Control method for activating heating function, controller, and air conditioning system

Abstract

The present application discloses a control method for activating a heating function, a controller, and an air conditioning system. The control method for activating the heating function is applied to a flammable refrigerant air conditioning system, and comprises: in response to a heating function activation instruction, controlling a fan to perform a self-test operation and a self-test halt (S100); after the fan successfully completes the self-test operation and the self-test halt, controlling the fan to activate normal operation (S200); and after controlling the fan to operate normally for a first duration, activating a heating assembly in accordance with the heating function activation instruction (S300).

Description

Method for activating heating function, controller and air conditioning system

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411182354.2, filed on August 26, 2024, entitled "Method for Activating Heating Function, Controller and Air Conditioning System", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of air conditioning system control technology, and in particular to a method for starting a heating function, a controller, and an air conditioning system. Background Technology

[0004] Some air conditioning systems on the market use a combustible refrigerant cycle for heat exchange and are equipped with heating elements. When these air conditioning systems receive a command to activate the heating function, the heating elements work and generate heat, which is then blown out by the air conditioning system's fan to quickly raise the indoor temperature.

[0005] When the heating function is activated, the air conditioning system first starts the fan, and then starts the heating element after a period of time. During this process, if the fan speed does not reach the speed required for the heating function, and there is previously leaked flammable refrigerant near the heating element, the heating element will burn dry, which may cause the flammable refrigerant to ignite due to excessively high temperature, resulting in safety issues. Summary of the Invention

[0006] The embodiments of this application provide a method for controlling the activation of a heating function, a controller, and an air conditioning system, which can ensure the safe use of the heating function.

[0007] In a first aspect, embodiments of this application provide a method for starting a heating function, applied to a combustible refrigerant air conditioning system, the combustible refrigerant air conditioning system including a heating component and a fan; the starting control method includes:

[0008] In response to the command to activate the heating function, the fan is controlled to perform self-test operation and self-test shutdown.

[0009] After the fan has passed its self-test operation and self-test shutdown, control the fan to start and run normally; and

[0010] After the fan has been running normally for a first period of time, the heating component is activated according to the heating function activation command.

[0011] In some embodiments, controlling the self-test operation and self-test shutdown of the fan includes:

[0012] The fan is controlled to perform self-test operation using multiple target speeds;

[0013] After passing the self-test at all the target speeds, the fan self-tests and stops at the target stop duration; and

[0014] After the self-test of the shutdown period based on the target shutdown duration passes, the fan is controlled to start and run normally.

[0015] In some embodiments, controlling the fan self-test operation with multiple target speeds includes:

[0016] Determine the order in which the target rotational speed is used during self-test operation; and

[0017] The target speed is set sequentially according to the usage order, the fan is controlled to rotate according to the currently used target speed, and it is determined whether the actual speed of the fan can reach the currently used target speed.

[0018] In some embodiments, determining whether the actual rotational speed of the fan can reach the currently used target rotational speed includes:

[0019] Obtain the actual rotational speed of the fan and determine the i-th target rotational speed currently in use, where i is a positive integer;

[0020] If the actual rotational speed of the fan reaches the i-th target rotational speed within the second time period, it is determined that the fan has passed the self-test operation at the i-th target rotational speed, and then the fan rotation is controlled at the (i+1)-th target rotational speed; and

[0021] If the actual speed of the fan cannot reach the i-th target speed within the second time period, the self-test operation of the fan will be stopped and a fault prompt will be issued.

[0022] In some embodiments, the target rotational speeds are arranged from largest to smallest according to the order of use, or the last target rotational speed in the order of use is the lowest rotational speed at which the wind turbine operates.

[0023] In some embodiments, controlling the fan self-test shutdown with a target shutdown duration includes:

[0024] Control the fan to enter emergency stop mode and start timing;

[0025] The timing ends when the fan stops, and the actual downtime is obtained.

[0026] If the actual downtime is less than or equal to the target downtime, the fan self-test shutdown is deemed to have passed; and

[0027] If the actual shutdown time is longer than the target shutdown time, the fan self-test shutdown is determined to be a failure.

[0028] In some embodiments, controlling the fan self-test shutdown with a target shutdown duration includes:

[0029] Control the fan to enter emergency stop mode;

[0030] After entering the emergency stop mode and waiting for the target stop time, the actual rotational speed of the fan is obtained;

[0031] If the actual speed of the fan is zero, the fan self-test shutdown is deemed to have passed; and

[0032] If the actual rotational speed of the fan is not zero, the fan self-test shutdown is determined to be a failure.

[0033] In some embodiments, controlling the fan to enter an emergency stop mode includes:

[0034] The fan operation is controlled by inputting a preset reverse current; and

[0035] The target stop duration is determined based on the preset reverse current and the last target rotational speed.

[0036] In a second aspect, embodiments of this application provide a controller, including at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the start-up control method for the heating function as described in any one of claims 1 to 8.

[0037] Thirdly, embodiments of this application also provide an air conditioning system, including a heating element, a fan, and a controller as described in the second aspect.

[0038] The heating function activation control method, controller, and air conditioning system of this application have at least the following beneficial effects: In response to the heating function activation command, the fan is controlled to perform self-test operation and self-test shutdown, ensuring that the fan reaches the target speed required by the heating function and is fully controlled. This prevents fan failure and / or insufficient fan speed to dissipate the heat generated by the heating element in time, leading to excessively high air temperature around the heating element and dry burning. This effectively avoids the ignition of leaked flammable refrigerant near the heating element due to excessive temperature, improving the safety of the air conditioning system operation. In the embodiments of this application, the fan is controlled to start normal operation only after the fan has passed the self-test operation and self-test shutdown. After the fan has been running normally for a first period, the heating element is activated according to the heating function activation command. The heating element generates heat during the heating process, causing the air temperature around the heating element to rise. The fan blows out the heated air, quickly raising the indoor temperature and meeting the heating demand of the air conditioning system.

[0039] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description and the accompanying drawings. Attached Figure Description

[0040] Figure 1 is a flowchart of a method for controlling the activation of a heating function according to an embodiment of this application;

[0041] Figure 2 is a flowchart of a method for controlling the self-test operation and self-test shutdown of a fan according to an embodiment of this application;

[0042] Figure 3 is a flowchart of a method for controlling the self-test operation of a fan with multiple target speeds according to an embodiment of this application;

[0043] Figure 4 is a flowchart of a method for monitoring whether the actual rotational speed of a fan can fully reach the target rotational speed, according to an embodiment of this application.

[0044] Figure 5 is a flowchart of a method for controlling the self-test shutdown of a fan based on a target shutdown duration, provided by an embodiment of this application.

[0045] Figure 6 is a flowchart of a method for controlling the self-test shutdown of a fan with a target shutdown duration according to another embodiment of this application;

[0046] Figure 7 is a flowchart of a method for controlling a fan to enter an emergency stop mode according to an embodiment of this application;

[0047] Figure 8 is a flowchart of a start-up control method for an electric auxiliary heating component or a heater provided in another embodiment of this application;

[0048] Figure 9 is a sequence diagram of the operation of a fan, electric auxiliary heating assembly, or furnace provided in an embodiment of this application.

[0049] Figure 10 is a schematic diagram of the controller provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various implementations. Simultaneously, the steps or actions described in the method description can be rearranged or adjusted in a manner readily apparent to those skilled in the art. Therefore, the various orders in the specification and drawings are merely for the clear description of a particular embodiment and do not imply a mandatory order, unless otherwise stated that a particular order must be followed.

[0051] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0052] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0053] Some air conditioning systems on the market use a combustible refrigerant cycle for heat exchange and are equipped with heating elements. When these systems receive a heating function command, the air conditioning fan starts and runs, and then the heating elements work to generate heat, raising the temperature of the air around the heating elements. The air conditioning fan then blows out the warmed air, which can quickly raise the indoor temperature.

[0054] In related technologies, when the heating function is activated, the air conditioning system first starts the fan, which then runs continuously for a period of time. After this period, the heating element is activated, generating heat, which is then blown out by the fan to raise the indoor temperature. However, if the fan operates at a low speed, failing to meet the requirements for the heating function, the heat generated by the heating element may not be blown out in time. This results in higher air temperatures around the heating element. If there is any previously leaked flammable refrigerant near the heating element, it may dry-burn, potentially igniting the refrigerant and causing a safety hazard.

[0055] Based on this, embodiments of this application provide a heating function start-up control method, controller, and air conditioning system. In response to the heating function start-up command, the system controls the fan to perform self-test operation and self-test shutdown, ensuring the fan reaches the target speed required for the heating function and is fully controlled. This prevents fan failure and / or insufficient fan speed to dissipate heat generated by the heating element, leading to excessively high air temperatures around the heating element and potential dry burning. This effectively avoids the ignition of leaked flammable refrigerant near the heating element due to excessive temperature, improving the safety of the air conditioning system. In embodiments of this application, the fan is only started normally after successful self-test operation and self-test shutdown. After a first period of normal fan operation, the heating element is activated according to the heating function start-up command. During operation, the heating element generates heat, raising the air temperature around it. The fan blows out the heated air, quickly increasing the indoor temperature and meeting the heating demand of the air conditioning system.

[0056] The following description, with reference to the accompanying drawings, explains the activation control method for the heating function, the controller, and the air conditioning system:

[0057] Referring to Figure 1, which is a flowchart of a method for controlling the activation of a heating function according to an embodiment of this application, the method includes, but is not limited to, steps S100 to S300. Specifically,

[0058] Step S100: In response to the heating function start command, control the fan to perform self-test operation and self-test stop;

[0059] Step S200: After the fan has passed the self-test operation and self-test shutdown, control the fan to start and run normally;

[0060] Step S300: After the control fan has been running normally for the first time, start the heating component according to the heating function start command.

[0061] In some embodiments of this application, the start-up control method for the heating function is applied to a combustible refrigerant air conditioning system. The combustible refrigerant air conditioning system includes a heating element and a fan. The heating element is a heating device, typically used as a supplementary heat source for the combustible refrigerant air conditioning system. The heating element provides additional heat to meet the heating demand of the air conditioning system when it cannot provide sufficient heat. The start-up control method for the heating function includes: in response to the start-up command of the heating function, firstly controlling the fan to perform self-check operation and self-check shutdown. The fan self-check operation ensures that the fan can operate normally and reach the target speed required by the heating function, preventing fan failure and / or insufficient fan speed to dissipate the heat generated by the heating element, which could lead to excessively high air temperature around the heating element and dry burning. This effectively avoids the ignition of leaked combustible refrigerant near the heating element due to excessive temperature, improving the safety of the air conditioning system operation. The fan self-check shutdown ensures that the fan is fully controlled. In response to the shutdown command of the heating function, the fan stops rotating promptly, preventing the fan from continuing to run after the heating element is shut down, which would cause cold air to be blown out and affect the indoor temperature. In the embodiments of this application, the fan is controlled to start normal operation only after the fan has passed self-test operation and self-test shutdown. After the fan has been controlled to start normal operation for a first period of time, the heating component is activated according to the heating function start command. The heating component generates heat during the heating process, which raises the temperature of the air around the heating component. The fan blows out the heated air, which can quickly raise the indoor temperature and meet the heating demand of the air conditioning system.

[0062] In the embodiments of this application, in response to the heating function start command, and before starting the heating component, the fan is first controlled to perform self-test operation and self-test stop. By controlling the fan's self-test operation and self-test stop, it is ensured that the fan is in a normal and controllable state, and that the fan speed is the target speed that meets the heating function requirements. This prevents the heating component from burning out due to fan failure or the fan's inability to reach the target speed, avoiding safety issues caused by the heating component burning out if there was a leak of flammable refrigerant in the pipeline. By ensuring that the fan is in a controllable state, it is ensured that the fan can stop rotating in response to the heating function stop command, preventing the blowing out of cold air from affecting the indoor temperature, thereby ensuring the heating effect of the air conditioning system and improving the user experience. If the fan's self-test operation and self-test stop fail, the heating component will not be started, preventing safety issues caused by the heating component burning out if there is a leak of flammable refrigerant in the pipeline, thus improving the safety of the air conditioning system.

[0063] The heating function start command refers to the command to activate the heating component. This command triggers the air conditioner to initially not activate the heating component normally, but instead controls the fan to perform self-test operation and then self-test shutdown. After the fan has been running normally for a first period of time, the heating component will then activate normally. The heating function start command can be issued by the user through a remote control, mobile phone terminal, or other control devices. The user can also time the heating function to activate at the designated time, or the air conditioner can automatically activate it when it detects that the environment meets predetermined conditions (e.g., the indoor temperature is below a certain value), and so on. In short, after receiving the heating function start command, the air conditioner activates the heating function according to the methods described in steps S100 to S300 above.

[0064] In addition, the normal start of the fan in step S200 is different from the self-test operation and self-test stop mentioned above. It means that the fan runs at the speed corresponding to the heating function start command. At this time, the fan works at a constant speed or at a speed that changes according to a certain pattern. The speed corresponding to the heating function start command is related to the heating power of the heating component. For example, the higher the heating power, the higher the speed corresponding to the normal start of the fan. The speed corresponding to the heating function start command can also be a speed set by the user, and so on.

[0065] It should be noted that in some embodiments of this application, the first duration is one of 30 seconds, 60 seconds, and 90 seconds. In one embodiment, the first duration is 60 seconds. After the fan self-test operation and self-test shutdown have both passed, the fan is controlled to start normal operation. After the fan has been running normally for 60 seconds, the heating component is activated according to the heating function start command. By activating the heating component only after the fan has been running normally for 60 seconds, it is ensured that the heating component is activated only when the fan has reached a stable operating state. The fan and the heating component work together to achieve a better heating effect and meet the heating demand of the air conditioning system. Those skilled in the art can set the first duration according to actual conditions. The embodiments of this application do not limit the size of the first duration.

[0066] It should be noted that the heating components of the air conditioning system in this application include an electric auxiliary heating component and / or a furnace. The electric auxiliary heating component generates heat by means of electricity, while the furnace generates heat by means of fuel combustion. In some air conditioning systems based on combustible refrigerants, one of the above-mentioned electric auxiliary heating component and furnace may be configured. In this embodiment, the method for starting the heating function includes: after the fan has passed self-test operation and self-test shutdown, controlling the fan to start normal operation; after the fan has been controlled to start normal operation for a first period of time, starting the electric auxiliary heating component or starting the furnace according to the heating function start command. If the air conditioning system based on combustible refrigerant is configured with both the above-mentioned electric auxiliary heating component and furnace, and each of the electric auxiliary heating component and furnace is configured with a corresponding fan, then the method for starting the heating function in this embodiment includes: after the fans of the electric auxiliary heating component and furnace have passed self-test operation and self-test shutdown, controlling the fans of both to start normal operation; after the fans of both to start normal operation for a first period of time, starting the electric auxiliary heating component and furnace according to the heating function start command.

[0067] Referring to Figure 2, which is a flowchart of a method for controlling the self-test operation and self-test shutdown of a fan according to an embodiment of this application, the method includes, but is not limited to, steps S110 to S130. Specifically,

[0068] Step S110: Control the fan to perform self-test operation with multiple target speeds;

[0069] Step S120: After the self-test runs through all target speeds, control the fan to stop for self-test based on the target stop duration;

[0070] Step S130: After the self-check of the shutdown time based on the target shutdown duration passes, control the fan to start and run normally.

[0071] In some embodiments of this application, the method for controlling the self-test operation and self-test shutdown of the fan includes: controlling the self-test operation of the fan with multiple target speeds, the fan running according to each target speed to ensure the performance and safety of the fan under different speed conditions. It is understood that the target speeds include, but are not limited to, 300 rpm, 600 rpm, 900 rpm, 1200 rpm, and 1500 rpm. During the process of controlling the self-test operation of the fan, the fan is controlled to gradually accelerate from a stopped state to one of the target speeds and run at that target speed for a preset time. Then, it gradually accelerates or decelerates to the next target speed and runs for a preset time. Then, it gradually accelerates or decelerates to the next target speed, thereby traversing each target speed to achieve the control of the fan self-test operation with multiple target speeds. After successfully completing self-tests at all target speeds, the fan is controlled to stop for the target stop duration. This ensures that the fan responds to shutdown commands from the electric auxiliary heating components or boiler within the target stop time, preventing the fan from continuing to run and blowing out cold air, thus affecting the indoor temperature. After the fan has successfully completed self-tests at all target speeds and for the target stop duration, the fan is restarted normally.

[0072] In this embodiment, the fan is only started and operated normally after it has passed self-testing at all target speeds and after passing self-testing shutdown for the target shutdown duration. This ensures that the fan is in a normal and controllable state, and also ensures that the fan speed meets the target speed requirements of the electric auxiliary heating function or the heater function. By ensuring that the fan is in a controllable state, it is ensured that the fan can stop rotating in response to the shutdown command of the electric auxiliary heating component or the heater, preventing the blowing out of cold air from affecting the indoor temperature, thereby ensuring the heating effect of the air conditioning system and improving the user experience.

[0073] It should be noted that in some embodiments of this application, the target rotational speed includes, but is not limited to, 300 rpm, 600 rpm, 900 rpm, 1200 rpm, and 1500 rpm. The embodiments of this application do not limit the magnitude of the target rotational speed, and those skilled in the art can set the magnitude of the target rotational speed according to the actual situation.

[0074] It should be noted that in some embodiments of this application, the preset duration is 5 seconds. During the self-test operation of the control fan, the control fan runs at each target speed for 5 seconds, and then gradually accelerates or decelerates to the next target speed. The embodiments of this application do not limit the size of the preset duration. Those skilled in the art can set the size of the preset duration according to the actual situation.

[0075] In one embodiment, the target speeds include 300 rpm, 600 rpm, 900 rpm, 1200 rpm, and 1500 rpm. Controlling the fan's self-test operation at multiple target speeds includes: gradually accelerating the fan from a stopped state to 300 rpm and running it at 300 rpm for 5 seconds; then gradually accelerating the fan to 600 rpm and running it at 600 rpm for 5 seconds; then gradually accelerating the fan to 1200 rpm and running it at 1200 rpm for 5 seconds; then gradually decelerating the fan to 900 rpm and running it at 900 rpm for 5 seconds; and finally gradually accelerating the fan to 1500 rpm and running it at 1500 rpm for 5 seconds. This process iterates through each target speed, thereby achieving fan self-test operation controlled at multiple target speeds. It should be noted that during the process of controlling the fan to change from the current speed to the next target speed, the magnitude of the next target speed is not limited, and those skilled in the art can set the conversion order of the target speeds according to the actual situation. By controlling the fan's self-test operation with multiple target speeds, the performance and safety of the fan under different speed conditions can be ensured, thereby guaranteeing that the fan is operating normally and is fully controlled, and improving the reliability of the air conditioning system.

[0076] Referring to Figure 3, which is a flowchart of a method for controlling a fan's self-test operation with multiple target speeds according to an embodiment of this application, the method includes, but is not limited to, steps S111 to S112. Specifically,

[0077] Step S111: Determine the order in which the target speed is used during the self-test operation;

[0078] Step S112: Set the target speed in sequence according to the usage order, control the fan rotation according to the current target speed, and determine whether the actual speed of the fan can reach the current target speed.

[0079] In some embodiments of this application, controlling the self-test operation of the fan requires controlling the fan self-test operation with multiple target speeds. The method for controlling the fan self-test operation with multiple target speeds includes: first, determining the order in which each target speed is used during the self-test operation; then, controlling the fan to rotate according to the target speeds corresponding to the determined order of use; and during the process of controlling the fan to rotate according to the target speeds corresponding to the determined order of use, monitoring whether the actual speed of the fan in each operating stage can reach the target speed. If, during the process of controlling the fan to rotate according to the target speeds corresponding to the determined order of use, the actual speed of the fan in each operating stage can reach the target speed, then it is determined that the self-test operation with all target speeds has passed.

[0080] In some embodiments of this application, the target rotational speeds are arranged from largest to smallest in the order of use, or the last target rotational speed in the order of use is the lowest rotational speed at which the fan operates.

[0081] The target speeds include multiple speeds of different magnitudes, including but not limited to 300 rpm, 600 rpm, 900 rpm, 1200 rpm, and 1500 rpm. After confirming that the self-test operation at all target speeds has passed, the fan self-test stop is controlled by the target stop duration to further determine whether the fan self-test stop has passed. Based on the fan self-test operation results and the fan self-test stop results, it is determined whether the fan is under control. To save energy consumption in the air conditioning system, the embodiments of this application arrange the target speeds during fan self-test operation from largest to smallest according to the order of use. This results in a lower speed for the last target speed during the fan self-test operation, thus reducing the energy consumption required for the fan self-test stop and shortening the time required for the fan self-test stop. This improves the efficiency of the fan self-test stop, accelerates the entry of the electric auxiliary heating components or heater into normal operating heating state, and thus accelerates the heating response of the air conditioning system.

[0082] Understandably, during the self-test operation, the target speeds of the fan are arranged in descending order of usage. This includes determining the usage order of the target speeds during the self-test operation as 1500rpm, 1200rpm, 900rpm, 600rpm, and 300rpm. The fan is controlled to gradually accelerate from a stop state to 1500rpm and run at 1500rpm for 5 seconds. Then, the fan speed is controlled to gradually decelerate to 1200rpm and run at 1200rpm for 5 seconds. Next, the fan speed is controlled to gradually decelerate to 900rpm and run at 900rpm for 5 seconds. Then, the fan speed is controlled to gradually decelerate to 600rpm and run at 600rpm for 5 seconds. Finally, the fan speed is controlled to gradually decelerate to 300rpm and run at 300rpm for 5 seconds. This process iterates through each target speed, thereby enabling the fan to be controlled for self-test operation at multiple target speeds.

[0083] In another embodiment, the target speed includes multiple speeds of different magnitudes, including but not limited to 300 rpm, 600 rpm, 900 rpm, 1200 rpm, and 1500 rpm; wherein, 300 rpm is the rated minimum speed of the fan. In the embodiment of this application, the rated minimum speed of the fan, 300 rpm, is determined as the last target speed in the usage sequence of the target speed during the self-test operation. The fan is controlled to gradually accelerate from a stopped state to any target speed other than 300 rpm, and run at that target speed for 5 seconds. Then, the fan is controlled to gradually accelerate or decelerate to the next target speed. During the process of controlling the fan to change from the current speed to the next target speed, there is no restriction on the magnitude of the next target speed. Those skilled in the art can set the usage sequence of the target speeds according to the actual situation, as long as it is ensured that the last target speed in the usage sequence is the minimum speed at which the fan runs. By setting the last target speed in the usage sequence to the minimum operating speed of the fan, i.e., the rated minimum speed of the fan, the energy consumption required for the fan's self-check and shutdown process can be reduced after the fan completes the self-check operation at the last target speed and confirms that the self-check operation at all target speeds has passed. This reduces the energy consumption of the air conditioning system by controlling the fan's self-check and shutdown process with the target shutdown duration. At the same time, the time required for the fan's self-check and shutdown is also shortened, improving the efficiency of the fan's self-check and shutdown process. This also speeds up the entry of the electric auxiliary heating components or heater into the normal operating heating state, thereby accelerating the heating response of the air conditioning system.

[0084] Referring to Figure 4, which is a flowchart of a method for monitoring whether the actual rotational speed of a fan can fully reach the target rotational speed according to an embodiment of this application, the method includes, but is not limited to, steps S113 to S115. Specifically,

[0085] Step S113: Obtain the actual rotational speed of the fan and determine the i-th target rotational speed currently in use, where i is a positive integer;

[0086] Step S114: If the actual speed of the fan reaches the i-th target speed within the second time period, determine that the fan has passed the self-test operation of the i-th target speed, and then control the fan to rotate at the (i+1)-th target speed.

[0087] Step S115: If the actual speed of the fan cannot reach the i-th target speed within the second time period, stop the fan's self-test operation and issue a fault prompt.

[0088] In some embodiments of this application, during the self-test operation of the fan controlled by multiple target speeds, the fan is controlled to rotate according to the target speeds corresponding to the usage sequence, and the actual speed of the fan is monitored to see if it can reach all the target speeds. When the actual speed of the fan in each operating stage is detected to reach the target speed, it is determined that the self-test operation with all target speeds has passed. It is understood that the usage sequence includes the order in which the target speeds are used and the runtime corresponding to each target speed. The usage sequence includes the first target speed, the second target speed, ... the i-th target speed, ... the N-th target speed; it is understood that the second runtime corresponds to the i-th target speed, the third runtime corresponds to the (i+1)-th target speed, and so on. The method for monitoring whether the actual speed of the fan can reach the target speed includes: First, obtaining the current actual speed of the fan and determining the i-th target speed currently in use, where i is an integer. If the current actual speed of the fan reaches the i-th target speed within a second time period, it is determined that the current actual speed of the fan is consistent with the target speed corresponding to the second time period in the usage sequence. This confirms that the fan has passed the self-test operation at the i-th target speed. Then, the fan is controlled to rotate at the (i+1)-th target speed to confirm whether the actual speed of the fan can reach the (i+1)-th target speed in the usage sequence. Alternatively, if the current actual speed of the fan cannot reach the i-th target speed within a second time period, it is determined that the current actual speed is inconsistent with the target speed corresponding to the second time period in the usage sequence. This confirms that the fan has not passed the self-test operation at the i-th target speed. In this case, the self-test operation of the fan is stopped and a fault prompt is issued.

[0089] By setting the usage sequence of target speeds and the corresponding runtime for multiple target speeds in the usage sequence (e.g., the second runtime corresponds to the i-th target speed), the system obtains the actual fan speed and determines whether the actual fan speed within the second runtime matches the i-th target speed within the usage sequence. If they match, the i-th target speed self-test operation is considered successful, and the self-test operation for the (i+1)-th target speed continues. If they do not match, the i-th target speed self-test operation is considered unsuccessful, the self-test operation is stopped, and a fault warning is issued. This improves fault diagnosis capabilities, allowing users to identify a fan malfunction and promptly shut down the air conditioner. This prevents the electric auxiliary heating components or heater from burning dry due to fan malfunction or the fan failing to reach the target speed, thus avoiding safety issues caused by the ignition of leaked flammable refrigerant in the pipes and improving the safety of the air conditioning system.

[0090] It should be noted that in some embodiments of this application, if the actual rotational speed of the fan reaches the i-th target rotational speed within the second time period, it is determined that the fan has passed the self-test operation at the i-th target rotational speed, and then the fan is controlled to rotate at the (i+1)-th target rotational speed; if the actual rotational speed of the fan cannot reach the i-th target rotational speed within the second time period, the self-test operation of the fan is stopped and a fault prompt is issued. Those skilled in the art can set the size of the second time period according to the actual situation, and the embodiments of this application do not limit the size of the second time period.

[0091] It should be noted that in some embodiments of this application, it is determined that the fan has passed the self-test operation of the i-th target speed, and then the fan is controlled to rotate at the (i+1)-th target speed. The current actual speed of the fan is obtained. If the actual speed of the fan reaches the (i+1)-th target speed within the third time period, it is determined that the fan has passed the self-test operation of the (i+1)-th target speed. Those skilled in the art can set the size of the third time period according to the actual situation. The embodiments of this application do not limit the size of the third time period.

[0092] Referring to Figure 5, which is a flowchart of a method for controlling a fan self-test shutdown with a target shutdown duration according to an embodiment of this application, the method includes, but is not limited to, steps S121 to S124. Specifically,

[0093] Step S121: Control the fan to enter emergency stop mode and start timing;

[0094] Step S122: End the timer when the fan stops to obtain the actual downtime;

[0095] Step S123: If the actual shutdown time is less than or equal to the target shutdown time, the fan self-test shutdown is confirmed to have passed;

[0096] Step S124: If the actual shutdown time is longer than the target shutdown time, the fan self-test shutdown fails.

[0097] In some embodiments of this application, after confirming that the self-test operation at all target speeds has passed, the fan is controlled to stop for a target stop duration. This further determines whether the fan self-test stop has passed, and whether the fan is under control is determined based on the fan self-test operation results and the fan self-test stop results. Controlling the fan self-test stop with the target stop duration includes: controlling the fan to enter an emergency stop mode and starting a timer; ending the timer when the fan completely stops rotating, thereby determining the actual stop duration required for the fan to stop. The actual stop duration required for the fan to stop is compared with a preset target stop duration. If the actual stop duration required for the fan to stop is less than or equal to the target stop duration, the fan self-test stop is determined to have passed; if the actual stop duration required for the fan to stop is greater than the target stop duration, the fan self-test stop is determined to have failed.

[0098] During the self-test shutdown process of the controlled fan, the actual shutdown time required for the fan to stop is determined. This actual shutdown time is then compared with a preset target shutdown time to determine if the fan self-test shutdown passes. If the actual shutdown time required is less than or equal to the preset target shutdown time, it indicates that the fan can completely stop rotating within the target shutdown time, and the fan self-test shutdown passes. If the actual shutdown time required is greater than the preset target shutdown time, it indicates that the fan cannot completely stop rotating within the target shutdown time, and the fan self-test shutdown fails. By ensuring the fan self-test shutdown passes, the fan is guaranteed to be fully controllable. Responding to the shutdown command of the electric auxiliary heating element or boiler, the fan can stop rotating within the target shutdown time, preventing the fan from continuing to run after the electric auxiliary heating element or boiler is turned off, which would cause cold air to be blown out and affect the indoor temperature. This ensures the heating effect of the air conditioning system and improves the user experience. When the fan fails its self-test and stops, a fault message is issued, improving the fault diagnosis capability. Users can determine that the fan is in a faulty state through the fault message and can shut down the air conditioner in time, thus improving the safety of the air conditioning system.

[0099] It should be noted that those skilled in the art can set the target stop duration according to the actual situation, and the embodiments of this application do not limit the target stop duration.

[0100] Referring to Figure 6, which is a flowchart of a method for controlling a fan self-test shutdown with a target shutdown duration according to another embodiment of this application, the method includes, but is not limited to, steps S125 to S128. Specifically,

[0101] Step S125: Control the fan to enter emergency stop mode;

[0102] Step S126: After entering the emergency stop mode and waiting for the target stop time, obtain the actual speed of the fan;

[0103] Step S127: If the actual speed of the fan is zero, confirm that the fan self-test shutdown has passed;

[0104] Step S128: If the actual speed of the fan is not zero, the fan self-test stop is determined to be a failure.

[0105] In some embodiments of this application, after confirming that the self-test operation at all target speeds has passed, the fan is controlled to stop for a target stop duration. The fan self-test stop is then further assessed to determine if it has passed, and the fan is determined to be under control based on the self-test operation results and the fan self-test stop results. Controlling the fan self-test stop for the target stop duration includes: controlling the fan to enter an emergency stop mode; after the fan enters the emergency stop mode and the target stop duration has elapsed, obtaining the current actual speed of the fan, and determining whether the current actual speed is zero to determine if the fan has completely stopped. If the current actual speed is zero, the fan self-test stop is determined to have passed; if the current actual speed is not zero, the fan self-test stop is determined to have failed.

[0106] By acquiring the actual fan speed after the target stop time following the fan entering emergency stop mode, and determining whether the actual fan speed is zero after the target stop time, the self-test stop of the fan is determined. If the actual fan speed is zero, it indicates that the fan has completely stopped within the target stop time, and the self-test stop is successful. If the actual fan speed is not zero, it indicates that the fan has not completely stopped within the target stop time, and the self-test stop is unsuccessful. By confirming that the fan self-test stop is successful, the fan is ensured to be fully controllable. Responding to the stop commands from the electric auxiliary heating or the boiler, the fan can stop rotating within the target stop time, preventing the fan from continuing to run after the electric auxiliary heating components or the boiler have been shut down, thus avoiding the blowing of cold air and affecting the indoor temperature. This ensures the heating effect of the air conditioning system and improves the user experience. When the fan fails its self-test and stops, a fault message is issued, improving the fault diagnosis capability. Users can determine that the fan is in a faulty state through the fault message and can shut down the air conditioner in time. This avoids the electric auxiliary heating components or heater from burning dry when the fan fails or cannot reach the target speed. It also avoids safety problems caused by the ignition of flammable refrigerant leaking in the pipeline, thus improving the safety of the air conditioning system.

[0107] Referring to Figure 7, which is a flowchart of a method for controlling a fan to enter an emergency stop mode according to an embodiment of this application, controlling the fan to enter the emergency stop mode includes, but is not limited to, steps S410 to S420. Specifically,

[0108] Step S410: Control the fan operation by inputting a preset reverse current;

[0109] Step S420: Determine the target stop time based on the preset reverse current and the last target speed.

[0110] In some embodiments of this application, controlling the fan self-test shutdown based on a target shutdown duration includes two schemes. The first scheme involves controlling the fan to enter an emergency stop mode to start timing, and then ending timing when the fan stops, obtaining the actual shutdown duration. The actual shutdown duration is then compared with the target shutdown duration to determine whether the fan self-test shutdown has passed. The second scheme involves controlling the fan to enter an emergency stop mode. After entering the emergency stop mode and after the target shutdown duration, the actual fan speed is obtained, and it is determined whether the actual fan speed is zero to determine whether the fan self-test shutdown has passed. Therefore, regardless of whether the first or second scheme is used to control the fan self-test shutdown, it is necessary to first control the fan to enter an emergency stop mode and use the target shutdown duration as a benchmark. The target shutdown duration is determined as follows: by inputting a preset reverse current to control the fan's operation, the fan's rotation direction is changed, so that the fan's running direction is opposite to the running direction during the fan self-test operation, causing the fan speed to gradually decrease and eventually stop. It is understandable that the target shutdown time of the wind turbine is related to the magnitude of the last target speed during the wind turbine's self-test operation and the magnitude of the preset reverse current. When the magnitude of the last target speed during the wind turbine's self-test operation is large and the magnitude of the preset reverse current is small, the time required for the wind turbine's speed to drop to zero is longer, i.e., the target shutdown time is longer. When the magnitude of the last target speed during the wind turbine's self-test operation is small and the magnitude of the preset reverse current is large, the time required for the wind turbine's speed to drop to zero is shorter, i.e., the target shutdown time is shorter. In the embodiments of this application, the target shutdown time is determined based on the preset reverse current and the last target speed.

[0111] The target shutdown duration is determined based on the preset reverse current and the last target speed during the fan's self-test operation. After determining the target shutdown duration, when controlling the fan to self-test shut down, the actual shutdown duration of the fan is compared with the target shutdown duration to determine whether the fan self-test shutdown has passed. Furthermore, after the fan enters emergency stop mode and the target shutdown duration has elapsed, the actual fan speed is obtained, and it is determined whether the actual fan speed is zero to confirm whether the fan self-test shutdown has passed. By confirming that the fan self-test shutdown has passed, the fan is ensured to be fully controllable. Responding to shutdown commands from the electric auxiliary heating system or the boiler, the fan can stop rotating within the target shutdown duration, preventing the fan from continuing to run after the electric auxiliary heating components or the boiler have been shut down, which would cause cold air to be blown out and affect the indoor temperature. This ensures the heating effect of the air conditioning system and improves the user experience.

[0112] The starting control method of the electric auxiliary heating component or furnace of this application will be described in detail below through a specific example.

[0113] Referring to Figure 8, which is a flowchart of a start-up control method for an electric auxiliary heating component or a heater provided in another embodiment of this application, the start-up control method for the heating function includes: first, determining whether it is necessary to start the electric auxiliary heating component or the heater; when it is necessary to start the electric auxiliary heating component or the heater, in response to the electric auxiliary heating start command or the heater start command, the control of the fan is divided into three stages. Referring to Figure 9, which is a sequence diagram of the operation of a fan, an electric auxiliary heating component, or a heater provided in an embodiment of this application, the horizontal axis of the sequence diagram of the operation of the fan, the electric auxiliary heating component, or the heater is time, and the control of the fan includes the following three stages: controlling the fan to self-test, controlling the fan to self-test and stop at a target stop time, and starting the electric auxiliary heating component according to the electric auxiliary heating start command or starting the heater according to the heater start command.

[0114] Phase 1: Control the fan's self-test operation:

[0115] The fan is controlled to run at multiple target speeds for self-testing. The sequence of these target speeds during self-testing is determined, and the fan is controlled to rotate according to the corresponding target speeds. The system monitors whether the actual fan speed reaches all target speeds. If all target speeds are reached, the self-test is considered successful. By controlling the fan's self-testing, the system ensures the fan is in normal and controllable condition, and that the fan speed meets the target speed requirements of the electric auxiliary heating or boiler functions. This prevents dry burning of the electric auxiliary heating components or boiler in case of fan failure or failure to reach the target speed. It also avoids safety issues caused by dry burning of the electric auxiliary heating components or boiler if there was a previous leak of flammable refrigerant in the pipeline.

[0116] Understandably, monitoring whether the actual fan speed can reach the target speed includes obtaining the actual fan speed and determining the currently used i-th target speed, where i is a positive integer. If the actual fan speed reaches the i-th target speed within the second time period, it is determined that the fan has passed the self-test operation of the i-th target speed, and then the fan is controlled to rotate at the (i+1)-th target speed. If the actual fan speed cannot reach the i-th target speed within the second time period, the fan's self-test operation is stopped and a fault prompt is issued, improving fault diagnosis capabilities. Users can determine that the fan is in a faulty state through the fault prompt and can shut off the air conditioner in time. This avoids the electric auxiliary heating components or heaters from burning dry when the fan is faulty or cannot reach the target speed, and also avoids safety problems caused by the ignition of flammable refrigerant leaking in the pipes, thus improving the safety of the air conditioning system.

[0117] The target speeds are arranged from highest to lowest according to their usage sequence, or the last target speed in the usage sequence is the lowest operating speed of the fan. It is understood that, in order to save energy consumption in the air conditioning system, the embodiments of this application arrange the target speeds during fan self-test operation from highest to lowest according to their usage sequence. This results in a lower speed for the last target speed during the fan self-test operation, thus reducing the energy consumption required for the fan to enter the self-test shutdown phase controlled by the target shutdown duration, and also shortening the time required for the fan self-test shutdown. This improves the efficiency of the fan self-test shutdown, accelerates the entry of the electric auxiliary heating components or heater into normal operating heating state, and thus speeds up the heating response of the air conditioning system. Alternatively, the last target speed in the sequence can be used as the minimum operating speed of the fan, i.e., the rated minimum speed of the fan. After the fan completes the self-test operation at the last target speed and confirms that the self-test operation at all target speeds has passed, when it enters the self-test shutdown stage controlled by the target shutdown duration, the energy consumption required for the fan self-test shutdown can be reduced, thereby saving energy consumption of the air conditioning system. At the same time, the time required for the fan self-test shutdown is also shortened, improving the efficiency of the fan self-test shutdown and speeding up the entry of the electric auxiliary heating components or heater into the normal working heating state, thereby speeding up the heating response of the air conditioning system.

[0118] The fan is controlled to run at multiple different target speeds for self-testing. After passing the self-test at all target speeds, it enters stage 2.

[0119] Phase 2: Controlling the fan self-check shutdown based on the target shutdown duration:

[0120] The control fan self-test shutdown is used to verify that the fan can completely stop rotating within the target shutdown time, ensuring that the fan is fully under control.

[0121] The embodiments of this application provide two schemes to control the fan self-test shutdown based on the target shutdown duration.

[0122] Option 1: Control the fan to enter emergency stop mode;

[0123] After entering emergency stop mode, the actual speed of the fan is obtained after the target stop time.

[0124] If the actual speed of the fan is zero, the fan self-test shutdown is confirmed to have passed.

[0125] If the actual speed of the fan is not zero, the fan self-test shutdown test is confirmed to have failed.

[0126] Option 2: Control the fan to enter emergency stop mode and start timing;

[0127] The timing ends when the fan stops, thus obtaining the actual downtime.

[0128] If the actual downtime is less than or equal to the target downtime, the fan self-test shutdown is considered passed.

[0129] If the actual downtime exceeds the target downtime, the fan self-test shutdown fails.

[0130] The success of the fan self-test shutdown is determined by comparing the actual shutdown time required for the fan to enter emergency stop mode with the target shutdown time. Alternatively, the fan can be controlled to enter emergency stop mode, and after entering emergency stop mode and the target shutdown time has elapsed, the actual fan speed is obtained. The success of the fan self-test shutdown is then determined by checking if the actual fan speed is zero. By confirming that the fan self-test shutdown has passed, it is ensured that the fan is fully controllable. In response to the shutdown command of the electric auxiliary heating components or boiler, the fan can stop rotating within the target shutdown time. This prevents the fan from continuing to run after the electric auxiliary heating components or boiler have been shut down, which would cause cold air to be blown out and affect the indoor temperature. This ensures the heating effect of the air conditioning system and improves the user experience.

[0131] When the fan fails its self-test and stops, a fault message is issued, improving the fault diagnosis capability. Users can determine that the fan is in a faulty state through the fault message and can shut down the air conditioner in time. This avoids the electric auxiliary heating components or heater from burning dry when the fan fails or cannot reach the target speed. It also avoids safety problems caused by the ignition of flammable refrigerant leaking in the pipeline, thus improving the safety of the air conditioning system.

[0132] When both the fan self-test operation and the fan self-test shutdown pass, proceed to stage 3.

[0133] Phase 3: After the control fan has been running normally for the first time, start the electric auxiliary heating component according to the electric auxiliary heating start command or start the furnace according to the furnace start command.

[0134] After the fan passes its self-test operation and self-test shutdown, the fan is controlled to start normally. After the fan has been running normally for the first time, the electric auxiliary heating component is activated according to the electric auxiliary heating start command. The electric auxiliary heating component generates heat during the heating process, which raises the temperature of the air around the component. The fan blows out the heated air, which can quickly raise the indoor temperature and meet the heating demand of the air conditioning system. Alternatively, the furnace is activated according to the furnace start command. The furnace generates heat during the combustion process, which raises the temperature of the air around the furnace. The fan blows out the heated air, which can quickly raise the indoor temperature and meet the heating demand of the air conditioning system.

[0135] Embodiments of this application also provide a controller, including at least one processor and a memory for communicatively connecting to the at least one processor; the memory stores instructions executable by the at least one processor, which, when executed by the at least one processor, enable the at least one processor to perform a start-up control method for a heat dissipation function as described in the above embodiments.

[0136] Embodiments of this application also provide an air conditioning system, including the heating component, fan, and controller described in the above embodiments.

[0137] As shown in Figure 10, Figure 10 is a schematic diagram of a controller 1000 provided in one embodiment of this application.

[0138] The controller 1000 of the embodiments of this application includes one or more processors 1001 and memory 1002. FIG10 uses one processor 1001 and one memory 1002 as an example.

[0139] The processor 1001 and the memory 1002 can be connected via a bus or other means. Figure 10 shows an example of connection via a bus.

[0140] Memory 1002, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory 1002 may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory 1002 may optionally include memory 1002 remotely located relative to processor 1001, and these remote memories can be connected to controller 1000 via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0141] Those skilled in the art will understand that the device structure shown in FIG10 does not constitute a limitation on the controller 1000, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0142] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0143] The non-transient software program and instructions required to implement the lighting control method of the above embodiments are stored in memory and executed by the processor, thus executing the above embodiments.

[0144] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network nodes. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0145] Furthermore, one embodiment of this application provides a computer-readable storage medium storing computer-executable instructions that are executed by a processor or controller 1000.

[0146] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0147] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0148] In the several embodiments provided in this application, it should be understood that the disclosed systems, instruments, and methods can be implemented in other ways. For example, the instrument embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between instruments or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0149] It should also be understood that the various implementation methods provided in the embodiments of this application can be combined arbitrarily to achieve different technical effects.

[0150] The above is a detailed description of the preferred embodiments of this application. However, this application is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A method for starting a heating function, applied to a combustible refrigerant air conditioning system, wherein the combustible refrigerant air conditioning system includes a heating element and a fan; the starting control method includes: In response to the command to activate the heating function, the fan is controlled to perform self-test operation and self-test shutdown. After the fan has passed its self-test operation and self-test shutdown, the fan is controlled to start and run normally. as well as After the fan has been running normally for a first period of time, the heating component is activated according to the heating function activation command.

2. The method according to claim 1, wherein, The control of the fan's self-test operation and self-test shutdown includes: The fan is controlled to perform self-test operation using multiple target speeds; After passing the self-test at all the target speeds, the fan self-tests and stops at the target stop duration; and After the self-test of the shutdown period based on the target shutdown duration passes, the fan is controlled to start and run normally.

3. The method according to claim 2, wherein, The method of controlling the self-test operation of the fan with multiple target speeds includes: Determine the order in which the target rotational speed is used during self-test operation; and The target speed is set sequentially according to the usage order, the fan is controlled to rotate according to the currently used target speed, and it is determined whether the actual speed of the fan can reach the currently used target speed.

4. The method according to claim 3, wherein, Determining whether the actual rotational speed of the fan can reach the currently used target rotational speed includes: Obtain the actual rotational speed of the fan and determine the i-th target rotational speed currently in use, where i is a positive integer; If the actual rotational speed of the fan reaches the i-th target rotational speed within the second time period, it is determined that the fan has passed the self-test operation at the i-th target rotational speed, and then the fan rotation is controlled at the (i+1)-th target rotational speed; and If the actual speed of the fan cannot reach the i-th target speed within the second time period, the self-test operation of the fan will be stopped and a fault prompt will be issued.

5. The method according to claim 3 or 4, wherein, The target rotational speeds are arranged from largest to smallest according to the order of use, or the last target rotational speed in the order of use is the lowest operating speed of the fan.

6. The method according to any one of claims 2 to 5, wherein, The method of controlling the fan self-test shutdown based on the target shutdown duration includes: Control the fan to enter emergency stop mode and start timing; The timing ends when the fan stops, and the actual downtime is obtained. If the actual downtime is less than or equal to the target downtime, the fan self-test shutdown is deemed to have passed; and If the actual shutdown time is longer than the target shutdown time, the fan self-test shutdown is determined to be a failure.

7. The method according to any one of claims 2 to 6, wherein, The method of controlling the fan self-test shutdown based on the target shutdown duration includes: Control the fan to enter emergency stop mode; After entering the emergency stop mode and waiting for the target stop time, the actual rotational speed of the fan is obtained; If the actual speed of the fan is zero, the fan self-test shutdown is deemed to have passed; and If the actual rotational speed of the fan is not zero, the fan self-test shutdown is determined to be a failure.

8. The method according to claim 6 or 7, wherein, The control of the fan to enter the emergency stop mode includes: The fan operation is controlled by inputting a preset reverse current; and The target stop duration is determined based on the preset reverse current and the last target rotational speed.

9. A controller, comprising at least one processor and a memory for communicatively connecting to said at least one processor, wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the start-up control method for the heating function as described in any one of claims 1 to 8.

10. An air conditioning system, comprising a heating element, a fan, and a controller as claimed in claim 9.

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