1 is greater than the number of reference switch valves;

[0322] Based on the second temperature set, the fault state of the reference switching valve is determined.

[0323] In other embodiments of this application, the second determining module is further configured to perform the following steps:

[0324] If the reference switch valve performs the target operation more than the preset number of times, and the first absolute value of the reference switch valve is greater than or equal to the first preset threshold, the compressor of the air conditioning equipment is controlled to stop working, and the electronic expansion valve of the air conditioning equipment is opened to the preset opening degree.

[0325] After the compressor has stopped working for a second preset period of time, a setting operation is performed on the reference switch valve; wherein, the setting operation is the operation of controlling the reference switch valve to switch to the on state;

[0326] After the compressor of the air conditioning equipment has been running for a third preset time, the fourth temperature parameter of the evaporator corresponding to the reference switch valve and the fifth temperature parameters of x evaporators outside the evaporator corresponding to the reference switch valve are collected; where x is an integer greater than or equal to 1.

[0327] Based on the fourth temperature parameter and x fifth temperature parameters, the fault state of the reference switching valve is determined.

[0328] In other embodiments of this application, the second determining unit includes an acquisition module and a third determining module; wherein:

[0329] The acquisition module is used to acquire the temperature parameters of n evaporators when the exit command is received, and obtain a third temperature set.

[0330] The third determination module is used to determine the fault state of each of the m target switching valves based on the first temperature set and the third temperature set.

[0331] In other embodiments of this application, when the third determining module performs the step of determining the fault state of each of the m target switching valves based on the first temperature set and the third temperature set, it can be achieved through the following steps:

[0332] From the third temperature set, determine nm sixth temperature parameters, excluding the temperature parameters of the evaporators corresponding to the m target switching valves;

[0333] Based on nm sixth temperature parameters and the seventh temperature parameter of the evaporator corresponding to each target switching valve, determine the first reference temperature parameter of the corresponding target switching valve;

[0334] From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporators corresponding to the m target switching valves;

[0335] Based on nm first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, determine the second reference temperature parameter of the corresponding target switching valve;

[0336] Determine the first target difference between each first reference temperature parameter and the second reference temperature parameter;

[0337] Based on each first target difference, the fault state of the corresponding target switching valve is determined.

[0338] In other embodiments of this application, when the third determining module performs the step of determining the first reference temperature parameter of the corresponding target switching valve based on nm sixth temperature parameters and the seventh temperature parameter of the evaporator corresponding to each target switching valve, it can be achieved through the following steps:

[0339] Based on the nm sixth temperature parameters, determine the second temperature analysis parameters;

[0340] The absolute value of the difference between the second temperature analysis parameter and the seventh temperature parameter of the evaporator corresponding to each target switching valve is determined to obtain the first reference temperature parameter of the corresponding target switching valve.

[0341] In other embodiments of this application, when the third determining module performs the step of determining the fault state of each of the m target switching valves based on each first target difference, it can be achieved through the following steps:

[0342] From m target switching valves, determine at least one switching valve whose first target difference is less than or equal to a second preset threshold, and obtain a reference switching valve;

[0343] The fault status of the reference switching valve is determined to be faulty.

[0344] In other embodiments of this application, when the third determining module performs the step of determining the fault state of each of the m target switching valves based on each first target difference, it can be achieved through the following steps:

[0345] From m target switching valves, determine at least one switching valve whose first target difference is less than or equal to a second preset threshold, and obtain a reference switching valve;

[0346] After performing the target operation on the reference switching valve for a first preset time, the step of obtaining the temperature parameters of n evaporators and obtaining the first temperature set is executed again.

[0347] If the first target difference of the reference switching valve is less than or equal to the second preset threshold, then the step of performing the target operation on the reference switching valve is repeated.

[0348] If the number of times the reference switching valve performs the target operation is less than or equal to the preset number, and the first target difference of the reference switching valve is greater than the second preset threshold, the fault state of the reference switching valve is determined to be fault-free.

[0349] In other embodiments of this application, when the third determining module performs the step of determining the fault state of each of the m target switching valves based on each first target difference, it can also be achieved through the following steps:

[0350] From m target switching valves, determine at least one switching valve whose first target difference is less than or equal to a second preset threshold, and obtain a reference switching valve;

[0351] Perform a target operation on the reference switch valve; wherein, the target operation is the operation of controlling the reference switch valve to switch to the closed state and then switch back to the open state;

[0352] After performing the target operation on the reference switch valve for a first preset time, the temperature parameters of n1 evaporators are collected to obtain a second temperature set; wherein, the n1 evaporators include the evaporator corresponding to the reference switch valve, and n1 is greater than the number of reference switch valves;

[0353] Based on the second temperature set, the fault state of the reference switching valve is determined.

[0354] In other embodiments of this application, the third determining module is further configured to perform the following steps:

[0355] If the reference switch valve performs the target operation more than the preset number of times, and the first target difference of the reference switch valve is less than or equal to the first preset threshold, the compressor of the air conditioning equipment is controlled to stop working, and the electronic expansion valve of the air conditioning equipment is opened to the preset opening degree.

[0356] After the compressor has stopped working for a second preset period of time, a setting operation is performed on the reference switch valve; wherein, the setting operation is the operation of controlling the reference switch valve to switch to the on state;

[0357] After the compressor of the air conditioning equipment has been running for a third preset time, the fourth temperature parameter of the evaporator corresponding to the reference switch valve and the fifth temperature parameters of x evaporators outside the evaporator corresponding to the reference switch valve are collected; where x is an integer greater than or equal to 1.

[0358] Based on the fourth temperature parameter and x fifth temperature parameters, the fault state of the reference switching valve is determined.

[0359] In other embodiments of this application, when the third determining module performs the step of determining the fault state of the reference switching valve based on the second temperature set, it can be achieved through the following steps:

[0360] From the second temperature set, determine x1 third temperature parameters, excluding the temperature parameters of the evaporator corresponding to the reference switching valve;

[0361] Based on x1 third temperature parameters, determine the third temperature analysis parameters;

[0362] Determine the second absolute value of the first target difference between the third temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switching valve;

[0363] If the second absolute value is greater than the first preset threshold, the fault state of the reference switching valve is determined to be faulty.

[0364] In other embodiments of this application, the air conditioning device further includes a display unit:

[0365] The second determining unit is also used to determine the identification information of the target switching valve whose fault status is faulty;

[0366] The display unit is used to display fault prompt information; wherein, the fault prompt information is used to indicate the identification information of the target switching valve whose fault status is faulty.

[0367] It should be noted that the specific implementation process of information interaction between units and modules in this embodiment can be referred to Figure 1 and Figures 3-4 The implementation process of the fault detection method provided in the corresponding embodiment will not be described in detail here.

[0368] In this embodiment, if the air conditioning unit receives an exit command instructing it to exit the reference operating mode, it responds to the exit command by controlling m target switching valves that are in the conducting state to switch to the conducting state. After determining the target operating mode from which the air conditioning unit needs to switch from the reference operating mode, it controls the air conditioning unit to switch to the target operating mode for a first preset time, acquires the temperature parameters of n evaporators, obtains a first temperature set, and determines the fault state of each of the m target switching valves based on the first temperature set. Thus, when the air conditioning unit receives an exit command to exit the reference operating mode while operating in the reference operating mode, it switches the m target switching valves that are in the closed state to the conducting state, and after switching the air conditioning unit to the target operating mode for a period of time, it collects the temperature parameters of n evaporators. Based on the temperature parameters of n evaporators, it performs fault analysis on the m target switching valves. This solves the problem that the solenoid valve controlling the refrigerant to pass through the evaporator in current multi-temperature air conditioning units is easily stuck, leading to system failure. A fault detection method for detecting stuck solenoid valves is proposed, reducing the probability of system failure due to stuck solenoid valves.

[0369] Based on the foregoing embodiments, embodiments of this application provide an air conditioning device, referring to... Figure 13 As shown, the air conditioning device 7 may include: an indoor unit 71, an outdoor unit 72, and a fault detection device 73; wherein:

[0370] The specific implementation process of the fault detection device can be referred to Figure 1 and Figures 3-4 The implementation process of the method shown will not be described in detail here. The fault detection device 73 is the same device as the aforementioned fault detection device 6.

[0371] Based on the foregoing embodiments, embodiments of this application provide a computer-readable storage medium, simply referred to as a storage medium, which stores one or more programs that can be executed by one or more processors to achieve, as follows: Figure 1 and Figures 3-4 The implementation process of the fault detection method provided in the corresponding embodiment will not be described in detail here.

[0372] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0373] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0374] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0375] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0376] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application.

Claims

1. A fault detection method, characterized in that, The method includes: If the air conditioning unit receives an exit command indicating that it should exit the reference operating mode, it responds to the exit command by controlling m target switching valves that are in the closed state to switch to the open state; wherein, the reference operating mode includes a cooling multi-temperature operating mode or a heating multi-temperature operating mode, the target switching valve is used to control the flow rate of refrigerant flowing through the evaporator in the indoor unit of the air conditioning unit connected to the target switching valve, m is an integer greater than or equal to 1, the cooling multi-temperature operating mode is that in the cooling mode, the indoor unit of the air conditioning unit can simultaneously output cold air at at least two temperatures, the heating multi-temperature operating mode is that in the heating mode, the indoor unit of the air conditioning unit can simultaneously output hot air at at least two temperatures; Determine the target operating mode from which the air conditioning equipment needs to switch from the reference operating mode; After controlling the air conditioning equipment to switch to the target working mode for a first preset time, the temperature parameters of n evaporators are obtained to obtain a first temperature set; where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target switching valves; Based on the first temperature set, determine the fault state of each of the m target switching valves; The step of determining the fault state of each of the m target switching valves based on the first temperature set includes: From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporator corresponding to the m target switching valves; Based on nm of the first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, the fault state of the corresponding target switching valve is determined; wherein each second temperature parameter belongs to the first temperature set.

2. The method according to claim 1, characterized in that, The step of determining the fault state of the corresponding target switching valve based on the first temperature parameters (nm) and the second temperature parameters of the evaporator corresponding to each target switching valve includes: Based on nm of the first temperature parameters, determine the first temperature analysis parameters; Determine the first absolute value of the first target difference between the first temperature analysis parameter and each of the second temperature parameters; Based on each of the first absolute values, the fault state of the corresponding target switching valve is determined.

3. The method according to claim 2, characterized in that, Determining the fault state of the corresponding target switching valve based on each of the first absolute values ​​includes: From the m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve; The fault status of the reference switching valve is determined to be faulty.

4. The method according to claim 3, characterized in that, Determining the fault state of the corresponding target switching valve based on each of the first absolute values ​​includes: From the m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve; Perform a target operation on the reference switch valve; wherein, the target operation is to control the reference switch valve to switch to the closed state and then switch it to the open state; After the first preset time for performing the target operation on the reference switching valve, the step of obtaining the temperature parameters of n evaporators to obtain the first temperature set is performed again; If the first absolute value of the reference switching valve is greater than or equal to the first preset threshold, then the step of performing the target operation on the reference switching valve is repeated. If the number of times the reference switch valve performs the target operation is less than or equal to a preset number, and the first absolute value of the reference switch valve is less than the first preset threshold, the fault state of the reference switch valve is determined to be fault-free.

5. The method according to claim 2, characterized in that, Determining the fault state of the corresponding target switching valve based on each of the first absolute values ​​includes: From the m target switching valves, at least one switching valve whose first absolute value is greater than or equal to a first preset threshold is determined to obtain a reference switching valve; Perform a target operation on the reference switch valve; wherein, the target operation is to control the reference switch valve to switch to the closed state and then switch it to the open state; After the target operation is performed on the reference switch valve for a first preset time, the temperature parameters of n1 evaporators are collected to obtain a second temperature set; wherein, the n1 evaporators include the evaporator corresponding to the reference switch valve, and n1 is greater than the number of reference switch valves; Based on the second temperature set, the fault state of the reference switching valve is determined.

6. The method according to claim 4 or 5, characterized in that, The method further includes: If the reference switch valve performs the target operation more than a preset number of times, and the first absolute value of the reference switch valve is greater than or equal to the first preset threshold, the compressor of the air conditioning equipment is controlled to stop working, and the electronic expansion valve of the air conditioning equipment is opened to a preset opening degree. After the compressor has paused for a second preset period of time, a setting operation is performed on the reference switch valve; wherein, the setting operation is an operation to control the reference switch valve to switch to the on state; After the compressor of the air conditioning equipment has been running for a third preset period of time, the fourth temperature parameter of the evaporator corresponding to the reference switch valve and the fifth temperature parameters of x evaporators outside the evaporator corresponding to the reference switch valve are collected; where x is an integer greater than or equal to 1. Based on the fourth temperature parameter and x fifth temperature parameters, the fault state of the reference switching valve is determined.

7. The method according to claim 1, characterized in that, The step of determining the fault state of each of the m target switching valves based on the first temperature set includes: Upon receiving the exit command, the temperature parameters of the n evaporators are obtained to obtain a third temperature set; Based on the first temperature set and the third temperature set, determine the fault state of each of the m target switching valves; The step of determining the fault state of each of the m target switching valves based on the first temperature set and the third temperature set includes: From the third temperature set, determine nm sixth temperature parameters, excluding the m temperature parameters of the evaporator corresponding to the target switching valves; Based on the nm sixth temperature parameters and the seventh temperature parameters of the evaporator corresponding to each target switching valve, the first reference temperature parameter of the corresponding target switching valve is determined. From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporator corresponding to the m target switching valves; Based on nm of the first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, the second reference temperature parameter of the corresponding target switching valve is determined; Determine a first target difference between each of the first reference temperature parameter and the second reference temperature parameter; Based on each of the first target differences, the fault state of the corresponding target switching valve is determined.

8. The method according to claim 7, characterized in that determining the first reference temperature parameter of the corresponding target switching valve based on nm of the sixth temperature parameters and the seventh temperature parameter of the evaporator corresponding to each target switching valve includes: Based on the sixth temperature parameter (nm), determine the second temperature analysis parameter; The absolute value of the difference between the second temperature analysis parameter and the seventh temperature parameter of the evaporator corresponding to each target switching valve is determined to obtain the first reference temperature parameter of the corresponding target switching valve.

9. The method according to claim 7, characterized in that, The step of determining the fault state of each of the m target switching valves based on each first target difference includes: From the m target switching valves, at least one switching valve whose first target difference is less than or equal to a second preset threshold is determined to obtain a reference switching valve; The fault status of the reference switching valve is determined to be faulty.

10. The method according to claim 7, characterized in that, The step of determining the fault state of each of the m target switching valves based on each first target difference includes: From the m target switching valves, at least one switching valve whose first target difference is less than or equal to a second preset threshold is determined to obtain a reference switching valve; Perform a target operation on the reference switch valve; wherein, the target operation is to control the reference switch valve to switch to the closed state and then switch it to the open state; After the first preset time for performing the target operation on the reference switching valve, the step of obtaining the temperature parameters of n evaporators to obtain the first temperature set is performed again; If the first target difference of the reference switching valve is less than or equal to the second preset threshold, then the step of performing the target operation on the reference switching valve is repeated. If the number of times the reference switching valve performs the target operation is less than or equal to the preset number, and the first target difference of the reference switching valve is greater than the second preset threshold, the fault state of the reference switching valve is determined to be fault-free.

11. The method according to claim 7, characterized in that, The step of determining the fault state of each of the m target switching valves based on each first target difference includes: From the m target switching valves, at least one switching valve whose first target difference is less than or equal to a second preset threshold is determined to obtain a reference switching valve; Perform a target operation on the reference switch valve; wherein, the target operation is to control the reference switch valve to switch to the closed state and then switch it to the open state; After the target operation is performed on the reference switch valve for a first preset time, the temperature parameters of n1 evaporators are collected to obtain a second temperature set; wherein, the n1 evaporators include the evaporator corresponding to the reference switch valve, and n1 is greater than the number of reference switch valves; Based on the second temperature set, the fault state of the reference switching valve is determined.

12. The method according to claim 10 or 11, characterized in that, The method further includes: If the reference switch valve performs the target operation more than the preset number of times, and the first target difference of the reference switch valve is less than or equal to the first preset threshold, the compressor of the air conditioning equipment is controlled to stop working, and the electronic expansion valve of the air conditioning equipment is opened to the preset opening degree. After the compressor has paused for a second preset period of time, a setting operation is performed on the reference switch valve; wherein, the setting operation is an operation to control the reference switch valve to switch to the on state; After the compressor of the air conditioning equipment has been running for a third preset period of time, the fourth temperature parameter of the evaporator corresponding to the reference switch valve and the fifth temperature parameters of x evaporators outside the evaporator corresponding to the reference switch valve are collected; where x is an integer greater than or equal to 1. Based on the fourth temperature parameter and x fifth temperature parameters, the fault state of the reference switching valve is determined.

13. The method according to claim 5 or 11, characterized in that, Determining the fault state of the reference switching valve based on the second temperature set includes: From the second temperature set, determine x1 third temperature parameters, excluding the temperature parameters of the evaporator corresponding to the reference switching valve; Based on x1 of the aforementioned third temperature parameters, the third temperature analysis parameters are determined; Determine the second absolute value of the first target difference between the third temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switching valve; If the second absolute value is greater than the first preset threshold, the fault state of the reference switching valve is determined to be faulty.

14. The method according to any one of claims 1 to 5, 7 to 11, characterized in that, After determining the fault state of each of the m target switching valves based on the first temperature set, the method further includes: Identification information of the target switching valve whose fault status is determined to be faulty; Display fault indication information; wherein, the fault indication information is used to indicate the identification information of the target switching valve whose fault status is faulty.

15. A fault detection device, characterized in that, The device includes: a control unit, a first determining unit, an acquisition unit, and a second determining unit; wherein: The control unit is configured to, in response to an exit command indicating that the air conditioning equipment should exit the reference operating mode, control m target switching valves that are currently closed to switch to the open state. The reference operating mode includes either a multi-temperature cooling operating mode or a multi-temperature heating operating mode. The target switching valves control the flow rate of refrigerant through the evaporator in the indoor unit of the air conditioning equipment connected to the target switching valve. m is an integer greater than or equal to 1. The multi-temperature cooling operating mode is a cooling mode in which the indoor unit of the air conditioning equipment can simultaneously output cold air at at least two temperatures. The multi-temperature heating operating mode is a heating mode in which the indoor unit of the air conditioning equipment can simultaneously output hot air at at least two temperatures. The first determining unit is used to determine the target operating mode that the air conditioning equipment needs to switch from the reference operating mode to; The acquisition unit is used to control the air conditioning equipment to switch to the target working mode for a first preset time, and then acquire the temperature parameters of n evaporators to obtain a first temperature set; where n is an integer greater than m, and the n evaporators include the evaporators corresponding to m target switching valves; The second determining unit is used to determine the fault state of each of the m target switching valves based on the first temperature set; The second determining unit is specifically used to implement the following steps: From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporator corresponding to the m target switching valves; Based on nm of the first temperature parameters and the second temperature parameters of the evaporator corresponding to each target switching valve, the fault state of the corresponding target switching valve is determined; wherein each second temperature parameter belongs to the first temperature set.

16. An air conditioning device, characterized in that, The equipment includes: an indoor unit, an outdoor unit, and a fault detection device as described in claim 15.

17. A storage medium, characterized in that, The storage medium stores a fault detection program, which, when executed by a processor, implements the steps of the fault detection method as described in any one of claims 1 to 14.

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