Air conditioner and self-cleaning control method for air conditioner

Abstract

This disclosure discloses an air conditioner and a self-cleaning control method for the air conditioner, which includes a fan feedback device (138) configured to detect the real-time rotation speed of a fan (135) and a voltage collection circuit (139) configured to detect the input voltage of the fan (135), and upon receiving a self-cleaning control command, controls the fan (135) to rotate according to a set rotation speed, detects the real-time rotation speed of the fan (135), and if the detected real-time rotation speed is equal to the set rotation speed, obtains the pulse width and input voltage of a fan drive signal, matches the corresponding cleaning time according to the pulse width and input voltage, controls the fan (135) to stop operation, and controls a cleaning device (137) according to the cleaning time to complete cleaning.

Description

[Technical Field]

[0001] TECHNICAL FIELD This disclosure relates to the technical field of air conditioning, and in particular to an air conditioner and a method for controlling self-cleaning of an air conditioner.

[0002] This publication claims priority to Chinese Patent Application No. 2023114717184, filed on November 6, 2023, the entire contents of which are incorporated herein by reference. [Background technology]

[0003] The indoor unit of an air conditioner has an intake and an outlet, and a filter is installed at the intake to filter the air flowing into the housing and prevent foreign matter such as dust from entering the indoor unit of the air conditioner. If an excessive amount of foreign matter adheres to the filter after a certain period of use, some of the filter holes will become clogged, reducing the amount of air intake and affecting the cooling or heating efficiency of the air conditioner.

[0004] In related technology, air conditioners may be equipped with a cleaning device, and the cleaning device can be used to clean the filter. However, because the installation environment and frequency of use of air conditioners vary, the cleaning device may not be effective enough when cleaning the filter. Summary of the Invention [Problem to be solved by the invention]

[0005] Some embodiments of the present disclosure provide an air conditioner and a self-cleaning control method for the air conditioner for improving a situation in which the cleaning effect of the filter by the cleaning device is insufficient. [Means for solving the problem]

[0006] As a first aspect, some embodiments of the present disclosure provide an air conditioner, the air conditioner comprising: The indoor unit includes: a cover provided with an air inlet; an indoor heat exchanger provided inside the cover; a fan provided inside the cover, positioned away from the air inlet of the indoor heat exchanger, and configured to accelerate the flow rate of air passing through the indoor heat exchanger during rotation; a filter provided inside the cover, positioned between the indoor heat exchanger and the air inlet, and configured to filter air passing through the indoor heat exchanger; a cleaning device disposed within the cover and configured to clean the filter upon receiving a cleaning command; a fan drive circuit configured to drive the fan in rotation upon receiving a fan drive signal; a fan feedback device configured to detect a real-time rotation speed of the fan; a voltage acquisition circuit configured to detect an input voltage of the fan; When receiving a self-cleaning control command, output a fan drive signal according to a set rotation speed to rotate the fan, and obtain a real-time rotation speed of the fan detected by the fan feedback device; If the detected real-time rotation speed is equal to the set rotation speed, the pulse width of the fan drive signal and the input voltage detected by the voltage acquisition circuit are acquired; Matching a corresponding cleaning time from a preset cleaning time matching table according to the pulse width and the input voltage; a controller configured to stop output of the fan drive signal to the fan drive circuit to control the fan to stop operation, and to output a cleaning command in accordance with the cleaning time to control the cleaning device to complete cleaning of the filter; Includes.

[0007] In the disclosed embodiment, the thickness of dust accumulation on the filter is likely to vary depending on the installation environment and frequency of use of the air conditioner. Dust adhering to the filter can affect the airflow of the indoor unit, resulting in significant resistance during the fan's actual rotation. Therefore, even if the controller controls the fan to rotate at an initially set rotation speed, the fan may encounter significant resistance during its actual rotation, preventing it from reaching the set rotation speed. In this embodiment, detecting the fan's real-time rotation speed allows the actual resistance experienced by the fan to be determined, thereby determining the thickness of dust adhering to the filter. In other words, detecting the fan's real-time rotation speed enables the detection of the dust thickness on the filter. In this way, when a subsequent cleaning command is executed, a cleaning time matching the dust thickness is determined according to the thickness of dust adhering to the filter, and the cleaning device is controlled to clean the filter for that cleaning time, thereby improving cleaning effectiveness.

[0008] When the fan is rotating stably at a set speed, the required cleaning time can be determined based on the input voltage and fan drive signal pulse width corresponding to the fan speed, allowing the filter dust accumulation thickness to be identified and different cleaning times to be performed. This improves filter cleaning effectiveness and solves the problem of cleaning times being too short or too long due to undetected filter dust thickness, enabling more accurate control of cleaning time. Compared to cleaning processes based on a fixed program set by the control program, this reduces unnecessary cleaning time while maintaining cleaning effectiveness, thereby saving energy, extending the life of the cleaning device, and improving reliability. Furthermore, reducing unnecessary cleaning time also reduces the impact of unnecessary cleaning processes on the customer's normal use of the air conditioner.

[0009] In a second aspect, an embodiment of the present disclosure further provides a self-cleaning control method for an air conditioner, the air conditioner comprising:

[0010] The indoor unit includes: a cover provided with an air inlet; an indoor heat exchanger provided inside the cover; a fan provided inside the cover, positioned away from the air inlet of the indoor heat exchanger, and configured to accelerate the flow rate of air passing through the indoor heat exchanger during rotation; a filter provided inside the cover, positioned between the indoor heat exchanger and the air inlet, and configured to filter air passing through the indoor heat exchanger; a cleaning device disposed within the cover and configured to clean the filter upon receiving a cleaning command; a fan drive circuit configured to drive the fan in rotation upon receiving a fan drive signal; a fan feedback device configured to detect a real-time rotation speed of the fan; a voltage acquisition circuit configured to detect an input voltage of the fan; The self-cleaning control method includes: When receiving a self-cleaning control command, outputting a fan drive signal according to a set rotation speed to rotate the fan, and obtaining a real-time rotation speed of the fan detected by the fan feedback device; If the detected real-time rotation speed is equal to the set rotation speed, acquiring the pulse width of the fan driving signal and the input voltage detected by the voltage acquisition circuit; Matching a corresponding cleaning time from a preset cleaning time matching table according to the pulse width and the input voltage; The method includes a step of stopping the output of the fan drive signal to the fan drive circuit to control the fan to stop operation, and outputting a cleaning command in accordance with the cleaning time to control the cleaning device to complete cleaning of the filter. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a structural schematic diagram of an embodiment of an air conditioner according to an embodiment of the present disclosure. [Figure 2]1 is a schematic diagram of a partial structure of a cooling circuit of an air conditioner in an embodiment of the present disclosure. [Figure 3] FIG. 2 is another structural schematic diagram of an air conditioner according to an embodiment of the present disclosure. [Figure 4] 1 is a structural schematic diagram of an indoor unit according to an embodiment of the present disclosure. [Figure 5] FIG. 2 is a flow diagram of steps performed by an air conditioner according to an embodiment of the present disclosure. [Figure 6a] 10 is a schematic diagram illustrating the relationship between the dust thickness and the pulse width of the fan drive signal when the voltage value of the DC voltage is constant according to an embodiment of the present disclosure. [Figure 6b] 10 is a schematic diagram illustrating the relationship between dust thickness and DC voltage value when the pulse width of the fan drive signal is constant according to an embodiment of the present disclosure. [Figure 7] FIG. 10 is a flow diagram of other steps performed by an air conditioner according to an embodiment of the present disclosure. [Figure 8] 1 is a schematic diagram of a partial structure of an air conditioner according to an embodiment of the present disclosure. [Figure 9] 1 is a structural schematic diagram of a filter and a cleaning device according to an embodiment of the present disclosure. [Figure 10] 1 is a schematic flow diagram of a self-cleaning control method for an air conditioner according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, the technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only some embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments that can be obtained by those skilled in the art without creative work also fall within the scope of protection of the present disclosure.

[0013] In the description of this disclosure, orientations or positional relationships indicated by terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are based on the orientations or positional relationships shown in the drawings, and are intended to facilitate and simplify the description of this disclosure, and do not suggest or imply that the device or component has a specific orientation or must be configured or operate in a specific orientation, and therefore should not be construed as limiting this disclosure.

[0014] Terms such as "first," "second," etc. are used for convenience of description and do not indicate or imply the relative importance or number of technical features shown. Thus, a feature qualified by "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this disclosure, unless otherwise specified, "plurality" means two or more.

[0015] In the description of this disclosure, unless otherwise clearly specified or limited, the terms "attach," "couple," "connect," etc. should be interpreted broadly, and may mean, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, or communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to specific circumstances.

[0016] As shown in FIG. 1, an embodiment of the present disclosure provides an air conditioner 100, which may include an indoor unit 110. The indoor unit 110 may be installed indoors and may be an indoor wall-mounted type, an indoor freestanding type, or the like.

[0017] In some embodiments, as shown in FIG. 1, the air conditioner 100 may include an outdoor unit 120, which may be located outdoors and configured to exchange heat with an indoor environment.

[0018] In some embodiments, as shown in FIG. 1, the air conditioner 100 may include a refrigerant circuit 130, and circulating a refrigerant within the refrigerant circuit 130 may implement a vapor compression refrigerant cycle.

[0019] In some embodiments, connecting pipes are connected to the indoor unit 110 and the outdoor unit 120 to form a refrigerant circuit 130 for circulating the refrigerant.

[0020] In some embodiments, as shown in FIG. 2, the refrigerant circuit 130 may include a compressor 131, which may be provided in the outdoor unit 120 and serves to drive the compression of the refrigerant in the refrigerant circuit 130.

[0021] In some embodiments, as shown in FIG. 2, the refrigerant circuit 130 may include an indoor heat exchanger 132, which may be provided within the indoor unit 110.

[0022] In some embodiments, as shown in FIG. 2, the refrigerant circuit 130 may include an expansion valve 133, which may be provided in the indoor unit 110 or the outdoor unit 120, but is not limited to these, and may also be provided in the connecting pipe between the indoor unit 110 and the outdoor unit 120.

[0023] In some embodiments, as shown in FIG. 2, the refrigerant circuit 130 may include an outdoor heat exchanger 134, which may be provided within the outdoor unit 120.

[0024] In some embodiments, one of the indoor heat exchanger 132 and the outdoor heat exchanger 134 functions as a condenser, and the other functions as an evaporator. When the indoor heat exchanger 132 functions as a condenser and the outdoor heat exchanger 134 functions as an evaporator, the air conditioner 100 functions as a heater in a heating mode, and when the indoor heat exchanger 132 functions as an evaporator and the outdoor heat exchanger 134 functions as a condenser, the air conditioner 100 functions as a cooler in a cooling mode.

[0025] In some embodiments, the compressor 131 may compress a high-temperature, high-pressure refrigerant gas and discharge the compressed refrigerant gas. The refrigerant gas discharged from the compressor 131 may flow into the condenser. The condenser condenses the compressed refrigerant into a liquid phase and releases heat to the surrounding environment through the condensation process. The expansion valve 133 may expand the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator may evaporate the expanded refrigerant through the expansion valve 133 and return the low-temperature, low-pressure refrigerant gas to the compressor 131. The evaporator may achieve a cooling effect by exchanging heat with an object to be cooled using the latent heat of evaporation of the refrigerant. Through the entire cycle, the air conditioner 100 may adjust the temperature of the indoor space.

[0026] In some embodiments, the air conditioner 100 uses a compressor 131, an indoor heat exchanger 132, an expansion valve 133, and an outdoor heat exchanger 134 to implement the air conditioner's refrigerant cycle. The refrigerant cycle includes a series of processes: compression, condensation, expansion, and evaporation, to supply refrigerant to conditioned and heat-exchanged air.

[0027] 3, in some embodiments, the air conditioner 100 may include an indoor unit 110, and the indoor unit 110 is provided with an indoor heat exchanger 132. The indoor heat exchanger 132 is configured to function as an evaporator and supply cool air to the room when the air conditioner 100 is in a cooling mode, and to function as a condenser and supply heat to the room when the air conditioner 100 is in a heating mode.

[0028] 3, in some embodiments, the air conditioner 100 may include a fan 135, which may be provided inside the indoor unit 110. The fan 135 is configured to accelerate the flow velocity of air passing through the indoor heat exchanger 132.

[0029] In some embodiments, the fan 135 is configured to accelerate the flow rate of air passing through the indoor heat exchanger 132 during the rotation process, thereby increasing the rate at which the indoor heat exchanger 132 transfers heat / cold energy.

[0030] In some embodiments, referring to FIG. 3 , the air conditioner 100 may include a filter 136, which may be provided inside the indoor unit 110 and configured to filter air passing through the indoor heat exchanger 132.

[0031] In some embodiments, the air conditioner 100 may include a filter 136, which may be provided at the air inlet of the indoor unit 110 and is configured to filter the air passing through the indoor heat exchanger 132, thereby reducing the adhesion of dust in the air to the indoor heat exchanger 132 and ensuring that the indoor heat exchanger 132 operates normally.

[0032] In some embodiments, referring to FIG. 3, the air conditioner 100 may include a cleaning device 137, which may be provided inside the indoor unit 110 and configured to clean the filter 136.

[0033] In some embodiments, the cleaning device 137 is configured to clean the filter 136 upon receiving a cleaning command, thereby removing a large amount of dust filtered onto the filter 136, and improving a situation in which the dust adhering to the filter 136 becomes too thick, affecting the air blowing of the indoor unit 110 and hindering the normal operation of the air conditioner 100.

[0034] 4 , in some embodiments, the indoor unit 110 may include a cover 143, an indoor heat exchanger 132, a fan 135, a filter 136, and a cleaning device 137. The indoor heat exchanger 132, the fan 135, the filter 136, and the cleaning device 137 may all be provided inside the cover 143.

[0035] In some embodiments, referring to FIG. 4, the cover 143 is provided with an air inlet 144, the fan 135 is located on the side of the indoor heat exchanger 132 away from the air inlet 135, and the filter 136 is located between the indoor heat exchanger 132 and the air inlet.

[0036] In some embodiments, referring to FIG. 4, the cover 143 is further provided with an air outlet 146, which is located on the side away from the air inlet 144 of the fan 135.

[0037] In this embodiment, during the rotation of the fan 135, outside air enters the cover 143 through the air inlet 144, passes through the filter 136 and the indoor heat exchanger 132 in order, and is then discharged into the room through the air outlet 146.

[0038] 4, in some embodiments, an air inlet 144 is designed on the top of a cover 143 of the indoor unit 110, and a filter 136 is attached to the bottom of the air inlet 144 and between the air inlet 144 and the indoor heat exchanger 132. The filter 136 is configured to filter the air blown in from the air inlet 144, and the cleaning device 137 is designed to fit closely to the filter 136 and is configured to clean dust on the filter 136.

[0039] In some embodiments, referring to FIG. 4, a fan 135 designed inside the indoor unit 110 is configured to rotate and drive a fan wheel 145, and the rotation of the fan wheel 145 accelerates the air flow inside the indoor unit 110, and air outside the indoor unit 110 is blown in from above, filtered by a filter 136, and heat exchanged by an indoor heat exchanger 132, and the cool air / warm air after heat exchange is discharged into the room from an air outlet 146 designed at the bottom of a cover 143.

[0040] In some embodiments, the air conditioner 100 may include a fan drive circuit 140 configured to output a drive voltage to drive the fan 135 to rotate.

[0041] In some embodiments, the air conditioner 100 may include a fan drive circuit 140 configured to drive the fan 135 to rotate upon receiving a fan drive signal.

[0042] In some embodiments, the air conditioner 100 may include a fan drive circuit 140, which, upon receiving a fan drive signal, converts the fan drive signal into a drive voltage signal and outputs the drive voltage signal to the fan 135 to drive the fan 135 to rotate.

[0043] In some embodiments, the air conditioner 100 may include a fan drive circuit 140, which is controlled by a controller 141 and outputs a corresponding drive signal to the fan 135 in response to a control signal output by the controller 141, thereby driving the fan 135 to rotate.

[0044] In some embodiments, the fan drive circuit 140 may also be provided inside the indoor unit 110 , that is, the fan drive circuit 140 is located within a cover 143 of the indoor unit 110 .

[0045] In some embodiments, the indoor unit 110 may include a fan drive circuit 140 , which is located within a cover 143 of the indoor unit 110 .

[0046] In some embodiments, the air conditioner 100 may include a fan feedback device 138 configured to detect the real-time rotation speed of the fan 135 .

[0047] In some embodiments, when the fan drive circuit 140 outputs the corresponding drive signal to drive the fan 135, there may be too much dust adhering to the filter 136, forming a thick dust layer that affects the airflow of the indoor unit 110, resulting in a large resistance to the fan 135 during actual rotation. In this case, even when driven by the drive signal, the fan 135 may not reach the corresponding rotation speed. Therefore, after the fan drive circuit 140 outputs the corresponding drive signal to drive the fan 135, the air conditioner 100 must also use the fan feedback device 138 to detect the rotation speed of the fan 135 and feed the real-time rotation speed back to the controller 141.

[0048] In some embodiments, the fan feedback device 138 may also be provided inside the indoor unit 110 , that is, the fan feedback device 138 is located within the cover 143 of the indoor unit 110 .

[0049] In some embodiments, the indoor unit 110 may include a fan feedback device 138 , which is located within a cover 143 of the indoor unit 110 .

[0050] In some embodiments, the air conditioner 100 may include a voltage acquisition circuit 139 configured to detect the input voltage of the fan.

[0051] In some embodiments, the air conditioner 100 may include a voltage acquisition circuit 139 configured to detect a voltage value of a DC voltage. This DC voltage value is a voltage value obtained by rectifying an AC voltage input to an AC power terminal of the air conditioner 100, and this DC voltage can be output to the fan 135, i.e., this DC voltage can be the input voltage of the fan 135.

[0052] In some embodiments, the voltage collection circuit 139 may also be provided inside the indoor unit 110 , that is, the voltage collection circuit 139 is located within a cover 143 of the indoor unit 110 .

[0053] In some embodiments, the indoor unit 110 may include a voltage collection circuit 139 located within a cover 143 of the indoor unit 110 .

[0054] In some embodiments, referring to FIG. 4, the indoor unit 110 may be in a wall-mounted form, and the indoor unit 110 is hung on the wall of the facility via a base 142.

[0055] In some embodiments, the air conditioner 100 further includes a, which is configured to control and rotate the fan at a set rotation speed when receiving a self-cleaning control command, and detect the real-time rotation speed of the fan.

[0056] In some embodiments, upon receiving a self-cleaning control command, the fan 135 is configured to output a fan drive signal according to a set rotation speed to drive the fan 135 to rotate, and obtain the real-time rotation speed of the fan 135 detected by the fan feedback device 138.

[0057] In some embodiments, upon receiving the self-cleaning control command, the fan drive circuit 140 may output a fan drive signal according to a set rotation speed, and the fan drive circuit 140 may drive the fan 135 to rotate according to the fan drive signal. The fan feedback device 138 may also acquire the real-time rotation speed of the fan 135 detected by the fan feedback device 138.

[0058] Here, dust adhering to the filter 136 may affect the airflow of the indoor unit 110, and as a result, the fan 135 may encounter significant resistance during actual rotation. Therefore, even if the fan 135 is controlled to rotate at an initially set rotation speed, the fan 135 may encounter significant resistance during its actual rotation, potentially preventing the fan 135 from reaching the set rotation speed. In some embodiments of the present disclosure, the resistance actually experienced by the fan 135 can be determined by detecting the real-time rotation speed of the fan 135, thereby determining the thickness of dust adhering to the filter 136. That is, detecting the real-time rotation speed of the fan 135 makes it possible to detect the thickness of dust on the filter 136. In this way, when a subsequent cleaning command is executed, a cleaning time that matches the dust thickness is determined according to the thickness of dust adhering to the filter 136, and the cleaning device 137 is controlled to clean the filter for that cleaning time, thereby improving the cleaning effect.

[0059] Here, the cleaning time is proportional to the dust thickness, so the thicker the dust thickness, the longer the necessary cleaning time, and the thinner the dust thickness, the shorter the necessary cleaning time.

[0060] In some embodiments, when receiving a self-cleaning control command, the step of obtaining the real-time rotation speed of the fan 135 detected by the fan feedback device 138 may be performed after the step of outputting a fan driving signal according to the set rotation speed to drive the fan 135, but is not limited to this, and may also be performed simultaneously, and is determined according to specific circumstances.

[0061] In some embodiments, the fan drive signal input voltage detection circuit is further configured to obtain a pulse width of the fan drive signal and a fan input voltage detected by the voltage detection circuit when the detected real-time rotation speed is equal to the set rotation speed.

[0062] In some embodiments, the power supply is further configured to match a corresponding cleaning time from a preset cleaning time matching table according to the pulse width and the input voltage.

[0063] In this embodiment, if the real-time rotation speed of the fan 135 detected by the fan feedback device 138 is equal to the set rotation speed, it indicates that the dust adhering to the filter 136 has almost no effect on the air blowing from the indoor unit 110, that is, the resistance that the fan 135 encounters when actually rotating is small, and basically has no effect on the rotation speed of the fan 135, so that the fan 135 can rotate at the set rotation speed.

[0064] Here, the rotation speed of the fan 135 is affected by two factors: the pulse width of the fan drive signal and the input voltage. This input voltage is a DC voltage detected by the voltage collection circuit 139, and this DC voltage can be output to the fan 135. When the fan 135 rotates at a fixed rotation speed (e.g., a set rotation speed), referring to FIG. 6A, under the condition that the input voltage (voltage value V of the DC voltage) is fixed, the pulse width T of the fan drive signal is proportional to the thickness of dust on the filter 136. The thicker the dust thickness on the filter 136, the greater the airflow resistance during operation of the air conditioner 100, which increases the pulse width T of the fan drive signal and the longer the cleaning time required for the filter 136. Referring to FIG. 6b, under the condition that the pulse width T of the fan drive signal is fixed, the input voltage (voltage value V of the DC voltage) is proportional to the dust thickness on the filter 136, and the thicker the dust thickness on the filter 136, the greater the airflow resistance during operation of the air conditioner 100, the greater the voltage value V of the DC voltage, and the longer the cleaning time required for the filter 136.

[0065] Based on this, if it is determined that the real-time rotation speed of the fan 135 detected by the fan feedback device 138 is equal to the set rotation speed, it indicates that the fan 135 is rotating at a constant rotation speed, and at this time, the pulse width of the fan driving signal and the input voltage detected by the voltage collection circuit are obtained, and then the cleaning time corresponding to the pulse width and input voltage of the fan driving signal can be searched through a preset cleaning time matching table.

[0066] Here, when the air conditioner cleans the filter according to a fixed program set in the control program, the corresponding cleaning time of the cleaning device 137 is the set fixed time, regardless of how thick the dust thickness on the filter 136 is. This set fixed time provides good cleaning effectiveness for dust that is less than a target thickness, but if the dust thickness on the filter 136 exceeds the target thickness, cleaning for the set fixed time creates a problem in that the cleaning effectiveness decreases. If the dust thickness on the filter 136 is less than the target thickness, good cleaning effectiveness is achieved before the set fixed time is reached, but the cleaning device 137 continues cleaning the filter 136 to complete the fixed time cleaning, resulting in wasted time and power consumption.

[0067] On the other hand, in some embodiments of the present disclosure, when the fan 135 is rotating stably at a constant speed, the required cleaning time can be determined according to the input voltage and the pulse width of the fan drive signal, and the dust thickness on the filter 136 can be identified to perform different cleaning time operations, thereby improving the cleaning effect of the filter 136. Furthermore, this effectively resolves the problem of cleaning time being too short or too long due to undetected dust thickness on the filter 136, thereby enabling more accurate control of the cleaning time. Compared to cleaning methods using a fixed program set by a control program, this method can reduce unnecessary cleaning time while maintaining cleaning effectiveness, thereby saving power consumption, extending the life of the cleaning device, and improving reliability. Furthermore, reducing unnecessary cleaning time also reduces the impact of unnecessary cleaning processes on the customer's normal use of the air conditioner.

[0068] In some embodiments, the pre-set cleaning time matching table is obtained through prior mass testing and pre-stored in the memory for later recall.

[0069] In some embodiments, a three-dimensional array can be created through testing based on the fact that the fan rotation speed is affected by two factors: the pulse width of the fan drive signal and the input voltage. For a constant input voltage, the pulse width of the fan drive signal is proportional to the dust thickness on the filter. The thicker the dust thickness on the filter, the greater the airflow resistance during operation of the air conditioner, which in turn increases the pulse width of the fan drive signal and the longer the cleaning time required for the filter. Therefore, by testing with different input voltages, the correspondence between the pulse width of the fan drive signal and the cleaning time under different filter dust thicknesses can be obtained. A three-dimensional array can be created for the input voltage, the pulse width of the fan drive signal, and the cleaning time. The parameter relationships between the cleaning time, the pulse width of the fan drive signal, and the input voltage are fixed, forming a preset cleaning time matching table.

[0070] In some embodiments, the control unit 110 is further configured to stop outputting the fan drive signal to the fan drive circuit 140 to control the fan 135 to stop operation, and to output a cleaning command according to the cleaning time to control the cleaning device 137 to complete cleaning of the filter 136.

[0071] In some embodiments, the cleaning device 137 is further configured to output a cleaning command according to the cleaning time, and the cleaning command acts on the cleaning device 137 so that the cleaning device 137 can complete cleaning of the filter 136 according to the cleaning command.

[0072] In some embodiments, by controlling the fan 135 to stop operating while the cleaning device 137 is cleaning the filter 136, it is possible to reduce the dust that falls when the cleaning device 137 cleans the filter 136 from being dispersed into the atmosphere by the fan 135.

[0073] In some embodiments, a cleaning command corresponding to the cleaning device 137 is output according to the cleaning time, and the cleaning device 137 is controlled to complete cleaning of the filter 136, after which the self-cleaning mode can be terminated, and at this time the self-cleaning mode of the air conditioner is completed.

[0074] 5, in some embodiments, upon receiving a preset self-cleaning control command, the controller 100 may execute step S501 in response to the self-cleaning control command to control the fan to rotate at a preset rotation speed v1, i.e., control the fan drive circuit to output a drive signal at the preset rotation speed, thereby controlling the fan to rotate.

[0075] 5, in some embodiments, upon receiving a preset self-cleaning control command, the controller 100 may perform step S502 in response to the self-cleaning control command to detect the real-time rotation speed v of the fan, i.e., detect the real-time rotation speed v of the fan through a fan feedback device.

[0076] In some embodiments, referring to FIG. 5, step S502 may be performed after step S501, but is not limited thereto, and step S502 and step S501 may be performed simultaneously, which is determined according to specific circumstances.

[0077] In some embodiments, referring to FIG. 5, after performing step S501 and step S502, step S503 may be further performed to determine whether the real-time rotation speed vt is equal to the set rotation speed v1.

[0078] In some embodiments, referring to FIG. 5, if the determination in step S503 is negative, step S509 may be performed to execute other control flows.

[0079] 5, in some embodiments, if the determination in step S503 is YES, the may perform step S504 to obtain a pulse width T of the fan drive signal. The pulse width T of the fan drive signal refers to the pulse width of the drive signal output by the to the fan drive circuit.

[0080] 5 , in some embodiments, if the determination in step S503 is YES, step S505 may be further executed to acquire the voltage value V of the DC voltage. That is, the voltage collection circuit detects the voltage value V of the DC voltage obtained by rectifying the AC voltage input to the AC power supply terminal of the air conditioner, and this voltage value V of the DC voltage can be input to the fan 135. That is, the voltage value V of the DC voltage can act as the input voltage of the fan 135.

[0081] In some embodiments, step S504 and step S505 may be performed simultaneously, but are not limited to this and may be performed asynchronously. For example, step S504 may be performed first and then step S505, or step S505 may be performed first and then step S504.

[0082] 5, in some embodiments, after performing steps S504 and S505, step S506 may be further performed to match a corresponding cleaning time P. That is, the corresponding cleaning time is matched from a preset cleaning time matching table according to the pulse width T and the voltage value V of the DC voltage.

[0083] 5, after executing step S506, may further execute step S507 to control the fan 135 to stop operating. That is, may stop outputting the fan drive signal to the fan drive circuit 140 and control the fan 135 to stop operating.

[0084] In some embodiments, referring to FIG. 5, after performing step S506, step S508 may be further performed to control the cleaning device according to the cleaning time P to complete the cleaning.

[0085] In some embodiments, step S507 may be performed before step S508, but is not limited thereto, and step S507 and step S508 may be performed simultaneously.

[0086] In some embodiments, the voltage value V of the DC voltage (i.e., the input voltage of the fan) is fixed, and the pulse width of the fan drive signal is tested when the fan is driven at a set rotation speed with different dust thicknesses on the filter, resulting in relationship a shown in Figure 6. The pulse width of the fan drive signal is fixed, and the voltage value V of the DC voltage required for the fan is tested when the fan is driven at a set rotation speed with different dust thicknesses on the filter, resulting in relationship b shown in Figure 6. When the voltage value V of the DC voltage is constant, the pulse width of the fan drive signal is proportional to the dust thickness on the filter. The thicker the dust thickness on the filter, the greater the airflow resistance during operation of the air conditioner, which increases the required pulse width T of the fan drive signal and the longer the cleaning time required for the filter. Therefore, by testing the correspondence between the pulse width of the fan drive signal and the cleaning time T under different filter dust thicknesses at different DC voltage values ​​V, and creating a cleaning time matching table with a VTP three-dimensional array of correspondences, the relationship between the cleaning time P and the parameters of the drive signal pulse width T and drive signal voltage value V can be fixed, so that the corresponding cleaning time P can be matched according to the pulse width and voltage value, and cleaning control can be performed.

[0087] In some embodiments, more accurate calculation of the self-cleaning time of the air conditioner filter can, on the one hand, reduce unnecessary energy consumption, and, on the other hand, reduce the impact of unnecessary cleaning processes on the user's normal use of the air conditioner. Finally, more accurate control of the self-cleaning time can reduce unnecessary operation time of the cleaning device, thereby extending the life of the cleaning device and improving its reliability. Implementation of this control method improves the customer experience and product reliability.

[0088] In some embodiments, the fan drive signal is further configured to adjust a pulse width of the fan drive signal when an error between the detected real-time rotation speed and the set rotation speed is not within a preset range.

[0089] In this embodiment, if the error between the detected real-time rotation speed and the set rotation speed is not within the set range, it indicates a large fluctuation in the rotation speed of the fan 135, which is unfavorable for performing subsequent operations, and therefore unfavorable for the air conditioner 100 to realize the self-cleaning operation of the filter 136. Therefore, to ensure smooth self-cleaning operation of the filter 136, if the error between the detected real-time rotation speed and the set rotation speed is not within the set range, the pulse width of the fan drive signal is adjusted. After adjusting the pulse width of the fan drive signal, the real-time rotation speed of the fan 135 needs to be detected again until the error between the detected real-time rotation speed and the set rotation speed is within the set range.

[0090] In some embodiments, the fan drive control unit is further configured to increase the pulse width of the fan drive signal by a first preset width value when the detected real-time rotation speed is lower than the set rotation speed.

[0091] In some embodiments, the fan drive signal generating unit is further configured to increase the pulse width of the fan drive signal by a predetermined first width value when the detected real-time rotation speed is lower than the set rotation speed and the error between the detected real-time rotation speed and the set rotation speed is not within a set range.

[0092] In some embodiments, the fan drive signal generating unit is further configured to reduce the pulse width of the fan drive signal by a second preset width value when the detected real-time rotation speed is higher than the set rotation speed.

[0093] In some embodiments, the fan drive signal generating unit is further configured to reduce the pulse width of the fan drive signal by a second preset width value when the detected real-time rotation speed is higher than the set rotation speed and the error between the detected real-time rotation speed and the set rotation speed is not within a set range.

[0094] In some embodiments, when the error between the detected real-time rotation speed and the set rotation speed is not within a set range, adjusting the pulse width of the fan driving signal specifically includes the following steps:

[0095] In some embodiments, the fan drive signal pulse width is increased by δT when the real-time rotation speed is lower than the set rotation speed. If the real-time rotation speed is higher than the set rotation speed, the fan drive signal pulse width is decreased by δT. Each pulse width adjustment is adjusted by increasing or decreasing the fixed time δT based on the previous pulse width. This, on the one hand, makes it easier to count the number of pulse width adjustments. On the other hand, it maintains the stability of the fan rotation speed during rotation speed adjustment and reduces large fluctuations in the fan rotation speed due to changes in the drive signal. This ensures a good user experience. When the fan drive signal pulse width reaches T1 + N × T, the real-time rotation speed becomes equal to the set rotation speed, and the fan reaches a stable rotation state.

[0096] Here, T1 is the initial fan drive signal that is output to the fan drive circuit 140 according to the set rotation speed when a self-cleaning control command is received, N is the number of pulse width adjustments for which the error between the real-time rotation speed and the set rotation speed is within the set range, and T is the time that increases or decreases with each pulse width adjustment.

[0097] In some embodiments, the first width value and the second width value are both set to δT. Because the first width value and the second width value are the same magnitude, the amount of calculation required for adjusting the pulse width can be reduced. In other embodiments, the first width value and the second width value can be set to different values, and the settings of the first width value and the second width value can be adjusted according to actual conditions.

[0098] In some embodiments, the device is further configured to detect, if the error between the detected real-time rotation speed and the set rotation speed is within a set range, a duration during which the error between the real-time rotation speed and the set rotation speed is within the set range.

[0099] In some embodiments, the method is further configured to determine that the real-time rotation number is equal to the set rotation number when the detected duration reaches a preset set time.

[0100] In some embodiments, a certain difference between the real-time rotation speed and the set rotation speed is allowed by calculating the error between the real-time rotation speed and the set rotation speed, improving the situation where the calculation accuracy requirement for determining whether the rotation speeds are equal is too high and making the determination difficult.By detecting the duration when the real-time rotation speed and the set rotation speed are close to each other, it is ensured that the fan rotation speed has reached a stable state, improving the false determination when the fan rotation speed approaches the set rotation speed during an increase or decrease, and improving the accuracy of the determination that the real-time rotation speed and the set rotation speed are close to each other.

[0101] 7, in some embodiments, when a preset self-cleaning control command is received, the controller 100 may execute step S701 in response to the self-cleaning control command to control the fan to rotate at a preset rotation speed v1, i.e., output a fan drive signal at the preset rotation speed, which acts on the fan drive circuit 140, which drives the fan to rotate in accordance with the fan drive signal.

[0102] 7, in some embodiments, upon receiving a preset self-cleaning control command, the may perform step S702 in response to the self-cleaning control command to detect the real-time rotation speed v of the fan 135. That is, the real-time rotation speed v of the fan 135 is detected by the fan feedback device 138 and sent to the

[0103] In some embodiments, step S702 may be performed after step S701 is performed, but is not limited thereto. Step S702 and step S701 may also be performed synchronously, which is determined according to specific circumstances.

[0104] In some embodiments, referring to FIG. 7, after performing step S701 and step S702, step S703 may be further performed to determine whether the error δ between the real-time rotation speed vt and the set rotation speed v1 is within the range of [-0.05, 0.05].

[0105] 7, in some embodiments, if the determination in step S703 is negative, step S704 may be performed to adjust the pulse width of the fan driving signal, reset the duration, and return to step S702. That is, if the error between the detected real-time rotation speed vt and the set rotation speed v1 is not within the set range, the pulse width of the fan driving signal may be adjusted, and the real-time rotation speed vt of the fan may be detected again until the error between the detected real-time rotation speed vt and the set rotation speed v1 is within the set range.

[0106] 7, in some embodiments, if the determination in step S703 is YES, step S705 may be performed to calculate the duration K. That is, the duration K during which the error between the real-time rotation speed vt and the set rotation speed v1 is within a set range is detected, and the initial duration is 0.

[0107] In some embodiments, referring to FIG. 7, after performing step S705, step S706 may be further performed to determine whether the duration K≧Kth holds.

[0108] In some embodiments, if the determination in step S706 is negative, execution returns to step S702.

[0109] In some embodiments, if the determination in step S706 is YES, step S707 is executed to determine whether the real-time rotation speed vt is equal to the set rotation speed v1.

[0110] In some embodiments, may be provided inside the indoor unit 110, i.e., is located within the cover 143 of the indoor unit 110.

[0111] In some embodiments, the indoor unit 110 may include a , which is located within a cover 143 of the indoor unit 110 .

[0112] 4, in some embodiments, the air conditioner may further include an air guide plate 147 and an air guide plate stepping motor 148. The air guide plate 147 is provided at the air outlet of the indoor unit 110, and is configured to control the air blowing direction of the indoor unit. The air guide plate stepping motor 148 is connected to the air guide plate 147, and is configured to adjust the angle of the air guide plate 147.

[0113] 4 , in some embodiments, the indoor unit 110 may further include an air guide plate 147 and an air guide plate stepping motor 148. The air guide plate 147 is provided at the air outlet 146 of the cover 143, and the air guide plate 147 is configured to control the air blowing direction of the indoor unit 110. The air guide plate stepping motor 148 is connected to the air guide plate 147, and the air guide plate stepping motor 148 is configured to adjust the angle of the air guide plate 147.

[0114] In some embodiments, the controller is further configured to adjust the air guide plate 147 to a preset angle upon receiving a self-cleaning control command. That is, when the controller executes a self-cleaning program, the controller adjusts the air guide plate 147 to a preset angle upon receiving a self-cleaning control command, and controls the fan 135 to rotate at a preset rotation speed v1.

[0115] In some embodiments, the air guide plate stepping motor 148 is further configured to, upon receiving a self-cleaning control command, output an air guide plate driving signal to the air guide plate stepping motor 148. After receiving the air guide plate driving signal, the air guide plate stepping motor 148 adjusts the air guide plate 147 to a set angle, thereby adjusting the airflow direction of the indoor unit 110.

[0116] In some embodiments, based on the theory that different dust accumulation thicknesses on air conditioner filters result in different airway resistance and therefore different fan loads, when a cleaning program is executed, the fan 135 is set to a fixed rotation speed (i.e., a set rotation speed) and the air guide plate 147 is controlled to maintain a fixed airflow angle, eliminating the impact of other factors on the cleaning time. The required cleaning time is determined based on the input voltage (i.e., the DC voltage value) and the pulse width of the fan drive signal corresponding to the fan 135 when the fan 135 is rotating stably. This achieves the purpose of identifying the dust accumulation thickness on the filter and performing different cleaning times, successfully solving the problem of cleaning times being too short or too long due to undetected dust accumulation thickness on the filter, realizing more accurate control of the cleaning time, and improving the customer experience.

[0117] In some embodiments, the air conditioner may further include a rectifier circuit, which may include a rectifier bridge and a capacitor. The first and second terminals of the rectifier bridge are respectively connected to an AC power supply terminal. When the first and second terminals of the rectifier bridge receive an AC voltage from the AC power supply terminal, the rectifier bridge is configured to convert the AC voltage of the AC power supply terminal into a DC voltage. The third terminal of the rectifier bridge is configured to output the DC voltage, and the fourth terminal is grounded. The third terminal of the rectifier bridge is grounded via the capacitor.

[0118] In this embodiment, the DC voltage output from the third terminal of the rectifier bridge may be output to the fan 135 and used as the input voltage for the fan 135, but is not limited to this. The DC voltage output from the third terminal of the rectifier bridge may also be output to other devices that require this voltage, but these will not be illustrated one by one here.

[0119] In some embodiments, referring to FIG. 8, the air conditioner further includes a rectifier circuit, which includes a rectifier bridge D1 and a capacitor C1.

[0120] In some embodiments, the first and second terminals of the rectifier bridge D1 are configured to be connected to an AC power supply terminal, respectively, and the rectifier bridge D1 is configured to convert the AC voltage at the AC power supply terminal into a DC voltage. The fourth terminal of the rectifier bridge D1 is grounded, and the third terminal is grounded via a capacitor C1, and the third terminal is configured to output the DC voltage.

[0121] In some embodiments, referring to FIG. 8, a first end of the rectifier bridge D1 is connected to a live line L of the external AC power supply terminal, and a second end of the rectifier bridge D1 is connected to a neutral line N of the external AC power supply terminal.

[0122] In some embodiments, the air conditioner is configured to convert an external AC voltage into a DC voltage using a rectifier circuit, and then supply power to a DC device of the air conditioner. The strength of the DC voltage determines the operating power of the DC device, i.e., the voltage value of the DC voltage affects the rotation speed of a fan.

[0123] 8, in some embodiments, the voltage collecting circuit may include a first resistor R1, a second resistor R3, and an isolation photocoupler B1. A first end of the first resistor R1 is configured to be connected to the input voltage of the fan as an input end of the voltage collecting circuit. A second end of the first resistor R1 is connected to the primary input end of the isolation photocoupler B1, and the primary output end of the isolation photocoupler B1 is grounded. A secondary input end of the isolation photocoupler B1 is configured to be connected to a power supply VCC, and the secondary output end of the isolation photocoupler B1 is grounded via the second resistor R3. The secondary output end of the isolation photocoupler B1 is configured to output the detected input voltage as an output end of the voltage collecting circuit.

[0124] 8, in some embodiments, the voltage acquisition circuit may include a first resistor R1, a second resistor R3, and an isolation photocoupler B1. A first end of the first resistor R1 is configured to be connected to a DC voltage as an input end of the voltage acquisition circuit. A second end of the first resistor R1 is connected to a primary input end of the isolation photocoupler B1, and the primary output end of the isolation photocoupler B1 is grounded. A secondary input end of the isolation photocoupler B1 is configured to be connected to a power supply VCC, and the secondary output end of the isolation photocoupler B1 is grounded via the second resistor R3. The secondary output end of the isolation photocoupler B1 is configured to output a voltage value of the DC voltage as an output end of the voltage acquisition circuit.

[0125] 8, in the implementation of this embodiment, processes a signal received by the remote control receiving circuit 155 via the fourth port IO4, and the remote control receiving circuit 155 is configured to receive a control signal input by a user via a remote control. processes the fan feedback device 138 via the fifth port IO5 to detect the real-time rotation speed of the fan 135. controls the fan driving circuit 140 via the sixth port IO6 to realize the driving control of the fan 135.

[0126] In some embodiments, referring to FIG. 8, the voltage collection circuit of the air conditioner may detect the DC voltage rectified by the rectifier circuit, and its main components are a resistor R1, an isolation photocoupler B1, and a sampling resistor R3.

[0127] In some embodiments, the first terminal of the first resistor R1 is connected to a DC voltage as an input terminal of the voltage acquisition circuit and to an output terminal of the rectifier circuit, and the second terminal of the first resistor R1 is connected to a primary input terminal of the isolation photocoupler B1, and the primary output terminal of the isolation photocoupler B1 is grounded.

[0128] In some embodiments, the secondary input terminal of the isolation photocoupler B1 is connected to a power supply VCC, and the secondary output terminal of the isolation photocoupler B1 is grounded via a sampling resistor R3, and the secondary output terminal of the isolation photocoupler B1 is configured to output a detected voltage value of a DC voltage as an output terminal of a voltage collecting circuit.

[0129] In some embodiments, the first resistor R1 converts the DC voltage signal input from the output of the rectifier circuit into a current signal, which is then converted back into a voltage signal via the sampling resistor R3 after optical / electrical transmission via the isolation photocoupler B1. The output of the voltage acquisition circuit is sent to the seventh port IO7 of the chip for analog-to-digital (AD) conversion and processing, completing the voltage detection function.

[0130] In some embodiments, referring to FIG. 8 , the cleaning device may include a cleaning drive component and a brush 153, where the cleaning drive component is configured to drive and operate at least one of the brush 153 and the filter 136 upon receiving a cleaning command, causing the brush 153 to clean the filter 136.

[0131] 8 , in some embodiments, the cleaning drive components may include a filter transmission mechanism 149 and a filter stepper motor 150, where the filter transmission mechanism 149 connects the filter stepper motor 150 to the filter 136. The filter stepper motor 150 is configured to synchronously drive the filter transmission mechanism 149 to rotate when receiving a cleaning command, causing the filter 136 to rotate along the filter transmission mechanism 149, thereby causing the brush 153 to clean the filter 136.

[0132] In some embodiments, the filter 136 is structured to be rotatable clockwise or counterclockwise along a filter transmission mechanism 149. The filter transmission mechanism 149 rotates in synchronization with a filter stepping motor 150, thereby driving the filter 136 to rotate. The filter stepping motor 150 is a drive device for the filter transmission mechanism 149, and the filter stepping motor 150 drives the filter transmission mechanism 149 to rotate.

[0133] 8 , in some embodiments, the cleaning drive component may include a cleaning stepper motor 151 and a cleaning transmission mechanism 152, where the cleaning transmission mechanism 152 connects the cleaning stepper motor 151 and the brush 153. The cleaning stepper motor 151 is configured to synchronously drive the cleaning transmission mechanism 152 to rotate when receiving a cleaning command, causing the brush 153 to rotate along with the cleaning transmission mechanism 152, thereby causing the brush 153 to clean the filter 136.

[0134] In some embodiments, the cleaning stepper motor 151 is a drive device for the cleaning transmission mechanism 152 and serves to rotate the cleaning transmission mechanism 152. The cleaning transmission mechanism 152 rotates in synchronization with the cleaning stepper motor 151 to rotate the brush 153. The brush 153 is responsible for cleaning the filter 136.

[0135] In some embodiments, referring to FIG. 8, the stepping motor driver circuit 154 is controlled via the first port IO1, the second port IO2, and the third port IO3, and the stepping motor driver circuit 154 controls the air guide plate stepping motor 148, the cleaning stepping motor 151, and the filter stepping motor 150.

[0136] In some embodiments, the baffle plate stepper motor 148, the cleaning stepper motor 151 and the filter stepper motor 150 are pulsed four-phase eight-step stepper motors commonly used in the air conditioning industry.

[0137] In some embodiments, controls the filter stepping motor 150 via the stepping motor drive circuit 154 to synchronously rotate the filter transmission mechanism 149, causing the filter to rotate along the filter transmission mechanism 149. controls the cleaning stepping motor 151 via the stepping motor drive circuit 154 to synchronously rotate the cleaning transmission mechanism 152, causing the brush 153 to rotate along the cleaning transmission mechanism 152, and the brush 153 cleans the filter.

[0138] 8, in some embodiments, the air conditioner may further include a remote control 156, which is responsible for transmitting the user's air conditioning operation status and mode. The remote control 156 is provided with a dedicated self-cleaning mode control button, and when the user presses the self-cleaning mode control button, the remote control 156 can output a self-cleaning control command to the remote control receiving circuit 155.

[0139]

[0023] The present disclosure also provides a self-cleaning control method for an air conditioner, which is applied to an air conditioner. Referring to Figure 3, the air conditioner may include an indoor unit 110, a fan feedback device 138, a voltage collection circuit 139, and a fan drive circuit 140.

[0140] 4 , the indoor unit 110 may include a cover 143, an indoor heat exchanger 132, a fan 135, a filter 136, and a cleaning device 137. The indoor heat exchanger 132, the fan 135, the filter 136, and the cleaning device 137 are all disposed inside the cover 143.

[0141] In some embodiments, referring to FIG. 4 , the cover 143 is provided with an air inlet 144, and the fan 135 is located on a side of the indoor heat exchanger 132 away from the air inlet 135, and the fan 135 is configured to accelerate the flow rate of air passing through the indoor heat exchanger 132.

[0142] In some embodiments, referring to FIG. 4, the filter 136 is located between the indoor heat exchanger 132 and the air inlet, and the filter 136 is configured to filter the air passing through the indoor heat exchanger 132.

[0143] In some embodiments, the cleaning device 137 is provided inside the indoor unit 110 and is configured to clean the filter 136 upon receiving a cleaning command.

[0144] In some embodiments, the fan feedback device 138 is configured to detect the real-time rotation speed of the fan 135 .

[0145] In some embodiments, the voltage acquisition circuit 139 is configured to detect the input voltage of the fan 135 .

[0146] In some embodiments, the input voltage of the fan 135 may be a DC voltage value, which is a voltage value obtained by the air conditioner rectifying the AC voltage input from the AC power supply terminal.

[0147] In some embodiments, the fan drive circuit 140 is configured to drive the fan 135 to rotate upon receiving a fan drive signal.

[0148] In some embodiments, referring to FIG. 10, a self-cleaning control method for an air conditioner may include the following steps.

[0149] Step S1: Upon receiving a self-cleaning control command, a fan driving signal is output according to a set rotation speed to drive the fan, and the real-time rotation speed of the fan detected by the fan feedback device is obtained.

[0150] Step S2: If the detected real-time rotation speed is equal to the set rotation speed, obtain the pulse width of the fan driving signal and the input voltage detected by the voltage acquisition circuit.

[0151] Step S3: According to the pulse width and the input voltage, the corresponding cleaning time is matched from the preset cleaning time matching table.

[0152] Step S4: The output of the fan drive signal to the fan drive circuit is stopped to control the fan to stop operation, and a cleaning command is output in accordance with the cleaning time to control the cleaning device to complete cleaning of the filter.

[0153] In the air conditioner provided in this embodiment, when the fan drive circuit 140 receives the fan drive signal to drive the fan 135, the fan 135 may encounter a large resistance when actually rotating due to excessive dust adhering to the filter 136, forming a thick dust layer that affects the air blowing from the indoor unit 110. In this case, even when driven by the fan drive signal, the fan 135 may not reach the preset rotation speed. Therefore, after the fan drive circuit 140 outputs the corresponding drive signal to drive the fan 135, the air conditioner must further use the fan feedback device 138 to detect the rotation speed of the fan 135 and feedback the real-time rotation speed.

[0154] Furthermore, the voltage collecting circuit 139 is used to detect the voltage value V of the DC voltage obtained by rectifying the AC voltage input from the AC power supply terminal of the air conditioner.

[0155] For a constant DC voltage V, the pulse width of the fan drive signal is proportional to the thickness of dust accumulation on the filter. The thicker the dust accumulation on the filter, the greater the airflow resistance during operation, which increases the required fan drive signal pulse width T and the longer the filter cleaning time. Therefore, we tested the correspondence between the fan drive signal pulse width and cleaning time T for different DC voltage V values ​​and different filter dust accumulation thicknesses, created a VTP three-dimensional array cleaning time matching table, and fixed the parameter relationship between the cleaning time P, the drive signal pulse width T, and the drive signal voltage V. This allows us to match the corresponding cleaning time P according to the pulse width and voltage value, thereby controlling cleaning.

[0156] The present disclosure provides a more accurate calculation of the self-cleaning time of an air conditioner filter, thereby reducing unnecessary energy consumption and reducing the impact of unnecessary cleaning processes on the user's normal use of the air conditioner. Finally, more accurate control of the self-cleaning time reduces unnecessary operating time of the cleaning device, thereby extending the lifespan and improving reliability of the cleaning device. Implementing this control method improves the customer experience and product reliability.

[0157] It should be noted that the self-cleaning control method for an air conditioner provided in the embodiment of the present disclosure is the same as all the flow steps performed by the air conditioner in the above embodiment, and the operating principles and beneficial effects of both correspond to each other, so they will not be described in detail here.

[0158] Those skilled in the art will understand that all or part of the flow of the above-described exemplary methods can be realized by instructing relevant hardware using a computer program. This program can be stored in a computer-readable storage medium and can include the flow of each of the above-described exemplary methods when executed. Here, the storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), etc.

[0159] The above is a preferred embodiment of the present disclosure, but those skilled in the art may make some further improvements and modifications without departing from the principles of the present disclosure, and these improvements and modifications shall also fall within the scope of protection of the present disclosure.

Claims

1. An air conditioner, The indoor unit includes: a cover provided with an air inlet; an indoor heat exchanger provided inside the cover; a fan provided inside the cover, positioned away from the air inlet of the indoor heat exchanger, and configured to accelerate the flow rate of air passing through the indoor heat exchanger during rotation; a filter provided inside the cover, positioned between the indoor heat exchanger and the air inlet, and configured to filter air passing through the indoor heat exchanger; a cleaning device disposed within the cover and configured to clean the filter upon receiving a cleaning command; a fan drive circuit configured to drive the fan in rotation upon receiving a fan drive signal; a fan feedback device configured to detect a real-time rotation speed of the fan; a voltage acquisition circuit configured to detect an input voltage of the fan; When receiving a self-cleaning control command, output a fan drive signal according to a set rotation speed to rotate the fan, and obtain a real-time rotation speed of the fan detected by the fan feedback device; If the detected real-time rotation speed is equal to the set rotation speed, the pulse width of the fan drive signal and the input voltage detected by the voltage acquisition circuit are acquired; Matching a corresponding cleaning time from a preset cleaning time matching table according to the pulse width and the input voltage; a controller configured to stop output of the fan drive signal to control the fan to stop operation, and to output a cleaning command in accordance with the cleaning time to control the cleaning device to complete cleaning of the filter.

2. The controller further comprises: If the error between the detected real-time rotation speed and the set rotation speed is not within a set range, the pulse width of the fan drive signal is adjusted; If the error between the detected real-time rotation speed and the set rotation speed is within the set range, a duration during which the error between the real-time rotation speed and the set rotation speed is within the set range is detected; The air conditioner according to claim 1 , wherein the air conditioner is configured to determine that the detected real-time rotation speed is equal to the set rotation speed when the detected duration reaches a set time.

3. The controller further comprises: If the detected real-time rotation speed is lower than the set rotation speed, increasing a pulse width of the fan driving signal by a first width value that is set in advance; The air conditioner according to claim 2 , further comprising: a second width value that is preset to reduce a pulse width of the fan drive signal when the detected real-time rotation speed is higher than the set rotation speed.

4. The air conditioner of claim 3 , wherein the first width value and the second width value are equal.

5. The cover is further provided with an air outlet, and the indoor unit is an air guide plate provided at the air outlet of the cover and configured to adjust the air blowing direction of the indoor unit; a baffle plate stepping motor connected to the baffle plate and configured to adjust the angle of the baffle plate; The controller further comprises: The air conditioner according to claim 1 , configured to control the baffle plate stepping motor to adjust the baffle plate to a preset angle when a self-cleaning control command is received.

6. The air conditioner is further comprising a rectifier circuit including a rectifier bridge and a capacitor; a first end and a second end of the rectifier bridge are configured to be connected to the AC power supply terminals, respectively, and the rectifier bridge is configured to convert an AC voltage at the AC power supply terminals into a DC voltage; a third end of the rectifier bridge is grounded via the capacitor, and the third end of the rectifier bridge is configured to output a DC voltage, and the DC voltage serves as an input voltage of the fan; The air conditioner according to claim 1 , wherein a fourth end of the rectifier bridge is grounded.

7. the voltage acquisition circuit includes a first resistor, a second resistor, and an isolation photocoupler; a first end of the first resistor is configured to be connected to the input voltage as an input end of the voltage acquisition circuit, a second end of the first resistor is connected to a primary input end of the isolation photocoupler, and a primary output end of the isolation photocoupler is grounded; 2. The air conditioner according to claim 1, wherein a secondary-side input terminal of the isolation photocoupler is configured to be connected to a power supply, a secondary-side output terminal of the isolation photocoupler is grounded via the second resistor, and the secondary-side output terminal of the isolation photocoupler is configured to output the detected input voltage as an output terminal of the voltage collection circuit.

8. 2. The air conditioner of claim 1, wherein the cleaning device includes a cleaning drive component and a brush, and the cleaning drive component is configured to, upon receiving the cleaning command, drive and move at least one of the brush and the filter, and cause the brush to clean the filter.

9. the cleaning drive component includes a cleaning stepper motor and a cleaning transmission mechanism, the cleaning transmission mechanism connecting the cleaning stepper motor and the brush; 9. The air conditioner according to claim 8, wherein the cleaning stepping motor is configured to, upon receiving the cleaning command, synchronously drive the cleaning transmission mechanism to rotate, and rotate the brush along the cleaning transmission mechanism, thereby causing the brush to clean the filter.

10. the cleaning drive component includes a filter stepper motor and a filter transmission mechanism, the filter transmission mechanism connecting the filter stepper motor and the filter; 10. The air conditioner according to claim 8, wherein the filter stepping motor is configured to, upon receiving the cleaning command, synchronously drive and rotate the filter transmission mechanism, thereby rotating the filter along the filter transmission mechanism, thereby causing the brush to clean the filter.

11. A self-cleaning control method for an air conditioner, comprising: The indoor unit includes: a cover provided with an air inlet; an indoor heat exchanger provided inside the cover; a fan provided inside the cover, positioned away from the air inlet of the indoor heat exchanger, and configured to accelerate the flow rate of air passing through the indoor heat exchanger during rotation; a filter provided inside the cover, positioned between the indoor heat exchanger and the air inlet, and configured to filter air passing through the indoor heat exchanger; a cleaning device disposed within the cover and configured to clean the filter upon receiving a cleaning command; a fan drive circuit configured to drive the fan in rotation upon receiving a fan drive signal; a fan feedback device configured to detect a real-time rotation speed of the fan; a voltage acquisition circuit configured to detect an input voltage of the fan; The self-cleaning control method includes: When receiving a self-cleaning control command, outputting a fan drive signal according to a set rotation speed to rotate the fan, and obtaining a real-time rotation speed of the fan detected by the fan feedback device; If the detected real-time rotation speed is equal to the set rotation speed, acquiring the pulse width of the fan driving signal and the input voltage detected by the voltage acquisition circuit; Matching a corresponding cleaning time from a preset cleaning time matching table according to the pulse width and the input voltage; stopping output of the fan drive signal to the fan drive circuit to control the fan to stop operation, and outputting a cleaning command in accordance with the cleaning time to control the cleaning device to complete cleaning of the filter.

12. The cleaning control method includes: adjusting a pulse width of the fan drive signal when an error between the detected real-time rotation speed and the set rotation speed is not within a set range; If the error between the detected real-time rotation speed and the set rotation speed is within the set range, detecting a duration during which the error between the real-time rotation speed and the set rotation speed is within the set range; The self-cleaning control method for an air conditioner according to claim 11, further comprising: when the detected duration reaches a set time, determining that the detected real-time rotation speed is equal to the set rotation speed.

13. The cleaning control method includes: increasing a pulse width of the fan driving signal by a first width value set in advance when the detected real-time rotation speed is lower than the set rotation speed; 13. The self-cleaning control method of claim 12, further comprising: reducing a pulse width of the fan drive signal by a second preset width value when the detected real-time rotation speed is higher than the set rotation speed.

Images