Electric heater control circuit, air conditioner and control method

Abstract

The invention provides an electric heater control circuit, an air conditioner and a control method. The electric heater control circuit comprises a control module and a temperature limiting module. The control module is used for being connected with a heating loop of the air conditioner; the temperature limiting module is connected with the control module and is used for detecting the temperature of the electric heater in the heating loop; and the control module controls the on-off of the heating loop according to the on-off of the temperature limiting module. According to the method, the cost can be reduced, and the fault type of the air conditioner when the temperature is too high can be confirmed.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an electric heater control circuit, an air conditioner and a control method. Background Art

[0002] Due to its high power, high-power air conditioners are prone to high temperatures inside the air conditioner when the fan stops running or the air outlet is blocked, causing deformation or even fire of plastic parts inside the air conditioner. To address the above problems, the current common practice is to set up a protection circuit for the heating circuit. Traditional protection circuits generally use multiple high-current and high-voltage temperature limiters, and connect the temperature limiters in series with the heating circuit. However, the cost of high-current and high-voltage temperature limiters is relatively high. At the same time, the use of high-current and high-voltage temperature limiters requires the use of large-diameter and high-voltage high-temperature wires, which further increases the cost. Summary of the invention

[0003] The present invention provides an electric heater control circuit, an air conditioner and a control method, aiming to solve the problem of high cost of a protection circuit for protecting a heating circuit.

[0004] In a first aspect, the present invention provides an electric heater control circuit, which is applied to an air conditioner, and the electric heater control circuit includes a control module and a temperature limiting module; the control module is used to be connected to a heating circuit of the air conditioner; the temperature limiting module is connected to the control module, and is used to detect the temperature of the electric heater in the heating circuit; wherein the control module controls the on and off of the heating circuit according to whether the temperature limiting module is on or off.

[0005] Furthermore, the control module includes a detection port, and the detection port is connected to the temperature limiting module.

[0006] Furthermore, the temperature limiting module includes a first temperature limiter, and the first temperature limiter is used to detect the temperature of the electric heater.

[0007] Furthermore, the temperature limiting module also includes a second temperature limiter and a third temperature limiter, and the second temperature limiter and the third temperature limiter are used to detect the air duct temperature of the air conditioner.

[0008] Furthermore, it also includes a temperature sensing module, and the temperature sensing module is connected to the control module.

[0009] Furthermore, the temperature sensing module includes a first temperature sensor and a second temperature sensor, the first temperature sensor is used to detect the inlet air temperature, and the second temperature sensor is used to detect the outlet air temperature.

[0010] In a second aspect, the present invention further provides an air conditioner, comprising a heating circuit and any one of the above-mentioned electric heater control circuits.

[0011] In a third aspect, the present invention provides a control method for controlling the above-mentioned air conditioner, the method comprising:

[0012] If it is detected that the temperature limit module of the electric heater control circuit is disconnected from the control module, the air inlet temperature and the air outlet temperature of the air conditioner are obtained;

[0013] The fault type of the air conditioner is confirmed according to the difference between the inlet air temperature and the outlet air temperature.

[0014] The present invention discloses an air conditioner and a control method. The air conditioner comprises a heating circuit and an electric heater control circuit. The electric heater control circuit comprises a control module and a temperature limiting module. The control module is connected to the temperature limiting module. The temperature limiting module is used to detect the temperature of the electric heater of the heating circuit. By directly connecting the temperature limiting module to the control module, it is avoided to set the temperature limiting module in the heating circuit, so that a small current and low voltage temperature limiter can be used, thereby reducing the cost. At the same time, the specific cause of the temperature increase can be confirmed according to the outlet air temperature and the inlet air temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0016] Figure 1 is a block diagram of an electric heater control circuit provided by an embodiment of the present invention;

[0017] Figure 2 is a circuit diagram of an electric heater control circuit provided by an embodiment of the present invention;

[0018] Figure 3 is a flow chart of a control method provided by an embodiment of the present invention;

[0019] Figure 4 It is a sub-flow chart of a control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, operations, elements, components and / or groups thereof.

[0022] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, the singular forms of "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It should also be further understood that the term "and / or" used in the specification of the present invention and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0023] In addition, the directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only for reference to the directions of the attached drawings and the use status of the product. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0024] like Figure 1 and Figure 2 As shown, Figure 1 is a method schematic diagram of an electric heater control circuit 100 provided by an embodiment of the present invention; Figure 2 1 is a circuit diagram of an electric heater control circuit 100 provided in one embodiment of the present invention. Figure 1 The present invention provides an electric heater control circuit 100, which includes a control module 10 and a temperature limiting module 20; the control module 10 is used to connect to the heating circuit 200 of the air conditioner; the temperature limiting module 20 is connected to the control module 10, and is used to detect the temperature of the electric heater in the heating circuit 200; wherein, the control module 10 controls the on / off of the heating circuit 200 according to whether the temperature limiting module 20 is on or off.

[0025] Specifically, some air conditioners are provided with a heating circuit 200, and the temperature is increased by the heating circuit 200. For air conditioners with higher power, in order to prevent the internal components of the air conditioner from being burned due to excessive temperature, a temperature limiter is generally connected in series in the heating circuit 200, and the electric heater in the heating circuit 200 is protected by the temperature limiter. However, connecting the temperature limiter in series in the electric heater circuit places high demands on the temperature limiter, that is, a high current and high voltage temperature limiter is required, which leads to increased costs. At the same time, since a high current and high voltage temperature limiter is used, a correspondingly higher requirement cable is required, which further increases the cost.

[0026] The electric heater control circuit provided by the present invention is mainly used to control the on and off of the heating circuit 200, so that the temperature is too high and other devices are burned. The electric heater control circuit includes a control module 10 and a temperature limiting module 20. The control module 10 can be provided with a connection port, which is used to connect to the temperature limiting module 20. At the same time, the control module 10 is also connected to the heating circuit 200 to control the on and off of the heating circuit 200.

[0027] The temperature limiting module 20 includes at least one temperature limiter, which is used to detect the temperature of the heating circuit 200. For example, the temperature limiter can be used to detect the temperature of the electric heater of the heating circuit 200. When installed, the temperature limiter can be set on the electric heater. When the temperature limiting module 20 has multiple temperature limiters, the multiple temperature limiters are connected in series, and the series circuit composed of the multiple temperature limiters is connected to the control module 10.

[0028] In actual use, the control module 10 can be arranged on a control board, and a connection port is reserved on the control board, and the connection port is used to connect with the temperature limit module 20. At the same time, a plurality of relays can be arranged on the control board, and the plurality of relays are connected with the heating circuit 200 to control the on and off of the heating circuit 200. Figure 2 As shown, Figure 2 In the figure, AP1 is the control panel, SA123 is the connection port, K3 and K4 are relays, FUT is the thermal fuse, EH1 and EH2 are electric heaters, SAT1, SAT2 and SAT3 are temperature limiters. When the control module 10 detects that the port SA123 is disconnected, the control module 10 disconnects the relays K3 and K4, so that the electric heater stops working to achieve the purpose of protection. In addition, a display panel ( Figure 2 In AP2), the display panel is connected to the control panel and is used to display relevant data information.

[0029] As a further embodiment, the control module 10 includes a detection port, and the detection port is connected to the temperature limiting module 20 .

[0030] Among them, Figure 2 As shown, Figure 2The SA123 connection port in is the detection port, which is connected to the temperature limit module 20. The control module 10 can confirm whether it is disconnected from the temperature limit module 20 through the detection port. In actual use, when the control module 10 detects that it is connected to the temperature limit module 20, the control module 10 maintains the conductive state of the relay K3 and the relay K4, and the electric heater in the heating circuit 200 works normally. When the control module 10 detects that the detection port is disconnected from the temperature limit module 20, the control module 10 turns off the relay K3 and the relay K4, and the electric heater in the heating circuit 200 stops working.

[0031] In addition, the control panel may also be provided with multiple detection ports, and correspondingly multiple temperature limiters may be provided, and the multiple temperature limiters are used to detect the temperature at different positions in the air conditioner. For example, the control panel may be provided with two detection ports, and correspondingly at least two temperature limiters are provided, one of which is connected to one temperature limiter, and the other is connected to the remaining temperature limiters. When the control module 10 detects that any detection port is disconnected, the control module 10 turns off the relay K3 and the relay K4.

[0032] As a further embodiment, the temperature limiting module 20 includes a first temperature limiter, and the first temperature limiter is used to detect the temperature of the electric heater.

[0033] Among them, Figure 2 As shown, Figure 2 SAT1 is the first temperature limiter. The first temperature limiter is used to detect the temperature of the electric heater, and can be set on the electric heater during actual installation. At the same time, the first temperature limiter is also connected to the detection port. When the first temperature limiter is working normally, the control module 10 detects that it is in a normal connection state with the first temperature limiter, then the control module 10 maintains the conduction state of relay K3 and relay K4, and the electric heater works normally. When the first temperature limiter detects that the temperature of the electric heater is too high, the first temperature limiter disconnects from the detection port, and the control module 10 detects that it is disconnected from the first temperature limiter, then the control module 10 turns off relay K3 and relay K4, and the electric heater stops working.

[0034] As a further embodiment, the temperature limiting module 20 further includes a second temperature limiter and a third temperature limiter, and the second temperature limiter and the third temperature limiter are used to detect the air duct temperature of the air conditioner.

[0035] Among them, Figure 2 As shown, Figure 2SAT2 is the second temperature limiter, and SAT3 is the third temperature limiter. The second temperature limiter and the third temperature limiter are used to detect the air duct temperature of the air conditioner. For example, the second temperature limiter can be set on one side of the air duct, and the third temperature limiter can be set on the other side of the air duct. The air duct temperature is detected by the second temperature limiter and the third temperature limiter. When the air duct temperature is too high, the second temperature limiter and the third temperature limiter will be disconnected from the control module 10, and the control module 10 will trigger a protection action to turn off relays K3 and K4.

[0036] In actual use, when the first temperature limiter, the second temperature limiter and the third temperature limiter are all normally connected to the detection port, the control module 10 maintains the conduction of relay K3 and relay K4. When any one of the first temperature limiter, the second temperature limiter and the third temperature limiter is disconnected from the detection port, the control module 10 triggers the protection action, closes relay K3 and relay K4, and thus stops the operation of the electric heater.

[0037] As a further embodiment, a temperature sensing module is further included, and the temperature sensing module is connected to the control module 10. Further, the temperature sensing module includes a first temperature sensor and a second temperature sensor, the first temperature sensor is used to detect the inlet air temperature, and the second temperature sensor is used to detect the outlet air temperature.

[0038] The temperature sensing module can be arranged at the air outlet and the air inlet of the air conditioner, and is used to detect the outlet air temperature of the air outlet and the inlet air temperature of the air inlet respectively, and confirm the specific reason for the temperature rise in the air conditioner according to the inlet air temperature and the outlet air temperature. For example, the temperature sensing module can include a first temperature sensor and a second temperature sensor, and both the first temperature sensor and the second temperature sensor can be temperature sensing bags, which are used to detect the temperature of the environment. The first temperature sensor can be arranged on the evaporator to detect the inlet air temperature, and the second temperature sensor can be arranged on the air duct baffle of the air conditioner to detect the outlet air temperature.

[0039] In actual use, after obtaining the inlet air temperature and the outlet air temperature, the difference between the inlet air temperature and the outlet air temperature is calculated, and the relationship between the difference and the preset threshold is confirmed. The preset threshold refers to the difference between the inlet air temperature and the outlet air temperature when the electric heater of the air conditioner is in a normal state. When the difference between the inlet air temperature and the outlet air temperature is less than the preset threshold, it indicates that the outlet air temperature has not reached its minimum lower limit, and the hot air from the electric heater has not flowed through the air to the second temperature sensor, that is, the hot air supply function of the air conditioner fails and the air conditioner fan is faulty.

[0040] When the difference between the inlet temperature and the outlet temperature is greater than or equal to the preset threshold, it indicates that the outlet temperature has reached its minimum lower limit. The hot air from the electric heater can flow to the second temperature sensor through the air, indicating that the fan is in a normal state. However, due to the blockage of the air outlet, the hot air in the air conditioner cannot be dissipated, which in turn causes the temperature in the air conditioner to rise, triggering the protection action of the temperature limiting module 20. That is, when the difference between the inlet temperature and the outlet temperature is greater than or equal to the preset threshold, the air outlet of the air conditioner is blocked.

[0041] When the air outlet is blocked, after the temperature inside the air conditioner drops, the detection port and the temperature limit module 20 are restored to connection, and the heating circuit 200 works normally. When the temperature inside the air conditioner rises to trigger the protection action of the temperature limit module 20, the control module 10 disconnects relay K3 and relay K4, and repeats the above judgment process. If it is detected that the air outlet is blocked more than the preset number of times, an alarm message can be output and a fault code can be output.

[0042] The present invention also provides an air conditioner, which includes a heating circuit 200 and an electric heater control circuit 100 described in any one of the above embodiments, wherein the electric heater control circuit 100 includes a control module 10 and a temperature limiting module 20; the control module 10 is used to be connected to the heating circuit 200 of the air conditioner; the temperature limiting module 20 is connected to the control module 10, and is used to detect the temperature of the electric heater in the heating circuit 200; wherein the control module 10 controls the on / off of the heating circuit 200 according to whether it is on / off with the temperature limiting module 20.

[0043] Specifically, some air conditioners are provided with a heating circuit 200, and the temperature is increased by the heating circuit 200. For air conditioners with higher power, in order to prevent the internal components of the air conditioner from being burned due to excessive temperature, a temperature limiter is generally connected in series in the heating circuit 200, and the electric heater in the heating circuit 200 is protected by the temperature limiter. However, connecting the temperature limiter in series in the electric heater circuit places high demands on the temperature limiter, that is, a high current and high voltage temperature limiter is required, which leads to increased costs. At the same time, since a high current and high voltage temperature limiter is used, a correspondingly higher requirement cable is required, which further increases the cost.

[0044] The electric heater control circuit provided by the present invention is mainly used to control the on and off of the heating circuit 200, so that the temperature is too high and other devices are burned. The electric heater control circuit includes a control module 10 and a temperature limiting module 20. The control module 10 can be provided with a connection port, which is used to connect to the temperature limiting module 20. At the same time, the control module 10 is also connected to the heating circuit 200 to control the on and off of the heating circuit 200.

[0045] The temperature limiting module 20 includes at least one temperature limiter, which is used to detect the temperature of the heating circuit 200. For example, the temperature limiter can be used to detect the temperature of the electric heater of the heating circuit 200. When installed, the temperature limiter can be set on the electric heater. When the temperature limiting module 20 has multiple temperature limiters, the multiple temperature limiters are connected in series, and the series circuit composed of the multiple temperature limiters is connected to the control module 10.

[0046] In actual use, the control module 10 can be arranged on a control board, and a connection port is reserved on the control board, and the connection port is used to connect with the temperature limit module 20. At the same time, a plurality of relays can be arranged on the control board, and the plurality of relays are connected with the heating circuit 200 to control the on and off of the heating circuit 200. Figure 2 As shown, Figure 2 In the figure, AP1 is the control panel, SA123 is the connection port, K3 and K4 are relays, FUT is the thermal fuse, EH1 and EH2 are electric heaters, SAT1, SAT2 and SAT3 are temperature limiters. When the control module 10 detects that the port SA123 is disconnected, the control module 10 disconnects the relays K3 and K4, so that the electric heater stops working to achieve the purpose of protection. In addition, a display panel ( Figure 2 In AP2), the display panel is connected to the control panel and is used to display relevant data information.

[0047] See also Figure 3 The present invention provides a control method, which is used to control the air conditioner described in any one of the above embodiments, and is used to control the on and off of the heating circuit. The control method includes S110-S120.

[0048] S110, if it is detected that the temperature limit module of the electric heater control loop is disconnected from the control module, the air inlet temperature and the air outlet temperature of the air conditioner are obtained.

[0049] In an embodiment of the present invention, the air conditioner may include a heating circuit and an electric heater control circuit. The electric heater control circuit is mainly used to control the on and off of the heating circuit, so that other components are burned due to excessive temperature. The electric heater control circuit includes a control module, a temperature limiting module and a temperature sensing module. The control module may be provided with a connection port, which is used to connect to the temperature limiting module. At the same time, the control module is also connected to the heating circuit to control the on and off of the heating circuit. The temperature limiting module includes at least one temperature limiter, which is used to detect the temperature of the heating circuit. For example, the temperature limiter can be used to detect the temperature of the electric heater of the heating circuit. When installing, the temperature limiter can be set on the electric heater. When the temperature limiting module has multiple temperature limiters, the multiple temperature limiters are connected in series with each other, and the series circuit composed of the multiple temperature limiters is connected to the control module.

[0050] The temperature sensing module can be arranged at the air outlet and the air inlet of the air conditioner, and is used to detect the outlet air temperature of the air outlet and the inlet air temperature of the air inlet respectively, and confirm the specific reason for the temperature rise in the air conditioner according to the inlet air temperature and the outlet air temperature. For example, the temperature sensing module can include a first temperature sensor and a second temperature sensor, and both the first temperature sensor and the second temperature sensor can be temperature sensing bags, which are used to detect the temperature of the environment. The first temperature sensor can be arranged on the evaporator, and is used to detect the inlet air temperature, and the second temperature sensor can be arranged on the air duct baffle of the air conditioner, and is used to detect the outlet air temperature.

[0051] When the temperature limit module is normally connected to the control module, the control module maintains the channel of the heating circuit, and the electric heater is in normal working state. At this time, the temperature in the air conditioner will gradually rise. If all components of the air conditioner are in normal state, the temperature in the air conditioner will be maintained within a range and will not trigger the protection action of the temperature limit module. When the temperature limit module is disconnected from the control module, the control module controls the heating circuit to stop working and the electric heater to turn off. At the same time, the air inlet temperature and air outlet temperature of the air conditioner can also be obtained through the temperature sensing module.

[0052] S120: Confirm the fault type of the air conditioner according to the difference between the inlet air temperature and the outlet air temperature.

[0053] In an embodiment of the present invention, when the air conditioner is in a normal working state, its inlet air temperature and outlet air temperature are maintained within a range. For example, the difference between the inlet air temperature and the outlet air temperature may be between 8°C and 45°C. Taking 8°C as an example, when the difference between the obtained outlet air temperature and the inlet air temperature is greater than 8°C or less than or equal to 8°C, it indicates that the air conditioner has a corresponding fault.

[0054] See also Figure 4 In some embodiments, such as in this embodiment, step S120 may include steps S121-S122.

[0055] S121, if the difference between the inlet air temperature and the outlet air temperature is less than a preset threshold, outputting a first alarm message, wherein the first alarm message is used to indicate that a fan of the air conditioner is faulty;

[0056] S122: If the difference between the inlet air temperature and the outlet air temperature is greater than or equal to the preset threshold, a second alarm message is output, wherein the second alarm message is used to indicate that the air outlet of the air conditioner is blocked.

[0057] In the embodiment of the present invention, after obtaining the inlet air temperature and the outlet air temperature, the difference between the inlet air temperature and the outlet air temperature is calculated, and the relationship between the difference and the preset threshold is confirmed. The preset threshold refers to the difference between the inlet air temperature and the outlet air temperature when the electric heater of the air conditioner is in a normal state. When the difference between the inlet air temperature and the outlet air temperature is less than the preset threshold, it indicates that the outlet air temperature has not reached its minimum lower limit value, and the hot air of the electric heater has not flowed to the second temperature sensor through the air, that is, the hot air supply function of the air conditioner fails, and the fan of the air conditioner is faulty.

[0058] When the difference between the inlet temperature and the outlet temperature is greater than or equal to the preset threshold, it indicates that the outlet temperature has reached its minimum lower limit. The hot air from the electric heater can flow to the second temperature sensor through the air, indicating that the fan is in a normal state. However, due to the blockage of the air outlet, the hot air in the air conditioner cannot dissipate, which in turn causes the temperature in the air conditioner to rise, triggering the protection action of the temperature limiting module. That is, when the difference between the inlet temperature and the outlet temperature is greater than or equal to the preset threshold, the air outlet of the air conditioner is blocked.

[0059] When the air outlet is blocked, after the temperature inside the air conditioner drops, the detection port and the temperature limit module are restored to connection, and the heating circuit works normally. When the temperature inside the air conditioner rises to trigger the protection action of the temperature limit module, the control module disconnects relay K3 and relay K4 and repeats the above judgment process. If it is detected that the air outlet is blocked more than the preset number of times, an alarm message can be output and a fault code can be output.

[0060] In actual use, taking the preset threshold of 8°C as an example, if the inlet temperature is 15°C and the outlet temperature is 30°C, the difference between the inlet temperature and the outlet temperature is 15°C. At this time, the difference is greater than the preset threshold, indicating that the outlet temperature is too high and the outlet is blocked. If the inlet temperature is 15°C and the outlet temperature is 20°C, the difference between the inlet temperature and the outlet temperature is 5°C. At this time, the difference is less than the preset threshold, indicating that the fan is faulty.

[0061] The electric heater control circuit, air conditioner and control method disclosed in the present invention connect the temperature limiting module to the control module separately, so that a low-power and low-voltage temperature limiter can be used, thereby reducing costs. At the same time, the specific cause of the air conditioner failure can be confirmed by the inlet air temperature and the outlet air temperature when the protection action of the temperature limiting module is triggered.

[0062] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. An electric heater control circuit, characterized in that: Applied to air conditioners, including: A control module, the control module being used to be connected to a heating circuit of the air conditioner; A temperature limiting module, which is connected to the control module and is used to detect the temperature of the electric heater in the heating circuit; Wherein, the control module controls the on / off of the heating circuit according to whether the temperature limiting module is on or off.

2. The electric heater control circuit according to claim 1, characterized in that: The control module includes a detection port, and the detection port is connected to the temperature limiting module.

3. The electric heater control circuit according to claim 2, characterized in that: The temperature limiting module includes a first temperature limiter, and the first temperature limiter is used to detect the temperature of the electric heater.

4. The electric heater control circuit according to claim 3, characterized in that: The temperature limiting module further includes a second temperature limiter and a third temperature limiter, and the second temperature limiter and the third temperature limiter are used to detect the air duct temperature of the air conditioner.

5. The electric heater control circuit according to claim 1, characterized in that: It also includes a temperature sensing module, which is connected to the control module.

6. The electric heater control circuit according to claim 5, characterized in that: The temperature sensing module includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is used to detect an inlet air temperature, and the second temperature sensor is used to detect an outlet air temperature.

7. An air conditioner, characterized in that: It comprises a heating circuit and an electric heater control circuit as claimed in any one of claims 1 to 6.

8. A control method, characterized in that: For controlling the air conditioner according to claim 7, the method comprising: If it is detected that the temperature limit module of the electric heater control circuit is disconnected from the control module, the air inlet temperature and the air outlet temperature of the air conditioner are obtained; The fault type of the air conditioner is confirmed according to the difference between the inlet air temperature and the outlet air temperature.

9. The method according to claim 8, characterized in that The step of confirming the fault type of the air conditioner according to the difference between the inlet air temperature and the outlet air temperature comprises: If the difference between the inlet air temperature and the outlet air temperature is less than a preset threshold, a first alarm message is output, wherein the first alarm message is used to indicate that a fan of the air conditioner is faulty.

10. The method according to claim 9, characterized in that The step of confirming the fault type of the air conditioner according to the difference between the inlet air temperature and the outlet air temperature further includes: If the difference between the inlet air temperature and the outlet air temperature is greater than or equal to the preset threshold, a second alarm message is output, wherein the second alarm message is used to indicate that the air outlet of the air conditioner is blocked.

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