Air conditioning unit

Abstract

The invention discloses an air conditioning unit which comprises an outdoor unit which comprises a compressor, an outdoor heat exchanger and an outdoor fan. The indoor unit comprises an indoor heat exchanger and an indoor fan; the controller is configured to obtain the initial duty ratio of the outdoor fan; the real-time duty ratio of the outdoor fan is obtained; when the real-time duty ratio of the outdoor fan exceeds the initial duty ratio, it is judged that a defrosting entering condition is met; or / and the initial power of the outdoor fan is obtained; the real-time power of an outdoor fan is obtained; and when the real-time power of the outdoor fan exceeds the initial power, it is judged that the defrosting entering condition is met. According to the air conditioning unit, when the real-time duty ratio of the outdoor fan exceeds the initial duty ratio or / and the real-time power of the outdoor fan exceeds the initial power, it is indicated that the load of the outdoor fan suddenly changes, the outdoor heat exchanger possibly frosts, it is judged that the defrosting entering condition is met, and the defrosting entering condition is accurately judged; the technical problem that in the prior art, defrosting entering condition judgment is not accurate is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, in particular to an air conditioning unit. Background Art

[0002] As people's living standards continue to improve, installing air-conditioning units in homes, hotels and other places to improve environmental comfort has become an important choice for people to improve their comfort needs.

[0003] Whether the air-conditioning unit can accurately enter the defrost mode is also an important criterion for measuring the performance of the air-conditioning unit.

[0004] At present, most manufacturers only use the most basic time and temperature judgment to determine whether the unit has entered defrost mode, and there is no other judgment method.

[0005] The existing units only use time and heat exchanger temperature to make overall defrost judgments. This judgment method is too simple and the defrost entry conditions are not accurately judged. Summary of the invention

[0006] The present invention provides an air conditioning unit, which solves the technical problem of inaccurate judgment of defrosting entry conditions in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] The present invention provides an air conditioning unit, comprising:

[0009] The outdoor unit includes a compressor, an outdoor heat exchanger, and an outdoor fan;

[0010] An indoor unit, which includes an indoor heat exchanger and an indoor fan;

[0011] A controller configured to:

[0012] Obtaining an initial duty cycle of the outdoor fan; obtaining a real-time duty cycle of the outdoor fan; when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, determining that the defrost entry condition is met;

[0013] Or / and, obtaining the initial power of the outdoor fan; obtaining the real-time power of the outdoor fan; when the real-time power of the outdoor fan exceeds the initial power, determining that the defrost entry condition is met.

[0014] In some embodiments of the present application, the controller is further configured to:

[0015] When the real-time duty cycle of the outdoor fan exceeds fan_start_D×K1, it is determined that the defrost entry condition is met; where fan_start_D is the initial duty cycle of the outdoor fan; K1 is a constant greater than 1;

[0016] or / and,

[0017] When the real-time power of the outdoor fan exceeds fan_start_P×K2, it is determined that the defrost entry condition is met; wherein fan_start_P is the initial power of the outdoor fan; and K2 is a constant greater than 1.

[0018] In some embodiments of the present application, the controller is further configured to:

[0019] When the operating time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time duty cycle of the outdoor fan exceeds the initial duty cycle of the outdoor fan, it is determined that the defrost entry condition is met.

[0020] In some embodiments of the present application, the controller is further configured to:

[0021] When the operating time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time power of the outdoor fan exceeds the initial power of the outdoor fan, it is determined that the defrost entry condition is met.

[0022] In some embodiments of the present application, the obtaining of the initial duty cycle of the outdoor fan specifically includes:

[0023] After the compressor starts to run for a first set time, the duty cycle of the outdoor fan is obtained;

[0024] If the duty cycle is not 0, the duty cycle is the initial duty cycle of the outdoor fan;

[0025] If the duty cycle is 0, the duty cycle estimated value fan_est_D is calculated periodically;

[0026] fan_est_D=fan_D×fan(A) / fan(x);

[0027] in,

[0028] fan_D is the current duty cycle of the outdoor fan;

[0029] fan(A) is the current voltage of the outdoor fan;

[0030] fan(x) is a constant;

[0031] The average value of the estimated duty cycle values ​​calculated in m consecutive cycles is used as the initial duty cycle of the outdoor fan.

[0032] In some embodiments of the present application, the obtaining of the initial power of the outdoor fan specifically includes:

[0033] After the compressor starts to run for a first set time, the power of the outdoor fan is obtained;

[0034] If the power is not 0, the duty cycle is the initial power of the outdoor fan;

[0035] If the power is 0, the power estimation value fan_est_P is calculated periodically;

[0036] fan_est_P=fan_P×fan(A) / fan(x);

[0037] in,

[0038] fan_P is the current power of the outdoor fan;

[0039] fan(A) is the current voltage of the outdoor fan;

[0040] fan(x) is a constant;

[0041] The average value of the power estimation values ​​calculated in m consecutive cycles is used as the initial power of the outdoor fan.

[0042] In some embodiments of the present application, the controller is further configured to:

[0043] When the calculated duty cycle estimated value is 0, stop periodically calculating the duty cycle estimated value. After the second set time, recalculate the duty cycle estimated value periodically until the duty cycle estimated values ​​calculated for m consecutive periods are not equal to 0. Then calculate the average value of the m duty cycle estimated values ​​as the initial duty cycle of the outdoor fan.

[0044] In some embodiments of the present application, the controller is further configured to:

[0045] When the calculated power estimated value is 0, stop periodically calculating the power estimated value. After the second set time, recalculate the power estimated value periodically until the power estimated values ​​calculated for m consecutive periods are not equal to 0. Then calculate the average value of the m power estimated values ​​as the initial power of the outdoor fan.

[0046] In some embodiments of the present application, obtaining the real-time duty cycle of the outdoor fan specifically includes:

[0047] When the gear of the outdoor fan is set to a high gear, the duty cycle of the outdoor fan obtained in the previous cycle is compared with the estimated duty cycle value calculated in the current cycle, and the larger value is used as the real-time duty cycle of the outdoor fan in the current cycle;

[0048] When the gear of the outdoor fan is lower than the set high gear, compare the duty cycle of the outdoor fan obtained in the previous cycle with the estimated duty cycle value × K3 calculated in the current cycle, and use the larger value as the real-time duty cycle of the outdoor fan in the current cycle;

[0049] Among them, K3 is a constant, 0<K3<1.

[0050] In some embodiments of the present application, the obtaining of the real-time power of the outdoor fan specifically includes:

[0051] When the gear of the outdoor fan is set to a high gear, the power of the outdoor fan obtained in the previous cycle is compared with the power estimated value calculated in the current cycle, and the larger value is used as the real-time power of the outdoor fan in the current cycle;

[0052] When the gear of the outdoor fan is lower than the set high gear, compare the power of the outdoor fan obtained in the previous cycle with the power estimated value × K4 calculated in the current cycle, and take the larger value as the real-time power of the outdoor fan in the current cycle;

[0053] Among them, K4 is a constant, 0<K4<1.

[0054] The technical solution of the present invention has the following technical effects relative to the prior art: the air-conditioning unit of the present invention obtains the initial duty cycle of the outdoor fan; obtains the real-time duty cycle of the outdoor fan; when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, it is determined that the defrost entry condition is met; or / and, obtains the initial power of the outdoor fan; obtains the real-time power of the outdoor fan; when the real-time power of the outdoor fan exceeds the initial power, it is determined that the defrost entry condition is met. Therefore, in the air-conditioning unit of the present invention, when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, or / and, the real-time power of the outdoor fan exceeds the initial power, it indicates that the load of the outdoor fan changes suddenly and the outdoor heat exchanger may be frosted. Therefore, it is determined that the defrost entry condition is met, and the defrost entry condition is accurately judged, which improves the accuracy of the judgment of the defrost entry condition and solves the technical problem of inaccurate judgment of the defrost entry condition in the prior art.

[0055] 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 more clear. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0057] Figure 1 A flowchart of an embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0058] Figure 2 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0059] Figure 3 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0060] Figure 4 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0061] Figure 5 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0062] Figure 6 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0063] Figure 7 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0064] Figure 8 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0065] Fig. 9 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0066] Fig.10 A flowchart of another embodiment of the steps executed by the controller of the air conditioning unit of the present invention;

[0067] Fig.11 It is a timing diagram of the process of obtaining the estimated value of duty cycle or the estimated value of power;

[0068] Fig.12 It is a schematic diagram of duty cycle. DETAILED DESCRIPTION

[0069] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0070] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0071] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0073] In the present invention, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0074] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0075] The air conditioning unit performs the refrigeration cycle and heating cycle of the air conditioning unit by using a compressor, condenser, expansion valve and evaporator, and the controller performs control to realize the flow control of the refrigerant and the opening control of the expansion valve, etc. The refrigeration cycle and heating cycle include a series of processes involving compression, condensation, expansion and evaporation, and supply refrigerant to the air that has been conditioned and heat exchanged.

[0076] The compressor compresses the 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 the heat is released to the surrounding environment through the condensation process.

[0077] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid 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 utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioning unit can adjust the temperature of the indoor space.

[0078] The air conditioner outdoor unit refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the air conditioner indoor unit includes an indoor heat exchanger, and an expansion valve may be provided in the air conditioner outdoor unit or the indoor unit.

[0079] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioning unit functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioning unit functions as a cooler in a cooling mode.

[0080] The air conditioning unit of this embodiment includes an outdoor unit, an indoor unit, a controller, etc.

[0081] The outdoor unit includes a compressor, an outdoor heat exchanger, an outdoor fan, etc.

[0082] The indoor unit includes an indoor heat exchanger, an indoor fan, etc.

[0083] Controller, which controls the operation of the entire air conditioning unit.

[0084] A controller configured to:

[0085] Obtaining an initial duty cycle of the outdoor fan; obtaining a real-time duty cycle of the outdoor fan; and determining that a defrost entry condition is met when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle.

[0086] Or / and, obtaining the initial power of the outdoor fan; obtaining the real-time power of the outdoor fan; when the real-time power of the outdoor fan exceeds the initial power, determining that the defrost entry condition is met.

[0087] Duty cycle refers to the ratio of the time occupied by a pulse to the total time during a period of continuous working time.

[0088] When the real-time duty cycle of the outdoor fan is greater than or equal to the initial duty cycle, or / and the real-time power of the outdoor fan is greater than or equal to the initial power, it is determined that the defrost entry condition is met.

[0089] In some embodiments of the present application, the controller performs the following steps: Figure 1 described.

[0090] Step S11: Obtaining the initial duty cycle of the outdoor fan.

[0091] Step S12: Obtain the real-time duty cycle of the outdoor fan.

[0092] Step S13: Determine whether the real-time duty cycle of the outdoor fan exceeds the initial duty cycle of the outdoor fan.

[0093] If not, return to step S12.

[0094] If yes, step S14 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0095] When the real-time duty cycle of the outdoor fan exceeds the initial duty cycle of the outdoor fan, it indicates that the load of the outdoor fan changes suddenly and the outdoor heat exchanger may be frosted. Therefore, it is determined that the defrost entry conditions are met and the defrost mode is entered.

[0096] In some other embodiments of the present application, the controller performs the following steps: Figure 2 described.

[0097] Step S21: Obtain the initial power of the outdoor fan.

[0098] Step S22: Obtain the real-time power of the outdoor fan.

[0099] Step S23: Determine whether the real-time power of the outdoor fan exceeds the initial power of the outdoor fan.

[0100] If not, return to step S22.

[0101] If yes, step S24 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0102] When the real-time power of the outdoor fan exceeds the initial power of the outdoor fan, it indicates that the load of the outdoor fan changes suddenly and the outdoor heat exchanger may be frosted. Therefore, it is determined that the defrost entry conditions are met and the defrost mode is entered.

[0103] The air conditioning unit of this embodiment obtains the initial duty cycle of the outdoor fan; obtains the real-time duty cycle of the outdoor fan; when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, it is determined that the defrost entry condition is met; or / and, obtains the initial power of the outdoor fan; obtains the real-time power of the outdoor fan; when the real-time power of the outdoor fan exceeds the initial power, it is determined that the defrost entry condition is met. Therefore, in the air conditioning unit of this embodiment, when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, or / and, the real-time power of the outdoor fan exceeds the initial power, it indicates that the load of the outdoor fan changes suddenly and the outdoor heat exchanger may be frosted. Therefore, it is determined that the defrost entry condition is met, and the defrost entry condition is accurately judged, which improves the accuracy of the judgment of the defrost entry condition and solves the technical problem of inaccurate judgment of the defrost entry condition in the prior art.

[0104] In some other embodiments of the present application, the controller is further configured to perform the following steps: Figure 3 described.

[0105] Step S31: Obtain the initial duty cycle fan_start_D of the outdoor fan.

[0106] Step S32: Obtain the real-time duty cycle of the outdoor fan.

[0107] Step S33: Determine whether the real-time duty cycle of the outdoor fan exceeds fan_start_D×K1.

[0108] If not, return to step S32.

[0109] If yes, step S34 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0110] Therefore, in order to avoid misjudgment and improve the accuracy of defrost entry condition judgment, when the real-time duty cycle of the outdoor fan is greater than or equal to fan_start_D×K1, it is determined that the defrost entry condition is met; where fan_start_D is the initial duty cycle of the outdoor fan; K1 is a constant greater than 1.

[0111] K1 selects different constant values ​​according to different regions and air conditioner capacities.

[0112] In some other embodiments of the present application, the controller is further configured to perform the following steps: Figure 4 described.

[0113] Step S41: Obtain the initial power fan_start_P of the outdoor fan.

[0114] Step S42: Obtain the real-time power of the outdoor fan.

[0115] Step S43: Determine whether the real-time power of the outdoor fan exceeds fan_start_P×K2.

[0116] If not, return to step S42.

[0117] If yes, step S44 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0118] Therefore, in order to avoid misjudgment and improve the accuracy of defrost entry condition judgment, when the real-time power of the outdoor fan is greater than or equal to fan_start_P×K2, it is determined that the defrost entry condition is met; where fan_start_P is the initial power of the outdoor fan; K2 is a constant greater than 1.

[0119] K2 selects different constant values ​​according to different regions and air conditioner capacities.

[0120] In some other embodiments of the present application, the controller is further configured to: when the operating time of the air-conditioning unit reaches a time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time duty cycle of the outdoor fan is greater than or equal to the initial duty cycle of the outdoor fan, it is determined that the defrost entry conditions are met.

[0121] The air conditioning unit of this embodiment improves the accuracy of judging the defrost entry conditions by comprehensively considering the operating time of the air conditioning unit, the temperature of the outdoor heat exchanger coil, the real-time duty cycle of the outdoor fan, and the initial duty cycle.

[0122] Therefore, the controller is configured to perform the following steps, see Figure 5 described.

[0123] Step S51: Obtaining the initial duty cycle of the outdoor fan.

[0124] Step S52: Obtain the operating time of the air-conditioning unit and the coil temperature of the outdoor heat exchanger.

[0125] The operating time of the air conditioning unit refers to the cumulative operating time since the last defrost exit.

[0126] Step S53: Determine whether the operating time of the air-conditioning unit reaches a time threshold and the coil temperature of the outdoor heat exchanger does not exceed a temperature threshold.

[0127] If not satisfied, return to step S52.

[0128] If satisfied, execute step S54.

[0129] Step S54: Obtain the real-time duty cycle of the outdoor fan.

[0130] Step S55: Determine whether the real-time duty cycle of the outdoor fan exceeds the initial duty cycle of the outdoor fan.

[0131] If not, return to step S54.

[0132] If yes, step S56 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0133] In some other embodiments of the present application, the controller is further configured to: when the operating time of the air-conditioning unit reaches a time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time power of the outdoor fan is greater than or equal to the initial power of the outdoor fan, it is determined that the defrost entry conditions are met.

[0134] The air conditioning unit of this embodiment improves the accuracy of judging the defrost entry condition by comprehensively considering the operating time of the air conditioning unit, the temperature of the outdoor heat exchanger coil, the real-time power of the outdoor fan, and the initial power.

[0135] Therefore, the controller is configured to perform the following steps, see Figure 6 described.

[0136] Step S61: Obtain the initial power of the outdoor fan.

[0137] Step S62: Obtain the operating time of the air-conditioning unit and the coil temperature of the outdoor heat exchanger.

[0138] The operating time of the air conditioning unit refers to the cumulative operating time since the last defrost exit.

[0139] Step S63: Determine whether the operation time of the air-conditioning unit reaches a time threshold and the coil temperature of the outdoor heat exchanger does not exceed a temperature threshold.

[0140] If not satisfied, return to step S62.

[0141] If satisfied, execute step S64.

[0142] Step S64: Obtain the real-time power of the outdoor fan.

[0143] Step S65: Determine whether the real-time power of the outdoor fan exceeds the initial power of the outdoor fan.

[0144] If not, return to step S64.

[0145] If yes, step S66 is executed: it is determined that the defrost entry condition is met, and the controller controls the air-conditioning unit to enter the defrost mode.

[0146] In some embodiments of the present application, obtaining the initial duty cycle of the outdoor fan specifically includes the following steps: Figure 7 shown.

[0147] Step S71: After the compressor starts to run for a first set time (such as 1 minute), the duty cycle of the outdoor fan is obtained. Of course, the outdoor unit is in the starting state.

[0148] Step S72: Determine whether the duty cycle is 0.

[0149] If the duty cycle is not 0, step S73 is executed: the duty cycle is the initial duty cycle of the outdoor fan.

[0150] If the duty cycle is 0, step S74 is executed: periodically calculating the duty cycle estimated value fan_est_D.

[0151] The calculation formula is: fan_est_D = fan_D × fan(A) / fan(x);

[0152] in,

[0153] fan_D is the current duty cycle of the outdoor fan; it is directly output by the control board.

[0154] fan(A) is the current voltage of the outdoor fan;

[0155] fan(x) is a constant; it is the electrical parameter of the outdoor fan, a fixed value, and is related to the model of the outdoor fan.

[0156] Step S75: taking the average value of the estimated duty cycle calculated in m consecutive cycles as the initial duty cycle of the outdoor fan.

[0157] After m consecutive cycles, m duty cycle estimated values ​​are obtained, and an average value of the m duty cycle estimated values ​​is calculated as the initial duty cycle of the outdoor fan.

[0158] Wherein, m≥2, for example, m=6. The period is t1 (eg, t1=2 seconds).

[0159] Therefore, after the compressor starts to run for the first set time, the duty cycle of the outdoor fan is obtained, and if the duty cycle is 0, the duty cycle estimated value fan_est_D is periodically calculated. After m duty cycle estimated values ​​are calculated continuously, the average value is calculated as the initial duty cycle.

[0160] Each time the duty cycle estimation value fan_est_D is calculated, the current duty cycle fan_D, current voltage fan(A), and constant fan(x) of the outdoor fan must be obtained. Therefore, the duty cycle estimation value is related to the current duty cycle, current voltage, and electrical parameters. Moreover, by taking the average value of the m duty cycle estimation values ​​as the initial duty cycle, a relatively accurate initial duty cycle of the outdoor fan can be obtained.

[0161] In some embodiments of the present application, obtaining the initial power of the outdoor fan specifically includes the following steps: Figure 8 shown.

[0162] Step S81: After the compressor starts to run for a first set time (such as 1 minute), the power of the outdoor fan is obtained. Of course, the outdoor unit is in the starting state.

[0163] Step S82: Determine whether the power is 0.

[0164] If the power is not 0, step S83 is executed: the duty cycle is the initial power of the outdoor fan.

[0165] If the power is 0, step S84 is executed: periodically calculating the power estimation value fan_est_P.

[0166] The calculation formula is: fan_est_P = fan_P × fan(A) / fan(x);

[0167] in,

[0168] fan_P is the current power of the outdoor fan; it is directly output by the control board.

[0169] fan(A) is the current voltage of the outdoor fan;

[0170] fan(x) is a constant;

[0171] Step S85: taking the average value of the power estimation values ​​calculated in m consecutive cycles as the initial power of the outdoor fan.

[0172] After m consecutive cycles, m power estimation values ​​are obtained, and the average value of the m power estimation values ​​is calculated as the initial power of the outdoor fan.

[0173] Wherein, m≥2, for example, m=6. The period is t1 (eg, t1=2 seconds).

[0174] Therefore, after the compressor starts to run for the first set time, the power of the outdoor fan is obtained, and if the power is 0, the power estimation value fan_est_P is periodically calculated. After m power estimation values ​​are calculated continuously, the average value is calculated as the initial power.

[0175] Each time the power estimation value fan_est_P is calculated, the current power fan_P, current voltage fan(A) and constant fan(x) of the outdoor fan must be obtained. Therefore, the power estimation value is related to the current power, current voltage and electrical parameters. Moreover, by taking the average value of the m power estimation values ​​as the initial power, a relatively accurate initial power of the outdoor fan can be obtained.

[0176] In some embodiments of the present application, the controller is further configured to: when the calculated duty cycle estimated value is 0, stop periodically calculating the duty cycle estimated value, and after a second set time, re-periodically calculate the duty cycle estimated value until the duty cycle estimated values ​​calculated for m consecutive periods are not equal to 0, then calculate the average value of these m duty cycle estimated values ​​as the initial duty cycle of the outdoor fan.

[0177] Therefore, when the calculated duty cycle estimated value is 0, it means that the state of the outdoor fan is unstable at this time. Therefore, the duty cycle estimated value is recalculated after a delay of the second set time. When the duty cycle estimated values ​​calculated for m consecutive cycles are not equal to 0, it means that the state of the outdoor fan is stable. The average value of the m duty cycle estimated values ​​is calculated as the initial duty cycle of the outdoor fan, so as to obtain a more accurate initial duty cycle, thereby providing accuracy in judging the defrost conditions.

[0178] In some embodiments of the present application, the controller specifically performs the following steps: Fig. 9 shown.

[0179] Step S91: After the compressor starts to run for a first set time, the duty cycle of the outdoor fan is obtained.

[0180] Step S92: Determine whether the duty cycle is 0.

[0181] If the duty cycle is not 0, step S93 is executed: the duty cycle is the initial duty cycle of the outdoor fan.

[0182] If the duty cycle is 0, execute step S94.

[0183] Step S94: Periodically calculate the estimated duty ratio value fan_est_D.

[0184] fan_est_D=fan_D×fan(A) / fan(x).

[0185] Step S95: Determine whether the calculated duty ratio estimated value fan_est_D is 0.

[0186] If it is 0, execute step S96: stop periodically calculating the estimated value of the duty cycle, and re-periodically calculate the estimated value of the duty cycle after the second set time.

[0187] If it is not 0, execute step S97: record the number of times it is not 0; when the duty cycle estimated value calculated m times in succession is not equal to 0, calculate the average value of the m duty cycle estimated values ​​as the initial duty cycle of the outdoor fan.

[0188] In some embodiments of the present application, the controller is also configured to: when the calculated power estimated value is 0, stop periodically calculating the power estimated value, and after a second set time, re-periodically calculate the power estimated value until the power estimated values ​​calculated for m consecutive periods are not equal to 0, then calculate the average value of these m power estimated values ​​as the initial power of the outdoor fan.

[0189] Therefore, when the calculated power estimated value is 0, it means that the state of the outdoor fan is unstable at this time. Therefore, the power estimated value is recalculated after a delay of the second set time. When the power estimated values ​​calculated for m consecutive cycles are not equal to 0, it means that the state of the outdoor fan is stable. The average value of the m power estimated values ​​is calculated as the initial power of the outdoor fan, so as to obtain a more accurate initial power, thereby providing accuracy in judging the defrost conditions.

[0190] In some embodiments of the present application, the controller specifically performs the following steps: Fig.10 shown.

[0191] Step S101: After the compressor starts to run for a first set time, the power of the outdoor fan is obtained.

[0192] Step S102: Determine whether the power is 0.

[0193] If the power is not 0, step S103 is executed: the power is the initial power of the outdoor fan.

[0194] If the power is 0, step S104 is executed.

[0195] Step S104: periodically calculating the estimated power value fan_est_P.

[0196] fan_est_P=fan_P×fan(A) / fan(x).

[0197] Step S105: Determine whether the calculated power estimation value fan_est_P is 0.

[0198] If it is 0, execute step S106: stop periodically calculating the power estimated value, and re-calculate the power estimated value periodically after the second set time.

[0199] If it is not 0, execute step S107: record the number of times it is not 0; when the power estimated values ​​calculated m times in succession are not equal to 0, calculate the average value of the m power estimated values ​​as the initial power of the outdoor fan.

[0200] For example, see Fig.11As shown, after the compressor runs for t minutes, fan_est (duty cycle estimated value fan_est_D or power estimated value fan_est_P) is calculated with a cycle of t1 seconds; if fan_est = 0, fan_est is calculated again after t2 seconds. Until the fan_est calculated for 6 consecutive cycles is not 0, the average value of these 6 fan_est is calculated as the fan_start (initial duty cycle fan_start_D or initial power fan_start_P) of the outdoor fan.

[0201] For example,

[0202] fan_start={fan_est(n)+fan_est(n-1)+……+fan_est(n-5)} / 6.

[0203] fan_est(n) is the duty cycle estimated value or power estimated value calculated in the current cycle;

[0204] fan_est(n-1) is the duty cycle estimated value or power estimated value calculated in the first cycle before the current cycle;

[0205] fan_est(n-5) is the duty cycle estimated value or power estimated value calculated in the fifth cycle before the current cycle.

[0206] After the air-conditioning unit operates normally, the real-time duty cycle and the estimated duty cycle value of the outdoor fan are obtained periodically.

[0207] In order to improve the accuracy of the acquired real-time duty cycle of the outdoor fan, in some embodiments of the present application, acquiring the real-time duty cycle of the outdoor fan specifically includes:

[0208] (1) When the gear of the outdoor fan is set to a high gear (such as the highest gear), the duty cycle of the outdoor fan obtained in the previous cycle is compared with the estimated duty cycle value calculated in the current cycle, and the larger value is used as the real-time duty cycle of the outdoor fan in the current cycle.

[0209] (2) When the gear position of the outdoor fan is lower than the set high gear position, the duty cycle of the outdoor fan obtained in the previous cycle is compared with the duty cycle estimated value × K3 calculated in the current cycle, and the larger value is used as the real-time duty cycle of the outdoor fan in the current cycle.

[0210] Among them, K3 is a constant, 0<K3<1.

[0211] Therefore, when the outdoor fan is set at a high gear:

[0212] If fan_peak_D(n-1)≥fan_est_D(n), then fan_peak_D(n)=fan_peak_D(n-1);

[0213] If fan_peak_D(n-1)<fan_est_D(n), then fan_peak_D(n)=fan_est_D(n).

[0214] When the outdoor fan gear is lower than the set high gear:

[0215] If fan_peak_D(n-1)≥fan_est_D(n)×K3, then fan_peak_D(n)=fan_peak_D(n-1);

[0216] If fan_peak_D(n-1)<fan_est_D(n)×K3, then fan_peak_D(n)=fan_est_D(n)×K3.

[0217] For example, K3=0.98.

[0218] fan_peak_D(n) is the duty cycle of the outdoor fan in the current cycle;

[0219] fan_peak_D(n-1) is the duty cycle of the outdoor fan in the previous cycle;

[0220] fan_est_D(n) is the estimated duty cycle value calculated in the current cycle.

[0221] After the air-conditioning unit operates normally, the real-time power and power estimation value of the outdoor fan are obtained periodically.

[0222] In order to improve the accuracy of the obtained real-time power of the outdoor fan, in some embodiments of the present application, obtaining the real-time power of the outdoor fan specifically includes:

[0223] (1) When the gear of the outdoor fan is set to a high gear (such as the highest gear), the power of the outdoor fan obtained in the previous cycle is compared with the power estimated value calculated in the current cycle, and the larger value is used as the real-time power of the outdoor fan in the current cycle.

[0224] (2) When the gear of the outdoor fan is lower than the set high gear, the power of the outdoor fan obtained in the previous cycle is compared with the power estimated value × K4 calculated in the current cycle, and the larger value is used as the real-time power of the outdoor fan in the current cycle.

[0225] Among them, K4 is a constant, 0<K4<1.

[0226] Therefore, when the outdoor fan is set at a high gear:

[0227] If fan_peak_P(n-1)≥fan_est_P(n), then fan_peak_P(n)=fan_peak_P(n-1);

[0228] If fanpeak_P(n-1)<fan_est_P(n), then fan_peak_P(n)=fan_est_P(n).

[0229] When the outdoor fan gear is lower than the set high gear:

[0230] If fan_peak_P(n-1)≥fan_est_P(n)×K4, then fan_peak_P(n)=fan_peak_P(n-1);

[0231] If fan_peak_P(n-1)<fan_est_P(n)×K4, then fan_peak_P(n)=fan_est_P(n)×K3.

[0232] For example, K4=0.98.

[0233] fan_peak_P(n) is the power of the outdoor fan in the current cycle;

[0234] fan_peak_P(n-1) is the power of the outdoor fan in the previous cycle;

[0235] fan_est_P(n) is the estimated power value calculated in the current cycle.

[0236] In some embodiments of the present application, when the operation time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, it is determined whether the following formula is satisfied. When the following formula is satisfied, it is determined that the defrosting condition is satisfied:

[0237] max(fan_peak_D(n)-fan_start_D×K1)≥0;

[0238] like Fig.12 As shown, it is a schematic diagram of the duty cycle, fan_peak_D(n) is the real-time duty cycle, and the real-time duty cycle may change. Therefore, as long as the real-time duty cycle is greater than or equal to fan_start_D×K1, it is determined that the defrost entry condition is met.

[0239] In some embodiments of the present application, when the operation time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, it is determined whether the following formula is satisfied. When the following formula is satisfied, it is determined that the defrosting condition is satisfied:

[0240] max(fan_peak_P(n)-fan_start_P×K2)≥0;

[0241] fan_peak_P(n) is the real-time power, which may change. Therefore, as long as the real-time power is greater than or equal to fan_start_P×K2, it is determined that the defrost entry condition is met.

[0242] In some embodiments of the present application, when power is first turned on or when defrosting is completed, the initial duty cycle of the outdoor fan is 0, and the initial power of the outdoor fan is 0.

[0243] In some embodiments of the present application, when any of the following conditions is met, the duty cycle estimated value and the power estimated value are 0:

[0244] The fan gear changes within x minutes; the fan is in shutdown control; the fan is started within y minutes.

[0245] In some embodiments of the present application, when any of the following conditions is met, the real-time duty cycle of the outdoor fan is 0:

[0246] When powered on for the first time; when defrosting ends; when the compressor stops for more than Z minutes; when the outdoor unit is powered off; when the fan_start_D value is updated.

[0247] In some embodiments of the present application, when any of the following conditions is met, the real-time power of the outdoor fan is 0:

[0248] When powered on for the first time; when defrosting ends; when the compressor stops for more than Z minutes; when the outdoor unit is powered off; when the fan_start_P value is updated.

[0249] The air conditioning unit of this embodiment accurately determines whether the unit is defrosting through the parameters of the outdoor fan. On the basis of the original running time and temperature determination, a new determination method and formula for the outdoor fan output ratio is added; the output ratio of the outdoor fan is used to indirectly determine whether the unit has reached the defrosting condition.

[0250] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0251] The above are only specific embodiments 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 a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An air conditioning unit, characterized in that: include: An outdoor unit, which includes a compressor, an outdoor heat exchanger, and an outdoor fan; An indoor unit, which includes an indoor heat exchanger and an indoor fan; A controller configured to: Get the initial duty cycle of the outdoor fan; Obtaining a real-time duty cycle of the outdoor fan; when the real-time duty cycle of the outdoor fan exceeds the initial duty cycle, determining that the defrost entry condition is met; or / and, obtaining the initial power of the outdoor fan; The real-time power of the outdoor fan is obtained; when the real-time power of the outdoor fan exceeds the initial power, it is determined that the defrost entry condition is met.

2. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the real-time duty cycle of the outdoor fan exceeds fan_start_D×K1, it is determined that the defrost entry condition is met; where fan_start_D is the initial duty cycle of the outdoor fan; K1 is a constant greater than 1; or / and, When the real-time power of the outdoor fan exceeds fan_start_P×K2, it is determined that the defrost entry condition is met; wherein fan_start_P is the initial power of the outdoor fan; and K2 is a constant greater than 1.

3. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the operating time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time duty cycle of the outdoor fan exceeds the initial duty cycle of the outdoor fan, it is determined that the defrost entry condition is met.

4. The air conditioning unit according to claim 1, characterized in that: The controller is also configured to: When the operating time of the air-conditioning unit reaches the time threshold and the coil temperature of the outdoor heat exchanger does not exceed the temperature threshold, if the real-time power of the outdoor fan exceeds the initial power of the outdoor fan, it is determined that the defrost entry condition is met.

5. The air conditioning unit according to claim 1, characterized in that: The obtaining of the initial duty cycle of the outdoor fan specifically includes: After the compressor starts to run for a first set time, the duty cycle of the outdoor fan is obtained; If the duty cycle is not 0, the duty cycle is the initial duty cycle of the outdoor fan; If the duty cycle is 0, the duty cycle estimated value fan_est_D is calculated periodically; fan_est_D=fan_D×fan(A) / fan(x); in, fan_D is the current duty cycle of the outdoor fan; fan(A) is the current voltage of the outdoor fan; fan(x) is a constant; The average value of the estimated duty cycle values ​​calculated in m consecutive cycles is used as the initial duty cycle of the outdoor fan.

6. The air conditioning unit according to claim 1, characterized in that: The obtaining of the initial power of the outdoor fan specifically includes: After the compressor starts to run for a first set time, the power of the outdoor fan is obtained; If the power is not 0, the duty cycle is the initial power of the outdoor fan; If the power is 0, the power estimation value fan_est_P is calculated periodically; fan_est_P=fan_P×fan(A) / fan(x); in, fan_P is the current power of the outdoor fan; fan(A) is the current voltage of the outdoor fan; fan(x) is a constant; The average value of the power estimation values ​​calculated in m consecutive cycles is used as the initial power of the outdoor fan.

7. The air conditioning unit according to claim 5, characterized in that: The controller is also configured to: When the calculated duty cycle estimated value is 0, stop periodically calculating the duty cycle estimated value. After the second set time, recalculate the duty cycle estimated value periodically until the duty cycle estimated values ​​calculated for m consecutive periods are not equal to 0. Then calculate the average value of the m duty cycle estimated values ​​as the initial duty cycle of the outdoor fan.

8. The air conditioning unit according to claim 6, characterized in that: The controller is also configured to: When the calculated power estimated value is 0, stop periodically calculating the power estimated value. After the second set time, recalculate the power estimated value periodically until the power estimated values ​​calculated for m consecutive periods are not equal to 0. Then calculate the average value of the m power estimated values ​​as the initial power of the outdoor fan.

9. The air conditioning unit according to claim 5, characterized in that: The obtaining of the real-time duty cycle of the outdoor fan specifically includes: When the gear of the outdoor fan is set to a high gear, the duty cycle of the outdoor fan obtained in the previous cycle is compared with the estimated duty cycle value calculated in the current cycle, and the larger value is used as the real-time duty cycle of the outdoor fan in the current cycle; When the gear of the outdoor fan is lower than the set high gear, compare the duty cycle of the outdoor fan obtained in the previous cycle with the estimated duty cycle value × K3 calculated in the current cycle, and use the larger value as the real-time duty cycle of the outdoor fan in the current cycle; Among them, K3 is a constant, 0 <K3<1。 10. The air conditioning unit according to claim 6, characterized in that: The obtaining of the real-time power of the outdoor fan specifically includes: When the gear of the outdoor fan is set to a high gear, the power of the outdoor fan obtained in the previous cycle is compared with the power estimated value calculated in the current cycle, and the larger value is used as the real-time power of the outdoor fan in the current cycle; When the gear of the outdoor fan is lower than the set high gear, compare the power of the outdoor fan obtained in the previous cycle with the power estimated value × K4 calculated in the current cycle, and take the larger value as the real-time power of the outdoor fan in the current cycle; Among them, K4 is a constant, 0 <K4<1。

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