Fan control method and device and air conditioner

Abstract

The invention relates to the technical field of air conditioners, and discloses a fan control method and device and an air conditioner. The control method of the fan comprises the steps that the total weight of dust deposited on the fan blades is determined; determining a deviation coefficient according to the relation between the total weight of the dust and the initial weight of the fan blades; and under the condition that the deviation coefficient is not smaller than the first deviation threshold value and not larger than the second deviation threshold value, the draught fan is controlled to increase the starting current and prolong the starting slope time, or the running draught fan is controlled to reduce the rotating speed. When the deviation coefficient is within a reasonable range, the system effectively solves the problem that the inertia of the fan blades is increased by increasing the starting current and prolonging the starting slope time. Larger torque can be provided by increasing the starting current, static friction and inertial resistance are overcome, and starting failure or motor overload caused by insufficient torque is avoided; meanwhile, the acceleration requirement can be reduced by prolonging the starting slope time, the motor can stably reach the target rotating speed, and mechanical stress and current impact are reduced.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to a fan control method, control device, and air conditioner. Background Technology

[0002] In wind turbine (such as fans and wind turbines) drive systems, blade weight is a critical parameter that directly affects the performance, energy consumption, mechanical stability, and lifespan of the control system. Taking an outdoor air conditioning unit as an example, because it is exposed to the outdoors for extended periods and is typically only used during the summer, after a year of inactivity, outdoor fan blades easily accumulate a large amount of dust. The starting and operating parameters set at the factory are usually based on the weight of clean blades, but dust accumulation causes the actual weight of the blades to change. If the original starting and operating parameters are still used, it will have several negative impacts on the wind turbine drive system: increased blade weight increases the load torque on the drive motor, easily causing start-up failures or overload problems; simultaneously, reduced acceleration leads to a longer time to reach the target speed; increased rotational inertia further slows down the system response speed, and external disturbances have a more significant impact on heavy blades. Furthermore, changes in blade weight may also affect the system's natural frequency, inducing resonance in some cases.

[0003] Therefore, effectively addressing one of the aforementioned problems caused by changes in fan blade weight has become a pressing technical challenge for the industry. Summary of the Invention

[0004] The present invention provides a fan control method, control device and air conditioner to solve the above-mentioned defects in at least one aspect of the existing fan drive system caused by the change of fan blade weight.

[0005] This invention provides a method for controlling a fan, comprising: Determine the total weight of dust deposited on the fan blades; The deviation coefficient is determined based on the relationship between the total weight of dust and the initial weight of the fan blades; If the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold, control the fan to increase the starting current and extend the starting ramp time, or control the running fan to reduce the speed.

[0006] According to the fan control method provided by the present invention, the step of "determining the deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades" includes: The ratio of the total weight of dust to the initial weight of the fan blades is used as the deviation coefficient.

[0007] According to the fan control method provided by the present invention, the "controlling the fan's starting current and starting ramp time" includes: Based on the linear relationship between the deviation coefficient and the first parameter correction factor, the target first parameter correction factor is determined, wherein the deviation coefficient is positively correlated with the first parameter correction factor; Based on the relationship between the target first parameter correction factor and the initial starting current of the fan, the improved starting current of the fan is determined so as to control the fan to start according to the improved starting current; Based on the relationship between the target first parameter correction factor and the initial start-up ramp time of the wind turbine, the improved start-up ramp time is determined so as to control the wind turbine to start according to the improved start-up ramp time.

[0008] According to the fan control method provided by the present invention, the "controlling the running fan to reduce its speed" includes: Based on the linear relationship between the deviation coefficient and the second parameter correction factor, the target second parameter correction factor is determined, wherein the deviation coefficient is negatively correlated with the second parameter correction factor; Based on the relationship between the target second parameter correction factor and the current speed of the fan, the reduced target speed is determined so as to control the fan to operate at the target speed.

[0009] According to the fan control method provided by the present invention, after the "determining the deviation coefficient", the method further includes: If the deviation coefficient is greater than the second deviation threshold, the fan is controlled to rotate in reverse for dust removal; If the deviation coefficient is determined to be less than the first deviation threshold, the fan is controlled to start with the initial starting current and the initial starting ramp time, or the fan is controlled to continue running at the current speed.

[0010] According to the fan control method provided by the present invention, the "controlling the fan to rotate in reverse for dust removal" includes: Based on the linear relationship between the deviation coefficient and the third parameter correction factor, the target third parameter correction factor is determined, wherein the deviation coefficient and the third parameter correction factor are positively correlated. Based on the relationship between the target third parameter correction factor and the dust removal speed threshold, the first dust removal speed is determined, and the fan is controlled to rotate in the opposite direction at the first dust removal speed for a first time threshold.

[0011] According to the fan control method provided by the present invention, after the step of "determining the first dust removal speed and controlling the fan to rotate in the opposite direction of the first dust removal speed for a first time threshold", the method further includes: Control the fan to rotate forward at the first dust removal speed and the second time threshold.

[0012] According to the fan control method provided by the present invention, the step of "determining the total weight of dust deposited on the fan blades" includes: Determine the area ratio of the fan blade area to the area of ​​the sensor installed on the fan blade; The total weight of dust deposited on the fan blades is determined by multiplying the total weight of the first dust deposited on all sensors by the ratio of the area.

[0013] A second aspect of the present invention provides a control device for a fan, comprising: The first determining module is used to determine the total weight of dust deposited on the fan blades; The second determining module is used to determine the deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades; The control module is used to control the fan to increase the starting current and starting ramp time, or to control the running fan to reduce its speed, provided that the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold.

[0014] A third aspect of the present invention provides an air conditioner including the control device for the aforementioned fan.

[0015] The fan control method provided by this invention quantifies the actual weight gain of the fan blades by determining the total weight of dust, thus transforming the ambiguous "dust accumulation effect" into a specific control input. Further calculation of the deviation coefficient standardizes the weight deviation, providing a precise basis for subsequent control decisions. This mechanism avoids control blind spots caused by unknown changes in fan blade weight, achieving a shift from passive response to active compensation. When the deviation coefficient is within a reasonable range (i.e., between the first and second deviation thresholds), the system effectively addresses the problem of increased fan blade inertia by increasing the starting current and extending the starting ramp time. Increasing the starting current provides greater torque, overcoming static friction and inertial resistance, and preventing starting failure or motor overload due to insufficient torque; simultaneously, extending the starting ramp time reduces acceleration requirements, allowing the motor to smoothly reach the target speed, reducing mechanical stress and current surges.

[0016] If a significant increase in blade weight is detected during wind turbine operation, the system can proactively reduce the rotational speed. This strategy directly alleviates the load on the motor, reduces response lag caused by increased rotational inertia, and minimizes the amplified impact of external disturbances (such as gusts of wind or mechanical vibration) on the heavy-duty blades. Furthermore, reduced speed operation helps avoid resonance zones that may be caused by changes in the structure's inherent frequency, thus improving the system's mechanical safety.

[0017] By setting upper and lower limits for the deviation coefficient (i.e., the first deviation threshold and the second deviation threshold), the system can adjust parameters within a reasonable range, preventing forced operation even when excessive dust accumulation (such as exceeding the second threshold) poses a risk to the mechanical structure or causes control failure. This demonstrates the balance between controllability and safety achieved by this method, leveraging the adaptability of the control strategy while ensuring that the equipment does not operate under uncontrollable conditions. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is one of the flowcharts illustrating the fan control method provided by the present invention.

[0020] Figure 2 This is the second flowchart of the fan control method provided by the present invention.

[0021] Figure 3 This is a schematic diagram of the control device for the fan provided by the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the air conditioner provided by the present invention; a, b and c in the figure represent the installation positions of the sensors.

[0023] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0025] In the description of this specification, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing this specification. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this specification. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this specification, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this invention based on the specific circumstances.

[0027] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this specification. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0029] In the embodiments of this specification, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0030] The following is combined Figures 1 to 5 The control method, control device, and air conditioner of the present invention will be described.

[0031] The execution subject of the wind turbine control method provided in the embodiments of the present invention can be a controller or a control device provided in the embodiments of the present invention.

[0032] like Figure 1As shown, a specific embodiment of the first aspect of the present invention provides a method for controlling a fan. The method for controlling the fan includes: S110. Determine the total weight of dust deposited on the fan blades.

[0033] S120. Determine the deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades.

[0034] S130. If the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold, control the fan to increase the starting current and the starting ramp time, or control the running fan to reduce the speed.

[0035] In this embodiment, by determining the total weight of dust in S110, the system can quantify the actual increase in the weight of the fan blades, thereby transforming the vague "dust accumulation effect" into a specific control input. S120 further calculates the deviation coefficient, standardizing the weight deviation and providing a precise basis for subsequent control decisions. This mechanism avoids control blind spots caused by unknown changes in fan blade weight, realizing a shift from passive response to active compensation. When the deviation coefficient is within a reasonable range (i.e., between the first and second deviation thresholds), the system effectively addresses the problem of increased fan blade inertia by increasing the starting current and extending the starting ramp time. Increasing the starting current provides greater torque, overcoming static friction and inertial resistance, and preventing starting failure or motor overload due to insufficient torque; simultaneously, extending the starting ramp time reduces acceleration requirements, allowing the motor to smoothly reach the target speed, reducing mechanical stress and current surges.

[0036] If a significant increase in blade weight is detected during wind turbine operation, the system can proactively reduce the rotational speed. This strategy directly alleviates the load on the motor, reduces response lag caused by increased rotational inertia, and minimizes the amplified impact of external disturbances (such as gusts of wind or mechanical vibration) on the heavy-duty blades. Furthermore, reduced speed operation helps avoid resonance zones that may be caused by changes in the structure's inherent frequency, thus improving the system's mechanical safety.

[0037] By setting upper and lower limits for the deviation coefficient (i.e., the first deviation threshold and the second deviation threshold), the system can adjust parameters within a reasonable range, preventing forced operation even when excessive dust accumulation (such as exceeding the second threshold) poses a risk to the mechanical structure or causes control failure. This demonstrates the balance between controllability and safety achieved by this method, leveraging the adaptability of the control strategy while ensuring that the equipment does not operate under uncontrollable conditions.

[0038] like Figure 2 As shown, in some embodiments of the present invention, after "determining the deviation coefficient", the following steps are also included: If the deviation coefficient is greater than the second deviation threshold d2, control the fan to rotate in reverse for dust removal; If the deviation coefficient is less than the first deviation threshold d1, the fan is controlled to start with the initial starting current and the initial starting ramp time, or the fan is controlled to continue running at the current speed.

[0039] In this embodiment, when the deviation coefficient exceeds the second deviation threshold, it indicates that dust accumulation is severe, and simply adjusting electrical parameters may prevent safe startup or seriously damage the system's lifespan. At this point, the fan is controlled to rotate in reverse for dust removal. This design departs from the framework of "passively adapting to weight changes" and actively eliminates the underlying causes, addressing the issue of increased fan blade weight at its source and avoiding the risk of mechanical overload or motor burnout that could result from forced operation under extreme conditions. This design endows the equipment with self-maintenance capabilities, making it particularly suitable for unattended installations or locations where cleaning is inconvenient (such as outdoor units in high-rise buildings), significantly reducing user maintenance costs and lowering the barrier to entry, while enhancing product reliability.

[0040] When the deviation coefficient is less than the first deviation threshold, it indicates that the fan blades are clean or the dust accumulation is negligible. At this point, the fan is controlled to start with initial parameters or maintain the current speed. This design avoids unnecessarily increasing the current or extending the start-up time for clean fan blades, ensuring that the fan always operates in the most efficient and energy-saving mode. It eliminates the additional energy consumption that the control strategy itself may introduce, meeting the requirements of economy and environmental protection. This design also ensures that the system operates at its optimal performance point, helping to extend the lifespan of the fan's mechanical structure.

[0041] The wind turbine control method in this embodiment forms a three-level control system. The first level ensures efficiency by setting the deviation coefficient to be less than a first parameter threshold. The second level ensures the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold, enabling proactive adaptation to changes in blade weight. The third level ensures that the deviation coefficient is greater than the second deviation threshold, fundamentally solving a series of problems caused by changes in blade weight.

[0042] It should be noted that when the fan rotates in the forward direction, it is used for air discharge, such as expending air from inside the outdoor unit's casing to the outside. When the fan rotates in the reverse direction, the direction of rotation is opposite to that of forward rotation.

[0043] In some embodiments of the present invention, "determining a deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades" includes: using the ratio of the total weight of dust to the initial weight of the fan blades as the deviation coefficient. Specifically, the control device uses the ratio of the total weight of dust to the initial weight of the fan blades as the deviation coefficient, which is typically less than 1.

[0044] In this embodiment, the ratio is a dimensionless number that clearly reflects the relative degree of change in fan blade weight, rather than an absolute weight value. This allows the system to uniformly assess and classify the degree of pollution without needing to consider the specific model or size of the fan blades, greatly enhancing the versatility and portability of the control algorithm. The first and second deviation thresholds thus become dimensionless standardized parameters. Regardless of the fan model, if the deviation coefficient exceeds the second deviation threshold, it indicates that the weight gain has reached a "severe" level requiring active dust removal. This allows a fixed set of control logic to be adapted to the entire product series, significantly reducing the complexity of parameter tuning and software development, and achieving standardization of the control strategy.

[0045] In some embodiments of the present invention, "controlling the fan's starting current and starting ramp time" includes: Based on the linear relationship between the deviation coefficient and the first parameter correction factor, the target first parameter correction factor is determined, wherein the deviation coefficient and the first parameter correction factor are positively correlated. Based on the relationship between the target first parameter correction factor and the initial starting current of the fan, the starting current of the fan after the increase is determined, so as to control the fan to start according to the increased starting current; Based on the relationship between the target first parameter correction factor and the initial start-up ramp time of the wind turbine, the improved start-up ramp time is determined so as to control the wind turbine to start up according to the improved start-up ramp time.

[0046] In this embodiment, the linear relationship between the deviation coefficient and the first parameter correction factor ensures that the adjustment of the control quantity is proportional to the degree of dust accumulation. The more severe the dust accumulation (i.e., the larger the deviation coefficient), the greater the increase in starting current and ramp time. This design ensures that the control output can accurately match the actual load changes, avoiding both start-up failures caused by under-adjustment and energy waste or stress shocks caused by over-adjustment.

[0047] By simultaneously and proportionally increasing the starting current and starting ramp time, the system can provide greater starting torque while giving the motor a more ample acceleration process. This effectively prevents the instantaneous torque shock that might result from simply increasing the current, achieving a smooth and gentle start-up, significantly reducing impact wear on mechanical components such as gears and bearings, and improving system reliability and lifespan.

[0048] The "first parameter correction factor" serves as an intermediate variable, decoupling the core observation (deviation coefficient) from the final execution parameters (current, time). By simply adjusting the slope or intercept of the linear relationship (i.e., modifying the calculation formula of the first parameter correction factor), this strategy can be easily adapted to wind turbine products of different power and models, enhancing the algorithm's versatility and scalability.

[0049] Optionally, the first parameter correction factor can be determined based on the deviation coefficient and in conjunction with formula (1). .

[0050] Formula (1).

[0051] In formula (1), and All are constants. This is the deviation coefficient.

[0052] Preferred, and All are 1.

[0053] Optionally, the control device may use the product of the first parameter correction factor and the initial starting current of the fan as the starting current of the fan after the upgrade; the control device may use the product of the first parameter correction factor and the initial starting ramp time of the fan as the starting ramp time of the fan after the upgrade.

[0054] In this embodiment, if the deviation coefficient indicates a 15% increase in fan blade weight (i.e., a correction factor of 1.15), the starting current is also precisely increased by 15%. This one-to-one linear scaling relationship directly implements the principle of on-demand allocation, ensuring a perfect match between the increase in torque and the increase in inertial load. This in principle guarantees the optimal balance between startup reliability and efficiency, avoiding insufficient or excessive compensation. This embodiment scales based on the optimal initial value of the fan, essentially replicating and approximating the original optimal startup curve as closely as possible under dust accumulation conditions. It ensures that adjustments to the control strategy are always based on a verified, safe, and reliable foundation, rather than redefining a set of potentially risky startup parameters.

[0055] It should be noted that "the deviation coefficient is positively correlated with the first parameter correction factor" means that as the deviation coefficient increases, the first parameter correction factor also increases; and as the deviation coefficient decreases, the first parameter correction factor also decreases.

[0056] In some embodiments of the present invention, "controlling the running fan to reduce its speed" includes: Based on the linear relationship between the deviation coefficient and the second parameter correction factor, the target second parameter correction factor is determined, wherein the deviation coefficient and the second parameter correction factor are negatively correlated. Based on the relationship between the target second parameter correction factor and the current speed of the fan, the reduced target speed is determined so as to control the fan to operate at the target speed.

[0057] In this embodiment, the larger the deviation coefficient (i.e., the more severe the dust accumulation), the smaller the second parameter correction factor, resulting in a greater reduction in the target speed. This precise inverse proportional relationship ensures that the speed reduction matches the increase in load, keeping the fan operating within a safe range of torque and power under the current dust accumulation conditions. This fundamentally avoids the risk of motor overheating, sudden efficiency drops, or damage due to overload. Forcing the fan to continue operating at its original high speed after dust accumulation would cause it to deviate from its high-efficiency zone, increasing current but decreasing output airflow and reducing energy efficiency. Active speed reduction essentially pulls the operating point back into the high-efficiency range, reducing unnecessary energy consumption while outputting the required airflow. Dust accumulation leads to uneven distribution of fan blade mass, causing vibration and noise. Reducing the speed can significantly reduce centrifugal force, effectively suppressing the increased vibration and noise caused by imbalance, improving system mechanical stability and user experience. Increased fan blade weight leads to increased rotational inertia, slower system response, and greater sensitivity to external disturbances (such as gusts of wind and voltage fluctuations). Reducing the rotational speed is equivalent to reducing the system's kinetic energy, which significantly weakens the impact of external disturbances on the wind turbine's operating state and improves its anti-interference ability and robustness in complex real-world environments.

[0058] It should be noted that "the deviation coefficient is negatively correlated with the second parameter correction factor" means that as the deviation coefficient increases, the second parameter correction factor decreases; and as the deviation coefficient decreases, the second parameter correction factor increases.

[0059] Optionally, the second parameter correction factor can be calculated based on the deviation coefficient and in conjunction with formula (2). .

[0060] Formula (2).

[0061] In formula (1), and All are constants, and Less than 0, This is the deviation coefficient.

[0062] Preferred, =1, It is -1.

[0063] Optionally, the control unit can use the product of the target second parameter correction factor and the current speed of the fan as the reduced target speed. This approach involves minimal computational burden, provides real-time response, and is easily implemented on controllers of various performance levels.

[0064] In some embodiments of the invention, "controlling the fan to rotate in reverse for dust removal" includes: Based on the linear relationship between the deviation coefficient and the third parameter correction factor, the target third parameter correction factor is determined, wherein the deviation coefficient and the third parameter correction factor are positively correlated. Based on the relationship between the target third parameter correction factor and the dust removal speed threshold, the first dust removal speed is determined, and the fan is controlled to rotate in the opposite direction of the first dust removal speed for the first time threshold.

[0065] In this embodiment, the larger the deviation coefficient (i.e., the more severe the dust accumulation), the larger the third parameter correction factor, thus determining a higher first cleaning speed. This design ensures that the cleaning intensity is proportional to the severity of the contamination. For heavy dust accumulation, a higher reverse speed generates greater centrifugal force, more effectively removing stubborn dust; for light dust accumulation, a lower speed is used to avoid energy waste and unnecessary mechanical wear, achieving precise and efficient on-demand cleaning. This design upgrades the cleaning operation from a blind, fixed-intensity mechanical action to a closed-loop process that senses the environment and makes intelligent decisions. The system can automatically determine "how dirty" the dust is and decide "how much force to use" accordingly, without user intervention, greatly improving the product's intelligence level and user experience, and is particularly suitable for unattended application scenarios. It avoids the energy waste of using the highest intensity cleaning regardless of the degree of dust accumulation. By distributing cleaning energy proportionally through a linear relationship, the overall energy consumption is lower and the operation is more economical while achieving the same cleaning effect, conforming to the design concept of energy conservation and environmental protection.

[0066] Optionally, the third parameter correction factor can be determined based on the deviation coefficient and in conjunction with formula (3). .

[0067] Formula (1).

[0068] In formula (1), and All are constants. Greater than zero, This is the deviation coefficient.

[0069] Preferred, and All are 1.

[0070] Optionally, the control device uses the product of the third parameter correction factor and the dust removal speed threshold as the first dust removal speed. In this embodiment, a fixed dust removal speed threshold is essentially scaled up as needed. This ensures both the effectiveness of the dust removal operation and that the speed is always constrained within a reasonable range, preventing damage to the motor or mechanical structure due to excessive speed (exceeding the design safety margin), thus achieving a dual guarantee of dust removal effect and system safety.

[0071] Optionally, the dust removal speed threshold can be the medium wind speed designed for the fan. This medium wind speed can be directly retrieved from the fan's design parameters.

[0072] Furthermore, after "determining the first dust removal speed and controlling the fan to rotate in the opposite direction at the first dust removal speed for a first time threshold", it also includes: controlling the fan to rotate in the forward direction at the first dust removal speed for a second time threshold.

[0073] like Figure 4 As shown, in some embodiments of the present invention, each blade of the fan is equipped with a strain gauge load cell, and each strain gauge load cell is electrically connected to a control device. The strain gauge load cell is used to detect the weight of dust deposited on itself.

[0074] Optional, “Determine the total weight of dust deposited on the fan blades” includes: Determine the area ratio of the fan blade area to the area of ​​the sensor installed on the fan blade; The total weight of dust deposited on the fan blades is determined by multiplying the total weight of the first dust deposited on all sensors by the ratio of the area.

[0075] In this embodiment, online, real-time weight estimation is achieved without disassembling the fan or using external equipment for manual inspection. The system can continuously monitor dust accumulation during fan operation or standby, providing real-time, continuous data input for subsequent control strategies, truly realizing a fully automated intelligent control closed loop. The estimation is based on the "area ratio method," which assumes that the dust deposition distribution on the fan blade surface is uniform or regular. While slight uneven distribution may exist in actual operating conditions, the estimation accuracy is sufficient for control system-level decisions. This method transforms the complex overall measurement problem into a simple scalar multiplication, achieving extremely high computational efficiency while ensuring sufficient accuracy.

[0076] like Figure 3 As shown, a specific embodiment of the second aspect of the present invention provides a control device for a wind turbine. The control device includes a first determining module, a second determining module, and a control module.

[0077] The first determining module is used to determine the total weight of dust deposited on the fan blades. The second determining module is used to determine a deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades. The control module is used to control the fan to increase the starting current and starting ramp time, or to control the running fan to decrease its speed, provided that the deviation coefficient is not less than a first deviation threshold and not greater than a second deviation threshold.

[0078] In this embodiment, the total weight of dust is first determined, allowing the system to quantify the actual weight gain of the fan blades, thus transforming the vague "dust accumulation effect" into a specific control input. Further calculation of the deviation coefficient standardizes the weight deviation, providing a precise basis for subsequent control decisions. This mechanism avoids control blind spots caused by unknown changes in fan blade weight, achieving a shift from passive response to active compensation. When the deviation coefficient is within a reasonable range (i.e., between the first and second deviation thresholds), the system effectively addresses the problem of increased fan blade inertia by increasing the starting current and extending the starting ramp time. Increasing the starting current provides greater torque, overcoming static friction and inertial resistance, and preventing starting failure or motor overload due to insufficient torque; simultaneously, extending the starting ramp time reduces acceleration requirements, allowing the motor to smoothly reach the target speed, reducing mechanical stress and current surges.

[0079] If a significant increase in blade weight is detected during wind turbine operation, the system can proactively reduce the rotational speed. This strategy directly alleviates the load on the motor, reduces response lag caused by increased rotational inertia, and minimizes the amplified impact of external disturbances (such as gusts of wind or mechanical vibration) on the heavy-duty blades. Furthermore, reduced speed operation helps avoid resonance zones that may be caused by changes in the structure's inherent frequency, thus improving the system's mechanical safety.

[0080] By setting upper and lower limits for the deviation coefficient (i.e., the first deviation threshold and the second deviation threshold), the system can adjust parameters within a reasonable range, preventing forced operation even when excessive dust accumulation (such as exceeding the second threshold) poses a risk to the mechanical structure or causes control failure. This demonstrates the balance between controllability and safety achieved by this method, leveraging the adaptability of the control strategy while ensuring that the equipment does not operate under uncontrollable conditions.

[0081] A specific embodiment of a third aspect of the present invention provides an air conditioner. This air conditioner includes a control device for the fan as described in any of the above embodiments.

[0082] Since the air conditioner of the present invention includes the control device of any of the above embodiments, it has at least the above advantages, which will not be repeated here.

[0083] like Figure 4 As shown, the air conditioner further includes an outdoor unit; the outdoor unit includes an outdoor unit casing and a fan installed inside the outdoor unit casing. Each fan blade is equipped with a strain gauge load cell. The strain gauge load cell can detect the weight of dust deposited on it, and then send the weight of the dust deposited on it to a control device. The control device can determine the weight of dust deposited on that fan blade by multiplying the area ratio (i.e., the ratio of the fan blade area to the corresponding sensor area) by the weight of dust detected by the sensor.

[0084] Figure 5An example is a schematic diagram of the physical structure of an electronic device, such as... Figure 5 As shown, the electronic device may include a processor 810, a communications interface 820, a memory 830, and a communication bus 840. The processor 810, communications interface 820, and memory 830 communicate with each other via the communication bus 840. The processor 810 can call logic instructions in the memory 830 to execute a fan control method. This method includes: determining the total weight of dust deposited on the fan blades; determining a deviation coefficient based on the relationship between the total dust weight and the initial weight of the fan blades; and controlling the fan to increase the starting current and extend the starting ramp time, or controlling the running fan to reduce its speed, provided that the deviation coefficient is not less than a first deviation threshold and not greater than a second deviation threshold.

[0085] Furthermore, the logical instructions in the aforementioned memory 830 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0086] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the fan control method provided by the above methods. The method includes: determining the total weight of dust deposited on the fan blades and determining a deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades; and controlling the fan to increase the starting current and extend the starting ramp time when the deviation coefficient is not less than a first deviation threshold and not greater than a second deviation threshold, or controlling the running fan to reduce its speed.

[0087] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a fan control method provided by the above methods, the method comprising: determining the total weight of dust deposited on the fan blades, determining a deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades; and controlling the fan to increase the starting current and extend the starting ramp time when the deviation coefficient is not less than a first deviation threshold and not greater than a second deviation threshold, or controlling the running fan to reduce its speed.

[0088] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0089] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling a fan, characterized in that, include: Determine the total weight of dust deposited on the fan blades; The deviation coefficient is determined based on the relationship between the total weight of dust and the initial weight of the fan blades; If the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold, control the fan to increase the starting current and extend the starting ramp time, or control the running fan to reduce the speed.

2. The fan control method according to claim 1, characterized in that, The phrase "determining the deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades" includes: The ratio of the total weight of dust to the initial weight of the fan blades is used as the deviation coefficient.

3. The fan control method according to claim 2, characterized in that, The "controlling the fan's starting current and starting ramp time" includes: Based on the linear relationship between the deviation coefficient and the first parameter correction factor, the target first parameter correction factor is determined, wherein the deviation coefficient is positively correlated with the first parameter correction factor; Based on the relationship between the target first parameter correction factor and the initial starting current of the fan, the improved starting current of the fan is determined so as to control the fan to start according to the improved starting current; Based on the relationship between the target first parameter correction factor and the initial start-up ramp time of the wind turbine, the improved start-up ramp time is determined so as to control the wind turbine to start according to the improved start-up ramp time.

4. The fan control method according to claim 2, characterized in that, The phrase "controlling the running fan to reduce its speed" includes: Based on the linear relationship between the deviation coefficient and the second parameter correction factor, the target second parameter correction factor is determined, wherein the deviation coefficient is negatively correlated with the second parameter correction factor; Based on the relationship between the target second parameter correction factor and the current speed of the fan, the reduced target speed is determined so as to control the fan to operate at the target speed.

5. The fan control method according to claim 1, characterized in that, Following the "determining the deviation coefficient", the following is also included: If the deviation coefficient is greater than the second deviation threshold, the fan is controlled to rotate in reverse for dust removal; If the deviation coefficient is determined to be less than the first deviation threshold, the fan is controlled to start with the initial starting current and the initial starting ramp time, or the fan is controlled to continue running at the current speed.

6. The fan control method according to claim 5, characterized in that, The phrase "controlling the fan to rotate in reverse for dust removal" includes: Based on the linear relationship between the deviation coefficient and the third parameter correction factor, the target third parameter correction factor is determined, wherein the deviation coefficient and the third parameter correction factor are positively correlated. Based on the relationship between the target third parameter correction factor and the dust removal speed threshold, the first dust removal speed is determined, and the fan is controlled to rotate in the opposite direction at the first dust removal speed for a first time threshold.

7. The fan control method according to claim 6, characterized in that, After "determining the first dust removal speed and controlling the fan to rotate in the opposite direction at the first dust removal speed for a first time threshold", the method further includes: Control the fan to rotate forward at the first dust removal speed and the second time threshold.

8. The control method for a fan according to any one of claims 1 to 7, characterized in that, The phrase "determining the total weight of dust deposited on the fan blades" includes: Determine the area ratio of the fan blade area to the area of ​​the sensor installed on the fan blade; The total weight of dust deposited on the fan blades is determined by multiplying the total weight of the first dust deposited on all sensors by the ratio of the area.

9. A control device for a fan, characterized in that, include: The first determining module is used to determine the total weight of dust deposited on the fan blades; The second determining module is used to determine the deviation coefficient based on the relationship between the total weight of dust and the initial weight of the fan blades; The control module is used to control the fan to increase the starting current and starting ramp time, or to control the running fan to reduce its speed, provided that the deviation coefficient is not less than the first deviation threshold and not greater than the second deviation threshold.

10. An air conditioner, characterized in that, Includes the control device for the fan as described in claim 9.

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