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

Abstract

This application discloses a fault detection method, comprising: if an air conditioning device receives a switching command instructing the air conditioning device to switch to a target operating mode, responding to the switching command, controlling m target switching valves in the conducting state to switch to the closed state; wherein, the target 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 device connected to the target switching valve, and m is an integer greater than or equal to 1; after controlling the m target switching valves to switch to the closed state for a first preset time, collecting n temperature parameters of the evaporator to obtain a first temperature set; wherein, n is an integer greater than m; based on the first temperature set, determining the fault state of each of the m target switching valves. This application also discloses 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 energized and closed, both its inlet and outlet are closed. This can cause the pressure at the inlet to press against the valve core. If the pressure at the inlet is too high, the spring of the normally open solenoid valve may not retract after de-energization, preventing the inlet and outlet from connecting 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 in current multi-temperature air conditioning equipment, it is difficult to detect when the solenoid valve controlling the refrigerant's passage through the evaporator is stuck, leading to system malfunctions. The application proposes a fault detection method for detecting stuck solenoid valves, reducing the probability of system malfunctions caused by stuck solenoid valves.

[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 a switching command to instruct the air conditioning equipment to switch to a target operating mode, in response to the switching command, it controls m target switching valves that are in the conducting state to switch to the closed state; wherein, the target 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] After controlling m target switching valves to switch to the closed state for a first preset time, the temperature parameters of n evaporators are collected 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;

[0010] Based on the first temperature set, the fault state of each of the m target switching valves is determined.

[0011] Secondly, a fault detection device, the device comprising: a control unit, a data acquisition unit, and a determination unit; wherein:

[0012] The control unit is configured to, in response to a switching command instructing the air conditioning equipment to switch m target switching valves in the on state to the off state if the air conditioning equipment receives a switching command instructing the air conditioning equipment to switch to a target operating mode; wherein, the target 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, the switching command is used to instruct the air conditioning equipment to exit the target operating mode, and m is an integer greater than or equal to 1;

[0013] The acquisition unit is used to acquire temperature parameters of n evaporators after controlling m target switching valves to switch to the closed state for a first preset time, 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;

[0014] The determining unit is used to determine the fault state of each of the m target switching valves based on the first temperature set.

[0015] Thirdly, an air conditioning device, the device comprising: an indoor unit, an outdoor unit, and a fault detection device as described above.

[0016] 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.

[0017] In this embodiment, if the air conditioning unit receives a switching command instructing it to switch to a target operating mode, it responds to the switching command by controlling m target switching valves that are in the on state to switch to the off state. After a first preset time period following the control of the m target switching valves to the off state, it collects the temperature parameters of n evaporators to obtain a first temperature set. Finally, based on the first temperature set, it determines the fault state of each of the m target switching valves. Thus, when the air conditioning unit receives a switching command while operating in the target operating mode, it switches the m target switching valves that are in the on state to the off state for a period of time, collects the temperature parameters of n evaporators, and performs fault analysis on the m target switching valves based on the temperature parameters of the n evaporators. This solves the problem in current multi-temperature air conditioning units where it is difficult to detect when the solenoid valve controlling the refrigerant to pass through the evaporator is stuck, 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

[0018] Figure 1 Flowchart of the fault detection method provided in the embodiments of this application Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the circuit structure connection of an air conditioning device provided in an embodiment of this application;

[0020] Figure 3 Flowchart of the fault detection method provided in the embodiments of this application Figure 2 ;

[0021] Figure 4 Flowchart of the fault detection method provided in the embodiments of this application Figure 3 ;

[0022] Figure 5 A flowchart illustrating an application embodiment of a fault detection method provided in this application;

[0023] Figure 6 This is a schematic diagram illustrating the application of an air conditioning device according to an embodiment of this application;

[0024] Figure 7 This is a schematic diagram illustrating an application scenario provided in an embodiment of this application.

[0025] Figure 8 Flowchart of another application embodiment of the fault detection method provided in this application;

[0026] Figure 9 This is a schematic diagram illustrating the application of another air conditioning device provided in an embodiment of this application;

[0027] Figure 10This is a schematic diagram illustrating another application scenario provided by an embodiment of this application;

[0028] Figure 11 This is a schematic diagram of the structure of a fault detection device provided in an embodiment of this application;

[0029] Figure 12 This is a schematic diagram of the structure of an air conditioning device provided in an embodiment of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0031] 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:

[0032] Step 101: If the air conditioning equipment receives a switching command to instruct the air conditioning equipment to switch to the target working mode, respond to the switching command and control m target switching valves that are in the conducting state to switch to the closed state.

[0033] The target 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. The switching command is used to instruct the air conditioning equipment to exit the target operating mode. m is an integer greater than or equal to 1.

[0034] 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.

[0035] The switching commands received by the air conditioning unit can be obtained by pressing physical or virtual buttons 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 either multi-temperature cooling or multi-temperature heating mode, the lowest temperature air is typically positioned at the top of the space. This prevents hot air from rising, ensuring a cool head and warm body for the user, thus improving the user experience.

[0036] When the air conditioning unit is currently operating in either the cooling multi-temperature mode or the heating multi-temperature mode, if it receives a switching command from the user instructing it to switch to the target mode, it controls m target switching valves that are currently in the on state to switch to the off state. This allows the air conditioning unit to switch to the target mode and output multiple cold or hot airflows. The target switching valve is a valve that controls the 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 on / off state can be controlled by whether or not a power supply is provided to it. 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 the 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.

[0037] Step 102: After controlling m target switching valves to switch to the closed state for a first preset time, collect the temperature parameters of n evaporators to obtain the first temperature set.

[0038] Where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target on / off valves.

[0039] 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 closed state for the first preset duration, 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.

[0040] Step 103: Based on the first temperature set, determine the fault state of each of the m target switching valves.

[0041] In this embodiment, a first temperature set is analyzed to determine the fault state of each of the m target switching valves. The fault state of the target switching valve includes two states: faulty and faultless. A faulty state refers to the target switching valve being stuck.

[0042] In this embodiment, if the air conditioning unit receives a switching command instructing it to switch to a target operating mode, it responds to the switching command by controlling m target switching valves that are in the on state to switch to the off state. After a first preset time period following the control of the m target switching valves to the off state, it collects the temperature parameters of n evaporators to obtain a first temperature set. Finally, based on the first temperature set, it determines the fault state of each of the m target switching valves. Thus, when the air conditioning unit receives a switching command while operating in the target operating mode, it switches the m target switching valves that are in the on state to the off state for a period of time, collects the temperature parameters of n evaporators, and performs fault analysis on the m target switching valves based on the temperature parameters of the n evaporators. This solves the problem in current multi-temperature air conditioning units where it is difficult to detect when the solenoid valve controlling the refrigerant to pass through the evaporator is stuck, 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.

[0043] 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:

[0044] Step 201: If the air conditioning equipment receives a switching command to instruct the air conditioning equipment to switch to the target working mode, respond to the switching command and control m target switching valves that are in the conducting state to switch to the closed state.

[0045] The target 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. The switching command is used to instruct the air conditioning equipment to exit the target operating mode. m is an integer greater than or equal to 1.

[0046] In this embodiment of the application, the user sends a switching command to the air conditioner via the air conditioner remote control device to instruct the air conditioner to switch to a target working mode, such as a multi-temperature cooling working mode. After receiving the switching command, the air conditioner responds to the switching command and controls m target switching valves that are in the conducting state to switch to the closed state, so that all refrigerant does not pass through the target switching valves or only some refrigerant passes through the target switching valves.

[0047] 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 a switching command instructing the air conditioning unit to switch to the target 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 is in the closed state. 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.

[0048] Step 202: After controlling m target switching valves to switch to the closed state for a first preset time, collect the temperature parameters of n evaporators to obtain the first temperature set.

[0049] Where n is an integer greater than m, and the n evaporators include the evaporators corresponding to the m target on / off valves.

[0050] In the embodiments of this application, control Figure 2 After the switch valve in the middle is switched to the closed state for a first preset time, such as 3 minutes, the temperature parameter 1 of the evaporator 1 is collected by temperature sensor 1, and the temperature parameter 2 of the evaporator 2 is collected by temperature sensor 2, so as to obtain a first temperature set including temperature parameter 1 and temperature parameter 2.

[0051] Step 203: Based on the first temperature set, determine the fault state of each of the m target switching valves.

[0052] In this embodiment of the application, the first temperature set is analyzed to determine... Figure 2 The fault status of the switching valve in the system.

[0053] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 3As shown, step 203 can be implemented by steps 203a to 203b:

[0054] Step 203a: From the first temperature set, determine nm first temperature parameters, excluding the temperature parameters of the evaporators corresponding to m target switching valves.

[0055] In this embodiment of the application, from the first temperature set, the temperature parameters of evaporators that are not connected to the switch valve in the closed state and / or evaporators that are not connected to the switch valve are determined, and nm first temperature parameters are obtained, excluding the temperature parameters of the evaporators corresponding to the m target switch valves.

[0056] For example, from the first temperature set, the temperature parameters other than the temperature parameters corresponding to evaporator 1 are determined to obtain one first temperature parameter corresponding to evaporator 2.

[0057] Step 203b: 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.

[0058] Each of the second temperature parameters belongs to the first temperature set.

[0059] In this embodiment of the application, the first temperature parameters of nm and the second temperature parameters of the evaporator corresponding to each target switching valve are analyzed to determine the fault state of each target switching valve.

[0060] For example, the first temperature parameter of evaporator 1 and the second temperature parameter of evaporator 2 are analyzed to determine the fault status of the switching valve connected to evaporator 1.

[0061] Based on the foregoing embodiments, in other embodiments of this application, step 203b can be implemented by steps a11 to a13:

[0062] Step a11: Determine the first temperature analysis parameters based on nm first temperature parameters.

[0063] 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.

[0064] For example, the first temperature parameter corresponding to evaporator 2 is used as the first temperature analysis parameter.

[0065] Step a12: Determine the first absolute value of the difference between the first temperature analysis parameter and each second temperature parameter.

[0066] In the embodiments of this application, the first absolute value = |first temperature analysis parameter - each second temperature parameter|, where || is the sign of taking the first absolute value.

[0067] 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|.

[0068] Step a13: Based on each first absolute value, determine the fault state of the corresponding target switching valve.

[0069] 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.

[0070] 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.

[0071] Based on the foregoing embodiments, in other embodiments of this application, a method is provided for determining the fault state of the corresponding target switching valve based on each first absolute value, that is, step a13 can be implemented by steps a1301 to a1302:

[0072] Step a1301: Determine at least one switching valve from the m target switching valves whose first absolute value is less than or equal to a preset threshold, and obtain a reference switching valve.

[0073] In this embodiment, the 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 preset threshold to determine the fault state of each target switching valve.

[0074] It should be noted that in some application scenarios, there may be a situation where the first absolute value of all target switching valves is less than the preset threshold, that is, there is no reference switching valve, indicating that no target switching valve has failed.

[0075] Step a1302: Determine that the fault status of the reference switch valve is faulty.

[0076] If the first absolute value of a target switching valve is less than or equal to a preset threshold, the fault state of that target switching valve is determined to be faulty; if the first absolute value of a target switching valve is greater than the preset threshold, the fault state of that target switching valve is determined to be fault-free.

[0077] Based on the foregoing embodiments, in other embodiments of this application, another implementation method is provided for determining the fault state of the corresponding target switching valve based on each first absolute value, that is, step a13 can also be implemented by steps a1303 to a1307:

[0078] Step a1303: Determine at least one switching valve from the m target switching valves whose first absolute value is less than or equal to a preset threshold, and obtain a reference switching valve.

[0079] Step 1304: Perform the target operation on the reference switch valve.

[0080] The target operation is the operation of controlling the reference switch valve to switch to the on state and then switch to the off state.

[0081] In this embodiment, the target operation is to control the reference switch valve to switch to the on state and then switch to the off 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.

[0082] Step 1305: After performing the target operation on the reference switch valve for the first preset time, perform the step of collecting the temperature parameters of n evaporators again to obtain the first temperature set.

[0083] Step 1306: If the first absolute value of the reference switch valve is less than or equal to the preset threshold, then repeat the step of performing the target operation on the reference switch valve.

[0084] Step 1307: If the number of times the target operation is performed on the reference switch valve is less than or equal to the preset number, and the first absolute value of the reference switch valve is greater than the preset threshold, the fault state of the reference switch valve is determined to be fault-free.

[0085] In this embodiment, the preset number of times is an empirical value obtained from a large number of experiments, or an empirical value set according to actual conditions. The number of times the target operation is performed on the reference switch valve is counted as one execution count for each time the target operation is performed on the reference switch valve. That is, the count is incremented by 1 each time the target operation is performed on the reference switch valve.

[0086] Thus, after executing step a1304, steps 202, 203a, a11-a12, and a1303-a1304 are repeated sequentially until the number of times the target operation is performed on the reference switch valve is less than or equal to the preset number, and the first absolute value of the reference switch valve is greater than the preset threshold. At this point, the fault state of the reference switch valve is determined to be fault-free. This proactively resolves the reference switch valve's fault by controlling the target operation of quickly opening and immediately closing the valve, reducing the possibility of the reference switch valve getting 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 remains in the closed state.

[0087] Based on the foregoing embodiments, in other embodiments of this application, another implementation method is provided for determining the fault state of the corresponding target switching valve based on each first absolute value, that is, step a13 can also be implemented by steps a1308 to a13011:

[0088] Step a1308: Determine at least one switching valve from the m target switching valves whose first absolute value is less than or equal to a preset threshold, and obtain a reference switching valve.

[0089] Step 1309: Perform the target operation on the reference switch valve.

[0090] The target operation is the operation of controlling the reference switch valve to switch to the on state and then switch to the off state.

[0091] Step 13010: 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.

[0092] Among them, n1 evaporators include the evaporators corresponding to the reference switching valves, and n1 is greater than the number of reference switching valves.

[0093] Step 13011: Determine the fault state of the reference switching valve based on the second temperature set.

[0094] In this embodiment of the application, the second temperature set is analyzed to determine the fault state of the reference switching valve.

[0095] Based on the foregoing embodiments, in other embodiments of this application, the air conditioning device is further used to perform steps 13012 to 13015:

[0096] Step 13012: 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 less than or equal to the 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.

[0097] In this embodiment, the preset opening degree is the maximum opening degree of the electronic expansion valve, which is a throttling device. 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 throttling device of the air conditioning equipment is controlled to be at its maximum opening degree. After the pressure of the air conditioning system is balanced, the reference switch valve is controlled to be in the closed state, that is, the opening degree of the reference switch valve is controlled to be 0, which ensures that the pressure on both sides of the reference switch valve is quickly balanced.

[0098] Step 13013: After the compressor has stopped working for a second preset time, perform a setting operation on the reference switching valve.

[0099] The setting operation is the operation of controlling the reference switch valve to switch to the on state.

[0100] In this embodiment, the second preset duration can be obtained based on numerous experiments, ensuring pressure balance across the switching valve. The compressor of the air conditioning unit is paused for the second preset duration to allow the pressure across the reference switching valve to balance, and then the set operation is performed on the reference switching valve.

[0101] Step 13014: 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.

[0102] Where x is an integer greater than or equal to 1.

[0103] 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.

[0104] Step 13015: Determine the fault status of the reference switching valve based on the fourth temperature parameter and x fifth temperature parameters.

[0105] In the embodiments of this application, the implementation process of step a13015 can refer to the implementation process of steps b12 to b14 below, which will not be described in detail here.

[0106] Based on the foregoing embodiments, in other embodiments of this application, step a13011 can be implemented by steps b11 to b14:

[0107] Step b11: From the second temperature set, determine x1 third temperature parameters, excluding the temperature parameters of the evaporator corresponding to the reference switching valve.

[0108] Step b12: Determine the second temperature analysis parameters based on x1 third temperature parameters.

[0109] In the embodiments of this application, the implementation process of step b12 can refer to the implementation process of step a11, and will not be described in detail here.

[0110] Step b13: Determine the second absolute value of the difference between the second temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switch valve.

[0111] Step b14: If the second absolute value is less than or equal to the preset threshold, determine that the fault state of the reference switch valve is faulty.

[0112] In this embodiment of the application, if the second absolute value is greater than a preset threshold, the fault state of the reference switching valve is determined to be fault-free.

[0113] Based on the foregoing embodiments, in other embodiments of this application, reference is made to... Figure 4 As shown, after the air conditioning equipment performs step 203, it is also used to perform steps 204 to 205:

[0114] Step 204: Determine the identification information of the target switching valve whose fault status is faulty.

[0115] 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.

[0116] Step 205: Display fault message.

[0117] Among them, the fault indication information is used to indicate the identification information of the target switching valve whose fault status is faulty.

[0118] 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.

[0119] Based on the foregoing embodiments, this application provides a Figure 2 The implementation process of the fault detection method for the air conditioning equipment when it switches to the dual-temperature cooling mode, as shown, can be referred to... Figure 5 As shown, the air conditioning equipment's execution process specifically includes the following steps:

[0120] Step 301: If the first instruction to switch to the dual-temperature working mode of cooling is detected, determine whether the current working mode of the air conditioner is cooling mode. If it is not cooling mode, proceed to steps 302-303. If it is cooling mode, proceed to step 304.

[0121] Step 302: Connect the power supply to the normally open solenoid valve.

[0122] The power supply connected to the normally open solenoid valve can power the valve and control its closure. When the air conditioning unit is in fan-operated mode, the compressor is in shutdown mode.

[0123] Step 303: Switch the air conditioning unit to cooling mode.

[0124] When switching the air conditioning equipment to cooling mode, if the current operating mode of the air conditioning equipment is heating mode, the air conditioning equipment first controls the compressor to pause for a certain period of time to achieve the switching of the refrigerant transmission link, and then controls the compressor to switch from heating operation mode to cooling operation mode.

[0125] Thus, after executing steps 302 and 303, the air conditioning unit enters a dual-temperature cooling mode. The corresponding refrigerant flow diagram within the air conditioning unit can be found by referring to... 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.

[0126] At this time, if the current working mode is not cooling mode, it can be either fan mode or heating mode.

[0127] Step 304: Connect the power supply to the normally open solenoid valve.

[0128] Step 305: After the power supply to the normally open solenoid valve is connected for a period of time t1, the temperature T11 of evaporator 1 and the temperature T21 of evaporator 2 are collected.

[0129] The value of t1 can be 3 minutes.

[0130] Step 306: Determine if |T11-T21| is greater than T. If it is greater than T, proceed to step 307. If it is less than or equal to T, proceed to step 308.

[0131] The value of T can be 5 degrees Celsius.

[0132] Step 307: Maintain power supply to the normally open solenoid valve.

[0133] Step 308: Perform the target operation.

[0134] The target operation is to quickly disconnect the power supply to the normally open solenoid valve and then reconnect the power supply to the normally open solenoid valve.

[0135] Step 309: Count the number of times the target operation is executed, and determine whether the number is greater than the preset number. If it is less than or equal to the preset number, proceed to step 305. If it is greater than the preset number, proceed to step 310.

[0136] Each time step 309 is executed, the number of times the target operation is executed is incremented by 1, and the initial value of the number of times the target operation is executed is 0. The preset number of times can be, for example, 5 times.

[0137] Step 310: Control the compressor to stop for the second preset time, control the throttling device to open to the maximum degree, and connect the power supply to the normally open solenoid valve.

[0138] The throttling device can be an electronic expansion valve. Correspondingly, controlling the throttling device to open to its maximum degree is equivalent to controlling the electronic expansion valve to open to its maximum degree, which can balance the system pressure of the air conditioning system.

[0139] Step 311: After the third preset time of power supply to the normally open solenoid valve, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2.

[0140] Step 312: Determine if |T12-T22| is greater than T. If it is greater than T, proceed to step 307. If it is less than or equal to T, proceed to step 313.

[0141] Step 313: Issue a fault alarm.

[0142] Among them, while performing fault alarms, the air conditioning equipment can be switched to cooling mode, or it can be switched back to the working mode before entering the dual-temperature cooling mode.

[0143] It should be noted that in some application scenarios, when the air conditioner is switching to the dual-temperature cooling mode, if the current working mode of the air conditioner is the air supply mode or the heating mode, it can directly switch from the air supply mode or the heating mode to the cooling mode before connecting the power supply to the normally open solenoid valve, and finally execute the operations corresponding to steps 305 to 313.

[0144] Correspondingly, this application also provides an implementation flow of the fault detection method when the above-mentioned air conditioning equipment switches to the heating dual-temperature working mode, which can be referred to. Figure 8 As shown, the air conditioning equipment's execution process specifically includes the following steps:

[0145] Step 401: If the first instruction to switch to the dual-temperature heating mode is detected, determine whether the current working mode of the air conditioning equipment is heating mode. If it is not heating mode, proceed to step 402. If it is heating mode, proceed to step 403.

[0146] Step 402: Switch the air conditioning unit to heating mode.

[0147] If the current operating mode is air supply mode, cooling mode, or dehumidification mode, you can first switch the air conditioning equipment to heating mode.

[0148] Step 403: Connect the power supply to the normally open solenoid valve.

[0149] Thus, when the air conditioner is in heating mode, connecting the power supply to the normally open solenoid valve can control the refrigerant to bypass evaporator 1, ensuring that the airflow temperature output from evaporator 1 is lower than that output from evaporator 2, achieving a multi-temperature heating mode. This allows the air conditioner to enter a dual-temperature heating mode. A diagram showing the corresponding refrigerant flow direction for the air conditioner can be found here. 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.

[0150] Step 404: After the power supply to the normally open solenoid valve is connected for a period of time t1, the temperature T11 of evaporator 1 and the temperature T21 of evaporator 2 are collected.

[0151] The value of t1 can be 3 minutes.

[0152] Step 405: Determine if |T11-T21| is greater than T. If it is greater than T, proceed to step 406. If it is less than or equal to T, proceed to step 407.

[0153] The value of T can be 5 degrees Celsius.

[0154] Step 406: Maintain power supply to the normally open solenoid valve.

[0155] Step 407: Perform the target operation.

[0156] The target operation is to quickly disconnect the power supply to the normally open solenoid valve and then reconnect the power supply to the normally open solenoid valve.

[0157] Step 408: Count the number of times the target operation is executed and determine whether the number is greater than the preset number. If it is less than or equal to the preset number, proceed to step 403. If it is greater than the preset number, proceed to step 409.

[0158] Each time step 408 is executed, the number of times the target operation is executed is incremented by 1, and the initial value of the number of times the target operation is executed is 0.

[0159] Step 409: Control the compressor to stop for the second preset time, control the throttling device to open to the maximum degree, and connect the power supply to the normally open solenoid valve.

[0160] Step 410: After the third preset time of power supply to the normally open solenoid valve, collect the temperature T12 of evaporator 1 and the temperature T22 of evaporator 2.

[0161] Step 411: Determine if |T12-T22| is greater than T. If it is greater than T, proceed to step 406. If it is less than or equal to T, proceed to step 412.

[0162] Step 412: Issue a fault alarm.

[0163] While triggering a fault alarm, the system can switch the air conditioning unit to heating mode or switch it back to its current operating mode before entering the dual-temperature heating mode.

[0164] It should be noted that in some application scenarios, when the air conditioner is switching to the dual-temperature heating mode, if the current working mode of the air conditioner is the air supply mode or the heating mode, the power supply to the normally open solenoid valve can be connected first before switching from the air supply mode or the heating mode to the cooling mode. Correspondingly, when the current working mode of the air conditioner is the cooling mode or the dehumidification mode, the power supply to the normally open solenoid valve should also be connected first before performing the operations corresponding to steps 404 to 412.

[0165] In this way, during the switching from cooling mode or dehumidification mode, heating mode or air supply mode to multi-temperature cooling mode or multi-temperature heating mode, the system's self-checking and self-repairing control function solves the problem of occasional jamming or freezing of normally open solenoid valves, reduces system failures, and improves the user experience.

[0166] 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.

[0167] In this embodiment, if the air conditioning unit receives a switching command instructing it to switch to a target operating mode, it responds to the switching command by controlling m target switching valves that are in the on state to switch to the off state. After a first preset time period following the control of the m target switching valves to the off state, it collects the temperature parameters of n evaporators to obtain a first temperature set. Finally, based on the first temperature set, it determines the fault state of each of the m target switching valves. Thus, when the air conditioning unit receives a switching command while operating in the target operating mode, it switches the m target switching valves that are in the on state to the off state for a period of time, collects the temperature parameters of n evaporators, and performs fault analysis on the m target switching valves based on the temperature parameters of the n evaporators. This solves the problem in current multi-temperature air conditioning units where it is difficult to detect when the solenoid valve controlling the refrigerant to pass through the evaporator is stuck, 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.

[0168] Based on the foregoing embodiments, embodiments of this application provide a fault detection device, referring to... Figure 11 As shown, the fault detection device 5 may include: a control unit 51, a data acquisition unit 52, and a determination unit 53; wherein:

[0169] Control unit 51 is configured to, in response to a switching instruction received by the air conditioning equipment to instruct the air conditioning equipment to switch to a target operating mode, control m target switching valves that are in the conducting state to switch to the closed state; wherein, the target 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, the switching instruction is used to instruct the air conditioning equipment to exit the target operating mode, and m is an integer greater than or equal to 1;

[0170] The acquisition unit 52 is used to acquire the temperature parameters of n evaporators after controlling m target switching valves to switch to the closed state 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;

[0171] The determination unit 53 is used to determine the fault state of each of the m target switching valves based on the first temperature set.

[0172] In other embodiments of this application, the determining unit includes: a first determining module and a second determining module; wherein:

[0173] 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;

[0174] 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.

[0175] In other embodiments of this application, the second determining module is specifically used to implement the following steps:

[0176] Based on nm first temperature parameters, determine the first temperature analysis parameters;

[0177] Determine the first absolute value of the difference between the first temperature analysis parameter and each second temperature parameter;

[0178] Based on each first absolute value, the fault state of the corresponding target switching valve is determined.

[0179] In other embodiments of this application, when the second determining module is used to determine the fault state of the corresponding target switching valve based on each first absolute value, it can be implemented through the following steps:

[0180] From m target switching valves, at least one switching valve whose first absolute value is less than or equal to a preset threshold is determined to obtain a reference switching valve;

[0181] The fault status of the reference switching valve is determined to be faulty.

[0182] In other embodiments of this application, when the second determining module is used to determine the fault state of the corresponding target switching valve based on each first absolute value, it can also be implemented through the following steps:

[0183] From m target switching valves, at least one switching valve whose first absolute value is less than or equal to a preset threshold is determined to obtain a reference switching valve;

[0184] 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 on state and then switch to the off state.

[0185] After performing the target operation on the reference switch valve for a first preset time, the step of collecting the temperature parameters of n evaporators is performed again to obtain the first temperature set.

[0186] If the first absolute value of the reference switching valve is less than or equal to the preset threshold, the steps of performing the target operation on the reference switching valve are repeated.

[0187] If the number of times the target operation is performed on the reference switch valve is less than or equal to the preset number, and the first absolute value of the reference switch valve is greater than the preset threshold, the fault state of the reference switch valve is determined to be fault-free.

[0188] In other embodiments of this application, when the second determining module is used to determine the fault state of the corresponding target switching valve based on each first absolute value, it can be implemented through the following steps:

[0189] From m target switching valves, at least one switching valve whose first absolute value is less than or equal to a preset threshold is determined to obtain a reference switching valve;

[0190] 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 on state and then switch to the off state.

[0191] 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;

[0192] Based on the second temperature set, the fault state of the reference switching valve is determined.

[0193] In other embodiments of this application, the second determining module is further configured to implement the following steps:

[0194] 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 less than or equal to the 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.

[0195] 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;

[0196] 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.

[0197] Based on the fourth temperature parameter and x fifth temperature parameters, the fault state of the reference switching valve is determined.

[0198] In other embodiments of this application, when the second determining module determines the fault state of the reference switching valve based on the second temperature set, it can be achieved through the following steps:

[0199] From the second temperature set, determine x1 third temperature parameters, excluding the temperature parameters of the evaporator corresponding to the reference switching valve;

[0200] Based on x1 third temperature parameters, determine the second temperature analysis parameters;

[0201] Determine the second absolute value of the difference between the second temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switching valve;

[0202] If the second absolute value is less than or equal to the preset threshold, the fault state of the reference switching valve is determined to be faulty.

[0203] In other embodiments of this application, after determining the unit, the air conditioning device may further include: a display unit; wherein:

[0204] The determination unit is also used to determine the identification information of the target switching valve whose fault status is faulty;

[0205] 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.

[0206] 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.

[0207] In this embodiment, if the air conditioning unit receives a switching command instructing it to switch to a target operating mode, it responds to the switching command by controlling m target switching valves that are in the on state to switch to the off state. After a first preset time period following the control of the m target switching valves to the off state, it collects the temperature parameters of n evaporators to obtain a first temperature set. Finally, based on the first temperature set, it determines the fault state of each of the m target switching valves. Thus, when the air conditioning unit receives a switching command while operating in the target operating mode, it switches the m target switching valves that are in the on state to the off state for a period of time, collects the temperature parameters of n evaporators, and performs fault analysis on the m target switching valves based on the temperature parameters of the n evaporators. This solves the problem in current multi-temperature air conditioning units where it is difficult to detect when the solenoid valve controlling the refrigerant to pass through the evaporator is stuck, 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.

[0208] Based on the foregoing embodiments, embodiments of this application provide an air conditioning device, referring to... Figure 12 As shown, the air conditioning unit 6 may include: an indoor unit 61, an outdoor unit 62, and a fault detection device 63; wherein:

[0209] 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 63 is the same device as the aforementioned fault detection device 5.

[0210] 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.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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 by, The method includes: If the air conditioning unit receives a switching command instructing it to switch to a target operating mode, it responds to the switching command by controlling m target switching valves that are in the on state to switch to the off state; wherein, the target 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 in the cooling mode in which 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 in the heating mode in which the indoor unit of the air conditioning unit can simultaneously output hot air at at least two temperatures; After controlling m target switching valves to switch to the closed state for a first preset time, the temperature parameters of n evaporators are collected 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 from 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 of claim 1, wherein, 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 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 of claim 2, wherein, 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 less than or equal to a 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 of claim 2, wherein, 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 less than or equal to a 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 on state and then switch to the off state. After the first preset time for performing the target operation on the reference switching valve, the step of collecting 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 less than or equal to the preset threshold, then the step of performing the target operation on the reference switching valve is repeated. If the number of times the target operation is performed on the reference switch valve is less than or equal to a preset number, and the first absolute value of the reference switch valve is greater than the preset threshold, the fault state of the reference switch valve is determined to be fault-free.

5. The method of claim 2, wherein, 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 less than or equal to a 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 on state and then switch to the off 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 the preset number of times, and the first absolute value of the reference switch valve is less than or equal to the preset threshold, the compressor of the air conditioning equipment is controlled to stop working, and the opening degree of 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.

7. The method of claim 5, wherein, 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 third temperature parameters, determine the second temperature analysis parameters; Determine the second absolute value of the difference between the second temperature analysis parameter and the temperature parameter of the evaporator corresponding to the reference switching valve; If the second absolute value is less than or equal to the preset threshold, the fault state of the reference switching valve is determined to be faulty.

8. The method according to any one of claims 1 to 3, 7, 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.

9. A fault detection apparatus characterized by comprising: The device includes: a control unit, a data acquisition unit, and a determination unit; wherein: The control unit is configured to, upon receiving a switching command instructing the air conditioning equipment to switch to a target operating mode, respond to the switching command and control m target switching valves in the conducting state to switch to the closed state; wherein, the target 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, the switching command is configured to instruct the air conditioning equipment to exit the target operating mode, m is an integer greater than or equal to 1, the cooling multi-temperature operating mode is in cooling mode in which the indoor unit of the air conditioning equipment can simultaneously output cold air at at least two temperatures, and the heating multi-temperature operating mode is in heating mode in which the indoor unit of the air conditioning equipment can simultaneously output hot air at at least two temperatures; The acquisition unit is used to acquire temperature parameters of n evaporators after controlling m target switching valves to switch to the closed state for a first preset time, 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; The determining unit is used to determine the fault state of each of the m target switching valves based on the first temperature set. Specifically, the determining unit is 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.

10. An air conditioning apparatus characterized by comprising: The device includes: an indoor unit, an outdoor unit, and a fault detection device as described in claim 9.

11. 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 8.

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