Dirty Blockage Detection Method, Air Conditioner and Readable Storage Medium of Air Conditioner

Abstract

The present invention discloses a method for detecting dirt blockage of an air conditioner, the method comprising: adjusting the rotational speed of the blower multiple times in ascending order; after each adjustment of the rotational speed of the blower, obtaining the actual operating power of the blower at the current rotational speed; determining a power change parameter according to the actual operating power and the reference operating power corresponding to the rotational speed; if the power change parameter is abnormal, determining that the air conditioner is dirt-blocked, and stopping adjusting the rotational speed of the blower. The present invention also provides an air conditioner and a readable storage medium. Based on the situation where the blower enters a stall, after each adjustment of the rotational speed of the blower, the actual operating power of the blower at the current rotational speed and the reference operating rotational speed corresponding to the current rotational speed are obtained, and when the power change parameter determined according to the actual operating power and the reference operating power is abnormal, it is determined that the operating power of the blower has mutated or dropped suddenly, and further it is determined that the air conditioner is dirt-blocked, thereby improving the accuracy of determining dirt blockage of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to a method for detecting dirt blockage of an air conditioner, an air conditioner and a readable storage medium. Background Art

[0002] During the operation of the air conditioner air duct, due to the existence of a large number of filter nets and heat exchanger structures, the resistance is relatively large. After working for a long time, due to reasons such as dust accumulation, the structure is blocked, which further affects the air supply volume and the working effect is poor. At present, the common method for judging dust and dirt blockage of an air conditioner is to calculate the cumulative working time of the air conditioner, and determine the dust accumulation situation of the air conditioner through the working time, and then judge whether the air conditioner needs to be dusted. However, since the working environments of air conditioners are different, the method for determining dirt blockage of an air conditioner by working time has low accuracy.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art Summary of the Invention

[0004] The present invention aims to provide a method for detecting dirt blockage of an air conditioner, an air conditioner and a storage medium, aiming to solve the problem that the method for determining dirt blockage of an air conditioner by working time has low accuracy due to the different working environments of air conditioners.

[0005] To achieve the above object, the present invention provides a method for detecting dirt blockage of an air conditioner, and the method for detecting dirt blockage of the air conditioner includes:

[0006] Adjust the speed of the fan multiple times in ascending order;

[0007] After each adjustment of the speed of the fan, obtain the actual operating power of the fan at the current speed;

[0008] Determine a power change parameter according to the actual operating power and the reference operating power corresponding to the speed, and the reference operating power includes the preset operating power corresponding to the speed or the actual operating power corresponding to the adjacent speed of the current speed;

[0009] If the power change parameter is abnormal, determine that the air conditioner is blocked by dirt and stop adjusting the speed of the fan.

[0010] Optionally, the step of adjusting the speed of the fan multiple times in ascending order includes:

[0011] Take the first speed as the initial speed and adjust the speed of the fan multiple times in ascending order.

[0012] Optionally, the method for detecting dirt blockage of an air conditioner further includes:

[0013] First, adjust the speed of the fan multiple times from small to large and record the first operating power at each speed;

[0014] Adjust the speed of the fan multiple times in a way from large to small;

[0015] After each adjustment of the speed of the fan, obtain the second operating power of the fan at the current speed;

[0016] Determine the power change parameter according to the currently detected second operating power and the first operating power corresponding to the current speed;

[0017] If the power change parameter is abnormal, determine the first speed according to the current speed;

[0018] Stop adjusting the speed of the fan.

[0019] Optionally, the step of determining the first speed according to the current speed includes:

[0020] Increase the actual operating power according to a preset adjustment value to increase the current speed to obtain the first speed.

[0021] Optionally, the dirty blockage detection method of the air conditioner further includes:

[0022] When receiving the start instruction of the air conditioner, execute the step of adjusting the speed of the fan multiple times in a way from small to large, and the reference operating power adopts the preset operating power corresponding to the speed; or,

[0023] When receiving the dirty blockage detection instruction of the air conditioner, execute the step of adjusting the speed of the fan multiple times in a way from small to large, and the reference operating power adopts the actual operating power corresponding to the adjacent speed of the current speed.

[0024] Optionally, after the step of determining that the air conditioner is dirty blocked if the power change parameter is abnormal, it includes:

[0025] Output a prompt message indicating that the air conditioner is dirty blocked.

[0026] Optionally, the dirty blockage detection method of the air conditioner further includes:

[0027] Obtain the current operating condition of the air conditioner;

[0028] When the operating condition is a non-heating condition, execute the step of adjusting the speed of the fan multiple times in a way from small to large.

[0029] Optionally, the dirty blockage detection method of the air conditioner further includes:

[0030] When the operating condition is the heating condition, the actual operating power of the blower is obtained in real time;

[0031] A second power change parameter is determined according to the actual operating power and the preset operating power corresponding to the current speed of the blower;

[0032] If the second power change parameter is abnormal, a prompt message indicating that the air conditioner is frosting and / or the air conditioner is controlled to enter the defrosting working mode is output.

[0033] In addition, to achieve the above object, the present invention further provides an air conditioner, which includes: a memory, a processor, and a dirty blockage detection program of the air conditioner stored in the memory and operable on the processor. When the dirty blockage detection program of the air conditioner is executed by the processor, each step of the dirty blockage detection method of the air conditioner as described above is implemented.

[0034] In addition, to achieve the above object, the present invention further provides a storage medium on which a dirty blockage detection program of the air conditioner is stored. When the dirty blockage detection program of the air conditioner is executed by the processor, each step of the dirty blockage detection method of the air conditioner as described above is implemented.

[0035] For the dirty blockage detection method of the air conditioner proposed by the present invention, in order to make the blower of the air conditioner enter the blower stall state, the speed of the blower is adjusted multiple times in ascending order. Based on the blower stall, when the resistance at the blower outlet gradually increases to a preset resistance during the operation of the blower, such as the case where the blower duct is congested due to dust accumulation. Compared with when the blower duct is not congested, after the blower duct is congested, at the same blower speed, the operating power of the blower drops suddenly.

[0036] Based on the situation where the blower enters the blower stall, after each adjustment of the blower speed, the actual operating power of the blower at the current speed is obtained, as well as the reference operating speed corresponding to the current speed, such as the preset operating power corresponding to the speed or the actual operating power corresponding to the adjacent speed of the current speed. According to the power change parameter determined by the actual operating power and the reference operating power, it is determined whether the operating power of the blower has a sudden change or a sudden drop. By determining that the power change parameter is abnormal, it is determined that the operating power of the blower has a sudden change or a sudden drop, and then it is determined that the air conditioner is dirty blocked, improving the accuracy of determining the dirty blockage of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the terminal structure of the hardware operating environment related to each embodiment of the dirty blockage detection method of the air conditioner of the present invention;

[0038] Figure 2 It is a schematic flowchart of the first embodiment of the dirty blockage detection method of the air conditioner of the present invention;

[0039] Figure 3 It is a flow contrast diagram near the fan when the fan of the dirty blockage detection method of the air conditioner of the present invention is operating normally and when it is stalled;

[0040] Figure 4 It is the fan performance curve;

[0041] Figure 5 It is the air volume / power change diagram of the stable-state fan as the resistance increases;

[0042] Figure 6 It is a schematic flow chart of adjusting the fan speed with the first speed as the initial speed in the first embodiment of the dirty blockage detection method of the air conditioner of the present invention;

[0043] Figure 7 It is a schematic flow chart of the second embodiment of the dirty blockage detection method of the air conditioner of the present invention;

[0044] Figure 8 It is a power change comparison diagram of two speed regulation methods;

[0045] Figure 9 It is a schematic flow chart of the fourth embodiment of the dirty blockage detection method of the air conditioner of the present invention.

[0046] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0047] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0048] The dirty blockage detection method of the air conditioner of the present invention includes: adjusting the speed of the fan multiple times in ascending order; after each adjustment of the speed of the fan, obtaining the actual operating power of the fan at the current speed; determining a power change parameter according to the actual operating power and the reference operating power corresponding to the speed, where the reference operating power includes the preset operating power corresponding to the speed or the actual operating power corresponding to the adjacent speed of the current speed; if the power change parameter is abnormal, determining that the air conditioner is dirty blocked and stopping adjusting the speed of the fan.

[0049] To make the blower of the air conditioner enter the blower stall state, the speed of the blower is adjusted multiple times in ascending order. Based on the blower stall, when the resistance at the blower outlet gradually increases to a preset resistance during the operation of the blower, such as when the blower duct is congested due to dust accumulation, compared with when the blower duct is not congested, after the blower duct becomes congested, the operating power of the blower drops suddenly. In the technical solution disclosed in this embodiment, based on the situation where the blower enters the blower stall, after each adjustment of the blower speed, the actual operating power of the blower at the current speed is obtained, as well as the reference operating speed corresponding to the current speed, such as the preset operating power corresponding to the speed or the actual operating power corresponding to the adjacent speed of the current speed. According to the power change parameter determined by the actual operating power and the reference operating power, it is determined whether the operating power of the blower has a sudden change or a sudden drop. By determining that the power change parameter is abnormal, it is determined that the operating power of the blower has a sudden change or a sudden drop, and then it is determined that the air conditioner is dirty blocked, improving the accuracy of determining the dirty blockage of the air conditioner.

[0050] Please refer to Figure 1 , Figure 1 which is a schematic diagram of the terminal structure of the hardware operating environment involved in each embodiment of the dirty blockage detection method of the air conditioner of the present invention.

[0051] The execution subject of the embodiment of the dirty blockage detection method of the air conditioner of the present invention can be an air conditioner.

[0052] As Figure 1 shown, the air conditioner may include: a processor 101, a communication bus 102, and a memory 103. Those skilled in the art can understand that Figure 1 the shown block diagram of the air conditioner structure does not limit the terminal. The terminal may include more or fewer components than shown, or combine some components, or have different component arrangements. Among them, the processor 101 is the dirty blockage detection center of the air conditioner, the communication bus 102 is used to realize the connection and communication between the various components of the air conditioner, and the memory 103 stores a central control system and a dirty blockage detection program for the air conditioner. The processor 101 executes the dirty blockage detection program stored in the memory 103 to implement the steps of each embodiment of the dirty blockage detection method of the air conditioner of the present invention.

[0053] Based on the above block diagram of the air conditioner structure, various embodiments of the dirty blockage detection method of the air conditioner of the present invention are proposed.

[0054] The present invention provides a dirty blockage detection method for an air conditioner. Please refer to Figure 2 , Figure 2 which is a schematic flowchart of the first embodiment of the dirty blockage detection method of the air conditioner of the present invention. In this embodiment, the dirty blockage detection method of the air conditioner includes the following steps:

[0055] Step S10, adjust the speed of the fan multiple times in ascending order;

[0056] In the actual application process, it should be noted that in the actual application process, the stall state of the fan means that during normal operation, the air flow adheres to the vicinity of the fan blades and maintains a streamline state. The pressure of the fan increases as the flow rate of the fan decreases. As the flow rate of the fan gradually decreases, the fan pressure reaches the maximum. However, when the flow rate of the fan further decreases, due to the increase in the inlet air flow or the outlet resistance, the air flow near the fan blades cannot maintain a continuous flow state, and flow separation starts from the back of the fan blades, the boundary layer is damaged, and an eddy current area appears. In this case, the speed of the fan remains unchanged, but the outlet air flow and the flow rate of the fan drop suddenly, and at the same time, the operating current of the fan motor also suddenly decreases.

[0057] Please refer to Figure 3 , Figure 3 is a flow comparison diagram near the fan when the air conditioner's fan of the present invention is operating normally and in a stall state. Among them, the left side is the normal operating state of the fan, and the air flow near the fan blades is well filled and streamlined; the right side is the stall operating state of the fan. Due to the increase in the inlet or outlet resistance, or the decrease in the motor speed, the air flow near the fan blades becomes less, and vortices appear on the back of the fan blades.

[0058] In order to get rid of the stall state, after the fan enters the stall state, a stable vortex is formed near the blades. By supplementing the air flow or increasing the speed of the fan, the air pressure can be increased and more air flow can be inhaled to make the fan get rid of the stall state.

[0059] Based on the above analysis, it should be noted that in order to make the fan of the air conditioner enter the fan stall state, the speed of the fan is adjusted multiple times in ascending order, that is, from low to high, so that when the fan is in a stall state, when the fan is running and the resistance at the fan outlet gradually increases to a preset resistance, such as when the fan duct is blocked due to dust accumulation, etc., compared with when the fan duct is not blocked, after the fan duct is blocked, at the same fan speed, the operating power of the fan drops suddenly.

[0060] Please refer to Figure 4 , Figure 4 is the fan performance curve. Among them, the left side of point B in the figure is the stall interval of the fan, and the flow state near the blades is uncontrollable, and there is no stable relationship between the air volume and the air pressure; the right side of point B is the normal designed working interval, and the air pressure in the normal working interval decreases as the air volume increases. The present invention uses the characteristics of the stall on the left side of point B to determine the dirt blockage of the air conditioner. Further, please refer to Figure 5 , Figure 5It is a graph showing the change of air volume / power of a steady-state fan as the resistance increases. Among them, the air volume curve is at the upper part of the graph, and the power curve is at the lower part. The change trends of the air volume and power are the same. Here, the power is taken as an example for introduction. Under ideal conditions, if there is no fan stall, as the resistance increases, the power curve drops to a smooth curve. However, in the actual working process, due to the existence of fan stall, when the resistance increases to a certain extent, the power will drop suddenly, that is, it drops suddenly from EC shown in the figure to the position of EC' shown in the figure. Further, the power difference between P1 and P1' is used to determine the dirty blockage. Optionally, the initial speed of the motor controlling the fan speed can be reduced, such as adjusting the fan speed multiple times in ascending order based on the initial speed, so that the fan can more easily enter EC'.

[0061] To make the fan of the air conditioner enter the fan stall state, the fan speed is adjusted multiple times in ascending order. After each adjustment of the fan speed, the fan speed can be increased according to a preset speed adjustment value to update the fan speed, so that the fan operates at the updated speed after each adjustment of the fan speed, realizing multiple adjustments of the fan speed in ascending order. Among them, the preset speed adjustment value can be set in advance. For example, the preset speed adjustment value is 100r / s. If the fan speed is 1000r / s, the fan speed is increased according to the preset speed adjustment value to update the fan speed, so as to obtain the updated speed of 1100r / s; alternatively, the fan speed can be adjusted in turn according to the speed array containing the fan speeds from low to high, realizing multiple adjustments of the fan speed in ascending order. This embodiment does not make specific limitations on this step.

[0062] Optionally, the way of adjusting the fan speed multiple times can be to adjust the fan speed at preset time intervals.

[0063] Step S20, after each adjustment of the fan speed, obtain the actual operating power of the fan at the current speed;

[0064] At the current speed, the actual operating power of the fan can be obtained based on the corresponding relationship between the speed and the operating power. Based on this corresponding relationship, when the current speed of the fan is obtained, the actual operating power corresponding to the current speed is obtained. It can be understood that the corresponding relationship between the speed and the operating power can be a calculation formula for determining the operating power of the fan according to the fan speed, or can be determined based on a corresponding table between the speed and the operating power.

[0065] Step S30: Determine a power change parameter based on the actual operating power and the reference operating power corresponding to the rotational speed. The reference operating power includes the preset operating power corresponding to the rotational speed or the actual operating power corresponding to an adjacent rotational speed of the current rotational speed.

[0066] Step S40: If the power change parameter is abnormal, determine that the air conditioner is dirty-blocked and stop adjusting the rotational speed of the fan.

[0067] The reference operating power includes the preset operating power corresponding to the rotational speed or the actual operating power corresponding to an adjacent rotational speed of the current rotational speed.

[0068] It should be noted that when the fan stalls, as the resistance at the fan outlet gradually increases to a preset resistance during the operation of the fan, such as when the fan duct is congested due to dust accumulation, etc., compared with when the fan duct is not congested, after the fan duct becomes congested, at the same fan rotational speed, the operating power of the fan drops suddenly. Based on this, when the reference operating power is the preset operating power corresponding to the rotational speed, that is, the preset operating power of the current rotational speed, the preset operating power refers to the operating power obtained based on a rotational speed such as the current rotational speed when the air conditioner is not dirty-blocked.

[0069] It should be noted that when the fan stalls, the rotational speed of the fan is adjusted multiple times in a manner from low to high. When the air conditioner is not dirty-blocked, such as when the fan duct is not congested, the actual operating power of the rotational speed of the fan adjusted each time is detected in sequence, and the actual operating power shows regularity such as continuous change. If there is a sudden change in the actual operating power, it indicates that the air conditioner is dirty-blocked, such as when the fan duct is congested. Based on this, when the reference operating power is the actual operating power corresponding to an adjacent rotational speed of the current rotational speed, the actual operating power corresponding to an adjacent rotational speed refers to the actual operating power corresponding to the rotational speed before the adjustment of the current rotational speed, that is, the previous rotational speed of the fan, or the actual operating power corresponding to the rotational speed after the adjustment of the current rotational speed, that is, the next rotational speed of the fan. For example, the rotational speed of the fan is adjusted in sequence as R1, R2, and R3 in a manner from low to high, where the rotational speed R1 is less than the rotational speed R2, and the rotational speed R2 is less than the rotational speed R3. When the current rotational speed is R2, the actual operating power corresponding to an adjacent rotational speed of the current rotational speed refers to the actual operating power corresponding to R1 or the actual operating power corresponding to R3.

[0070] The power change parameter is a parameter used to determine whether the operating power of the fan drops suddenly or changes abruptly at the same rotational speed of the fan. The power change parameter is determined based on the actual operating power and the reference operating power corresponding to the rotational speed. The ratio of the actual operating power to the reference operating power can be obtained as the power change parameter; alternatively, the difference between the actual operating power and the reference operating power can be obtained as the power change parameter, and there is no limitation on this.

[0071] Optionally, the power change parameter is determined based on the ratio of the obtained actual operating power to the reference operating power. It can be understood that when the power change parameter is greater than or equal to the preset power change parameter, it indicates that the power change parameter is abnormal, that is, at the same rotational speed of the fan, the operating power of the fan drops suddenly or changes abruptly, and it can be determined that the air conditioner is dirty blocked. For example, if there is congestion in the air duct of the fan, the user can be prompted to check whether the filter screen and / or heat exchanger of the air conditioner are too dusty.

[0072] Optionally, when the power change parameter is abnormal in step S40, after determining that the air conditioner is dirty blocked, it includes: outputting a prompt message indicating that the air conditioner is dirty blocked to prompt the user that the air conditioner is dirty blocked, and further prompting the user to check whether the filter screen and / or heat exchanger of the air conditioner are too dusty.

[0073] It is easy to understand that when the power change parameter is less than the preset power change parameter, it indicates that the power change parameter is normal and the air conditioner is not dirty blocked.

[0074] In this embodiment, the rotational speed of the fan is adjusted multiple times in a manner from low to high. After each adjustment of the rotational speed of the fan, based on the adjusted rotational speed, as long as the power change parameter is abnormal, it can be determined that the air conditioner is dirty blocked, and when it is determined that the air conditioner is dirty blocked, the adjustment of the rotational speed of the fan can be stopped.

[0075] As an alternative implementation, please refer to Figure 6 , Figure 6 is a schematic flowchart of adjusting the rotational speed of the fan with the first rotational speed as the initial rotational speed in the first embodiment of the dirty block detection method for the air conditioner of the present invention. Step S10 includes:

[0076] Step S11, taking the first rotational speed as the initial rotational speed, adjusting the rotational speed of the fan multiple times in a manner from small to large.

[0077] The initial speed, i.e., the first speed, is less than the minimum limit speed of the fan. Here, the minimum limit speed of the fan is the minimum speed at which the fan operates when the air conditioner leaves the factory, such as the speed corresponding to the lowest wind speed setting of the fan. In actual application, due to the factory design, the fan speed range at which the fan operates generally stays away from the stall area of the fan, that is, any speed within the fan speed range does not belong to the speeds in the stall area of the fan. It is easy to understand that usually, when the fan operates at the minimum speed of the fan operation, the fan will not enter the fan stall state. To ensure that the fan can enter the fan stall state, the initial speed, i.e., the first speed, is set to be less than or equal to the minimum limit speed of the fan, which can make the fan enter the fan stall state.

[0078] In this embodiment, by using the electronic control program, based on the working state of the fan, rapid determination of dirt blockage can be achieved only from the power data, without the need to add additional components or sensors, and without the need to extract other data such as temperature. It is applicable to various categories such as the indoor unit, outdoor unit, and integrated unit of the air conditioner, and various working conditions such as refrigeration, heating, and ventilation. It has a wide range, high accuracy, low cost, can achieve effective dirt blockage determination, and improve the user experience and product usability.

[0079] To make the fan of the air conditioner enter the fan stall state, the speed of the fan is adjusted multiple times in ascending order. Based on when the fan stalls, when the resistance at the fan outlet gradually increases to a preset resistance during the operation of the fan, such as when the fan duct is congested due to dust accumulation, compared with when the fan duct is not congested, after the fan duct becomes congested, at the same fan speed, the operating power of the fan drops suddenly.

[0080] In the technical solution disclosed in this embodiment, based on the situation where the fan enters the fan stall, after each adjustment of the fan speed, the actual operating power of the fan at the current speed is obtained, as well as the reference operating speed corresponding to the current speed, such as the preset operating power corresponding to the speed or the actual operating power corresponding to the adjacent speed of the current speed. Based on the power change parameter determined by the actual operating power and the reference operating power, it is determined whether the operating power of the fan has a sudden change or a sudden drop. By determining that the power change parameter is abnormal, it is determined that the operating power of the fan has a sudden change or a sudden drop, and then it is determined that the air conditioner is dirty blocked, improving the accuracy of determining the dirt blockage of the air conditioner.

[0081] Please refer to the second embodiment of the dirt blockage detection method for the air conditioner of the present invention proposed based on the above first embodiment. Figure 7 , Figure 7 is a schematic flowchart of the second embodiment of the dirt blockage detection method for the air conditioner of the present invention. In this embodiment, the dirt blockage detection method for the air conditioner further includes:

[0082] Step S50: Adjust the rotational speed of the fan multiple times from low to high and record the first operating power at each rotational speed.

[0083] Step S60: Adjust the rotational speed of the fan multiple times in a way from high to low.

[0084] Step S70: After adjusting the rotational speed of the fan each time, obtain the second operating power of the fan at the current rotational speed.

[0085] Step S80: Determine the power change parameter according to the currently detected second operating power and the first operating power corresponding to the current rotational speed.

[0086] Step S90: If the power change parameter is abnormal, determine the first rotational speed according to the current rotational speed.

[0087] Step S100: Stop adjusting the rotational speed of the fan.

[0088] It should be noted that, please refer to Figure 8 , Figure 8 which is the power change comparison chart of two rotational speed control methods. Among them, nc is the critical rotational speed. For the same motor that controls the rotational speed of the fan, when the motor rotational speed increases from low to high, the fan first enters the fan stall state, with lower air volume and operating power. As the rotational speed of the fan gradually increases, the air volume and operating power reach normal; while when the motor rotational speed decreases from high to low, the fan is in a normal working state, and the area near the fan blades is normal when the rotational speed decreases, so the power curve and the rotational speed curve are close to linear change. Based on this, adjust the rotational speed of the fan multiple times in a way from low to high first and then from high to low, that is, the rotational speed sweep of the fan in two ways: from top to bottom and from bottom to top, so as to determine the critical rotational speed of the fan duct of the air conditioner when it is not blocked. When making subsequent judgments, use the critical rotational speed as the key rotational speed. When there is a blockage in the fan duct, the stall interval increases, and the critical rotational speed of the air conditioner after it gets dirty is greater than the critical rotational speed of the air conditioner when it is not dirty. When the fan duct is normal, that is, there is no blockage in the duct, the critical rotational speed is the same as the critical rotational speed of the air conditioner when it is not dirty.

[0089] It also should be noted that, continue to refer to Figure 8, the rotational speed of the fan is greater than or equal to the critical speed nc, and the fan operates stably; when the rotational speed of the fan is less than the critical speed, the fan operates unstably. When the air conditioner is clogged, the compressive resistance of the entire fan deteriorates. After the air conditioner is clogged, the critical speed nc' > the critical speed nc when the air conditioner is not clogged. It can be understood that after the air conditioner is clogged, stalling originally occurred at the critical value nc, and now stalling will also occur at the critical speed nc' after clogging. By using the power change in this section between nc and nc', that is, based on the interval from nc to nc', when the air conditioner is not clogged, the operating power of the fan is normal, but after the air conditioner is clogged, stalling occurs from nc to nc', and the power drops, so as to realize the determination of air conditioner clogging.

[0090] Please continue to refer to Figure 8 , at the same fan rotational speed, when sweeping the rotational speed of the fan in a top-down manner, the fan operates normally and the obtained operating power is normal; when sweeping the rotational speed of the fan in a bottom-up manner, the fan enters the fan stall state and the first operating power will drop suddenly.

[0091] In this embodiment, the rotational speed of the fan is adjusted multiple times in the order of first from small to large and then from large to small. It can be based on a pre-set rotational speed array that includes the rotational speeds of the fan from low to high. The rotational speed of the fan in the rotational speed array is adjusted from small to large in sequence to realize multiple adjustments of the rotational speed of the fan in a manner from low to high; then, the rotational speed of the fan in the rotational speed array is adjusted from large to small in sequence to realize multiple adjustments of the rotational speed of the fan in a manner from high to low.

[0092] Optionally, the lower the rotational speed of the fan, the easier it is for the fan to stall. The minimum rotational speed in the rotational speed array can be 0, or any rotational speed between 30% and 70% of the minimum limit rotational speed of the fan; the maximum rotational speed in the rotational speed array is the minimum limit rotational speed of the fan.

[0093] It should be noted that the rotational speed of the fan is adjusted multiple times from small to large, and the first operating power at each rotational speed is recorded. Then, the rotational speed of the fan is adjusted multiple times from small to large; after each adjustment of the rotational speed of the fan, the second operating power of the fan at the current rotational speed is obtained, and the power change parameter is determined based on the currently detected second operating power and the first operating power corresponding to the current rotational speed. Essentially, the power change parameter is obtained by taking the ratio of the second operating power when the rotational speed of the fan is adjusted from large to small to the first operating power when the rotational speed of the fan is adjusted from small to large at the same rotational speed. When the power change parameter is abnormal, that is, when the operating power of the air conditioner suddenly changes, the critical rotational speed is determined based on the rotational speed corresponding to the sudden change in the operating power of the air conditioner, and then the initial rotational speed, that is, the first rotational speed, is determined based on the critical rotational speed.

[0094] In this embodiment, by means of two rotational speed sweeping methods from top to bottom and from bottom to top, the critical rotational speed at which stall occurs is accurately obtained, and this critical rotational speed is used for judging the dirt blockage of the air conditioner. For example, in step S10, the rotational speed of the fan can be adjusted multiple times from small to large based on the critical rotational speed as the initial rotational speed, instead of adjusting the rotational speed of the fan multiple times from small to large starting from 0 at the initial rotational speed of the fan, which improves the judging efficiency of whether the air conditioner is dirt blocked.

[0095] Optionally, determining the first rotational speed according to the current rotational speed in step S90 includes:

[0096] Increasing the actual operating power by a preset adjustment value to increase the current rotational speed to obtain the first rotational speed.

[0097] Increasing the actual operating power by a preset adjustment value to increase the current rotational speed to obtain the first rotational speed. Compared with the foregoing method of determining the first rotational speed according to the critical rotational speed, the first rotational speed obtained by increasing the actual operating power by a preset adjustment value to increase the current rotational speed is greater than the critical rotational speed, that is, by increasing the initial rotational speed, it can be used to determine the dirt blockage degree of the air conditioner. It should be noted that the first rotational speed adopts the critical rotational speed, and after the first rotational speed is increased, a greater resistance is required for the fan to stall, and a greater dirt blockage of the air conditioner will cause a sudden drop in power.

[0098] Optionally, the preset adjustment value can be set in advance according to user requirements or based on empirical values.

[0099] In the technical solution disclosed in this embodiment, by means of two rotational speed sweeping methods from top to bottom and from bottom to top, the critical rotational speed corresponding to the occurrence of stall is accurately obtained, the initial rotational speed, that is, the first rotational speed, is determined according to the critical rotational speed, and the critical rotational speed is used for judging the dirt blockage of the air conditioner, without adjusting the rotational speed of the fan multiple times from small to large starting from 0 at the initial rotational speed of the fan, which speeds up the judging efficiency of whether the air conditioner is dirt blocked.

[0100] The third embodiment of the dirty blockage detection method for the air conditioner of the present invention proposed based on any of the above embodiments. In this embodiment, the dirty blockage detection method for the air conditioner further includes:

[0101] When receiving the start instruction of the air conditioner, execute step S10, and the reference operating power adopts the preset operating power corresponding to the rotation speed; or,

[0102] When receiving the dirty blockage detection instruction of the air conditioner, execute step S10, and the reference operating power adopts the actual operating power corresponding to the adjacent rotation speed of the current rotation speed.

[0103] It should be noted that based on the situation of fan stall, when the resistance at the fan outlet gradually increases to a preset resistance during the operation of the fan, such as when the fan air duct is congested due to dust accumulation, etc., compared with when the fan air duct is not congested, after the fan air duct is congested, at the same fan rotation speed, the operating power of the fan drops suddenly.

[0104] In the actual application process, due to the factory design, the rotation speed range of the fan generally stays away from the stall area, making it difficult to detect early-stage dirty blockages. Therefore, before the air conditioner enters normal operation such as heating operation and cooling operation, the air conditioner first executes steps S10 - S40 during startup to determine whether the air conditioner is dirty blocked. If the power change parameter is normal, there is no dirty blockage in the air conditioner. If the power change parameter is abnormal, it is determined that the air conditioner is dirty blocked and needs to be cleaned. Therefore, to detect the dirty blockage of the air conditioner earlier, when receiving the startup instruction of the air conditioner, step S10 can be executed, and the reference operating power adopts the preset operating power corresponding to the current rotation speed.

[0105] Optionally, when the reference operating power adopts the preset operating power corresponding to the current rotation speed, the initial rotation speed of the fan, i.e., the first rotation speed, adopts the critical rotation speed, and the rotation speed of the fan is adjusted multiple times in ascending order starting from the first rotation speed, and the rotation speed of the fan after each adjustment is less than or equal to the minimum limit rotation speed.

[0106] It should be noted that the method of receiving the start instruction of the air conditioner, adopting the preset operating power corresponding to the current rotation speed, and executing steps S10 - S40 to determine the dirty blockage of the air conditioner is applicable to self-checking the dirty blockage of the air conditioner when the air conditioner is turned on during normal operation of the air conditioner and during the normal operation process of the air conditioner.

[0107] In the actual application process, when the fan stalls, the speed of the fan is adjusted multiple times in a manner from low to high. When the air conditioner is not clogged, such as when the air duct of the fan is not congested, the actual operating power of the fan speed for each adjustment is detected in sequence. The actual operating power shows regularity, such as continuous change. The greater the operating speed of the fan, the greater the actual operating power of the fan. If there is a sudden change in the actual operating power, it indicates that the air conditioner is clogged, such as the air duct of the fan is congested.

[0108] In addition, it should be noted that in the second embodiment, the speed of the fan is adjusted multiple times in a manner from small to large and then from large to small, that is, the speed sweep of the fan in two ways: from top to bottom and from bottom to top, so as to determine the critical speed of the fan air duct when the air conditioner is not clogged. When making subsequent judgments, the critical speed is used as the key speed. When there is a blockage in the air duct of the fan, the stall interval increases, and the critical speed of the air conditioner after being clogged is greater than the critical speed when the air conditioner is not clogged. When the air duct of the fan is normal, that is, there is no blockage, the critical speed is the same as the critical speed when the air conditioner is not clogged. Therefore, subsequently, the operating power sweep is taken at a speed greater than the critical speed when the air conditioner is not clogged to observe the power continuity to determine whether the air conditioner is clogged.

[0109] Optionally, when the reference operating power is the actual operating power corresponding to the adjacent speed of the current speed, the initial speed of the fan, that is, the first speed, is a speed greater than the critical speed, such as taking a value of 110% of the critical speed. Starting from the first speed as the initial speed, the speed of the fan is adjusted multiple times in a manner from small to large, and the speed of the fan after each adjustment is less than or equal to the minimum limit speed, such as 110% of the minimum limit speed. It should be noted that the initial speed of the fan, that is, the first speed, can also be the critical speed.

[0110] It should be noted that when receiving the dirty blockage detection instruction of the air conditioner, the reference operating power adopts the actual operating power corresponding to the adjacent speed of the current speed, and the method of executing steps S10 - S40 to determine the dirty blockage of the air conditioner is applicable to the operating logic when the user can selectively set the dirty blockage mode detection to more systematically detect the dirty blockage situation of the air conditioner.

[0111] In the technical solution disclosed in this embodiment, when receiving the start instruction of the air conditioner, steps S10 - S40 are executed to realize the automatic detection of the dirty blockage situation of the air conditioner, detect the dirty blockage of the air conditioner early to ensure the normal operation of the air conditioner; when receiving the dirty blockage detection instruction of the air conditioner, steps S10 - S40 are executed to facilitate the user to selectively detect the dirty blockage situation of the air conditioner and facilitate the user to know whether the air conditioner is clogged.

[0112] A fourth embodiment of the dirty blockage detection method for the air conditioner according to the present invention is proposed based on any one of the above embodiments. Please refer to Figure 9 , Figure 9 which is a schematic flowchart of the fourth embodiment of the dirty blockage detection method for the air conditioner according to the present invention. In this embodiment, the dirty blockage detection method for the air conditioner further includes:

[0113] Step S110, obtaining the current operating condition of the air conditioner;

[0114] Step S120, when the operating condition is a non-heating condition, execute Step S10.

[0115] The current operating condition of the air conditioner can be determined by obtaining and determining the current working mode of the air conditioner, such as the cooling mode or the heating mode.

[0116] As an optional implementation manner, after Step S110 includes:

[0117] When the operating condition is a heating condition, obtaining the current actual operating power of the blower in real time;

[0118] Determining a second power change parameter according to the actual operating power and the preset operating power corresponding to the current speed of the blower;

[0119] If the second power change parameter is abnormal, output a prompt message indicating that the air conditioner is frosting and / or control the air conditioner to enter the defrosting working mode.

[0120] In the case of frosting on the outdoor unit in the heating condition, when the blower is running, directly based on the comparison between the preset operating power corresponding to the running speed of the blower and the actual operating power at this running speed. When frosting occurs, the resistance increases, the blower enters the blower stall state, and the operating power of the blower drops suddenly to determine the frosting condition of the air conditioner.

[0121] The power change parameter is a parameter used to determine whether the operating power of the blower drops suddenly or changes suddenly at the same speed of the blower. The second power change parameter is determined according to the ratio of the actual operating power and the preset operating power corresponding to the current speed of the blower. When the second power change parameter is abnormal, that is, when the second power change parameter is greater than or equal to the preset power change parameter, that is, at the same speed of the blower, the operating power of the blower drops suddenly or changes suddenly, it can be determined that the air conditioner is frosting, output a prompt message indicating that the air conditioner is frosting to prompt the user that the air conditioner is about to enter the defrosting working mode for defrosting, and / or control the air conditioner to enter the defrosting working mode for defrosting operation to ensure the normal operation of the air conditioner.

[0122] Optionally, in combination with the third embodiment, when receiving the start instruction of the air conditioner, steps S10 to S40 are executed to self-check whether the air conditioner is clogged. When the power change parameter is normal, the air conditioner is controlled for normal control such as refrigeration or heating.

[0123] In the technical solution disclosed in this embodiment, when it is determined that the current operating condition of the air conditioner is a non-heating condition, steps S10 to S40 are executed to avoid misjudging the congestion caused by frosting in the heating condition as the air conditioner being clogged; and when the operating condition of the air conditioner is a heating condition, by obtaining the current actual operating power of the blower in real time and the preset operating power corresponding to the current rotational speed, it is determined that the second power change parameter determined according to the actual operating power and the preset operating power is abnormal to determine that the air conditioner is frosting. By outputting a prompt message indicating that the air conditioner is frosting to prompt the user, and / or controlling the air conditioner to enter the defrosting working mode to defrost, the abnormal operation of the air conditioner is avoided.

[0124] The present invention also provides an air conditioner, which includes: a memory, a processor, and a dirty blockage detection program of the air conditioner stored in the memory and executable on the processor. When the dirty blockage detection program of the air conditioner is executed by the processor, the steps of the dirty blockage detection method of the air conditioner in any of the above embodiments are implemented.

[0125] The present invention also provides a storage medium, on which a dirty blockage detection program of the air conditioner is stored. When the dirty blockage detection program of the air conditioner is executed by the processor, the steps of the dirty blockage detection method of the air conditioner as described in any of the above embodiments are implemented.

[0126] In the embodiments of the terminal device and the readable storage medium provided by the present invention, all the technical features of the embodiments of the above-mentioned dirty blockage detection method of the air conditioner are included. The expansion and explanation content of the specification are basically the same as those of the embodiments of the above-mentioned dirty blockage detection method of the air conditioner, and will not be repeated here.

[0127] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A method for detecting dirt blockage of an air conditioner, characterized in that, the method for detecting dirt blockage of the air conditioner includes: Adjusting the rotational speed of the fan multiple times in ascending order; After each adjustment of the rotational speed of the fan, obtaining the actual operating power of the fan at the current rotational speed; Determining a power change parameter according to the actual operating power and the reference operating power corresponding to the rotational speed, where the reference operating power includes the preset operating power corresponding to the rotational speed or the actual operating power corresponding to the adjacent rotational speed of the current rotational speed; If the power change parameter is abnormal, determining that the air conditioner is dirt-blocked and stopping adjusting the rotational speed of the fan.

2. The method for detecting dirt blockage of an air conditioner according to claim 1, characterized in that, the step of adjusting the rotational speed of the fan multiple times in ascending order includes: Adjusting the rotational speed of the fan multiple times in ascending order with the first rotational speed as the initial rotational speed.

3. The method for detecting dirt blockage of an air conditioner according to claim 2, characterized in that, the method for detecting dirt blockage of the air conditioner further includes: First, adjusting the rotational speed of the fan multiple times in ascending order and recording the first operating power at each rotational speed; Adjusting the rotational speed of the fan multiple times in descending order; After each adjustment of the rotational speed of the fan, obtaining the second operating power of the fan at the current rotational speed; Determining a power change parameter according to the currently detected second operating power and the first operating power corresponding to the current rotational speed; If the power change parameter is abnormal, determining the first rotational speed according to the current rotational speed; Stopping adjusting the rotational speed of the fan.

4. The method for detecting dirt blockage of an air conditioner according to claim 3, characterized in that, the step of determining the first rotational speed according to the current rotational speed includes: Increasing the actual operating power by a preset adjustment value to increase the current rotational speed to obtain the first rotational speed.

5. The method for detecting dirt blockage of an air conditioner according to claim 1, characterized in that, the method for detecting dirt blockage of the air conditioner further includes: When receiving the start instruction of the air conditioner, executing the step of adjusting the rotational speed of the fan multiple times in ascending order, and using the preset operating power corresponding to the rotational speed as the reference operating power; or, When receiving the dirt blockage detection instruction of the air conditioner, executing the step of adjusting the rotational speed of the fan multiple times in ascending order, and using the actual operating power corresponding to the adjacent rotational speed of the current rotational speed as the reference operating power.

6. The method for detecting dirt blockage of an air conditioner according to claim 1, characterized in that, after the step of determining that the air conditioner is dirt-blocked if the power change parameter is abnormal, it includes: Outputting a prompt message indicating that the air conditioner is dirt-blocked.

7. The method for detecting dirt blockage of an air conditioner according to claim 1, characterized in that, the method for detecting dirt blockage of the air conditioner further includes: Obtaining the current operating condition of the air conditioner; When the operating condition is a non-heating condition, executing the step of adjusting the rotational speed of the fan multiple times in ascending order.

8. The method for detecting dirt blockage of an air conditioner according to claim 7, characterized in that, The dirty blockage detection method of the air conditioner further includes: When the working condition is the heating working condition, the actual operating power of the current blower is obtained in real time; A second power change parameter is determined according to the actual operating power and the preset operating power corresponding to the current speed of the blower; If the second power change parameter is abnormal, a prompt message for the air conditioner to frost and / or control the air conditioner to enter the defrosting working mode is output.

9. An air conditioner, characterized in that, The air conditioner includes: a memory, a processor, and a dirty blockage detection program of the air conditioner stored in the memory and operable on the processor. When the dirty blockage detection program of the air conditioner is executed by the processor, the steps of the dirty blockage detection method of the air conditioner according to any one of claims 1-8 are implemented.

10. A computer-readable storage medium, characterized in that, A dirty blockage detection program of the air conditioner is stored on the computer-readable storage medium. When the dirty blockage detection program of the air conditioner is executed by a processor, the steps of the dirty blockage detection method of the air conditioner according to any one of claims 1-8 are implemented.

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