Air conditioner

Abstract

The invention discloses an air conditioner which comprises an outdoor fan and a compressor. The outdoor fan and the compressor are connected through a common bus; the load sampler and the current sampler are respectively connected with the controller; the load sampler and the current sampler are correspondingly connected with the compressor and the outdoor fan respectively, and are used for collecting the operation load of the compressor and the operation current of the outdoor fan and transmitting the operation load and the operation current to the controller; the outdoor fan is connected with the controller; the controller performs operation control on the outdoor fan according to the operation current; according to the operation load of the compressor and the set rotating speed of the outdoor fan, the same or different sampling strategies are selected for sampling of the operation current every time; the sampling rate of each control period in different sampling strategies is different. According to the method, the problem of out-of-step of the outdoor fan caused by inaccurate sampling is solved, and the accuracy and reliability of outdoor fan control are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and particularly to an air conditioner. Background Art

[0002] Permanent Magnet Synchronous Machines (PMSMs) have the characteristics of small volume, high reliability, high torque inertia ratio, high efficiency, and high power density, and are widely used in civil, military, aviation and other fields. The high-performance control of PMSMs depends on accurate rotor position information and the accuracy of sampled feedback current. However, mechanical sensors are vulnerable to the environment and increase the volume and cost of the motor. Therefore, sensorless technology has become a research hotspot.

[0003] The outdoor fan of the air conditioner uses a permanent magnet synchronous motor and adopts a classical double closed-loop control strategy. The position information is selected by a position observer. When the outdoor fan is operating at low speed and heavy load, the resistance sampling is often inaccurate, resulting in the loss of synchronization of the fan control. In addition, when the outdoor fan and the compressor are connected by a common bus voltage, the operating state of the compressor has a significant impact on the control of the outdoor fan. Especially when the compressor is operating at heavy load, the resistance sampling is inaccurate, which further leads to the loss of synchronization of the fan control.

[0004] The above information disclosed in this background art is only used to increase the understanding of the background art of the present application. Therefore, it may include prior art that is not known to those of ordinary skill in the art. Summary of the Invention

[0005] Aiming at the problem of inaccurate resistance sampling that occurs when the outdoor fan has a low rotation speed when the bus circuit has a high load in the background art, the present invention proposes an air conditioner that adopts a sampling strategy with different sampling rates for different operating loads and set rotation speeds to improve the accuracy of resistance sampling, thereby solving the loss of synchronization of the outdoor fan control and improving the operating reliability of the outdoor fan.

[0006] To achieve the above invention purpose, the present invention adopts the following technical solutions: An air conditioner, comprising: an outdoor fan and a compressor; the outdoor fan and the compressor are connected by a common bus; It further includes a controller and a load sampler and a current sampler respectively connected to the controller; the load sampler and the current sampler are also respectively connected to the compressor and the outdoor fan for collecting the operating load of the compressor and the operating current of the outdoor fan and transmitting them to the controller; the outdoor fan is connected to the controller; the controller controls the operation of the outdoor fan according to the operating current; Select the same or different sampling strategies for each sampling of the operating current according to the operating load of the compressor and the set speed of the outdoor fan; The sampling rates of each control cycle in different sampling strategies are different.

[0007] In some specific embodiments, the controller is configured with a first load threshold and a first speed threshold, and is configured to collect the operating load of the compressor in real time through the load sampler, obtain the set speed of the outdoor fan, and compare the operating load with the first load threshold and the set speed with the first speed threshold; When the operating load of the compressor is above the first load threshold and the set speed of the outdoor fan is below the first speed threshold, adopt the sampling strategy with the maximum sampling rate.

[0008] In some specific embodiments, the controller is configured with a first sampling strategy, a second sampling strategy, a third sampling strategy, and a fourth sampling strategy with decreasing sampling rates in sequence; When the operating load is above the first load threshold and the set speed is below the first speed threshold, use the first sampling strategy to sample the operating current; When the operating load is below the first load threshold and the set speed is below the first speed threshold, use the second sampling strategy to sample the operating current; When the operating load is above the first load threshold and the set speed is above the first speed threshold, use the third sampling strategy to sample the operating current; When the operating load is below the first load threshold and the set speed is above the first speed threshold, use the fourth sampling strategy to sample the operating current.

[0009] In some specific embodiments, the controller is further configured with a second load threshold greater than the first load threshold; When the operating load is above the first load threshold and below the second load threshold, and the set speed is below the first speed threshold, use the first sampling strategy to sample the operating current; When the operating load is above the first load threshold and below the second load threshold, and the set speed is above the first speed threshold, use the third sampling strategy to sample the operating current; When the operating load is below the first load threshold and the set speed is above the first speed threshold, the fourth sampling strategy is adopted to sample the operating current.

[0010] In some specific embodiments, the controller is further configured with a second load threshold greater than the first load threshold and a second speed threshold greater than the first speed threshold; When the operating load is above the first load threshold and below the second load threshold, and the set speed is below the first speed threshold, the first sampling strategy is adopted to sample the operating current; When the operating load is above the first load threshold and below the second load threshold, and the set speed is above the first speed threshold and below the second speed threshold, the third sampling strategy is adopted to sample the operating current; When the operating load is below the first load threshold and the set speed is above the first speed threshold and below the second speed threshold, the fourth sampling strategy is adopted to sample the operating current.

[0011] In some specific embodiments, the second load threshold is the rated load of the compressor; the second speed threshold is the speed of the highest gear of the outdoor fan.

[0012] In some specific embodiments, the first load threshold accounts for a first fixed ratio value of the second load threshold; the first speed threshold accounts for a second fixed ratio value of the second speed threshold; the first fixed ratio and the second fixed ratio are numbers between 0 and 1.

[0013] In some specific embodiments, in the first sampling strategy, four samples are taken per control cycle to obtain four sampling values, and the operating current is obtained from each of the sampling values; In the second sampling strategy, three samples are taken per control cycle to obtain three sampling values, and the operating current is obtained from each of the sampling values; In the third sampling strategy, two samples are taken per control cycle to obtain two sampling values, and the operating current is obtained from each of the sampling values; In the fourth sampling strategy, one sample is taken per control cycle to obtain one sampling value, and the operating current is obtained from the sampling value.

[0014] In some specific embodiments, a deviation threshold is configured in the controller, and it is configured as: In the first sampling strategy, calculate the deviation between each of the sampling values; when each of the deviations is within the range of the deviation threshold, the operating current is equal to the average of the two sampling values after excluding the maximum and minimum values among each of the sampling values. In the second sampling strategy, calculate the deviation between each of the sampling values; when each of the deviations is within the range of the deviation threshold, the operating current is equal to the average of the two sampling values after excluding the maximum value among each of the sampling values. In the third sampling strategy, calculate the deviation of each of the sampling values; when the deviation is within the range of the deviation threshold, the operating current is equal to the average of the two sampling values. In the fourth sampling strategy, the operating current is equal to the sampling value.

[0015] In some specific embodiments, the controller is further configured with: In the first sampling strategy, the second sampling strategy, and the third sampling strategy, when the deviation is not within the range of the deviation threshold, use the operating current in the previous control cycle to control the operation of the outdoor fan.

[0016] In some specific embodiments, the load sampler adopts a torque observer, which is respectively connected to the controller and the compressor, and detects the operating torque of the compressor to characterize the operating load of the compressor.

[0017] The air conditioner of the present invention selects sampling strategies with different sampling rates for sampling the operating current according to the different operating loads of the compressors collected by the load sampler and the set speed of the outdoor fan; by using different sampling rates in each sampling strategy to solve the problem of different sampling accuracies of the resistance current when the operating loads are different and the set speeds are different, and when the sampling accuracy is not high, adopt a sampling strategy with a higher sampling rate to improve the accuracy of the obtained operating current, and further solve the problem of out-of-step control of the outdoor fan caused by inaccurate operating current, and improve the accuracy and reliability of the control of the outdoor fan.

[0018] After reading the specific embodiments of the present invention in conjunction with the accompanying drawings, other features and advantages of the present invention will become clearer. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic diagram of the circuit connection of an air conditioner according to an embodiment; Figure 2 Schematic diagram of the outdoor fan control system of an air conditioner according to an embodiment; Figure 3 Schematic diagram of a partial circuit connection including a current sampler according to an embodiment; Figure 4 Schematic diagram of the control flow of an air conditioner according to an embodiment; Figure 5 Schematic diagram of the control flow of an air conditioner according to an embodiment; Figure 6 Schematic diagram of the control flow of an air conditioner according to an embodiment; Figure 7 Schematic diagram of the control flow of an air conditioner according to an embodiment; Figure 8 Schematic diagram of the control flow of an air conditioner according to an embodiment for the first sampling strategy; Figure 9 Schematic diagram of the control flow of an air conditioner according to an embodiment for the second sampling strategy; Figure 10 Schematic diagram of the control flow of an air conditioner according to an embodiment for the third sampling strategy; Figure 11 Schematic diagram of the control flow of an air conditioner according to an embodiment for the fourth sampling strategy. Reference numerals

[0021] D1 - D6, rectifier diodes; T1 - T6, first group of control switches; S1 - S6, second group of control switches; COM, compressor; FAN, outdoor fan; R1 - R2, sampling resistors. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0023] In the description of the present application, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0024] The terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0025] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0027] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0028]

Principle of Air Conditioner

[0029] The low-temperature and low-pressure refrigerant enters the compressor, and the compressor compresses it into a refrigerant gas in a high-temperature and high-pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0030] The expansion valve expands the high-temperature and high-pressure liquid-phase refrigerant formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by using the latent heat of evaporation of the refrigerant for heat exchange with the material to be cooled. Throughout the cycle, the air conditioner can adjust the temperature of the indoor space.

[0031] The outdoor unit of the air conditioner refers to the part of the refrigeration cycle including the compressor and the outdoor heat exchanger. The indoor unit of the air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in the indoor unit or the outdoor unit.

[0032] The indoor heat exchanger and the outdoor heat exchanger are used as condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner serves as a heater in the heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner serves as a cooler in the cooling mode.

[0033]

The Present Invention

[0034] The outdoor unit further includes a controller and a load sampler and a current sampler respectively connected to the controller; the load sampler and the current sampler are also respectively connected to the compressor COM and the outdoor fan FAN correspondingly, and are respectively used for collecting the operating load of the compressor COM and the operating current of the outdoor fan FAN and transmitting them to the controller S1.

[0035] The outdoor fan FAN is connected to the controller and is controlled by the controller to operate. Specifically, the controller controls the acquisition strategy of the current sampler to collect the operating current of the outdoor fan FAN according to the two parameters of the received operating load and the set speed of the outdoor fan FAN, and obtains the real-time operating current according to the sampling value collected by the above acquisition strategy for the current closed-loop control S2 of the outdoor fan FAN.

[0036] Multiple different acquisition strategies are set in the controller, and each acquisition strategy has a different sampling rate. The sampling rate is the number of samplings in each control cycle.

[0037] The controller selects the same or different sampling strategies for the sampling of the operating current in each control cycle according to the received operating load and the set speed of the outdoor fan FAN.

[0038] The air conditioner of the present invention selects sampling strategies with different sampling rates for the sampling of the operating current according to the different operating loads of the compressor COM collected by the load sampler and the set speed of the outdoor fan FAN; solves the problem of different sampling accuracies of the resistance current when the operating loads are different and the set speeds are different through the different sampling rates in each sampling strategy, and uses a sampling strategy with a higher sampling rate when the sampling accuracy is not high to improve the accuracy of the obtained operating current, and further solves the problem of out-of-step control of the outdoor fan FAN caused by inaccurate operating current, and improves the accuracy and reliability of the control of the outdoor fan FAN.

[0039] The following specifically describes the specific method and principle for controlling the operation of the outdoor fan FAN of the air conditioner according to the present invention through specific embodiments.

[0040] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 5 , the controller is configured with a first load threshold and a first speed threshold for determining whether the operation state of the compressor COM is heavy-load operation and whether the outdoor fan FAN is in low-speed operation.

[0041] The controller is also configured to receive in real time the operating load sampled by the load sampler and the set speed S1 of the outdoor fan FAN, compare the obtained operating load in real time with the first load threshold, and compare the set speed with the first speed threshold to determine whether the operating load reaches and / or exceeds the first load threshold and whether the set speed reaches and / or is lower than the first speed threshold S21.

[0042] And when the operating load of the compressor COM reaches and / or exceeds the first load threshold S22, it is determined that the compressor COM is in a heavy-load operation state; when the set speed reaches and / or is less than the first speed threshold, it is determined that the outdoor fan FAN is in the low-speed operation stage S22. When it is determined that the compressor COM is in a heavy load and the outdoor fan FAN is in low-speed operation, the controller selects a sampling strategy with a higher sampling rate to sample the operating current, obtains a plurality of sampling values, and obtains the operating current from each sampling value S23.

[0043] The air conditioner of this embodiment samples the operating current of the outdoor fan FAN by selecting a sampling strategy with a high sampling rate when the compressor COM is in a heavy load and the outdoor fan FAN is in a low-speed state, obtains a plurality of sampling values, and obtains the operating current from each sampling value. By increasing the number of sampling values, the influence of the heavy load of the compressor COM on the resistance current sampling when the outdoor fan FAN is in low speed is reduced, the accuracy of the resistance current sampling is improved, and further the accuracy and reliability of controlling the operation of the outdoor fan FAN by the operating current are improved, and the control out-of-step of the outdoor fan FAN is reduced.

[0044] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 6, a first load threshold and a first speed threshold are configured in the controller; a first sampling strategy, a second sampling strategy, a third sampling strategy, and a fourth sampling strategy are also configured in the controller, and their sampling rates in each control cycle decrease in sequence. That is, the number of consecutive samples of the operating current in each control cycle in the first sampling strategy is greater than the number of consecutive samples of the operating current in each control cycle in the second sampling strategy; the number of consecutive samples of the operating current in each control cycle in the second sampling strategy is greater than the number of consecutive samples of the operating current in each control cycle in the third sampling strategy; the number of consecutive samples of the operating current in each control cycle in the third sampling strategy is greater than the number of consecutive samples of the operating current in each control cycle in the fourth sampling strategy.

[0045] The controller is configured to obtain in real time the operating load collected by the load sampler and the set speed S1 of the outdoor fan FAN, compare the obtained operating load with the first load threshold and the set speed with the first speed threshold S21, and adopt different sampling strategies according to the comparison results.

[0046] Specifically, when the controller determines that the operating load reaches the first load threshold and / or is above the first load threshold, and the set speed reaches the first speed threshold and / or is below the first speed threshold S22, the controller controls the current sampler to sample using the first sampling strategy S23.

[0047] When the controller determines that the operating load reaches the first load threshold and / or the operating load is below the first load threshold, and the set speed reaches the first speed threshold and / or the set speed is below the first speed threshold S24, the controller controls the current sampler to sample using the second sampling strategy S25.

[0048] When the controller determines that the operating load reaches the first load threshold and / or the operating load is above the first load threshold, and the set speed reaches the first speed threshold and / or the set speed is above the first speed threshold S26, the controller controls the current sampler to sample using the third sampling strategy S27.

[0049] When the controller determines that the operating load reaches the first load threshold and / or the operating load is below the first load threshold, and the set speed reaches the first speed threshold and / or the set speed is above the first speed threshold, the controller controls the current sampler to sample using the fourth sampling strategy S28.

[0050] Among them, the state where the operating load is equal to the first load threshold and the set speed is equal to the first speed threshold can adopt the first sampling strategy or the second sampling strategy or the third sampling strategy or the fourth sampling strategy, which is set according to needs.

[0051] If the control efficiency of the controller is emphasized, the third sampling strategy or the fourth sampling strategy can be adopted; if the accuracy of sampling is more emphasized, the first sampling strategy or the second sampling strategy can be adopted.

[0052] The air conditioner of this embodiment sets multiple sampling strategies with different sampling rates according to the different degrees of influence of the operating load and the set speed on the sampling of the resistance current, and divides them into multiple regions corresponding to different sampling strategies according to different operating loads, set speeds, and the set first load threshold and first speed threshold, so as to refine the sampling control, further improve the accuracy of the resistance current sampling, reduce the risk of out-of-step, and further improve the reliability of the outdoor fan FAN control.

[0053] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 , the controller is configured with a first load threshold, a second load threshold greater than the first load threshold, and a first speed threshold.

[0054] The controller is configured with a first sampling strategy, a second sampling strategy, a third sampling strategy, and a fourth sampling strategy with gradually decreasing sampling rates.

[0055] The controller is configured to obtain the operating load of the compressor COM and the set speed S1 of the outdoor fan FAN in real time, and compare the operating load with the first load threshold and the second load threshold, and the set speed with the first speed threshold.

[0056] When the operating load reaches the first load threshold and / or is above the first load threshold and below the second load threshold, and the set speed reaches the first speed threshold and / or is below the first speed threshold S220, the first sampling strategy is used to sample the operating current S23.

[0057] When the operating load reaches the first load threshold and / or is below the first load threshold, and the set speed reaches the first speed threshold and / or is below the first speed threshold S24, the second sampling strategy is used to sample the operating current S25.

[0058] When the operating load reaches the first load threshold and / or is above the first load threshold and below the second load threshold, and the set speed reaches the first speed threshold and / or is above the first speed threshold, the third sampling strategy is used to sample the operating current S27.

[0059] When the operating load reaches the first load threshold and / or is below the first load threshold, and the set speed reaches the first speed threshold and / or is above the first speed threshold, the fourth sampling strategy is used to sample the operating current S28.

[0060] By setting a high threshold for the operating load, the air conditioner in this embodiment defines the control area of the operating load and the set speed, avoiding control anomalies that may occur when the extreme situation where the operating load exceeds the second load threshold still performs the above sampling control or the superimposed control of the above sampling control and the conventional control, and improving the reliability of the operation control of the outdoor fan FAN.

[0061] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 ,the controller is configured with a first load threshold and a second load threshold greater than the first load threshold, a first speed threshold and a second speed threshold greater than the first speed threshold.

[0062] The controller is configured with a first sampling strategy, a second sampling strategy, a third sampling strategy, and a fourth sampling strategy with sequentially decreasing sampling rates.

[0063] The controller is configured to obtain the operating load of the compressor COM and the set speed S1 of the outdoor fan FAN in real time, and compare the operating load with the first load threshold and the second load threshold, and the set speed with the first speed threshold and the second speed threshold S210.

[0064] When the operating load reaches the first load threshold and / or is above the first load threshold and below the second load threshold, and the set speed reaches the first speed threshold and / or is below the first speed threshold S220, the first sampling strategy is used to sample the operating current S23.

[0065] When the operating load reaches the first load threshold and / or is below the first load threshold, and the set speed reaches the first speed threshold and / or is below the first speed threshold S24, the second sampling strategy is used to sample the operating current S25.

[0066] When the operating load reaches the first load threshold and / or is above the first load threshold and below the second load threshold, and the set speed reaches the first speed threshold and / or is above the first speed threshold and below the second speed threshold S260, the third sampling strategy is used to sample the operating current S27.

[0067] When the operating load reaches the first load threshold and / or is below the first load threshold, and the set speed reaches the first speed threshold and / or is above the first speed threshold and below the second speed threshold, the fourth sampling strategy is used to sample the operating current S28.

[0068] The air conditioner in this embodiment defines the control regions of the operating load and the set speed by setting high - level thresholds for the operating load and the set speed respectively, avoiding control anomalies that may occur when the operating load exceeds the second load threshold and / or the set speed exceeds the second speed threshold, and still performing the above - mentioned sampling control or the superimposed control of the above - mentioned sampling control and the conventional control, thereby improving the reliability of the operation control of the outdoor fan FAN.

[0069] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 , the second load threshold is set to the rated load of the compressor COM; the second speed threshold is set to the speed of the highest gear of the outdoor fan FAN.

[0070] In some specific embodiments, the first load threshold accounts for a first fixed ratio value of the second load threshold. This facilitates the migration of the control program among air conditioners of different models and improves the R & D efficiency.

[0071] In some specific embodiments, the first speed threshold accounts for a second fixed ratio value of the second speed threshold, which facilitates the migration of the control program among air conditioners of different models and improves the R & D efficiency.

[0072] Of course, the first speed threshold and the first load threshold can also be set according to the influence degree of different compressor COM loads on the resistance - current sampling of the outdoor fan FAN at different set speeds of the outdoor fan FAN.

[0073] In some specific embodiments, the first fixed ratio value and the second fixed ratio value are numbers between 0 and 1.

[0074] In some specific embodiments, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10, the controller is configured to, when executing the first sampling strategy, continuously sample four times within each control cycle to obtain four sampling values, and obtain the operating current from the above four sampling values; when executing the second sampling strategy, continuously sample three times within each control cycle to obtain three sampling values, and obtain the operating current from the above three sampling values; when executing the third sampling strategy, continuously sample two times within each control cycle to obtain two sampling values, and obtain the operating current from the above two sampling values; when executing the fourth sampling strategy, perform one sampling within each control cycle to obtain one sampling value, and obtain the operating current from this sampling value.

[0075] In some specific embodiments, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 , the controller is configured with a deviation threshold and is configured to: When executing the first sampling strategy, continuously sample four times within each control cycle to obtain four sampling values; calculate the deviations between the sampling values; compare each deviation with the deviation threshold. If all deviations are within the range required by the deviation threshold, the operating current used to control the operation of the outdoor fan FAN is updated by taking the average of the remaining two sampling values after excluding the maximum and minimum values of each sampling value, and the updated operating current is used for the operation control of the outdoor fan FAN in this control cycle. If any one or more of the deviations are not within the range of the deviation threshold, the operating current used to control the operation of the outdoor fan FAN is not updated, and the operating current value of the previous control cycle is used to continue the control of this control cycle.

[0076] When executing the second sampling strategy, continuously sample three times within each control cycle to obtain three sampling values; calculate the deviations between the sampling values; compare each deviation with the deviation threshold. If all deviations are within the range of the deviation threshold, the operating current used to control the operation of the outdoor fan FAN is updated and replaced by the average of the remaining two sampling values after excluding the maximum value of each sampling value, and is used for the operation control of the outdoor fan FAN in this control cycle. If any one or more of the deviations are not within the range of the deviation threshold, the operating current used to control the operation of the outdoor fan FAN is not updated, and the operating current of the previous control cycle is used to continue the control of this control cycle.

[0077] When implementing the third sampling strategy, two consecutive samplings are performed within each control period to obtain two sampling values; the deviation between the two samplings is calculated and compared with the deviation threshold. If the deviations are within the range of the deviation threshold, the operating current used to control the operation of the outdoor fan FAN is replaced and updated with the average value of the two sampling values for the operation control of the outdoor fan FAN in this control period. If the deviation is not within the deviation threshold range, the operating current used to control the operation of the outdoor fan FAN is not updated, and the operating current of the previous control period is used to continue the control of this control period.

[0078] When implementing the fourth sampling strategy, one sampling is performed within each control period to obtain one sampling value, which is used to update the operating current, and the operating current is used for the control of this control period.

[0079] The air conditioner of this embodiment ensures the authenticity of the sampling data and improves the practicability of the operating current used for the operation control of the outdoor fan by superimposing deviation evaluation, extreme value filtering, and average value filtering on each sampling value in the first sampling strategy and the second sampling strategy to remove interference terms. In the third sampling strategy, deviation evaluation and average value filtering are performed on each sampling value to improve the authenticity of the sampling data and the practicability of the operating current used for the operation control of the outdoor fan.

[0080] In some specific embodiments, the load sampler uses a torque observation sensor, which is respectively connected to the controller and the compressor COM, and is used to detect the operating torque of the compressor COM to characterize the operating load of the compressor COM.

[0081] In some specific embodiments, with reference to Figure 3 , the current sampler adopts the two-sampling resistor R1-R2 current sampling method.

[0082] However, the current sampler can also adopt the three-sampling resistor current sampling or the one-sampling resistor current sampling.

[0083] In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples.

[0084] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An air conditioner, comprising: Outdoor fan, compressor; the outdoor fan and the compressor are connected in a common bus; Characterized in that it further includes a controller and a load sampler and a current sampler respectively connected to the controller; the load sampler and the current sampler are also respectively connected to the compressor and the outdoor fan correspondingly, for collecting the operating load of the compressor and the operating current of the outdoor fan and transmitting them to the controller; the outdoor fan is connected to the controller; the controller controls the operation of the outdoor fan according to the operating current; Select the same or different sampling strategies for each sampling of the operating current according to the operating load of the compressor and the set speed of the outdoor fan; The sampling rates of each control cycle in different sampling strategies are different.

2. The air conditioner according to claim 1, characterized in that The controller is configured with a first load threshold and a first speed threshold, and is configured to collect the operating load of the compressor in real time through the load sampler, obtain the set speed of the outdoor fan, and compare the operating load with the first load threshold and the set speed with the first speed threshold; When the operating load of the compressor is above the first load threshold and the set speed of the outdoor fan is below the first speed threshold, adopt the sampling strategy with the maximum sampling rate.

3. The air conditioner according to claim 2, wherein The controller is configured with a first sampling strategy, a second sampling strategy, a third sampling strategy, and a fourth sampling strategy with gradually decreasing sampling rates; When the operating load is above the first load threshold and the set speed is below the first speed threshold, adopt the first sampling strategy to sample the operating current; When the operating load is below the first load threshold and the set speed is below the first speed threshold, adopt the second sampling strategy to sample the operating current; When the operating load is above the first load threshold and the set speed is above the first speed threshold, adopt the third sampling strategy to sample the operating current; ​ 4. The air conditioner according to claim 3, wherein, ​ ​ ​ ​ 5. The air conditioner according to claim 4, characterized in that The second load threshold is the rated load of the compressor; the second rotational speed threshold is the rotational speed of the highest gear of the outdoor fan.

6. The air conditioner according to claim 5, characterized in that, The first load threshold accounts for a first fixed proportional value of the second load threshold; the first rotational speed threshold accounts for a second fixed proportional value of the second rotational speed threshold; the first fixed proportion and the second fixed proportion are numbers between 0 and 1.

7. The air conditioner according to any one of claims 3 to 6, characterized in that, In the first sampling strategy, four samplings are performed within each control period to obtain four sampling values, and the operating current is obtained from each of the sampling values. In the second sampling strategy, three samplings are performed within each control period to obtain three sampling values, and the operating current is obtained from each of the sampling values. In the third sampling strategy, two samplings are performed within each control period to obtain two sampling values, and the operating current is obtained from each of the sampling values. In the fourth sampling strategy, one sampling is performed within each control period to obtain one sampling value, and the operating current is obtained from the sampling value.

8. The air conditioner according to claim 7, characterized in that, A deviation threshold is configured in the controller, and it is configured as follows: In the first sampling strategy, calculate the deviation between each of the sampling values; when each of the deviations is within the range of the deviation threshold, the operating current is equal to the average value of the two sampling values after excluding the maximum value and the minimum value among each of the sampling values. In the second sampling strategy, calculate the deviation between each of the sampling values; when each of the deviations is within the range of the deviation threshold, the operating current is equal to the average value of the two sampling values after excluding the maximum value among each of the sampling values. In the third sampling strategy, calculate the deviation of each of the sampling values; when the deviation is within the range of the deviation threshold, the operating current is equal to the average value of the two sampling values. In the fourth sampling strategy, the operating current is equal to the sampling value.

9. The air conditioner according to claim 8, wherein The controller is further configured with: In the first sampling strategy, the second sampling strategy, and the third sampling strategy, when the deviation is not within the range of the deviation threshold, use the operating current in the previous control period to control the operation of the outdoor fan.

10. The air conditioner according to claim 9, characterized in that, The load sampler uses a torque observer, which is respectively connected to the controller and the compressor to detect the operating torque of the compressor and characterize the operating load of the compressor.

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